[ASoC] machine driver and channel configuration

[ASoC] machine driver and channel configuration

[Matthieu CASTET]

Hi,

If the platform/cpu_dai driver and codec support capture and playback channels.
But on the board only the playback link is connected.

In this configuration, the codec and platform/cpu_dai driver shouldn't try to
use the capture path (and the resource associated to this).


Is there a way to do something like that ?


Thanks

Matthieu

Re: [ASoC] machine driver and channel configuration

[Timur Tabi]

Matthieu CASTET wrote:
> Hi,
> 
> If the platform/cpu_dai driver and codec support capture and playback channels.
> But on the board only the playback link is connected.
> 
> In this configuration, the codec and platform/cpu_dai driver shouldn't try to
> use the capture path (and the resource associated to this).
> 
> 
> Is there a way to do something like that ?

I'm just learning about ASoC myself, but using wm8731.c as an example, wouldn't this work:

struct snd_soc_codec_dai wm8731_dai = {
	.name = "WM8731",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8731_RATES,
		.formats = WM8731_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8731_RATES,
		.formats = WM8731_FORMATS,},

Just change capture.channels_min and channels_max to 0.

-- 
Timur Tabi
Linux Kernel Developer @ Freescale

Re: [ASoC] machine driver and channel configuration

[Matthieu CASTET]

Hi,

Timur Tabi a écrit :
> Matthieu CASTET wrote:
>> Hi,
>>
>> If the platform/cpu_dai driver and codec support capture and playback 
>> channels.
>> But on the board only the playback link is connected.
>>
>> In this configuration, the codec and platform/cpu_dai driver shouldn't 
>> try to
>> use the capture path (and the resource associated to this).
>>
>>
>> Is there a way to do something like that ?
> 
> I'm just learning about ASoC myself, but using wm8731.c as an example, 
> wouldn't this work:
> 
> struct snd_soc_codec_dai wm8731_dai = {
>     .name = "WM8731",
>     .playback = {
>         .stream_name = "Playback",
>         .channels_min = 1,
>         .channels_max = 2,
>         .rates = WM8731_RATES,
>         .formats = WM8731_FORMATS,},
>     .capture = {
>         .stream_name = "Capture",
>         .channels_min = 1,
>         .channels_max = 2,
>         .rates = WM8731_RATES,
>         .formats = WM8731_FORMATS,},
> 
> Just change capture.channels_min and channels_max to 0.
> 

Hum, yes I could change channel info at runtime before doing the 
platform_device_add in machine driver.

I'll try that.

Thanks.
Matthieu

Re: [ASoC] machine driver and channel configuration

[Nobin Mathew]

I think you can have multiple dai objects, in your dai object dont
enable support for Capture, and use that dai object in your Machine
driver.

This should solve the issue



On 6/8/07, Matthieu CASTET <matthieu.castet@parrot.com> wrote:
> Hi,
>
> Timur Tabi a écrit :
> > Matthieu CASTET wrote:
> >> Hi,
> >>
> >> If the platform/cpu_dai driver and codec support capture and playback
> >> channels.
> >> But on the board only the playback link is connected.
> >>
> >> In this configuration, the codec and platform/cpu_dai driver shouldn't
> >> try to
> >> use the capture path (and the resource associated to this).
> >>
> >>
> >> Is there a way to do something like that ?
> >
> > I'm just learning about ASoC myself, but using wm8731.c as an example,
> > wouldn't this work:
> >
> > struct snd_soc_codec_dai wm8731_dai = {
> >     .name = "WM8731",
> >     .playback = {
> >         .stream_name = "Playback",
> >         .channels_min = 1,
> >         .channels_max = 2,
> >         .rates = WM8731_RATES,
> >         .formats = WM8731_FORMATS,},
> >     .capture = {
> >         .stream_name = "Capture",
> >         .channels_min = 1,
> >         .channels_max = 2,
> >         .rates = WM8731_RATES,
> >         .formats = WM8731_FORMATS,},
> >
> > Just change capture.channels_min and channels_max to 0.
> >
>
> Hum, yes I could change channel info at runtime before doing the
> platform_device_add in machine driver.
>
> I'll try that.
>
> Thanks.
> Matthieu
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