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[media] v4l2-ioctl.c: improve cropcap compatibility code

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- Add a check for the case that both the cropcap and g_selection ops
  are NULL. This shouldn't happen, but I feel happier if the code
  guards against this.

- If g_selection exists, then ignore ENOTTY and ENOIOCTLCMD error
  codes from cropcap. Just assume square pixelaspect ratio in that
  case. This situation can happen if the bridge driver's cropcap op
  calls the corresponding subdev's op. So the cropcap ioctl is set,
  but it might return ENOIOCTLCMD anyway. In the past this would
  just return an error which is wrong.

- Call cropcap first and let g_selection overwrite the bounds and
  defrect. This safeguards against subdev cropcap implementations
  that set those rectangles as well. What g_selection returns has
  priority over what such cropcap implementations return.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2016-04-15 06:27:28 -03:00 committed by Mauro Carvalho Chehab
parent 92021e074a
commit 95dd7b7e30
1 changed files with 44 additions and 28 deletions
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38
drivers/media/v4l2-core/v4l2-ioctl.c
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@ -2160,10 +2160,34 @@ static int v4l_cropcap(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
struct v4l2_cropcap *p = arg;
if (ops->vidioc_g_selection) {
struct v4l2_selection s = { .type = p->type };
int ret;
int ret = 0;
/* setting trivial pixelaspect */
p->pixelaspect.numerator = 1;
p->pixelaspect.denominator = 1;
/*
* The determine_valid_ioctls() call already should ensure
* that this can never happen, but just in case...
*/
if (WARN_ON(!ops->vidioc_cropcap && !ops->vidioc_cropcap))
return -ENOTTY;
if (ops->vidioc_cropcap)
ret = ops->vidioc_cropcap(file, fh, p);
if (!ops->vidioc_g_selection)
return ret;
/*
* Ignore ENOTTY or ENOIOCTLCMD error returns, just use the
* square pixel aspect ratio in that case.
*/
if (ret && ret != -ENOTTY && ret != -ENOIOCTLCMD)
return ret;
/* Use g_selection() to fill in the bounds and defrect rectangles */
/* obtaining bounds */
if (V4L2_TYPE_IS_OUTPUT(p->type))
@ -2186,14 +2210,6 @@ static int v4l_cropcap(const struct v4l2_ioctl_ops *ops,
if (ret)
return ret;
p->defrect = s.r;
}
/* setting trivial pixelaspect */
p->pixelaspect.numerator = 1;
p->pixelaspect.denominator = 1;
if (ops->vidioc_cropcap)
return ops->vidioc_cropcap(file, fh, p);
return 0;
}