Re: [PATCH v2 1/3] backlight: introduce backlight_device_registered

On Tue, 2013-09-17 at 17:23 +0800, Aaron Lu wrote:

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 register its own on Win8 systems).

Signed-off-by: Aaron Lu aaron.lu@intel.com

Tested-by: Igor Gnatenko i.gnatenko.brain@gmail.com

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drivers/video/backlight/backlight.c | 31 +++++++++++++++++++++++++++++++ include/linux/backlight.h | 4 ++++ 2 files changed, 35 insertions(+)