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Provide a small convenience wrapper that set/get the display brightness.
Cc: John Stultz <john.stultz@linaro.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Archit Taneja <archit.taneja@gmail.com>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Change-Id: I501ffb4b31ab2c8950ed1c4b84fb241d4b6aaae0
Signed-off-by: Wyon Bi <bivvy.bi@rock-chips.com>
(cherry picked from commit 1a9d759331)