linux-samsung-kminilte: add flashlight support
These changes enable the flashlight LED driver (fled_rt5033), and add support for switching the light on and off from userspace.
In more detail:
CONFIG_FLED_RT5033enables the flashlight driver
CONFIG_VIDEO_EXYNOS_FIMC_ISis required for the flashlight driver to compile (there seems to be a lot of cross-dependency between the two drivers)
- patch 0001 fixes the use of
usleep(which no longer exists), to make the kernel compile with those settings
With these changes,
/sys/class/flashlight/rt-flash-led shows up in
sysfs, but it's only possible to control the brightness of the LED,
not to switch it on.
Patch 0002 is what actually makes the flashlight usable: it makes
/sys/class/flashlight/rt-flash-led/mode file writable.
Writing "Torch" there enables the flashlight, writing "Off" disables it again. "Mixed" mode works like "Torch" as well. I have not figured out yet how to trigger the camera flash, so setting the mode to "Flash" is possible, albeit pointless.
Here's an example of how to use it:
# Read the current mode samsung-kminilte:~# cat /sys/class/flashlight/rt-flash-led/mode Off # Turn it on samsung-kminilte:~# echo Torch > /sys/class/flashlight/rt-flash-led/mode # Set lowest brightness (still pretty bright) samsung-kminilte:~# echo 0 > /sys/class/flashlight/rt-flash-led/torch_brightness # Set highest brightness (shield your eyes) samsung-kminilte:~# echo 15 > /sys/class/flashlight/rt-flash-led/torch_brightness # Turn it off samsung-kminilte:~# echo Off > /sys/class/flashlight/rt-flash-led/mode