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authorCorentin Chary <corentincj@iksaif.net>2009-08-28 14:56:45 +0200
committerLen Brown <len.brown@intel.com>2009-08-28 21:21:12 +0200
commit5f634c6527249275df4199a294ee9cec2f3ff3b1 (patch)
tree44c2d69f6e28823a6c1c66683440d7ba2e3890a4 /Documentation/ABI
parentvideo/lcd: document sysfs interface (diff)
downloadlinux-5f634c6527249275df4199a294ee9cec2f3ff3b1.tar.xz
linux-5f634c6527249275df4199a294ee9cec2f3ff3b1.zip
led: document sysfs interface
Also fix Documentation/led-class.txt, the acceptable range of values for brightness is 0-max_brightness, not 0-255. 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/leds/<led>/brightness
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: Richard Purdie <rpurdie@rpsys.net>
+Description:
+ Set the brightness of the LED. Most LEDs don't
+ have hardware brightness support so will just be turned on for
+ non-zero brightness settings. The value is between 0 and
+ /sys/class/leds/<led>/max_brightness.
+
+What: /sys/class/leds/<led>/max_brightness
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: Richard Purdie <rpurdie@rpsys.net>
+Description:
+ Maximum brightness level for this led, default is 255 (LED_FULL).
+
+What: /sys/class/leds/<led>/trigger
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: Richard Purdie <rpurdie@rpsys.net>
+Description:
+ Set the trigger for this LED. A trigger is a kernel based source
+ of led events.
+ You can change triggers in a similar manner to the way an IO
+ scheduler is chosen. Trigger specific parameters can appear in
+ /sys/class/leds/<led> once a given trigger is selected.
+