int snd_compress_register(struct snd_compr *device)
{
	int retval;

	if (device->name == NULL || device->dev == NULL || device->ops == NULL)
		return -EINVAL;

	pr_debug("Registering compressed device %s\n", device->name);
	if (snd_BUG_ON(!device->ops->open))
		return -EINVAL;
	if (snd_BUG_ON(!device->ops->free))
		return -EINVAL;
	if (snd_BUG_ON(!device->ops->set_params))
		return -EINVAL;
	if (snd_BUG_ON(!device->ops->trigger))
		return -EINVAL;

	mutex_init(&device->lock);

	/* register a compressed card */
	mutex_lock(&device_mutex);
	retval = snd_compress_add_device(device);
	mutex_unlock(&device_mutex);
	return retval;
}

Unknown