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[media] media-entitiy: add a function to create multiple links

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Sometimes, it is desired to create 1:n and n:1 or even
n:n links between different entities with the same
function.

This is actually needed to support DVB devices that
have multiple frontends. While we could do a function
like that internally at the DVB core, such function is
generic enough to be at media-entity, and it could be
useful on some other places.

So, add such function.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab
2015-12-30 09:45:48 -02:00
parent 33c6853347
commit b01cc9ce7c
2 changed files with 116 additions and 0 deletions
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drivers/media/media-entity.c
+65
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@@ -625,6 +625,71 @@ media_create_pad_link(struct media_entity *source, u16 source_pad,
}
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;