|
|
@@ -306,3 +306,158 @@ media_entity_create_link(struct media_entity *source, u16 source_pad,
|
|
|
return 0;
|
|
|
}
|
|
|
EXPORT_SYMBOL_GPL(media_entity_create_link);
|
|
|
+
|
|
|
+static int __media_entity_setup_link_notify(struct media_link *link, u32 flags)
|
|
|
+{
|
|
|
+ const u32 mask = MEDIA_LNK_FL_ENABLED;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ /* Notify both entities. */
|
|
|
+ ret = media_entity_call(link->source->entity, link_setup,
|
|
|
+ link->source, link->sink, flags);
|
|
|
+ if (ret < 0 && ret != -ENOIOCTLCMD)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ ret = media_entity_call(link->sink->entity, link_setup,
|
|
|
+ link->sink, link->source, flags);
|
|
|
+ if (ret < 0 && ret != -ENOIOCTLCMD) {
|
|
|
+ media_entity_call(link->source->entity, link_setup,
|
|
|
+ link->source, link->sink, link->flags);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ link->flags = (link->flags & ~mask) | (flags & mask);
|
|
|
+ link->reverse->flags = link->flags;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * __media_entity_setup_link - Configure a media link
|
|
|
+ * @link: The link being configured
|
|
|
+ * @flags: Link configuration flags
|
|
|
+ *
|
|
|
+ * The bulk of link setup is handled by the two entities connected through the
|
|
|
+ * link. This function notifies both entities of the link configuration change.
|
|
|
+ *
|
|
|
+ * If the link is immutable or if the current and new configuration are
|
|
|
+ * identical, return immediately.
|
|
|
+ *
|
|
|
+ * The user is expected to hold link->source->parent->mutex. If not,
|
|
|
+ * media_entity_setup_link() should be used instead.
|
|
|
+ */
|
|
|
+int __media_entity_setup_link(struct media_link *link, u32 flags)
|
|
|
+{
|
|
|
+ struct media_device *mdev;
|
|
|
+ struct media_entity *source, *sink;
|
|
|
+ int ret = -EBUSY;
|
|
|
+
|
|
|
+ if (link == NULL)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ if (link->flags & MEDIA_LNK_FL_IMMUTABLE)
|
|
|
+ return link->flags == flags ? 0 : -EINVAL;
|
|
|
+
|
|
|
+ if (link->flags == flags)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ source = link->source->entity;
|
|
|
+ sink = link->sink->entity;
|
|
|
+
|
|
|
+ mdev = source->parent;
|
|
|
+
|
|
|
+ if ((flags & MEDIA_LNK_FL_ENABLED) && mdev->link_notify) {
|
|
|
+ ret = mdev->link_notify(link->source, link->sink,
|
|
|
+ MEDIA_LNK_FL_ENABLED);
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = __media_entity_setup_link_notify(link, flags);
|
|
|
+ if (ret < 0)
|
|
|
+ goto err;
|
|
|
+
|
|
|
+ if (!(flags & MEDIA_LNK_FL_ENABLED) && mdev->link_notify)
|
|
|
+ mdev->link_notify(link->source, link->sink, 0);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+err:
|
|
|
+ if ((flags & MEDIA_LNK_FL_ENABLED) && mdev->link_notify)
|
|
|
+ mdev->link_notify(link->source, link->sink, 0);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+int media_entity_setup_link(struct media_link *link, u32 flags)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ mutex_lock(&link->source->entity->parent->graph_mutex);
|
|
|
+ ret = __media_entity_setup_link(link, flags);
|
|
|
+ mutex_unlock(&link->source->entity->parent->graph_mutex);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(media_entity_setup_link);
|
|
|
+
|
|
|
+/**
|
|
|
+ * media_entity_find_link - Find a link between two pads
|
|
|
+ * @source: Source pad
|
|
|
+ * @sink: Sink pad
|
|
|
+ *
|
|
|
+ * Return a pointer to the link between the two entities. If no such link
|
|
|
+ * exists, return NULL.
|
|
|
+ */
|
|
|
+struct media_link *
|
|
|
+media_entity_find_link(struct media_pad *source, struct media_pad *sink)
|
|
|
+{
|
|
|
+ struct media_link *link;
|
|
|
+ unsigned int i;
|
|
|
+
|
|
|
+ for (i = 0; i < source->entity->num_links; ++i) {
|
|
|
+ link = &source->entity->links[i];
|
|
|
+
|
|
|
+ if (link->source->entity == source->entity &&
|
|
|
+ link->source->index == source->index &&
|
|
|
+ link->sink->entity == sink->entity &&
|
|
|
+ link->sink->index == sink->index)
|
|
|
+ return link;
|
|
|
+ }
|
|
|
+
|
|
|
+ return NULL;
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(media_entity_find_link);
|
|
|
+
|
|
|
+/**
|
|
|
+ * media_entity_remote_source - Find the source pad at the remote end of a link
|
|
|
+ * @pad: Sink pad at the local end of the link
|
|
|
+ *
|
|
|
+ * Search for a remote source pad connected to the given sink pad by iterating
|
|
|
+ * over all links originating or terminating at that pad until an enabled link
|
|
|
+ * is found.
|
|
|
+ *
|
|
|
+ * Return a pointer to the pad at the remote end of the first found enabled
|
|
|
+ * link, or NULL if no enabled link has been found.
|
|
|
+ */
|
|
|
+struct media_pad *media_entity_remote_source(struct media_pad *pad)
|
|
|
+{
|
|
|
+ unsigned int i;
|
|
|
+
|
|
|
+ for (i = 0; i < pad->entity->num_links; i++) {
|
|
|
+ struct media_link *link = &pad->entity->links[i];
|
|
|
+
|
|
|
+ if (!(link->flags & MEDIA_LNK_FL_ENABLED))
|
|
|
+ continue;
|
|
|
+
|
|
|
+ if (link->source == pad)
|
|
|
+ return link->sink;
|
|
|
+
|
|
|
+ if (link->sink == pad)
|
|
|
+ return link->source;
|
|
|
+ }
|
|
|
+
|
|
|
+ return NULL;
|
|
|
+
|
|
|
+}
|
|
|
+EXPORT_SYMBOL_GPL(media_entity_remote_source);
|
Laurent Pinchart