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[media] media: Add an API to manage entity enumerations

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This is useful in e.g. knowing whether certain operations have already
been performed for an entity. The users include the framework itself (for
graph walking) and a number of drivers.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Sakari Ailus
2015-12-16 11:44:32 -02:00
committed by Mauro Carvalho Chehab
parent 665faa971d
commit c8d54cd53b
3 changed files with 188 additions and 8 deletions
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15
include/media/media-device.h
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@@ -341,6 +341,21 @@ struct media_device {
/* media_devnode to media_device */
#define to_media_device(node) container_of(node, struct media_device, devnode)
/**
* media_entity_enum_init - Initialise an entity enumeration
*
* @e: Entity enumeration to be initialised
* @mdev: The related media device
*
* Returns zero on success or a negative error code.
*/
static inline __must_check int media_entity_enum_init(
struct media_entity_enum *ent_enum, struct media_device *mdev)
{
return __media_entity_enum_init(ent_enum,
mdev->entity_internal_idx_max + 1);
}
/**
* media_device_init() - Initializes a media device element
*