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From f07c6a12bf8b432e70d312ab60b0a07197fa8162 Mon Sep 17 00:00:00 2001
From: Daniel Scally <djrscally@gmail.com>
Date: Wed, 2 Mar 2022 22:03:03 +0000
Subject: [PATCH] media: entity: Add support for ancillary links
Add functions to create ancillary links, so that they don't need to
be manually created by users.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Scally <djrscally@gmail.com>
---
drivers/media/mc/mc-entity.c | 22 ++++++++++++++++++++++
include/media/media-entity.h | 19 +++++++++++++++++++
2 files changed, 41 insertions(+)
--- a/drivers/media/mc/mc-entity.c
+++ b/drivers/media/mc/mc-entity.c
@@ -1050,3 +1050,25 @@ void media_remove_intf_links(struct medi
mutex_unlock(&mdev->graph_mutex);
}
EXPORT_SYMBOL_GPL(media_remove_intf_links);
+
+struct media_link *media_create_ancillary_link(struct media_entity *primary,
+ struct media_entity *ancillary)
+{
+ struct media_link *link;
+
+ link = media_add_link(&primary->links);
+ if (!link)
+ return ERR_PTR(-ENOMEM);
+
+ link->gobj0 = &primary->graph_obj;
+ link->gobj1 = &ancillary->graph_obj;
+ link->flags = MEDIA_LNK_FL_IMMUTABLE | MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_ANCILLARY_LINK;
+
+ /* Initialize graph object embedded in the new link */
+ media_gobj_create(primary->graph_obj.mdev, MEDIA_GRAPH_LINK,
+ &link->graph_obj);
+
+ return link;
+}
+EXPORT_SYMBOL_GPL(media_create_ancillary_link);
--- a/include/media/media-entity.h
+++ b/include/media/media-entity.h
@@ -1107,4 +1107,23 @@ void media_remove_intf_links(struct medi
(((entity)->ops && (entity)->ops->operation) ? \
(entity)->ops->operation((entity) , ##args) : -ENOIOCTLCMD)
+/**
+ * media_create_ancillary_link() - create an ancillary link between two
+ * instances of &media_entity
+ *
+ * @primary: pointer to the primary &media_entity
+ * @ancillary: pointer to the ancillary &media_entity
+ *
+ * Create an ancillary link between two entities, indicating that they
+ * represent two connected pieces of hardware that form a single logical unit.
+ * A typical example is a camera lens controller being linked to the sensor that
+ * it is supporting.
+ *
+ * The function sets both MEDIA_LNK_FL_ENABLED and MEDIA_LNK_FL_IMMUTABLE for
+ * the new link.
+ */
+struct media_link *
+media_create_ancillary_link(struct media_entity *primary,
+ struct media_entity *ancillary);
+
#endif
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