[PATCH] HID: Ignore battery for Elan touchscreen on HP Envy X360 15t-dr100

[Karl Kurbjun <kkurbjun@gmail.com>]

Battery status on Elan tablet driver is reported for the HP ENVY x360
15t-dr100. There is no separate battery for the Elan controller resulting
in a battery level report of 0% or 1% depending on whether a stylus has
interacted with the screen. These low battery level reports causes a
variety of bad behavior in desktop environments. This patch adds the
appropriate quirk to indicate that the batery status is unused for this
target.

Signed-off-by: Karl Kurbjun <kkurbjun@gmail.com>
---
 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 19da07777d62..a5a5a64c7abc 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -398,6 +398,7 @@
 #define USB_DEVICE_ID_HP_X2		0x074d
 #define USB_DEVICE_ID_HP_X2_10_COVER	0x0755
 #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 USB_DEVICE_ID_ASUS_UX550VE_TOUCHSCREEN	0x2544
 #define USB_DEVICE_ID_ASUS_UX550_TOUCHSCREEN	0x2706
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 03f994541981..ca47682cc730 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -329,6 +329,8 @@ static const struct hid_device_id hid_battery_quirks[] = {
 	  HID_BATTERY_QUIRK_IGNORE },
 	{ 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),
+	  HID_BATTERY_QUIRK_IGNORE },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_SPECTRE_X360_15),
 	  HID_BATTERY_QUIRK_IGNORE },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN),
-- 
2.34.1