This is a basic sanity test of the backlight sysfs interface.
v2:
- Add jani's suggestion for immediate readback
- Remove unused parameter from test_and_verify()
- Add fade test
Issue: VIZ-3377
Signed-off-by: Antti Koskipaa <antti.koskipaa@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
