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 
33 struct 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  */
59 struct 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 
85 int __must_check media_device_register(struct media_device *mdev);
86 void media_device_unregister(struct media_device *mdev);
87 
88 int __must_check media_device_register_entity(struct media_device *mdev,
89 					      struct media_entity *entity);
90 void 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