| /* |
| * Media device node |
| * |
| * Copyright (C) 2010 Nokia Corporation |
| * |
| * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> |
| * Sakari Ailus <sakari.ailus@maxwell.research.nokia.com> |
| * |
| * 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); |
| 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 */ |