media: move drivers/media/media-* to drivers/media/mc/mc-*

It is really weird that the media controller sources are all top-level
in drivers/media. It is a bit of a left-over from long ago when most
media sources were all at the top-level. At some point we reorganized
the directory structure, but the media-*.c sources where never moved
to their own directory.

So create a new mc directory and move all sources there. Also rename
the prefix from media- to mc-.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 0 insertions, 1036 deletions

diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c
deleted file mode 100644
index a998a2e0ea1d..000000000000
--- a/drivers/media/media-entity.c
+++ /dev/null
@@ -1,1036 +0,0 @@
-/*
- * Media entity
- *
- * Copyright (C) 2010 Nokia Corporation
- *
- * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
- *	     Sakari Ailus <sakari.ailus@iki.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/bitmap.h>
-#include <linux/property.h>
-#include <linux/slab.h>
-#include <media/media-entity.h>
-#include <media/media-device.h>
-
-static inline const char *gobj_type(enum media_gobj_type type)
-{
-	switch (type) {
-	case MEDIA_GRAPH_ENTITY:
-		return "entity";
-	case MEDIA_GRAPH_PAD:
-		return "pad";
-	case MEDIA_GRAPH_LINK:
-		return "link";
-	case MEDIA_GRAPH_INTF_DEVNODE:
-		return "intf-devnode";
-	default:
-		return "unknown";
-	}
-}
-
-static inline const char *intf_type(struct media_interface *intf)
-{
-	switch (intf->type) {
-	case MEDIA_INTF_T_DVB_FE:
-		return "dvb-frontend";
-	case MEDIA_INTF_T_DVB_DEMUX:
-		return "dvb-demux";
-	case MEDIA_INTF_T_DVB_DVR:
-		return "dvb-dvr";
-	case MEDIA_INTF_T_DVB_CA:
-		return  "dvb-ca";
-	case MEDIA_INTF_T_DVB_NET:
-		return "dvb-net";
-	case MEDIA_INTF_T_V4L_VIDEO:
-		return "v4l-video";
-	case MEDIA_INTF_T_V4L_VBI:
-		return "v4l-vbi";
-	case MEDIA_INTF_T_V4L_RADIO:
-		return "v4l-radio";
-	case MEDIA_INTF_T_V4L_SUBDEV:
-		return "v4l-subdev";
-	case MEDIA_INTF_T_V4L_SWRADIO:
-		return "v4l-swradio";
-	case MEDIA_INTF_T_V4L_TOUCH:
-		return "v4l-touch";
-	default:
-		return "unknown-intf";
-	}
-};
-
-__must_check int __media_entity_enum_init(struct media_entity_enum *ent_enum,
-					  int idx_max)
-{
-	idx_max = ALIGN(idx_max, BITS_PER_LONG);
-	ent_enum->bmap = kcalloc(idx_max / BITS_PER_LONG, sizeof(long),
-				 GFP_KERNEL);
-	if (!ent_enum->bmap)
-		return -ENOMEM;
-
-	bitmap_zero(ent_enum->bmap, idx_max);
-	ent_enum->idx_max = idx_max;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(__media_entity_enum_init);
-
-void media_entity_enum_cleanup(struct media_entity_enum *ent_enum)
-{
-	kfree(ent_enum->bmap);
-}
-EXPORT_SYMBOL_GPL(media_entity_enum_cleanup);
-
-/**
- *  dev_dbg_obj - Prints in debug mode a change on some object
- *
- * @event_name:	Name of the event to report. Could be __func__
- * @gobj:	Pointer to the object
- *
- * Enabled only if DEBUG or CONFIG_DYNAMIC_DEBUG. Otherwise, it
- * won't produce any code.
- */
-static void dev_dbg_obj(const char *event_name,  struct media_gobj *gobj)
-{
-#if defined(DEBUG) || defined (CONFIG_DYNAMIC_DEBUG)
-	switch (media_type(gobj)) {
-	case MEDIA_GRAPH_ENTITY:
-		dev_dbg(gobj->mdev->dev,
-			"%s id %u: entity '%s'\n",
-			event_name, media_id(gobj),
-			gobj_to_entity(gobj)->name);
-		break;
-	case MEDIA_GRAPH_LINK:
-	{
-		struct media_link *link = gobj_to_link(gobj);
-
-		dev_dbg(gobj->mdev->dev,
-			"%s id %u: %s link id %u ==> id %u\n",
-			event_name, media_id(gobj),
-			media_type(link->gobj0) == MEDIA_GRAPH_PAD ?
-				"data" : "interface",
-			media_id(link->gobj0),
-			media_id(link->gobj1));
-		break;
-	}
-	case MEDIA_GRAPH_PAD:
-	{
-		struct media_pad *pad = gobj_to_pad(gobj);
-
-		dev_dbg(gobj->mdev->dev,
-			"%s id %u: %s%spad '%s':%d\n",
-			event_name, media_id(gobj),
-			pad->flags & MEDIA_PAD_FL_SINK   ? "sink " : "",
-			pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "",
-			pad->entity->name, pad->index);
-		break;
-	}
-	case MEDIA_GRAPH_INTF_DEVNODE:
-	{
-		struct media_interface *intf = gobj_to_intf(gobj);
-		struct media_intf_devnode *devnode = intf_to_devnode(intf);
-
-		dev_dbg(gobj->mdev->dev,
-			"%s id %u: intf_devnode %s - major: %d, minor: %d\n",
-			event_name, media_id(gobj),
-			intf_type(intf),
-			devnode->major, devnode->minor);
-		break;
-	}
-	}
-#endif
-}
-
-void media_gobj_create(struct media_device *mdev,
-			   enum media_gobj_type type,
-			   struct media_gobj *gobj)
-{
-	BUG_ON(!mdev);
-
-	gobj->mdev = mdev;
-
-	/* Create a per-type unique object ID */
-	gobj->id = media_gobj_gen_id(type, ++mdev->id);
-
-	switch (type) {
-	case MEDIA_GRAPH_ENTITY:
-		list_add_tail(&gobj->list, &mdev->entities);
-		break;
-	case MEDIA_GRAPH_PAD:
-		list_add_tail(&gobj->list, &mdev->pads);
-		break;
-	case MEDIA_GRAPH_LINK:
-		list_add_tail(&gobj->list, &mdev->links);
-		break;
-	case MEDIA_GRAPH_INTF_DEVNODE:
-		list_add_tail(&gobj->list, &mdev->interfaces);
-		break;
-	}
-
-	mdev->topology_version++;
-
-	dev_dbg_obj(__func__, gobj);
-}
-
-void media_gobj_destroy(struct media_gobj *gobj)
-{
-	/* Do nothing if the object is not linked. */
-	if (gobj->mdev == NULL)
-		return;
-
-	dev_dbg_obj(__func__, gobj);
-
-	gobj->mdev->topology_version++;
-
-	/* Remove the object from mdev list */
-	list_del(&gobj->list);
-
-	gobj->mdev = NULL;
-}
-
-/*
- * TODO: Get rid of this.
- */
-#define MEDIA_ENTITY_MAX_PADS		512
-
-int media_entity_pads_init(struct media_entity *entity, u16 num_pads,
-			   struct media_pad *pads)
-{
-	struct media_device *mdev = entity->graph_obj.mdev;
-	unsigned int i;
-
-	if (num_pads >= MEDIA_ENTITY_MAX_PADS)
-		return -E2BIG;
-
-	entity->num_pads = num_pads;
-	entity->pads = pads;
-
-	if (mdev)
-		mutex_lock(&mdev->graph_mutex);
-
-	for (i = 0; i < num_pads; i++) {
-		pads[i].entity = entity;
-		pads[i].index = i;
-		if (mdev)
-			media_gobj_create(mdev, MEDIA_GRAPH_PAD,
-					&entity->pads[i].graph_obj);
-	}
-
-	if (mdev)
-		mutex_unlock(&mdev->graph_mutex);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(media_entity_pads_init);
-
-/* -----------------------------------------------------------------------------
- * Graph traversal
- */
-
-static struct media_entity *
-media_entity_other(struct media_entity *entity, struct media_link *link)
-{
-	if (link->source->entity == entity)
-		return link->sink->entity;
-	else
-		return link->source->entity;
-}
-
-/* push an entity to traversal stack */
-static void stack_push(struct media_graph *graph,
-		       struct media_entity *entity)
-{
-	if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) {
-		WARN_ON(1);
-		return;
-	}
-	graph->top++;
-	graph->stack[graph->top].link = entity->links.next;
-	graph->stack[graph->top].entity = entity;
-}
-
-static struct media_entity *stack_pop(struct media_graph *graph)
-{
-	struct media_entity *entity;
-
-	entity = graph->stack[graph->top].entity;
-	graph->top--;
-
-	return entity;
-}
-
-#define link_top(en)	((en)->stack[(en)->top].link)
-#define stack_top(en)	((en)->stack[(en)->top].entity)
-
-/**
- * media_graph_walk_init - Allocate resources for graph walk
- * @graph: Media graph structure that will be used to walk the graph
- * @mdev: Media device
- *
- * Reserve resources for graph walk in media device's current
- * state. The memory must be released using
- * media_graph_walk_free().
- *
- * Returns error on failure, zero on success.
- */
-__must_check int media_graph_walk_init(
-	struct media_graph *graph, struct media_device *mdev)
-{
-	return media_entity_enum_init(&graph->ent_enum, mdev);
-}
-EXPORT_SYMBOL_GPL(media_graph_walk_init);
-
-/**
- * media_graph_walk_cleanup - Release resources related to graph walking
- * @graph: Media graph structure that was used to walk the graph
- */
-void media_graph_walk_cleanup(struct media_graph *graph)
-{
-	media_entity_enum_cleanup(&graph->ent_enum);
-}
-EXPORT_SYMBOL_GPL(media_graph_walk_cleanup);
-
-void media_graph_walk_start(struct media_graph *graph,
-			    struct media_entity *entity)
-{
-	media_entity_enum_zero(&graph->ent_enum);
-	media_entity_enum_set(&graph->ent_enum, entity);
-
-	graph->top = 0;
-	graph->stack[graph->top].entity = NULL;
-	stack_push(graph, entity);
-	dev_dbg(entity->graph_obj.mdev->dev,
-		"begin graph walk at '%s'\n", entity->name);
-}
-EXPORT_SYMBOL_GPL(media_graph_walk_start);
-
-static void media_graph_walk_iter(struct media_graph *graph)
-{
-	struct media_entity *entity = stack_top(graph);
-	struct media_link *link;
-	struct media_entity *next;
-
-	link = list_entry(link_top(graph), typeof(*link), list);
-
-	/* The link is not enabled so we do not follow. */
-	if (!(link->flags & MEDIA_LNK_FL_ENABLED)) {
-		link_top(graph) = link_top(graph)->next;
-		dev_dbg(entity->graph_obj.mdev->dev,
-			"walk: skipping disabled link '%s':%u -> '%s':%u\n",
-			link->source->entity->name, link->source->index,
-			link->sink->entity->name, link->sink->index);
-		return;
-	}
-
-	/* Get the entity in the other end of the link . */
-	next = media_entity_other(entity, link);
-
-	/* Has the entity already been visited? */
-	if (media_entity_enum_test_and_set(&graph->ent_enum, next)) {
-		link_top(graph) = link_top(graph)->next;
-		dev_dbg(entity->graph_obj.mdev->dev,
-			"walk: skipping entity '%s' (already seen)\n",
-			next->name);
-		return;
-	}
-
-	/* Push the new entity to stack and start over. */
-	link_top(graph) = link_top(graph)->next;
-	stack_push(graph, next);
-	dev_dbg(entity->graph_obj.mdev->dev, "walk: pushing '%s' on stack\n",
-		next->name);
-}
-
-struct media_entity *media_graph_walk_next(struct media_graph *graph)
-{
-	struct media_entity *entity;
-
-	if (stack_top(graph) == NULL)
-		return NULL;
-
-	/*
-	 * Depth first search. Push entity to stack and continue from
-	 * top of the stack until no more entities on the level can be
-	 * found.
-	 */
-	while (link_top(graph) != &stack_top(graph)->links)
-		media_graph_walk_iter(graph);
-
-	entity = stack_pop(graph);
-	dev_dbg(entity->graph_obj.mdev->dev,
-		"walk: returning entity '%s'\n", entity->name);
-
-	return entity;
-}
-EXPORT_SYMBOL_GPL(media_graph_walk_next);
-
-int media_entity_get_fwnode_pad(struct media_entity *entity,
-				struct fwnode_handle *fwnode,
-				unsigned long direction_flags)
-{
-	struct fwnode_endpoint endpoint;
-	unsigned int i;
-	int ret;
-
-	if (!entity->ops || !entity->ops->get_fwnode_pad) {
-		for (i = 0; i < entity->num_pads; i++) {
-			if (entity->pads[i].flags & direction_flags)
-				return i;
-		}
-
-		return -ENXIO;
-	}
-
-	ret = fwnode_graph_parse_endpoint(fwnode, &endpoint);
-	if (ret)
-		return ret;
-
-	ret = entity->ops->get_fwnode_pad(&endpoint);
-	if (ret < 0)
-		return ret;
-
-	if (ret >= entity->num_pads)
-		return -ENXIO;
-
-	if (!(entity->pads[ret].flags & direction_flags))
-		return -ENXIO;
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(media_entity_get_fwnode_pad);
-
-/* -----------------------------------------------------------------------------
- * Pipeline management
- */
-
-__must_check int __media_pipeline_start(struct media_entity *entity,
-					struct media_pipeline *pipe)
-{
-	struct media_device *mdev = entity->graph_obj.mdev;
-	struct media_graph *graph = &pipe->graph;
-	struct media_entity *entity_err = entity;
-	struct media_link *link;
-	int ret;
-
-	if (!pipe->streaming_count++) {
-		ret = media_graph_walk_init(&pipe->graph, mdev);
-		if (ret)
-			goto error_graph_walk_start;
-	}
-
-	media_graph_walk_start(&pipe->graph, entity);
-
-	while ((entity = media_graph_walk_next(graph))) {
-		DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS);
-		DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS);
-
-		entity->stream_count++;
-
-		if (entity->pipe && entity->pipe != pipe) {
-			pr_err("Pipe active for %s. Can't start for %s\n",
-				entity->name,
-				entity_err->name);
-			ret = -EBUSY;
-			goto error;
-		}
-
-		entity->pipe = pipe;
-
-		/* Already streaming --- no need to check. */
-		if (entity->stream_count > 1)
-			continue;
-
-		if (!entity->ops || !entity->ops->link_validate)
-			continue;
-
-		bitmap_zero(active, entity->num_pads);
-		bitmap_fill(has_no_links, entity->num_pads);
-
-		list_for_each_entry(link, &entity->links, list) {
-			struct media_pad *pad = link->sink->entity == entity
-						? link->sink : link->source;
-
-			/* Mark that a pad is connected by a link. */
-			bitmap_clear(has_no_links, pad->index, 1);
-
-			/*
-			 * Pads that either do not need to connect or
-			 * are connected through an enabled link are
-			 * fine.
-			 */
-			if (!(pad->flags & MEDIA_PAD_FL_MUST_CONNECT) ||
-			    link->flags & MEDIA_LNK_FL_ENABLED)
-				bitmap_set(active, pad->index, 1);
-
-			/*
-			 * Link validation will only take place for
-			 * sink ends of the link that are enabled.
-			 */
-			if (link->sink != pad ||
-			    !(link->flags & MEDIA_LNK_FL_ENABLED))
-				continue;
-
-			ret = entity->ops->link_validate(link);
-			if (ret < 0 && ret != -ENOIOCTLCMD) {
-				dev_dbg(entity->graph_obj.mdev->dev,
-					"link validation failed for '%s':%u -> '%s':%u, error %d\n",
-					link->source->entity->name,
-					link->source->index,
-					entity->name, link->sink->index, ret);
-				goto error;
-			}
-		}
-
-		/* Either no links or validated links are fine. */
-		bitmap_or(active, active, has_no_links, entity->num_pads);
-
-		if (!bitmap_full(active, entity->num_pads)) {
-			ret = -ENOLINK;
-			dev_dbg(entity->graph_obj.mdev->dev,
-				"'%s':%u must be connected by an enabled link\n",
-				entity->name,
-				(unsigned)find_first_zero_bit(
-					active, entity->num_pads));
-			goto error;
-		}
-	}
-
-	return 0;
-
-error:
-	/*
-	 * Link validation on graph failed. We revert what we did and
-	 * return the error.
-	 */
-	media_graph_walk_start(graph, entity_err);
-
-	while ((entity_err = media_graph_walk_next(graph))) {
-		/* Sanity check for negative stream_count */
-		if (!WARN_ON_ONCE(entity_err->stream_count <= 0)) {
-			entity_err->stream_count--;
-			if (entity_err->stream_count == 0)
-				entity_err->pipe = NULL;
-		}
-
-		/*
-		 * We haven't increased stream_count further than this
-		 * so we quit here.
-		 */
-		if (entity_err == entity)
-			break;
-	}
-
-error_graph_walk_start:
-	if (!--pipe->streaming_count)
-		media_graph_walk_cleanup(graph);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(__media_pipeline_start);
-
-__must_check int media_pipeline_start(struct media_entity *entity,
-				      struct media_pipeline *pipe)
-{
-	struct media_device *mdev = entity->graph_obj.mdev;
-	int ret;
-
-	mutex_lock(&mdev->graph_mutex);
-	ret = __media_pipeline_start(entity, pipe);
-	mutex_unlock(&mdev->graph_mutex);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(media_pipeline_start);
-
-void __media_pipeline_stop(struct media_entity *entity)
-{
-	struct media_graph *graph = &entity->pipe->graph;
-	struct media_pipeline *pipe = entity->pipe;
-
-	/*
-	 * If the following check fails, the driver has performed an
-	 * unbalanced call to media_pipeline_stop()
-	 */
-	if (WARN_ON(!pipe))
-		return;
-
-	media_graph_walk_start(graph, entity);
-
-	while ((entity = media_graph_walk_next(graph))) {
-		/* Sanity check for negative stream_count */
-		if (!WARN_ON_ONCE(entity->stream_count <= 0)) {
-			entity->stream_count--;
-			if (entity->stream_count == 0)
-				entity->pipe = NULL;
-		}
-	}
-
-	if (!--pipe->streaming_count)
-		media_graph_walk_cleanup(graph);
-
-}
-EXPORT_SYMBOL_GPL(__media_pipeline_stop);
-
-void media_pipeline_stop(struct media_entity *entity)
-{
-	struct media_device *mdev = entity->graph_obj.mdev;
-
-	mutex_lock(&mdev->graph_mutex);
-	__media_pipeline_stop(entity);
-	mutex_unlock(&mdev->graph_mutex);
-}
-EXPORT_SYMBOL_GPL(media_pipeline_stop);
-
-/* -----------------------------------------------------------------------------
- * Links management
- */
-
-static struct media_link *media_add_link(struct list_head *head)
-{
-	struct media_link *link;
-
-	link = kzalloc(sizeof(*link), GFP_KERNEL);
-	if (link == NULL)
-		return NULL;
-
-	list_add_tail(&link->list, head);
-
-	return link;
-}
-
-static void __media_entity_remove_link(struct media_entity *entity,
-				       struct media_link *link)
-{
-	struct media_link *rlink, *tmp;
-	struct media_entity *remote;
-
-	if (link->source->entity == entity)
-		remote = link->sink->entity;
-	else
-		remote = link->source->entity;
-
-	list_for_each_entry_safe(rlink, tmp, &remote->links, list) {
-		if (rlink != link->reverse)
-			continue;
-
-		if (link->source->entity == entity)
-			remote->num_backlinks--;
-
-		/* Remove the remote link */
-		list_del(&rlink->list);
-		media_gobj_destroy(&rlink->graph_obj);
-		kfree(rlink);
-
-		if (--remote->num_links == 0)
-			break;
-	}
-	list_del(&link->list);
-	media_gobj_destroy(&link->graph_obj);
-	kfree(link);
-}
-
-int media_get_pad_index(struct media_entity *entity, bool is_sink,
-			enum media_pad_signal_type sig_type)
-{
-	int i;
-	bool pad_is_sink;
-
-	if (!entity)
-		return -EINVAL;
-
-	for (i = 0; i < entity->num_pads; i++) {
-		if (entity->pads[i].flags == MEDIA_PAD_FL_SINK)
-			pad_is_sink = true;
-		else if (entity->pads[i].flags == MEDIA_PAD_FL_SOURCE)
-			pad_is_sink = false;
-		else
-			continue;	/* This is an error! */
-
-		if (pad_is_sink != is_sink)
-			continue;
-		if (entity->pads[i].sig_type == sig_type)
-			return i;
-	}
-	return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(media_get_pad_index);
-
-int
-media_create_pad_link(struct media_entity *source, u16 source_pad,
-			 struct media_entity *sink, u16 sink_pad, u32 flags)
-{
-	struct media_link *link;
-	struct media_link *backlink;
-
-	BUG_ON(source == NULL || sink == NULL);
-	BUG_ON(source_pad >= source->num_pads);
-	BUG_ON(sink_pad >= sink->num_pads);
-
-	link = media_add_link(&source->links);
-	if (link == NULL)
-		return -ENOMEM;
-
-	link->source = &source->pads[source_pad];
-	link->sink = &sink->pads[sink_pad];
-	link->flags = flags & ~MEDIA_LNK_FL_INTERFACE_LINK;
-
-	/* Initialize graph object embedded at the new link */
-	media_gobj_create(source->graph_obj.mdev, MEDIA_GRAPH_LINK,
-			&link->graph_obj);
-
-	/* Create the backlink. Backlinks are used to help graph traversal and
-	 * are not reported to userspace.
-	 */
-	backlink = media_add_link(&sink->links);
-	if (backlink == NULL) {
-		__media_entity_remove_link(source, link);
-		return -ENOMEM;
-	}
-
-	backlink->source = &source->pads[source_pad];
-	backlink->sink = &sink->pads[sink_pad];
-	backlink->flags = flags;
-	backlink->is_backlink = true;
-
-	/* Initialize graph object embedded at the new link */
-	media_gobj_create(sink->graph_obj.mdev, MEDIA_GRAPH_LINK,
-			&backlink->graph_obj);
-
-	link->reverse = backlink;
-	backlink->reverse = link;
-
-	sink->num_backlinks++;
-	sink->num_links++;
-	source->num_links++;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(media_create_pad_link);
-
-int media_create_pad_links(const struct media_device *mdev,
-			   const u32 source_function,
-			   struct media_entity *source,
-			   const u16 source_pad,
-			   const u32 sink_function,
-			   struct media_entity *sink,
-			   const u16 sink_pad,
-			   u32 flags,
-			   const bool allow_both_undefined)
-{
-	struct media_entity *entity;
-	unsigned function;
-	int ret;
-
-	/* Trivial case: 1:1 relation */
-	if (source && sink)
-		return media_create_pad_link(source, source_pad,
-					     sink, sink_pad, flags);
-
-	/* Worse case scenario: n:n relation */
-	if (!source && !sink) {
-		if (!allow_both_undefined)
-			return 0;
-		media_device_for_each_entity(source, mdev) {
-			if (source->function != source_function)
-				continue;
-			media_device_for_each_entity(sink, mdev) {
-				if (sink->function != sink_function)
-					continue;
-				ret = media_create_pad_link(source, source_pad,
-							    sink, sink_pad,
-							    flags);
-				if (ret)
-					return ret;
-				flags &= ~(MEDIA_LNK_FL_ENABLED |
-					   MEDIA_LNK_FL_IMMUTABLE);
-			}
-		}
-		return 0;
-	}
-
-	/* Handle 1:n and n:1 cases */
-	if (source)
-		function = sink_function;
-	else
-		function = source_function;
-
-	media_device_for_each_entity(entity, mdev) {
-		if (entity->function != function)
-			continue;
-
-		if (source)
-			ret = media_create_pad_link(source, source_pad,
-						    entity, sink_pad, flags);
-		else
-			ret = media_create_pad_link(entity, source_pad,
-						    sink, sink_pad, flags);
-		if (ret)
-			return ret;
-		flags &= ~(MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE);
-	}
-	return 0;
-}
-EXPORT_SYMBOL_GPL(media_create_pad_links);
-
-void __media_entity_remove_links(struct media_entity *entity)
-{
-	struct media_link *link, *tmp;
-
-	list_for_each_entry_safe(link, tmp, &entity->links, list)
-		__media_entity_remove_link(entity, link);
-
-	entity->num_links = 0;
-	entity->num_backlinks = 0;
-}
-EXPORT_SYMBOL_GPL(__media_entity_remove_links);
-
-void media_entity_remove_links(struct media_entity *entity)
-{
-	struct media_device *mdev = entity->graph_obj.mdev;
-
-	/* Do nothing if the entity is not registered. */
-	if (mdev == NULL)
-		return;
-
-	mutex_lock(&mdev->graph_mutex);
-	__media_entity_remove_links(entity);
-	mutex_unlock(&mdev->graph_mutex);
-}
-EXPORT_SYMBOL_GPL(media_entity_remove_links);
-
-static int __media_entity_setup_link_notify(struct media_link *link, u32 flags)
-{
-	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 = flags;
-	link->reverse->flags = link->flags;
-
-	return 0;
-}
-
-int __media_entity_setup_link(struct media_link *link, u32 flags)
-{
-	const u32 mask = MEDIA_LNK_FL_ENABLED;
-	struct media_device *mdev;
-	struct media_entity *source, *sink;
-	int ret = -EBUSY;
-
-	if (link == NULL)
-		return -EINVAL;
-
-	/* The non-modifiable link flags must not be modified. */
-	if ((link->flags & ~mask) != (flags & ~mask))
-		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;
-
-	if (!(link->flags & MEDIA_LNK_FL_DYNAMIC) &&
-	    (source->stream_count || sink->stream_count))
-		return -EBUSY;
-
-	mdev = source->graph_obj.mdev;
-
-	if (mdev->ops && mdev->ops->link_notify) {
-		ret = mdev->ops->link_notify(link, flags,
-					     MEDIA_DEV_NOTIFY_PRE_LINK_CH);
-		if (ret < 0)
-			return ret;
-	}
-
-	ret = __media_entity_setup_link_notify(link, flags);
-
-	if (mdev->ops && mdev->ops->link_notify)
-		mdev->ops->link_notify(link, flags,
-				       MEDIA_DEV_NOTIFY_POST_LINK_CH);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(__media_entity_setup_link);
-
-int media_entity_setup_link(struct media_link *link, u32 flags)
-{
-	int ret;
-
-	mutex_lock(&link->graph_obj.mdev->graph_mutex);
-	ret = __media_entity_setup_link(link, flags);
-	mutex_unlock(&link->graph_obj.mdev->graph_mutex);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(media_entity_setup_link);
-
-struct media_link *
-media_entity_find_link(struct media_pad *source, struct media_pad *sink)
-{
-	struct media_link *link;
-
-	list_for_each_entry(link, &source->entity->links, list) {
-		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);
-
-struct media_pad *media_entity_remote_pad(const struct media_pad *pad)
-{
-	struct media_link *link;
-
-	list_for_each_entry(link, &pad->entity->links, list) {
-		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_pad);
-
-static void media_interface_init(struct media_device *mdev,
-				 struct media_interface *intf,
-				 u32 gobj_type,
-				 u32 intf_type, u32 flags)
-{
-	intf->type = intf_type;
-	intf->flags = flags;
-	INIT_LIST_HEAD(&intf->links);
-
-	media_gobj_create(mdev, gobj_type, &intf->graph_obj);
-}
-
-/* Functions related to the media interface via device nodes */
-
-struct media_intf_devnode *media_devnode_create(struct media_device *mdev,
-						u32 type, u32 flags,
-						u32 major, u32 minor)
-{
-	struct media_intf_devnode *devnode;
-
-	devnode = kzalloc(sizeof(*devnode), GFP_KERNEL);
-	if (!devnode)
-		return NULL;
-
-	devnode->major = major;
-	devnode->minor = minor;
-
-	media_interface_init(mdev, &devnode->intf, MEDIA_GRAPH_INTF_DEVNODE,
-			     type, flags);
-
-	return devnode;
-}
-EXPORT_SYMBOL_GPL(media_devnode_create);
-
-void media_devnode_remove(struct media_intf_devnode *devnode)
-{
-	media_remove_intf_links(&devnode->intf);
-	media_gobj_destroy(&devnode->intf.graph_obj);
-	kfree(devnode);
-}
-EXPORT_SYMBOL_GPL(media_devnode_remove);
-
-struct media_link *media_create_intf_link(struct media_entity *entity,
-					    struct media_interface *intf,
-					    u32 flags)
-{
-	struct media_link *link;
-
-	link = media_add_link(&intf->links);
-	if (link == NULL)
-		return NULL;
-
-	link->intf = intf;
-	link->entity = entity;
-	link->flags = flags | MEDIA_LNK_FL_INTERFACE_LINK;
-
-	/* Initialize graph object embedded at the new link */
-	media_gobj_create(intf->graph_obj.mdev, MEDIA_GRAPH_LINK,
-			&link->graph_obj);
-
-	return link;
-}
-EXPORT_SYMBOL_GPL(media_create_intf_link);
-
-void __media_remove_intf_link(struct media_link *link)
-{
-	list_del(&link->list);
-	media_gobj_destroy(&link->graph_obj);
-	kfree(link);
-}
-EXPORT_SYMBOL_GPL(__media_remove_intf_link);
-
-void media_remove_intf_link(struct media_link *link)
-{
-	struct media_device *mdev = link->graph_obj.mdev;
-
-	/* Do nothing if the intf is not registered. */
-	if (mdev == NULL)
-		return;
-
-	mutex_lock(&mdev->graph_mutex);
-	__media_remove_intf_link(link);
-	mutex_unlock(&mdev->graph_mutex);
-}
-EXPORT_SYMBOL_GPL(media_remove_intf_link);
-
-void __media_remove_intf_links(struct media_interface *intf)
-{
-	struct media_link *link, *tmp;
-
-	list_for_each_entry_safe(link, tmp, &intf->links, list)
-		__media_remove_intf_link(link);
-
-}
-EXPORT_SYMBOL_GPL(__media_remove_intf_links);
-
-void media_remove_intf_links(struct media_interface *intf)
-{
-	struct media_device *mdev = intf->graph_obj.mdev;
-
-	/* Do nothing if the intf is not registered. */
-	if (mdev == NULL)
-		return;
-
-	mutex_lock(&mdev->graph_mutex);
-	__media_remove_intf_links(intf);
-	mutex_unlock(&mdev->graph_mutex);
-}
-EXPORT_SYMBOL_GPL(media_remove_intf_links);