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Filename/usr/src/linux-headers-3.13.0-24/include/media/media-device.h
Size3.11 kb
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Create time27-Apr-2025 09:50
Last modified20-Jan-2014 10:40
Last accessed05-Jul-2025 23:05
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/*
* Media device
*
* Copyright (C) 2010 Nokia Corporation
*
* Contacts: Laurent Pinchart <[email protected]>
* Sakari Ailus <[email protected]>
*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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
*/

#ifndef _MEDIA_DEVICE_H
#define _MEDIA_DEVICE_H

#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. */
#define MEDIA_DEV_NOTIFY_PRE_LINK_CH 0
#define MEDIA_DEV_NOTIFY_POST_LINK_CH 1

/* 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);
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)

#endif