Audio: MEMS Digital Microphone

To compile module:

http://raspberrypi.stackexchange.com/questions/39845/how-compile-a-loadable-kernel-module-without-recompiling-kernel

Edit asoc-i2s-loader.c

vi asoc-i2s-loader.c                                                                                                                 
make                                                                                                                                 
insmod asoc-i2s-loader.ko                                                                                                            
dmesg                                                                                                                                
arecord -D hw:0 -c2 -r 48000 -f S32_LE -t wav -v file.wav