linux-kernel - [PATCH v3 1/2] HID: input: do not query XP-PEN Deco LW battery

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Date:   Sat, 29 Oct 2022 18:12:39 +0200
From:   José Expósito <jose.exposito89@...il.com>
To:     jikos@...nel.org
Cc:     benjamin.tissoires@...hat.com, spbnick@...il.com,
        pobrn@...tonmail.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        José Expósito <jose.exposito89@...il.com>,
        Mia Kanashi <chad@...pilled.dev>
Subject: [PATCH v3 1/2] HID: input: do not query XP-PEN Deco LW battery

The XP-PEN Deco LW drawing tablet can be connected by USB cable or using
a USB Bluetooth dongle. When it is connected using the dongle, there
might be a small delay until the tablet is paired with the dongle.

Fetching the device battery during this delay results in random battery
percentage values.

Add a quirk to avoid actively querying the battery percentage and wait
for the device to report it on its own.

Reported-by: Mia Kanashi <chad@...pilled.dev>
Signed-off-by: José Expósito <jose.exposito89@...il.com>
---
 drivers/hid/hid-input.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 859aeb07542e..d728a94c642e 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -340,6 +340,7 @@ static enum power_supply_property hidinput_battery_props[] = {
 #define HID_BATTERY_QUIRK_PERCENT	(1 << 0) /* always reports percent */
 #define HID_BATTERY_QUIRK_FEATURE	(1 << 1) /* ask for feature report */
 #define HID_BATTERY_QUIRK_IGNORE	(1 << 2) /* completely ignore the battery */
+#define HID_BATTERY_QUIRK_AVOID_QUERY	(1 << 3) /* do not query the battery */
 
 static const struct hid_device_id hid_battery_quirks[] = {
 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_APPLE,
@@ -373,6 +374,8 @@ static const struct hid_device_id hid_battery_quirks[] = {
 	  HID_BATTERY_QUIRK_IGNORE },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ASUS_UX550VE_TOUCHSCREEN),
 	  HID_BATTERY_QUIRK_IGNORE },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE, USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO_L),
+	  HID_BATTERY_QUIRK_AVOID_QUERY },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_15),
 	  HID_BATTERY_QUIRK_IGNORE },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_ENVY_X360_15T_DR100),
@@ -554,6 +557,9 @@ static int hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 	dev->battery_avoid_query = report_type == HID_INPUT_REPORT &&
 				   field->physical == HID_DG_STYLUS;
 
+	if (quirks & HID_BATTERY_QUIRK_AVOID_QUERY)
+		dev->battery_avoid_query = true;
+
 	dev->battery = power_supply_register(&dev->dev, psy_desc, &psy_cfg);
 	if (IS_ERR(dev->battery)) {
 		error = PTR_ERR(dev->battery);
-- 
2.25.1