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