SoC Audio for Au1000/Au1500/Au1100

modulename: snd-soc-au1x-dma.ko

configname: CONFIG_SND_SOC_AU1XAUDIO

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC Audio for Au1000/Au1500/Au1100
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This is a driver set for the AC97 unit and the
old DMA controller as found on the Au1000/Au1500/Au1100 chips.

source code: