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Buttons that work directly on hardware cannot support the "user_claim" functionality. Add a flag to signal this and return -EOPNOTSUPP in this case. b43 is such a device. Signed-off-by: Michael Buesch <[email protected]> Acked-by: Ivo van Doorn <[email protected]> Signed-off-by: John W. Linville <[email protected]> Signed-off-by: David S. Miller <[email protected]>