On Tue, Nov 02, 2021 at 11:55:04PM +0100, Hans de Goede wrote: > The Xiaomi Mi Pad 2 tablet uses an ACPI enumerated LP8556 backlight > controller for its LCD-panel, with a Xiaomi specific ACPI HID of > "XMCC0001", add support for this. > > Note the new "if (id)" check also fixes a NULL pointer deref when a user > tries to manually bind the driver from sysfs. > > When CONFIG_ACPI is disabled acpi_match_device() will always return NULL, > so the lp855x_parse_acpi() call will get optimized away. > > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Reviewed-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx> Daniel.
