Merge tag 'usb-for-v3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next

Felipe writes:

usb: changes for v3.18 merge window

Quite big pull request this time. Audio and UVC gadgets
can now be used with our configfs-based binding. We have
three PHY drivers being removed because a new one has been
added using new PHY framework.

Gadget framework got a new ->reset callback preparing for
some other changes to come on next merge window.

A few new drivers came in as well; among those we have a
new UDC driver from Xilinx and two new glue layers for
DWC3 (ST and Qualcomm).

DWC3 also learned about tracepoints which will help debugging
quite a bit.

Other than that, a big series of non-critical fixes and
cleanups.

All patches have been on linux-next for quite a bit of time
and I boot tested these changes on platforms I have access
to and work with mainline.

Signed-of-by: Felipe Balbi <[e-mail]>

Documentation/ABI/testing/configfs-usb-gadget-uac1

···
+What:		/config/usb-gadget/gadget/functions/uac1.name
+Date:		Sep 2014
+KernelVersion:	3.18
+Description:
+		The attributes:
+
+		audio_buf_size - audio buffer size
+		fn_cap - capture pcm device file name
+		fn_cntl - control device file name
+		fn_play - playback pcm device file name
+		req_buf_size - ISO OUT endpoint request buffer size
+		req_count - ISO OUT endpoint request count

Documentation/ABI/testing/configfs-usb-gadget-uac2

···
+What:		/config/usb-gadget/gadget/functions/uac2.name
+Date:		Sep 2014
+KernelVersion:	3.18
+Description:
+		The attributes:
+
+		c_chmask - capture channel mask
+		c_srate - capture sampling rate
+		c_ssize - capture sample size (bytes)
+		p_chmask - playback channel mask
+		p_srate - playback sampling rate
+		p_ssize - playback sample size (bytes)

Documentation/devicetree/bindings/phy/qcom-dwc3-usb-phy.txt

···
+Qualcomm DWC3 HS AND SS PHY CONTROLLER
+--------------------------------------
+
+DWC3 PHY nodes are defined to describe on-chip Synopsis Physical layer
+controllers.  Each DWC3 PHY controller should have its own node.
+
+Required properties:
+- compatible: should contain one of the following:
+	- "qcom,dwc3-hs-usb-phy" for High Speed Synopsis PHY controller
+	- "qcom,dwc3-ss-usb-phy" for Super Speed Synopsis PHY controller
+- reg: offset and length of the DWC3 PHY controller register set
+- #phy-cells: must be zero
+- clocks: a list of phandles and clock-specifier pairs, one for each entry in
+  clock-names.
+- clock-names: Should contain "ref" for the PHY reference clock
+
+Optional clocks:
+  "xo"		External reference clock
+
+Example:
+		phy@100f8800 {
+			compatible = "qcom,dwc3-hs-usb-phy";
+			reg = <0x100f8800 0x30>;
+			clocks = <&gcc USB30_0_UTMI_CLK>;
+			clock-names = "ref";
+			#phy-cells = <0>;
+
+			status = "ok";
+		};
+
+		phy@100f8830 {
+			compatible = "qcom,dwc3-ss-usb-phy";
+			reg = <0x100f8830 0x30>;
+			clocks = <&gcc USB30_0_MASTER_CLK>;
+			clock-names = "ref";
+			#phy-cells = <0>;
+
+			status = "ok";
+		};

Documentation/devicetree/bindings/usb/dwc3-st.txt

···
+ST DWC3 glue logic
+
+This file documents the parameters for the dwc3-st driver.
+This driver controls the glue logic used to configure the dwc3 core on
+STiH407 based platforms.
+
+Required properties:
+ - compatible	: must be "st,stih407-dwc3"
+ - reg		: glue logic base address and USB syscfg ctrl register offset
+ - reg-names	: should be "reg-glue" and "syscfg-reg"
+ - st,syscon	: should be phandle to system configuration node which
+		  encompasses the glue registers
+ - resets	: list of phandle and reset specifier pairs. There should be two entries, one
+		  for the powerdown and softreset lines of the usb3 IP
+ - reset-names	: list of reset signal names. Names should be "powerdown" and "softreset"
+See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt
+See: Documentation/devicetree/bindings/reset/reset.txt
+
+ - #address-cells, #size-cells : should be '1' if the device has sub-nodes
+   with 'reg' property
+
+ - pinctl-names	: A pinctrl state named "default" must be defined
+See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
+
+ - pinctrl-0	: Pin control group
+See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
+
+ - ranges	: allows valid 1:1 translation between child's address space and
+		  parent's address space
+
+Sub-nodes:
+The dwc3 core should be added as subnode to ST DWC3 glue as shown in the
+example below. The DT binding details of dwc3 can be found in:
+Documentation/devicetree/bindings/usb/dwc3.txt
+
+NB: The dr_mode property described in [1] is NOT optional for this driver, as the default value
+is "otg", which isn't supported by this SoC. Valid dr_mode values for dwc3-st are either "host"
+or "device".
+
+[1] Documentation/devicetree/bindings/usb/generic.txt
+
+Example:
+
+st_dwc3: dwc3@8f94000 {
+	status		= "disabled";
+	compatible	= "st,stih407-dwc3";
+	reg		= <0x08f94000 0x1000>, <0x110 0x4>;
+	reg-names	= "reg-glue", "syscfg-reg";
+	st,syscfg	= <&syscfg_core>;
+	resets		= <&powerdown STIH407_USB3_POWERDOWN>,
+			  <&softreset STIH407_MIPHY2_SOFTRESET>;
+	reset-names	= "powerdown",
+			  "softreset";
+	#address-cells	= <1>;
+	#size-cells	= <1>;
+	pinctrl-names	= "default";
+	pinctrl-0	= <&pinctrl_usb3>;
+	ranges;
+
+	dwc3: dwc3@9900000 {
+		compatible	= "snps,dwc3";
+		reg		= <0x09900000 0x100000>;
+		interrupts	= <GIC_SPI 155 IRQ_TYPE_NONE>;
+		dr_mode		= "host";
+		phys-names      = "usb2-phy", "usb3-phy";
+		phys            = <&usb2_picophy2>, <&phy_port2 MIPHY_TYPE_USB>;
+	};
+};

Documentation/devicetree/bindings/usb/mxs-phy.txt

···
 	* "fsl,imx23-usbphy" for imx23 and imx28
 	* "fsl,imx6q-usbphy" for imx6dq and imx6dl
 	* "fsl,imx6sl-usbphy" for imx6sl
+	* "fsl,vf610-usbphy" for Vybrid vf610
 	* "fsl,imx6sx-usbphy" for imx6sx
   "fsl,imx23-usbphy" is still a fallback for other strings
 - reg: Should contain registers location and length

Documentation/devicetree/bindings/usb/qcom,dwc3.txt

···
+Qualcomm SuperSpeed DWC3 USB SoC controller
+
+Required properties:
+- compatible:	should contain "qcom,dwc3"
+- clocks:		A list of phandle + clock-specifier pairs for the
+				clocks listed in clock-names
+- clock-names:	Should contain the following:
+  "core"		Master/Core clock, have to be >= 125 MHz for SS
+				operation and >= 60MHz for HS operation
+
+Optional clocks:
+  "iface"		System bus AXI clock.  Not present on all platforms
+  "sleep"		Sleep clock, used when USB3 core goes into low
+				power mode (U3).
+
+Required child node:
+A child node must exist to represent the core DWC3 IP block. The name of
+the node is not important. The content of the node is defined in dwc3.txt.
+
+Phy documentation is provided in the following places:
+Documentation/devicetree/bindings/phy/qcom,dwc3-usb-phy.txt
+
+Example device nodes:
+
+		hs_phy: phy@100f8800 {
+			compatible = "qcom,dwc3-hs-usb-phy";
+			reg = <0x100f8800 0x30>;
+			clocks = <&gcc USB30_0_UTMI_CLK>;
+			clock-names = "ref";
+			#phy-cells = <0>;
+
+			status = "ok";
+		};
+
+		ss_phy: phy@100f8830 {
+			compatible = "qcom,dwc3-ss-usb-phy";
+			reg = <0x100f8830 0x30>;
+			clocks = <&gcc USB30_0_MASTER_CLK>;
+			clock-names = "ref";
+			#phy-cells = <0>;
+
+			status = "ok";
+		};
+
+		usb3_0: usb30@0 {
+			compatible = "qcom,dwc3";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			clocks = <&gcc USB30_0_MASTER_CLK>;
+			clock-names = "core";
+
+			ranges;
+
+			status = "ok";
+
+			dwc3@10000000 {
+				compatible = "snps,dwc3";
+				reg = <0x10000000 0xcd00>;
+				interrupts = <0 205 0x4>;
+				phys = <&hs_phy>, <&ss_phy>;
+				phy-names = "usb2-phy", "usb3-phy";
+				tx-fifo-resize;
+				dr_mode = "host";
+			};
+		};
+

Documentation/devicetree/bindings/usb/renesas_usbhs.txt

···
+Renesas Electronics USBHS driver
+
+Required properties:
+  - compatible: Must contain one of the following:
+	- "renesas,usbhs-r8a7790"
+	- "renesas,usbhs-r8a7791"
+  - reg: Base address and length of the register for the USBHS
+  - interrupts: Interrupt specifier for the USBHS
+  - clocks: A list of phandle + clock specifier pairs
+
+Optional properties:
+  - renesas,buswait: Integer to use BUSWAIT register
+  - renesas,enable-gpio: A gpio specifier to check GPIO determining if USB
+			 function should be enabled
+  - phys: phandle + phy specifier pair
+  - phy-names: must be "usb"
+
+Example:
+	usbhs: usb@e6590000 {
+		compatible = "renesas,usbhs-r8a7790";
+		reg = <0 0xe6590000 0 0x100>;
+		interrupts = <0 107 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&mstp7_clks R8A7790_CLK_HSUSB>;
+	};

Documentation/devicetree/bindings/usb/udc-xilinx.txt

···
+Xilinx USB2 device controller
+
+Required properties:
+- compatible		: Should be "xlnx,usb2-device-4.00.a"
+- reg			: Physical base address and size of the USB2
+			  device registers map.
+- interrupts		: Should contain single irq line of USB2 device
+			  controller
+- xlnx,has-builtin-dma	: if DMA is included
+
+Example:
+ 		axi-usb2-device@42e00000 {
+                        compatible = "xlnx,usb2-device-4.00.a";
+                        interrupts = <0x0 0x39 0x1>;
+                        reg = <0x42e00000 0x10000>;
+                        xlnx,has-builtin-dma;
+                };
+

MAINTAINERS

···
 F:	drivers/i2c/busses/i2c-st.c
 F:	drivers/tty/serial/st-asc.c
 F:	drivers/mmc/host/sdhci-st.c
+F:	drivers/usb/dwc3/dwc3-st.c
 
 ARM/TECHNOLOGIC SYSTEMS TS7250 MACHINE SUPPORT
 M:	Lennert Buytenhek <[e-mail]>
···
 M:	Laurent Pinchart <[e-mail]>
 L:	[e-mail]
 S:	Maintained
-F:	drivers/usb/gadget/function/*uvc*.c
+F:	drivers/usb/gadget/function/*uvc*
 F:	drivers/usb/gadget/legacy/webcam.c
 
 USB WIRELESS RNDIS DRIVER (rndis_wlan)

drivers/usb/dwc3/Kconfig

···
 	  Support of USB2/3 functionality in TI Keystone2 platforms.
 	  Say 'Y' or 'M' here if you have one such device
 
+config USB_DWC3_ST
+	tristate "STMicroelectronics Platforms"
+	depends on ARCH_STI && OF
+	default USB_DWC3
+	help
+	  STMicroelectronics SoCs with one DesignWare Core USB3 IP
+	  inside (i.e. STiH407).
+	  Say 'Y' or 'M' if you have one such device.
+
+config USB_DWC3_QCOM
+	tristate "Qualcomm Platforms"
+	depends on ARCH_QCOM || COMPILE_TEST
+	default USB_DWC3
+	help
+	  Recent Qualcomm SoCs ship with one DesignWare Core USB3 IP inside,
+	  say 'Y' or 'M' if you have one such device.
+
 comment "Debugging features"
 
 config USB_DWC3_DEBUG

drivers/usb/dwc3/Makefile

···
+# define_trace.h needs to know how to find our header
+CFLAGS_trace.o				:= -I$(src)
+
 ccflags-$(CONFIG_USB_DWC3_DEBUG)	:= -DDEBUG
 ccflags-$(CONFIG_USB_DWC3_VERBOSE)	+= -DVERBOSE_DEBUG
 
 obj-$(CONFIG_USB_DWC3)			+= dwc3.o
 
-dwc3-y					:= core.o
+dwc3-y					:= core.o debug.o trace.o
 
 ifneq ($(filter y,$(CONFIG_USB_DWC3_HOST) $(CONFIG_USB_DWC3_DUAL_ROLE)),)
 	dwc3-y				+= host.o
···
 obj-$(CONFIG_USB_DWC3_EXYNOS)		+= dwc3-exynos.o
 obj-$(CONFIG_USB_DWC3_PCI)		+= dwc3-pci.o
 obj-$(CONFIG_USB_DWC3_KEYSTONE)		+= dwc3-keystone.o
+obj-$(CONFIG_USB_DWC3_QCOM)		+= dwc3-qcom.o
+obj-$(CONFIG_USB_DWC3_ST)		+= dwc3-st.o

drivers/usb/dwc3/core.c

···
 
 	dwc->ev_buffs = devm_kzalloc(dwc->dev, sizeof(*dwc->ev_buffs) * num,
 			GFP_KERNEL);
-	if (!dwc->ev_buffs) {
-		dev_err(dwc->dev, "can't allocate event buffers array\n");
+	if (!dwc->ev_buffs)
 		return -ENOMEM;
-	}
 
 	for (i = 0; i < num; i++) {
 		struct dwc3_event_buffer	*evt;
···
 	void			*mem;
 
 	mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
-	if (!mem) {
-		dev_err(dev, "not enough memory\n");
+	if (!mem)
 		return -ENOMEM;
-	}
+
 	dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
 	dwc->mem = mem;
 	dwc->dev = dev;

drivers/usb/dwc3/core.h

···
 
 #include <linux/phy/phy.h>
 
+#define DWC3_MSG_MAX	500
+
 /* Global constants */
 #define DWC3_EP0_BOUNCE_SIZE	512
 #define DWC3_ENDPOINTS_NUM	32
···
 int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state);
 int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep,
 		unsigned cmd, struct dwc3_gadget_ep_cmd_params *params);
-int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param);
+int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param);
 #else
 static inline int dwc3_gadget_init(struct dwc3 *dwc)
 { return 0; }

drivers/usb/dwc3/debug.c

···
+/**
+ * debug.c - DesignWare USB3 DRD Controller Debug/Trace Support
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Felipe Balbi <[e-mail]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2  of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "debug.h"
+
+void dwc3_trace(void (*trace)(struct va_format *), const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	trace(&vaf);
+
+	va_end(args);
+}

drivers/usb/dwc3/debug.h

···
  * GNU General Public License for more details.
  */
 
+#ifndef __DWC3_DEBUG_H
+#define __DWC3_DEBUG_H
+
 #include "core.h"
+
+/**
+ * dwc3_gadget_ep_cmd_string - returns endpoint command string
+ * @cmd: command code
+ */
+static inline const char *
+dwc3_gadget_ep_cmd_string(u8 cmd)
+{
+	switch (cmd) {
+	case DWC3_DEPCMD_DEPSTARTCFG:
+		return "Start New Configuration";
+	case DWC3_DEPCMD_ENDTRANSFER:
+		return "End Transfer";
+	case DWC3_DEPCMD_UPDATETRANSFER:
+		return "Update Transfer";
+	case DWC3_DEPCMD_STARTTRANSFER:
+		return "Start Transfer";
+	case DWC3_DEPCMD_CLEARSTALL:
+		return "Clear Stall";
+	case DWC3_DEPCMD_SETSTALL:
+		return "Set Stall";
+	case DWC3_DEPCMD_GETEPSTATE:
+		return "Get Endpoint State";
+	case DWC3_DEPCMD_SETTRANSFRESOURCE:
+		return "Set Endpoint Transfer Resource";
+	case DWC3_DEPCMD_SETEPCONFIG:
+		return "Set Endpoint Configuration";
+	default:
+		return "UNKNOWN command";
+	}
+}
+
+/**
+ * dwc3_gadget_generic_cmd_string - returns generic command string
+ * @cmd: command code
+ */
+static inline const char *
+dwc3_gadget_generic_cmd_string(u8 cmd)
+{
+	switch (cmd) {
+	case DWC3_DGCMD_SET_LMP:
+		return "Set LMP";
+	case DWC3_DGCMD_SET_PERIODIC_PAR:
+		return "Set Periodic Parameters";
+	case DWC3_DGCMD_XMIT_FUNCTION:
+		return "Transmit Function Wake Device Notification";
+	case DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO:
+		return "Set Scratchpad Buffer Array Address Lo";
+	case DWC3_DGCMD_SET_SCRATCHPAD_ADDR_HI:
+		return "Set Scratchpad Buffer Array Address Hi";
+	case DWC3_DGCMD_SELECTED_FIFO_FLUSH:
+		return "Selected FIFO Flush";
+	case DWC3_DGCMD_ALL_FIFO_FLUSH:
+		return "All FIFO Flush";
+	case DWC3_DGCMD_SET_ENDPOINT_NRDY:
+		return "Set Endpoint NRDY";
+	case DWC3_DGCMD_RUN_SOC_BUS_LOOPBACK:
+		return "Run SoC Bus Loopback Test";
+	default:
+		return "UNKNOWN";
+	}
+}
+
+/**
+ * dwc3_gadget_link_string - returns link name
+ * @link_state: link state code
+ */
+static inline const char *
+dwc3_gadget_link_string(enum dwc3_link_state link_state)
+{
+	switch (link_state) {
+	case DWC3_LINK_STATE_U0:
+		return "U0";
+	case DWC3_LINK_STATE_U1:
+		return "U1";
+	case DWC3_LINK_STATE_U2:
+		return "U2";
+	case DWC3_LINK_STATE_U3:
+		return "U3";
+	case DWC3_LINK_STATE_SS_DIS:
+		return "SS.Disabled";
+	case DWC3_LINK_STATE_RX_DET:
+		return "RX.Detect";
+	case DWC3_LINK_STATE_SS_INACT:
+		return "SS.Inactive";
+	case DWC3_LINK_STATE_POLL:
+		return "Polling";
+	case DWC3_LINK_STATE_RECOV:
+		return "Recovery";
+	case DWC3_LINK_STATE_HRESET:
+		return "Hot Reset";
+	case DWC3_LINK_STATE_CMPLY:
+		return "Compliance";
+	case DWC3_LINK_STATE_LPBK:
+		return "Loopback";
+	case DWC3_LINK_STATE_RESET:
+		return "Reset";
+	case DWC3_LINK_STATE_RESUME:
+		return "Resume";
+	default:
+		return "UNKNOWN link state\n";
+	}
+}
+
+/**
+ * dwc3_gadget_event_string - returns event name
+ * @event: the event code
+ */
+static inline const char *dwc3_gadget_event_string(u8 event)
+{
+	switch (event) {
+	case DWC3_DEVICE_EVENT_DISCONNECT:
+		return "Disconnect";
+	case DWC3_DEVICE_EVENT_RESET:
+		return "Reset";
+	case DWC3_DEVICE_EVENT_CONNECT_DONE:
+		return "Connection Done";
+	case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
+		return "Link Status Change";
+	case DWC3_DEVICE_EVENT_WAKEUP:
+		return "WakeUp";
+	case DWC3_DEVICE_EVENT_EOPF:
+		return "End-Of-Frame";
+	case DWC3_DEVICE_EVENT_SOF:
+		return "Start-Of-Frame";
+	case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
+		return "Erratic Error";
+	case DWC3_DEVICE_EVENT_CMD_CMPL:
+		return "Command Complete";
+	case DWC3_DEVICE_EVENT_OVERFLOW:
+		return "Overflow";
+	}
+
+	return "UNKNOWN";
+}
+
+/**
+ * dwc3_ep_event_string - returns event name
+ * @event: then event code
+ */
+static inline const char *dwc3_ep_event_string(u8 event)
+{
+	switch (event) {
+	case DWC3_DEPEVT_XFERCOMPLETE:
+		return "Transfer Complete";
+	case DWC3_DEPEVT_XFERINPROGRESS:
+		return "Transfer In-Progress";
+	case DWC3_DEPEVT_XFERNOTREADY:
+		return "Transfer Not Ready";
+	case DWC3_DEPEVT_RXTXFIFOEVT:
+		return "FIFO";
+	case DWC3_DEPEVT_STREAMEVT:
+		return "Stream";
+	case DWC3_DEPEVT_EPCMDCMPLT:
+		return "Endpoint Command Complete";
+	}
+
+	return "UNKNOWN";
+}
+
+/**
+ * dwc3_gadget_event_type_string - return event name
+ * @event: the event code
+ */
+static inline const char *dwc3_gadget_event_type_string(u8 event)
+{
+	switch (event) {
+	case DWC3_DEVICE_EVENT_DISCONNECT:
+		return "Disconnect";
+	case DWC3_DEVICE_EVENT_RESET:
+		return "Reset";
+	case DWC3_DEVICE_EVENT_CONNECT_DONE:
+		return "Connect Done";
+	case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
+		return "Link Status Change";
+	case DWC3_DEVICE_EVENT_WAKEUP:
+		return "Wake-Up";
+	case DWC3_DEVICE_EVENT_HIBER_REQ:
+		return "Hibernation";
+	case DWC3_DEVICE_EVENT_EOPF:
+		return "End of Periodic Frame";
+	case DWC3_DEVICE_EVENT_SOF:
+		return "Start of Frame";
+	case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
+		return "Erratic Error";
+	case DWC3_DEVICE_EVENT_CMD_CMPL:
+		return "Command Complete";
+	case DWC3_DEVICE_EVENT_OVERFLOW:
+		return "Overflow";
+	default:
+		return "UNKNOWN";
+	}
+}
+
+void dwc3_trace(void (*trace)(struct va_format *), const char *fmt, ...);
 
 #ifdef CONFIG_DEBUG_FS
 extern int dwc3_debugfs_init(struct dwc3 *);
···
 static inline void dwc3_debugfs_exit(struct dwc3 *d)
 {  }
 #endif
-
+#endif /* __DWC3_DEBUG_H */

drivers/usb/dwc3/dwc3-exynos.c

···
 	int			ret;
 
 	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
-	if (!exynos) {
-		dev_err(dev, "not enough memory\n");
+	if (!exynos)
 		return -ENOMEM;
-	}
 
 	/*
 	 * Right now device-tree probed devices don't get dma_mask set.

drivers/usb/dwc3/dwc3-omap.c

···
 	}
 
 	omap = devm_kzalloc(dev, sizeof(*omap), GFP_KERNEL);
-	if (!omap) {
-		dev_err(dev, "not enough memory\n");
+	if (!omap)
 		return -ENOMEM;
-	}
 
 	platform_set_drvdata(pdev, omap);
 

drivers/usb/dwc3/dwc3-pci.c

···
 	struct device		*dev = &pci->dev;
 
 	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
-	if (!glue) {
-		dev_err(dev, "not enough memory\n");
+	if (!glue)
 		return -ENOMEM;
-	}
 
 	glue->dev = dev;
 

drivers/usb/dwc3/dwc3-qcom.c

···
+/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+
+struct dwc3_qcom {
+	struct device		*dev;
+
+	struct clk		*core_clk;
+	struct clk		*iface_clk;
+	struct clk		*sleep_clk;
+};
+
+static int dwc3_qcom_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct dwc3_qcom *qdwc;
+	int ret;
+
+	qdwc = devm_kzalloc(&pdev->dev, sizeof(*qdwc), GFP_KERNEL);
+	if (!qdwc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, qdwc);
+
+	qdwc->dev = &pdev->dev;
+
+	qdwc->core_clk = devm_clk_get(qdwc->dev, "core");
+	if (IS_ERR(qdwc->core_clk)) {
+		dev_err(qdwc->dev, "failed to get core clock\n");
+		return PTR_ERR(qdwc->core_clk);
+	}
+
+	qdwc->iface_clk = devm_clk_get(qdwc->dev, "iface");
+	if (IS_ERR(qdwc->iface_clk)) {
+		dev_dbg(qdwc->dev, "failed to get optional iface clock\n");
+		qdwc->iface_clk = NULL;
+	}
+
+	qdwc->sleep_clk = devm_clk_get(qdwc->dev, "sleep");
+	if (IS_ERR(qdwc->sleep_clk)) {
+		dev_dbg(qdwc->dev, "failed to get optional sleep clock\n");
+		qdwc->sleep_clk = NULL;
+	}
+
+	ret = clk_prepare_enable(qdwc->core_clk);
+	if (ret) {
+		dev_err(qdwc->dev, "failed to enable core clock\n");
+		goto err_core;
+	}
+
+	ret = clk_prepare_enable(qdwc->iface_clk);
+	if (ret) {
+		dev_err(qdwc->dev, "failed to enable optional iface clock\n");
+		goto err_iface;
+	}
+
+	ret = clk_prepare_enable(qdwc->sleep_clk);
+	if (ret) {
+		dev_err(qdwc->dev, "failed to enable optional sleep clock\n");
+		goto err_sleep;
+	}
+
+	ret = of_platform_populate(node, NULL, NULL, qdwc->dev);
+	if (ret) {
+		dev_err(qdwc->dev, "failed to register core - %d\n", ret);
+		goto err_clks;
+	}
+
+	return 0;
+
+err_clks:
+	clk_disable_unprepare(qdwc->sleep_clk);
+err_sleep:
+	clk_disable_unprepare(qdwc->iface_clk);
+err_iface:
+	clk_disable_unprepare(qdwc->core_clk);
+err_core:
+	return ret;
+}
+
+static int dwc3_qcom_remove(struct platform_device *pdev)
+{
+	struct dwc3_qcom *qdwc = platform_get_drvdata(pdev);
+
+	of_platform_depopulate(&pdev->dev);
+
+	clk_disable_unprepare(qdwc->sleep_clk);
+	clk_disable_unprepare(qdwc->iface_clk);
+	clk_disable_unprepare(qdwc->core_clk);
+
+	return 0;
+}
+
+static const struct of_device_id of_dwc3_match[] = {
+	{ .compatible = "qcom,dwc3" },
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_dwc3_match);
+
+static struct platform_driver dwc3_qcom_driver = {
+	.probe		= dwc3_qcom_probe,
+	.remove		= dwc3_qcom_remove,
+	.driver		= {
+		.name	= "qcom-dwc3",
+		.owner	= THIS_MODULE,
+		.of_match_table	= of_dwc3_match,
+	},
+};
+
+module_platform_driver(dwc3_qcom_driver);
+
+MODULE_ALIAS("platform:qcom-dwc3");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 QCOM Glue Layer");
+MODULE_AUTHOR("Ivan T. Ivanov <[e-mail]>");

drivers/usb/dwc3/dwc3-st.c

···
+/**
+ * dwc3-st.c Support for dwc3 platform devices on ST Microelectronics platforms
+ *
+ * This is a small driver for the dwc3 to provide the glue logic
+ * to configure the controller. Tested on STi platforms.
+ *
+ * Copyright (C) 2014 Stmicroelectronics
+ *
+ * Author: Giuseppe Cavallaro <[e-mail]>
+ * Contributors: Aymen Bouattay <[e-mail]>
+ *               Peter Griffin <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Inspired by dwc3-omap.c and dwc3-exynos.c.
+ */
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/usb/of.h>
+
+#include "core.h"
+#include "io.h"
+
+/* glue registers */
+#define CLKRST_CTRL		0x00
+#define AUX_CLK_EN		BIT(0)
+#define SW_PIPEW_RESET_N	BIT(4)
+#define EXT_CFG_RESET_N		BIT(8)
+/*
+ * 1'b0 : The host controller complies with the xHCI revision 0.96
+ * 1'b1 : The host controller complies with the xHCI revision 1.0
+ */
+#define XHCI_REVISION		BIT(12)
+
+#define USB2_VBUS_MNGMNT_SEL1	0x2C
+/*
+ * For all fields in USB2_VBUS_MNGMNT_SEL1
+ * 2’b00 : Override value from Reg 0x30 is selected
+ * 2’b01 : utmiotg_<signal_name> from usb3_top is selected
+ * 2’b10 : pipew_<signal_name> from PIPEW instance is selected
+ * 2’b11 : value is 1'b0
+ */
+#define USB2_VBUS_REG30		0x0
+#define USB2_VBUS_UTMIOTG	0x1
+#define USB2_VBUS_PIPEW		0x2
+#define USB2_VBUS_ZERO		0x3
+
+#define SEL_OVERRIDE_VBUSVALID(n)	(n << 0)
+#define SEL_OVERRIDE_POWERPRESENT(n)	(n << 4)
+#define SEL_OVERRIDE_BVALID(n)		(n << 8)
+
+/* Static DRD configuration */
+#define USB3_CONTROL_MASK		0xf77
+
+#define USB3_DEVICE_NOT_HOST		BIT(0)
+#define USB3_FORCE_VBUSVALID		BIT(1)
+#define USB3_DELAY_VBUSVALID		BIT(2)
+#define USB3_SEL_FORCE_OPMODE		BIT(4)
+#define USB3_FORCE_OPMODE(n)		(n << 5)
+#define USB3_SEL_FORCE_DPPULLDOWN2	BIT(8)
+#define USB3_FORCE_DPPULLDOWN2		BIT(9)
+#define USB3_SEL_FORCE_DMPULLDOWN2	BIT(10)
+#define USB3_FORCE_DMPULLDOWN2		BIT(11)
+
+/**
+ * struct st_dwc3 - dwc3-st driver private structure
+ * @dev:		device pointer
+ * @glue_base:		ioaddr for the glue registers
+ * @regmap:		regmap pointer for getting syscfg
+ * @syscfg_reg_off:	usb syscfg control offset
+ * @dr_mode:		drd static host/device config
+ * @rstc_pwrdn:		rest controller for powerdown signal
+ * @rstc_rst:		reset controller for softreset signal
+ */
+
+struct st_dwc3 {
+	struct device *dev;
+	void __iomem *glue_base;
+	struct regmap *regmap;
+	int syscfg_reg_off;
+	enum usb_dr_mode dr_mode;
+	struct reset_control *rstc_pwrdn;
+	struct reset_control *rstc_rst;
+};
+
+static inline u32 st_dwc3_readl(void __iomem *base, u32 offset)
+{
+	return readl_relaxed(base + offset);
+}
+
+static inline void st_dwc3_writel(void __iomem *base, u32 offset, u32 value)
+{
+	writel_relaxed(value, base + offset);
+}
+
+/**
+ * st_dwc3_drd_init: program the port
+ * @dwc3_data: driver private structure
+ * Description: this function is to program the port as either host or device
+ * according to the static configuration passed from devicetree.
+ * OTG and dual role are not yet supported!
+ */
+static int st_dwc3_drd_init(struct st_dwc3 *dwc3_data)
+{
+	u32 val;
+	int err;
+
+	err = regmap_read(dwc3_data->regmap, dwc3_data->syscfg_reg_off, &val);
+	if (err)
+		return err;
+
+	val &= USB3_CONTROL_MASK;
+
+	switch (dwc3_data->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+
+		val &= ~(USB3_FORCE_VBUSVALID | USB3_DELAY_VBUSVALID
+			| USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
+			| USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
+			| USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
+
+		val |= USB3_DEVICE_NOT_HOST;
+
+		dev_dbg(dwc3_data->dev, "Configuring as Device\n");
+		break;
+
+	case USB_DR_MODE_HOST:
+
+		val &= ~(USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID
+			| USB3_SEL_FORCE_OPMODE	| USB3_FORCE_OPMODE(0x3)
+			| USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
+			| USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
+
+		/*
+		 * USB3_DELAY_VBUSVALID is ANDed with USB_C_VBUSVALID. Thus,
+		 * when set to ‘0‘, it can delay the arrival of VBUSVALID
+		 * information to VBUSVLDEXT2 input of the pico PHY.
+		 * We don't want to do that so we set the bit to '1'.
+		 */
+
+		val |= USB3_DELAY_VBUSVALID;
+
+		dev_dbg(dwc3_data->dev, "Configuring as Host\n");
+		break;
+
+	default:
+		dev_err(dwc3_data->dev, "Unsupported mode of operation %d\n",
+			dwc3_data->dr_mode);
+		return -EINVAL;
+	}
+
+	return regmap_write(dwc3_data->regmap, dwc3_data->syscfg_reg_off, val);
+}
+
+/**
+ * st_dwc3_init: init the controller via glue logic
+ * @dwc3_data: driver private structure
+ */
+static void st_dwc3_init(struct st_dwc3 *dwc3_data)
+{
+	u32 reg = st_dwc3_readl(dwc3_data->glue_base, CLKRST_CTRL);
+
+	reg |= AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION;
+	reg &= ~SW_PIPEW_RESET_N;
+	st_dwc3_writel(dwc3_data->glue_base, CLKRST_CTRL, reg);
+
+	/* configure mux for vbus, powerpresent and bvalid signals */
+	reg = st_dwc3_readl(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1);
+
+	reg |= SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) |
+		SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) |
+		SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG);
+
+	st_dwc3_writel(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1, reg);
+
+	reg = st_dwc3_readl(dwc3_data->glue_base, CLKRST_CTRL);
+	reg |= SW_PIPEW_RESET_N;
+	st_dwc3_writel(dwc3_data->glue_base, CLKRST_CTRL, reg);
+}
+
+static int st_dwc3_probe(struct platform_device *pdev)
+{
+	struct st_dwc3 *dwc3_data;
+	struct resource *res;
+	struct device *dev = &pdev->dev;
+	struct device_node *node = dev->of_node, *child;
+	struct regmap *regmap;
+	int ret;
+
+	dwc3_data = devm_kzalloc(dev, sizeof(*dwc3_data), GFP_KERNEL);
+	if (!dwc3_data)
+		return -ENOMEM;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg-glue");
+	dwc3_data->glue_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(dwc3_data->glue_base))
+		return PTR_ERR(dwc3_data->glue_base);
+
+	regmap = syscon_regmap_lookup_by_phandle(node, "st,syscfg");
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	dma_set_coherent_mask(dev, dev->coherent_dma_mask);
+	dwc3_data->dev = dev;
+	dwc3_data->regmap = regmap;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "syscfg-reg");
+	if (!res) {
+		ret = -ENXIO;
+		goto undo_platform_dev_alloc;
+	}
+
+	dwc3_data->syscfg_reg_off = res->start;
+
+	dev_vdbg(&pdev->dev, "glue-logic addr 0x%p, syscfg-reg offset 0x%x\n",
+		 dwc3_data->glue_base, dwc3_data->syscfg_reg_off);
+
+	dwc3_data->rstc_pwrdn = devm_reset_control_get(dev, "powerdown");
+	if (IS_ERR(dwc3_data->rstc_pwrdn)) {
+		dev_err(&pdev->dev, "could not get power controller\n");
+		ret = PTR_ERR(dwc3_data->rstc_pwrdn);
+		goto undo_platform_dev_alloc;
+	}
+
+	/* Manage PowerDown */
+	reset_control_deassert(dwc3_data->rstc_pwrdn);
+
+	dwc3_data->rstc_rst = devm_reset_control_get(dev, "softreset");
+	if (IS_ERR(dwc3_data->rstc_rst)) {
+		dev_err(&pdev->dev, "could not get reset controller\n");
+		ret = PTR_ERR(dwc3_data->rstc_pwrdn);
+		goto undo_powerdown;
+	}
+
+	/* Manage SoftReset */
+	reset_control_deassert(dwc3_data->rstc_rst);
+
+	child = of_get_child_by_name(node, "dwc3");
+	if (!child) {
+		dev_err(&pdev->dev, "failed to find dwc3 core node\n");
+		ret = -ENODEV;
+		goto undo_softreset;
+	}
+
+	dwc3_data->dr_mode = of_usb_get_dr_mode(child);
+
+	/* Allocate and initialize the core */
+	ret = of_platform_populate(node, NULL, NULL, dev);
+	if (ret) {
+		dev_err(dev, "failed to add dwc3 core\n");
+		goto undo_softreset;
+	}
+
+	/*
+	 * Configure the USB port as device or host according to the static
+	 * configuration passed from DT.
+	 * DRD is the only mode currently supported so this will be enhanced
+	 * as soon as OTG is available.
+	 */
+	ret = st_dwc3_drd_init(dwc3_data);
+	if (ret) {
+		dev_err(dev, "drd initialisation failed\n");
+		goto undo_softreset;
+	}
+
+	/* ST glue logic init */
+	st_dwc3_init(dwc3_data);
+
+	platform_set_drvdata(pdev, dwc3_data);
+	return 0;
+
+undo_softreset:
+	reset_control_assert(dwc3_data->rstc_rst);
+undo_powerdown:
+	reset_control_assert(dwc3_data->rstc_pwrdn);
+undo_platform_dev_alloc:
+	platform_device_put(pdev);
+	return ret;
+}
+
+static int st_dwc3_remove(struct platform_device *pdev)
+{
+	struct st_dwc3 *dwc3_data = platform_get_drvdata(pdev);
+
+	of_platform_depopulate(&pdev->dev);
+
+	reset_control_assert(dwc3_data->rstc_pwrdn);
+	reset_control_assert(dwc3_data->rstc_rst);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int st_dwc3_suspend(struct device *dev)
+{
+	struct st_dwc3 *dwc3_data = dev_get_drvdata(dev);
+
+	reset_control_assert(dwc3_data->rstc_pwrdn);
+	reset_control_assert(dwc3_data->rstc_rst);
+
+	pinctrl_pm_select_sleep_state(dev);
+
+	return 0;
+}
+
+static int st_dwc3_resume(struct device *dev)
+{
+	struct st_dwc3 *dwc3_data = dev_get_drvdata(dev);
+	int ret;
+
+	pinctrl_pm_select_default_state(dev);
+
+	reset_control_deassert(dwc3_data->rstc_pwrdn);
+	reset_control_deassert(dwc3_data->rstc_rst);
+
+	ret = st_dwc3_drd_init(dwc3_data);
+	if (ret) {
+		dev_err(dev, "drd initialisation failed\n");
+		return ret;
+	}
+
+	/* ST glue logic init */
+	st_dwc3_init(dwc3_data);
+
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(st_dwc3_dev_pm_ops, st_dwc3_suspend, st_dwc3_resume);
+
+static const struct of_device_id st_dwc3_match[] = {
+	{ .compatible = "st,stih407-dwc3" },
+	{ /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, st_dwc3_match);
+
+static struct platform_driver st_dwc3_driver = {
+	.probe = st_dwc3_probe,
+	.remove = st_dwc3_remove,
+	.driver = {
+		.name = "usb-st-dwc3",
+		.of_match_table = st_dwc3_match,
+		.pm = &st_dwc3_dev_pm_ops,
+	},
+};
+
+module_platform_driver(st_dwc3_driver);
+
+MODULE_AUTHOR("Giuseppe Cavallaro <[e-mail]>");
+MODULE_DESCRIPTION("DesignWare USB3 STi Glue Layer");
+MODULE_LICENSE("GPL v2");

drivers/usb/dwc3/ep0.c

···
 #include <linux/usb/composite.h>
 
 #include "core.h"
+#include "debug.h"
 #include "gadget.h"
 #include "io.h"
 
···
 
 	dep = dwc->eps[epnum];
 	if (dep->flags & DWC3_EP_BUSY) {
-		dev_vdbg(dwc->dev, "%s: still busy\n", dep->name);
+		dwc3_trace(trace_dwc3_ep0, "%s still busy", dep->name);
 		return 0;
 	}
 
···
 	ret = dwc3_send_gadget_ep_cmd(dwc, dep->number,
 			DWC3_DEPCMD_STARTTRANSFER, &params);
 	if (ret < 0) {
-		dev_dbg(dwc->dev, "failed to send STARTTRANSFER command\n");
+		dwc3_trace(trace_dwc3_ep0, "%s STARTTRANSFER failed",
+				dep->name);
 		return ret;
 	}
 
···
 		if (dwc->ep0state == EP0_STATUS_PHASE)
 			__dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
 		else
-			dev_dbg(dwc->dev, "too early for delayed status\n");
+			dwc3_trace(trace_dwc3_ep0,
+					"too early for delayed status");
 
 		return 0;
 	}
···
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	if (!dep->endpoint.desc) {
-		dev_dbg(dwc->dev, "trying to queue request %p to disabled %s\n",
+		dwc3_trace(trace_dwc3_ep0,
+				"trying to queue request %p to disabled %s",
 				request, dep->name);
 		ret = -ESHUTDOWN;
 		goto out;
···
 		goto out;
 	}
 
-	dev_vdbg(dwc->dev, "queueing request %p to %s length %d, state '%s'\n",
+	dwc3_trace(trace_dwc3_ep0,
+			"queueing request %p to %s length %d state '%s'",
 			request, dep->name, request->length,
 			dwc3_ep0_state_string(dwc->ep0state));
 
···
 
 	addr = le16_to_cpu(ctrl->wValue);
 	if (addr > 127) {
-		dev_dbg(dwc->dev, "invalid device address %d\n", addr);
+		dwc3_trace(trace_dwc3_ep0, "invalid device address %d", addr);
 		return -EINVAL;
 	}
 
 	if (state == USB_STATE_CONFIGURED) {
-		dev_dbg(dwc->dev, "trying to set address when configured\n");
+		dwc3_trace(trace_dwc3_ep0,
+				"trying to set address when configured");
 		return -EINVAL;
 	}
 
···
 			dwc3_writel(dwc->regs, DWC3_DCTL, reg);
 
 			dwc->resize_fifos = true;
-			dev_dbg(dwc->dev, "resize fifos flag SET\n");
+			dwc3_trace(trace_dwc3_ep0, "resize FIFOs flag SET");
 		}
 		break;
 
···
 
 	switch (ctrl->bRequest) {
 	case USB_REQ_GET_STATUS:
-		dev_vdbg(dwc->dev, "USB_REQ_GET_STATUS\n");
+		dwc3_trace(trace_dwc3_ep0, "USB_REQ_GET_STATUS\n");
 		ret = dwc3_ep0_handle_status(dwc, ctrl);
 		break;
 	case USB_REQ_CLEAR_FEATURE:
-		dev_vdbg(dwc->dev, "USB_REQ_CLEAR_FEATURE\n");
+		dwc3_trace(trace_dwc3_ep0, "USB_REQ_CLEAR_FEATURE\n");
 		ret = dwc3_ep0_handle_feature(dwc, ctrl, 0);
 		break;
 	case USB_REQ_SET_FEATURE:
-		dev_vdbg(dwc->dev, "USB_REQ_SET_FEATURE\n");
+		dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_FEATURE\n");
 		ret = dwc3_ep0_handle_feature(dwc, ctrl, 1);
 		break;
 	case USB_REQ_SET_ADDRESS:
-		dev_vdbg(dwc->dev, "USB_REQ_SET_ADDRESS\n");
+		dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_ADDRESS\n");
 		ret = dwc3_ep0_set_address(dwc, ctrl);
 		break;
 	case USB_REQ_SET_CONFIGURATION:
-		dev_vdbg(dwc->dev, "USB_REQ_SET_CONFIGURATION\n");
+		dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_CONFIGURATION\n");
 		ret = dwc3_ep0_set_config(dwc, ctrl);
 		break;
 	case USB_REQ_SET_SEL:
-		dev_vdbg(dwc->dev, "USB_REQ_SET_SEL\n");
+		dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_SEL\n");
 		ret = dwc3_ep0_set_sel(dwc, ctrl);
 		break;
 	case USB_REQ_SET_ISOCH_DELAY:
-		dev_vdbg(dwc->dev, "USB_REQ_SET_ISOCH_DELAY\n");
+		dwc3_trace(trace_dwc3_ep0, "USB_REQ_SET_ISOCH_DELAY\n");
 		ret = dwc3_ep0_set_isoch_delay(dwc, ctrl);
 		break;
 	default:
-		dev_vdbg(dwc->dev, "Forwarding to gadget driver\n");
+		dwc3_trace(trace_dwc3_ep0, "Forwarding to gadget driver\n");
 		ret = dwc3_ep0_delegate_req(dwc, ctrl);
 		break;
 	}
···
 
 	if (!dwc->gadget_driver)
 		goto out;
+
+	trace_dwc3_ctrl_req(ctrl);
 
 	len = le16_to_cpu(ctrl->wLength);
 	if (!len) {
···
 
 	status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 	if (status == DWC3_TRBSTS_SETUP_PENDING) {
-		dev_dbg(dwc->dev, "Setup Pending received\n");
+		dwc3_trace(trace_dwc3_ep0, "Setup Pending received");
 
 		if (r)
 			dwc3_gadget_giveback(ep0, r, -ECONNRESET);
···
 
 		ret = dwc3_gadget_set_test_mode(dwc, dwc->test_mode_nr);
 		if (ret < 0) {
-			dev_dbg(dwc->dev, "Invalid Test #%d\n",
+			dwc3_trace(trace_dwc3_ep0, "Invalid Test #%d",
 					dwc->test_mode_nr);
 			dwc3_ep0_stall_and_restart(dwc);
 			return;
···
 
 	status = DWC3_TRB_SIZE_TRBSTS(trb->size);
 	if (status == DWC3_TRBSTS_SETUP_PENDING)
-		dev_dbg(dwc->dev, "Setup Pending received\n");
+		dwc3_trace(trace_dwc3_ep0, "Setup Pending received\n");
 
 	dwc->ep0state = EP0_SETUP_PHASE;
 	dwc3_ep0_out_start(dwc);
···
 
 	switch (dwc->ep0state) {
 	case EP0_SETUP_PHASE:
-		dev_vdbg(dwc->dev, "Inspecting Setup Bytes\n");
+		dwc3_trace(trace_dwc3_ep0, "Setup Phase");
 		dwc3_ep0_inspect_setup(dwc, event);
 		break;
 
 	case EP0_DATA_PHASE:
-		dev_vdbg(dwc->dev, "Data Phase\n");
+		dwc3_trace(trace_dwc3_ep0, "Data Phase");
 		dwc3_ep0_complete_data(dwc, event);
 		break;
 
 	case EP0_STATUS_PHASE:
-		dev_vdbg(dwc->dev, "Status Phase\n");
+		dwc3_trace(trace_dwc3_ep0, "Status Phase");
 		dwc3_ep0_complete_status(dwc, event);
 		break;
 	default:
···
 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep)
 {
 	if (dwc->resize_fifos) {
-		dev_dbg(dwc->dev, "starting to resize fifos\n");
+		dwc3_trace(trace_dwc3_ep0, "Resizing FIFOs");
 		dwc3_gadget_resize_tx_fifos(dwc);
 		dwc->resize_fifos = 0;
 	}
···
 
 	switch (event->status) {
 	case DEPEVT_STATUS_CONTROL_DATA:
-		dev_vdbg(dwc->dev, "Control Data\n");
+		dwc3_trace(trace_dwc3_ep0, "Control Data");
 
 		/*
 		 * We already have a DATA transfer in the controller's cache,
···
 		if (dwc->ep0_expect_in != event->endpoint_number) {
 			struct dwc3_ep	*dep = dwc->eps[dwc->ep0_expect_in];
 
-			dev_vdbg(dwc->dev, "Wrong direction for Data phase\n");
+			dwc3_trace(trace_dwc3_ep0,
+					"Wrong direction for Data phase");
 			dwc3_ep0_end_control_data(dwc, dep);
 			dwc3_ep0_stall_and_restart(dwc);
 			return;
···
 		if (dwc->ep0_next_event != DWC3_EP0_NRDY_STATUS)
 			return;
 
-		dev_vdbg(dwc->dev, "Control Status\n");
+		dwc3_trace(trace_dwc3_ep0, "Control Status");
 
 		dwc->ep0state = EP0_STATUS_PHASE;
 
 		if (dwc->delayed_status) {
 			WARN_ON_ONCE(event->endpoint_number != 1);
-			dev_vdbg(dwc->dev, "Mass Storage delayed status\n");
+			dwc3_trace(trace_dwc3_ep0, "Delayed Status");
 			return;
 		}
 
···
 {
 	u8			epnum = event->endpoint_number;
 
-	dev_dbg(dwc->dev, "%s while ep%d%s in state '%s'\n",
+	dwc3_trace(trace_dwc3_ep0, "%s while ep%d%s in state '%s'",
 			dwc3_ep_event_string(event->endpoint_event),
 			epnum >> 1, (epnum & 1) ? "in" : "out",
 			dwc3_ep0_state_string(dwc->ep0state));

drivers/usb/dwc3/gadget.c

···
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 
+#include "debug.h"
 #include "core.h"
 #include "gadget.h"
 #include "io.h"
···
 	dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
 			req, dep->name, req->request.actual,
 			req->request.length, status);
+	trace_dwc3_gadget_giveback(req);
 
 	spin_unlock(&dwc->lock);
 	req->request.complete(&dep->endpoint, &req->request);
 	spin_lock(&dwc->lock);
 }
 
-static const char *dwc3_gadget_ep_cmd_string(u8 cmd)
-{
-	switch (cmd) {
-	case DWC3_DEPCMD_DEPSTARTCFG:
-		return "Start New Configuration";
-	case DWC3_DEPCMD_ENDTRANSFER:
-		return "End Transfer";
-	case DWC3_DEPCMD_UPDATETRANSFER:
-		return "Update Transfer";
-	case DWC3_DEPCMD_STARTTRANSFER:
-		return "Start Transfer";
-	case DWC3_DEPCMD_CLEARSTALL:
-		return "Clear Stall";
-	case DWC3_DEPCMD_SETSTALL:
-		return "Set Stall";
-	case DWC3_DEPCMD_GETEPSTATE:
-		return "Get Endpoint State";
-	case DWC3_DEPCMD_SETTRANSFRESOURCE:
-		return "Set Endpoint Transfer Resource";
-	case DWC3_DEPCMD_SETEPCONFIG:
-		return "Set Endpoint Configuration";
-	default:
-		return "UNKNOWN command";
-	}
-}
-
-static const char *dwc3_gadget_generic_cmd_string(u8 cmd)
-{
-	switch (cmd) {
-	case DWC3_DGCMD_SET_LMP:
-		return "Set LMP";
-	case DWC3_DGCMD_SET_PERIODIC_PAR:
-		return "Set Periodic Parameters";
-	case DWC3_DGCMD_XMIT_FUNCTION:
-		return "Transmit Function Wake Device Notification";
-	case DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO:
-		return "Set Scratchpad Buffer Array Address Lo";
-	case DWC3_DGCMD_SET_SCRATCHPAD_ADDR_HI:
-		return "Set Scratchpad Buffer Array Address Hi";
-	case DWC3_DGCMD_SELECTED_FIFO_FLUSH:
-		return "Selected FIFO Flush";
-	case DWC3_DGCMD_ALL_FIFO_FLUSH:
-		return "All FIFO Flush";
-	case DWC3_DGCMD_SET_ENDPOINT_NRDY:
-		return "Set Endpoint NRDY";
-	case DWC3_DGCMD_RUN_SOC_BUS_LOOPBACK:
-		return "Run SoC Bus Loopback Test";
-	default:
-		return "UNKNOWN";
-	}
-}
-
-static const char *dwc3_gadget_link_string(enum dwc3_link_state link_state)
-{
-	switch (link_state) {
-	case DWC3_LINK_STATE_U0:
-		return "U0";
-	case DWC3_LINK_STATE_U1:
-		return "U1";
-	case DWC3_LINK_STATE_U2:
-		return "U2";
-	case DWC3_LINK_STATE_U3:
-		return "U3";
-	case DWC3_LINK_STATE_SS_DIS:
-		return "SS.Disabled";
-	case DWC3_LINK_STATE_RX_DET:
-		return "RX.Detect";
-	case DWC3_LINK_STATE_SS_INACT:
-		return "SS.Inactive";
-	case DWC3_LINK_STATE_POLL:
-		return "Polling";
-	case DWC3_LINK_STATE_RECOV:
-		return "Recovery";
-	case DWC3_LINK_STATE_HRESET:
-		return "Hot Reset";
-	case DWC3_LINK_STATE_CMPLY:
-		return "Compliance";
-	case DWC3_LINK_STATE_LPBK:
-		return "Loopback";
-	case DWC3_LINK_STATE_RESET:
-		return "Reset";
-	case DWC3_LINK_STATE_RESUME:
-		return "Resume";
-	default:
-		return "UNKNOWN link state\n";
-	}
-}
-
-int dwc3_send_gadget_generic_command(struct dwc3 *dwc, int cmd, u32 param)
+int dwc3_send_gadget_generic_command(struct dwc3 *dwc, unsigned cmd, u32 param)
 {
 	u32		timeout = 500;
 	u32		reg;
 
-	dev_vdbg(dwc->dev, "generic cmd '%s' [%d] param %08x\n",
-			dwc3_gadget_generic_cmd_string(cmd), cmd, param);
+	trace_dwc3_gadget_generic_cmd(cmd, param);
 
 	dwc3_writel(dwc->regs, DWC3_DGCMDPAR, param);
 	dwc3_writel(dwc->regs, DWC3_DGCMD, cmd | DWC3_DGCMD_CMDACT);
···
 	u32			timeout = 500;
 	u32			reg;
 
-	dev_vdbg(dwc->dev, "%s: cmd '%s' [%d] params %08x %08x %08x\n",
-			dep->name,
-			dwc3_gadget_ep_cmd_string(cmd), cmd, params->param0,
-			params->param1, params->param2);
+	trace_dwc3_gadget_ep_cmd(dep, cmd, params);
 
 	dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
 	dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1);
···
 {
 	struct dwc3_request		*req;
 	struct dwc3_ep			*dep = to_dwc3_ep(ep);
-	struct dwc3			*dwc = dep->dwc;
 
 	req = kzalloc(sizeof(*req), gfp_flags);
-	if (!req) {
-		dev_err(dwc->dev, "not enough memory\n");
+	if (!req)
 		return NULL;
-	}
 
 	req->epnum	= dep->number;
 	req->dep	= dep;
+
+	trace_dwc3_alloc_request(req);
 
 	return &req->request;
 }
···
 {
 	struct dwc3_request		*req = to_dwc3_request(request);
 
+	trace_dwc3_free_request(req);
 	kfree(req);
 }
 
···
 		trb->ctrl |= DWC3_TRB_CTRL_SID_SOFN(req->request.stream_id);
 
 	trb->ctrl |= DWC3_TRB_CTRL_HWO;
+
+	trace_dwc3_prepare_trb(dep, trb);
 }
 
 /*
···
 
 	dev_vdbg(dwc->dev, "queing request %p to %s length %d\n",
 			request, ep->name, request->length);
+	trace_dwc3_ep_queue(req);
 
 	ret = __dwc3_gadget_ep_queue(dep, req);
 	spin_unlock_irqrestore(&dwc->lock, flags);
···
 
 	unsigned long			flags;
 	int				ret = 0;
+
+	trace_dwc3_ep_dequeue(req);
 
 	spin_lock_irqsave(&dwc->lock, flags);
 
···
 		u8 epnum = (i << 1) | (!!direction);
 
 		dep = kzalloc(sizeof(*dep), GFP_KERNEL);
-		if (!dep) {
-			dev_err(dwc->dev, "can't allocate endpoint %d\n",
-					epnum);
+		if (!dep)
 			return -ENOMEM;
-		}
 
 		dep->dwc = dwc;
 		dep->number = epnum;
···
 	unsigned int		count;
 	unsigned int		s_pkt = 0;
 	unsigned int		trb_status;
+
+	trace_dwc3_complete_trb(dep, trb);
 
 	if ((trb->ctrl & DWC3_TRB_CTRL_HWO) && status != -ESHUTDOWN)
 		/*
···
 
 	if (!(dep->flags & DWC3_EP_ENABLED))
 		return;
-
-	dev_vdbg(dwc->dev, "%s: %s\n", dep->name,
-			dwc3_ep_event_string(event->endpoint_event));
 
 	if (epnum == 0 || epnum == 1) {
 		dwc3_ep0_interrupt(dwc, event);
···
 {
 	int			reg;
 
-	dev_vdbg(dwc->dev, "%s\n", __func__);
-
 	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 	reg &= ~DWC3_DCTL_INITU1ENA;
 	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
···
 static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
 {
 	u32			reg;
-
-	dev_vdbg(dwc->dev, "%s\n", __func__);
 
 	/*
 	 * WORKAROUND: DWC3 revisions <1.88a have an issue which
···
 	int			ret;
 	u32			reg;
 	u8			speed;
-
-	dev_vdbg(dwc->dev, "%s\n", __func__);
 
 	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 	speed = reg & DWC3_DSTS_CONNECTSPD;
···
 
 static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
 {
-	dev_vdbg(dwc->dev, "%s\n", __func__);
-
 	/*
 	 * TODO take core out of low power mode when that's
 	 * implemented.
···
 		break;
 	}
 
-	dev_vdbg(dwc->dev, "link change: %s [%d] -> %s [%d]\n",
-			dwc3_gadget_link_string(dwc->link_state),
-			dwc->link_state, dwc3_gadget_link_string(next), next);
-
 	dwc->link_state = next;
 }
 
···
 static void dwc3_process_event_entry(struct dwc3 *dwc,
 		const union dwc3_event *event)
 {
+	trace_dwc3_event(event->raw);
+
 	/* Endpoint IRQ, handle it and return early */
 	if (event->type.is_devspec == 0) {
 		/* depevt */
···
 
 	dwc->setup_buf = kzalloc(DWC3_EP0_BOUNCE_SIZE, GFP_KERNEL);
 	if (!dwc->setup_buf) {
-		dev_err(dwc->dev, "failed to allocate setup buffer\n");
 		ret = -ENOMEM;
 		goto err2;
 	}

drivers/usb/dwc3/gadget.h

···
 	return DWC3_DEPCMD_GET_RSC_IDX(res_id);
 }
 
-/**
- * dwc3_gadget_event_string - returns event name
- * @event: the event code
- */
-static inline const char *dwc3_gadget_event_string(u8 event)
-{
-	switch (event) {
-	case DWC3_DEVICE_EVENT_DISCONNECT:
-		return "Disconnect";
-	case DWC3_DEVICE_EVENT_RESET:
-		return "Reset";
-	case DWC3_DEVICE_EVENT_CONNECT_DONE:
-		return "Connection Done";
-	case DWC3_DEVICE_EVENT_LINK_STATUS_CHANGE:
-		return "Link Status Change";
-	case DWC3_DEVICE_EVENT_WAKEUP:
-		return "WakeUp";
-	case DWC3_DEVICE_EVENT_EOPF:
-		return "End-Of-Frame";
-	case DWC3_DEVICE_EVENT_SOF:
-		return "Start-Of-Frame";
-	case DWC3_DEVICE_EVENT_ERRATIC_ERROR:
-		return "Erratic Error";
-	case DWC3_DEVICE_EVENT_CMD_CMPL:
-		return "Command Complete";
-	case DWC3_DEVICE_EVENT_OVERFLOW:
-		return "Overflow";
-	}
-
-	return "UNKNOWN";
-}
-
-/**
- * dwc3_ep_event_string - returns event name
- * @event: then event code
- */
-static inline const char *dwc3_ep_event_string(u8 event)
-{
-	switch (event) {
-	case DWC3_DEPEVT_XFERCOMPLETE:
-		return "Transfer Complete";
-	case DWC3_DEPEVT_XFERINPROGRESS:
-		return "Transfer In-Progress";
-	case DWC3_DEPEVT_XFERNOTREADY:
-		return "Transfer Not Ready";
-	case DWC3_DEPEVT_RXTXFIFOEVT:
-		return "FIFO";
-	case DWC3_DEPEVT_STREAMEVT:
-		return "Stream";
-	case DWC3_DEPEVT_EPCMDCMPLT:
-		return "Endpoint Command Complete";
-	}
-
-	return "UNKNOWN";
-}
-
 #endif /* __DRIVERS_USB_DWC3_GADGET_H */

drivers/usb/dwc3/io.h

···
 #define __DRIVERS_USB_DWC3_IO_H
 
 #include <linux/io.h>
-
+#include "trace.h"
+#include "debug.h"
 #include "core.h"
 
 static inline u32 dwc3_readl(void __iomem *base, u32 offset)
 {
+	u32 offs = offset - DWC3_GLOBALS_REGS_START;
+	u32 value;
+
 	/*
 	 * We requested the mem region starting from the Globals address
 	 * space, see dwc3_probe in core.c.
 	 * However, the offsets are given starting from xHCI address space.
 	 */
-	return readl(base + (offset - DWC3_GLOBALS_REGS_START));
+	value = readl(base + offs);
+
+	/*
+	 * When tracing we want to make it easy to find the correct address on
+	 * documentation, so we revert it back to the proper addresses, the
+	 * same way they are described on SNPS documentation
+	 */
+	dwc3_trace(trace_dwc3_readl, "addr %p value %08x",
+			base - DWC3_GLOBALS_REGS_START + offset, value);
+
+	return value;
 }
 
 static inline void dwc3_writel(void __iomem *base, u32 offset, u32 value)
 {
+	u32 offs = offset - DWC3_GLOBALS_REGS_START;
+
 	/*
 	 * We requested the mem region starting from the Globals address
 	 * space, see dwc3_probe in core.c.
 	 * However, the offsets are given starting from xHCI address space.
 	 */
-	writel(value, base + (offset - DWC3_GLOBALS_REGS_START));
+	writel(value, base + offs);
+
+	/*
+	 * When tracing we want to make it easy to find the correct address on
+	 * documentation, so we revert it back to the proper addresses, the
+	 * same way they are described on SNPS documentation
+	 */
+	dwc3_trace(trace_dwc3_writel, "addr %p value %08x",
+			base - DWC3_GLOBALS_REGS_START + offset, value);
 }
 
 #endif /* __DRIVERS_USB_DWC3_IO_H */

drivers/usb/dwc3/trace.c

···
+/**
+ * trace.c - DesignWare USB3 DRD Controller Trace Support
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Felipe Balbi <[e-mail]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2  of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#define CREATE_TRACE_POINTS
+#include "trace.h"

drivers/usb/dwc3/trace.h

···
+/**
+ * trace.h - DesignWare USB3 DRD Controller Trace Support
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Felipe Balbi <[e-mail]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2  of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM dwc3
+
+#if !defined(__DWC3_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __DWC3_TRACE_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+#include <asm/byteorder.h>
+#include "core.h"
+#include "debug.h"
+
+DECLARE_EVENT_CLASS(dwc3_log_msg,
+	TP_PROTO(struct va_format *vaf),
+	TP_ARGS(vaf),
+	TP_STRUCT__entry(__dynamic_array(char, msg, DWC3_MSG_MAX)),
+	TP_fast_assign(
+		vsnprintf(__get_str(msg), DWC3_MSG_MAX, vaf->fmt, *vaf->va);
+	),
+	TP_printk("%s", __get_str(msg))
+);
+
+DEFINE_EVENT(dwc3_log_msg, dwc3_readl,
+	TP_PROTO(struct va_format *vaf),
+	TP_ARGS(vaf)
+);
+
+DEFINE_EVENT(dwc3_log_msg, dwc3_writel,
+	TP_PROTO(struct va_format *vaf),
+	TP_ARGS(vaf)
+);
+
+DEFINE_EVENT(dwc3_log_msg, dwc3_ep0,
+	TP_PROTO(struct va_format *vaf),
+	TP_ARGS(vaf)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_event,
+	TP_PROTO(u32 event),
+	TP_ARGS(event),
+	TP_STRUCT__entry(
+		__field(u32, event)
+	),
+	TP_fast_assign(
+		__entry->event = event;
+	),
+	TP_printk("event %08x\n", __entry->event)
+);
+
+DEFINE_EVENT(dwc3_log_event, dwc3_event,
+	TP_PROTO(u32 event),
+	TP_ARGS(event)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_ctrl,
+	TP_PROTO(struct usb_ctrlrequest *ctrl),
+	TP_ARGS(ctrl),
+	TP_STRUCT__entry(
+		__field(struct usb_ctrlrequest *, ctrl)
+	),
+	TP_fast_assign(
+		__entry->ctrl = ctrl;
+	),
+	TP_printk("bRequestType %02x bRequest %02x wValue %04x wIndex %04x wLength %d",
+		__entry->ctrl->bRequestType, __entry->ctrl->bRequest,
+		le16_to_cpu(__entry->ctrl->wValue), le16_to_cpu(__entry->ctrl->wIndex),
+		le16_to_cpu(__entry->ctrl->wLength)
+	)
+);
+
+DEFINE_EVENT(dwc3_log_ctrl, dwc3_ctrl_req,
+	TP_PROTO(struct usb_ctrlrequest *ctrl),
+	TP_ARGS(ctrl)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_request,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req),
+	TP_STRUCT__entry(
+		__field(struct dwc3_request *, req)
+	),
+	TP_fast_assign(
+		__entry->req = req;
+	),
+	TP_printk("%s: req %p length %u/%u ==> %d",
+		__entry->req->dep->name, __entry->req,
+		__entry->req->request.actual, __entry->req->request.length,
+		__entry->req->request.status
+	)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_alloc_request,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_free_request,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_ep_queue,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_ep_dequeue,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DEFINE_EVENT(dwc3_log_request, dwc3_gadget_giveback,
+	TP_PROTO(struct dwc3_request *req),
+	TP_ARGS(req)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_generic_cmd,
+	TP_PROTO(unsigned int cmd, u32 param),
+	TP_ARGS(cmd, param),
+	TP_STRUCT__entry(
+		__field(unsigned int, cmd)
+		__field(u32, param)
+	),
+	TP_fast_assign(
+		__entry->cmd = cmd;
+		__entry->param = param;
+	),
+	TP_printk("cmd '%s' [%d] param %08x\n",
+		dwc3_gadget_generic_cmd_string(__entry->cmd),
+		__entry->cmd, __entry->param
+	)
+);
+
+DEFINE_EVENT(dwc3_log_generic_cmd, dwc3_gadget_generic_cmd,
+	TP_PROTO(unsigned int cmd, u32 param),
+	TP_ARGS(cmd, param)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_gadget_ep_cmd,
+	TP_PROTO(struct dwc3_ep *dep, unsigned int cmd,
+		struct dwc3_gadget_ep_cmd_params *params),
+	TP_ARGS(dep, cmd, params),
+	TP_STRUCT__entry(
+		__field(struct dwc3_ep *, dep)
+		__field(unsigned int, cmd)
+		__field(struct dwc3_gadget_ep_cmd_params *, params)
+	),
+	TP_fast_assign(
+		__entry->dep = dep;
+		__entry->cmd = cmd;
+		__entry->params = params;
+	),
+	TP_printk("%s: cmd '%s' [%d] params %08x %08x %08x\n",
+		__entry->dep->name, dwc3_gadget_ep_cmd_string(__entry->cmd),
+		__entry->cmd, __entry->params->param0,
+		__entry->params->param1, __entry->params->param2
+	)
+);
+
+DEFINE_EVENT(dwc3_log_gadget_ep_cmd, dwc3_gadget_ep_cmd,
+	TP_PROTO(struct dwc3_ep *dep, unsigned int cmd,
+		struct dwc3_gadget_ep_cmd_params *params),
+	TP_ARGS(dep, cmd, params)
+);
+
+DECLARE_EVENT_CLASS(dwc3_log_trb,
+	TP_PROTO(struct dwc3_ep *dep, struct dwc3_trb *trb),
+	TP_ARGS(dep, trb),
+	TP_STRUCT__entry(
+		__field(struct dwc3_ep *, dep)
+		__field(struct dwc3_trb *, trb)
+	),
+	TP_fast_assign(
+		__entry->dep = dep;
+		__entry->trb = trb;
+	),
+	TP_printk("%s: trb %p bph %08x bpl %08x size %08x ctrl %08x\n",
+		__entry->dep->name, __entry->trb, __entry->trb->bph,
+		__entry->trb->bpl, __entry->trb->size, __entry->trb->ctrl
+	)
+);
+
+DEFINE_EVENT(dwc3_log_trb, dwc3_prepare_trb,
+	TP_PROTO(struct dwc3_ep *dep, struct dwc3_trb *trb),
+	TP_ARGS(dep, trb)
+);
+
+DEFINE_EVENT(dwc3_log_trb, dwc3_complete_trb,
+	TP_PROTO(struct dwc3_ep *dep, struct dwc3_trb *trb),
+	TP_ARGS(dep, trb)
+);
+
+#endif /* __DWC3_TRACE_H */
+
+/* this part has to be here */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+#include <trace/define_trace.h>

drivers/usb/gadget/Kconfig

···
 config USB_F_FS
 	tristate
 
+config USB_F_UAC1
+	tristate
+
+config USB_F_UAC2
+	tristate
+
+config USB_F_UVC
+	tristate
+
 choice
 	tristate "USB Gadget Drivers"
 	default USB_ETH

drivers/usb/gadget/Makefile

···
 #
 subdir-ccflags-$(CONFIG_USB_GADGET_DEBUG)	:= -DDEBUG
 subdir-ccflags-$(CONFIG_USB_GADGET_VERBOSE)	+= -DVERBOSE_DEBUG
-ccflags-y				+= -Idrivers/usb/gadget/udc
+ccflags-y				+= -I$(srctree)/drivers/usb/gadget/udc
 
 obj-$(CONFIG_USB_LIBCOMPOSITE)	+= libcomposite.o
 libcomposite-y			:= usbstring.o config.o epautoconf.o

drivers/usb/gadget/composite.c

···
 	.unbind		= composite_unbind,
 
 	.setup		= composite_setup,
+	.reset		= composite_disconnect,
 	.disconnect	= composite_disconnect,
 
 	.suspend	= composite_suspend,

drivers/usb/gadget/configfs.c

···
 	.unbind         = configfs_composite_unbind,
 
 	.setup          = composite_setup,
+	.reset          = composite_disconnect,
 	.disconnect     = composite_disconnect,
 
 	.max_speed	= USB_SPEED_SUPER,

drivers/usb/gadget/function/Makefile

···
 # USB peripheral controller drivers
 #
 
-ccflags-y			:= -Idrivers/usb/gadget/
-ccflags-y			+= -Idrivers/usb/gadget/udc/
+ccflags-y			:= -I$(srctree)/drivers/usb/gadget/
+ccflags-y			+= -I$(srctree)/drivers/usb/gadget/udc/
 
 # USB Functions
 usb_f_acm-y			:= f_acm.o
···
 obj-$(CONFIG_USB_F_MASS_STORAGE)+= usb_f_mass_storage.o
 usb_f_fs-y			:= f_fs.o
 obj-$(CONFIG_USB_F_FS)		+= usb_f_fs.o
+usb_f_uac1-y			:= f_uac1.o u_uac1.o
+obj-$(CONFIG_USB_F_UAC1)	+= usb_f_uac1.o
+usb_f_uac2-y			:= f_uac2.o
+obj-$(CONFIG_USB_F_UAC2)	+= usb_f_uac2.o
+usb_f_uvc-y			:= f_uvc.o uvc_queue.o uvc_v4l2.o uvc_video.o
+obj-$(CONFIG_USB_F_UVC)		+= usb_f_uvc.o

drivers/usb/gadget/function/f_acm.c

···
 	struct usb_composite_dev *cdev = acm->port.func.config->cdev;
 
 	if (req->status != 0) {
-		DBG(cdev, "acm ttyGS%d completion, err %d\n",
-				acm->port_num, req->status);
+		dev_dbg(&cdev->gadget->dev, "acm ttyGS%d completion, err %d\n",
+			acm->port_num, req->status);
 		return;
 	}
 
 	/* normal completion */
 	if (req->actual != sizeof(acm->port_line_coding)) {
-		DBG(cdev, "acm ttyGS%d short resp, len %d\n",
-				acm->port_num, req->actual);
+		dev_dbg(&cdev->gadget->dev, "acm ttyGS%d short resp, len %d\n",
+			acm->port_num, req->actual);
 		usb_ep_set_halt(ep);
 	} else {
 		struct usb_cdc_line_coding	*value = req->buf;
···
 
 	default:
 invalid:
-		VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
-			ctrl->bRequestType, ctrl->bRequest,
-			w_value, w_index, w_length);
+		dev_vdbg(&cdev->gadget->dev,
+			 "invalid control req%02x.%02x v%04x i%04x l%d\n",
+			 ctrl->bRequestType, ctrl->bRequest,
+			 w_value, w_index, w_length);
 	}
 
 	/* respond with data transfer or status phase? */
 	if (value >= 0) {
-		DBG(cdev, "acm ttyGS%d req%02x.%02x v%04x i%04x l%d\n",
+		dev_dbg(&cdev->gadget->dev,
+			"acm ttyGS%d req%02x.%02x v%04x i%04x l%d\n",
 			acm->port_num, ctrl->bRequestType, ctrl->bRequest,
 			w_value, w_index, w_length);
 		req->zero = 0;
···
 
 	if (intf == acm->ctrl_id) {
 		if (acm->notify->driver_data) {
-			VDBG(cdev, "reset acm control interface %d\n", intf);
+			dev_vdbg(&cdev->gadget->dev,
+				 "reset acm control interface %d\n", intf);
 			usb_ep_disable(acm->notify);
 		} else {
-			VDBG(cdev, "init acm ctrl interface %d\n", intf);
+			dev_vdbg(&cdev->gadget->dev,
+				 "init acm ctrl interface %d\n", intf);
 			if (config_ep_by_speed(cdev->gadget, f, acm->notify))
 				return -EINVAL;
 		}
···
 
 	} else if (intf == acm->data_id) {
 		if (acm->port.in->driver_data) {
-			DBG(cdev, "reset acm ttyGS%d\n", acm->port_num);
+			dev_dbg(&cdev->gadget->dev,
+				"reset acm ttyGS%d\n", acm->port_num);
 			gserial_disconnect(&acm->port);
 		}
 		if (!acm->port.in->desc || !acm->port.out->desc) {
-			DBG(cdev, "activate acm ttyGS%d\n", acm->port_num);
+			dev_dbg(&cdev->gadget->dev,
+				"activate acm ttyGS%d\n", acm->port_num);
 			if (config_ep_by_speed(cdev->gadget, f,
 					       acm->port.in) ||
 			    config_ep_by_speed(cdev->gadget, f,
···
 	struct f_acm	*acm = func_to_acm(f);
 	struct usb_composite_dev *cdev = f->config->cdev;
 
-	DBG(cdev, "acm ttyGS%d deactivated\n", acm->port_num);
+	dev_dbg(&cdev->gadget->dev, "acm ttyGS%d deactivated\n", acm->port_num);
 	gserial_disconnect(&acm->port);
 	usb_ep_disable(acm->notify);
 	acm->notify->driver_data = NULL;
···
 
 	spin_lock(&acm->lock);
 	if (acm->notify_req) {
-		DBG(cdev, "acm ttyGS%d serial state %04x\n",
-				acm->port_num, acm->serial_state);
+		dev_dbg(&cdev->gadget->dev, "acm ttyGS%d serial state %04x\n",
+			acm->port_num, acm->serial_state);
 		status = acm_cdc_notify(acm, USB_CDC_NOTIFY_SERIAL_STATE,
 				0, &acm->serial_state, sizeof(acm->serial_state));
 	} else {
···
 	if (status)
 		goto fail;
 
-	DBG(cdev, "acm ttyGS%d: %s speed IN/%s OUT/%s NOTIFY/%s\n",
-			acm->port_num,
-			gadget_is_superspeed(c->cdev->gadget) ? "super" :
-			gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
-			acm->port.in->name, acm->port.out->name,
-			acm->notify->name);
+	dev_dbg(&cdev->gadget->dev,
+		"acm ttyGS%d: %s speed IN/%s OUT/%s NOTIFY/%s\n",
+		acm->port_num,
+		gadget_is_superspeed(c->cdev->gadget) ? "super" :
+		gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
+		acm->port.in->name, acm->port.out->name,
+		acm->notify->name);
 	return 0;
 
 fail:

drivers/usb/gadget/function/f_fs.c

···
 		case FUNCTIONFS_ENDPOINT_REVMAP:
 			ret = epfile->ep->num;
 			break;
+		case FUNCTIONFS_ENDPOINT_DESC:
+		{
+			int desc_idx;
+			struct usb_endpoint_descriptor *desc;
+
+			switch (epfile->ffs->gadget->speed) {
+			case USB_SPEED_SUPER:
+				desc_idx = 2;
+				break;
+			case USB_SPEED_HIGH:
+				desc_idx = 1;
+				break;
+			default:
+				desc_idx = 0;
+			}
+			desc = epfile->ep->descs[desc_idx];
+
+			spin_unlock_irq(&epfile->ffs->eps_lock);
+			ret = copy_to_user((void *)value, desc, sizeof(*desc));
+			if (ret)
+				ret = -EFAULT;
+			return ret;
+		}
 		default:
 			ret = -ENOTTY;
 		}
···
 		epfile->ffs = ffs;
 		mutex_init(&epfile->mutex);
 		init_waitqueue_head(&epfile->wait);
-		sprintf(epfiles->name, "ep%u",  i);
+		if (ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR)
+			sprintf(epfiles->name, "ep%02x", ffs->eps_addrmap[i]);
+		else
+			sprintf(epfiles->name, "ep%u", i);
 		if (!unlikely(ffs_sb_create_file(ffs->sb, epfiles->name, epfile,
 						 &ffs_epfile_operations,
 						 &epfile->dentry))) {
···
 		break;
 	case FUNCTIONFS_DESCRIPTORS_MAGIC_V2:
 		flags = get_unaligned_le32(data + 8);
+		ffs->user_flags = flags;
 		if (flags & ~(FUNCTIONFS_HAS_FS_DESC |
 			      FUNCTIONFS_HAS_HS_DESC |
 			      FUNCTIONFS_HAS_SS_DESC |
-			      FUNCTIONFS_HAS_MS_OS_DESC)) {
+			      FUNCTIONFS_HAS_MS_OS_DESC |
+			      FUNCTIONFS_VIRTUAL_ADDR)) {
 			ret = -ENOSYS;
 			goto error;
 		}
···
 		break;
 
 	default:
-		BUG();
+		WARN(1, "%d: unknown event, this should not happen\n", type);
+		return;
 	}
 
 	{
···
 	struct usb_endpoint_descriptor *ds = (void *)desc;
 	struct ffs_function *func = priv;
 	struct ffs_ep *ffs_ep;
-	unsigned ep_desc_id, idx;
+	unsigned ep_desc_id;
+	int idx;
 	static const char *speed_names[] = { "full", "high", "super" };
 
 	if (type != FFS_DESCRIPTOR)
···
 	} else {
 		struct usb_request *req;
 		struct usb_ep *ep;
+		u8 bEndpointAddress;
 
+		/*
+		 * We back up bEndpointAddress because autoconfig overwrites
+		 * it with physical endpoint address.
+		 */
+		bEndpointAddress = ds->bEndpointAddress;
 		pr_vdebug("autoconfig\n");
 		ep = usb_ep_autoconfig(func->gadget, ds);
 		if (unlikely(!ep))
···
 		ffs_ep->req = req;
 		func->eps_revmap[ds->bEndpointAddress &
 				 USB_ENDPOINT_NUMBER_MASK] = idx + 1;
+		/*
+		 * If we use virtual address mapping, we restore
+		 * original bEndpointAddress value.
+		 */
+		if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR)
+			ds->bEndpointAddress = bEndpointAddress;
 	}
 	ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength);
 
···
 		ret = ffs_func_revmap_ep(func, le16_to_cpu(creq->wIndex));
 		if (unlikely(ret < 0))
 			return ret;
+		if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR)
+			ret = func->ffs->eps_addrmap[ret];
 		break;
 
 	default:

drivers/usb/gadget/function/f_loopback.c

···
 	struct usb_composite_dev	*cdev;
 
 	cdev = loop->function.config->cdev;
-	disable_endpoints(cdev, loop->in_ep, loop->out_ep, NULL, NULL);
+	disable_endpoints(cdev, loop->in_ep, loop->out_ep, NULL, NULL, NULL,
+			NULL);
 	VDBG(cdev, "%s disabled\n", loop->function.name);
 }
 

drivers/usb/gadget/function/f_mass_storage.c

···
 	*pbusy = 1;
 	*state = BUF_STATE_BUSY;
 	spin_unlock_irq(&fsg->common->lock);
+
 	rc = usb_ep_queue(ep, req, GFP_KERNEL);
-	if (rc != 0) {
-		*pbusy = 0;
-		*state = BUF_STATE_EMPTY;
+	if (rc == 0)
+		return;  /* All good, we're done */
 
-		/* We can't do much more than wait for a reset */
+	*pbusy = 0;
+	*state = BUF_STATE_EMPTY;
 
-		/*
-		 * Note: currently the net2280 driver fails zero-length
-		 * submissions if DMA is enabled.
-		 */
-		if (rc != -ESHUTDOWN &&
-		    !(rc == -EOPNOTSUPP && req->length == 0))
-			WARNING(fsg, "error in submission: %s --> %d\n",
-				ep->name, rc);
-	}
+	/* We can't do much more than wait for a reset */
+
+	/*
+	 * Note: currently the net2280 driver fails zero-length
+	 * submissions if DMA is enabled.
+	 */
+	if (rc != -ESHUTDOWN && !(rc == -EOPNOTSUPP && req->length == 0))
+		WARNING(fsg, "error in submission: %s --> %d\n", ep->name, rc);
 }
 
 static bool start_in_transfer(struct fsg_common *common, struct fsg_buffhd *bh)
···
 	cfg->fsg_num_buffers = fsg_num_buffers;
 }
 EXPORT_SYMBOL_GPL(fsg_config_from_params);
-

drivers/usb/gadget/function/f_obex.c

···
 		if (alt != 0)
 			goto fail;
 		/* NOP */
-		DBG(cdev, "reset obex ttyGS%d control\n", obex->port_num);
+		dev_dbg(&cdev->gadget->dev,
+			"reset obex ttyGS%d control\n", obex->port_num);
 
 	} else if (intf == obex->data_id) {
 		if (alt > 1)
 			goto fail;
 
 		if (obex->port.in->driver_data) {
-			DBG(cdev, "reset obex ttyGS%d\n", obex->port_num);
+			dev_dbg(&cdev->gadget->dev,
+				"reset obex ttyGS%d\n", obex->port_num);
 			gserial_disconnect(&obex->port);
 		}
 
 		if (!obex->port.in->desc || !obex->port.out->desc) {
-			DBG(cdev, "init obex ttyGS%d\n", obex->port_num);
+			dev_dbg(&cdev->gadget->dev,
+				"init obex ttyGS%d\n", obex->port_num);
 			if (config_ep_by_speed(cdev->gadget, f,
 					       obex->port.in) ||
 			    config_ep_by_speed(cdev->gadget, f,
···
 		}
 
 		if (alt == 1) {
-			DBG(cdev, "activate obex ttyGS%d\n", obex->port_num);
+			dev_dbg(&cdev->gadget->dev,
+				"activate obex ttyGS%d\n", obex->port_num);
 			gserial_connect(&obex->port, obex->port_num);
 		}
 
···
 	struct f_obex	*obex = func_to_obex(f);
 	struct usb_composite_dev *cdev = f->config->cdev;
 
-	DBG(cdev, "obex ttyGS%d disable\n", obex->port_num);
+	dev_dbg(&cdev->gadget->dev, "obex ttyGS%d disable\n", obex->port_num);
 	gserial_disconnect(&obex->port);
 }
 
···
 
 	status = usb_function_activate(&g->func);
 	if (status)
-		DBG(cdev, "obex ttyGS%d function activate --> %d\n",
+		dev_dbg(&cdev->gadget->dev,
+			"obex ttyGS%d function activate --> %d\n",
 			obex->port_num, status);
 }
 
···
 
 	status = usb_function_deactivate(&g->func);
 	if (status)
-		DBG(cdev, "obex ttyGS%d function deactivate --> %d\n",
+		dev_dbg(&cdev->gadget->dev,
+			"obex ttyGS%d function deactivate --> %d\n",
 			obex->port_num, status);
 }
 
···
 		obex->can_activate = true;
 
 
-	DBG(cdev, "obex ttyGS%d: %s speed IN/%s OUT/%s\n",
-			obex->port_num,
-			gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
-			obex->port.in->name, obex->port.out->name);
+	dev_dbg(&cdev->gadget->dev, "obex ttyGS%d: %s speed IN/%s OUT/%s\n",
+		obex->port_num,
+		gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
+		obex->port.in->name, obex->port.out->name);
 
 	return 0;
 

drivers/usb/gadget/function/f_serial.c

···
 	/* we know alt == 0, so this is an activation or a reset */
 
 	if (gser->port.in->driver_data) {
-		DBG(cdev, "reset generic ttyGS%d\n", gser->port_num);
+		dev_dbg(&cdev->gadget->dev,
+			"reset generic ttyGS%d\n", gser->port_num);
 		gserial_disconnect(&gser->port);
 	}
 	if (!gser->port.in->desc || !gser->port.out->desc) {
-		DBG(cdev, "activate generic ttyGS%d\n", gser->port_num);
+		dev_dbg(&cdev->gadget->dev,
+			"activate generic ttyGS%d\n", gser->port_num);
 		if (config_ep_by_speed(cdev->gadget, f, gser->port.in) ||
 		    config_ep_by_speed(cdev->gadget, f, gser->port.out)) {
 			gser->port.in->desc = NULL;
···
 	struct f_gser	*gser = func_to_gser(f);
 	struct usb_composite_dev *cdev = f->config->cdev;
 
-	DBG(cdev, "generic ttyGS%d deactivated\n", gser->port_num);
+	dev_dbg(&cdev->gadget->dev,
+		"generic ttyGS%d deactivated\n", gser->port_num);
 	gserial_disconnect(&gser->port);
 }
 
···
 			gser_ss_function);
 	if (status)
 		goto fail;
-	DBG(cdev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
-			gser->port_num,
-			gadget_is_superspeed(c->cdev->gadget) ? "super" :
-			gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
-			gser->port.in->name, gser->port.out->name);
+	dev_dbg(&cdev->gadget->dev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
+		gser->port_num,
+		gadget_is_superspeed(c->cdev->gadget) ? "super" :
+		gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
+		gser->port.in->name, gser->port.out->name);
 	return 0;
 
 fail:

drivers/usb/gadget/function/f_sourcesink.c

···
 #include "gadget_chips.h"
 #include "u_f.h"
 
+#define USB_MS_TO_SS_INTERVAL(x) USB_MS_TO_HS_INTERVAL(x)
+
+enum eptype {
+	EP_CONTROL = 0,
+	EP_BULK,
+	EP_ISOC,
+	EP_INTERRUPT,
+};
+
 /*
  * SOURCE/SINK FUNCTION ... a primary testing vehicle for USB peripheral
  * controller drivers.
···
 	struct usb_ep		*out_ep;
 	struct usb_ep		*iso_in_ep;
 	struct usb_ep		*iso_out_ep;
+	struct usb_ep		*int_in_ep;
+	struct usb_ep		*int_out_ep;
 	int			cur_alt;
 };
 
···
 static unsigned isoc_maxpacket;
 static unsigned isoc_mult;
 static unsigned isoc_maxburst;
+static unsigned int_interval; /* In ms */
+static unsigned int_maxpacket;
+static unsigned int_mult;
+static unsigned int_maxburst;
 static unsigned buflen;
 
 /*-------------------------------------------------------------------------*/
···
 
 	.bAlternateSetting =	1,
 	.bNumEndpoints =	4,
+	.bInterfaceClass =	USB_CLASS_VENDOR_SPEC,
+	/* .iInterface		= DYNAMIC */
+};
+
+static struct usb_interface_descriptor source_sink_intf_alt2 = {
+	.bLength =		USB_DT_INTERFACE_SIZE,
+	.bDescriptorType =	USB_DT_INTERFACE,
+
+	.bAlternateSetting =	2,
+	.bNumEndpoints =	2,
 	.bInterfaceClass =	USB_CLASS_VENDOR_SPEC,
 	/* .iInterface		= DYNAMIC */
 };
···
 	.bInterval =		4,
 };
 
+static struct usb_endpoint_descriptor fs_int_source_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_IN,
+	.bmAttributes =		USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize =	cpu_to_le16(64),
+	.bInterval =		GZERO_INT_INTERVAL,
+};
+
+static struct usb_endpoint_descriptor fs_int_sink_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bEndpointAddress =	USB_DIR_OUT,
+	.bmAttributes =		USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize =	cpu_to_le16(64),
+	.bInterval =		GZERO_INT_INTERVAL,
+};
+
 static struct usb_descriptor_header *fs_source_sink_descs[] = {
 	(struct usb_descriptor_header *) &source_sink_intf_alt0,
 	(struct usb_descriptor_header *) &fs_sink_desc,
···
 	(struct usb_descriptor_header *) &fs_source_desc,
 	(struct usb_descriptor_header *) &fs_iso_sink_desc,
 	(struct usb_descriptor_header *) &fs_iso_source_desc,
+	(struct usb_descriptor_header *) &source_sink_intf_alt2,
+#define FS_ALT_IFC_2_OFFSET	8
+	(struct usb_descriptor_header *) &fs_int_sink_desc,
+	(struct usb_descriptor_header *) &fs_int_source_desc,
 	NULL,
 };
 
···
 	.bInterval =		4,
 };
 
+static struct usb_endpoint_descriptor hs_int_source_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bmAttributes =		USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize =	cpu_to_le16(1024),
+	.bInterval =		USB_MS_TO_HS_INTERVAL(GZERO_INT_INTERVAL),
+};
+
+static struct usb_endpoint_descriptor hs_int_sink_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bmAttributes =		USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize =	cpu_to_le16(1024),
+	.bInterval =		USB_MS_TO_HS_INTERVAL(GZERO_INT_INTERVAL),
+};
+
 static struct usb_descriptor_header *hs_source_sink_descs[] = {
 	(struct usb_descriptor_header *) &source_sink_intf_alt0,
 	(struct usb_descriptor_header *) &hs_source_desc,
···
 	(struct usb_descriptor_header *) &hs_sink_desc,
 	(struct usb_descriptor_header *) &hs_iso_source_desc,
 	(struct usb_descriptor_header *) &hs_iso_sink_desc,
+	(struct usb_descriptor_header *) &source_sink_intf_alt2,
+#define HS_ALT_IFC_2_OFFSET	8
+	(struct usb_descriptor_header *) &hs_int_source_desc,
+	(struct usb_descriptor_header *) &hs_int_sink_desc,
 	NULL,
 };
 
···
 	.wBytesPerInterval =	cpu_to_le16(1024),
 };
 
+static struct usb_endpoint_descriptor ss_int_source_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bmAttributes =		USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize =	cpu_to_le16(1024),
+	.bInterval =		USB_MS_TO_SS_INTERVAL(GZERO_INT_INTERVAL),
+};
+
+struct usb_ss_ep_comp_descriptor ss_int_source_comp_desc = {
+	.bLength =		USB_DT_SS_EP_COMP_SIZE,
+	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
+
+	.bMaxBurst =		0,
+	.bmAttributes =		0,
+	.wBytesPerInterval =	cpu_to_le16(1024),
+};
+
+static struct usb_endpoint_descriptor ss_int_sink_desc = {
+	.bLength =		USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType =	USB_DT_ENDPOINT,
+
+	.bmAttributes =		USB_ENDPOINT_XFER_INT,
+	.wMaxPacketSize =	cpu_to_le16(1024),
+	.bInterval =		USB_MS_TO_SS_INTERVAL(GZERO_INT_INTERVAL),
+};
+
+struct usb_ss_ep_comp_descriptor ss_int_sink_comp_desc = {
+	.bLength =		USB_DT_SS_EP_COMP_SIZE,
+	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
+
+	.bMaxBurst =		0,
+	.bmAttributes =		0,
+	.wBytesPerInterval =	cpu_to_le16(1024),
+};
+
 static struct usb_descriptor_header *ss_source_sink_descs[] = {
 	(struct usb_descriptor_header *) &source_sink_intf_alt0,
 	(struct usb_descriptor_header *) &ss_source_desc,
···
 	(struct usb_descriptor_header *) &ss_iso_source_comp_desc,
 	(struct usb_descriptor_header *) &ss_iso_sink_desc,
 	(struct usb_descriptor_header *) &ss_iso_sink_comp_desc,
+	(struct usb_descriptor_header *) &source_sink_intf_alt2,
+#define SS_ALT_IFC_2_OFFSET	14
+	(struct usb_descriptor_header *) &ss_int_source_desc,
+	(struct usb_descriptor_header *) &ss_int_source_comp_desc,
+	(struct usb_descriptor_header *) &ss_int_sink_desc,
+	(struct usb_descriptor_header *) &ss_int_sink_comp_desc,
 	NULL,
 };
 
···
 };
 
 /*-------------------------------------------------------------------------*/
+static const char *get_ep_string(enum eptype ep_type)
+{
+	switch (ep_type) {
+	case EP_ISOC:
+		return "ISOC-";
+	case EP_INTERRUPT:
+		return "INTERRUPT-";
+	case EP_CONTROL:
+		return "CTRL-";
+	case EP_BULK:
+		return "BULK-";
+	default:
+		return "UNKNOWN-";
+	}
+}
 
 static inline struct usb_request *ss_alloc_ep_req(struct usb_ep *ep, int len)
 {
···
 
 void disable_endpoints(struct usb_composite_dev *cdev,
 		struct usb_ep *in, struct usb_ep *out,
-		struct usb_ep *iso_in, struct usb_ep *iso_out)
+		struct usb_ep *iso_in, struct usb_ep *iso_out,
+		struct usb_ep *int_in, struct usb_ep *int_out)
 {
 	disable_ep(cdev, in);
 	disable_ep(cdev, out);
···
 		disable_ep(cdev, iso_in);
 	if (iso_out)
 		disable_ep(cdev, iso_out);
+	if (int_in)
+		disable_ep(cdev, int_in);
+	if (int_out)
+		disable_ep(cdev, int_out);
 }
 
 static int
···
 		return id;
 	source_sink_intf_alt0.bInterfaceNumber = id;
 	source_sink_intf_alt1.bInterfaceNumber = id;
+	source_sink_intf_alt2.bInterfaceNumber = id;
 
 	/* allocate bulk endpoints */
 	ss->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_source_desc);
···
 	if (isoc_maxpacket > 1024)
 		isoc_maxpacket = 1024;
 
+	/* sanity check the interrupt module parameters */
+	if (int_interval < 1)
+		int_interval = 1;
+	if (int_interval > 4096)
+		int_interval = 4096;
+	if (int_mult > 2)
+		int_mult = 2;
+	if (int_maxburst > 15)
+		int_maxburst = 15;
+
+	/* fill in the FS interrupt descriptors from the module parameters */
+	fs_int_source_desc.wMaxPacketSize = int_maxpacket > 64 ?
+						64 : int_maxpacket;
+	fs_int_source_desc.bInterval = int_interval > 255 ?
+						255 : int_interval;
+	fs_int_sink_desc.wMaxPacketSize = int_maxpacket > 64 ?
+						64 : int_maxpacket;
+	fs_int_sink_desc.bInterval = int_interval > 255 ?
+						255 : int_interval;
+
+	/* allocate int endpoints */
+	ss->int_in_ep = usb_ep_autoconfig(cdev->gadget, &fs_int_source_desc);
+	if (!ss->int_in_ep)
+		goto no_int;
+	ss->int_in_ep->driver_data = cdev;	/* claim */
+
+	ss->int_out_ep = usb_ep_autoconfig(cdev->gadget, &fs_int_sink_desc);
+	if (ss->int_out_ep) {
+		ss->int_out_ep->driver_data = cdev;	/* claim */
+	} else {
+		ss->int_in_ep->driver_data = NULL;
+		ss->int_in_ep = NULL;
+no_int:
+		fs_source_sink_descs[FS_ALT_IFC_2_OFFSET] = NULL;
+		hs_source_sink_descs[HS_ALT_IFC_2_OFFSET] = NULL;
+		ss_source_sink_descs[SS_ALT_IFC_2_OFFSET] = NULL;
+	}
+
+	if (int_maxpacket > 1024)
+		int_maxpacket = 1024;
+
 	/* support high speed hardware */
 	hs_source_desc.bEndpointAddress = fs_source_desc.bEndpointAddress;
 	hs_sink_desc.bEndpointAddress = fs_sink_desc.bEndpointAddress;
 
 	/*
-	 * Fill in the HS isoc descriptors from the module parameters.
-	 * We assume that the user knows what they are doing and won't
-	 * give parameters that their UDC doesn't support.
+	 * Fill in the HS isoc and interrupt descriptors from the module
+	 * parameters. We assume that the user knows what they are doing and
+	 * won't give parameters that their UDC doesn't support.
 	 */
 	hs_iso_source_desc.wMaxPacketSize = isoc_maxpacket;
 	hs_iso_source_desc.wMaxPacketSize |= isoc_mult << 11;
···
 	hs_iso_sink_desc.bInterval = isoc_interval;
 	hs_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
 
+	hs_int_source_desc.wMaxPacketSize = int_maxpacket;
+	hs_int_source_desc.wMaxPacketSize |= int_mult << 11;
+	hs_int_source_desc.bInterval = USB_MS_TO_HS_INTERVAL(int_interval);
+	hs_int_source_desc.bEndpointAddress =
+		fs_int_source_desc.bEndpointAddress;
+
+	hs_int_sink_desc.wMaxPacketSize = int_maxpacket;
+	hs_int_sink_desc.wMaxPacketSize |= int_mult << 11;
+	hs_int_sink_desc.bInterval = USB_MS_TO_HS_INTERVAL(int_interval);
+	hs_int_sink_desc.bEndpointAddress = fs_int_sink_desc.bEndpointAddress;
+
 	/* support super speed hardware */
 	ss_source_desc.bEndpointAddress =
 		fs_source_desc.bEndpointAddress;
···
 		fs_sink_desc.bEndpointAddress;
 
 	/*
-	 * Fill in the SS isoc descriptors from the module parameters.
-	 * We assume that the user knows what they are doing and won't
-	 * give parameters that their UDC doesn't support.
+	 * Fill in the SS isoc and interrupt descriptors from the module
+	 * parameters. We assume that the user knows what they are doing and
+	 * won't give parameters that their UDC doesn't support.
 	 */
 	ss_iso_source_desc.wMaxPacketSize = isoc_maxpacket;
 	ss_iso_source_desc.bInterval = isoc_interval;
···
 		isoc_maxpacket * (isoc_mult + 1) * (isoc_maxburst + 1);
 	ss_iso_sink_desc.bEndpointAddress = fs_iso_sink_desc.bEndpointAddress;
 
+	ss_int_source_desc.wMaxPacketSize = int_maxpacket;
+	ss_int_source_desc.bInterval = USB_MS_TO_SS_INTERVAL(int_interval);
+	ss_int_source_comp_desc.bmAttributes = int_mult;
+	ss_int_source_comp_desc.bMaxBurst = int_maxburst;
+	ss_int_source_comp_desc.wBytesPerInterval =
+		int_maxpacket * (int_mult + 1) * (int_maxburst + 1);
+	ss_int_source_desc.bEndpointAddress =
+		fs_int_source_desc.bEndpointAddress;
+
+	ss_int_sink_desc.wMaxPacketSize = int_maxpacket;
+	ss_int_sink_desc.bInterval = USB_MS_TO_SS_INTERVAL(int_interval);
+	ss_int_sink_comp_desc.bmAttributes = int_mult;
+	ss_int_sink_comp_desc.bMaxBurst = int_maxburst;
+	ss_int_sink_comp_desc.wBytesPerInterval =
+		int_maxpacket * (int_mult + 1) * (int_maxburst + 1);
+	ss_int_sink_desc.bEndpointAddress = fs_int_sink_desc.bEndpointAddress;
+
 	ret = usb_assign_descriptors(f, fs_source_sink_descs,
 			hs_source_sink_descs, ss_source_sink_descs);
 	if (ret)
 		return ret;
 
-	DBG(cdev, "%s speed %s: IN/%s, OUT/%s, ISO-IN/%s, ISO-OUT/%s\n",
+	DBG(cdev, "%s speed %s: IN/%s, OUT/%s, ISO-IN/%s, ISO-OUT/%s, "
+			"INT-IN/%s, INT-OUT/%s\n",
 	    (gadget_is_superspeed(c->cdev->gadget) ? "super" :
 	     (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
 			f->name, ss->in_ep->name, ss->out_ep->name,
 			ss->iso_in_ep ? ss->iso_in_ep->name : "<none>",
-			ss->iso_out_ep ? ss->iso_out_ep->name : "<none>");
+			ss->iso_out_ep ? ss->iso_out_ep->name : "<none>",
+			ss->int_in_ep ? ss->int_in_ep->name : "<none>",
+			ss->int_out_ep ? ss->int_out_ep->name : "<none>");
 	return 0;
 }
 
···
 }
 
 static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
-		bool is_iso, int speed)
+		enum eptype ep_type, int speed)
 {
 	struct usb_ep		*ep;
 	struct usb_request	*req;
 	int			i, size, status;
 
 	for (i = 0; i < 8; i++) {
-		if (is_iso) {
+		switch (ep_type) {
+		case EP_ISOC:
 			switch (speed) {
 			case USB_SPEED_SUPER:
 				size = isoc_maxpacket * (isoc_mult + 1) *
···
 			}
 			ep = is_in ? ss->iso_in_ep : ss->iso_out_ep;
 			req = ss_alloc_ep_req(ep, size);
-		} else {
+			break;
+		case EP_INTERRUPT:
+			switch (speed) {
+			case USB_SPEED_SUPER:
+				size = int_maxpacket * (int_mult + 1) *
+						(int_maxburst + 1);
+				break;
+			case USB_SPEED_HIGH:
+				size = int_maxpacket * (int_mult + 1);
+				break;
+			default:
+				size = int_maxpacket > 1023 ?
+						1023 : int_maxpacket;
+				break;
+			}
+			ep = is_in ? ss->int_in_ep : ss->int_out_ep;
+			req = ss_alloc_ep_req(ep, size);
+			break;
+		default:
 			ep = is_in ? ss->in_ep : ss->out_ep;
 			req = ss_alloc_ep_req(ep, 0);
+			break;
 		}
 
 		if (!req)
···
 
 			cdev = ss->function.config->cdev;
 			ERROR(cdev, "start %s%s %s --> %d\n",
-			      is_iso ? "ISO-" : "", is_in ? "IN" : "OUT",
-			      ep->name, status);
+				get_ep_string(ep_type), is_in ? "IN" : "OUT",
+				ep->name, status);
 			free_ep_req(ep, req);
 		}
 
-		if (!is_iso)
+		if (!(ep_type == EP_ISOC))
 			break;
 	}
 
···
 
 	cdev = ss->function.config->cdev;
 	disable_endpoints(cdev, ss->in_ep, ss->out_ep, ss->iso_in_ep,
-			ss->iso_out_ep);
+			ss->iso_out_ep, ss->int_in_ep, ss->int_out_ep);
 	VDBG(cdev, "%s disabled\n", ss->function.name);
 }
 
···
 	int					speed = cdev->gadget->speed;
 	struct usb_ep				*ep;
 
+	if (alt == 2) {
+		/* Configure for periodic interrupt endpoint */
+		ep = ss->int_in_ep;
+		if (ep) {
+			result = config_ep_by_speed(cdev->gadget,
+					&(ss->function), ep);
+			if (result)
+				return result;
+
+			result = usb_ep_enable(ep);
+			if (result < 0)
+				return result;
+
+			ep->driver_data = ss;
+			result = source_sink_start_ep(ss, true, EP_INTERRUPT,
+					speed);
+			if (result < 0) {
+fail1:
+				ep = ss->int_in_ep;
+				if (ep) {
+					usb_ep_disable(ep);
+					ep->driver_data = NULL;
+				}
+				return result;
+			}
+		}
+
+		/*
+		 * one interrupt endpoint reads (sinks) anything OUT (from the
+		 * host)
+		 */
+		ep = ss->int_out_ep;
+		if (ep) {
+			result = config_ep_by_speed(cdev->gadget,
+					&(ss->function), ep);
+			if (result)
+				goto fail1;
+
+			result = usb_ep_enable(ep);
+			if (result < 0)
+				goto fail1;
+
+			ep->driver_data = ss;
+			result = source_sink_start_ep(ss, false, EP_INTERRUPT,
+					speed);
+			if (result < 0) {
+				ep = ss->int_out_ep;
+				usb_ep_disable(ep);
+				ep->driver_data = NULL;
+				goto fail1;
+			}
+		}
+
+		goto out;
+	}
+
 	/* one bulk endpoint writes (sources) zeroes IN (to the host) */
 	ep = ss->in_ep;
 	result = config_ep_by_speed(cdev->gadget, &(ss->function), ep);
···
 		return result;
 	ep->driver_data = ss;
 
-	result = source_sink_start_ep(ss, true, false, speed);
+	result = source_sink_start_ep(ss, true, EP_BULK, speed);
 	if (result < 0) {
 fail:
 		ep = ss->in_ep;
···
 		goto fail;
 	ep->driver_data = ss;
 
-	result = source_sink_start_ep(ss, false, false, speed);
+	result = source_sink_start_ep(ss, false, EP_BULK, speed);
 	if (result < 0) {
 fail2:
 		ep = ss->out_ep;
···
 			goto fail2;
 		ep->driver_data = ss;
 
-		result = source_sink_start_ep(ss, true, true, speed);
+		result = source_sink_start_ep(ss, true, EP_ISOC, speed);
 		if (result < 0) {
 fail3:
 			ep = ss->iso_in_ep;
···
 			goto fail3;
 		ep->driver_data = ss;
 
-		result = source_sink_start_ep(ss, false, true, speed);
+		result = source_sink_start_ep(ss, false, EP_ISOC, speed);
 		if (result < 0) {
 			usb_ep_disable(ep);
 			ep->driver_data = NULL;
 			goto fail3;
 		}
 	}
+
 out:
 	ss->cur_alt = alt;
 
···
 	struct usb_composite_dev	*cdev = f->config->cdev;
 
 	if (ss->in_ep->driver_data)
+		disable_source_sink(ss);
+	else if (alt == 2 && ss->int_in_ep->driver_data)
 		disable_source_sink(ss);
 	return enable_source_sink(cdev, ss, alt);
 }
···
 	isoc_maxpacket = ss_opts->isoc_maxpacket;
 	isoc_mult = ss_opts->isoc_mult;
 	isoc_maxburst = ss_opts->isoc_maxburst;
+	int_interval = ss_opts->int_interval;
+	int_maxpacket = ss_opts->int_maxpacket;
+	int_mult = ss_opts->int_mult;
+	int_maxburst = ss_opts->int_maxburst;
 	buflen = ss_opts->bulk_buflen;
 
 	ss->function.name = "source/sink";
···
 			f_ss_opts_bulk_buflen_show,
 			f_ss_opts_bulk_buflen_store);
 
+static ssize_t f_ss_opts_int_interval_show(struct f_ss_opts *opts, char *page)
+{
+	int result;
+
+	mutex_lock(&opts->lock);
+	result = sprintf(page, "%d", opts->int_interval);
+	mutex_unlock(&opts->lock);
+
+	return result;
+}
+
+static ssize_t f_ss_opts_int_interval_store(struct f_ss_opts *opts,
+				       const char *page, size_t len)
+{
+	int ret;
+	u32 num;
+
+	mutex_lock(&opts->lock);
+	if (opts->refcnt) {
+		ret = -EBUSY;
+		goto end;
+	}
+
+	ret = kstrtou32(page, 0, &num);
+	if (ret)
+		goto end;
+
+	if (num > 4096) {
+		ret = -EINVAL;
+		goto end;
+	}
+
+	opts->int_interval = num;
+	ret = len;
+end:
+	mutex_unlock(&opts->lock);
+	return ret;
+}
+
+static struct f_ss_opts_attribute f_ss_opts_int_interval =
+	__CONFIGFS_ATTR(int_interval, S_IRUGO | S_IWUSR,
+			f_ss_opts_int_interval_show,
+			f_ss_opts_int_interval_store);
+
+static ssize_t f_ss_opts_int_maxpacket_show(struct f_ss_opts *opts, char *page)
+{
+	int result;
+
+	mutex_lock(&opts->lock);
+	result = sprintf(page, "%d", opts->int_maxpacket);
+	mutex_unlock(&opts->lock);
+
+	return result;
+}
+
+static ssize_t f_ss_opts_int_maxpacket_store(struct f_ss_opts *opts,
+				       const char *page, size_t len)
+{
+	int ret;
+	u16 num;
+
+	mutex_lock(&opts->lock);
+	if (opts->refcnt) {
+		ret = -EBUSY;
+		goto end;
+	}
+
+	ret = kstrtou16(page, 0, &num);
+	if (ret)
+		goto end;
+
+	if (num > 1024) {
+		ret = -EINVAL;
+		goto end;
+	}
+
+	opts->int_maxpacket = num;
+	ret = len;
+end:
+	mutex_unlock(&opts->lock);
+	return ret;
+}
+
+static struct f_ss_opts_attribute f_ss_opts_int_maxpacket =
+	__CONFIGFS_ATTR(int_maxpacket, S_IRUGO | S_IWUSR,
+			f_ss_opts_int_maxpacket_show,
+			f_ss_opts_int_maxpacket_store);
+
+static ssize_t f_ss_opts_int_mult_show(struct f_ss_opts *opts, char *page)
+{
+	int result;
+
+	mutex_lock(&opts->lock);
+	result = sprintf(page, "%d", opts->int_mult);
+	mutex_unlock(&opts->lock);
+
+	return result;
+}
+
+static ssize_t f_ss_opts_int_mult_store(struct f_ss_opts *opts,
+				       const char *page, size_t len)
+{
+	int ret;
+	u8 num;
+
+	mutex_lock(&opts->lock);
+	if (opts->refcnt) {
+		ret = -EBUSY;
+		goto end;
+	}
+
+	ret = kstrtou8(page, 0, &num);
+	if (ret)
+		goto end;
+
+	if (num > 2) {
+		ret = -EINVAL;
+		goto end;
+	}
+
+	opts->int_mult = num;
+	ret = len;
+end:
+	mutex_unlock(&opts->lock);
+	return ret;
+}
+
+static struct f_ss_opts_attribute f_ss_opts_int_mult =
+	__CONFIGFS_ATTR(int_mult, S_IRUGO | S_IWUSR,
+			f_ss_opts_int_mult_show,
+			f_ss_opts_int_mult_store);
+
+static ssize_t f_ss_opts_int_maxburst_show(struct f_ss_opts *opts, char *page)
+{
+	int result;
+
+	mutex_lock(&opts->lock);
+	result = sprintf(page, "%d", opts->int_maxburst);
+	mutex_unlock(&opts->lock);
+
+	return result;
+}
+
+static ssize_t f_ss_opts_int_maxburst_store(struct f_ss_opts *opts,
+				       const char *page, size_t len)
+{
+	int ret;
+	u8 num;
+
+	mutex_lock(&opts->lock);
+	if (opts->refcnt) {
+		ret = -EBUSY;
+		goto end;
+	}
+
+	ret = kstrtou8(page, 0, &num);
+	if (ret)
+		goto end;
+
+	if (num > 15) {
+		ret = -EINVAL;
+		goto end;
+	}
+
+	opts->int_maxburst = num;
+	ret = len;
+end:
+	mutex_unlock(&opts->lock);
+	return ret;
+}
+
+static struct f_ss_opts_attribute f_ss_opts_int_maxburst =
+	__CONFIGFS_ATTR(int_maxburst, S_IRUGO | S_IWUSR,
+			f_ss_opts_int_maxburst_show,
+			f_ss_opts_int_maxburst_store);
+
 static struct configfs_attribute *ss_attrs[] = {
 	&f_ss_opts_pattern.attr,
 	&f_ss_opts_isoc_interval.attr,
···
 	&f_ss_opts_isoc_mult.attr,
 	&f_ss_opts_isoc_maxburst.attr,
 	&f_ss_opts_bulk_buflen.attr,
+	&f_ss_opts_int_interval.attr,
+	&f_ss_opts_int_maxpacket.attr,
+	&f_ss_opts_int_mult.attr,
+	&f_ss_opts_int_maxburst.attr,
 	NULL,
 };
 
···
 	ss_opts->isoc_interval = GZERO_ISOC_INTERVAL;
 	ss_opts->isoc_maxpacket = GZERO_ISOC_MAXPACKET;
 	ss_opts->bulk_buflen = GZERO_BULK_BUFLEN;
+	ss_opts->int_interval = GZERO_INT_INTERVAL;
+	ss_opts->int_maxpacket = GZERO_INT_MAXPACKET;
 
 	config_group_init_type_name(&ss_opts->func_inst.group, "",
 				    &ss_func_type);

drivers/usb/gadget/function/f_uac1.c

···
 
 #include <linux/slab.h>
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/device.h>
 #include <linux/atomic.h>
 
 #include "u_uac1.h"
-
-#define OUT_EP_MAX_PACKET_SIZE	200
-static int req_buf_size = OUT_EP_MAX_PACKET_SIZE;
-module_param(req_buf_size, int, S_IRUGO);
-MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
-
-static int req_count = 256;
-module_param(req_count, int, S_IRUGO);
-MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
-
-static int audio_buf_size = 48000;
-module_param(audio_buf_size, int, S_IRUGO);
-MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
 
 static int generic_set_cmd(struct usb_audio_control *con, u8 cmd, int value);
 static int generic_get_cmd(struct usb_audio_control *con, u8 cmd);
···
 #define F_AUDIO_NUM_INTERFACES	2
 
 /* B.3.1  Standard AC Interface Descriptor */
-static struct usb_interface_descriptor ac_interface_desc __initdata = {
+static struct usb_interface_descriptor ac_interface_desc = {
 	.bLength =		USB_DT_INTERFACE_SIZE,
 	.bDescriptorType =	USB_DT_INTERFACE,
 	.bNumEndpoints =	0,
···
 	.bEndpointAddress =	USB_DIR_OUT,
 	.bmAttributes =		USB_ENDPOINT_SYNC_ADAPTIVE
 				| USB_ENDPOINT_XFER_ISOC,
-	.wMaxPacketSize =	__constant_cpu_to_le16(OUT_EP_MAX_PACKET_SIZE),
+	.wMaxPacketSize	=	cpu_to_le16(UAC1_OUT_EP_MAX_PACKET_SIZE),
 	.bInterval =		4,
 };
 
 /* Class-specific AS ISO OUT Endpoint Descriptor */
-static struct uac_iso_endpoint_descriptor as_iso_out_desc __initdata = {
+static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
 	.bLength =		UAC_ISO_ENDPOINT_DESC_SIZE,
 	.bDescriptorType =	USB_DT_CS_ENDPOINT,
 	.bDescriptorSubtype =	UAC_EP_GENERAL,
···
 	.wLockDelay =		__constant_cpu_to_le16(1),
 };
 
-static struct usb_descriptor_header *f_audio_desc[] __initdata = {
+static struct usb_descriptor_header *f_audio_desc[] = {
 	(struct usb_descriptor_header *)&ac_interface_desc,
 	(struct usb_descriptor_header *)&ac_header_desc,
 
···
 
 	(struct usb_descriptor_header *)&as_out_ep_desc,
 	(struct usb_descriptor_header *)&as_iso_out_desc,
+	NULL,
+};
+
+enum {
+	STR_AC_IF,
+	STR_INPUT_TERMINAL,
+	STR_INPUT_TERMINAL_CH_NAMES,
+	STR_FEAT_DESC_0,
+	STR_OUTPUT_TERMINAL,
+	STR_AS_IF_ALT0,
+	STR_AS_IF_ALT1,
+};
+
+static struct usb_string strings_uac1[] = {
+	[STR_AC_IF].s = "AC Interface",
+	[STR_INPUT_TERMINAL].s = "Input terminal",
+	[STR_INPUT_TERMINAL_CH_NAMES].s = "Channels",
+	[STR_FEAT_DESC_0].s = "Volume control & mute",
+	[STR_OUTPUT_TERMINAL].s = "Output terminal",
+	[STR_AS_IF_ALT0].s = "AS Interface",
+	[STR_AS_IF_ALT1].s = "AS Interface",
+	{ },
+};
+
+static struct usb_gadget_strings str_uac1 = {
+	.language = 0x0409,	/* en-us */
+	.strings = strings_uac1,
+};
+
+static struct usb_gadget_strings *uac1_strings[] = {
+	&str_uac1,
 	NULL,
 };
 
···
 	struct f_audio *audio = req->context;
 	struct usb_composite_dev *cdev = audio->card.func.config->cdev;
 	struct f_audio_buf *copy_buf = audio->copy_buf;
+	struct f_uac1_opts *opts;
+	int audio_buf_size;
 	int err;
+
+	opts = container_of(audio->card.func.fi, struct f_uac1_opts,
+			    func_inst);
+	audio_buf_size = opts->audio_buf_size;
 
 	if (!copy_buf)
 		return -EINVAL;
···
 	struct usb_composite_dev *cdev = f->config->cdev;
 	struct usb_ep *out_ep = audio->out_ep;
 	struct usb_request *req;
+	struct f_uac1_opts *opts;
+	int req_buf_size, req_count, audio_buf_size;
 	int i = 0, err = 0;
 
 	DBG(cdev, "intf %d, alt %d\n", intf, alt);
+
+	opts = container_of(f->fi, struct f_uac1_opts, func_inst);
+	req_buf_size = opts->req_buf_size;
+	req_count = opts->req_count;
+	audio_buf_size = opts->audio_buf_size;
 
 	if (intf == 1) {
 		if (alt == 1) {
···
 }
 
 /* audio function driver setup/binding */
-static int __init
+static int
 f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 {
 	struct usb_composite_dev *cdev = c->cdev;
 	struct f_audio		*audio = func_to_audio(f);
+	struct usb_string	*us;
 	int			status;
 	struct usb_ep		*ep = NULL;
+	struct f_uac1_opts	*audio_opts;
+
+	audio_opts = container_of(f->fi, struct f_uac1_opts, func_inst);
+	audio->card.gadget = c->cdev->gadget;
+	audio_opts->card = &audio->card;
+	/* set up ASLA audio devices */
+	if (!audio_opts->bound) {
+		status = gaudio_setup(&audio->card);
+		if (status < 0)
+			return status;
+		audio_opts->bound = true;
+	}
+	us = usb_gstrings_attach(cdev, uac1_strings, ARRAY_SIZE(strings_uac1));
+	if (IS_ERR(us))
+		return PTR_ERR(us);
+	ac_interface_desc.iInterface = us[STR_AC_IF].id;
+	input_terminal_desc.iTerminal = us[STR_INPUT_TERMINAL].id;
+	input_terminal_desc.iChannelNames = us[STR_INPUT_TERMINAL_CH_NAMES].id;
+	feature_unit_desc.iFeature = us[STR_FEAT_DESC_0].id;
+	output_terminal_desc.iTerminal = us[STR_OUTPUT_TERMINAL].id;
+	as_interface_alt_0_desc.iInterface = us[STR_AS_IF_ALT0].id;
+	as_interface_alt_1_desc.iInterface = us[STR_AS_IF_ALT1].id;
+
 
 	f_audio_build_desc(audio);
 
···
 	return 0;
 
 fail:
+	gaudio_cleanup(&audio->card);
 	if (ep)
 		ep->driver_data = NULL;
 	return status;
-}
-
-static void
-f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
-{
-	struct f_audio		*audio = func_to_audio(f);
-
-	usb_free_all_descriptors(f);
-	kfree(audio);
 }
 
 /*-------------------------------------------------------------------------*/
···
 }
 
 /* Todo: add more control selecotor dynamically */
-static int __init control_selector_init(struct f_audio *audio)
+static int control_selector_init(struct f_audio *audio)
 {
 	INIT_LIST_HEAD(&audio->cs);
 	list_add(&feature_unit.list, &audio->cs);
···
 	return 0;
 }
 
-/**
- * audio_bind_config - add USB audio function to a configuration
- * @c: the configuration to supcard the USB audio function
- * Context: single threaded during gadget setup
- *
- * Returns zero on success, else negative errno.
- */
-static int __init audio_bind_config(struct usb_configuration *c)
+static inline struct f_uac1_opts *to_f_uac1_opts(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct f_uac1_opts,
+			    func_inst.group);
+}
+
+CONFIGFS_ATTR_STRUCT(f_uac1_opts);
+CONFIGFS_ATTR_OPS(f_uac1_opts);
+
+static void f_uac1_attr_release(struct config_item *item)
+{
+	struct f_uac1_opts *opts = to_f_uac1_opts(item);
+
+	usb_put_function_instance(&opts->func_inst);
+}
+
+static struct configfs_item_operations f_uac1_item_ops = {
+	.release	= f_uac1_attr_release,
+	.show_attribute	= f_uac1_opts_attr_show,
+	.store_attribute = f_uac1_opts_attr_store,
+};
+
+#define UAC1_INT_ATTRIBUTE(name)					\
+static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts,	\
+					 char *page)			\
+{									\
+	int result;							\
+									\
+	mutex_lock(&opts->lock);					\
+	result = sprintf(page, "%u\n", opts->name);			\
+	mutex_unlock(&opts->lock);					\
+									\
+	return result;							\
+}									\
+									\
+static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts,	\
+					  const char *page, size_t len)	\
+{									\
+	int ret;							\
+	u32 num;							\
+									\
+	mutex_lock(&opts->lock);					\
+	if (opts->refcnt) {						\
+		ret = -EBUSY;						\
+		goto end;						\
+	}								\
+									\
+	ret = kstrtou32(page, 0, &num);					\
+	if (ret)							\
+		goto end;						\
+									\
+	opts->name = num;						\
+	ret = len;							\
+									\
+end:									\
+	mutex_unlock(&opts->lock);					\
+	return ret;							\
+}									\
+									\
+static struct f_uac1_opts_attribute f_uac1_opts_##name =		\
+	__CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR,			\
+			f_uac1_opts_##name##_show,			\
+			f_uac1_opts_##name##_store)
+
+UAC1_INT_ATTRIBUTE(req_buf_size);
+UAC1_INT_ATTRIBUTE(req_count);
+UAC1_INT_ATTRIBUTE(audio_buf_size);
+
+#define UAC1_STR_ATTRIBUTE(name)					\
+static ssize_t f_uac1_opts_##name##_show(struct f_uac1_opts *opts,	\
+					 char *page)			\
+{									\
+	int result;							\
+									\
+	mutex_lock(&opts->lock);					\
+	result = sprintf(page, "%s\n", opts->name);			\
+	mutex_unlock(&opts->lock);					\
+									\
+	return result;							\
+}									\
+									\
+static ssize_t f_uac1_opts_##name##_store(struct f_uac1_opts *opts,	\
+					  const char *page, size_t len)	\
+{									\
+	int ret = -EBUSY;						\
+	char *tmp;							\
+									\
+	mutex_lock(&opts->lock);					\
+	if (opts->refcnt)						\
+		goto end;						\
+									\
+	tmp = kstrndup(page, len, GFP_KERNEL);				\
+	if (tmp) {							\
+		ret = -ENOMEM;						\
+		goto end;						\
+	}								\
+	if (opts->name##_alloc)						\
+		kfree(opts->name);					\
+	opts->name##_alloc = true;					\
+	opts->name = tmp;						\
+	ret = len;							\
+									\
+end:									\
+	mutex_unlock(&opts->lock);					\
+	return ret;							\
+}									\
+									\
+static struct f_uac1_opts_attribute f_uac1_opts_##name =		\
+	__CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR,			\
+			f_uac1_opts_##name##_show,			\
+			f_uac1_opts_##name##_store)
+
+UAC1_STR_ATTRIBUTE(fn_play);
+UAC1_STR_ATTRIBUTE(fn_cap);
+UAC1_STR_ATTRIBUTE(fn_cntl);
+
+static struct configfs_attribute *f_uac1_attrs[] = {
+	&f_uac1_opts_req_buf_size.attr,
+	&f_uac1_opts_req_count.attr,
+	&f_uac1_opts_audio_buf_size.attr,
+	&f_uac1_opts_fn_play.attr,
+	&f_uac1_opts_fn_cap.attr,
+	&f_uac1_opts_fn_cntl.attr,
+	NULL,
+};
+
+static struct config_item_type f_uac1_func_type = {
+	.ct_item_ops	= &f_uac1_item_ops,
+	.ct_attrs	= f_uac1_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+static void f_audio_free_inst(struct usb_function_instance *f)
+{
+	struct f_uac1_opts *opts;
+
+	opts = container_of(f, struct f_uac1_opts, func_inst);
+	gaudio_cleanup(opts->card);
+	if (opts->fn_play_alloc)
+		kfree(opts->fn_play);
+	if (opts->fn_cap_alloc)
+		kfree(opts->fn_cap);
+	if (opts->fn_cntl_alloc)
+		kfree(opts->fn_cntl);
+	kfree(opts);
+}
+
+static struct usb_function_instance *f_audio_alloc_inst(void)
+{
+	struct f_uac1_opts *opts;
+
+	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+	if (!opts)
+		return ERR_PTR(-ENOMEM);
+
+	mutex_init(&opts->lock);
+	opts->func_inst.free_func_inst = f_audio_free_inst;
+
+	config_group_init_type_name(&opts->func_inst.group, "",
+				    &f_uac1_func_type);
+
+	opts->req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
+	opts->req_count = UAC1_REQ_COUNT;
+	opts->audio_buf_size = UAC1_AUDIO_BUF_SIZE;
+	opts->fn_play = FILE_PCM_PLAYBACK;
+	opts->fn_cap = FILE_PCM_CAPTURE;
+	opts->fn_cntl = FILE_CONTROL;
+	return &opts->func_inst;
+}
+
+static void f_audio_free(struct usb_function *f)
+{
+	struct f_audio *audio = func_to_audio(f);
+	struct f_uac1_opts *opts;
+
+	opts = container_of(f->fi, struct f_uac1_opts, func_inst);
+	kfree(audio);
+	mutex_lock(&opts->lock);
+	--opts->refcnt;
+	mutex_unlock(&opts->lock);
+}
+
+static void f_audio_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	usb_free_all_descriptors(f);
+}
+
+static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
 {
 	struct f_audio *audio;
-	int status;
+	struct f_uac1_opts *opts;
 
 	/* allocate and initialize one new instance */
-	audio = kzalloc(sizeof *audio, GFP_KERNEL);
+	audio = kzalloc(sizeof(*audio), GFP_KERNEL);
 	if (!audio)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	audio->card.func.name = "g_audio";
-	audio->card.gadget = c->cdev->gadget;
 
+	opts = container_of(fi, struct f_uac1_opts, func_inst);
+	mutex_lock(&opts->lock);
+	++opts->refcnt;
+	mutex_unlock(&opts->lock);
 	INIT_LIST_HEAD(&audio->play_queue);
 	spin_lock_init(&audio->lock);
 
-	/* set up ASLA audio devices */
-	status = gaudio_setup(&audio->card);
-	if (status < 0)
-		goto setup_fail;
-
-	audio->card.func.strings = audio_strings;
 	audio->card.func.bind = f_audio_bind;
 	audio->card.func.unbind = f_audio_unbind;
 	audio->card.func.set_alt = f_audio_set_alt;
 	audio->card.func.setup = f_audio_setup;
 	audio->card.func.disable = f_audio_disable;
+	audio->card.func.free_func = f_audio_free;
 
 	control_selector_init(audio);
 
 	INIT_WORK(&audio->playback_work, f_audio_playback_work);
 
-	status = usb_add_function(c, &audio->card.func);
-	if (status)
-		goto add_fail;
-
-	INFO(c->cdev, "audio_buf_size %d, req_buf_size %d, req_count %d\n",
-		audio_buf_size, req_buf_size, req_count);
-
-	return status;
-
-add_fail:
-	gaudio_cleanup();
-setup_fail:
-	kfree(audio);
-	return status;
+	return &audio->card.func;
 }
+
+DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bryan Wu");

drivers/usb/gadget/function/f_uac2.c

···
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 
-/* Playback(USB-IN) Default Stereo - Fl/Fr */
-static int p_chmask = 0x3;
-module_param(p_chmask, uint, S_IRUGO);
-MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
-
-/* Playback Default 48 KHz */
-static int p_srate = 48000;
-module_param(p_srate, uint, S_IRUGO);
-MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
-
-/* Playback Default 16bits/sample */
-static int p_ssize = 2;
-module_param(p_ssize, uint, S_IRUGO);
-MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
-
-/* Capture(USB-OUT) Default Stereo - Fl/Fr */
-static int c_chmask = 0x3;
-module_param(c_chmask, uint, S_IRUGO);
-MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
-
-/* Capture Default 64 KHz */
-static int c_srate = 64000;
-module_param(c_srate, uint, S_IRUGO);
-MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
-
-/* Capture Default 16bits/sample */
-static int c_ssize = 2;
-module_param(c_ssize, uint, S_IRUGO);
-MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
+#include "u_uac2.h"
 
 /* Keep everyone on toes */
 #define USB_XFERS	2
···
 
 	struct snd_card *card;
 	struct snd_pcm *pcm;
+
+	/* timekeeping for the playback endpoint */
+	unsigned int p_interval;
+	unsigned int p_residue;
+
+	/* pre-calculated values for playback iso completion */
+	unsigned int p_pktsize;
+	unsigned int p_pktsize_residue;
+	unsigned int p_framesize;
 };
 
 #define BUFF_SIZE_MAX	(PAGE_SIZE * 16)
···
 	struct snd_uac2_chip uac2;
 };
 
-static struct audio_dev *agdev_g;
-
 static inline
 struct audio_dev *func_to_agdev(struct usb_function *f)
 {
···
 struct snd_uac2_chip *pdev_to_uac2(struct platform_device *p)
 {
 	return container_of(p, struct snd_uac2_chip, pdev);
+}
+
+static inline
+struct f_uac2_opts *agdev_to_uac2_opts(struct audio_dev *agdev)
+{
+	return container_of(agdev->func.fi, struct f_uac2_opts, func_inst);
 }
 
 static inline
···
 {
 	unsigned pending;
 	unsigned long flags;
+	unsigned int hw_ptr;
 	bool update_alsa = false;
-	unsigned char *src, *dst;
 	int status = req->status;
 	struct uac2_req *ur = req->context;
 	struct snd_pcm_substream *substream;
···
 	spin_lock_irqsave(&prm->lock, flags);
 
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
-		src = prm->dma_area + prm->hw_ptr;
+		/*
+		 * For each IN packet, take the quotient of the current data
+		 * rate and the endpoint's interval as the base packet size.
+		 * If there is a residue from this division, add it to the
+		 * residue accumulator.
+		 */
+		req->length = uac2->p_pktsize;
+		uac2->p_residue += uac2->p_pktsize_residue;
+
+		/*
+		 * Whenever there are more bytes in the accumulator than we
+		 * need to add one more sample frame, increase this packet's
+		 * size and decrease the accumulator.
+		 */
+		if (uac2->p_residue / uac2->p_interval >= uac2->p_framesize) {
+			req->length += uac2->p_framesize;
+			uac2->p_residue -= uac2->p_framesize *
+					   uac2->p_interval;
+		}
+
 		req->actual = req->length;
-		dst = req->buf;
-	} else {
-		dst = prm->dma_area + prm->hw_ptr;
-		src = req->buf;
 	}
 
 	pending = prm->hw_ptr % prm->period_size;
···
 	if (pending >= prm->period_size)
 		update_alsa = true;
 
+	hw_ptr = prm->hw_ptr;
 	prm->hw_ptr = (prm->hw_ptr + req->actual) % prm->dma_bytes;
 
 	spin_unlock_irqrestore(&prm->lock, flags);
 
 	/* Pack USB load in ALSA ring buffer */
-	memcpy(dst, src, req->actual);
+	pending = prm->dma_bytes - hw_ptr;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		if (unlikely(pending < req->actual)) {
+			memcpy(req->buf, prm->dma_area + hw_ptr, pending);
+			memcpy(req->buf + pending, prm->dma_area,
+			       req->actual - pending);
+		} else {
+			memcpy(req->buf, prm->dma_area + hw_ptr, req->actual);
+		}
+	} else {
+		if (unlikely(pending < req->actual)) {
+			memcpy(prm->dma_area + hw_ptr, req->buf, pending);
+			memcpy(prm->dma_area, req->buf + pending,
+			       req->actual - pending);
+		} else {
+			memcpy(prm->dma_area + hw_ptr, req->buf, req->actual);
+		}
+	}
+
 exit:
 	if (usb_ep_queue(ep, req, GFP_ATOMIC))
 		dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
···
 {
 	struct snd_uac2_chip *uac2 = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct audio_dev *audio_dev;
+	struct f_uac2_opts *opts;
+	int p_ssize, c_ssize;
+	int p_srate, c_srate;
+	int p_chmask, c_chmask;
+
+	audio_dev = uac2_to_agdev(uac2);
+	opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
+	p_ssize = opts->p_ssize;
+	c_ssize = opts->c_ssize;
+	p_srate = opts->p_srate;
+	c_srate = opts->c_srate;
+	p_chmask = opts->p_chmask;
+	c_chmask = opts->c_chmask;
+	uac2->p_residue = 0;
 
 	runtime->hw = uac2_pcm_hardware;
 
···
 	struct snd_uac2_chip *uac2 = pdev_to_uac2(pdev);
 	struct snd_card *card;
 	struct snd_pcm *pcm;
+	struct audio_dev *audio_dev;
+	struct f_uac2_opts *opts;
 	int err;
+	int p_chmask, c_chmask;
+
+	audio_dev = uac2_to_agdev(uac2);
+	opts = container_of(audio_dev->func.fi, struct f_uac2_opts, func_inst);
+	p_chmask = opts->p_chmask;
+	c_chmask = opts->c_chmask;
 
 	/* Choose any slot, with no id */
 	err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card);
···
 			"%s:%d Error!\n", __func__, __LINE__);
 }
 
-static int __init
+static int
 afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 {
 	struct audio_dev *agdev = func_to_agdev(fn);
 	struct snd_uac2_chip *uac2 = &agdev->uac2;
 	struct usb_composite_dev *cdev = cfg->cdev;
 	struct usb_gadget *gadget = cdev->gadget;
+	struct device *dev = &uac2->pdev.dev;
 	struct uac2_rtd_params *prm;
+	struct f_uac2_opts *uac2_opts;
+	struct usb_string *us;
 	int ret;
+
+	uac2_opts = container_of(fn->fi, struct f_uac2_opts, func_inst);
+
+	us = usb_gstrings_attach(cdev, fn_strings, ARRAY_SIZE(strings_fn));
+	if (IS_ERR(us))
+		return PTR_ERR(us);
+	iad_desc.iFunction = us[STR_ASSOC].id;
+	std_ac_if_desc.iInterface = us[STR_IF_CTRL].id;
+	in_clk_src_desc.iClockSource = us[STR_CLKSRC_IN].id;
+	out_clk_src_desc.iClockSource = us[STR_CLKSRC_OUT].id;
+	usb_out_it_desc.iTerminal = us[STR_USB_IT].id;
+	io_in_it_desc.iTerminal = us[STR_IO_IT].id;
+	usb_in_ot_desc.iTerminal = us[STR_USB_OT].id;
+	io_out_ot_desc.iTerminal = us[STR_IO_OT].id;
+	std_as_out_if0_desc.iInterface = us[STR_AS_OUT_ALT0].id;
+	std_as_out_if1_desc.iInterface = us[STR_AS_OUT_ALT1].id;
+	std_as_in_if0_desc.iInterface = us[STR_AS_IN_ALT0].id;
+	std_as_in_if1_desc.iInterface = us[STR_AS_IN_ALT1].id;
+
+
+	/* Initialize the configurable parameters */
+	usb_out_it_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
+	usb_out_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
+	io_in_it_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
+	io_in_it_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
+	as_out_hdr_desc.bNrChannels = num_channels(uac2_opts->c_chmask);
+	as_out_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->c_chmask);
+	as_in_hdr_desc.bNrChannels = num_channels(uac2_opts->p_chmask);
+	as_in_hdr_desc.bmChannelConfig = cpu_to_le32(uac2_opts->p_chmask);
+	as_out_fmt1_desc.bSubslotSize = uac2_opts->c_ssize;
+	as_out_fmt1_desc.bBitResolution = uac2_opts->c_ssize * 8;
+	as_in_fmt1_desc.bSubslotSize = uac2_opts->p_ssize;
+	as_in_fmt1_desc.bBitResolution = uac2_opts->p_ssize * 8;
+
+	snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", uac2_opts->p_srate);
+	snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", uac2_opts->c_srate);
 
 	ret = usb_interface_id(cfg, fn);
 	if (ret < 0) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
+		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 		return ret;
 	}
 	std_ac_if_desc.bInterfaceNumber = ret;
···
 
 	ret = usb_interface_id(cfg, fn);
 	if (ret < 0) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
+		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 		return ret;
 	}
 	std_as_out_if0_desc.bInterfaceNumber = ret;
···
 
 	ret = usb_interface_id(cfg, fn);
 	if (ret < 0) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
+		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 		return ret;
 	}
 	std_as_in_if0_desc.bInterfaceNumber = ret;
···
 
 	agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
 	if (!agdev->out_ep) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
+		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 		goto err;
 	}
 	agdev->out_ep->driver_data = agdev;
 
 	agdev->in_ep = usb_ep_autoconfig(gadget, &fs_epin_desc);
 	if (!agdev->in_ep) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
+		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 		goto err;
 	}
 	agdev->in_ep->driver_data = agdev;
···
 	return -EINVAL;
 }
 
-static void
-afunc_unbind(struct usb_configuration *cfg, struct usb_function *fn)
-{
-	struct audio_dev *agdev = func_to_agdev(fn);
-	struct uac2_rtd_params *prm;
-
-	alsa_uac2_exit(agdev);
-
-	prm = &agdev->uac2.p_prm;
-	kfree(prm->rbuf);
-
-	prm = &agdev->uac2.c_prm;
-	kfree(prm->rbuf);
-	usb_free_all_descriptors(fn);
-
-	if (agdev->in_ep)
-		agdev->in_ep->driver_data = NULL;
-	if (agdev->out_ep)
-		agdev->out_ep->driver_data = NULL;
-}
-
 static int
 afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
 {
···
 	struct audio_dev *agdev = func_to_agdev(fn);
 	struct snd_uac2_chip *uac2 = &agdev->uac2;
 	struct usb_gadget *gadget = cdev->gadget;
+	struct device *dev = &uac2->pdev.dev;
 	struct usb_request *req;
 	struct usb_ep *ep;
 	struct uac2_rtd_params *prm;
-	int i;
+	int req_len, i;
 
 	/* No i/f has more than 2 alt settings */
 	if (alt > 1) {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
+		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 		return -EINVAL;
 	}
 
 	if (intf == agdev->ac_intf) {
 		/* Control I/f has only 1 AltSetting - 0 */
 		if (alt) {
-			dev_err(&uac2->pdev.dev,
-				"%s:%d Error!\n", __func__, __LINE__);
+			dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 			return -EINVAL;
 		}
 		return 0;
···
 		prm = &uac2->c_prm;
 		config_ep_by_speed(gadget, fn, ep);
 		agdev->as_out_alt = alt;
+		req_len = prm->max_psize;
 	} else if (intf == agdev->as_in_intf) {
+		struct f_uac2_opts *opts = agdev_to_uac2_opts(agdev);
+		unsigned int factor, rate;
+		struct usb_endpoint_descriptor *ep_desc;
+
 		ep = agdev->in_ep;
 		prm = &uac2->p_prm;
 		config_ep_by_speed(gadget, fn, ep);
 		agdev->as_in_alt = alt;
+
+		/* pre-calculate the playback endpoint's interval */
+		if (gadget->speed == USB_SPEED_FULL) {
+			ep_desc = &fs_epin_desc;
+			factor = 1000;
+		} else {
+			ep_desc = &hs_epin_desc;
+			factor = 125;
+		}
+
+		/* pre-compute some values for iso_complete() */
+		uac2->p_framesize = opts->p_ssize *
+				    num_channels(opts->p_chmask);
+		rate = opts->p_srate * uac2->p_framesize;
+		uac2->p_interval = (1 << (ep_desc->bInterval - 1)) * factor;
+		uac2->p_pktsize = min_t(unsigned int, rate / uac2->p_interval,
+					prm->max_psize);
+
+		if (uac2->p_pktsize < prm->max_psize)
+			uac2->p_pktsize_residue = rate % uac2->p_interval;
+		else
+			uac2->p_pktsize_residue = 0;
+
+		req_len = uac2->p_pktsize;
+		uac2->p_residue = 0;
 	} else {
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
+		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 		return -EINVAL;
 	}
 
···
 	usb_ep_enable(ep);
 
 	for (i = 0; i < USB_XFERS; i++) {
-		if (prm->ureq[i].req) {
-			if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
-				dev_err(&uac2->pdev.dev, "%d Error!\n",
-					__LINE__);
-			continue;
+		if (!prm->ureq[i].req) {
+			req = usb_ep_alloc_request(ep, GFP_ATOMIC);
+			if (req == NULL)
+				return -ENOMEM;
+
+			prm->ureq[i].req = req;
+			prm->ureq[i].pp = prm;
+
+			req->zero = 0;
+			req->context = &prm->ureq[i];
+			req->length = req_len;
+			req->complete = agdev_iso_complete;
+			req->buf = prm->rbuf + i * prm->max_psize;
 		}
 
-		req = usb_ep_alloc_request(ep, GFP_ATOMIC);
-		if (req == NULL) {
-			dev_err(&uac2->pdev.dev,
-				"%s:%d Error!\n", __func__, __LINE__);
-			return -EINVAL;
-		}
-
-		prm->ureq[i].req = req;
-		prm->ureq[i].pp = prm;
-
-		req->zero = 0;
-		req->context = &prm->ureq[i];
-		req->length = prm->max_psize;
-		req->complete =	agdev_iso_complete;
-		req->buf = prm->rbuf + i * req->length;
-
-		if (usb_ep_queue(ep, req, GFP_ATOMIC))
-			dev_err(&uac2->pdev.dev, "%d Error!\n", __LINE__);
+		if (usb_ep_queue(ep, prm->ureq[i].req, GFP_ATOMIC))
+			dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
 	}
 
 	return 0;
···
 	struct usb_request *req = fn->config->cdev->req;
 	struct audio_dev *agdev = func_to_agdev(fn);
 	struct snd_uac2_chip *uac2 = &agdev->uac2;
+	struct f_uac2_opts *opts;
 	u16 w_length = le16_to_cpu(cr->wLength);
 	u16 w_index = le16_to_cpu(cr->wIndex);
 	u16 w_value = le16_to_cpu(cr->wValue);
 	u8 entity_id = (w_index >> 8) & 0xff;
 	u8 control_selector = w_value >> 8;
 	int value = -EOPNOTSUPP;
+	int p_srate, c_srate;
+
+	opts = agdev_to_uac2_opts(agdev);
+	p_srate = opts->p_srate;
+	c_srate = opts->c_srate;
 
 	if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
 		struct cntrl_cur_lay3 c;
···
 	struct usb_request *req = fn->config->cdev->req;
 	struct audio_dev *agdev = func_to_agdev(fn);
 	struct snd_uac2_chip *uac2 = &agdev->uac2;
+	struct f_uac2_opts *opts;
 	u16 w_length = le16_to_cpu(cr->wLength);
 	u16 w_index = le16_to_cpu(cr->wIndex);
 	u16 w_value = le16_to_cpu(cr->wValue);
···
 	u8 control_selector = w_value >> 8;
 	struct cntrl_range_lay3 r;
 	int value = -EOPNOTSUPP;
+	int p_srate, c_srate;
+
+	opts = agdev_to_uac2_opts(agdev);
+	p_srate = opts->p_srate;
+	c_srate = opts->c_srate;
 
 	if (control_selector == UAC2_CS_CONTROL_SAM_FREQ) {
 		if (entity_id == USB_IN_CLK_ID)
···
 	return value;
 }
 
-static int audio_bind_config(struct usb_configuration *cfg)
+static inline struct f_uac2_opts *to_f_uac2_opts(struct config_item *item)
 {
-	int res;
-
-	agdev_g = kzalloc(sizeof *agdev_g, GFP_KERNEL);
-	if (agdev_g == NULL)
-		return -ENOMEM;
-
-	res = usb_string_ids_tab(cfg->cdev, strings_fn);
-	if (res)
-		return res;
-	iad_desc.iFunction = strings_fn[STR_ASSOC].id;
-	std_ac_if_desc.iInterface = strings_fn[STR_IF_CTRL].id;
-	in_clk_src_desc.iClockSource = strings_fn[STR_CLKSRC_IN].id;
-	out_clk_src_desc.iClockSource = strings_fn[STR_CLKSRC_OUT].id;
-	usb_out_it_desc.iTerminal = strings_fn[STR_USB_IT].id;
-	io_in_it_desc.iTerminal = strings_fn[STR_IO_IT].id;
-	usb_in_ot_desc.iTerminal = strings_fn[STR_USB_OT].id;
-	io_out_ot_desc.iTerminal = strings_fn[STR_IO_OT].id;
-	std_as_out_if0_desc.iInterface = strings_fn[STR_AS_OUT_ALT0].id;
-	std_as_out_if1_desc.iInterface = strings_fn[STR_AS_OUT_ALT1].id;
-	std_as_in_if0_desc.iInterface = strings_fn[STR_AS_IN_ALT0].id;
-	std_as_in_if1_desc.iInterface = strings_fn[STR_AS_IN_ALT1].id;
-
-	agdev_g->func.name = "uac2_func";
-	agdev_g->func.strings = fn_strings;
-	agdev_g->func.bind = afunc_bind;
-	agdev_g->func.unbind = afunc_unbind;
-	agdev_g->func.set_alt = afunc_set_alt;
-	agdev_g->func.get_alt = afunc_get_alt;
-	agdev_g->func.disable = afunc_disable;
-	agdev_g->func.setup = afunc_setup;
-
-	/* Initialize the configurable parameters */
-	usb_out_it_desc.bNrChannels = num_channels(c_chmask);
-	usb_out_it_desc.bmChannelConfig = cpu_to_le32(c_chmask);
-	io_in_it_desc.bNrChannels = num_channels(p_chmask);
-	io_in_it_desc.bmChannelConfig = cpu_to_le32(p_chmask);
-	as_out_hdr_desc.bNrChannels = num_channels(c_chmask);
-	as_out_hdr_desc.bmChannelConfig = cpu_to_le32(c_chmask);
-	as_in_hdr_desc.bNrChannels = num_channels(p_chmask);
-	as_in_hdr_desc.bmChannelConfig = cpu_to_le32(p_chmask);
-	as_out_fmt1_desc.bSubslotSize = c_ssize;
-	as_out_fmt1_desc.bBitResolution = c_ssize * 8;
-	as_in_fmt1_desc.bSubslotSize = p_ssize;
-	as_in_fmt1_desc.bBitResolution = p_ssize * 8;
-
-	snprintf(clksrc_in, sizeof(clksrc_in), "%uHz", p_srate);
-	snprintf(clksrc_out, sizeof(clksrc_out), "%uHz", c_srate);
-
-	res = usb_add_function(cfg, &agdev_g->func);
-	if (res < 0)
-		kfree(agdev_g);
-
-	return res;
+	return container_of(to_config_group(item), struct f_uac2_opts,
+			    func_inst.group);
 }
 
-static void
-uac2_unbind_config(struct usb_configuration *cfg)
+CONFIGFS_ATTR_STRUCT(f_uac2_opts);
+CONFIGFS_ATTR_OPS(f_uac2_opts);
+
+static void f_uac2_attr_release(struct config_item *item)
 {
-	kfree(agdev_g);
-	agdev_g = NULL;
+	struct f_uac2_opts *opts = to_f_uac2_opts(item);
+
+	usb_put_function_instance(&opts->func_inst);
 }
+
+static struct configfs_item_operations f_uac2_item_ops = {
+	.release	= f_uac2_attr_release,
+	.show_attribute	= f_uac2_opts_attr_show,
+	.store_attribute = f_uac2_opts_attr_store,
+};
+
+#define UAC2_ATTRIBUTE(name)						\
+static ssize_t f_uac2_opts_##name##_show(struct f_uac2_opts *opts,	\
+					 char *page)			\
+{									\
+	int result;							\
+									\
+	mutex_lock(&opts->lock);					\
+	result = sprintf(page, "%u\n", opts->name);			\
+	mutex_unlock(&opts->lock);					\
+									\
+	return result;							\
+}									\
+									\
+static ssize_t f_uac2_opts_##name##_store(struct f_uac2_opts *opts,	\
+					  const char *page, size_t len)	\
+{									\
+	int ret;							\
+	u32 num;							\
+									\
+	mutex_lock(&opts->lock);					\
+	if (opts->refcnt) {						\
+		ret = -EBUSY;						\
+		goto end;						\
+	}								\
+									\
+	ret = kstrtou32(page, 0, &num);					\
+	if (ret)							\
+		goto end;						\
+									\
+	opts->name = num;						\
+	ret = len;							\
+									\
+end:									\
+	mutex_unlock(&opts->lock);					\
+	return ret;							\
+}									\
+									\
+static struct f_uac2_opts_attribute f_uac2_opts_##name =		\
+	__CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR,			\
+			f_uac2_opts_##name##_show,			\
+			f_uac2_opts_##name##_store)
+
+UAC2_ATTRIBUTE(p_chmask);
+UAC2_ATTRIBUTE(p_srate);
+UAC2_ATTRIBUTE(p_ssize);
+UAC2_ATTRIBUTE(c_chmask);
+UAC2_ATTRIBUTE(c_srate);
+UAC2_ATTRIBUTE(c_ssize);
+
+static struct configfs_attribute *f_uac2_attrs[] = {
+	&f_uac2_opts_p_chmask.attr,
+	&f_uac2_opts_p_srate.attr,
+	&f_uac2_opts_p_ssize.attr,
+	&f_uac2_opts_c_chmask.attr,
+	&f_uac2_opts_c_srate.attr,
+	&f_uac2_opts_c_ssize.attr,
+	NULL,
+};
+
+static struct config_item_type f_uac2_func_type = {
+	.ct_item_ops	= &f_uac2_item_ops,
+	.ct_attrs	= f_uac2_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+static void afunc_free_inst(struct usb_function_instance *f)
+{
+	struct f_uac2_opts *opts;
+
+	opts = container_of(f, struct f_uac2_opts, func_inst);
+	kfree(opts);
+}
+
+static struct usb_function_instance *afunc_alloc_inst(void)
+{
+	struct f_uac2_opts *opts;
+
+	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+	if (!opts)
+		return ERR_PTR(-ENOMEM);
+
+	mutex_init(&opts->lock);
+	opts->func_inst.free_func_inst = afunc_free_inst;
+
+	config_group_init_type_name(&opts->func_inst.group, "",
+				    &f_uac2_func_type);
+
+	opts->p_chmask = UAC2_DEF_PCHMASK;
+	opts->p_srate = UAC2_DEF_PSRATE;
+	opts->p_ssize = UAC2_DEF_PSSIZE;
+	opts->c_chmask = UAC2_DEF_CCHMASK;
+	opts->c_srate = UAC2_DEF_CSRATE;
+	opts->c_ssize = UAC2_DEF_CSSIZE;
+	return &opts->func_inst;
+}
+
+static void afunc_free(struct usb_function *f)
+{
+	struct audio_dev *agdev;
+	struct f_uac2_opts *opts;
+
+	agdev = func_to_agdev(f);
+	opts = container_of(f->fi, struct f_uac2_opts, func_inst);
+	kfree(agdev);
+	mutex_lock(&opts->lock);
+	--opts->refcnt;
+	mutex_unlock(&opts->lock);
+}
+
+static void afunc_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct audio_dev *agdev = func_to_agdev(f);
+	struct uac2_rtd_params *prm;
+
+	alsa_uac2_exit(agdev);
+
+	prm = &agdev->uac2.p_prm;
+	kfree(prm->rbuf);
+
+	prm = &agdev->uac2.c_prm;
+	kfree(prm->rbuf);
+	usb_free_all_descriptors(f);
+
+	if (agdev->in_ep)
+		agdev->in_ep->driver_data = NULL;
+	if (agdev->out_ep)
+		agdev->out_ep->driver_data = NULL;
+}
+
+struct usb_function *afunc_alloc(struct usb_function_instance *fi)
+{
+	struct audio_dev *agdev;
+	struct f_uac2_opts *opts;
+
+	agdev = kzalloc(sizeof(*agdev), GFP_KERNEL);
+	if (agdev == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	opts = container_of(fi, struct f_uac2_opts, func_inst);
+	mutex_lock(&opts->lock);
+	++opts->refcnt;
+	mutex_unlock(&opts->lock);
+
+	agdev->func.name = "uac2_func";
+	agdev->func.bind = afunc_bind;
+	agdev->func.unbind = afunc_unbind;
+	agdev->func.set_alt = afunc_set_alt;
+	agdev->func.get_alt = afunc_get_alt;
+	agdev->func.disable = afunc_disable;
+	agdev->func.setup = afunc_setup;
+	agdev->func.free_func = afunc_free;
+
+	return &agdev->func;
+}
+
+DECLARE_USB_FUNCTION_INIT(uac2, afunc_alloc_inst, afunc_alloc);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yadwinder Singh");
+MODULE_AUTHOR("Jaswinder Singh");

drivers/usb/gadget/function/f_uvc.c

···
  */
 
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
···
 #include <media/v4l2-event.h>
 
 #include "uvc.h"
+#include "uvc_v4l2.h"
+#include "uvc_video.h"
+#include "u_uvc.h"
 
 unsigned int uvc_gadget_trace_param;
-
-/*-------------------------------------------------------------------------*/
-
-/* module parameters specific to the Video streaming endpoint */
-static unsigned int streaming_interval = 1;
-module_param(streaming_interval, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(streaming_interval, "1 - 16");
-
-static unsigned int streaming_maxpacket = 1024;
-module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)");
-
-static unsigned int streaming_maxburst;
-module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)");
 
 /* --------------------------------------------------------------------------
  * Function descriptors
···
 
 #define UVC_STATUS_MAX_PACKET_SIZE		16	/* 16 bytes status */
 
-static struct usb_interface_assoc_descriptor uvc_iad __initdata = {
+static struct usb_interface_assoc_descriptor uvc_iad = {
 	.bLength		= sizeof(uvc_iad),
 	.bDescriptorType	= USB_DT_INTERFACE_ASSOCIATION,
 	.bFirstInterface	= 0,
···
 	.iFunction		= 0,
 };
 
-static struct usb_interface_descriptor uvc_control_intf __initdata = {
+static struct usb_interface_descriptor uvc_control_intf = {
 	.bLength		= USB_DT_INTERFACE_SIZE,
 	.bDescriptorType	= USB_DT_INTERFACE,
 	.bInterfaceNumber	= UVC_INTF_VIDEO_CONTROL,
···
 	.iInterface		= 0,
 };
 
-static struct usb_endpoint_descriptor uvc_control_ep __initdata = {
+static struct usb_endpoint_descriptor uvc_control_ep = {
 	.bLength		= USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType	= USB_DT_ENDPOINT,
 	.bEndpointAddress	= USB_DIR_IN,
···
 	.bInterval		= 8,
 };
 
-static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp __initdata = {
+static struct usb_ss_ep_comp_descriptor uvc_ss_control_comp = {
 	.bLength		= sizeof(uvc_ss_control_comp),
 	.bDescriptorType	= USB_DT_SS_ENDPOINT_COMP,
 	/* The following 3 values can be tweaked if necessary. */
···
 	.wBytesPerInterval	= cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
 };
 
-static struct uvc_control_endpoint_descriptor uvc_control_cs_ep __initdata = {
+static struct uvc_control_endpoint_descriptor uvc_control_cs_ep = {
 	.bLength		= UVC_DT_CONTROL_ENDPOINT_SIZE,
 	.bDescriptorType	= USB_DT_CS_ENDPOINT,
 	.bDescriptorSubType	= UVC_EP_INTERRUPT,
 	.wMaxTransferSize	= cpu_to_le16(UVC_STATUS_MAX_PACKET_SIZE),
 };
 
-static struct usb_interface_descriptor uvc_streaming_intf_alt0 __initdata = {
+static struct usb_interface_descriptor uvc_streaming_intf_alt0 = {
 	.bLength		= USB_DT_INTERFACE_SIZE,
 	.bDescriptorType	= USB_DT_INTERFACE,
 	.bInterfaceNumber	= UVC_INTF_VIDEO_STREAMING,
···
 	.iInterface		= 0,
 };
 
-static struct usb_interface_descriptor uvc_streaming_intf_alt1 __initdata = {
+static struct usb_interface_descriptor uvc_streaming_intf_alt1 = {
 	.bLength		= USB_DT_INTERFACE_SIZE,
 	.bDescriptorType	= USB_DT_INTERFACE,
 	.bInterfaceNumber	= UVC_INTF_VIDEO_STREAMING,
···
 	.iInterface		= 0,
 };
 
-static struct usb_endpoint_descriptor uvc_fs_streaming_ep __initdata = {
+static struct usb_endpoint_descriptor uvc_fs_streaming_ep = {
 	.bLength		= USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType	= USB_DT_ENDPOINT,
 	.bEndpointAddress	= USB_DIR_IN,
···
 	 */
 };
 
-static struct usb_endpoint_descriptor uvc_hs_streaming_ep __initdata = {
+static struct usb_endpoint_descriptor uvc_hs_streaming_ep = {
 	.bLength		= USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType	= USB_DT_ENDPOINT,
 	.bEndpointAddress	= USB_DIR_IN,
···
 	 */
 };
 
-static struct usb_endpoint_descriptor uvc_ss_streaming_ep __initdata = {
+static struct usb_endpoint_descriptor uvc_ss_streaming_ep = {
 	.bLength		= USB_DT_ENDPOINT_SIZE,
 	.bDescriptorType	= USB_DT_ENDPOINT,
 
···
 	 */
 };
 
-static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp __initdata = {
+static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = {
 	.bLength		= sizeof(uvc_ss_streaming_comp),
 	.bDescriptorType	= USB_DT_SS_ENDPOINT_COMP,
 	/* The bMaxBurst, bmAttributes and wBytesPerInterval values will be
···
 	(struct usb_descriptor_header *) &uvc_ss_streaming_comp,
 	NULL,
 };
+
+void uvc_set_trace_param(unsigned int trace)
+{
+	uvc_gadget_trace_param = trace;
+}
+EXPORT_SYMBOL(uvc_set_trace_param);
 
 /* --------------------------------------------------------------------------
  * Control requests
···
 	/* Stall too big requests. */
 	if (le16_to_cpu(ctrl->wLength) > UVC_MAX_REQUEST_SIZE)
 		return -EINVAL;
+
+	/* Tell the complete callback to generate an event for the next request
+	 * that will be enqueued by UVCIOC_SEND_RESPONSE.
+	 */
+	uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN);
+	uvc->event_length = le16_to_cpu(ctrl->wLength);
 
 	memset(&v4l2_event, 0, sizeof(v4l2_event));
 	v4l2_event.type = UVC_EVENT_SETUP;
···
 
 	video->v4l2_dev = &uvc->v4l2_dev;
 	video->fops = &uvc_v4l2_fops;
+	video->ioctl_ops = &uvc_v4l2_ioctl_ops;
 	video->release = video_device_release;
+	video->vfl_dir = VFL_DIR_TX;
 	strlcpy(video->name, cdev->gadget->name, sizeof(video->name));
 
 	uvc->vdev = video;
···
 		} \
 	} while (0)
 
-static struct usb_descriptor_header ** __init
+static struct usb_descriptor_header **
 uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
 {
 	struct uvc_input_header_descriptor *uvc_streaming_header;
···
 	return hdr;
 }
 
-static void
-uvc_function_unbind(struct usb_configuration *c, struct usb_function *f)
-{
-	struct usb_composite_dev *cdev = c->cdev;
-	struct uvc_device *uvc = to_uvc(f);
-
-	INFO(cdev, "uvc_function_unbind\n");
-
-	video_unregister_device(uvc->vdev);
-	v4l2_device_unregister(&uvc->v4l2_dev);
-	uvc->control_ep->driver_data = NULL;
-	uvc->video.ep->driver_data = NULL;
-
-	uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id = 0;
-	usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
-	kfree(uvc->control_buf);
-
-	usb_free_all_descriptors(f);
-
-	kfree(uvc);
-}
-
-static int __init
+static int
 uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
 {
 	struct usb_composite_dev *cdev = c->cdev;
 	struct uvc_device *uvc = to_uvc(f);
+	struct usb_string *us;
 	unsigned int max_packet_mult;
 	unsigned int max_packet_size;
 	struct usb_ep *ep;
+	struct f_uvc_opts *opts;
 	int ret = -EINVAL;
 
 	INFO(cdev, "uvc_function_bind\n");
 
+	opts = to_f_uvc_opts(f->fi);
 	/* Sanity check the streaming endpoint module parameters.
 	 */
-	streaming_interval = clamp(streaming_interval, 1U, 16U);
-	streaming_maxpacket = clamp(streaming_maxpacket, 1U, 3072U);
-	streaming_maxburst = min(streaming_maxburst, 15U);
+	opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
+	opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
+	opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
 
 	/* Fill in the FS/HS/SS Video Streaming specific descriptors from the
 	 * module parameters.
···
 	 * NOTE: We assume that the user knows what they are doing and won't
 	 * give parameters that their UDC doesn't support.
 	 */
-	if (streaming_maxpacket <= 1024) {
+	if (opts->streaming_maxpacket <= 1024) {
 		max_packet_mult = 1;
-		max_packet_size = streaming_maxpacket;
-	} else if (streaming_maxpacket <= 2048) {
+		max_packet_size = opts->streaming_maxpacket;
+	} else if (opts->streaming_maxpacket <= 2048) {
 		max_packet_mult = 2;
-		max_packet_size = streaming_maxpacket / 2;
+		max_packet_size = opts->streaming_maxpacket / 2;
 	} else {
 		max_packet_mult = 3;
-		max_packet_size = streaming_maxpacket / 3;
+		max_packet_size = opts->streaming_maxpacket / 3;
 	}
 
-	uvc_fs_streaming_ep.wMaxPacketSize = min(streaming_maxpacket, 1023U);
-	uvc_fs_streaming_ep.bInterval = streaming_interval;
+	uvc_fs_streaming_ep.wMaxPacketSize =
+		cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
+	uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
 
-	uvc_hs_streaming_ep.wMaxPacketSize = max_packet_size;
-	uvc_hs_streaming_ep.wMaxPacketSize |= ((max_packet_mult - 1) << 11);
-	uvc_hs_streaming_ep.bInterval = streaming_interval;
+	uvc_hs_streaming_ep.wMaxPacketSize =
+		cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11));
+	uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
 
-	uvc_ss_streaming_ep.wMaxPacketSize = max_packet_size;
-	uvc_ss_streaming_ep.bInterval = streaming_interval;
+	uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
+	uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
 	uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
-	uvc_ss_streaming_comp.bMaxBurst = streaming_maxburst;
+	uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
 	uvc_ss_streaming_comp.wBytesPerInterval =
-		max_packet_size * max_packet_mult * streaming_maxburst;
+		cpu_to_le16(max_packet_size * max_packet_mult *
+			    opts->streaming_maxburst);
 
 	/* Allocate endpoints. */
 	ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
···
 	uvc_fs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
 	uvc_hs_streaming_ep.bEndpointAddress = uvc->video.ep->address;
 	uvc_ss_streaming_ep.bEndpointAddress = uvc->video.ep->address;
+
+	us = usb_gstrings_attach(cdev, uvc_function_strings,
+				 ARRAY_SIZE(uvc_en_us_strings));
+	if (IS_ERR(us)) {
+		ret = PTR_ERR(us);
+		goto error;
+	}
+	uvc_iad.iFunction = us[UVC_STRING_CONTROL_IDX].id;
+	uvc_control_intf.iInterface = us[UVC_STRING_CONTROL_IDX].id;
+	ret = us[UVC_STRING_STREAMING_IDX].id;
+	uvc_streaming_intf_alt0.iInterface = ret;
+	uvc_streaming_intf_alt1.iInterface = ret;
 
 	/* Allocate interface IDs. */
 	if ((ret = usb_interface_id(c, f)) < 0)
···
 	}
 
 	/* Initialise video. */
-	ret = uvc_video_init(&uvc->video);
+	ret = uvcg_video_init(&uvc->video);
 	if (ret < 0)
 		goto error;
 
···
 	if (uvc->video.ep)
 		uvc->video.ep->driver_data = NULL;
 
-	if (uvc->control_req) {
+	if (uvc->control_req)
 		usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
-		kfree(uvc->control_buf);
-	}
+	kfree(uvc->control_buf);
 
 	usb_free_all_descriptors(f);
 	return ret;
···
  * USB gadget function
  */
 
-/**
- * uvc_bind_config - add a UVC function to a configuration
- * @c: the configuration to support the UVC instance
- * Context: single threaded during gadget setup
- *
- * Returns zero on success, else negative errno.
- *
- * Caller must have called @uvc_setup(). Caller is also responsible for
- * calling @uvc_cleanup() before module unload.
- */
-int __init
-uvc_bind_config(struct usb_configuration *c,
-		const struct uvc_descriptor_header * const *fs_control,
-		const struct uvc_descriptor_header * const *ss_control,
-		const struct uvc_descriptor_header * const *fs_streaming,
-		const struct uvc_descriptor_header * const *hs_streaming,
-		const struct uvc_descriptor_header * const *ss_streaming)
+static void uvc_free_inst(struct usb_function_instance *f)
+{
+	struct f_uvc_opts *opts = to_f_uvc_opts(f);
+
+	kfree(opts);
+}
+
+static struct usb_function_instance *uvc_alloc_inst(void)
+{
+	struct f_uvc_opts *opts;
+
+	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
+	if (!opts)
+		return ERR_PTR(-ENOMEM);
+	opts->func_inst.free_func_inst = uvc_free_inst;
+
+	return &opts->func_inst;
+}
+
+static void uvc_free(struct usb_function *f)
+{
+	struct uvc_device *uvc = to_uvc(f);
+
+	kfree(uvc);
+}
+
+static void uvc_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	struct usb_composite_dev *cdev = c->cdev;
+	struct uvc_device *uvc = to_uvc(f);
+
+	INFO(cdev, "%s\n", __func__);
+
+	video_unregister_device(uvc->vdev);
+	v4l2_device_unregister(&uvc->v4l2_dev);
+	uvc->control_ep->driver_data = NULL;
+	uvc->video.ep->driver_data = NULL;
+
+	usb_ep_free_request(cdev->gadget->ep0, uvc->control_req);
+	kfree(uvc->control_buf);
+
+	usb_free_all_descriptors(f);
+}
+
+static struct usb_function *uvc_alloc(struct usb_function_instance *fi)
 {
 	struct uvc_device *uvc;
-	int ret = 0;
-
-	/* TODO Check if the USB device controller supports the required
-	 * features.
-	 */
-	if (!gadget_is_dualspeed(c->cdev->gadget))
-		return -EINVAL;
+	struct f_uvc_opts *opts;
 
 	uvc = kzalloc(sizeof(*uvc), GFP_KERNEL);
 	if (uvc == NULL)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	uvc->state = UVC_STATE_DISCONNECTED;
+	opts = to_f_uvc_opts(fi);
 
-	/* Validate the descriptors. */
-	if (fs_control == NULL || fs_control[0] == NULL ||
-	    fs_control[0]->bDescriptorSubType != UVC_VC_HEADER)
-		goto error;
-
-	if (ss_control == NULL || ss_control[0] == NULL ||
-	    ss_control[0]->bDescriptorSubType != UVC_VC_HEADER)
-		goto error;
-
-	if (fs_streaming == NULL || fs_streaming[0] == NULL ||
-	    fs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
-		goto error;
-
-	if (hs_streaming == NULL || hs_streaming[0] == NULL ||
-	    hs_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
-		goto error;
-
-	if (ss_streaming == NULL || ss_streaming[0] == NULL ||
-	    ss_streaming[0]->bDescriptorSubType != UVC_VS_INPUT_HEADER)
-		goto error;
-
-	uvc->desc.fs_control = fs_control;
-	uvc->desc.ss_control = ss_control;
-	uvc->desc.fs_streaming = fs_streaming;
-	uvc->desc.hs_streaming = hs_streaming;
-	uvc->desc.ss_streaming = ss_streaming;
-
-	/* String descriptors are global, we only need to allocate string IDs
-	 * for the first UVC function. UVC functions beyond the first (if any)
-	 * will reuse the same IDs.
-	 */
-	if (uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id == 0) {
-		ret = usb_string_ids_tab(c->cdev, uvc_en_us_strings);
-		if (ret)
-			goto error;
-		uvc_iad.iFunction =
-			uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id;
-		uvc_control_intf.iInterface =
-			uvc_en_us_strings[UVC_STRING_CONTROL_IDX].id;
-		ret = uvc_en_us_strings[UVC_STRING_STREAMING_IDX].id;
-		uvc_streaming_intf_alt0.iInterface = ret;
-		uvc_streaming_intf_alt1.iInterface = ret;
-	}
+	uvc->desc.fs_control = opts->fs_control;
+	uvc->desc.ss_control = opts->ss_control;
+	uvc->desc.fs_streaming = opts->fs_streaming;
+	uvc->desc.hs_streaming = opts->hs_streaming;
+	uvc->desc.ss_streaming = opts->ss_streaming;
 
 	/* Register the function. */
 	uvc->func.name = "uvc";
-	uvc->func.strings = uvc_function_strings;
 	uvc->func.bind = uvc_function_bind;
-	uvc->func.unbind = uvc_function_unbind;
+	uvc->func.unbind = uvc_unbind;
 	uvc->func.get_alt = uvc_function_get_alt;
 	uvc->func.set_alt = uvc_function_set_alt;
 	uvc->func.disable = uvc_function_disable;
 	uvc->func.setup = uvc_function_setup;
+	uvc->func.free_func = uvc_free;
 
-	ret = usb_add_function(c, &uvc->func);
-	if (ret)
-		kfree(uvc);
-
-	return ret;
-
-error:
-	kfree(uvc);
-	return ret;
+	return &uvc->func;
 }
 
-module_param_named(trace, uvc_gadget_trace_param, uint, S_IRUGO|S_IWUSR);
-MODULE_PARM_DESC(trace, "Trace level bitmask");
-
+DECLARE_USB_FUNCTION_INIT(uvc, uvc_alloc_inst, uvc_alloc);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Laurent Pinchart");

drivers/usb/gadget/function/f_uvc.h

···
 #include <linux/usb/composite.h>
 #include <linux/usb/video.h>
 
-int uvc_bind_config(struct usb_configuration *c,
-		    const struct uvc_descriptor_header * const *fs_control,
-		    const struct uvc_descriptor_header * const *hs_control,
-		    const struct uvc_descriptor_header * const *fs_streaming,
-		    const struct uvc_descriptor_header * const *hs_streaming,
-		    const struct uvc_descriptor_header * const *ss_streaming);
+#include "uvc.h"
+
+void uvc_function_setup_continue(struct uvc_device *uvc);
+
+void uvc_function_connect(struct uvc_device *uvc);
+
+void uvc_function_disconnect(struct uvc_device *uvc);
 
 #endif /* _F_UVC_H_ */
 

drivers/usb/gadget/function/g_zero.h

···
 #define GZERO_QLEN		32
 #define GZERO_ISOC_INTERVAL	4
 #define GZERO_ISOC_MAXPACKET	1024
+#define GZERO_INT_INTERVAL	1 /* Default interrupt interval = 1 ms */
+#define GZERO_INT_MAXPACKET	1024
 
 struct usb_zero_options {
 	unsigned pattern;
···
 	unsigned isoc_maxpacket;
 	unsigned isoc_mult;
 	unsigned isoc_maxburst;
+	unsigned int_interval; /* In ms */
+	unsigned int_maxpacket;
+	unsigned int_mult;
+	unsigned int_maxburst;
 	unsigned bulk_buflen;
 	unsigned qlen;
 };
···
 	unsigned isoc_maxpacket;
 	unsigned isoc_mult;
 	unsigned isoc_maxburst;
+	unsigned int_interval; /* In ms */
+	unsigned int_maxpacket;
+	unsigned int_mult;
+	unsigned int_maxburst;
 	unsigned bulk_buflen;
 
 	/*
···
 void free_ep_req(struct usb_ep *ep, struct usb_request *req);
 void disable_endpoints(struct usb_composite_dev *cdev,
 		struct usb_ep *in, struct usb_ep *out,
-		struct usb_ep *iso_in, struct usb_ep *iso_out);
+		struct usb_ep *iso_in, struct usb_ep *iso_out,
+		struct usb_ep *int_in, struct usb_ep *int_out);
 
 #endif /* __G_ZERO_H */

drivers/usb/gadget/function/u_fs.h

···
 	void				*ms_os_descs_ext_prop_name_avail;
 	void				*ms_os_descs_ext_prop_data_avail;
 
+	unsigned			user_flags;
+
 	u8				eps_addrmap[15];
 
 	unsigned short			strings_count;

drivers/usb/gadget/function/u_serial.c

···
  * for a telephone or fax link.  And ttyGS2 might be something that just
  * needs a simple byte stream interface for some messaging protocol that
  * is managed in userspace ... OBEX, PTP, and MTP have been mentioned.
- */
-
-#define PREFIX	"ttyGS"
-
-/*
+ *
+ *
  * gserial is the lifecycle interface, used by USB functions
  * gs_port is the I/O nexus, used by the tty driver
  * tty_struct links to the tty/filesystem framework
···
 		list_del(&req->list);
 		req->zero = (gs_buf_data_avail(&port->port_write_buf) == 0);
 
-		pr_vdebug(PREFIX "%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",
-				port->port_num, len, *((u8 *)req->buf),
-				*((u8 *)req->buf+1), *((u8 *)req->buf+2));
+		pr_vdebug("ttyGS%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n",
+			  port->port_num, len, *((u8 *)req->buf),
+			  *((u8 *)req->buf+1), *((u8 *)req->buf+2));
 
 		/* Drop lock while we call out of driver; completions
 		 * could be issued while we do so.  Disconnection may
···
 		switch (req->status) {
 		case -ESHUTDOWN:
 			disconnect = true;
-			pr_vdebug(PREFIX "%d: shutdown\n", port->port_num);
+			pr_vdebug("ttyGS%d: shutdown\n", port->port_num);
 			break;
 
 		default:
 			/* presumably a transient fault */
-			pr_warning(PREFIX "%d: unexpected RX status %d\n",
-					port->port_num, req->status);
+			pr_warn("ttyGS%d: unexpected RX status %d\n",
+				port->port_num, req->status);
 			/* FALLTHROUGH */
 		case 0:
 			/* normal completion */
···
 			if (count != size) {
 				/* stop pushing; TTY layer can't handle more */
 				port->n_read += count;
-				pr_vdebug(PREFIX "%d: rx block %d/%d\n",
-						port->port_num,
-						count, req->actual);
+				pr_vdebug("ttyGS%d: rx block %d/%d\n",
+					  port->port_num, count, req->actual);
 				break;
 			}
 			port->n_read = 0;
···
 			if (do_push)
 				tasklet_schedule(&port->push);
 			else
-				pr_warning(PREFIX "%d: RX not scheduled?\n",
+				pr_warn("ttyGS%d: RX not scheduled?\n",
 					port->port_num);
 		}
 	}
···
 		 * read queue backs up enough we'll be NAKing OUT packets.
 		 */
 		tasklet_schedule(&port->push);
-		pr_vdebug(PREFIX "%d: unthrottle\n", port->port_num);
+		pr_vdebug("ttyGS%d: unthrottle\n", port->port_num);
 	}
 	spin_unlock_irqrestore(&port->port_lock, flags);
 }
···
 		return -ENOMEM;
 
 	gs_tty_driver->driver_name = "g_serial";
-	gs_tty_driver->name = PREFIX;
+	gs_tty_driver->name = "ttyGS";
 	/* uses dynamically assigned dev_t values */
 
 	gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;

drivers/usb/gadget/function/u_uac1.c

···
  */
 
 #include <linux/kernel.h>
+#include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/delay.h>
···
 /*
  * This component encapsulates the ALSA devices for USB audio gadget
  */
-
-#define FILE_PCM_PLAYBACK	"/dev/snd/pcmC0D0p"
-#define FILE_PCM_CAPTURE	"/dev/snd/pcmC0D0c"
-#define FILE_CONTROL		"/dev/snd/controlC0"
-
-static char *fn_play = FILE_PCM_PLAYBACK;
-module_param(fn_play, charp, S_IRUGO);
-MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
-
-static char *fn_cap = FILE_PCM_CAPTURE;
-module_param(fn_cap, charp, S_IRUGO);
-MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
-
-static char *fn_cntl = FILE_CONTROL;
-module_param(fn_cntl, charp, S_IRUGO);
-MODULE_PARM_DESC(fn_cntl, "Control device file name");
 
 /*-------------------------------------------------------------------------*/
 
···
 /**
  * Playback audio buffer data by ALSA PCM device
  */
-static size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
+size_t u_audio_playback(struct gaudio *card, void *buf, size_t count)
 {
 	struct gaudio_snd_dev	*snd = &card->playback;
 	struct snd_pcm_substream *substream = snd->substream;
···
 	return 0;
 }
 
-static int u_audio_get_playback_channels(struct gaudio *card)
+int u_audio_get_playback_channels(struct gaudio *card)
 {
 	return card->playback.channels;
 }
 
-static int u_audio_get_playback_rate(struct gaudio *card)
+int u_audio_get_playback_rate(struct gaudio *card)
 {
 	return card->playback.rate;
 }
···
 {
 	struct snd_pcm_file *pcm_file;
 	struct gaudio_snd_dev *snd;
+	struct f_uac1_opts *opts;
+	char *fn_play, *fn_cap, *fn_cntl;
+
+	opts = container_of(card->func.fi, struct f_uac1_opts, func_inst);
+	fn_play = opts->fn_play;
+	fn_cap = opts->fn_cap;
+	fn_cntl = opts->fn_cntl;
 
 	if (!card)
 		return -ENODEV;
···
 	return 0;
 }
 
-static struct gaudio *the_card;
 /**
  * gaudio_setup - setup ALSA interface and preparing for USB transfer
  *
···
  *
  * Returns negative errno, or zero on success
  */
-int __init gaudio_setup(struct gaudio *card)
+int gaudio_setup(struct gaudio *card)
 {
 	int	ret;
 
 	ret = gaudio_open_snd_dev(card);
 	if (ret)
 		ERROR(card, "we need at least one control device\n");
-	else if (!the_card)
-		the_card = card;
 
 	return ret;
 
···
  *
  * This is called to free all resources allocated by @gaudio_setup().
  */
-void gaudio_cleanup(void)
+void gaudio_cleanup(struct gaudio *the_card)
 {
 	if (the_card) {
 		gaudio_close_snd_dev(the_card);
-		the_card = NULL;
 	}
 }
 

drivers/usb/gadget/function/u_uac1.h

···
 
 #include "gadget_chips.h"
 
+#define FILE_PCM_PLAYBACK	"/dev/snd/pcmC0D0p"
+#define FILE_PCM_CAPTURE	"/dev/snd/pcmC0D0c"
+#define FILE_CONTROL		"/dev/snd/controlC0"
+
+#define UAC1_OUT_EP_MAX_PACKET_SIZE	200
+#define UAC1_REQ_COUNT			256
+#define UAC1_AUDIO_BUF_SIZE		48000
+
 /*
  * This represents the USB side of an audio card device, managed by a USB
  * function which provides control and stream interfaces.
···
 	/* TODO */
 };
 
+struct f_uac1_opts {
+	struct usb_function_instance	func_inst;
+	int				req_buf_size;
+	int				req_count;
+	int				audio_buf_size;
+	char				*fn_play;
+	char				*fn_cap;
+	char				*fn_cntl;
+	unsigned			bound:1;
+	unsigned			fn_play_alloc:1;
+	unsigned			fn_cap_alloc:1;
+	unsigned			fn_cntl_alloc:1;
+	struct gaudio			*card;
+	struct mutex			lock;
+	int				refcnt;
+};
+
 int gaudio_setup(struct gaudio *card);
-void gaudio_cleanup(void);
+void gaudio_cleanup(struct gaudio *the_card);
+
+size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
+int u_audio_get_playback_channels(struct gaudio *card);
+int u_audio_get_playback_rate(struct gaudio *card);
 
 #endif /* __U_AUDIO_H */

drivers/usb/gadget/function/u_uac2.h

···
+/*
+ * u_uac2.h
+ *
+ * Utility definitions for UAC2 function
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Author: Andrzej Pietrasiewicz <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef U_UAC2_H
+#define U_UAC2_H
+
+#include <linux/usb/composite.h>
+
+#define UAC2_DEF_PCHMASK 0x3
+#define UAC2_DEF_PSRATE 48000
+#define UAC2_DEF_PSSIZE 2
+#define UAC2_DEF_CCHMASK 0x3
+#define UAC2_DEF_CSRATE 64000
+#define UAC2_DEF_CSSIZE 2
+
+struct f_uac2_opts {
+	struct usb_function_instance	func_inst;
+	int				p_chmask;
+	int				p_srate;
+	int				p_ssize;
+	int				c_chmask;
+	int				c_srate;
+	int				c_ssize;
+	bool				bound;
+
+	struct mutex			lock;
+	int				refcnt;
+};
+
+#endif

drivers/usb/gadget/function/u_uvc.h

···
+/*
+ * u_uvc.h
+ *
+ * Utility definitions for the uvc function
+ *
+ * Copyright (c) 2013-2014 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * Author: Andrzej Pietrasiewicz <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef U_UVC_H
+#define U_UVC_H
+
+#include <linux/usb/composite.h>
+
+#define to_f_uvc_opts(f)	container_of(f, struct f_uvc_opts, func_inst)
+
+struct f_uvc_opts {
+	struct usb_function_instance			func_inst;
+	unsigned int					uvc_gadget_trace_param;
+	unsigned int					streaming_interval;
+	unsigned int					streaming_maxpacket;
+	unsigned int					streaming_maxburst;
+	const struct uvc_descriptor_header * const	*fs_control;
+	const struct uvc_descriptor_header * const	*ss_control;
+	const struct uvc_descriptor_header * const	*fs_streaming;
+	const struct uvc_descriptor_header * const	*hs_streaming;
+	const struct uvc_descriptor_header * const	*ss_streaming;
+};
+
+void uvc_set_trace_param(unsigned int trace);
+
+#endif /* U_UVC_H */
+

drivers/usb/gadget/function/uvc.h

···
 #ifdef __KERNEL__
 
 #include <linux/usb.h>	/* For usb_endpoint_* */
+#include <linux/usb/composite.h>
 #include <linux/usb/gadget.h>
 #include <linux/videodev2.h>
 #include <linux/version.h>
···
 /* ------------------------------------------------------------------------
  * Driver specific constants
  */
-
-#define DRIVER_VERSION				"0.1.0"
-#define DRIVER_VERSION_NUMBER			KERNEL_VERSION(0, 1, 0)
 
 #define UVC_NUM_REQUESTS			4
 #define UVC_MAX_REQUEST_SIZE			64

drivers/usb/gadget/function/uvc_queue.c

···
 /* ------------------------------------------------------------------------
  * Video buffers queue management.
  *
- * Video queues is initialized by uvc_queue_init(). The function performs
+ * Video queues is initialized by uvcg_queue_init(). The function performs
  * basic initialization of the uvc_video_queue struct and never fails.
  *
  * Video buffers are managed by videobuf2. The driver uses a mutex to protect
···
 	.wait_finish = uvc_wait_finish,
 };
 
-static int uvc_queue_init(struct uvc_video_queue *queue,
-			  enum v4l2_buf_type type)
+int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type)
 {
 	int ret;
 
 	queue->queue.type = type;
-	queue->queue.io_modes = VB2_MMAP | VB2_USERPTR;
+	queue->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 	queue->queue.drv_priv = queue;
 	queue->queue.buf_struct_size = sizeof(struct uvc_buffer);
 	queue->queue.ops = &uvc_queue_qops;
···
 /*
  * Free the video buffers.
  */
-static void uvc_free_buffers(struct uvc_video_queue *queue)
+void uvcg_free_buffers(struct uvc_video_queue *queue)
 {
 	mutex_lock(&queue->mutex);
 	vb2_queue_release(&queue->queue);
···
 /*
  * Allocate the video buffers.
  */
-static int uvc_alloc_buffers(struct uvc_video_queue *queue,
-			     struct v4l2_requestbuffers *rb)
+int uvcg_alloc_buffers(struct uvc_video_queue *queue,
+			      struct v4l2_requestbuffers *rb)
 {
 	int ret;
 
···
 	return ret ? ret : rb->count;
 }
 
-static int uvc_query_buffer(struct uvc_video_queue *queue,
-			    struct v4l2_buffer *buf)
+int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
 {
 	int ret;
 
···
 	return ret;
 }
 
-static int uvc_queue_buffer(struct uvc_video_queue *queue,
-			    struct v4l2_buffer *buf)
+int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf)
 {
 	unsigned long flags;
 	int ret;
···
  * Dequeue a video buffer. If nonblocking is false, block until a buffer is
  * available.
  */
-static int uvc_dequeue_buffer(struct uvc_video_queue *queue,
-			      struct v4l2_buffer *buf, int nonblocking)
+int uvcg_dequeue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf,
+			int nonblocking)
 {
 	int ret;
 
···
  * This function implements video queue polling and is intended to be used by
  * the device poll handler.
  */
-static unsigned int uvc_queue_poll(struct uvc_video_queue *queue,
-				   struct file *file, poll_table *wait)
+unsigned int uvcg_queue_poll(struct uvc_video_queue *queue, struct file *file,
+			     poll_table *wait)
 {
 	unsigned int ret;
 
···
 	return ret;
 }
 
-static int uvc_queue_mmap(struct uvc_video_queue *queue,
-			  struct vm_area_struct *vma)
+int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma)
 {
 	int ret;
 
···
  *
  * NO-MMU arch need this function to make mmap() work correctly.
  */
-static unsigned long uvc_queue_get_unmapped_area(struct uvc_video_queue *queue,
-		unsigned long pgoff)
+unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
+					   unsigned long pgoff)
 {
 	unsigned long ret;
 
···
  * This function acquires the irq spinlock and can be called from interrupt
  * context.
  */
-static void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect)
+void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect)
 {
 	struct uvc_buffer *buf;
 	unsigned long flags;
···
  * the main queue.
  *
  * This function can't be called from interrupt context. Use
- * uvc_queue_cancel() instead.
+ * uvcg_queue_cancel() instead.
  */
-static int uvc_queue_enable(struct uvc_video_queue *queue, int enable)
+int uvcg_queue_enable(struct uvc_video_queue *queue, int enable)
 {
 	unsigned long flags;
 	int ret = 0;
···
 }
 
 /* called with &queue_irqlock held.. */
-static struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue,
-						struct uvc_buffer *buf)
+struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
+					  struct uvc_buffer *buf)
 {
 	struct uvc_buffer *nextbuf;
 
···
 	return nextbuf;
 }
 
-static struct uvc_buffer *uvc_queue_head(struct uvc_video_queue *queue)
+struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue)
 {
 	struct uvc_buffer *buf = NULL;
 

drivers/usb/gadget/function/uvc_queue.h

···
 	return vb2_is_streaming(&queue->queue);
 }
 
+int uvcg_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type);
+
+void uvcg_free_buffers(struct uvc_video_queue *queue);
+
+int uvcg_alloc_buffers(struct uvc_video_queue *queue,
+		       struct v4l2_requestbuffers *rb);
+
+int uvcg_query_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
+
+int uvcg_queue_buffer(struct uvc_video_queue *queue, struct v4l2_buffer *buf);
+
+int uvcg_dequeue_buffer(struct uvc_video_queue *queue,
+			struct v4l2_buffer *buf, int nonblocking);
+
+unsigned int uvcg_queue_poll(struct uvc_video_queue *queue,
+			     struct file *file, poll_table *wait);
+
+int uvcg_queue_mmap(struct uvc_video_queue *queue, struct vm_area_struct *vma);
+
+#ifndef CONFIG_MMU
+unsigned long uvcg_queue_get_unmapped_area(struct uvc_video_queue *queue,
+					   unsigned long pgoff);
+#endif /* CONFIG_MMU */
+
+void uvcg_queue_cancel(struct uvc_video_queue *queue, int disconnect);
+
+int uvcg_queue_enable(struct uvc_video_queue *queue, int enable);
+
+struct uvc_buffer *uvcg_queue_next_buffer(struct uvc_video_queue *queue,
+					  struct uvc_buffer *buf);
+
+struct uvc_buffer *uvcg_queue_head(struct uvc_video_queue *queue);
+
 #endif /* __KERNEL__ */
 
 #endif /* _UVC_QUEUE_H_ */

drivers/usb/gadget/function/uvc_v4l2.c

···
 #include <media/v4l2-event.h>
 #include <media/v4l2-ioctl.h>
 
+#include "f_uvc.h"
 #include "uvc.h"
 #include "uvc_queue.h"
+#include "uvc_video.h"
 
 /* --------------------------------------------------------------------------
  * Requests handling
···
 }
 
 /* --------------------------------------------------------------------------
- * V4L2
+ * V4L2 ioctls
  */
 
 struct uvc_format
···
 };
 
 static int
-uvc_v4l2_get_format(struct uvc_video *video, struct v4l2_format *fmt)
+uvc_v4l2_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 {
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct usb_composite_dev *cdev = uvc->func.config->cdev;
+
+	strlcpy(cap->driver, "g_uvc", sizeof(cap->driver));
+	strlcpy(cap->card, cdev->gadget->name, sizeof(cap->card));
+	strlcpy(cap->bus_info, dev_name(&cdev->gadget->dev),
+		sizeof(cap->bus_info));
+
+	cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+
+	return 0;
+}
+
+static int
+uvc_v4l2_get_format(struct file *file, void *fh, struct v4l2_format *fmt)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct uvc_video *video = &uvc->video;
+
 	fmt->fmt.pix.pixelformat = video->fcc;
 	fmt->fmt.pix.width = video->width;
 	fmt->fmt.pix.height = video->height;
···
 }
 
 static int
-uvc_v4l2_set_format(struct uvc_video *video, struct v4l2_format *fmt)
+uvc_v4l2_set_format(struct file *file, void *fh, struct v4l2_format *fmt)
 {
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct uvc_video *video = &uvc->video;
 	struct uvc_format *format;
 	unsigned int imagesize;
 	unsigned int bpl;
···
 }
 
 static int
+uvc_v4l2_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *b)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct uvc_video *video = &uvc->video;
+
+	if (b->type != video->queue.queue.type)
+		return -EINVAL;
+
+	return uvcg_alloc_buffers(&video->queue, b);
+}
+
+static int
+uvc_v4l2_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct uvc_video *video = &uvc->video;
+
+	return uvcg_query_buffer(&video->queue, b);
+}
+
+static int
+uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct uvc_video *video = &uvc->video;
+	int ret;
+
+	ret = uvcg_queue_buffer(&video->queue, b);
+	if (ret < 0)
+		return ret;
+
+	return uvcg_video_pump(video);
+}
+
+static int
+uvc_v4l2_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct uvc_video *video = &uvc->video;
+
+	return uvcg_dequeue_buffer(&video->queue, b, file->f_flags & O_NONBLOCK);
+}
+
+static int
+uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct uvc_video *video = &uvc->video;
+	int ret;
+
+	if (type != video->queue.queue.type)
+		return -EINVAL;
+
+	/* Enable UVC video. */
+	ret = uvcg_video_enable(video, 1);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Complete the alternate setting selection setup phase now that
+	 * userspace is ready to provide video frames.
+	 */
+	uvc_function_setup_continue(uvc);
+	uvc->state = UVC_STATE_STREAMING;
+
+	return 0;
+}
+
+static int
+uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+	struct uvc_video *video = &uvc->video;
+
+	if (type != video->queue.queue.type)
+		return -EINVAL;
+
+	return uvcg_video_enable(video, 0);
+}
+
+static int
+uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
+			 const struct v4l2_event_subscription *sub)
+{
+	if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
+		return -EINVAL;
+
+	return v4l2_event_subscribe(fh, sub, 2, NULL);
+}
+
+static int
+uvc_v4l2_unsubscribe_event(struct v4l2_fh *fh,
+			   const struct v4l2_event_subscription *sub)
+{
+	return v4l2_event_unsubscribe(fh, sub);
+}
+
+static long
+uvc_v4l2_ioctl_default(struct file *file, void *fh, bool valid_prio,
+		       unsigned int cmd, void *arg)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct uvc_device *uvc = video_get_drvdata(vdev);
+
+	switch (cmd) {
+	case UVCIOC_SEND_RESPONSE:
+		return uvc_send_response(uvc, arg);
+
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops = {
+	.vidioc_querycap = uvc_v4l2_querycap,
+	.vidioc_g_fmt_vid_out = uvc_v4l2_get_format,
+	.vidioc_s_fmt_vid_out = uvc_v4l2_set_format,
+	.vidioc_reqbufs = uvc_v4l2_reqbufs,
+	.vidioc_querybuf = uvc_v4l2_querybuf,
+	.vidioc_qbuf = uvc_v4l2_qbuf,
+	.vidioc_dqbuf = uvc_v4l2_dqbuf,
+	.vidioc_streamon = uvc_v4l2_streamon,
+	.vidioc_streamoff = uvc_v4l2_streamoff,
+	.vidioc_subscribe_event = uvc_v4l2_subscribe_event,
+	.vidioc_unsubscribe_event = uvc_v4l2_unsubscribe_event,
+	.vidioc_default = uvc_v4l2_ioctl_default,
+};
+
+/* --------------------------------------------------------------------------
+ * V4L2
+ */
+
+static int
 uvc_v4l2_open(struct file *file)
 {
 	struct video_device *vdev = video_devdata(file);
···
 
 	uvc_function_disconnect(uvc);
 
-	uvc_video_enable(video, 0);
-	uvc_free_buffers(&video->queue);
+	uvcg_video_enable(video, 0);
+	uvcg_free_buffers(&video->queue);
 
 	file->private_data = NULL;
 	v4l2_fh_del(&handle->vfh);
···
 	return 0;
 }
 
-static long
-uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
-{
-	struct video_device *vdev = video_devdata(file);
-	struct uvc_device *uvc = video_get_drvdata(vdev);
-	struct uvc_file_handle *handle = to_uvc_file_handle(file->private_data);
-	struct usb_composite_dev *cdev = uvc->func.config->cdev;
-	struct uvc_video *video = &uvc->video;
-	int ret = 0;
-
-	switch (cmd) {
-	/* Query capabilities */
-	case VIDIOC_QUERYCAP:
-	{
-		struct v4l2_capability *cap = arg;
-
-		memset(cap, 0, sizeof *cap);
-		strlcpy(cap->driver, "g_uvc", sizeof(cap->driver));
-		strlcpy(cap->card, cdev->gadget->name, sizeof(cap->card));
-		strlcpy(cap->bus_info, dev_name(&cdev->gadget->dev),
-			sizeof cap->bus_info);
-		cap->version = DRIVER_VERSION_NUMBER;
-		cap->capabilities = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
-		break;
-	}
-
-	/* Get & Set format */
-	case VIDIOC_G_FMT:
-	{
-		struct v4l2_format *fmt = arg;
-
-		if (fmt->type != video->queue.queue.type)
-			return -EINVAL;
-
-		return uvc_v4l2_get_format(video, fmt);
-	}
-
-	case VIDIOC_S_FMT:
-	{
-		struct v4l2_format *fmt = arg;
-
-		if (fmt->type != video->queue.queue.type)
-			return -EINVAL;
-
-		return uvc_v4l2_set_format(video, fmt);
-	}
-
-	/* Buffers & streaming */
-	case VIDIOC_REQBUFS:
-	{
-		struct v4l2_requestbuffers *rb = arg;
-
-		if (rb->type != video->queue.queue.type)
-			return -EINVAL;
-
-		ret = uvc_alloc_buffers(&video->queue, rb);
-		if (ret < 0)
-			return ret;
-
-		ret = 0;
-		break;
-	}
-
-	case VIDIOC_QUERYBUF:
-	{
-		struct v4l2_buffer *buf = arg;
-
-		return uvc_query_buffer(&video->queue, buf);
-	}
-
-	case VIDIOC_QBUF:
-		if ((ret = uvc_queue_buffer(&video->queue, arg)) < 0)
-			return ret;
-
-		return uvc_video_pump(video);
-
-	case VIDIOC_DQBUF:
-		return uvc_dequeue_buffer(&video->queue, arg,
-			file->f_flags & O_NONBLOCK);
-
-	case VIDIOC_STREAMON:
-	{
-		int *type = arg;
-
-		if (*type != video->queue.queue.type)
-			return -EINVAL;
-
-		/* Enable UVC video. */
-		ret = uvc_video_enable(video, 1);
-		if (ret < 0)
-			return ret;
-
-		/*
-		 * Complete the alternate setting selection setup phase now that
-		 * userspace is ready to provide video frames.
-		 */
-		uvc_function_setup_continue(uvc);
-		uvc->state = UVC_STATE_STREAMING;
-
-		return 0;
-	}
-
-	case VIDIOC_STREAMOFF:
-	{
-		int *type = arg;
-
-		if (*type != video->queue.queue.type)
-			return -EINVAL;
-
-		return uvc_video_enable(video, 0);
-	}
-
-	/* Events */
-	case VIDIOC_DQEVENT:
-	{
-		struct v4l2_event *event = arg;
-
-		ret = v4l2_event_dequeue(&handle->vfh, event,
-					 file->f_flags & O_NONBLOCK);
-		if (ret == 0 && event->type == UVC_EVENT_SETUP) {
-			struct uvc_event *uvc_event = (void *)&event->u.data;
-
-			/* Tell the complete callback to generate an event for
-			 * the next request that will be enqueued by
-			 * uvc_event_write.
-			 */
-			uvc->event_setup_out =
-				!(uvc_event->req.bRequestType & USB_DIR_IN);
-			uvc->event_length = uvc_event->req.wLength;
-		}
-
-		return ret;
-	}
-
-	case VIDIOC_SUBSCRIBE_EVENT:
-	{
-		struct v4l2_event_subscription *sub = arg;
-
-		if (sub->type < UVC_EVENT_FIRST || sub->type > UVC_EVENT_LAST)
-			return -EINVAL;
-
-		return v4l2_event_subscribe(&handle->vfh, arg, 2, NULL);
-	}
-
-	case VIDIOC_UNSUBSCRIBE_EVENT:
-		return v4l2_event_unsubscribe(&handle->vfh, arg);
-
-	case UVCIOC_SEND_RESPONSE:
-		ret = uvc_send_response(uvc, arg);
-		break;
-
-	default:
-		return -ENOIOCTLCMD;
-	}
-
-	return ret;
-}
-
-static long
-uvc_v4l2_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-	return video_usercopy(file, cmd, arg, uvc_v4l2_do_ioctl);
-}
-
 static int
 uvc_v4l2_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct video_device *vdev = video_devdata(file);
 	struct uvc_device *uvc = video_get_drvdata(vdev);
 
-	return uvc_queue_mmap(&uvc->video.queue, vma);
+	return uvcg_queue_mmap(&uvc->video.queue, vma);
 }
 
 static unsigned int
···
 	struct video_device *vdev = video_devdata(file);
 	struct uvc_device *uvc = video_get_drvdata(vdev);
 
-	return uvc_queue_poll(&uvc->video.queue, file, wait);
+	return uvcg_queue_poll(&uvc->video.queue, file, wait);
 }
 
 #ifndef CONFIG_MMU
···
 	struct video_device *vdev = video_devdata(file);
 	struct uvc_device *uvc = video_get_drvdata(vdev);
 
-	return uvc_queue_get_unmapped_area(&uvc->video.queue, pgoff);
+	return uvcg_queue_get_unmapped_area(&uvc->video.queue, pgoff);
 }
 #endif
 
-static struct v4l2_file_operations uvc_v4l2_fops = {
+struct v4l2_file_operations uvc_v4l2_fops = {
 	.owner		= THIS_MODULE,
 	.open		= uvc_v4l2_open,
 	.release	= uvc_v4l2_release,
-	.ioctl		= uvc_v4l2_ioctl,
+	.ioctl		= video_ioctl2,
 	.mmap		= uvc_v4l2_mmap,
 	.poll		= uvc_v4l2_poll,
 #ifndef CONFIG_MMU
-	.get_unmapped_area = uvc_v4l2_get_unmapped_area,
+	.get_unmapped_area = uvcg_v4l2_get_unmapped_area,
 #endif
 };
 

drivers/usb/gadget/function/uvc_v4l2.h

···
+/*
+ *	uvc_v4l2.h  --  USB Video Class Gadget driver
+ *
+ * Copyright (C) 2009-2010
+ *		Laurent Pinchart ([e-mail])
+ *
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *		Author: Andrzej Pietrasiewicz <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __UVC_V4L2_H__
+#define __UVC_V4L2_H__
+
+extern const struct v4l2_ioctl_ops uvc_v4l2_ioctl_ops;
+extern struct v4l2_file_operations uvc_v4l2_fops;
+
+#endif /* __UVC_V4L2_H__ */

drivers/usb/gadget/function/uvc_video.c

···
 #include <linux/errno.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
+#include <linux/usb/video.h>
 
 #include <media/v4l2-dev.h>
 
···
 	if (buf->bytesused == video->queue.buf_used) {
 		video->queue.buf_used = 0;
 		buf->state = UVC_BUF_STATE_DONE;
-		uvc_queue_next_buffer(&video->queue, buf);
+		uvcg_queue_next_buffer(&video->queue, buf);
 		video->fid ^= UVC_STREAM_FID;
 
 		video->payload_size = 0;
···
 	if (buf->bytesused == video->queue.buf_used) {
 		video->queue.buf_used = 0;
 		buf->state = UVC_BUF_STATE_DONE;
-		uvc_queue_next_buffer(&video->queue, buf);
+		uvcg_queue_next_buffer(&video->queue, buf);
 		video->fid ^= UVC_STREAM_FID;
 	}
 }
···
 		break;
 
 	case -ESHUTDOWN:	/* disconnect from host. */
-		printk(KERN_INFO "VS request cancelled.\n");
-		uvc_queue_cancel(queue, 1);
+		printk(KERN_DEBUG "VS request cancelled.\n");
+		uvcg_queue_cancel(queue, 1);
 		goto requeue;
 
 	default:
 		printk(KERN_INFO "VS request completed with status %d.\n",
 			req->status);
-		uvc_queue_cancel(queue, 0);
+		uvcg_queue_cancel(queue, 0);
 		goto requeue;
 	}
 
 	spin_lock_irqsave(&video->queue.irqlock, flags);
-	buf = uvc_queue_head(&video->queue);
+	buf = uvcg_queue_head(&video->queue);
 	if (buf == NULL) {
 		spin_unlock_irqrestore(&video->queue.irqlock, flags);
 		goto requeue;
···
 		printk(KERN_INFO "Failed to queue request (%d).\n", ret);
 		usb_ep_set_halt(ep);
 		spin_unlock_irqrestore(&video->queue.irqlock, flags);
-		uvc_queue_cancel(queue, 0);
+		uvcg_queue_cancel(queue, 0);
 		goto requeue;
 	}
 	spin_unlock_irqrestore(&video->queue.irqlock, flags);
···
  */
 
 /*
- * uvc_video_pump - Pump video data into the USB requests
+ * uvcg_video_pump - Pump video data into the USB requests
  *
  * This function fills the available USB requests (listed in req_free) with
  * video data from the queued buffers.
  */
-static int
-uvc_video_pump(struct uvc_video *video)
+int uvcg_video_pump(struct uvc_video *video)
 {
 	struct uvc_video_queue *queue = &video->queue;
 	struct usb_request *req;
···
 	unsigned long flags;
 	int ret;
 
-	/* FIXME TODO Race between uvc_video_pump and requests completion
+	/* FIXME TODO Race between uvcg_video_pump and requests completion
 	 * handler ???
 	 */
 
···
 		/* Retrieve the first available video buffer and fill the
 		 * request, protected by the video queue irqlock.
 		 */
-		spin_lock_irqsave(&video->queue.irqlock, flags);
-		buf = uvc_queue_head(&video->queue);
+		spin_lock_irqsave(&queue->irqlock, flags);
+		buf = uvcg_queue_head(queue);
 		if (buf == NULL) {
-			spin_unlock_irqrestore(&video->queue.irqlock, flags);
+			spin_unlock_irqrestore(&queue->irqlock, flags);
 			break;
 		}
 
···
 		if (ret < 0) {
 			printk(KERN_INFO "Failed to queue request (%d)\n", ret);
 			usb_ep_set_halt(video->ep);
-			spin_unlock_irqrestore(&video->queue.irqlock, flags);
-			uvc_queue_cancel(queue, 0);
+			spin_unlock_irqrestore(&queue->irqlock, flags);
+			uvcg_queue_cancel(queue, 0);
 			break;
 		}
-		spin_unlock_irqrestore(&video->queue.irqlock, flags);
+		spin_unlock_irqrestore(&queue->irqlock, flags);
 	}
 
 	spin_lock_irqsave(&video->req_lock, flags);
···
 /*
  * Enable or disable the video stream.
  */
-static int
-uvc_video_enable(struct uvc_video *video, int enable)
+int uvcg_video_enable(struct uvc_video *video, int enable)
 {
 	unsigned int i;
 	int ret;
···
 			usb_ep_dequeue(video->ep, video->req[i]);
 
 		uvc_video_free_requests(video);
-		uvc_queue_enable(&video->queue, 0);
+		uvcg_queue_enable(&video->queue, 0);
 		return 0;
 	}
 
-	if ((ret = uvc_queue_enable(&video->queue, 1)) < 0)
+	if ((ret = uvcg_queue_enable(&video->queue, 1)) < 0)
 		return ret;
 
 	if ((ret = uvc_video_alloc_requests(video)) < 0)
···
 	} else
 		video->encode = uvc_video_encode_isoc;
 
-	return uvc_video_pump(video);
+	return uvcg_video_pump(video);
 }
 
 /*
  * Initialize the UVC video stream.
  */
-static int
-uvc_video_init(struct uvc_video *video)
+int uvcg_video_init(struct uvc_video *video)
 {
 	INIT_LIST_HEAD(&video->req_free);
 	spin_lock_init(&video->req_lock);
···
 	video->imagesize = 320 * 240 * 2;
 
 	/* Initialize the video buffers queue. */
-	uvc_queue_init(&video->queue, V4L2_BUF_TYPE_VIDEO_OUTPUT);
+	uvcg_queue_init(&video->queue, V4L2_BUF_TYPE_VIDEO_OUTPUT);
 	return 0;
 }
 

drivers/usb/gadget/function/uvc_video.h

···
+/*
+ *	uvc_video.h  --  USB Video Class Gadget driver
+ *
+ * Copyright (C) 2009-2010
+ *		Laurent Pinchart ([e-mail])
+ *
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *		Author: Andrzej Pietrasiewicz <[e-mail]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __UVC_VIDEO_H__
+#define __UVC_VIDEO_H__
+
+int uvcg_video_pump(struct uvc_video *video);
+
+int uvcg_video_enable(struct uvc_video *video, int enable);
+
+int uvcg_video_init(struct uvc_video *video);
+
+#endif /* __UVC_VIDEO_H__ */

drivers/usb/gadget/legacy/Kconfig

···
 	depends on SND
 	select USB_LIBCOMPOSITE
 	select SND_PCM
+	select USB_F_UAC1 if GADGET_UAC1
+	select USB_F_UAC2 if !GADGET_UAC1
 	help
 	  This Gadget Audio driver is compatible with USB Audio Class
 	  specification 2.0. It implements 1 AudioControl interface,
···
 	depends on VIDEO_DEV
 	select USB_LIBCOMPOSITE
 	select VIDEOBUF2_VMALLOC
+	select USB_F_UVC
 	help
 	  The Webcam Gadget acts as a composite USB Audio and Video Class
 	  device. It provides a userspace API to process UVC control requests

drivers/usb/gadget/legacy/Makefile

···
 # USB gadget drivers
 #
 
-ccflags-y			:= -Idrivers/usb/gadget/
-ccflags-y			+= -Idrivers/usb/gadget/udc/
-ccflags-y			+= -Idrivers/usb/gadget/function/
+ccflags-y			:= -I$(srctree)/drivers/usb/gadget/
+ccflags-y			+= -I$(srctree)/drivers/usb/gadget/udc/
+ccflags-y			+= -I$(srctree)/drivers/usb/gadget/function/
 
 g_zero-y			:= zero.o
 g_audio-y			:= audio.o

drivers/usb/gadget/legacy/audio.c

···
 
 USB_GADGET_COMPOSITE_OPTIONS();
 
+#ifndef CONFIG_GADGET_UAC1
+#include "u_uac2.h"
+
+/* Playback(USB-IN) Default Stereo - Fl/Fr */
+static int p_chmask = UAC2_DEF_PCHMASK;
+module_param(p_chmask, uint, S_IRUGO);
+MODULE_PARM_DESC(p_chmask, "Playback Channel Mask");
+
+/* Playback Default 48 KHz */
+static int p_srate = UAC2_DEF_PSRATE;
+module_param(p_srate, uint, S_IRUGO);
+MODULE_PARM_DESC(p_srate, "Playback Sampling Rate");
+
+/* Playback Default 16bits/sample */
+static int p_ssize = UAC2_DEF_PSSIZE;
+module_param(p_ssize, uint, S_IRUGO);
+MODULE_PARM_DESC(p_ssize, "Playback Sample Size(bytes)");
+
+/* Capture(USB-OUT) Default Stereo - Fl/Fr */
+static int c_chmask = UAC2_DEF_CCHMASK;
+module_param(c_chmask, uint, S_IRUGO);
+MODULE_PARM_DESC(c_chmask, "Capture Channel Mask");
+
+/* Capture Default 64 KHz */
+static int c_srate = UAC2_DEF_CSRATE;
+module_param(c_srate, uint, S_IRUGO);
+MODULE_PARM_DESC(c_srate, "Capture Sampling Rate");
+
+/* Capture Default 16bits/sample */
+static int c_ssize = UAC2_DEF_CSSIZE;
+module_param(c_ssize, uint, S_IRUGO);
+MODULE_PARM_DESC(c_ssize, "Capture Sample Size(bytes)");
+#else
+#include "u_uac1.h"
+
+static char *fn_play = FILE_PCM_PLAYBACK;
+module_param(fn_play, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_play, "Playback PCM device file name");
+
+static char *fn_cap = FILE_PCM_CAPTURE;
+module_param(fn_cap, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_cap, "Capture PCM device file name");
+
+static char *fn_cntl = FILE_CONTROL;
+module_param(fn_cntl, charp, S_IRUGO);
+MODULE_PARM_DESC(fn_cntl, "Control device file name");
+
+static int req_buf_size = UAC1_OUT_EP_MAX_PACKET_SIZE;
+module_param(req_buf_size, int, S_IRUGO);
+MODULE_PARM_DESC(req_buf_size, "ISO OUT endpoint request buffer size");
+
+static int req_count = UAC1_REQ_COUNT;
+module_param(req_count, int, S_IRUGO);
+MODULE_PARM_DESC(req_count, "ISO OUT endpoint request count");
+
+static int audio_buf_size = UAC1_AUDIO_BUF_SIZE;
+module_param(audio_buf_size, int, S_IRUGO);
+MODULE_PARM_DESC(audio_buf_size, "Audio buffer size");
+#endif
+
 /* string IDs are assigned dynamically */
 
 static struct usb_string strings_dev[] = {
···
 	NULL,
 };
 
-#ifdef CONFIG_GADGET_UAC1
-#include "u_uac1.h"
-#include "u_uac1.c"
-#include "f_uac1.c"
+#ifndef CONFIG_GADGET_UAC1
+static struct usb_function_instance *fi_uac2;
+static struct usb_function *f_uac2;
 #else
-#include "f_uac2.c"
+static struct usb_function_instance *fi_uac1;
+static struct usb_function *f_uac1;
 #endif
 
 /*-------------------------------------------------------------------------*/
···
 
 static int __init audio_do_config(struct usb_configuration *c)
 {
+	int status;
+
 	/* FIXME alloc iConfiguration string, set it in c->strings */
 
 	if (gadget_is_otg(c->cdev->gadget)) {
···
 		c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
 	}
 
-	audio_bind_config(c);
+#ifdef CONFIG_GADGET_UAC1
+	f_uac1 = usb_get_function(fi_uac1);
+	if (IS_ERR(f_uac1)) {
+		status = PTR_ERR(f_uac1);
+		return status;
+	}
+
+	status = usb_add_function(c, f_uac1);
+	if (status < 0) {
+		usb_put_function(f_uac1);
+		return status;
+	}
+#else
+	f_uac2 = usb_get_function(fi_uac2);
+	if (IS_ERR(f_uac2)) {
+		status = PTR_ERR(f_uac2);
+		return status;
+	}
+
+	status = usb_add_function(c, f_uac2);
+	if (status < 0) {
+		usb_put_function(f_uac2);
+		return status;
+	}
+#endif
 
 	return 0;
 }
···
 	.bConfigurationValue	= 1,
 	/* .iConfiguration = DYNAMIC */
 	.bmAttributes		= USB_CONFIG_ATT_SELFPOWER,
-#ifndef CONFIG_GADGET_UAC1
-	.unbind			= uac2_unbind_config,
-#endif
 };
 
 /*-------------------------------------------------------------------------*/
 
 static int __init audio_bind(struct usb_composite_dev *cdev)
 {
+#ifndef CONFIG_GADGET_UAC1
+	struct f_uac2_opts	*uac2_opts;
+#else
+	struct f_uac1_opts	*uac1_opts;
+#endif
 	int			status;
+
+#ifndef CONFIG_GADGET_UAC1
+	fi_uac2 = usb_get_function_instance("uac2");
+	if (IS_ERR(fi_uac2))
+		return PTR_ERR(fi_uac2);
+#else
+	fi_uac1 = usb_get_function_instance("uac1");
+	if (IS_ERR(fi_uac1))
+		return PTR_ERR(fi_uac1);
+#endif
+
+#ifndef CONFIG_GADGET_UAC1
+	uac2_opts = container_of(fi_uac2, struct f_uac2_opts, func_inst);
+	uac2_opts->p_chmask = p_chmask;
+	uac2_opts->p_srate = p_srate;
+	uac2_opts->p_ssize = p_ssize;
+	uac2_opts->c_chmask = c_chmask;
+	uac2_opts->c_srate = c_srate;
+	uac2_opts->c_ssize = c_ssize;
+#else
+	uac1_opts = container_of(fi_uac1, struct f_uac1_opts, func_inst);
+	uac1_opts->fn_play = fn_play;
+	uac1_opts->fn_cap = fn_cap;
+	uac1_opts->fn_cntl = fn_cntl;
+	uac1_opts->req_buf_size = req_buf_size;
+	uac1_opts->req_count = req_count;
+	uac1_opts->audio_buf_size = audio_buf_size;
+#endif
 
 	status = usb_string_ids_tab(cdev, strings_dev);
 	if (status < 0)
···
 	return 0;
 
 fail:
+#ifndef CONFIG_GADGET_UAC1
+	usb_put_function_instance(fi_uac2);
+#else
+	usb_put_function_instance(fi_uac1);
+#endif
 	return status;
 }
 
 static int __exit audio_unbind(struct usb_composite_dev *cdev)
 {
 #ifdef CONFIG_GADGET_UAC1
-	gaudio_cleanup();
+	if (!IS_ERR_OR_NULL(f_uac1))
+		usb_put_function(f_uac1);
+	if (!IS_ERR_OR_NULL(fi_uac1))
+		usb_put_function_instance(fi_uac1);
+#else
+	if (!IS_ERR_OR_NULL(f_uac2))
+		usb_put_function(f_uac2);
+	if (!IS_ERR_OR_NULL(fi_uac2))
+		usb_put_function_instance(fi_uac2);
 #endif
 	return 0;
 }

drivers/usb/gadget/legacy/dbgp.c

···
 	.bind = dbgp_bind,
 	.unbind = dbgp_unbind,
 	.setup = dbgp_setup,
+	.reset = dbgp_disconnect,
 	.disconnect = dbgp_disconnect,
 	.driver	= {
 		.owner = THIS_MODULE,

drivers/usb/gadget/legacy/inode.c

···
 	.bind		= gadgetfs_bind,
 	.unbind		= gadgetfs_unbind,
 	.setup		= gadgetfs_setup,
+	.reset		= gadgetfs_disconnect,
 	.disconnect	= gadgetfs_disconnect,
 	.suspend	= gadgetfs_suspend,
 

drivers/usb/gadget/legacy/webcam.c

···
 
 #include <linux/kernel.h>
 #include <linux/device.h>
+#include <linux/module.h>
 #include <linux/usb/video.h>
 
-#include "f_uvc.h"
-
-/*
- * Kbuild is not very cooperative with respect to linking separately
- * compiled library objects into one module.  So for now we won't use
- * separate compilation ... ensuring init/exit sections work to shrink
- * the runtime footprint, and giving us at least some parts of what
- * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
- */
-#include "uvc_queue.c"
-#include "uvc_video.c"
-#include "uvc_v4l2.c"
-#include "f_uvc.c"
+#include "u_uvc.h"
 
 USB_GADGET_COMPOSITE_OPTIONS();
+
+/*-------------------------------------------------------------------------*/
+
+/* module parameters specific to the Video streaming endpoint */
+static unsigned int streaming_interval = 1;
+module_param(streaming_interval, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(streaming_interval, "1 - 16");
+
+static unsigned int streaming_maxpacket = 1024;
+module_param(streaming_maxpacket, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(streaming_maxpacket, "1 - 1023 (FS), 1 - 3072 (hs/ss)");
+
+static unsigned int streaming_maxburst;
+module_param(streaming_maxburst, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(streaming_maxburst, "0 - 15 (ss only)");
+
+static unsigned int trace;
+module_param(trace, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(trace, "Trace level bitmask");
 /* --------------------------------------------------------------------------
  * Device descriptor
  */
···
 	&webcam_stringtab,
 	NULL,
 };
+
+static struct usb_function_instance *fi_uvc;
+static struct usb_function *f_uvc;
 
 static struct usb_device_descriptor webcam_device_descriptor = {
 	.bLength		= USB_DT_DEVICE_SIZE,
···
 static int __init
 webcam_config_bind(struct usb_configuration *c)
 {
-	return uvc_bind_config(c, uvc_fs_control_cls, uvc_ss_control_cls,
-		uvc_fs_streaming_cls, uvc_hs_streaming_cls,
-		uvc_ss_streaming_cls);
+	int status = 0;
+
+	f_uvc = usb_get_function(fi_uvc);
+	if (IS_ERR(f_uvc))
+		return PTR_ERR(f_uvc);
+
+	status = usb_add_function(c, f_uvc);
+	if (status < 0)
+		usb_put_function(f_uvc);
+
+	return status;
 }
 
 static struct usb_configuration webcam_config_driver = {
···
 static int /* __init_or_exit */
 webcam_unbind(struct usb_composite_dev *cdev)
 {
+	if (!IS_ERR_OR_NULL(f_uvc))
+		usb_put_function(f_uvc);
+	if (!IS_ERR_OR_NULL(fi_uvc))
+		usb_put_function_instance(fi_uvc);
 	return 0;
 }
 
 static int __init
 webcam_bind(struct usb_composite_dev *cdev)
 {
+	struct f_uvc_opts *uvc_opts;
 	int ret;
+
+	fi_uvc = usb_get_function_instance("uvc");
+	if (IS_ERR(fi_uvc))
+		return PTR_ERR(fi_uvc);
+
+	uvc_opts = container_of(fi_uvc, struct f_uvc_opts, func_inst);
+
+	uvc_opts->streaming_interval = streaming_interval;
+	uvc_opts->streaming_maxpacket = streaming_maxpacket;
+	uvc_opts->streaming_maxburst = streaming_maxburst;
+	uvc_set_trace_param(trace);
+
+	uvc_opts->fs_control = uvc_fs_control_cls;
+	uvc_opts->ss_control = uvc_ss_control_cls;
+	uvc_opts->fs_streaming = uvc_fs_streaming_cls;
+	uvc_opts->hs_streaming = uvc_hs_streaming_cls;
+	uvc_opts->ss_streaming = uvc_ss_streaming_cls;
 
 	/* Allocate string descriptor numbers ... note that string contents
 	 * can be overridden by the composite_dev glue.
···
 	return 0;
 
 error:
-	webcam_unbind(cdev);
+	usb_put_function_instance(fi_uvc);
 	return ret;
 }
 

drivers/usb/gadget/legacy/zero.c

···
 	.isoc_maxpacket = GZERO_ISOC_MAXPACKET,
 	.bulk_buflen = GZERO_BULK_BUFLEN,
 	.qlen = GZERO_QLEN,
+	.int_interval = GZERO_INT_INTERVAL,
+	.int_maxpacket = GZERO_INT_MAXPACKET,
 };
 
 /*-------------------------------------------------------------------------*/
···
 		S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(isoc_maxburst, "0 - 15 (ss only)");
 
+module_param_named(int_interval, gzero_options.int_interval, uint,
+		S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(int_interval, "1 - 16");
+
+module_param_named(int_maxpacket, gzero_options.int_maxpacket, uint,
+		S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(int_maxpacket, "0 - 1023 (fs), 0 - 1024 (hs/ss)");
+
+module_param_named(int_mult, gzero_options.int_mult, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(int_mult, "0 - 2 (hs/ss only)");
+
+module_param_named(int_maxburst, gzero_options.int_maxburst, uint,
+		S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(int_maxburst, "0 - 15 (ss only)");
+
 static struct usb_function *func_lb;
 static struct usb_function_instance *func_inst_lb;
 
···
 	ss_opts->isoc_maxpacket = gzero_options.isoc_maxpacket;
 	ss_opts->isoc_mult = gzero_options.isoc_mult;
 	ss_opts->isoc_maxburst = gzero_options.isoc_maxburst;
+	ss_opts->int_interval = gzero_options.int_interval;
+	ss_opts->int_maxpacket = gzero_options.int_maxpacket;
+	ss_opts->int_mult = gzero_options.int_mult;
+	ss_opts->int_maxburst = gzero_options.int_maxburst;
 	ss_opts->bulk_buflen = gzero_options.bulk_buflen;
 
 	func_ss = usb_get_function(func_inst_ss);

drivers/usb/gadget/udc/Kconfig

···
 
 config USB_RENESAS_USBHS_UDC
 	tristate 'Renesas USBHS controller'
-	depends on USB_RENESAS_USBHS
+	depends on USB_RENESAS_USBHS && HAS_DMA
 	help
 	   Renesas USBHS is a discrete USB host and peripheral controller chip
 	   that supports both full and high speed USB 2.0 data transfers.
···
 	  ML7213/ML7831 is completely compatible for Intel EG20T PCH.
 
 	  This driver can be used with Intel's Quark X1000 SOC platform
+
+config USB_GADGET_XILINX
+	tristate "Xilinx USB Driver"
+	depends on OF || COMPILE_TEST
+	help
+	  USB peripheral controller driver for Xilinx USB2 device.
+	  Xilinx USB2 device is a soft IP which supports both full
+	  and high speed USB 2.0 data transfers. It has seven configurable
+	  endpoints(bulk or interrupt or isochronous), as well as
+	  endpoint zero(for control transfers).
+
+	  Say "y" to link the driver statically, or "m" to build a
+	  dynamically linked module called "udc-xilinx" and force all
+	  gadget drivers to also be dynamically linked.
+
 #
 # LAST -- dummy/emulated controller
 #

drivers/usb/gadget/udc/Makefile

···
 obj-$(CONFIG_USB_FOTG210_UDC)	+= fotg210-udc.o
 obj-$(CONFIG_USB_MV_U3D)	+= mv_u3d_core.o
 obj-$(CONFIG_USB_GR_UDC)	+= gr_udc.o
+obj-$(CONFIG_USB_GADGET_XILINX)	+= udc-xilinx.o

drivers/usb/gadget/udc/gr_udc.c

···
 	usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
 	gr_free_dma_desc_chain(dev, req);
 
-	if (ep->is_in) /* For OUT, actual gets updated bit by bit */
+	if (ep->is_in) { /* For OUT, req->req.actual gets updated bit by bit */
 		req->req.actual = req->req.length;
+	} else if (req->oddlen && req->req.actual > req->evenlen) {
+		/*
+		 * Copy to user buffer in this case where length was not evenly
+		 * divisible by ep->ep.maxpacket and the last descriptor was
+		 * actually used.
+		 */
+		char *buftail = ((char *)req->req.buf + req->evenlen);
+
+		memcpy(buftail, ep->tailbuf, req->oddlen);
+
+		if (req->req.actual > req->req.length) {
+			/* We got more data than was requested */
+			dev_dbg(ep->dev->dev, "Overflow for ep %s\n",
+				ep->ep.name);
+			gr_dbgprint_request("OVFL", ep, req);
+			req->req.status = -EOVERFLOW;
+		}
+	}
 
 	if (!status) {
 		if (ep->is_in)
···
 
 	/* A descriptor should already have been allocated */
 	BUG_ON(!req->curr_desc);
+
+	/*
+	 * The DMA controller can not handle smaller OUT buffers than
+	 * ep->ep.maxpacket. It could lead to buffer overruns if an unexpectedly
+	 * long packet are received. Therefore an internal bounce buffer gets
+	 * used when such a request gets enabled.
+	 */
+	if (!ep->is_in && req->oddlen)
+		req->last_desc->data = ep->tailbuf_paddr;
 
 	wmb(); /* Make sure all is settled before handing it over to DMA */
 
···
 		dma_addr_t start = req->req.dma + bytes_used;
 		u16 size = min(bytes_left, ep->bytes_per_buffer);
 
-		/* Should not happen however - gr_queue stops such lengths */
-		if (size < ep->bytes_per_buffer)
-			dev_warn(ep->dev->dev,
-				 "Buffer overrun risk: %u < %u bytes/buffer\n",
-				 size, ep->bytes_per_buffer);
+		if (size < ep->bytes_per_buffer) {
+			/* Prepare using bounce buffer */
+			req->evenlen = req->req.length - bytes_left;
+			req->oddlen = size;
+		}
 
 		ret = gr_add_dma_desc(ep, req, start, size, gfp_flags);
 		if (ret)
···
 			"Invalid request for %s: buf=%p list_empty=%d\n",
 			ep->ep.name, req->req.buf, list_empty(&req->queue));
 		return -EINVAL;
-	}
-
-	/*
-	 * The DMA controller can not handle smaller OUT buffers than
-	 * maxpacket. It could lead to buffer overruns if unexpectedly long
-	 * packet are received.
-	 */
-	if (!ep->is_in && (req->req.length % ep->ep.maxpacket) != 0) {
-		dev_err(dev->dev,
-			"OUT request length %d is not multiple of maxpacket\n",
-			req->req.length);
-		return -EMSGSIZE;
 	}
 
 	if (unlikely(!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)) {
···
 	if (ctrl & GR_DESC_OUT_CTRL_SE)
 		req->setup = 1;
 
-	if (len < ep->ep.maxpacket || req->req.actual == req->req.length) {
-		/* Short packet or the expected size - we are done */
+	if (len < ep->ep.maxpacket || req->req.actual >= req->req.length) {
+		/* Short packet or >= expected size - we are done */
 
 		if ((ep == &dev->epo[0]) && (dev->ep0state == GR_EP0_OSTATUS)) {
 			/*
···
 	}
 	list_add_tail(&ep->ep_list, &dev->ep_list);
 
+	ep->tailbuf = dma_alloc_coherent(dev->dev, ep->ep.maxpacket_limit,
+					 &ep->tailbuf_paddr, GFP_ATOMIC);
+	if (!ep->tailbuf)
+		return -ENOMEM;
+
 	return 0;
 }
 
···
 	return 0;
 }
 
+static void gr_ep_remove(struct gr_udc *dev, int num, int is_in)
+{
+	struct gr_ep *ep;
+
+	if (is_in)
+		ep = &dev->epi[num];
+	else
+		ep = &dev->epo[num];
+
+	if (ep->tailbuf)
+		dma_free_coherent(dev->dev, ep->ep.maxpacket_limit,
+				  ep->tailbuf, ep->tailbuf_paddr);
+}
+
 static int gr_remove(struct platform_device *pdev)
 {
 	struct gr_udc *dev = platform_get_drvdata(pdev);
+	int i;
 
 	if (dev->added)
 		usb_del_gadget_udc(&dev->gadget); /* Shuts everything down */
···
 
 	gr_free_request(&dev->epi[0].ep, &dev->ep0reqi->req);
 	gr_free_request(&dev->epo[0].ep, &dev->ep0reqo->req);
+
+	for (i = 0; i < dev->nepo; i++)
+		gr_ep_remove(dev, i, 0);
+	for (i = 0; i < dev->nepi; i++)
+		gr_ep_remove(dev, i, 1);
 
 	return 0;
 }
···
 	dev->gadget.name = driver_name;
 	dev->gadget.max_speed = USB_SPEED_HIGH;
 	dev->gadget.ops = &gr_ops;
-	dev->gadget.quirk_ep_out_aligned_size = true;
 
 	spin_lock_init(&dev->lock);
 	dev->regs = regs;

drivers/usb/gadget/udc/gr_udc.h

···
 	struct list_head queue;
 
 	struct list_head ep_list;
+
+	/* Bounce buffer for end of "odd" sized OUT requests */
+	void *tailbuf;
+	dma_addr_t tailbuf_paddr;
 };
 
 struct gr_request {
···
 	struct gr_dma_desc *first_desc; /* First in the chain */
 	struct gr_dma_desc *curr_desc; /* Current descriptor */
 	struct gr_dma_desc *last_desc; /* Last in the chain */
+
+	u16 evenlen; /* Size of even length head (if oddlen != 0) */
+	u16 oddlen; /* Size of odd length tail if buffer length is "odd" */
 
 	u8 setup; /* Setup packet */
 };

drivers/usb/gadget/udc/r8a66597-udc.c

···
 	ep->pipenum = pipenum;
 	ep->ep.maxpacket = usb_endpoint_maxp(desc);
 	r8a66597->pipenum2ep[pipenum] = ep;
-	r8a66597->epaddr2ep[desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK]
+	r8a66597->epaddr2ep[usb_endpoint_num(desc)]
 		= ep;
 	INIT_LIST_HEAD(&ep->queue);
 }
···
 	if (ep->pipenum)	/* already allocated pipe  */
 		return 0;
 
-	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	switch (usb_endpoint_type(desc)) {
 	case USB_ENDPOINT_XFER_BULK:
 		if (r8a66597->bulk >= R8A66597_MAX_NUM_BULK) {
 			if (r8a66597->isochronous >= R8A66597_MAX_NUM_ISOC) {
···
 	}
 	ep->type = info.type;
 
-	info.epnum = desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+	info.epnum = usb_endpoint_num(desc);
 	info.maxpacket = usb_endpoint_maxp(desc);
 	info.interval = desc->bInterval;
 	if (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
···
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sudmac");
 	r8a66597->sudmac_reg = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(r8a66597->sudmac_reg)) {
-		dev_err(&pdev->dev, "ioremap error(sudmac).\n");
+	if (IS_ERR(r8a66597->sudmac_reg))
 		return PTR_ERR(r8a66597->sudmac_reg);
-	}
 
 	return 0;
 }

drivers/usb/gadget/udc/udc-core.c

···
 static void usb_gadget_state_work(struct work_struct *work)
 {
 	struct usb_gadget	*gadget = work_to_gadget(work);
+	struct usb_udc		*udc = NULL;
 
-	sysfs_notify(&gadget->dev.kobj, NULL, "state");
+	mutex_lock(&udc_lock);
+	list_for_each_entry(udc, &udc_list, list)
+		if (udc->gadget == gadget)
+			goto found;
+	mutex_unlock(&udc_lock);
+
+	return;
+
+found:
+	mutex_unlock(&udc_lock);
+
+	sysfs_notify(&udc->dev.kobj, NULL, "state");
 }
 
 void usb_gadget_set_state(struct usb_gadget *gadget,
···
 EXPORT_SYMBOL_GPL(usb_gadget_set_state);
 
 /* ------------------------------------------------------------------------- */
+
+/**
+ * usb_gadget_udc_reset - notifies the udc core that bus reset occurs
+ * @gadget: The gadget which bus reset occurs
+ * @driver: The gadget driver we want to notify
+ *
+ * If the udc driver has bus reset handler, it needs to call this when the bus
+ * reset occurs, it notifies the gadget driver that the bus reset occurs as
+ * well as updates gadget state.
+ */
+void usb_gadget_udc_reset(struct usb_gadget *gadget,
+		struct usb_gadget_driver *driver)
+{
+	driver->reset(gadget);
+	usb_gadget_set_state(gadget, USB_STATE_DEFAULT);
+}
+EXPORT_SYMBOL_GPL(usb_gadget_udc_reset);
 
 /**
  * usb_gadget_udc_start - tells usb device controller to start up

drivers/usb/gadget/udc/udc-xilinx.c

···
+/*
+ * Xilinx USB peripheral controller driver
+ *
+ * Copyright (C) 2004 by Thomas Rathbone
+ * Copyright (C) 2005 by HP Labs
+ * Copyright (C) 2005 by David Brownell
+ * Copyright (C) 2010 - 2014 Xilinx, Inc.
+ *
+ * Some parts of this driver code is based on the driver for at91-series
+ * USB peripheral controller (at91_udc.c).
+ *
+ * This program is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation;
+ * either version 2 of the License, or (at your option) any
+ * later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/prefetch.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+
+/* Register offsets for the USB device.*/
+#define XUSB_EP0_CONFIG_OFFSET		0x0000  /* EP0 Config Reg Offset */
+#define XUSB_SETUP_PKT_ADDR_OFFSET	0x0080  /* Setup Packet Address */
+#define XUSB_ADDRESS_OFFSET		0x0100  /* Address Register */
+#define XUSB_CONTROL_OFFSET		0x0104  /* Control Register */
+#define XUSB_STATUS_OFFSET		0x0108  /* Status Register */
+#define XUSB_FRAMENUM_OFFSET		0x010C	/* Frame Number Register */
+#define XUSB_IER_OFFSET			0x0110	/* Interrupt Enable Register */
+#define XUSB_BUFFREADY_OFFSET		0x0114	/* Buffer Ready Register */
+#define XUSB_TESTMODE_OFFSET		0x0118	/* Test Mode Register */
+#define XUSB_DMA_RESET_OFFSET		0x0200  /* DMA Soft Reset Register */
+#define XUSB_DMA_CONTROL_OFFSET		0x0204	/* DMA Control Register */
+#define XUSB_DMA_DSAR_ADDR_OFFSET	0x0208	/* DMA source Address Reg */
+#define XUSB_DMA_DDAR_ADDR_OFFSET	0x020C	/* DMA destination Addr Reg */
+#define XUSB_DMA_LENGTH_OFFSET		0x0210	/* DMA Length Register */
+#define XUSB_DMA_STATUS_OFFSET		0x0214	/* DMA Status Register */
+
+/* Endpoint Configuration Space offsets */
+#define XUSB_EP_CFGSTATUS_OFFSET	0x00	/* Endpoint Config Status  */
+#define XUSB_EP_BUF0COUNT_OFFSET	0x08	/* Buffer 0 Count */
+#define XUSB_EP_BUF1COUNT_OFFSET	0x0C	/* Buffer 1 Count */
+
+#define XUSB_CONTROL_USB_READY_MASK	0x80000000 /* USB ready Mask */
+#define XUSB_CONTROL_USB_RMTWAKE_MASK	0x40000000 /* Remote wake up mask */
+
+/* Interrupt register related masks.*/
+#define XUSB_STATUS_GLOBAL_INTR_MASK	0x80000000 /* Global Intr Enable */
+#define XUSB_STATUS_DMADONE_MASK	0x04000000 /* DMA done Mask */
+#define XUSB_STATUS_DMAERR_MASK		0x02000000 /* DMA Error Mask */
+#define XUSB_STATUS_DMABUSY_MASK	0x80000000 /* DMA Error Mask */
+#define XUSB_STATUS_RESUME_MASK		0x01000000 /* USB Resume Mask */
+#define XUSB_STATUS_RESET_MASK		0x00800000 /* USB Reset Mask */
+#define XUSB_STATUS_SUSPEND_MASK	0x00400000 /* USB Suspend Mask */
+#define XUSB_STATUS_DISCONNECT_MASK	0x00200000 /* USB Disconnect Mask */
+#define XUSB_STATUS_FIFO_BUFF_RDY_MASK	0x00100000 /* FIFO Buff Ready Mask */
+#define XUSB_STATUS_FIFO_BUFF_FREE_MASK	0x00080000 /* FIFO Buff Free Mask */
+#define XUSB_STATUS_SETUP_PACKET_MASK	0x00040000 /* Setup packet received */
+#define XUSB_STATUS_EP1_BUFF2_COMP_MASK	0x00000200 /* EP 1 Buff 2 Processed */
+#define XUSB_STATUS_EP1_BUFF1_COMP_MASK	0x00000002 /* EP 1 Buff 1 Processed */
+#define XUSB_STATUS_EP0_BUFF2_COMP_MASK	0x00000100 /* EP 0 Buff 2 Processed */
+#define XUSB_STATUS_EP0_BUFF1_COMP_MASK	0x00000001 /* EP 0 Buff 1 Processed */
+#define XUSB_STATUS_HIGH_SPEED_MASK	0x00010000 /* USB Speed Mask */
+/* Suspend,Reset,Suspend and Disconnect Mask */
+#define XUSB_STATUS_INTR_EVENT_MASK	0x01E00000
+/* Buffers  completion Mask */
+#define XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK	0x0000FEFF
+/* Mask for buffer 0 and buffer 1 completion for all Endpoints */
+#define XUSB_STATUS_INTR_BUFF_COMP_SHIFT_MASK	0x00000101
+#define XUSB_STATUS_EP_BUFF2_SHIFT	8	   /* EP buffer offset */
+
+/* Endpoint Configuration Status Register */
+#define XUSB_EP_CFG_VALID_MASK		0x80000000 /* Endpoint Valid bit */
+#define XUSB_EP_CFG_STALL_MASK		0x40000000 /* Endpoint Stall bit */
+#define XUSB_EP_CFG_DATA_TOGGLE_MASK	0x08000000 /* Endpoint Data toggle */
+
+/* USB device specific global configuration constants.*/
+#define XUSB_MAX_ENDPOINTS		8	/* Maximum End Points */
+#define XUSB_EP_NUMBER_ZERO		0	/* End point Zero */
+/* DPRAM is the source address for DMA transfer */
+#define XUSB_DMA_READ_FROM_DPRAM	0x80000000
+#define XUSB_DMA_DMASR_BUSY		0x80000000 /* DMA busy */
+#define XUSB_DMA_DMASR_ERROR		0x40000000 /* DMA Error */
+/*
+ * When this bit is set, the DMA buffer ready bit is set by hardware upon
+ * DMA transfer completion.
+ */
+#define XUSB_DMA_BRR_CTRL		0x40000000 /* DMA bufready ctrl bit */
+/* Phase States */
+#define SETUP_PHASE			0x0000	/* Setup Phase */
+#define DATA_PHASE			0x0001  /* Data Phase */
+#define STATUS_PHASE			0x0002  /* Status Phase */
+
+#define EP0_MAX_PACKET		64 /* Endpoint 0 maximum packet length */
+#define STATUSBUFF_SIZE		2  /* Buffer size for GET_STATUS command */
+#define EPNAME_SIZE		4  /* Buffer size for endpoint name */
+
+/* container_of helper macros */
+#define to_udc(g)	 container_of((g), struct xusb_udc, gadget)
+#define to_xusb_ep(ep)	 container_of((ep), struct xusb_ep, ep_usb)
+#define to_xusb_req(req) container_of((req), struct xusb_req, usb_req)
+
+/**
+ * struct xusb_req - Xilinx USB device request structure
+ * @usb_req: Linux usb request structure
+ * @queue: usb device request queue
+ * @ep: pointer to xusb_endpoint structure
+ */
+struct xusb_req {
+	struct usb_request usb_req;
+	struct list_head queue;
+	struct xusb_ep *ep;
+};
+
+/**
+ * struct xusb_ep - USB end point structure.
+ * @ep_usb: usb endpoint instance
+ * @queue: endpoint message queue
+ * @udc: xilinx usb peripheral driver instance pointer
+ * @desc: pointer to the usb endpoint descriptor
+ * @rambase: the endpoint buffer address
+ * @offset: the endpoint register offset value
+ * @name: name of the endpoint
+ * @epnumber: endpoint number
+ * @maxpacket: maximum packet size the endpoint can store
+ * @buffer0count: the size of the packet recieved in the first buffer
+ * @buffer1count: the size of the packet received in the second buffer
+ * @curbufnum: current buffer of endpoint that will be processed next
+ * @buffer0ready: the busy state of first buffer
+ * @buffer1ready: the busy state of second buffer
+ * @is_in: endpoint direction (IN or OUT)
+ * @is_iso: endpoint type(isochronous or non isochronous)
+ */
+struct xusb_ep {
+	struct usb_ep ep_usb;
+	struct list_head queue;
+	struct xusb_udc *udc;
+	const struct usb_endpoint_descriptor *desc;
+	u32  rambase;
+	u32  offset;
+	char name[4];
+	u16  epnumber;
+	u16  maxpacket;
+	u16  buffer0count;
+	u16  buffer1count;
+	u8   curbufnum;
+	bool buffer0ready;
+	bool buffer1ready;
+	bool is_in;
+	bool is_iso;
+};
+
+/**
+ * struct xusb_udc -  USB peripheral driver structure
+ * @gadget: USB gadget driver instance
+ * @ep: an array of endpoint structures
+ * @driver: pointer to the usb gadget driver instance
+ * @setup: usb_ctrlrequest structure for control requests
+ * @req: pointer to dummy request for get status command
+ * @dev: pointer to device structure in gadget
+ * @usb_state: device in suspended state or not
+ * @remote_wkp: remote wakeup enabled by host
+ * @setupseqtx: tx status
+ * @setupseqrx: rx status
+ * @addr: the usb device base address
+ * @lock: instance of spinlock
+ * @dma_enabled: flag indicating whether the dma is included in the system
+ * @read_fn: function pointer to read device registers
+ * @write_fn: function pointer to write to device registers
+ */
+struct xusb_udc {
+	struct usb_gadget gadget;
+	struct xusb_ep ep[8];
+	struct usb_gadget_driver *driver;
+	struct usb_ctrlrequest setup;
+	struct xusb_req *req;
+	struct device *dev;
+	u32 usb_state;
+	u32 remote_wkp;
+	u32 setupseqtx;
+	u32 setupseqrx;
+	void __iomem *addr;
+	spinlock_t lock;
+	bool dma_enabled;
+
+	unsigned int (*read_fn)(void __iomem *);
+	void (*write_fn)(void __iomem *, u32, u32);
+};
+
+/* Endpoint buffer start addresses in the core */
+static u32 rambase[8] = { 0x22, 0x1000, 0x1100, 0x1200, 0x1300, 0x1400, 0x1500,
+			  0x1600 };
+
+static const char driver_name[] = "xilinx-udc";
+static const char ep0name[] = "ep0";
+
+/* Control endpoint configuration.*/
+static const struct usb_endpoint_descriptor config_bulk_out_desc = {
+	.bLength		= USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType	= USB_DT_ENDPOINT,
+	.bEndpointAddress	= USB_DIR_OUT,
+	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize		= cpu_to_le16(EP0_MAX_PACKET),
+};
+
+/**
+ * xudc_write32 - little endian write to device registers
+ * @addr: base addr of device registers
+ * @offset: register offset
+ * @val: data to be written
+ */
+static void xudc_write32(void __iomem *addr, u32 offset, u32 val)
+{
+	iowrite32(val, addr + offset);
+}
+
+/**
+ * xudc_read32 - little endian read from device registers
+ * @addr: addr of device register
+ * Return: value at addr
+ */
+static unsigned int xudc_read32(void __iomem *addr)
+{
+	return ioread32(addr);
+}
+
+/**
+ * xudc_write32_be - big endian write to device registers
+ * @addr: base addr of device registers
+ * @offset: register offset
+ * @val: data to be written
+ */
+static void xudc_write32_be(void __iomem *addr, u32 offset, u32 val)
+{
+	iowrite32be(val, addr + offset);
+}
+
+/**
+ * xudc_read32_be - big endian read from device registers
+ * @addr: addr of device register
+ * Return: value at addr
+ */
+static unsigned int xudc_read32_be(void __iomem *addr)
+{
+	return ioread32be(addr);
+}
+
+/**
+ * xudc_wrstatus - Sets up the usb device status stages.
+ * @udc: pointer to the usb device controller structure.
+ */
+static void xudc_wrstatus(struct xusb_udc *udc)
+{
+	struct xusb_ep *ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO];
+	u32 epcfgreg;
+
+	epcfgreg = udc->read_fn(udc->addr + ep0->offset)|
+				XUSB_EP_CFG_DATA_TOGGLE_MASK;
+	udc->write_fn(udc->addr, ep0->offset, epcfgreg);
+	udc->write_fn(udc->addr, ep0->offset + XUSB_EP_BUF0COUNT_OFFSET, 0);
+	udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET, 1);
+}
+
+/**
+ * xudc_epconfig - Configures the given endpoint.
+ * @ep: pointer to the usb device endpoint structure.
+ * @udc: pointer to the usb peripheral controller structure.
+ *
+ * This function configures a specific endpoint with the given configuration
+ * data.
+ */
+static void xudc_epconfig(struct xusb_ep *ep, struct xusb_udc *udc)
+{
+	u32 epcfgreg;
+
+	/*
+	 * Configure the end point direction, type, Max Packet Size and the
+	 * EP buffer location.
+	 */
+	epcfgreg = ((ep->is_in << 29) | (ep->is_iso << 28) |
+		   (ep->ep_usb.maxpacket << 15) | (ep->rambase));
+	udc->write_fn(udc->addr, ep->offset, epcfgreg);
+
+	/* Set the Buffer count and the Buffer ready bits.*/
+	udc->write_fn(udc->addr, ep->offset + XUSB_EP_BUF0COUNT_OFFSET,
+		      ep->buffer0count);
+	udc->write_fn(udc->addr, ep->offset + XUSB_EP_BUF1COUNT_OFFSET,
+		      ep->buffer1count);
+	if (ep->buffer0ready)
+		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
+			      1 << ep->epnumber);
+	if (ep->buffer1ready)
+		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
+			      1 << (ep->epnumber + XUSB_STATUS_EP_BUFF2_SHIFT));
+}
+
+/**
+ * xudc_start_dma - Starts DMA transfer.
+ * @ep: pointer to the usb device endpoint structure.
+ * @src: DMA source address.
+ * @dst: DMA destination address.
+ * @length: number of bytes to transfer.
+ *
+ * Return: 0 on success, error code on failure
+ *
+ * This function starts DMA transfer by writing to DMA source,
+ * destination and lenth registers.
+ */
+static int xudc_start_dma(struct xusb_ep *ep, dma_addr_t src,
+			  dma_addr_t dst, u32 length)
+{
+	struct xusb_udc *udc = ep->udc;
+	int rc = 0;
+	u32 timeout = 500;
+	u32 reg;
+
+	/*
+	 * Set the addresses in the DMA source and
+	 * destination registers and then set the length
+	 * into the DMA length register.
+	 */
+	udc->write_fn(udc->addr, XUSB_DMA_DSAR_ADDR_OFFSET, src);
+	udc->write_fn(udc->addr, XUSB_DMA_DDAR_ADDR_OFFSET, dst);
+	udc->write_fn(udc->addr, XUSB_DMA_LENGTH_OFFSET, length);
+
+	/*
+	 * Wait till DMA transaction is complete and
+	 * check whether the DMA transaction was
+	 * successful.
+	 */
+	do {
+		reg = udc->read_fn(udc->addr + XUSB_DMA_STATUS_OFFSET);
+		if (!(reg &  XUSB_DMA_DMASR_BUSY))
+			break;
+
+		/*
+		 * We can't sleep here, because it's also called from
+		 * interrupt context.
+		 */
+		timeout--;
+		if (!timeout) {
+			dev_err(udc->dev, "DMA timeout\n");
+			return -ETIMEDOUT;
+		}
+		udelay(1);
+	} while (1);
+
+	if ((udc->read_fn(udc->addr + XUSB_DMA_STATUS_OFFSET) &
+			  XUSB_DMA_DMASR_ERROR) == XUSB_DMA_DMASR_ERROR){
+		dev_err(udc->dev, "DMA Error\n");
+		rc = -EINVAL;
+	}
+
+	return rc;
+}
+
+/**
+ * xudc_dma_send - Sends IN data using DMA.
+ * @ep: pointer to the usb device endpoint structure.
+ * @req: pointer to the usb request structure.
+ * @buffer: pointer to data to be sent.
+ * @length: number of bytes to send.
+ *
+ * Return: 0 on success, -EAGAIN if no buffer is free and error
+ *	   code on failure.
+ *
+ * This function sends data using DMA.
+ */
+static int xudc_dma_send(struct xusb_ep *ep, struct xusb_req *req,
+			 u8 *buffer, u32 length)
+{
+	u32 *eprambase;
+	dma_addr_t src;
+	dma_addr_t dst;
+	struct xusb_udc *udc = ep->udc;
+
+	src = req->usb_req.dma + req->usb_req.actual;
+	if (req->usb_req.length)
+		dma_sync_single_for_device(udc->dev, src,
+					   length, DMA_TO_DEVICE);
+	if (!ep->curbufnum && !ep->buffer0ready) {
+		/* Get the Buffer address and copy the transmit data.*/
+		eprambase = (u32 __force *)(udc->addr + ep->rambase);
+		dst = virt_to_phys(eprambase);
+		udc->write_fn(udc->addr, ep->offset +
+			      XUSB_EP_BUF0COUNT_OFFSET, length);
+		udc->write_fn(udc->addr, XUSB_DMA_CONTROL_OFFSET,
+			      XUSB_DMA_BRR_CTRL | (1 << ep->epnumber));
+		ep->buffer0ready = 1;
+		ep->curbufnum = 1;
+	} else if (ep->curbufnum && !ep->buffer1ready) {
+		/* Get the Buffer address and copy the transmit data.*/
+		eprambase = (u32 __force *)(udc->addr + ep->rambase +
+			     ep->ep_usb.maxpacket);
+		dst = virt_to_phys(eprambase);
+		udc->write_fn(udc->addr, ep->offset +
+			      XUSB_EP_BUF1COUNT_OFFSET, length);
+		udc->write_fn(udc->addr, XUSB_DMA_CONTROL_OFFSET,
+			      XUSB_DMA_BRR_CTRL | (1 << (ep->epnumber +
+			      XUSB_STATUS_EP_BUFF2_SHIFT)));
+		ep->buffer1ready = 1;
+		ep->curbufnum = 0;
+	} else {
+		/* None of ping pong buffers are ready currently .*/
+		return -EAGAIN;
+	}
+
+	return xudc_start_dma(ep, src, dst, length);
+}
+
+/**
+ * xudc_dma_receive - Receives OUT data using DMA.
+ * @ep: pointer to the usb device endpoint structure.
+ * @req: pointer to the usb request structure.
+ * @buffer: pointer to storage buffer of received data.
+ * @length: number of bytes to receive.
+ *
+ * Return: 0 on success, -EAGAIN if no buffer is free and error
+ *	   code on failure.
+ *
+ * This function receives data using DMA.
+ */
+static int xudc_dma_receive(struct xusb_ep *ep, struct xusb_req *req,
+			    u8 *buffer, u32 length)
+{
+	u32 *eprambase;
+	dma_addr_t src;
+	dma_addr_t dst;
+	struct xusb_udc *udc = ep->udc;
+
+	dst = req->usb_req.dma + req->usb_req.actual;
+	if (!ep->curbufnum && !ep->buffer0ready) {
+		/* Get the Buffer address and copy the transmit data */
+		eprambase = (u32 __force *)(udc->addr + ep->rambase);
+		src = virt_to_phys(eprambase);
+		udc->write_fn(udc->addr, XUSB_DMA_CONTROL_OFFSET,
+			      XUSB_DMA_BRR_CTRL | XUSB_DMA_READ_FROM_DPRAM |
+			      (1 << ep->epnumber));
+		ep->buffer0ready = 1;
+		ep->curbufnum = 1;
+	} else if (ep->curbufnum && !ep->buffer1ready) {
+		/* Get the Buffer address and copy the transmit data */
+		eprambase = (u32 __force *)(udc->addr +
+			     ep->rambase + ep->ep_usb.maxpacket);
+		src = virt_to_phys(eprambase);
+		udc->write_fn(udc->addr, XUSB_DMA_CONTROL_OFFSET,
+			      XUSB_DMA_BRR_CTRL | XUSB_DMA_READ_FROM_DPRAM |
+			      (1 << (ep->epnumber +
+			      XUSB_STATUS_EP_BUFF2_SHIFT)));
+		ep->buffer1ready = 1;
+		ep->curbufnum = 0;
+	} else {
+		/* None of the ping-pong buffers are ready currently */
+		return -EAGAIN;
+	}
+
+	return xudc_start_dma(ep, src, dst, length);
+}
+
+/**
+ * xudc_eptxrx - Transmits or receives data to or from an endpoint.
+ * @ep: pointer to the usb endpoint configuration structure.
+ * @req: pointer to the usb request structure.
+ * @bufferptr: pointer to buffer containing the data to be sent.
+ * @bufferlen: The number of data bytes to be sent.
+ *
+ * Return: 0 on success, -EAGAIN if no buffer is free.
+ *
+ * This function copies the transmit/receive data to/from the end point buffer
+ * and enables the buffer for transmission/reception.
+ */
+static int xudc_eptxrx(struct xusb_ep *ep, struct xusb_req *req,
+		       u8 *bufferptr, u32 bufferlen)
+{
+	u32 *eprambase;
+	u32 bytestosend;
+	int rc = 0;
+	struct xusb_udc *udc = ep->udc;
+
+	bytestosend = bufferlen;
+	if (udc->dma_enabled) {
+		if (ep->is_in)
+			rc = xudc_dma_send(ep, req, bufferptr, bufferlen);
+		else
+			rc = xudc_dma_receive(ep, req, bufferptr, bufferlen);
+		return rc;
+	}
+	/* Put the transmit buffer into the correct ping-pong buffer.*/
+	if (!ep->curbufnum && !ep->buffer0ready) {
+		/* Get the Buffer address and copy the transmit data.*/
+		eprambase = (u32 __force *)(udc->addr + ep->rambase);
+		if (ep->is_in) {
+			memcpy(eprambase, bufferptr, bytestosend);
+			udc->write_fn(udc->addr, ep->offset +
+				      XUSB_EP_BUF0COUNT_OFFSET, bufferlen);
+		} else {
+			memcpy(bufferptr, eprambase, bytestosend);
+		}
+		/*
+		 * Enable the buffer for transmission.
+		 */
+		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
+			      1 << ep->epnumber);
+		ep->buffer0ready = 1;
+		ep->curbufnum = 1;
+	} else if (ep->curbufnum && !ep->buffer1ready) {
+		/* Get the Buffer address and copy the transmit data.*/
+		eprambase = (u32 __force *)(udc->addr + ep->rambase +
+			     ep->ep_usb.maxpacket);
+		if (ep->is_in) {
+			memcpy(eprambase, bufferptr, bytestosend);
+			udc->write_fn(udc->addr, ep->offset +
+				      XUSB_EP_BUF1COUNT_OFFSET, bufferlen);
+		} else {
+			memcpy(bufferptr, eprambase, bytestosend);
+		}
+		/*
+		 * Enable the buffer for transmission.
+		 */
+		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
+			      1 << (ep->epnumber + XUSB_STATUS_EP_BUFF2_SHIFT));
+		ep->buffer1ready = 1;
+		ep->curbufnum = 0;
+	} else {
+		/* None of the ping-pong buffers are ready currently */
+		return -EAGAIN;
+	}
+	return rc;
+}
+
+/**
+ * xudc_done - Exeutes the endpoint data transfer completion tasks.
+ * @ep: pointer to the usb device endpoint structure.
+ * @req: pointer to the usb request structure.
+ * @status: Status of the data transfer.
+ *
+ * Deletes the message from the queue and updates data transfer completion
+ * status.
+ */
+static void xudc_done(struct xusb_ep *ep, struct xusb_req *req, int status)
+{
+	struct xusb_udc *udc = ep->udc;
+
+	list_del_init(&req->queue);
+
+	if (req->usb_req.status == -EINPROGRESS)
+		req->usb_req.status = status;
+	else
+		status = req->usb_req.status;
+
+	if (status && status != -ESHUTDOWN)
+		dev_dbg(udc->dev, "%s done %p, status %d\n",
+			ep->ep_usb.name, req, status);
+	/* unmap request if DMA is present*/
+	if (udc->dma_enabled && ep->epnumber && req->usb_req.length)
+		usb_gadget_unmap_request(&udc->gadget, &req->usb_req,
+					 ep->is_in);
+
+	if (req->usb_req.complete) {
+		spin_unlock(&udc->lock);
+		req->usb_req.complete(&ep->ep_usb, &req->usb_req);
+		spin_lock(&udc->lock);
+	}
+}
+
+/**
+ * xudc_read_fifo - Reads the data from the given endpoint buffer.
+ * @ep: pointer to the usb device endpoint structure.
+ * @req: pointer to the usb request structure.
+ *
+ * Return: 0 if request is completed and -EAGAIN if not completed.
+ *
+ * Pulls OUT packet data from the endpoint buffer.
+ */
+static int xudc_read_fifo(struct xusb_ep *ep, struct xusb_req *req)
+{
+	u8 *buf;
+	u32 is_short, count, bufferspace;
+	u8 bufoffset;
+	u8 two_pkts = 0;
+	int ret;
+	int retval = -EAGAIN;
+	struct xusb_udc *udc = ep->udc;
+
+	if (ep->buffer0ready && ep->buffer1ready) {
+		dev_dbg(udc->dev, "Packet NOT ready!\n");
+		return retval;
+	}
+top:
+	if (ep->curbufnum)
+		bufoffset = XUSB_EP_BUF1COUNT_OFFSET;
+	else
+		bufoffset = XUSB_EP_BUF0COUNT_OFFSET;
+
+	count = udc->read_fn(udc->addr + ep->offset + bufoffset);
+
+	if (!ep->buffer0ready && !ep->buffer1ready)
+		two_pkts = 1;
+
+	buf = req->usb_req.buf + req->usb_req.actual;
+	prefetchw(buf);
+	bufferspace = req->usb_req.length - req->usb_req.actual;
+	is_short = count < ep->ep_usb.maxpacket;
+
+	if (unlikely(!bufferspace)) {
+		/*
+		 * This happens when the driver's buffer
+		 * is smaller than what the host sent.
+		 * discard the extra data.
+		 */
+		if (req->usb_req.status != -EOVERFLOW)
+			dev_dbg(udc->dev, "%s overflow %d\n",
+				ep->ep_usb.name, count);
+		req->usb_req.status = -EOVERFLOW;
+		xudc_done(ep, req, -EOVERFLOW);
+		return 0;
+	}
+
+	ret = xudc_eptxrx(ep, req, buf, count);
+	switch (ret) {
+	case 0:
+		req->usb_req.actual += min(count, bufferspace);
+		dev_dbg(udc->dev, "read %s, %d bytes%s req %p %d/%d\n",
+			ep->ep_usb.name, count, is_short ? "/S" : "", req,
+			req->usb_req.actual, req->usb_req.length);
+		bufferspace -= count;
+		/* Completion */
+		if ((req->usb_req.actual == req->usb_req.length) || is_short) {
+			if (udc->dma_enabled && req->usb_req.length)
+				dma_sync_single_for_cpu(udc->dev,
+							req->usb_req.dma,
+							req->usb_req.actual,
+							DMA_FROM_DEVICE);
+			xudc_done(ep, req, 0);
+			return 0;
+		}
+		if (two_pkts) {
+			two_pkts = 0;
+			goto top;
+		}
+		break;
+	case -EAGAIN:
+		dev_dbg(udc->dev, "receive busy\n");
+		break;
+	case -EINVAL:
+	case -ETIMEDOUT:
+		/* DMA error, dequeue the request */
+		xudc_done(ep, req, -ECONNRESET);
+		retval = 0;
+		break;
+	}
+
+	return retval;
+}
+
+/**
+ * xudc_write_fifo - Writes data into the given endpoint buffer.
+ * @ep: pointer to the usb device endpoint structure.
+ * @req: pointer to the usb request structure.
+ *
+ * Return: 0 if request is completed and -EAGAIN if not completed.
+ *
+ * Loads endpoint buffer for an IN packet.
+ */
+static int xudc_write_fifo(struct xusb_ep *ep, struct xusb_req *req)
+{
+	u32 max;
+	u32 length;
+	int ret;
+	int retval = -EAGAIN;
+	struct xusb_udc *udc = ep->udc;
+	int is_last, is_short = 0;
+	u8 *buf;
+
+	max = le16_to_cpu(ep->desc->wMaxPacketSize);
+	buf = req->usb_req.buf + req->usb_req.actual;
+	prefetch(buf);
+	length = req->usb_req.length - req->usb_req.actual;
+	length = min(length, max);
+
+	ret = xudc_eptxrx(ep, req, buf, length);
+	switch (ret) {
+	case 0:
+		req->usb_req.actual += length;
+		if (unlikely(length != max)) {
+			is_last = is_short = 1;
+		} else {
+			if (likely(req->usb_req.length !=
+				   req->usb_req.actual) || req->usb_req.zero)
+				is_last = 0;
+			else
+				is_last = 1;
+		}
+		dev_dbg(udc->dev, "%s: wrote %s %d bytes%s%s %d left %p\n",
+			__func__, ep->ep_usb.name, length, is_last ? "/L" : "",
+			is_short ? "/S" : "",
+			req->usb_req.length - req->usb_req.actual, req);
+		/* completion */
+		if (is_last) {
+			xudc_done(ep, req, 0);
+			retval = 0;
+		}
+		break;
+	case -EAGAIN:
+		dev_dbg(udc->dev, "Send busy\n");
+		break;
+	case -EINVAL:
+	case -ETIMEDOUT:
+		/* DMA error, dequeue the request */
+		xudc_done(ep, req, -ECONNRESET);
+		retval = 0;
+		break;
+	}
+
+	return retval;
+}
+
+/**
+ * xudc_nuke - Cleans up the data transfer message list.
+ * @ep: pointer to the usb device endpoint structure.
+ * @status: Status of the data transfer.
+ */
+static void xudc_nuke(struct xusb_ep *ep, int status)
+{
+	struct xusb_req *req;
+
+	while (!list_empty(&ep->queue)) {
+		req = list_first_entry(&ep->queue, struct xusb_req, queue);
+		xudc_done(ep, req, status);
+	}
+}
+
+/**
+ * xudc_ep_set_halt - Stalls/unstalls the given endpoint.
+ * @_ep: pointer to the usb device endpoint structure.
+ * @value: value to indicate stall/unstall.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int xudc_ep_set_halt(struct usb_ep *_ep, int value)
+{
+	struct xusb_ep *ep = to_xusb_ep(_ep);
+	struct xusb_udc *udc;
+	unsigned long flags;
+	u32 epcfgreg;
+
+	if (!_ep || (!ep->desc && ep->epnumber)) {
+		pr_debug("%s: bad ep or descriptor\n", __func__);
+		return -EINVAL;
+	}
+	udc = ep->udc;
+
+	if (ep->is_in && (!list_empty(&ep->queue)) && value) {
+		dev_dbg(udc->dev, "requests pending can't halt\n");
+		return -EAGAIN;
+	}
+
+	if (ep->buffer0ready || ep->buffer1ready) {
+		dev_dbg(udc->dev, "HW buffers busy can't halt\n");
+		return -EAGAIN;
+	}
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	if (value) {
+		/* Stall the device.*/
+		epcfgreg = udc->read_fn(udc->addr + ep->offset);
+		epcfgreg |= XUSB_EP_CFG_STALL_MASK;
+		udc->write_fn(udc->addr, ep->offset, epcfgreg);
+	} else {
+		/* Unstall the device.*/
+		epcfgreg = udc->read_fn(udc->addr + ep->offset);
+		epcfgreg &= ~XUSB_EP_CFG_STALL_MASK;
+		udc->write_fn(udc->addr, ep->offset, epcfgreg);
+		if (ep->epnumber) {
+			/* Reset the toggle bit.*/
+			epcfgreg = udc->read_fn(ep->udc->addr + ep->offset);
+			epcfgreg &= ~XUSB_EP_CFG_DATA_TOGGLE_MASK;
+			udc->write_fn(udc->addr, ep->offset, epcfgreg);
+		}
+	}
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return 0;
+}
+
+/**
+ * xudc_ep_enable - Enables the given endpoint.
+ * @ep: pointer to the xusb endpoint structure.
+ * @desc: pointer to usb endpoint descriptor.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int __xudc_ep_enable(struct xusb_ep *ep,
+			    const struct usb_endpoint_descriptor *desc)
+{
+	struct xusb_udc *udc = ep->udc;
+	u32 tmp;
+	u32 epcfg;
+	u32 ier;
+	u16 maxpacket;
+
+	ep->is_in = ((desc->bEndpointAddress & USB_DIR_IN) != 0);
+	/* Bit 3...0:endpoint number */
+	ep->epnumber = (desc->bEndpointAddress & 0x0f);
+	ep->desc = desc;
+	ep->ep_usb.desc = desc;
+	tmp = desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
+	ep->ep_usb.maxpacket = maxpacket = le16_to_cpu(desc->wMaxPacketSize);
+
+	switch (tmp) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		dev_dbg(udc->dev, "only one control endpoint\n");
+		/* NON- ISO */
+		ep->is_iso = 0;
+		return -EINVAL;
+	case USB_ENDPOINT_XFER_INT:
+		/* NON- ISO */
+		ep->is_iso = 0;
+		if (maxpacket > 64) {
+			dev_dbg(udc->dev, "bogus maxpacket %d\n", maxpacket);
+			return -EINVAL;
+		}
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+		/* NON- ISO */
+		ep->is_iso = 0;
+		if (!(is_power_of_2(maxpacket) && maxpacket >= 8 &&
+				maxpacket <= 512)) {
+			dev_dbg(udc->dev, "bogus maxpacket %d\n", maxpacket);
+			return -EINVAL;
+		}
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		/* ISO */
+		ep->is_iso = 1;
+		break;
+	}
+
+	ep->buffer0ready = 0;
+	ep->buffer1ready = 0;
+	ep->curbufnum = 0;
+	ep->rambase = rambase[ep->epnumber];
+	xudc_epconfig(ep, udc);
+
+	dev_dbg(udc->dev, "Enable Endpoint %d max pkt is %d\n",
+		ep->epnumber, maxpacket);
+
+	/* Enable the End point.*/
+	epcfg = udc->read_fn(udc->addr + ep->offset);
+	epcfg |= XUSB_EP_CFG_VALID_MASK;
+	udc->write_fn(udc->addr, ep->offset, epcfg);
+	if (ep->epnumber)
+		ep->rambase <<= 2;
+
+	/* Enable buffer completion interrupts for endpoint */
+	ier = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
+	ier |= (XUSB_STATUS_INTR_BUFF_COMP_SHIFT_MASK << ep->epnumber);
+	udc->write_fn(udc->addr, XUSB_IER_OFFSET, ier);
+
+	/* for OUT endpoint set buffers ready to receive */
+	if (ep->epnumber && !ep->is_in) {
+		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
+			      1 << ep->epnumber);
+		ep->buffer0ready = 1;
+		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
+			     (1 << (ep->epnumber +
+			      XUSB_STATUS_EP_BUFF2_SHIFT)));
+		ep->buffer1ready = 1;
+	}
+
+	return 0;
+}
+
+/**
+ * xudc_ep_enable - Enables the given endpoint.
+ * @_ep: pointer to the usb endpoint structure.
+ * @desc: pointer to usb endpoint descriptor.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int xudc_ep_enable(struct usb_ep *_ep,
+			  const struct usb_endpoint_descriptor *desc)
+{
+	struct xusb_ep *ep;
+	struct xusb_udc *udc;
+	unsigned long flags;
+	int ret;
+
+	if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
+		pr_debug("%s: bad ep or descriptor\n", __func__);
+		return -EINVAL;
+	}
+
+	ep = to_xusb_ep(_ep);
+	udc = ep->udc;
+
+	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
+		dev_dbg(udc->dev, "bogus device state\n");
+		return -ESHUTDOWN;
+	}
+
+	spin_lock_irqsave(&udc->lock, flags);
+	ret = __xudc_ep_enable(ep, desc);
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return ret;
+}
+
+/**
+ * xudc_ep_disable - Disables the given endpoint.
+ * @_ep: pointer to the usb endpoint structure.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int xudc_ep_disable(struct usb_ep *_ep)
+{
+	struct xusb_ep *ep;
+	unsigned long flags;
+	u32 epcfg;
+	struct xusb_udc *udc;
+
+	if (!_ep) {
+		pr_debug("%s: invalid ep\n", __func__);
+		return -EINVAL;
+	}
+
+	ep = to_xusb_ep(_ep);
+	udc = ep->udc;
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	xudc_nuke(ep, -ESHUTDOWN);
+
+	/* Restore the endpoint's pristine config */
+	ep->desc = NULL;
+	ep->ep_usb.desc = NULL;
+
+	dev_dbg(udc->dev, "USB Ep %d disable\n ", ep->epnumber);
+	/* Disable the endpoint.*/
+	epcfg = udc->read_fn(udc->addr + ep->offset);
+	epcfg &= ~XUSB_EP_CFG_VALID_MASK;
+	udc->write_fn(udc->addr, ep->offset, epcfg);
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return 0;
+}
+
+/**
+ * xudc_ep_alloc_request - Initializes the request queue.
+ * @_ep: pointer to the usb endpoint structure.
+ * @gfp_flags: Flags related to the request call.
+ *
+ * Return: pointer to request structure on success and a NULL on failure.
+ */
+static struct usb_request *xudc_ep_alloc_request(struct usb_ep *_ep,
+						 gfp_t gfp_flags)
+{
+	struct xusb_ep *ep = to_xusb_ep(_ep);
+	struct xusb_udc *udc;
+	struct xusb_req *req;
+
+	udc = ep->udc;
+	req = kzalloc(sizeof(*req), gfp_flags);
+	if (!req) {
+		dev_err(udc->dev, "%s:not enough memory", __func__);
+		return NULL;
+	}
+
+	req->ep = ep;
+	INIT_LIST_HEAD(&req->queue);
+	return &req->usb_req;
+}
+
+/**
+ * xudc_free_request - Releases the request from queue.
+ * @_ep: pointer to the usb device endpoint structure.
+ * @_req: pointer to the usb request structure.
+ */
+static void xudc_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct xusb_req *req = to_xusb_req(_req);
+
+	kfree(req);
+}
+
+/**
+ * xudc_ep0_queue - Adds the request to endpoint 0 queue.
+ * @ep0: pointer to the xusb endpoint 0 structure.
+ * @req: pointer to the xusb request structure.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int __xudc_ep0_queue(struct xusb_ep *ep0, struct xusb_req *req)
+{
+	struct xusb_udc *udc = ep0->udc;
+	u32 length;
+	u8 *corebuf;
+
+	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
+		dev_dbg(udc->dev, "%s, bogus device state\n", __func__);
+		return -EINVAL;
+	}
+	if (!list_empty(&ep0->queue)) {
+		dev_dbg(udc->dev, "%s:ep0 busy\n", __func__);
+		return -EBUSY;
+	}
+
+	req->usb_req.status = -EINPROGRESS;
+	req->usb_req.actual = 0;
+
+	list_add_tail(&req->queue, &ep0->queue);
+
+	if (udc->setup.bRequestType & USB_DIR_IN) {
+		prefetch(req->usb_req.buf);
+		length = req->usb_req.length;
+		corebuf = (void __force *) ((ep0->rambase << 2) +
+			   udc->addr);
+		length = req->usb_req.actual = min_t(u32, length,
+						     EP0_MAX_PACKET);
+		memcpy(corebuf, req->usb_req.buf, length);
+		udc->write_fn(udc->addr, XUSB_EP_BUF0COUNT_OFFSET, length);
+		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET, 1);
+	} else {
+		if (udc->setup.wLength) {
+			/* Enable EP0 buffer to receive data */
+			udc->write_fn(udc->addr, XUSB_EP_BUF0COUNT_OFFSET, 0);
+			udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET, 1);
+		} else {
+			xudc_wrstatus(udc);
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * xudc_ep0_queue - Adds the request to endpoint 0 queue.
+ * @_ep: pointer to the usb endpoint 0 structure.
+ * @_req: pointer to the usb request structure.
+ * @gfp_flags: Flags related to the request call.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int xudc_ep0_queue(struct usb_ep *_ep, struct usb_request *_req,
+			  gfp_t gfp_flags)
+{
+	struct xusb_req *req	= to_xusb_req(_req);
+	struct xusb_ep	*ep0	= to_xusb_ep(_ep);
+	struct xusb_udc *udc	= ep0->udc;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&udc->lock, flags);
+	ret = __xudc_ep0_queue(ep0, req);
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return ret;
+}
+
+/**
+ * xudc_ep_queue - Adds the request to endpoint queue.
+ * @_ep: pointer to the usb endpoint structure.
+ * @_req: pointer to the usb request structure.
+ * @gfp_flags: Flags related to the request call.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int xudc_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
+			 gfp_t gfp_flags)
+{
+	struct xusb_req *req = to_xusb_req(_req);
+	struct xusb_ep	*ep  = to_xusb_ep(_ep);
+	struct xusb_udc *udc = ep->udc;
+	int  ret;
+	unsigned long flags;
+
+	if (!ep->desc) {
+		dev_dbg(udc->dev, "%s:queing request to disabled %s\n",
+			__func__, ep->name);
+		return -ESHUTDOWN;
+	}
+
+	if (!udc->driver || udc->gadget.speed == USB_SPEED_UNKNOWN) {
+		dev_dbg(udc->dev, "%s, bogus device state\n", __func__);
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	_req->status = -EINPROGRESS;
+	_req->actual = 0;
+
+	if (udc->dma_enabled) {
+		ret = usb_gadget_map_request(&udc->gadget, &req->usb_req,
+					     ep->is_in);
+		if (ret) {
+			dev_dbg(udc->dev, "gadget_map failed ep%d\n",
+				ep->epnumber);
+			spin_unlock_irqrestore(&udc->lock, flags);
+			return -EAGAIN;
+		}
+	}
+
+	if (list_empty(&ep->queue)) {
+		if (ep->is_in) {
+			dev_dbg(udc->dev, "xudc_write_fifo from ep_queue\n");
+			if (!xudc_write_fifo(ep, req))
+				req = NULL;
+		} else {
+			dev_dbg(udc->dev, "xudc_read_fifo from ep_queue\n");
+			if (!xudc_read_fifo(ep, req))
+				req = NULL;
+		}
+	}
+
+	if (req != NULL)
+		list_add_tail(&req->queue, &ep->queue);
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return 0;
+}
+
+/**
+ * xudc_ep_dequeue - Removes the request from the queue.
+ * @_ep: pointer to the usb device endpoint structure.
+ * @_req: pointer to the usb request structure.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int xudc_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct xusb_ep *ep	= to_xusb_ep(_ep);
+	struct xusb_req *req	= to_xusb_req(_req);
+	struct xusb_udc *udc	= ep->udc;
+	unsigned long flags;
+
+	spin_lock_irqsave(&udc->lock, flags);
+	/* Make sure it's actually queued on this endpoint */
+	list_for_each_entry(req, &ep->queue, queue) {
+		if (&req->usb_req == _req)
+			break;
+	}
+	if (&req->usb_req != _req) {
+		spin_unlock_irqrestore(&ep->udc->lock, flags);
+		return -EINVAL;
+	}
+	xudc_done(ep, req, -ECONNRESET);
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+/**
+ * xudc_ep0_enable - Enables the given endpoint.
+ * @ep: pointer to the usb endpoint structure.
+ * @desc: pointer to usb endpoint descriptor.
+ *
+ * Return: error always.
+ *
+ * endpoint 0 enable should not be called by gadget layer.
+ */
+static int xudc_ep0_enable(struct usb_ep *ep,
+			   const struct usb_endpoint_descriptor *desc)
+{
+	return -EINVAL;
+}
+
+/**
+ * xudc_ep0_disable - Disables the given endpoint.
+ * @ep: pointer to the usb endpoint structure.
+ *
+ * Return: error always.
+ *
+ * endpoint 0 disable should not be called by gadget layer.
+ */
+static int xudc_ep0_disable(struct usb_ep *ep)
+{
+	return -EINVAL;
+}
+
+static const struct usb_ep_ops xusb_ep0_ops = {
+	.enable		= xudc_ep0_enable,
+	.disable	= xudc_ep0_disable,
+	.alloc_request	= xudc_ep_alloc_request,
+	.free_request	= xudc_free_request,
+	.queue		= xudc_ep0_queue,
+	.dequeue	= xudc_ep_dequeue,
+	.set_halt	= xudc_ep_set_halt,
+};
+
+static const struct usb_ep_ops xusb_ep_ops = {
+	.enable		= xudc_ep_enable,
+	.disable	= xudc_ep_disable,
+	.alloc_request	= xudc_ep_alloc_request,
+	.free_request	= xudc_free_request,
+	.queue		= xudc_ep_queue,
+	.dequeue	= xudc_ep_dequeue,
+	.set_halt	= xudc_ep_set_halt,
+};
+
+/**
+ * xudc_get_frame - Reads the current usb frame number.
+ * @gadget: pointer to the usb gadget structure.
+ *
+ * Return: current frame number for success and error value on failure.
+ */
+static int xudc_get_frame(struct usb_gadget *gadget)
+{
+	struct xusb_udc *udc;
+	int frame;
+
+	if (!gadget)
+		return -ENODEV;
+
+	udc = to_udc(gadget);
+	frame = udc->read_fn(udc->addr + XUSB_FRAMENUM_OFFSET);
+	return frame;
+}
+
+/**
+ * xudc_wakeup - Send remote wakeup signal to host
+ * @gadget: pointer to the usb gadget structure.
+ *
+ * Return: 0 on success and error on failure
+ */
+static int xudc_wakeup(struct usb_gadget *gadget)
+{
+	struct xusb_udc *udc = to_udc(gadget);
+	u32 crtlreg;
+	int status = -EINVAL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	/* Remote wake up not enabled by host */
+	if (!udc->remote_wkp)
+		goto done;
+
+	crtlreg = udc->read_fn(udc->addr + XUSB_CONTROL_OFFSET);
+	crtlreg |= XUSB_CONTROL_USB_RMTWAKE_MASK;
+	/* set remote wake up bit */
+	udc->write_fn(udc->addr, XUSB_CONTROL_OFFSET, crtlreg);
+	/*
+	 * wait for a while and reset remote wake up bit since this bit
+	 * is not cleared by HW after sending remote wakeup to host.
+	 */
+	mdelay(2);
+
+	crtlreg &= ~XUSB_CONTROL_USB_RMTWAKE_MASK;
+	udc->write_fn(udc->addr, XUSB_CONTROL_OFFSET, crtlreg);
+	status = 0;
+done:
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return status;
+}
+
+/**
+ * xudc_pullup - start/stop USB traffic
+ * @gadget: pointer to the usb gadget structure.
+ * @is_on: flag to start or stop
+ *
+ * Return: 0 always
+ *
+ * This function starts/stops SIE engine of IP based on is_on.
+ */
+static int xudc_pullup(struct usb_gadget *gadget, int is_on)
+{
+	struct xusb_udc *udc = to_udc(gadget);
+	unsigned long flags;
+	u32 crtlreg;
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	crtlreg = udc->read_fn(udc->addr + XUSB_CONTROL_OFFSET);
+	if (is_on)
+		crtlreg |= XUSB_CONTROL_USB_READY_MASK;
+	else
+		crtlreg &= ~XUSB_CONTROL_USB_READY_MASK;
+
+	udc->write_fn(udc->addr, XUSB_CONTROL_OFFSET, crtlreg);
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+/**
+ * xudc_eps_init - initialize endpoints.
+ * @udc: pointer to the usb device controller structure.
+ */
+static void xudc_eps_init(struct xusb_udc *udc)
+{
+	u32 ep_number;
+
+	INIT_LIST_HEAD(&udc->gadget.ep_list);
+
+	for (ep_number = 0; ep_number < XUSB_MAX_ENDPOINTS; ep_number++) {
+		struct xusb_ep *ep = &udc->ep[ep_number];
+
+		if (ep_number) {
+			list_add_tail(&ep->ep_usb.ep_list,
+				      &udc->gadget.ep_list);
+			usb_ep_set_maxpacket_limit(&ep->ep_usb,
+						  (unsigned short) ~0);
+			snprintf(ep->name, EPNAME_SIZE, "ep%d", ep_number);
+			ep->ep_usb.name = ep->name;
+			ep->ep_usb.ops = &xusb_ep_ops;
+		} else {
+			ep->ep_usb.name = ep0name;
+			usb_ep_set_maxpacket_limit(&ep->ep_usb, EP0_MAX_PACKET);
+			ep->ep_usb.ops = &xusb_ep0_ops;
+		}
+
+		ep->udc = udc;
+		ep->epnumber = ep_number;
+		ep->desc = NULL;
+		/*
+		 * The configuration register address offset between
+		 * each endpoint is 0x10.
+		 */
+		ep->offset = XUSB_EP0_CONFIG_OFFSET + (ep_number * 0x10);
+		ep->is_in = 0;
+		ep->is_iso = 0;
+		ep->maxpacket = 0;
+		xudc_epconfig(ep, udc);
+
+		/* Initialize one queue per endpoint */
+		INIT_LIST_HEAD(&ep->queue);
+	}
+}
+
+/**
+ * xudc_stop_activity - Stops any further activity on the device.
+ * @udc: pointer to the usb device controller structure.
+ */
+static void xudc_stop_activity(struct xusb_udc *udc)
+{
+	int i;
+	struct xusb_ep *ep;
+
+	for (i = 0; i < XUSB_MAX_ENDPOINTS; i++) {
+		ep = &udc->ep[i];
+		xudc_nuke(ep, -ESHUTDOWN);
+	}
+}
+
+/**
+ * xudc_start - Starts the device.
+ * @gadget: pointer to the usb gadget structure
+ * @driver: pointer to gadget driver structure
+ *
+ * Return: zero on success and error on failure
+ */
+static int xudc_start(struct usb_gadget *gadget,
+		      struct usb_gadget_driver *driver)
+{
+	struct xusb_udc *udc	= to_udc(gadget);
+	struct xusb_ep *ep0	= &udc->ep[XUSB_EP_NUMBER_ZERO];
+	const struct usb_endpoint_descriptor *desc = &config_bulk_out_desc;
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	if (udc->driver) {
+		dev_err(udc->dev, "%s is already bound to %s\n",
+			udc->gadget.name, udc->driver->driver.name);
+		ret = -EBUSY;
+		goto err;
+	}
+
+	/* hook up the driver */
+	udc->driver = driver;
+	udc->gadget.speed = driver->max_speed;
+
+	/* Enable the control endpoint. */
+	ret = __xudc_ep_enable(ep0, desc);
+
+	/* Set device address and remote wakeup to 0 */
+	udc->write_fn(udc->addr, XUSB_ADDRESS_OFFSET, 0);
+	udc->remote_wkp = 0;
+err:
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return ret;
+}
+
+/**
+ * xudc_stop - stops the device.
+ * @gadget: pointer to the usb gadget structure
+ * @driver: pointer to usb gadget driver structure
+ *
+ * Return: zero always
+ */
+static int xudc_stop(struct usb_gadget *gadget,
+		     struct usb_gadget_driver *driver)
+{
+	struct xusb_udc *udc = to_udc(gadget);
+	unsigned long flags;
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	udc->gadget.speed = USB_SPEED_UNKNOWN;
+	udc->driver = NULL;
+
+	/* Set device address and remote wakeup to 0 */
+	udc->write_fn(udc->addr, XUSB_ADDRESS_OFFSET, 0);
+	udc->remote_wkp = 0;
+
+	xudc_stop_activity(udc);
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+
+	return 0;
+}
+
+static const struct usb_gadget_ops xusb_udc_ops = {
+	.get_frame	= xudc_get_frame,
+	.wakeup		= xudc_wakeup,
+	.pullup		= xudc_pullup,
+	.udc_start	= xudc_start,
+	.udc_stop	= xudc_stop,
+};
+
+/**
+ * xudc_clear_stall_all_ep - clears stall of every endpoint.
+ * @udc: pointer to the udc structure.
+ */
+static void xudc_clear_stall_all_ep(struct xusb_udc *udc)
+{
+	struct xusb_ep *ep;
+	u32 epcfgreg;
+	int i;
+
+	for (i = 0; i < XUSB_MAX_ENDPOINTS; i++) {
+		ep = &udc->ep[i];
+		epcfgreg = udc->read_fn(udc->addr + ep->offset);
+		epcfgreg &= ~XUSB_EP_CFG_STALL_MASK;
+		udc->write_fn(udc->addr, ep->offset, epcfgreg);
+		if (ep->epnumber) {
+			/* Reset the toggle bit.*/
+			epcfgreg = udc->read_fn(udc->addr + ep->offset);
+			epcfgreg &= ~XUSB_EP_CFG_DATA_TOGGLE_MASK;
+			udc->write_fn(udc->addr, ep->offset, epcfgreg);
+		}
+	}
+}
+
+/**
+ * xudc_startup_handler - The usb device controller interrupt handler.
+ * @udc: pointer to the udc structure.
+ * @intrstatus: The mask value containing the interrupt sources.
+ *
+ * This function handles the RESET,SUSPEND,RESUME and DISCONNECT interrupts.
+ */
+static void xudc_startup_handler(struct xusb_udc *udc, u32 intrstatus)
+{
+	u32 intrreg;
+
+	if (intrstatus & XUSB_STATUS_RESET_MASK) {
+
+		dev_dbg(udc->dev, "Reset\n");
+
+		if (intrstatus & XUSB_STATUS_HIGH_SPEED_MASK)
+			udc->gadget.speed = USB_SPEED_HIGH;
+		else
+			udc->gadget.speed = USB_SPEED_FULL;
+
+		xudc_stop_activity(udc);
+		xudc_clear_stall_all_ep(udc);
+		udc->write_fn(udc->addr, XUSB_TESTMODE_OFFSET, 0);
+
+		/* Set device address and remote wakeup to 0 */
+		udc->write_fn(udc->addr, XUSB_ADDRESS_OFFSET, 0);
+		udc->remote_wkp = 0;
+
+		/* Enable the suspend, resume and disconnect */
+		intrreg = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
+		intrreg |= XUSB_STATUS_SUSPEND_MASK | XUSB_STATUS_RESUME_MASK |
+			   XUSB_STATUS_DISCONNECT_MASK;
+		udc->write_fn(udc->addr, XUSB_IER_OFFSET, intrreg);
+	}
+	if (intrstatus & XUSB_STATUS_SUSPEND_MASK) {
+
+		dev_dbg(udc->dev, "Suspend\n");
+
+		/* Enable the reset, resume and disconnect */
+		intrreg = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
+		intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_RESUME_MASK |
+			   XUSB_STATUS_DISCONNECT_MASK;
+		udc->write_fn(udc->addr, XUSB_IER_OFFSET, intrreg);
+
+		udc->usb_state = USB_STATE_SUSPENDED;
+
+		if (udc->driver->suspend) {
+			spin_unlock(&udc->lock);
+			udc->driver->suspend(&udc->gadget);
+			spin_lock(&udc->lock);
+		}
+	}
+	if (intrstatus & XUSB_STATUS_RESUME_MASK) {
+		bool condition = (udc->usb_state != USB_STATE_SUSPENDED);
+
+		dev_WARN_ONCE(udc->dev, condition,
+				"Resume IRQ while not suspended\n");
+
+		dev_dbg(udc->dev, "Resume\n");
+
+		/* Enable the reset, suspend and disconnect */
+		intrreg = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
+		intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_SUSPEND_MASK |
+			   XUSB_STATUS_DISCONNECT_MASK;
+		udc->write_fn(udc->addr, XUSB_IER_OFFSET, intrreg);
+
+		udc->usb_state = 0;
+
+		if (udc->driver->resume) {
+			spin_unlock(&udc->lock);
+			udc->driver->resume(&udc->gadget);
+			spin_lock(&udc->lock);
+		}
+	}
+	if (intrstatus & XUSB_STATUS_DISCONNECT_MASK) {
+
+		dev_dbg(udc->dev, "Disconnect\n");
+
+		/* Enable the reset, resume and suspend */
+		intrreg = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
+		intrreg |= XUSB_STATUS_RESET_MASK | XUSB_STATUS_RESUME_MASK |
+			   XUSB_STATUS_SUSPEND_MASK;
+		udc->write_fn(udc->addr, XUSB_IER_OFFSET, intrreg);
+
+		if (udc->driver && udc->driver->disconnect) {
+			spin_unlock(&udc->lock);
+			udc->driver->disconnect(&udc->gadget);
+			spin_lock(&udc->lock);
+		}
+	}
+}
+
+/**
+ * xudc_ep0_stall - Stall endpoint zero.
+ * @udc: pointer to the udc structure.
+ *
+ * This function stalls endpoint zero.
+ */
+static void xudc_ep0_stall(struct xusb_udc *udc)
+{
+	u32 epcfgreg;
+	struct xusb_ep *ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO];
+
+	epcfgreg = udc->read_fn(udc->addr + ep0->offset);
+	epcfgreg |= XUSB_EP_CFG_STALL_MASK;
+	udc->write_fn(udc->addr, ep0->offset, epcfgreg);
+}
+
+/**
+ * xudc_setaddress - executes SET_ADDRESS command
+ * @udc: pointer to the udc structure.
+ *
+ * This function executes USB SET_ADDRESS command
+ */
+static void xudc_setaddress(struct xusb_udc *udc)
+{
+	struct xusb_ep *ep0	= &udc->ep[0];
+	struct xusb_req *req	= udc->req;
+	int ret;
+
+	req->usb_req.length = 0;
+	ret = __xudc_ep0_queue(ep0, req);
+	if (ret == 0)
+		return;
+
+	dev_err(udc->dev, "Can't respond to SET ADDRESS request\n");
+	xudc_ep0_stall(udc);
+}
+
+/**
+ * xudc_getstatus - executes GET_STATUS command
+ * @udc: pointer to the udc structure.
+ *
+ * This function executes USB GET_STATUS command
+ */
+static void xudc_getstatus(struct xusb_udc *udc)
+{
+	struct xusb_ep *ep0	= &udc->ep[0];
+	struct xusb_req *req	= udc->req;
+	struct xusb_ep *target_ep;
+	u16 status = 0;
+	u32 epcfgreg;
+	int epnum;
+	u32 halt;
+	int ret;
+
+	switch (udc->setup.bRequestType & USB_RECIP_MASK) {
+	case USB_RECIP_DEVICE:
+		/* Get device status */
+		status = 1 << USB_DEVICE_SELF_POWERED;
+		if (udc->remote_wkp)
+			status |= (1 << USB_DEVICE_REMOTE_WAKEUP);
+		break;
+	case USB_RECIP_INTERFACE:
+		break;
+	case USB_RECIP_ENDPOINT:
+		epnum = udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK;
+		target_ep = &udc->ep[epnum];
+		epcfgreg = udc->read_fn(udc->addr + target_ep->offset);
+		halt = epcfgreg & XUSB_EP_CFG_STALL_MASK;
+		if (udc->setup.wIndex & USB_DIR_IN) {
+			if (!target_ep->is_in)
+				goto stall;
+		} else {
+			if (target_ep->is_in)
+				goto stall;
+		}
+		if (halt)
+			status = 1 << USB_ENDPOINT_HALT;
+		break;
+	default:
+		goto stall;
+	}
+
+	req->usb_req.length = 2;
+	*(u16 *)req->usb_req.buf = cpu_to_le16(status);
+	ret = __xudc_ep0_queue(ep0, req);
+	if (ret == 0)
+		return;
+stall:
+	dev_err(udc->dev, "Can't respond to getstatus request\n");
+	xudc_ep0_stall(udc);
+}
+
+/**
+ * xudc_set_clear_feature - Executes the set feature and clear feature commands.
+ * @udc: pointer to the usb device controller structure.
+ *
+ * Processes the SET_FEATURE and CLEAR_FEATURE commands.
+ */
+static void xudc_set_clear_feature(struct xusb_udc *udc)
+{
+	struct xusb_ep *ep0	= &udc->ep[0];
+	struct xusb_req *req	= udc->req;
+	struct xusb_ep *target_ep;
+	u8 endpoint;
+	u8 outinbit;
+	u32 epcfgreg;
+	int flag = (udc->setup.bRequest == USB_REQ_SET_FEATURE ? 1 : 0);
+	int ret;
+
+	switch (udc->setup.bRequestType) {
+	case USB_RECIP_DEVICE:
+		switch (udc->setup.wValue) {
+		case USB_DEVICE_TEST_MODE:
+			/*
+			 * The Test Mode will be executed
+			 * after the status phase.
+			 */
+			break;
+		case USB_DEVICE_REMOTE_WAKEUP:
+			if (flag)
+				udc->remote_wkp = 1;
+			else
+				udc->remote_wkp = 0;
+			break;
+		default:
+			xudc_ep0_stall(udc);
+			break;
+		}
+		break;
+	case USB_RECIP_ENDPOINT:
+		if (!udc->setup.wValue) {
+			endpoint = udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK;
+			target_ep = &udc->ep[endpoint];
+			outinbit = udc->setup.wIndex & USB_ENDPOINT_DIR_MASK;
+			outinbit = outinbit >> 7;
+
+			/* Make sure direction matches.*/
+			if (outinbit != target_ep->is_in) {
+				xudc_ep0_stall(udc);
+				return;
+			}
+			epcfgreg = udc->read_fn(udc->addr + target_ep->offset);
+			if (!endpoint) {
+				/* Clear the stall.*/
+				epcfgreg &= ~XUSB_EP_CFG_STALL_MASK;
+				udc->write_fn(udc->addr,
+					      target_ep->offset, epcfgreg);
+			} else {
+				if (flag) {
+					epcfgreg |= XUSB_EP_CFG_STALL_MASK;
+					udc->write_fn(udc->addr,
+						      target_ep->offset,
+						      epcfgreg);
+				} else {
+					/* Unstall the endpoint.*/
+					epcfgreg &= ~(XUSB_EP_CFG_STALL_MASK |
+						XUSB_EP_CFG_DATA_TOGGLE_MASK);
+					udc->write_fn(udc->addr,
+						      target_ep->offset,
+						      epcfgreg);
+				}
+			}
+		}
+		break;
+	default:
+		xudc_ep0_stall(udc);
+		return;
+	}
+
+	req->usb_req.length = 0;
+	ret = __xudc_ep0_queue(ep0, req);
+	if (ret == 0)
+		return;
+
+	dev_err(udc->dev, "Can't respond to SET/CLEAR FEATURE\n");
+	xudc_ep0_stall(udc);
+}
+
+/**
+ * xudc_handle_setup - Processes the setup packet.
+ * @udc: pointer to the usb device controller structure.
+ *
+ * Process setup packet and delegate to gadget layer.
+ */
+static void xudc_handle_setup(struct xusb_udc *udc)
+{
+	struct xusb_ep *ep0 = &udc->ep[0];
+	struct usb_ctrlrequest setup;
+	u32 *ep0rambase;
+
+	/* Load up the chapter 9 command buffer.*/
+	ep0rambase = (u32 __force *) (udc->addr + XUSB_SETUP_PKT_ADDR_OFFSET);
+	memcpy(&setup, ep0rambase, 8);
+
+	udc->setup = setup;
+	udc->setup.wValue = cpu_to_le16(setup.wValue);
+	udc->setup.wIndex = cpu_to_le16(setup.wIndex);
+	udc->setup.wLength = cpu_to_le16(setup.wLength);
+
+	/* Clear previous requests */
+	xudc_nuke(ep0, -ECONNRESET);
+
+	if (udc->setup.bRequestType & USB_DIR_IN) {
+		/* Execute the get command.*/
+		udc->setupseqrx = STATUS_PHASE;
+		udc->setupseqtx = DATA_PHASE;
+	} else {
+		/* Execute the put command.*/
+		udc->setupseqrx = DATA_PHASE;
+		udc->setupseqtx = STATUS_PHASE;
+	}
+
+	switch (udc->setup.bRequest) {
+	case USB_REQ_GET_STATUS:
+		/* Data+Status phase form udc */
+		if ((udc->setup.bRequestType &
+				(USB_DIR_IN | USB_TYPE_MASK)) !=
+				(USB_DIR_IN | USB_TYPE_STANDARD))
+			break;
+		xudc_getstatus(udc);
+		return;
+	case USB_REQ_SET_ADDRESS:
+		/* Status phase from udc */
+		if (udc->setup.bRequestType != (USB_DIR_OUT |
+				USB_TYPE_STANDARD | USB_RECIP_DEVICE))
+			break;
+		xudc_setaddress(udc);
+		return;
+	case USB_REQ_CLEAR_FEATURE:
+	case USB_REQ_SET_FEATURE:
+		/* Requests with no data phase, status phase from udc */
+		if ((udc->setup.bRequestType & USB_TYPE_MASK)
+				!= USB_TYPE_STANDARD)
+			break;
+		xudc_set_clear_feature(udc);
+		return;
+	default:
+		break;
+	}
+
+	spin_unlock(&udc->lock);
+	if (udc->driver->setup(&udc->gadget, &setup) < 0)
+		xudc_ep0_stall(udc);
+	spin_lock(&udc->lock);
+}
+
+/**
+ * xudc_ep0_out - Processes the endpoint 0 OUT token.
+ * @udc: pointer to the usb device controller structure.
+ */
+static void xudc_ep0_out(struct xusb_udc *udc)
+{
+	struct xusb_ep *ep0 = &udc->ep[0];
+	struct xusb_req *req;
+	u8 *ep0rambase;
+	unsigned int bytes_to_rx;
+	void *buffer;
+
+	req = list_first_entry(&ep0->queue, struct xusb_req, queue);
+
+	switch (udc->setupseqrx) {
+	case STATUS_PHASE:
+		/*
+		 * This resets both state machines for the next
+		 * Setup packet.
+		 */
+		udc->setupseqrx = SETUP_PHASE;
+		udc->setupseqtx = SETUP_PHASE;
+		req->usb_req.actual = req->usb_req.length;
+		xudc_done(ep0, req, 0);
+		break;
+	case DATA_PHASE:
+		bytes_to_rx = udc->read_fn(udc->addr +
+					   XUSB_EP_BUF0COUNT_OFFSET);
+		/* Copy the data to be received from the DPRAM. */
+		ep0rambase = (u8 __force *) (udc->addr +
+			     (ep0->rambase << 2));
+		buffer = req->usb_req.buf + req->usb_req.actual;
+		req->usb_req.actual = req->usb_req.actual + bytes_to_rx;
+		memcpy(buffer, ep0rambase, bytes_to_rx);
+
+		if (req->usb_req.length == req->usb_req.actual) {
+			/* Data transfer completed get ready for Status stage */
+			xudc_wrstatus(udc);
+		} else {
+			/* Enable EP0 buffer to receive data */
+			udc->write_fn(udc->addr, XUSB_EP_BUF0COUNT_OFFSET, 0);
+			udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET, 1);
+		}
+		break;
+	default:
+		break;
+	}
+}
+
+/**
+ * xudc_ep0_in - Processes the endpoint 0 IN token.
+ * @udc: pointer to the usb device controller structure.
+ */
+static void xudc_ep0_in(struct xusb_udc *udc)
+{
+	struct xusb_ep *ep0 = &udc->ep[0];
+	struct xusb_req *req;
+	unsigned int bytes_to_tx;
+	void *buffer;
+	u32 epcfgreg;
+	u16 count = 0;
+	u16 length;
+	u8 *ep0rambase;
+	u8 test_mode = udc->setup.wIndex >> 8;
+
+	req = list_first_entry(&ep0->queue, struct xusb_req, queue);
+	bytes_to_tx = req->usb_req.length - req->usb_req.actual;
+
+	switch (udc->setupseqtx) {
+	case STATUS_PHASE:
+		switch (udc->setup.bRequest) {
+		case USB_REQ_SET_ADDRESS:
+			/* Set the address of the device.*/
+			udc->write_fn(udc->addr, XUSB_ADDRESS_OFFSET,
+				      udc->setup.wValue);
+			break;
+		case USB_REQ_SET_FEATURE:
+			if (udc->setup.bRequestType ==
+					USB_RECIP_DEVICE) {
+				if (udc->setup.wValue ==
+						USB_DEVICE_TEST_MODE)
+					udc->write_fn(udc->addr,
+						      XUSB_TESTMODE_OFFSET,
+						      test_mode);
+			}
+			break;
+		}
+		req->usb_req.actual = req->usb_req.length;
+		xudc_done(ep0, req, 0);
+		break;
+	case DATA_PHASE:
+		if (!bytes_to_tx) {
+			/*
+			 * We're done with data transfer, next
+			 * will be zero length OUT with data toggle of
+			 * 1. Setup data_toggle.
+			 */
+			epcfgreg = udc->read_fn(udc->addr + ep0->offset);
+			epcfgreg |= XUSB_EP_CFG_DATA_TOGGLE_MASK;
+			udc->write_fn(udc->addr, ep0->offset, epcfgreg);
+			udc->setupseqtx = STATUS_PHASE;
+		} else {
+			length = count = min_t(u32, bytes_to_tx,
+					       EP0_MAX_PACKET);
+			/* Copy the data to be transmitted into the DPRAM. */
+			ep0rambase = (u8 __force *) (udc->addr +
+				     (ep0->rambase << 2));
+			buffer = req->usb_req.buf + req->usb_req.actual;
+			req->usb_req.actual = req->usb_req.actual + length;
+			memcpy(ep0rambase, buffer, length);
+		}
+		udc->write_fn(udc->addr, XUSB_EP_BUF0COUNT_OFFSET, count);
+		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET, 1);
+		break;
+	default:
+		break;
+	}
+}
+
+/**
+ * xudc_ctrl_ep_handler - Endpoint 0 interrupt handler.
+ * @udc: pointer to the udc structure.
+ * @intrstatus:	It's the mask value for the interrupt sources on endpoint 0.
+ *
+ * Processes the commands received during enumeration phase.
+ */
+static void xudc_ctrl_ep_handler(struct xusb_udc *udc, u32 intrstatus)
+{
+
+	if (intrstatus & XUSB_STATUS_SETUP_PACKET_MASK) {
+		xudc_handle_setup(udc);
+	} else {
+		if (intrstatus & XUSB_STATUS_FIFO_BUFF_RDY_MASK)
+			xudc_ep0_out(udc);
+		else if (intrstatus & XUSB_STATUS_FIFO_BUFF_FREE_MASK)
+			xudc_ep0_in(udc);
+	}
+}
+
+/**
+ * xudc_nonctrl_ep_handler - Non control endpoint interrupt handler.
+ * @udc: pointer to the udc structure.
+ * @epnum: End point number for which the interrupt is to be processed
+ * @intrstatus:	mask value for interrupt sources of endpoints other
+ *		than endpoint 0.
+ *
+ * Processes the buffer completion interrupts.
+ */
+static void xudc_nonctrl_ep_handler(struct xusb_udc *udc, u8 epnum,
+				    u32 intrstatus)
+{
+
+	struct xusb_req *req;
+	struct xusb_ep *ep;
+
+	ep = &udc->ep[epnum];
+	/* Process the End point interrupts.*/
+	if (intrstatus & (XUSB_STATUS_EP0_BUFF1_COMP_MASK << epnum))
+		ep->buffer0ready = 0;
+	if (intrstatus & (XUSB_STATUS_EP0_BUFF2_COMP_MASK << epnum))
+		ep->buffer1ready = 0;
+
+	if (list_empty(&ep->queue))
+		return;
+
+	req = list_first_entry(&ep->queue, struct xusb_req, queue);
+
+	if (ep->is_in)
+		xudc_write_fifo(ep, req);
+	else
+		xudc_read_fifo(ep, req);
+}
+
+/**
+ * xudc_irq - The main interrupt handler.
+ * @irq: The interrupt number.
+ * @_udc: pointer to the usb device controller structure.
+ *
+ * Return: IRQ_HANDLED after the interrupt is handled.
+ */
+static irqreturn_t xudc_irq(int irq, void *_udc)
+{
+	struct xusb_udc *udc = _udc;
+	u32 intrstatus;
+	u32 ier;
+	u8 index;
+	u32 bufintr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&udc->lock, flags);
+
+	/*
+	 * Event interrupts are level sensitive hence first disable
+	 * IER, read ISR and figure out active interrupts.
+	 */
+	ier = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
+	ier &= ~XUSB_STATUS_INTR_EVENT_MASK;
+	udc->write_fn(udc->addr, XUSB_IER_OFFSET, ier);
+
+	/* Read the Interrupt Status Register.*/
+	intrstatus = udc->read_fn(udc->addr + XUSB_STATUS_OFFSET);
+
+	/* Call the handler for the event interrupt.*/
+	if (intrstatus & XUSB_STATUS_INTR_EVENT_MASK) {
+		/*
+		 * Check if there is any action to be done for :
+		 * - USB Reset received {XUSB_STATUS_RESET_MASK}
+		 * - USB Suspend received {XUSB_STATUS_SUSPEND_MASK}
+		 * - USB Resume received {XUSB_STATUS_RESUME_MASK}
+		 * - USB Disconnect received {XUSB_STATUS_DISCONNECT_MASK}
+		 */
+		xudc_startup_handler(udc, intrstatus);
+	}
+
+	/* Check the buffer completion interrupts */
+	if (intrstatus & XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK) {
+		/* Enable Reset, Suspend, Resume and Disconnect  */
+		ier = udc->read_fn(udc->addr + XUSB_IER_OFFSET);
+		ier |= XUSB_STATUS_INTR_EVENT_MASK;
+		udc->write_fn(udc->addr, XUSB_IER_OFFSET, ier);
+
+		if (intrstatus & XUSB_STATUS_EP0_BUFF1_COMP_MASK)
+			xudc_ctrl_ep_handler(udc, intrstatus);
+
+		for (index = 1; index < 8; index++) {
+			bufintr = ((intrstatus &
+				  (XUSB_STATUS_EP1_BUFF1_COMP_MASK <<
+				  (index - 1))) || (intrstatus &
+				  (XUSB_STATUS_EP1_BUFF2_COMP_MASK <<
+				  (index - 1))));
+			if (bufintr) {
+				xudc_nonctrl_ep_handler(udc, index,
+							intrstatus);
+			}
+		}
+	}
+
+	spin_unlock_irqrestore(&udc->lock, flags);
+	return IRQ_HANDLED;
+}
+
+/**
+ * xudc_probe - The device probe function for driver initialization.
+ * @pdev: pointer to the platform device structure.
+ *
+ * Return: 0 for success and error value on failure
+ */
+static int xudc_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *res;
+	struct xusb_udc *udc;
+	struct xusb_ep *ep0;
+	int irq;
+	int ret;
+	u32 ier;
+	u8 *buff;
+
+	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
+	if (!udc)
+		return -ENOMEM;
+
+	/* Create a dummy request for GET_STATUS, SET_ADDRESS */
+	udc->req = devm_kzalloc(&pdev->dev, sizeof(struct xusb_req),
+				GFP_KERNEL);
+	if (!udc->req)
+		return -ENOMEM;
+
+	buff = devm_kzalloc(&pdev->dev, STATUSBUFF_SIZE, GFP_KERNEL);
+	if (!buff)
+		return -ENOMEM;
+
+	udc->req->usb_req.buf = buff;
+
+	/* Map the registers */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	udc->addr = devm_ioremap_resource(&pdev->dev, res);
+	if (!udc->addr)
+		return -ENOMEM;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "unable to get irq\n");
+		return irq;
+	}
+	ret = devm_request_irq(&pdev->dev, irq, xudc_irq, 0,
+			       dev_name(&pdev->dev), udc);
+	if (ret < 0) {
+		dev_dbg(&pdev->dev, "unable to request irq %d", irq);
+		goto fail;
+	}
+
+	udc->dma_enabled = of_property_read_bool(np, "xlnx,has-builtin-dma");
+
+	/* Setup gadget structure */
+	udc->gadget.ops = &xusb_udc_ops;
+	udc->gadget.max_speed = USB_SPEED_HIGH;
+	udc->gadget.speed = USB_SPEED_UNKNOWN;
+	udc->gadget.ep0 = &udc->ep[XUSB_EP_NUMBER_ZERO].ep_usb;
+	udc->gadget.name = driver_name;
+
+	spin_lock_init(&udc->lock);
+
+	/* Check for IP endianness */
+	udc->write_fn = xudc_write32_be;
+	udc->read_fn = xudc_read32_be;
+	udc->write_fn(udc->addr, XUSB_TESTMODE_OFFSET, TEST_J);
+	if ((udc->read_fn(udc->addr + XUSB_TESTMODE_OFFSET))
+			!= TEST_J) {
+		udc->write_fn = xudc_write32;
+		udc->read_fn = xudc_read32;
+	}
+	udc->write_fn(udc->addr, XUSB_TESTMODE_OFFSET, 0);
+
+	xudc_eps_init(udc);
+
+	ep0 = &udc->ep[0];
+
+	/* Set device address to 0.*/
+	udc->write_fn(udc->addr, XUSB_ADDRESS_OFFSET, 0);
+
+	ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
+	if (ret)
+		goto fail;
+
+	udc->dev = &udc->gadget.dev;
+
+	/* Enable the interrupts.*/
+	ier = XUSB_STATUS_GLOBAL_INTR_MASK | XUSB_STATUS_INTR_EVENT_MASK |
+	      XUSB_STATUS_FIFO_BUFF_RDY_MASK | XUSB_STATUS_FIFO_BUFF_FREE_MASK |
+	      XUSB_STATUS_SETUP_PACKET_MASK |
+	      XUSB_STATUS_INTR_BUFF_COMP_ALL_MASK;
+
+	udc->write_fn(udc->addr, XUSB_IER_OFFSET, ier);
+
+	platform_set_drvdata(pdev, udc);
+
+	dev_vdbg(&pdev->dev, "%s at 0x%08X mapped to 0x%08X %s\n",
+		 driver_name, (u32)res->start, (u32 __force)udc->addr,
+		 udc->dma_enabled ? "with DMA" : "without DMA");
+
+	return 0;
+fail:
+	dev_err(&pdev->dev, "probe failed, %d\n", ret);
+	return ret;
+}
+
+/**
+ * xudc_remove - Releases the resources allocated during the initialization.
+ * @pdev: pointer to the platform device structure.
+ *
+ * Return: 0 always
+ */
+static int xudc_remove(struct platform_device *pdev)
+{
+	struct xusb_udc *udc = platform_get_drvdata(pdev);
+
+	usb_del_gadget_udc(&udc->gadget);
+
+	return 0;
+}
+
+/* Match table for of_platform binding */
+static const struct of_device_id usb_of_match[] = {
+	{ .compatible = "xlnx,usb2-device-4.00.a", },
+	{ /* end of list */ },
+};
+MODULE_DEVICE_TABLE(of, usb_of_match);
+
+static struct platform_driver xudc_driver = {
+	.driver = {
+		.name = driver_name,
+		.of_match_table = usb_of_match,
+	},
+	.probe = xudc_probe,
+	.remove = xudc_remove,
+};
+
+module_platform_driver(xudc_driver);
+
+MODULE_DESCRIPTION("Xilinx udc driver");
+MODULE_AUTHOR("Xilinx, Inc");
+MODULE_LICENSE("GPL");

drivers/usb/misc/usbtest.c

···
 	unsigned		autoconf:1;
 	unsigned		ctrl_out:1;
 	unsigned		iso:1;		/* try iso in/out */
+	unsigned		intr:1;		/* try interrupt in/out */
 	int			alt;
 };
 
···
 	int			out_pipe;
 	int			in_iso_pipe;
 	int			out_iso_pipe;
+	int			in_int_pipe;
+	int			out_int_pipe;
 	struct usb_endpoint_descriptor	*iso_in, *iso_out;
+	struct usb_endpoint_descriptor	*int_in, *int_out;
 	struct mutex		lock;
 
 #define TBUF_SIZE	256
···
 	struct usb_host_interface	*alt;
 	struct usb_host_endpoint	*in, *out;
 	struct usb_host_endpoint	*iso_in, *iso_out;
+	struct usb_host_endpoint	*int_in, *int_out;
 	struct usb_device		*udev;
 
 	for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
···
 
 		in = out = NULL;
 		iso_in = iso_out = NULL;
+		int_in = int_out = NULL;
 		alt = intf->altsetting + tmp;
 
 		if (override_alt >= 0 &&
···
 			switch (usb_endpoint_type(&e->desc)) {
 			case USB_ENDPOINT_XFER_BULK:
 				break;
+			case USB_ENDPOINT_XFER_INT:
+				if (dev->info->intr)
+					goto try_intr;
 			case USB_ENDPOINT_XFER_ISOC:
 				if (dev->info->iso)
 					goto try_iso;
···
 					out = e;
 			}
 			continue;
+try_intr:
+			if (usb_endpoint_dir_in(&e->desc)) {
+				if (!int_in)
+					int_in = e;
+			} else {
+				if (!int_out)
+					int_out = e;
+			}
+			continue;
 try_iso:
 			if (usb_endpoint_dir_in(&e->desc)) {
 				if (!iso_in)
···
 					iso_out = e;
 			}
 		}
-		if ((in && out)  ||  iso_in || iso_out)
+		if ((in && out)  ||  iso_in || iso_out || int_in || int_out)
 			goto found;
 	}
 	return -EINVAL;
···
 				iso_out->desc.bEndpointAddress
 					& USB_ENDPOINT_NUMBER_MASK);
 	}
+
+	if (int_in) {
+		dev->int_in = &int_in->desc;
+		dev->in_int_pipe = usb_rcvintpipe(udev,
+				int_in->desc.bEndpointAddress
+					& USB_ENDPOINT_NUMBER_MASK);
+	}
+
+	if (int_out) {
+		dev->int_out = &int_out->desc;
+		dev->out_int_pipe = usb_sndintpipe(udev,
+				int_out->desc.bEndpointAddress
+					& USB_ENDPOINT_NUMBER_MASK);
+	}
 	return 0;
 }
 
···
 	int			pipe,
 	unsigned long		bytes,
 	unsigned		transfer_flags,
-	unsigned		offset)
+	unsigned		offset,
+	u8			bInterval)
 {
 	struct urb		*urb;
 
 	urb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!urb)
 		return urb;
-	usb_fill_bulk_urb(urb, udev, pipe, NULL, bytes, simple_callback, NULL);
+
+	if (bInterval)
+		usb_fill_int_urb(urb, udev, pipe, NULL, bytes, simple_callback,
+				NULL, bInterval);
+	else
+		usb_fill_bulk_urb(urb, udev, pipe, NULL, bytes, simple_callback,
+				NULL);
+
 	urb->interval = (udev->speed == USB_SPEED_HIGH)
 			? (INTERRUPT_RATE << 3)
 			: INTERRUPT_RATE;
···
 static struct urb *simple_alloc_urb(
 	struct usb_device	*udev,
 	int			pipe,
-	unsigned long		bytes)
+	unsigned long		bytes,
+	u8			bInterval)
 {
-	return usbtest_alloc_urb(udev, pipe, bytes, URB_NO_TRANSFER_DMA_MAP, 0);
+	return usbtest_alloc_urb(udev, pipe, bytes, URB_NO_TRANSFER_DMA_MAP, 0,
+			bInterval);
 }
 
 static unsigned pattern;
···
 			goto cleanup;
 		}
 		req.wLength = cpu_to_le16(len);
-		urb[i] = u = simple_alloc_urb(udev, pipe, len);
+		urb[i] = u = simple_alloc_urb(udev, pipe, len, 0);
 		if (!u)
 			goto cleanup;
 
···
 	int			retval = 0;
 
 	init_completion(&completion);
-	urb = simple_alloc_urb(testdev_to_usbdev(dev), pipe, size);
+	urb = simple_alloc_urb(testdev_to_usbdev(dev), pipe, size, 0);
 	if (!urb)
 		return -ENOMEM;
 	urb->context = &completion;
···
 	struct usb_device	*udev = testdev_to_usbdev(dev);
 
 	if (udev->speed == USB_SPEED_SUPER)
-		urb = simple_alloc_urb(udev, 0, 1024);
+		urb = simple_alloc_urb(udev, 0, 1024, 0);
 	else
-		urb = simple_alloc_urb(udev, 0, 512);
+		urb = simple_alloc_urb(udev, 0, 512, 0);
 	if (urb == NULL)
 		return -ENOMEM;
 
···
 {
 	int retval;
 	struct urb *urb = usbtest_alloc_urb(
-		testdev_to_usbdev(tdev), pipe, length, transfer_flags, 1);
+		testdev_to_usbdev(tdev), pipe, length, transfer_flags, 1, 0);
 
 	if (!urb)
 		return -ENOMEM;
···
 		dev_info(&intf->dev,
 				"TEST 1:  write %d bytes %u times\n",
 				param->length, param->iterations);
-		urb = simple_alloc_urb(udev, dev->out_pipe, param->length);
+		urb = simple_alloc_urb(udev, dev->out_pipe, param->length, 0);
 		if (!urb) {
 			retval = -ENOMEM;
 			break;
···
 		dev_info(&intf->dev,
 				"TEST 2:  read %d bytes %u times\n",
 				param->length, param->iterations);
-		urb = simple_alloc_urb(udev, dev->in_pipe, param->length);
+		urb = simple_alloc_urb(udev, dev->in_pipe, param->length, 0);
 		if (!urb) {
 			retval = -ENOMEM;
 			break;
···
 		dev_info(&intf->dev,
 				"TEST 3:  write/%d 0..%d bytes %u times\n",
 				param->vary, param->length, param->iterations);
-		urb = simple_alloc_urb(udev, dev->out_pipe, param->length);
+		urb = simple_alloc_urb(udev, dev->out_pipe, param->length, 0);
 		if (!urb) {
 			retval = -ENOMEM;
 			break;
···
 		dev_info(&intf->dev,
 				"TEST 4:  read/%d 0..%d bytes %u times\n",
 				param->vary, param->length, param->iterations);
-		urb = simple_alloc_urb(udev, dev->in_pipe, param->length);
+		urb = simple_alloc_urb(udev, dev->in_pipe, param->length, 0);
 		if (!urb) {
 			retval = -ENOMEM;
 			break;
···
 		}
 		break;
 
+	/* Simple non-queued interrupt I/O tests */
+	case 25:
+		if (dev->out_int_pipe == 0)
+			break;
+		dev_info(&intf->dev,
+				"TEST 25: write %d bytes %u times\n",
+				param->length, param->iterations);
+		urb = simple_alloc_urb(udev, dev->out_int_pipe, param->length,
+				dev->int_out->bInterval);
+		if (!urb) {
+			retval = -ENOMEM;
+			break;
+		}
+		/* FIRMWARE: interrupt sink (maybe accepts short writes) */
+		retval = simple_io(dev, urb, param->iterations, 0, 0, "test25");
+		simple_free_urb(urb);
+		break;
+	case 26:
+		if (dev->in_int_pipe == 0)
+			break;
+		dev_info(&intf->dev,
+				"TEST 26: read %d bytes %u times\n",
+				param->length, param->iterations);
+		urb = simple_alloc_urb(udev, dev->in_int_pipe, param->length,
+				dev->int_in->bInterval);
+		if (!urb) {
+			retval = -ENOMEM;
+			break;
+		}
+		/* FIRMWARE: interrupt source (maybe generates short writes) */
+		retval = simple_io(dev, urb, param->iterations, 0, 0, "test26");
+		simple_free_urb(urb);
+		break;
 	}
 	do_gettimeofday(&param->duration);
 	param->duration.tv_sec -= start.tv_sec;
···
 	struct usbtest_info	*info;
 	char			*rtest, *wtest;
 	char			*irtest, *iwtest;
+	char			*intrtest, *intwtest;
 
 	udev = interface_to_usbdev(intf);
 
···
 	 */
 	rtest = wtest = "";
 	irtest = iwtest = "";
+	intrtest = intwtest = "";
 	if (force_interrupt || udev->speed == USB_SPEED_LOW) {
 		if (info->ep_in) {
 			dev->in_pipe = usb_rcvintpipe(udev, info->ep_in);
···
 			irtest = " iso-in";
 		if (dev->out_iso_pipe)
 			iwtest = " iso-out";
+		if (dev->in_int_pipe)
+			intrtest = " int-in";
+		if (dev->out_int_pipe)
+			intwtest = " int-out";
 	}
 
 	usb_set_intfdata(intf, dev);
 	dev_info(&intf->dev, "%s\n", info->name);
-	dev_info(&intf->dev, "%s {control%s%s%s%s%s} tests%s\n",
+	dev_info(&intf->dev, "%s {control%s%s%s%s%s%s%s} tests%s\n",
 			usb_speed_string(udev->speed),
 			info->ctrl_out ? " in/out" : "",
 			rtest, wtest,
 			irtest, iwtest,
+			intrtest, intwtest,
 			info->alt >= 0 ? " (+alt)" : "");
 	return 0;
 }
···
 	.autoconf	= 1,
 	.ctrl_out	= 1,
 	.iso		= 1,
+	.intr		= 1,
 	.alt		= 0,
 };
 

drivers/usb/musb/musb_cppi41.c

···
 	if (!list_empty(&controller->early_tx_list)) {
 		ret = HRTIMER_RESTART;
 		hrtimer_forward_now(&controller->early_tx,
-				ktime_set(0, 50 * NSEC_PER_USEC));
+				ktime_set(0, 20 * NSEC_PER_USEC));
 	}
 
 	spin_unlock_irqrestore(&musb->lock, flags);
···
 
 			hrtimer_start_range_ns(&controller->early_tx,
 				ktime_set(0, usecs * NSEC_PER_USEC),
-				40 * NSEC_PER_USEC,
+				20 * NSEC_PER_USEC,
 				HRTIMER_MODE_REL);
 		}
 	}

drivers/usb/musb/musb_dsps.c

···
 	struct musb *musb = platform_get_drvdata(glue->musb);
 	void __iomem *mbase = musb->ctrl_base;
 
+	del_timer_sync(&glue->timer);
 	glue->context.control = dsps_readl(mbase, wrp->control);
 	glue->context.epintr = dsps_readl(mbase, wrp->epintr_set);
 	glue->context.coreintr = dsps_readl(mbase, wrp->coreintr_set);
···
 	dsps_writel(mbase, wrp->mode, glue->context.mode);
 	dsps_writel(mbase, wrp->tx_mode, glue->context.tx_mode);
 	dsps_writel(mbase, wrp->rx_mode, glue->context.rx_mode);
+	setup_timer(&glue->timer, otg_timer, (unsigned long) musb);
 
 	return 0;
 }

drivers/usb/phy/Kconfig

···
 	  This driver provides common interface to interact, for Samsung USB 2.0 PHY
 	  driver and later for Samsung USB 3.0 PHY driver.
 
-config SAMSUNG_USB2PHY
-	tristate "Samsung USB 2.0 PHY controller Driver"
-	select SAMSUNG_USBPHY
-	select USB_PHY
-	help
-	  Enable this to support Samsung USB 2.0 (High Speed) PHY controller
-	  driver for Samsung SoCs.
-
-config SAMSUNG_USB3PHY
-	tristate "Samsung USB 3.0 PHY controller Driver"
-	select SAMSUNG_USBPHY
-	select USB_PHY
-	help
-	  Enable this to support Samsung USB 3.0 (Super Speed) phy controller
-	  for samsung SoCs.
-
 config TWL6030_USB
 	tristate "TWL6030 USB Transceiver Driver"
 	depends on TWL4030_CORE && OMAP_USB2 && USB_MUSB_OMAP2PLUS

drivers/usb/phy/Makefile

···
 obj-$(CONFIG_AM335X_PHY_USB)		+= phy-am335x.o
 obj-$(CONFIG_OMAP_OTG)			+= phy-omap-otg.o
 obj-$(CONFIG_SAMSUNG_USBPHY)		+= phy-samsung-usb.o
-obj-$(CONFIG_SAMSUNG_USB2PHY)		+= phy-samsung-usb2.o
-obj-$(CONFIG_SAMSUNG_USB3PHY)		+= phy-samsung-usb3.o
 obj-$(CONFIG_TWL6030_USB)		+= phy-twl6030-usb.o
 obj-$(CONFIG_USB_EHCI_TEGRA)		+= phy-tegra-usb.o
 obj-$(CONFIG_USB_GPIO_VBUS)		+= phy-gpio-vbus-usb.o

drivers/usb/phy/phy-msm-usb.c

···
 {
 	int ret = 0;
 
-	if (motg->pdata->phy_clk_reset && motg->phy_reset_clk)
+	if (motg->pdata->phy_clk_reset)
 		ret = motg->pdata->phy_clk_reset(motg->phy_reset_clk);
 	else if (motg->phy_rst)
 		ret = reset_control_reset(motg->phy_rst);
···
 	return status;
 }
 
-const struct file_operations msm_otg_mode_fops = {
+static const struct file_operations msm_otg_mode_fops = {
 	.open = msm_otg_mode_open,
 	.read = seq_read,
 	.write = msm_otg_mode_write,
···
 	phy = &motg->phy;
 	phy->dev = &pdev->dev;
 
-	motg->phy_reset_clk = devm_clk_get(&pdev->dev,
+	if (motg->pdata->phy_clk_reset) {
+		motg->phy_reset_clk = devm_clk_get(&pdev->dev,
 					   np ? "phy" : "usb_phy_clk");
-	if (IS_ERR(motg->phy_reset_clk)) {
-		dev_err(&pdev->dev, "failed to get usb_phy_clk\n");
-		motg->phy_reset_clk = NULL;
+
+		if (IS_ERR(motg->phy_reset_clk)) {
+			dev_err(&pdev->dev, "failed to get usb_phy_clk\n");
+			return PTR_ERR(motg->phy_reset_clk);
+		}
 	}
 
 	motg->clk = devm_clk_get(&pdev->dev, np ? "core" : "usb_hs_clk");

drivers/usb/phy/phy-mxs-usb.c

···
 		MXS_PHY_NEED_IP_FIX,
 };
 
+static const struct mxs_phy_data vf610_phy_data = {
+	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
+		MXS_PHY_NEED_IP_FIX,
+};
+
 static const struct mxs_phy_data imx6sx_phy_data = {
 	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
 		MXS_PHY_NEED_IP_FIX,
···
 	{ .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_phy_data, },
 	{ .compatible = "fsl,imx6q-usbphy", .data = &imx6q_phy_data, },
 	{ .compatible = "fsl,imx23-usbphy", .data = &imx23_phy_data, },
+	{ .compatible = "fsl,vf610-usbphy", .data = &vf610_phy_data, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);

drivers/usb/phy/phy-samsung-usb.c

···
-/* linux/drivers/usb/phy/phy-samsung-usb.c
- *
- * Copyright (c) 2012 Samsung Electronics Co., Ltd.
- *              http://www.samsung.com
- *
- * Author: Praveen Paneri <[e-mail]>
- *
- * Samsung USB-PHY helper driver with common function calls;
- * interacts with Samsung USB 2.0 PHY controller driver and later
- * with Samsung USB 3.0 PHY driver.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/clk.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/usb/samsung_usb_phy.h>
-
-#include "phy-samsung-usb.h"
-
-int samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
-{
-	struct device_node *usbphy_sys;
-
-	/* Getting node for system controller interface for usb-phy */
-	usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
-	if (!usbphy_sys) {
-		dev_err(sphy->dev, "No sys-controller interface for usb-phy\n");
-		return -ENODEV;
-	}
-
-	sphy->pmuregs = of_iomap(usbphy_sys, 0);
-
-	if (sphy->pmuregs == NULL) {
-		dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
-		goto err0;
-	}
-
-	sphy->sysreg = of_iomap(usbphy_sys, 1);
-
-	/*
-	 * Not returning error code here, since this situation is not fatal.
-	 * Few SoCs may not have this switch available
-	 */
-	if (sphy->sysreg == NULL)
-		dev_warn(sphy->dev, "Can't get usb-phy sysreg cfg register\n");
-
-	of_node_put(usbphy_sys);
-
-	return 0;
-
-err0:
-	of_node_put(usbphy_sys);
-	return -ENXIO;
-}
-EXPORT_SYMBOL_GPL(samsung_usbphy_parse_dt);
-
-/*
- * Set isolation here for phy.
- * Here 'on = true' would mean USB PHY block is isolated, hence
- * de-activated and vice-versa.
- */
-void samsung_usbphy_set_isolation_4210(struct samsung_usbphy *sphy, bool on)
-{
-	void __iomem *reg = NULL;
-	u32 reg_val;
-	u32 en_mask = 0;
-
-	if (!sphy->pmuregs) {
-		dev_warn(sphy->dev, "Can't set pmu isolation\n");
-		return;
-	}
-
-	if (sphy->phy_type == USB_PHY_TYPE_DEVICE) {
-		reg = sphy->pmuregs + sphy->drv_data->devphy_reg_offset;
-		en_mask = sphy->drv_data->devphy_en_mask;
-	} else if (sphy->phy_type == USB_PHY_TYPE_HOST) {
-		reg = sphy->pmuregs + sphy->drv_data->hostphy_reg_offset;
-		en_mask = sphy->drv_data->hostphy_en_mask;
-	}
-
-	reg_val = readl(reg);
-
-	if (on)
-		reg_val &= ~en_mask;
-	else
-		reg_val |= en_mask;
-
-	writel(reg_val, reg);
-
-	if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12) {
-		writel(reg_val, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL0);
-		writel(reg_val, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL1);
-	}
-}
-EXPORT_SYMBOL_GPL(samsung_usbphy_set_isolation_4210);
-
-/*
- * Configure the mode of working of usb-phy here: HOST/DEVICE.
- */
-void samsung_usbphy_cfg_sel(struct samsung_usbphy *sphy)
-{
-	u32 reg;
-
-	if (!sphy->sysreg) {
-		dev_warn(sphy->dev, "Can't configure specified phy mode\n");
-		return;
-	}
-
-	reg = readl(sphy->sysreg);
-
-	if (sphy->phy_type == USB_PHY_TYPE_DEVICE)
-		reg &= ~EXYNOS_USB20PHY_CFG_HOST_LINK;
-	else if (sphy->phy_type == USB_PHY_TYPE_HOST)
-		reg |= EXYNOS_USB20PHY_CFG_HOST_LINK;
-
-	writel(reg, sphy->sysreg);
-}
-EXPORT_SYMBOL_GPL(samsung_usbphy_cfg_sel);
-
-/*
- * PHYs are different for USB Device and USB Host.
- * This make sure that correct PHY type is selected before
- * any operation on PHY.
- */
-int samsung_usbphy_set_type(struct usb_phy *phy,
-				enum samsung_usb_phy_type phy_type)
-{
-	struct samsung_usbphy *sphy = phy_to_sphy(phy);
-
-	sphy->phy_type = phy_type;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(samsung_usbphy_set_type);
-
-int samsung_usbphy_rate_to_clksel_64xx(struct samsung_usbphy *sphy,
-							unsigned long rate)
-{
-	unsigned int clksel;
-
-	switch (rate) {
-	case 12 * MHZ:
-		clksel = PHYCLK_CLKSEL_12M;
-		break;
-	case 24 * MHZ:
-		clksel = PHYCLK_CLKSEL_24M;
-		break;
-	case 48 * MHZ:
-		clksel = PHYCLK_CLKSEL_48M;
-		break;
-	default:
-		dev_err(sphy->dev,
-			"Invalid reference clock frequency: %lu\n", rate);
-		return -EINVAL;
-	}
-
-	return clksel;
-}
-EXPORT_SYMBOL_GPL(samsung_usbphy_rate_to_clksel_64xx);
-
-int samsung_usbphy_rate_to_clksel_4x12(struct samsung_usbphy *sphy,
-							unsigned long rate)
-{
-	unsigned int clksel;
-
-	switch (rate) {
-	case 9600 * KHZ:
-		clksel = FSEL_CLKSEL_9600K;
-		break;
-	case 10 * MHZ:
-		clksel = FSEL_CLKSEL_10M;
-		break;
-	case 12 * MHZ:
-		clksel = FSEL_CLKSEL_12M;
-		break;
-	case 19200 * KHZ:
-		clksel = FSEL_CLKSEL_19200K;
-		break;
-	case 20 * MHZ:
-		clksel = FSEL_CLKSEL_20M;
-		break;
-	case 24 * MHZ:
-		clksel = FSEL_CLKSEL_24M;
-		break;
-	case 50 * MHZ:
-		clksel = FSEL_CLKSEL_50M;
-		break;
-	default:
-		dev_err(sphy->dev,
-			"Invalid reference clock frequency: %lu\n", rate);
-		return -EINVAL;
-	}
-
-	return clksel;
-}
-EXPORT_SYMBOL_GPL(samsung_usbphy_rate_to_clksel_4x12);
-
-/*
- * Returns reference clock frequency selection value
- */
-int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
-{
-	struct clk *ref_clk;
-	unsigned long rate;
-	int refclk_freq;
-
-	/*
-	 * In exynos5250 USB host and device PHY use
-	 * external crystal clock XXTI
-	 */
-	if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
-		ref_clk = clk_get(sphy->dev, "ext_xtal");
-	else
-		ref_clk = clk_get(sphy->dev, "xusbxti");
-	if (IS_ERR(ref_clk)) {
-		dev_err(sphy->dev, "Failed to get reference clock\n");
-		return PTR_ERR(ref_clk);
-	}
-
-	rate = clk_get_rate(ref_clk);
-	refclk_freq = sphy->drv_data->rate_to_clksel(sphy, rate);
-
-	clk_put(ref_clk);
-
-	return refclk_freq;
-}
-EXPORT_SYMBOL_GPL(samsung_usbphy_get_refclk_freq);

drivers/usb/phy/phy-samsung-usb.h

···
-/* linux/drivers/usb/phy/phy-samsung-usb.h
- *
- * Copyright (c) 2012 Samsung Electronics Co., Ltd.
- *              http://www.samsung.com
- *
- * Samsung USB-PHY transceiver; talks to S3C HS OTG controller, EHCI-S5P and
- * OHCI-EXYNOS controllers.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/usb/phy.h>
-
-/* Register definitions */
-
-#define SAMSUNG_PHYPWR				(0x00)
-
-#define PHYPWR_NORMAL_MASK			(0x19 << 0)
-#define PHYPWR_OTG_DISABLE			(0x1 << 4)
-#define PHYPWR_ANALOG_POWERDOWN			(0x1 << 3)
-#define PHYPWR_FORCE_SUSPEND			(0x1 << 1)
-/* For Exynos4 */
-#define PHYPWR_NORMAL_MASK_PHY0			(0x39 << 0)
-#define PHYPWR_SLEEP_PHY0			(0x1 << 5)
-
-#define SAMSUNG_PHYCLK				(0x04)
-
-#define PHYCLK_MODE_USB11			(0x1 << 6)
-#define PHYCLK_EXT_OSC				(0x1 << 5)
-#define PHYCLK_COMMON_ON_N			(0x1 << 4)
-#define PHYCLK_ID_PULL				(0x1 << 2)
-#define PHYCLK_CLKSEL_MASK			(0x3 << 0)
-#define PHYCLK_CLKSEL_48M			(0x0 << 0)
-#define PHYCLK_CLKSEL_12M			(0x2 << 0)
-#define PHYCLK_CLKSEL_24M			(0x3 << 0)
-
-#define SAMSUNG_RSTCON				(0x08)
-
-#define RSTCON_PHYLINK_SWRST			(0x1 << 2)
-#define RSTCON_HLINK_SWRST			(0x1 << 1)
-#define RSTCON_SWRST				(0x1 << 0)
-
-/* EXYNOS4X12 */
-#define EXYNOS4X12_PHY_HSIC_CTRL0		(0x04)
-#define EXYNOS4X12_PHY_HSIC_CTRL1		(0x08)
-
-#define PHYPWR_NORMAL_MASK_HSIC1		(0x7 << 12)
-#define PHYPWR_NORMAL_MASK_HSIC0		(0x7 << 9)
-#define PHYPWR_NORMAL_MASK_PHY1			(0x7 << 6)
-
-#define RSTCON_HOSTPHY_SWRST			(0xf << 3)
-
-/* EXYNOS5 */
-#define EXYNOS5_PHY_HOST_CTRL0			(0x00)
-
-#define HOST_CTRL0_PHYSWRSTALL			(0x1 << 31)
-
-#define HOST_CTRL0_REFCLKSEL_MASK		(0x3 << 19)
-#define HOST_CTRL0_REFCLKSEL_XTAL		(0x0 << 19)
-#define HOST_CTRL0_REFCLKSEL_EXTL		(0x1 << 19)
-#define HOST_CTRL0_REFCLKSEL_CLKCORE		(0x2 << 19)
-
-#define HOST_CTRL0_FSEL_MASK			(0x7 << 16)
-#define HOST_CTRL0_FSEL(_x)			((_x) << 16)
-
-#define FSEL_CLKSEL_50M				(0x7)
-#define FSEL_CLKSEL_24M				(0x5)
-#define FSEL_CLKSEL_20M				(0x4)
-#define FSEL_CLKSEL_19200K			(0x3)
-#define FSEL_CLKSEL_12M				(0x2)
-#define FSEL_CLKSEL_10M				(0x1)
-#define FSEL_CLKSEL_9600K			(0x0)
-
-#define HOST_CTRL0_TESTBURNIN			(0x1 << 11)
-#define HOST_CTRL0_RETENABLE			(0x1 << 10)
-#define HOST_CTRL0_COMMONON_N			(0x1 << 9)
-#define HOST_CTRL0_SIDDQ			(0x1 << 6)
-#define HOST_CTRL0_FORCESLEEP			(0x1 << 5)
-#define HOST_CTRL0_FORCESUSPEND			(0x1 << 4)
-#define HOST_CTRL0_WORDINTERFACE		(0x1 << 3)
-#define HOST_CTRL0_UTMISWRST			(0x1 << 2)
-#define HOST_CTRL0_LINKSWRST			(0x1 << 1)
-#define HOST_CTRL0_PHYSWRST			(0x1 << 0)
-
-#define EXYNOS5_PHY_HOST_TUNE0			(0x04)
-
-#define EXYNOS5_PHY_HSIC_CTRL1			(0x10)
-
-#define EXYNOS5_PHY_HSIC_TUNE1			(0x14)
-
-#define EXYNOS5_PHY_HSIC_CTRL2			(0x20)
-
-#define EXYNOS5_PHY_HSIC_TUNE2			(0x24)
-
-#define HSIC_CTRL_REFCLKSEL_MASK		(0x3 << 23)
-#define HSIC_CTRL_REFCLKSEL			(0x2 << 23)
-
-#define HSIC_CTRL_REFCLKDIV_MASK		(0x7f << 16)
-#define HSIC_CTRL_REFCLKDIV(_x)			((_x) << 16)
-#define HSIC_CTRL_REFCLKDIV_12			(0x24 << 16)
-#define HSIC_CTRL_REFCLKDIV_15			(0x1c << 16)
-#define HSIC_CTRL_REFCLKDIV_16			(0x1a << 16)
-#define HSIC_CTRL_REFCLKDIV_19_2		(0x15 << 16)
-#define HSIC_CTRL_REFCLKDIV_20			(0x14 << 16)
-
-#define HSIC_CTRL_SIDDQ				(0x1 << 6)
-#define HSIC_CTRL_FORCESLEEP			(0x1 << 5)
-#define HSIC_CTRL_FORCESUSPEND			(0x1 << 4)
-#define HSIC_CTRL_WORDINTERFACE			(0x1 << 3)
-#define HSIC_CTRL_UTMISWRST			(0x1 << 2)
-#define HSIC_CTRL_PHYSWRST			(0x1 << 0)
-
-#define EXYNOS5_PHY_HOST_EHCICTRL		(0x30)
-
-#define HOST_EHCICTRL_ENAINCRXALIGN		(0x1 << 29)
-#define HOST_EHCICTRL_ENAINCR4			(0x1 << 28)
-#define HOST_EHCICTRL_ENAINCR8			(0x1 << 27)
-#define HOST_EHCICTRL_ENAINCR16			(0x1 << 26)
-
-#define EXYNOS5_PHY_HOST_OHCICTRL		(0x34)
-
-#define HOST_OHCICTRL_SUSPLGCY			(0x1 << 3)
-#define HOST_OHCICTRL_APPSTARTCLK		(0x1 << 2)
-#define HOST_OHCICTRL_CNTSEL			(0x1 << 1)
-#define HOST_OHCICTRL_CLKCKTRST			(0x1 << 0)
-
-#define EXYNOS5_PHY_OTG_SYS			(0x38)
-
-#define OTG_SYS_PHYLINK_SWRESET			(0x1 << 14)
-#define OTG_SYS_LINKSWRST_UOTG			(0x1 << 13)
-#define OTG_SYS_PHY0_SWRST			(0x1 << 12)
-
-#define OTG_SYS_REFCLKSEL_MASK			(0x3 << 9)
-#define OTG_SYS_REFCLKSEL_XTAL			(0x0 << 9)
-#define OTG_SYS_REFCLKSEL_EXTL			(0x1 << 9)
-#define OTG_SYS_REFCLKSEL_CLKCORE		(0x2 << 9)
-
-#define OTG_SYS_IDPULLUP_UOTG			(0x1 << 8)
-#define OTG_SYS_COMMON_ON			(0x1 << 7)
-
-#define OTG_SYS_FSEL_MASK			(0x7 << 4)
-#define OTG_SYS_FSEL(_x)			((_x) << 4)
-
-#define OTG_SYS_FORCESLEEP			(0x1 << 3)
-#define OTG_SYS_OTGDISABLE			(0x1 << 2)
-#define OTG_SYS_SIDDQ_UOTG			(0x1 << 1)
-#define OTG_SYS_FORCESUSPEND			(0x1 << 0)
-
-#define EXYNOS5_PHY_OTG_TUNE			(0x40)
-
-/* EXYNOS5: USB 3.0 DRD */
-#define EXYNOS5_DRD_LINKSYSTEM			(0x04)
-
-#define LINKSYSTEM_FLADJ_MASK			(0x3f << 1)
-#define LINKSYSTEM_FLADJ(_x)			((_x) << 1)
-#define LINKSYSTEM_XHCI_VERSION_CONTROL		(0x1 << 27)
-
-#define EXYNOS5_DRD_PHYUTMI			(0x08)
-
-#define PHYUTMI_OTGDISABLE			(0x1 << 6)
-#define PHYUTMI_FORCESUSPEND			(0x1 << 1)
-#define PHYUTMI_FORCESLEEP			(0x1 << 0)
-
-#define EXYNOS5_DRD_PHYPIPE			(0x0c)
-
-#define EXYNOS5_DRD_PHYCLKRST			(0x10)
-
-#define PHYCLKRST_SSC_REFCLKSEL_MASK		(0xff << 23)
-#define PHYCLKRST_SSC_REFCLKSEL(_x)		((_x) << 23)
-
-#define PHYCLKRST_SSC_RANGE_MASK		(0x03 << 21)
-#define PHYCLKRST_SSC_RANGE(_x)			((_x) << 21)
-
-#define PHYCLKRST_SSC_EN			(0x1 << 20)
-#define PHYCLKRST_REF_SSP_EN			(0x1 << 19)
-#define PHYCLKRST_REF_CLKDIV2			(0x1 << 18)
-
-#define PHYCLKRST_MPLL_MULTIPLIER_MASK		(0x7f << 11)
-#define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF	(0x19 << 11)
-#define PHYCLKRST_MPLL_MULTIPLIER_50M_REF	(0x02 << 11)
-#define PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF	(0x68 << 11)
-#define PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF	(0x7d << 11)
-#define PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF	(0x02 << 11)
-
-#define PHYCLKRST_FSEL_MASK			(0x3f << 5)
-#define PHYCLKRST_FSEL(_x)			((_x) << 5)
-#define PHYCLKRST_FSEL_PAD_100MHZ		(0x27 << 5)
-#define PHYCLKRST_FSEL_PAD_24MHZ		(0x2a << 5)
-#define PHYCLKRST_FSEL_PAD_20MHZ		(0x31 << 5)
-#define PHYCLKRST_FSEL_PAD_19_2MHZ		(0x38 << 5)
-
-#define PHYCLKRST_RETENABLEN			(0x1 << 4)
-
-#define PHYCLKRST_REFCLKSEL_MASK		(0x03 << 2)
-#define PHYCLKRST_REFCLKSEL_PAD_REFCLK		(0x2 << 2)
-#define PHYCLKRST_REFCLKSEL_EXT_REFCLK		(0x3 << 2)
-
-#define PHYCLKRST_PORTRESET			(0x1 << 1)
-#define PHYCLKRST_COMMONONN			(0x1 << 0)
-
-#define EXYNOS5_DRD_PHYREG0			(0x14)
-#define EXYNOS5_DRD_PHYREG1			(0x18)
-
-#define EXYNOS5_DRD_PHYPARAM0			(0x1c)
-
-#define PHYPARAM0_REF_USE_PAD			(0x1 << 31)
-#define PHYPARAM0_REF_LOSLEVEL_MASK		(0x1f << 26)
-#define PHYPARAM0_REF_LOSLEVEL			(0x9 << 26)
-
-#define EXYNOS5_DRD_PHYPARAM1			(0x20)
-
-#define PHYPARAM1_PCS_TXDEEMPH_MASK		(0x3f << 0)
-#define PHYPARAM1_PCS_TXDEEMPH			(0x1c)
-
-#define EXYNOS5_DRD_PHYTERM			(0x24)
-
-#define EXYNOS5_DRD_PHYTEST			(0x28)
-
-#define PHYTEST_POWERDOWN_SSP			(0x1 << 3)
-#define PHYTEST_POWERDOWN_HSP			(0x1 << 2)
-
-#define EXYNOS5_DRD_PHYADP			(0x2c)
-
-#define EXYNOS5_DRD_PHYBATCHG			(0x30)
-
-#define PHYBATCHG_UTMI_CLKSEL			(0x1 << 2)
-
-#define EXYNOS5_DRD_PHYRESUME			(0x34)
-#define EXYNOS5_DRD_LINKPORT			(0x44)
-
-#ifndef MHZ
-#define MHZ (1000*1000)
-#endif
-
-#ifndef KHZ
-#define KHZ (1000)
-#endif
-
-#define EXYNOS_USBHOST_PHY_CTRL_OFFSET		(0x4)
-#define S3C64XX_USBPHY_ENABLE			(0x1 << 16)
-#define EXYNOS_USBPHY_ENABLE			(0x1 << 0)
-#define EXYNOS_USB20PHY_CFG_HOST_LINK		(0x1 << 0)
-
-enum samsung_cpu_type {
-	TYPE_S3C64XX,
-	TYPE_EXYNOS4210,
-	TYPE_EXYNOS4X12,
-	TYPE_EXYNOS5250,
-};
-
-struct samsung_usbphy;
-
-/*
- * struct samsung_usbphy_drvdata - driver data for various SoC variants
- * @cpu_type: machine identifier
- * @devphy_en_mask: device phy enable mask for PHY CONTROL register
- * @hostphy_en_mask: host phy enable mask for PHY CONTROL register
- * @devphy_reg_offset: offset to DEVICE PHY CONTROL register from
- *		       mapped address of system controller.
- * @hostphy_reg_offset: offset to HOST PHY CONTROL register from
- *		       mapped address of system controller.
- *
- *	Here we have a separate mask for device type phy.
- *	Having different masks for host and device type phy helps
- *	in setting independent masks in case of SoCs like S5PV210,
- *	in which PHY0 and PHY1 enable bits belong to same register
- *	placed at position 0 and 1 respectively.
- *	Although for newer SoCs like exynos these bits belong to
- *	different registers altogether placed at position 0.
- */
-struct samsung_usbphy_drvdata {
-	int cpu_type;
-	int devphy_en_mask;
-	int hostphy_en_mask;
-	u32 devphy_reg_offset;
-	u32 hostphy_reg_offset;
-	int (*rate_to_clksel)(struct samsung_usbphy *, unsigned long);
-	void (*set_isolation)(struct samsung_usbphy *, bool);
-	void (*phy_enable)(struct samsung_usbphy *);
-	void (*phy_disable)(struct samsung_usbphy *);
-};
-
-/*
- * struct samsung_usbphy - transceiver driver state
- * @phy: transceiver structure
- * @plat: platform data
- * @dev: The parent device supplied to the probe function
- * @clk: usb phy clock
- * @regs: usb phy controller registers memory base
- * @pmuregs: USB device PHY_CONTROL register memory base
- * @sysreg: USB2.0 PHY_CFG register memory base
- * @ref_clk_freq: reference clock frequency selection
- * @drv_data: driver data available for different SoCs
- * @phy_type: Samsung SoCs specific phy types:	#HOST
- *						#DEVICE
- * @phy_usage: usage count for phy
- * @lock: lock for phy operations
- */
-struct samsung_usbphy {
-	struct usb_phy	phy;
-	struct samsung_usbphy_data *plat;
-	struct device	*dev;
-	struct clk	*clk;
-	void __iomem	*regs;
-	void __iomem	*pmuregs;
-	void __iomem	*sysreg;
-	int		ref_clk_freq;
-	const struct samsung_usbphy_drvdata *drv_data;
-	enum samsung_usb_phy_type phy_type;
-	atomic_t	phy_usage;
-	spinlock_t	lock;
-};
-
-#define phy_to_sphy(x)		container_of((x), struct samsung_usbphy, phy)
-
-static const struct of_device_id samsung_usbphy_dt_match[];
-
-static inline const struct samsung_usbphy_drvdata
-*samsung_usbphy_get_driver_data(struct platform_device *pdev)
-{
-	if (pdev->dev.of_node) {
-		const struct of_device_id *match;
-		match = of_match_node(samsung_usbphy_dt_match,
-							pdev->dev.of_node);
-		return match->data;
-	}
-
-	return (struct samsung_usbphy_drvdata *)
-				platform_get_device_id(pdev)->driver_data;
-}
-
-extern int samsung_usbphy_parse_dt(struct samsung_usbphy *sphy);
-extern void samsung_usbphy_set_isolation_4210(struct samsung_usbphy *sphy,
-								bool on);
-extern void samsung_usbphy_cfg_sel(struct samsung_usbphy *sphy);
-extern int samsung_usbphy_set_type(struct usb_phy *phy,
-					enum samsung_usb_phy_type phy_type);
-extern int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy);
-extern int samsung_usbphy_rate_to_clksel_64xx(struct samsung_usbphy *sphy,
-							unsigned long rate);
-extern int samsung_usbphy_rate_to_clksel_4x12(struct samsung_usbphy *sphy,
-							unsigned long rate);

drivers/usb/phy/phy-samsung-usb2.c

···
-/* linux/drivers/usb/phy/phy-samsung-usb2.c
- *
- * Copyright (c) 2012 Samsung Electronics Co., Ltd.
- *              http://www.samsung.com
- *
- * Author: Praveen Paneri <[e-mail]>
- *
- * Samsung USB2.0 PHY transceiver; talks to S3C HS OTG controller, EHCI-S5P and
- * OHCI-EXYNOS controllers.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/usb/otg.h>
-#include <linux/usb/samsung_usb_phy.h>
-#include <linux/platform_data/samsung-usbphy.h>
-
-#include "phy-samsung-usb.h"
-
-static int samsung_usbphy_set_host(struct usb_otg *otg, struct usb_bus *host)
-{
-	if (!otg)
-		return -ENODEV;
-
-	if (!otg->host)
-		otg->host = host;
-
-	return 0;
-}
-
-static bool exynos5_phyhost_is_on(void __iomem *regs)
-{
-	u32 reg;
-
-	reg = readl(regs + EXYNOS5_PHY_HOST_CTRL0);
-
-	return !(reg & HOST_CTRL0_SIDDQ);
-}
-
-static void samsung_exynos5_usb2phy_enable(struct samsung_usbphy *sphy)
-{
-	void __iomem *regs = sphy->regs;
-	u32 phyclk = sphy->ref_clk_freq;
-	u32 phyhost;
-	u32 phyotg;
-	u32 phyhsic;
-	u32 ehcictrl;
-	u32 ohcictrl;
-
-	/*
-	 * phy_usage helps in keeping usage count for phy
-	 * so that the first consumer enabling the phy is also
-	 * the last consumer to disable it.
-	 */
-
-	atomic_inc(&sphy->phy_usage);
-
-	if (exynos5_phyhost_is_on(regs)) {
-		dev_info(sphy->dev, "Already power on PHY\n");
-		return;
-	}
-
-	/* Host configuration */
-	phyhost = readl(regs + EXYNOS5_PHY_HOST_CTRL0);
-
-	/* phy reference clock configuration */
-	phyhost &= ~HOST_CTRL0_FSEL_MASK;
-	phyhost |= HOST_CTRL0_FSEL(phyclk);
-
-	/* host phy reset */
-	phyhost &= ~(HOST_CTRL0_PHYSWRST |
-			HOST_CTRL0_PHYSWRSTALL |
-			HOST_CTRL0_SIDDQ |
-			/* Enable normal mode of operation */
-			HOST_CTRL0_FORCESUSPEND |
-			HOST_CTRL0_FORCESLEEP);
-
-	/* Link reset */
-	phyhost |= (HOST_CTRL0_LINKSWRST |
-			HOST_CTRL0_UTMISWRST |
-			/* COMMON Block configuration during suspend */
-			HOST_CTRL0_COMMONON_N);
-	writel(phyhost, regs + EXYNOS5_PHY_HOST_CTRL0);
-	udelay(10);
-	phyhost &= ~(HOST_CTRL0_LINKSWRST |
-			HOST_CTRL0_UTMISWRST);
-	writel(phyhost, regs + EXYNOS5_PHY_HOST_CTRL0);
-
-	/* OTG configuration */
-	phyotg = readl(regs + EXYNOS5_PHY_OTG_SYS);
-
-	/* phy reference clock configuration */
-	phyotg &= ~OTG_SYS_FSEL_MASK;
-	phyotg |= OTG_SYS_FSEL(phyclk);
-
-	/* Enable normal mode of operation */
-	phyotg &= ~(OTG_SYS_FORCESUSPEND |
-			OTG_SYS_SIDDQ_UOTG |
-			OTG_SYS_FORCESLEEP |
-			OTG_SYS_REFCLKSEL_MASK |
-			/* COMMON Block configuration during suspend */
-			OTG_SYS_COMMON_ON);
-
-	/* OTG phy & link reset */
-	phyotg |= (OTG_SYS_PHY0_SWRST |
-			OTG_SYS_LINKSWRST_UOTG |
-			OTG_SYS_PHYLINK_SWRESET |
-			OTG_SYS_OTGDISABLE |
-			/* Set phy refclk */
-			OTG_SYS_REFCLKSEL_CLKCORE);
-
-	writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
-	udelay(10);
-	phyotg &= ~(OTG_SYS_PHY0_SWRST |
-			OTG_SYS_LINKSWRST_UOTG |
-			OTG_SYS_PHYLINK_SWRESET);
-	writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
-
-	/* HSIC phy configuration */
-	phyhsic = (HSIC_CTRL_REFCLKDIV_12 |
-			HSIC_CTRL_REFCLKSEL |
-			HSIC_CTRL_PHYSWRST);
-	writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL1);
-	writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL2);
-	udelay(10);
-	phyhsic &= ~HSIC_CTRL_PHYSWRST;
-	writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL1);
-	writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL2);
-
-	udelay(80);
-
-	/* enable EHCI DMA burst */
-	ehcictrl = readl(regs + EXYNOS5_PHY_HOST_EHCICTRL);
-	ehcictrl |= (HOST_EHCICTRL_ENAINCRXALIGN |
-				HOST_EHCICTRL_ENAINCR4 |
-				HOST_EHCICTRL_ENAINCR8 |
-				HOST_EHCICTRL_ENAINCR16);
-	writel(ehcictrl, regs + EXYNOS5_PHY_HOST_EHCICTRL);
-
-	/* set ohci_suspend_on_n */
-	ohcictrl = readl(regs + EXYNOS5_PHY_HOST_OHCICTRL);
-	ohcictrl |= HOST_OHCICTRL_SUSPLGCY;
-	writel(ohcictrl, regs + EXYNOS5_PHY_HOST_OHCICTRL);
-}
-
-static void samsung_usb2phy_enable(struct samsung_usbphy *sphy)
-{
-	void __iomem *regs = sphy->regs;
-	u32 phypwr;
-	u32 phyclk;
-	u32 rstcon;
-
-	/* set clock frequency for PLL */
-	phyclk = sphy->ref_clk_freq;
-	phypwr = readl(regs + SAMSUNG_PHYPWR);
-	rstcon = readl(regs + SAMSUNG_RSTCON);
-
-	switch (sphy->drv_data->cpu_type) {
-	case TYPE_S3C64XX:
-		phyclk &= ~PHYCLK_COMMON_ON_N;
-		phypwr &= ~PHYPWR_NORMAL_MASK;
-		rstcon |= RSTCON_SWRST;
-		break;
-	case TYPE_EXYNOS4X12:
-		phypwr &= ~(PHYPWR_NORMAL_MASK_HSIC0 |
-				PHYPWR_NORMAL_MASK_HSIC1 |
-				PHYPWR_NORMAL_MASK_PHY1);
-		rstcon |= RSTCON_HOSTPHY_SWRST;
-	case TYPE_EXYNOS4210:
-		phypwr &= ~PHYPWR_NORMAL_MASK_PHY0;
-		rstcon |= RSTCON_SWRST;
-	default:
-		break;
-	}
-
-	writel(phyclk, regs + SAMSUNG_PHYCLK);
-	/* Configure PHY0 for normal operation*/
-	writel(phypwr, regs + SAMSUNG_PHYPWR);
-	/* reset all ports of PHY and Link */
-	writel(rstcon, regs + SAMSUNG_RSTCON);
-	udelay(10);
-	if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12)
-		rstcon &= ~RSTCON_HOSTPHY_SWRST;
-	rstcon &= ~RSTCON_SWRST;
-	writel(rstcon, regs + SAMSUNG_RSTCON);
-}
-
-static void samsung_exynos5_usb2phy_disable(struct samsung_usbphy *sphy)
-{
-	void __iomem *regs = sphy->regs;
-	u32 phyhost;
-	u32 phyotg;
-	u32 phyhsic;
-
-	if (atomic_dec_return(&sphy->phy_usage) > 0) {
-		dev_info(sphy->dev, "still being used\n");
-		return;
-	}
-
-	phyhsic = (HSIC_CTRL_REFCLKDIV_12 |
-			HSIC_CTRL_REFCLKSEL |
-			HSIC_CTRL_SIDDQ |
-			HSIC_CTRL_FORCESLEEP |
-			HSIC_CTRL_FORCESUSPEND);
-	writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL1);
-	writel(phyhsic, regs + EXYNOS5_PHY_HSIC_CTRL2);
-
-	phyhost = readl(regs + EXYNOS5_PHY_HOST_CTRL0);
-	phyhost |= (HOST_CTRL0_SIDDQ |
-			HOST_CTRL0_FORCESUSPEND |
-			HOST_CTRL0_FORCESLEEP |
-			HOST_CTRL0_PHYSWRST |
-			HOST_CTRL0_PHYSWRSTALL);
-	writel(phyhost, regs + EXYNOS5_PHY_HOST_CTRL0);
-
-	phyotg = readl(regs + EXYNOS5_PHY_OTG_SYS);
-	phyotg |= (OTG_SYS_FORCESUSPEND |
-			OTG_SYS_SIDDQ_UOTG |
-			OTG_SYS_FORCESLEEP);
-	writel(phyotg, regs + EXYNOS5_PHY_OTG_SYS);
-}
-
-static void samsung_usb2phy_disable(struct samsung_usbphy *sphy)
-{
-	void __iomem *regs = sphy->regs;
-	u32 phypwr;
-
-	phypwr = readl(regs + SAMSUNG_PHYPWR);
-
-	switch (sphy->drv_data->cpu_type) {
-	case TYPE_S3C64XX:
-		phypwr |= PHYPWR_NORMAL_MASK;
-		break;
-	case TYPE_EXYNOS4X12:
-		phypwr |= (PHYPWR_NORMAL_MASK_HSIC0 |
-				PHYPWR_NORMAL_MASK_HSIC1 |
-				PHYPWR_NORMAL_MASK_PHY1);
-	case TYPE_EXYNOS4210:
-		phypwr |= PHYPWR_NORMAL_MASK_PHY0;
-	default:
-		break;
-	}
-
-	/* Disable analog and otg block power */
-	writel(phypwr, regs + SAMSUNG_PHYPWR);
-}
-
-/*
- * The function passed to the usb driver for phy initialization
- */
-static int samsung_usb2phy_init(struct usb_phy *phy)
-{
-	struct samsung_usbphy *sphy;
-	struct usb_bus *host = NULL;
-	unsigned long flags;
-	int ret = 0;
-
-	sphy = phy_to_sphy(phy);
-
-	host = phy->otg->host;
-
-	/* Enable the phy clock */
-	ret = clk_prepare_enable(sphy->clk);
-	if (ret) {
-		dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
-		return ret;
-	}
-
-	spin_lock_irqsave(&sphy->lock, flags);
-
-	if (host) {
-		/* setting default phy-type for USB 2.0 */
-		if (!strstr(dev_name(host->controller), "ehci") ||
-				!strstr(dev_name(host->controller), "ohci"))
-			samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_HOST);
-	} else {
-		samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
-	}
-
-	/* Disable phy isolation */
-	if (sphy->plat && sphy->plat->pmu_isolation)
-		sphy->plat->pmu_isolation(false);
-	else if (sphy->drv_data->set_isolation)
-		sphy->drv_data->set_isolation(sphy, false);
-
-	/* Selecting Host/OTG mode; After reset USB2.0PHY_CFG: HOST */
-	samsung_usbphy_cfg_sel(sphy);
-
-	/* Initialize usb phy registers */
-	sphy->drv_data->phy_enable(sphy);
-
-	spin_unlock_irqrestore(&sphy->lock, flags);
-
-	/* Disable the phy clock */
-	clk_disable_unprepare(sphy->clk);
-
-	return ret;
-}
-
-/*
- * The function passed to the usb driver for phy shutdown
- */
-static void samsung_usb2phy_shutdown(struct usb_phy *phy)
-{
-	struct samsung_usbphy *sphy;
-	struct usb_bus *host = NULL;
-	unsigned long flags;
-
-	sphy = phy_to_sphy(phy);
-
-	host = phy->otg->host;
-
-	if (clk_prepare_enable(sphy->clk)) {
-		dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
-		return;
-	}
-
-	spin_lock_irqsave(&sphy->lock, flags);
-
-	if (host) {
-		/* setting default phy-type for USB 2.0 */
-		if (!strstr(dev_name(host->controller), "ehci") ||
-				!strstr(dev_name(host->controller), "ohci"))
-			samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_HOST);
-	} else {
-		samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
-	}
-
-	/* De-initialize usb phy registers */
-	sphy->drv_data->phy_disable(sphy);
-
-	/* Enable phy isolation */
-	if (sphy->plat && sphy->plat->pmu_isolation)
-		sphy->plat->pmu_isolation(true);
-	else if (sphy->drv_data->set_isolation)
-		sphy->drv_data->set_isolation(sphy, true);
-
-	spin_unlock_irqrestore(&sphy->lock, flags);
-
-	clk_disable_unprepare(sphy->clk);
-}
-
-static int samsung_usb2phy_probe(struct platform_device *pdev)
-{
-	struct samsung_usbphy *sphy;
-	struct usb_otg *otg;
-	struct samsung_usbphy_data *pdata = dev_get_platdata(&pdev->dev);
-	const struct samsung_usbphy_drvdata *drv_data;
-	struct device *dev = &pdev->dev;
-	struct resource *phy_mem;
-	void __iomem	*phy_base;
-	struct clk *clk;
-	int ret;
-
-	phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	phy_base = devm_ioremap_resource(dev, phy_mem);
-	if (IS_ERR(phy_base))
-		return PTR_ERR(phy_base);
-
-	sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL);
-	if (!sphy)
-		return -ENOMEM;
-
-	otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
-	if (!otg)
-		return -ENOMEM;
-
-	drv_data = samsung_usbphy_get_driver_data(pdev);
-
-	if (drv_data->cpu_type == TYPE_EXYNOS5250)
-		clk = devm_clk_get(dev, "usbhost");
-	else
-		clk = devm_clk_get(dev, "otg");
-
-	if (IS_ERR(clk)) {
-		dev_err(dev, "Failed to get usbhost/otg clock\n");
-		return PTR_ERR(clk);
-	}
-
-	sphy->dev = dev;
-
-	if (dev->of_node) {
-		ret = samsung_usbphy_parse_dt(sphy);
-		if (ret < 0)
-			return ret;
-	} else {
-		if (!pdata) {
-			dev_err(dev, "no platform data specified\n");
-			return -EINVAL;
-		}
-	}
-
-	sphy->plat		= pdata;
-	sphy->regs		= phy_base;
-	sphy->clk		= clk;
-	sphy->drv_data		= drv_data;
-	sphy->phy.dev		= sphy->dev;
-	sphy->phy.label		= "samsung-usb2phy";
-	sphy->phy.type		= USB_PHY_TYPE_USB2;
-	sphy->phy.init		= samsung_usb2phy_init;
-	sphy->phy.shutdown	= samsung_usb2phy_shutdown;
-
-	sphy->ref_clk_freq = samsung_usbphy_get_refclk_freq(sphy);
-	if (sphy->ref_clk_freq < 0)
-		return -EINVAL;
-
-	sphy->phy.otg		= otg;
-	sphy->phy.otg->phy	= &sphy->phy;
-	sphy->phy.otg->set_host = samsung_usbphy_set_host;
-
-	spin_lock_init(&sphy->lock);
-
-	platform_set_drvdata(pdev, sphy);
-
-	return usb_add_phy_dev(&sphy->phy);
-}
-
-static int samsung_usb2phy_remove(struct platform_device *pdev)
-{
-	struct samsung_usbphy *sphy = platform_get_drvdata(pdev);
-
-	usb_remove_phy(&sphy->phy);
-
-	if (sphy->pmuregs)
-		iounmap(sphy->pmuregs);
-	if (sphy->sysreg)
-		iounmap(sphy->sysreg);
-
-	return 0;
-}
-
-static const struct samsung_usbphy_drvdata usb2phy_s3c64xx = {
-	.cpu_type		= TYPE_S3C64XX,
-	.devphy_en_mask		= S3C64XX_USBPHY_ENABLE,
-	.rate_to_clksel		= samsung_usbphy_rate_to_clksel_64xx,
-	.set_isolation		= NULL, /* TODO */
-	.phy_enable		= samsung_usb2phy_enable,
-	.phy_disable		= samsung_usb2phy_disable,
-};
-
-static const struct samsung_usbphy_drvdata usb2phy_exynos4 = {
-	.cpu_type		= TYPE_EXYNOS4210,
-	.devphy_en_mask		= EXYNOS_USBPHY_ENABLE,
-	.hostphy_en_mask	= EXYNOS_USBPHY_ENABLE,
-	.rate_to_clksel		= samsung_usbphy_rate_to_clksel_64xx,
-	.set_isolation		= samsung_usbphy_set_isolation_4210,
-	.phy_enable		= samsung_usb2phy_enable,
-	.phy_disable		= samsung_usb2phy_disable,
-};
-
-static const struct samsung_usbphy_drvdata usb2phy_exynos4x12 = {
-	.cpu_type		= TYPE_EXYNOS4X12,
-	.devphy_en_mask		= EXYNOS_USBPHY_ENABLE,
-	.hostphy_en_mask	= EXYNOS_USBPHY_ENABLE,
-	.rate_to_clksel		= samsung_usbphy_rate_to_clksel_4x12,
-	.set_isolation		= samsung_usbphy_set_isolation_4210,
-	.phy_enable		= samsung_usb2phy_enable,
-	.phy_disable		= samsung_usb2phy_disable,
-};
-
-static struct samsung_usbphy_drvdata usb2phy_exynos5 = {
-	.cpu_type		= TYPE_EXYNOS5250,
-	.hostphy_en_mask	= EXYNOS_USBPHY_ENABLE,
-	.hostphy_reg_offset	= EXYNOS_USBHOST_PHY_CTRL_OFFSET,
-	.rate_to_clksel		= samsung_usbphy_rate_to_clksel_4x12,
-	.set_isolation		= samsung_usbphy_set_isolation_4210,
-	.phy_enable		= samsung_exynos5_usb2phy_enable,
-	.phy_disable		= samsung_exynos5_usb2phy_disable,
-};
-
-#ifdef CONFIG_OF
-static const struct of_device_id samsung_usbphy_dt_match[] = {
-	{
-		.compatible = "samsung,s3c64xx-usb2phy",
-		.data = &usb2phy_s3c64xx,
-	}, {
-		.compatible = "samsung,exynos4210-usb2phy",
-		.data = &usb2phy_exynos4,
-	}, {
-		.compatible = "samsung,exynos4x12-usb2phy",
-		.data = &usb2phy_exynos4x12,
-	}, {
-		.compatible = "samsung,exynos5250-usb2phy",
-		.data = &usb2phy_exynos5
-	},
-	{},
-};
-MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
-#endif
-
-static struct platform_device_id samsung_usbphy_driver_ids[] = {
-	{
-		.name		= "s3c64xx-usb2phy",
-		.driver_data	= (unsigned long)&usb2phy_s3c64xx,
-	}, {
-		.name		= "exynos4210-usb2phy",
-		.driver_data	= (unsigned long)&usb2phy_exynos4,
-	}, {
-		.name		= "exynos4x12-usb2phy",
-		.driver_data	= (unsigned long)&usb2phy_exynos4x12,
-	}, {
-		.name		= "exynos5250-usb2phy",
-		.driver_data	= (unsigned long)&usb2phy_exynos5,
-	},
-	{},
-};
-
-MODULE_DEVICE_TABLE(platform, samsung_usbphy_driver_ids);
-
-static struct platform_driver samsung_usb2phy_driver = {
-	.probe		= samsung_usb2phy_probe,
-	.remove		= samsung_usb2phy_remove,
-	.id_table	= samsung_usbphy_driver_ids,
-	.driver		= {
-		.name	= "samsung-usb2phy",
-		.owner	= THIS_MODULE,
-		.of_match_table = of_match_ptr(samsung_usbphy_dt_match),
-	},
-};
-
-module_platform_driver(samsung_usb2phy_driver);
-
-MODULE_DESCRIPTION("Samsung USB 2.0 phy controller");
-MODULE_AUTHOR("Praveen Paneri <[e-mail]>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:samsung-usb2phy");

drivers/usb/phy/phy-samsung-usb3.c

···
-/* linux/drivers/usb/phy/phy-samsung-usb3.c
- *
- * Copyright (c) 2013 Samsung Electronics Co., Ltd.
- *              http://www.samsung.com
- *
- * Author: Vivek Gautam <[e-mail]>
- *
- * Samsung USB 3.0 PHY transceiver; talks to DWC3 controller.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/usb/samsung_usb_phy.h>
-#include <linux/platform_data/samsung-usbphy.h>
-
-#include "phy-samsung-usb.h"
-
-/*
- * Sets the phy clk as EXTREFCLK (XXTI) which is internal clock from clock core.
- */
-static u32 samsung_usb3phy_set_refclk(struct samsung_usbphy *sphy)
-{
-	u32 reg;
-	u32 refclk;
-
-	refclk = sphy->ref_clk_freq;
-
-	reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
-		PHYCLKRST_FSEL(refclk);
-
-	switch (refclk) {
-	case FSEL_CLKSEL_50M:
-		reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF |
-			PHYCLKRST_SSC_REFCLKSEL(0x00));
-		break;
-	case FSEL_CLKSEL_20M:
-		reg |= (PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF |
-			PHYCLKRST_SSC_REFCLKSEL(0x00));
-		break;
-	case FSEL_CLKSEL_19200K:
-		reg |= (PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF |
-			PHYCLKRST_SSC_REFCLKSEL(0x88));
-		break;
-	case FSEL_CLKSEL_24M:
-	default:
-		reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
-			PHYCLKRST_SSC_REFCLKSEL(0x88));
-		break;
-	}
-
-	return reg;
-}
-
-static void samsung_exynos5_usb3phy_enable(struct samsung_usbphy *sphy)
-{
-	void __iomem *regs = sphy->regs;
-	u32 phyparam0;
-	u32 phyparam1;
-	u32 linksystem;
-	u32 phybatchg;
-	u32 phytest;
-	u32 phyclkrst;
-
-	/* Reset USB 3.0 PHY */
-	writel(0x0, regs + EXYNOS5_DRD_PHYREG0);
-
-	phyparam0 = readl(regs + EXYNOS5_DRD_PHYPARAM0);
-	/* Select PHY CLK source */
-	phyparam0 &= ~PHYPARAM0_REF_USE_PAD;
-	/* Set Loss-of-Signal Detector sensitivity */
-	phyparam0 &= ~PHYPARAM0_REF_LOSLEVEL_MASK;
-	phyparam0 |= PHYPARAM0_REF_LOSLEVEL;
-	writel(phyparam0, regs + EXYNOS5_DRD_PHYPARAM0);
-
-	writel(0x0, regs + EXYNOS5_DRD_PHYRESUME);
-
-	/*
-	 * Setting the Frame length Adj value[6:1] to default 0x20
-	 * See xHCI 1.0 spec, 5.2.4
-	 */
-	linksystem = LINKSYSTEM_XHCI_VERSION_CONTROL |
-			LINKSYSTEM_FLADJ(0x20);
-	writel(linksystem, regs + EXYNOS5_DRD_LINKSYSTEM);
-
-	phyparam1 = readl(regs + EXYNOS5_DRD_PHYPARAM1);
-	/* Set Tx De-Emphasis level */
-	phyparam1 &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
-	phyparam1 |= PHYPARAM1_PCS_TXDEEMPH;
-	writel(phyparam1, regs + EXYNOS5_DRD_PHYPARAM1);
-
-	phybatchg = readl(regs + EXYNOS5_DRD_PHYBATCHG);
-	phybatchg |= PHYBATCHG_UTMI_CLKSEL;
-	writel(phybatchg, regs + EXYNOS5_DRD_PHYBATCHG);
-
-	/* PHYTEST POWERDOWN Control */
-	phytest = readl(regs + EXYNOS5_DRD_PHYTEST);
-	phytest &= ~(PHYTEST_POWERDOWN_SSP |
-			PHYTEST_POWERDOWN_HSP);
-	writel(phytest, regs + EXYNOS5_DRD_PHYTEST);
-
-	/* UTMI Power Control */
-	writel(PHYUTMI_OTGDISABLE, regs + EXYNOS5_DRD_PHYUTMI);
-
-	phyclkrst = samsung_usb3phy_set_refclk(sphy);
-
-	phyclkrst |= PHYCLKRST_PORTRESET |
-			/* Digital power supply in normal operating mode */
-			PHYCLKRST_RETENABLEN |
-			/* Enable ref clock for SS function */
-			PHYCLKRST_REF_SSP_EN |
-			/* Enable spread spectrum */
-			PHYCLKRST_SSC_EN |
-			/* Power down HS Bias and PLL blocks in suspend mode */
-			PHYCLKRST_COMMONONN;
-
-	writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
-
-	udelay(10);
-
-	phyclkrst &= ~(PHYCLKRST_PORTRESET);
-	writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
-}
-
-static void samsung_exynos5_usb3phy_disable(struct samsung_usbphy *sphy)
-{
-	u32 phyutmi;
-	u32 phyclkrst;
-	u32 phytest;
-	void __iomem *regs = sphy->regs;
-
-	phyutmi = PHYUTMI_OTGDISABLE |
-			PHYUTMI_FORCESUSPEND |
-			PHYUTMI_FORCESLEEP;
-	writel(phyutmi, regs + EXYNOS5_DRD_PHYUTMI);
-
-	/* Resetting the PHYCLKRST enable bits to reduce leakage current */
-	phyclkrst = readl(regs + EXYNOS5_DRD_PHYCLKRST);
-	phyclkrst &= ~(PHYCLKRST_REF_SSP_EN |
-			PHYCLKRST_SSC_EN |
-			PHYCLKRST_COMMONONN);
-	writel(phyclkrst, regs + EXYNOS5_DRD_PHYCLKRST);
-
-	/* Control PHYTEST to remove leakage current */
-	phytest = readl(regs + EXYNOS5_DRD_PHYTEST);
-	phytest |= (PHYTEST_POWERDOWN_SSP |
-			PHYTEST_POWERDOWN_HSP);
-	writel(phytest, regs + EXYNOS5_DRD_PHYTEST);
-}
-
-static int samsung_usb3phy_init(struct usb_phy *phy)
-{
-	struct samsung_usbphy *sphy;
-	unsigned long flags;
-	int ret = 0;
-
-	sphy = phy_to_sphy(phy);
-
-	/* Enable the phy clock */
-	ret = clk_prepare_enable(sphy->clk);
-	if (ret) {
-		dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
-		return ret;
-	}
-
-	spin_lock_irqsave(&sphy->lock, flags);
-
-	/* setting default phy-type for USB 3.0 */
-	samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
-
-	/* Disable phy isolation */
-	if (sphy->drv_data->set_isolation)
-		sphy->drv_data->set_isolation(sphy, false);
-
-	/* Initialize usb phy registers */
-	sphy->drv_data->phy_enable(sphy);
-
-	spin_unlock_irqrestore(&sphy->lock, flags);
-
-	/* Disable the phy clock */
-	clk_disable_unprepare(sphy->clk);
-
-	return ret;
-}
-
-/*
- * The function passed to the usb driver for phy shutdown
- */
-static void samsung_usb3phy_shutdown(struct usb_phy *phy)
-{
-	struct samsung_usbphy *sphy;
-	unsigned long flags;
-
-	sphy = phy_to_sphy(phy);
-
-	if (clk_prepare_enable(sphy->clk)) {
-		dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
-		return;
-	}
-
-	spin_lock_irqsave(&sphy->lock, flags);
-
-	/* setting default phy-type for USB 3.0 */
-	samsung_usbphy_set_type(&sphy->phy, USB_PHY_TYPE_DEVICE);
-
-	/* De-initialize usb phy registers */
-	sphy->drv_data->phy_disable(sphy);
-
-	/* Enable phy isolation */
-	if (sphy->drv_data->set_isolation)
-		sphy->drv_data->set_isolation(sphy, true);
-
-	spin_unlock_irqrestore(&sphy->lock, flags);
-
-	clk_disable_unprepare(sphy->clk);
-}
-
-static int samsung_usb3phy_probe(struct platform_device *pdev)
-{
-	struct samsung_usbphy *sphy;
-	struct samsung_usbphy_data *pdata = dev_get_platdata(&pdev->dev);
-	struct device *dev = &pdev->dev;
-	struct resource *phy_mem;
-	void __iomem	*phy_base;
-	struct clk *clk;
-	int ret;
-
-	phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	phy_base = devm_ioremap_resource(dev, phy_mem);
-	if (IS_ERR(phy_base))
-		return PTR_ERR(phy_base);
-
-	sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL);
-	if (!sphy)
-		return -ENOMEM;
-
-	clk = devm_clk_get(dev, "usbdrd30");
-	if (IS_ERR(clk)) {
-		dev_err(dev, "Failed to get device clock\n");
-		return PTR_ERR(clk);
-	}
-
-	sphy->dev = dev;
-
-	if (dev->of_node) {
-		ret = samsung_usbphy_parse_dt(sphy);
-		if (ret < 0)
-			return ret;
-	} else {
-		if (!pdata) {
-			dev_err(dev, "no platform data specified\n");
-			return -EINVAL;
-		}
-	}
-
-	sphy->plat		= pdata;
-	sphy->regs		= phy_base;
-	sphy->clk		= clk;
-	sphy->phy.dev		= sphy->dev;
-	sphy->phy.label		= "samsung-usb3phy";
-	sphy->phy.type		= USB_PHY_TYPE_USB3;
-	sphy->phy.init		= samsung_usb3phy_init;
-	sphy->phy.shutdown	= samsung_usb3phy_shutdown;
-	sphy->drv_data		= samsung_usbphy_get_driver_data(pdev);
-
-	sphy->ref_clk_freq = samsung_usbphy_get_refclk_freq(sphy);
-	if (sphy->ref_clk_freq < 0)
-		return -EINVAL;
-
-	spin_lock_init(&sphy->lock);
-
-	platform_set_drvdata(pdev, sphy);
-
-	return usb_add_phy_dev(&sphy->phy);
-}
-
-static int samsung_usb3phy_remove(struct platform_device *pdev)
-{
-	struct samsung_usbphy *sphy = platform_get_drvdata(pdev);
-
-	usb_remove_phy(&sphy->phy);
-
-	if (sphy->pmuregs)
-		iounmap(sphy->pmuregs);
-	if (sphy->sysreg)
-		iounmap(sphy->sysreg);
-
-	return 0;
-}
-
-static struct samsung_usbphy_drvdata usb3phy_exynos5 = {
-	.cpu_type		= TYPE_EXYNOS5250,
-	.devphy_en_mask		= EXYNOS_USBPHY_ENABLE,
-	.rate_to_clksel		= samsung_usbphy_rate_to_clksel_4x12,
-	.set_isolation		= samsung_usbphy_set_isolation_4210,
-	.phy_enable		= samsung_exynos5_usb3phy_enable,
-	.phy_disable		= samsung_exynos5_usb3phy_disable,
-};
-
-#ifdef CONFIG_OF
-static const struct of_device_id samsung_usbphy_dt_match[] = {
-	{
-		.compatible = "samsung,exynos5250-usb3phy",
-		.data = &usb3phy_exynos5
-	},
-	{},
-};
-MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
-#endif
-
-static struct platform_device_id samsung_usbphy_driver_ids[] = {
-	{
-		.name		= "exynos5250-usb3phy",
-		.driver_data	= (unsigned long)&usb3phy_exynos5,
-	},
-	{},
-};
-
-MODULE_DEVICE_TABLE(platform, samsung_usbphy_driver_ids);
-
-static struct platform_driver samsung_usb3phy_driver = {
-	.probe		= samsung_usb3phy_probe,
-	.remove		= samsung_usb3phy_remove,
-	.id_table	= samsung_usbphy_driver_ids,
-	.driver		= {
-		.name	= "samsung-usb3phy",
-		.owner	= THIS_MODULE,
-		.of_match_table = of_match_ptr(samsung_usbphy_dt_match),
-	},
-};
-
-module_platform_driver(samsung_usb3phy_driver);
-
-MODULE_DESCRIPTION("Samsung USB 3.0 phy controller");
-MODULE_AUTHOR("Vivek Gautam <[e-mail]>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:samsung-usb3phy");

drivers/usb/phy/phy-twl6030-usb.c

···
 	int			irq2;
 	enum omap_musb_vbus_id_status linkstat;
 	u8			asleep;
-	bool			irq_enabled;
 	bool			vbus_enable;
 	const char		*regulator;
 };
···
 
 	INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
 
-	twl->irq_enabled = true;
 	status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
 			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 			"twl6030_usb", twl);

drivers/usb/renesas_usbhs/common.c

···
 #include <linux/gpio.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
···
 /*
  *		platform functions
  */
+static const struct of_device_id usbhs_of_match[] = {
+	{
+		.compatible = "renesas,usbhs-r8a7790",
+		.data = (void *)USBHS_TYPE_R8A7790,
+	},
+	{
+		.compatible = "renesas,usbhs-r8a7791",
+		.data = (void *)USBHS_TYPE_R8A7791,
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, usbhs_of_match);
+
+static struct renesas_usbhs_platform_info *usbhs_parse_dt(struct device *dev)
+{
+	struct renesas_usbhs_platform_info *info;
+	struct renesas_usbhs_driver_param *dparam;
+	const struct of_device_id *of_id = of_match_device(usbhs_of_match, dev);
+	u32 tmp;
+	int gpio;
+
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return NULL;
+
+	dparam = &info->driver_param;
+	dparam->type = of_id ? (u32)of_id->data : 0;
+	if (!of_property_read_u32(dev->of_node, "renesas,buswait", &tmp))
+		dparam->buswait_bwait = tmp;
+	gpio = of_get_named_gpio_flags(dev->of_node, "renesas,enable-gpio", 0,
+				       NULL);
+	if (gpio > 0)
+		dparam->enable_gpio = gpio;
+
+	return info;
+}
+
 static int usbhs_probe(struct platform_device *pdev)
 {
 	struct renesas_usbhs_platform_info *info = dev_get_platdata(&pdev->dev);
···
 	struct usbhs_priv *priv;
 	struct resource *res, *irq_res;
 	int ret;
+
+	/* check device node */
+	if (pdev->dev.of_node)
+		info = pdev->dev.platform_data = usbhs_parse_dt(&pdev->dev);
 
 	/* check platform information */
 	if (!info) {
···
 	.driver		= {
 		.name	= "renesas_usbhs",
 		.pm	= &usbhsc_pm_ops,
+		.of_match_table = of_match_ptr(usbhs_of_match),
 	},
 	.probe		= usbhs_probe,
 	.remove		= usbhs_remove,

include/linux/platform_data/samsung-usbphy.h

···
-/*
- * Copyright (C) 2012 Samsung Electronics Co.Ltd
- *		http://www.samsung.com/
- * Author: Praveen Paneri <[e-mail]>
- *
- * Defines platform data for samsung usb phy driver.
- *
- * This program is free software; you can redistribute  it and/or modify it
- * under  the terms of  the GNU General  Public License as published by the
- * Free Software Foundation;  either version 2 of the  License, or (at your
- * option) any later version.
- */
-
-#ifndef __SAMSUNG_USBPHY_PLATFORM_H
-#define __SAMSUNG_USBPHY_PLATFORM_H
-
-/**
- * samsung_usbphy_data - Platform data for USB PHY driver.
- * @pmu_isolation: Function to control usb phy isolation in PMU.
- */
-struct samsung_usbphy_data {
-	void (*pmu_isolation)(int on);
-};
-
-extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd);
-
-#endif /* __SAMSUNG_USBPHY_PLATFORM_H */

include/linux/usb/gadget.h

···
  * @ep:the endpoint associated with the request
  * @req:the request being canceled
  *
- * if the request is still active on the endpoint, it is dequeued and its
+ * If the request is still active on the endpoint, it is dequeued and its
  * completion routine is called (with status -ECONNRESET); else a negative
- * error code is returned.
+ * error code is returned. This is guaranteed to happen before the call to
+ * usb_ep_dequeue() returns.
  *
- * note that some hardware can't clear out write fifos (to unlink the request
- * at the head of the queue) except as part of disconnecting from usb.  such
+ * Note that some hardware can't clear out write fifos (to unlink the request
+ * at the head of the queue) except as part of disconnecting from usb. Such
  * restrictions prevent drivers from supporting configuration changes,
  * even to configuration zero (a "chapter 9" requirement).
  */
···
  *	Called in a context that permits sleeping.
  * @suspend: Invoked on USB suspend.  May be called in_interrupt.
  * @resume: Invoked on USB resume.  May be called in_interrupt.
+ * @reset: Invoked on USB bus reset. It is mandatory for all gadget drivers
+ *	and should be called in_interrupt.
  * @driver: Driver model state for this driver.
  *
  * Devices are disabled till a gadget driver successfully bind()s, which
···
 	void			(*disconnect)(struct usb_gadget *);
 	void			(*suspend)(struct usb_gadget *);
 	void			(*resume)(struct usb_gadget *);
+	void			(*reset)(struct usb_gadget *);
 
 	/* FIXME support safe rmmod */
 	struct device_driver	driver;
···
 
 extern void usb_gadget_set_state(struct usb_gadget *gadget,
 		enum usb_device_state state);
+
+/*-------------------------------------------------------------------------*/
+
+/* utility to tell udc core that the bus reset occurs */
+extern void usb_gadget_udc_reset(struct usb_gadget *gadget,
+		struct usb_gadget_driver *driver);
 
 /*-------------------------------------------------------------------------*/
 

include/uapi/linux/usb/functionfs.h

···
 	FUNCTIONFS_HAS_HS_DESC = 2,
 	FUNCTIONFS_HAS_SS_DESC = 4,
 	FUNCTIONFS_HAS_MS_OS_DESC = 8,
+	FUNCTIONFS_VIRTUAL_ADDR = 16,
 };
 
 /* Descriptor of an non-audio endpoint */
···
 	__u8  bmAttributes;
 	__le16 wMaxPacketSize;
 	__u8  bInterval;
+} __attribute__((packed));
+
+struct usb_functionfs_descs_head_v2 {
+	__le32 magic;
+	__le32 length;
+	__le32 flags;
+	/*
+	 * __le32 fs_count, hs_count, fs_count; must be included manually in
+	 * the structure taking flags into consideration.
+	 */
 } __attribute__((packed));
 
 /* Legacy format, deprecated as of 3.14. */
···
  * structure.  Any flags that are not recognised cause the whole block to be
  * rejected with -ENOSYS.
  *
- * Legacy descriptors format:
+ * Legacy descriptors format (deprecated as of 3.14):
  *
  * | off | name      | type         | description                          |
  * |-----+-----------+--------------+--------------------------------------|
···
  * active returns -ENODEV.
  */
 #define	FUNCTIONFS_ENDPOINT_REVMAP	_IO('g', 129)
+
+/*
+ * Returns endpoint descriptor. If function is not active returns -ENODEV.
+ */
+#define	FUNCTIONFS_ENDPOINT_DESC	_IOR('g', 130, \
+					     struct usb_endpoint_descriptor)
 
 
 

tools/usb/ffs-test.c

···
 /*
- * ffs-test.c.c -- user mode filesystem api for usb composite function
+ * ffs-test.c -- user mode filesystem api for usb composite function
  *
  * Copyright (C) 2010 Samsung Electronics
  *                    Author: Michal Nazarewicz <[e-mail]>
···
 #include <fcntl.h>
 #include <pthread.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
···
 /******************** Descriptors and Strings *******************************/
 
 static const struct {
-	struct usb_functionfs_descs_head header;
+	struct usb_functionfs_descs_head_v2 header;
+	__le32 fs_count;
+	__le32 hs_count;
 	struct {
 		struct usb_interface_descriptor intf;
 		struct usb_endpoint_descriptor_no_audio sink;
···
 	} __attribute__((packed)) fs_descs, hs_descs;
 } __attribute__((packed)) descriptors = {
 	.header = {
-		.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC),
+		.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
+		.flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC |
+				     FUNCTIONFS_HAS_HS_DESC),
 		.length = cpu_to_le32(sizeof descriptors),
-		.fs_count = cpu_to_le32(3),
-		.hs_count = cpu_to_le32(3),
 	},
+	.fs_count = cpu_to_le32(3),
 	.fs_descs = {
 		.intf = {
 			.bLength = sizeof descriptors.fs_descs.intf,
···
 			/* .wMaxPacketSize = autoconfiguration (kernel) */
 		},
 	},
+	.hs_count = cpu_to_le32(3),
 	.hs_descs = {
 		.intf = {
 			.bLength = sizeof descriptors.fs_descs.intf,
···
 		},
 	},
 };
+
+static size_t descs_to_legacy(void **legacy, const void *descriptors_v2)
+{
+	const unsigned char *descs_end, *descs_start;
+	__u32 length, fs_count = 0, hs_count = 0, count;
+
+	/* Read v2 header */
+	{
+		const struct {
+			const struct usb_functionfs_descs_head_v2 header;
+			const __le32 counts[];
+		} __attribute__((packed)) *const in = descriptors_v2;
+		const __le32 *counts = in->counts;
+		__u32 flags;
+
+		if (le32_to_cpu(in->header.magic) !=
+		    FUNCTIONFS_DESCRIPTORS_MAGIC_V2)
+			return 0;
+		length = le32_to_cpu(in->header.length);
+		if (length <= sizeof in->header)
+			return 0;
+		length -= sizeof in->header;
+		flags = le32_to_cpu(in->header.flags);
+		if (flags & ~(FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
+			      FUNCTIONFS_HAS_SS_DESC))
+			return 0;
+
+#define GET_NEXT_COUNT_IF_FLAG(ret, flg) do {		\
+			if (!(flags & (flg)))		\
+				break;			\
+			if (length < 4)			\
+				return 0;		\
+			ret = le32_to_cpu(*counts);	\
+			length -= 4;			\
+			++counts;			\
+		} while (0)
+
+		GET_NEXT_COUNT_IF_FLAG(fs_count, FUNCTIONFS_HAS_FS_DESC);
+		GET_NEXT_COUNT_IF_FLAG(hs_count, FUNCTIONFS_HAS_HS_DESC);
+		GET_NEXT_COUNT_IF_FLAG(count, FUNCTIONFS_HAS_SS_DESC);
+
+		count = fs_count + hs_count;
+		if (!count)
+			return 0;
+		descs_start = (const void *)counts;
+
+#undef GET_NEXT_COUNT_IF_FLAG
+	}
+
+	/*
+	 * Find the end of FS and HS USB descriptors.  SS descriptors
+	 * are ignored since legacy format does not support them.
+	 */
+	descs_end = descs_start;
+	do {
+		if (length < *descs_end)
+			return 0;
+		length -= *descs_end;
+		descs_end += *descs_end;
+	} while (--count);
+
+	/* Allocate legacy descriptors and copy the data. */
+	{
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+		struct {
+			struct usb_functionfs_descs_head header;
+			__u8 descriptors[];
+		} __attribute__((packed)) *out;
+#pragma GCC diagnostic pop
+
+		length = sizeof out->header + (descs_end - descs_start);
+		out = malloc(length);
+		out->header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC);
+		out->header.length = cpu_to_le32(length);
+		out->header.fs_count = cpu_to_le32(fs_count);
+		out->header.hs_count = cpu_to_le32(hs_count);
+		memcpy(out->descriptors, descs_start, descs_end - descs_start);
+		*legacy = out;
+	}
+
+	return length;
+}
 
 
 #define STR_INTERFACE_ "Source/Sink"
···
 	return nbytes;
 }
 
-static void ep0_init(struct thread *t)
+static void ep0_init(struct thread *t, bool legacy_descriptors)
 {
+	void *legacy;
 	ssize_t ret;
+	size_t len;
 
-	info("%s: writing descriptors\n", t->filename);
+	if (legacy_descriptors) {
+		info("%s: writing descriptors\n", t->filename);
+		goto legacy;
+	}
+
+	info("%s: writing descriptors (in v2 format)\n", t->filename);
 	ret = write(t->fd, &descriptors, sizeof descriptors);
+
+	if (ret < 0 && errno == EINVAL) {
+		warn("%s: new format rejected, trying legacy\n", t->filename);
+legacy:
+		len = descs_to_legacy(&legacy, &descriptors);
+		if (len) {
+			ret = write(t->fd, legacy, len);
+			free(legacy);
+		}
+	}
 	die_on(ret < 0, "%s: write: descriptors", t->filename);
 
 	info("%s: writing strings\n", t->filename);
···
 
 /******************** Main **************************************************/
 
-int main(void)
+int main(int argc, char **argv)
 {
+	bool legacy_descriptors;
 	unsigned i;
 
-	/* XXX TODO: Argument parsing missing */
+	legacy_descriptors = argc > 2 && !strcmp(argv[1], "-l");
 
 	init_thread(threads);
-	ep0_init(threads);
+	ep0_init(threads, legacy_descriptors);
 
 	for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 		init_thread(threads + i);