static int qsd_pcm_playback_copy(struct snd_pcm_substream *substream, int a,
snd_pcm_uframes_t hwoff, void __user *buf,
snd_pcm_uframes_t frames)
{
int fbytes = 0;
size_t xfer;
int rc;
struct snd_pcm_runtime *runtime = substream->runtime;
struct qsd_audio *prtd = runtime->private_data;
fbytes = frames_to_bytes(runtime, frames);
prtd->cbs.buffer = (void *)buf;
prtd->cbs.phys_addr = 0;
prtd->cbs.max_size = fbytes;
prtd->cbs.actual_size = fbytes;
prtd->pcm_buf_pos += fbytes;
mutex_lock(&the_locks.lock);
xfer = cad_write(prtd->cad_w_handle, &prtd->cbs);
mutex_unlock(&the_locks.lock);
mutex_lock(&the_locks.mixer_lock);
if (qsd_glb_ctl.update) {
rc = qsd_audio_volume_update(prtd);
qsd_glb_ctl.update = 0;
}
mutex_unlock(&the_locks.mixer_lock);
return 0;
}
static int snd_qsd_fake_playback_dma_thread(void *data)
{
int rc = 0;
int rcopy;
struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct qsd_audio *prtd = runtime->private_data;
struct audio_buffer *ab;
struct audio_client *ac;
unsigned char *ptr;
while (prtd->thread_exit == 0)
{
DBG(" start handler");
// wait until state is changed
// at this point this thread waits until SNDRV_PCM_TRIGGER_START comes
// SNDRV_PCM_TRIGGER_STOP
//
wait_event_interruptible(prtd->fake_wait, (prtd->start == 1 || prtd->thread_exit == 1));
DBG(" wake up %d %d", prtd->start, prtd->thread_exit);
if (prtd->thread_exit) break;
ac = prtd->ac;
while (prtd->start == 1)
{
// wait until new buffer appear
//
// DBG(" ac = %X, prtd = %X, substream = %X", ac, prtd, substream);
ab = ac->buf + ac->cpu_buf;
if (ab->used)
{
DBG("wait a buffer %d", ac->cpu_buf);
if (!wait_event_timeout(ac->wait, (ab->used == 0), 5 * HZ))
{
DBG("timeout. dsp dead?\n");
rc = -EFAULT;
goto fail;
}
// some buffer become free, report about state change now
//
snd_pcm_period_elapsed(prtd->substream);
}
mutex_lock(&prtd->mlock);
if (prtd->start == 0)
{
DBG("flag is set - exit thread");
mutex_unlock(&prtd->mlock);
break; // EXIT FROM LOOP
}
// send buffer to DSP
//
ptr = runtime->dma_area + prtd->buf_curoff;
rcopy = prtd->buf_chunk;
if (rcopy > ab->size)
rcopy = ab->size;
memcpy(ab->data, ptr, rcopy);
ab->used = rcopy;
q6audio_write(ac, ab);
ac->cpu_buf ^= 1;
// move fake dma pointer forward
//
spin_lock(&prtd->lock);
prtd->buf_curoff += prtd->buf_chunk;
if (prtd->buf_curoff >= prtd->buf_maxoff)
prtd->buf_curoff = 0;
spin_unlock(&prtd->lock);
// update stream settings if required
//
if (qsd_glb_ctl.update)
{
rc = qsd_audio_volume_update(prtd);
qsd_glb_ctl.update = 0;
}
mutex_unlock(&prtd->mlock);
fail:
; // CotullaTODO: handle this fault somehow.
}
DBG(" end handler");
}
DBG(" exit");
return 0;
}
