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V4L/DVB (8116): videodev: allow PRIVATE_BASE controls when called through VIDIOC_G/S_CTRL.

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V4L2_CID_PRIVATE_BASE controls are not allowed when called from
VIDIOC_S/G_EXT_CTRL as extended controls use a better mechanism
for private controls. But still allow it when called from the
VIDIOC_G/S_CTRL to extended control conversion in video_ioctl2()
for backwards compatibility.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Hans Verkuil 2008-06-25 06:54:05 -03:00 committed by Mauro Carvalho Chehab
parent c5588b5c47
commit 6264c80661
1 changed files with 11 additions and 8 deletions
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19
drivers/media/video/videodev.c
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@ -710,7 +710,7 @@ static inline void v4l_print_ext_ctrls(unsigned int cmd,
printk(KERN_CONT "\n");
};
static inline int check_ext_ctrls(struct v4l2_ext_controls *c)
static inline int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
{
__u32 i;
@ -721,8 +721,11 @@ static inline int check_ext_ctrls(struct v4l2_ext_controls *c)
c->controls[i].reserved2[1] = 0;
}
/* V4L2_CID_PRIVATE_BASE cannot be used as control class
* when using extended controls. */
if (c->ctrl_class == V4L2_CID_PRIVATE_BASE)
when using extended controls.
Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
is it allowed for backwards compatibility.
*/
if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
return 0;
/* Check that all controls are from the same control class. */
for (i = 0; i < c->count; i++) {
@ -1426,7 +1429,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
ctrls.controls = &ctrl;
ctrl.id = p->id;
ctrl.value = p->value;
if (check_ext_ctrls(&ctrls)) {
if (check_ext_ctrls(&ctrls, 1)) {
ret = vfd->vidioc_g_ext_ctrls(file, fh, &ctrls);
if (ret == 0)
p->value = ctrl.value;
@ -1462,7 +1465,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
ctrls.controls = &ctrl;
ctrl.id = p->id;
ctrl.value = p->value;
if (check_ext_ctrls(&ctrls))
if (check_ext_ctrls(&ctrls, 1))
ret = vfd->vidioc_s_ext_ctrls(file, fh, &ctrls);
break;
}
@ -1473,7 +1476,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
p->error_idx = p->count;
if (!vfd->vidioc_g_ext_ctrls)
break;
if (check_ext_ctrls(p))
if (check_ext_ctrls(p, 0))
ret = vfd->vidioc_g_ext_ctrls(file, fh, p);
v4l_print_ext_ctrls(cmd, vfd, p, !ret);
break;
@ -1486,7 +1489,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
if (!vfd->vidioc_s_ext_ctrls)
break;
v4l_print_ext_ctrls(cmd, vfd, p, 1);
if (check_ext_ctrls(p))
if (check_ext_ctrls(p, 0))
ret = vfd->vidioc_s_ext_ctrls(file, fh, p);
break;
}
@ -1498,7 +1501,7 @@ static int __video_do_ioctl(struct inode *inode, struct file *file,
if (!vfd->vidioc_try_ext_ctrls)
break;
v4l_print_ext_ctrls(cmd, vfd, p, 1);
if (check_ext_ctrls(p))
if (check_ext_ctrls(p, 0))
ret = vfd->vidioc_try_ext_ctrls(file, fh, p);
break;
}