[PATCH] Rewritten backlight infrastructure for portable Apple computers

[PATCH] Rewritten backlight infrastructure for portable Apple computers

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]>