LED Trigger support

modulename: led-triggers.ko

configname: CONFIG_LEDS_TRIGGERS

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
└─>LED Trigger support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This option enables trigger support for the leds class.
These triggers allow kernel events to drive the LEDs and can
be configured via sysfs. If unsure, say Y.

source code:
drivers/leds/led-triggers.c