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video/backlight: document sysfs interface
Date and KernelVersion may be wrong because the backlight interface was introduced before git initial import. Cc:Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Len Brown <len.brown@intel.com>
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What: /sys/class/backlight/<backlight>/bl_power | ||
Date: April 2005 | ||
KernelVersion: 2.6.12 | ||
Contact: Richard Purdie <rpurdie@rpsys.net> | ||
Description: | ||
Control BACKLIGHT power, values are FB_BLANK_* from fb.h | ||
- FB_BLANK_UNBLANK (0) : power on. | ||
- FB_BLANK_POWERDOWN (4) : power off | ||
Users: HAL | ||
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What: /sys/class/backlight/<backlight>/brightness | ||
Date: April 2005 | ||
KernelVersion: 2.6.12 | ||
Contact: Richard Purdie <rpurdie@rpsys.net> | ||
Description: | ||
Control the brightness for this <backlight>. Values | ||
are between 0 and max_brightness. This file will also | ||
show the brightness level stored in the driver, which | ||
may not be the actual brightness (see actual_brightness). | ||
Users: HAL | ||
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What: /sys/class/backlight/<backlight>/actual_brightness | ||
Date: March 2006 | ||
KernelVersion: 2.6.17 | ||
Contact: Richard Purdie <rpurdie@rpsys.net> | ||
Description: | ||
Show the actual brightness by querying the hardware. | ||
Users: HAL | ||
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What: /sys/class/backlight/<backlight>/max_brightness | ||
Date: April 2005 | ||
KernelVersion: 2.6.12 | ||
Contact: Richard Purdie <rpurdie@rpsys.net> | ||
Description: | ||
Maximum brightness for <backlight>. | ||
Users: HAL |