LED Support

modulename: led-core.ko

configname: CONFIG_NEW_LEDS

Linux Kernel Configuration
└─>Device Drivers
└─>LED Support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Say Y to enable Linux LED support. This allows control of supported
LEDs from both userspace and optionally, by kernel events (triggers).

This is not related to standard keyboard LEDs which are controlled
via the input system.

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