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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.
+