[alsa-devel] ASoC: WM8804: fsi-wm8804

Mark Brown broonie at opensource.wolfsonmicro.com
Mon Nov 15 13:33:51 CET 2010

On Mon, Nov 15, 2010 at 01:26:37PM +0100, Grzegorz Daniluk wrote:

> I'm trying to use the wm8804 codec in my SH4-based system (Renesas 
> SH7724 to be precise). I have used the latest kernel 2.6.37-rc1 where 
> there is the codec driver for wm8804. However, I have to write my own 
> fsi-wm8804.c (like e.g. fsi-da7210.c). My code attached below. After 
> compiling it with the rest of the kernel sources or compiling as an 
> external module my alsa still does not see any soundcards. However, by 
> running i2cdetect I can see that the device is correctly taken by the 
> codec driver so the problem is somewhere with my fsi-wm8804 probably. 

Did you register the I2C device for the CODEC with the I2C subsystem?
If that's not the issue could you please provide a kernel log with
#define DEBUG at the top of soc-core.c?

> static int fsi_wm8804_init(struct snd_soc_codec *codec)
> {
>     return 0;
> }

Remove unused functions.

>     if(substream->stream == SNDRV_PCM_STREAM_CAPTURE)
>     {
>         snd_soc_dai_set_pll(dai, 0, 0, 12000000, 94310400);
>     }
>     else if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
>     {
>         snd_soc_dai_set_pll(dai, 0, 0, 12000000, 98304000);
>     }

This is going to prevent simultaneous playback and record; this may not
be an issue in your system but I wanted to be sure you were aware of it.

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