Merge commit 'v2.6.39' into 20110526
[linux-2.6.git] / Documentation / ABI / testing / sysfs-class-led
1 What:           /sys/class/leds/<led>/brightness
2 Date:           March 2006
3 KernelVersion:  2.6.17
4 Contact:        Richard Purdie <rpurdie@rpsys.net>
5 Description:
6                 Set the brightness of the LED. Most LEDs don't
7                 have hardware brightness support so will just be turned on for
8                 non-zero brightness settings. The value is between 0 and
9                 /sys/class/leds/<led>/max_brightness.
10
11 What:           /sys/class/leds/<led>/max_brightness
12 Date:           March 2006
13 KernelVersion:  2.6.17
14 Contact:        Richard Purdie <rpurdie@rpsys.net>
15 Description:
16                 Maximum brightness level for this led, default is 255 (LED_FULL).
17
18 What:           /sys/class/leds/<led>/trigger
19 Date:           March 2006
20 KernelVersion:  2.6.17
21 Contact:        Richard Purdie <rpurdie@rpsys.net>
22 Description:
23                 Set the trigger for this LED. A trigger is a kernel based source
24                 of led events.
25                 You can change triggers in a similar manner to the way an IO
26                 scheduler is chosen. Trigger specific parameters can appear in
27                 /sys/class/leds/<led> once a given trigger is selected.
28
29 What:           /sys/class/leds/<led>/inverted
30 Date:           January 2011
31 KernelVersion:  2.6.38
32 Contact:        Richard Purdie <rpurdie@rpsys.net>
33 Description:
34                 Invert the LED on/off state. This parameter is specific to
35                 gpio and backlight triggers. In case of the backlight trigger,
36                 it is useful when driving a LED which is intended to indicate
37                 a device in a standby like state.