static int stk1160_stop_streaming(struct stk1160 *dev)
{
if (mutex_lock_interruptible(&dev->v4l_lock))
return -ERESTARTSYS;
/*
* Once URBs are cancelled, the URB complete handler
* won't be running. This is required to safely release the
* current buffer (dev->isoc_ctl.buf).
*/
stk1160_cancel_isoc(dev);
/*
* It is possible to keep buffers around using a module parameter.
* This is intended to avoid memory fragmentation.
*/
if (!keep_buffers)
stk1160_free_isoc(dev);
stk1160_stop_hw(dev);
stk1160_clear_queue(dev);
stk1160_dbg("streaming stopped\n");
mutex_unlock(&dev->v4l_lock);
return 0;
}
static int stk1160_stop_streaming(struct stk1160 *dev)
{
if (mutex_lock_interruptible(&dev->v4l_lock))
return -ERESTARTSYS;
stk1160_cancel_isoc(dev);
/*
* It is possible to keep buffers around using a module parameter.
* This is intended to avoid memory fragmentation.
*/
if (!keep_buffers)
stk1160_free_isoc(dev);
stk1160_stop_hw(dev);
stk1160_clear_queue(dev);
stk1160_dbg("streaming stopped\n");
mutex_unlock(&dev->v4l_lock);
return 0;
}
static int stk1160_start_streaming(struct stk1160 *dev)
{
bool new_pkt_size;
int rc = 0;
int i;
/* Check device presence */
if (!dev->udev)
return -ENODEV;
if (mutex_lock_interruptible(&dev->v4l_lock))
return -ERESTARTSYS;
/*
* For some reason it is mandatory to set alternate *first*
* and only *then* initialize isoc urbs.
* Someone please explain me why ;)
*/
new_pkt_size = stk1160_set_alternate(dev);
/*
* We (re)allocate isoc urbs if:
* there is no allocated isoc urbs, OR
* a new dev->max_pkt_size is detected
*/
if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
rc = stk1160_alloc_isoc(dev);
if (rc < 0)
goto out_stop_hw;
}
/* submit urbs and enables IRQ */
for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
if (rc) {
stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
goto out_uninit;
}
}
/* Start saa711x */
v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
/* Start stk1160 */
stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
stk1160_dbg("streaming started\n");
mutex_unlock(&dev->v4l_lock);
return 0;
out_uninit:
stk1160_uninit_isoc(dev);
out_stop_hw:
usb_set_interface(dev->udev, 0, 0);
stk1160_clear_queue(dev);
mutex_unlock(&dev->v4l_lock);
return rc;
}
