static int loopback_trigger(struct snd_pcm_substream *substream, int cmd) { struct snd_pcm_runtime *runtime = substream->runtime; struct loopback_pcm *dpcm = runtime->private_data; struct loopback_cable *cable = dpcm->cable; int err, stream = 1 << substream->stream; switch (cmd) { case SNDRV_PCM_TRIGGER_START: err = loopback_check_format(cable, substream->stream); if (err < 0) return err; dpcm->last_jiffies = jiffies; dpcm->pcm_rate_shift = 0; dpcm->last_drift = 0; spin_lock(&cable->lock); cable->running |= stream; cable->pause &= ~stream; loopback_timer_start(dpcm); spin_unlock(&cable->lock); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) loopback_active_notify(dpcm); break; case SNDRV_PCM_TRIGGER_STOP: spin_lock(&cable->lock); cable->running &= ~stream; cable->pause &= ~stream; loopback_timer_stop(dpcm); spin_unlock(&cable->lock); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) loopback_active_notify(dpcm); break; case SNDRV_PCM_TRIGGER_PAUSE_PUSH: case SNDRV_PCM_TRIGGER_SUSPEND: spin_lock(&cable->lock); cable->pause |= stream; loopback_timer_stop(dpcm); spin_unlock(&cable->lock); break; case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: case SNDRV_PCM_TRIGGER_RESUME: spin_lock(&cable->lock); dpcm->last_jiffies = jiffies; cable->pause &= ~stream; loopback_timer_start(dpcm); spin_unlock(&cable->lock); break; default: return -EINVAL; } return 0; }
static void loopback_timer_function(unsigned long data) { struct loopback_pcm *dpcm = (struct loopback_pcm *)data; unsigned int running; running = loopback_pos_update(dpcm->cable); if (running & (1 << dpcm->substream->stream)) { loopback_timer_start(dpcm); if (dpcm->period_update_pending) { dpcm->period_update_pending = 0; snd_pcm_period_elapsed(dpcm->substream); } } }
static void loopback_timer_function(unsigned long data) { struct loopback_pcm *dpcm = (struct loopback_pcm *)data; unsigned long flags; spin_lock_irqsave(&dpcm->cable->lock, flags); if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) { loopback_timer_start(dpcm); if (dpcm->period_update_pending) { dpcm->period_update_pending = 0; spin_unlock_irqrestore(&dpcm->cable->lock, flags); /* need to unlock before calling below */ snd_pcm_period_elapsed(dpcm->substream); return; } } spin_unlock_irqrestore(&dpcm->cable->lock, flags); }