linux/include/media/media-device.h
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   1/*
   2 * Media device
   3 *
   4 * Copyright (C) 2010 Nokia Corporation
   5 *
   6 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   7 *           Sakari Ailus <sakari.ailus@iki.fi>
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of the GNU General Public License version 2 as
  11 * published by the Free Software Foundation.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21 */
  22
  23#ifndef _MEDIA_DEVICE_H
  24#define _MEDIA_DEVICE_H
  25
  26#include <linux/list.h>
  27#include <linux/mutex.h>
  28#include <linux/spinlock.h>
  29
  30#include <media/media-devnode.h>
  31#include <media/media-entity.h>
  32
  33struct device;
  34
  35/**
  36 * struct media_device - Media device
  37 * @dev:        Parent device
  38 * @devnode:    Media device node
  39 * @model:      Device model name
  40 * @serial:     Device serial number (optional)
  41 * @bus_info:   Unique and stable device location identifier
  42 * @hw_revision: Hardware device revision
  43 * @driver_version: Device driver version
  44 * @entity_id:  ID of the next entity to be registered
  45 * @entities:   List of registered entities
  46 * @lock:       Entities list lock
  47 * @graph_mutex: Entities graph operation lock
  48 *
  49 * This structure represents an abstract high-level media device. It allows easy
  50 * access to entities and provides basic media device-level support. The
  51 * structure can be allocated directly or embedded in a larger structure.
  52 *
  53 * The parent @dev is a physical device. It must be set before registering the
  54 * media device.
  55 *
  56 * @model is a descriptive model name exported through sysfs. It doesn't have to
  57 * be unique.
  58 */
  59struct media_device {
  60        /* dev->driver_data points to this struct. */
  61        struct device *dev;
  62        struct media_devnode devnode;
  63
  64        char model[32];
  65        char serial[40];
  66        char bus_info[32];
  67        u32 hw_revision;
  68        u32 driver_version;
  69
  70        u32 entity_id;
  71        struct list_head entities;
  72
  73        /* Protects the entities list */
  74        spinlock_t lock;
  75        /* Serializes graph operations. */
  76        struct mutex graph_mutex;
  77
  78        int (*link_notify)(struct media_pad *source,
  79                           struct media_pad *sink, u32 flags);
  80};
  81
  82/* media_devnode to media_device */
  83#define to_media_device(node) container_of(node, struct media_device, devnode)
  84
  85int __must_check media_device_register(struct media_device *mdev);
  86void media_device_unregister(struct media_device *mdev);
  87
  88int __must_check media_device_register_entity(struct media_device *mdev,
  89                                              struct media_entity *entity);
  90void media_device_unregister_entity(struct media_entity *entity);
  91
  92/* Iterate over all entities. */
  93#define media_device_for_each_entity(entity, mdev)                      \
  94        list_for_each_entry(entity, &(mdev)->entities, list)
  95
  96#endif
  97
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