Example #1
0
/* common PCM hw_params callback */
int snd_line6_hw_params(struct snd_pcm_substream *substream,
			struct snd_pcm_hw_params *hw_params)
{
	int ret;
	struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream);
	struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream);

	mutex_lock(&line6pcm->state_mutex);
	ret = line6_buffer_acquire(line6pcm, pstr, substream->stream,
	                           LINE6_STREAM_PCM);
	if (ret < 0)
		goto error;

	ret = snd_pcm_lib_malloc_pages(substream,
				       params_buffer_bytes(hw_params));
	if (ret < 0) {
		line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM);
		goto error;
	}

	pstr->period = params_period_bytes(hw_params);
 error:
	mutex_unlock(&line6pcm->state_mutex);
	return ret;
}
Example #2
0
File: pcm.c Project: 020gzh/linux
/* Acquire and start duplex streams:
 * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
 */
int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type)
{
	struct line6_pcm_stream *pstr;
	int ret = 0, dir;

	mutex_lock(&line6pcm->state_mutex);
	for (dir = 0; dir < 2; dir++) {
		pstr = get_stream(line6pcm, dir);
		ret = line6_buffer_acquire(line6pcm, pstr, type);
		if (ret < 0)
			goto error;
		if (!pstr->running)
			line6_wait_clear_audio_urbs(line6pcm, pstr);
	}
	for (dir = 0; dir < 2; dir++) {
		ret = line6_stream_start(line6pcm, dir, type);
		if (ret < 0)
			goto error;
	}
 error:
	mutex_unlock(&line6pcm->state_mutex);
	if (ret < 0)
		line6_pcm_release(line6pcm, type);
	return ret;
}
Example #3
0
/* Acquire and optionally start duplex streams:
 * type is either LINE6_STREAM_IMPULSE or LINE6_STREAM_MONITOR
 */
int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int type, bool start)
{
	struct line6_pcm_stream *pstr;
	int ret = 0, dir;

	/* TODO: We should assert SNDRV_PCM_STREAM_PLAYBACK/CAPTURE == 0/1 */
	mutex_lock(&line6pcm->state_mutex);
	for (dir = 0; dir < 2; dir++) {
		pstr = get_stream(line6pcm, dir);
		ret = line6_buffer_acquire(line6pcm, pstr, dir, type);
		if (ret < 0)
			goto error;
		if (!pstr->running)
			line6_wait_clear_audio_urbs(line6pcm, pstr);
	}
	if (start) {
		for (dir = 0; dir < 2; dir++) {
			ret = line6_stream_start(line6pcm, dir, type);
			if (ret < 0)
				goto error;
		}
	}
 error:
	mutex_unlock(&line6pcm->state_mutex);
	if (ret < 0)
		line6_pcm_release(line6pcm, type);
	return ret;
}