[alsa-devel] Listing up to 8 PCM devices

[Takashi Iwai]

At Wed, 19 Nov 2008 08:19:21 +0000 (UTC),
Gregoire ETIENNE wrote:
> 
> 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 ?

The definition of SNDRV_PCM_DEVICES was changed depending on
CONFIG_SND_DYNAMIC_MINORS in the recent version.
I guess you are referring to an old version.


Takashi