From mboxrd@z Thu Jan  1 00:00:00 1970
From: Lars-Peter Clausen <lars@metafoo.de>
Subject: Re: How to specify data format if playback/capture
 were different ?
Date: Wed, 22 May 2013 10:43:02 +0200
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To: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Linux-ALSA <alsa-devel@alsa-project.org>, Mark Brown <broonie@opensource.wolfsonmicro.com>, Liam Girdwood <lgirdwood@gmail.com>, Simon <horms@verge.net.au>, Kuninori Morimoto <kuninori.morimoto.gx@gmail.com>
List-Id: alsa-devel@alsa-project.org

On 05/22/2013 03:12 AM, Kuninori Morimoto wrote:
> 
> Hi again
> 
>>>> But, ak4554 case, data formats are
>>>>  playback : SND_SOC_DAIFMT_RIGHT_J
>>>>  capture  : SND_SOC_DAIFMT_LEFT_J
>>>> and, it can't exchange this data format.
>>>>
>>>> CPU driver should set these information for ak4554 when playback/capture.
>>>>
>>>> Then, how to specify these data format on ALSA SoC ?
>>>
>>> You can add two different DAIs one for playback one for capture. Then you
>>> can specify the format for each.
> 
> 1 more question.
> 
> On ak4554 side driver, I guess, it will be
> 
> struct snd_soc_dai_driver ak4554_playback_dai = {
> 	.name = "ak4554-playback",
> 	.playback = {
> 		...
> 	},
> }
> 
> struct snd_soc_dai_driver ak4554_captrure_dai = {
> 	.name = "ak4554-captrure",
> 	.capture = {
> 		...
> 	},
> };

You'll want to put both DAIs into an array which you can pass to
snd_soc_register_codec, but otherwise it looks ok.

> 
> But, ak4554 needs .symmetric_rates between playback <--> capture.
> Is it possible ?
> Or, am I misunderstanding ?

Yes, that won't work, you'd have to implement this by hand.

- Lars