sm501: add power control callback
Add callback to get or set the power control if the device has the sleep connected to some form of GPIO. Signed-off-by: NBen Dooks <ben-linux@fluff.org> Cc: Arnaud Patard <apatard@mandriva.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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