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media: entity: Add support for ancillary links

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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>
Reviewed-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Daniel Scally 2022-03-02 22:03:03 +00:00 committed by Mauro Carvalho Chehab
parent 9d0c23bfe7
commit 012c87f769
2 changed files with 41 additions and 0 deletions
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22
drivers/media/mc/mc-entity.c
View File

@ -1029,3 +1029,25 @@ void media_remove_intf_links(struct media_interface *intf)
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);

19
include/media/media-entity.h
View File

@ -1121,4 +1121,23 @@ void media_remove_intf_links(struct media_interface *intf);
(((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