SoC Audio for the Atmel AT91 System-on-Chip

modulename: snd-soc-at91.ko

configname: CONFIG_SND_AT91_SOC

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC Audio for the Atmel AT91 System-on-Chip
In linux kernel since version 2.6.21.1 (release Date: 2007-04-27)  
Say Y or M if you want to add support for codecs attached to
the AT91 SSC interface. You will also need
to select the audio interfaces to support below.

source code: