Merge tag 'hid-for-linus-2024111801' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid

Pull HID updates from Jiri Kosina:

- improvement in the way hid-bpf coexists with specific drivers (others
than hid-generic) that are already bound to devices (Benjamin
Tissoires)

- removal of three way-too-aggressive BUG_ON()s from HID drivers (He
Lugang)

- assorted cleanups and small code fixes to HID core (Dmitry Torokhov,
Yan Zhen, Nathan Chancellor, Andy Shevchenko)

- support for Corsair Void headset family (Stuart Hayhurst)

- Support for Goodix GT7986U SPI (Charles Wang)

- initial vendor-specific driver for Kysona, currently adding support
for Kysona M600 (Lode Willems)

- other assorted code cleanups and small bugfixes all over the place

* tag 'hid-for-linus-2024111801' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid: (40 commits)
HID: multitouch: make mt_set_mode() less cryptic
HID: hid-goodix-spi: Add OF supports
dt-bindings: input: Goodix GT7986U SPI HID Touchscreen
HID: hyperv: streamline driver probe to avoid devres issues
HID: magicmouse: Apple Magic Trackpad 2 USB-C driver support
HID: rmi: Add select RMI4_F3A in Kconfig
HID: wacom: Interpret tilt data from Intuos Pro BT as signed values
HID: steelseries: Add capacity_level mapping
HID: steelseries: Fix battery requests stopping after some time
HID: hid-goodix: Fix HID get/set feature operation overwritten problem
HID: hid-goodix: Return 0 when receiving an empty HID feature package
HID: bpf: drop use of Logical|Physical|UsageRange
HID: bpf: Fix Rapoo M50 Plus Silent side buttons
HID: bpf: Fix NKRO on Mistel MD770
HID: replace BUG_ON() with WARN_ON()
HID: wacom: Set eraser status when either 'Eraser' or 'Invert' usage is set
HID: Kysona: add basic online status
HID: Kysona: check battery status every 5s using a workqueue
HID: Kysona: Add basic battery reporting for Kysona M600
HID: Add IDs for Kysona
...

Documentation/ABI/testing/sysfs-driver-hid-corsair-void

···
+What:		/sys/bus/hid/drivers/hid-corsair-void/<dev>/fw_version_headset
+Date:		January 2024
+KernelVersion:	6.13
+Contact:	Stuart Hayhurst <[e-mail]>
+Description:	(R) The firmware version of the headset
+			* Returns -ENODATA if no version was reported
+
+What:		/sys/bus/hid/drivers/hid-corsair-void/<dev>/fw_version_receiver
+Date:		January 2024
+KernelVersion:	6.13
+Contact:	Stuart Hayhurst <[e-mail]>
+Description:	(R) The firmware version of the receiver
+
+What:		/sys/bus/hid/drivers/hid-corsair-void/<dev>/microphone_up
+Date:		July 2023
+KernelVersion:	6.13
+Contact:	Stuart Hayhurst <[e-mail]>
+Description:	(R) Get the physical position of the microphone
+			* 1 -> Microphone up
+			* 0 -> Microphone down
+
+What:		/sys/bus/hid/drivers/hid-corsair-void/<dev>/send_alert
+Date:		July 2023
+KernelVersion:	6.13
+Contact:	Stuart Hayhurst <[e-mail]>
+Description:	(W) Play a built-in notification from the headset (0 / 1)
+
+What:		/sys/bus/hid/drivers/hid-corsair-void/<dev>/set_sidetone
+Date:		December 2023
+KernelVersion:	6.13
+Contact:	Stuart Hayhurst <[e-mail]>
+Description:	(W) Set the sidetone volume (0 - sidetone_max)
+
+What:		/sys/bus/hid/drivers/hid-corsair-void/<dev>/sidetone_max
+Date:		July 2024
+KernelVersion:	6.13
+Contact:	Stuart Hayhurst <[e-mail]>
+Description:	(R) Report the maximum sidetone volume

Documentation/devicetree/bindings/input/goodix,gt7986u-spifw.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/goodix,gt7986u-spifw.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Goodix GT7986U SPI HID Touchscreen
+
+maintainers:
+  - Charles Wang <[e-mail]>
+
+description: |
+  Supports the Goodix GT7986U touchscreen.
+  This touch controller reports data packaged according to the HID protocol
+  over the SPI bus, but it is incompatible with Microsoft's HID-over-SPI protocol.
+
+  NOTE: these bindings are distinct from the bindings used with the
+  GT7986U when the chip is running I2C firmware. This is because there's
+  not a single device that talks over both I2C and SPI but rather
+  distinct touchscreens that happen to be built with the same ASIC but
+  that are distinct products running distinct firmware.
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    enum:
+      - goodix,gt7986u-spifw
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  spi-max-frequency: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - reset-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      touchscreen@0 {
+        compatible = "goodix,gt7986u-spifw";
+        reg = <0>;
+        interrupt-parent = <&gpio>;
+        interrupts = <25 IRQ_TYPE_LEVEL_LOW>;
+        reset-gpios = <&gpio1 1 GPIO_ACTIVE_LOW>;
+        spi-max-frequency = <10000000>;
+      };
+    };
+
+...

drivers/hid/Kconfig

···
 config HID_CORSAIR
 	tristate "Corsair devices"
 	depends on USB_HID && LEDS_CLASS
+	select POWER_SUPPLY
 	help
 	Support for Corsair devices that are not fully compliant with the
 	HID standard.
+	Support for Corsair Void headsets.
 
 	Supported devices:
 	- Vengeance K90
 	- Scimitar PRO RGB
+	- Corsair Void headsets
 
 config HID_COUGAR
 	tristate "Cougar devices"
···
 	- EasyPen i405X tablet
 	- MousePen i608X tablet
 	- EasyPen M610X tablet
+
+config HID_KYSONA
+	tristate "Kysona devices"
+	depends on USB_HID
+	help
+	Support for Kysona mice.
+
+	Say Y here if you have a Kysona M600 mouse
+	and want to be able to read its battery capacity.
 
 config HID_UCLOGIC
 	tristate "UC-Logic"
···
 	select RMI4_F11
 	select RMI4_F12
 	select RMI4_F30
+	select RMI4_F3A
 	help
 	Support for Synaptics RMI4 touchpads.
 	Say Y here if you have a Synaptics RMI4 touchpads over i2c-hid or usbhid

drivers/hid/Makefile

···
 obj-$(CONFIG_HID_CHERRY)	+= hid-cherry.o
 obj-$(CONFIG_HID_CHICONY)	+= hid-chicony.o
 obj-$(CONFIG_HID_CMEDIA)	+= hid-cmedia.o
-obj-$(CONFIG_HID_CORSAIR)	+= hid-corsair.o
+obj-$(CONFIG_HID_CORSAIR)	+= hid-corsair.o hid-corsair-void.o
 obj-$(CONFIG_HID_COUGAR)	+= hid-cougar.o
 obj-$(CONFIG_HID_CP2112)	+= hid-cp2112.o
 obj-$(CONFIG_HID_CYPRESS)	+= hid-cypress.o
···
 obj-$(CONFIG_HID_KENSINGTON)	+= hid-kensington.o
 obj-$(CONFIG_HID_KEYTOUCH)	+= hid-keytouch.o
 obj-$(CONFIG_HID_KYE)		+= hid-kye.o
+obj-$(CONFIG_HID_KYSONA)	+= hid-kysona.o
 obj-$(CONFIG_HID_LCPOWER)	+= hid-lcpower.o
 obj-$(CONFIG_HID_LENOVO)	+= hid-lenovo.o
 obj-$(CONFIG_HID_LETSKETCH)	+= hid-letsketch.o

drivers/hid/bpf/hid_bpf_dispatch.c

···
 }
 EXPORT_SYMBOL_GPL(dispatch_hid_bpf_output_report);
 
-u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, const u8 *rdesc, unsigned int *size)
+const u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, const u8 *rdesc, unsigned int *size)
 {
 	int ret;
 	struct hid_bpf_ctx_kern ctx_kern = {
···
 
  ignore_bpf:
 	kfree(ctx_kern.data);
-	return kmemdup(rdesc, *size, GFP_KERNEL);
+	return rdesc;
 }
 EXPORT_SYMBOL_GPL(call_hid_bpf_rdesc_fixup);
 
···
 
 int hid_bpf_reconnect(struct hid_device *hdev)
 {
-	if (!test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status))
+	if (!test_and_set_bit(ffs(HID_STAT_REPROBED), &hdev->status)) {
+		/* trigger call to call_hid_bpf_rdesc_fixup() during the next probe */
+		hdev->bpf_rsize = 0;
 		return device_reprobe(&hdev->dev);
+	}
 
 	return 0;
 }

drivers/hid/bpf/hid_bpf_struct_ops.c

···
 		WRITE_RANGE(hid_device, name, true),
 		WRITE_RANGE(hid_device, uniq, true),
 		WRITE_RANGE(hid_device, phys, true),
+		WRITE_RANGE(hid_device, quirks, false),
 	};
 #undef WRITE_RANGE
 	const struct btf_type *state = NULL;

drivers/hid/bpf/progs/Huion__Dial-2.bpf.c

···
 	CollectionApplication(
 		// -- Byte 0 in report
 		ReportId(PAD_REPORT_ID)
-		LogicalRange_i8(0, 1)
+		LogicalMaximum_i8(0)
+		LogicalMaximum_i8(1)
 		UsagePage_Digitizers
 		Usage_Dig_TabletFunctionKeys
 		CollectionPhysical(
···
 			Input(Var|Abs)
 			// Byte 4 in report is the dial
 			Usage_GD_Wheel
-			LogicalRange_i8(-1, 1)
+			LogicalMinimum_i8(-1)
+			LogicalMaximum_i8(1)
 			ReportCount(1)
 			ReportSize(8)
 			Input(Var|Rel)
 			// Byte 5 is the button state
 			UsagePage_Button
-			UsageRange_i8(0x01, 0x8)
-			LogicalRange_i8(0x0, 0x1)
+			UsageMinimum_i8(0x01)
+			UsageMaximum_i8(0x08)
+			LogicalMinimum_i8(0x0)
+			LogicalMaximum_i8(0x1)
 			ReportCount(7)
 			ReportSize(1)
 			Input(Var|Abs)
···
 			Usage_Dig_TipSwitch
 			Usage_Dig_BarrelSwitch
 			Usage_Dig_SecondaryBarrelSwitch // maps eraser to BTN_STYLUS2
-			LogicalRange_i8(0, 1)
+			LogicalMinimum_i8(0)
+			LogicalMaximum_i8(1)
 			ReportSize(1)
 			ReportCount(3)
 			Input(Var|Abs)
···
 				UsagePage_GenericDesktop
 				Unit(cm)
 				UnitExponent(-1)
-				PhysicalRange_i16(0, 266)
-				LogicalRange_i16(0, 32767)
+				PhysicalMinimum_i16(0)
+				PhysicalMaximum_i16(266)
+				LogicalMinimum_i16(0)
+				LogicalMaximum_i16(32767)
 				Usage_GD_X
 				Input(Var|Abs) // Bytes 2+3
-				PhysicalRange_i16(0, 166)
-				LogicalRange_i16(0, 32767)
+				PhysicalMinimum_i16(0)
+				PhysicalMaximum_i16(166)
+				LogicalMinimum_i16(0)
+				LogicalMaximum_i16(32767)
 				Usage_GD_Y
 				Input(Var|Abs) // Bytes 4+5
 			)
 			UsagePage_Digitizers
 			Usage_Dig_TipPressure
-			LogicalRange_i16(0, 8191)
+			LogicalMinimum_i16(0)
+			LogicalMaximum_i16(8191)
 			Input(Var|Abs) // Byte 6+7
 			ReportSize(8)
 			ReportCount(2)
-			LogicalRange_i8(-60, 60)
+			LogicalMinimum_i8(-60)
+			LogicalMaximum_i8(60)
 			Usage_Dig_XTilt
 			Usage_Dig_YTilt
 			Input(Var|Abs) // Byte 8+9
···
 		Usage_Dig_Pen
 		CollectionPhysical(
 			// Byte 1 are the buttons
-			LogicalRange_i8(0, 1)
+			LogicalMinimum_i8(0)
+			LogicalMaximum_i8(1)
 			ReportSize(1)
 			Usage_Dig_TipSwitch
 			Usage_Dig_BarrelSwitch
···
 				UnitExponent(-1)
 				// Note: reported logical range differs
 				// from the pen report ID for x and y
-				LogicalRange_i16(0, 53340)
-				PhysicalRange_i16(0, 266)
+				LogicalMinimum_i16(0)
+				LogicalMaximum_i16(53340)
+				PhysicalMinimum_i16(0)
+				PhysicalMaximum_i16(266)
 				// Bytes 2/3 in report
 				Usage_GD_X
 				Input(Var|Abs)
-				LogicalRange_i16(0, 33340)
-				PhysicalRange_i16(0, 166)
+				LogicalMinimum_i16(0)
+				LogicalMaximum_i16(33340)
+				PhysicalMinimum_i16(0)
+				PhysicalMaximum_i16(166)
 				// Bytes 4/5 in report
 				Usage_GD_Y
 				Input(Var|Abs)
 			)
 			// Bytes 6/7 in report
-			LogicalRange_i16(0, 8191)
+			LogicalMinimum_i16(0)
+			LogicalMaximum_i16(8191)
 			Usage_Dig_TipPressure
 			Input(Var|Abs)
 			// Bytes 8/9 in report
 			ReportCount(1) // Padding
 			Input(Const)
-			LogicalRange_i8(-60, 60)
+			LogicalMinimum_i8(-60)
+			LogicalMaximum_i8(60)
 			// Byte 10 in report
 			Usage_Dig_XTilt
 			// Byte 11 in report
···
 	CollectionApplication(
 		// Byte 0
 		ReportId(PAD_REPORT_ID)
-		LogicalRange_i8(0, 1)
+		LogicalMinimum_i8(0)
+		LogicalMaximum_i8(1)
 		UsagePage_Digitizers
 		Usage_Dig_TabletFunctionKeys
 		CollectionPhysical(
···
 			Input(Var|Abs)
 			// Byte 4 is the button state
 			UsagePage_Button
-			UsageRange_i8(0x01, 0x8)
-			LogicalRange_i8(0x0, 0x1)
+			UsageMinimum_i8(0x1)
+			UsageMaximum_i8(0x8)
+			LogicalMinimum_i8(0x0)
+			LogicalMaximum_i8(0x1)
 			ReportCount(8)
 			ReportSize(1)
 			Input(Var|Abs)
 			// Byte 5 is the top dial
 			UsagePage_GenericDesktop
 			Usage_GD_Wheel
-			LogicalRange_i8(-1, 1)
+			LogicalMinimum_i8(-1)
+			LogicalMaximum_i8(1)
 			ReportCount(1)
 			ReportSize(8)
 			Input(Var|Rel)

drivers/hid/bpf/progs/Huion__Inspiroy-2-S.bpf.c

···
 	CollectionApplication(
 		// -- Byte 0 in report
 		ReportId(PAD_REPORT_ID)
-		LogicalRange_i8(0, 1)
+		LogicalMinimum_i8(0)
+		LogicalMaximum_i8(1)
 		UsagePage_Digitizers
 		Usage_Dig_TabletFunctionKeys
 		CollectionPhysical(
···
 			Input(Var|Abs)
 			// Byte 4 in report is the wheel
 			Usage_GD_Wheel
-			LogicalRange_i8(-1, 1)
+			LogicalMinimum_i8(-1)
+			LogicalMaximum_i8(1)
 			ReportCount(1)
 			ReportSize(8)
 			Input(Var|Rel)
 			// Byte 5 is the button state
 			UsagePage_Button
-			UsageRange_i8(0x01, 0x6)
-			LogicalRange_i8(0x01, 0x6)
+			UsageMinimum_i8(0x1)
+			UsageMaximum_i8(0x6)
+			LogicalMinimum_i8(0x1)
+			LogicalMaximum_i8(0x6)
 			ReportCount(1)
 			ReportSize(8)
 			Input(Arr|Abs)
···
 			Usage_Dig_TipSwitch
 			Usage_Dig_BarrelSwitch
 			Usage_Dig_SecondaryBarrelSwitch // maps eraser to BTN_STYLUS2
-			LogicalRange_i8(0, 1)
+			LogicalMinimum_i8(0)
+			LogicalMaximum_i8(1)
 			ReportSize(1)
 			ReportCount(3)
 			Input(Var|Abs)
···
 				UsagePage_GenericDesktop
 				Unit(cm)
 				UnitExponent(-1)
-				PhysicalRange_i16(0, 160)
-				LogicalRange_i16(0, 32767)
+				PhysicalMinimum_i16(0)
+				PhysicalMaximum_i16(160)
+				LogicalMinimum_i16(0)
+				LogicalMaximum_i16(32767)
 				Usage_GD_X
 				Input(Var|Abs) // Bytes 2+3
-				PhysicalRange_i16(0, 100)
-				LogicalRange_i16(0, 32767)
+				PhysicalMinimum_i16(0)
+				PhysicalMaximum_i16(100)
+				LogicalMinimum_i16(0)
+				LogicalMaximum_i16(32767)
 				Usage_GD_Y
 				Input(Var|Abs) // Bytes 4+5
 			)
 			UsagePage_Digitizers
 			Usage_Dig_TipPressure
-			LogicalRange_i16(0, 8191)
+			LogicalMinimum_i16(0)
+			LogicalMaximum_i16(8191)
 			Input(Var|Abs) // Byte 6+7
 			// Two bytes padding so we don't need to change the report at all
 			ReportSize(8)
···
 		Usage_Dig_Pen
 		CollectionPhysical(
 			// Byte 1 are the buttons
-			LogicalRange_i8(0, 1)
+			LogicalMinimum_i8(0)
+			LogicalMaximum_i8(1)
 			ReportSize(1)
 			Usage_Dig_TipSwitch
 			Usage_Dig_BarrelSwitch
···
 				UnitExponent(-1)
 				// Note: reported logical range differs
 				// from the pen report ID for x and y
-				LogicalRange_i16(0, 32000)
-				PhysicalRange_i16(0, 160)
+				LogicalMinimum_i16(0)
+				LogicalMaximum_i16(32000)
+				PhysicalMinimum_i16(0)
+				PhysicalMaximum_i16(160)
 				// Bytes 2/3 in report
 				Usage_GD_X
 				Input(Var|Abs)
-				LogicalRange_i16(0, 20000)
-				PhysicalRange_i16(0, 100)
+				LogicalMinimum_i16(0)
+				LogicalMaximum_i16(20000)
+				PhysicalMinimum_i16(0)
+				PhysicalMaximum_i16(100)
 				// Bytes 4/5 in report
 				Usage_GD_Y
 				Input(Var|Abs)
 			)
 			// Bytes 6/7 in report
-			LogicalRange_i16(0, 8192)
+			LogicalMinimum_i16(0)
+			LogicalMaximum_i16(8192)
 			Usage_Dig_TipPressure
 			Input(Var|Abs)
 		)
···
 	CollectionApplication(
 		// Byte 0
 		ReportId(PAD_REPORT_ID)
-		LogicalRange_i8(0, 1)
+		LogicalMinimum_i8(0)
+		LogicalMaximum_i8(1)
 		UsagePage_Digitizers
 		Usage_Dig_TabletFunctionKeys
 		CollectionPhysical(
···
 			Input(Var|Abs)
 			// Byte 4 is the button state
 			UsagePage_Button
-			UsageRange_i8(0x01, 0x6)
-			LogicalRange_i8(0x0, 0x1)
+			UsageMinimum_i8(0x1)
+			UsageMaximum_i8(0x6)
+			LogicalMinimum_i8(0x0)
+			LogicalMaximum_i8(0x1)
 			ReportCount(6)
 			ReportSize(1)
 			Input(Var|Abs)
···
 			// Byte 5 is the wheel
 			UsagePage_GenericDesktop
 			Usage_GD_Wheel
-			LogicalRange_i8(-1, 1)
+			LogicalMinimum_i8(-1)
+			LogicalMaximum_i8(1)
 			ReportCount(1)
 			ReportSize(8)
 			Input(Var|Rel)

drivers/hid/bpf/progs/Mistel__MD770.bpf.c

···
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024 Tatsuyuki Ishi
+ */
+
+#include "vmlinux.h"
+#include "hid_bpf.h"
+#include "hid_bpf_helpers.h"
+#include <bpf/bpf_tracing.h>
+
+#define VID_HOLTEK	0x04D9
+#define PID_MD770	0x0339
+#define RDESC_SIZE	203
+
+HID_BPF_CONFIG(
+	HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_HOLTEK, PID_MD770)
+);
+
+/*
+ * The Mistel MD770 keyboard reports the first 6 simultaneous key presses
+ * through the first interface, and anything beyond that through a second
+ * interface. Unfortunately, the second interface's report descriptor has an
+ * error, causing events to be malformed and ignored. This HID-BPF driver
+ * fixes the descriptor to allow NKRO to work again.
+ *
+ * For reference, this is the original report descriptor:
+ *
+ * 0x05, 0x01,        // Usage Page (Generic Desktop)        0
+ * 0x09, 0x80,        // Usage (System Control)              2
+ * 0xa1, 0x01,        // Collection (Application)            4
+ * 0x85, 0x01,        //  Report ID (1)                      6
+ * 0x19, 0x81,        //  Usage Minimum (129)                8
+ * 0x29, 0x83,        //  Usage Maximum (131)                10
+ * 0x15, 0x00,        //  Logical Minimum (0)                12
+ * 0x25, 0x01,        //  Logical Maximum (1)                14
+ * 0x95, 0x03,        //  Report Count (3)                   16
+ * 0x75, 0x01,        //  Report Size (1)                    18
+ * 0x81, 0x02,        //  Input (Data,Var,Abs)               20
+ * 0x95, 0x01,        //  Report Count (1)                   22
+ * 0x75, 0x05,        //  Report Size (5)                    24
+ * 0x81, 0x01,        //  Input (Cnst,Arr,Abs)               26
+ * 0xc0,              // End Collection                      28
+ * 0x05, 0x0c,        // Usage Page (Consumer Devices)       29
+ * 0x09, 0x01,        // Usage (Consumer Control)            31
+ * 0xa1, 0x01,        // Collection (Application)            33
+ * 0x85, 0x02,        //  Report ID (2)                      35
+ * 0x15, 0x00,        //  Logical Minimum (0)                37
+ * 0x25, 0x01,        //  Logical Maximum (1)                39
+ * 0x95, 0x12,        //  Report Count (18)                  41
+ * 0x75, 0x01,        //  Report Size (1)                    43
+ * 0x0a, 0x83, 0x01,  //  Usage (AL Consumer Control Config) 45
+ * 0x0a, 0x8a, 0x01,  //  Usage (AL Email Reader)            48
+ * 0x0a, 0x92, 0x01,  //  Usage (AL Calculator)              51
+ * 0x0a, 0x94, 0x01,  //  Usage (AL Local Machine Browser)   54
+ * 0x09, 0xcd,        //  Usage (Play/Pause)                 57
+ * 0x09, 0xb7,        //  Usage (Stop)                       59
+ * 0x09, 0xb6,        //  Usage (Scan Previous Track)        61
+ * 0x09, 0xb5,        //  Usage (Scan Next Track)            63
+ * 0x09, 0xe2,        //  Usage (Mute)                       65
+ * 0x09, 0xea,        //  Usage (Volume Down)                67
+ * 0x09, 0xe9,        //  Usage (Volume Up)                  69
+ * 0x0a, 0x21, 0x02,  //  Usage (AC Search)                  71
+ * 0x0a, 0x23, 0x02,  //  Usage (AC Home)                    74
+ * 0x0a, 0x24, 0x02,  //  Usage (AC Back)                    77
+ * 0x0a, 0x25, 0x02,  //  Usage (AC Forward)                 80
+ * 0x0a, 0x26, 0x02,  //  Usage (AC Stop)                    83
+ * 0x0a, 0x27, 0x02,  //  Usage (AC Refresh)                 86
+ * 0x0a, 0x2a, 0x02,  //  Usage (AC Bookmarks)               89
+ * 0x81, 0x02,        //  Input (Data,Var,Abs)               92
+ * 0x95, 0x01,        //  Report Count (1)                   94
+ * 0x75, 0x0e,        //  Report Size (14)                   96
+ * 0x81, 0x01,        //  Input (Cnst,Arr,Abs)               98
+ * 0xc0,              // End Collection                      100
+ * 0x05, 0x01,        // Usage Page (Generic Desktop)        101
+ * 0x09, 0x02,        // Usage (Mouse)                       103
+ * 0xa1, 0x01,        // Collection (Application)            105
+ * 0x09, 0x01,        //  Usage (Pointer)                    107
+ * 0xa1, 0x00,        //  Collection (Physical)              109
+ * 0x85, 0x03,        //   Report ID (3)                     111
+ * 0x05, 0x09,        //   Usage Page (Button)               113
+ * 0x19, 0x01,        //   Usage Minimum (1)                 115
+ * 0x29, 0x08,        //   Usage Maximum (8)                 117
+ * 0x15, 0x00,        //   Logical Minimum (0)               119
+ * 0x25, 0x01,        //   Logical Maximum (1)               121
+ * 0x75, 0x01,        //   Report Size (1)                   123
+ * 0x95, 0x08,        //   Report Count (8)                  125
+ * 0x81, 0x02,        //   Input (Data,Var,Abs)              127
+ * 0x05, 0x01,        //   Usage Page (Generic Desktop)      129
+ * 0x09, 0x30,        //   Usage (X)                         131
+ * 0x09, 0x31,        //   Usage (Y)                         133
+ * 0x16, 0x01, 0x80,  //   Logical Minimum (-32767)          135
+ * 0x26, 0xff, 0x7f,  //   Logical Maximum (32767)           138
+ * 0x75, 0x10,        //   Report Size (16)                  141
+ * 0x95, 0x02,        //   Report Count (2)                  143
+ * 0x81, 0x06,        //   Input (Data,Var,Rel)              145
+ * 0x09, 0x38,        //   Usage (Wheel)                     147
+ * 0x15, 0x81,        //   Logical Minimum (-127)            149
+ * 0x25, 0x7f,        //   Logical Maximum (127)             151
+ * 0x75, 0x08,        //   Report Size (8)                   153
+ * 0x95, 0x01,        //   Report Count (1)                  155
+ * 0x81, 0x06,        //   Input (Data,Var,Rel)              157
+ * 0x05, 0x0c,        //   Usage Page (Consumer Devices)     159
+ * 0x0a, 0x38, 0x02,  //   Usage (AC Pan)                    161
+ * 0x95, 0x01,        //   Report Count (1)                  164
+ * 0x81, 0x06,        //   Input (Data,Var,Rel)              166
+ * 0xc0,              //  End Collection                     168
+ * 0xc0,              // End Collection                      169
+ * 0x05, 0x01,        // Usage Page (Generic Desktop)        170
+ * 0x09, 0x06,        // Usage (Keyboard)                    172
+ * 0xa1, 0x01,        // Collection (Application)            174
+ * 0x85, 0x04,        //  Report ID (4)                      176
+ * 0x05, 0x07,        //  Usage Page (Keyboard)              178
+ * 0x95, 0x01,        //  Report Count (1)                   180
+ * 0x75, 0x08,        //  Report Size (8)                    182
+ * 0x81, 0x03,        //  Input (Cnst,Var,Abs)               184
+ * 0x95, 0xe8,        //  Report Count (232)                 186
+ * 0x75, 0x01,        //  Report Size (1)                    188
+ * 0x15, 0x00,        //  Logical Minimum (0)                190
+ * 0x25, 0x01,        //  Logical Maximum (1)                192
+ * 0x05, 0x07,        //  Usage Page (Keyboard)              194
+ * 0x19, 0x00,        //  Usage Minimum (0)                  196
+ * 0x29, 0xe7,        //  Usage Maximum (231)                198
+ * 0x81, 0x00,        //  Input (Data,Arr,Abs)               200  <- change to 0x81, 0x02 (Data,Var,Abs)
+ * 0xc0,              // End Collection                      202
+ */
+
+SEC(HID_BPF_RDESC_FIXUP)
+int BPF_PROG(hid_rdesc_fixup_mistel_md770, struct hid_bpf_ctx *hctx)
+{
+	__u8 *data = hid_bpf_get_data(hctx, 0, HID_MAX_DESCRIPTOR_SIZE);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	if (data[201] == 0x00)
+		data[201] = 0x02;
+
+	return 0;
+}
+
+HID_BPF_OPS(mistel_md770) = {
+	.hid_rdesc_fixup = (void *)hid_rdesc_fixup_mistel_md770,
+};
+
+SEC("syscall")
+int probe(struct hid_bpf_probe_args *ctx)
+{
+	ctx->retval = ctx->rdesc_size != RDESC_SIZE;
+	if (ctx->retval)
+		ctx->retval = -EINVAL;
+
+	return 0;
+}
+
+char _license[] SEC("license") = "GPL";

drivers/hid/bpf/progs/Rapoo__M50-Plus-Silent.bpf.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2024 José Expósito
+ */
+
+#include "vmlinux.h"
+#include "hid_bpf.h"
+#include "hid_bpf_helpers.h"
+#include <bpf/bpf_tracing.h>
+
+#define VID_RAPOO	0x24AE
+#define PID_M50		0x2015
+#define RDESC_SIZE	186
+
+HID_BPF_CONFIG(
+	HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, VID_RAPOO, PID_M50)
+);
+
+/*
+ * The Rapoo M50 Plus Silent mouse has 2 side buttons in addition to the left,
+ * right and middle buttons. However, its original HID descriptor has a Usage
+ * Maximum of 3, preventing the side buttons to work. This HID-BPF driver
+ * changes that usage to 5.
+ *
+ * For reference, this is the original report descriptor:
+ *
+ * 0x05, 0x01,       // Usage Page (Generic Desktop)        0
+ * 0x09, 0x02,       // Usage (Mouse)                       2
+ * 0xa1, 0x01,       // Collection (Application)            4
+ * 0x85, 0x01,       //  Report ID (1)                      6
+ * 0x09, 0x01,       //  Usage (Pointer)                    8
+ * 0xa1, 0x00,       //  Collection (Physical)              10
+ * 0x05, 0x09,       //   Usage Page (Button)               12
+ * 0x19, 0x01,       //   Usage Minimum (1)                 14
+ * 0x29, 0x03,       //   Usage Maximum (3)                 16 <- change to 0x05
+ * 0x15, 0x00,       //   Logical Minimum (0)               18
+ * 0x25, 0x01,       //   Logical Maximum (1)               20
+ * 0x75, 0x01,       //   Report Size (1)                   22
+ * 0x95, 0x05,       //   Report Count (5)                  24
+ * 0x81, 0x02,       //   Input (Data,Var,Abs)              26
+ * 0x75, 0x03,       //   Report Size (3)                   28
+ * 0x95, 0x01,       //   Report Count (1)                  30
+ * 0x81, 0x01,       //   Input (Cnst,Arr,Abs)              32
+ * 0x05, 0x01,       //   Usage Page (Generic Desktop)      34
+ * 0x09, 0x30,       //   Usage (X)                         36
+ * 0x09, 0x31,       //   Usage (Y)                         38
+ * 0x16, 0x01, 0x80, //   Logical Minimum (-32767)          40
+ * 0x26, 0xff, 0x7f, //   Logical Maximum (32767)           43
+ * 0x75, 0x10,       //   Report Size (16)                  46
+ * 0x95, 0x02,       //   Report Count (2)                  48
+ * 0x81, 0x06,       //   Input (Data,Var,Rel)              50
+ * 0x09, 0x38,       //   Usage (Wheel)                     52
+ * 0x15, 0x81,       //   Logical Minimum (-127)            54
+ * 0x25, 0x7f,       //   Logical Maximum (127)             56
+ * 0x75, 0x08,       //   Report Size (8)                   58
+ * 0x95, 0x01,       //   Report Count (1)                  60
+ * 0x81, 0x06,       //   Input (Data,Var,Rel)              62
+ * 0xc0,             //  End Collection                     64
+ * 0xc0,             // End Collection                      65
+ * 0x05, 0x0c,       // Usage Page (Consumer Devices)       66
+ * 0x09, 0x01,       // Usage (Consumer Control)            68
+ * 0xa1, 0x01,       // Collection (Application)            70
+ * 0x85, 0x02,       //  Report ID (2)                      72
+ * 0x75, 0x10,       //  Report Size (16)                   74
+ * 0x95, 0x01,       //  Report Count (1)                   76
+ * 0x15, 0x01,       //  Logical Minimum (1)                78
+ * 0x26, 0x8c, 0x02, //  Logical Maximum (652)              80
+ * 0x19, 0x01,       //  Usage Minimum (1)                  83
+ * 0x2a, 0x8c, 0x02, //  Usage Maximum (652)                85
+ * 0x81, 0x00,       //  Input (Data,Arr,Abs)               88
+ * 0xc0,             // End Collection                      90
+ * 0x05, 0x01,       // Usage Page (Generic Desktop)        91
+ * 0x09, 0x80,       // Usage (System Control)              93
+ * 0xa1, 0x01,       // Collection (Application)            95
+ * 0x85, 0x03,       //  Report ID (3)                      97
+ * 0x09, 0x82,       //  Usage (System Sleep)               99
+ * 0x09, 0x81,       //  Usage (System Power Down)          101
+ * 0x09, 0x83,       //  Usage (System Wake Up)             103
+ * 0x15, 0x00,       //  Logical Minimum (0)                105
+ * 0x25, 0x01,       //  Logical Maximum (1)                107
+ * 0x19, 0x01,       //  Usage Minimum (1)                  109
+ * 0x29, 0x03,       //  Usage Maximum (3)                  111
+ * 0x75, 0x01,       //  Report Size (1)                    113
+ * 0x95, 0x03,       //  Report Count (3)                   115
+ * 0x81, 0x02,       //  Input (Data,Var,Abs)               117
+ * 0x95, 0x05,       //  Report Count (5)                   119
+ * 0x81, 0x01,       //  Input (Cnst,Arr,Abs)               121
+ * 0xc0,             // End Collection                      123
+ * 0x05, 0x01,       // Usage Page (Generic Desktop)        124
+ * 0x09, 0x00,       // Usage (Undefined)                   126
+ * 0xa1, 0x01,       // Collection (Application)            128
+ * 0x85, 0x05,       //  Report ID (5)                      130
+ * 0x06, 0x00, 0xff, //  Usage Page (Vendor Defined Page 1) 132
+ * 0x09, 0x01,       //  Usage (Vendor Usage 1)             135
+ * 0x15, 0x81,       //  Logical Minimum (-127)             137
+ * 0x25, 0x7f,       //  Logical Maximum (127)              139
+ * 0x75, 0x08,       //  Report Size (8)                    141
+ * 0x95, 0x07,       //  Report Count (7)                   143
+ * 0xb1, 0x02,       //  Feature (Data,Var,Abs)             145
+ * 0xc0,             // End Collection                      147
+ * 0x06, 0x00, 0xff, // Usage Page (Vendor Defined Page 1)  148
+ * 0x09, 0x0e,       // Usage (Vendor Usage 0x0e)           151
+ * 0xa1, 0x01,       // Collection (Application)            153
+ * 0x85, 0xba,       //  Report ID (186)                    155
+ * 0x95, 0x1f,       //  Report Count (31)                  157
+ * 0x75, 0x08,       //  Report Size (8)                    159
+ * 0x26, 0xff, 0x00, //  Logical Maximum (255)              161
+ * 0x15, 0x00,       //  Logical Minimum (0)                164
+ * 0x09, 0x01,       //  Usage (Vendor Usage 1)             166
+ * 0x91, 0x02,       //  Output (Data,Var,Abs)              168
+ * 0x85, 0xba,       //  Report ID (186)                    170
+ * 0x95, 0x1f,       //  Report Count (31)                  172
+ * 0x75, 0x08,       //  Report Size (8)                    174
+ * 0x26, 0xff, 0x00, //  Logical Maximum (255)              176
+ * 0x15, 0x00,       //  Logical Minimum (0)                179
+ * 0x09, 0x01,       //  Usage (Vendor Usage 1)             181
+ * 0x81, 0x02,       //  Input (Data,Var,Abs)               183
+ * 0xc0,             // End Collection                      185
+ */
+
+SEC(HID_BPF_RDESC_FIXUP)
+int BPF_PROG(hid_rdesc_fixup_rapoo_m50, struct hid_bpf_ctx *hctx)
+{
+	__u8 *data = hid_bpf_get_data(hctx, 0, HID_MAX_DESCRIPTOR_SIZE);
+
+	if (!data)
+		return 0; /* EPERM check */
+
+	if (data[17] == 0x03)
+		data[17] = 0x05;
+
+	return 0;
+}
+
+HID_BPF_OPS(rapoo_m50) = {
+	.hid_rdesc_fixup = (void *)hid_rdesc_fixup_rapoo_m50,
+};
+
+SEC("syscall")
+int probe(struct hid_bpf_probe_args *ctx)
+{
+	ctx->retval = ctx->rdesc_size != RDESC_SIZE;
+	if (ctx->retval)
+		ctx->retval = -EINVAL;
+
+	return 0;
+}
+
+char _license[] SEC("license") = "GPL";

drivers/hid/bpf/progs/hid_report_helpers.h

···
  *     Usage_GD_Keyboard
  *     CollectionApplication(     ← Open the collection
  *         ReportId(3)
- *         LogicalRange_i8(0, 1)
+ *         LogicalMinimum_i8(0)
+ *         LogicalMaximum_i8(1)
  *         // other fields
  *     )                          ← End EndCollection
  *
···
 #define Arr		0x0
 #define Abs		0x0
 #define Rel		0x4
+#define Null		0x40
+#define Buff		0x0100
 
 /* Use like this: Input(Var|Abs) */
 #define Input(i_)			0x081, i8(i_),
 #define Output(i_)			0x091, i8(i_),
 #define Feature(i_)			0x0b1, i8(i_),
 
+#define Input_i16(i_)			0x082, LE16(i_),
+#define Output_i16(i_)			0x092, LE16(i_),
+#define Feature_i16(i_)			0x0b2, LE16(i_),
+
 #define ReportId(id_)			0x85, i8(id_),
 #define ReportSize(sz_)		        0x75, i8(sz_),
 #define ReportCount(cnt_)		0x95, i8(cnt_),
 
-#define LogicalRange_i8(min_, max_)	0x15, i8(min_), 0x25, i8(max_),
-#define LogicalRange_i16(min_, max_)	0x16, LE16(min_), 0x26, LE16(max_),
-#define LogicalRange_i32(min_, max_)	0x17, LE32(min_), 0x27, LE32(max_),
+#define LogicalMinimum_i8(min_)		0x15, i8(min_),
+#define LogicalMinimum_i16(min_)	0x16, LE16(min_),
+#define LogicalMinimum_i32(min_)	0x17, LE32(min_),
 
-#define PhysicalRange_i8(min_, max_)	0x35, i8(min_), 0x45, i8(max_),
-#define PhysicalRange_i16(min_, max_)	0x36, LE16(min_), 0x46, LE16(max_),
-#define PhysicalRange_i32(min_, max_)	0x37, LE32(min_), 0x47, LE32(max_),
+#define LogicalMaximum_i8(max_)		0x25, i8(max_),
+#define LogicalMaximum_i16(max_)	0x26, LE16(max_),
+#define LogicalMaximum_i32(max_)	0x27, LE32(max_),
 
-#define UsageRange_i8(min_, max_)	0x19, i8(min_), 0x29, i8(max_),
-#define UsageRange_i16(min_, max_)	0x1a, LE16(min_), 0x2a, LE16(max_),
+#define PhysicalMinimum_i8(min_)	0x35, i8(min_),
+#define PhysicalMinimum_i16(min_)	0x36, LE16(min_),
+#define PhysicalMinimum_i32(min_)	0x37, LE32(min_),
+
+#define PhysicalMaximum_i8(max_)	0x45, i8(max_),
+#define PhysicalMaximum_i16(max_)	0x46, LE16(max_),
+#define PhysicalMaximum_i32(max_)	0x47, LE32(max_),
+
+#define UsageMinimum_i8(min_)		0x19, i8(min_),
+#define UsageMinimum_i16(min_)		0x1a, LE16(min_),
+
+#define UsageMaximum_i8(max_)		0x29, i8(max_),
+#define UsageMaximum_i16(max_)		0x2a, LE16(max_),
 
 #define UsagePage_i8(p_)		0x05, i8(p_),
 #define UsagePage_i16(p_)		0x06, LE16(p_),

drivers/hid/hid-asus.c

···
 
 	if (drvdata->quirks & QUIRK_G752_KEYBOARD &&
 		 *rsize == 75 && rdesc[61] == 0x15 && rdesc[62] == 0x00) {
-		/* report is missing usage mninum and maximum */
+		/* report is missing usage minimum and maximum */
 		__u8 *new_rdesc;
 		size_t new_size = *rsize + sizeof(asus_g752_fixed_rdesc);
 

drivers/hid/hid-core.c

···
 MODULE_PARM_DESC(ignore_special_drivers, "Ignore any special drivers and handle all devices by generic driver");
 
 /*
+ * Convert a signed n-bit integer to signed 32-bit integer.
+ */
+
+static s32 snto32(__u32 value, unsigned int n)
+{
+	if (!value || !n)
+		return 0;
+
+	if (n > 32)
+		n = 32;
+
+	return sign_extend32(value, n - 1);
+}
+
+/*
+ * Convert a signed 32-bit integer to a signed n-bit integer.
+ */
+
+static u32 s32ton(__s32 value, unsigned int n)
+{
+	s32 a = value >> (n - 1);
+
+	if (a && a != -1)
+		return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1;
+	return value & ((1 << n) - 1);
+}
+
+/*
  * Register a new report for a device.
  */
 
···
 		 * both this and the standard encoding. */
 		raw_value = item_sdata(item);
 		if (!(raw_value & 0xfffffff0))
-			parser->global.unit_exponent = hid_snto32(raw_value, 4);
+			parser->global.unit_exponent = snto32(raw_value, 4);
 		else
 			parser->global.unit_exponent = raw_value;
 		return 0;
···
 		INIT_LIST_HEAD(&report_enum->report_list);
 	}
 
-	kfree(device->rdesc);
+	/*
+	 * If the HID driver had a rdesc_fixup() callback, dev->rdesc
+	 * will be allocated by hid-core and needs to be freed.
+	 * Otherwise, it is either equal to dev_rdesc or bpf_rdesc, in
+	 * which cases it'll be freed later on device removal or destroy.
+	 */
+	if (device->rdesc != device->dev_rdesc && device->rdesc != device->bpf_rdesc)
+		kfree(device->rdesc);
 	device->rdesc = NULL;
 	device->rsize = 0;
 
···
 	device->status &= ~HID_STAT_PARSED;
 }
 
+static inline void hid_free_bpf_rdesc(struct hid_device *hdev)
+{
+	/* bpf_rdesc is either equal to dev_rdesc or allocated by call_hid_bpf_rdesc_fixup() */
+	if (hdev->bpf_rdesc != hdev->dev_rdesc)
+		kfree(hdev->bpf_rdesc);
+	hdev->bpf_rdesc = NULL;
+}
+
 /*
  * Free a device structure, all reports, and all fields.
  */
···
 	struct hid_device *hid = container_of(ref, struct hid_device, ref);
 
 	hid_close_report(hid);
+	hid_free_bpf_rdesc(hid);
 	kfree(hid->dev_rdesc);
 	kfree(hid);
 }
···
 	}
 
 	item->format = HID_ITEM_FORMAT_SHORT;
-	item->size = b & 3;
+	item->size = BIT(b & 3) >> 1; /* 0, 1, 2, 3 -> 0, 1, 2, 4 */
+
+	if (end - start < item->size)
+		return NULL;
 
 	switch (item->size) {
 	case 0:
-		return start;
+		break;
 
 	case 1:
-		if ((end - start) < 1)
-			return NULL;
-		item->data.u8 = *start++;
-		return start;
+		item->data.u8 = *start;
+		break;
 
 	case 2:
-		if ((end - start) < 2)
-			return NULL;
 		item->data.u16 = get_unaligned_le16(start);
-		start = (__u8 *)((__le16 *)start + 1);
-		return start;
+		break;
 
-	case 3:
-		item->size++;
-		if ((end - start) < 4)
-			return NULL;
+	case 4:
 		item->data.u32 = get_unaligned_le32(start);
-		start = (__u8 *)((__le32 *)start + 1);
-		return start;
+		break;
 	}
 
-	return NULL;
+	return start + item->size;
 }
 
 static void hid_scan_input_usage(struct hid_parser *parser, u32 usage)
···
 	struct hid_item item;
 	unsigned int size;
 	const __u8 *start;
-	__u8 *buf;
 	const __u8 *end;
 	const __u8 *next;
 	int ret;
···
 	if (WARN_ON(device->status & HID_STAT_PARSED))
 		return -EBUSY;
 
-	start = device->dev_rdesc;
+	start = device->bpf_rdesc;
 	if (WARN_ON(!start))
 		return -ENODEV;
-	size = device->dev_rsize;
+	size = device->bpf_rsize;
 
-	/* call_hid_bpf_rdesc_fixup() ensures we work on a copy of rdesc */
-	buf = call_hid_bpf_rdesc_fixup(device, start, &size);
-	if (buf == NULL)
-		return -ENOMEM;
+	if (device->driver->report_fixup) {
+		/*
+		 * device->driver->report_fixup() needs to work
+		 * on a copy of our report descriptor so it can
+		 * change it.
+		 */
+		__u8 *buf = kmemdup(start, size, GFP_KERNEL);
 
-	if (device->driver->report_fixup)
+		if (buf == NULL)
+			return -ENOMEM;
+
 		start = device->driver->report_fixup(device, buf, &size);
-	else
-		start = buf;
 
-	start = kmemdup(start, size, GFP_KERNEL);
-	kfree(buf);
-	if (start == NULL)
-		return -ENOMEM;
+		/*
+		 * The second kmemdup is required in case report_fixup() returns
+		 * a static read-only memory, but we have no idea if that memory
+		 * needs to be cleaned up or not at the end.
+		 */
+		start = kmemdup(start, size, GFP_KERNEL);
+		kfree(buf);
+		if (start == NULL)
+			return -ENOMEM;
+	}
 
 	device->rdesc = start;
 	device->rsize = size;
···
 	return ret;
 }
 EXPORT_SYMBOL_GPL(hid_open_report);
-
-/*
- * Convert a signed n-bit integer to signed 32-bit integer. Common
- * cases are done through the compiler, the screwed things has to be
- * done by hand.
- */
-
-static s32 snto32(__u32 value, unsigned n)
-{
-	if (!value || !n)
-		return 0;
-
-	if (n > 32)
-		n = 32;
-
-	switch (n) {
-	case 8:  return ((__s8)value);
-	case 16: return ((__s16)value);
-	case 32: return ((__s32)value);
-	}
-	return value & (1 << (n - 1)) ? value | (~0U << n) : value;
-}
-
-s32 hid_snto32(__u32 value, unsigned n)
-{
-	return snto32(value, n);
-}
-EXPORT_SYMBOL_GPL(hid_snto32);
-
-/*
- * Convert a signed 32-bit integer to a signed n-bit integer.
- */
-
-static u32 s32ton(__s32 value, unsigned n)
-{
-	s32 a = value >> (n - 1);
-	if (a && a != -1)
-		return value < 0 ? 1 << (n - 1) : (1 << (n - 1)) - 1;
-	return value & ((1 << n) - 1);
-}
 
 /*
  * Extract/implement a data field from/to a little endian report (bit array).
···
 	/*
 	 * hid-generic implements .match(), so we must be dealing with a
 	 * different HID driver here, and can simply check if
-	 * hid_ignore_special_drivers is set or not.
+	 * hid_ignore_special_drivers or HID_QUIRK_IGNORE_SPECIAL_DRIVER
+	 * are set or not.
 	 */
-	return !hid_ignore_special_drivers;
+	return !hid_ignore_special_drivers && !(hdev->quirks & HID_QUIRK_IGNORE_SPECIAL_DRIVER);
 }
 
 static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
 {
 	const struct hid_device_id *id;
 	int ret;
+
+	if (!hdev->bpf_rsize) {
+		unsigned int quirks;
+
+		/* reset the quirks that has been previously set */
+		quirks = hid_lookup_quirk(hdev);
+		hdev->quirks = quirks;
+
+		/* in case a bpf program gets detached, we need to free the old one */
+		hid_free_bpf_rdesc(hdev);
+
+		/* keep this around so we know we called it once */
+		hdev->bpf_rsize = hdev->dev_rsize;
+
+		/* call_hid_bpf_rdesc_fixup will always return a valid pointer */
+		hdev->bpf_rdesc = call_hid_bpf_rdesc_fixup(hdev, hdev->dev_rdesc,
+							   &hdev->bpf_rsize);
+		if (quirks ^ hdev->quirks)
+			hid_info(hdev, "HID-BPF toggled quirks on the device: %04x",
+				 quirks ^ hdev->quirks);
+	}
 
 	if (!hid_check_device_match(hdev, hdrv, &id))
 		return -ENODEV;
···
 	if (!hdev->devres_group_id)
 		return -ENOMEM;
 
-	/* reset the quirks that has been previously set */
-	hdev->quirks = hid_lookup_quirk(hdev);
 	hdev->driver = hdrv;
 
 	if (hdrv->probe) {
···
 		hid_debug_unregister(hdev);
 		hdev->status &= ~HID_STAT_ADDED;
 	}
+	hid_free_bpf_rdesc(hdev);
 	kfree(hdev->dev_rdesc);
 	hdev->dev_rdesc = NULL;
 	hdev->dev_rsize = 0;
+	hdev->bpf_rsize = 0;
 }
 
 /**

drivers/hid/hid-corsair-void.c

···
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  HID driver for Corsair Void headsets
+ *
+ *  Copyright (C) 2023-2024 Stuart Hayhurst
+ */
+
+/* -------------------------------------------------------------------------- */
+/* Receiver report information: (ID 100)                                      */
+/* -------------------------------------------------------------------------- */
+/*
+ * When queried, the receiver reponds with 5 bytes to describe the battery
+ *   The power button, mute button and moving the mic also trigger this report
+ * This includes power button + mic + connection + battery status and capacity
+ * The information below may not be perfect, it's been gathered through guesses
+ *
+ * 0: REPORT ID
+ *  100 for the battery packet
+ *
+ * 1: POWER BUTTON + (?)
+ *  Largest bit is 1 when power button pressed
+ *
+ * 2: BATTERY CAPACITY + MIC STATUS
+ *  Battery capacity:
+ *    Seems to report ~54 higher than reality when charging
+ *    Capped at 100, charging or not
+ *  Microphone status:
+ *    Largest bit is set to 1 when the mic is physically up
+ *    No bits change when the mic is muted, only when physically moved
+ *    This report is sent every time the mic is moved, no polling required
+ *
+ * 3: CONNECTION STATUS
+ *  16: Wired headset
+ *  38: Initialising
+ *  49: Lost connection
+ *  51: Disconnected, searching
+ *  52: Disconnected, not searching
+ *  177: Normal
+ *
+ * 4: BATTERY STATUS
+ *  0: Disconnected
+ *  1: Normal
+ *  2: Low
+ *  3: Critical - sent during shutdown
+ *  4: Fully charged
+ *  5: Charging
+ */
+/* -------------------------------------------------------------------------- */
+
+/* -------------------------------------------------------------------------- */
+/* Receiver report information: (ID 102)                                      */
+/* -------------------------------------------------------------------------- */
+/*
+ * When queried, the recevier responds with 4 bytes to describe the firmware
+ * The first 2 bytes are for the receiver, the second 2 are the headset
+ * The headset firmware version will be 0 if no headset is connected
+ *
+ * 0: Recevier firmware major version
+ *  Major version of the receiver's firmware
+ *
+ * 1: Recevier firmware minor version
+ *  Minor version of the receiver's firmware
+ *
+ * 2: Headset firmware major version
+ *  Major version of the headset's firmware
+ *
+ * 3: Headset firmware minor version
+ *  Minor version of the headset's firmware
+ */
+/* -------------------------------------------------------------------------- */
+
+#include <linux/bitfield.h>
+#include <linux/bitops.h>
+#include <linux/cleanup.h>
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/power_supply.h>
+#include <linux/usb.h>
+#include <linux/workqueue.h>
+#include <asm/byteorder.h>
+
+#include "hid-ids.h"
+
+#define CORSAIR_VOID_DEVICE(id, type)		{ HID_USB_DEVICE(USB_VENDOR_ID_CORSAIR, (id)), \
+						.driver_data = (type) }
+#define CORSAIR_VOID_WIRELESS_DEVICE(id)	CORSAIR_VOID_DEVICE((id), CORSAIR_VOID_WIRELESS)
+#define CORSAIR_VOID_WIRED_DEVICE(id)		CORSAIR_VOID_DEVICE((id), CORSAIR_VOID_WIRED)
+
+#define CORSAIR_VOID_STATUS_REQUEST_ID		0xC9
+#define CORSAIR_VOID_NOTIF_REQUEST_ID		0xCA
+#define CORSAIR_VOID_SIDETONE_REQUEST_ID	0xFF
+#define CORSAIR_VOID_STATUS_REPORT_ID		0x64
+#define CORSAIR_VOID_FIRMWARE_REPORT_ID		0x66
+
+#define CORSAIR_VOID_USB_SIDETONE_REQUEST	0x1
+#define CORSAIR_VOID_USB_SIDETONE_REQUEST_TYPE	0x21
+#define CORSAIR_VOID_USB_SIDETONE_VALUE		0x200
+#define CORSAIR_VOID_USB_SIDETONE_INDEX		0xB00
+
+#define CORSAIR_VOID_MIC_MASK			GENMASK(7, 7)
+#define CORSAIR_VOID_CAPACITY_MASK		GENMASK(6, 0)
+
+#define CORSAIR_VOID_WIRELESS_CONNECTED		177
+
+#define CORSAIR_VOID_SIDETONE_MAX_WIRELESS	55
+#define CORSAIR_VOID_SIDETONE_MAX_WIRED		4096
+
+enum {
+	CORSAIR_VOID_WIRELESS,
+	CORSAIR_VOID_WIRED,
+};
+
+enum {
+	CORSAIR_VOID_BATTERY_NORMAL	= 1,
+	CORSAIR_VOID_BATTERY_LOW	= 2,
+	CORSAIR_VOID_BATTERY_CRITICAL	= 3,
+	CORSAIR_VOID_BATTERY_CHARGED	= 4,
+	CORSAIR_VOID_BATTERY_CHARGING	= 5,
+};
+
+static enum power_supply_property corsair_void_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_SCOPE,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+struct corsair_void_battery_data {
+	int status;
+	bool present;
+	int capacity;
+	int capacity_level;
+};
+
+struct corsair_void_drvdata {
+	struct hid_device *hid_dev;
+	struct device *dev;
+
+	char *name;
+	bool is_wired;
+	unsigned int sidetone_max;
+
+	struct corsair_void_battery_data battery_data;
+	bool mic_up;
+	bool connected;
+	int fw_receiver_major;
+	int fw_receiver_minor;
+	int fw_headset_major;
+	int fw_headset_minor;
+
+	struct power_supply *battery;
+	struct power_supply_desc battery_desc;
+	struct mutex battery_mutex;
+
+	struct delayed_work delayed_status_work;
+	struct delayed_work delayed_firmware_work;
+	struct work_struct battery_remove_work;
+	struct work_struct battery_add_work;
+};
+
+/*
+ * Functions to process receiver data
+*/
+
+static void corsair_void_set_wireless_status(struct corsair_void_drvdata *drvdata)
+{
+	struct usb_interface *usb_if = to_usb_interface(drvdata->dev->parent);
+
+	if (drvdata->is_wired)
+		return;
+
+	usb_set_wireless_status(usb_if, drvdata->connected ?
+					USB_WIRELESS_STATUS_CONNECTED :
+					USB_WIRELESS_STATUS_DISCONNECTED);
+}
+
+static void corsair_void_set_unknown_batt(struct corsair_void_drvdata *drvdata)
+{
+	struct corsair_void_battery_data *battery_data = &drvdata->battery_data;
+
+	battery_data->status = POWER_SUPPLY_STATUS_UNKNOWN;
+	battery_data->present = false;
+	battery_data->capacity = 0;
+	battery_data->capacity_level = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
+}
+
+/* Reset data that may change between wireless connections */
+static void corsair_void_set_unknown_wireless_data(struct corsair_void_drvdata *drvdata)
+{
+	/* Only 0 out headset, receiver is always known if relevant */
+	drvdata->fw_headset_major = 0;
+	drvdata->fw_headset_minor = 0;
+
+	drvdata->connected = false;
+	drvdata->mic_up = false;
+
+	corsair_void_set_wireless_status(drvdata);
+}
+
+static void corsair_void_process_receiver(struct corsair_void_drvdata *drvdata,
+					  int raw_battery_capacity,
+					  int raw_connection_status,
+					  int raw_battery_status)
+{
+	struct corsair_void_battery_data *battery_data = &drvdata->battery_data;
+	struct corsair_void_battery_data orig_battery_data;
+
+	/* Save initial battery data, to compare later */
+	orig_battery_data = *battery_data;
+
+	/* Headset not connected, or it's wired */
+	if (raw_connection_status != CORSAIR_VOID_WIRELESS_CONNECTED)
+		goto unknown_battery;
+
+	/* Battery information unavailable */
+	if (raw_battery_status == 0)
+		goto unknown_battery;
+
+	/* Battery must be connected then */
+	battery_data->present = true;
+	battery_data->capacity_level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+
+	/* Set battery status */
+	switch (raw_battery_status) {
+	case CORSAIR_VOID_BATTERY_NORMAL:
+	case CORSAIR_VOID_BATTERY_LOW:
+	case CORSAIR_VOID_BATTERY_CRITICAL:
+		battery_data->status = POWER_SUPPLY_STATUS_DISCHARGING;
+		if (raw_battery_status == CORSAIR_VOID_BATTERY_LOW)
+			battery_data->capacity_level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+		else if (raw_battery_status == CORSAIR_VOID_BATTERY_CRITICAL)
+			battery_data->capacity_level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+
+		break;
+	case CORSAIR_VOID_BATTERY_CHARGED:
+		battery_data->status = POWER_SUPPLY_STATUS_FULL;
+		break;
+	case CORSAIR_VOID_BATTERY_CHARGING:
+		battery_data->status = POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	default:
+		hid_warn(drvdata->hid_dev, "unknown battery status '%d'",
+			 raw_battery_status);
+		goto unknown_battery;
+		break;
+	}
+
+	battery_data->capacity = raw_battery_capacity;
+	corsair_void_set_wireless_status(drvdata);
+
+	goto success;
+unknown_battery:
+	corsair_void_set_unknown_batt(drvdata);
+success:
+
+	/* Inform power supply if battery values changed */
+	if (memcmp(&orig_battery_data, battery_data, sizeof(*battery_data))) {
+		scoped_guard(mutex, &drvdata->battery_mutex) {
+			if (drvdata->battery) {
+				power_supply_changed(drvdata->battery);
+			}
+		}
+	}
+}
+
+/*
+ * Functions to report stored data
+*/
+
+static int corsair_void_battery_get_property(struct power_supply *psy,
+					     enum power_supply_property prop,
+					     union power_supply_propval *val)
+{
+	struct corsair_void_drvdata *drvdata = power_supply_get_drvdata(psy);
+
+	switch (prop) {
+		case POWER_SUPPLY_PROP_SCOPE:
+			val->intval = POWER_SUPPLY_SCOPE_DEVICE;
+			break;
+		case POWER_SUPPLY_PROP_MODEL_NAME:
+			if (!strncmp(drvdata->hid_dev->name, "Corsair ", 8))
+				val->strval = drvdata->hid_dev->name + 8;
+			else
+				val->strval = drvdata->hid_dev->name;
+			break;
+		case POWER_SUPPLY_PROP_MANUFACTURER:
+			val->strval = "Corsair";
+			break;
+		case POWER_SUPPLY_PROP_STATUS:
+			val->intval = drvdata->battery_data.status;
+			break;
+		case POWER_SUPPLY_PROP_PRESENT:
+			val->intval = drvdata->battery_data.present;
+			break;
+		case POWER_SUPPLY_PROP_CAPACITY:
+			val->intval = drvdata->battery_data.capacity;
+			break;
+		case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+			val->intval = drvdata->battery_data.capacity_level;
+			break;
+		default:
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
+static ssize_t microphone_up_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (!drvdata->connected)
+		return -ENODEV;
+
+	return sysfs_emit(buf, "%d\n", drvdata->mic_up);
+}
+
+static ssize_t fw_version_receiver_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (drvdata->fw_receiver_major == 0 && drvdata->fw_receiver_minor == 0)
+		return -ENODATA;
+
+	return sysfs_emit(buf, "%d.%02d\n", drvdata->fw_receiver_major,
+			  drvdata->fw_receiver_minor);
+}
+
+
+static ssize_t fw_version_headset_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
+
+	if (drvdata->fw_headset_major == 0 && drvdata->fw_headset_minor == 0)
+		return -ENODATA;
+
+	return sysfs_emit(buf, "%d.%02d\n", drvdata->fw_headset_major,
+			  drvdata->fw_headset_minor);
+}
+
+static ssize_t sidetone_max_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
+
+	return sysfs_emit(buf, "%d\n", drvdata->sidetone_max);
+}
+
+/*
+ * Functions to send data to headset
+*/
+
+static ssize_t send_alert_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
+	struct hid_device *hid_dev = drvdata->hid_dev;
+	unsigned char alert_id;
+	unsigned char *send_buf __free(kfree) = NULL;
+	int ret;
+
+	if (!drvdata->connected || drvdata->is_wired)
+		return -ENODEV;
+
+	/* Only accept 0 or 1 for alert ID */
+	if (kstrtou8(buf, 10, &alert_id) || alert_id >= 2)
+		return -EINVAL;
+
+	send_buf = kmalloc(3, GFP_KERNEL);
+	if (!send_buf)
+		return -ENOMEM;
+
+	/* Packet format to send alert with ID alert_id */
+	send_buf[0] = CORSAIR_VOID_NOTIF_REQUEST_ID;
+	send_buf[1] = 0x02;
+	send_buf[2] = alert_id;
+
+	ret = hid_hw_raw_request(hid_dev, CORSAIR_VOID_NOTIF_REQUEST_ID,
+				 send_buf, 3, HID_OUTPUT_REPORT,
+				 HID_REQ_SET_REPORT);
+	if (ret < 0)
+		hid_warn(hid_dev, "failed to send alert request (reason: %d)",
+			 ret);
+	else
+		ret = count;
+
+	return ret;
+}
+
+static int corsair_void_set_sidetone_wired(struct device *dev, const char *buf,
+					   unsigned int sidetone)
+{
+	struct usb_interface *usb_if = to_usb_interface(dev->parent);
+	struct usb_device *usb_dev = interface_to_usbdev(usb_if);
+
+	/* Packet format to set sidetone for wired headsets */
+	__le16 sidetone_le = cpu_to_le16(sidetone);
+
+	return usb_control_msg_send(usb_dev, 0,
+				   CORSAIR_VOID_USB_SIDETONE_REQUEST,
+				   CORSAIR_VOID_USB_SIDETONE_REQUEST_TYPE,
+				   CORSAIR_VOID_USB_SIDETONE_VALUE,
+				   CORSAIR_VOID_USB_SIDETONE_INDEX,
+				   &sidetone_le, 2, USB_CTRL_SET_TIMEOUT,
+				   GFP_KERNEL);
+}
+
+static int corsair_void_set_sidetone_wireless(struct device *dev,
+					      const char *buf,
+					      unsigned char sidetone)
+{
+	struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
+	struct hid_device *hid_dev = drvdata->hid_dev;
+	unsigned char *send_buf __free(kfree) = NULL;
+
+	send_buf = kmalloc(12, GFP_KERNEL);
+	if (!send_buf)
+		return -ENOMEM;
+
+	/* Packet format to set sidetone for wireless headsets */
+	send_buf[0] = CORSAIR_VOID_SIDETONE_REQUEST_ID;
+	send_buf[1] = 0x0B;
+	send_buf[2] = 0x00;
+	send_buf[3] = 0xFF;
+	send_buf[4] = 0x04;
+	send_buf[5] = 0x0E;
+	send_buf[6] = 0xFF;
+	send_buf[7] = 0x05;
+	send_buf[8] = 0x01;
+	send_buf[9] = 0x04;
+	send_buf[10] = 0x00;
+	send_buf[11] = sidetone + 200;
+
+	return hid_hw_raw_request(hid_dev, CORSAIR_VOID_SIDETONE_REQUEST_ID,
+				  send_buf, 12, HID_FEATURE_REPORT,
+				  HID_REQ_SET_REPORT);
+}
+
+static ssize_t set_sidetone_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct corsair_void_drvdata *drvdata = dev_get_drvdata(dev);
+	struct hid_device *hid_dev = drvdata->hid_dev;
+	unsigned int sidetone;
+	int ret;
+
+	if (!drvdata->connected)
+		return -ENODEV;
+
+	/* sidetone must be between 0 and drvdata->sidetone_max inclusive */
+	if (kstrtouint(buf, 10, &sidetone) || sidetone > drvdata->sidetone_max)
+		return -EINVAL;
+
+	if (drvdata->is_wired)
+		ret = corsair_void_set_sidetone_wired(dev, buf, sidetone);
+	else
+		ret = corsair_void_set_sidetone_wireless(dev, buf, sidetone);
+
+	if (ret < 0)
+		hid_warn(hid_dev, "failed to send sidetone (reason: %d)", ret);
+	else
+		ret = count;
+
+	return ret;
+}
+
+static int corsair_void_request_status(struct hid_device *hid_dev, int id)
+{
+	unsigned char *send_buf __free(kfree) = NULL;
+
+	send_buf = kmalloc(2, GFP_KERNEL);
+	if (!send_buf)
+		return -ENOMEM;
+
+	/* Packet format to request data item (status / firmware) refresh */
+	send_buf[0] = CORSAIR_VOID_STATUS_REQUEST_ID;
+	send_buf[1] = id;
+
+	/* Send request for data refresh */
+	return hid_hw_raw_request(hid_dev, CORSAIR_VOID_STATUS_REQUEST_ID,
+				  send_buf, 2, HID_OUTPUT_REPORT,
+				  HID_REQ_SET_REPORT);
+}
+
+/*
+ * Headset connect / disconnect handlers and work handlers
+*/
+
+static void corsair_void_status_work_handler(struct work_struct *work)
+{
+	struct corsair_void_drvdata *drvdata;
+	struct delayed_work *delayed_work;
+	int battery_ret;
+
+	delayed_work = container_of(work, struct delayed_work, work);
+	drvdata = container_of(delayed_work, struct corsair_void_drvdata,
+			       delayed_status_work);
+
+	battery_ret = corsair_void_request_status(drvdata->hid_dev,
+						  CORSAIR_VOID_STATUS_REPORT_ID);
+	if (battery_ret < 0) {
+		hid_warn(drvdata->hid_dev,
+			 "failed to request battery (reason: %d)", battery_ret);
+	}
+}
+
+static void corsair_void_firmware_work_handler(struct work_struct *work)
+{
+	struct corsair_void_drvdata *drvdata;
+	struct delayed_work *delayed_work;
+	int firmware_ret;
+
+	delayed_work = container_of(work, struct delayed_work, work);
+	drvdata = container_of(delayed_work, struct corsair_void_drvdata,
+			       delayed_firmware_work);
+
+	firmware_ret = corsair_void_request_status(drvdata->hid_dev,
+						   CORSAIR_VOID_FIRMWARE_REPORT_ID);
+	if (firmware_ret < 0) {
+		hid_warn(drvdata->hid_dev,
+			 "failed to request firmware (reason: %d)", firmware_ret);
+	}
+
+}
+
+static void corsair_void_battery_remove_work_handler(struct work_struct *work)
+{
+	struct corsair_void_drvdata *drvdata;
+
+	drvdata = container_of(work, struct corsair_void_drvdata,
+			       battery_remove_work);
+	scoped_guard(mutex, &drvdata->battery_mutex) {
+		if (drvdata->battery) {
+			power_supply_unregister(drvdata->battery);
+			drvdata->battery = NULL;
+		}
+	}
+}
+
+static void corsair_void_battery_add_work_handler(struct work_struct *work)
+{
+	struct corsair_void_drvdata *drvdata;
+	struct power_supply_config psy_cfg;
+	struct power_supply *new_supply;
+
+	drvdata = container_of(work, struct corsair_void_drvdata,
+			       battery_add_work);
+	guard(mutex)(&drvdata->battery_mutex);
+	if (drvdata->battery)
+		return;
+
+	psy_cfg.drv_data = drvdata;
+	new_supply = power_supply_register(drvdata->dev,
+					   &drvdata->battery_desc,
+					   &psy_cfg);
+
+	if (IS_ERR(new_supply)) {
+		hid_err(drvdata->hid_dev,
+			"failed to register battery '%s' (reason: %ld)\n",
+			drvdata->battery_desc.name,
+			PTR_ERR(new_supply));
+		return;
+	}
+
+	if (power_supply_powers(new_supply, drvdata->dev)) {
+		power_supply_unregister(new_supply);
+		return;
+	}
+
+	drvdata->battery = new_supply;
+}
+
+static void corsair_void_headset_connected(struct corsair_void_drvdata *drvdata)
+{
+	schedule_work(&drvdata->battery_add_work);
+	schedule_delayed_work(&drvdata->delayed_firmware_work,
+			      msecs_to_jiffies(100));
+}
+
+static void corsair_void_headset_disconnected(struct corsair_void_drvdata *drvdata)
+{
+	schedule_work(&drvdata->battery_remove_work);
+
+	corsair_void_set_unknown_wireless_data(drvdata);
+	corsair_void_set_unknown_batt(drvdata);
+}
+
+/*
+ * Driver setup, probing and HID event handling
+*/
+
+static DEVICE_ATTR_RO(fw_version_receiver);
+static DEVICE_ATTR_RO(fw_version_headset);
+static DEVICE_ATTR_RO(microphone_up);
+static DEVICE_ATTR_RO(sidetone_max);
+
+static DEVICE_ATTR_WO(send_alert);
+static DEVICE_ATTR_WO(set_sidetone);
+
+static struct attribute *corsair_void_attrs[] = {
+	&dev_attr_fw_version_receiver.attr,
+	&dev_attr_fw_version_headset.attr,
+	&dev_attr_microphone_up.attr,
+	&dev_attr_send_alert.attr,
+	&dev_attr_set_sidetone.attr,
+	&dev_attr_sidetone_max.attr,
+	NULL,
+};
+
+static const struct attribute_group corsair_void_attr_group = {
+	.attrs = corsair_void_attrs,
+};
+
+static int corsair_void_probe(struct hid_device *hid_dev,
+			      const struct hid_device_id *hid_id)
+{
+	int ret;
+	struct corsair_void_drvdata *drvdata;
+	char *name;
+
+	if (!hid_is_usb(hid_dev))
+		return -EINVAL;
+
+	drvdata = devm_kzalloc(&hid_dev->dev, sizeof(*drvdata),
+			       GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	hid_set_drvdata(hid_dev, drvdata);
+	dev_set_drvdata(&hid_dev->dev, drvdata);
+
+	drvdata->dev = &hid_dev->dev;
+	drvdata->hid_dev = hid_dev;
+	drvdata->is_wired = hid_id->driver_data == CORSAIR_VOID_WIRED;
+
+	drvdata->sidetone_max = CORSAIR_VOID_SIDETONE_MAX_WIRELESS;
+	if (drvdata->is_wired)
+		drvdata->sidetone_max = CORSAIR_VOID_SIDETONE_MAX_WIRED;
+
+	/* Set initial values for no wireless headset attached */
+	/* If a headset is attached, it'll be prompted later */
+	corsair_void_set_unknown_wireless_data(drvdata);
+	corsair_void_set_unknown_batt(drvdata);
+
+	/* Receiver version won't be reset after init */
+	/* Headset version already set via set_unknown_wireless_data */
+	drvdata->fw_receiver_major = 0;
+	drvdata->fw_receiver_minor = 0;
+
+	ret = hid_parse(hid_dev);
+	if (ret) {
+		hid_err(hid_dev, "parse failed (reason: %d)\n", ret);
+		return ret;
+	}
+
+	name = devm_kasprintf(drvdata->dev, GFP_KERNEL,
+			      "corsair-void-%d-battery", hid_dev->id);
+	if (!name)
+		return -ENOMEM;
+
+	drvdata->battery_desc.name = name;
+	drvdata->battery_desc.type = POWER_SUPPLY_TYPE_BATTERY;
+	drvdata->battery_desc.properties = corsair_void_battery_props;
+	drvdata->battery_desc.num_properties = ARRAY_SIZE(corsair_void_battery_props);
+	drvdata->battery_desc.get_property = corsair_void_battery_get_property;
+
+	drvdata->battery = NULL;
+	INIT_WORK(&drvdata->battery_remove_work,
+		  corsair_void_battery_remove_work_handler);
+	INIT_WORK(&drvdata->battery_add_work,
+		  corsair_void_battery_add_work_handler);
+	ret = devm_mutex_init(drvdata->dev, &drvdata->battery_mutex);
+	if (ret)
+		return ret;
+
+	ret = sysfs_create_group(&hid_dev->dev.kobj, &corsair_void_attr_group);
+	if (ret)
+		return ret;
+
+	/* Any failures after here will need to call hid_hw_stop */
+	ret = hid_hw_start(hid_dev, HID_CONNECT_DEFAULT);
+	if (ret) {
+		hid_err(hid_dev, "hid_hw_start failed (reason: %d)\n", ret);
+		goto failed_after_sysfs;
+	}
+
+	/* Refresh battery data, in case wireless headset is already connected */
+	INIT_DELAYED_WORK(&drvdata->delayed_status_work,
+			  corsair_void_status_work_handler);
+	schedule_delayed_work(&drvdata->delayed_status_work,
+			      msecs_to_jiffies(100));
+
+	/* Refresh firmware versions */
+	INIT_DELAYED_WORK(&drvdata->delayed_firmware_work,
+			  corsair_void_firmware_work_handler);
+	schedule_delayed_work(&drvdata->delayed_firmware_work,
+			      msecs_to_jiffies(100));
+
+	return 0;
+
+failed_after_sysfs:
+	sysfs_remove_group(&hid_dev->dev.kobj, &corsair_void_attr_group);
+	return ret;
+}
+
+static void corsair_void_remove(struct hid_device *hid_dev)
+{
+	struct corsair_void_drvdata *drvdata = hid_get_drvdata(hid_dev);
+
+	hid_hw_stop(hid_dev);
+	cancel_work_sync(&drvdata->battery_remove_work);
+	cancel_work_sync(&drvdata->battery_add_work);
+	if (drvdata->battery)
+		power_supply_unregister(drvdata->battery);
+
+	cancel_delayed_work_sync(&drvdata->delayed_firmware_work);
+	sysfs_remove_group(&hid_dev->dev.kobj, &corsair_void_attr_group);
+}
+
+static int corsair_void_raw_event(struct hid_device *hid_dev,
+				  struct hid_report *hid_report,
+				  u8 *data, int size)
+{
+	struct corsair_void_drvdata *drvdata = hid_get_drvdata(hid_dev);
+	bool was_connected = drvdata->connected;
+
+	/* Description of packets are documented at the top of this file */
+	if (hid_report->id == CORSAIR_VOID_STATUS_REPORT_ID) {
+		drvdata->mic_up = FIELD_GET(CORSAIR_VOID_MIC_MASK, data[2]);
+		drvdata->connected = (data[3] == CORSAIR_VOID_WIRELESS_CONNECTED) ||
+				     drvdata->is_wired;
+
+		corsair_void_process_receiver(drvdata,
+					      FIELD_GET(CORSAIR_VOID_CAPACITY_MASK, data[2]),
+					      data[3], data[4]);
+	} else if (hid_report->id == CORSAIR_VOID_FIRMWARE_REPORT_ID) {
+		drvdata->fw_receiver_major = data[1];
+		drvdata->fw_receiver_minor = data[2];
+		drvdata->fw_headset_major = data[3];
+		drvdata->fw_headset_minor = data[4];
+	}
+
+	/* Handle wireless headset connect / disconnect */
+	if ((was_connected != drvdata->connected) && !drvdata->is_wired) {
+		if (drvdata->connected)
+			corsair_void_headset_connected(drvdata);
+		else
+			corsair_void_headset_disconnected(drvdata);
+	}
+
+	return 0;
+}
+
+static const struct hid_device_id corsair_void_devices[] = {
+	/* Corsair Void Wireless */
+	CORSAIR_VOID_WIRELESS_DEVICE(0x0a0c),
+	CORSAIR_VOID_WIRELESS_DEVICE(0x0a2b),
+	CORSAIR_VOID_WIRELESS_DEVICE(0x1b23),
+	CORSAIR_VOID_WIRELESS_DEVICE(0x1b25),
+	CORSAIR_VOID_WIRELESS_DEVICE(0x1b27),
+
+	/* Corsair Void USB */
+	CORSAIR_VOID_WIRED_DEVICE(0x0a0f),
+	CORSAIR_VOID_WIRED_DEVICE(0x1b1c),
+	CORSAIR_VOID_WIRED_DEVICE(0x1b29),
+	CORSAIR_VOID_WIRED_DEVICE(0x1b2a),
+
+	/* Corsair Void Surround */
+	CORSAIR_VOID_WIRED_DEVICE(0x0a30),
+	CORSAIR_VOID_WIRED_DEVICE(0x0a31),
+
+	/* Corsair Void Pro Wireless */
+	CORSAIR_VOID_WIRELESS_DEVICE(0x0a14),
+	CORSAIR_VOID_WIRELESS_DEVICE(0x0a16),
+	CORSAIR_VOID_WIRELESS_DEVICE(0x0a1a),
+
+	/* Corsair Void Pro USB */
+	CORSAIR_VOID_WIRED_DEVICE(0x0a17),
+	CORSAIR_VOID_WIRED_DEVICE(0x0a1d),
+
+	/* Corsair Void Pro Surround */
+	CORSAIR_VOID_WIRED_DEVICE(0x0a18),
+	CORSAIR_VOID_WIRED_DEVICE(0x0a1e),
+	CORSAIR_VOID_WIRED_DEVICE(0x0a1f),
+
+	/* Corsair Void Elite Wireless */
+	CORSAIR_VOID_WIRELESS_DEVICE(0x0a51),
+	CORSAIR_VOID_WIRELESS_DEVICE(0x0a55),
+	CORSAIR_VOID_WIRELESS_DEVICE(0x0a75),
+
+	/* Corsair Void Elite USB */
+	CORSAIR_VOID_WIRED_DEVICE(0x0a52),
+	CORSAIR_VOID_WIRED_DEVICE(0x0a56),
+
+	/* Corsair Void Elite Surround */
+	CORSAIR_VOID_WIRED_DEVICE(0x0a53),
+	CORSAIR_VOID_WIRED_DEVICE(0x0a57),
+
+	{}
+};
+
+MODULE_DEVICE_TABLE(hid, corsair_void_devices);
+
+static struct hid_driver corsair_void_driver = {
+	.name = "hid-corsair-void",
+	.id_table = corsair_void_devices,
+	.probe = corsair_void_probe,
+	.remove = corsair_void_remove,
+	.raw_event = corsair_void_raw_event,
+};
+
+module_hid_driver(corsair_void_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Stuart Hayhurst <[e-mail]>");
+MODULE_DESCRIPTION("HID driver for Corsair Void headsets");

drivers/hid/hid-cp2112.c

···
 {
 	int ret;
 
-	BUG_ON(cfg->report != CP2112_USB_CONFIG);
+	if (WARN_ON(cfg->report != CP2112_USB_CONFIG))
+		return -EINVAL;
 
 	ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),
 				HID_FEATURE_REPORT);

drivers/hid/hid-debug.c

···
 	[KEY_EPG] = "EPG",			[KEY_PVR] = "PVR",
 	[KEY_MHP] = "MHP",			[KEY_LANGUAGE] = "Language",
 	[KEY_TITLE] = "Title",			[KEY_SUBTITLE] = "Subtitle",
-	[KEY_ANGLE] = "Angle",			[KEY_ZOOM] = "Zoom",
+	[KEY_ANGLE] = "Angle",
 	[KEY_MODE] = "Mode",			[KEY_KEYBOARD] = "Keyboard",
-	[KEY_SCREEN] = "Screen",		[KEY_PC] = "PC",
+	[KEY_PC] = "PC",
 	[KEY_TV] = "TV",			[KEY_TV2] = "TV2",
 	[KEY_VCR] = "VCR",			[KEY_VCR2] = "VCR2",
 	[KEY_SAT] = "Sat",			[KEY_SAT2] = "Sat2",
···
 	[BTN_TRIGGER_HAPPY35] = "TriggerHappy35", [BTN_TRIGGER_HAPPY36] = "TriggerHappy36",
 	[BTN_TRIGGER_HAPPY37] = "TriggerHappy37", [BTN_TRIGGER_HAPPY38] = "TriggerHappy38",
 	[BTN_TRIGGER_HAPPY39] = "TriggerHappy39", [BTN_TRIGGER_HAPPY40] = "TriggerHappy40",
-	[BTN_DIGI] = "Digi",			[BTN_STYLUS3] = "Stylus3",
-	[BTN_TOOL_QUINTTAP] = "ToolQuintTap",	[BTN_WHEEL] = "Wheel",
+	[BTN_STYLUS3] = "Stylus3",		 [BTN_TOOL_QUINTTAP] = "ToolQuintTap",
 	[KEY_10CHANNELSDOWN] = "10ChannelsDown",
 	[KEY_10CHANNELSUP] = "10ChannelsUp",
 	[KEY_3D_MODE] = "3DMode",		[KEY_ADDRESSBOOK] = "Addressbook",
···
 	[KEY_FN_RIGHT_SHIFT] = "FnRightShift",	[KEY_FRAMEBACK] = "FrameBack",
 	[KEY_FRAMEFORWARD] = "FrameForward",	[KEY_FULL_SCREEN] = "FullScreen",
 	[KEY_GAMES] = "Games",			[KEY_GRAPHICSEDITOR] = "GraphicsEditor",
-	[KEY_HANGEUL] = "HanGeul",		[KEY_HANGUP_PHONE] = "HangUpPhone",
+	[KEY_HANGUP_PHONE] = "HangUpPhone",
 	[KEY_IMAGES] = "Images",		[KEY_KBD_LCD_MENU1] = "KbdLcdMenu1",
 	[KEY_KBD_LCD_MENU2] = "KbdLcdMenu2",	[KEY_KBD_LCD_MENU3] = "KbdLcdMenu3",
 	[KEY_KBD_LCD_MENU4] = "KbdLcdMenu4",	[KEY_KBD_LCD_MENU5] = "KbdLcdMenu5",

drivers/hid/hid-generic.c

···
 	if (ignore_special_driver)
 		return true;
 
+	if (hdev->quirks & HID_QUIRK_IGNORE_SPECIAL_DRIVER)
+		return true;
+
 	if (hdev->quirks & HID_QUIRK_HAVE_SPECIAL_DRIVER)
 		return false;
 

drivers/hid/hid-goodix-spi.c

···
 #define GOODIX_HID_DESC_ADDR		0x1058C
 #define GOODIX_HID_REPORT_DESC_ADDR	0x105AA
 #define GOODIX_HID_SIGN_ADDR		0x10D32
+#define GOODIX_HID_CMD_ADDR		0x10364
+#define GOODIX_HID_REPORT_ADDR		0x22C8C
 
 #define GOODIX_HID_GET_REPORT_CMD	0x02
 #define GOODIX_HID_SET_REPORT_CMD	0x03
···
 		 * - byte 0:    Ack flag, value of 1 for data ready
 		 * - bytes 1-2: Response data length
 		 */
-		error = goodix_spi_read(ts, ts->hid_report_addr,
+		error = goodix_spi_read(ts, GOODIX_HID_CMD_ADDR,
 					&hdr, sizeof(hdr));
 		if (!error && (hdr.flag & GOODIX_HID_ACK_READY_FLAG)) {
 			len = le16_to_cpu(hdr.size);
···
 				dev_err(ts->dev, "hrd.size too short: %d", len);
 				return -EINVAL;
 			}
-			*resp_len = len;
+			*resp_len = len - GOODIX_HID_PKG_LEN_SIZE;
 			return 0;
 		}
 
···
 	tx_len += args_len;
 
 	/* Step1: write report request info */
-	error = goodix_spi_write(ts, ts->hid_report_addr, tmp_buf, tx_len);
+	error = goodix_spi_write(ts, GOODIX_HID_CMD_ADDR, tmp_buf, tx_len);
 	if (error) {
 		dev_err(ts->dev, "failed send read feature cmd, %d", error);
 		return error;
···
 	if (error)
 		return error;
 
-	len = min(len, response_data_len - GOODIX_HID_PKG_LEN_SIZE);
+	/* Empty reprot response */
+	if (!response_data_len)
+		return 0;
+	len = min(len, response_data_len);
 	/* Step3: read response data(skip 2bytes of hid pkg length) */
-	error = goodix_spi_read(ts, ts->hid_report_addr +
+	error = goodix_spi_read(ts, GOODIX_HID_CMD_ADDR +
 				GOODIX_HID_ACK_HEADER_SIZE +
 				GOODIX_HID_PKG_LEN_SIZE, buf, len);
 	if (error) {
···
 	memcpy(tmp_buf + tx_len, buf, len);
 	tx_len += len;
 
-	error = goodix_spi_write(ts, ts->hid_report_addr, tmp_buf, tx_len);
+	error = goodix_spi_write(ts, GOODIX_HID_CMD_ADDR, tmp_buf, tx_len);
 	if (error) {
 		dev_err(ts->dev, "failed send report: %*ph", tx_len, tmp_buf);
 		return error;
···
 		return dev_err_probe(dev, PTR_ERR(ts->reset_gpio),
 				     "failed to request reset gpio\n");
 
-	error = device_property_read_u32(dev, "goodix,hid-report-addr",
-					 &ts->hid_report_addr);
-	if (error)
-		return dev_err_probe(dev, error,
-				     "failed get hid report addr\n");
-
+	ts->hid_report_addr = GOODIX_HID_REPORT_ADDR;
 	error = goodix_dev_confirm(ts);
 	if (error)
 		return error;
···
 	power_control_cmd[5] = power_state;
 
 	guard(mutex)(&ts->hid_request_lock);
-	error = goodix_spi_write(ts, ts->hid_report_addr, power_control_cmd,
+	error = goodix_spi_write(ts, GOODIX_HID_CMD_ADDR, power_control_cmd,
 				 sizeof(power_control_cmd));
 	if (error) {
 		dev_err(ts->dev, "failed set power mode: %s",
···
 MODULE_DEVICE_TABLE(acpi, goodix_spi_acpi_match);
 #endif
 
+#ifdef CONFIG_OF
+static const struct of_device_id goodix_spi_of_match[] = {
+	{ .compatible = "goodix,gt7986u-spifw", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, goodix_spi_of_match);
+#endif
+
 static const struct spi_device_id goodix_spi_ids[] = {
 	{ "gt7986u" },
 	{ },
···
 	.driver = {
 		.name = "goodix-spi-hid",
 		.acpi_match_table = ACPI_PTR(goodix_spi_acpi_match),
+		.of_match_table = of_match_ptr(goodix_spi_of_match),
 		.pm = pm_sleep_ptr(&goodix_spi_pm_ops),
 	},
 	.probe =	goodix_spi_probe,

drivers/hid/hid-hyperv.c

···
 	return 0;
 }
 
+static int mousevsc_hid_probe(struct hid_device *hid_dev, const struct hid_device_id *id)
+{
+	int ret;
+
+	ret = hid_parse(hid_dev);
+	if (ret) {
+		hid_err(hid_dev, "parse failed\n");
+		return ret;
+	}
+
+	ret = hid_hw_start(hid_dev, HID_CONNECT_HIDINPUT | HID_CONNECT_HIDDEV);
+	if (ret) {
+		hid_err(hid_dev, "hw start failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
 static const struct hid_ll_driver mousevsc_ll_driver = {
 	.parse = mousevsc_hid_parse,
 	.open = mousevsc_hid_open,
···
 	.raw_request = mousevsc_hid_raw_request,
 };
 
-static struct hid_driver mousevsc_hid_driver;
+static const struct hid_device_id mousevsc_devices[] = {
+	{ HID_DEVICE(BUS_VIRTUAL, HID_GROUP_ANY, 0x045E, 0x0621) },
+	{ }
+};
+
+static struct hid_driver mousevsc_hid_driver = {
+	.name = "hid-hyperv",
+	.id_table = mousevsc_devices,
+	.probe = mousevsc_hid_probe,
+};
 
 static int mousevsc_probe(struct hv_device *device,
 			const struct hv_vmbus_device_id *dev_id)
···
 	}
 
 	hid_dev->ll_driver = &mousevsc_ll_driver;
-	hid_dev->driver = &mousevsc_hid_driver;
 	hid_dev->bus = BUS_VIRTUAL;
 	hid_dev->vendor = input_dev->hid_dev_info.vendor;
 	hid_dev->product = input_dev->hid_dev_info.product;
···
 	ret = hid_add_device(hid_dev);
 	if (ret)
 		goto probe_err2;
-
-
-	ret = hid_parse(hid_dev);
-	if (ret) {
-		hid_err(hid_dev, "parse failed\n");
-		goto probe_err2;
-	}
-
-	ret = hid_hw_start(hid_dev, HID_CONNECT_HIDINPUT | HID_CONNECT_HIDDEV);
-
-	if (ret) {
-		hid_err(hid_dev, "hw start failed\n");
-		goto probe_err2;
-	}
 
 	device_init_wakeup(&device->device, true);
 
···
 
 static int __init mousevsc_init(void)
 {
-	return vmbus_driver_register(&mousevsc_drv);
+	int ret;
+
+	ret = hid_register_driver(&mousevsc_hid_driver);
+	if (ret)
+		return ret;
+
+	ret = vmbus_driver_register(&mousevsc_drv);
+	if (ret)
+		hid_unregister_driver(&mousevsc_hid_driver);
+
+	return ret;
 }
 
 static void __exit mousevsc_exit(void)
 {
 	vmbus_driver_unregister(&mousevsc_drv);
+	hid_unregister_driver(&mousevsc_hid_driver);
 }
 
 MODULE_LICENSE("GPL");

drivers/hid/hid-ids.h

···
 #define USB_DEVICE_ID_APPLE_MAGICMOUSE2	0x0269
 #define USB_DEVICE_ID_APPLE_MAGICTRACKPAD	0x030e
 #define USB_DEVICE_ID_APPLE_MAGICTRACKPAD2	0x0265
+#define USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC	0x0324
 #define USB_DEVICE_ID_APPLE_FOUNTAIN_ANSI	0x020e
 #define USB_DEVICE_ID_APPLE_FOUNTAIN_ISO	0x020f
 #define USB_DEVICE_ID_APPLE_GEYSER_ANSI	0x0214
···
 #define USB_DEVICE_ID_KYE_EASYPEN_M406XE	0x5019
 #define USB_DEVICE_ID_KYE_MOUSEPEN_I608X_V2	0x501A
 #define USB_DEVICE_ID_KYE_PENSKETCH_T609A	0x501B
+
+#define USB_VENDOR_ID_KYSONA		0x3554
+#define USB_DEVICE_ID_KYSONA_M600_DONGLE	0xF57C
+#define USB_DEVICE_ID_KYSONA_M600_WIRED	0xF57D
 
 #define USB_VENDOR_ID_LABTEC		0x1020
 #define USB_DEVICE_ID_LABTEC_WIRELESS_KEYBOARD	0x0006

drivers/hid/hid-kysona.c

···
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  USB HID driver for Kysona
+ *  Kysona M600 mice.
+ *
+ *  Copyright (c) 2024 Lode Willems <[e-mail]>
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/usb.h>
+
+#include "hid-ids.h"
+
+#define BATTERY_TIMEOUT_MS 5000
+
+#define BATTERY_REPORT_ID 4
+
+struct kysona_drvdata {
+	struct hid_device *hdev;
+	bool online;
+
+	struct power_supply_desc battery_desc;
+	struct power_supply *battery;
+	u8 battery_capacity;
+	bool battery_charging;
+	u16 battery_voltage;
+	struct delayed_work battery_work;
+};
+
+static enum power_supply_property kysona_battery_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_SCOPE,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_ONLINE
+};
+
+static int kysona_battery_get_property(struct power_supply *psy,
+				       enum power_supply_property psp,
+				       union power_supply_propval *val)
+{
+	struct kysona_drvdata *drv_data = power_supply_get_drvdata(psy);
+	int ret = 0;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = 1;
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = drv_data->online;
+		break;
+	case POWER_SUPPLY_PROP_STATUS:
+		if (drv_data->online)
+			val->intval = drv_data->battery_charging ?
+					POWER_SUPPLY_STATUS_CHARGING :
+					POWER_SUPPLY_STATUS_DISCHARGING;
+		else
+			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+		break;
+	case POWER_SUPPLY_PROP_SCOPE:
+		val->intval = POWER_SUPPLY_SCOPE_DEVICE;
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		val->intval = drv_data->battery_capacity;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		/* hardware reports voltage in mV. sysfs expects uV */
+		val->intval = drv_data->battery_voltage * 1000;
+		break;
+	case POWER_SUPPLY_PROP_MODEL_NAME:
+		val->strval = drv_data->hdev->name;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static const char kysona_battery_request[] = {
+	0x08, BATTERY_REPORT_ID, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x49
+};
+
+static int kysona_m600_fetch_battery(struct hid_device *hdev)
+{
+	u8 *write_buf;
+	int ret;
+
+	/* Request battery information */
+	write_buf = kmemdup(kysona_battery_request, sizeof(kysona_battery_request), GFP_KERNEL);
+	if (!write_buf)
+		return -ENOMEM;
+
+	ret = hid_hw_raw_request(hdev, kysona_battery_request[0],
+				 write_buf, sizeof(kysona_battery_request),
+				 HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
+	if (ret < (int)sizeof(kysona_battery_request)) {
+		hid_err(hdev, "hid_hw_raw_request() failed with %d\n", ret);
+		ret = -ENODATA;
+	}
+	kfree(write_buf);
+	return ret;
+}
+
+static void kysona_fetch_battery(struct hid_device *hdev)
+{
+	int ret = kysona_m600_fetch_battery(hdev);
+
+	if (ret < 0)
+		hid_dbg(hdev,
+			"Battery query failed (err: %d)\n", ret);
+}
+
+static void kysona_battery_timer_tick(struct work_struct *work)
+{
+	struct kysona_drvdata *drv_data = container_of(work,
+		struct kysona_drvdata, battery_work.work);
+	struct hid_device *hdev = drv_data->hdev;
+
+	kysona_fetch_battery(hdev);
+	schedule_delayed_work(&drv_data->battery_work,
+			      msecs_to_jiffies(BATTERY_TIMEOUT_MS));
+}
+
+static int kysona_battery_probe(struct hid_device *hdev)
+{
+	struct kysona_drvdata *drv_data = hid_get_drvdata(hdev);
+	struct power_supply_config pscfg = { .drv_data = drv_data };
+	int ret = 0;
+
+	drv_data->online = false;
+	drv_data->battery_capacity = 100;
+	drv_data->battery_voltage = 4200;
+
+	drv_data->battery_desc.properties = kysona_battery_props;
+	drv_data->battery_desc.num_properties = ARRAY_SIZE(kysona_battery_props);
+	drv_data->battery_desc.get_property = kysona_battery_get_property;
+	drv_data->battery_desc.type = POWER_SUPPLY_TYPE_BATTERY;
+	drv_data->battery_desc.use_for_apm = 0;
+	drv_data->battery_desc.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
+						     "kysona-%s-battery",
+						     strlen(hdev->uniq) ?
+						     hdev->uniq : dev_name(&hdev->dev));
+	if (!drv_data->battery_desc.name)
+		return -ENOMEM;
+
+	drv_data->battery = devm_power_supply_register(&hdev->dev,
+						       &drv_data->battery_desc, &pscfg);
+	if (IS_ERR(drv_data->battery)) {
+		ret = PTR_ERR(drv_data->battery);
+		drv_data->battery = NULL;
+		hid_err(hdev, "Unable to register battery device\n");
+		return ret;
+	}
+
+	power_supply_powers(drv_data->battery, &hdev->dev);
+
+	INIT_DELAYED_WORK(&drv_data->battery_work, kysona_battery_timer_tick);
+	kysona_fetch_battery(hdev);
+	schedule_delayed_work(&drv_data->battery_work,
+			      msecs_to_jiffies(BATTERY_TIMEOUT_MS));
+
+	return ret;
+}
+
+static int kysona_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	int ret;
+	struct kysona_drvdata *drv_data;
+	struct usb_interface *usbif;
+
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
+	usbif = to_usb_interface(hdev->dev.parent);
+
+	drv_data = devm_kzalloc(&hdev->dev, sizeof(*drv_data), GFP_KERNEL);
+	if (!drv_data)
+		return -ENOMEM;
+
+	hid_set_drvdata(hdev, drv_data);
+	drv_data->hdev = hdev;
+
+	ret = hid_parse(hdev);
+	if (ret)
+		return ret;
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret)
+		return ret;
+
+	if (usbif->cur_altsetting->desc.bInterfaceNumber == 1) {
+		if (kysona_battery_probe(hdev) < 0)
+			hid_err(hdev, "Kysona hid battery_probe failed: %d\n", ret);
+	}
+
+	return 0;
+}
+
+static int kysona_raw_event(struct hid_device *hdev,
+			    struct hid_report *report, u8 *data, int size)
+{
+	struct kysona_drvdata *drv_data = hid_get_drvdata(hdev);
+
+	if (drv_data->battery && size == sizeof(kysona_battery_request) &&
+	    data[0] == 8 && data[1] == BATTERY_REPORT_ID) {
+		drv_data->battery_capacity = data[6];
+		drv_data->battery_charging = data[7];
+		drv_data->battery_voltage = (data[8] << 8) | data[9];
+		drv_data->online = true;
+	}
+
+	return 0;
+}
+
+static void kysona_remove(struct hid_device *hdev)
+{
+	struct kysona_drvdata *drv_data = hid_get_drvdata(hdev);
+
+	if (drv_data->battery)
+		cancel_delayed_work_sync(&drv_data->battery_work);
+
+	hid_hw_stop(hdev);
+}
+
+static const struct hid_device_id kysona_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_KYSONA, USB_DEVICE_ID_KYSONA_M600_DONGLE) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_KYSONA, USB_DEVICE_ID_KYSONA_M600_WIRED) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, kysona_devices);
+
+static struct hid_driver kysona_driver = {
+	.name			= "kysona",
+	.id_table		= kysona_devices,
+	.probe			= kysona_probe,
+	.raw_event		= kysona_raw_event,
+	.remove			= kysona_remove
+};
+module_hid_driver(kysona_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("HID driver for Kysona devices");
+MODULE_AUTHOR("Lode Willems <[e-mail]>");

drivers/hid/hid-lg4ff.c

···
 
 	/* Initialize device properties */
 	if (mmode_ret == LG4FF_MMODE_IS_MULTIMODE) {
-		BUG_ON(mmode_idx == -1);
+		if (WARN_ON(mmode_idx == -1))
+			return -EINVAL;
 		mmode_wheel = &lg4ff_multimode_wheels[mmode_idx];
 	}
 	lg4ff_init_wheel_data(&entry->wdata, &lg4ff_devices[i], mmode_wheel, real_product_id);

drivers/hid/hid-logitech-hidpp.c

···
 #define CMD_ROOT_GET_PROTOCOL_VERSION			0x10
 
 static int hidpp_root_get_feature(struct hidpp_device *hidpp, u16 feature,
-	u8 *feature_index, u8 *feature_type)
+	u8 *feature_index)
 {
 	struct hidpp_report response;
 	int ret;
···
 		return -ENOENT;
 
 	*feature_index = response.fap.params[0];
-	*feature_type = response.fap.params[1];
 
 	return ret;
 }
···
 static int hidpp_get_serial(struct hidpp_device *hidpp, u32 *serial)
 {
 	struct hidpp_report response;
-	u8 feature_type;
 	u8 feature_index;
 	int ret;
 
 	ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_DEVICE_INFORMATION,
-				     &feature_index,
-				     &feature_type);
+				     &feature_index);
 	if (ret)
 		return ret;
 
···
 
 static char *hidpp_get_device_name(struct hidpp_device *hidpp)
 {
-	u8 feature_type;
 	u8 feature_index;
 	u8 __name_length;
 	char *name;
···
 	int ret;
 
 	ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_GET_DEVICE_NAME_TYPE,
-		&feature_index, &feature_type);
+		&feature_index);
 	if (ret)
 		return NULL;
 
···
 
 static int hidpp20_query_battery_info_1000(struct hidpp_device *hidpp)
 {
-	u8 feature_type;
 	int ret;
 	int status, capacity, next_capacity, level;
 
 	if (hidpp->battery.feature_index == 0xff) {
 		ret = hidpp_root_get_feature(hidpp,
 					     HIDPP_PAGE_BATTERY_LEVEL_STATUS,
-					     &hidpp->battery.feature_index,
-					     &feature_type);
+					     &hidpp->battery.feature_index);
 		if (ret)
 			return ret;
 	}
···
 
 static int hidpp20_query_battery_voltage_info(struct hidpp_device *hidpp)
 {
-	u8 feature_type;
 	int ret;
 	int status, voltage, level, charge_type;
 
 	if (hidpp->battery.voltage_feature_index == 0xff) {
 		ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_BATTERY_VOLTAGE,
-					     &hidpp->battery.voltage_feature_index,
-					     &feature_type);
+					     &hidpp->battery.voltage_feature_index);
 		if (ret)
 			return ret;
 	}
···
 
 static int hidpp20_query_battery_info_1004(struct hidpp_device *hidpp)
 {
-	u8 feature_type;
 	int ret;
 	u8 state_of_charge;
 	int status, level;
···
 	if (hidpp->battery.feature_index == 0xff) {
 		ret = hidpp_root_get_feature(hidpp,
 					     HIDPP_PAGE_UNIFIED_BATTERY,
-					     &hidpp->battery.feature_index,
-					     &feature_type);
+					     &hidpp->battery.feature_index);
 		if (ret)
 			return ret;
 	}
···
 
 static int hidpp_get_wireless_feature_index(struct hidpp_device *hidpp, u8 *feature_index)
 {
-	u8 feature_type;
-	int ret;
-
-	ret = hidpp_root_get_feature(hidpp,
-				     HIDPP_PAGE_WIRELESS_DEVICE_STATUS,
-				     feature_index, &feature_type);
-
-	return ret;
+	return hidpp_root_get_feature(hidpp,
+				      HIDPP_PAGE_WIRELESS_DEVICE_STATUS,
+				      feature_index);
 }
 
 /* -------------------------------------------------------------------------- */
···
 
 static int hidpp20_query_adc_measurement_info_1f20(struct hidpp_device *hidpp)
 {
-	u8 feature_type;
-
 	if (hidpp->battery.adc_measurement_feature_index == 0xff) {
 		int ret;
 
 		ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_ADC_MEASUREMENT,
-					     &hidpp->battery.adc_measurement_feature_index,
-					     &feature_type);
+					     &hidpp->battery.adc_measurement_feature_index);
 		if (ret)
 			return ret;
 
···
 	bool enabled, u8 *multiplier)
 {
 	u8 feature_index;
-	u8 feature_type;
 	int ret;
 	u8 params[1];
 	struct hidpp_report response;
 
 	ret = hidpp_root_get_feature(hidpp,
 				     HIDPP_PAGE_HI_RESOLUTION_SCROLLING,
-				     &feature_index,
-				     &feature_type);
+				     &feature_index);
 	if (ret)
 		return ret;
 
···
 	u8 *multiplier)
 {
 	u8 feature_index;
-	u8 feature_type;
 	int ret;
 	struct hidpp_report response;
 
 	ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_HIRES_WHEEL,
-				     &feature_index, &feature_type);
+				     &feature_index);
 	if (ret)
 		goto return_default;
 
···
 	bool high_resolution, bool use_hidpp)
 {
 	u8 feature_index;
-	u8 feature_type;
 	int ret;
 	u8 params[1];
 	struct hidpp_report response;
 
 	ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_HIRES_WHEEL,
-				     &feature_index, &feature_type);
+				     &feature_index);
 	if (ret)
 		return ret;
 
···
 {
 	struct hidpp_report response;
 	u8 params[2] = { 1, 1 };
-	u8 feature_type;
 	int ret;
 
 	if (hidpp->battery.feature_index == 0xff) {
 		ret = hidpp_root_get_feature(hidpp,
 					     HIDPP_PAGE_SOLAR_KEYBOARD,
-					     &hidpp->battery.solar_feature_index,
-					     &feature_type);
+					     &hidpp->battery.solar_feature_index);
 		if (ret)
 			return ret;
 	}
···
 			/* regular effect destroyed */
 			data->effect_ids[wd->params[0]-1] = -1;
 		else if (wd->effect_id >= HIDPP_FF_EFFECTID_AUTOCENTER)
-			/* autocenter spring destoyed */
+			/* autocenter spring destroyed */
 			data->slot_autocenter = 0;
 		break;
 	case HIDPP_FF_SET_GLOBAL_GAINS:
···
 {
 	struct wtp_data *wd = hidpp->private_data;
 	struct hidpp_touchpad_raw_info raw_info = {0};
-	u8 feature_type;
 	int ret;
 
 	ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_TOUCHPAD_RAW_XY,
-		&wd->mt_feature_index, &feature_type);
+		&wd->mt_feature_index);
 	if (ret)
 		/* means that the device is not powered up */
 		return ret;
···
 					 120);
 		}
 
-		v = hid_snto32(hid_field_extract(hdev, data+3, 0, 12), 12);
+		v = sign_extend32(hid_field_extract(hdev, data + 3, 0, 12), 11);
 		input_report_rel(hidpp->input, REL_X, v);
 
-		v = hid_snto32(hid_field_extract(hdev, data+3, 12, 12), 12);
+		v = sign_extend32(hid_field_extract(hdev, data + 3, 12, 12), 11);
 		input_report_rel(hidpp->input, REL_Y, v);
 
-		v = hid_snto32(data[6], 8);
+		v = sign_extend32(data[6], 7);
 		if (v != 0)
 			hidpp_scroll_counter_handle_scroll(hidpp->input,
 					&hidpp->vertical_wheel_counter, v);
···
 	struct k400_private_data *k400 = hidpp->private_data;
 	struct hidpp_touchpad_fw_items items = {};
 	int ret;
-	u8 feature_type;
 
 	if (!k400->feature_index) {
 		ret = hidpp_root_get_feature(hidpp,
 			HIDPP_PAGE_TOUCHPAD_FW_ITEMS,
-			&k400->feature_index, &feature_type);
+			&k400->feature_index);
 		if (ret)
 			/* means that the device is not powered up */
 			return ret;
···
 			   struct hidpp_ff_private_data *data)
 {
 	struct hidpp_report response;
-	u8 feature_type;
 	int ret;
 
 	memset(data, 0, sizeof(*data));
 
 	/* Find feature and store for later use */
 	ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_G920_FORCE_FEEDBACK,
-				     &data->feature_index, &feature_type);
+				     &data->feature_index);
 	if (ret)
 		return ret;
 
···
 
 	if (hidpp->protocol_major >= 2) {
 		u8 feature_index;
-		u8 feature_type;
 
 		ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_HIRES_WHEEL,
-					     &feature_index, &feature_type);
+					     &feature_index);
 		if (!ret) {
 			hidpp->capabilities |= HIDPP_CAPABILITY_HIDPP20_HI_RES_WHEEL;
 			hid_dbg(hidpp->hid_dev, "Detected HID++ 2.0 hi-res scroll wheel\n");
 			return 0;
 		}
 		ret = hidpp_root_get_feature(hidpp, HIDPP_PAGE_HI_RESOLUTION_SCROLLING,
-					     &feature_index, &feature_type);
+					     &feature_index);
 		if (!ret) {
 			hidpp->capabilities |= HIDPP_CAPABILITY_HIDPP20_HI_RES_SCROLL;
 			hid_dbg(hidpp->hid_dev, "Detected HID++ 2.0 hi-res scrolling\n");

drivers/hid/hid-magicmouse.c

···
 		touch_minor = tdata[4];
 		state = tdata[7] & TOUCH_STATE_MASK;
 		down = state != TOUCH_STATE_NONE;
-	} else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
+	} else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+		   input->id.product ==
+			   USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) {
 		id = tdata[8] & 0xf;
 		x = (tdata[1] << 27 | tdata[0] << 19) >> 19;
 		y = -((tdata[3] << 30 | tdata[2] << 22 | tdata[1] << 14) >> 19);
···
 	/* If requested, emulate a scroll wheel by detecting small
 	 * vertical touch motions.
 	 */
-	if (emulate_scroll_wheel && (input->id.product !=
-			USB_DEVICE_ID_APPLE_MAGICTRACKPAD2)) {
+	if (emulate_scroll_wheel &&
+	    input->id.product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 &&
+	    input->id.product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) {
 		unsigned long now = jiffies;
 		int step_x = msc->touches[id].scroll_x - x;
 		int step_y = msc->touches[id].scroll_y - y;
···
 		input_report_abs(input, ABS_MT_POSITION_X, x);
 		input_report_abs(input, ABS_MT_POSITION_Y, y);
 
-		if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2)
+		if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+		    input->id.product ==
+			    USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC)
 			input_report_abs(input, ABS_MT_PRESSURE, pressure);
 
 		if (report_undeciphered) {
···
 			    input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2)
 				input_event(input, EV_MSC, MSC_RAW, tdata[7]);
 			else if (input->id.product !=
-					USB_DEVICE_ID_APPLE_MAGICTRACKPAD2)
+					 USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 &&
+				 input->id.product !=
+					 USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC)
 				input_event(input, EV_MSC, MSC_RAW, tdata[8]);
 		}
 	}
···
 		magicmouse_emit_buttons(msc, clicks & 3);
 		input_report_rel(input, REL_X, x);
 		input_report_rel(input, REL_Y, y);
-	} else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
+	} else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+		   input->id.product ==
+			   USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) {
 		input_mt_sync_frame(input);
 		input_report_key(input, BTN_MOUSE, clicks & 1);
 	} else { /* USB_DEVICE_ID_APPLE_MAGICTRACKPAD */
···
 			__set_bit(REL_WHEEL_HI_RES, input->relbit);
 			__set_bit(REL_HWHEEL_HI_RES, input->relbit);
 		}
-	} else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
+	} else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+		   input->id.product ==
+			   USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) {
 		/* If the trackpad has been connected to a Mac, the name is
 		 * automatically personalized, e.g., "José Expósito's Trackpad".
 		 * When connected through Bluetooth, the personalized name is
···
 				  MOUSE_RES_X);
 		input_abs_set_res(input, ABS_MT_POSITION_Y,
 				  MOUSE_RES_Y);
-	} else if (input->id.product ==  USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
+	} else if (input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+		   input->id.product ==
+			   USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) {
 		input_set_abs_params(input, ABS_MT_PRESSURE, 0, 253, 0, 0);
 		input_set_abs_params(input, ABS_PRESSURE, 0, 253, 0, 0);
 		input_set_abs_params(input, ABS_MT_ORIENTATION, -3, 4, 0, 0);
···
 	input_set_events_per_packet(input, 60);
 
 	if (report_undeciphered &&
-	    input->id.product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
+	    input->id.product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 &&
+	    input->id.product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) {
 		__set_bit(EV_MSC, input->evbit);
 		__set_bit(MSC_RAW, input->mscbit);
 	}
···
 
 	/* Magic Trackpad does not give relative data after switching to MT */
 	if ((hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD ||
-	     hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) &&
+	     hi->input->id.product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+	     hi->input->id.product ==
+		     USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) &&
 	    field->flags & HID_MAIN_ITEM_RELATIVE)
 		return -1;
 
···
 	int ret;
 	int feature_size;
 
-	if (hdev->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
+	if (hdev->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+	    hdev->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) {
 		if (hdev->vendor == BT_VENDOR_ID_APPLE) {
 			feature_size = sizeof(feature_mt_trackpad2_bt);
 			feature = feature_mt_trackpad2_bt;
···
 
 	if (!hdev->battery || hdev->vendor != USB_VENDOR_ID_APPLE ||
 	    (hdev->product != USB_DEVICE_ID_APPLE_MAGICMOUSE2 &&
-	     hdev->product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2))
+	     hdev->product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 &&
+	     hdev->product != USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC))
 		return -1;
 
 	report_enum = &hdev->report_enum[hdev->battery_report_type];
···
 
 	if (id->vendor == USB_VENDOR_ID_APPLE &&
 	    (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2 ||
-	     (id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 && hdev->type != HID_TYPE_USBMOUSE)))
+	     ((id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+	       id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) &&
+	      hdev->type != HID_TYPE_USBMOUSE)))
 		return 0;
 
 	if (!msc->input) {
···
 	else if (id->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2)
 		report = hid_register_report(hdev, HID_INPUT_REPORT,
 			MOUSE2_REPORT_ID, 0);
-	else if (id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) {
+	else if (id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+		 id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) {
 		if (id->vendor == BT_VENDOR_ID_APPLE)
 			report = hid_register_report(hdev, HID_INPUT_REPORT,
 				TRACKPAD2_BT_REPORT_ID, 0);
···
 	 */
 	if (hdev->vendor == USB_VENDOR_ID_APPLE &&
 	    (hdev->product == USB_DEVICE_ID_APPLE_MAGICMOUSE2 ||
-	     hdev->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2) &&
+	     hdev->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 ||
+	     hdev->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC) &&
 	    *rsize == 83 && rdesc[46] == 0x84 && rdesc[58] == 0x85) {
 		hid_info(hdev,
 			 "fixing up magicmouse battery report descriptor\n");
···
 		USB_DEVICE_ID_APPLE_MAGICTRACKPAD2), .driver_data = 0 },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE,
 		USB_DEVICE_ID_APPLE_MAGICTRACKPAD2), .driver_data = 0 },
+	{ HID_BLUETOOTH_DEVICE(BT_VENDOR_ID_APPLE,
+		USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC), .driver_data = 0 },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE,
+		USB_DEVICE_ID_APPLE_MAGICTRACKPAD2_USBC), .driver_data = 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, magic_mice);

drivers/hid/hid-multitouch.c

···
  * [1] https://gitlab.freedesktop.org/libevdev/hid-tools
  */
 
+#include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/hid.h>
 #include <linux/module.h>
···
 enum latency_mode {
 	HID_LATENCY_NORMAL = 0,
 	HID_LATENCY_HIGH = 1,
+};
+
+enum report_mode {
+	TOUCHPAD_REPORT_NONE = 0,
+	TOUCHPAD_REPORT_BUTTONS = BIT(0),
+	TOUCHPAD_REPORT_CONTACTS = BIT(1),
+	TOUCHPAD_REPORT_ALL = TOUCHPAD_REPORT_BUTTONS | TOUCHPAD_REPORT_CONTACTS,
 };
 
 #define MT_IO_FLAGS_RUNNING		0
···
 				     struct hid_field *field,
 				     struct hid_usage *usage,
 				     enum latency_mode latency,
-				     bool surface_switch,
-				     bool button_switch,
+				     enum report_mode report_mode,
 				     bool *inputmode_found)
 {
 	struct mt_device *td = hid_get_drvdata(hdev);
···
 		return true;
 
 	case HID_DG_SURFACESWITCH:
-		field->value[index] = surface_switch;
+		field->value[index] = !!(report_mode & TOUCHPAD_REPORT_CONTACTS);
 		return true;
 
 	case HID_DG_BUTTONSWITCH:
-		field->value[index] = button_switch;
+		field->value[index] = !!(report_mode & TOUCHPAD_REPORT_BUTTONS);
 		return true;
 	}
 
···
 }
 
 static void mt_set_modes(struct hid_device *hdev, enum latency_mode latency,
-			 bool surface_switch, bool button_switch)
+			 enum report_mode report_mode)
 {
 	struct hid_report_enum *rep_enum;
 	struct hid_report *rep;
···
 							     rep->field[i],
 							     usage,
 							     latency,
-							     surface_switch,
-							     button_switch,
+							     report_mode,
 							     &inputmode_found))
 					update_report = true;
 			}
···
 		dev_warn(&hdev->dev, "Cannot allocate sysfs group for %s\n",
 				hdev->name);
 
-	mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
+	mt_set_modes(hdev, HID_LATENCY_NORMAL, TOUCHPAD_REPORT_ALL);
 
 	return 0;
 }
···
 	/* High latency is desirable for power savings during S3/S0ix */
 	if ((td->mtclass.quirks & MT_QUIRK_DISABLE_WAKEUP) ||
 	    !hid_hw_may_wakeup(hdev))
-		mt_set_modes(hdev, HID_LATENCY_HIGH, false, false);
+		mt_set_modes(hdev, HID_LATENCY_HIGH, TOUCHPAD_REPORT_NONE);
 	else
-		mt_set_modes(hdev, HID_LATENCY_HIGH, true, true);
+		mt_set_modes(hdev, HID_LATENCY_HIGH, TOUCHPAD_REPORT_ALL);
 
 	return 0;
 }
···
 static int mt_reset_resume(struct hid_device *hdev)
 {
 	mt_release_contacts(hdev);
-	mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
+	mt_set_modes(hdev, HID_LATENCY_NORMAL, TOUCHPAD_REPORT_ALL);
 	return 0;
 }
 
···
 
 	hid_hw_idle(hdev, 0, 0, HID_REQ_SET_IDLE);
 
-	mt_set_modes(hdev, HID_LATENCY_NORMAL, true, true);
+	mt_set_modes(hdev, HID_LATENCY_NORMAL, TOUCHPAD_REPORT_ALL);
 
 	return 0;
 }

drivers/hid/hid-picolcd_fb.c

···
 	/* make sure no work is deferred */
 	fb_deferred_io_cleanup(info);
 
-	/* No thridparty should ever unregister our framebuffer! */
+	/* No thirdparty should ever unregister our framebuffer! */
 	WARN_ON(fbdata->picolcd != NULL);
 
 	vfree((u8 *)info->fix.smem_start);

drivers/hid/hid-sensor-custom.c

···
 
 	memcpy(real_usage, match->luid, 4);
 
-	/* usage id are all lowcase */
+	/* usage id are all lowercase */
 	for (c = real_usage; *c != '\0'; c++)
 		*c = tolower(*c);
 

drivers/hid/hid-sony.c

···
 	u8 max_brightness[MAX_LEDS] = { [0 ... (MAX_LEDS - 1)] = 1 };
 	u8 use_hw_blink[MAX_LEDS] = { 0 };
 
-	BUG_ON(!(sc->quirks & SONY_LED_SUPPORT));
+	if (WARN_ON(!(sc->quirks & SONY_LED_SUPPORT)))
+		return -EINVAL;
 
 	if (sc->quirks & BUZZ_CONTROLLER) {
 		sc->led_count = 4;

drivers/hid/hid-steam.c

···
 	ID_CONTROLLER_DECK_STATE = 9
 };
 
-/* String attribute idenitifiers */
+/* String attribute identifiers */
 enum {
 	ATTRIB_STR_BOARD_SERIAL,
 	ATTRIB_STR_UNIT_SERIAL,

drivers/hid/hid-steelseries.c

···
 			"Battery query failed (err: %d)\n", ret);
 }
 
+static int battery_capacity_to_level(int capacity)
+{
+	if (capacity >= 50)
+		return POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+	if (capacity >= 20)
+		return POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+	return POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+}
+
 static void steelseries_headset_battery_timer_tick(struct work_struct *work)
 {
 	struct steelseries_device *sd = container_of(work,
···
 	case POWER_SUPPLY_PROP_CAPACITY:
 		val->intval = sd->battery_capacity;
 		break;
+	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+		val->intval = battery_capacity_to_level(sd->battery_capacity);
+		break;
 	default:
 		ret = -EINVAL;
 		break;
···
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_SCOPE,
 	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 };
 
 static int steelseries_headset_battery_register(struct steelseries_device *sd)
···
 		hid_dbg(sd->hdev,
 			"Parsing raw event for Arctis 1 headset (%*ph)\n", size, read_buf);
 		if (size < ARCTIS_1_BATTERY_RESPONSE_LEN ||
-		    memcmp (read_buf, arctis_1_battery_request, sizeof(arctis_1_battery_request)))
+		    memcmp(read_buf, arctis_1_battery_request, sizeof(arctis_1_battery_request))) {
+			if (!delayed_work_pending(&sd->battery_work))
+				goto request_battery;
 			return 0;
+		}
 		if (read_buf[2] == 0x01) {
 			connected = false;
 			capacity = 100;
···
 		power_supply_changed(sd->battery);
 	}
 
+request_battery:
 	spin_lock_irqsave(&sd->lock, flags);
 	if (!sd->removed)
 		schedule_delayed_work(&sd->battery_work,

drivers/hid/i2c-hid/i2c-hid-of.c

···
 #endif
 
 static const struct i2c_device_id i2c_hid_of_id_table[] = {
-	{ "hid", 0 },
-	{ "hid-over-i2c", 0 },
-	{ },
+	{ "hid" },
+	{ "hid-over-i2c" },
+	{ }
 };
 MODULE_DEVICE_TABLE(i2c, i2c_hid_of_id_table);
 

drivers/hid/intel-ish-hid/ipc/pci-ish.c

···
 
 static SIMPLE_DEV_PM_OPS(ish_pm_ops, ish_suspend, ish_resume);
 
+static ssize_t base_version_show(struct device *cdev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct ishtp_device *dev = dev_get_drvdata(cdev);
+
+	return sysfs_emit(buf, "%u.%u.%u.%u\n", dev->base_ver.major,
+			  dev->base_ver.minor, dev->base_ver.hotfix,
+			  dev->base_ver.build);
+}
+static DEVICE_ATTR_RO(base_version);
+
+static ssize_t project_version_show(struct device *cdev,
+				    struct device_attribute *attr, char *buf)
+{
+	struct ishtp_device *dev = dev_get_drvdata(cdev);
+
+	return sysfs_emit(buf, "%u.%u.%u.%u\n", dev->prj_ver.major,
+			  dev->prj_ver.minor, dev->prj_ver.hotfix,
+			  dev->prj_ver.build);
+}
+static DEVICE_ATTR_RO(project_version);
+
+static struct attribute *ish_firmware_attrs[] = {
+	&dev_attr_base_version.attr,
+	&dev_attr_project_version.attr,
+	NULL
+};
+
+static umode_t firmware_is_visible(struct kobject *kobj, struct attribute *attr,
+				   int i)
+{
+	struct ishtp_device *dev = dev_get_drvdata(kobj_to_dev(kobj));
+
+	return dev->driver_data->fw_generation ? attr->mode : 0;
+}
+
+static const struct attribute_group ish_firmware_group = {
+	.name = "firmware",
+	.attrs = ish_firmware_attrs,
+	.is_visible = firmware_is_visible,
+};
+
+__ATTRIBUTE_GROUPS(ish_firmware);
+
 static struct pci_driver ish_driver = {
 	.name = KBUILD_MODNAME,
 	.id_table = ish_pci_tbl,
···
 	.remove = ish_remove,
 	.shutdown = ish_shutdown,
 	.driver.pm = &ish_pm_ops,
+	.dev_groups = ish_firmware_groups,
 };
 
 module_pci_driver(ish_driver);

drivers/hid/intel-ish-hid/ishtp-fw-loader.c

···
 	if (rv < 0)
 		goto end_err_fw_release;
 
-	/* Step 3: Start ISH main firmware exeuction */
+	/* Step 3: Start ISH main firmware execution */
 
 	rv = ish_fw_start(client_data);
 	if (rv < 0)

drivers/hid/intel-ish-hid/ishtp-hid-client.c

···
 	unsigned char *payload;
 	struct device_info *dev_info;
 	int i, j;
-	size_t	payload_len, total_len, cur_pos, raw_len;
+	size_t	payload_len, total_len, cur_pos, raw_len, msg_len;
 	int report_type;
 	struct report_list *reports_list;
-	char *reports;
+	struct report *report;
 	size_t report_len;
 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
 	int curr_hid_dev = client_data->cur_hid_dev;
···
 		case HOSTIF_PUBLISH_INPUT_REPORT_LIST:
 			report_type = HID_INPUT_REPORT;
 			reports_list = (struct report_list *)payload;
-			reports = (char *)reports_list->reports;
+			report = reports_list->reports;
 
 			for (j = 0; j < reports_list->num_of_reports; j++) {
-				recv_msg = (struct hostif_msg *)(reports +
-					sizeof(uint16_t));
-				report_len = *(uint16_t *)reports;
-				payload = reports + sizeof(uint16_t) +
-					sizeof(struct hostif_msg_hdr);
+				recv_msg = container_of(&report->msg,
+							struct hostif_msg, hdr);
+				report_len = report->size;
+				payload = recv_msg->payload;
 				payload_len = report_len -
 					sizeof(struct hostif_msg_hdr);
 
···
 						0);
 					}
 
-				reports += sizeof(uint16_t) + report_len;
+				report += sizeof(*report) + payload_len;
 			}
 			break;
 		default:
···
 
 		}
 
-		if (!cur_pos && cur_pos + payload_len +
-				sizeof(struct hostif_msg) < total_len)
+		msg_len = payload_len + sizeof(struct hostif_msg);
+		if (!cur_pos && cur_pos + msg_len < total_len)
 			++client_data->multi_packet_cnt;
 
-		cur_pos += payload_len + sizeof(struct hostif_msg);
-		payload += payload_len + sizeof(struct hostif_msg);
+		cur_pos += msg_len;
+		payload += msg_len;
 
 	} while (cur_pos < total_len);
 }

drivers/hid/intel-ish-hid/ishtp-hid.h

···
 
 struct hostif_msg {
 	struct hostif_msg_hdr	hdr;
+	uint8_t payload[];
 } __packed;
 
 struct hostif_msg_to_sensor {
···
 	uint16_t build;
 } __packed;
 
+struct report {
+	uint16_t size;
+	struct hostif_msg_hdr msg;
+} __packed;
+
 /* struct for ISHTP aggregated input data */
 struct report_list {
 	uint16_t total_size;
 	uint8_t	num_of_reports;
 	uint8_t	flags;
-	struct {
-		uint16_t	size_of_report;
-		uint8_t report[1];
-	} __packed reports[1];
+	struct report reports[];
 } __packed;
 
 /* HOSTIF commands */

drivers/hid/intel-ish-hid/ishtp/client.c

···
 			/* Send ipc fragment */
 			ishtp_hdr.length = dev->mtu;
 			ishtp_hdr.msg_complete = 0;
-			/* All fregments submitted to IPC queue with no callback */
+			/* All fragments submitted to IPC queue with no callback */
 			ishtp_write_message(dev, &ishtp_hdr, pmsg);
 			cl->tx_offs += dev->mtu;
 			rem = cl_msg->send_buf.size - cl->tx_offs;

drivers/hid/intel-ish-hid/ishtp/ishtp-dev.h

···
 	char *fw_generation;
 };
 
+struct ish_version {
+	u16 major;
+	u16 minor;
+	u16 hotfix;
+	u16 build;
+};
+
 /**
  * struct ishtp_device - ISHTP private device struct
  */
···
 
 	/* Dump to trace buffers if enabled*/
 	ishtp_print_log print_log;
+
+	/* Base version of Intel's released firmware */
+	struct ish_version base_ver;
+	/* Vendor-customized project version */
+	struct ish_version prj_ver;
 
 	/* Debug stats */
 	unsigned int	ipc_rx_cnt;

drivers/hid/intel-ish-hid/ishtp/loader.c

···
 	return _request_ish_firmware(firmware_p, filename, dev);
 }
 
+static int copy_manifest(const struct firmware *fw, struct ish_global_manifest *manifest)
+{
+	u32 offset;
+
+	for (offset = 0; offset + sizeof(*manifest) < fw->size; offset += ISH_MANIFEST_ALIGNMENT) {
+		memcpy(manifest, fw->data + offset, sizeof(*manifest));
+
+		if (le32_to_cpu(manifest->sig_fourcc) == ISH_GLOBAL_SIG)
+			return 0;
+	}
+
+	return -1;
+}
+
+static void copy_ish_version(struct version_in_manifest *src, struct ish_version *dst)
+{
+	dst->major = le16_to_cpu(src->major);
+	dst->minor = le16_to_cpu(src->minor);
+	dst->hotfix = le16_to_cpu(src->hotfix);
+	dst->build = le16_to_cpu(src->build);
+}
+
 /**
  * ishtp_loader_work() - Load the ISHTP firmware
  * @work: The work structure
···
 	struct loader_xfer_query query = { .header = cpu_to_le32(query_hdr.val32), };
 	struct loader_start start = { .header = cpu_to_le32(start_hdr.val32), };
 	union loader_recv_message recv_msg;
+	struct ish_global_manifest manifest;
 	const struct firmware *ish_fw;
 	void *dma_bufs[FRAGMENT_MAX_NUM] = {};
 	u32 fragment_size;
···
 		if (rv)
 			continue; /* try again if failed */
 
-		dev_dbg(dev->devc, "ISH Version %u.%u.%u.%u\n",
+		dev_dbg(dev->devc, "ISH Bootloader Version %u.%u.%u.%u\n",
 			recv_msg.query_ack.version_major,
 			recv_msg.query_ack.version_minor,
 			recv_msg.query_ack.version_hotfix,
···
 			continue; /* try again if failed */
 
 		dev_info(dev->devc, "firmware loaded. size:%zu\n", ish_fw->size);
+		if (!copy_manifest(ish_fw, &manifest)) {
+			copy_ish_version(&manifest.base_ver, &dev->base_ver);
+			copy_ish_version(&manifest.prj_ver, &dev->prj_ver);
+			dev_info(dev->devc, "FW base version: %u.%u.%u.%u\n",
+				 dev->base_ver.major, dev->base_ver.minor,
+				 dev->base_ver.hotfix, dev->base_ver.build);
+			dev_info(dev->devc, "FW project version: %u.%u.%u.%u\n",
+				 dev->prj_ver.major, dev->prj_ver.minor,
+				 dev->prj_ver.hotfix, dev->prj_ver.build);
+		}
 		break;
 	} while (--retry);
 

drivers/hid/intel-ish-hid/ishtp/loader.h

···
 
 #include <linux/bits.h>
 #include <linux/jiffies.h>
+#include <linux/sizes.h>
 #include <linux/types.h>
 
 #include "ishtp-dev.h"
···
  * @work: The work structure
  */
 void ishtp_loader_work(struct work_struct *work);
+
+/* ISH Manifest alignment in binary is 4KB aligned */
+#define ISH_MANIFEST_ALIGNMENT SZ_4K
+
+/* Signature for ISH global manifest */
+#define ISH_GLOBAL_SIG 0x47485349	/* FourCC 'I', 'S', 'H', 'G' */
+
+struct version_in_manifest {
+	__le16 major;
+	__le16 minor;
+	__le16 hotfix;
+	__le16 build;
+};
+
+/**
+ * struct ish_global_manifest - global manifest for ISH
+ * @sig_fourcc: Signature FourCC, should be 'I', 'S', 'H', 'G'.
+ * @len: Length of the manifest.
+ * @header_version: Version of the manifest header.
+ * @flags: Flags for additional information.
+ * @base_ver: Base version of Intel's released firmware.
+ * @reserved: Reserved space for future use.
+ * @prj_ver: Vendor-customized project version.
+ */
+struct ish_global_manifest {
+	__le32 sig_fourcc;
+	__le32 len;
+	__le32 header_version;
+	__le32 flags;
+	struct version_in_manifest base_ver;
+	__le32 reserved[13];
+	struct version_in_manifest prj_ver;
+};
 
 #endif /* _ISHTP_LOADER_H_ */

drivers/hid/usbhid/hid-core.c

···
 
 		interval = endpoint->bInterval;
 
-		/* Some vendors give fullspeed interval on highspeed devides */
+		/* Some vendors give fullspeed interval on highspeed devices */
 		if (hid->quirks & HID_QUIRK_FULLSPEED_INTERVAL &&
 		    dev->speed == USB_SPEED_HIGH) {
 			interval = fls(endpoint->bInterval*8);

drivers/hid/wacom_wac.c

···
 					rotation -= 1800;
 
 				input_report_abs(pen_input, ABS_TILT_X,
-						 (char)frame[7]);
+						 (signed char)frame[7]);
 				input_report_abs(pen_input, ABS_TILT_Y,
-						 (char)frame[8]);
+						 (signed char)frame[8]);
 				input_report_abs(pen_input, ABS_Z, rotation);
 				input_report_abs(pen_input, ABS_WHEEL,
 						 get_unaligned_le16(&frame[11]));
···
 			wacom_wac->hid_data.sense_state = value;
 		return;
 	case HID_DG_INVERT:
-		wacom_wac->hid_data.invert_state = value;
+		wacom_wac->hid_data.eraser |= value;
 		return;
 	case HID_DG_ERASER:
+		wacom_wac->hid_data.eraser |= value;
+		fallthrough;
 	case HID_DG_TIPSWITCH:
 		wacom_wac->hid_data.tipswitch |= value;
 		return;
···
 
 	if (entering_range) { /* first in range */
 		/* Going into range select tool */
-		if (wacom_wac->hid_data.invert_state)
+		if (wacom_wac->hid_data.eraser)
 			wacom_wac->tool[0] = BTN_TOOL_RUBBER;
 		else if (wacom_wac->features.quirks & WACOM_QUIRK_AESPEN)
 			wacom_wac->tool[0] = BTN_TOOL_PEN;
···
 		}
 
 		wacom_wac->hid_data.tipswitch = false;
+		wacom_wac->hid_data.eraser = false;
 
 		input_sync(input);
 	}

drivers/hid/wacom_wac.h

···
 	__s16 inputmode_index;	/* InputMode HID feature index in the report */
 	bool sense_state;
 	bool inrange_state;
-	bool invert_state;
+	bool eraser;
 	bool tipswitch;
 	bool barrelswitch;
 	bool barrelswitch2;

include/linux/hid.h

···
  * | @HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP:
  * | @HID_QUIRK_HAVE_SPECIAL_DRIVER:
  * | @HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE:
+ * | @HID_QUIRK_IGNORE_SPECIAL_DRIVER
  * | @HID_QUIRK_FULLSPEED_INTERVAL:
  * | @HID_QUIRK_NO_INIT_REPORTS:
  * | @HID_QUIRK_NO_IGNORE:
···
 #define HID_QUIRK_HAVE_SPECIAL_DRIVER		BIT(19)
 #define HID_QUIRK_INCREMENT_USAGE_ON_DUPLICATE	BIT(20)
 #define HID_QUIRK_NOINVERT			BIT(21)
+#define HID_QUIRK_IGNORE_SPECIAL_DRIVER		BIT(22)
 #define HID_QUIRK_FULLSPEED_INTERVAL		BIT(28)
 #define HID_QUIRK_NO_INIT_REPORTS		BIT(29)
 #define HID_QUIRK_NO_IGNORE			BIT(30)
···
 struct hid_driver;
 struct hid_ll_driver;
 
-struct hid_device {							/* device report descriptor */
-	const __u8 *dev_rdesc;
-	unsigned dev_rsize;
-	const __u8 *rdesc;
-	unsigned rsize;
+struct hid_device {
+	const __u8 *dev_rdesc;						/* device report descriptor */
+	const __u8 *bpf_rdesc;						/* bpf modified report descriptor, if any */
+	const __u8 *rdesc;						/* currently used report descriptor */
+	unsigned int dev_rsize;
+	unsigned int bpf_rsize;
+	unsigned int rsize;
+	unsigned int collection_size;					/* Number of allocated hid_collections */
 	struct hid_collection *collection;				/* List of HID collections */
-	unsigned collection_size;					/* Number of allocated hid_collections */
-	unsigned maxcollection;						/* Number of parsed collections */
-	unsigned maxapplication;					/* Number of applications */
+	unsigned int maxcollection;						/* Number of parsed collections */
+	unsigned int maxapplication;					/* Number of applications */
 	__u16 bus;							/* BUS ID */
 	__u16 group;							/* Report group */
 	__u32 vendor;							/* Vendor ID */
···
 					     struct hid_driver *hdrv);
 bool hid_compare_device_paths(struct hid_device *hdev_a,
 			      struct hid_device *hdev_b, char separator);
-s32 hid_snto32(__u32 value, unsigned n);
 __u32 hid_field_extract(const struct hid_device *hid, __u8 *report,
 		     unsigned offset, unsigned n);
 

include/linux/hid_bpf.h

···
 void hid_bpf_disconnect_device(struct hid_device *hdev);
 void hid_bpf_destroy_device(struct hid_device *hid);
 int hid_bpf_device_init(struct hid_device *hid);
-u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, const u8 *rdesc, unsigned int *size);
+const u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, const u8 *rdesc, unsigned int *size);
 #else /* CONFIG_HID_BPF */
 static inline u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
 						u8 *data, u32 *size, int interrupt,
···
 static inline void hid_bpf_disconnect_device(struct hid_device *hdev) {}
 static inline void hid_bpf_destroy_device(struct hid_device *hid) {}
 static inline int hid_bpf_device_init(struct hid_device *hid) { return 0; }
-/*
- * This specialized allocator has to be a macro for its allocations to be
- * accounted separately (to have a separate alloc_tag). The typecast is
- * intentional to enforce typesafety.
- */
-#define call_hid_bpf_rdesc_fixup(_hdev, _rdesc, _size)	\
-		((u8 *)kmemdup(_rdesc, *(_size), GFP_KERNEL))
+static inline const u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, const u8 *rdesc,
+						 unsigned int *size) { return rdesc; }
 
 #endif /* CONFIG_HID_BPF */
 

tools/testing/selftests/hid/Makefile

···
 	$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
 	$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
 
-$(OUTPUT)/%.o: %.c $(BPF_SKELS)
+$(OUTPUT)/%.o: %.c $(BPF_SKELS) hid_common.h
 	$(call msg,CC,,$@)
 	$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
 

tools/testing/selftests/hid/hid_bpf.c

···
 #include "hid_common.h"
 #include <bpf/bpf.h>
 
-struct attach_prog_args {
-	int prog_fd;
-	unsigned int hid;
-	int retval;
-	int insert_head;
-};
-
 struct hid_hw_request_syscall_args {
 	__u8 data[10];
 	unsigned int hid;
···
 };
 
 FIXTURE(hid_bpf) {
-	int dev_id;
-	int uhid_fd;
+	struct uhid_device hid;
 	int hidraw_fd;
-	int hid_id;
-	pthread_t tid;
 	struct hid *skel;
 	struct bpf_link *hid_links[3]; /* max number of programs loaded in a single test */
 };
···
 FIXTURE_TEARDOWN(hid_bpf) {
 	void *uhid_err;
 
-	uhid_destroy(_metadata, self->uhid_fd);
+	uhid_destroy(_metadata, &self->hid);
 
 	detach_bpf(self);
-	pthread_join(self->tid, &uhid_err);
+	pthread_join(self->hid.tid, &uhid_err);
 }
 #define TEARDOWN_LOG(fmt, ...) do { \
 	TH_LOG(fmt, ##__VA_ARGS__); \
 	hid_bpf_teardown(_metadata, self, variant); \
 } while (0)
 
+struct specific_device {
+	const char test_name[64];
+	__u16 bus;
+	__u32 vid;
+	__u32 pid;
+};
+
 FIXTURE_SETUP(hid_bpf)
 {
-	time_t t;
+	const struct specific_device *match = NULL;
 	int err;
 
-	/* initialize random number generator */
-	srand((unsigned int)time(&t));
+	const struct specific_device devices[] = {
+	{
+		.test_name = "test_hid_driver_probe",
+		.bus = BUS_BLUETOOTH,
+		.vid = 0x05ac,  /* USB_VENDOR_ID_APPLE */
+		.pid = 0x022c,  /* USB_DEVICE_ID_APPLE_ALU_WIRELESS_ANSI */
+	}, {
+		.test_name = "*",
+		.bus = BUS_USB,
+		.vid = 0x0001,
+		.pid = 0x0a36,
+	}};
 
-	self->dev_id = rand() % 1024;
+	for (int i = 0; i < ARRAY_SIZE(devices); i++) {
+		match = &devices[i];
+		if (!strncmp(_metadata->name, devices[i].test_name, sizeof(devices[i].test_name)))
+			break;
+	}
 
-	self->uhid_fd = setup_uhid(_metadata, self->dev_id);
+	ASSERT_OK_PTR(match);
 
-	/* locate the uev, self, variant);ent file of the created device */
-	self->hid_id = get_hid_id(self->dev_id);
-	ASSERT_GT(self->hid_id, 0)
-		TEARDOWN_LOG("Could not locate uhid device id: %d", self->hid_id);
-
-	err = uhid_start_listener(_metadata, &self->tid, self->uhid_fd);
-	ASSERT_EQ(0, err) TEARDOWN_LOG("could not start udev listener: %d", err);
+	err = setup_uhid(_metadata, &self->hid, match->bus, match->vid, match->pid,
+			 rdesc, sizeof(rdesc));
+	ASSERT_OK(err);
 }
 
 struct test_program {
···
 		ops_hid_id = bpf_map__initial_value(map, NULL);
 		ASSERT_OK_PTR(ops_hid_id) TH_LOG("unable to retrieve struct_ops data");
 
-		*ops_hid_id = self->hid_id;
+		*ops_hid_id = self->hid.hid_id;
 	}
 
 	/* we disable the auto-attach feature of all maps because we
···
 
 	hid__attach(self->skel);
 
-	self->hidraw_fd = open_hidraw(self->dev_id);
+	self->hidraw_fd = open_hidraw(&self->hid);
 	ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
 }
 
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* check that hid_first_event() was executed */
 	ASSERT_EQ(self->skel->data->callback_check, 42) TH_LOG("callback_check1");
···
 	memset(buf, 0, sizeof(buf));
 	buf[0] = 1;
 	buf[1] = 47;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* check that hid_first_event() was executed */
 	ASSERT_EQ(self->skel->data->callback_check, 47) TH_LOG("callback_check1");
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	memset(buf, 0, sizeof(buf));
 	buf[0] = 1;
 	buf[1] = 47;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* detach the program */
 	detach_bpf(self);
 
-	self->hidraw_fd = open_hidraw(self->dev_id);
+	self->hidraw_fd = open_hidraw(&self->hid);
 	ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
 
 	/* inject another event */
 	memset(buf, 0, sizeof(buf));
 	buf[0] = 1;
 	buf[1] = 47;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	memset(buf, 0, sizeof(buf));
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 
 	LOAD_BPF;
 
-	args.hid = self->hid_id;
+	args.hid = self->hid.hid_id;
 	args.data[0] = 1; /* report ID */
 	args.data[1] = 2; /* report ID */
 	args.data[2] = 42; /* report ID */
···
 
 	LOAD_BPF;
 
-	args.hid = self->hid_id;
+	args.hid = self->hid.hid_id;
 	args.data[0] = 1; /* report ID */
 	args.data[1] = 2; /* report ID */
 	args.data[2] = 42; /* report ID */
···
 
 	LOAD_BPF;
 
-	args.hid = self->hid_id;
+	args.hid = self->hid.hid_id;
 	args.data[0] = 1; /* report ID */
 
 	prog_fd = bpf_program__fd(self->skel->progs.hid_user_raw_request);
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* detach the program */
 	detach_bpf(self);
 
-	self->hidraw_fd = open_hidraw(self->dev_id);
+	self->hidraw_fd = open_hidraw(&self->hid);
 	ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
 
 	err = ioctl(self->hidraw_fd, HIDIOCGFEATURE(sizeof(buf)), buf);
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* detach the program */
 	detach_bpf(self);
 
-	self->hidraw_fd = open_hidraw(self->dev_id);
+	self->hidraw_fd = open_hidraw(&self->hid);
 	ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
 
 	err = write(self->hidraw_fd, buf, 3);
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	buf[1] = 2;
 	buf[2] = 42;
 
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 
 	/* inject one event */
 	buf[0] = 1;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	ASSERT_EQ(buf[1], 1);
 	ASSERT_EQ(buf[2], 2);
 	ASSERT_EQ(buf[3], 3);
+}
+
+static bool is_using_driver(struct __test_metadata *_metadata, struct uhid_device *hid,
+			    const char *driver)
+{
+	char driver_line[512];
+	char uevent[1024];
+	char temp[512];
+	int fd, nread;
+	bool found = false;
+
+	sprintf(uevent, "/sys/bus/hid/devices/%04X:%04X:%04X.%04X/uevent",
+		hid->bus, hid->vid, hid->pid, hid->hid_id);
+
+	fd = open(uevent, O_RDONLY | O_NONBLOCK);
+	if (fd < 0) {
+		TH_LOG("couldn't open '%s': %d, %d", uevent, fd, errno);
+		return false;
+	}
+
+	sprintf(driver_line, "DRIVER=%s", driver);
+
+	nread = read(fd, temp, ARRAY_SIZE(temp));
+	if (nread > 0 && (strstr(temp, driver_line)) != NULL)
+		found = true;
+
+	close(fd);
+
+	return found;
+}
+
+/*
+ * Attach hid_driver_probe to the given uhid device,
+ * check that the device is now using hid-generic.
+ */
+TEST_F(hid_bpf, test_hid_driver_probe)
+{
+	const struct test_program progs[] = {
+		{
+			.name = "hid_test_driver_probe",
+		},
+	};
+
+	ASSERT_TRUE(is_using_driver(_metadata, &self->hid, "apple"));
+
+	LOAD_PROGRAMS(progs);
+
+	ASSERT_TRUE(is_using_driver(_metadata, &self->hid, "hid-generic"));
 }
 
 /*

tools/testing/selftests/hid/hid_common.h

···
 	__typeof__(b) _b = (b); \
 	_a < _b ? _a : _b; })
 
+struct uhid_device {
+	int dev_id;		/* uniq (random) number to identify the device */
+	int uhid_fd;
+	int hid_id;		/* HID device id in the system */
+	__u16 bus;
+	__u32 vid;
+	__u32 pid;
+	pthread_t tid;		/* thread for reading uhid events */
+};
+
 static unsigned char rdesc[] = {
 	0x06, 0x00, 0xff,	/* Usage Page (Vendor Defined Page 1) */
 	0x09, 0x21,		/* Usage (Vendor Usage 0x21) */
···
 	}
 }
 
-static int uhid_create(struct __test_metadata *_metadata, int fd, int rand_nb)
+static int uhid_create(struct __test_metadata *_metadata, int fd, int rand_nb,
+		       __u16 bus, __u32 vid, __u32 pid, __u8 *rdesc,
+		       size_t rdesc_size)
 {
 	struct uhid_event ev;
 	char buf[25];
···
 	ev.type = UHID_CREATE;
 	strcpy((char *)ev.u.create.name, buf);
 	ev.u.create.rd_data = rdesc;
-	ev.u.create.rd_size = sizeof(rdesc);
-	ev.u.create.bus = BUS_USB;
-	ev.u.create.vendor = 0x0001;
-	ev.u.create.product = 0x0a37;
+	ev.u.create.rd_size = rdesc_size;
+	ev.u.create.bus = bus;
+	ev.u.create.vendor = vid;
+	ev.u.create.product = pid;
 	ev.u.create.version = 0;
 	ev.u.create.country = 0;
 
···
 	return uhid_write(_metadata, fd, &ev);
 }
 
-static void uhid_destroy(struct __test_metadata *_metadata, int fd)
+static void uhid_destroy(struct __test_metadata *_metadata, struct uhid_device *hid)
 {
 	struct uhid_event ev;
 
 	memset(&ev, 0, sizeof(ev));
 	ev.type = UHID_DESTROY;
 
-	uhid_write(_metadata, fd, &ev);
+	uhid_write(_metadata, hid->uhid_fd, &ev);
 }
 
 static int uhid_event(struct __test_metadata *_metadata, int fd)
···
 	return 0;
 }
 
-static int uhid_send_event(struct __test_metadata *_metadata, int fd, __u8 *buf, size_t size)
+static int uhid_send_event(struct __test_metadata *_metadata, struct uhid_device *hid,
+			   __u8 *buf, size_t size)
 {
 	struct uhid_event ev;
 
···
 
 	memcpy(ev.u.input2.data, buf, size);
 
-	return uhid_write(_metadata, fd, &ev);
+	return uhid_write(_metadata, hid->uhid_fd, &ev);
 }
 
-static int setup_uhid(struct __test_metadata *_metadata, int rand_nb)
+static bool match_sysfs_device(struct uhid_device *hid, const char *workdir, struct dirent *dir)
 {
-	int fd;
-	const char *path = "/dev/uhid";
-	int ret;
-
-	fd = open(path, O_RDWR | O_CLOEXEC);
-	ASSERT_GE(fd, 0) TH_LOG("open uhid-cdev failed; %d", fd);
-
-	ret = uhid_create(_metadata, fd, rand_nb);
-	ASSERT_EQ(0, ret) {
-		TH_LOG("create uhid device failed: %d", ret);
-		close(fd);
-	}
-
-	return fd;
-}
-
-static bool match_sysfs_device(int dev_id, const char *workdir, struct dirent *dir)
-{
-	const char *target = "0003:0001:0A37.*";
+	char target[20] = "";
 	char phys[512];
 	char uevent[1024];
 	char temp[512];
 	int fd, nread;
 	bool found = false;
+
+	snprintf(target, sizeof(target), "%04X:%04X:%04X.*", hid->bus, hid->vid, hid->pid);
 
 	if (fnmatch(target, dir->d_name, 0))
 		return false;
···
 	if (fd < 0)
 		return false;
 
-	sprintf(phys, "PHYS=%d", dev_id);
+	sprintf(phys, "PHYS=%d", hid->dev_id);
 
 	nread = read(fd, temp, ARRAY_SIZE(temp));
 	if (nread > 0 && (strstr(temp, phys)) != NULL)
···
 	return found;
 }
 
-static int get_hid_id(int dev_id)
+static int get_hid_id(struct uhid_device *hid)
 {
 	const char *workdir = "/sys/devices/virtual/misc/uhid";
 	const char *str_id;
···
 		d = opendir(workdir);
 		if (d) {
 			while ((dir = readdir(d)) != NULL) {
-				if (!match_sysfs_device(dev_id, workdir, dir))
+				if (!match_sysfs_device(hid, workdir, dir))
 					continue;
 
-				str_id = dir->d_name + sizeof("0003:0001:0A37.");
+				str_id = dir->d_name + sizeof("0000:0000:0000.");
 				found = (int)strtol(str_id, NULL, 16);
 
 				break;
···
 	return found;
 }
 
-static int get_hidraw(int dev_id)
+static int get_hidraw(struct uhid_device *hid)
 {
 	const char *workdir = "/sys/devices/virtual/misc/uhid";
 	char sysfs[1024];
···
 			continue;
 
 		while ((dir = readdir(d)) != NULL) {
-			if (!match_sysfs_device(dev_id, workdir, dir))
+			if (!match_sysfs_device(hid, workdir, dir))
 				continue;
 
 			sprintf(sysfs, "%s/%s/hidraw", workdir, dir->d_name);
···
 	return found;
 }
 
-static int open_hidraw(int dev_id)
+static int open_hidraw(struct uhid_device *hid)
 {
 	int hidraw_number;
 	char hidraw_path[64] = { 0 };
 
-	hidraw_number = get_hidraw(dev_id);
+	hidraw_number = get_hidraw(hid);
 	if (hidraw_number < 0)
 		return hidraw_number;
 
 	/* open hidraw node to check the other side of the pipe */
 	sprintf(hidraw_path, "/dev/hidraw%d", hidraw_number);
 	return open(hidraw_path, O_RDWR | O_NONBLOCK);
+}
+
+static int setup_uhid(struct __test_metadata *_metadata, struct uhid_device *hid,
+		      __u16 bus, __u32 vid, __u32 pid, const __u8 *rdesc, size_t rdesc_size)
+{
+	const char *path = "/dev/uhid";
+	time_t t;
+	int ret;
+
+	/* initialize random number generator */
+	srand((unsigned int)time(&t));
+
+	hid->dev_id = rand() % 1024;
+	hid->bus = bus;
+	hid->vid = vid;
+	hid->pid = pid;
+
+	hid->uhid_fd = open(path, O_RDWR | O_CLOEXEC);
+	ASSERT_GE(hid->uhid_fd, 0) TH_LOG("open uhid-cdev failed; %d", hid->uhid_fd);
+
+	ret = uhid_create(_metadata, hid->uhid_fd, hid->dev_id, bus, vid, pid,
+			  (__u8 *)rdesc, rdesc_size);
+	ASSERT_EQ(0, ret) {
+		TH_LOG("create uhid device failed: %d", ret);
+		close(hid->uhid_fd);
+		return ret;
+	}
+
+	/* locate the uevent file of the created device */
+	hid->hid_id = get_hid_id(hid);
+	ASSERT_GT(hid->hid_id, 0)
+		TH_LOG("Could not locate uhid device id: %d", hid->hid_id);
+
+	ret = uhid_start_listener(_metadata, &hid->tid, hid->uhid_fd);
+	ASSERT_EQ(0, ret) {
+		TH_LOG("could not start udev listener: %d", ret);
+		close(hid->uhid_fd);
+		return ret;
+	}
+
+	return 0;
 }

tools/testing/selftests/hid/hidraw.c

···
 #endif /* HIDIOCREVOKE */
 
 FIXTURE(hidraw) {
-	int dev_id;
-	int uhid_fd;
+	struct uhid_device hid;
 	int hidraw_fd;
-	int hid_id;
-	pthread_t tid;
 };
 static void close_hidraw(FIXTURE_DATA(hidraw) * self)
 {
···
 FIXTURE_TEARDOWN(hidraw) {
 	void *uhid_err;
 
-	uhid_destroy(_metadata, self->uhid_fd);
+	uhid_destroy(_metadata, &self->hid);
 
 	close_hidraw(self);
-	pthread_join(self->tid, &uhid_err);
+	pthread_join(self->hid.tid, &uhid_err);
 }
 #define TEARDOWN_LOG(fmt, ...) do { \
 	TH_LOG(fmt, ##__VA_ARGS__); \
···
 
 FIXTURE_SETUP(hidraw)
 {
-	time_t t;
 	int err;
 
-	/* initialize random number generator */
-	srand((unsigned int)time(&t));
+	err = setup_uhid(_metadata, &self->hid, BUS_USB, 0x0001, 0x0a37, rdesc, sizeof(rdesc));
+	ASSERT_OK(err);
 
-	self->dev_id = rand() % 1024;
-
-	self->uhid_fd = setup_uhid(_metadata, self->dev_id);
-
-	/* locate the uev, self, variant);ent file of the created device */
-	self->hid_id = get_hid_id(self->dev_id);
-	ASSERT_GT(self->hid_id, 0)
-		TEARDOWN_LOG("Could not locate uhid device id: %d", self->hid_id);
-
-	err = uhid_start_listener(_metadata, &self->tid, self->uhid_fd);
-	ASSERT_EQ(0, err) TEARDOWN_LOG("could not start udev listener: %d", err);
-
-	self->hidraw_fd = open_hidraw(self->dev_id);
+	self->hidraw_fd = open_hidraw(&self->hid);
 	ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
 }
 
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* inject one other event */
 	buf[0] = 1;
 	buf[1] = 43;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	/* read the data from hidraw */
 	memset(buf, 0, sizeof(buf));
···
 	/* inject one event */
 	buf[0] = 1;
 	buf[1] = 42;
-	uhid_send_event(_metadata, self->uhid_fd, buf, 6);
+	uhid_send_event(_metadata, &self->hid, buf, 6);
 
 	while (true) {
 		ready = poll(pfds, 1, 5000);

tools/testing/selftests/hid/progs/hid.c

···
 struct hid_bpf_ops test_infinite_loop_input_report = {
 	.hid_device_event = (void *)hid_test_infinite_loop_input_report,
 };
+
+SEC("?struct_ops.s/hid_rdesc_fixup")
+int BPF_PROG(hid_test_driver_probe, struct hid_bpf_ctx *hid_ctx)
+{
+	hid_ctx->hid->quirks |= HID_QUIRK_IGNORE_SPECIAL_DRIVER;
+	return 0;
+}
+
+SEC(".struct_ops.link")
+struct hid_bpf_ops test_driver_probe = {
+	.hid_rdesc_fixup = (void *)hid_test_driver_probe,
+};

tools/testing/selftests/hid/progs/hid_bpf_helpers.h

···
 	struct hid_device *hdev;
 };
 
+#define BIT(n) (1U << n)
+
 #ifndef BPF_F_BEFORE
-#define BPF_F_BEFORE (1U << 3)
+#define BPF_F_BEFORE BIT(3)
 #endif
+
+#define HID_QUIRK_IGNORE_SPECIAL_DRIVER		BIT(22)
 
 /* following are kfuncs exported by HID for HID-BPF */
 extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,