3 Nov
2021
3 Nov
'21
5:17 p.m.
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@redhat.com
Reviewed-by: Daniel Thompson daniel.thompson@linaro.org
Daniel.