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This patch contains a total rewrite of the backlight infrastructure for portable Apple computers. Backward compatibility is retained. A sysfs interface allows userland to control the brightness with more steps than before. Userland is allowed to upload a brightness curve for different monitors, similar to Mac OS X. [[email protected]: add needed exports] Signed-off-by: Michael Hanselmann <[email protected]> Acked-by: Benjamin Herrenschmidt <[email protected]> Cc: Richard Purdie <[email protected]> Cc: "Antonino A. Daplas" <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>