static int idma_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct idma_ctrl *prtd = substream->runtime->private_data;
int ret = 0;
pr_debug("Entered %s\n", __func__);
spin_lock(&prtd->lock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
prtd->state |= ST_RUNNING;
idma.trigger_stat = LPAM_DMA_START;
idma_ctrl(LPAM_DMA_START);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
prtd->state &= ~ST_RUNNING;
idma.trigger_stat = LPAM_DMA_STOP;
idma_ctrl(LPAM_DMA_STOP);
break;
default:
ret = -EINVAL;
break;
}
spin_unlock(&prtd->lock);
return ret;
}
static int idma_prepare(struct snd_pcm_substream *substream)
{
struct idma_ctrl *prtd = substream->runtime->private_data;
pr_debug("Entered %s\n", __func__);
prtd->pos = prtd->start;
/* flush the DMA channel */
idma_ctrl(LPAM_DMA_STOP);
idma_enqueue(substream);
return 0;
}
