Baytrail with RT5640 codec

modulename: snd-soc-sst-byt-rt5640-mach.ko

configname: CONFIG_SND_SOC_INTEL_BYT_RT5640_MACH

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>Intel Machine drivers
└─>Baytrail with RT5640 codec
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This adds audio driver for Intel Baytrail platform based boards
with the RT5640 audio codec. This driver is deprecated, use
SND_SOC_INTEL_BYTCR_RT5640_MACH instead for better functionality.

source code:
sound/soc//intel/boards/