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 #ifndef _LINUXKPI_LINUX_MISCDEVICE_H_
30 #define _LINUXKPI_LINUX_MISCDEVICE_H_
31
32 #define MISC_DYNAMIC_MINOR -1
33
34 #include <linux/device.h>
35 #include <linux/cdev.h>
36
37 struct miscdevice {
38 const char *name;
39 struct device *this_device;
40 const struct file_operations *fops;
41 struct cdev *cdev;
42 int minor;
43 const char *nodename;
44 umode_t mode;
45 };
46
47 extern struct class linux_class_misc;
48
49 static inline int
misc_register(struct miscdevice * misc)50 misc_register(struct miscdevice *misc)
51 {
52 misc->this_device = device_create(&linux_class_misc,
53 &linux_root_device, 0, misc, misc->name);
54 misc->cdev = cdev_alloc();
55 if (misc->cdev == NULL)
56 return -ENOMEM;
57 misc->cdev->owner = THIS_MODULE;
58 misc->cdev->ops = misc->fops;
59 kobject_set_name(&misc->cdev->kobj, misc->name);
60 if (cdev_add(misc->cdev, misc->this_device->devt, 1))
61 return -EINVAL;
62 return (0);
63 }
64
65 static inline int
misc_deregister(struct miscdevice * misc)66 misc_deregister(struct miscdevice *misc)
67 {
68 device_destroy(&linux_class_misc, misc->this_device->devt);
69 cdev_del(misc->cdev);
70
71 return (0);
72 }
73
74 #endif /* _LINUXKPI_LINUX_MISCDEVICE_H_ */
75