Re: Can anyone help?

[Lee Revell <rlrevell@joe-job.com>]

On Thu, 2006-02-09 at 23:07 +0000, Adrian McMenamin wrote:
> I cannot get aplay to work on my architecture (afaics anyway) eg
> 
> / # aplay -D hw:0,0 /bin/busybox
> aplay: pcm.c: 2119: snd_pcm_open: Assertion `pcmp && name' failed.
> Aborted
> 
> (Nobody has explained to me what that error is - and my reading of the
> code hasn't helped too much :-< )
> 
> So how can I test my driver code?
> 
> I can do things like this:
> 
> / # cat /bin/busybox > /dev/snd/pcmC0D0p
> ALSA /home/adrian/aica/aica/snd_card_aica.c:151: In snd_aicapcm_pcm_open
> cat: Write Error: File descriptor in bad state
> / # Feb 10 00:01:02 dreamy user.warn kernel:
> ALSA /home/adrian/aica/aica/snd_card_aica.c:151: In snd_aicapcm_pcm_open
> 
> But as the above fragment shows this opens the device file but not much
> else (as I assume it has no automagic way of accessing the alsa
> subsystem)

It looks like you fail to set card->id in your __devinit routine.  This
field is used by the alsa-lib to find the right config file
in /usr/share/alsa/cards/.  For example if alsa-lib is supposed to use 
/usr/share/alsa/cards/Audigy2.conf set it to "Audigy2".

The ID is available in /proc/asound/cardX/id.

Here is the code from the emu10k1 driver:

        if (!*card->id && c->id) { 
                int i, n = 0; 
                strlcpy(card->id, c->id, sizeof(card->id));
                for (;;) {
                        for (i = 0; i < snd_ecards_limit; i++) {
                                if (snd_cards[i] && !strcmp(snd_cards[i]->id, card->id))
                                        break;
                        }
                        if (i >= snd_ecards_limit)
                                break;
                        n++;
                        if (n >= SNDRV_CARDS)
                                break;
                        snprintf(card->id, sizeof(card->id), "%s_%d", c->id, n);
                }
        }


Lee



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