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[media] media_device: add a topology version field

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Every time a graph object is added or removed, the version
of the topology changes. That's a requirement for the new
MEDIA_IOC_G_TOPOLOGY, in order to allow userspace to know
that the topology has changed after a previous call to it.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab 2015-08-23 09:40:26 -03:00
parent 9155d859b6
commit 2521fdac28
2 changed files with 9 additions and 0 deletions
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5
drivers/media/media-entity.c
View file

@ -173,6 +173,9 @@ void media_gobj_init(struct media_device *mdev,
list_add_tail(&gobj->list, &mdev->interfaces);
break;
}
mdev->topology_version++;
dev_dbg_obj(__func__, gobj);
}
@ -187,6 +190,8 @@ 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);
}

4
include/media/media-device.h
View file

@ -41,6 +41,8 @@ struct device;
* @bus_info: Unique and stable device location identifier
* @hw_revision: Hardware device revision
* @driver_version: Device driver version
* @topology_version: Monotonic counter for storing the version of the graph
* topology. Should be incremented each time the topology changes.
* @entity_id: Unique ID used on the last entity registered
* @pad_id: Unique ID used on the last pad registered
* @link_id: Unique ID used on the last link registered
@ -74,6 +76,8 @@ struct media_device {
u32 hw_revision;
u32 driver_version;
u32 topology_version;
u32 entity_id;
u32 pad_id;
u32 link_id;