static void loopback_bytepos_update(struct loopback_pcm *dpcm,
unsigned int delta,
unsigned int cmd)
{
unsigned int count;
unsigned long last_pos;
last_pos = byte_pos(dpcm, dpcm->irq_pos);
dpcm->irq_pos += delta * dpcm->pcm_bps;
count = byte_pos(dpcm, dpcm->irq_pos) - last_pos;
if (!count)
return;
if (cmd == BYTEPOS_UPDATE_CLEAR)
clear_capture_buf(dpcm, count);
else if (cmd == BYTEPOS_UPDATE_COPY)
copy_play_buf(dpcm->cable->streams[SNDRV_PCM_STREAM_PLAYBACK],
dpcm->cable->streams[SNDRV_PCM_STREAM_CAPTURE],
count);
dpcm->buf_pos += count;
dpcm->buf_pos %= dpcm->pcm_buffer_size;
if (dpcm->irq_pos >= dpcm->period_size_frac) {
dpcm->irq_pos %= dpcm->period_size_frac;
dpcm->period_update_pending = 1;
}
}
static inline unsigned int bytepos_delta(struct loopback_pcm *dpcm,
unsigned int jiffies_delta)
{
unsigned long last_pos;
unsigned int delta;
last_pos = byte_pos(dpcm, dpcm->irq_pos);
dpcm->irq_pos += jiffies_delta * dpcm->pcm_bps;
delta = byte_pos(dpcm, dpcm->irq_pos) - last_pos;
if (delta >= dpcm->last_drift)
delta -= dpcm->last_drift;
dpcm->last_drift = 0;
if (dpcm->irq_pos >= dpcm->period_size_frac) {
dpcm->irq_pos %= dpcm->period_size_frac;
dpcm->period_update_pending = 1;
}
return delta;
}
static void minivosc_pos_update(struct minivosc_device *mydev)
{
unsigned int last_pos, count;
unsigned long delta;
if (!mydev->running)
return;
dbg2("*minivosc_pos_update: running ");
delta = jiffies - mydev->last_jiffies;
dbg2("* : jiffies %lu, ->last_jiffies %lu, delta %lu", jiffies, mydev->last_jiffies, delta);
if (!delta)
return;
mydev->last_jiffies += delta;
last_pos = byte_pos(mydev->irq_pos);
mydev->irq_pos += delta * mydev->pcm_bps;
count = byte_pos(mydev->irq_pos) - last_pos;
dbg2("* : last_pos %d, c->irq_pos %d, count %d", last_pos, mydev->irq_pos, count);
if (!count)
return;
// FILL BUFFER HERE
minivosc_xfer_buf(mydev, count);
if (mydev->irq_pos >= mydev->period_size_frac)
{
dbg2("* : mydev->irq_pos >= mydev->period_size_frac %d", mydev->period_size_frac);
mydev->irq_pos %= mydev->period_size_frac;
mydev->period_update_pending = 1;
}
}
