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