SoC Audio for Au1200/Au1250/Au1550

modulename: snd-soc-au1xpsc-dbdma.ko

configname: CONFIG_SND_SOC_AU1XPSC

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC Audio for Au1200/Au1250/Au1550
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
This option enables support for the Programmable Serial
Controllers in AC97 and I2S mode, and the Descriptor-Based DMA
Controller (DBDMA) as found on the Au1200/Au1250/Au1550 SoC.

source code: