diff options
| -rw-r--r-- | Documentation/driver-api/media/mc-core.rst | 3 | ||||
| -rw-r--r-- | drivers/media/mc/mc-entity.c | 39 | ||||
| -rw-r--r-- | include/media/media-entity.h | 46 |
3 files changed, 87 insertions, 1 deletions
diff --git a/Documentation/driver-api/media/mc-core.rst b/Documentation/driver-api/media/mc-core.rst index 6eea6a3b6441..66801506b2dd 100644 --- a/Documentation/driver-api/media/mc-core.rst +++ b/Documentation/driver-api/media/mc-core.rst @@ -186,7 +186,8 @@ is required and the graph structure can be freed normally. Helper functions can be used to find a link between two given pads, or a pad connected to another pad through an enabled link -:c:func:`media_entity_find_link()` and :c:func:`media_pad_remote_pad_first()`. +(:c:func:`media_entity_find_link()`, :c:func:`media_pad_remote_pad_first()` and +:c:func:`media_entity_remote_source_pad_unique()`). Use count and power handling ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c index 66ba0629c4ce..767846b216c5 100644 --- a/drivers/media/mc/mc-entity.c +++ b/drivers/media/mc/mc-entity.c @@ -921,6 +921,45 @@ struct media_pad *media_pad_remote_pad_first(const struct media_pad *pad) } EXPORT_SYMBOL_GPL(media_pad_remote_pad_first); +struct media_pad * +media_entity_remote_pad_unique(const struct media_entity *entity, + unsigned int type) +{ + struct media_pad *pad = NULL; + struct media_link *link; + + list_for_each_entry(link, &entity->links, list) { + struct media_pad *local_pad; + struct media_pad *remote_pad; + + if (((link->flags & MEDIA_LNK_FL_LINK_TYPE) != + MEDIA_LNK_FL_DATA_LINK) || + !(link->flags & MEDIA_LNK_FL_ENABLED)) + continue; + + if (type == MEDIA_PAD_FL_SOURCE) { + local_pad = link->sink; + remote_pad = link->source; + } else { + local_pad = link->source; + remote_pad = link->sink; + } + + if (local_pad->entity == entity) { + if (pad) + return ERR_PTR(-ENOTUNIQ); + + pad = remote_pad; + } + } + + if (!pad) + return ERR_PTR(-ENOLINK); + + return pad; +} +EXPORT_SYMBOL_GPL(media_entity_remote_pad_unique); + static void media_interface_init(struct media_device *mdev, struct media_interface *intf, u32 gobj_type, diff --git a/include/media/media-entity.h b/include/media/media-entity.h index 5e272a0a9895..c5618f7c1408 100644 --- a/include/media/media-entity.h +++ b/include/media/media-entity.h @@ -860,6 +860,52 @@ struct media_link *media_entity_find_link(struct media_pad *source, struct media_pad *media_pad_remote_pad_first(const struct media_pad *pad); /** + * media_entity_remote_pad_unique - Find a remote pad connected to an entity + * @entity: The entity + * @type: The type of pad to find (MEDIA_PAD_FL_SINK or MEDIA_PAD_FL_SOURCE) + * + * Search for and return a remote pad of @type connected to @entity through an + * enabled link. If multiple (or no) remote pads match these criteria, an error + * is returned. + * + * The uniqueness constraint makes this helper function suitable for entities + * that support a single active source or sink at a time. + * + * Return: A pointer to the remote pad, or one of the following error pointers + * if an error occurs: + * + * * -ENOTUNIQ - Multiple links are enabled + * * -ENOLINK - No connected pad found + */ +struct media_pad * +media_entity_remote_pad_unique(const struct media_entity *entity, + unsigned int type); + +/** + * media_entity_remote_source_pad_unique - Find a remote source pad connected to + * an entity + * @entity: The entity + * + * Search for and return a remote source pad connected to @entity through an + * enabled link. If multiple (or no) remote pads match these criteria, an error + * is returned. + * + * The uniqueness constraint makes this helper function suitable for entities + * that support a single active source at a time. + * + * Return: A pointer to the remote pad, or one of the following error pointers + * if an error occurs: + * + * * -ENOTUNIQ - Multiple links are enabled + * * -ENOLINK - No connected pad found + */ +static inline struct media_pad * +media_entity_remote_source_pad_unique(const struct media_entity *entity) +{ + return media_entity_remote_pad_unique(entity, MEDIA_PAD_FL_SOURCE); +} + +/** * media_entity_is_streaming - Test if an entity is part of a streaming pipeline * @entity: The entity * |