HID: asus: support Republic of Gamers special keys

Add support for the special keys found on the internal keyboard of the
Asus Republic of Gamers (ROG) laptop models GL553VD, GL553VE, GL753VD
and GL753VE.
Signed-off-by: Chris Chiu <chiu@endlessm.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

@@ -137,11 +137,14 @@ config HID_APPLEIR
 config HID_ASUS
 	tristate "Asus"
 	---help---
-	Support for Asus notebook built-in keyboard and touchpad via i2c.
+	Support for Asus notebook built-in keyboard and touchpad via i2c, and
+	the Asus Republic of Gamers laptop keyboard special keys.
 
 	Supported devices:
 	- EeeBook X205TA
 	- VivoBook E200HA
+	- GL553V series
+	- GL753V series
 
 config HID_AUREAL
 	tristate "Aureal"

drivers/hid/hid-asus.c

@@ -199,6 +199,8 @@ static int asus_input_configured(struct hid_device *hdev, struct hid_input *hi)
 	return 0;
 }
 
+#define rog_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, \
+						    max, EV_KEY, (c))
 static int asus_input_mapping(struct hid_device *hdev,
 		struct hid_input *hi, struct hid_field *field,
 		struct hid_usage *usage, unsigned long **bit,
@@ -213,6 +215,38 @@ static int asus_input_mapping(struct hid_device *hdev,
 		return -1;
 	}
 
+	/* ASUS Republic of Gamers laptop keyboard hotkeys */
+	if ((usage->hid & HID_USAGE_PAGE) == 0xff310000) {
+		set_bit(EV_REP, hi->input->evbit);
+		switch (usage->hid & HID_USAGE) {
+		case 0x10: rog_map_key_clear(KEY_BRIGHTNESSDOWN);	break;
+		case 0x20: rog_map_key_clear(KEY_BRIGHTNESSUP);		break;
+		case 0x35: rog_map_key_clear(KEY_DISPLAY_OFF);		break;
+		case 0x6c: rog_map_key_clear(KEY_SLEEP);		break;
+		case 0x82: rog_map_key_clear(KEY_CAMERA);		break;
+		case 0x88: rog_map_key_clear(KEY_WLAN);			break;
+		case 0xb5: rog_map_key_clear(KEY_CALC);			break;
+		case 0xc4: rog_map_key_clear(KEY_KBDILLUMUP);		break;
+		case 0xc5: rog_map_key_clear(KEY_KBDILLUMDOWN);		break;
+
+		/* ASUS touchpad toggle */
+		case 0x6b: rog_map_key_clear(KEY_F21);			break;
+
+		/* ROG key */
+		case 0x38: rog_map_key_clear(KEY_PROG1);		break;
+
+		/* Fn+C ASUS Splendid */
+		case 0xba: rog_map_key_clear(KEY_PROG2);		break;
+
+		/* Fn+Space Power4Gear Hybrid */
+		case 0x5c: rog_map_key_clear(KEY_PROG3);		break;
+
+		default:
+			return 0;
+		}
+		return 1;
+	}
+
 	return 0;
 }
 
@@ -323,6 +357,10 @@ static const struct hid_device_id asus_devices[] = {
 		 USB_DEVICE_ID_ASUSTEK_NOTEBOOK_KEYBOARD), KEYBOARD_QUIRKS},
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ASUSTEK,
 			 USB_DEVICE_ID_ASUSTEK_TOUCHPAD), TOUCHPAD_QUIRKS },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,
+		USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD1) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,
+		USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD2) },
 	{ }
 };
 MODULE_DEVICE_TABLE(hid, asus_devices);

drivers/hid/hid-core.c

@@ -1854,6 +1854,8 @@ static const struct hid_device_id hid_have_special_driver[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_GEYSER1_TP_ONLY) },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ASUSTEK, USB_DEVICE_ID_ASUSTEK_NOTEBOOK_KEYBOARD) },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ASUSTEK, USB_DEVICE_ID_ASUSTEK_TOUCHPAD) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK, USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD1) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK, USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD2) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_AUREAL, USB_DEVICE_ID_AUREAL_W01RN) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_BELKIN, USB_DEVICE_ID_FLIP_KVM) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185BFM, 0x2208) },

drivers/hid/hid-ids.h

@@ -175,6 +175,8 @@
 #define USB_DEVICE_ID_ASUSTEK_LCM2	0x175b
 #define USB_DEVICE_ID_ASUSTEK_NOTEBOOK_KEYBOARD	0x8585
 #define USB_DEVICE_ID_ASUSTEK_TOUCHPAD	0x0101
+#define USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD1 0x1854
+#define USB_DEVICE_ID_ASUSTEK_ROG_KEYBOARD2 0x1837
 
 #define USB_VENDOR_ID_ATEN		0x0557
 #define USB_DEVICE_ID_ATEN_UC100KM	0x2004