Janz VMOD-TTL Digital IO Module

modulename: gpio-janz-ttl.ko

configname: CONFIG_GPIO_JANZ_TTL

Linux Kernel Configuration
└─>Device Drivers
└─>GPIO Support
└─>MFD GPIO expanders
└─>Janz VMOD-TTL Digital IO Module
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
This enables support for the Janz VMOD-TTL Digital IO module.
This driver provides support for driving the pins in output
mode only. Input mode is not supported.

source code:
drivers/gpio/gpio-janz-ttl.c