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_CDEV_H_
30#define	_LINUX_CDEV_H_
31
32#include <linux/kobject.h>
33#include <linux/kdev_t.h>
34#include <linux/list.h>
35
36struct file_operations;
37struct inode;
38struct module;
39
40extern struct cdevsw linuxcdevsw;
41
42struct linux_cdev {
43	struct kobject	kobj;
44	struct module	*owner;
45	struct cdev	*cdev;
46	dev_t		dev;
47	const struct file_operations *ops;
48};
49
50static inline void
51cdev_release(struct kobject *kobj)
52{
53	struct linux_cdev *cdev;
54
55	cdev = container_of(kobj, struct linux_cdev, kobj);
56	if (cdev->cdev)
57		destroy_dev(cdev->cdev);
58	kfree(cdev);
59}
60
61static inline void
62cdev_static_release(struct kobject *kobj)
63{
64	struct linux_cdev *cdev;
65
66	cdev = container_of(kobj, struct linux_cdev, kobj);
67	if (cdev->cdev)
68		destroy_dev(cdev->cdev);
69}
70
71static struct kobj_type cdev_ktype = {
72	.release = cdev_release,
73};
74
75static struct kobj_type cdev_static_ktype = {
76	.release = cdev_static_release,
77};
78
79static inline void
80cdev_init(struct linux_cdev *cdev, const struct file_operations *ops)
81{
82
83	kobject_init(&cdev->kobj, &cdev_static_ktype);
84	cdev->ops = ops;
85}
86
87static inline struct linux_cdev *
88cdev_alloc(void)
89{
90	struct linux_cdev *cdev;
91
92	cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK);
93	if (cdev)
94		kobject_init(&cdev->kobj, &cdev_ktype);
95	return (cdev);
96}
97
98static inline void
99cdev_put(struct linux_cdev *p)
100{
101	kobject_put(&p->kobj);
102}
103
104static inline int
105cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count)
106{
107	if (count != 1)
108		panic("cdev_add: Unsupported count: %d", count);
109	cdev->cdev = make_dev(&linuxcdevsw, MINOR(dev), 0, 0, 0700,
110	    "%s", kobject_name(&cdev->kobj));
111	cdev->dev = dev;
112	cdev->cdev->si_drv1 = cdev;
113
114	return (0);
115}
116
117static inline void
118cdev_del(struct linux_cdev *cdev)
119{
120	if (cdev->cdev) {
121		destroy_dev(cdev->cdev);
122		cdev->cdev = NULL;
123	}
124	kobject_put(&cdev->kobj);
125}
126
127#define	cdev	linux_cdev
128
129#endif	/* _LINUX_CDEV_H_ */
130