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Date: Fri, 23 Feb 2024 15:16:12 -0800
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Jiri Kosina <jikos@kernel.org>,
	Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: kenalba@google.com, dianders@chromium.org, linux-input@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] HID: input: avoid polling stylus battery on Chromebook Pompom
Message-ID: <ZdknA5qa8B-nB6ta@google.com>
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Internal touchscreen on Trogdor Pompom (AKA Dynabook Chromebook C1)
supports USI stylus. Unfortunately the HID descriptor for the stylus
interface does not contain "Stylus" physical collection, which makes
the kernel to try and pull battery information, resulting in errors.

Apply HID_BATTERY_QUIRK_AVOID_QUERY to the device.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@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 e4d2dfd5d253..05f451390a3b 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -426,6 +426,7 @@
 #define I2C_DEVICE_ID_HP_SPECTRE_X360_14T_EA100_V1	0x2BED
 #define I2C_DEVICE_ID_HP_SPECTRE_X360_14T_EA100_V2	0x2BEE
 #define I2C_DEVICE_ID_HP_ENVY_X360_15_EU0556NG		0x2D02
+#define I2C_DEVICE_ID_CHROMEBOOK_TROGDOR_POMPOM	0x2F81
 
 #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 c8b20d44b147..e03d300d2bac 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -411,6 +411,8 @@ 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_EU0556NG),
 	  HID_BATTERY_QUIRK_IGNORE },
+	{ HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_CHROMEBOOK_TROGDOR_POMPOM),
+	  HID_BATTERY_QUIRK_AVOID_QUERY },
 	{}
 };
 
-- 
2.44.0.rc0.258.g7320e95886-goog


-- 
Dmitry