NXP PCF50633 GPIO

modulename: pcf50633-gpio.ko

configname: CONFIG_PCF50633_GPIO

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>NXP PCF50633 GPIO
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
Say yes here if you want to include support GPIO for pins on
the PCF50633 chip.

source code: