[media] v4l2: add a motion detection event

Add a new MOTION_DET event to signal when motion is detected.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

include/uapi/linux/videodev2.h

@@ -1799,6 +1799,7 @@ struct v4l2_streamparm {
 #define V4L2_EVENT_CTRL				3
 #define V4L2_EVENT_FRAME_SYNC			4
 #define V4L2_EVENT_SOURCE_CHANGE		5
+#define V4L2_EVENT_MOTION_DET			6
 #define V4L2_EVENT_PRIVATE_START		0x08000000
 
 /* Payload for V4L2_EVENT_VSYNC */
@@ -1836,6 +1837,21 @@ struct v4l2_event_src_change {
 	__u32 changes;
 };
 
+#define V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ	(1 << 0)
+
+/**
+ * struct v4l2_event_motion_det - motion detection event
+ * @flags:             if V4L2_EVENT_MD_FL_HAVE_FRAME_SEQ is set, then the
+ *                     frame_sequence field is valid.
+ * @frame_sequence:    the frame sequence number associated with this event.
+ * @region_mask:       which regions detected motion.
+ */
+struct v4l2_event_motion_det {
+	__u32 flags;
+	__u32 frame_sequence;
+	__u32 region_mask;
+};
+
 struct v4l2_event {
 	__u32				type;
 	union {
@@ -1843,6 +1859,7 @@ struct v4l2_event {
 		struct v4l2_event_ctrl		ctrl;
 		struct v4l2_event_frame_sync	frame_sync;
 		struct v4l2_event_src_change	src_change;
+		struct v4l2_event_motion_det	motion_det;
 		__u8				data[64];
 	} u;
 	__u32				pending;