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    Subject[PATCH 5.13 234/800] HID: hid-input: add Surface Go battery quirk
    Date
    From: Zoltan Tamas Vajda <zoltan.tamas.vajda@gmail.com>

    [ Upstream commit b5539722eb832441f309642fe5102cc3536f92b8 ]

    The Elantech touchscreen/digitizer in the Surface Go mistakenly reports
    having a battery. This results in a low battery message every time you
    try to use the pen.

    This patch adds a quirk to ignore the non-existent battery and
    gets rid of the false low battery messages.

    Signed-off-by: Zoltan Tamas Vajda <zoltan.tamas.vajda@gmail.com>
    Signed-off-by: Jiri Kosina <jkosina@suse.cz>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 b84a0a11e05b..63ca5959dc67 100644
    --- a/drivers/hid/hid-ids.h
    +++ b/drivers/hid/hid-ids.h
    @@ -396,6 +396,7 @@
    #define USB_DEVICE_ID_HP_X2_10_COVER 0x0755
    #define I2C_DEVICE_ID_HP_SPECTRE_X360_15 0x2817
    #define USB_DEVICE_ID_ASUS_UX550_TOUCHSCREEN 0x2706
    +#define I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN 0x261A

    #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 abbfa91e73e4..68c8644234a4 100644
    --- a/drivers/hid/hid-input.c
    +++ b/drivers/hid/hid-input.c
    @@ -326,6 +326,8 @@ static const struct hid_device_id hid_battery_quirks[] = {
    HID_BATTERY_QUIRK_IGNORE },
    { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_HP_SPECTRE_X360_15),
    HID_BATTERY_QUIRK_IGNORE },
    + { HID_I2C_DEVICE(USB_VENDOR_ID_ELAN, I2C_DEVICE_ID_SURFACE_GO_TOUCHSCREEN),
    + HID_BATTERY_QUIRK_IGNORE },
    {}
    };

    --
    2.30.2


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