HID: corsair-void: Add Corsair Void headset family driver

Introduce a driver for the Corsair Void family of headsets, supporting:
 - Battery reporting (power_supply)
 - Sidetone setting support
 - Physical microphone location reporting
 - Headset and receiver firmware version reporting
 - Built-in alert triggering
 - USB wireless_status

Tested with a Void Pro Wireless, Void Elite Wireless and a Void Elite Wired

Signed-off-by: Stuart Hayhurst <stuart.a.hayhurst@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

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

@@ -0,0 +1,38 @@
+What:		/sys/bus/hid/drivers/hid-corsair-void/<dev>/fw_version_headset
+Date:		January 2024
+KernelVersion:	6.13
+Contact:	Stuart Hayhurst <stuart.a.hayhurst@gmail.com>
+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 <stuart.a.hayhurst@gmail.com>
+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 <stuart.a.hayhurst@gmail.com>
+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 <stuart.a.hayhurst@gmail.com>
+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 <stuart.a.hayhurst@gmail.com>
+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 <stuart.a.hayhurst@gmail.com>
+Description:	(R) Report the maximum sidetone volume

drivers/hid/Kconfig

@@ -213,13 +213,16 @@ config HID_CHICONY
 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"

drivers/hid/Makefile

@@ -38,7 +38,7 @@ obj-$(CONFIG_HID_BIGBEN_FF)	+= hid-bigbenff.o
 obj-$(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