Allow manual PWM control on Dell Latitude E7440.
Reviewed-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20210411095741.zmllsuc7pevdipvy@icloud.comSigned-off-by: Sebastian Oechsle <setboolean@icloud.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>