4 * Copyright (C) 2010 Nokia Corporation
6 * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
7 * Sakari Ailus <sakari.ailus@iki.fi>
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.
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.
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
24 * Common functions for media-related drivers to register and unregister media
28 #ifndef _MEDIA_DEVNODE_H
29 #define _MEDIA_DEVNODE_H
31 #include <linux/poll.h>
33 #include <linux/device.h>
34 #include <linux/cdev.h>
37 * Flag to mark the media_devnode struct as registered. Drivers must not touch
38 * this flag directly, it will be set and cleared by media_devnode_register and
39 * media_devnode_unregister.
41 #define MEDIA_FLAG_REGISTERED 0
43 struct media_file_operations
{
45 ssize_t (*read
) (struct file
*, char __user
*, size_t, loff_t
*);
46 ssize_t (*write
) (struct file
*, const char __user
*, size_t, loff_t
*);
47 unsigned int (*poll
) (struct file
*, struct poll_table_struct
*);
48 long (*ioctl
) (struct file
*, unsigned int, unsigned long);
49 int (*open
) (struct file
*);
50 int (*release
) (struct file
*);
54 * struct media_devnode - Media device node
55 * @parent: parent device
56 * @minor: device node minor number
57 * @flags: flags, combination of the MEDIA_FLAG_* constants
59 * This structure represents a media-related device node.
61 * The @parent is a physical device. It must be set by core or device drivers
62 * before registering the node.
64 struct media_devnode
{
66 const struct media_file_operations
*fops
;
69 struct device dev
; /* media device */
70 struct cdev cdev
; /* character device */
71 struct device
*parent
; /* device parent */
75 unsigned long flags
; /* Use bitops to access flags */
78 void (*release
)(struct media_devnode
*mdev
);
81 /* dev to media_devnode */
82 #define to_media_devnode(cd) container_of(cd, struct media_devnode, dev)
84 int __must_check
media_devnode_register(struct media_devnode
*mdev
);
85 void media_devnode_unregister(struct media_devnode
*mdev
);
87 static inline struct media_devnode
*media_devnode_data(struct file
*filp
)
89 return filp
->private_data
;
92 static inline int media_devnode_is_registered(struct media_devnode
*mdev
)
94 return test_bit(MEDIA_FLAG_REGISTERED
, &mdev
->flags
);
97 #endif /* _MEDIA_DEVNODE_H */
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