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* Media device
* Copyright (C) 2010 Nokia Corporation
* Contacts: Laurent Pinchart <>
* Sakari Ailus <>
* 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
* 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/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <media/media-devnode.h>
#include <media/media-entity.h>
struct device;
* struct media_device - Media device
* @dev: Parent device
* @devnode: Media device node
* @model: Device model name
* @serial: Device serial number (optional)
* @bus_info: Unique and stable device location identifier
* @hw_revision: Hardware device revision
* @driver_version: Device driver version
* @entity_id: ID of the next entity to be registered
* @entities: List of registered entities
* @lock: Entities list lock
* @graph_mutex: Entities graph operation lock
* @link_notify: Link state change notification callback
* This structure represents an abstract high-level media device. It allows easy
* access to entities and provides basic media device-level support. The
* structure can be allocated directly or embedded in a larger structure.
* The parent @dev is a physical device. It must be set before registering the
* media device.
* @model is a descriptive model name exported through sysfs. It doesn't have to
* be unique.
struct media_device {
/* dev->driver_data points to this struct. */
struct device *dev;
struct media_devnode devnode;
char model[32];
char serial[40];
char bus_info[32];
u32 hw_revision;
u32 driver_version;
u32 entity_id;
struct list_head entities;
/* Protects the entities list */
spinlock_t lock;
/* Serializes graph operations. */
struct mutex graph_mutex;
int (*link_notify)(struct media_link *link, u32 flags,
unsigned int notification);
/* Supported link_notify @notification values. */
/* media_devnode to media_device */
#define to_media_device(node) container_of(node, struct media_device, devnode)
int __must_check __media_device_register(struct media_device *mdev,
struct module *owner);
#define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE)
void media_device_unregister(struct media_device *mdev);
int __must_check media_device_register_entity(struct media_device *mdev,
struct media_entity *entity);
void media_device_unregister_entity(struct media_entity *entity);
/* Iterate over all entities. */
#define media_device_for_each_entity(entity, mdev) \
list_for_each_entry(entity, &(mdev)->entities, list)