1What: /sys/class/leds/<led>/brightness 2Date: March 2006 3KernelVersion: 2.6.17 4Contact: Richard Purdie <rpurdie@rpsys.net> 5Description: 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 11What: /sys/class/leds/<led>/max_brightness 12Date: March 2006 13KernelVersion: 2.6.17 14Contact: Richard Purdie <rpurdie@rpsys.net> 15Description: 16 Maximum brightness level for this led, default is 255 (LED_FULL). 17 18What: /sys/class/leds/<led>/trigger 19Date: March 2006 20KernelVersion: 2.6.17 21Contact: Richard Purdie <rpurdie@rpsys.net> 22Description: 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 29What: /sys/class/leds/<led>/inverted 30Date: January 2011 31KernelVersion: 2.6.38 32Contact: Richard Purdie <rpurdie@rpsys.net> 33Description: 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. 38