summaryrefslogtreecommitdiffstats
path: root/Documentation/ABI/stable
diff options
context:
space:
mode:
authorCorentin Chary <corentincj@iksaif.net>2009-08-28 12:56:43 +0000
committerLen Brown <len.brown@intel.com>2009-08-28 15:21:12 -0400
commit3c4c1b69a2d76ac9a1c716233fde956dba757d76 (patch)
tree2a298c158a3f51af9c550bc0d8353ec8e7085ceb /Documentation/ABI/stable
parentd0a6825c9217cfc52d39b2b2bedd73bef8019f79 (diff)
downloadop-kernel-dev-3c4c1b69a2d76ac9a1c716233fde956dba757d76.zip
op-kernel-dev-3c4c1b69a2d76ac9a1c716233fde956dba757d76.tar.gz
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>
Diffstat (limited to 'Documentation/ABI/stable')
-rw-r--r--Documentation/ABI/stable/sysfs-class-backlight36
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 0000000..4d637e1
--- /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
OpenPOWER on IntegriCloud