[PATCH v5 2/4] HID: asus: Filter spurious HID vendor codes on ROG laptops

["Ionut Nechita (Sunlight Linux)" <sunlightlinux@gmail.com>]

From: Ionut Nechita <ionut_n2001@yahoo.com>

On Asus ROG laptops, several HID vendor usage codes (0xea, 0xec, 0x02,
0x8a, 0x9e) are sent during normal operation without a clear purpose,
generating unwanted "Unmapped Asus vendor usagepage code" warnings in
dmesg.

Add definitions for these codes and filter them out in asus_raw_event()
to prevent kernel log spam.

Tested on Asus ROG series laptops.

Reviewed-by: Denis Benato <benato.denis96@gmail.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Ionut Nechita <ionut_n2001@yahoo.com>
---
 drivers/hid/hid-asus.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index eb14b9d13823b..15c24d5812763 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -57,6 +57,13 @@ MODULE_DESCRIPTION("Asus HID Keyboard and TouchPad");
 #define ROG_ALLY_X_MIN_MCU 313
 #define ROG_ALLY_MIN_MCU 319
 
+/* Spurious HID codes sent by QUIRK_ROG_NKEY_KEYBOARD devices */
+#define ASUS_SPURIOUS_CODE_0XEA 0xea
+#define ASUS_SPURIOUS_CODE_0XEC 0xec
+#define ASUS_SPURIOUS_CODE_0X02 0x02
+#define ASUS_SPURIOUS_CODE_0X8A 0x8a
+#define ASUS_SPURIOUS_CODE_0X9E 0x9e
+
 #define SUPPORT_KBD_BACKLIGHT BIT(0)
 
 #define MAX_TOUCH_MAJOR 8
@@ -348,6 +355,21 @@ static int asus_raw_event(struct hid_device *hdev,
 	if (report->id == FEATURE_KBD_LED_REPORT_ID1 || report->id == FEATURE_KBD_LED_REPORT_ID2)
 		return -1;
 	if (drvdata->quirks & QUIRK_ROG_NKEY_KEYBOARD) {
+		/*
+		 * ASUS ROG laptops send these codes during normal operation
+		 * with no discernable reason. Filter them out to avoid
+		 * unmapped warning messages.
+		 */
+		if (report->id == FEATURE_KBD_REPORT_ID) {
+			if (data[1] == ASUS_SPURIOUS_CODE_0XEA ||
+			    data[1] == ASUS_SPURIOUS_CODE_0XEC ||
+			    data[1] == ASUS_SPURIOUS_CODE_0X02 ||
+			    data[1] == ASUS_SPURIOUS_CODE_0X8A ||
+			    data[1] == ASUS_SPURIOUS_CODE_0X9E) {
+				return -1;
+			}
+		}
+
 		/*
 		 * G713 and G733 send these codes on some keypresses, depending on
 		 * the key pressed it can trigger a shutdown event if not caught.
-- 
2.52.0