HID: hid-steam: Add Steam Deck support

Add preliminary support for the Steam Deck's controller interface. Currently,
this only supports the controller inputs and toggling lizard mode (Valve's name
for a hardware kb/m emulation mode). It does not support any of the advanced
features, such as the motion sensors or force-feedback.

The Steam Deck also includes a heartbeat for lizard mode that switches it back
on if no reports have been received within a few milliseconds. The official
Steam client handles this by sending a handful of configuration reports every
few ms, so we copy this behavior by sending configuration reports to disable
the mouse and reset the digital mappings every 5ms. As this isn't needed for
the older Steam Controller, this is only done on the Steam Deck.

Signed-off-by: Vicki Pfau <[email protected]>
Reviewed-by: Lyude Paul <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Benjamin Tissoires <[email protected]>

Author: endrift

drivers/hid/Kconfig

@@ -1018,10 +1018,10 @@ config HID_SPEEDLINK
 	Support for Speedlink Vicious and Divine Cezanne mouse.
 
 config HID_STEAM
-	tristate "Steam Controller support"
+	tristate "Steam Controller/Deck support"
 	select POWER_SUPPLY
 	help
-	Say Y here if you have a Steam Controller if you want to use it
+	Say Y here if you have a Steam Controller or Deck if you want to use it
 	without running the Steam Client. It supports both the wired and
 	the wireless adaptor.
 

drivers/hid/hid-ids.h

@@ -1182,6 +1182,7 @@
 #define USB_VENDOR_ID_VALVE			0x28de
 #define USB_DEVICE_ID_STEAM_CONTROLLER		0x1102
 #define USB_DEVICE_ID_STEAM_CONTROLLER_WIRELESS	0x1142
+#define USB_DEVICE_ID_STEAM_DECK	0x1205
 
 #define USB_VENDOR_ID_STEELSERIES	0x1038
 #define USB_DEVICE_ID_STEELSERIES_SRWS1	0x1410