SoC Audio for the Intel PXA2xx chip

modulename: snd-soc-pxa2xx.ko

configname: CONFIG_SND_PXA2XX_SOC

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC Audio for the Intel PXA2xx 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 PXA2xx AC97, I2S or SSP interface. You will also need
to select the audio interfaces to support below.

source code:
sound/soc//pxa/