How to create a proc entry for an ASoc codec?

How to create a proc entry for an ASoc codec?

[Lin, Mengdong]

Hi,

How to create a proc entry for an ASoc codec under the sound card?

We hope to create an proc entry for an I2S codec under /proc/asound/cardx, to debug the codec status at runtime.

So after the machine driver calls snd_soc_register_card(&soc_card), I calls snd_card_proc_new(soc_card .snd_card, ....)
But no codec entry is created although dmesg shows this function succeeds.

How ASoC creates the proc entries such as 'id' for the sound card?

Thanks
Mengdong

Re: How to create a proc entry for an ASoc codec?

[Liam Girdwood]

On Fri, 2014-04-11 at 10:16 +0100, Lin, Mengdong wrote:
> Hi,
> 
>  
> 
> How to create a proc entry for an ASoc codec under the sound card?
> 
>  
> 
> We hope to create an proc entry for an I2S codec
> under /proc/asound/cardx, to debug the codec status at runtime.
> 
>  
> 
> So after the machine driver calls snd_soc_register_card(&soc_card), I
> calls snd_card_proc_new(soc_card .snd_card, ….) 
> 
> But no codec entry is created although dmesg shows this function
> succeeds.
 
> 
> How ASoC creates the proc entries such as ‘id’ for the sound card?
> 
You should see this :-

cat /proc/asound/card0/id 
broadwellrt286

ASoC exposes sound card specific data under the sysfs entry for the
device. e.g. 

ls /sys/bus/platform/devices/broadwell-audio/
Capture PCM/  driver/       modalias      Offload1/     sound/        System PCM/   
Codec/        Loopback PCM/ Offload0/     power/        subsystem/    uevent 

Liam


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Re: How to create a proc entry for an ASoc codec?

[Mark Brown]

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On Fri, Apr 11, 2014 at 09:16:03AM +0000, Lin, Mengdong wrote:

> How to create a proc entry for an ASoc codec under the sound card?

> We hope to create an proc entry for an I2S codec under /proc/asound/cardx, to debug the codec status at runtime.

> So after the machine driver calls snd_soc_register_card(&soc_card), I calls snd_card_proc_new(soc_card .snd_card, ....)
> But no codec entry is created although dmesg shows this function succeeds.

> How ASoC creates the proc entries such as 'id' for the sound card?

In addition to what Liam said it's worth mentioning that due to the
deprecation of /proc most of the ASoC diagnostics are exposed via
debugfs (and for things using regmap that also has debugfs data too) -
you're likely to get much more useful information that way.

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