tree d3f56cdf916f71ac50789abf511ee16b6bc55fe6
parent 068aab7766cf968a8ddb86a6d7c6bbed9d61e353
author Aaron Lu <aaron.lu@intel.com> 1381498063 +0800
committer Rafael J. Wysocki <rafael.j.wysocki@intel.com> 1381878964 +0200

backlight: introduce backlight_device_registered

Introduce a new API for modules to query if a specific type of backlight
device has been registered. This is useful for some backlight device
provider module (e.g. ACPI video) to know if a native control
interface(e.g. the interface created by i915) is available and then do
things accordingly (e.g. avoid registering its own on Win8 systems).

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>