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Laurent Pinchart176fb0d2009-12-09 08:39:58 -03001/*
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
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030026#include <linux/list.h>
Laurent Pinchart503c3d822010-03-07 15:04:59 -030027#include <linux/mutex.h>
Laurent Pinchart53e269c2009-12-09 08:40:00 -030028#include <linux/spinlock.h>
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030029
30#include <media/media-devnode.h>
Laurent Pinchart53e269c2009-12-09 08:40:00 -030031#include <media/media-entity.h>
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030032
Paul Gortmaker313162d2012-01-30 11:46:54 -050033struct device;
34
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030035/**
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
Laurent Pinchart53e269c2009-12-09 08:40:00 -030044 * @entity_id: ID of the next entity to be registered
45 * @entities: List of registered entities
46 * @lock: Entities list lock
Laurent Pinchart503c3d822010-03-07 15:04:59 -030047 * @graph_mutex: Entities graph operation lock
Sylwester Nawrocki813f5c02013-05-31 10:37:26 -030048 * @link_notify: Link state change notification callback
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030049 *
50 * This structure represents an abstract high-level media device. It allows easy
51 * access to entities and provides basic media device-level support. The
52 * structure can be allocated directly or embedded in a larger structure.
53 *
54 * The parent @dev is a physical device. It must be set before registering the
55 * media device.
56 *
57 * @model is a descriptive model name exported through sysfs. It doesn't have to
58 * be unique.
59 */
60struct media_device {
61 /* dev->driver_data points to this struct. */
62 struct device *dev;
63 struct media_devnode devnode;
64
65 char model[32];
66 char serial[40];
67 char bus_info[32];
68 u32 hw_revision;
69 u32 driver_version;
Laurent Pinchart53e269c2009-12-09 08:40:00 -030070
71 u32 entity_id;
72 struct list_head entities;
73
74 /* Protects the entities list */
75 spinlock_t lock;
Laurent Pinchart503c3d822010-03-07 15:04:59 -030076 /* Serializes graph operations. */
77 struct mutex graph_mutex;
Laurent Pinchart97548ed2009-12-09 08:40:03 -030078
Sylwester Nawrocki813f5c02013-05-31 10:37:26 -030079 int (*link_notify)(struct media_link *link, u32 flags,
80 unsigned int notification);
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030081};
82
Sylwester Nawrocki813f5c02013-05-31 10:37:26 -030083/* Supported link_notify @notification values. */
84#define MEDIA_DEV_NOTIFY_PRE_LINK_CH 0
85#define MEDIA_DEV_NOTIFY_POST_LINK_CH 1
86
Laurent Pinchart176fb0d2009-12-09 08:39:58 -030087/* media_devnode to media_device */
88#define to_media_device(node) container_of(node, struct media_device, devnode)
89
90int __must_check media_device_register(struct media_device *mdev);
91void media_device_unregister(struct media_device *mdev);
92
Laurent Pinchart53e269c2009-12-09 08:40:00 -030093int __must_check media_device_register_entity(struct media_device *mdev,
94 struct media_entity *entity);
95void media_device_unregister_entity(struct media_entity *entity);
96
97/* Iterate over all entities. */
98#define media_device_for_each_entity(entity, mdev) \
99 list_for_each_entry(entity, &(mdev)->entities, list)
100
Laurent Pinchart176fb0d2009-12-09 08:39:58 -0300101#endif