cdev.h revision 342804 
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 342804 2019-01-06 00:59:55Z kib $
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	u_int		refs;
56	u_int		siref;
57};
58
59static inline void
60cdev_init(struct linux_cdev *cdev, const struct file_operations *ops)
61{
62
63	kobject_init(&cdev->kobj, &linux_cdev_static_ktype);
64	cdev->ops = ops;
65	cdev->refs = 1;
66}
67
68static inline struct linux_cdev *
69cdev_alloc(void)
70{
71	struct linux_cdev *cdev;
72
73	cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK);
74	kobject_init(&cdev->kobj, &linux_cdev_ktype);
75	cdev->refs = 1;
76	return (cdev);
77}
78
79static inline void
80cdev_put(struct linux_cdev *p)
81{
82	kobject_put(&p->kobj);
83}
84
85static inline int
86cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count)
87{
88	struct make_dev_args args;
89	int error;
90
91	if (count != 1)
92		return (-EINVAL);
93
94	cdev->dev = dev;
95
96	/* Setup arguments for make_dev_s() */
97	make_dev_args_init(&args);
98	args.mda_devsw = &linuxcdevsw;
99	args.mda_uid = 0;
100	args.mda_gid = 0;
101	args.mda_mode = 0700;
102	args.mda_si_drv1 = cdev;
103
104	error = make_dev_s(&args, &cdev->cdev, "%s",
105	    kobject_name(&cdev->kobj));
106	if (error)
107		return (-error);
108
109	kobject_get(cdev->kobj.parent);
110	return (0);
111}
112
113static inline int
114cdev_add_ext(struct linux_cdev *cdev, dev_t dev, uid_t uid, gid_t gid, int mode)
115{
116	struct make_dev_args args;
117	int error;
118
119	cdev->dev = dev;
120
121	/* Setup arguments for make_dev_s() */
122	make_dev_args_init(&args);
123	args.mda_devsw = &linuxcdevsw;
124	args.mda_uid = uid;
125	args.mda_gid = gid;
126	args.mda_mode = mode;
127	args.mda_si_drv1 = cdev;
128
129	error = make_dev_s(&args, &cdev->cdev, "%s/%d",
130	    kobject_name(&cdev->kobj), MINOR(dev));
131	if (error)
132		return (-error);
133
134	kobject_get(cdev->kobj.parent);
135	return (0);
136}
137
138void linux_destroy_dev(struct linux_cdev *);
139
140static inline void
141cdev_del(struct linux_cdev *cdev)
142{
143
144	linux_destroy_dev(cdev);
145	kobject_put(&cdev->kobj);
146}
147
148struct linux_cdev *linux_find_cdev(const char *name, unsigned major, unsigned minor);
149
150#define	cdev	linux_cdev
151
152#endif	/* _LINUX_CDEV_H_ */
153