+/* ------------------------------------------------------------------
+ DMA and thread functions
+ ------------------------------------------------------------------*/
+
+/*
+ * Announces that a buffer were filled and request the next
+ */
+static inline void buffer_filled(struct em28xx *dev,
+ struct em28xx_dmaqueue *dma_q,
+ struct em28xx_buffer *buf)
+{
+ /* Advice that buffer was filled */
+ em28xx_isocdbg("[%p/%d] wakeup\n", buf, buf->vb.i);
+ buf->vb.state = VIDEOBUF_DONE;
+ buf->vb.field_count++;
+ do_gettimeofday(&buf->vb.ts);
+
+ dev->isoc_ctl.buf = NULL;
+
+ list_del(&buf->vb.queue);
+ wake_up(&buf->vb.done);
+}
+
+/*
+ * Identify the buffer header type and properly handles
+ */
+static void em28xx_copy_video(struct em28xx *dev,
+ struct em28xx_dmaqueue *dma_q,
+ struct em28xx_buffer *buf,
+ unsigned char *p,
+ unsigned char *outp, unsigned long len)
+{
+ void *fieldstart, *startwrite, *startread;
+ int linesdone, currlinedone, offset, lencopy, remain;
+ int bytesperline = dev->width << 1;
+
+ if (dma_q->pos + len > buf->vb.size)
+ len = buf->vb.size - dma_q->pos;
+
+ if (p[0] != 0x88 && p[0] != 0x22) {
+ em28xx_isocdbg("frame is not complete\n");
+ len += 4;
+ } else
+ p += 4;
+
+ startread = p;
+ remain = len;
+
+ /* Interlaces frame */
+ if (buf->top_field)
+ fieldstart = outp;
+ else
+ fieldstart = outp + bytesperline;
+
+ linesdone = dma_q->pos / bytesperline;
+ currlinedone = dma_q->pos % bytesperline;
+ offset = linesdone * bytesperline * 2 + currlinedone;
+ startwrite = fieldstart + offset;
+ lencopy = bytesperline - currlinedone;
+ lencopy = lencopy > remain ? remain : lencopy;
+
+ if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
+ em28xx_isocdbg("Overflow of %zi bytes past buffer end (1)\n",
+ ((char *)startwrite + lencopy) -
+ ((char *)outp + buf->vb.size));
+ lencopy = remain = (char *)outp + buf->vb.size - (char *)startwrite;
+ }
+ if (lencopy <= 0)
+ return;
+ memcpy(startwrite, startread, lencopy);
+
+ remain -= lencopy;
+
+ while (remain > 0) {
+ startwrite += lencopy + bytesperline;
+ startread += lencopy;
+ if (bytesperline > remain)
+ lencopy = remain;
+ else
+ lencopy = bytesperline;
+
+ if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
+ em28xx_isocdbg("Overflow of %zi bytes past buffer end (2)\n",
+ ((char *)startwrite + lencopy) -
+ ((char *)outp + buf->vb.size));
+ lencopy = remain = (char *)outp + buf->vb.size -
+ (char *)startwrite;
+ }
+ if (lencopy <= 0)
+ break;
+
+ memcpy(startwrite, startread, lencopy);
+
+ remain -= lencopy;
+ }
+
+ dma_q->pos += len;
+}
+
+static inline void print_err_status(struct em28xx *dev,
+ int packet, int status)
+{
+ char *errmsg = "Unknown";
+
+ switch (status) {
+ case -ENOENT:
+ errmsg = "unlinked synchronuously";
+ break;
+ case -ECONNRESET:
+ errmsg = "unlinked asynchronuously";
+ break;
+ case -ENOSR:
+ errmsg = "Buffer error (overrun)";
+ break;
+ case -EPIPE:
+ errmsg = "Stalled (device not responding)";
+ break;
+ case -EOVERFLOW:
+ errmsg = "Babble (bad cable?)";
+ break;
+ case -EPROTO:
+ errmsg = "Bit-stuff error (bad cable?)";
+ break;
+ case -EILSEQ:
+ errmsg = "CRC/Timeout (could be anything)";
+ break;
+ case -ETIME:
+ errmsg = "Device does not respond";
+ break;
+ }
+ if (packet < 0) {
+ em28xx_isocdbg("URB status %d [%s].\n", status, errmsg);
+ } else {
+ em28xx_isocdbg("URB packet %d, status %d [%s].\n",
+ packet, status, errmsg);
+ }
+}
+
+/*
+ * video-buf generic routine to get the next available buffer
+ */
+static inline void get_next_buf(struct em28xx_dmaqueue *dma_q,
+ struct em28xx_buffer **buf)
+{
+ struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
+ char *outp;
+
+ if (list_empty(&dma_q->active)) {
+ em28xx_isocdbg("No active queue to serve\n");
+ dev->isoc_ctl.buf = NULL;
+ *buf = NULL;
+ return;
+ }
+
+ /* Get the next buffer */
+ *buf = list_entry(dma_q->active.next, struct em28xx_buffer, vb.queue);
+
+ /* Cleans up buffer - Usefull for testing for frame/URB loss */
+ outp = videobuf_to_vmalloc(&(*buf)->vb);
+ memset(outp, 0, (*buf)->vb.size);
+
+ dev->isoc_ctl.buf = *buf;
+
+ return;
+}
+
+/*
+ * Controls the isoc copy of each urb packet
+ */
+static inline int em28xx_isoc_copy(struct em28xx *dev, struct urb *urb)
+{
+ struct em28xx_buffer *buf;
+ struct em28xx_dmaqueue *dma_q = urb->context;
+ unsigned char *outp = NULL;
+ int i, len = 0, rc = 1;
+ unsigned char *p;
+
+ if (!dev)
+ return 0;
+
+ if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
+ return 0;
+
+ if (urb->status < 0) {
+ print_err_status(dev, -1, urb->status);
+ if (urb->status == -ENOENT)
+ return 0;
+ }
+
+ buf = dev->isoc_ctl.buf;
+ if (buf != NULL)
+ outp = videobuf_to_vmalloc(&buf->vb);
+
+ for (i = 0; i < urb->number_of_packets; i++) {
+ int status = urb->iso_frame_desc[i].status;
+
+ if (status < 0) {
+ print_err_status(dev, i, status);
+ if (urb->iso_frame_desc[i].status != -EPROTO)
+ continue;
+ }
+
+ len = urb->iso_frame_desc[i].actual_length - 4;
+
+ if (urb->iso_frame_desc[i].actual_length <= 0) {
+ /* em28xx_isocdbg("packet %d is empty",i); - spammy */
+ continue;
+ }
+ if (urb->iso_frame_desc[i].actual_length >
+ dev->max_pkt_size) {
+ em28xx_isocdbg("packet bigger than packet size");
+ continue;
+ }
+
+ p = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
+
+ /* FIXME: incomplete buffer checks where removed to make
+ logic simpler. Impacts of those changes should be evaluated
+ */
+ if (p[0] == 0x33 && p[1] == 0x95 && p[2] == 0x00) {
+ em28xx_isocdbg("VBI HEADER!!!\n");
+ /* FIXME: Should add vbi copy */
+ continue;
+ }
+ if (p[0] == 0x22 && p[1] == 0x5a) {
+ em28xx_isocdbg("Video frame %d, length=%i, %s\n", p[2],
+ len, (p[2] & 1)? "odd" : "even");
+
+ if (!(p[2] & 1)) {
+ if (buf != NULL)
+ buffer_filled(dev, dma_q, buf);
+ get_next_buf(dma_q, &buf);
+ if (buf == NULL)
+ outp = NULL;
+ else
+ outp = videobuf_to_vmalloc(&buf->vb);
+ }
+
+ if (buf != NULL) {
+ if (p[2] & 1)
+ buf->top_field = 0;
+ else
+ buf->top_field = 1;
+ }
+
+ dma_q->pos = 0;
+ }
+ if (buf != NULL)
+ em28xx_copy_video(dev, dma_q, buf, p, outp, len);
+ }
+ return rc;
+}
+
+/* ------------------------------------------------------------------
+ Videobuf operations
+ ------------------------------------------------------------------*/
+
+static int
+buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
+{
+ struct em28xx_fh *fh = vq->priv_data;
+ struct em28xx *dev = fh->dev;
+ struct v4l2_frequency f;
+
+ *size = 16 * fh->dev->width * fh->dev->height >> 3;
+ if (0 == *count)
+ *count = EM28XX_DEF_BUF;
+
+ if (*count < EM28XX_MIN_BUF)
+ *count = EM28XX_MIN_BUF;
+
+ /* Ask tuner to go to analog mode */
+ memset(&f, 0, sizeof(f));
+ f.frequency = dev->ctl_freq;
+
+ em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
+
+ return 0;
+}
+
+/* This is called *without* dev->slock held; please keep it that way */
+static void free_buffer(struct videobuf_queue *vq, struct em28xx_buffer *buf)
+{
+ struct em28xx_fh *fh = vq->priv_data;
+ struct em28xx *dev = fh->dev;
+ unsigned long flags = 0;
+ if (in_interrupt())
+ BUG();
+
+ /* We used to wait for the buffer to finish here, but this didn't work
+ because, as we were keeping the state as VIDEOBUF_QUEUED,
+ videobuf_queue_cancel marked it as finished for us.
+ (Also, it could wedge forever if the hardware was misconfigured.)
+
+ This should be safe; by the time we get here, the buffer isn't
+ queued anymore. If we ever start marking the buffers as
+ VIDEOBUF_ACTIVE, it won't be, though.
+ */
+ spin_lock_irqsave(&dev->slock, flags);
+ if (dev->isoc_ctl.buf == buf)
+ dev->isoc_ctl.buf = NULL;
+ spin_unlock_irqrestore(&dev->slock, flags);
+
+ videobuf_vmalloc_free(&buf->vb);
+ buf->vb.state = VIDEOBUF_NEEDS_INIT;
+}
+
+static int
+buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
+ enum v4l2_field field)
+{
+ struct em28xx_fh *fh = vq->priv_data;
+ struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+ struct em28xx *dev = fh->dev;
+ int rc = 0, urb_init = 0;
+
+ /* FIXME: It assumes depth = 16 */
+ /* The only currently supported format is 16 bits/pixel */
+ buf->vb.size = 16 * dev->width * dev->height >> 3;
+
+ if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
+ return -EINVAL;
+
+ buf->vb.width = dev->width;
+ buf->vb.height = dev->height;
+ buf->vb.field = field;
+
+ if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
+ rc = videobuf_iolock(vq, &buf->vb, NULL);
+ if (rc < 0)
+ goto fail;
+ }
+
+ if (!dev->isoc_ctl.num_bufs)
+ urb_init = 1;
+
+ if (urb_init) {
+ rc = em28xx_init_isoc(dev, EM28XX_NUM_PACKETS,
+ EM28XX_NUM_BUFS, dev->max_pkt_size,
+ em28xx_isoc_copy);
+ if (rc < 0)
+ goto fail;
+ }
+
+ buf->vb.state = VIDEOBUF_PREPARED;
+ return 0;
+
+fail:
+ free_buffer(vq, buf);
+ return rc;
+}
+
+static void
+buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
+{
+ struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+ struct em28xx_fh *fh = vq->priv_data;
+ struct em28xx *dev = fh->dev;
+ struct em28xx_dmaqueue *vidq = &dev->vidq;
+
+ buf->vb.state = VIDEOBUF_QUEUED;
+ list_add_tail(&buf->vb.queue, &vidq->active);
+
+}
+
+static void buffer_release(struct videobuf_queue *vq,
+ struct videobuf_buffer *vb)
+{
+ struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+ struct em28xx_fh *fh = vq->priv_data;
+ struct em28xx *dev = (struct em28xx *)fh->dev;
+
+ em28xx_isocdbg("em28xx: called buffer_release\n");
+
+ free_buffer(vq, buf);
+}
+
+static struct videobuf_queue_ops em28xx_video_qops = {
+ .buf_setup = buffer_setup,
+ .buf_prepare = buffer_prepare,
+ .buf_queue = buffer_queue,
+ .buf_release = buffer_release,
+};