[PATCH v3 2/3] platform/x86: asus-wmi: enable TUF RGB state for FA401 via DMI quirk

[Idotoho Reimon Simanjuntak <idotohors@gmail.com>]

The FA401 (TUF Gaming A14) series does not expose the TUF RGB state
WMI device (0x00100057) through the standard DSTS probe, yet the EC
does support the keyboard backlight power-state flags needed for sleep
strobe functionality.

Add a DMI-based quirk in asus-nb-wmi.c that matches on DMI_SYS_VENDOR
"ASUSTeK COMPUTER INC." and DMI_BOARD_NAME "FA401", setting
kbd_rgb_state_available = true in struct quirk_entry.

In asus_wmi_add(), change the kbd_rgb_state_available assignment to
also consider driver->quirks->kbd_rgb_state_available, so models with
this quirk get the RGB state sysfs attributes even when DSTS probing
fails.

No PM/sleep/backlight changes are included in this commit; those will
be addressed separately once the RGB state interface is available.

Signed-off-by: Idotoho Reimon Simanjuntak <idotohors@gmail.com>
---
 drivers/platform/x86/asus-nb-wmi.c | 13 +++++++++++++
 drivers/platform/x86/asus-wmi.c    |  4 +++-
 drivers/platform/x86/asus-wmi.h    |  1 +
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/asus-nb-wmi.c b/drivers/platform/x86/asus-nb-wmi.c
index aeb461b16..47ceb6e46 100644
--- a/drivers/platform/x86/asus-nb-wmi.c
+++ b/drivers/platform/x86/asus-nb-wmi.c
@@ -155,6 +155,10 @@ static struct quirk_entry quirk_asus_z13 = {
 	.tablet_switch_mode = asus_wmi_kbd_dock_devid,
 };
 
+static struct quirk_entry quirk_asus_fa401 = {
+	.kbd_rgb_state_available = true,
+};
+
 static int dmi_matched(const struct dmi_system_id *dmi)
 {
 	pr_info("Identified laptop model '%s'\n", dmi->ident);
@@ -562,6 +566,15 @@ static const struct dmi_system_id asus_quirks[] = {
 		},
 		.driver_data = &quirk_asus_z13,
 	},
+	{
+		.callback = dmi_matched,
+		.ident = "ASUSTeK COMPUTER INC. FA401",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_MATCH(DMI_BOARD_NAME, "FA401"),
+		},
+		.driver_data = &quirk_asus_fa401,
+	},
 	{},
 };
 
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index efc730c2c..e7b2402c9 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -5181,7 +5181,9 @@ static int asus_wmi_add(struct platform_device *pdev)
 
 	asus->egpu_enable_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_EGPU);
 	asus->dgpu_disable_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_DGPU);
-	asus->kbd_rgb_state_available = asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_TUF_RGB_STATE);
+	asus->kbd_rgb_state_available =
+		asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_TUF_RGB_STATE) ||
+		asus->driver->quirks->kbd_rgb_state_available;
 
 	if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_MINI_LED_MODE))
 		asus->mini_led_dev_id = ASUS_WMI_DEVID_MINI_LED_MODE;
diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
index 5cd4392b9..9bc0b6145 100644
--- a/drivers/platform/x86/asus-wmi.h
+++ b/drivers/platform/x86/asus-wmi.h
@@ -52,6 +52,7 @@ struct quirk_entry {
 	 */
 	int no_display_toggle;
 	u32 xusb2pr;
+	bool kbd_rgb_state_available;
 };
 
 struct asus_wmi_driver {
-- 
2.55.0