[media] s5p-fimc: Add media operations in the capture entity driver

Add the link_setup handler for the camera capture video node.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/s5p-fimc/fimc-capture.c

@@ -669,6 +669,37 @@ static const struct v4l2_ioctl_ops fimc_capture_ioctl_ops = {
 	.vidioc_g_input			= fimc_cap_g_input,
 };
 
+/* Media operations */
+static int fimc_link_setup(struct media_entity *entity,
+			   const struct media_pad *local,
+			   const struct media_pad *remote, u32 flags)
+{
+	struct video_device *vd = media_entity_to_video_device(entity);
+	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(remote->entity);
+	struct fimc_dev *fimc = video_get_drvdata(vd);
+
+	if (WARN_ON(fimc == NULL))
+		return 0;
+
+	dbg("%s --> %s, flags: 0x%x. input: 0x%x",
+	    local->entity->name, remote->entity->name, flags,
+	    fimc->vid_cap.input);
+
+	if (flags & MEDIA_LNK_FL_ENABLED) {
+		if (fimc->vid_cap.input != 0)
+			return -EBUSY;
+		fimc->vid_cap.input = sd->grp_id;
+		return 0;
+	}
+
+	fimc->vid_cap.input = 0;
+	return 0;
+}
+
+static const struct media_entity_operations fimc_media_ops = {
+	.link_setup = fimc_link_setup,
+};
+
 /* fimc->lock must be already initialized */
 int fimc_register_capture_device(struct fimc_dev *fimc,
 				 struct v4l2_device *v4l2_dev)
@@ -743,6 +774,7 @@ int fimc_register_capture_device(struct fimc_dev *fimc,
 	if (ret)
 		goto err_ent;
 
+	vfd->entity.ops = &fimc_media_ops;
 	vfd->ctrl_handler = &ctx->ctrl_handler;
 	return 0;
 

drivers/media/video/s5p-fimc/fimc-core.h

@@ -305,6 +305,7 @@ struct fimc_m2m_device {
  * @reqbufs_count: the number of buffers requested in REQBUFS ioctl
  * @input_index: input (camera sensor) index
  * @refcnt: driver's private reference counter
+ * @input: capture input type, grp_id of the attached subdev
  * @user_subdev_api: true if subdevs are not configured by the host driver
  */
 struct fimc_vid_cap {
@@ -323,6 +324,7 @@ struct fimc_vid_cap {
 	unsigned int			reqbufs_count;
 	int				input_index;
 	int				refcnt;
+	u32				input;
 	bool				user_subdev_api;
 };