projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| cf4b9211 LP |
1 | /* |
| 2 | * Media device node | |
| 3 | * | |
| 4 | * Copyright (C) 2010 Nokia Corporation | |
| 5 | * | |
| 6 | * Contacts: Laurent Pinchart <[email protected]> | |
| 7 | * Sakari Ailus <[email protected]> | |
| 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); | |
| 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 | */ | |
| 64 | struct 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 | ||
| 84 | int __must_check media_devnode_register(struct media_devnode *mdev); | |
| 85 | void media_devnode_unregister(struct media_devnode *mdev); | |
| 86 | ||
| 87 | static inline struct media_devnode *media_devnode_data(struct file *filp) | |
| 88 | { | |
| 89 | return filp->private_data; | |
| 90 | } | |
| 91 | ||
| 92 | static 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 */ |