linux-kernel - [PATCH] HID: Ignore battery for Elan touchscreen on Asus TP420IA

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Date:   Tue, 10 Jan 2023 15:54:26 +0100 (CET)
From:   marco.rodolfi@...a.io
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Linux Input <linux-input@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Cc:     Marco Rodolfi <marco.rodolfi@...a.io>
Subject: [PATCH] HID: Ignore battery for Elan touchscreen on Asus TP420IA


This device has a touchscreen thats report a battery even if it doesn't 
have one. 
Ask Linux to ignore the battery so it will not always report it as low. 
 
Signed-off-by: Marco Rodolfi <marco.rodolfi@...a.io> 
--- 
 drivers/hid/hid-ids.h   | 1 + 
 drivers/hid/hid-input.c | 2 ++ 
 2 files changed, 3 insertions(+) 
 
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h 
index 8f58c3c1bec3..0f525b946cd1 100644 
--- a/drivers/hid/hid-ids.h 
+++ b/drivers/hid/hid-ids.h 
@@ -413,6 +413,7 @@ 
 #define I2C_DEVICE_ID_HP_ENVY_X360_15  0x2d05 
 #define I2C_DEVICE_ID_HP_ENVY_X360_15T_DR100   0x29CF 
 #define I2C_DEVICE_ID_HP_SPECTRE_X360_15       0x2817 
+#define I2C_DEVICE_ID_ASUS_TP420IA_TOUCHSCREEN 0x2BC8 
 #define USB_DEVICE_ID_ASUS_UX550VE_TOUCHSCREEN 0x2544 
 #define USB_DEVICE_ID_ASUS_UX550_TOUCHSCREEN   0x2706 
 #define I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN   0x261A 
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c 
index 859aeb07542e..54e2d4066d9b 100644 
--- a/drivers/hid/hid-input.c 
+++ b/drivers/hid/hid-input.c 
@@ -369,6 +369,8 @@ static const struct hid_device_id hid_battery_quirks[] = { 
        { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LOGITECH, 
                USB_DEVICE_ID_LOGITECH_DINOVO_EDGE_KBD), 
          HID_BATTERY_QUIRK_IGNORE }, 
+       { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_ASUS_TP420IA_TOUCHSCREEN)
, 
+         HID_BATTERY_QUIRK_IGNORE }, 
        { HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550_TOUCHSCREEN), 
          HID_BATTERY_QUIRK_IGNORE }, 
        { HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550VE_TOUCHSCREEN)
, 
--  
2.39.0