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176fb0d1 LP |
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 | ||
176fb0d1 | 26 | #include <linux/list.h> |
503c3d82 | 27 | #include <linux/mutex.h> |
53e269c1 | 28 | #include <linux/spinlock.h> |
176fb0d1 LP |
29 | |
30 | #include <media/media-devnode.h> | |
53e269c1 | 31 | #include <media/media-entity.h> |
176fb0d1 | 32 | |
313162d0 PG |
33 | struct device; |
34 | ||
176fb0d1 LP |
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 | |
53e269c1 LP |
44 | * @entity_id: ID of the next entity to be registered |
45 | * @entities: List of registered entities | |
46 | * @lock: Entities list lock | |
503c3d82 | 47 | * @graph_mutex: Entities graph operation lock |
813f5c0a | 48 | * @link_notify: Link state change notification callback |
176fb0d1 LP |
49 | * |
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 | */ | |
60 | struct 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; | |
53e269c1 LP |
70 | |
71 | u32 entity_id; | |
72 | struct list_head entities; | |
73 | ||
74 | /* Protects the entities list */ | |
75 | spinlock_t lock; | |
503c3d82 LP |
76 | /* Serializes graph operations. */ |
77 | struct mutex graph_mutex; | |
97548ed4 | 78 | |
813f5c0a SN |
79 | int (*link_notify)(struct media_link *link, u32 flags, |
80 | unsigned int notification); | |
176fb0d1 LP |
81 | }; |
82 | ||
e576d60b SK |
83 | #ifdef CONFIG_MEDIA_CONTROLLER |
84 | ||
813f5c0a SN |
85 | /* Supported link_notify @notification values. */ |
86 | #define MEDIA_DEV_NOTIFY_PRE_LINK_CH 0 | |
87 | #define MEDIA_DEV_NOTIFY_POST_LINK_CH 1 | |
88 | ||
176fb0d1 LP |
89 | /* media_devnode to media_device */ |
90 | #define to_media_device(node) container_of(node, struct media_device, devnode) | |
91 | ||
85de721c SA |
92 | int __must_check __media_device_register(struct media_device *mdev, |
93 | struct module *owner); | |
94 | #define media_device_register(mdev) __media_device_register(mdev, THIS_MODULE) | |
176fb0d1 LP |
95 | void media_device_unregister(struct media_device *mdev); |
96 | ||
53e269c1 LP |
97 | int __must_check media_device_register_entity(struct media_device *mdev, |
98 | struct media_entity *entity); | |
99 | void media_device_unregister_entity(struct media_entity *entity); | |
d062f911 SK |
100 | struct media_device *media_device_get_devres(struct device *dev); |
101 | struct media_device *media_device_find_devres(struct device *dev); | |
53e269c1 LP |
102 | |
103 | /* Iterate over all entities. */ | |
104 | #define media_device_for_each_entity(entity, mdev) \ | |
105 | list_for_each_entry(entity, &(mdev)->entities, list) | |
106 | ||
e576d60b SK |
107 | #else |
108 | static inline int media_device_register(struct media_device *mdev) | |
109 | { | |
110 | return 0; | |
111 | } | |
112 | static inline void media_device_unregister(struct media_device *mdev) | |
113 | { | |
114 | } | |
115 | static inline int media_device_register_entity(struct media_device *mdev, | |
116 | struct media_entity *entity) | |
117 | { | |
118 | return 0; | |
119 | } | |
120 | static inline void media_device_unregister_entity(struct media_entity *entity) | |
121 | { | |
122 | } | |
123 | static inline struct media_device *media_device_get_devres(struct device *dev) | |
124 | { | |
125 | return NULL; | |
126 | } | |
127 | static inline struct media_device *media_device_find_devres(struct device *dev) | |
128 | { | |
129 | return NULL; | |
130 | } | |
131 | #endif /* CONFIG_MEDIA_CONTROLLER */ | |
176fb0d1 | 132 | #endif |