gp2y0a: renamed from gp2y0a21yk to indicate support for the gp2y0a family
Additionally, add some error checking in the constructor, and determine
the ADC resolution and use that in the voltage calculation rather than
a hardcoded 1024.0.
Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>