miscdevice.h revision 225736
1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#ifndef _LINUX_MISCDEVICE_H_ 30#define _LINUX_MISCDEVICE_H_ 31 32#define MISC_DYNAMIC_MINOR -1 33 34#include <linux/device.h> 35#include <linux/cdev.h> 36 37struct miscdevice { 38 const char *name; 39 struct device *this_device; 40 const struct file_operations *fops; 41 struct cdev *cdev; 42 int minor; 43}; 44 45extern struct class miscclass; 46 47static inline int 48misc_register(struct miscdevice *misc) 49{ 50 misc->this_device = device_create(&miscclass, &linux_rootdev, 0, misc, 51 misc->name); 52 misc->cdev = cdev_alloc(); 53 if (misc->cdev == NULL) 54 return -ENOMEM; 55 misc->cdev->owner = THIS_MODULE; 56 misc->cdev->ops = misc->fops; 57 kobject_set_name(&misc->cdev->kobj, misc->name); 58 if (cdev_add(misc->cdev, misc->this_device->devt, 1)) 59 return -EINVAL; 60 return (0); 61} 62 63static inline int 64misc_deregister(struct miscdevice *misc) 65{ 66 device_destroy(&miscclass, misc->this_device->devt); 67 cdev_del(misc->cdev); 68 69 return (0); 70} 71 72#endif /* _LINUX_MISCDEVICE_H_ */ 73