Documentation for kmod-leds-gpio?

Can anyone point me to documentation explaining the use of kmod-leds-gpio? As the name says it is for controlling leds on gpio lines but i cannot figure how to actually use the module. I cannot find anything online about it either besides the page describing the module (minimally).

This is an in-tree kernel module (drivers/leds/leds-gpio.c), so the documentation is at kernel.org.