arecord answer me this : arecord -l **** List of PLAYBACK Hardware Devices **** card 0: codec [xxxxxxx audio codec], device 0: xxxxxx xxxxxx-I2S-0 [] Subdevices: 1/1 Subdevice #0: subdevice #0

After looking for traces in pcm.c and sound.c, I've found this : soc_new_pcm playback 1, capture 1 snd_pcm_dev_register str pcmC0D0p snd_register_device_for_dev minor 16 snd_pcm_dev_register str pcmC0D0c snd_register_device_for_dev minor 24 snd_register_device_for_dev minor 0

My pcmC0D0x minor devices were wrong :'( i've remade them and now it works.

Thanks a lot.

Regards, Alex.

-----Message d'origine----- De : Clemens Ladisch [mailto:cladisch@fastmail.net] Envoyé : vendredi 11 janvier 2008 14:17 À : Alexandre BOUIN; alsa-devel@alsa-project.org Objet : Re: [alsa-devel] ALSA : Can't open capture device

Alexandre BOUIN wrote:

I'm working on an intern project, using an AT91SAM9260EK-based board, embedded system. Our kernel contains a full ALSA 1.14 with ASoC layer. Our ASoC driver works well in capture and playback, if we are using OSS layer or directly /dev/dsp. So I need some tips on ALSA layer side :

here you can see that my device is created : ll /dev/snd/ crwxrwxrwx 1 root root 116, 0 Dec 26 2007 controlC0 crwxrwxrwx 1 root root 116, 4 Dec 26 2007 hwC0D0 crwxrwxrwx 1 root root 116, 14 Dec 26 2007 pcmC0D0c crwxrwxrwx 1 root root 116, 16 Dec 26 2007 pcmC0D0p ll /dev/dsp crwxrwxrwx 1 root root 14, 3 Dec 26 2007 /dev/dsp

A cat on playback device works (I added some traces in kernel) : cat < /dev/snd/pcmC0D0p snd_pcm_open : enter snd_pcm_open_file : before snd_pcm_open_substream snd_pcm_open_file : after snd_pcm_open_substream cat: read error: Invalid argument

But a cat on capture device does not work : cat < /dev/snd/pcmC0D0c -sh: cannot open /dev/snd/pcmC0D0c: No such device

Does the capture device appear in /proc/asound/devices or in the output of "arecord -l"?

Regards, Clemens