Merge tag 'usb-for-v3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next

Felipe writes:

usb: patches for v3.16 merge window

Not a lot here during this merge window. Mostly we just have
the usual miscellaneous patches (removal of unnecessary prints,
proper dependencies being added to Kconfig, build warning fixes,
new device ID, etc.

Other than those, the only important new features are the
new support for OS Strings which should help Linux Gadget
Drivers behave better under MS Windows. Also Babble Recovery
implementation for MUSB on AM335x. Lastly, we also have
ARCH_QCOM PHY support though phy-msm.

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

Conflicts:
drivers/usb/phy/phy-mv-u3d-usb.c

Documentation/ABI/testing/configfs-usb-gadget

···
 Description:
 		This group contains functions available to this USB gadget.
 
+What:		/config/usb-gadget/gadget/functions/<func>.<inst>/interface.<n>
+Date:		May 2014
+KernelVersion:	3.16
+Description:
+		This group contains "Feature Descriptors" specific for one
+		gadget's USB interface or one interface group described
+		by an IAD.
+
+		The attributes:
+
+		compatible_id		- 8-byte string for "Compatible ID"
+		sub_compatible_id	- 8-byte string for "Sub Compatible ID"
+
+What:		/config/usb-gadget/gadget/functions/<func>.<inst>/interface.<n>/<property>
+Date:		May 2014
+KernelVersion:	3.16
+Description:
+		This group contains "Extended Property Descriptors" specific for one
+		gadget's USB interface or one interface group described
+		by an IAD.
+
+		The attributes:
+
+		type		- value 1..7 for interpreting the data
+				1: unicode string
+				2: unicode string with environment variable
+				3: binary
+				4: little-endian 32-bit
+				5: big-endian 32-bit
+				6: unicode string with a symbolic link
+				7: multiple unicode strings
+		data		- blob of data to be interpreted depending on
+				type
+
 What:		/config/usb-gadget/gadget/strings
 Date:		Jun 2013
 KernelVersion:	3.11
···
 		product		- gadget's product description
 		manufacturer	- gadget's manufacturer description
 
+What:		/config/usb-gadget/gadget/os_desc
+Date:		May 2014
+KernelVersion:	3.16
+Description:
+		This group contains "OS String" extension handling attributes.
+
+		use		- flag turning "OS Desctiptors" support on/off
+		b_vendor_code	- one-byte value used for custom per-device and
+				per-interface requests
+		qw_sign		- an identifier to be reported as "OS String"
+				proper

Documentation/DocBook/Makefile

···
 	    genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \
 	    80211.xml debugobjects.xml sh.xml regulator.xml \
 	    alsa-driver-api.xml writing-an-alsa-driver.xml \
-	    tracepoint.xml drm.xml media_api.xml w1.xml
+	    tracepoint.xml drm.xml media_api.xml w1.xml \
+	    writing_musb_glue_layer.xml
 
 include Documentation/DocBook/media/Makefile
 

Documentation/DocBook/writing_musb_glue_layer.tmpl

···
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+	"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
+
+<book id="Writing-MUSB-Glue-Layer">
+ <bookinfo>
+  <title>Writing an MUSB Glue Layer</title>
+
+  <authorgroup>
+   <author>
+    <firstname>Apelete</firstname>
+    <surname>Seketeli</surname>
+    <affiliation>
+     <address>
+      <email>apelete at seketeli.net</email>
+     </address>
+    </affiliation>
+   </author>
+  </authorgroup>
+
+  <copyright>
+   <year>2014</year>
+   <holder>Apelete Seketeli</holder>
+  </copyright>
+
+  <legalnotice>
+   <para>
+     This documentation 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.
+   </para>
+
+   <para>
+     This documentation 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.
+   </para>
+
+   <para>
+     You should have received a copy of the GNU General Public License
+     along with this documentation; if not, write to the Free Software
+     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+     02111-1307 USA
+   </para>
+
+   <para>
+     For more details see the file COPYING in the Linux kernel source
+     tree.
+   </para>
+  </legalnotice>
+ </bookinfo>
+
+<toc></toc>
+
+  <chapter id="introduction">
+    <title>Introduction</title>
+    <para>
+      The Linux MUSB subsystem is part of the larger Linux USB
+      subsystem. It provides support for embedded USB Device Controllers
+      (UDC) that do not use Universal Host Controller Interface (UHCI)
+      or Open Host Controller Interface (OHCI).
+    </para>
+    <para>
+      Instead, these embedded UDC rely on the USB On-the-Go (OTG)
+      specification which they implement at least partially. The silicon
+      reference design used in most cases is the Multipoint USB
+      Highspeed Dual-Role Controller (MUSB HDRC) found in the Mentor
+      Graphics Inventra™ design.
+    </para>
+    <para>
+      As a self-taught exercise I have written an MUSB glue layer for
+      the Ingenic JZ4740 SoC, modelled after the many MUSB glue layers
+      in the kernel source tree. This layer can be found at
+      drivers/usb/musb/jz4740.c. In this documentation I will walk
+      through the basics of the jz4740.c glue layer, explaining the
+      different pieces and what needs to be done in order to write your
+      own device glue layer.
+    </para>
+  </chapter>
+
+  <chapter id="linux-musb-basics">
+    <title>Linux MUSB Basics</title>
+    <para>
+      To get started on the topic, please read USB On-the-Go Basics (see
+      Resources) which provides an introduction of USB OTG operation at
+      the hardware level. A couple of wiki pages by Texas Instruments
+      and Analog Devices also provide an overview of the Linux kernel
+      MUSB configuration, albeit focused on some specific devices
+      provided by these companies. Finally, getting acquainted with the
+      USB specification at USB home page may come in handy, with
+      practical instance provided through the Writing USB Device Drivers
+      documentation (again, see Resources).
+    </para>
+    <para>
+      Linux USB stack is a layered architecture in which the MUSB
+      controller hardware sits at the lowest. The MUSB controller driver
+      abstract the MUSB controller hardware to the Linux USB stack.
+    </para>
+    <programlisting>
+      ------------------------
+      |                      | &lt;------- drivers/usb/gadget
+      | Linux USB Core Stack | &lt;------- drivers/usb/host
+      |                      | &lt;------- drivers/usb/core
+      ------------------------
+                 ⬍
+     --------------------------
+     |                        | &lt;------ drivers/usb/musb/musb_gadget.c
+     | MUSB Controller driver | &lt;------ drivers/usb/musb/musb_host.c
+     |                        | &lt;------ drivers/usb/musb/musb_core.c
+     --------------------------
+                 ⬍
+  ---------------------------------
+  | MUSB Platform Specific Driver |
+  |                               | &lt;-- drivers/usb/musb/jz4740.c
+  |       aka &quot;Glue Layer&quot;        |
+  ---------------------------------
+                 ⬍
+  ---------------------------------
+  |   MUSB Controller Hardware    |
+  ---------------------------------
+    </programlisting>
+    <para>
+      As outlined above, the glue layer is actually the platform
+      specific code sitting in between the controller driver and the
+      controller hardware.
+    </para>
+    <para>
+      Just like a Linux USB driver needs to register itself with the
+      Linux USB subsystem, the MUSB glue layer needs first to register
+      itself with the MUSB controller driver. This will allow the
+      controller driver to know about which device the glue layer
+      supports and which functions to call when a supported device is
+      detected or released; remember we are talking about an embedded
+      controller chip here, so no insertion or removal at run-time.
+    </para>
+    <para>
+      All of this information is passed to the MUSB controller driver
+      through a platform_driver structure defined in the glue layer as:
+    </para>
+    <programlisting linenumbering="numbered">
+static struct platform_driver jz4740_driver = {
+	.probe		= jz4740_probe,
+	.remove		= jz4740_remove,
+	.driver		= {
+		.name	= "musb-jz4740",
+	},
+};
+    </programlisting>
+    <para>
+      The probe and remove function pointers are called when a matching
+      device is detected and, respectively, released. The name string
+      describes the device supported by this glue layer. In the current
+      case it matches a platform_device structure declared in
+      arch/mips/jz4740/platform.c. Note that we are not using device
+      tree bindings here.
+    </para>
+    <para>
+      In order to register itself to the controller driver, the glue
+      layer goes through a few steps, basically allocating the
+      controller hardware resources and initialising a couple of
+      circuits. To do so, it needs to keep track of the information used
+      throughout these steps. This is done by defining a private
+      jz4740_glue structure:
+    </para>
+    <programlisting linenumbering="numbered">
+struct jz4740_glue {
+	struct device           *dev;
+	struct platform_device  *musb;
+	struct clk		*clk;
+};
+    </programlisting>
+    <para>
+      The dev and musb members are both device structure variables. The
+      first one holds generic information about the device, since it's
+      the basic device structure, and the latter holds information more
+      closely related to the subsystem the device is registered to. The
+      clk variable keeps information related to the device clock
+      operation.
+    </para>
+    <para>
+      Let's go through the steps of the probe function that leads the
+      glue layer to register itself to the controller driver.
+    </para>
+    <para>
+      N.B.: For the sake of readability each function will be split in
+      logical parts, each part being shown as if it was independent from
+      the others.
+    </para>
+    <programlisting linenumbering="numbered">
+static int jz4740_probe(struct platform_device *pdev)
+{
+	struct platform_device		*musb;
+	struct jz4740_glue		*glue;
+	struct clk                      *clk;
+	int				ret;
+
+	glue = devm_kzalloc(&amp;pdev->dev, sizeof(*glue), GFP_KERNEL);
+	if (!glue)
+		return -ENOMEM;
+
+	musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
+	if (!musb) {
+		dev_err(&amp;pdev->dev, "failed to allocate musb device\n");
+		return -ENOMEM;
+	}
+
+	clk = devm_clk_get(&amp;pdev->dev, "udc");
+	if (IS_ERR(clk)) {
+		dev_err(&amp;pdev->dev, "failed to get clock\n");
+		ret = PTR_ERR(clk);
+		goto err_platform_device_put;
+	}
+
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		dev_err(&amp;pdev->dev, "failed to enable clock\n");
+		goto err_platform_device_put;
+	}
+
+	musb->dev.parent		= &amp;pdev->dev;
+
+	glue->dev			= &amp;pdev->dev;
+	glue->musb			= musb;
+	glue->clk			= clk;
+
+	return 0;
+
+err_platform_device_put:
+	platform_device_put(musb);
+	return ret;
+}
+    </programlisting>
+    <para>
+      The first few lines of the probe function allocate and assign the
+      glue, musb and clk variables. The GFP_KERNEL flag (line 8) allows
+      the allocation process to sleep and wait for memory, thus being
+      usable in a blocking situation. The PLATFORM_DEVID_AUTO flag (line
+      12) allows automatic allocation and management of device IDs in
+      order to avoid device namespace collisions with explicit IDs. With
+      devm_clk_get() (line 18) the glue layer allocates the clock -- the
+      <literal>devm_</literal> prefix indicates that clk_get() is
+      managed: it automatically frees the allocated clock resource data
+      when the device is released -- and enable it.
+    </para>
+    <para>
+      Then comes the registration steps:
+    </para>
+    <programlisting linenumbering="numbered">
+static int jz4740_probe(struct platform_device *pdev)
+{
+	struct musb_hdrc_platform_data	*pdata = &amp;jz4740_musb_platform_data;
+
+	pdata->platform_ops		= &amp;jz4740_musb_ops;
+
+	platform_set_drvdata(pdev, glue);
+
+	ret = platform_device_add_resources(musb, pdev->resource,
+					    pdev->num_resources);
+	if (ret) {
+		dev_err(&amp;pdev->dev, "failed to add resources\n");
+		goto err_clk_disable;
+	}
+
+	ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
+	if (ret) {
+		dev_err(&amp;pdev->dev, "failed to add platform_data\n");
+		goto err_clk_disable;
+	}
+
+	return 0;
+
+err_clk_disable:
+	clk_disable_unprepare(clk);
+err_platform_device_put:
+	platform_device_put(musb);
+	return ret;
+}
+    </programlisting>
+    <para>
+      The first step is to pass the device data privately held by the
+      glue layer on to the controller driver through
+      platform_set_drvdata() (line 7). Next is passing on the device
+      resources information, also privately held at that point, through
+      platform_device_add_resources() (line 9).
+    </para>
+    <para>
+      Finally comes passing on the platform specific data to the
+      controller driver (line 16). Platform data will be discussed in
+      <link linkend="device-platform-data">Chapter 4</link>, but here
+      we are looking at the platform_ops function pointer (line 5) in
+      musb_hdrc_platform_data structure (line 3).  This function
+      pointer allows the MUSB controller driver to know which function
+      to call for device operation:
+    </para>
+    <programlisting linenumbering="numbered">
+static const struct musb_platform_ops jz4740_musb_ops = {
+	.init		= jz4740_musb_init,
+	.exit		= jz4740_musb_exit,
+};
+    </programlisting>
+    <para>
+      Here we have the minimal case where only init and exit functions
+      are called by the controller driver when needed. Fact is the
+      JZ4740 MUSB controller is a basic controller, lacking some
+      features found in other controllers, otherwise we may also have
+      pointers to a few other functions like a power management function
+      or a function to switch between OTG and non-OTG modes, for
+      instance.
+    </para>
+    <para>
+      At that point of the registration process, the controller driver
+      actually calls the init function:
+    </para>
+    <programlisting linenumbering="numbered">
+static int jz4740_musb_init(struct musb *musb)
+{
+	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
+	if (!musb->xceiv) {
+		pr_err("HS UDC: no transceiver configured\n");
+		return -ENODEV;
+	}
+
+	/* Silicon does not implement ConfigData register.
+	 * Set dyn_fifo to avoid reading EP config from hardware.
+	 */
+	musb->dyn_fifo = true;
+
+	musb->isr = jz4740_musb_interrupt;
+
+	return 0;
+}
+    </programlisting>
+    <para>
+      The goal of jz4740_musb_init() is to get hold of the transceiver
+      driver data of the MUSB controller hardware and pass it on to the
+      MUSB controller driver, as usual. The transceiver is the circuitry
+      inside the controller hardware responsible for sending/receiving
+      the USB data. Since it is an implementation of the physical layer
+      of the OSI model, the transceiver is also referred to as PHY.
+    </para>
+    <para>
+      Getting hold of the MUSB PHY driver data is done with
+      usb_get_phy() which returns a pointer to the structure
+      containing the driver instance data. The next couple of
+      instructions (line 12 and 14) are used as a quirk and to setup
+      IRQ handling respectively. Quirks and IRQ handling will be
+      discussed later in <link linkend="device-quirks">Chapter
+      5</link> and <link linkend="handling-irqs">Chapter 3</link>.
+    </para>
+    <programlisting linenumbering="numbered">
+static int jz4740_musb_exit(struct musb *musb)
+{
+	usb_put_phy(musb->xceiv);
+
+	return 0;
+}
+    </programlisting>
+    <para>
+      Acting as the counterpart of init, the exit function releases the
+      MUSB PHY driver when the controller hardware itself is about to be
+      released.
+    </para>
+    <para>
+      Again, note that init and exit are fairly simple in this case due
+      to the basic set of features of the JZ4740 controller hardware.
+      When writing an musb glue layer for a more complex controller
+      hardware, you might need to take care of more processing in those
+      two functions.
+    </para>
+    <para>
+      Returning from the init function, the MUSB controller driver jumps
+      back into the probe function:
+    </para>
+    <programlisting linenumbering="numbered">
+static int jz4740_probe(struct platform_device *pdev)
+{
+	ret = platform_device_add(musb);
+	if (ret) {
+		dev_err(&amp;pdev->dev, "failed to register musb device\n");
+		goto err_clk_disable;
+	}
+
+	return 0;
+
+err_clk_disable:
+	clk_disable_unprepare(clk);
+err_platform_device_put:
+	platform_device_put(musb);
+	return ret;
+}
+    </programlisting>
+    <para>
+      This is the last part of the device registration process where the
+      glue layer adds the controller hardware device to Linux kernel
+      device hierarchy: at this stage, all known information about the
+      device is passed on to the Linux USB core stack.
+    </para>
+    <programlisting linenumbering="numbered">
+static int jz4740_remove(struct platform_device *pdev)
+{
+	struct jz4740_glue	*glue = platform_get_drvdata(pdev);
+
+	platform_device_unregister(glue->musb);
+	clk_disable_unprepare(glue->clk);
+
+	return 0;
+}
+    </programlisting>
+    <para>
+      Acting as the counterpart of probe, the remove function unregister
+      the MUSB controller hardware (line 5) and disable the clock (line
+      6), allowing it to be gated.
+    </para>
+  </chapter>
+
+  <chapter id="handling-irqs">
+    <title>Handling IRQs</title>
+    <para>
+      Additionally to the MUSB controller hardware basic setup and
+      registration, the glue layer is also responsible for handling the
+      IRQs:
+    </para>
+    <programlisting linenumbering="numbered">
+static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
+{
+	unsigned long   flags;
+	irqreturn_t     retval = IRQ_NONE;
+	struct musb     *musb = __hci;
+
+	spin_lock_irqsave(&amp;musb->lock, flags);
+
+	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
+	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
+	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
+
+	/*
+	 * The controller is gadget only, the state of the host mode IRQ bits is
+	 * undefined. Mask them to make sure that the musb driver core will
+	 * never see them set
+	 */
+	musb->int_usb &amp;= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
+	    MUSB_INTR_RESET | MUSB_INTR_SOF;
+
+	if (musb->int_usb || musb->int_tx || musb->int_rx)
+		retval = musb_interrupt(musb);
+
+	spin_unlock_irqrestore(&amp;musb->lock, flags);
+
+	return retval;
+}
+    </programlisting>
+    <para>
+      Here the glue layer mostly has to read the relevant hardware
+      registers and pass their values on to the controller driver which
+      will handle the actual event that triggered the IRQ.
+    </para>
+    <para>
+      The interrupt handler critical section is protected by the
+      spin_lock_irqsave() and counterpart spin_unlock_irqrestore()
+      functions (line 7 and 24 respectively), which prevent the
+      interrupt handler code to be run by two different threads at the
+      same time.
+    </para>
+    <para>
+      Then the relevant interrupt registers are read (line 9 to 11):
+    </para>
+    <itemizedlist>
+      <listitem>
+        <para>
+          MUSB_INTRUSB: indicates which USB interrupts are currently
+          active,
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          MUSB_INTRTX: indicates which of the interrupts for TX
+          endpoints are currently active,
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          MUSB_INTRRX: indicates which of the interrupts for TX
+          endpoints are currently active.
+        </para>
+      </listitem>
+    </itemizedlist>
+    <para>
+      Note that musb_readb() is used to read 8-bit registers at most,
+      while musb_readw() allows us to read at most 16-bit registers.
+      There are other functions that can be used depending on the size
+      of your device registers. See musb_io.h for more information.
+    </para>
+    <para>
+      Instruction on line 18 is another quirk specific to the JZ4740
+      USB device controller, which will be discussed later in <link
+      linkend="device-quirks">Chapter 5</link>.
+    </para>
+    <para>
+      The glue layer still needs to register the IRQ handler though.
+      Remember the instruction on line 14 of the init function:
+    </para>
+    <programlisting linenumbering="numbered">
+static int jz4740_musb_init(struct musb *musb)
+{
+	musb->isr = jz4740_musb_interrupt;
+
+	return 0;
+}
+    </programlisting>
+    <para>
+      This instruction sets a pointer to the glue layer IRQ handler
+      function, in order for the controller hardware to call the handler
+      back when an IRQ comes from the controller hardware. The interrupt
+      handler is now implemented and registered.
+    </para>
+  </chapter>
+
+  <chapter id="device-platform-data">
+    <title>Device Platform Data</title>
+    <para>
+      In order to write an MUSB glue layer, you need to have some data
+      describing the hardware capabilities of your controller hardware,
+      which is called the platform data.
+    </para>
+    <para>
+      Platform data is specific to your hardware, though it may cover a
+      broad range of devices, and is generally found somewhere in the
+      arch/ directory, depending on your device architecture.
+    </para>
+    <para>
+      For instance, platform data for the JZ4740 SoC is found in
+      arch/mips/jz4740/platform.c. In the platform.c file each device of
+      the JZ4740 SoC is described through a set of structures.
+    </para>
+    <para>
+      Here is the part of arch/mips/jz4740/platform.c that covers the
+      USB Device Controller (UDC):
+    </para>
+    <programlisting linenumbering="numbered">
+/* USB Device Controller */
+struct platform_device jz4740_udc_xceiv_device = {
+	.name = "usb_phy_gen_xceiv",
+	.id   = 0,
+};
+
+static struct resource jz4740_udc_resources[] = {
+	[0] = {
+		.start = JZ4740_UDC_BASE_ADDR,
+		.end   = JZ4740_UDC_BASE_ADDR + 0x10000 - 1,
+		.flags = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start = JZ4740_IRQ_UDC,
+		.end   = JZ4740_IRQ_UDC,
+		.flags = IORESOURCE_IRQ,
+		.name  = "mc",
+	},
+};
+
+struct platform_device jz4740_udc_device = {
+	.name = "musb-jz4740",
+	.id   = -1,
+	.dev  = {
+		.dma_mask          = &amp;jz4740_udc_device.dev.coherent_dma_mask,
+		.coherent_dma_mask = DMA_BIT_MASK(32),
+	},
+	.num_resources = ARRAY_SIZE(jz4740_udc_resources),
+	.resource      = jz4740_udc_resources,
+};
+    </programlisting>
+    <para>
+      The jz4740_udc_xceiv_device platform device structure (line 2)
+      describes the UDC transceiver with a name and id number.
+    </para>
+    <para>
+      At the time of this writing, note that
+      &quot;usb_phy_gen_xceiv&quot; is the specific name to be used for
+      all transceivers that are either built-in with reference USB IP or
+      autonomous and doesn't require any PHY programming. You will need
+      to set CONFIG_NOP_USB_XCEIV=y in the kernel configuration to make
+      use of the corresponding transceiver driver. The id field could be
+      set to -1 (equivalent to PLATFORM_DEVID_NONE), -2 (equivalent to
+      PLATFORM_DEVID_AUTO) or start with 0 for the first device of this
+      kind if we want a specific id number.
+    </para>
+    <para>
+      The jz4740_udc_resources resource structure (line 7) defines the
+      UDC registers base addresses.
+    </para>
+    <para>
+      The first array (line 9 to 11) defines the UDC registers base
+      memory addresses: start points to the first register memory
+      address, end points to the last register memory address and the
+      flags member defines the type of resource we are dealing with. So
+      IORESOURCE_MEM is used to define the registers memory addresses.
+      The second array (line 14 to 17) defines the UDC IRQ registers
+      addresses. Since there is only one IRQ register available for the
+      JZ4740 UDC, start and end point at the same address. The
+      IORESOURCE_IRQ flag tells that we are dealing with IRQ resources,
+      and the name &quot;mc&quot; is in fact hard-coded in the MUSB core
+      in order for the controller driver to retrieve this IRQ resource
+      by querying it by its name.
+    </para>
+    <para>
+      Finally, the jz4740_udc_device platform device structure (line 21)
+      describes the UDC itself.
+    </para>
+    <para>
+      The &quot;musb-jz4740&quot; name (line 22) defines the MUSB
+      driver that is used for this device; remember this is in fact
+      the name that we used in the jz4740_driver platform driver
+      structure in <link linkend="linux-musb-basics">Chapter
+      2</link>. The id field (line 23) is set to -1 (equivalent to
+      PLATFORM_DEVID_NONE) since we do not need an id for the device:
+      the MUSB controller driver was already set to allocate an
+      automatic id in <link linkend="linux-musb-basics">Chapter
+      2</link>. In the dev field we care for DMA related information
+      here. The dma_mask field (line 25) defines the width of the DMA
+      mask that is going to be used, and coherent_dma_mask (line 26)
+      has the same purpose but for the alloc_coherent DMA mappings: in
+      both cases we are using a 32 bits mask. Then the resource field
+      (line 29) is simply a pointer to the resource structure defined
+      before, while the num_resources field (line 28) keeps track of
+      the number of arrays defined in the resource structure (in this
+      case there were two resource arrays defined before).
+    </para>
+    <para>
+      With this quick overview of the UDC platform data at the arch/
+      level now done, let's get back to the MUSB glue layer specific
+      platform data in drivers/usb/musb/jz4740.c:
+    </para>
+    <programlisting linenumbering="numbered">
+static struct musb_hdrc_config jz4740_musb_config = {
+	/* Silicon does not implement USB OTG. */
+	.multipoint = 0,
+	/* Max EPs scanned, driver will decide which EP can be used. */
+	.num_eps    = 4,
+	/* RAMbits needed to configure EPs from table */
+	.ram_bits   = 9,
+	.fifo_cfg = jz4740_musb_fifo_cfg,
+	.fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
+};
+
+static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
+	.mode   = MUSB_PERIPHERAL,
+	.config = &amp;jz4740_musb_config,
+};
+    </programlisting>
+    <para>
+      First the glue layer configures some aspects of the controller
+      driver operation related to the controller hardware specifics.
+      This is done through the jz4740_musb_config musb_hdrc_config
+      structure.
+    </para>
+    <para>
+      Defining the OTG capability of the controller hardware, the
+      multipoint member (line 3) is set to 0 (equivalent to false)
+      since the JZ4740 UDC is not OTG compatible. Then num_eps (line
+      5) defines the number of USB endpoints of the controller
+      hardware, including endpoint 0: here we have 3 endpoints +
+      endpoint 0. Next is ram_bits (line 7) which is the width of the
+      RAM address bus for the MUSB controller hardware. This
+      information is needed when the controller driver cannot
+      automatically configure endpoints by reading the relevant
+      controller hardware registers. This issue will be discussed when
+      we get to device quirks in <link linkend="device-quirks">Chapter
+      5</link>. Last two fields (line 8 and 9) are also about device
+      quirks: fifo_cfg points to the USB endpoints configuration table
+      and fifo_cfg_size keeps track of the size of the number of
+      entries in that configuration table. More on that later in <link
+      linkend="device-quirks">Chapter 5</link>.
+    </para>
+    <para>
+      Then this configuration is embedded inside
+      jz4740_musb_platform_data musb_hdrc_platform_data structure (line
+      11): config is a pointer to the configuration structure itself,
+      and mode tells the controller driver if the controller hardware
+      may be used as MUSB_HOST only, MUSB_PERIPHERAL only or MUSB_OTG
+      which is a dual mode.
+    </para>
+    <para>
+      Remember that jz4740_musb_platform_data is then used to convey
+      platform data information as we have seen in the probe function
+      in <link linkend="linux-musb-basics">Chapter 2</link>
+    </para>
+  </chapter>
+
+  <chapter id="device-quirks">
+    <title>Device Quirks</title>
+    <para>
+      Completing the platform data specific to your device, you may also
+      need to write some code in the glue layer to work around some
+      device specific limitations. These quirks may be due to some
+      hardware bugs, or simply be the result of an incomplete
+      implementation of the USB On-the-Go specification.
+    </para>
+    <para>
+      The JZ4740 UDC exhibits such quirks, some of which we will discuss
+      here for the sake of insight even though these might not be found
+      in the controller hardware you are working on.
+    </para>
+    <para>
+      Let's get back to the init function first:
+    </para>
+    <programlisting linenumbering="numbered">
+static int jz4740_musb_init(struct musb *musb)
+{
+	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
+	if (!musb->xceiv) {
+		pr_err("HS UDC: no transceiver configured\n");
+		return -ENODEV;
+	}
+
+	/* Silicon does not implement ConfigData register.
+	 * Set dyn_fifo to avoid reading EP config from hardware.
+	 */
+	musb->dyn_fifo = true;
+
+	musb->isr = jz4740_musb_interrupt;
+
+	return 0;
+}
+    </programlisting>
+    <para>
+      Instruction on line 12 helps the MUSB controller driver to work
+      around the fact that the controller hardware is missing registers
+      that are used for USB endpoints configuration.
+    </para>
+    <para>
+      Without these registers, the controller driver is unable to read
+      the endpoints configuration from the hardware, so we use line 12
+      instruction to bypass reading the configuration from silicon, and
+      rely on a hard-coded table that describes the endpoints
+      configuration instead:
+    </para>
+    <programlisting linenumbering="numbered">
+static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
+{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
+{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
+{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
+};
+    </programlisting>
+    <para>
+      Looking at the configuration table above, we see that each
+      endpoints is described by three fields: hw_ep_num is the endpoint
+      number, style is its direction (either FIFO_TX for the controller
+      driver to send packets in the controller hardware, or FIFO_RX to
+      receive packets from hardware), and maxpacket defines the maximum
+      size of each data packet that can be transmitted over that
+      endpoint. Reading from the table, the controller driver knows that
+      endpoint 1 can be used to send and receive USB data packets of 512
+      bytes at once (this is in fact a bulk in/out endpoint), and
+      endpoint 2 can be used to send data packets of 64 bytes at once
+      (this is in fact an interrupt endpoint).
+    </para>
+    <para>
+      Note that there is no information about endpoint 0 here: that one
+      is implemented by default in every silicon design, with a
+      predefined configuration according to the USB specification. For
+      more examples of endpoint configuration tables, see musb_core.c.
+    </para>
+    <para>
+      Let's now get back to the interrupt handler function:
+    </para>
+    <programlisting linenumbering="numbered">
+static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
+{
+	unsigned long   flags;
+	irqreturn_t     retval = IRQ_NONE;
+	struct musb     *musb = __hci;
+
+	spin_lock_irqsave(&amp;musb->lock, flags);
+
+	musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
+	musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
+	musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
+
+	/*
+	 * The controller is gadget only, the state of the host mode IRQ bits is
+	 * undefined. Mask them to make sure that the musb driver core will
+	 * never see them set
+	 */
+	musb->int_usb &amp;= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
+	    MUSB_INTR_RESET | MUSB_INTR_SOF;
+
+	if (musb->int_usb || musb->int_tx || musb->int_rx)
+		retval = musb_interrupt(musb);
+
+	spin_unlock_irqrestore(&amp;musb->lock, flags);
+
+	return retval;
+}
+    </programlisting>
+    <para>
+      Instruction on line 18 above is a way for the controller driver to
+      work around the fact that some interrupt bits used for USB host
+      mode operation are missing in the MUSB_INTRUSB register, thus left
+      in an undefined hardware state, since this MUSB controller
+      hardware is used in peripheral mode only. As a consequence, the
+      glue layer masks these missing bits out to avoid parasite
+      interrupts by doing a logical AND operation between the value read
+      from MUSB_INTRUSB and the bits that are actually implemented in
+      the register.
+    </para>
+    <para>
+      These are only a couple of the quirks found in the JZ4740 USB
+      device controller. Some others were directly addressed in the MUSB
+      core since the fixes were generic enough to provide a better
+      handling of the issues for others controller hardware eventually.
+    </para>
+  </chapter>
+
+  <chapter id="conclusion">
+    <title>Conclusion</title>
+    <para>
+      Writing a Linux MUSB glue layer should be a more accessible task,
+      as this documentation tries to show the ins and outs of this
+      exercise.
+    </para>
+    <para>
+      The JZ4740 USB device controller being fairly simple, I hope its
+      glue layer serves as a good example for the curious mind. Used
+      with the current MUSB glue layers, this documentation should
+      provide enough guidance to get started; should anything gets out
+      of hand, the linux-usb mailing list archive is another helpful
+      resource to browse through.
+    </para>
+  </chapter>
+
+  <chapter id="acknowledgements">
+    <title>Acknowledgements</title>
+    <para>
+      Many thanks to Lars-Peter Clausen and Maarten ter Huurne for
+      answering my questions while I was writing the JZ4740 glue layer
+      and for helping me out getting the code in good shape.
+    </para>
+    <para>
+      I would also like to thank the Qi-Hardware community at large for
+      its cheerful guidance and support.
+    </para>
+  </chapter>
+
+  <chapter id="resources">
+    <title>Resources</title>
+    <para>
+      USB Home Page:
+      <ulink url="http://www.usb.org">http://www.usb.org</ulink>
+    </para>
+    <para>
+      linux-usb Mailing List Archives:
+      <ulink url="http://marc.info/?l=linux-usb">http://marc.info/?l=linux-usb</ulink>
+    </para>
+    <para>
+      USB On-the-Go Basics:
+      <ulink url="http://www.maximintegrated.com/app-notes/index.mvp/id/1822">http://www.maximintegrated.com/app-notes/index.mvp/id/1822</ulink>
+    </para>
+    <para>
+      Writing USB Device Drivers:
+      <ulink url="https://www.kernel.org/doc/htmldocs/writing_usb_driver/index.html">https://www.kernel.org/doc/htmldocs/writing_usb_driver/index.html</ulink>
+    </para>
+    <para>
+      Texas Instruments USB Configuration Wiki Page:
+      <ulink url="http://processors.wiki.ti.com/index.php/Usbgeneralpage">http://processors.wiki.ti.com/index.php/Usbgeneralpage</ulink>
+    </para>
+    <para>
+      Analog Devices Blackfin MUSB Configuration:
+      <ulink url="http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:musb">http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:musb</ulink>
+    </para>
+  </chapter>
+
+</book>

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

···
 
 - reg : Address and length of the register set for the device
 
-- interrupts : Interrupt numbers for this device
+- interrupts : Interrupt numbers for this device. Either one interrupt number
+	for all interrupts, or one for status related interrupts, one for IN
+	endpoint related interrupts and one for OUT endpoint related interrupts.
 
 Optional properties:
 
-- epobufsizes : An array of buffer sizes for OUT endpoints. If the property is
-	not present, or for endpoints outside of the array, 1024 is assumed by
-	the driver.
+- epobufsizes : Array of buffer sizes for OUT endpoints when they differ
+	from the default size of 1024. The array is indexed by the OUT endpoint
+	number. If the property is present it typically contains one entry for
+	each OUT endpoint of the core. Fewer entries overrides the default sizes
+	only for as many endpoints as the array contains.
 
-- epibufsizes : An array of buffer sizes for IN endpoints. If the property is
-	not present, or for endpoints outside of the array, 1024 is assumed by
-	the driver.
+- epibufsizes : Array of buffer sizes for IN endpoints when they differ
+	from the default size of 1024. The array is indexed by the IN endpoint
+	number. If the property is present it typically contains one entry for
+	each IN endpoint of the core. Fewer entries overrides the default sizes
+	only for as many endpoints as the array contains.
 
 For further information look in the documentation for the GLIB IP core library:
 http://www.gaisler.com/products/grlib/grip.pdf

Documentation/devicetree/bindings/usb/msm-hsusb.txt

···
 		usb-phy = <&usb_otg>;
 	};
 
+USB PHY with optional OTG:
+
+Required properties:
+- compatible:   Should contain:
+  "qcom,usb-otg-ci" for chipsets with ChipIdea 45nm PHY
+  "qcom,usb-otg-snps" for chipsets with Synopsys 28nm PHY
+
+- regs:         Offset and length of the register set in the memory map
+- interrupts:   interrupt-specifier for the OTG interrupt.
+
+- clocks:       A list of phandle + clock-specifier pairs for the
+                clocks listed in clock-names
+- clock-names:  Should contain the following:
+  "phy"         USB PHY reference clock
+  "core"        Protocol engine clock
+  "iface"       Interface bus clock
+  "alt_core"    Protocol engine clock for targets with asynchronous
+                reset methodology. (optional)
+
+- vdccx-supply: phandle to the regulator for the vdd supply for
+                digital circuit operation.
+- v1p8-supply:  phandle to the regulator for the 1.8V supply
+- v3p3-supply:  phandle to the regulator for the 3.3V supply
+
+- resets:       A list of phandle + reset-specifier pairs for the
+                resets listed in reset-names
+- reset-names:  Should contain the following:
+  "phy"         USB PHY controller reset
+  "link"        USB LINK controller reset
+
+- qcom,otg-control: OTG control (VBUS and ID notifications) can be one of
+                1 - PHY control
+                2 - PMIC control
+
+Optional properties:
+- dr_mode:      One of "host", "peripheral" or "otg". Defaults to "otg"
+
+- qcom,phy-init-sequence: PHY configuration sequence values. This is related to Device
+                Mode Eye Diagram test. Start address at which these values will be
+                written is ULPI_EXT_VENDOR_SPECIFIC. Value of -1 is reserved as
+                "do not overwrite default value at this address".
+                For example: qcom,phy-init-sequence = < -1 0x63 >;
+                Will update only value at address ULPI_EXT_VENDOR_SPECIFIC + 1.
+
+- qcom,phy-num: Select number of pyco-phy to use, can be one of
+                0 - PHY one, default
+                1 - Second PHY
+                Some platforms may have configuration to allow USB
+                controller work with any of the two HSPHYs present.
+
+- qcom,vdd-levels: This property must be a list of three integer values
+                (no, min, max) where each value represents either a voltage
+                in microvolts or a value corresponding to voltage corner.
+
+Example HSUSB OTG controller device node:
+
+    usb@f9a55000 {
+        compatible = "qcom,usb-otg-snps";
+        reg = <0xf9a55000 0x400>;
+        interrupts = <0 134 0>;
+        dr_mode = "peripheral";
+
+        clocks = <&gcc GCC_XO_CLK>, <&gcc GCC_USB_HS_SYSTEM_CLK>,
+                <&gcc GCC_USB_HS_AHB_CLK>;
+
+        clock-names = "phy", "core", "iface";
+
+        vddcx-supply = <&pm8841_s2_corner>;
+        v1p8-supply = <&pm8941_l6>;
+        v3p3-supply = <&pm8941_l24>;
+
+        resets = <&gcc GCC_USB2A_PHY_BCR>, <&gcc GCC_USB_HS_BCR>;
+        reset-names = "phy", "link";
+
+        qcom,otg-control = <1>;
+        qcom,phy-init-sequence = < -1 0x63 >;
+        qcom,vdd-levels = <1 5 7>;
+	};

arch/arm/mach-msm/board-msm7x30.c

···
 
 static struct msm_otg_platform_data msm_otg_pdata = {
 	.phy_init_seq		= hsusb_phy_init_seq,
-	.mode                   = USB_PERIPHERAL,
+	.mode                   = USB_DR_MODE_PERIPHERAL,
 	.otg_control		= OTG_PHY_CONTROL,
 	.link_clk_reset		= hsusb_link_clk_reset,
 	.phy_clk_reset		= hsusb_phy_clk_reset,

arch/arm/mach-msm/board-qsd8x50.c

···
 
 static struct msm_otg_platform_data msm_otg_pdata = {
 	.phy_init_seq		= hsusb_phy_init_seq,
-	.mode                   = USB_PERIPHERAL,
+	.mode                   = USB_DR_MODE_PERIPHERAL,
 	.otg_control		= OTG_PHY_CONTROL,
 	.link_clk_reset		= hsusb_link_clk_reset,
 	.phy_clk_reset		= hsusb_phy_clk_reset,

arch/arm/mach-omap2/board-omap3beagle.c

···
 #include <linux/mtd/nand.h>
 #include <linux/mmc/host.h>
 #include <linux/usb/phy.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
 
 #include <linux/regulator/machine.h>
 #include <linux/i2c/twl.h>

arch/arm/mach-omap2/usb-host.c

···
 #include <linux/io.h>
 #include <linux/gpio.h>
 #include <linux/usb/phy.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 
 #include "soc.h"
 #include "omap_device.h"
···
 	/* .init_data filled later */
 };
 
-static const char *nop_name = "usb_phy_gen_xceiv"; /* NOP PHY driver */
+static const char *nop_name = "usb_phy_generic"; /* NOP PHY driver */
 static const char *reg_name = "reg-fixed-voltage"; /* Regulator driver */
 
 /**
···
 	struct platform_device *pdev;
 	char *phy_id;
 	struct platform_device_info pdevinfo;
-	struct usb_phy_gen_xceiv_platform_data nop_pdata;
+	struct usb_phy_generic_platform_data nop_pdata;
 
 	for (i = 0; i < num_phys; i++) {
 
···
 		pdevinfo.id = phy->port;
 		pdevinfo.data = &nop_pdata;
 		pdevinfo.size_data =
-			sizeof(struct usb_phy_gen_xceiv_platform_data);
-		scnprintf(phy_id, MAX_STR, "usb_phy_gen_xceiv.%d",
+			sizeof(struct usb_phy_generic_platform_data);
+		scnprintf(phy_id, MAX_STR, "usb_phy_generic.%d",
 					phy->port);
 		pdev = platform_device_register_full(&pdevinfo);
 		if (IS_ERR(pdev)) {

drivers/usb/dwc3/Kconfig

···
 
 config USB_DWC3_OMAP
 	tristate "Texas Instruments OMAP5 and similar Platforms"
-	depends on EXTCON
+	depends on EXTCON && (ARCH_OMAP2PLUS || COMPILE_TEST)
 	default USB_DWC3
 	help
 	  Some platforms from Texas Instruments like OMAP5, DRA7xxx and
···
 
 config USB_DWC3_EXYNOS
 	tristate "Samsung Exynos Platform"
+	depends on ARCH_EXYNOS || COMPILE_TEST
 	default USB_DWC3
 	help
 	  Recent Exynos5 SoCs ship with one DesignWare Core USB3 IP inside,
···
 
 config USB_DWC3_KEYSTONE
 	tristate "Texas Instruments Keystone2 Platforms"
+	depends on ARCH_KEYSTONE || COMPILE_TEST
 	default USB_DWC3
 	help
 	  Support of USB2/3 functionality in TI Keystone2 platforms.

drivers/usb/dwc3/core.c

···
 	phy_exit(dwc->usb3_generic_phy);
 }
 
-#define DWC3_ALIGN_MASK		(16 - 1)
-
-static int dwc3_probe(struct platform_device *pdev)
+static int dwc3_core_get_phy(struct dwc3 *dwc)
 {
-	struct device		*dev = &pdev->dev;
-	struct dwc3_platform_data *pdata = dev_get_platdata(dev);
+	struct device		*dev = dwc->dev;
 	struct device_node	*node = dev->of_node;
-	struct resource		*res;
-	struct dwc3		*dwc;
-
-	int			ret = -ENOMEM;
-
-	void __iomem		*regs;
-	void			*mem;
-
-	mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
-	if (!mem) {
-		dev_err(dev, "not enough memory\n");
-		return -ENOMEM;
-	}
-	dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
-	dwc->mem = mem;
-
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(dev, "missing IRQ\n");
-		return -ENODEV;
-	}
-	dwc->xhci_resources[1].start = res->start;
-	dwc->xhci_resources[1].end = res->end;
-	dwc->xhci_resources[1].flags = res->flags;
-	dwc->xhci_resources[1].name = res->name;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(dev, "missing memory resource\n");
-		return -ENODEV;
-	}
+	int ret;
 
 	if (node) {
-		dwc->maximum_speed = of_usb_get_maximum_speed(node);
-
 		dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
 		dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
-
-		dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
-		dwc->dr_mode = of_usb_get_dr_mode(node);
-	} else if (pdata) {
-		dwc->maximum_speed = pdata->maximum_speed;
-
-		dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
-		dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
-
-		dwc->needs_fifo_resize = pdata->tx_fifo_resize;
-		dwc->dr_mode = pdata->dr_mode;
 	} else {
 		dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 		dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
 	}
-
-	/* default to superspeed if no maximum_speed passed */
-	if (dwc->maximum_speed == USB_SPEED_UNKNOWN)
-		dwc->maximum_speed = USB_SPEED_SUPER;
 
 	if (IS_ERR(dwc->usb2_phy)) {
 		ret = PTR_ERR(dwc->usb2_phy);
···
 		}
 	}
 
+	return 0;
+}
+
+static int dwc3_core_init_mode(struct dwc3 *dwc)
+{
+	struct device *dev = dwc->dev;
+	int ret;
+
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
+		ret = dwc3_gadget_init(dwc);
+		if (ret) {
+			dev_err(dev, "failed to initialize gadget\n");
+			return ret;
+		}
+		break;
+	case USB_DR_MODE_HOST:
+		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
+		ret = dwc3_host_init(dwc);
+		if (ret) {
+			dev_err(dev, "failed to initialize host\n");
+			return ret;
+		}
+		break;
+	case USB_DR_MODE_OTG:
+		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
+		ret = dwc3_host_init(dwc);
+		if (ret) {
+			dev_err(dev, "failed to initialize host\n");
+			return ret;
+		}
+
+		ret = dwc3_gadget_init(dwc);
+		if (ret) {
+			dev_err(dev, "failed to initialize gadget\n");
+			return ret;
+		}
+		break;
+	default:
+		dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void dwc3_core_exit_mode(struct dwc3 *dwc)
+{
+	switch (dwc->dr_mode) {
+	case USB_DR_MODE_PERIPHERAL:
+		dwc3_gadget_exit(dwc);
+		break;
+	case USB_DR_MODE_HOST:
+		dwc3_host_exit(dwc);
+		break;
+	case USB_DR_MODE_OTG:
+		dwc3_host_exit(dwc);
+		dwc3_gadget_exit(dwc);
+		break;
+	default:
+		/* do nothing */
+		break;
+	}
+}
+
+#define DWC3_ALIGN_MASK		(16 - 1)
+
+static int dwc3_probe(struct platform_device *pdev)
+{
+	struct device		*dev = &pdev->dev;
+	struct dwc3_platform_data *pdata = dev_get_platdata(dev);
+	struct device_node	*node = dev->of_node;
+	struct resource		*res;
+	struct dwc3		*dwc;
+
+	int			ret;
+
+	void __iomem		*regs;
+	void			*mem;
+
+	mem = devm_kzalloc(dev, sizeof(*dwc) + DWC3_ALIGN_MASK, GFP_KERNEL);
+	if (!mem) {
+		dev_err(dev, "not enough memory\n");
+		return -ENOMEM;
+	}
+	dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
+	dwc->mem = mem;
+	dwc->dev = dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!res) {
+		dev_err(dev, "missing IRQ\n");
+		return -ENODEV;
+	}
+	dwc->xhci_resources[1].start = res->start;
+	dwc->xhci_resources[1].end = res->end;
+	dwc->xhci_resources[1].flags = res->flags;
+	dwc->xhci_resources[1].name = res->name;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "missing memory resource\n");
+		return -ENODEV;
+	}
+
+	if (node) {
+		dwc->maximum_speed = of_usb_get_maximum_speed(node);
+
+		dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
+		dwc->dr_mode = of_usb_get_dr_mode(node);
+	} else if (pdata) {
+		dwc->maximum_speed = pdata->maximum_speed;
+
+		dwc->needs_fifo_resize = pdata->tx_fifo_resize;
+		dwc->dr_mode = pdata->dr_mode;
+	}
+
+	/* default to superspeed if no maximum_speed passed */
+	if (dwc->maximum_speed == USB_SPEED_UNKNOWN)
+		dwc->maximum_speed = USB_SPEED_SUPER;
+
+	ret = dwc3_core_get_phy(dwc);
+	if (ret)
+		return ret;
+
 	dwc->xhci_resources[0].start = res->start;
 	dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
 					DWC3_XHCI_REGS_END;
···
 
 	dwc->regs	= regs;
 	dwc->regs_size	= resource_size(res);
-	dwc->dev	= dev;
 
 	dev->dma_mask	= dev->parent->dma_mask;
 	dev->dma_parms	= dev->parent->dma_parms;
···
 		goto err_usb3phy_power;
 	}
 
-	switch (dwc->dr_mode) {
-	case USB_DR_MODE_PERIPHERAL:
-		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
-		ret = dwc3_gadget_init(dwc);
-		if (ret) {
-			dev_err(dev, "failed to initialize gadget\n");
-			goto err2;
-		}
-		break;
-	case USB_DR_MODE_HOST:
-		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_HOST);
-		ret = dwc3_host_init(dwc);
-		if (ret) {
-			dev_err(dev, "failed to initialize host\n");
-			goto err2;
-		}
-		break;
-	case USB_DR_MODE_OTG:
-		dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_OTG);
-		ret = dwc3_host_init(dwc);
-		if (ret) {
-			dev_err(dev, "failed to initialize host\n");
-			goto err2;
-		}
-
-		ret = dwc3_gadget_init(dwc);
-		if (ret) {
-			dev_err(dev, "failed to initialize gadget\n");
-			goto err2;
-		}
-		break;
-	default:
-		dev_err(dev, "Unsupported mode of operation %d\n", dwc->dr_mode);
+	ret = dwc3_core_init_mode(dwc);
+	if (ret)
 		goto err2;
-	}
 
 	ret = dwc3_debugfs_init(dwc);
 	if (ret) {
···
 	return 0;
 
 err3:
-	switch (dwc->dr_mode) {
-	case USB_DR_MODE_PERIPHERAL:
-		dwc3_gadget_exit(dwc);
-		break;
-	case USB_DR_MODE_HOST:
-		dwc3_host_exit(dwc);
-		break;
-	case USB_DR_MODE_OTG:
-		dwc3_host_exit(dwc);
-		dwc3_gadget_exit(dwc);
-		break;
-	default:
-		/* do nothing */
-		break;
-	}
+	dwc3_core_exit_mode(dwc);
 
 err2:
 	dwc3_event_buffers_cleanup(dwc);
···
 	pm_runtime_disable(&pdev->dev);
 
 	dwc3_debugfs_exit(dwc);
-
-	switch (dwc->dr_mode) {
-	case USB_DR_MODE_PERIPHERAL:
-		dwc3_gadget_exit(dwc);
-		break;
-	case USB_DR_MODE_HOST:
-		dwc3_host_exit(dwc);
-		break;
-	case USB_DR_MODE_OTG:
-		dwc3_host_exit(dwc);
-		dwc3_gadget_exit(dwc);
-		break;
-	default:
-		/* do nothing */
-		break;
-	}
-
+	dwc3_core_exit_mode(dwc);
 	dwc3_event_buffers_cleanup(dwc);
 	dwc3_free_event_buffers(dwc);
 	dwc3_core_exit(dwc);

drivers/usb/dwc3/dwc3-exynos.c

···
 #include <linux/dma-mapping.h>
 #include <linux/clk.h>
 #include <linux/usb/otg.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/regulator/consumer.h>
 
 struct dwc3_exynos {
 	struct platform_device	*usb2_phy;
···
 	struct device		*dev;
 
 	struct clk		*clk;
+	struct regulator	*vdd33;
+	struct regulator	*vdd10;
 };
 
 static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
 {
-	struct usb_phy_gen_xceiv_platform_data pdata;
+	struct usb_phy_generic_platform_data pdata;
 	struct platform_device	*pdev;
 	int			ret;
 
 	memset(&pdata, 0x00, sizeof(pdata));
 
-	pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
+	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 	if (!pdev)
 		return -ENOMEM;
 
···
 	if (ret)
 		goto err1;
 
-	pdev = platform_device_alloc("usb_phy_gen_xceiv", PLATFORM_DEVID_AUTO);
+	pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
 	if (!pdev) {
 		ret = -ENOMEM;
 		goto err1;
···
 	struct device		*dev = &pdev->dev;
 	struct device_node	*node = dev->of_node;
 
-	int			ret = -ENOMEM;
+	int			ret;
 
 	exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
 	if (!exynos) {
 		dev_err(dev, "not enough memory\n");
-		goto err1;
+		return -ENOMEM;
 	}
 
 	/*
···
 	 */
 	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 	if (ret)
-		goto err1;
+		return ret;
 
 	platform_set_drvdata(pdev, exynos);
 
 	ret = dwc3_exynos_register_phys(exynos);
 	if (ret) {
 		dev_err(dev, "couldn't register PHYs\n");
-		goto err1;
+		return ret;
 	}
 
 	clk = devm_clk_get(dev, "usbdrd30");
 	if (IS_ERR(clk)) {
 		dev_err(dev, "couldn't get clock\n");
-		ret = -EINVAL;
-		goto err1;
+		return -EINVAL;
 	}
 
 	exynos->dev	= dev;
···
 
 	clk_prepare_enable(exynos->clk);
 
+	exynos->vdd33 = devm_regulator_get(dev, "vdd33");
+	if (IS_ERR(exynos->vdd33)) {
+		ret = PTR_ERR(exynos->vdd33);
+		goto err2;
+	}
+	ret = regulator_enable(exynos->vdd33);
+	if (ret) {
+		dev_err(dev, "Failed to enable VDD33 supply\n");
+		goto err2;
+	}
+
+	exynos->vdd10 = devm_regulator_get(dev, "vdd10");
+	if (IS_ERR(exynos->vdd10)) {
+		ret = PTR_ERR(exynos->vdd10);
+		goto err3;
+	}
+	ret = regulator_enable(exynos->vdd10);
+	if (ret) {
+		dev_err(dev, "Failed to enable VDD10 supply\n");
+		goto err3;
+	}
+
 	if (node) {
 		ret = of_platform_populate(node, NULL, NULL, dev);
 		if (ret) {
 			dev_err(dev, "failed to add dwc3 core\n");
-			goto err2;
+			goto err4;
 		}
 	} else {
 		dev_err(dev, "no device node, failed to add dwc3 core\n");
 		ret = -ENODEV;
-		goto err2;
+		goto err4;
 	}
 
 	return 0;
 
+err4:
+	regulator_disable(exynos->vdd10);
+err3:
+	regulator_disable(exynos->vdd33);
 err2:
 	clk_disable_unprepare(clk);
-err1:
 	return ret;
 }
 
···
 	platform_device_unregister(exynos->usb3_phy);
 
 	clk_disable_unprepare(exynos->clk);
+
+	regulator_disable(exynos->vdd33);
+	regulator_disable(exynos->vdd10);
 
 	return 0;
 }
···
 
 	clk_disable(exynos->clk);
 
+	regulator_disable(exynos->vdd33);
+	regulator_disable(exynos->vdd10);
+
 	return 0;
 }
 
 static int dwc3_exynos_resume(struct device *dev)
 {
 	struct dwc3_exynos *exynos = dev_get_drvdata(dev);
+	int ret;
+
+	ret = regulator_enable(exynos->vdd33);
+	if (ret) {
+		dev_err(dev, "Failed to enable VDD33 supply\n");
+		return ret;
+	}
+	ret = regulator_enable(exynos->vdd10);
+	if (ret) {
+		dev_err(dev, "Failed to enable VDD10 supply\n");
+		return ret;
+	}
 
 	clk_enable(exynos->clk);
 

drivers/usb/dwc3/dwc3-omap.c

···
 	struct extcon_dev	*edev;
 	struct regulator	*vbus_reg = NULL;
 
-	int			ret = -ENOMEM;
+	int			ret;
 	int			irq;
 
 	int			utmi_mode = 0;

drivers/usb/dwc3/dwc3-pci.c

···
 #include <linux/platform_device.h>
 
 #include <linux/usb/otg.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 
 /* FIXME define these in <linux/pci_ids.h> */
 #define PCI_VENDOR_ID_SYNOPSYS		0x16c3
···
 
 static int dwc3_pci_register_phys(struct dwc3_pci *glue)
 {
-	struct usb_phy_gen_xceiv_platform_data pdata;
+	struct usb_phy_generic_platform_data pdata;
 	struct platform_device	*pdev;
 	int			ret;
 
 	memset(&pdata, 0x00, sizeof(pdata));
 
-	pdev = platform_device_alloc("usb_phy_gen_xceiv", 0);
+	pdev = platform_device_alloc("usb_phy_generic", 0);
 	if (!pdev)
 		return -ENOMEM;
 
···
 	if (ret)
 		goto err1;
 
-	pdev = platform_device_alloc("usb_phy_gen_xceiv", 1);
+	pdev = platform_device_alloc("usb_phy_generic", 1);
 	if (!pdev) {
 		ret = -ENOMEM;
 		goto err1;
···
 	struct resource		res[2];
 	struct platform_device	*dwc3;
 	struct dwc3_pci		*glue;
-	int			ret = -ENOMEM;
+	int			ret;
 	struct device		*dev = &pci->dev;
 
 	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
···
 
 	glue->dev = dev;
 
-	ret = pci_enable_device(pci);
+	ret = pcim_enable_device(pci);
 	if (ret) {
 		dev_err(dev, "failed to enable pci device\n");
 		return -ENODEV;
···
 	dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
 	if (!dwc3) {
 		dev_err(dev, "couldn't allocate dwc3 device\n");
-		ret = -ENOMEM;
-		goto err1;
+		return -ENOMEM;
 	}
 
 	memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
···
 	ret = platform_device_add_resources(dwc3, res, ARRAY_SIZE(res));
 	if (ret) {
 		dev_err(dev, "couldn't add resources to dwc3 device\n");
-		goto err1;
+		return ret;
 	}
 
 	pci_set_drvdata(pci, glue);
···
 
 err3:
 	platform_device_put(dwc3);
-err1:
-	pci_disable_device(pci);
-
 	return ret;
 }
 
···
 	platform_device_unregister(glue->dwc3);
 	platform_device_unregister(glue->usb2_phy);
 	platform_device_unregister(glue->usb3_phy);
-	pci_disable_device(pci);
 }
 
 static const struct pci_device_id dwc3_pci_id_table[] = {

drivers/usb/dwc3/gadget.c

···
 	}
 }
 
+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)
 {
 	u32		timeout = 500;
 	u32		reg;
+
+	dev_vdbg(dwc->dev, "generic cmd '%s' [%d] param %08x\n",
+			dwc3_gadget_generic_cmd_string(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' params %08x %08x %08x\n",
+	dev_vdbg(dwc->dev, "%s: cmd '%s' [%d] params %08x %08x %08x\n",
 			dep->name,
-			dwc3_gadget_ep_cmd_string(cmd), params->param0,
+			dwc3_gadget_ep_cmd_string(cmd), cmd, params->param0,
 			params->param1, params->param2);
 
 	dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0);
···
 {
 	struct dwc3		*dwc = dep->dwc;
 	u32			reg;
-	int			ret = -ENOMEM;
+	int			ret;
 
 	dev_vdbg(dwc->dev, "Enabling %s\n", dep->name);
 
···
 	u32			reg;
 
 	dwc3_remove_requests(dwc, dep);
+
+	/* make sure HW endpoint isn't stalled */
+	if (dep->flags & DWC3_EP_STALL)
+		__dwc3_gadget_ep_set_halt(dep, 0);
 
 	reg = dwc3_readl(dwc->regs, DWC3_DALEPENA);
 	reg &= ~DWC3_DALEPENA_EP(dep->number);
···
 		}
 	}
 
-	dwc->link_state = next;
-
 	switch (next) {
 	case DWC3_LINK_STATE_U1:
 		if (dwc->speed == USB_SPEED_SUPER)
···
 		break;
 	}
 
-	dev_vdbg(dwc->dev, "%s link %d\n", __func__, dwc->link_state);
+	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_gadget_hibernation_interrupt(struct dwc3 *dwc,

drivers/usb/gadget/atmel_usba_udc.c

···
 		reset_all_endpoints(udc);
 
 		if (udc->gadget.speed != USB_SPEED_UNKNOWN
-				&& udc->driver->disconnect) {
+				&& udc->driver && udc->driver->disconnect) {
 			udc->gadget.speed = USB_SPEED_UNKNOWN;
 			spin_unlock(&udc->lock);
 			udc->driver->disconnect(&udc->gadget);

drivers/usb/gadget/composite.c

···
 #include <linux/usb/composite.h>
 #include <asm/unaligned.h>
 
+#include "u_os_desc.h"
+
+/**
+ * struct usb_os_string - represents OS String to be reported by a gadget
+ * @bLength: total length of the entire descritor, always 0x12
+ * @bDescriptorType: USB_DT_STRING
+ * @qwSignature: the OS String proper
+ * @bMS_VendorCode: code used by the host for subsequent requests
+ * @bPad: not used, must be zero
+ */
+struct usb_os_string {
+	__u8	bLength;
+	__u8	bDescriptorType;
+	__u8	qwSignature[OS_STRING_QW_SIGN_LEN];
+	__u8	bMS_VendorCode;
+	__u8	bPad;
+} __packed;
+
 /*
  * The code in this file is utility code, used to build a gadget driver
  * from one or more "function" drivers, one or more "configuration"
···
 {
 	struct usb_gadget		*gadget = cdev->gadget;
 	struct usb_configuration	*c;
+	struct list_head		*pos;
 	u8				type = w_value >> 8;
 	enum usb_device_speed		speed = USB_SPEED_UNKNOWN;
 
···
 
 	/* This is a lookup by config *INDEX* */
 	w_value &= 0xff;
-	list_for_each_entry(c, &cdev->configs, list) {
+
+	pos = &cdev->configs;
+	c = cdev->os_desc_config;
+	if (c)
+		goto check_config;
+
+	while ((pos = pos->next) !=  &cdev->configs) {
+		c = list_entry(pos, typeof(*c), list);
+
+		/* skip OS Descriptors config which is handled separately */
+		if (c == cdev->os_desc_config)
+			continue;
+
+check_config:
 		/* ignore configs that won't work at this speed */
 		switch (speed) {
 		case USB_SPEED_SUPER:
···
 	if (!c)
 		goto done;
 
+	usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
 	cdev->config = c;
 
 	/* Initialize all interfaces by setting them to altsetting zero. */
···
 		return s->bLength;
 	}
 
+	if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) {
+		struct usb_os_string *b = buf;
+		b->bLength = sizeof(*b);
+		b->bDescriptorType = USB_DT_STRING;
+		compiletime_assert(
+			sizeof(b->qwSignature) == sizeof(cdev->qw_sign),
+			"qwSignature size must be equal to qw_sign");
+		memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature));
+		b->bMS_VendorCode = cdev->b_vendor_code;
+		b->bPad = 0;
+		return sizeof(*b);
+	}
+
 	list_for_each_entry(uc, &cdev->gstrings, list) {
 		struct usb_gadget_strings **sp;
 
···
 				req->status, req->actual, req->length);
 }
 
+static int count_ext_compat(struct usb_configuration *c)
+{
+	int i, res;
+
+	res = 0;
+	for (i = 0; i < c->next_interface_id; ++i) {
+		struct usb_function *f;
+		int j;
+
+		f = c->interface[i];
+		for (j = 0; j < f->os_desc_n; ++j) {
+			struct usb_os_desc *d;
+
+			if (i != f->os_desc_table[j].if_id)
+				continue;
+			d = f->os_desc_table[j].os_desc;
+			if (d && d->ext_compat_id)
+				++res;
+		}
+	}
+	BUG_ON(res > 255);
+	return res;
+}
+
+static void fill_ext_compat(struct usb_configuration *c, u8 *buf)
+{
+	int i, count;
+
+	count = 16;
+	for (i = 0; i < c->next_interface_id; ++i) {
+		struct usb_function *f;
+		int j;
+
+		f = c->interface[i];
+		for (j = 0; j < f->os_desc_n; ++j) {
+			struct usb_os_desc *d;
+
+			if (i != f->os_desc_table[j].if_id)
+				continue;
+			d = f->os_desc_table[j].os_desc;
+			if (d && d->ext_compat_id) {
+				*buf++ = i;
+				*buf++ = 0x01;
+				memcpy(buf, d->ext_compat_id, 16);
+				buf += 22;
+			} else {
+				++buf;
+				*buf = 0x01;
+				buf += 23;
+			}
+			count += 24;
+			if (count >= 4096)
+				return;
+		}
+	}
+}
+
+static int count_ext_prop(struct usb_configuration *c, int interface)
+{
+	struct usb_function *f;
+	int j, res;
+
+	res = 0;
+
+	f = c->interface[interface];
+	for (j = 0; j < f->os_desc_n; ++j) {
+		struct usb_os_desc *d;
+
+		if (interface != f->os_desc_table[j].if_id)
+			continue;
+		d = f->os_desc_table[j].os_desc;
+		if (d && d->ext_compat_id)
+			return d->ext_prop_count;
+	}
+	return res;
+}
+
+static int len_ext_prop(struct usb_configuration *c, int interface)
+{
+	struct usb_function *f;
+	struct usb_os_desc *d;
+	int j, res;
+
+	res = 10; /* header length */
+	f = c->interface[interface];
+	for (j = 0; j < f->os_desc_n; ++j) {
+		if (interface != f->os_desc_table[j].if_id)
+			continue;
+		d = f->os_desc_table[j].os_desc;
+		if (d)
+			return min(res + d->ext_prop_len, 4096);
+	}
+	return res;
+}
+
+static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
+{
+	struct usb_function *f;
+	struct usb_os_desc *d;
+	struct usb_os_desc_ext_prop *ext_prop;
+	int j, count, n, ret;
+	u8 *start = buf;
+
+	f = c->interface[interface];
+	for (j = 0; j < f->os_desc_n; ++j) {
+		if (interface != f->os_desc_table[j].if_id)
+			continue;
+		d = f->os_desc_table[j].os_desc;
+		if (d)
+			list_for_each_entry(ext_prop, &d->ext_prop, entry) {
+				/* 4kB minus header length */
+				n = buf - start;
+				if (n >= 4086)
+					return 0;
+
+				count = ext_prop->data_len +
+					ext_prop->name_len + 14;
+				if (count > 4086 - n)
+					return -EINVAL;
+				usb_ext_prop_put_size(buf, count);
+				usb_ext_prop_put_type(buf, ext_prop->type);
+				ret = usb_ext_prop_put_name(buf, ext_prop->name,
+							    ext_prop->name_len);
+				if (ret < 0)
+					return ret;
+				switch (ext_prop->type) {
+				case USB_EXT_PROP_UNICODE:
+				case USB_EXT_PROP_UNICODE_ENV:
+				case USB_EXT_PROP_UNICODE_LINK:
+					usb_ext_prop_put_unicode(buf, ret,
+							 ext_prop->data,
+							 ext_prop->data_len);
+					break;
+				case USB_EXT_PROP_BINARY:
+					usb_ext_prop_put_binary(buf, ret,
+							ext_prop->data,
+							ext_prop->data_len);
+					break;
+				case USB_EXT_PROP_LE32:
+					/* not implemented */
+				case USB_EXT_PROP_BE32:
+					/* not implemented */
+				default:
+					return -EINVAL;
+				}
+				buf += count;
+			}
+	}
+
+	return 0;
+}
+
 /*
  * The setup() callback implements all the ep0 functionality that's
  * not handled lower down, in hardware or the hardware driver(like
···
 		break;
 	default:
 unknown:
+		/*
+		 * OS descriptors handling
+		 */
+		if (cdev->use_os_string && cdev->os_desc_config &&
+		    (ctrl->bRequest & USB_TYPE_VENDOR) &&
+		    ctrl->bRequest == cdev->b_vendor_code) {
+			struct usb_request		*req;
+			struct usb_configuration	*os_desc_cfg;
+			u8				*buf;
+			int				interface;
+			int				count = 0;
+
+			req = cdev->os_desc_req;
+			req->complete = composite_setup_complete;
+			buf = req->buf;
+			os_desc_cfg = cdev->os_desc_config;
+			memset(buf, 0, w_length);
+			buf[5] = 0x01;
+			switch (ctrl->bRequestType & USB_RECIP_MASK) {
+			case USB_RECIP_DEVICE:
+				if (w_index != 0x4 || (w_value >> 8))
+					break;
+				buf[6] = w_index;
+				if (w_length == 0x10) {
+					/* Number of ext compat interfaces */
+					count = count_ext_compat(os_desc_cfg);
+					buf[8] = count;
+					count *= 24; /* 24 B/ext compat desc */
+					count += 16; /* header */
+					put_unaligned_le32(count, buf);
+					value = w_length;
+				} else {
+					/* "extended compatibility ID"s */
+					count = count_ext_compat(os_desc_cfg);
+					buf[8] = count;
+					count *= 24; /* 24 B/ext compat desc */
+					count += 16; /* header */
+					put_unaligned_le32(count, buf);
+					buf += 16;
+					fill_ext_compat(os_desc_cfg, buf);
+					value = w_length;
+				}
+				break;
+			case USB_RECIP_INTERFACE:
+				if (w_index != 0x5 || (w_value >> 8))
+					break;
+				interface = w_value & 0xFF;
+				buf[6] = w_index;
+				if (w_length == 0x0A) {
+					count = count_ext_prop(os_desc_cfg,
+						interface);
+					put_unaligned_le16(count, buf + 8);
+					count = len_ext_prop(os_desc_cfg,
+						interface);
+					put_unaligned_le32(count, buf);
+
+					value = w_length;
+				} else {
+					count = count_ext_prop(os_desc_cfg,
+						interface);
+					put_unaligned_le16(count, buf + 8);
+					count = len_ext_prop(os_desc_cfg,
+						interface);
+					put_unaligned_le32(count, buf);
+					buf += 10;
+					value = fill_ext_prop(os_desc_cfg,
+							      interface, buf);
+					if (value < 0)
+						return value;
+
+					value = w_length;
+				}
+				break;
+			}
+			req->length = value;
+			req->zero = value < w_length;
+			value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
+			if (value < 0) {
+				DBG(cdev, "ep_queue --> %d\n", value);
+				req->status = 0;
+				composite_setup_complete(gadget->ep0, req);
+			}
+			return value;
+		}
+
 		VDBG(cdev,
 			"non-core control req%02x.%02x v%04x i%04x l%d\n",
 			ctrl->bRequestType, ctrl->bRequest,
···
 	return ret;
 }
 
+int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
+				  struct usb_ep *ep0)
+{
+	int ret = 0;
+
+	cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL);
+	if (!cdev->os_desc_req) {
+		ret = PTR_ERR(cdev->os_desc_req);
+		goto end;
+	}
+
+	/* OS feature descriptor length <= 4kB */
+	cdev->os_desc_req->buf = kmalloc(4096, GFP_KERNEL);
+	if (!cdev->os_desc_req->buf) {
+		ret = PTR_ERR(cdev->os_desc_req->buf);
+		kfree(cdev->os_desc_req);
+		goto end;
+	}
+	cdev->os_desc_req->complete = composite_setup_complete;
+end:
+	return ret;
+}
+
 void composite_dev_cleanup(struct usb_composite_dev *cdev)
 {
 	struct usb_gadget_string_container *uc, *tmp;
···
 	list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) {
 		list_del(&uc->list);
 		kfree(uc);
+	}
+	if (cdev->os_desc_req) {
+		kfree(cdev->os_desc_req->buf);
+		usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req);
 	}
 	if (cdev->req) {
 		kfree(cdev->req->buf);
···
 	status = composite->bind(cdev);
 	if (status < 0)
 		goto fail;
+
+	if (cdev->use_os_string) {
+		status = composite_os_desc_req_prepare(cdev, gadget->ep0);
+		if (status)
+			goto fail;
+	}
 
 	update_unchanged_dev_desc(&cdev->desc, composite->dev);
 

drivers/usb/gadget/configfs.c

···
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/device.h>
+#include <linux/nls.h>
 #include <linux/usb/composite.h>
 #include <linux/usb/gadget_configfs.h>
 #include "configfs.h"
+#include "u_f.h"
+#include "u_os_desc.h"
 
 int check_user_usb_string(const char *name,
 		struct usb_gadget_strings *stringtab_dev)
···
 	struct config_group functions_group;
 	struct config_group configs_group;
 	struct config_group strings_group;
-	struct config_group *default_groups[4];
+	struct config_group os_desc_group;
+	struct config_group *default_groups[5];
 
 	struct mutex lock;
 	struct usb_gadget_strings *gstrings[MAX_USB_STRING_LANGS + 1];
···
 #endif
 	struct usb_composite_driver composite;
 	struct usb_composite_dev cdev;
+	bool use_os_desc;
+	char b_vendor_code;
+	char qw_sign[OS_STRING_QW_SIGN_LEN];
 };
 
 struct config_usb_cfg {
···
 
 	struct config_group group;
 	struct list_head list;
+};
+
+struct os_desc {
+	struct config_group group;
 };
 
 struct gadget_config_name {
···
 USB_CONFIG_STRING_RW_OPS(gadget_strings);
 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
 
+static inline struct os_desc *to_os_desc(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct os_desc, group);
+}
+
+CONFIGFS_ATTR_STRUCT(os_desc);
+CONFIGFS_ATTR_OPS(os_desc);
+
+static ssize_t os_desc_use_show(struct os_desc *os_desc, char *page)
+{
+	struct gadget_info *gi;
+
+	gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+	return sprintf(page, "%d", gi->use_os_desc);
+}
+
+static ssize_t os_desc_use_store(struct os_desc *os_desc, const char *page,
+				 size_t len)
+{
+	struct gadget_info *gi;
+	int ret;
+	bool use;
+
+	gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+	mutex_lock(&gi->lock);
+	ret = strtobool(page, &use);
+	if (!ret) {
+		gi->use_os_desc = use;
+		ret = len;
+	}
+	mutex_unlock(&gi->lock);
+
+	return ret;
+}
+
+static struct os_desc_attribute os_desc_use =
+	__CONFIGFS_ATTR(use, S_IRUGO | S_IWUSR,
+			os_desc_use_show,
+			os_desc_use_store);
+
+static ssize_t os_desc_b_vendor_code_show(struct os_desc *os_desc, char *page)
+{
+	struct gadget_info *gi;
+
+	gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+	return sprintf(page, "%d", gi->b_vendor_code);
+}
+
+static ssize_t os_desc_b_vendor_code_store(struct os_desc *os_desc,
+					   const char *page, size_t len)
+{
+	struct gadget_info *gi;
+	int ret;
+	u8 b_vendor_code;
+
+	gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+	mutex_lock(&gi->lock);
+	ret = kstrtou8(page, 0, &b_vendor_code);
+	if (!ret) {
+		gi->b_vendor_code = b_vendor_code;
+		ret = len;
+	}
+	mutex_unlock(&gi->lock);
+
+	return ret;
+}
+
+static struct os_desc_attribute os_desc_b_vendor_code =
+	__CONFIGFS_ATTR(b_vendor_code, S_IRUGO | S_IWUSR,
+			os_desc_b_vendor_code_show,
+			os_desc_b_vendor_code_store);
+
+static ssize_t os_desc_qw_sign_show(struct os_desc *os_desc, char *page)
+{
+	struct gadget_info *gi;
+
+	gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+
+	memcpy(page, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
+
+	return OS_STRING_QW_SIGN_LEN;
+}
+
+static ssize_t os_desc_qw_sign_store(struct os_desc *os_desc, const char *page,
+				     size_t len)
+{
+	struct gadget_info *gi;
+	int res, l;
+
+	gi = to_gadget_info(os_desc->group.cg_item.ci_parent);
+	l = min((int)len, OS_STRING_QW_SIGN_LEN >> 1);
+	if (page[l - 1] == '\n')
+		--l;
+
+	mutex_lock(&gi->lock);
+	res = utf8s_to_utf16s(page, l,
+			      UTF16_LITTLE_ENDIAN, (wchar_t *) gi->qw_sign,
+			      OS_STRING_QW_SIGN_LEN);
+	if (res > 0)
+		res = len;
+	mutex_unlock(&gi->lock);
+
+	return res;
+}
+
+static struct os_desc_attribute os_desc_qw_sign =
+	__CONFIGFS_ATTR(qw_sign, S_IRUGO | S_IWUSR,
+			os_desc_qw_sign_show,
+			os_desc_qw_sign_store);
+
+static struct configfs_attribute *os_desc_attrs[] = {
+	&os_desc_use.attr,
+	&os_desc_b_vendor_code.attr,
+	&os_desc_qw_sign.attr,
+	NULL,
+};
+
+static void os_desc_attr_release(struct config_item *item)
+{
+	struct os_desc *os_desc = to_os_desc(item);
+	kfree(os_desc);
+}
+
+static int os_desc_link(struct config_item *os_desc_ci,
+			struct config_item *usb_cfg_ci)
+{
+	struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
+					struct gadget_info, os_desc_group);
+	struct usb_composite_dev *cdev = &gi->cdev;
+	struct config_usb_cfg *c_target =
+		container_of(to_config_group(usb_cfg_ci),
+			     struct config_usb_cfg, group);
+	struct usb_configuration *c;
+	int ret;
+
+	mutex_lock(&gi->lock);
+	list_for_each_entry(c, &cdev->configs, list) {
+		if (c == &c_target->c)
+			break;
+	}
+	if (c != &c_target->c) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (cdev->os_desc_config) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	cdev->os_desc_config = &c_target->c;
+	ret = 0;
+
+out:
+	mutex_unlock(&gi->lock);
+	return ret;
+}
+
+static int os_desc_unlink(struct config_item *os_desc_ci,
+			  struct config_item *usb_cfg_ci)
+{
+	struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
+					struct gadget_info, os_desc_group);
+	struct usb_composite_dev *cdev = &gi->cdev;
+
+	mutex_lock(&gi->lock);
+	if (gi->udc_name)
+		unregister_gadget(gi);
+	cdev->os_desc_config = NULL;
+	WARN_ON(gi->udc_name);
+	mutex_unlock(&gi->lock);
+	return 0;
+}
+
+static struct configfs_item_operations os_desc_ops = {
+	.release                = os_desc_attr_release,
+	.show_attribute         = os_desc_attr_show,
+	.store_attribute        = os_desc_attr_store,
+	.allow_link		= os_desc_link,
+	.drop_link		= os_desc_unlink,
+};
+
+static struct config_item_type os_desc_type = {
+	.ct_item_ops	= &os_desc_ops,
+	.ct_attrs	= os_desc_attrs,
+	.ct_owner	= THIS_MODULE,
+};
+
+CONFIGFS_ATTR_STRUCT(usb_os_desc);
+CONFIGFS_ATTR_OPS(usb_os_desc);
+
+
+static inline struct usb_os_desc_ext_prop
+*to_usb_os_desc_ext_prop(struct config_item *item)
+{
+	return container_of(item, struct usb_os_desc_ext_prop, item);
+}
+
+CONFIGFS_ATTR_STRUCT(usb_os_desc_ext_prop);
+CONFIGFS_ATTR_OPS(usb_os_desc_ext_prop);
+
+static ssize_t ext_prop_type_show(struct usb_os_desc_ext_prop *ext_prop,
+				  char *page)
+{
+	return sprintf(page, "%d", ext_prop->type);
+}
+
+static ssize_t ext_prop_type_store(struct usb_os_desc_ext_prop *ext_prop,
+				   const char *page, size_t len)
+{
+	struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
+	u8 type;
+	int ret;
+
+	if (desc->opts_mutex)
+		mutex_lock(desc->opts_mutex);
+	ret = kstrtou8(page, 0, &type);
+	if (ret)
+		goto end;
+	if (type < USB_EXT_PROP_UNICODE || type > USB_EXT_PROP_UNICODE_MULTI) {
+		ret = -EINVAL;
+		goto end;
+	}
+
+	if ((ext_prop->type == USB_EXT_PROP_BINARY ||
+	    ext_prop->type == USB_EXT_PROP_LE32 ||
+	    ext_prop->type == USB_EXT_PROP_BE32) &&
+	    (type == USB_EXT_PROP_UNICODE ||
+	    type == USB_EXT_PROP_UNICODE_ENV ||
+	    type == USB_EXT_PROP_UNICODE_LINK))
+		ext_prop->data_len <<= 1;
+	else if ((ext_prop->type == USB_EXT_PROP_UNICODE ||
+		   ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
+		   ext_prop->type == USB_EXT_PROP_UNICODE_LINK) &&
+		   (type == USB_EXT_PROP_BINARY ||
+		   type == USB_EXT_PROP_LE32 ||
+		   type == USB_EXT_PROP_BE32))
+		ext_prop->data_len >>= 1;
+	ext_prop->type = type;
+	ret = len;
+
+end:
+	if (desc->opts_mutex)
+		mutex_unlock(desc->opts_mutex);
+	return ret;
+}
+
+static ssize_t ext_prop_data_show(struct usb_os_desc_ext_prop *ext_prop,
+				  char *page)
+{
+	int len = ext_prop->data_len;
+
+	if (ext_prop->type == USB_EXT_PROP_UNICODE ||
+	    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
+	    ext_prop->type == USB_EXT_PROP_UNICODE_LINK)
+		len >>= 1;
+	memcpy(page, ext_prop->data, len);
+
+	return len;
+}
+
+static ssize_t ext_prop_data_store(struct usb_os_desc_ext_prop *ext_prop,
+				   const char *page, size_t len)
+{
+	struct usb_os_desc *desc = to_usb_os_desc(ext_prop->item.ci_parent);
+	char *new_data;
+	size_t ret_len = len;
+
+	if (page[len - 1] == '\n' || page[len - 1] == '\0')
+		--len;
+	new_data = kzalloc(len, GFP_KERNEL);
+	if (!new_data)
+		return -ENOMEM;
+
+	memcpy(new_data, page, len);
+
+	if (desc->opts_mutex)
+		mutex_lock(desc->opts_mutex);
+	kfree(ext_prop->data);
+	ext_prop->data = new_data;
+	desc->ext_prop_len -= ext_prop->data_len;
+	ext_prop->data_len = len;
+	desc->ext_prop_len += ext_prop->data_len;
+	if (ext_prop->type == USB_EXT_PROP_UNICODE ||
+	    ext_prop->type == USB_EXT_PROP_UNICODE_ENV ||
+	    ext_prop->type == USB_EXT_PROP_UNICODE_LINK) {
+		desc->ext_prop_len -= ext_prop->data_len;
+		ext_prop->data_len <<= 1;
+		ext_prop->data_len += 2;
+		desc->ext_prop_len += ext_prop->data_len;
+	}
+	if (desc->opts_mutex)
+		mutex_unlock(desc->opts_mutex);
+	return ret_len;
+}
+
+static struct usb_os_desc_ext_prop_attribute ext_prop_type =
+	__CONFIGFS_ATTR(type, S_IRUGO | S_IWUSR,
+			ext_prop_type_show, ext_prop_type_store);
+
+static struct usb_os_desc_ext_prop_attribute ext_prop_data =
+	__CONFIGFS_ATTR(data, S_IRUGO | S_IWUSR,
+			ext_prop_data_show, ext_prop_data_store);
+
+static struct configfs_attribute *ext_prop_attrs[] = {
+	&ext_prop_type.attr,
+	&ext_prop_data.attr,
+	NULL,
+};
+
+static void usb_os_desc_ext_prop_release(struct config_item *item)
+{
+	struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
+
+	kfree(ext_prop); /* frees a whole chunk */
+}
+
+static struct configfs_item_operations ext_prop_ops = {
+	.release		= usb_os_desc_ext_prop_release,
+	.show_attribute		= usb_os_desc_ext_prop_attr_show,
+	.store_attribute	= usb_os_desc_ext_prop_attr_store,
+};
+
+static struct config_item *ext_prop_make(
+		struct config_group *group,
+		const char *name)
+{
+	struct usb_os_desc_ext_prop *ext_prop;
+	struct config_item_type *ext_prop_type;
+	struct usb_os_desc *desc;
+	char *vlabuf;
+
+	vla_group(data_chunk);
+	vla_item(data_chunk, struct usb_os_desc_ext_prop, ext_prop, 1);
+	vla_item(data_chunk, struct config_item_type, ext_prop_type, 1);
+
+	vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
+	if (!vlabuf)
+		return ERR_PTR(-ENOMEM);
+
+	ext_prop = vla_ptr(vlabuf, data_chunk, ext_prop);
+	ext_prop_type = vla_ptr(vlabuf, data_chunk, ext_prop_type);
+
+	desc = container_of(group, struct usb_os_desc, group);
+	ext_prop_type->ct_item_ops = &ext_prop_ops;
+	ext_prop_type->ct_attrs = ext_prop_attrs;
+	ext_prop_type->ct_owner = desc->owner;
+
+	config_item_init_type_name(&ext_prop->item, name, ext_prop_type);
+
+	ext_prop->name = kstrdup(name, GFP_KERNEL);
+	if (!ext_prop->name) {
+		kfree(vlabuf);
+		return ERR_PTR(-ENOMEM);
+	}
+	desc->ext_prop_len += 14;
+	ext_prop->name_len = 2 * strlen(ext_prop->name) + 2;
+	if (desc->opts_mutex)
+		mutex_lock(desc->opts_mutex);
+	desc->ext_prop_len += ext_prop->name_len;
+	list_add_tail(&ext_prop->entry, &desc->ext_prop);
+	++desc->ext_prop_count;
+	if (desc->opts_mutex)
+		mutex_unlock(desc->opts_mutex);
+
+	return &ext_prop->item;
+}
+
+static void ext_prop_drop(struct config_group *group, struct config_item *item)
+{
+	struct usb_os_desc_ext_prop *ext_prop = to_usb_os_desc_ext_prop(item);
+	struct usb_os_desc *desc = to_usb_os_desc(&group->cg_item);
+
+	if (desc->opts_mutex)
+		mutex_lock(desc->opts_mutex);
+	list_del(&ext_prop->entry);
+	--desc->ext_prop_count;
+	kfree(ext_prop->name);
+	desc->ext_prop_len -= (ext_prop->name_len + ext_prop->data_len + 14);
+	if (desc->opts_mutex)
+		mutex_unlock(desc->opts_mutex);
+	config_item_put(item);
+}
+
+static struct configfs_group_operations interf_grp_ops = {
+	.make_item	= &ext_prop_make,
+	.drop_item	= &ext_prop_drop,
+};
+
+static struct configfs_item_operations interf_item_ops = {
+	.show_attribute		= usb_os_desc_attr_show,
+	.store_attribute	= usb_os_desc_attr_store,
+};
+
+static ssize_t rndis_grp_compatible_id_show(struct usb_os_desc *desc,
+					    char *page)
+{
+	memcpy(page, desc->ext_compat_id, 8);
+	return 8;
+}
+
+static ssize_t rndis_grp_compatible_id_store(struct usb_os_desc *desc,
+					     const char *page, size_t len)
+{
+	int l;
+
+	l = min_t(int, 8, len);
+	if (page[l - 1] == '\n')
+		--l;
+	if (desc->opts_mutex)
+		mutex_lock(desc->opts_mutex);
+	memcpy(desc->ext_compat_id, page, l);
+	desc->ext_compat_id[l] = '\0';
+
+	if (desc->opts_mutex)
+		mutex_unlock(desc->opts_mutex);
+
+	return len;
+}
+
+static struct usb_os_desc_attribute rndis_grp_attr_compatible_id =
+	__CONFIGFS_ATTR(compatible_id, S_IRUGO | S_IWUSR,
+			rndis_grp_compatible_id_show,
+			rndis_grp_compatible_id_store);
+
+static ssize_t rndis_grp_sub_compatible_id_show(struct usb_os_desc *desc,
+						char *page)
+{
+	memcpy(page, desc->ext_compat_id + 8, 8);
+	return 8;
+}
+
+static ssize_t rndis_grp_sub_compatible_id_store(struct usb_os_desc *desc,
+						 const char *page, size_t len)
+{
+	int l;
+
+	l = min_t(int, 8, len);
+	if (page[l - 1] == '\n')
+		--l;
+	if (desc->opts_mutex)
+		mutex_lock(desc->opts_mutex);
+	memcpy(desc->ext_compat_id + 8, page, l);
+	desc->ext_compat_id[l + 8] = '\0';
+
+	if (desc->opts_mutex)
+		mutex_unlock(desc->opts_mutex);
+
+	return len;
+}
+
+static struct usb_os_desc_attribute rndis_grp_attr_sub_compatible_id =
+	__CONFIGFS_ATTR(sub_compatible_id, S_IRUGO | S_IWUSR,
+			rndis_grp_sub_compatible_id_show,
+			rndis_grp_sub_compatible_id_store);
+
+static struct configfs_attribute *interf_grp_attrs[] = {
+	&rndis_grp_attr_compatible_id.attr,
+	&rndis_grp_attr_sub_compatible_id.attr,
+	NULL
+};
+
+int usb_os_desc_prepare_interf_dir(struct config_group *parent,
+				   int n_interf,
+				   struct usb_os_desc **desc,
+				   struct module *owner)
+{
+	struct config_group **f_default_groups, *os_desc_group,
+				**interface_groups;
+	struct config_item_type *os_desc_type, *interface_type;
+
+	vla_group(data_chunk);
+	vla_item(data_chunk, struct config_group *, f_default_groups, 2);
+	vla_item(data_chunk, struct config_group, os_desc_group, 1);
+	vla_item(data_chunk, struct config_group *, interface_groups,
+		 n_interf + 1);
+	vla_item(data_chunk, struct config_item_type, os_desc_type, 1);
+	vla_item(data_chunk, struct config_item_type, interface_type, 1);
+
+	char *vlabuf = kzalloc(vla_group_size(data_chunk), GFP_KERNEL);
+	if (!vlabuf)
+		return -ENOMEM;
+
+	f_default_groups = vla_ptr(vlabuf, data_chunk, f_default_groups);
+	os_desc_group = vla_ptr(vlabuf, data_chunk, os_desc_group);
+	os_desc_type = vla_ptr(vlabuf, data_chunk, os_desc_type);
+	interface_groups = vla_ptr(vlabuf, data_chunk, interface_groups);
+	interface_type = vla_ptr(vlabuf, data_chunk, interface_type);
+
+	parent->default_groups = f_default_groups;
+	os_desc_type->ct_owner = owner;
+	config_group_init_type_name(os_desc_group, "os_desc", os_desc_type);
+	f_default_groups[0] = os_desc_group;
+
+	os_desc_group->default_groups = interface_groups;
+	interface_type->ct_item_ops = &interf_item_ops;
+	interface_type->ct_group_ops = &interf_grp_ops;
+	interface_type->ct_attrs = interf_grp_attrs;
+	interface_type->ct_owner = owner;
+
+	while (n_interf--) {
+		struct usb_os_desc *d;
+
+		d = desc[n_interf];
+		d->owner = owner;
+		config_group_init_type_name(&d->group, "", interface_type);
+		config_item_set_name(&d->group.cg_item, "interface.%d",
+				     n_interf);
+		interface_groups[n_interf] = &d->group;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(usb_os_desc_prepare_interf_dir);
+
 static int configfs_do_nothing(struct usb_composite_dev *cdev)
 {
 	WARN_ON(1);
···
 
 int composite_dev_prepare(struct usb_composite_driver *composite,
 		struct usb_composite_dev *dev);
+
+int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
+				  struct usb_ep *ep0);
 
 static void purge_configs_funcs(struct gadget_info *gi)
 {
···
 	ret = -EINVAL;
 
 	if (list_empty(&gi->cdev.configs)) {
-		pr_err("Need atleast one configuration in %s.\n",
+		pr_err("Need at least one configuration in %s.\n",
 				gi->composite.name);
 		goto err_comp_cleanup;
 	}
···
 
 		cfg = container_of(c, struct config_usb_cfg, c);
 		if (list_empty(&cfg->func_list)) {
-			pr_err("Config %s/%d of %s needs atleast one function.\n",
+			pr_err("Config %s/%d of %s needs at least one function.\n",
 			      c->label, c->bConfigurationValue,
 			      gi->composite.name);
 			goto err_comp_cleanup;
···
 		gi->cdev.desc.iManufacturer = s[USB_GADGET_MANUFACTURER_IDX].id;
 		gi->cdev.desc.iProduct = s[USB_GADGET_PRODUCT_IDX].id;
 		gi->cdev.desc.iSerialNumber = s[USB_GADGET_SERIAL_IDX].id;
+	}
+
+	if (gi->use_os_desc) {
+		cdev->use_os_string = true;
+		cdev->b_vendor_code = gi->b_vendor_code;
+		memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
 	}
 
 	/* Go through all configs, attach all functions */
···
 		}
 		usb_ep_autoconfig_reset(cdev->gadget);
 	}
+	if (cdev->use_os_string) {
+		ret = composite_os_desc_req_prepare(cdev, gadget->ep0);
+		if (ret)
+			goto err_purge_funcs;
+	}
+
 	usb_ep_autoconfig_reset(cdev->gadget);
 	return 0;
 
···
 	gi->group.default_groups[0] = &gi->functions_group;
 	gi->group.default_groups[1] = &gi->configs_group;
 	gi->group.default_groups[2] = &gi->strings_group;
+	gi->group.default_groups[3] = &gi->os_desc_group;
 
 	config_group_init_type_name(&gi->functions_group, "functions",
 			&functions_type);
···
 			&config_desc_type);
 	config_group_init_type_name(&gi->strings_group, "strings",
 			&gadget_strings_strings_type);
+	config_group_init_type_name(&gi->os_desc_group, "os_desc",
+			&os_desc_type);
 
 	gi->composite.bind = configfs_do_nothing;
 	gi->composite.unbind = configfs_do_nothing;
···
 
 	unregister_gadget(gi);
 }
-EXPORT_SYMBOL(unregister_gadget_item);
+EXPORT_SYMBOL_GPL(unregister_gadget_item);
 
 static int __init gadget_cfs_init(void)
 {

drivers/usb/gadget/configfs.h

···
 #ifndef USB__GADGET__CONFIGFS__H
 #define USB__GADGET__CONFIGFS__H
 
+#include <linux/configfs.h>
+
 void unregister_gadget_item(struct config_item *item);
+
+int usb_os_desc_prepare_interf_dir(struct config_group *parent,
+				   int n_interf,
+				   struct usb_os_desc **desc,
+				   struct module *owner);
+
+static inline struct usb_os_desc *to_usb_os_desc(struct config_item *item)
+{
+	return container_of(to_config_group(item), struct usb_os_desc, group);
+}
 
 #endif /*  USB__GADGET__CONFIGFS__H */

drivers/usb/gadget/f_fs.c

···
 #include <linux/poll.h>
 
 #include "u_fs.h"
+#include "u_f.h"
 #include "configfs.h"
 
 #define FUNCTIONFS_MAGIC	0xa647361 /* Chosen by a honest dice roll ;) */
-
-/* Variable Length Array Macros **********************************************/
-#define vla_group(groupname) size_t groupname##__next = 0
-#define vla_group_size(groupname) groupname##__next
-
-#define vla_item(groupname, type, name, n) \
-	size_t groupname##_##name##__offset = ({			       \
-		size_t align_mask = __alignof__(type) - 1;		       \
-		size_t offset = (groupname##__next + align_mask) & ~align_mask;\
-		size_t size = (n) * sizeof(type);			       \
-		groupname##__next = offset + size;			       \
-		offset;							       \
-	})
-
-#define vla_item_with_sz(groupname, type, name, n) \
-	size_t groupname##_##name##__sz = (n) * sizeof(type);		       \
-	size_t groupname##_##name##__offset = ({			       \
-		size_t align_mask = __alignof__(type) - 1;		       \
-		size_t offset = (groupname##__next + align_mask) & ~align_mask;\
-		size_t size = groupname##_##name##__sz;			       \
-		groupname##__next = offset + size;			       \
-		offset;							       \
-	})
-
-#define vla_ptr(ptr, groupname, name) \
-	((void *) ((char *)ptr + groupname##_##name##__offset))
 
 /* Reference counter handling */
 static void ffs_data_get(struct ffs_data *ffs);
···
 /* Devices management *******************************************************/
 
 DEFINE_MUTEX(ffs_lock);
-EXPORT_SYMBOL(ffs_lock);
+EXPORT_SYMBOL_GPL(ffs_lock);
 
 static struct ffs_dev *_ffs_find_dev(const char *name);
 static struct ffs_dev *_ffs_alloc_dev(void);
···
 
 	return ret;
 }
-EXPORT_SYMBOL(ffs_name_dev);
+EXPORT_SYMBOL_GPL(ffs_name_dev);
 
 int ffs_single_dev(struct ffs_dev *dev)
 {
···
 	ffs_dev_unlock();
 	return ret;
 }
-EXPORT_SYMBOL(ffs_single_dev);
+EXPORT_SYMBOL_GPL(ffs_single_dev);
 
 /*
  * ffs_lock must be taken by the caller of this function

drivers/usb/gadget/f_rndis.c

···
 #include "u_ether_configfs.h"
 #include "u_rndis.h"
 #include "rndis.h"
+#include "configfs.h"
 
 /*
  * This function is an RNDIS Ethernet port -- a Microsoft protocol that's
···
 
 	rndis_opts = container_of(f->fi, struct f_rndis_opts, func_inst);
 
+	if (cdev->use_os_string) {
+		f->os_desc_table = kzalloc(sizeof(*f->os_desc_table),
+					   GFP_KERNEL);
+		if (!f->os_desc_table)
+			return PTR_ERR(f->os_desc_table);
+		f->os_desc_n = 1;
+		f->os_desc_table[0].os_desc = &rndis_opts->rndis_os_desc;
+	}
+
 	/*
 	 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
 	 * configurations are bound in sequence with list_for_each_entry,
···
 		gether_set_gadget(rndis_opts->net, cdev->gadget);
 		status = gether_register_netdev(rndis_opts->net);
 		if (status)
-			return status;
+			goto fail;
 		rndis_opts->bound = true;
 	}
 
 	us = usb_gstrings_attach(cdev, rndis_strings,
 				 ARRAY_SIZE(rndis_string_defs));
-	if (IS_ERR(us))
-		return PTR_ERR(us);
+	if (IS_ERR(us)) {
+		status = PTR_ERR(us);
+		goto fail;
+	}
 	rndis_control_intf.iInterface = us[0].id;
 	rndis_data_intf.iInterface = us[1].id;
 	rndis_iad_descriptor.iFunction = us[2].id;
···
 	return 0;
 
 fail:
+	kfree(f->os_desc_table);
+	f->os_desc_n = 0;
 	usb_free_all_descriptors(f);
 
 	if (rndis->notify_req) {
···
 	opts->borrowed_net = opts->bound = true;
 	opts->net = net;
 }
-EXPORT_SYMBOL(rndis_borrow_net);
+EXPORT_SYMBOL_GPL(rndis_borrow_net);
 
 static inline struct f_rndis_opts *to_f_rndis_opts(struct config_item *item)
 {
···
 		else
 			free_netdev(opts->net);
 	}
+
+	kfree(opts->rndis_os_desc.group.default_groups); /* single VLA chunk */
 	kfree(opts);
 }
 
 static struct usb_function_instance *rndis_alloc_inst(void)
 {
 	struct f_rndis_opts *opts;
+	struct usb_os_desc *descs[1];
 
 	opts = kzalloc(sizeof(*opts), GFP_KERNEL);
 	if (!opts)
 		return ERR_PTR(-ENOMEM);
+	opts->rndis_os_desc.ext_compat_id = opts->rndis_ext_compat_id;
+
 	mutex_init(&opts->lock);
 	opts->func_inst.free_func_inst = rndis_free_inst;
 	opts->net = gether_setup_default();
···
 		kfree(opts);
 		return ERR_CAST(net);
 	}
+	INIT_LIST_HEAD(&opts->rndis_os_desc.ext_prop);
 
+	descs[0] = &opts->rndis_os_desc;
+	usb_os_desc_prepare_interf_dir(&opts->func_inst.group, 1, descs,
+				       THIS_MODULE);
 	config_group_init_type_name(&opts->func_inst.group, "",
 				    &rndis_func_type);
 
···
 {
 	struct f_rndis		*rndis = func_to_rndis(f);
 
+	kfree(f->os_desc_table);
+	f->os_desc_n = 0;
 	usb_free_all_descriptors(f);
 
 	kfree(rndis->notify_req->buf);

drivers/usb/gadget/f_subset.c

···
 	}
 
 	net = gether_connect(&geth->port);
-	return PTR_RET(net);
+	return PTR_ERR_OR_ZERO(net);
 }
 
 static void geth_disable(struct usb_function *f)

drivers/usb/gadget/f_uac2.c

···
 	struct snd_uac2_chip *uac2 = prm->uac2;
 
 	/* i/f shutting down */
-	if (!prm->ep_enabled)
+	if (!prm->ep_enabled || req->status == -ESHUTDOWN)
 		return;
 
 	/*
···
 	prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
 	if (!prm->rbuf) {
 		prm->max_psize = 0;
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
 		goto err;
 	}
 
···
 	prm->rbuf = kzalloc(prm->max_psize * USB_XFERS, GFP_KERNEL);
 	if (!prm->rbuf) {
 		prm->max_psize = 0;
-		dev_err(&uac2->pdev.dev,
-			"%s:%d Error!\n", __func__, __LINE__);
 		goto err;
 	}
 
···
 	int res;
 
 	agdev_g = kzalloc(sizeof *agdev_g, GFP_KERNEL);
-	if (agdev_g == NULL) {
-		printk(KERN_ERR "Unable to allocate audio gadget\n");
+	if (agdev_g == NULL)
 		return -ENOMEM;
-	}
 
 	res = usb_string_ids_tab(cfg->cdev, strings_fn);
 	if (res)

drivers/usb/gadget/fotg210-udc.c

···
 
 	/* initialize udc */
 	fotg210 = kzalloc(sizeof(struct fotg210_udc), GFP_KERNEL);
-	if (fotg210 == NULL) {
-		pr_err("kzalloc error\n");
+	if (fotg210 == NULL)
 		goto err_alloc;
-	}
 
 	for (i = 0; i < FOTG210_MAX_NUM_EP; i++) {
 		_ep[i] = kzalloc(sizeof(struct fotg210_ep), GFP_KERNEL);
-		if (_ep[i] == NULL) {
-			pr_err("_ep kzalloc error\n");
+		if (_ep[i] == NULL)
 			goto err_alloc;
-		}
 		fotg210->ep[i] = _ep[i];
 	}
 

drivers/usb/gadget/fsl_udc_core.c

···
 	udc->phy_mode = pdata->phy_mode;
 
 	udc->eps = kzalloc(sizeof(struct fsl_ep) * udc->max_ep, GFP_KERNEL);
-	if (!udc->eps) {
-		ERR("malloc fsl_ep failed\n");
+	if (!udc->eps)
 		return -1;
-	}
 
 	/* initialized QHs, take care of alignment */
 	size = udc->max_ep * sizeof(struct ep_queue_head);
···
 	u32 dccparams;
 
 	udc_controller = kzalloc(sizeof(struct fsl_udc), GFP_KERNEL);
-	if (udc_controller == NULL) {
-		ERR("malloc udc failed\n");
+	if (udc_controller == NULL)
 		return -ENOMEM;
-	}
 
 	pdata = dev_get_platdata(&pdev->dev);
 	udc_controller->pdata = pdata;

drivers/usb/gadget/fusb300_udc.c

···
 
 	/* initialize udc */
 	fusb300 = kzalloc(sizeof(struct fusb300), GFP_KERNEL);
-	if (fusb300 == NULL) {
-		pr_err("kzalloc error\n");
+	if (fusb300 == NULL)
 		goto clean_up;
-	}
 
 	for (i = 0; i < FUSB300_MAX_NUM_EP; i++) {
 		_ep[i] = kzalloc(sizeof(struct fusb300_ep), GFP_KERNEL);
-		if (_ep[i] == NULL) {
-			pr_err("_ep kzalloc error\n");
+		if (_ep[i] == NULL)
 			goto clean_up;
-		}
 		fusb300->ep[i] = _ep[i];
 	}
 

drivers/usb/gadget/gr_udc.c

···
 	seq_printf(seq, "  wedged = %d\n", ep->wedged);
 	seq_printf(seq, "  callback = %d\n", ep->callback);
 	seq_printf(seq, "  maxpacket = %d\n", ep->ep.maxpacket);
+	seq_printf(seq, "  maxpacket_limit = %d\n", ep->ep.maxpacket_limit);
 	seq_printf(seq, "  bytes_per_buffer = %d\n", ep->bytes_per_buffer);
 	if (mode == 1 || mode == 3)
 		seq_printf(seq, "  nt = %d\n",
···
 	} else if (max == 0) {
 		dev_err(dev->dev, "Max payload cannot be set to 0\n");
 		return -EINVAL;
+	} else if (max > ep->ep.maxpacket_limit) {
+		dev_err(dev->dev, "Requested max payload %d > limit %d\n",
+			max, ep->ep.maxpacket_limit);
+		return -EINVAL;
 	}
 
 	spin_lock(&ep->dev->lock);
···
 	if (ep->is_in)
 		gr_dbgprint_request("EXTERN", ep, req);
 
-	ret = gr_queue(ep, req, gfp_flags);
+	ret = gr_queue(ep, req, GFP_ATOMIC);
 
 	spin_unlock(&ep->dev->lock);
 
···
 	INIT_LIST_HEAD(&ep->queue);
 
 	if (num == 0) {
-		_req = gr_alloc_request(&ep->ep, GFP_KERNEL);
-		buf = devm_kzalloc(dev->dev, PAGE_SIZE, GFP_DMA | GFP_KERNEL);
+		_req = gr_alloc_request(&ep->ep, GFP_ATOMIC);
+		buf = devm_kzalloc(dev->dev, PAGE_SIZE, GFP_DMA | GFP_ATOMIC);
 		if (!_req || !buf) {
 			/* possible _req freed by gr_probe via gr_remove */
 			return -ENOMEM;
···
 	u32 dmactrl_val;
 	int i;
 	int ret = 0;
-	u32 *bufsizes;
 	u32 bufsize;
-	int len;
 
 	gr_set_address(dev, 0);
 
···
 	INIT_LIST_HEAD(&dev->ep_list);
 	gr_set_ep0state(dev, GR_EP0_DISCONNECT);
 
-	bufsizes = (u32 *)of_get_property(np, "epobufsizes", &len);
-	len /= sizeof(u32);
 	for (i = 0; i < dev->nepo; i++) {
-		bufsize = (bufsizes && i < len) ? bufsizes[i] : 1024;
+		if (of_property_read_u32_index(np, "epobufsizes", i, &bufsize))
+			bufsize = 1024;
 		ret = gr_ep_init(dev, i, 0, bufsize);
 		if (ret)
 			return ret;
 	}
 
-	bufsizes = (u32 *)of_get_property(np, "epibufsizes", &len);
-	len /= sizeof(u32);
 	for (i = 0; i < dev->nepi; i++) {
-		bufsize = (bufsizes && i < len) ? bufsizes[i] : 1024;
+		if (of_property_read_u32_index(np, "epibufsizes", i, &bufsize))
+			bufsize = 1024;
 		ret = gr_ep_init(dev, i, 1, bufsize);
 		if (ret)
 			return ret;
···
 	return 0;
 }
 
-static int gr_remove(struct platform_device *ofdev)
+static int gr_remove(struct platform_device *pdev)
 {
-	struct gr_udc *dev = dev_get_drvdata(&ofdev->dev);
+	struct gr_udc *dev = platform_get_drvdata(pdev);
 
 	if (dev->added)
 		usb_del_gadget_udc(&dev->gadget); /* Shuts everything down */
···
 	gr_dfs_delete(dev);
 	if (dev->desc_pool)
 		dma_pool_destroy(dev->desc_pool);
-	dev_set_drvdata(&ofdev->dev, NULL);
+	platform_set_drvdata(pdev, NULL);
 
 	gr_free_request(&dev->epi[0].ep, &dev->ep0reqi->req);
 	gr_free_request(&dev->epo[0].ep, &dev->ep0reqo->req);
···
 					 IRQF_SHARED, driver_name, dev);
 }
 
-static int gr_probe(struct platform_device *ofdev)
+static int gr_probe(struct platform_device *pdev)
 {
 	struct gr_udc *dev;
 	struct resource *res;
···
 	int retval;
 	u32 status;
 
-	dev = devm_kzalloc(&ofdev->dev, sizeof(*dev), GFP_KERNEL);
+	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;
-	dev->dev = &ofdev->dev;
+	dev->dev = &pdev->dev;
 
-	res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	regs = devm_ioremap_resource(dev->dev, res);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
 
-	dev->irq = irq_of_parse_and_map(dev->dev->of_node, 0);
-	if (!dev->irq) {
+	dev->irq = platform_get_irq(pdev, 0);
+	if (dev->irq <= 0) {
 		dev_err(dev->dev, "No irq found\n");
 		return -ENODEV;
 	}
 
 	/* Some core configurations has separate irqs for IN and OUT events */
-	dev->irqi = irq_of_parse_and_map(dev->dev->of_node, 1);
-	if (dev->irqi) {
-		dev->irqo = irq_of_parse_and_map(dev->dev->of_node, 2);
-		if (!dev->irqo) {
+	dev->irqi = platform_get_irq(pdev, 1);
+	if (dev->irqi > 0) {
+		dev->irqo = platform_get_irq(pdev, 2);
+		if (dev->irqo <= 0) {
 			dev_err(dev->dev, "Found irqi but not irqo\n");
 			return -ENODEV;
 		}
+	} else {
+		dev->irqi = 0;
 	}
 
 	dev->gadget.name = driver_name;
···
 	spin_lock_init(&dev->lock);
 	dev->regs = regs;
 
-	dev_set_drvdata(&ofdev->dev, dev);
+	platform_set_drvdata(pdev, dev);
 
 	/* Determine number of endpoints and data interface mode */
 	status = gr_read32(&dev->regs->status);
···
 	spin_unlock(&dev->lock);
 
 	if (retval)
-		gr_remove(ofdev);
+		gr_remove(pdev);
 
 	return retval;
 }

drivers/usb/gadget/inode.c

···
 		 */
 		if (value == 0) {
 			INFO (dev, "configuration #%d\n", dev->current_config);
+			usb_gadget_set_state(gadget, USB_STATE_CONFIGURED);
 			if (dev->usermode_setup) {
 				dev->setup_can_stall = 0;
 				goto delegate;

drivers/usb/gadget/m66592-udc.c

···
 	m66592 = kzalloc(sizeof(struct m66592), GFP_KERNEL);
 	if (m66592 == NULL) {
 		ret = -ENOMEM;
-		pr_err("kzalloc error\n");
 		goto clean_up;
 	}
 

drivers/usb/gadget/mv_u3d_core.c

···
 	u3d = req->ep->u3d;
 
 	trb = kzalloc(sizeof(*trb), GFP_ATOMIC);
-	if (!trb) {
-		dev_err(u3d->dev, "%s, trb alloc fail\n", __func__);
+	if (!trb)
 		return NULL;
-	}
 
 	/*
 	 * Be careful that no _GFP_HIGHMEM is set,
···
 			trb_num++;
 
 		trb = kcalloc(trb_num, sizeof(*trb), GFP_ATOMIC);
-		if (!trb) {
-			dev_err(u3d->dev,
-					"%s, trb alloc fail\n", __func__);
+		if (!trb)
 			return -ENOMEM;
-		}
 
 		trb_hw = kcalloc(trb_num, sizeof(*trb_hw), GFP_ATOMIC);
 		if (!trb_hw) {
 			kfree(trb);
-			dev_err(u3d->dev,
-					"%s, trb_hw alloc fail\n", __func__);
 			return -ENOMEM;
 		}
 
···
 
 	u3d = kzalloc(sizeof(*u3d), GFP_KERNEL);
 	if (!u3d) {
-		dev_err(&dev->dev, "failed to allocate memory for u3d\n");
 		retval = -ENOMEM;
 		goto err_alloc_private;
 	}
···
 	size = u3d->max_eps * sizeof(struct mv_u3d_ep) * 2;
 	u3d->eps = kzalloc(size, GFP_KERNEL);
 	if (!u3d->eps) {
-		dev_err(&dev->dev, "allocate ep memory failed\n");
 		retval = -ENOMEM;
 		goto err_alloc_eps;
 	}
···
 	/* initialize ep0 status request structure */
 	u3d->status_req = kzalloc(sizeof(struct mv_u3d_req) + 8, GFP_KERNEL);
 	if (!u3d->status_req) {
-		dev_err(&dev->dev, "allocate status_req memory failed\n");
 		retval = -ENOMEM;
 		goto err_alloc_status_req;
 	}

drivers/usb/gadget/net2280.c

···
 	device_remove_file (&dev->pdev->dev, &dev_attr_function);
 	device_remove_file (&dev->pdev->dev, &dev_attr_queues);
 
-	DEBUG (dev, "unregistered driver '%s'\n", driver->driver.name);
+	DEBUG(dev, "unregistered driver '%s'\n",
+			driver ? driver->driver.name : "");
+
 	return 0;
 }
 

drivers/usb/gadget/r8a66597-udc.c

···
 	r8a66597 = kzalloc(sizeof(struct r8a66597), GFP_KERNEL);
 	if (r8a66597 == NULL) {
 		ret = -ENOMEM;
-		dev_err(&pdev->dev, "kzalloc error\n");
 		goto clean_up;
 	}
 

drivers/usb/gadget/rndis.c

···
 	return rndis_indicate_status_msg(configNr,
 					  RNDIS_STATUS_MEDIA_CONNECT);
 }
-EXPORT_SYMBOL(rndis_signal_connect);
+EXPORT_SYMBOL_GPL(rndis_signal_connect);
 
 int rndis_signal_disconnect(int configNr)
 {
···
 	return rndis_indicate_status_msg(configNr,
 					  RNDIS_STATUS_MEDIA_DISCONNECT);
 }
-EXPORT_SYMBOL(rndis_signal_disconnect);
+EXPORT_SYMBOL_GPL(rndis_signal_disconnect);
 
 void rndis_uninit(int configNr)
 {
···
 	while ((buf = rndis_get_next_response(configNr, &length)))
 		rndis_free_response(configNr, buf);
 }
-EXPORT_SYMBOL(rndis_uninit);
+EXPORT_SYMBOL_GPL(rndis_uninit);
 
 void rndis_set_host_mac(int configNr, const u8 *addr)
 {
 	rndis_per_dev_params[configNr].host_mac = addr;
 }
-EXPORT_SYMBOL(rndis_set_host_mac);
+EXPORT_SYMBOL_GPL(rndis_set_host_mac);
 
 /*
  * Message Parser
···
 
 	return -ENOTSUPP;
 }
-EXPORT_SYMBOL(rndis_msg_parser);
+EXPORT_SYMBOL_GPL(rndis_msg_parser);
 
 int rndis_register(void (*resp_avail)(void *v), void *v)
 {
···
 
 	return -ENODEV;
 }
-EXPORT_SYMBOL(rndis_register);
+EXPORT_SYMBOL_GPL(rndis_register);
 
 void rndis_deregister(int configNr)
 {
···
 	if (configNr >= RNDIS_MAX_CONFIGS) return;
 	rndis_per_dev_params[configNr].used = 0;
 }
-EXPORT_SYMBOL(rndis_deregister);
+EXPORT_SYMBOL_GPL(rndis_deregister);
 
 int rndis_set_param_dev(u8 configNr, struct net_device *dev, u16 *cdc_filter)
 {
···
 
 	return 0;
 }
-EXPORT_SYMBOL(rndis_set_param_dev);
+EXPORT_SYMBOL_GPL(rndis_set_param_dev);
 
 int rndis_set_param_vendor(u8 configNr, u32 vendorID, const char *vendorDescr)
 {
···
 
 	return 0;
 }
-EXPORT_SYMBOL(rndis_set_param_vendor);
+EXPORT_SYMBOL_GPL(rndis_set_param_vendor);
 
 int rndis_set_param_medium(u8 configNr, u32 medium, u32 speed)
 {
···
 
 	return 0;
 }
-EXPORT_SYMBOL(rndis_set_param_medium);
+EXPORT_SYMBOL_GPL(rndis_set_param_medium);
 
 void rndis_add_hdr(struct sk_buff *skb)
 {
···
 	header->DataOffset = cpu_to_le32(36);
 	header->DataLength = cpu_to_le32(skb->len - sizeof(*header));
 }
-EXPORT_SYMBOL(rndis_add_hdr);
+EXPORT_SYMBOL_GPL(rndis_add_hdr);
 
 void rndis_free_response(int configNr, u8 *buf)
 {
···
 		}
 	}
 }
-EXPORT_SYMBOL(rndis_free_response);
+EXPORT_SYMBOL_GPL(rndis_free_response);
 
 u8 *rndis_get_next_response(int configNr, u32 *length)
 {
···
 
 	return NULL;
 }
-EXPORT_SYMBOL(rndis_get_next_response);
+EXPORT_SYMBOL_GPL(rndis_get_next_response);
 
 static rndis_resp_t *rndis_add_response(int configNr, u32 length)
 {
···
 	skb_queue_tail(list, skb);
 	return 0;
 }
-EXPORT_SYMBOL(rndis_rm_hdr);
+EXPORT_SYMBOL_GPL(rndis_rm_hdr);
 
 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
 

drivers/usb/gadget/s3c2410_udc.c

···
 			sizeof(printk_buf)-len, fmt, args);
 	va_end(args);
 
-	return pr_debug("%s", printk_buf);
+	pr_debug("%s", printk_buf);
+	return len;
 }
 #else
 static int dprintk(int level, const char *fmt, ...)

drivers/usb/gadget/storage_common.c

···
 	.bInterfaceProtocol =	USB_PR_BULK,	/* Adjusted during fsg_bind() */
 	.iInterface =		FSG_STRING_INTERFACE,
 };
-EXPORT_SYMBOL(fsg_intf_desc);
+EXPORT_SYMBOL_GPL(fsg_intf_desc);
 
 /*
  * Three full-speed endpoint descriptors: bulk-in, bulk-out, and
···
 	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
 	/* wMaxPacketSize set by autoconfiguration */
 };
-EXPORT_SYMBOL(fsg_fs_bulk_in_desc);
+EXPORT_SYMBOL_GPL(fsg_fs_bulk_in_desc);
 
 struct usb_endpoint_descriptor fsg_fs_bulk_out_desc = {
 	.bLength =		USB_DT_ENDPOINT_SIZE,
···
 	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
 	/* wMaxPacketSize set by autoconfiguration */
 };
-EXPORT_SYMBOL(fsg_fs_bulk_out_desc);
+EXPORT_SYMBOL_GPL(fsg_fs_bulk_out_desc);
 
 struct usb_descriptor_header *fsg_fs_function[] = {
 	(struct usb_descriptor_header *) &fsg_intf_desc,
···
 	(struct usb_descriptor_header *) &fsg_fs_bulk_out_desc,
 	NULL,
 };
-EXPORT_SYMBOL(fsg_fs_function);
+EXPORT_SYMBOL_GPL(fsg_fs_function);
 
 
 /*
···
 	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
 	.wMaxPacketSize =	cpu_to_le16(512),
 };
-EXPORT_SYMBOL(fsg_hs_bulk_in_desc);
+EXPORT_SYMBOL_GPL(fsg_hs_bulk_in_desc);
 
 struct usb_endpoint_descriptor fsg_hs_bulk_out_desc = {
 	.bLength =		USB_DT_ENDPOINT_SIZE,
···
 	.wMaxPacketSize =	cpu_to_le16(512),
 	.bInterval =		1,	/* NAK every 1 uframe */
 };
-EXPORT_SYMBOL(fsg_hs_bulk_out_desc);
+EXPORT_SYMBOL_GPL(fsg_hs_bulk_out_desc);
 
 
 struct usb_descriptor_header *fsg_hs_function[] = {
···
 	(struct usb_descriptor_header *) &fsg_hs_bulk_out_desc,
 	NULL,
 };
-EXPORT_SYMBOL(fsg_hs_function);
+EXPORT_SYMBOL_GPL(fsg_hs_function);
 
 struct usb_endpoint_descriptor fsg_ss_bulk_in_desc = {
 	.bLength =		USB_DT_ENDPOINT_SIZE,
···
 	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
 	.wMaxPacketSize =	cpu_to_le16(1024),
 };
-EXPORT_SYMBOL(fsg_ss_bulk_in_desc);
+EXPORT_SYMBOL_GPL(fsg_ss_bulk_in_desc);
 
 struct usb_ss_ep_comp_descriptor fsg_ss_bulk_in_comp_desc = {
 	.bLength =		sizeof(fsg_ss_bulk_in_comp_desc),
···
 
 	/*.bMaxBurst =		DYNAMIC, */
 };
-EXPORT_SYMBOL(fsg_ss_bulk_in_comp_desc);
+EXPORT_SYMBOL_GPL(fsg_ss_bulk_in_comp_desc);
 
 struct usb_endpoint_descriptor fsg_ss_bulk_out_desc = {
 	.bLength =		USB_DT_ENDPOINT_SIZE,
···
 	.bmAttributes =		USB_ENDPOINT_XFER_BULK,
 	.wMaxPacketSize =	cpu_to_le16(1024),
 };
-EXPORT_SYMBOL(fsg_ss_bulk_out_desc);
+EXPORT_SYMBOL_GPL(fsg_ss_bulk_out_desc);
 
 struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc = {
 	.bLength =		sizeof(fsg_ss_bulk_in_comp_desc),
···
 
 	/*.bMaxBurst =		DYNAMIC, */
 };
-EXPORT_SYMBOL(fsg_ss_bulk_out_comp_desc);
+EXPORT_SYMBOL_GPL(fsg_ss_bulk_out_comp_desc);
 
 struct usb_descriptor_header *fsg_ss_function[] = {
 	(struct usb_descriptor_header *) &fsg_intf_desc,
···
 	(struct usb_descriptor_header *) &fsg_ss_bulk_out_comp_desc,
 	NULL,
 };
-EXPORT_SYMBOL(fsg_ss_function);
+EXPORT_SYMBOL_GPL(fsg_ss_function);
 
 
  /*-------------------------------------------------------------------------*/
···
 		curlun->filp = NULL;
 	}
 }
-EXPORT_SYMBOL(fsg_lun_close);
+EXPORT_SYMBOL_GPL(fsg_lun_close);
 
 int fsg_lun_open(struct fsg_lun *curlun, const char *filename)
 {
···
 	fput(filp);
 	return rc;
 }
-EXPORT_SYMBOL(fsg_lun_open);
+EXPORT_SYMBOL_GPL(fsg_lun_open);
 
 
 /*-------------------------------------------------------------------------*/
···
 		return 0;
 	return vfs_fsync(filp, 1);
 }
-EXPORT_SYMBOL(fsg_lun_fsync_sub);
+EXPORT_SYMBOL_GPL(fsg_lun_fsync_sub);
 
 void store_cdrom_address(u8 *dest, int msf, u32 addr)
 {
···
 		put_unaligned_be32(addr, dest);
 	}
 }
-EXPORT_SYMBOL(store_cdrom_address);
+EXPORT_SYMBOL_GPL(store_cdrom_address);
 
 /*-------------------------------------------------------------------------*/
 
···
 				  ? curlun->ro
 				  : curlun->initially_ro);
 }
-EXPORT_SYMBOL(fsg_show_ro);
+EXPORT_SYMBOL_GPL(fsg_show_ro);
 
 ssize_t fsg_show_nofua(struct fsg_lun *curlun, char *buf)
 {
 	return sprintf(buf, "%u\n", curlun->nofua);
 }
-EXPORT_SYMBOL(fsg_show_nofua);
+EXPORT_SYMBOL_GPL(fsg_show_nofua);
 
 ssize_t fsg_show_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 		      char *buf)
···
 	up_read(filesem);
 	return rc;
 }
-EXPORT_SYMBOL(fsg_show_file);
+EXPORT_SYMBOL_GPL(fsg_show_file);
 
 ssize_t fsg_show_cdrom(struct fsg_lun *curlun, char *buf)
 {
 	return sprintf(buf, "%u\n", curlun->cdrom);
 }
-EXPORT_SYMBOL(fsg_show_cdrom);
+EXPORT_SYMBOL_GPL(fsg_show_cdrom);
 
 ssize_t fsg_show_removable(struct fsg_lun *curlun, char *buf)
 {
 	return sprintf(buf, "%u\n", curlun->removable);
 }
-EXPORT_SYMBOL(fsg_show_removable);
+EXPORT_SYMBOL_GPL(fsg_show_removable);
 
 /*
  * The caller must hold fsg->filesem for reading when calling this function.
···
 
 	return rc;
 }
-EXPORT_SYMBOL(fsg_store_ro);
+EXPORT_SYMBOL_GPL(fsg_store_ro);
 
 ssize_t fsg_store_nofua(struct fsg_lun *curlun, const char *buf, size_t count)
 {
···
 
 	return count;
 }
-EXPORT_SYMBOL(fsg_store_nofua);
+EXPORT_SYMBOL_GPL(fsg_store_nofua);
 
 ssize_t fsg_store_file(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 		       const char *buf, size_t count)
···
 	up_write(filesem);
 	return (rc < 0 ? rc : count);
 }
-EXPORT_SYMBOL(fsg_store_file);
+EXPORT_SYMBOL_GPL(fsg_store_file);
 
 ssize_t fsg_store_cdrom(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 			const char *buf, size_t count)
···
 
 	return ret;
 }
-EXPORT_SYMBOL(fsg_store_cdrom);
+EXPORT_SYMBOL_GPL(fsg_store_cdrom);
 
 ssize_t fsg_store_removable(struct fsg_lun *curlun, const char *buf,
 			    size_t count)
···
 
 	return count;
 }
-EXPORT_SYMBOL(fsg_store_removable);
+EXPORT_SYMBOL_GPL(fsg_store_removable);
 
 MODULE_LICENSE("GPL");

drivers/usb/gadget/tcm_usb_gadget.c

···
 	struct usbg_nacl *nacl;
 
 	nacl = kzalloc(sizeof(struct usbg_nacl), GFP_KERNEL);
-	if (!nacl) {
-		printk(KERN_ERR "Unable to allocate struct usbg_nacl\n");
+	if (!nacl)
 		return NULL;
-	}
 
 	return &nacl->se_node_acl;
 }
···
 	}
 
 	tpg = kzalloc(sizeof(struct usbg_tpg), GFP_KERNEL);
-	if (!tpg) {
-		printk(KERN_ERR "Unable to allocate struct usbg_tpg");
+	if (!tpg)
 		return ERR_PTR(-ENOMEM);
-	}
 	mutex_init(&tpg->tpg_mutex);
 	atomic_set(&tpg->tpg_port_count, 0);
 	tpg->workqueue = alloc_workqueue("tcm_usb_gadget", 0, 1);
···
 		return ERR_PTR(-EINVAL);
 
 	tport = kzalloc(sizeof(struct usbg_tport), GFP_KERNEL);
-	if (!(tport)) {
-		printk(KERN_ERR "Unable to allocate struct usbg_tport");
+	if (!(tport))
 		return ERR_PTR(-ENOMEM);
-	}
 	tport->tport_wwpn = wwpn;
 	snprintf(tport->tport_name, sizeof(tport->tport_name), "%s", wnn_name);
 	return &tport->tport_wwn;
···
 
 	ret = -ENOMEM;
 	tv_nexus = kzalloc(sizeof(*tv_nexus), GFP_KERNEL);
-	if (!tv_nexus) {
-		pr_err("Unable to allocate struct tcm_vhost_nexus\n");
+	if (!tv_nexus)
 		goto err_unlock;
-	}
 	tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
 	if (IS_ERR(tv_nexus->tvn_se_sess))
 		goto err_free;

drivers/usb/gadget/u_ether.c

···
 
 	return dev;
 }
-EXPORT_SYMBOL(gether_setup_name);
+EXPORT_SYMBOL_GPL(gether_setup_name);
 
 struct net_device *gether_setup_name_default(const char *netname)
 {
···
 
 	return net;
 }
-EXPORT_SYMBOL(gether_setup_name_default);
+EXPORT_SYMBOL_GPL(gether_setup_name_default);
 
 int gether_register_netdev(struct net_device *net)
 {
···
 
 	return status;
 }
-EXPORT_SYMBOL(gether_register_netdev);
+EXPORT_SYMBOL_GPL(gether_register_netdev);
 
 void gether_set_gadget(struct net_device *net, struct usb_gadget *g)
 {
···
 	dev->gadget = g;
 	SET_NETDEV_DEV(net, &g->dev);
 }
-EXPORT_SYMBOL(gether_set_gadget);
+EXPORT_SYMBOL_GPL(gether_set_gadget);
 
 int gether_set_dev_addr(struct net_device *net, const char *dev_addr)
 {
···
 	memcpy(dev->dev_mac, new_addr, ETH_ALEN);
 	return 0;
 }
-EXPORT_SYMBOL(gether_set_dev_addr);
+EXPORT_SYMBOL_GPL(gether_set_dev_addr);
 
 int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len)
 {
···
 	dev = netdev_priv(net);
 	return get_ether_addr_str(dev->dev_mac, dev_addr, len);
 }
-EXPORT_SYMBOL(gether_get_dev_addr);
+EXPORT_SYMBOL_GPL(gether_get_dev_addr);
 
 int gether_set_host_addr(struct net_device *net, const char *host_addr)
 {
···
 	memcpy(dev->host_mac, new_addr, ETH_ALEN);
 	return 0;
 }
-EXPORT_SYMBOL(gether_set_host_addr);
+EXPORT_SYMBOL_GPL(gether_set_host_addr);
 
 int gether_get_host_addr(struct net_device *net, char *host_addr, int len)
 {
···
 	dev = netdev_priv(net);
 	return get_ether_addr_str(dev->host_mac, host_addr, len);
 }
-EXPORT_SYMBOL(gether_get_host_addr);
+EXPORT_SYMBOL_GPL(gether_get_host_addr);
 
 int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len)
 {
···
 
 	return strlen(host_addr);
 }
-EXPORT_SYMBOL(gether_get_host_addr_cdc);
+EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc);
 
 void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN])
 {
···
 	dev = netdev_priv(net);
 	memcpy(host_mac, dev->host_mac, ETH_ALEN);
 }
-EXPORT_SYMBOL(gether_get_host_addr_u8);
+EXPORT_SYMBOL_GPL(gether_get_host_addr_u8);
 
 void gether_set_qmult(struct net_device *net, unsigned qmult)
 {
···
 	dev = netdev_priv(net);
 	dev->qmult = qmult;
 }
-EXPORT_SYMBOL(gether_set_qmult);
+EXPORT_SYMBOL_GPL(gether_set_qmult);
 
 unsigned gether_get_qmult(struct net_device *net)
 {
···
 	dev = netdev_priv(net);
 	return dev->qmult;
 }
-EXPORT_SYMBOL(gether_get_qmult);
+EXPORT_SYMBOL_GPL(gether_get_qmult);
 
 int gether_get_ifname(struct net_device *net, char *name, int len)
 {
···
 	rtnl_unlock();
 	return strlen(name);
 }
-EXPORT_SYMBOL(gether_get_ifname);
+EXPORT_SYMBOL_GPL(gether_get_ifname);
 
 /**
  * gether_cleanup - remove Ethernet-over-USB device
···
 	flush_work(&dev->work);
 	free_netdev(dev->net);
 }
-EXPORT_SYMBOL(gether_cleanup);
+EXPORT_SYMBOL_GPL(gether_cleanup);
 
 /**
  * gether_connect - notify network layer that USB link is active
···
 		return ERR_PTR(result);
 	return dev->net;
 }
-EXPORT_SYMBOL(gether_connect);
+EXPORT_SYMBOL_GPL(gether_connect);
 
 /**
  * gether_disconnect - notify network layer that USB link is inactive
···
 	dev->port_usb = NULL;
 	spin_unlock(&dev->lock);
 }
-EXPORT_SYMBOL(gether_disconnect);
+EXPORT_SYMBOL_GPL(gether_disconnect);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("David Brownell");

drivers/usb/gadget/u_f.c

···
 	}
 	return req;
 }
-EXPORT_SYMBOL(alloc_ep_req);
+EXPORT_SYMBOL_GPL(alloc_ep_req);

drivers/usb/gadget/u_f.h

···
 #ifndef __U_F_H__
 #define __U_F_H__
 
+/* Variable Length Array Macros **********************************************/
+#define vla_group(groupname) size_t groupname##__next = 0
+#define vla_group_size(groupname) groupname##__next
+
+#define vla_item(groupname, type, name, n) \
+	size_t groupname##_##name##__offset = ({			       \
+		size_t align_mask = __alignof__(type) - 1;		       \
+		size_t offset = (groupname##__next + align_mask) & ~align_mask;\
+		size_t size = (n) * sizeof(type);			       \
+		groupname##__next = offset + size;			       \
+		offset;							       \
+	})
+
+#define vla_item_with_sz(groupname, type, name, n) \
+	size_t groupname##_##name##__sz = (n) * sizeof(type);		       \
+	size_t groupname##_##name##__offset = ({			       \
+		size_t align_mask = __alignof__(type) - 1;		       \
+		size_t offset = (groupname##__next + align_mask) & ~align_mask;\
+		size_t size = groupname##_##name##__sz;			       \
+		groupname##__next = offset + size;			       \
+		offset;							       \
+	})
+
+#define vla_ptr(ptr, groupname, name) \
+	((void *) ((char *)ptr + groupname##_##name##__offset))
+
 struct usb_ep;
 struct usb_request;
 

drivers/usb/gadget/u_os_desc.h

···
+/*
+ * u_os_desc.h
+ *
+ * Utility definitions for "OS Descriptors" support
+ *
+ * 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_OS_DESC_H__
+#define __U_OS_DESC_H__
+
+#include <asm/unaligned.h>
+#include <linux/nls.h>
+
+#define USB_EXT_PROP_DW_SIZE			0
+#define USB_EXT_PROP_DW_PROPERTY_DATA_TYPE	4
+#define USB_EXT_PROP_W_PROPERTY_NAME_LENGTH	8
+#define USB_EXT_PROP_B_PROPERTY_NAME		10
+#define USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH	10
+#define USB_EXT_PROP_B_PROPERTY_DATA		14
+
+#define USB_EXT_PROP_RESERVED			0
+#define USB_EXT_PROP_UNICODE			1
+#define USB_EXT_PROP_UNICODE_ENV		2
+#define USB_EXT_PROP_BINARY			3
+#define USB_EXT_PROP_LE32			4
+#define USB_EXT_PROP_BE32			5
+#define USB_EXT_PROP_UNICODE_LINK		6
+#define USB_EXT_PROP_UNICODE_MULTI		7
+
+static inline void usb_ext_prop_put_size(u8 *buf, int dw_size)
+{
+	put_unaligned_le32(dw_size, &buf[USB_EXT_PROP_DW_SIZE]);
+}
+
+static inline void usb_ext_prop_put_type(u8 *buf, int type)
+{
+	put_unaligned_le32(type, &buf[USB_EXT_PROP_DW_PROPERTY_DATA_TYPE]);
+}
+
+static inline int usb_ext_prop_put_name(u8 *buf, const char *name, int pnl)
+{
+	int result;
+
+	put_unaligned_le16(pnl, &buf[USB_EXT_PROP_W_PROPERTY_NAME_LENGTH]);
+	result = utf8s_to_utf16s(name, strlen(name), UTF16_LITTLE_ENDIAN,
+		(wchar_t *) &buf[USB_EXT_PROP_B_PROPERTY_NAME], pnl - 2);
+	if (result < 0)
+		return result;
+
+	put_unaligned_le16(0, &buf[USB_EXT_PROP_B_PROPERTY_NAME + pnl]);
+
+	return pnl;
+}
+
+static inline void usb_ext_prop_put_binary(u8 *buf, int pnl, const u8 *data,
+					   int data_len)
+{
+	put_unaligned_le32(data_len,
+			   &buf[USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + pnl]);
+	memcpy(&buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl], data, data_len);
+}
+
+static inline int usb_ext_prop_put_unicode(u8 *buf, int pnl, const char *string,
+					   int data_len)
+{
+	int result;
+	put_unaligned_le32(data_len,
+			&buf[USB_EXT_PROP_DW_PROPERTY_DATA_LENGTH + pnl]);
+
+	result = utf8s_to_utf16s(string, data_len >> 1, UTF16_LITTLE_ENDIAN,
+			(wchar_t *) &buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl],
+			data_len - 2);
+	if (result < 0)
+		return result;
+
+	put_unaligned_le16(0,
+			&buf[USB_EXT_PROP_B_PROPERTY_DATA + pnl + data_len]);
+
+	return data_len;
+}
+
+#endif /* __U_OS_DESC_H__ */

drivers/usb/gadget/u_rndis.h

···
 	bool				bound;
 	bool				borrowed_net;
 
+	struct usb_os_desc		rndis_os_desc;
+	char				rndis_ext_compat_id[16];
+
 	/*
 	 * Read/write access to configfs attributes is handled by configfs.
 	 *

drivers/usb/gadget/udc-core.c

···
 	list_for_each_entry(udc, &udc_list, list)
 		if (udc->driver == driver) {
 			usb_gadget_remove_driver(udc);
+			usb_gadget_set_state(udc->gadget,
+					USB_STATE_NOTATTACHED);
 			ret = 0;
 			break;
 		}

drivers/usb/gadget/uvc_queue.c

···
 #include <linux/vmalloc.h>
 #include <linux/wait.h>
 
+#include <media/v4l2-common.h>
 #include <media/videobuf2-vmalloc.h>
 
 #include "uvc.h"
···
 	queue->queue.buf_struct_size = sizeof(struct uvc_buffer);
 	queue->queue.ops = &uvc_queue_qops;
 	queue->queue.mem_ops = &vb2_vmalloc_memops;
+	queue->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC
+				     | V4L2_BUF_FLAG_TSTAMP_SRC_EOF;
 	ret = vb2_queue_init(&queue->queue);
 	if (ret)
 		return ret;
···
 	else
 		nextbuf = NULL;
 
-	/*
-	 * FIXME: with videobuf2, the sequence number or timestamp fields
-	 * are valid only for video capture devices and the UVC gadget usually
-	 * is a video output device. Keeping these until the specs are clear on
-	 * this aspect.
-	 */
+	buf->buf.v4l2_buf.field = V4L2_FIELD_NONE;
 	buf->buf.v4l2_buf.sequence = queue->sequence++;
-	do_gettimeofday(&buf->buf.v4l2_buf.timestamp);
+	v4l2_get_timestamp(&buf->buf.v4l2_buf.timestamp);
 
 	vb2_set_plane_payload(&buf->buf, 0, buf->bytesused);
 	vb2_buffer_done(&buf->buf, VB2_BUF_STATE_DONE);

drivers/usb/host/Kconfig

···
 	tristate "Support for Qualcomm QSD/MSM on-chip EHCI USB controller"
 	depends on ARCH_MSM
 	select USB_EHCI_ROOT_HUB_TT
-	select USB_MSM_OTG
 	---help---
 	  Enables support for the USB Host controller present on the
 	  Qualcomm chipsets. Root Hub has inbuilt TT.

drivers/usb/musb/Kconfig

···
 
 config USB_MUSB_OMAP2PLUS
 	tristate "OMAP2430 and onwards"
-	depends on ARCH_OMAP2PLUS
+	depends on ARCH_OMAP2PLUS && USB
 	select GENERIC_PHY
 
 config USB_MUSB_AM35X
···
 config USB_TI_CPPI41_DMA
 	bool 'TI CPPI 4.1 (AM335x)'
 	depends on ARCH_OMAP
+	select TI_CPPI41
 
 config USB_TUSB_OMAP_DMA
 	bool 'TUSB 6010'
-	depends on USB_MUSB_TUSB6010
+	depends on USB_MUSB_TUSB6010 = USB_MUSB_HDRC # both built-in or both modules
 	depends on ARCH_OMAP
 	help
 	  Enable DMA transfers on TUSB 6010 when OMAP DMA is available.

drivers/usb/musb/am35x.c

···
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 #include <linux/platform_data/usb-omap.h>
 
 #include "musb_core.h"
···
 struct am35x_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
+	struct platform_device	*phy;
 	struct clk		*phy_clk;
 	struct clk		*clk;
 };
···
 	if (!rev)
 		return -ENODEV;
 
-	usb_nop_xceiv_register();
 	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (IS_ERR_OR_NULL(musb->xceiv))
 		return -EPROBE_DEFER;
···
 		data->set_phy_power(0);
 
 	usb_put_phy(musb->xceiv);
-	usb_nop_xceiv_unregister();
 
 	return 0;
 }
···
 
 	pdata->platform_ops		= &am35x_ops;
 
+	glue->phy = usb_phy_generic_register();
+	if (IS_ERR(glue->phy))
+		goto err7;
 	platform_set_drvdata(pdev, glue);
 
 	pinfo = am35x_dev_info;
···
 	if (IS_ERR(musb)) {
 		ret = PTR_ERR(musb);
 		dev_err(&pdev->dev, "failed to register musb device: %d\n", ret);
-		goto err7;
+		goto err8;
 	}
 
 	return 0;
+
+err8:
+	usb_phy_generic_unregister(glue->phy);
 
 err7:
 	clk_disable(clk);
···
 	struct am35x_glue	*glue = platform_get_drvdata(pdev);
 
 	platform_device_unregister(glue->musb);
+	usb_phy_generic_unregister(glue->phy);
 	clk_disable(glue->clk);
 	clk_disable(glue->phy_clk);
 	clk_put(glue->clk);

drivers/usb/musb/blackfin.c

···
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/prefetch.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 
 #include <asm/cacheflush.h>
 
···
 struct bfin_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
+	struct platform_device	*phy;
 };
 #define glue_to_musb(g)		platform_get_drvdata(g->musb)
 
···
 	}
 	gpio_direction_output(musb->config->gpio_vrsel, 0);
 
-	usb_nop_xceiv_register();
 	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (IS_ERR_OR_NULL(musb->xceiv)) {
 		gpio_free(musb->config->gpio_vrsel);
···
 static int bfin_musb_exit(struct musb *musb)
 {
 	gpio_free(musb->config->gpio_vrsel);
-
 	usb_put_phy(musb->xceiv);
-	usb_nop_xceiv_unregister();
+
 	return 0;
 }
 
···
 
 	pdata->platform_ops		= &bfin_ops;
 
+	glue->phy = usb_phy_generic_register();
+	if (IS_ERR(glue->phy))
+		goto err2;
 	platform_set_drvdata(pdev, glue);
 
 	memset(musb_resources, 0x00, sizeof(*musb_resources) *
···
 	return 0;
 
 err3:
+	usb_phy_generic_unregister(glue->phy);
+
+err2:
 	platform_device_put(musb);
 
 err1:
···
 	struct bfin_glue		*glue = platform_get_drvdata(pdev);
 
 	platform_device_unregister(glue->musb);
+	usb_phy_generic_unregister(glue->phy);
 	kfree(glue);
 
 	return 0;

drivers/usb/musb/da8xx.c

···
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 
 #include <mach/da8xx.h>
 #include <linux/platform_data/usb-davinci.h>
···
 struct da8xx_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
+	struct platform_device	*phy;
 	struct clk		*clk;
 };
 
···
 	if (!rev)
 		goto fail;
 
-	usb_nop_xceiv_register();
 	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (IS_ERR_OR_NULL(musb->xceiv)) {
 		ret = -EPROBE_DEFER;
···
 	phy_off();
 
 	usb_put_phy(musb->xceiv);
-	usb_nop_xceiv_unregister();
 
 	return 0;
 }
···
 
 	pdata->platform_ops		= &da8xx_ops;
 
+	glue->phy = usb_phy_generic_register();
+	if (IS_ERR(glue->phy)) {
+		ret = PTR_ERR(glue->phy);
+		goto err5;
+	}
 	platform_set_drvdata(pdev, glue);
 
 	memset(musb_resources, 0x00, sizeof(*musb_resources) *
···
 	if (IS_ERR(musb)) {
 		ret = PTR_ERR(musb);
 		dev_err(&pdev->dev, "failed to register musb device: %d\n", ret);
-		goto err5;
+		goto err6;
 	}
 
 	return 0;
+
+err6:
+	usb_phy_generic_unregister(glue->phy);
 
 err5:
 	clk_disable(clk);
···
 	struct da8xx_glue		*glue = platform_get_drvdata(pdev);
 
 	platform_device_unregister(glue->musb);
+	usb_phy_generic_unregister(glue->phy);
 	clk_disable(glue->clk);
 	clk_put(glue->clk);
 	kfree(glue);

drivers/usb/musb/davinci.c

···
 #include <linux/gpio.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 
 #include <mach/cputype.h>
 #include <mach/hardware.h>
···
 	u32		revision;
 	int 		ret = -ENODEV;
 
-	usb_nop_xceiv_register();
 	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (IS_ERR_OR_NULL(musb->xceiv)) {
 		ret = -EPROBE_DEFER;
···
 fail:
 	usb_put_phy(musb->xceiv);
 unregister:
-	usb_nop_xceiv_unregister();
+	usb_phy_generic_unregister();
 	return ret;
 }
 
···
 	phy_off();
 
 	usb_put_phy(musb->xceiv);
-	usb_nop_xceiv_unregister();
 
 	return 0;
 }
···
 
 	pdata->platform_ops		= &davinci_ops;
 
+	usb_phy_generic_register();
 	platform_set_drvdata(pdev, glue);
 
 	memset(musb_resources, 0x00, sizeof(*musb_resources) *
···
 	struct davinci_glue		*glue = platform_get_drvdata(pdev);
 
 	platform_device_unregister(glue->musb);
+	usb_phy_generic_unregister();
 	clk_disable(glue->clk);
 	clk_put(glue->clk);
 	kfree(glue);

drivers/usb/musb/musb_core.c

···
 		}
 	}
 
+	/* handle babble condition */
+	if (int_usb & MUSB_INTR_BABBLE)
+		schedule_work(&musb->recover_work);
+
 #if 0
 /* REVISIT ... this would be for multiplexing periodic endpoints, or
  * supporting transfer phasing to prevent exceeding ISO bandwidth
···
 	}
 }
 
+/* Recover from babble interrupt conditions */
+static void musb_recover_work(struct work_struct *data)
+{
+	struct musb *musb = container_of(data, struct musb, recover_work);
+	int status;
+
+	musb_platform_reset(musb);
+
+	usb_phy_vbus_off(musb->xceiv);
+	udelay(100);
+
+	usb_phy_vbus_on(musb->xceiv);
+	udelay(100);
+
+	/*
+	 * When a babble condition occurs, the musb controller removes the
+	 * session bit and the endpoint config is lost.
+	 */
+	if (musb->dyn_fifo)
+		status = ep_config_from_table(musb);
+	else
+		status = ep_config_from_hw(musb);
+
+	/* start the session again */
+	if (status == 0)
+		musb_start(musb);
+}
+
 /* --------------------------------------------------------------------------
  * Init support
  */
···
 
 	/* Init IRQ workqueue before request_irq */
 	INIT_WORK(&musb->irq_work, musb_irq_work);
+	INIT_WORK(&musb->recover_work, musb_recover_work);
 	INIT_DELAYED_WORK(&musb->deassert_reset_work, musb_deassert_reset);
 	INIT_DELAYED_WORK(&musb->finish_resume_work, musb_host_finish_resume);
 
···
 
 fail3:
 	cancel_work_sync(&musb->irq_work);
+	cancel_work_sync(&musb->recover_work);
 	cancel_delayed_work_sync(&musb->finish_resume_work);
 	cancel_delayed_work_sync(&musb->deassert_reset_work);
 	if (musb->dma_controller)
···
 		dma_controller_destroy(musb->dma_controller);
 
 	cancel_work_sync(&musb->irq_work);
+	cancel_work_sync(&musb->recover_work);
 	cancel_delayed_work_sync(&musb->finish_resume_work);
 	cancel_delayed_work_sync(&musb->deassert_reset_work);
 	musb_free(musb);

drivers/usb/musb/musb_core.h

···
 
 	int	(*set_mode)(struct musb *musb, u8 mode);
 	void	(*try_idle)(struct musb *musb, unsigned long timeout);
+	void	(*reset)(struct musb *musb);
 
 	int	(*vbus_status)(struct musb *musb);
 	void	(*set_vbus)(struct musb *musb, int on);
···
 
 	irqreturn_t		(*isr)(int, void *);
 	struct work_struct	irq_work;
+	struct work_struct	recover_work;
 	struct delayed_work	deassert_reset_work;
 	struct delayed_work	finish_resume_work;
 	u16			hwvers;
···
 	dma_addr_t		async;
 	dma_addr_t		sync;
 	void __iomem		*sync_va;
+	u8			tusb_revision;
 #endif
 
 	/* passed down from chip/board specific irq handlers */
···
 {
 	if (musb->ops->try_idle)
 		musb->ops->try_idle(musb, timeout);
+}
+
+static inline void musb_platform_reset(struct musb *musb)
+{
+	if (musb->ops->reset)
+		musb->ops->reset(musb);
 }
 
 static inline int musb_platform_get_vbus_status(struct musb *musb)

drivers/usb/musb/musb_dsps.c

···
 #include <linux/dma-mapping.h>
 #include <linux/pm_runtime.h>
 #include <linux/module.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 #include <linux/platform_data/usb-omap.h>
 #include <linux/sizes.h>
 
···
 	 * value but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
 	 * Also, DRVVBUS pulses for SRP (but not at 5V) ...
 	 */
-	if (is_host_active(musb) && usbintr & MUSB_INTR_BABBLE)
+	if (is_host_active(musb) && usbintr & MUSB_INTR_BABBLE) {
 		pr_info("CAUTION: musb: Babble Interrupt Occurred\n");
+
+		/*
+		 * When a babble condition occurs, the musb controller removes
+		 * the session and is no longer in host mode. Hence, all
+		 * devices connected to its root hub get disconnected.
+		 *
+		 * Hand this error down to the musb core isr, so it can
+		 * recover.
+		 */
+		musb->int_usb = MUSB_INTR_BABBLE | MUSB_INTR_DISCONNECT;
+		musb->int_tx = musb->int_rx = 0;
+	}
 
 	if (usbintr & ((1 << wrp->drvvbus) << wrp->usb_shift)) {
 		int drvvbus = dsps_readl(reg_base, wrp->status);
···
 	return 0;
 }
 
+static void dsps_musb_reset(struct musb *musb)
+{
+	struct device *dev = musb->controller;
+	struct dsps_glue *glue = dev_get_drvdata(dev->parent);
+	const struct dsps_musb_wrapper *wrp = glue->wrp;
+
+	dsps_writel(musb->ctrl_base, wrp->control, (1 << wrp->reset));
+	udelay(100);
+}
+
 static struct musb_platform_ops dsps_ops = {
 	.init		= dsps_musb_init,
 	.exit		= dsps_musb_exit,
···
 
 	.try_idle	= dsps_musb_try_idle,
 	.set_mode	= dsps_musb_set_mode,
+	.reset		= dsps_musb_reset,
 };
 
 static u64 musb_dmamask = DMA_BIT_MASK(32);
···
 };
 MODULE_DEVICE_TABLE(of, musb_dsps_of_match);
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
 static int dsps_suspend(struct device *dev)
 {
 	struct dsps_glue *glue = dev_get_drvdata(dev);

drivers/usb/musb/tusb6010.c

···
 #include <linux/io.h>
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 
 #include "musb_core.h"
 
 struct tusb6010_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
+	struct platform_device	*phy;
 };
 
 static void tusb_musb_set_vbus(struct musb *musb, int is_on);
···
  * Checks the revision. We need to use the DMA register as 3.0 does not
  * have correct versions for TUSB_PRCM_REV or TUSB_INT_CTRL_REV.
  */
-u8 tusb_get_revision(struct musb *musb)
+static u8 tusb_get_revision(struct musb *musb)
 {
 	void __iomem	*tbase = musb->ctrl_base;
 	u32		die_id;
···
 
 	return rev;
 }
-EXPORT_SYMBOL_GPL(tusb_get_revision);
 
-static int tusb_print_revision(struct musb *musb)
+static void tusb_print_revision(struct musb *musb)
 {
 	void __iomem	*tbase = musb->ctrl_base;
 	u8		rev;
 
-	rev = tusb_get_revision(musb);
+	rev = musb->tusb_revision;
 
 	pr_info("tusb: %s%i.%i %s%i.%i %s%i.%i %s%i.%i %s%i %s%i.%i\n",
 		"prcm",
···
 		TUSB_DIDR1_HI_CHIP_REV(musb_readl(tbase, TUSB_DIDR1_HI)),
 		"rev",
 		TUSB_REV_MAJOR(rev), TUSB_REV_MINOR(rev));
-
-	return tusb_get_revision(musb);
 }
 
 #define WBUS_QUIRK_MASK	(TUSB_PHY_OTG_CTRL_TESTM2 | TUSB_PHY_OTG_CTRL_TESTM1 \
···
 	u32		reg;
 
 	if ((wakeup_enables & TUSB_PRCM_WBUS)
-			&& (tusb_get_revision(musb) == TUSB_REV_30))
+			&& (musb->tusb_revision == TUSB_REV_30))
 		tusb_wbus_quirk(musb, 1);
 
 	tusb_set_clock_source(musb, 0);
···
 		u32	reg;
 		u32	i;
 
-		if (tusb_get_revision(musb) == TUSB_REV_30)
+		if (musb->tusb_revision == TUSB_REV_30)
 			tusb_wbus_quirk(musb, 0);
 
 		/* there are issues re-locking the PLL on wakeup ... */
···
 		goto err;
 	}
 
-	ret = tusb_print_revision(musb);
-	if (ret < 2) {
+	musb->tusb_revision = tusb_get_revision(musb);
+	tusb_print_revision(musb);
+	if (musb->tusb_revision < 2) {
 		printk(KERN_ERR "tusb: Unsupported TUSB6010 revision %i\n",
-				ret);
+				musb->tusb_revision);
 		goto err;
 	}
 
···
 	void __iomem		*sync = NULL;
 	int			ret;
 
-	usb_nop_xceiv_register();
 	musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
 	if (IS_ERR_OR_NULL(musb->xceiv))
 		return -EPROBE_DEFER;
···
 			iounmap(sync);
 
 		usb_put_phy(musb->xceiv);
-		usb_nop_xceiv_unregister();
 	}
 	return ret;
 }
···
 	iounmap(musb->sync_va);
 
 	usb_put_phy(musb->xceiv);
-	usb_nop_xceiv_unregister();
 	return 0;
 }
 
···
 
 	pdata->platform_ops		= &tusb_ops;
 
+	usb_phy_generic_register();
 	platform_set_drvdata(pdev, glue);
 
 	memset(musb_resources, 0x00, sizeof(*musb_resources) *
···
 	struct tusb6010_glue		*glue = platform_get_drvdata(pdev);
 
 	platform_device_unregister(glue->musb);
+	usb_phy_generic_unregister(glue->phy);
 	kfree(glue);
 
 	return 0;

drivers/usb/musb/tusb6010.h

···
 #ifndef __TUSB6010_H__
 #define __TUSB6010_H__
 
-extern u8 tusb_get_revision(struct musb *musb);
-
-#ifdef CONFIG_USB_TUSB6010
-#define musb_in_tusb()			1
-#else
-#define musb_in_tusb()			0
-#endif
-
 #ifdef CONFIG_USB_TUSB_OMAP_DMA
 #define tusb_dma_omap()			1
 #else

drivers/usb/musb/tusb6010_omap.c

···
 	tusb_dma->controller.channel_program = tusb_omap_dma_program;
 	tusb_dma->controller.channel_abort = tusb_omap_dma_abort;
 
-	if (tusb_get_revision(musb) >= TUSB_REV_30)
+	if (musb->tusb_revision >= TUSB_REV_30)
 		tusb_dma->multichannel = 1;
 
 	for (i = 0; i < MAX_DMAREQ; i++) {

drivers/usb/phy/Kconfig

···
 	  module will be called phy-isp1301.
 
 config USB_MSM_OTG
-	tristate "OTG support for Qualcomm on-chip USB controller"
-	depends on (USB || USB_GADGET) && ARCH_MSM
+	tristate "Qualcomm on-chip USB OTG controller support"
+	depends on (USB || USB_GADGET) && (ARCH_MSM || ARCH_QCOM || COMPILE_TEST)
+	depends on RESET_CONTROLLER
 	select USB_PHY
 	help
-	  Enable this to support the USB OTG transceiver on MSM chips. It
+	  Enable this to support the USB OTG transceiver on Qualcomm chips. It
 	  handles PHY initialization, clock management, and workarounds
 	  required after resetting the hardware and power management.
 	  This driver is required even for peripheral only or host only

drivers/usb/phy/phy-am335x.c

···
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/usb/otg.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/regulator/consumer.h>
···
 #include "phy-generic.h"
 
 struct am335x_phy {
-	struct usb_phy_gen_xceiv usb_phy_gen;
+	struct usb_phy_generic usb_phy_gen;
 	struct phy_control *phy_ctrl;
 	int id;
 };

drivers/usb/phy/phy-generic.c

···
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/usb/otg.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 #include <linux/slab.h>
 #include <linux/clk.h>
 #include <linux/regulator/consumer.h>
···
 
 #include "phy-generic.h"
 
-static struct platform_device *pd;
-
-void usb_nop_xceiv_register(void)
+struct platform_device *usb_phy_generic_register(void)
 {
-	if (pd)
-		return;
-	pd = platform_device_register_simple("usb_phy_gen_xceiv", -1, NULL, 0);
-	if (IS_ERR(pd)) {
-		pr_err("Unable to register generic usb transceiver\n");
-		pd = NULL;
-		return;
-	}
+	return platform_device_register_simple("usb_phy_generic",
+			PLATFORM_DEVID_AUTO, NULL, 0);
 }
-EXPORT_SYMBOL(usb_nop_xceiv_register);
+EXPORT_SYMBOL_GPL(usb_phy_generic_register);
 
-void usb_nop_xceiv_unregister(void)
+void usb_phy_generic_unregister(struct platform_device *pdev)
 {
-	platform_device_unregister(pd);
-	pd = NULL;
+	platform_device_unregister(pdev);
 }
-EXPORT_SYMBOL(usb_nop_xceiv_unregister);
+EXPORT_SYMBOL_GPL(usb_phy_generic_unregister);
 
 static int nop_set_suspend(struct usb_phy *x, int suspend)
 {
 	return 0;
 }
 
-static void nop_reset_set(struct usb_phy_gen_xceiv *nop, int asserted)
+static void nop_reset_set(struct usb_phy_generic *nop, int asserted)
 {
 	int value;
 
···
 
 int usb_gen_phy_init(struct usb_phy *phy)
 {
-	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);
+	struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
 
 	if (!IS_ERR(nop->vcc)) {
 		if (regulator_enable(nop->vcc))
···
 
 void usb_gen_phy_shutdown(struct usb_phy *phy)
 {
-	struct usb_phy_gen_xceiv *nop = dev_get_drvdata(phy->dev);
+	struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
 
 	/* Assert RESET */
 	nop_reset_set(nop, 1);
···
 	return 0;
 }
 
-int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_gen_xceiv *nop,
-		struct usb_phy_gen_xceiv_platform_data *pdata)
+int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
+		struct usb_phy_generic_platform_data *pdata)
 {
 	enum usb_phy_type type = USB_PHY_TYPE_USB2;
 	int err;
···
 }
 EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);
 
-static int usb_phy_gen_xceiv_probe(struct platform_device *pdev)
+static int usb_phy_generic_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct usb_phy_gen_xceiv	*nop;
+	struct usb_phy_generic	*nop;
 	int err;
 
 	nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
···
 	return 0;
 }
 
-static int usb_phy_gen_xceiv_remove(struct platform_device *pdev)
+static int usb_phy_generic_remove(struct platform_device *pdev)
 {
-	struct usb_phy_gen_xceiv *nop = platform_get_drvdata(pdev);
+	struct usb_phy_generic *nop = platform_get_drvdata(pdev);
 
 	usb_remove_phy(&nop->phy);
 
···
 
 MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
 
-static struct platform_driver usb_phy_gen_xceiv_driver = {
-	.probe		= usb_phy_gen_xceiv_probe,
-	.remove		= usb_phy_gen_xceiv_remove,
+static struct platform_driver usb_phy_generic_driver = {
+	.probe		= usb_phy_generic_probe,
+	.remove		= usb_phy_generic_remove,
 	.driver		= {
-		.name	= "usb_phy_gen_xceiv",
+		.name	= "usb_phy_generic",
 		.owner	= THIS_MODULE,
 		.of_match_table = nop_xceiv_dt_ids,
 	},
 };
 
-static int __init usb_phy_gen_xceiv_init(void)
+static int __init usb_phy_generic_init(void)
 {
-	return platform_driver_register(&usb_phy_gen_xceiv_driver);
+	return platform_driver_register(&usb_phy_generic_driver);
 }
-subsys_initcall(usb_phy_gen_xceiv_init);
+subsys_initcall(usb_phy_generic_init);
 
-static void __exit usb_phy_gen_xceiv_exit(void)
+static void __exit usb_phy_generic_exit(void)
 {
-	platform_driver_unregister(&usb_phy_gen_xceiv_driver);
+	platform_driver_unregister(&usb_phy_generic_driver);
 }
-module_exit(usb_phy_gen_xceiv_exit);
+module_exit(usb_phy_generic_exit);
 
-MODULE_ALIAS("platform:usb_phy_gen_xceiv");
+MODULE_ALIAS("platform:usb_phy_generic");
 MODULE_AUTHOR("Texas Instruments Inc");
 MODULE_DESCRIPTION("NOP USB Transceiver driver");
 MODULE_LICENSE("GPL");

drivers/usb/phy/phy-generic.h

···
 #ifndef _PHY_GENERIC_H_
 #define _PHY_GENERIC_H_
 
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 
-struct usb_phy_gen_xceiv {
+struct usb_phy_generic {
 	struct usb_phy phy;
 	struct device *dev;
 	struct clk *clk;
···
 int usb_gen_phy_init(struct usb_phy *phy);
 void usb_gen_phy_shutdown(struct usb_phy *phy);
 
-int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_gen_xceiv *nop,
-		struct usb_phy_gen_xceiv_platform_data *pdata);
+int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
+		struct usb_phy_generic_platform_data *pdata);
 
 #endif

drivers/usb/phy/phy-keystone.c

···
 
 #include <linux/module.h>
 #include <linux/platform_device.h>
-#include <linux/usb/usb_phy_gen_xceiv.h>
+#include <linux/usb/usb_phy_generic.h>
 #include <linux/io.h>
 #include <linux/of.h>
 
···
 #define PHY_REF_SSP_EN			BIT(29)
 
 struct keystone_usbphy {
-	struct usb_phy_gen_xceiv	usb_phy_gen;
+	struct usb_phy_generic	usb_phy_gen;
 	void __iomem			*phy_ctrl;
 };
 

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

···
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/reset.h>
 
 #include <linux/usb.h>
 #include <linux/usb/otg.h>
+#include <linux/usb/of.h>
 #include <linux/usb/ulpi.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/hcd.h>
···
 #define DRIVER_NAME	"msm_otg"
 
 #define ULPI_IO_TIMEOUT_USEC	(10 * 1000)
+#define LINK_RESET_TIMEOUT_USEC	(250 * 1000)
 
 #define USB_PHY_3P3_VOL_MIN	3050000 /* uV */
 #define USB_PHY_3P3_VOL_MAX	3300000 /* uV */
···
 
 #define USB_PHY_VDD_DIG_VOL_MIN	1000000 /* uV */
 #define USB_PHY_VDD_DIG_VOL_MAX	1320000 /* uV */
+#define USB_PHY_SUSP_DIG_VOL	500000  /* uV */
 
-static struct regulator *hsusb_3p3;
-static struct regulator *hsusb_1p8;
-static struct regulator *hsusb_vddcx;
+enum vdd_levels {
+	VDD_LEVEL_NONE = 0,
+	VDD_LEVEL_MIN,
+	VDD_LEVEL_MAX,
+};
 
 static int msm_hsusb_init_vddcx(struct msm_otg *motg, int init)
 {
 	int ret = 0;
 
 	if (init) {
-		hsusb_vddcx = regulator_get(motg->phy.dev, "HSUSB_VDDCX");
-		if (IS_ERR(hsusb_vddcx)) {
-			dev_err(motg->phy.dev, "unable to get hsusb vddcx\n");
-			return PTR_ERR(hsusb_vddcx);
-		}
-
-		ret = regulator_set_voltage(hsusb_vddcx,
-				USB_PHY_VDD_DIG_VOL_MIN,
-				USB_PHY_VDD_DIG_VOL_MAX);
+		ret = regulator_set_voltage(motg->vddcx,
+				motg->vdd_levels[VDD_LEVEL_MIN],
+				motg->vdd_levels[VDD_LEVEL_MAX]);
 		if (ret) {
-			dev_err(motg->phy.dev, "unable to set the voltage "
-					"for hsusb vddcx\n");
-			regulator_put(hsusb_vddcx);
+			dev_err(motg->phy.dev, "Cannot set vddcx voltage\n");
 			return ret;
 		}
 
-		ret = regulator_enable(hsusb_vddcx);
-		if (ret) {
-			dev_err(motg->phy.dev, "unable to enable hsusb vddcx\n");
-			regulator_put(hsusb_vddcx);
-		}
-	} else {
-		ret = regulator_set_voltage(hsusb_vddcx, 0,
-			USB_PHY_VDD_DIG_VOL_MAX);
+		ret = regulator_enable(motg->vddcx);
 		if (ret)
-			dev_err(motg->phy.dev, "unable to set the voltage "
-					"for hsusb vddcx\n");
-		ret = regulator_disable(hsusb_vddcx);
+			dev_err(motg->phy.dev, "unable to enable hsusb vddcx\n");
+	} else {
+		ret = regulator_set_voltage(motg->vddcx, 0,
+				motg->vdd_levels[VDD_LEVEL_MAX]);
+		if (ret)
+			dev_err(motg->phy.dev, "Cannot set vddcx voltage\n");
+		ret = regulator_disable(motg->vddcx);
 		if (ret)
 			dev_err(motg->phy.dev, "unable to disable hsusb vddcx\n");
-
-		regulator_put(hsusb_vddcx);
 	}
 
 	return ret;
···
 	int rc = 0;
 
 	if (init) {
-		hsusb_3p3 = regulator_get(motg->phy.dev, "HSUSB_3p3");
-		if (IS_ERR(hsusb_3p3)) {
-			dev_err(motg->phy.dev, "unable to get hsusb 3p3\n");
-			return PTR_ERR(hsusb_3p3);
-		}
-
-		rc = regulator_set_voltage(hsusb_3p3, USB_PHY_3P3_VOL_MIN,
+		rc = regulator_set_voltage(motg->v3p3, USB_PHY_3P3_VOL_MIN,
 				USB_PHY_3P3_VOL_MAX);
 		if (rc) {
-			dev_err(motg->phy.dev, "unable to set voltage level "
-					"for hsusb 3p3\n");
-			goto put_3p3;
+			dev_err(motg->phy.dev, "Cannot set v3p3 voltage\n");
+			goto exit;
 		}
-		rc = regulator_enable(hsusb_3p3);
+		rc = regulator_enable(motg->v3p3);
 		if (rc) {
 			dev_err(motg->phy.dev, "unable to enable the hsusb 3p3\n");
-			goto put_3p3;
+			goto exit;
 		}
-		hsusb_1p8 = regulator_get(motg->phy.dev, "HSUSB_1p8");
-		if (IS_ERR(hsusb_1p8)) {
-			dev_err(motg->phy.dev, "unable to get hsusb 1p8\n");
-			rc = PTR_ERR(hsusb_1p8);
-			goto disable_3p3;
-		}
-		rc = regulator_set_voltage(hsusb_1p8, USB_PHY_1P8_VOL_MIN,
+		rc = regulator_set_voltage(motg->v1p8, USB_PHY_1P8_VOL_MIN,
 				USB_PHY_1P8_VOL_MAX);
 		if (rc) {
-			dev_err(motg->phy.dev, "unable to set voltage level "
-					"for hsusb 1p8\n");
-			goto put_1p8;
+			dev_err(motg->phy.dev, "Cannot set v1p8 voltage\n");
+			goto disable_3p3;
 		}
-		rc = regulator_enable(hsusb_1p8);
+		rc = regulator_enable(motg->v1p8);
 		if (rc) {
 			dev_err(motg->phy.dev, "unable to enable the hsusb 1p8\n");
-			goto put_1p8;
+			goto disable_3p3;
 		}
 
 		return 0;
 	}
 
-	regulator_disable(hsusb_1p8);
-put_1p8:
-	regulator_put(hsusb_1p8);
+	regulator_disable(motg->v1p8);
 disable_3p3:
-	regulator_disable(hsusb_3p3);
-put_3p3:
-	regulator_put(hsusb_3p3);
+	regulator_disable(motg->v3p3);
+exit:
 	return rc;
 }
 
-static int msm_hsusb_ldo_set_mode(int on)
+static int msm_hsusb_ldo_set_mode(struct msm_otg *motg, int on)
 {
 	int ret = 0;
 
-	if (!hsusb_1p8 || IS_ERR(hsusb_1p8)) {
-		pr_err("%s: HSUSB_1p8 is not initialized\n", __func__);
-		return -ENODEV;
-	}
-
-	if (!hsusb_3p3 || IS_ERR(hsusb_3p3)) {
-		pr_err("%s: HSUSB_3p3 is not initialized\n", __func__);
-		return -ENODEV;
-	}
-
 	if (on) {
-		ret = regulator_set_optimum_mode(hsusb_1p8,
+		ret = regulator_set_optimum_mode(motg->v1p8,
 				USB_PHY_1P8_HPM_LOAD);
 		if (ret < 0) {
-			pr_err("%s: Unable to set HPM of the regulator "
-				"HSUSB_1p8\n", __func__);
+			pr_err("Could not set HPM for v1p8\n");
 			return ret;
 		}
-		ret = regulator_set_optimum_mode(hsusb_3p3,
+		ret = regulator_set_optimum_mode(motg->v3p3,
 				USB_PHY_3P3_HPM_LOAD);
 		if (ret < 0) {
-			pr_err("%s: Unable to set HPM of the regulator "
-				"HSUSB_3p3\n", __func__);
-			regulator_set_optimum_mode(hsusb_1p8,
+			pr_err("Could not set HPM for v3p3\n");
+			regulator_set_optimum_mode(motg->v1p8,
 				USB_PHY_1P8_LPM_LOAD);
 			return ret;
 		}
 	} else {
-		ret = regulator_set_optimum_mode(hsusb_1p8,
+		ret = regulator_set_optimum_mode(motg->v1p8,
 				USB_PHY_1P8_LPM_LOAD);
 		if (ret < 0)
-			pr_err("%s: Unable to set LPM of the regulator "
-				"HSUSB_1p8\n", __func__);
-		ret = regulator_set_optimum_mode(hsusb_3p3,
+			pr_err("Could not set LPM for v1p8\n");
+		ret = regulator_set_optimum_mode(motg->v3p3,
 				USB_PHY_3P3_LPM_LOAD);
 		if (ret < 0)
-			pr_err("%s: Unable to set LPM of the regulator "
-				"HSUSB_3p3\n", __func__);
+			pr_err("Could not set LPM for v3p3\n");
 	}
 
 	pr_debug("reg (%s)\n", on ? "HPM" : "LPM");
···
 static void ulpi_init(struct msm_otg *motg)
 {
 	struct msm_otg_platform_data *pdata = motg->pdata;
-	int *seq = pdata->phy_init_seq;
+	int *seq = pdata->phy_init_seq, idx;
+	u32 addr = ULPI_EXT_VENDOR_SPECIFIC;
 
-	if (!seq)
-		return;
+	for (idx = 0; idx < pdata->phy_init_sz; idx++) {
+		if (seq[idx] == -1)
+			continue;
 
-	while (seq[0] >= 0) {
 		dev_vdbg(motg->phy.dev, "ulpi: write 0x%02x to 0x%02x\n",
-				seq[0], seq[1]);
-		ulpi_write(&motg->phy, seq[0], seq[1]);
-		seq += 2;
+				seq[idx], addr + idx);
+		ulpi_write(&motg->phy, seq[idx], addr + idx);
 	}
+}
+
+static int msm_phy_notify_disconnect(struct usb_phy *phy,
+				   enum usb_device_speed speed)
+{
+	int val;
+
+	/*
+	 * Put the transceiver in non-driving mode. Otherwise host
+	 * may not detect soft-disconnection.
+	 */
+	val = ulpi_read(phy, ULPI_FUNC_CTRL);
+	val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
+	val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
+	ulpi_write(phy, val, ULPI_FUNC_CTRL);
+
+	return 0;
 }
 
 static int msm_otg_link_clk_reset(struct msm_otg *motg, bool assert)
 {
-	int ret = 0;
+	int ret;
 
-	if (!motg->pdata->link_clk_reset)
-		return ret;
+	if (motg->pdata->link_clk_reset)
+		ret = motg->pdata->link_clk_reset(motg->clk, assert);
+	else if (assert)
+		ret = reset_control_assert(motg->link_rst);
+	else
+		ret = reset_control_deassert(motg->link_rst);
 
-	ret = motg->pdata->link_clk_reset(motg->clk, assert);
 	if (ret)
 		dev_err(motg->phy.dev, "usb link clk reset %s failed\n",
 			assert ? "assert" : "deassert");
···
 
 static int msm_otg_phy_clk_reset(struct msm_otg *motg)
 {
-	int ret = 0;
+	int ret;
 
-	if (!motg->pdata->phy_clk_reset)
-		return ret;
+	if (motg->pdata->phy_clk_reset)
+		ret = motg->pdata->phy_clk_reset(motg->phy_reset_clk);
+	else
+		ret = reset_control_reset(motg->phy_rst);
 
-	ret = motg->pdata->phy_clk_reset(motg->phy_reset_clk);
 	if (ret)
 		dev_err(motg->phy.dev, "usb phy clk reset failed\n");
 
 	return ret;
 }
 
-static int msm_otg_phy_reset(struct msm_otg *motg)
+static int msm_link_reset(struct msm_otg *motg)
 {
 	u32 val;
 	int ret;
-	int retries;
 
 	ret = msm_otg_link_clk_reset(motg, 1);
 	if (ret)
 		return ret;
-	ret = msm_otg_phy_clk_reset(motg);
-	if (ret)
-		return ret;
+
+	/* wait for 1ms delay as suggested in HPG. */
+	usleep_range(1000, 1200);
+
 	ret = msm_otg_link_clk_reset(motg, 0);
 	if (ret)
 		return ret;
 
+	if (motg->phy_number)
+		writel(readl(USB_PHY_CTRL2) | BIT(16), USB_PHY_CTRL2);
+
+	/* put transceiver in serial mode as part of reset */
 	val = readl(USB_PORTSC) & ~PORTSC_PTS_MASK;
-	writel(val | PORTSC_PTS_ULPI, USB_PORTSC);
+	writel(val | PORTSC_PTS_SERIAL, USB_PORTSC);
 
-	for (retries = 3; retries > 0; retries--) {
-		ret = ulpi_write(&motg->phy, ULPI_FUNC_CTRL_SUSPENDM,
-				ULPI_CLR(ULPI_FUNC_CTRL));
-		if (!ret)
-			break;
-		ret = msm_otg_phy_clk_reset(motg);
-		if (ret)
-			return ret;
-	}
-	if (!retries)
-		return -ETIMEDOUT;
-
-	/* This reset calibrates the phy, if the above write succeeded */
-	ret = msm_otg_phy_clk_reset(motg);
-	if (ret)
-		return ret;
-
-	for (retries = 3; retries > 0; retries--) {
-		ret = ulpi_read(&motg->phy, ULPI_DEBUG);
-		if (ret != -ETIMEDOUT)
-			break;
-		ret = msm_otg_phy_clk_reset(motg);
-		if (ret)
-			return ret;
-	}
-	if (!retries)
-		return -ETIMEDOUT;
-
-	dev_info(motg->phy.dev, "phy_reset: success\n");
 	return 0;
 }
 
-#define LINK_RESET_TIMEOUT_USEC		(250 * 1000)
 static int msm_otg_reset(struct usb_phy *phy)
 {
 	struct msm_otg *motg = container_of(phy, struct msm_otg, phy);
-	struct msm_otg_platform_data *pdata = motg->pdata;
 	int cnt = 0;
-	int ret;
-	u32 val = 0;
-	u32 ulpi_val = 0;
-
-	ret = msm_otg_phy_reset(motg);
-	if (ret) {
-		dev_err(phy->dev, "phy_reset failed\n");
-		return ret;
-	}
-
-	ulpi_init(motg);
 
 	writel(USBCMD_RESET, USB_USBCMD);
 	while (cnt < LINK_RESET_TIMEOUT_USEC) {
···
 	if (cnt >= LINK_RESET_TIMEOUT_USEC)
 		return -ETIMEDOUT;
 
-	/* select ULPI phy */
-	writel(0x80000000, USB_PORTSC);
+	/* select ULPI phy and clear other status/control bits in PORTSC */
+	writel(PORTSC_PTS_ULPI, USB_PORTSC);
+
+	writel(0x0, USB_AHBBURST);
+	writel(0x08, USB_AHBMODE);
+
+	if (motg->phy_number)
+		writel(readl(USB_PHY_CTRL2) | BIT(16), USB_PHY_CTRL2);
+	return 0;
+}
+
+static void msm_phy_reset(struct msm_otg *motg)
+{
+	void __iomem *addr;
+
+	if (motg->pdata->phy_type != SNPS_28NM_INTEGRATED_PHY) {
+		msm_otg_phy_clk_reset(motg);
+		return;
+	}
+
+	addr = USB_PHY_CTRL;
+	if (motg->phy_number)
+		addr = USB_PHY_CTRL2;
+
+	/* Assert USB PHY_POR */
+	writel(readl(addr) | PHY_POR_ASSERT, addr);
+
+	/*
+	 * wait for minimum 10 microseconds as suggested in HPG.
+	 * Use a slightly larger value since the exact value didn't
+	 * work 100% of the time.
+	 */
+	udelay(12);
+
+	/* Deassert USB PHY_POR */
+	writel(readl(addr) & ~PHY_POR_ASSERT, addr);
+}
+
+static int msm_usb_reset(struct usb_phy *phy)
+{
+	struct msm_otg *motg = container_of(phy, struct msm_otg, phy);
+	int ret;
+
+	if (!IS_ERR(motg->core_clk))
+		clk_prepare_enable(motg->core_clk);
+
+	ret = msm_link_reset(motg);
+	if (ret) {
+		dev_err(phy->dev, "phy_reset failed\n");
+		return ret;
+	}
+
+	ret = msm_otg_reset(&motg->phy);
+	if (ret) {
+		dev_err(phy->dev, "link reset failed\n");
+		return ret;
+	}
 
 	msleep(100);
 
-	writel(0x0, USB_AHBBURST);
-	writel(0x00, USB_AHBMODE);
+	/* Reset USB PHY after performing USB Link RESET */
+	msm_phy_reset(motg);
+
+	if (!IS_ERR(motg->core_clk))
+		clk_disable_unprepare(motg->core_clk);
+
+	return 0;
+}
+
+static int msm_phy_init(struct usb_phy *phy)
+{
+	struct msm_otg *motg = container_of(phy, struct msm_otg, phy);
+	struct msm_otg_platform_data *pdata = motg->pdata;
+	u32 val, ulpi_val = 0;
+
+	/* Program USB PHY Override registers. */
+	ulpi_init(motg);
+
+	/*
+	 * It is recommended in HPG to reset USB PHY after programming
+	 * USB PHY Override registers.
+	 */
+	msm_phy_reset(motg);
 
 	if (pdata->otg_control == OTG_PHY_CONTROL) {
 		val = readl(USB_OTGSC);
-		if (pdata->mode == USB_OTG) {
+		if (pdata->mode == USB_DR_MODE_OTG) {
 			ulpi_val = ULPI_INT_IDGRD | ULPI_INT_SESS_VALID;
 			val |= OTGSC_IDIE | OTGSC_BSVIE;
-		} else if (pdata->mode == USB_PERIPHERAL) {
+		} else if (pdata->mode == USB_DR_MODE_PERIPHERAL) {
 			ulpi_val = ULPI_INT_SESS_VALID;
 			val |= OTGSC_BSVIE;
 		}
···
 		ulpi_write(phy, ulpi_val, ULPI_USB_INT_EN_RISE);
 		ulpi_write(phy, ulpi_val, ULPI_USB_INT_EN_FALL);
 	}
+
+	if (motg->phy_number)
+		writel(readl(USB_PHY_CTRL2) | BIT(16), USB_PHY_CTRL2);
 
 	return 0;
 }
···
 
 #ifdef CONFIG_PM
 
-#define USB_PHY_SUSP_DIG_VOL  500000
-static int msm_hsusb_config_vddcx(int high)
+static int msm_hsusb_config_vddcx(struct msm_otg *motg, int high)
 {
-	int max_vol = USB_PHY_VDD_DIG_VOL_MAX;
+	int max_vol = motg->vdd_levels[VDD_LEVEL_MAX];
 	int min_vol;
 	int ret;
 
 	if (high)
-		min_vol = USB_PHY_VDD_DIG_VOL_MIN;
+		min_vol = motg->vdd_levels[VDD_LEVEL_MIN];
 	else
-		min_vol = USB_PHY_SUSP_DIG_VOL;
+		min_vol = motg->vdd_levels[VDD_LEVEL_NONE];
 
-	ret = regulator_set_voltage(hsusb_vddcx, min_vol, max_vol);
+	ret = regulator_set_voltage(motg->vddcx, min_vol, max_vol);
 	if (ret) {
-		pr_err("%s: unable to set the voltage for regulator "
-			"HSUSB_VDDCX\n", __func__);
+		pr_err("Cannot set vddcx voltage\n");
 		return ret;
 	}
 
···
 	struct usb_phy *phy = &motg->phy;
 	struct usb_bus *bus = phy->otg->host;
 	struct msm_otg_platform_data *pdata = motg->pdata;
+	void __iomem *addr;
 	int cnt = 0;
 
 	if (atomic_read(&motg->in_lpm))
···
 	 */
 	writel(readl(USB_USBCMD) | ASYNC_INTR_CTRL | ULPI_STP_CTRL, USB_USBCMD);
 
+	addr = USB_PHY_CTRL;
+	if (motg->phy_number)
+		addr = USB_PHY_CTRL2;
+
 	if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
 			motg->pdata->otg_control == OTG_PMIC_CONTROL)
-		writel(readl(USB_PHY_CTRL) | PHY_RETEN, USB_PHY_CTRL);
+		writel(readl(addr) | PHY_RETEN, addr);
 
 	clk_disable_unprepare(motg->pclk);
 	clk_disable_unprepare(motg->clk);
-	if (motg->core_clk)
+	if (!IS_ERR(motg->core_clk))
 		clk_disable_unprepare(motg->core_clk);
-
-	if (!IS_ERR(motg->pclk_src))
-		clk_disable_unprepare(motg->pclk_src);
 
 	if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
 			motg->pdata->otg_control == OTG_PMIC_CONTROL) {
-		msm_hsusb_ldo_set_mode(0);
-		msm_hsusb_config_vddcx(0);
+		msm_hsusb_ldo_set_mode(motg, 0);
+		msm_hsusb_config_vddcx(motg, 0);
 	}
 
 	if (device_may_wakeup(phy->dev))
···
 {
 	struct usb_phy *phy = &motg->phy;
 	struct usb_bus *bus = phy->otg->host;
+	void __iomem *addr;
 	int cnt = 0;
 	unsigned temp;
 
 	if (!atomic_read(&motg->in_lpm))
 		return 0;
 
-	if (!IS_ERR(motg->pclk_src))
-		clk_prepare_enable(motg->pclk_src);
-
 	clk_prepare_enable(motg->pclk);
 	clk_prepare_enable(motg->clk);
-	if (motg->core_clk)
+	if (!IS_ERR(motg->core_clk))
 		clk_prepare_enable(motg->core_clk);
 
 	if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
 			motg->pdata->otg_control == OTG_PMIC_CONTROL) {
-		msm_hsusb_ldo_set_mode(1);
-		msm_hsusb_config_vddcx(1);
-		writel(readl(USB_PHY_CTRL) & ~PHY_RETEN, USB_PHY_CTRL);
+
+		addr = USB_PHY_CTRL;
+		if (motg->phy_number)
+			addr = USB_PHY_CTRL2;
+
+		msm_hsusb_ldo_set_mode(motg, 1);
+		msm_hsusb_config_vddcx(motg, 1);
+		writel(readl(addr) & ~PHY_RETEN, addr);
 	}
 
 	temp = readl(USB_USBCMD);
···
 		 * PHY. USB state can not be restored. Re-insertion
 		 * of USB cable is the only way to get USB working.
 		 */
-		dev_err(phy->dev, "Unable to resume USB."
-				"Re-plugin the cable\n");
+		dev_err(phy->dev, "Unable to resume USB. Re-plugin the cable\n");
 		msm_otg_reset(phy);
 	}
 
···
 	 * Fail host registration if this board can support
 	 * only peripheral configuration.
 	 */
-	if (motg->pdata->mode == USB_PERIPHERAL) {
+	if (motg->pdata->mode == USB_DR_MODE_PERIPHERAL) {
 		dev_info(otg->phy->dev, "Host mode is not supported\n");
 		return -ENODEV;
 	}
···
 	 * Kick the state machine work, if peripheral is not supported
 	 * or peripheral is already registered with us.
 	 */
-	if (motg->pdata->mode == USB_HOST || otg->gadget) {
+	if (motg->pdata->mode == USB_DR_MODE_HOST || otg->gadget) {
 		pm_runtime_get_sync(otg->phy->dev);
 		schedule_work(&motg->sm_work);
 	}
···
 	 * Fail peripheral registration if this board can support
 	 * only host configuration.
 	 */
-	if (motg->pdata->mode == USB_HOST) {
+	if (motg->pdata->mode == USB_DR_MODE_HOST) {
 		dev_info(otg->phy->dev, "Peripheral mode is not supported\n");
 		return -ENODEV;
 	}
···
 	 * Kick the state machine work, if host is not supported
 	 * or host is already registered with us.
 	 */
-	if (motg->pdata->mode == USB_PERIPHERAL || otg->host) {
+	if (motg->pdata->mode == USB_DR_MODE_PERIPHERAL || otg->host) {
 		pm_runtime_get_sync(otg->phy->dev);
 		schedule_work(&motg->sm_work);
 	}
···
 	u32 otgsc = readl(USB_OTGSC);
 
 	switch (pdata->mode) {
-	case USB_OTG:
+	case USB_DR_MODE_OTG:
 		if (pdata->otg_control == OTG_PHY_CONTROL) {
 			if (otgsc & OTGSC_ID)
 				set_bit(ID, &motg->inputs);
···
 			else
 				clear_bit(B_SESS_VLD, &motg->inputs);
 		} else if (pdata->otg_control == OTG_USER_CONTROL) {
-			if (pdata->default_mode == USB_HOST) {
-				clear_bit(ID, &motg->inputs);
-			} else if (pdata->default_mode == USB_PERIPHERAL) {
-				set_bit(ID, &motg->inputs);
-				set_bit(B_SESS_VLD, &motg->inputs);
-			} else {
 				set_bit(ID, &motg->inputs);
 				clear_bit(B_SESS_VLD, &motg->inputs);
-			}
 		}
 		break;
-	case USB_HOST:
+	case USB_DR_MODE_HOST:
 		clear_bit(ID, &motg->inputs);
 		break;
-	case USB_PERIPHERAL:
+	case USB_DR_MODE_PERIPHERAL:
 		set_bit(ID, &motg->inputs);
 		if (otgsc & OTGSC_BSV)
 			set_bit(B_SESS_VLD, &motg->inputs);
···
 
 	switch (otg->phy->state) {
 	case OTG_STATE_A_HOST:
-		seq_printf(s, "host\n");
+		seq_puts(s, "host\n");
 		break;
 	case OTG_STATE_B_PERIPHERAL:
-		seq_printf(s, "peripheral\n");
+		seq_puts(s, "peripheral\n");
 		break;
 	default:
-		seq_printf(s, "none\n");
+		seq_puts(s, "none\n");
 		break;
 	}
 
···
 	char buf[16];
 	struct usb_otg *otg = motg->phy.otg;
 	int status = count;
-	enum usb_mode_type req_mode;
+	enum usb_dr_mode req_mode;
 
 	memset(buf, 0x00, sizeof(buf));
 
···
 	}
 
 	if (!strncmp(buf, "host", 4)) {
-		req_mode = USB_HOST;
+		req_mode = USB_DR_MODE_HOST;
 	} else if (!strncmp(buf, "peripheral", 10)) {
-		req_mode = USB_PERIPHERAL;
+		req_mode = USB_DR_MODE_PERIPHERAL;
 	} else if (!strncmp(buf, "none", 4)) {
-		req_mode = USB_NONE;
+		req_mode = USB_DR_MODE_UNKNOWN;
 	} else {
 		status = -EINVAL;
 		goto out;
 	}
 
 	switch (req_mode) {
-	case USB_NONE:
+	case USB_DR_MODE_UNKNOWN:
 		switch (otg->phy->state) {
 		case OTG_STATE_A_HOST:
 		case OTG_STATE_B_PERIPHERAL:
···
 			goto out;
 		}
 		break;
-	case USB_PERIPHERAL:
+	case USB_DR_MODE_PERIPHERAL:
 		switch (otg->phy->state) {
 		case OTG_STATE_B_IDLE:
 		case OTG_STATE_A_HOST:
···
 			goto out;
 		}
 		break;
-	case USB_HOST:
+	case USB_DR_MODE_HOST:
 		switch (otg->phy->state) {
 		case OTG_STATE_B_IDLE:
 		case OTG_STATE_B_PERIPHERAL:
···
 	debugfs_remove(msm_otg_dbg_root);
 }
 
-static int __init msm_otg_probe(struct platform_device *pdev)
+static struct of_device_id msm_otg_dt_match[] = {
+	{
+		.compatible = "qcom,usb-otg-ci",
+		.data = (void *) CI_45NM_INTEGRATED_PHY
+	},
+	{
+		.compatible = "qcom,usb-otg-snps",
+		.data = (void *) SNPS_28NM_INTEGRATED_PHY
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, msm_otg_dt_match);
+
+static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 {
+	struct msm_otg_platform_data *pdata;
+	const struct of_device_id *id;
+	struct device_node *node = pdev->dev.of_node;
+	struct property *prop;
+	int len, ret, words;
+	u32 val, tmp[3];
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	motg->pdata = pdata;
+
+	id = of_match_device(msm_otg_dt_match, &pdev->dev);
+	pdata->phy_type = (enum msm_usb_phy_type) id->data;
+
+	motg->link_rst = devm_reset_control_get(&pdev->dev, "link");
+	if (IS_ERR(motg->link_rst))
+		return PTR_ERR(motg->link_rst);
+
+	motg->phy_rst = devm_reset_control_get(&pdev->dev, "phy");
+	if (IS_ERR(motg->phy_rst))
+		return PTR_ERR(motg->phy_rst);
+
+	pdata->mode = of_usb_get_dr_mode(node);
+	if (pdata->mode == USB_DR_MODE_UNKNOWN)
+		pdata->mode = USB_DR_MODE_OTG;
+
+	pdata->otg_control = OTG_PHY_CONTROL;
+	if (!of_property_read_u32(node, "qcom,otg-control", &val))
+		if (val == OTG_PMIC_CONTROL)
+			pdata->otg_control = val;
+
+	if (!of_property_read_u32(node, "qcom,phy-num", &val) && val < 2)
+		motg->phy_number = val;
+
+	motg->vdd_levels[VDD_LEVEL_NONE] = USB_PHY_SUSP_DIG_VOL;
+	motg->vdd_levels[VDD_LEVEL_MIN] = USB_PHY_VDD_DIG_VOL_MIN;
+	motg->vdd_levels[VDD_LEVEL_MAX] = USB_PHY_VDD_DIG_VOL_MAX;
+
+	if (of_get_property(node, "qcom,vdd-levels", &len) &&
+	    len == sizeof(tmp)) {
+		of_property_read_u32_array(node, "qcom,vdd-levels",
+					   tmp, len / sizeof(*tmp));
+		motg->vdd_levels[VDD_LEVEL_NONE] = tmp[VDD_LEVEL_NONE];
+		motg->vdd_levels[VDD_LEVEL_MIN] = tmp[VDD_LEVEL_MIN];
+		motg->vdd_levels[VDD_LEVEL_MAX] = tmp[VDD_LEVEL_MAX];
+	}
+
+	prop = of_find_property(node, "qcom,phy-init-sequence", &len);
+	if (!prop || !len)
+		return 0;
+
+	words = len / sizeof(u32);
+
+	if (words >= ULPI_EXT_VENDOR_SPECIFIC) {
+		dev_warn(&pdev->dev, "Too big PHY init sequence %d\n", words);
+		return 0;
+	}
+
+	pdata->phy_init_seq = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
+	if (!pdata->phy_init_seq) {
+		dev_warn(&pdev->dev, "No space for PHY init sequence\n");
+		return 0;
+	}
+
+	ret = of_property_read_u32_array(node, "qcom,phy-init-sequence",
+					 pdata->phy_init_seq, words);
+	if (!ret)
+		pdata->phy_init_sz = words;
+
+	return 0;
+}
+
+static int msm_otg_probe(struct platform_device *pdev)
+{
+	struct regulator_bulk_data regs[3];
 	int ret = 0;
+	struct device_node *np = pdev->dev.of_node;
+	struct msm_otg_platform_data *pdata;
 	struct resource *res;
 	struct msm_otg *motg;
 	struct usb_phy *phy;
+	void __iomem *phy_select;
 
-	dev_info(&pdev->dev, "msm_otg probe\n");
-	if (!dev_get_platdata(&pdev->dev)) {
-		dev_err(&pdev->dev, "No platform data given. Bailing out\n");
-		return -ENODEV;
-	}
-
-	motg = kzalloc(sizeof(struct msm_otg), GFP_KERNEL);
+	motg = devm_kzalloc(&pdev->dev, sizeof(struct msm_otg), GFP_KERNEL);
 	if (!motg) {
 		dev_err(&pdev->dev, "unable to allocate msm_otg\n");
 		return -ENOMEM;
 	}
 
-	motg->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
-	if (!motg->phy.otg) {
-		dev_err(&pdev->dev, "unable to allocate msm_otg\n");
-		ret = -ENOMEM;
-		goto free_motg;
+	pdata = dev_get_platdata(&pdev->dev);
+	if (!pdata) {
+		if (!np)
+			return -ENXIO;
+		ret = msm_otg_read_dt(pdev, motg);
+		if (ret)
+			return ret;
 	}
 
-	motg->pdata = dev_get_platdata(&pdev->dev);
+	motg->phy.otg = devm_kzalloc(&pdev->dev, sizeof(struct usb_otg),
+				     GFP_KERNEL);
+	if (!motg->phy.otg) {
+		dev_err(&pdev->dev, "unable to allocate msm_otg\n");
+		return -ENOMEM;
+	}
+
 	phy = &motg->phy;
 	phy->dev = &pdev->dev;
 
-	motg->phy_reset_clk = clk_get(&pdev->dev, "usb_phy_clk");
+	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");
-		ret = PTR_ERR(motg->phy_reset_clk);
-		goto free_motg;
+		return PTR_ERR(motg->phy_reset_clk);
 	}
 
-	motg->clk = clk_get(&pdev->dev, "usb_hs_clk");
+	motg->clk = devm_clk_get(&pdev->dev, np ? "core" : "usb_hs_clk");
 	if (IS_ERR(motg->clk)) {
 		dev_err(&pdev->dev, "failed to get usb_hs_clk\n");
-		ret = PTR_ERR(motg->clk);
-		goto put_phy_reset_clk;
+		return PTR_ERR(motg->clk);
 	}
-	clk_set_rate(motg->clk, 60000000);
 
 	/*
 	 * If USB Core is running its protocol engine based on CORE CLK,
 	 * CORE CLK  must be running at >55Mhz for correct HSUSB
 	 * operation and USB core cannot tolerate frequency changes on
-	 * CORE CLK. For such USB cores, vote for maximum clk frequency
-	 * on pclk source
+	 * CORE CLK.
 	 */
-	 if (motg->pdata->pclk_src_name) {
-		motg->pclk_src = clk_get(&pdev->dev,
-			motg->pdata->pclk_src_name);
-		if (IS_ERR(motg->pclk_src))
-			goto put_clk;
-		clk_set_rate(motg->pclk_src, INT_MAX);
-		clk_prepare_enable(motg->pclk_src);
-	} else
-		motg->pclk_src = ERR_PTR(-ENOENT);
-
-
-	motg->pclk = clk_get(&pdev->dev, "usb_hs_pclk");
+	motg->pclk = devm_clk_get(&pdev->dev, np ? "iface" : "usb_hs_pclk");
 	if (IS_ERR(motg->pclk)) {
 		dev_err(&pdev->dev, "failed to get usb_hs_pclk\n");
-		ret = PTR_ERR(motg->pclk);
-		goto put_pclk_src;
+		return PTR_ERR(motg->pclk);
 	}
 
 	/*
···
 	 * clock is introduced to remove the dependency on AXI
 	 * bus frequency.
 	 */
-	motg->core_clk = clk_get(&pdev->dev, "usb_hs_core_clk");
-	if (IS_ERR(motg->core_clk))
-		motg->core_clk = NULL;
+	motg->core_clk = devm_clk_get(&pdev->dev,
+				      np ? "alt_core" : "usb_hs_core_clk");
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "failed to get platform resource mem\n");
-		ret = -ENODEV;
-		goto put_core_clk;
+	motg->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(motg->regs))
+		return PTR_ERR(motg->regs);
+
+	/*
+	 * NOTE: The PHYs can be multiplexed between the chipidea controller
+	 * and the dwc3 controller, using a single bit. It is important that
+	 * the dwc3 driver does not set this bit in an incompatible way.
+	 */
+	if (motg->phy_number) {
+		phy_select = devm_ioremap_nocache(&pdev->dev, USB2_PHY_SEL, 4);
+		if (IS_ERR(phy_select))
+			return PTR_ERR(phy_select);
+		/* Enable second PHY with the OTG port */
+		writel(0x1, phy_select);
 	}
 
-	motg->regs = ioremap(res->start, resource_size(res));
-	if (!motg->regs) {
-		dev_err(&pdev->dev, "ioremap failed\n");
-		ret = -ENOMEM;
-		goto put_core_clk;
-	}
 	dev_info(&pdev->dev, "OTG regs = %p\n", motg->regs);
 
 	motg->irq = platform_get_irq(pdev, 0);
-	if (!motg->irq) {
+	if (motg->irq < 0) {
 		dev_err(&pdev->dev, "platform_get_irq failed\n");
-		ret = -ENODEV;
-		goto free_regs;
+		return motg->irq;
 	}
+
+	regs[0].supply = "vddcx";
+	regs[1].supply = "v3p3";
+	regs[2].supply = "v1p8";
+
+	ret = devm_regulator_bulk_get(motg->phy.dev, ARRAY_SIZE(regs), regs);
+	if (ret)
+		return ret;
+
+	motg->vddcx = regs[0].consumer;
+	motg->v3p3  = regs[1].consumer;
+	motg->v1p8  = regs[2].consumer;
+
+	clk_set_rate(motg->clk, 60000000);
 
 	clk_prepare_enable(motg->clk);
 	clk_prepare_enable(motg->pclk);
 
+	if (!IS_ERR(motg->core_clk))
+		clk_prepare_enable(motg->core_clk);
+
 	ret = msm_hsusb_init_vddcx(motg, 1);
 	if (ret) {
 		dev_err(&pdev->dev, "hsusb vddcx configuration failed\n");
-		goto free_regs;
+		goto disable_clks;
 	}
 
 	ret = msm_hsusb_ldo_init(motg, 1);
 	if (ret) {
 		dev_err(&pdev->dev, "hsusb vreg configuration failed\n");
-		goto vddcx_exit;
+		goto disable_vddcx;
 	}
-	ret = msm_hsusb_ldo_set_mode(1);
+	ret = msm_hsusb_ldo_set_mode(motg, 1);
 	if (ret) {
 		dev_err(&pdev->dev, "hsusb vreg enable failed\n");
-		goto ldo_exit;
+		goto disable_ldo;
 	}
-
-	if (motg->core_clk)
-		clk_prepare_enable(motg->core_clk);
 
 	writel(0, USB_USBINTR);
 	writel(0, USB_OTGSC);
 
 	INIT_WORK(&motg->sm_work, msm_otg_sm_work);
 	INIT_DELAYED_WORK(&motg->chg_work, msm_chg_detect_work);
-	ret = request_irq(motg->irq, msm_otg_irq, IRQF_SHARED,
+	ret = devm_request_irq(&pdev->dev, motg->irq, msm_otg_irq, IRQF_SHARED,
 					"msm_otg", motg);
 	if (ret) {
 		dev_err(&pdev->dev, "request irq failed\n");
-		goto disable_clks;
+		goto disable_ldo;
 	}
 
-	phy->init = msm_otg_reset;
+	phy->init = msm_phy_init;
 	phy->set_power = msm_otg_set_power;
+	phy->notify_disconnect = msm_phy_notify_disconnect;
+	phy->type = USB_PHY_TYPE_USB2;
 
 	phy->io_ops = &msm_otg_io_ops;
 
···
 	phy->otg->set_host = msm_otg_set_host;
 	phy->otg->set_peripheral = msm_otg_set_peripheral;
 
-	ret = usb_add_phy(&motg->phy, USB_PHY_TYPE_USB2);
+	msm_usb_reset(phy);
+
+	ret = usb_add_phy_dev(&motg->phy);
 	if (ret) {
 		dev_err(&pdev->dev, "usb_add_phy failed\n");
-		goto free_irq;
+		goto disable_ldo;
 	}
 
 	platform_set_drvdata(pdev, motg);
 	device_init_wakeup(&pdev->dev, 1);
 
-	if (motg->pdata->mode == USB_OTG &&
-			motg->pdata->otg_control == OTG_USER_CONTROL) {
+	if (motg->pdata->mode == USB_DR_MODE_OTG &&
+		motg->pdata->otg_control == OTG_USER_CONTROL) {
 		ret = msm_otg_debugfs_init(motg);
 		if (ret)
-			dev_dbg(&pdev->dev, "mode debugfs file is"
-					"not available\n");
+			dev_dbg(&pdev->dev, "Can not create mode change file\n");
 	}
 
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
-free_irq:
-	free_irq(motg->irq, motg);
+
+disable_ldo:
+	msm_hsusb_ldo_init(motg, 0);
+disable_vddcx:
+	msm_hsusb_init_vddcx(motg, 0);
 disable_clks:
 	clk_disable_unprepare(motg->pclk);
 	clk_disable_unprepare(motg->clk);
-ldo_exit:
-	msm_hsusb_ldo_init(motg, 0);
-vddcx_exit:
-	msm_hsusb_init_vddcx(motg, 0);
-free_regs:
-	iounmap(motg->regs);
-put_core_clk:
-	if (motg->core_clk)
-		clk_put(motg->core_clk);
-	clk_put(motg->pclk);
-put_pclk_src:
-	if (!IS_ERR(motg->pclk_src)) {
-		clk_disable_unprepare(motg->pclk_src);
-		clk_put(motg->pclk_src);
-	}
-put_clk:
-	clk_put(motg->clk);
-put_phy_reset_clk:
-	clk_put(motg->phy_reset_clk);
-free_motg:
-	kfree(motg->phy.otg);
-	kfree(motg);
+	if (!IS_ERR(motg->core_clk))
+		clk_disable_unprepare(motg->core_clk);
 	return ret;
 }
 
···
 	pm_runtime_disable(&pdev->dev);
 
 	usb_remove_phy(phy);
-	free_irq(motg->irq, motg);
+	disable_irq(motg->irq);
 
 	/*
 	 * Put PHY in low power mode.
···
 
 	clk_disable_unprepare(motg->pclk);
 	clk_disable_unprepare(motg->clk);
-	if (motg->core_clk)
+	if (!IS_ERR(motg->core_clk))
 		clk_disable_unprepare(motg->core_clk);
-	if (!IS_ERR(motg->pclk_src)) {
-		clk_disable_unprepare(motg->pclk_src);
-		clk_put(motg->pclk_src);
-	}
 	msm_hsusb_ldo_init(motg, 0);
 
-	iounmap(motg->regs);
 	pm_runtime_set_suspended(&pdev->dev);
-
-	clk_put(motg->phy_reset_clk);
-	clk_put(motg->pclk);
-	clk_put(motg->clk);
-	if (motg->core_clk)
-		clk_put(motg->core_clk);
-
-	kfree(motg->phy.otg);
-	kfree(motg);
 
 	return 0;
 }
···
 };
 
 static struct platform_driver msm_otg_driver = {
+	.probe = msm_otg_probe,
 	.remove = msm_otg_remove,
 	.driver = {
 		.name = DRIVER_NAME,
 		.owner = THIS_MODULE,
 		.pm = &msm_otg_dev_pm_ops,
+		.of_match_table = msm_otg_dt_match,
 	},
 };
 
-module_platform_driver_probe(msm_otg_driver, msm_otg_probe);
+module_platform_driver(msm_otg_driver);
 
 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("MSM USB transceiver driver");

drivers/usb/phy/phy-ulpi.c

···
 	ULPI_INFO(ULPI_ID(0x04cc, 0x1504), "NXP ISP1504"),
 	ULPI_INFO(ULPI_ID(0x0424, 0x0006), "SMSC USB331x"),
 	ULPI_INFO(ULPI_ID(0x0424, 0x0007), "SMSC USB3320"),
+	ULPI_INFO(ULPI_ID(0x0424, 0x0009), "SMSC USB334x"),
 	ULPI_INFO(ULPI_ID(0x0451, 0x1507), "TI TUSB1210"),
 };
 

include/linux/usb/composite.h

···
 struct usb_configuration;
 
 /**
+ * struct usb_os_desc_ext_prop - describes one "Extended Property"
+ * @entry: used to keep a list of extended properties
+ * @type: Extended Property type
+ * @name_len: Extended Property unicode name length, including terminating '\0'
+ * @name: Extended Property name
+ * @data_len: Length of Extended Property blob (for unicode store double len)
+ * @data: Extended Property blob
+ * @item: Represents this Extended Property in configfs
+ */
+struct usb_os_desc_ext_prop {
+	struct list_head	entry;
+	u8			type;
+	int			name_len;
+	char			*name;
+	int			data_len;
+	char			*data;
+	struct config_item	item;
+};
+
+/**
+ * struct usb_os_desc - describes OS descriptors associated with one interface
+ * @ext_compat_id: 16 bytes of "Compatible ID" and "Subcompatible ID"
+ * @ext_prop: Extended Properties list
+ * @ext_prop_len: Total length of Extended Properties blobs
+ * @ext_prop_count: Number of Extended Properties
+ * @opts_mutex: Optional mutex protecting config data of a usb_function_instance
+ * @group: Represents OS descriptors associated with an interface in configfs
+ * @owner: Module associated with this OS descriptor
+ */
+struct usb_os_desc {
+	char			*ext_compat_id;
+	struct list_head	ext_prop;
+	int			ext_prop_len;
+	int			ext_prop_count;
+	struct mutex		*opts_mutex;
+	struct config_group	group;
+	struct module		*owner;
+};
+
+/**
+ * struct usb_os_desc_table - describes OS descriptors associated with one
+ * interface of a usb_function
+ * @if_id: Interface id
+ * @os_desc: "Extended Compatibility ID" and "Extended Properties" of the
+ *	interface
+ *
+ * Each interface can have at most one "Extended Compatibility ID" and a
+ * number of "Extended Properties".
+ */
+struct usb_os_desc_table {
+	int			if_id;
+	struct usb_os_desc	*os_desc;
+};
+
+/**
  * struct usb_function - describes one function of a configuration
  * @name: For diagnostics, identifies the function.
  * @strings: tables of strings, keyed by identifiers assigned during bind()
···
  *	be available at super speed.
  * @config: assigned when @usb_add_function() is called; this is the
  *	configuration with which this function is associated.
+ * @os_desc_table: Table of (interface id, os descriptors) pairs. The function
+ *	can expose more than one interface. If an interface is a member of
+ *	an IAD, only the first interface of IAD has its entry in the table.
+ * @os_desc_n: Number of entries in os_desc_table
  * @bind: Before the gadget can register, all of its functions bind() to the
  *	available resources including string and interface identifiers used
  *	in interface or class descriptors; endpoints; I/O buffers; and so on.
···
 	struct usb_descriptor_header	**ss_descriptors;
 
 	struct usb_configuration	*config;
+
+	struct usb_os_desc_table	*os_desc_table;
+	unsigned			os_desc_n;
 
 	/* REVISIT:  bind() functions can be marked __init, which
 	 * makes trouble for section mismatch analysis.  See if
···
 extern void usb_composite_setup_continue(struct usb_composite_dev *cdev);
 extern int composite_dev_prepare(struct usb_composite_driver *composite,
 		struct usb_composite_dev *cdev);
+extern int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
+					 struct usb_ep *ep0);
 void composite_dev_cleanup(struct usb_composite_dev *cdev);
 
 static inline struct usb_composite_driver *to_cdriver(
···
 	return container_of(gdrv, struct usb_composite_driver, gadget_driver);
 }
 
+#define OS_STRING_QW_SIGN_LEN		14
+#define OS_STRING_IDX			0xEE
+
 /**
  * struct usb_composite_device - represents one composite usb gadget
  * @gadget: read-only, abstracts the gadget's usb peripheral controller
  * @req: used for control responses; buffer is pre-allocated
+ * @os_desc_req: used for OS descriptors responses; buffer is pre-allocated
  * @config: the currently active configuration
+ * @qw_sign: qwSignature part of the OS string
+ * @b_vendor_code: bMS_VendorCode part of the OS string
+ * @use_os_string: false by default, interested gadgets set it
+ * @os_desc_config: the configuration to be used with OS descriptors
  *
  * One of these devices is allocated and initialized before the
  * associated device driver's bind() is called.
···
 struct usb_composite_dev {
 	struct usb_gadget		*gadget;
 	struct usb_request		*req;
+	struct usb_request		*os_desc_req;
 
 	struct usb_configuration	*config;
+
+	/* OS String is a custom (yet popular) extension to the USB standard. */
+	u8				qw_sign[OS_STRING_QW_SIGN_LEN];
+	u8				b_vendor_code;
+	struct usb_configuration	*os_desc_config;
+	unsigned int			use_os_string:1;
 
 	/* private: */
 	/* internals */

include/linux/usb/msm_hsusb.h

···
 #include <linux/clk.h>
 
 /**
- * Supported USB modes
- *
- * USB_PERIPHERAL       Only peripheral mode is supported.
- * USB_HOST             Only host mode is supported.
- * USB_OTG              OTG mode is supported.
- *
- */
-enum usb_mode_type {
-	USB_NONE = 0,
-	USB_PERIPHERAL,
-	USB_HOST,
-	USB_OTG,
-};
-
-/**
  * OTG control
  *
  * OTG_NO_CONTROL	Id/VBUS notifications not required. Useful in host
···
 /**
  * struct msm_otg_platform_data - platform device data
  *              for msm_otg driver.
- * @phy_init_seq: PHY configuration sequence. val, reg pairs
- *              terminated by -1.
+ * @phy_init_seq: PHY configuration sequence values. Value of -1 is reserved as
+ *              "do not overwrite default vaule at this address".
+ * @phy_init_sz: PHY configuration sequence size.
  * @vbus_power: VBUS power on/off routine.
  * @power_budget: VBUS power budget in mA (0 will be treated as 500mA).
  * @mode: Supported mode (OTG/peripheral/host).
  * @otg_control: OTG switch controlled by user/Id pin
- * @default_mode: Default operational mode. Applicable only if
- *              OTG switch is controller by user.
- * @pclk_src_name: pclk is derived from ebi1_usb_clk in case of 7x27 and 8k
- *              dfab_usb_hs_clk in case of 8660 and 8960.
  */
 struct msm_otg_platform_data {
 	int *phy_init_seq;
+	int phy_init_sz;
 	void (*vbus_power)(bool on);
 	unsigned power_budget;
-	enum usb_mode_type mode;
+	enum usb_dr_mode mode;
 	enum otg_control_type otg_control;
-	enum usb_mode_type default_mode;
 	enum msm_usb_phy_type phy_type;
 	void (*setup_gpio)(enum usb_otg_state state);
-	char *pclk_src_name;
 	int (*link_clk_reset)(struct clk *link_clk, bool assert);
 	int (*phy_clk_reset)(struct clk *phy_clk);
 };
···
  * @irq: IRQ number assigned for HSUSB controller.
  * @clk: clock struct of usb_hs_clk.
  * @pclk: clock struct of usb_hs_pclk.
- * @pclk_src: pclk source for voting.
  * @phy_reset_clk: clock struct of usb_phy_clk.
  * @core_clk: clock struct of usb_hs_core_clk.
  * @regs: ioremapped register base address.
···
 	int irq;
 	struct clk *clk;
 	struct clk *pclk;
-	struct clk *pclk_src;
 	struct clk *phy_reset_clk;
 	struct clk *core_clk;
 	void __iomem *regs;
···
 	atomic_t in_lpm;
 	int async_int;
 	unsigned cur_power;
+	int phy_number;
 	struct delayed_work chg_work;
 	enum usb_chg_state chg_state;
 	enum usb_chg_type chg_type;
 	u8 dcd_retries;
+	struct regulator *v3p3;
+	struct regulator *v1p8;
+	struct regulator *vddcx;
+
+	struct reset_control *phy_rst;
+	struct reset_control *link_rst;
+	int vdd_levels[3];
 };
 
 #endif

include/linux/usb/msm_hsusb_hw.h

···
 #ifndef __LINUX_USB_GADGET_MSM72K_UDC_H__
 #define __LINUX_USB_GADGET_MSM72K_UDC_H__
 
+/* USB phy selector - in TCSR address range */
+#define USB2_PHY_SEL         0xfd4ab000
+
 #define USB_AHBBURST         (MSM_USB_BASE + 0x0090)
 #define USB_AHBMODE          (MSM_USB_BASE + 0x0098)
 #define USB_CAPLENGTH        (MSM_USB_BASE + 0x0100) /* 8 bit */
···
 #define USB_OTGSC            (MSM_USB_BASE + 0x01A4)
 #define USB_USBMODE          (MSM_USB_BASE + 0x01A8)
 #define USB_PHY_CTRL         (MSM_USB_BASE + 0x0240)
+#define USB_PHY_CTRL2        (MSM_USB_BASE + 0x0278)
 
 #define USBCMD_RESET   2
 #define USB_USBINTR          (MSM_USB_BASE + 0x0148)
 
 #define PORTSC_PHCD            (1 << 23) /* phy suspend mode */
-#define PORTSC_PTS_MASK         (3 << 30)
-#define PORTSC_PTS_ULPI         (3 << 30)
+#define PORTSC_PTS_MASK        (3 << 30)
+#define PORTSC_PTS_ULPI        (2 << 30)
+#define PORTSC_PTS_SERIAL      (3 << 30)
 
 #define USB_ULPI_VIEWPORT    (MSM_USB_BASE + 0x0170)
 #define ULPI_RUN              (1 << 30)
···
 #define ULPI_DATA(n)          ((n) & 255)
 #define ULPI_DATA_READ(n)     (((n) >> 8) & 255)
 
+/* synopsys 28nm phy registers */
+#define ULPI_PWR_CLK_MNG_REG	0x88
+#define OTG_COMP_DISABLE	BIT(0)
+
 #define ASYNC_INTR_CTRL         (1 << 29) /* Enable async interrupt */
 #define ULPI_STP_CTRL           (1 << 30) /* Block communication with PHY */
 #define PHY_RETEN               (1 << 1) /* PHY retention enable/disable */
+#define PHY_POR_ASSERT		(1 << 0) /* USB2 28nm PHY POR ASSERT */
 
 /* OTG definitions */
 #define OTGSC_INTSTS_MASK	(0x7f << 16)

include/linux/usb/usb_phy_gen_xceiv.h include/linux/usb/usb_phy_generic.h

···
 
 #include <linux/usb/otg.h>
 
-struct usb_phy_gen_xceiv_platform_data {
+struct usb_phy_generic_platform_data {
 	enum usb_phy_type type;
 	unsigned long clk_rate;
 
···
 	int gpio_reset;
 };
 
-#if defined(CONFIG_NOP_USB_XCEIV) || (defined(CONFIG_NOP_USB_XCEIV_MODULE) && defined(MODULE))
+#if IS_ENABLED(CONFIG_NOP_USB_XCEIV)
 /* sometimes transceivers are accessed only through e.g. ULPI */
-extern void usb_nop_xceiv_register(void);
-extern void usb_nop_xceiv_unregister(void);
+extern struct platform_device *usb_phy_generic_register(void);
+extern void usb_phy_generic_unregister(struct platform_device *);
 #else
-static inline void usb_nop_xceiv_register(void)
+static inline struct platform_device *usb_phy_generic_register(void)
 {
+	return NULL;
 }
 
-static inline void usb_nop_xceiv_unregister(void)
+static inline void usb_phy_generic_unregister(struct platform_device *pdev)
 {
 }
 #endif

tools/usb/ffs-aio-example/multibuff/device_app/aio_multibuff.c

···
+#define _BSD_SOURCE /* for endian.h */
+
+#include <endian.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/poll.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <sys/eventfd.h>
+
+#include "libaio.h"
+#define IOCB_FLAG_RESFD         (1 << 0)
+
+#include <linux/usb/functionfs.h>
+
+#define BUF_LEN		8192
+#define BUFS_MAX	128
+#define AIO_MAX		(BUFS_MAX*2)
+
+/******************** Descriptors and Strings *******************************/
+
+static const struct {
+	struct usb_functionfs_descs_head header;
+	struct {
+		struct usb_interface_descriptor intf;
+		struct usb_endpoint_descriptor_no_audio bulk_sink;
+		struct usb_endpoint_descriptor_no_audio bulk_source;
+	} __attribute__ ((__packed__)) fs_descs, hs_descs;
+} __attribute__ ((__packed__)) descriptors = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC),
+		.length = htole32(sizeof(descriptors)),
+		.fs_count = 3,
+		.hs_count = 3,
+	},
+	.fs_descs = {
+		.intf = {
+			.bLength = sizeof(descriptors.fs_descs.intf),
+			.bDescriptorType = USB_DT_INTERFACE,
+			.bNumEndpoints = 2,
+			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+			.iInterface = 1,
+		},
+		.bulk_sink = {
+			.bLength = sizeof(descriptors.fs_descs.bulk_sink),
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 1 | USB_DIR_IN,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+		},
+		.bulk_source = {
+			.bLength = sizeof(descriptors.fs_descs.bulk_source),
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 2 | USB_DIR_OUT,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+		},
+	},
+	.hs_descs = {
+		.intf = {
+			.bLength = sizeof(descriptors.hs_descs.intf),
+			.bDescriptorType = USB_DT_INTERFACE,
+			.bNumEndpoints = 2,
+			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+			.iInterface = 1,
+		},
+		.bulk_sink = {
+			.bLength = sizeof(descriptors.hs_descs.bulk_sink),
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 1 | USB_DIR_IN,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+			.wMaxPacketSize = htole16(512),
+		},
+		.bulk_source = {
+			.bLength = sizeof(descriptors.hs_descs.bulk_source),
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 2 | USB_DIR_OUT,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+			.wMaxPacketSize = htole16(512),
+		},
+	},
+};
+
+#define STR_INTERFACE "AIO Test"
+
+static const struct {
+	struct usb_functionfs_strings_head header;
+	struct {
+		__le16 code;
+		const char str1[sizeof(STR_INTERFACE)];
+	} __attribute__ ((__packed__)) lang0;
+} __attribute__ ((__packed__)) strings = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_STRINGS_MAGIC),
+		.length = htole32(sizeof(strings)),
+		.str_count = htole32(1),
+		.lang_count = htole32(1),
+	},
+	.lang0 = {
+		htole16(0x0409), /* en-us */
+		STR_INTERFACE,
+	},
+};
+
+/********************** Buffer structure *******************************/
+
+struct io_buffer {
+	struct iocb **iocb;
+	unsigned char **buf;
+	unsigned cnt;
+	unsigned len;
+	unsigned requested;
+};
+
+/******************** Endpoints handling *******************************/
+
+static void display_event(struct usb_functionfs_event *event)
+{
+	static const char *const names[] = {
+		[FUNCTIONFS_BIND] = "BIND",
+		[FUNCTIONFS_UNBIND] = "UNBIND",
+		[FUNCTIONFS_ENABLE] = "ENABLE",
+		[FUNCTIONFS_DISABLE] = "DISABLE",
+		[FUNCTIONFS_SETUP] = "SETUP",
+		[FUNCTIONFS_SUSPEND] = "SUSPEND",
+		[FUNCTIONFS_RESUME] = "RESUME",
+	};
+	switch (event->type) {
+	case FUNCTIONFS_BIND:
+	case FUNCTIONFS_UNBIND:
+	case FUNCTIONFS_ENABLE:
+	case FUNCTIONFS_DISABLE:
+	case FUNCTIONFS_SETUP:
+	case FUNCTIONFS_SUSPEND:
+	case FUNCTIONFS_RESUME:
+		printf("Event %s\n", names[event->type]);
+	}
+}
+
+static void handle_ep0(int ep0, bool *ready)
+{
+	int ret;
+	struct usb_functionfs_event event;
+
+	ret = read(ep0, &event, sizeof(event));
+	if (!ret) {
+		perror("unable to read event from ep0");
+		return;
+	}
+	display_event(&event);
+	switch (event.type) {
+	case FUNCTIONFS_SETUP:
+		if (event.u.setup.bRequestType & USB_DIR_IN)
+			write(ep0, NULL, 0);
+		else
+			read(ep0, NULL, 0);
+		break;
+
+	case FUNCTIONFS_ENABLE:
+		*ready = true;
+		break;
+
+	case FUNCTIONFS_DISABLE:
+		*ready = false;
+		break;
+
+	default:
+		break;
+	}
+}
+
+void init_bufs(struct io_buffer *iobuf, unsigned n, unsigned len)
+{
+	unsigned i;
+	iobuf->buf = malloc(n*sizeof(*iobuf->buf));
+	iobuf->iocb = malloc(n*sizeof(*iobuf->iocb));
+	iobuf->cnt = n;
+	iobuf->len = len;
+	iobuf->requested = 0;
+	for (i = 0; i < n; ++i) {
+		iobuf->buf[i] = malloc(len*sizeof(**iobuf->buf));
+		iobuf->iocb[i] = malloc(sizeof(**iobuf->iocb));
+	}
+	iobuf->cnt = n;
+}
+
+void delete_bufs(struct io_buffer *iobuf)
+{
+	unsigned i;
+	for (i = 0; i < iobuf->cnt; ++i) {
+		free(iobuf->buf[i]);
+		free(iobuf->iocb[i]);
+	}
+	free(iobuf->buf);
+	free(iobuf->iocb);
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+	unsigned i, j;
+	char *ep_path;
+
+	int ep0, ep1;
+
+	io_context_t ctx;
+
+	int evfd;
+	fd_set rfds;
+
+	struct io_buffer iobuf[2];
+	int actual = 0;
+	bool ready;
+
+	if (argc != 2) {
+		printf("ffs directory not specified!\n");
+		return 1;
+	}
+
+	ep_path = malloc(strlen(argv[1]) + 4 /* "/ep#" */ + 1 /* '\0' */);
+	if (!ep_path) {
+		perror("malloc");
+		return 1;
+	}
+
+	/* open endpoint files */
+	sprintf(ep_path, "%s/ep0", argv[1]);
+	ep0 = open(ep_path, O_RDWR);
+	if (ep0 < 0) {
+		perror("unable to open ep0");
+		return 1;
+	}
+	if (write(ep0, &descriptors, sizeof(descriptors)) < 0) {
+		perror("unable do write descriptors");
+		return 1;
+	}
+	if (write(ep0, &strings, sizeof(strings)) < 0) {
+		perror("unable to write strings");
+		return 1;
+	}
+	sprintf(ep_path, "%s/ep1", argv[1]);
+	ep1 = open(ep_path, O_RDWR);
+	if (ep1 < 0) {
+		perror("unable to open ep1");
+		return 1;
+	}
+
+	free(ep_path);
+
+	memset(&ctx, 0, sizeof(ctx));
+	/* setup aio context to handle up to AIO_MAX requests */
+	if (io_setup(AIO_MAX, &ctx) < 0) {
+		perror("unable to setup aio");
+		return 1;
+	}
+
+	evfd = eventfd(0, 0);
+	if (evfd < 0) {
+		perror("unable to open eventfd");
+		return 1;
+	}
+
+	for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i)
+		init_bufs(&iobuf[i], BUFS_MAX, BUF_LEN);
+
+	while (1) {
+		FD_ZERO(&rfds);
+		FD_SET(ep0, &rfds);
+		FD_SET(evfd, &rfds);
+
+		ret = select(((ep0 > evfd) ? ep0 : evfd)+1,
+			     &rfds, NULL, NULL, NULL);
+		if (ret < 0) {
+			if (errno == EINTR)
+				continue;
+			perror("select");
+			break;
+		}
+
+		if (FD_ISSET(ep0, &rfds))
+			handle_ep0(ep0, &ready);
+
+		/* we are waiting for function ENABLE */
+		if (!ready)
+			continue;
+
+		/*
+		 * when we're preparing new data to submit,
+		 * second buffer being transmitted
+		 */
+		for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i) {
+			if (iobuf[i].requested)
+				continue;
+			/* prepare requests */
+			for (j = 0; j < iobuf[i].cnt; ++j) {
+				io_prep_pwrite(iobuf[i].iocb[j], ep1,
+					       iobuf[i].buf[j],
+					       iobuf[i].len, 0);
+				/* enable eventfd notification */
+				iobuf[i].iocb[j]->u.c.flags |= IOCB_FLAG_RESFD;
+				iobuf[i].iocb[j]->u.c.resfd = evfd;
+			}
+			/* submit table of requests */
+			ret = io_submit(ctx, iobuf[i].cnt, iobuf[i].iocb);
+			if (ret >= 0) {
+				iobuf[i].requested = ret;
+				printf("submit: %d requests buf: %d\n", ret, i);
+			} else
+				perror("unable to submit reqests");
+		}
+
+		/* if event is ready to read */
+		if (!FD_ISSET(evfd, &rfds))
+			continue;
+
+		uint64_t ev_cnt;
+		ret = read(evfd, &ev_cnt, sizeof(ev_cnt));
+		if (ret < 0) {
+			perror("unable to read eventfd");
+			break;
+		}
+
+		struct io_event e[BUFS_MAX];
+		/* we read aio events */
+		ret = io_getevents(ctx, 1, BUFS_MAX, e, NULL);
+		if (ret > 0) /* if we got events */
+			iobuf[actual].requested -= ret;
+
+		/* if all req's from iocb completed */
+		if (!iobuf[actual].requested)
+			actual = (actual + 1)%(sizeof(iobuf)/sizeof(*iobuf));
+	}
+
+	/* free resources */
+
+	for (i = 0; i < sizeof(iobuf)/sizeof(*iobuf); ++i)
+		delete_bufs(&iobuf[i]);
+	io_destroy(ctx);
+
+	close(ep1);
+	close(ep0);
+
+	return 0;
+}

tools/usb/ffs-aio-example/multibuff/host_app/Makefile

···
+CC = gcc
+LIBUSB_CFLAGS = $(shell pkg-config --cflags libusb-1.0)
+LIBUSB_LIBS = $(shell pkg-config --libs libusb-1.0)
+WARNINGS = -Wall -Wextra
+CFLAGS = $(LIBUSB_CFLAGS) $(WARNINGS)
+LDFLAGS = $(LIBUSB_LIBS)
+
+all: test
+%: %.c
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+clean:
+	$(RM) test

tools/usb/ffs-aio-example/multibuff/host_app/test.c

···
+#include <libusb.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#define VENDOR	0x1d6b
+#define PRODUCT	0x0105
+
+/* endpoints indexes */
+
+#define EP_BULK_IN	(1 | LIBUSB_ENDPOINT_IN)
+#define EP_BULK_OUT	(2 | LIBUSB_ENDPOINT_OUT)
+
+#define BUF_LEN		8192
+
+/*
+ * struct test_state - describes test program state
+ * @list: list of devices returned by libusb_get_device_list function
+ * @found: pointer to struct describing tested device
+ * @ctx: context, set to NULL
+ * @handle: handle of tested device
+ * @attached: indicates that device was attached to kernel, and has to be
+ *            reattached at the end of test program
+ */
+
+struct test_state {
+	libusb_device *found;
+	libusb_context *ctx;
+	libusb_device_handle *handle;
+	int attached;
+};
+
+/*
+ * test_init - initialize test program
+ */
+
+int test_init(struct test_state *state)
+{
+	int i, ret;
+	ssize_t cnt;
+	libusb_device **list;
+
+	state->found = NULL;
+	state->ctx = NULL;
+	state->handle = NULL;
+	state->attached = 0;
+
+	ret = libusb_init(&state->ctx);
+	if (ret) {
+		printf("cannot init libusb: %s\n", libusb_error_name(ret));
+		return 1;
+	}
+
+	cnt = libusb_get_device_list(state->ctx, &list);
+	if (cnt <= 0) {
+		printf("no devices found\n");
+		goto error1;
+	}
+
+	for (i = 0; i < cnt; ++i) {
+		libusb_device *dev = list[i];
+		struct libusb_device_descriptor desc;
+		ret = libusb_get_device_descriptor(dev, &desc);
+		if (ret) {
+			printf("unable to get device descriptor: %s\n",
+			       libusb_error_name(ret));
+			goto error2;
+		}
+		if (desc.idVendor == VENDOR && desc.idProduct == PRODUCT) {
+			state->found = dev;
+			break;
+		}
+	}
+
+	if (!state->found) {
+		printf("no devices found\n");
+		goto error2;
+	}
+
+	ret = libusb_open(state->found, &state->handle);
+	if (ret) {
+		printf("cannot open device: %s\n", libusb_error_name(ret));
+		goto error2;
+	}
+
+	if (libusb_claim_interface(state->handle, 0)) {
+		ret = libusb_detach_kernel_driver(state->handle, 0);
+		if (ret) {
+			printf("unable to detach kernel driver: %s\n",
+			       libusb_error_name(ret));
+			goto error3;
+		}
+		state->attached = 1;
+		ret = libusb_claim_interface(state->handle, 0);
+		if (ret) {
+			printf("cannot claim interface: %s\n",
+			       libusb_error_name(ret));
+			goto error4;
+		}
+	}
+
+	return 0;
+
+error4:
+	if (state->attached == 1)
+		libusb_attach_kernel_driver(state->handle, 0);
+
+error3:
+	libusb_close(state->handle);
+
+error2:
+	libusb_free_device_list(list, 1);
+
+error1:
+	libusb_exit(state->ctx);
+	return 1;
+}
+
+/*
+ * test_exit - cleanup test program
+ */
+
+void test_exit(struct test_state *state)
+{
+	libusb_release_interface(state->handle, 0);
+	if (state->attached == 1)
+		libusb_attach_kernel_driver(state->handle, 0);
+	libusb_close(state->handle);
+	libusb_exit(state->ctx);
+}
+
+int main(void)
+{
+	struct test_state state;
+
+	if (test_init(&state))
+		return 1;
+
+	while (1) {
+		static unsigned char buffer[BUF_LEN];
+		int bytes;
+		libusb_bulk_transfer(state.handle, EP_BULK_IN, buffer, BUF_LEN,
+				     &bytes, 500);
+	}
+	test_exit(&state);
+}

tools/usb/ffs-aio-example/simple/device_app/aio_simple.c

···
+#define _BSD_SOURCE /* for endian.h */
+
+#include <endian.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/poll.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <sys/eventfd.h>
+
+#include "libaio.h"
+#define IOCB_FLAG_RESFD         (1 << 0)
+
+#include <linux/usb/functionfs.h>
+
+#define BUF_LEN		8192
+
+/******************** Descriptors and Strings *******************************/
+
+static const struct {
+	struct usb_functionfs_descs_head header;
+	struct {
+		struct usb_interface_descriptor intf;
+		struct usb_endpoint_descriptor_no_audio bulk_sink;
+		struct usb_endpoint_descriptor_no_audio bulk_source;
+	} __attribute__ ((__packed__)) fs_descs, hs_descs;
+} __attribute__ ((__packed__)) descriptors = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_DESCRIPTORS_MAGIC),
+		.length = htole32(sizeof(descriptors)),
+		.fs_count = 3,
+		.hs_count = 3,
+	},
+	.fs_descs = {
+		.intf = {
+			.bLength = sizeof(descriptors.fs_descs.intf),
+			.bDescriptorType = USB_DT_INTERFACE,
+			.bNumEndpoints = 2,
+			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+			.iInterface = 1,
+		},
+		.bulk_sink = {
+			.bLength = sizeof(descriptors.fs_descs.bulk_sink),
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 1 | USB_DIR_IN,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+		},
+		.bulk_source = {
+			.bLength = sizeof(descriptors.fs_descs.bulk_source),
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 2 | USB_DIR_OUT,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+		},
+	},
+	.hs_descs = {
+		.intf = {
+			.bLength = sizeof(descriptors.hs_descs.intf),
+			.bDescriptorType = USB_DT_INTERFACE,
+			.bNumEndpoints = 2,
+			.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+			.iInterface = 1,
+		},
+		.bulk_sink = {
+			.bLength = sizeof(descriptors.hs_descs.bulk_sink),
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 1 | USB_DIR_IN,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+		},
+		.bulk_source = {
+			.bLength = sizeof(descriptors.hs_descs.bulk_source),
+			.bDescriptorType = USB_DT_ENDPOINT,
+			.bEndpointAddress = 2 | USB_DIR_OUT,
+			.bmAttributes = USB_ENDPOINT_XFER_BULK,
+		},
+	},
+};
+
+#define STR_INTERFACE "AIO Test"
+
+static const struct {
+	struct usb_functionfs_strings_head header;
+	struct {
+		__le16 code;
+		const char str1[sizeof(STR_INTERFACE)];
+	} __attribute__ ((__packed__)) lang0;
+} __attribute__ ((__packed__)) strings = {
+	.header = {
+		.magic = htole32(FUNCTIONFS_STRINGS_MAGIC),
+		.length = htole32(sizeof(strings)),
+		.str_count = htole32(1),
+		.lang_count = htole32(1),
+	},
+	.lang0 = {
+		htole16(0x0409), /* en-us */
+		STR_INTERFACE,
+	},
+};
+
+/******************** Endpoints handling *******************************/
+
+static void display_event(struct usb_functionfs_event *event)
+{
+	static const char *const names[] = {
+		[FUNCTIONFS_BIND] = "BIND",
+		[FUNCTIONFS_UNBIND] = "UNBIND",
+		[FUNCTIONFS_ENABLE] = "ENABLE",
+		[FUNCTIONFS_DISABLE] = "DISABLE",
+		[FUNCTIONFS_SETUP] = "SETUP",
+		[FUNCTIONFS_SUSPEND] = "SUSPEND",
+		[FUNCTIONFS_RESUME] = "RESUME",
+	};
+	switch (event->type) {
+	case FUNCTIONFS_BIND:
+	case FUNCTIONFS_UNBIND:
+	case FUNCTIONFS_ENABLE:
+	case FUNCTIONFS_DISABLE:
+	case FUNCTIONFS_SETUP:
+	case FUNCTIONFS_SUSPEND:
+	case FUNCTIONFS_RESUME:
+		printf("Event %s\n", names[event->type]);
+	}
+}
+
+static void handle_ep0(int ep0, bool *ready)
+{
+	struct usb_functionfs_event event;
+	int ret;
+
+	struct pollfd pfds[1];
+	pfds[0].fd = ep0;
+	pfds[0].events = POLLIN;
+
+	ret = poll(pfds, 1, 0);
+
+	if (ret && (pfds[0].revents & POLLIN)) {
+		ret = read(ep0, &event, sizeof(event));
+		if (!ret) {
+			perror("unable to read event from ep0");
+			return;
+		}
+		display_event(&event);
+		switch (event.type) {
+		case FUNCTIONFS_SETUP:
+			if (event.u.setup.bRequestType & USB_DIR_IN)
+				write(ep0, NULL, 0);
+			else
+				read(ep0, NULL, 0);
+			break;
+
+		case FUNCTIONFS_ENABLE:
+			*ready = true;
+			break;
+
+		case FUNCTIONFS_DISABLE:
+			*ready = false;
+			break;
+
+		default:
+			break;
+		}
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	int i, ret;
+	char *ep_path;
+
+	int ep0;
+	int ep[2];
+
+	io_context_t ctx;
+
+	int evfd;
+	fd_set rfds;
+
+	char *buf_in, *buf_out;
+	struct iocb *iocb_in, *iocb_out;
+	int req_in = 0, req_out = 0;
+	bool ready;
+
+	if (argc != 2) {
+		printf("ffs directory not specified!\n");
+		return 1;
+	}
+
+	ep_path = malloc(strlen(argv[1]) + 4 /* "/ep#" */ + 1 /* '\0' */);
+	if (!ep_path) {
+		perror("malloc");
+		return 1;
+	}
+
+	/* open endpoint files */
+	sprintf(ep_path, "%s/ep0", argv[1]);
+	ep0 = open(ep_path, O_RDWR);
+	if (ep0 < 0) {
+		perror("unable to open ep0");
+		return 1;
+	}
+	if (write(ep0, &descriptors, sizeof(descriptors)) < 0) {
+		perror("unable do write descriptors");
+		return 1;
+	}
+	if (write(ep0, &strings, sizeof(strings)) < 0) {
+		perror("unable to write strings");
+		return 1;
+	}
+	for (i = 0; i < 2; ++i) {
+		sprintf(ep_path, "%s/ep%d", argv[1], i+1);
+		ep[i] = open(ep_path, O_RDWR);
+		if (ep[i] < 0) {
+			printf("unable to open ep%d: %s\n", i+1,
+			       strerror(errno));
+			return 1;
+		}
+	}
+
+	free(ep_path);
+
+	memset(&ctx, 0, sizeof(ctx));
+	/* setup aio context to handle up to 2 requests */
+	if (io_setup(2, &ctx) < 0) {
+		perror("unable to setup aio");
+		return 1;
+	}
+
+	evfd = eventfd(0, 0);
+	if (evfd < 0) {
+		perror("unable to open eventfd");
+		return 1;
+	}
+
+	/* alloc buffers and requests */
+	buf_in = malloc(BUF_LEN);
+	buf_out = malloc(BUF_LEN);
+	iocb_in = malloc(sizeof(*iocb_in));
+	iocb_out = malloc(sizeof(*iocb_out));
+
+	while (1) {
+		FD_ZERO(&rfds);
+		FD_SET(ep0, &rfds);
+		FD_SET(evfd, &rfds);
+
+		ret = select(((ep0 > evfd) ? ep0 : evfd)+1,
+			     &rfds, NULL, NULL, NULL);
+		if (ret < 0) {
+			if (errno == EINTR)
+				continue;
+			perror("select");
+			break;
+		}
+
+		if (FD_ISSET(ep0, &rfds))
+			handle_ep0(ep0, &ready);
+
+		/* we are waiting for function ENABLE */
+		if (!ready)
+			continue;
+
+		/* if something was submitted we wait for event */
+		if (FD_ISSET(evfd, &rfds)) {
+			uint64_t ev_cnt;
+			ret = read(evfd, &ev_cnt, sizeof(ev_cnt));
+			if (ret < 0) {
+				perror("unable to read eventfd");
+				break;
+			}
+
+			struct io_event e[2];
+			/* we wait for one event */
+			ret = io_getevents(ctx, 1, 2, e, NULL);
+			/* if we got event */
+			for (i = 0; i < ret; ++i) {
+				if (e[i].obj->aio_fildes == ep[0]) {
+					printf("ev=in; ret=%lu\n", e[i].res);
+					req_in = 0;
+				} else if (e[i].obj->aio_fildes == ep[1]) {
+					printf("ev=out; ret=%lu\n", e[i].res);
+					req_out = 0;
+				}
+			}
+		}
+
+		if (!req_in) { /* if IN transfer not requested*/
+			/* prepare write request */
+			io_prep_pwrite(iocb_in, ep[0], buf_in, BUF_LEN, 0);
+			/* enable eventfd notification */
+			iocb_in->u.c.flags |= IOCB_FLAG_RESFD;
+			iocb_in->u.c.resfd = evfd;
+			/* submit table of requests */
+			ret = io_submit(ctx, 1, &iocb_in);
+			if (ret >= 0) { /* if ret > 0 request is queued */
+				req_in = 1;
+				printf("submit: in\n");
+			} else
+				perror("unable to submit request");
+		}
+		if (!req_out) { /* if OUT transfer not requested */
+			/* prepare read request */
+			io_prep_pread(iocb_out, ep[1], buf_out, BUF_LEN, 0);
+			/* enable eventfs notification */
+			iocb_out->u.c.flags |= IOCB_FLAG_RESFD;
+			iocb_out->u.c.resfd = evfd;
+			/* submit table of requests */
+			ret = io_submit(ctx, 1, &iocb_out);
+			if (ret >= 0) { /* if ret > 0 request is queued */
+				req_out = 1;
+				printf("submit: out\n");
+			} else
+				perror("unable to submit request");
+		}
+	}
+
+	/* free resources */
+
+	io_destroy(ctx);
+
+	free(buf_in);
+	free(buf_out);
+	free(iocb_in);
+	free(iocb_out);
+
+	for (i = 0; i < 2; ++i)
+		close(ep[i]);
+	close(ep0);
+
+	return 0;
+}

tools/usb/ffs-aio-example/simple/host_app/Makefile

···
+CC = gcc
+LIBUSB_CFLAGS = $(shell pkg-config --cflags libusb-1.0)
+LIBUSB_LIBS = $(shell pkg-config --libs libusb-1.0)
+WARNINGS = -Wall -Wextra
+CFLAGS = $(LIBUSB_CFLAGS) $(WARNINGS)
+LDFLAGS = $(LIBUSB_LIBS)
+
+all: test
+%: %.c
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+clean:
+	$(RM) test

tools/usb/ffs-aio-example/simple/host_app/test.c

···
+#include <libusb.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#define VENDOR	0x1d6b
+#define PRODUCT	0x0105
+
+/* endpoints indexes */
+
+#define EP_BULK_IN	(1 | LIBUSB_ENDPOINT_IN)
+#define EP_BULK_OUT	(2 | LIBUSB_ENDPOINT_OUT)
+
+#define BUF_LEN		8192
+
+/*
+ * struct test_state - describes test program state
+ * @list: list of devices returned by libusb_get_device_list function
+ * @found: pointer to struct describing tested device
+ * @ctx: context, set to NULL
+ * @handle: handle of tested device
+ * @attached: indicates that device was attached to kernel, and has to be
+ *            reattached at the end of test program
+ */
+
+struct test_state {
+	libusb_device *found;
+	libusb_context *ctx;
+	libusb_device_handle *handle;
+	int attached;
+};
+
+/*
+ * test_init - initialize test program
+ */
+
+int test_init(struct test_state *state)
+{
+	int i, ret;
+	ssize_t cnt;
+	libusb_device **list;
+
+	state->found = NULL;
+	state->ctx = NULL;
+	state->handle = NULL;
+	state->attached = 0;
+
+	ret = libusb_init(&state->ctx);
+	if (ret) {
+		printf("cannot init libusb: %s\n", libusb_error_name(ret));
+		return 1;
+	}
+
+	cnt = libusb_get_device_list(state->ctx, &list);
+	if (cnt <= 0) {
+		printf("no devices found\n");
+		goto error1;
+	}
+
+	for (i = 0; i < cnt; ++i) {
+		libusb_device *dev = list[i];
+		struct libusb_device_descriptor desc;
+		ret = libusb_get_device_descriptor(dev, &desc);
+		if (ret) {
+			printf("unable to get device descriptor: %s\n",
+			       libusb_error_name(ret));
+			goto error2;
+		}
+		if (desc.idVendor == VENDOR && desc.idProduct == PRODUCT) {
+			state->found = dev;
+			break;
+		}
+	}
+
+	if (!state->found) {
+		printf("no devices found\n");
+		goto error2;
+	}
+
+	ret = libusb_open(state->found, &state->handle);
+	if (ret) {
+		printf("cannot open device: %s\n", libusb_error_name(ret));
+		goto error2;
+	}
+
+	if (libusb_claim_interface(state->handle, 0)) {
+		ret = libusb_detach_kernel_driver(state->handle, 0);
+		if (ret) {
+			printf("unable to detach kernel driver: %s\n",
+			       libusb_error_name(ret));
+			goto error3;
+		}
+		state->attached = 1;
+		ret = libusb_claim_interface(state->handle, 0);
+		if (ret) {
+			printf("cannot claim interface: %s\n",
+			       libusb_error_name(ret));
+			goto error4;
+		}
+	}
+
+	return 0;
+
+error4:
+	if (state->attached == 1)
+		libusb_attach_kernel_driver(state->handle, 0);
+
+error3:
+	libusb_close(state->handle);
+
+error2:
+	libusb_free_device_list(list, 1);
+
+error1:
+	libusb_exit(state->ctx);
+	return 1;
+}
+
+/*
+ * test_exit - cleanup test program
+ */
+
+void test_exit(struct test_state *state)
+{
+	libusb_release_interface(state->handle, 0);
+	if (state->attached == 1)
+		libusb_attach_kernel_driver(state->handle, 0);
+	libusb_close(state->handle);
+	libusb_exit(state->ctx);
+}
+
+int main(void)
+{
+	struct test_state state;
+
+	if (test_init(&state))
+		return 1;
+
+	while (1) {
+		static unsigned char buffer[BUF_LEN];
+		int bytes;
+		libusb_bulk_transfer(state.handle, EP_BULK_IN, buffer, BUF_LEN,
+				     &bytes, 500);
+		libusb_bulk_transfer(state.handle, EP_BULK_OUT, buffer, BUF_LEN,
+				     &bytes, 500);
+	}
+	test_exit(&state);
+}