On Fri, Apr 08, 2011 at 04:43:22PM +0900, Kuninori Morimoto wrote:

# insmod snd-soc-ak4642.ko # insmod snd-soc-fsi-ak4642.ko # # aplay sound.wav # rmmod snd-soc-fsi-ak4642.ko

I guess noone call soc_pcm_trigger(xx, STOP); who should control it ?

I wouldn't 100% rely on that being the case - if the driver is forcibly removing itself from underneath the subsystem then it's not clear if this is a useful thing to try to do. I'd expect that this is something the ALSA core should do if required.