/*
Sync with PCM stream stops.
*/
void line6_pcm_disconnect(struct snd_line6_pcm *line6pcm)
{
line6_unlink_audio_urbs(line6pcm, &line6pcm->out);
line6_unlink_audio_urbs(line6pcm, &line6pcm->in);
line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
}
/* 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;
}
/* 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;
}
/* free a buffer if all streams are closed;
* call this in line6pcm.state_mutex
*/
static void line6_buffer_release(struct snd_line6_pcm *line6pcm,
struct line6_pcm_stream *pstr, int type)
{
clear_bit(type, &pstr->opened);
if (!pstr->opened) {
line6_wait_clear_audio_urbs(line6pcm, pstr);
kfree(pstr->buffer);
pstr->buffer = NULL;
}
}
/* prepare pcm callback */
int snd_line6_prepare(struct snd_pcm_substream *substream)
{
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);
if (!pstr->running)
line6_wait_clear_audio_urbs(line6pcm, pstr);
if (!test_and_set_bit(LINE6_FLAG_PREPARED, &line6pcm->flags)) {
line6pcm->out.count = 0;
line6pcm->out.pos = 0;
line6pcm->out.pos_done = 0;
line6pcm->out.bytes = 0;
line6pcm->in.count = 0;
line6pcm->in.pos_done = 0;
line6pcm->in.bytes = 0;
}
mutex_unlock(&line6pcm->state_mutex);
return 0;
}