/* The user yanked out the cable... */
static void usb_pwc_disconnect(struct usb_interface *intf)
{
struct v4l2_device *v = usb_get_intfdata(intf);
struct pwc_device *pdev = container_of(v, struct pwc_device, v4l2_dev);
mutex_lock(&pdev->vb_queue_lock);
mutex_lock(&pdev->v4l2_lock);
/* No need to keep the urbs around after disconnection */
if (pdev->vb_queue.streaming)
pwc_isoc_cleanup(pdev);
pdev->udev = NULL;
pwc_cleanup_queued_bufs(pdev);
v4l2_device_disconnect(&pdev->v4l2_dev);
video_unregister_device(&pdev->vdev);
mutex_unlock(&pdev->v4l2_lock);
mutex_unlock(&pdev->vb_queue_lock);
#ifdef CONFIG_USB_PWC_INPUT_EVDEV
if (pdev->button_dev)
input_unregister_device(pdev->button_dev);
#endif
v4l2_device_put(&pdev->v4l2_dev);
}
static int stop_streaming(struct vb2_queue *vq)
{
struct pwc_device *pdev = vb2_get_drv_priv(vq);
mutex_lock(&pdev->udevlock);
if (pdev->udev) {
pwc_set_leds(pdev, 0, 0);
pwc_camera_power(pdev, 0);
pwc_isoc_cleanup(pdev);
}
mutex_unlock(&pdev->udevlock);
pwc_cleanup_queued_bufs(pdev);
return 0;
}
static void stop_streaming(struct vb2_queue *vq)
{
struct pwc_device *pdev = vb2_get_drv_priv(vq);
mutex_lock(&pdev->v4l2_lock);
if (pdev->udev) {
pwc_set_leds(pdev, 0, 0);
pwc_camera_power(pdev, 0);
pwc_isoc_cleanup(pdev);
}
pwc_cleanup_queued_bufs(pdev, VB2_BUF_STATE_ERROR);
if (pdev->fill_buf)
vb2_buffer_done(&pdev->fill_buf->vb.vb2_buf,
VB2_BUF_STATE_ERROR);
mutex_unlock(&pdev->v4l2_lock);
}
static int stop_streaming(struct vb2_queue *vq)
{
struct pwc_device *pdev = vb2_get_drv_priv(vq);
if (mutex_lock_interruptible(&pdev->v4l2_lock))
return -ERESTARTSYS;
if (pdev->udev) {
pwc_set_leds(pdev, 0, 0);
pwc_camera_power(pdev, 0);
pwc_isoc_cleanup(pdev);
}
pwc_cleanup_queued_bufs(pdev);
mutex_unlock(&pdev->v4l2_lock);
return 0;
}
/* Both v4l2_lock and vb_queue_lock should be locked when calling this */
static int pwc_isoc_init(struct pwc_device *pdev)
{
struct usb_device *udev;
struct urb *urb;
int i, j, ret;
struct usb_interface *intf;
struct usb_host_interface *idesc = NULL;
int compression = 0; /* 0..3 = uncompressed..high */
pdev->vsync = 0;
pdev->vlast_packet_size = 0;
pdev->fill_buf = NULL;
pdev->vframe_count = 0;
pdev->visoc_errors = 0;
udev = pdev->udev;
retry:
/* We first try with low compression and then retry with a higher
compression setting if there is not enough bandwidth. */
ret = pwc_set_video_mode(pdev, pdev->width, pdev->height, pdev->pixfmt,
pdev->vframes, &compression, 1);
/* Get the current alternate interface, adjust packet size */
intf = usb_ifnum_to_if(udev, 0);
if (intf)
idesc = usb_altnum_to_altsetting(intf, pdev->valternate);
if (!idesc)
return -EIO;
/* Search video endpoint */
pdev->vmax_packet_size = -1;
for (i = 0; i < idesc->desc.bNumEndpoints; i++) {
if ((idesc->endpoint[i].desc.bEndpointAddress & 0xF) == pdev->vendpoint) {
pdev->vmax_packet_size = le16_to_cpu(idesc->endpoint[i].desc.wMaxPacketSize);
break;
}
}
if (pdev->vmax_packet_size < 0 || pdev->vmax_packet_size > ISO_MAX_FRAME_SIZE) {
PWC_ERROR("Failed to find packet size for video endpoint in current alternate setting.\n");
return -ENFILE; /* Odd error, that should be noticeable */
}
/* Set alternate interface */
PWC_DEBUG_OPEN("Setting alternate interface %d\n", pdev->valternate);
ret = usb_set_interface(pdev->udev, 0, pdev->valternate);
if (ret == -ENOSPC && compression < 3) {
compression++;
goto retry;
}
if (ret < 0)
return ret;
/* Allocate and init Isochronuous urbs */
for (i = 0; i < MAX_ISO_BUFS; i++) {
urb = usb_alloc_urb(ISO_FRAMES_PER_DESC, GFP_KERNEL);
if (urb == NULL) {
PWC_ERROR("Failed to allocate urb %d\n", i);
pwc_isoc_cleanup(pdev);
return -ENOMEM;
}
pdev->urbs[i] = urb;
PWC_DEBUG_MEMORY("Allocated URB at 0x%p\n", urb);
urb->interval = 1; // devik
urb->dev = udev;
urb->pipe = usb_rcvisocpipe(udev, pdev->vendpoint);
urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
urb->transfer_buffer = usb_alloc_coherent(udev,
ISO_BUFFER_SIZE,
GFP_KERNEL,
&urb->transfer_dma);
if (urb->transfer_buffer == NULL) {
PWC_ERROR("Failed to allocate urb buffer %d\n", i);
pwc_isoc_cleanup(pdev);
return -ENOMEM;
}
urb->transfer_buffer_length = ISO_BUFFER_SIZE;
urb->complete = pwc_isoc_handler;
urb->context = pdev;
urb->start_frame = 0;
urb->number_of_packets = ISO_FRAMES_PER_DESC;
for (j = 0; j < ISO_FRAMES_PER_DESC; j++) {
urb->iso_frame_desc[j].offset = j * ISO_MAX_FRAME_SIZE;
urb->iso_frame_desc[j].length = pdev->vmax_packet_size;
}
}
/* link */
for (i = 0; i < MAX_ISO_BUFS; i++) {
ret = usb_submit_urb(pdev->urbs[i], GFP_KERNEL);
if (ret == -ENOSPC && compression < 3) {
compression++;
pwc_isoc_cleanup(pdev);
goto retry;
}
if (ret) {
PWC_ERROR("isoc_init() submit_urb %d failed with error %d\n", i, ret);
pwc_isoc_cleanup(pdev);
return ret;
}
PWC_DEBUG_MEMORY("URB 0x%p submitted.\n", pdev->urbs[i]);
}
/* All is done... */
PWC_DEBUG_OPEN("<< pwc_isoc_init()\n");
return 0;
}
