[12/15] mediactl: libv4l2subdev: add get_pipeline_entity_by_cid function

Commit Message

Jacek Anaszewski Jan. 18, 2016, 4:17 p.m. UTC

Add a function for obtaining the v4l2 sub-device for which
the v4l2 control related ioctl is predestined.

Signed-off-by: Jacek Anaszewski <[e-mail]>
Acked-by: Kyungmin Park <[e-mail]>
---
 utils/media-ctl/libv4l2subdev.c |   14 ++++++++++++++
 utils/media-ctl/v4l2subdev.h    |   15 +++++++++++++++
 2 files changed, 29 insertions(+)

Patch

diff --git a/utils/media-ctl/libv4l2subdev.c b/utils/media-ctl/libv4l2subdev.c
index 9d48ac1..14e9423 100644
--- a/utils/media-ctl/libv4l2subdev.c
+++ b/utils/media-ctl/libv4l2subdev.c
@@ -1052,3 +1052,17 @@  bool v4l2_subdev_has_v4l2_control_redir(struct media_device *media,
 
 	return false;
 }
+
+struct media_entity *v4l2_subdev_get_pipeline_entity_by_cid(struct media_device *media,
+						int cid)
+{
+	struct media_entity *entity = media->pipeline;
+
+	while (entity) {
+		if (v4l2_subdev_has_v4l2_control_redir(media, entity, cid))
+			return entity;
+		entity = entity->next;
+	}
+
+	return NULL;
+}
diff --git a/utils/media-ctl/v4l2subdev.h b/utils/media-ctl/v4l2subdev.h
index be2d82e..607ec50 100644
--- a/utils/media-ctl/v4l2subdev.h
+++ b/utils/media-ctl/v4l2subdev.h
@@ -394,4 +394,19 @@  enum v4l2_subdev_fmt_mismatch v4l2_subdev_format_compare(
 bool v4l2_subdev_has_v4l2_control_redir(struct media_device *media,
 	struct media_entity *entity, int ctrl_id);
 
+/**
+ * @brief Get the first pipeline entity supporting the control
+ * @param media - media device.
+ * @param cid - v4l2 control identifier.
+ *
+ * Get the first entity in the media device pipeline,
+ * for which v4l2_control with cid is to be redirected
+ *
+ * @return associated entity if defined, or NULL if the
+ *	   control redirection wasn't defined for any entity
+ *	   in the pipeline
+ */
+struct media_entity *v4l2_subdev_get_pipeline_entity_by_cid(
+	struct media_device *media, int cid);
+
 #endif