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media: v4l2-ctrls: add change flag for when dimensions change

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Add a new V4L2_EVENT_CTRL_CH_DIMENSIONS change flag that is issued
when the dimensions of an array change as a result of a
__v4l2_ctrl_modify_dimensions() call.

This will inform userspace that there are new dimensions.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Hans Verkuil 2022-07-11 12:21:10 +02:00 committed by Mauro Carvalho Chehab
parent 0975274557
commit 43cc0ec381
4 changed files with 9 additions and 1 deletions
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5
Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
View File

@ -332,6 +332,11 @@ call.
- 0x0004
- This control event was triggered because the minimum, maximum,
step or the default value of the control changed.
* - ``V4L2_EVENT_CTRL_CH_DIMENSIONS``
- 0x0008
- This control event was triggered because the dimensions of the
control changed. Note that the number of dimensions remains the
same.
.. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.5cm}|

1
Documentation/userspace-api/media/videodev2.h.rst.exceptions
View File

@ -514,6 +514,7 @@ replace define V4L2_EVENT_PRIVATE_START event-type
replace define V4L2_EVENT_CTRL_CH_VALUE ctrl-changes-flags
replace define V4L2_EVENT_CTRL_CH_FLAGS ctrl-changes-flags
replace define V4L2_EVENT_CTRL_CH_RANGE ctrl-changes-flags
replace define V4L2_EVENT_CTRL_CH_DIMENSIONS ctrl-changes-flags
replace define V4L2_EVENT_SRC_CH_RESOLUTION src-changes-flags

3
drivers/media/v4l2-core/v4l2-ctrls-api.c
View File

@ -1020,7 +1020,8 @@ int __v4l2_ctrl_modify_dimensions(struct v4l2_ctrl *ctrl,
for (i = 0; i < elems; i++)
ctrl->type_ops->init(ctrl, i, ctrl->p_cur);
cur_to_new(ctrl);
send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_VALUE);
send_event(NULL, ctrl, V4L2_EVENT_CTRL_CH_VALUE |
V4L2_EVENT_CTRL_CH_DIMENSIONS);
return 0;
}
EXPORT_SYMBOL(__v4l2_ctrl_modify_dimensions);

1
include/uapi/linux/videodev2.h
View File

@ -2435,6 +2435,7 @@ struct v4l2_event_vsync {
#define V4L2_EVENT_CTRL_CH_VALUE (1 << 0)
#define V4L2_EVENT_CTRL_CH_FLAGS (1 << 1)
#define V4L2_EVENT_CTRL_CH_RANGE (1 << 2)
#define V4L2_EVENT_CTRL_CH_DIMENSIONS (1 << 3)
struct v4l2_event_ctrl {
__u32 changes;