linux-kernel - [PATCH] HID: add HP 13t-aw100 & 14t-ea100 digitizer battery quirks

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Date:   Mon, 6 Mar 2023 10:18:36 -0800
From:   Philippe Troin <phil@...i.org>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] HID: add HP 13t-aw100 & 14t-ea100 digitizer battery quirks

Similar to many other devices using the Synopsys Designware Elantech
hardware, HP Spectre x360 13t-aw100 and 14t-ea100 report an empty
battery devices, supposedly for the active stylus.

Apply the HID_BATTERY_QUIRK_IGNORE quirk to ignore the battery reports
from these devices. Note that there are multiple versions of the panel
installed in the 14t-ea100.

Signed-off-by: Philippe Troin <phil@...i.org>
---
 drivers/hid/hid-ids.h   | 3 +++
 drivers/hid/hid-input.c | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 63545cd307e5..22e716b66fb8 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -420,6 +420,9 @@
 #define I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN	0x261A
 #define I2C_DEVICE_ID_SURFACE_GO2_TOUCHSCREEN	0x2A1C
 #define I2C_DEVICE_ID_LENOVO_YOGA_C630_TOUCHSCREEN	0x279F
+#define I2C_DEVICE_ID_HP_SPECTRE_X360_13T_AW100	0x29F5
+#define I2C_DEVICE_ID_HP_SPECTRE_X360_14T_EA100_V1	0x2BED
+#define I2C_DEVICE_ID_HP_SPECTRE_X360_14T_EA100_V2	0x2BEE
 
 #define USB_VENDOR_ID_ELECOM		0x056e
 #define USB_DEVICE_ID_ELECOM_BM084	0x0061
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 7fc967964dd8..5c65a584b3fa 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -398,6 +398,12 @@ static const struct hid_device_id hid_battery_quirks[] = {
 	  HID_BATTERY_QUIRK_IGNORE },
 	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_LENOVO_YOGA_C630_TOUCHSCREEN),
 	  HID_BATTERY_QUIRK_IGNORE },
+	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_SPECTRE_X360_13T_AW100),
+	  HID_BATTERY_QUIRK_IGNORE },
+	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_SPECTRE_X360_14T_EA100_V1),
+	  HID_BATTERY_QUIRK_IGNORE },
+	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_SPECTRE_X360_14T_EA100_V2),
+	  HID_BATTERY_QUIRK_IGNORE },
 	{}
 };
 
-- 
2.39.2