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

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>

diff --git a/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst b/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
index 6eb4007..8db1037 100644 (file)
--- a/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-dqevent.rst
@@ -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}|

diff --git a/Documentation/userspace-api/media/videodev2.h.rst.exceptions b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
index 64b2c0b..2a589d3 100644 (file)
--- a/Documentation/userspace-api/media/videodev2.h.rst.exceptions
+++ b/Documentation/userspace-api/media/videodev2.h.rst.exceptions
@@ -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
 

diff --git a/drivers/media/v4l2-core/v4l2-ctrls-api.c b/drivers/media/v4l2-core/v4l2-ctrls-api.c
index 878da85..67fbdcc 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-ctrls-api.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-api.c
@@ -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);

diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 01e630f..c415ce5 100644 (file)
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -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;