[alsa-devel] ALSA: How to create multiple cards?

Paul Menzel paulepanter at users.sourceforge.net
Thu Aug 12 09:46:33 CEST 2010

Dear Truong,

Am Donnerstag, den 05.08.2010, 20:11 -0700 schrieb Truong Hoang:

> I have a problem that I need help from the ALSA experts.
> I want to write an alsa shim .ko which creates multiple cards. Let's assume
> 2 cards. My program calls
> snd_card_create() and snd_card_register() two times. I also has 1 PCM for
> each of these card.
> After install the .ko to the kernal, I see the /proc/asound has card0 and
> card1. But the "aplay -l" sees only card0. The snd_card_next() only returns
> 0 (i.e. 1 card).
> What did I miss in my program? The /dev/snd/ has only hwC0D0 and pcmD0C0p.
> I am a beginner in ALSA, so I appreciate if you can give the explanation in
> detail.

please attach your source code so the experts – not me – can point out
what is missing.


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