snd_register_device — Register the ALSA device file for the card
int snd_register_device
(int type, struct snd_card * card, int dev, const struct file_operations * f_ops, void * private_data, const char * name);
the device type, SNDRV_DEVICE_TYPE_XXX
the card instance
the device index
the file operations
user pointer for f_ops->open
the device file name
Registers an ALSA device file for the given card. The operators have to be set in reg parameter.
This function uses the card's device pointer to link to the correct struct device.
Returns zero if successful, or a negative error code on failure.