Nokia Retu and Tahvo multi-function device

modulename: retu-mfd.ko

configname: CONFIG_MFD_RETU

Linux Kernel Configuration
└─>Device Drivers
└─>Multifunction device drivers
└─>Nokia Retu and Tahvo multi-function device
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Retu and Tahvo are a multi-function devices found on Nokia
Internet Tablets (770, N800 and N810).

source code:
drivers/mfd//retu-mfd.c