input: Add event code for accessibility key

HUTRR116 added support for a new usage titled "System Accessibility
Binding" which toggles a system-wide bound accessibility UI or command.
This commit simply adds a new event code for the usage.

Signed-off-by: Aseda Aboagye <aaboagye@chromium.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/Zl-e97O9nvudco5z@google.com
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>

Author: Aseda Aboagye

drivers/hid/hid-debug.c

@@ -3366,6 +3366,7 @@ static const char *keys[KEY_MAX + 1] = {
 	[KEY_CAMERA_ACCESS_ENABLE] = "CameraAccessEnable",
 	[KEY_CAMERA_ACCESS_DISABLE] = "CameraAccessDisable",
 	[KEY_CAMERA_ACCESS_TOGGLE] = "CameraAccessToggle",
+	[KEY_ACCESSIBILITY] = "Accessibility",
 	[KEY_DICTATE] = "Dictate",
 	[KEY_MICMUTE] = "MicrophoneMute",
 	[KEY_BRIGHTNESS_MIN] = "BrightnessMin",

drivers/hid/hid-input.c

@@ -836,6 +836,7 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 		if ((usage->hid & 0xf0) == 0xa0) {	/* SystemControl */
 			switch (usage->hid & 0xf) {
 			case 0x9: map_key_clear(KEY_MICMUTE); break;
+			case 0xa: map_key_clear(KEY_ACCESSIBILITY); break;
 			default: goto ignore;
 			}
 			break;

include/uapi/linux/input-event-codes.h

@@ -618,6 +618,7 @@
 #define KEY_CAMERA_ACCESS_ENABLE	0x24b	/* Enables programmatic access to camera devices. (HUTRR72) */
 #define KEY_CAMERA_ACCESS_DISABLE	0x24c	/* Disables programmatic access to camera devices. (HUTRR72) */
 #define KEY_CAMERA_ACCESS_TOGGLE	0x24d	/* Toggles the current state of the camera access control. (HUTRR72) */
+#define KEY_ACCESSIBILITY		0x24e	/* Toggles the system bound accessibility UI/command (HUTRR116) */
 
 #define KEY_BRIGHTNESS_MIN		0x250	/* Set Brightness to Minimum */
 #define KEY_BRIGHTNESS_MAX		0x251	/* Set Brightness to Maximum */