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/*
* 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>
struct media_device;
/*
* 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 {
struct media_device *media_dev;
/* 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 *devnode);
};
/* dev to media_devnode */
#define to_media_devnode(cd) container_of(cd, struct media_devnode, dev)
int __must_check media_devnode_register(struct media_device *mdev,
struct media_devnode *devnode,
struct module *owner);
/**
* media_devnode_unregister_prepare - clear the media device node register bit
* @devnode: the device node to prepare for unregister
*
* This clears the passed device register bit. Future open calls will be met
* with errors. Should be called before media_devnode_unregister() to avoid
* races with unregister and device file open calls.
*
* This function can safely be called if the device node has never been
* registered or has already been unregistered.
*/
void media_devnode_unregister_prepare(struct media_devnode *devnode);
void media_devnode_unregister(struct media_devnode *devnode);
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 *devnode)
{
if (!devnode)
return false;
return test_bit(MEDIA_FLAG_REGISTERED, &devnode->flags);
}
#endif /* _MEDIA_DEVNODE_H */