[alsa-devel] ALSA for SoC audio support full duplex problem

jinjin xu freebsdxjj at gmail.com
Tue May 12 11:53:52 CEST 2009

Dear All.

I use on S3C6410(arm),use wm8987 sound card(i2s interface)

It is not use in full duplex.
I grep and diff the drivers


  snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ensoniq_playback1_ops);

  snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ensoniq_capture_ops);


        if (playback)

                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &soc_pcm_ops);


        if (capture)

                snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &soc_pcm_ops);

ens1370.c use two different fops for playback and record(I test it in
Vmware,It can run on full duplex)
soc-core.c use the same fops for  playback and record

It that the problem ?
So how to fix it for support full duplex?


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