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| author | Corentin Chary <corentincj@iksaif.net> | 2009-08-28 12:56:43 +0000 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-08-28 15:21:12 -0400 |
| commit | 3c4c1b69a2d76ac9a1c716233fde956dba757d76 (patch) | |
| tree | 2a298c158a3f51af9c550bc0d8353ec8e7085ceb | |
| parent | d0a6825c9217cfc52d39b2b2bedd73bef8019f79 (diff) | |
| download | lwn-3c4c1b69a2d76ac9a1c716233fde956dba757d76.tar.gz lwn-3c4c1b69a2d76ac9a1c716233fde956dba757d76.zip | |
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>
| -rw-r--r-- | Documentation/ABI/stable/sysfs-class-backlight | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-class-backlight b/Documentation/ABI/stable/sysfs-class-backlight new file mode 100644 index 000000000000..4d637e1c4ff7 --- /dev/null +++ b/Documentation/ABI/stable/sysfs-class-backlight @@ -0,0 +1,36 @@ +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 + +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 + +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 + +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 |