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