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[media] media: Media Controller register/unregister entity_notify API

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Add new interfaces to register and unregister entity_notify
hook to media device. These interfaces allow drivers to add
hooks to take appropriate actions when new entities get added
to a shared media device. For example, au0828 bridge driver
registers an entity_notify hook to create links as needed
between media graph nodes.

[mchehab@osg.samsung.com: simple comments should be /* and not /**]

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Shuah Khan
2016-02-11 21:41:21 -02:00
committed by Mauro Carvalho Chehab
parent 7a2eba12ff
commit afcbdb5589
2 changed files with 98 additions and 0 deletions
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42
drivers/media/media-device.c
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@@ -542,6 +542,7 @@ static void media_device_release(struct media_devnode *mdev)
int __must_check media_device_register_entity(struct media_device *mdev,
struct media_entity *entity)
{
struct media_entity_notify *notify, *next;
unsigned int i;
int ret;
@@ -581,6 +582,11 @@ int __must_check media_device_register_entity(struct media_device *mdev,
media_gobj_create(mdev, MEDIA_GRAPH_PAD,
&entity->pads[i].graph_obj);
/* invoke entity_notify callbacks */
list_for_each_entry_safe(notify, next, &mdev->entity_notify, list) {
(notify)->notify(entity, notify->notify_data);
}
spin_unlock(&mdev->lock);
return 0;
@@ -614,6 +620,8 @@ static void __media_device_unregister_entity(struct media_entity *entity)
/* Remove the entity */
media_gobj_destroy(&entity->graph_obj);
/* invoke entity_notify callbacks to handle entity removal?? */
entity->graph_obj.mdev = NULL;
}
@@ -646,6 +654,7 @@ void media_device_init(struct media_device *mdev)
INIT_LIST_HEAD(&mdev->interfaces);
INIT_LIST_HEAD(&mdev->pads);
INIT_LIST_HEAD(&mdev->links);
INIT_LIST_HEAD(&mdev->entity_notify);
spin_lock_init(&mdev->lock);
mutex_init(&mdev->graph_mutex);
ida_init(&mdev->entity_internal_idx);
@@ -691,11 +700,40 @@ int __must_check __media_device_register(struct media_device *mdev,
}
EXPORT_SYMBOL_GPL(__media_device_register);
int __must_check media_device_register_entity_notify(struct media_device *mdev,
struct media_entity_notify *nptr)
{
spin_lock(&mdev->lock);
list_add_tail(&nptr->list, &mdev->entity_notify);
spin_unlock(&mdev->lock);
return 0;
}
EXPORT_SYMBOL_GPL(media_device_register_entity_notify);
/*
* Note: Should be called with mdev->lock held.
*/
static void __media_device_unregister_entity_notify(struct media_device *mdev,
struct media_entity_notify *nptr)
{
list_del(&nptr->list);
}
void media_device_unregister_entity_notify(struct media_device *mdev,
struct media_entity_notify *nptr)
{
spin_lock(&mdev->lock);
__media_device_unregister_entity_notify(mdev, nptr);
spin_unlock(&mdev->lock);
}
EXPORT_SYMBOL_GPL(media_device_unregister_entity_notify);
void media_device_unregister(struct media_device *mdev)
{
struct media_entity *entity;
struct media_entity *next;
struct media_interface *intf, *tmp_intf;
struct media_entity_notify *notify, *nextp;
if (mdev == NULL)
return;
@@ -712,6 +750,10 @@ void media_device_unregister(struct media_device *mdev)
list_for_each_entry_safe(entity, next, &mdev->entities, graph_obj.list)
__media_device_unregister_entity(entity);
/* Remove all entity_notify callbacks from the media device */
list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list)
__media_device_unregister_entity_notify(mdev, notify);
/* Remove all interfaces from the media device */
list_for_each_entry_safe(intf, tmp_intf, &mdev->interfaces,
graph_obj.list) {