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[media] usb/uvc: Support for V4L2_CTRL_WHICH_DEF_VAL 

This driver does not use the control infrastructure.
Add support for the new field which on structure
 v4l2_ext_controls

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Ricardo Ribalda 2015-10-29 08:10:30 -02:00 committed by Mauro Carvalho Chehab
parent 953eae5d8d
commit 91739838a5
1 changed files with 20 additions and 0 deletions
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20
drivers/media/usb/uvc/uvc_v4l2.c
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@ -983,6 +983,22 @@ static int uvc_ioctl_g_ext_ctrls(struct file *file, void *fh,
unsigned int i;
int ret;
if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL) {
for (i = 0; i < ctrls->count; ++ctrl, ++i) {
struct v4l2_queryctrl qc = { .id = ctrl->id };
ret = uvc_query_v4l2_ctrl(chain, &qc);
if (ret < 0) {
ctrls->error_idx = i;
return ret;
}
ctrl->value = qc.default_value;
}
return 0;
}
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;
@ -1010,6 +1026,10 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
unsigned int i;
int ret;
/* Default value cannot be changed */
if (ctrls->which == V4L2_CTRL_WHICH_DEF_VAL)
return -EINVAL;
ret = uvc_ctrl_begin(chain);
if (ret < 0)
return ret;