V4L/DVB (11266): vino: Remove code for things already done by video_ioctl2

The v4l2-ioctl core only allows buffer types for which the corresponding
->vidioc_try_fmt_xxx() methods are defined to be used in vidioc_(g|s)_parm,
vidioc_(q|dq|query)buf, and vidioc_reqbufs.

Remove buffer type checking from vino_g_parm(), vino_s_parm(),
vino_reqbufs(), vino_querybuf(), vino_qbuf(), and vino_dqbuf().  This
reduced the indent level of the code so a few lines can be wrapped better.
Also fixed the C++ type comments.

The v4l2-ioctl core also provides structs that have been pre-zeroed for all
fields that driver is supposed to fill in, so remove zeroing code from
vino_enum_fmt_vid_cap().  Also, the format index is unsigned so it's not
necessary to check if it's less than zero.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/vino.c

@@ -3102,22 +3102,14 @@ out:
 static int vino_enum_fmt_vid_cap(struct file *file, void *__fh,
 			      struct v4l2_fmtdesc *fd)
 {
-	enum v4l2_buf_type type = fd->type;
-	int index = fd->index;
+	dprintk("format index = %d\n", fd->index);
 
-	dprintk("format index = %d\n", index);
-
-	if ((fd->index < 0) ||
-			(fd->index >= VINO_DATA_FMT_COUNT))
+	if (fd->index >= VINO_DATA_FMT_COUNT)
 		return -EINVAL;
-	dprintk("format name = %s\n",
-			vino_data_formats[index].description);
+	dprintk("format name = %s\n", vino_data_formats[fd->index].description);
 
-	memset(fd, 0, sizeof(struct v4l2_fmtdesc));
-	fd->index = index;
-	fd->type = type;
-	fd->pixelformat = vino_data_formats[index].pixelformat;
-	strcpy(fd->description, vino_data_formats[index].description);
+	fd->pixelformat = vino_data_formats[fd->index].pixelformat;
+	strcpy(fd->description, vino_data_formats[fd->index].description);
 	return 0;
 }
 
@@ -3327,11 +3319,7 @@ static int vino_g_parm(struct file *file, void *__fh,
 {
 	struct vino_channel_settings *vcs = video_drvdata(file);
 	unsigned long flags;
-
-	switch (sp->type) {
-	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 	struct v4l2_captureparm *cp = &sp->parm.capture;
-		memset(cp, 0, sizeof(struct v4l2_captureparm));
 
 	cp->capability = V4L2_CAP_TIMEPERFRAME;
 	cp->timeperframe.numerator = 1;
@@ -3342,13 +3330,7 @@ static int vino_g_parm(struct file *file, void *__fh,
 
 	spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
 
-		// TODO: cp->readbuffers = xxx;
-		break;
-	}
-	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
-	default:
-		return -EINVAL;
-	}
+	/* TODO: cp->readbuffers = xxx; */
 
 	return 0;
 }
@@ -3358,9 +3340,6 @@ static int vino_s_parm(struct file *file, void *__fh,
 {
 	struct vino_channel_settings *vcs = video_drvdata(file);
 	unsigned long flags;
-
-	switch (sp->type) {
-	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 	struct v4l2_captureparm *cp = &sp->parm.capture;
 
 	spin_lock_irqsave(&vino_drvdata->input_lock, flags);
@@ -3376,14 +3355,6 @@ static int vino_s_parm(struct file *file, void *__fh,
 
 	spin_unlock_irqrestore(&vino_drvdata->input_lock, flags);
 
-		// TODO: set buffers according to cp->readbuffers
-		break;
-	}
-	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
-	default:
-		return -EINVAL;
-	}
-
 	return 0;
 }
 
@@ -3391,12 +3362,11 @@ static int vino_reqbufs(struct file *file, void *__fh,
 			     struct v4l2_requestbuffers *rb)
 {
 	struct vino_channel_settings *vcs = video_drvdata(file);
+
 	if (vcs->reading)
 		return -EBUSY;
 
-	switch (rb->type) {
-	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
-		// TODO: check queue type
+	/* TODO: check queue type */
 	if (rb->memory != V4L2_MEMORY_MMAP) {
 		dprintk("type not mmap\n");
 		return -EINVAL;
@@ -3422,12 +3392,6 @@ static int vino_reqbufs(struct file *file, void *__fh,
 		vino_capture_stop(vcs);
 		vino_queue_free(&vcs->fb_queue);
 	}
-		break;
-	}
-	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
-	default:
-		return -EINVAL;
-	}
 
 	return 0;
 }
@@ -3474,14 +3438,12 @@ static int vino_querybuf(struct file *file, void *__fh,
 			      struct v4l2_buffer *b)
 {
 	struct vino_channel_settings *vcs = video_drvdata(file);
+	struct vino_framebuffer *fb;
+
 	if (vcs->reading)
 		return -EBUSY;
 
-	switch (b->type) {
-	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
-		struct vino_framebuffer *fb;
-
-		// TODO: check queue type
+	/* TODO: check queue type */
 	if (b->index >= vino_queue_get_length(&vcs->fb_queue)) {
 		dprintk("invalid index = %d\n",
 		       b->index);
@@ -3496,12 +3458,6 @@ static int vino_querybuf(struct file *file, void *__fh,
 	}
 
 	vino_v4l2_get_buffer_status(vcs, fb, b);
-		break;
-	}
-	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
-	default:
-		return -EINVAL;
-	}
 
 	return 0;
 }
@@ -3510,15 +3466,13 @@ static int vino_qbuf(struct file *file, void *__fh,
 			  struct v4l2_buffer *b)
 {
 	struct vino_channel_settings *vcs = video_drvdata(file);
-	if (vcs->reading)
-		return -EBUSY;
-
-	switch (b->type) {
-	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 	struct vino_framebuffer *fb;
 	int ret;
 
-		// TODO: check queue type
+	if (vcs->reading)
+		return -EBUSY;
+
+	/* TODO: check queue type */
 	if (b->memory != V4L2_MEMORY_MMAP) {
 		dprintk("type not mmap\n");
 		return -EINVAL;
@@ -3535,12 +3489,6 @@ static int vino_qbuf(struct file *file, void *__fh,
 		if (ret)
 			return ret;
 	}
-		break;
-	}
-	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
-	default:
-		return -EINVAL;
-	}
 
 	return 0;
 }
@@ -3550,16 +3498,14 @@ static int vino_dqbuf(struct file *file, void *__fh,
 {
 	struct vino_channel_settings *vcs = video_drvdata(file);
 	unsigned int nonblocking = file->f_flags & O_NONBLOCK;
-	if (vcs->reading)
-		return -EBUSY;
-
-	switch (b->type) {
-	case V4L2_BUF_TYPE_VIDEO_CAPTURE: {
 	struct vino_framebuffer *fb;
 	unsigned int incoming, outgoing;
 	int err;
 
-		// TODO: check queue type
+	if (vcs->reading)
+		return -EBUSY;
+
+	/* TODO: check queue type */
 
 	err = vino_queue_get_incoming(&vcs->fb_queue, &incoming);
 	if (err) {
@@ -3589,10 +3535,9 @@ static int vino_dqbuf(struct file *file, void *__fh,
 		if (err) {
 			err = vino_wait_for_frame(vcs);
 			if (err) {
-					/* interrupted or
-					 * no frames captured because
-					 * of frame skipping */
-					// vino_capture_failed(vcs);
+				/* interrupted or no frames captured because of
+				 * frame skipping */
+				/* vino_capture_failed(vcs); */
 				return -EIO;
 			}
 		}
@@ -3611,13 +3556,6 @@ static int vino_dqbuf(struct file *file, void *__fh,
 	if (err)
 		return -EIO;
 
-		break;
-	}
-	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
-	default:
-		return -EINVAL;
-	}
-
 	return 0;
 }