/* * 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 * @parent:	parent device * @minor:	device node minor number * @flags:	flags, combination of the MEDIA_FLAG_* constants * * 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);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 */