gamma control: WIP expose gamma parameters to sysfs interface

Signed-off-by: faux123 <reioux@gmail.com>
gamma control: fix wip code derps :p

Signed-off-by: faux123 <reioux@gmail.com>
gamma control: add checksum to validate data integrity

Signed-off-by: faux123 <reioux@gmail.com>
gamma control: fix typo derp :(

Signed-off-by: faux123 <reioux@gmail.com>