[PATCH 08/15] mediactl: Add support for media device pipelines

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Add infrastructure for linking media entities and discovering
media device pipelines.

Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
 utils/media-ctl/libmediactl.c   |  117 +++++++++++++++++++++++++++++++++++++++
 utils/media-ctl/mediactl-priv.h |    6 ++
 utils/media-ctl/mediactl.h      |   71 ++++++++++++++++++++++++
 3 files changed, 194 insertions(+)

diff --git a/utils/media-ctl/libmediactl.c b/utils/media-ctl/libmediactl.c
index 3a45ecc..9909c1c 100644
--- a/utils/media-ctl/libmediactl.c
+++ b/utils/media-ctl/libmediactl.c
@@ -1109,3 +1109,120 @@ int media_parse_setup_links(struct media_device *media, const char *p)
 
 	return *end ? -EINVAL : 0;
 }
+
+/* -----------------------------------------------------------------------------
+ * Pipeline operations
+ */
+
+int media_discover_pipeline_by_entity(struct media_device *media,
+				      struct media_entity *entity)
+{
+	struct media_entity *pipe_head = NULL;
+	struct media_pad *src_pad;
+	struct media_link *link = NULL, *backlinks[10];
+	int i, num_backlinks, ret;
+
+	if (entity == NULL)
+		return -EINVAL;
+
+	for (;;) {
+		/* Make recently discovered entity the pipeline head */
+		if (pipe_head == NULL) {
+			pipe_head = entity;
+		} else {
+			entity->next = pipe_head;
+			pipe_head = entity;
+		}
+
+		/* Cache a source pad used for linking the entity */
+		if (link)
+			entity->pipe_src_pad = link->source;
+
+		ret = media_get_backlinks_by_entity(entity,
+						    backlinks,
+						    &num_backlinks);
+		if (ret < 0)
+			return ret;
+
+		/* check if pipeline source entity has been reached */
+		if (num_backlinks > 2) {
+			media_dbg(media, "Unexpected number of busy sink pads (%d)\n", num_backlinks);
+			return -EINVAL;
+		} else if (num_backlinks == 2) {
+			/*
+			 * Allow two active pads only in case of
+			 * S5C73M3-OIF entity.
+			 */
+			if (strcmp(entity->info.name, "S5C73M3-OIF")) {
+				media_dbg(media, "Ambiguous media device topology: two busy sink pads");
+				return -EINVAL;
+			}
+			/*
+			 * Two active links are allowed betwen S5C73M3-OIF and
+			 * S5C73M3 entities. In such a case a route through pad
+			 * with id == 0 has to be selected.
+			 */
+			for (i = 0; i < num_backlinks; i++)
+				if (backlinks[i]->sink->index == 0)
+					link = backlinks[i];
+		} else if (num_backlinks == 1)
+			link = backlinks[0];
+		else
+			break;
+
+		/* Cache a sink pad used for linking the entity */
+		entity->pipe_sink_pad = link->sink;
+
+		media_dbg(media, "Discovered sink pad %d for the %s entity\n",
+			  entity->pipe_sink_pad->index, media_entity_get_name(entity));
+
+		src_pad = media_entity_remote_source(link->sink);
+		if (!src_pad)
+			return -EINVAL;
+
+		entity = src_pad->entity;
+	}
+
+	media->pipeline = pipe_head;
+
+	return 0;
+}
+
+int media_has_pipeline_entity(struct media_entity *pipeline, char *entity_name)
+{
+	if (pipeline == NULL || entity_name == NULL)
+		return -EINVAL;
+
+	while (pipeline) {
+		if (!strncmp(pipeline->info.name, entity_name,
+			     strlen(entity_name)))
+			return 1;
+		pipeline = pipeline->next;
+	}
+
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * Media entity access
+ */
+
+struct media_entity *media_get_pipeline(struct media_device *media)
+{
+	return media->pipeline;
+}
+
+int media_entity_get_src_pad_index(struct media_entity *entity)
+{
+	return entity->pipe_src_pad->index;
+}
+
+int media_entity_get_sink_pad_index(struct media_entity *entity)
+{
+	return entity->pipe_sink_pad->index;
+}
+
+struct media_entity *media_entity_get_next(struct media_entity *entity)
+{
+	return entity->next;
+}
diff --git a/utils/media-ctl/mediactl-priv.h b/utils/media-ctl/mediactl-priv.h
index f531c52..3378880 100644
--- a/utils/media-ctl/mediactl-priv.h
+++ b/utils/media-ctl/mediactl-priv.h
@@ -36,9 +36,14 @@ struct media_entity {
 	unsigned int max_links;
 	unsigned int num_links;
 
+	struct media_pad *pipe_src_pad;
+	struct media_pad *pipe_sink_pad;
+
 	struct v4l2_subdev *sd;
 
 	char devname[32];
+
+	struct media_entity *next;
 };
 
 struct media_device {
@@ -49,6 +54,7 @@ struct media_device {
 	struct media_device_info info;
 	struct media_entity *entities;
 	unsigned int entities_count;
+	struct media_entity *pipeline;
 
 	void (*debug_handler)(void *, ...);
 	void *debug_priv;
diff --git a/utils/media-ctl/mediactl.h b/utils/media-ctl/mediactl.h
index 1d62191..4570160 100644
--- a/utils/media-ctl/mediactl.h
+++ b/utils/media-ctl/mediactl.h
@@ -500,4 +500,75 @@ int media_get_backlinks_by_entity(struct media_entity *entity,
 				struct media_link **backlinks,
 				int *num_backlinks);
 
+/**
+ * @brief Check presence of the entity in the pipeline
+ * @param pipeline - video pipeline within a media device.
+ * @param entity_name - name of the entity to search for.
+ *
+ * Check if the entity with entity_name belongs to
+ * the pipeline.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int media_has_pipeline_entity(struct media_entity *pipeline, char *entity_name);
+
+/**
+ * @brief Discover the video pipeline
+ * @param media - media device.
+ * @param entity - media entity.
+ *
+ * Discover the pipeline of sub-devices, by walking
+ * upstream starting from the passed sink entity until
+ * the camera sensor entity is encountered.
+ *
+ * @return 0 on success, or a negative error code on failure.
+ */
+int media_discover_pipeline_by_entity(struct media_device *media,
+				struct media_entity *entity);
+
+/**
+ * @brief Get source pad of the pipeline entity
+ * @param entity - media entity.
+ *
+ * This function returns the source pad of the entity.
+ *
+ * @return entity source pad, or NULL if the entity is not linked.
+ */
+int media_entity_get_src_pad_index(struct media_entity *entity);
+
+/**
+ * @brief Get sink pad of the pipeline entity
+ * @param entity - media entity.
+ *
+ * This function returns the sink pad of the entity.
+ *
+ * @return entity sink pad, or NULL if the entity is not linked.
+ */
+int media_entity_get_sink_pad_index(struct media_entity *entity);
+
+/**
+ * @brief Get next entity in the pipeline
+ * @param entity - media entity
+ *
+ * This function gets the entity connected to a source pad of this entity.
+ *
+ * @return next enetity in the pipeline,
+ *	   or NULL if the entity is not linked
+ */
+struct media_entity *media_entity_get_next(struct media_entity *entity);
+
+/**
+ * @brief Get the video pipeline
+ * @param media - media device
+ *
+ * This function gets the pipeline of media entities. The pipeline
+ * source entity is a camera sensor and the sink one is the entity
+ * representing opened video device node. The pipeline has to be
+ * discovered with use of the function media_discover_pipeline_by_entity.
+ *
+ * @return first media_entity in the pipeline,
+ *	   or NULL if the pipeline hasn't been discovered
+ */
+struct media_entity *media_get_pipeline(struct media_device *media);
+
 #endif
-- 
1.7.9.5

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