[PATCH v5 11/11] HID: asus: initialize LED endpoint early for old NKEY keyboards

[Antheas Kapenekakis <lkml@antheas.dev>]

These keyboards have always had initialization in the kernel for 0x5d.
At this point, it is hard to verify again and we risk regressions by
removing this. Therefore, initialize with 0x5d, and skip RGB
initialization if that is enabled.

Signed-off-by: Antheas Kapenekakis <lkml@antheas.dev>
---
 drivers/hid/hid-asus.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index fa8ec237efe26..d02d0629d03cd 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -90,6 +90,7 @@ MODULE_DESCRIPTION("Asus HID Keyboard and TouchPad");
 #define QUIRK_ROG_CLAYMORE_II_KEYBOARD BIT(12)
 #define QUIRK_HANDLE_GENERIC		BIT(13)
 #define QUIRK_ROG_NKEY_RGB		BIT(14)
+#define QUIRK_ROG_NKEY_LEGACY		BIT(15)
 
 #define I2C_KEYBOARD_QUIRKS			(QUIRK_FIX_NOTEBOOK_REPORT | \
 						 QUIRK_NO_INIT_REPORTS | \
@@ -647,12 +648,25 @@ static int asus_kbd_register_leds(struct hid_device *hdev)
 	struct asus_drvdata *drvdata = hid_get_drvdata(hdev);
 	unsigned char kbd_func;
 	struct asus_kbd_leds *leds;
+	bool rgb_init = true;
 	int ret;
 
 	ret = asus_kbd_init(hdev, FEATURE_KBD_REPORT_ID);
 	if (ret < 0)
 		return ret;
 
+	if (drvdata->quirks & QUIRK_ROG_NKEY_LEGACY) {
+		/*
+		 * These keyboards might need 0x5d for shortcuts to work.
+		 * As it has been more than 5 years, it is hard to verify.
+		 */
+		ret = asus_kbd_init(hdev, FEATURE_KBD_LED_REPORT_ID1);
+		if (ret < 0)
+			return ret;
+
+		rgb_init = false;
+	}
+
 	/* Get keyboard functions */
 	ret = asus_kbd_get_functions(hdev, &kbd_func, FEATURE_KBD_REPORT_ID);
 	if (ret < 0)
@@ -683,7 +697,7 @@ static int asus_kbd_register_leds(struct hid_device *hdev)
 	leds->rgb_colors[0] = 0;
 	leds->rgb_colors[1] = 0;
 	leds->rgb_colors[2] = 0;
-	leds->rgb_init = true;
+	leds->rgb_init = rgb_init;
 	leds->rgb_set = false;
 	leds->mc_led.led_cdev.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 					"asus-%s:rgb:peripheral",
@@ -1415,10 +1429,10 @@ static const struct hid_device_id asus_devices[] = {
 	  QUIRK_USE_KBD_BACKLIGHT },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,
 	    USB_DEVICE_ID_ASUSTEK_ROG_NKEY_KEYBOARD),
-	  QUIRK_USE_KBD_BACKLIGHT | QUIRK_ROG_NKEY_KEYBOARD },
+	  QUIRK_USE_KBD_BACKLIGHT | QUIRK_ROG_NKEY_KEYBOARD | QUIRK_ROG_NKEY_LEGACY },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,
 	    USB_DEVICE_ID_ASUSTEK_ROG_NKEY_KEYBOARD2),
-	  QUIRK_USE_KBD_BACKLIGHT | QUIRK_ROG_NKEY_KEYBOARD },
+	  QUIRK_USE_KBD_BACKLIGHT | QUIRK_ROG_NKEY_KEYBOARD | QUIRK_ROG_NKEY_LEGACY },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ASUSTEK,
 	    USB_DEVICE_ID_ASUSTEK_ROG_Z13_LIGHTBAR),
 	  QUIRK_USE_KBD_BACKLIGHT | QUIRK_ROG_NKEY_KEYBOARD | QUIRK_ROG_NKEY_RGB },
-- 
2.49.0