For the kernel driver I used the SD / MMC Mod driver from the RTL8186 SourceForge page and redesigned it to use it as GPIO Driver.
 
At the moment it’s not finished, I’ve only build testing functions to see and measure if the GPIOs work.
 
The next steps are to use the proc files system and use a simple application to control the GPIOs via the driver.

http://code.google.com/p/rtl8186-gpio-drv/