dmxdev.c

linux内核源码

		} else {
			dvb_dmxdev_feed_stop(filter);
		}

		ret = (*secfeed)->allocate_filter(*secfeed, secfilter);
		if (ret < 0) {
			dvb_dmxdev_feed_restart(filter);
			filter->feed.sec->start_filtering(*secfeed);
			dprintk("could not get filter\n");
			return ret;
		}

		(*secfilter)->priv = filter;

		memcpy(&((*secfilter)->filter_value[3]),
		       &(para->filter.filter[1]), DMX_FILTER_SIZE - 1);
		memcpy(&(*secfilter)->filter_mask[3],
		       &para->filter.mask[1], DMX_FILTER_SIZE - 1);
		memcpy(&(*secfilter)->filter_mode[3],
		       &para->filter.mode[1], DMX_FILTER_SIZE - 1);

		(*secfilter)->filter_value[0] = para->filter.filter[0];
		(*secfilter)->filter_mask[0] = para->filter.mask[0];
		(*secfilter)->filter_mode[0] = para->filter.mode[0];
		(*secfilter)->filter_mask[1] = 0;
		(*secfilter)->filter_mask[2] = 0;

		filter->todo = 0;

		ret = filter->feed.sec->start_filtering(filter->feed.sec);
		if (ret < 0)
			return ret;

		dvb_dmxdev_filter_timer(filter);
		break;
	}
	case DMXDEV_TYPE_PES:
	{
		struct timespec timeout = { 0 };
		struct dmx_pes_filter_params *para = &filter->params.pes;
		dmx_output_t otype;
		int ret;
		int ts_type;
		enum dmx_ts_pes ts_pes;
		struct dmx_ts_feed **tsfeed = &filter->feed.ts;

		filter->feed.ts = NULL;
		otype = para->output;

		ts_pes = (enum dmx_ts_pes)para->pes_type;

		if (ts_pes < DMX_PES_OTHER)
			ts_type = TS_DECODER;
		else
			ts_type = 0;

		if (otype == DMX_OUT_TS_TAP)
			ts_type |= TS_PACKET;

		if (otype == DMX_OUT_TAP)
			ts_type |= TS_PAYLOAD_ONLY | TS_PACKET;

		ret = dmxdev->demux->allocate_ts_feed(dmxdev->demux,
						      tsfeed,
						      dvb_dmxdev_ts_callback);
		if (ret < 0)
			return ret;

		(*tsfeed)->priv = filter;

		ret = (*tsfeed)->set(*tsfeed, para->pid, ts_type, ts_pes,
				     32768, timeout);
		if (ret < 0) {
			dmxdev->demux->release_ts_feed(dmxdev->demux,
						       *tsfeed);
			return ret;
		}

		ret = filter->feed.ts->start_filtering(filter->feed.ts);
		if (ret < 0) {
			dmxdev->demux->release_ts_feed(dmxdev->demux,
						       *tsfeed);
			return ret;
		}

		break;
	}
	default:
		return -EINVAL;
	}

	dvb_dmxdev_filter_state_set(filter, DMXDEV_STATE_GO);
	return 0;
}

static int dvb_demux_open(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dmxdev *dmxdev = dvbdev->priv;
	int i;
	struct dmxdev_filter *dmxdevfilter;

	if (!dmxdev->filter)
		return -EINVAL;

	if (mutex_lock_interruptible(&dmxdev->mutex))
		return -ERESTARTSYS;

	for (i = 0; i < dmxdev->filternum; i++)
		if (dmxdev->filter[i].state == DMXDEV_STATE_FREE)
			break;

	if (i == dmxdev->filternum) {
		mutex_unlock(&dmxdev->mutex);
		return -EMFILE;
	}

	dmxdevfilter = &dmxdev->filter[i];
	mutex_init(&dmxdevfilter->mutex);
	file->private_data = dmxdevfilter;

	dvb_ringbuffer_init(&dmxdevfilter->buffer, NULL, 8192);
	dmxdevfilter->type = DMXDEV_TYPE_NONE;
	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_ALLOCATED);
	dmxdevfilter->feed.ts = NULL;
	init_timer(&dmxdevfilter->timer);

	dvbdev->users++;

	mutex_unlock(&dmxdev->mutex);
	return 0;
}

static int dvb_dmxdev_filter_free(struct dmxdev *dmxdev,
				  struct dmxdev_filter *dmxdevfilter)
{
	mutex_lock(&dmxdev->mutex);
	mutex_lock(&dmxdevfilter->mutex);

	dvb_dmxdev_filter_stop(dmxdevfilter);
	dvb_dmxdev_filter_reset(dmxdevfilter);

	if (dmxdevfilter->buffer.data) {
		void *mem = dmxdevfilter->buffer.data;

		spin_lock_irq(&dmxdev->lock);
		dmxdevfilter->buffer.data = NULL;
		spin_unlock_irq(&dmxdev->lock);
		vfree(mem);
	}

	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_FREE);
	wake_up(&dmxdevfilter->buffer.queue);
	mutex_unlock(&dmxdevfilter->mutex);
	mutex_unlock(&dmxdev->mutex);
	return 0;
}

static inline void invert_mode(dmx_filter_t *filter)
{
	int i;

	for (i = 0; i < DMX_FILTER_SIZE; i++)
		filter->mode[i] ^= 0xff;
}

static int dvb_dmxdev_filter_set(struct dmxdev *dmxdev,
				 struct dmxdev_filter *dmxdevfilter,
				 struct dmx_sct_filter_params *params)
{
	dprintk("function : %s\n", __FUNCTION__);

	dvb_dmxdev_filter_stop(dmxdevfilter);

	dmxdevfilter->type = DMXDEV_TYPE_SEC;
	memcpy(&dmxdevfilter->params.sec,
	       params, sizeof(struct dmx_sct_filter_params));
	invert_mode(&dmxdevfilter->params.sec.filter);
	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);

	if (params->flags & DMX_IMMEDIATE_START)
		return dvb_dmxdev_filter_start(dmxdevfilter);

	return 0;
}

static int dvb_dmxdev_pes_filter_set(struct dmxdev *dmxdev,
				     struct dmxdev_filter *dmxdevfilter,
				     struct dmx_pes_filter_params *params)
{
	dvb_dmxdev_filter_stop(dmxdevfilter);

	if (params->pes_type > DMX_PES_OTHER || params->pes_type < 0)
		return -EINVAL;

	dmxdevfilter->type = DMXDEV_TYPE_PES;
	memcpy(&dmxdevfilter->params, params,
	       sizeof(struct dmx_pes_filter_params));

	dvb_dmxdev_filter_state_set(dmxdevfilter, DMXDEV_STATE_SET);

	if (params->flags & DMX_IMMEDIATE_START)
		return dvb_dmxdev_filter_start(dmxdevfilter);

	return 0;
}

static ssize_t dvb_dmxdev_read_sec(struct dmxdev_filter *dfil,
				   struct file *file, char __user *buf,
				   size_t count, loff_t *ppos)
{
	int result, hcount;
	int done = 0;

	if (dfil->todo <= 0) {
		hcount = 3 + dfil->todo;
		if (hcount > count)
			hcount = count;
		result = dvb_dmxdev_buffer_read(&dfil->buffer,
						file->f_flags & O_NONBLOCK,
						buf, hcount, ppos);
		if (result < 0) {
			dfil->todo = 0;
			return result;
		}
		if (copy_from_user(dfil->secheader - dfil->todo, buf, result))
			return -EFAULT;
		buf += result;
		done = result;
		count -= result;
		dfil->todo -= result;
		if (dfil->todo > -3)
			return done;
		dfil->todo = ((dfil->secheader[1] << 8) | dfil->secheader[2]) & 0xfff;
		if (!count)
			return done;
	}
	if (count > dfil->todo)
		count = dfil->todo;
	result = dvb_dmxdev_buffer_read(&dfil->buffer,
					file->f_flags & O_NONBLOCK,
					buf, count, ppos);
	if (result < 0)
		return result;
	dfil->todo -= result;
	return (result + done);
}

static ssize_t
dvb_demux_read(struct file *file, char __user *buf, size_t count,
	       loff_t *ppos)
{
	struct dmxdev_filter *dmxdevfilter = file->private_data;
	int ret;

	if (mutex_lock_interruptible(&dmxdevfilter->mutex))
		return -ERESTARTSYS;

	if (dmxdevfilter->type == DMXDEV_TYPE_SEC)
		ret = dvb_dmxdev_read_sec(dmxdevfilter, file, buf, count, ppos);
	else
		ret = dvb_dmxdev_buffer_read(&dmxdevfilter->buffer,
					     file->f_flags & O_NONBLOCK,
					     buf, count, ppos);

	mutex_unlock(&dmxdevfilter->mutex);
	return ret;
}

static int dvb_demux_do_ioctl(struct inode *inode, struct file *file,
			      unsigned int cmd, void *parg)
{
	struct dmxdev_filter *dmxdevfilter = file->private_data;
	struct dmxdev *dmxdev = dmxdevfilter->dev;
	unsigned long arg = (unsigned long)parg;
	int ret = 0;

	if (mutex_lock_interruptible(&dmxdev->mutex))
		return -ERESTARTSYS;

	switch (cmd) {
	case DMX_START:
		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
			mutex_unlock(&dmxdev->mutex);
			return -ERESTARTSYS;
		}
		if (dmxdevfilter->state < DMXDEV_STATE_SET)
			ret = -EINVAL;
		else
			ret = dvb_dmxdev_filter_start(dmxdevfilter);
		mutex_unlock(&dmxdevfilter->mutex);
		break;

	case DMX_STOP:
		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
			mutex_unlock(&dmxdev->mutex);
			return -ERESTARTSYS;
		}
		ret = dvb_dmxdev_filter_stop(dmxdevfilter);
		mutex_unlock(&dmxdevfilter->mutex);
		break;

	case DMX_SET_FILTER:
		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
			mutex_unlock(&dmxdev->mutex);
			return -ERESTARTSYS;
		}
		ret = dvb_dmxdev_filter_set(dmxdev, dmxdevfilter, parg);
		mutex_unlock(&dmxdevfilter->mutex);
		break;

	case DMX_SET_PES_FILTER:
		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
			mutex_unlock(&dmxdev->mutex);
			return -ERESTARTSYS;
		}
		ret = dvb_dmxdev_pes_filter_set(dmxdev, dmxdevfilter, parg);
		mutex_unlock(&dmxdevfilter->mutex);
		break;

	case DMX_SET_BUFFER_SIZE:
		if (mutex_lock_interruptible(&dmxdevfilter->mutex)) {
			mutex_unlock(&dmxdev->mutex);
			return -ERESTARTSYS;
		}
		ret = dvb_dmxdev_set_buffer_size(dmxdevfilter, arg);
		mutex_unlock(&dmxdevfilter->mutex);
		break;

	case DMX_GET_PES_PIDS:
		if (!dmxdev->demux->get_pes_pids) {
			ret = -EINVAL;
			break;
		}
		dmxdev->demux->get_pes_pids(dmxdev->demux, parg);
		break;

	case DMX_GET_CAPS:
		if (!dmxdev->demux->get_caps) {
			ret = -EINVAL;
			break;
		}
		ret = dmxdev->demux->get_caps(dmxdev->demux, parg);
		break;

	case DMX_SET_SOURCE:
		if (!dmxdev->demux->set_source) {
			ret = -EINVAL;
			break;
		}
		ret = dmxdev->demux->set_source(dmxdev->demux, parg);
		break;

	case DMX_GET_STC:
		if (!dmxdev->demux->get_stc) {
			ret = -EINVAL;
			break;
		}
		ret = dmxdev->demux->get_stc(dmxdev->demux,
					     ((struct dmx_stc *)parg)->num,
					     &((struct dmx_stc *)parg)->stc,
					     &((struct dmx_stc *)parg)->base);
		break;

	default:
		ret = -EINVAL;
		break;
	}
	mutex_unlock(&dmxdev->mutex);
	return ret;
}

static int dvb_demux_ioctl(struct inode *inode, struct file *file,
			   unsigned int cmd, unsigned long arg)
{
	return dvb_usercopy(inode, file, cmd, arg, dvb_demux_do_ioctl);
}

static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
{
	struct dmxdev_filter *dmxdevfilter = file->private_data;
	unsigned int mask = 0;

	if (!dmxdevfilter)
		return -EINVAL;

	poll_wait(file, &dmxdevfilter->buffer.queue, wait);

	if (dmxdevfilter->state != DMXDEV_STATE_GO &&
	    dmxdevfilter->state != DMXDEV_STATE_DONE &&
	    dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
		return 0;

	if (dmxdevfilter->buffer.error)
		mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);

	if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
		mask |= (POLLIN | POLLRDNORM | POLLPRI);

	return mask;
}

static int dvb_demux_release(struct inode *inode, struct file *file)
{
	struct dmxdev_filter *dmxdevfilter = file->private_data;
	struct dmxdev *dmxdev = dmxdevfilter->dev;

	int ret;

	ret = dvb_dmxdev_filter_free(dmxdev, dmxdevfilter);

	mutex_lock(&dmxdev->mutex);
	dmxdev->dvbdev->users--;
	if(dmxdev->dvbdev->users==1 && dmxdev->exit==1) {
		fops_put(file->f_op);
		file->f_op = NULL;
		mutex_unlock(&dmxdev->mutex);
		wake_up(&dmxdev->dvbdev->wait_queue);
	} else
		mutex_unlock(&dmxdev->mutex);

	return ret;
}

static struct file_operations dvb_demux_fops = {
	.owner = THIS_MODULE,
	.read = dvb_demux_read,
	.ioctl = dvb_demux_ioctl,
	.open = dvb_demux_open,
	.release = dvb_demux_release,
	.poll = dvb_demux_poll,
};

static struct dvb_device dvbdev_demux = {
	.priv = NULL,
	.users = 1,
	.writers = 1,
	.fops = &dvb_demux_fops
};

static int dvb_dvr_do_ioctl(struct inode *inode, struct file *file,
			    unsigned int cmd, void *parg)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dmxdev *dmxdev = dvbdev->priv;
	int ret;

	if (mutex_lock_interruptible(&dmxdev->mutex))
		return -ERESTARTSYS;

	switch (cmd) {
	case DMX_SET_BUFFER_SIZE:
		// FIXME: implement
		ret = 0;
		break;

	default:
		ret = -EINVAL;
		break;
	}
	mutex_unlock(&dmxdev->mutex);
	return ret;
}

static int dvb_dvr_ioctl(struct inode *inode, struct file *file,
			 unsigned int cmd, unsigned long arg)
{
	return dvb_usercopy(inode, file, cmd, arg, dvb_dvr_do_ioctl);
}

static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dmxdev *dmxdev = dvbdev->priv;
	unsigned int mask = 0;

	dprintk("function : %s\n", __FUNCTION__);

	poll_wait(file, &dmxdev->dvr_buffer.queue, wait);

	if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
		if (dmxdev->dvr_buffer.error)
			mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);

		if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
			mask |= (POLLIN | POLLRDNORM | POLLPRI);
	} else
		mask |= (POLLOUT | POLLWRNORM | POLLPRI);

	return mask;
}

static struct file_operations dvb_dvr_fops = {
	.owner = THIS_MODULE,
	.read = dvb_dvr_read,
	.write = dvb_dvr_write,
	.ioctl = dvb_dvr_ioctl,
	.open = dvb_dvr_open,
	.release = dvb_dvr_release,
	.poll = dvb_dvr_poll,
};

static struct dvb_device dvbdev_dvr = {
	.priv = NULL,
	.readers = 1,
	.users = 1,
	.fops = &dvb_dvr_fops
};

int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb_adapter *dvb_adapter)
{
	int i;

	if (dmxdev->demux->open(dmxdev->demux) < 0)
		return -EUSERS;

	dmxdev->filter = vmalloc(dmxdev->filternum * sizeof(struct dmxdev_filter));
	if (!dmxdev->filter)
		return -ENOMEM;

	mutex_init(&dmxdev->mutex);
	spin_lock_init(&dmxdev->lock);
	for (i = 0; i < dmxdev->filternum; i++) {
		dmxdev->filter[i].dev = dmxdev;
		dmxdev->filter[i].buffer.data = NULL;
		dvb_dmxdev_filter_state_set(&dmxdev->filter[i],
					    DMXDEV_STATE_FREE);
	}

	dvb_register_device(dvb_adapter, &dmxdev->dvbdev, &dvbdev_demux, dmxdev,
			    DVB_DEVICE_DEMUX);
	dvb_register_device(dvb_adapter, &dmxdev->dvr_dvbdev, &dvbdev_dvr,
			    dmxdev, DVB_DEVICE_DVR);

	dvb_ringbuffer_init(&dmxdev->dvr_buffer, NULL, 8192);

	return 0;
}

EXPORT_SYMBOL(dvb_dmxdev_init);

void dvb_dmxdev_release(struct dmxdev *dmxdev)
{
	dmxdev->exit=1;
	if (dmxdev->dvbdev->users > 1) {
		wait_event(dmxdev->dvbdev->wait_queue,
				dmxdev->dvbdev->users==1);
	}
	if (dmxdev->dvr_dvbdev->users > 1) {
		wait_event(dmxdev->dvr_dvbdev->wait_queue,
				dmxdev->dvr_dvbdev->users==1);
	}

	dvb_unregister_device(dmxdev->dvbdev);
	dvb_unregister_device(dmxdev->dvr_dvbdev);

	vfree(dmxdev->filter);
	dmxdev->filter = NULL;
	dmxdev->demux->close(dmxdev->demux);
}

EXPORT_SYMBOL(dvb_dmxdev_release);