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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 | ||
43 | struct 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); | |
c6c1d50b | 49 | long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
cf4b9211 LP |
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 | */ | |
65 | struct 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 | ||
85 | int __must_check media_devnode_register(struct media_devnode *mdev); | |
86 | void media_devnode_unregister(struct media_devnode *mdev); | |
87 | ||
88 | static inline struct media_devnode *media_devnode_data(struct file *filp) | |
89 | { | |
90 | return filp->private_data; | |
91 | } | |
92 | ||
93 | static 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 */ |