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There may be multiple ways of controlling the backlight on a given machine. Allow drivers to expose the type of interface they are providing, making it possible for userspace to make appropriate policy decisions. Signed-off-by: Matthew Garrett <[email protected]> Cc: Richard Purdie <[email protected]> Cc: Chris Wilson <[email protected]> Cc: David Airlie <[email protected]> Cc: Alex Deucher <[email protected]> Cc: Ben Skeggs <[email protected]> Cc: Zhang Rui <[email protected]> Cc: Len Brown <[email protected]> Cc: Jesse Barnes <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>