/* 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;
}
/* 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;
}
/* 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;
}