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1/*
2 * Media device node
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 *
24 * Common functions for media-related drivers to register and unregister media
25 * device nodes.
26 */
27
28#ifndef _MEDIA_DEVNODE_H
29#define _MEDIA_DEVNODE_H
30
31#include <linux/poll.h>
32#include <linux/fs.h>
33#include <linux/device.h>
34#include <linux/cdev.h>
35
36/*
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.
40 */
41#define MEDIA_FLAG_REGISTERED 0
42
43struct media_file_operations {
44 struct module *owner;
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 *);
51};
52
53/**
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
58 *
59 * This structure represents a media-related device node.
60 *
61 * The @parent is a physical device. It must be set by core or device drivers
62 * before registering the node.
63 */
64struct media_devnode {
65 /* device ops */
66 const struct media_file_operations *fops;
67
68 /* sysfs */
69 struct device dev; /* media device */
70 struct cdev cdev; /* character device */
71 struct device *parent; /* device parent */
72
73 /* device info */
74 int minor;
75 unsigned long flags; /* Use bitops to access flags */
76
77 /* callbacks */
78 void (*release)(struct media_devnode *mdev);
79};
80
81/* dev to media_devnode */
82#define to_media_devnode(cd) container_of(cd, struct media_devnode, dev)
83
84int __must_check media_devnode_register(struct media_devnode *mdev);
85void media_devnode_unregister(struct media_devnode *mdev);
86
87static inline struct media_devnode *media_devnode_data(struct file *filp)
88{
89 return filp->private_data;
90}
91
92static inline int media_devnode_is_registered(struct media_devnode *mdev)
93{
94 return test_bit(MEDIA_FLAG_REGISTERED, &mdev->flags);
95}
96
97#endif /* _MEDIA_DEVNODE_H */
1/*
2 * Media device node
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 *
24 * Common functions for media-related drivers to register and unregister media
25 * device nodes.
26 */
27
28#ifndef _MEDIA_DEVNODE_H
29#define _MEDIA_DEVNODE_H
30
31#include <linux/poll.h>
32#include <linux/fs.h>
33#include <linux/device.h>
34#include <linux/cdev.h>
35
36/*
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.
40 */
41#define MEDIA_FLAG_REGISTERED 0
42
43struct media_file_operations {
44 struct module *owner;
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 long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
50 int (*open) (struct file *);
51 int (*release) (struct file *);
52};
53
54/**
55 * struct media_devnode - Media device node
56 * @parent: parent device
57 * @minor: device node minor number
58 * @flags: flags, combination of the MEDIA_FLAG_* constants
59 *
60 * This structure represents a media-related device node.
61 *
62 * The @parent is a physical device. It must be set by core or device drivers
63 * before registering the node.
64 */
65struct media_devnode {
66 /* device ops */
67 const struct media_file_operations *fops;
68
69 /* sysfs */
70 struct device dev; /* media device */
71 struct cdev cdev; /* character device */
72 struct device *parent; /* device parent */
73
74 /* device info */
75 int minor;
76 unsigned long flags; /* Use bitops to access flags */
77
78 /* callbacks */
79 void (*release)(struct media_devnode *mdev);
80};
81
82/* dev to media_devnode */
83#define to_media_devnode(cd) container_of(cd, struct media_devnode, dev)
84
85int __must_check media_devnode_register(struct media_devnode *mdev);
86void media_devnode_unregister(struct media_devnode *mdev);
87
88static inline struct media_devnode *media_devnode_data(struct file *filp)
89{
90 return filp->private_data;
91}
92
93static inline int media_devnode_is_registered(struct media_devnode *mdev)
94{
95 return test_bit(MEDIA_FLAG_REGISTERED, &mdev->flags);
96}
97
98#endif /* _MEDIA_DEVNODE_H */