/**
* Demux thread function handling data from specific TSIF.
*
* @arg: TSIF number
*/
static int mpq_dmx_tsif_thread(void *arg)
{
struct mpq_demux *mpq_demux;
struct tsif_driver_info *tsif_driver;
size_t packets = 0;
int tsif = (int)arg;
int ret;
do {
ret = wait_event_interruptible(
mpq_dmx_tsif_info.tsif[tsif].wait_queue,
(atomic_read(
&mpq_dmx_tsif_info.tsif[tsif].data_cnt) != 0) ||
kthread_should_stop());
if ((ret < 0) || kthread_should_stop()) {
MPQ_DVB_DBG_PRINT("%s: exit\n", __func__);
break;
}
if (mutex_lock_interruptible(
&mpq_dmx_tsif_info.tsif[tsif].mutex))
return -ERESTARTSYS;
tsif_driver = &(mpq_dmx_tsif_info.tsif[tsif].tsif_driver);
mpq_demux = mpq_dmx_tsif_info.tsif[tsif].mpq_demux;
/* Check if driver handler is still valid */
if (tsif_driver->tsif_handler == NULL) {
mutex_unlock(&mpq_dmx_tsif_info.tsif[tsif].mutex);
MPQ_DVB_DBG_PRINT(
"%s: tsif was detached\n",
__func__);
continue;
}
tsif_get_state(
tsif_driver->tsif_handler, &(tsif_driver->ri),
&(tsif_driver->wi), &(tsif_driver->state));
if ((tsif_driver->wi == tsif_driver->ri) ||
(tsif_driver->state == tsif_state_stopped) ||
(tsif_driver->state == tsif_state_error)) {
mpq_demux->hw_notification_size = 0;
mutex_unlock(&mpq_dmx_tsif_info.tsif[tsif].mutex);
MPQ_DVB_DBG_PRINT(
"%s: TSIF invalid state %d, %d, %d\n",
__func__,
tsif_driver->state,
tsif_driver->wi,
tsif_driver->ri);
continue;
}
atomic_dec(&mpq_dmx_tsif_info.tsif[tsif].data_cnt);
if (tsif_driver->wi > tsif_driver->ri) {
packets = (tsif_driver->wi - tsif_driver->ri);
mpq_demux->hw_notification_size = packets;
dvb_dmx_swfilter_format(
&mpq_demux->demux,
(tsif_driver->data_buffer +
(tsif_driver->ri * TSIF_PKT_SIZE)),
(packets * TSIF_PKT_SIZE),
DMX_TSP_FORMAT_192_TAIL);
tsif_driver->ri =
(tsif_driver->ri + packets) %
tsif_driver->buffer_size;
tsif_reclaim_packets(
tsif_driver->tsif_handler,
tsif_driver->ri);
} else {
/*
* wi < ri, means wraparound on cyclic buffer.
* Handle in two stages.
*/
packets = (tsif_driver->buffer_size - tsif_driver->ri);
mpq_demux->hw_notification_size = packets;
dvb_dmx_swfilter_format(
&mpq_demux->demux,
(tsif_driver->data_buffer +
(tsif_driver->ri * TSIF_PKT_SIZE)),
(packets * TSIF_PKT_SIZE),
DMX_TSP_FORMAT_192_TAIL);
/* tsif_driver->ri should be 0 after this */
tsif_driver->ri =
(tsif_driver->ri + packets) %
tsif_driver->buffer_size;
packets = tsif_driver->wi;
if (packets > 0) {
mpq_demux->hw_notification_size += packets;
dvb_dmx_swfilter_format(
&mpq_demux->demux,
(tsif_driver->data_buffer +
(tsif_driver->ri * TSIF_PKT_SIZE)),
(packets * TSIF_PKT_SIZE),
DMX_TSP_FORMAT_192_TAIL);
tsif_driver->ri =
(tsif_driver->ri + packets) %
tsif_driver->buffer_size;
}
tsif_reclaim_packets(
tsif_driver->tsif_handler,
tsif_driver->ri);
}
mutex_unlock(&mpq_dmx_tsif_info.tsif[tsif].mutex);
} while (1);
return 0;
}
static ssize_t tsif_read(struct file *filp, char __user *buf, size_t count,
loff_t *f_pos)
{
int avail = 0;
int wi;
#ifdef FEATURE_TSIF_DEBUG_MSG
pr_info("[%s] !!!!!!!\n", __func__);
//g_packet_read_cnt ++;
#endif
struct tsif_chrdev *the_dev = filp->private_data;
tsif_get_state(the_dev->cookie, &the_dev->ri, &the_dev->wi,
&the_dev->state);
/* consistency check */
if (the_dev->ri != (the_dev->rptr / TSIF_PKT_SIZE)) {
dev_err(the_dev->dev,
"%s: inconsistent read pointers: ri %d rptr %d\n",
__func__, the_dev->ri, the_dev->rptr);
the_dev->rptr = the_dev->ri * TSIF_PKT_SIZE;
}
/* ri == wi if no data */
if (the_dev->ri == the_dev->wi) {
/* shall I block waiting for data? */
if (filp->f_flags & O_NONBLOCK) {
if (the_dev->state == tsif_state_running) {
return -EAGAIN;
} else {
/* not running -> EOF */
return 0;
}
}
#if 0
if (wait_event_interruptible(the_dev->wq_read,
(the_dev->ri != the_dev->wi) ||
(the_dev->state != tsif_state_running))) {
/* got signal -> tell FS to handle it */
return -ERESTARTSYS;
}
#else
if (wait_event_interruptible_timeout(the_dev->wq_read,
((the_dev->ri != the_dev->wi) ||
(the_dev->state != tsif_state_running)),msecs_to_jiffies(50))) {
/* got signal -> tell FS to handle it */
return -ERESTARTSYS;
}
#endif
if (the_dev->ri == the_dev->wi) {
/* still no data -> EOF */
return 0;
}
}
/* contiguous chunk last up to wi or end of buffer */
wi = (the_dev->wi > the_dev->ri) ?
the_dev->wi : the_dev->buf_size_packets;
avail = min(wi * TSIF_PKT_SIZE - the_dev->rptr, count);
#ifdef FEATURE_TSIF_DEBUG_MSG
pr_info("[%s] size [%d] !!!!!!!\n", __func__, avail);
#endif
//if (copy_to_user(buf, the_dev->data_buffer + the_dev->rptr, avail))
// return -EFAULT;
#ifdef CONFIG_SKY_TDMB_TSIF_IF
tdmb_tsif_data_parser(buf, the_dev->data_buffer + the_dev->rptr, avail);
#endif
the_dev->rptr = (the_dev->rptr + avail) %
(TSIF_PKT_SIZE * the_dev->buf_size_packets);
the_dev->ri = the_dev->rptr / TSIF_PKT_SIZE;
*f_pos += avail;
tsif_reclaim_packets(the_dev->cookie, the_dev->ri);
return avail;
}
