Maxim MAX7300 GPIO expander

modulename: max7300.ko

and/or

gpio-max7300.ko

configname: CONFIG_GPIO_MAX7300

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>I2C support
└─>Maxim MAX7300 GPIO expander
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
GPIO driver for Maxim MAX7301 I2C-based GPIO expander.

source code:
drivers/gpio/max7300.c