miscdevice.h revision 271127 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#ifndef	_LINUX_MISCDEVICE_H_
31#define	_LINUX_MISCDEVICE_H_
32
33#define	MISC_DYNAMIC_MINOR	-1
34
35#include <linux/device.h>
36#include <linux/cdev.h>
37
38struct miscdevice  {
39	const char	*name;
40	struct device	*this_device;
41	const struct file_operations *fops;
42	struct cdev	*cdev;
43	int		minor;
44	const char *nodename;
45	umode_t mode;
46};
47
48extern struct class	miscclass;
49
50static inline int
51misc_register(struct miscdevice *misc)
52{
53	misc->this_device = device_create(&miscclass, &linux_rootdev, 0, misc,
54	    misc->name);
55	misc->cdev = cdev_alloc();
56	if (misc->cdev == NULL)
57		return -ENOMEM;
58	misc->cdev->owner = THIS_MODULE;
59	misc->cdev->ops = misc->fops;
60	kobject_set_name(&misc->cdev->kobj, misc->name);
61        if (cdev_add(misc->cdev, misc->this_device->devt, 1))
62		return -EINVAL;
63	return (0);
64}
65
66static inline int
67misc_deregister(struct miscdevice *misc)
68{
69	device_destroy(&miscclass, misc->this_device->devt);
70	cdev_del(misc->cdev);
71
72	return (0);
73}
74
75#endif	/* _LINUX_MISCDEVICE_H_ */
76