backlight: Add Nvidia-based Apple Macbook Pro backlight driver
Nvidia-based Apple Macbook Pros don't appear to handle backlight control through the graphics card registers or ACPI, but instead trigger changes via SMI calls. This driver registers a generic backlight device that lets existing userspace deal with it. Code derived from Julien Blache's Pommed application. Signed-off-by: NJulien Blache <jb@jblache.org> Signed-off-by: NMatthew Garrett <mjg@redhat.com> Signed-off-by: NRichard Purdie <rpurdie@rpsys.net>
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