/*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <media/media-entity.h>
#include <media/media-device.h>
/**
* 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 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 "frontend";
case MEDIA_INTF_T_DVB_DEMUX:
return "demux";
case MEDIA_INTF_T_DVB_DVR:
return "DVR";
case MEDIA_INTF_T_DVB_CA:
return "CA";
case MEDIA_INTF_T_DVB_NET:
return "dvbnet";
case MEDIA_INTF_T_V4L_VIDEO:
return "video";
case MEDIA_INTF_T_V4L_VBI:
return "vbi";
case MEDIA_INTF_T_V4L_RADIO:
return "radio";
case MEDIA_INTF_T_V4L_SUBDEV:
return "v4l2-subdev";
case MEDIA_INTF_T_V4L_SWRADIO:
return "swradio";
default:
return "unknown-intf";
}
};
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 0x%08x entity#%d: '%s'\n",
event_name, gobj->id, media_localid(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 0x%08x link#%d: %s#%d ==> %s#%d\n",
event_name, gobj->id, media_localid(gobj),
gobj_type(media_type(link->gobj0)),
media_localid(link->gobj0),
gobj_type(media_type(link->gobj1)),
media_localid(link->gobj1));
break;
}
case MEDIA_GRAPH_PAD:
{
struct media_pad *pad = gobj_to_pad(gobj);
dev_dbg(gobj->mdev->dev,
"%s: id 0x%08x %s%spad#%d: '%s':%d\n",
event_name, gobj->id,
pad->flags & MEDIA_PAD_FL_SINK ? " sink " : "",
pad->flags & MEDIA_PAD_FL_SOURCE ? "source " : "",
media_localid(gobj),
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 0x%08x intf_devnode#%d: %s - major: %d, minor: %d\n",
event_name, gobj->id, media_localid(gobj),
intf_type(intf),
devnode->major, devnode->minor);
break;
}
}
#endif
}
/**
* media_gobj_init - Initialize a graph object
*
* @mdev: Pointer to the media_device that contains the object
* @type: Type of the object
* @gobj: Pointer to the object
*
* This routine initializes the embedded struct media_gobj inside a
* media graph object. It is called automatically if media_*_create()
* calls are used. However, if the object (entity, link, pad, interface)
* is embedded on some other object, this function should be called before
* registering the object at the media controller.
*/
void media_gobj_init(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 */
switch (type) {
case MEDIA_GRAPH_ENTITY:
gobj->id = media_gobj_gen_id(type, ++mdev->entity_id);
list_add_tail(&gobj->list, &mdev->entities);
break;
case MEDIA_GRAPH_PAD:
gobj->id = media_gobj_gen_id(type, ++mdev->pad_id);
list_add_tail(&gobj->list, &mdev->pads);
break;
case MEDIA_GRAPH_LINK:
gobj->id = media_gobj_gen_id(type, ++mdev->link_id);
list_add_tail(&gobj->list, &mdev->links);
break;
case MEDIA_GRAPH_INTF_DEVNODE:
gobj->id = media_gobj_gen_id(type, ++mdev->intf_devnode_id);
list_add_tail(&gobj->list, &mdev->interfaces);
break;
}
mdev->topology_version++;
dev_dbg_obj(__func__, gobj);
}
/**
* media_gobj_remove - Stop using a graph object on a media device
*
* @graph_obj: Pointer to the object
*
* This should be called at media_device_unregister_*() routines
*/
void media_gobj_remove(struct media_gobj *gobj)
{
dev_dbg_obj(__func__, gobj);
gobj->mdev->topology_version++;
/* Remove the object from mdev list */
list_del(&gobj->list);
}
/**
* media_entity_init - Initialize a media entity
*
* @num_pads: Total number of sink and source pads.
* @pads: Array of 'num_pads' pads.
*
* The total number of pads is an intrinsic property of entities known by the
* entity driver, while the total number of links depends on hardware design
* and is an extrinsic property unknown to the entity driver. However, in most
* use cases the number of links can safely be assumed to be equal to or
* larger than the number of pads.
*
* For those reasons the links array can be preallocated based on the number
* of pads and will be reallocated later if extra links need to be created.
*
* This function allocates a links array with enough space to hold at least
* 'num_pads' elements. The media_entity::max_links field will be set to the
* number of allocated elements.
*
* The pads array is managed by the entity driver and passed to
* media_entity_init() where its pointer will be stored in the entity structure.
*/
int
media_entity_init(struct media_entity *entity, u16 num_pads,
struct media_pad *pads)
{
struct media_device *mdev = entity->graph_obj.mdev;
unsigned int i;
entity->group_id = 0;
entity->num_links = 0;
entity->num_backlinks = 0;
entity->num_pads = num_pads;
entity->pads = pads;
if (mdev)
spin_lock(&mdev->lock);
for (i = 0; i < num_pads; i++) {
pads[i].entity = entity;
pads[i].index = i;
if (mdev)
media_gobj_init(mdev, MEDIA_GRAPH_PAD,
&entity->pads[i].graph_obj);
}
if (mdev)
spin_unlock(&mdev->lock);
return 0;
}
EXPORT_SYMBOL_GPL(media_entity_init);
void
media_entity_cleanup(struct media_entity *entity)
{
}
EXPORT_SYMBOL_GPL(media_entity_cleanup);
/* -----------------------------------------------------------------------------
* 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_entity_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_entity_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_entity_graph_walk_start - Start walking the media graph at a given entity
* @graph: Media graph structure that will be used to walk the graph
* @entity: Starting entity
*
* This function initializes the graph traversal structure to walk the entities
* graph starting at the given entity. The traversal structure must not be
* modified by the caller during graph traversal. When done the structure can
* safely be freed.
*/
void media_entity_graph_walk_start(struct media_entity_graph *graph,
struct media_entity *entity)
{
graph->top = 0;
graph->stack[graph->top].entity = NULL;
bitmap_zero(graph->entities, MEDIA_ENTITY_ENUM_MAX_ID);
if (WARN_ON(media_entity_id(entity) >= MEDIA_ENTITY_ENUM_MAX_ID))
return;
__set_bit(media_entity_id(entity), graph->entities);
stack_push(graph, entity);
}
EXPORT_SYMBOL_GPL(media_entity_graph_walk_start);
/**
* media_entity_graph_walk_next - Get the next entity in the graph
* @graph: Media graph structure
*
* Perform a depth-first traversal of the given media entities graph.
*
* The graph structure must have been previously initialized with a call to
* media_entity_graph_walk_start().
*
* Return the next entity in the graph or NULL if the whole graph have been
* traversed.
*/
struct media_entity *
media_entity_graph_walk_next(struct media_entity_graph *graph)
{
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)) {
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;
continue;
}
/* Get the entity in the other end of the link . */
next = media_entity_other(entity, link);
if (WARN_ON(media_entity_id(next) >= MEDIA_ENTITY_ENUM_MAX_ID))
return NULL;
/* Has the entity already been visited? */
if (__test_and_set_bit(media_entity_id(next), graph->entities)) {
link_top(graph) = link_top(graph)->next;
continue;
}
/* Push the new entity to stack and start over. */
link_top(graph) = link_top(graph)->next;
stack_push(graph, next);
}
return stack_pop(graph);
}
EXPORT_SYMBOL_GPL(media_entity_graph_walk_next);
/* -----------------------------------------------------------------------------
* Pipeline management
*/
/**
* media_entity_pipeline_start - Mark a pipeline as streaming
* @entity: Starting entity
* @pipe: Media pipeline to be assigned to all entities in the pipeline.
*
* Mark all entities connected to a given entity through enabled links, either
* directly or indirectly, as streaming. The given pipeline object is assigned to
* every entity in the pipeline and stored in the media_entity pipe field.
*
* Calls to this function can be nested, in which case the same number of
* media_entity_pipeline_stop() calls will be required to stop streaming. The
* pipeline pointer must be identical for all nested calls to
* media_entity_pipeline_start().
*/
__must_check int media_entity_pipeline_start(struct media_entity *entity,
struct media_pipeline *pipe)
{
struct media_device *mdev = entity->graph_obj.mdev;
struct media_entity_graph graph;
struct media_entity *entity_err = entity;
struct media_link *link;
int ret;
mutex_lock(&mdev->graph_mutex);
media_entity_graph_walk_start(&graph, entity);
while ((entity = media_entity_graph_walk_next(&graph))) {
DECLARE_BITMAP(active, MEDIA_ENTITY_MAX_PADS);
DECLARE_BITMAP(has_no_links, MEDIA_ENTITY_MAX_PADS);
entity->stream_count++;
WARN_ON(entity->pipe && entity->pipe != pipe);
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 = -EPIPE;
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;
}
}
mutex_unlock(&mdev->graph_mutex);
return 0;
error:
/*
* Link validation on graph failed. We revert what we did and
* return the error.
*/
media_entity_graph_walk_start(&graph, entity_err);
while ((entity_err = media_entity_graph_walk_next(&graph))) {
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;
}
mutex_unlock(&mdev->graph_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(media_entity_pipeline_start);
/**
* media_entity_pipeline_stop - Mark a pipeline as not streaming
* @entity: Starting entity
*
* Mark all entities connected to a given entity through enabled links, either
* directly or indirectly, as not streaming. The media_entity pipe field is
* reset to NULL.
*
* If multiple calls to media_entity_pipeline_start() have been made, the same
* number of calls to this function are required to mark the pipeline as not
* streaming.
*/
void media_entity_pipeline_stop(struct media_entity *entity)
{
struct media_device *mdev = entity->graph_obj.mdev;
struct media_entity_graph graph;
mutex_lock(&mdev->graph_mutex);
media_entity_graph_walk_start(&graph, entity);
while ((entity = media_entity_graph_walk_next(&graph))) {
entity->stream_count--;
if (entity->stream_count == 0)
entity->pipe = NULL;
}
mutex_unlock(&mdev->graph_mutex);
}
EXPORT_SYMBOL_GPL(media_entity_pipeline_stop);
/* -----------------------------------------------------------------------------
* Module use count
*/
/*
* media_entity_get - Get a reference to the parent module
* @entity: The entity
*
* Get a reference to the parent media device module.
*
* The function will return immediately if @entity is NULL.
*
* Return a pointer to the entity on success or NULL on failure.
*/
struct media_entity *media_entity_get(struct media_entity *entity)
{
if (entity == NULL)
return NULL;
if (entity->graph_obj.mdev->dev &&
!try_module_get(entity->graph_obj.mdev->dev->driver->owner))
return NULL;
return entity;
}
EXPORT_SYMBOL_GPL(media_entity_get);
/*
* media_entity_put - Release the reference to the parent module
* @entity: The entity
*
* Release the reference count acquired by media_entity_get().
*
* The function will return immediately if @entity is NULL.
*/
void media_entity_put(struct media_entity *entity)
{
if (entity == NULL)
return;
if (entity->graph_obj.mdev->dev)
module_put(entity->graph_obj.mdev->dev->driver->owner);
}
EXPORT_SYMBOL_GPL(media_entity_put);
/* -----------------------------------------------------------------------------
* 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);
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;
/* Initialize graph object embedded at the new link */
media_gobj_init(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_init(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);
static void __media_entity_remove_link(struct media_entity *entity,
struct media_link *link)
{
struct media_link *rlink, *tmp;
struct media_entity *remote;
unsigned int r = 0;
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) {
r++;
continue;
}
if (link->source->entity == entity)
remote->num_backlinks--;
/* Remove the remote link */
list_del(&rlink->list);
media_gobj_remove(&rlink->graph_obj);
kfree(rlink);
if (--remote->num_links == 0)
break;
}
list_del(&link->list);
media_gobj_remove(&link->graph_obj);
kfree(link);
}
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)
{
/* Do nothing if the entity is not registered. */
if (entity->graph_obj.mdev == NULL)
return;
spin_lock(&entity->graph_obj.mdev->lock);
__media_entity_remove_links(entity);
spin_unlock(&entity->graph_obj.mdev->lock);
}
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;
}
/**
* __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)
{
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->link_notify) {
ret = mdev->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->link_notify)
mdev->link_notify(link, flags, MEDIA_DEV_NOTIFY_POST_LINK_CH);
return ret;
}
int media_entity_setup_link(struct media_link *link, u32 flags)
{
int ret;
spin_lock(&link->source->entity->graph_obj.mdev->lock);
ret = __media_entity_setup_link(link, flags);
spin_unlock(&link->source->entity->graph_obj.mdev->lock);
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;
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);
/**
* media_entity_remote_pad - Find the pad at the remote end of a link
* @pad: Pad at the local end of the link
*
* Search for a remote pad connected to the given 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_pad(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_init(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_remove(&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;
/* Initialize graph object embedded at the new link */
media_gobj_init(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_remove(&link->graph_obj);
kfree(link);
}
EXPORT_SYMBOL_GPL(__media_remove_intf_link);
void media_remove_intf_link(struct media_link *link)
{
spin_lock(&link->graph_obj.mdev->lock);
__media_remove_intf_link(link);
spin_unlock(&link->graph_obj.mdev->lock);
}
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)
{
/* Do nothing if the intf is not registered. */
if (intf->graph_obj.mdev == NULL)
return;
spin_lock(&intf->graph_obj.mdev->lock);
__media_remove_intf_links(intf);
spin_unlock(&intf->graph_obj.mdev->lock);
}
EXPORT_SYMBOL_GPL(media_remove_intf_links);
