You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
3.2 KiB
103 lines
3.2 KiB
/* |
|
* Media device node |
|
* |
|
* Copyright (C) 2010 Nokia Corporation |
|
* |
|
* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> |
|
* Sakari Ailus <sakari.ailus@iki.fi> |
|
* |
|
* This program is free software; you can redistribute it and/or modify |
|
* it under the terms of the GNU General Public License version 2 as |
|
* published by the Free Software Foundation. |
|
* |
|
* This program is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|
* GNU General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU General Public License |
|
* along with this program; if not, write to the Free Software |
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
|
* |
|
* -- |
|
* |
|
* Common functions for media-related drivers to register and unregister media |
|
* device nodes. |
|
*/ |
|
|
|
#ifndef _MEDIA_DEVNODE_H |
|
#define _MEDIA_DEVNODE_H |
|
|
|
#include <linux/poll.h> |
|
#include <linux/fs.h> |
|
#include <linux/device.h> |
|
#include <linux/cdev.h> |
|
|
|
/* |
|
* Flag to mark the media_devnode struct as registered. Drivers must not touch |
|
* this flag directly, it will be set and cleared by media_devnode_register and |
|
* media_devnode_unregister. |
|
*/ |
|
#define MEDIA_FLAG_REGISTERED 0 |
|
|
|
struct media_file_operations { |
|
struct module *owner; |
|
ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); |
|
ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); |
|
unsigned int (*poll) (struct file *, struct poll_table_struct *); |
|
long (*ioctl) (struct file *, unsigned int, unsigned long); |
|
long (*compat_ioctl) (struct file *, unsigned int, unsigned long); |
|
int (*open) (struct file *); |
|
int (*release) (struct file *); |
|
}; |
|
|
|
/** |
|
* struct media_devnode - Media device node |
|
* @fops: pointer to struct media_file_operations with media device ops |
|
* @dev: struct device pointer for the media controller device |
|
* @cdev: struct cdev pointer character device |
|
* @parent: parent device |
|
* @minor: device node minor number |
|
* @flags: flags, combination of the MEDIA_FLAG_* constants |
|
* @release: release callback called at the end of media_devnode_release() |
|
* |
|
* This structure represents a media-related device node. |
|
* |
|
* The @parent is a physical device. It must be set by core or device drivers |
|
* before registering the node. |
|
*/ |
|
struct media_devnode { |
|
/* device ops */ |
|
const struct media_file_operations *fops; |
|
|
|
/* sysfs */ |
|
struct device dev; /* media device */ |
|
struct cdev cdev; /* character device */ |
|
struct device *parent; /* device parent */ |
|
|
|
/* device info */ |
|
int minor; |
|
unsigned long flags; /* Use bitops to access flags */ |
|
|
|
/* callbacks */ |
|
void (*release)(struct media_devnode *mdev); |
|
}; |
|
|
|
/* dev to media_devnode */ |
|
#define to_media_devnode(cd) container_of(cd, struct media_devnode, dev) |
|
|
|
int __must_check media_devnode_register(struct media_devnode *mdev, |
|
struct module *owner); |
|
void media_devnode_unregister(struct media_devnode *mdev); |
|
|
|
static inline struct media_devnode *media_devnode_data(struct file *filp) |
|
{ |
|
return filp->private_data; |
|
} |
|
|
|
static inline int media_devnode_is_registered(struct media_devnode *mdev) |
|
{ |
|
return test_bit(MEDIA_FLAG_REGISTERED, &mdev->flags); |
|
} |
|
|
|
#endif /* _MEDIA_DEVNODE_H */
|
|
|