cdev.h revision 341850 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2016 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 * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/cdev.h 341850 2018-12-12 10:09:23Z hselasky $
30 */
31#ifndef	_LINUX_CDEV_H_
32#define	_LINUX_CDEV_H_
33
34#include <linux/kobject.h>
35#include <linux/sysfs.h>
36#include <linux/kdev_t.h>
37#include <linux/list.h>
38
39#include <asm/atomic-long.h>
40
41struct file_operations;
42struct inode;
43struct module;
44
45extern struct cdevsw linuxcdevsw;
46extern const struct kobj_type linux_cdev_ktype;
47extern const struct kobj_type linux_cdev_static_ktype;
48
49struct linux_cdev {
50	struct kobject	kobj;
51	struct module	*owner;
52	struct cdev	*cdev;
53	dev_t		dev;
54	const struct file_operations *ops;
55	atomic_long_t	refs;
56};
57
58static inline void
59cdev_init(struct linux_cdev *cdev, const struct file_operations *ops)
60{
61
62	kobject_init(&cdev->kobj, &linux_cdev_static_ktype);
63	cdev->ops = ops;
64	atomic_long_set(&cdev->refs, 0);
65}
66
67static inline struct linux_cdev *
68cdev_alloc(void)
69{
70	struct linux_cdev *cdev;
71
72	cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK);
73	if (cdev)
74		kobject_init(&cdev->kobj, &linux_cdev_ktype);
75	return (cdev);
76}
77
78static inline void
79cdev_put(struct linux_cdev *p)
80{
81	kobject_put(&p->kobj);
82}
83
84static inline int
85cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count)
86{
87	struct make_dev_args args;
88	int error;
89
90	if (count != 1)
91		return (-EINVAL);
92
93	cdev->dev = dev;
94
95	/* Setup arguments for make_dev_s() */
96	make_dev_args_init(&args);
97	args.mda_devsw = &linuxcdevsw;
98	args.mda_uid = 0;
99	args.mda_gid = 0;
100	args.mda_mode = 0700;
101	args.mda_si_drv1 = cdev;
102
103	error = make_dev_s(&args, &cdev->cdev, "%s",
104	    kobject_name(&cdev->kobj));
105	if (error)
106		return (-error);
107
108	kobject_get(cdev->kobj.parent);
109	return (0);
110}
111
112static inline int
113cdev_add_ext(struct linux_cdev *cdev, dev_t dev, uid_t uid, gid_t gid, int mode)
114{
115	struct make_dev_args args;
116	int error;
117
118	cdev->dev = dev;
119
120	/* Setup arguments for make_dev_s() */
121	make_dev_args_init(&args);
122	args.mda_devsw = &linuxcdevsw;
123	args.mda_uid = uid;
124	args.mda_gid = gid;
125	args.mda_mode = mode;
126	args.mda_si_drv1 = cdev;
127
128	error = make_dev_s(&args, &cdev->cdev, "%s/%d",
129	    kobject_name(&cdev->kobj), MINOR(dev));
130	if (error)
131		return (-error);
132
133	kobject_get(cdev->kobj.parent);
134	return (0);
135}
136
137void linux_destroy_dev(struct linux_cdev *);
138
139static inline void
140cdev_del(struct linux_cdev *cdev)
141{
142
143	linux_destroy_dev(cdev);
144	kobject_put(&cdev->kobj);
145}
146
147struct linux_cdev *linux_find_cdev(const char *name, unsigned major, unsigned minor);
148
149#define	cdev	linux_cdev
150
151#endif	/* _LINUX_CDEV_H_ */
152