V4L/DVB (12742): em28xx: add raw VBI support for NTSC

Add support for raw VBI capture for the em28xx bridge, currently only for
NTSC.  Support for PAL capture to follow shortly (including the removal of
numerous hard-coded NTSC-specific sizes for capture buffers, etc).

Note that the code currently changes the default current norm from PAL to
NTSC (so that zvbi-ntsc-cc works properly).  The default norm really should
be moved into a board-level parameter.

This work was sponsored by EyeMagnet Limited.

Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 266 insertions, 24 deletions

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 04c9ecc3c22..7022f7ba61b 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -163,7 +163,24 @@ static inline void buffer_filled(struct em28xx *dev,
 	buf->vb.field_count++;
 	do_gettimeofday(&buf->vb.ts);
 
-	dev->isoc_ctl.buf = NULL;
+	dev->isoc_ctl.vid_buf = NULL;
+
+	list_del(&buf->vb.queue);
+	wake_up(&buf->vb.done);
+}
+
+static inline void vbi_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.vbi_buf = NULL;
 
 	list_del(&buf->vb.queue);
 	wake_up(&buf->vb.done);
@@ -256,6 +273,63 @@ static void em28xx_copy_video(struct em28xx *dev,
 	dma_q->pos += len;
 }
 
+static void em28xx_copy_vbi(struct em28xx *dev,
+			      struct em28xx_dmaqueue  *dma_q,
+			      struct em28xx_buffer *buf,
+			      unsigned char *p,
+			      unsigned char *outp, unsigned long len)
+{
+	void *startwrite, *startread;
+	int  offset;
+	int bytesperline = 720;
+
+	if (dev == NULL) {
+		printk("dev is null\n");
+		return;
+	}
+
+	if (dma_q == NULL) {
+		printk("dma_q is null\n");
+		return;
+	}
+	if (buf == NULL) {
+		return;
+	}
+	if (p == NULL) {
+		printk("p is null\n");
+		return;
+	}
+	if (outp == NULL) {
+		printk("outp is null\n");
+		return;
+	}
+
+	if (dma_q->pos + len > buf->vb.size)
+		len = buf->vb.size - dma_q->pos;
+
+	if ((p[0] == 0x33 && p[1] == 0x95) ||
+	    (p[0] == 0x88 && p[1] == 0x88)) {
+		/* Header field, advance past it */
+		p += 4;
+	} else {
+		len += 4;
+	}
+
+	startread = p;
+
+	startwrite = outp + dma_q->pos;
+	offset = dma_q->pos;
+
+	/* Make sure the bottom field populates the second half of the frame */
+	if (buf->top_field == 0) {
+		startwrite += bytesperline * 0x0c;
+		offset += bytesperline * 0x0c;
+	}
+
+	memcpy(startwrite, startread, len);
+	dma_q->pos += len;
+}
+
 static inline void print_err_status(struct em28xx *dev,
 				     int packet, int status)
 {
@@ -306,7 +380,7 @@ static inline void get_next_buf(struct em28xx_dmaqueue *dma_q,
 
 	if (list_empty(&dma_q->active)) {
 		em28xx_isocdbg("No active queue to serve\n");
-		dev->isoc_ctl.buf = NULL;
+		dev->isoc_ctl.vid_buf = NULL;
 		*buf = NULL;
 		return;
 	}
@@ -318,7 +392,34 @@ static inline void get_next_buf(struct em28xx_dmaqueue *dma_q,
 	outp = videobuf_to_vmalloc(&(*buf)->vb);
 	memset(outp, 0, (*buf)->vb.size);
 
-	dev->isoc_ctl.buf = *buf;
+	dev->isoc_ctl.vid_buf = *buf;
+
+	return;
+}
+
+/*
+ * video-buf generic routine to get the next available VBI buffer
+ */
+static inline void vbi_get_next_buf(struct em28xx_dmaqueue *dma_q,
+				    struct em28xx_buffer **buf)
+{
+	struct em28xx *dev = container_of(dma_q, struct em28xx, vbiq);
+	char *outp;
+
+	if (list_empty(&dma_q->active)) {
+		em28xx_isocdbg("No active queue to serve\n");
+		dev->isoc_ctl.vbi_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, 0x00, (*buf)->vb.size);
+
+	dev->isoc_ctl.vbi_buf = *buf;
 
 	return;
 }
@@ -346,7 +447,7 @@ static inline int em28xx_isoc_copy(struct em28xx *dev, struct urb *urb)
 			return 0;
 	}
 
-	buf = dev->isoc_ctl.buf;
+	buf = dev->isoc_ctl.vid_buf;
 	if (buf != NULL)
 		outp = videobuf_to_vmalloc(&buf->vb);
 
@@ -416,6 +517,7 @@ static inline int em28xx_isoc_copy_vbi(struct em28xx *dev, struct urb *urb)
 {
 	struct em28xx_buffer    *buf, *vbi_buf;
 	struct em28xx_dmaqueue  *dma_q = &dev->vidq;
+	struct em28xx_dmaqueue  *vbi_dma_q = &dev->vbiq;
 	unsigned char *outp = NULL;
 	unsigned char *vbioutp = NULL;
 	int i, len = 0, rc = 1;
@@ -434,9 +536,14 @@ static inline int em28xx_isoc_copy_vbi(struct em28xx *dev, struct urb *urb)
 			return 0;
 	}
 
-	buf = dev->isoc_ctl.buf;
+	buf = dev->isoc_ctl.vid_buf;
 	if (buf != NULL)
 		outp = videobuf_to_vmalloc(&buf->vb);
+
+	vbi_buf = dev->isoc_ctl.vbi_buf;
+	if (vbi_buf != NULL)
+		vbioutp = videobuf_to_vmalloc(&vbi_buf->vb);
+
 	for (i = 0; i < urb->number_of_packets; i++) {
 		int status = urb->iso_frame_desc[i].status;
 
@@ -480,12 +587,41 @@ static inline int em28xx_isoc_copy_vbi(struct em28xx *dev, struct urb *urb)
 				printk("djh c should never happen\n");
 			} else if ((dev->vbi_read + len) < vbi_size) {
 				/* This entire frame is VBI data */
+				if (dev->vbi_read == 0 &&
+				    (!(dev->cur_field & 1))) {
+					/* Brand new frame */
+					if (vbi_buf != NULL)
+						vbi_buffer_filled(dev,
+								  vbi_dma_q,
+								  vbi_buf);
+					vbi_get_next_buf(vbi_dma_q, &vbi_buf);
+					if (vbi_buf == NULL)
+						vbioutp = NULL;
+					else {
+						vbioutp = videobuf_to_vmalloc(&vbi_buf->vb);
+					}
+				}
+
+				if (dev->vbi_read == 0) {
+					vbi_dma_q->pos = 0;
+					if (vbi_buf != NULL) {
+						if (dev->cur_field & 1)
+							vbi_buf->top_field = 0;
+						else
+							vbi_buf->top_field = 1;
+					}
+				}
+
 				dev->vbi_read += len;
+				em28xx_copy_vbi(dev, vbi_dma_q, vbi_buf, p,
+						vbioutp, len);
 			} else {
 				/* Some of this frame is VBI data and some is
 				   video data */
 				int vbi_data_len = vbi_size - dev->vbi_read;
 				dev->vbi_read += vbi_data_len;
+				em28xx_copy_vbi(dev, vbi_dma_q, vbi_buf, p,
+						vbioutp, vbi_data_len);
 				dev->capture_type = 1;
 				p += vbi_data_len;
 				len -= vbi_data_len;
@@ -570,8 +706,8 @@ static void free_buffer(struct videobuf_queue *vq, struct em28xx_buffer *buf)
 	   VIDEOBUF_ACTIVE, it won't be, though.
 	*/
 	spin_lock_irqsave(&dev->slock, flags);
-	if (dev->isoc_ctl.buf == buf)
-		dev->isoc_ctl.buf = NULL;
+	if (dev->isoc_ctl.vid_buf == buf)
+		dev->isoc_ctl.vid_buf = NULL;
 	spin_unlock_irqrestore(&dev->slock, flags);
 
 	videobuf_vmalloc_free(&buf->vb);
@@ -1542,8 +1678,12 @@ static int vidioc_streamon(struct file *file, void *priv,
 	mutex_lock(&dev->lock);
 	rc = res_get(fh);
 
-	if (likely(rc >= 0))
-		rc = videobuf_streamon(&fh->vb_vidq);
+	if (likely(rc >= 0)) {
+		if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+			rc = videobuf_streamon(&fh->vb_vidq);
+		else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+			rc = videobuf_streamon(&fh->vb_vbiq);
+	}
 
 	mutex_unlock(&dev->lock);
 
@@ -1561,14 +1701,19 @@ static int vidioc_streamoff(struct file *file, void *priv,
 	if (rc < 0)
 		return rc;
 
-	if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
+	if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
+	    fh->type != V4L2_BUF_TYPE_VBI_CAPTURE)
 		return -EINVAL;
 	if (type != fh->type)
 		return -EINVAL;
 
 	mutex_lock(&dev->lock);
 
-	videobuf_streamoff(&fh->vb_vidq);
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		videobuf_streamoff(&fh->vb_vidq);
+	else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+		videobuf_streamoff(&fh->vb_vbiq);
+
 	res_free(fh);
 
 	mutex_unlock(&dev->lock);
@@ -1589,6 +1734,7 @@ static int vidioc_querycap(struct file *file, void  *priv,
 	cap->version = EM28XX_VERSION_CODE;
 
 	cap->capabilities =
+			V4L2_CAP_VBI_CAPTURE |
 			V4L2_CAP_SLICED_VBI_CAPTURE |
 			V4L2_CAP_VIDEO_CAPTURE |
 			V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
@@ -1660,6 +1806,45 @@ static int vidioc_try_set_sliced_vbi_cap(struct file *file, void *priv,
 	return 0;
 }
 
+/* RAW VBI ioctls */
+
+static int vidioc_g_fmt_vbi_cap(struct file *file, void *priv,
+				struct v4l2_format *format)
+{
+	format->fmt.vbi.samples_per_line = 720;
+	format->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
+	format->fmt.vbi.offset = 0;
+	format->fmt.vbi.flags = 0;
+
+	/* Varies by video standard (NTSC, PAL, etc.) */
+	/* FIXME: hard-coded for NTSC support */
+	format->fmt.vbi.sampling_rate = 6750000 * 4 / 2; /* FIXME: ??? */
+	format->fmt.vbi.count[0] = 12;
+	format->fmt.vbi.count[1] = 12;
+	format->fmt.vbi.start[0] = 10;
+	format->fmt.vbi.start[1] = 273;
+
+	return 0;
+}
+
+static int vidioc_s_fmt_vbi_cap(struct file *file, void *priv,
+				struct v4l2_format *format)
+{
+	format->fmt.vbi.samples_per_line = 720;
+	format->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
+	format->fmt.vbi.offset = 0;
+	format->fmt.vbi.flags = 0;
+
+	/* Varies by video standard (NTSC, PAL, etc.) */
+	/* FIXME: hard-coded for NTSC support */
+	format->fmt.vbi.sampling_rate = 6750000 * 4 / 2; /* FIXME: ??? */
+	format->fmt.vbi.count[0] = 12;
+	format->fmt.vbi.count[1] = 12;
+	format->fmt.vbi.start[0] = 10;
+	format->fmt.vbi.start[1] = 273;
+
+	return 0;
+}
 
 static int vidioc_reqbufs(struct file *file, void *priv,
 			  struct v4l2_requestbuffers *rb)
@@ -1672,7 +1857,10 @@ static int vidioc_reqbufs(struct file *file, void *priv,
 	if (rc < 0)
 		return rc;
 
-	return videobuf_reqbufs(&fh->vb_vidq, rb);
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return videobuf_reqbufs(&fh->vb_vidq, rb);
+	else
+		return videobuf_reqbufs(&fh->vb_vbiq, rb);
 }
 
 static int vidioc_querybuf(struct file *file, void *priv,
@@ -1686,7 +1874,18 @@ static int vidioc_querybuf(struct file *file, void *priv,
 	if (rc < 0)
 		return rc;
 
-	return videobuf_querybuf(&fh->vb_vidq, b);
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return videobuf_querybuf(&fh->vb_vidq, b);
+	else {
+		/* FIXME: I'm not sure yet whether this is a bug in zvbi or
+		   the videobuf framework, but we probably shouldn't be
+		   returning a buffer larger than that which was asked for.
+		   At a minimum, it causes a crash in zvbi since it does
+		   a memcpy based on the source buffer length */
+		int result = videobuf_querybuf(&fh->vb_vbiq, b);
+		b->length = 17280;
+		return result;
+	}
 }
 
 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
@@ -1699,7 +1898,11 @@ static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
 	if (rc < 0)
 		return rc;
 
-	return videobuf_qbuf(&fh->vb_vidq, b);
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return videobuf_qbuf(&fh->vb_vidq, b);
+	else {
+		return videobuf_qbuf(&fh->vb_vbiq, b);
+	}
 }
 
 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
@@ -1712,7 +1915,12 @@ static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
 	if (rc < 0)
 		return rc;
 
-	return videobuf_dqbuf(&fh->vb_vidq, b, file->f_flags & O_NONBLOCK);
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return videobuf_dqbuf(&fh->vb_vidq, b, file->f_flags &
+				      O_NONBLOCK);
+	else
+		return videobuf_dqbuf(&fh->vb_vbiq, b, file->f_flags &
+				      O_NONBLOCK);
 }
 
 #ifdef CONFIG_VIDEO_V4L1_COMPAT
@@ -1720,7 +1928,10 @@ static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
 {
 	struct em28xx_fh  *fh = priv;
 
-	return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
+	else
+		return videobuf_cgmbuf(&fh->vb_vbiq, mbuf, 8);
 }
 #endif
 
@@ -1884,9 +2095,17 @@ static int em28xx_v4l2_open(struct file *filp)
 	else
 		field = V4L2_FIELD_INTERLACED;
 
-	videobuf_queue_vmalloc_init(&fh->vb_vidq, &em28xx_video_qops,
-			NULL, &dev->slock, fh->type, field,
-			sizeof(struct em28xx_buffer), fh);
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		videobuf_queue_vmalloc_init(&fh->vb_vidq, &em28xx_video_qops,
+					    NULL, &dev->slock, fh->type, field,
+					    sizeof(struct em28xx_buffer), fh);
+
+	if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+		videobuf_queue_vmalloc_init(&fh->vb_vbiq, &em28xx_vbi_qops,
+					    NULL, &dev->slock,
+					    V4L2_BUF_TYPE_VBI_CAPTURE,
+					    V4L2_FIELD_SEQ_TB,
+					    sizeof(struct em28xx_buffer), fh);
 
 	mutex_unlock(&dev->lock);
 
@@ -1948,7 +2167,7 @@ static int em28xx_v4l2_close(struct file *filp)
 	if (res_check(fh))
 		res_free(fh);
 
-	if (dev->users == 1) {
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 1) {
 		videobuf_stop(&fh->vb_vidq);
 		videobuf_mmap_free(&fh->vb_vidq);
 
@@ -1977,6 +2196,12 @@ static int em28xx_v4l2_close(struct file *filp)
 					"0 (error=%i)\n", errCode);
 		}
 	}
+
+	if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
+		videobuf_stop(&fh->vb_vbiq);
+		videobuf_mmap_free(&fh->vb_vbiq);
+	}
+
 	kfree(fh);
 	dev->users--;
 	wake_up_interruptible_nr(&dev->open, 1);
@@ -2015,6 +2240,17 @@ em28xx_v4l2_read(struct file *filp, char __user *buf, size_t count,
 		return videobuf_read_stream(&fh->vb_vidq, buf, count, pos, 0,
 					filp->f_flags & O_NONBLOCK);
 	}
+
+
+	if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
+		mutex_lock(&dev->lock);
+		rc = res_get(fh);
+		mutex_unlock(&dev->lock);
+
+		return videobuf_read_stream(&fh->vb_vbiq, buf, count, pos, 0,
+					filp->f_flags & O_NONBLOCK);
+	}
+
 	return 0;
 }
 
@@ -2039,10 +2275,12 @@ static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table *wait)
 	if (unlikely(rc < 0))
 		return POLLERR;
 
-	if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
+	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+		return videobuf_poll_stream(filp, &fh->vb_vidq, wait);
+	else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE)
+		return videobuf_poll_stream(filp, &fh->vb_vbiq, wait);
+	else
 		return POLLERR;
-
-	return videobuf_poll_stream(filp, &fh->vb_vidq, wait);
 }
 
 /*
@@ -2091,6 +2329,8 @@ static const struct v4l2_ioctl_ops video_ioctl_ops = {
 	.vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
 	.vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
 	.vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
+	.vidioc_g_fmt_vbi_cap       = vidioc_g_fmt_vbi_cap,
+	.vidioc_s_fmt_vbi_cap       = vidioc_s_fmt_vbi_cap,
 	.vidioc_g_audio             = vidioc_g_audio,
 	.vidioc_s_audio             = vidioc_s_audio,
 	.vidioc_cropcap             = vidioc_cropcap,
@@ -2136,7 +2376,9 @@ static const struct video_device em28xx_video_template = {
 	.minor                      = -1,
 
 	.tvnorms                    = V4L2_STD_ALL,
-	.current_norm               = V4L2_STD_PAL,
+	/* FIXME: we need this to be NTSC for VBI to work - it should
+	   be moved to a per-board definition */
+	.current_norm               = V4L2_STD_NTSC,
 };
 
 static const struct v4l2_file_operations radio_fops = {