[PATCH 02/32] media: entity: Add media_entity_has_route() function

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From: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

This is a wrapper around the media entity has_route operation.

Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Signed-off-by: Michal Simek <michal.simek@xxxxxxxxxx>
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
---
 drivers/media/media-entity.c | 29 +++++++++++++++++++++++++++++
 include/media/media-entity.h |  3 +++
 2 files changed, 32 insertions(+)

diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
index c68239e..4d03ea7 100644
--- a/drivers/media/media-entity.c
+++ b/drivers/media/media-entity.c
@@ -242,6 +242,35 @@ EXPORT_SYMBOL_GPL(media_entity_pads_init);
  * Graph traversal
  */
 
+/**
+ * media_entity_has_route - Check if two entity pads are connected internally
+ * @entity: The entity
+ * @pad0: The first pad index
+ * @pad1: The second pad index
+ *
+ * This function can be used to check whether two pads of an entity are
+ * connected internally in the entity.
+ *
+ * The caller must hold entity->source->parent->mutex.
+ *
+ * Return: true if the pads are connected internally and false otherwise.
+ */
+bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
+			    unsigned int pad1)
+{
+	if (pad0 >= entity->num_pads || pad1 >= entity->num_pads)
+		return false;
+
+	if (pad0 == pad1)
+		return true;
+
+	if (!entity->ops || !entity->ops->has_route)
+		return true;
+
+	return entity->ops->has_route(entity, pad0, pad1);
+}
+EXPORT_SYMBOL_GPL(media_entity_has_route);
+
 static struct media_entity *
 media_entity_other(struct media_entity *entity, struct media_link *link)
 {
diff --git a/include/media/media-entity.h b/include/media/media-entity.h
index 8f9fc85..5fb3f06 100644
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -851,6 +851,9 @@ void media_entity_graph_walk_cleanup(struct media_entity_graph *graph);
  */
 void media_entity_put(struct media_entity *entity);
 
+bool media_entity_has_route(struct media_entity *entity, unsigned int sink,
+			    unsigned int source);
+
 /**
  * media_entity_graph_walk_start - Start walking the media graph at a
  *	given entity
-- 
2.10.2




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