Add integer menu control for exposure bias. The control value range is
-2.0 EV to +2.0 EV, in 0.5 EV steps.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>