SoC AC97 Audio support for e740

modulename: snd-soc-e740.ko

configname: CONFIG_SND_PXA2XX_SOC_E740

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SoC AC97 Audio support for e740
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Say Y if you want to add support for SoC audio on the
toshiba e740 PDA

source code:
sound/soc//pxa/