When gpios are set to input, we return the input buffer status from the STATUS1 register when the 'get' gpiochip callback is invoked. This register also includes a bit that indicates whether the pin is enabled. Check to verify the pin is enabled, and if it is then return the properly masked 1-bit value. Otherwise return an error, since the API is not valid in this state. Change-Id: I715e17f076d0dbd67397812f98e308f863c59b7c Signed-off-by: Michael Bohan <mbohan@codeaurora.org>