[alsa-devel] Listing up to 8 PCM devices

19 Nov 2008


      Hi,
I'm currently writting a driver with up to 8 pcm devices, so I turned on
"Dynamic device file minor numbers" option. But when I try to list devices
through aplay or a record (which are calling ioctl with cmd
SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE) I can only list devices from 0 to 7. This is
due to this code :
linux/sound/core/pcm.c l.64
------------------------------
    case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
    	{
    		int device;
if (get_user(device, (int __user *)arg))
    			return -EFAULT;
    		mutex_lock(&register_mutex);
    		device = device < 0 ? 0 : device + 1;
    		while (device < SNDRV_PCM_DEVICES) {
    			if (snd_pcm_search(card, device))
    				break;
    			device++;
    		}
    		if (device == SNDRV_PCM_DEVICES)
    			device = -1;
    		mutex_unlock(&register_mutex);
    		if (put_user(device, (int __user *)arg))
    			return -EFAULT;
    		return 0;
    	}
------------------------------
because SNDRV_PCM_DEVICES is defined to 8 and do not change even if I selected
"Dynamic device file minor numbers" option.
Is there anything I missed ?

[alsa-devel] Listing up to 8 PCM devices

Gregoire ETIENNE