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: releng/11.0/sys/compat/linuxkpi/common/include/linux/cdev.h 300575 2016-05-24 07:06:04Z 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
39struct file_operations;
40struct inode;
41struct module;
42
43extern struct cdevsw linuxcdevsw;
44extern const struct kobj_type linux_cdev_ktype;
45extern const struct kobj_type linux_cdev_static_ktype;
46
47struct linux_cdev {
48	struct kobject	kobj;
49	struct module	*owner;
50	struct cdev	*cdev;
51	dev_t		dev;
52	const struct file_operations *ops;
53};
54
55static inline void
56cdev_init(struct linux_cdev *cdev, const struct file_operations *ops)
57{
58
59	kobject_init(&cdev->kobj, &linux_cdev_static_ktype);
60	cdev->ops = ops;
61}
62
63static inline struct linux_cdev *
64cdev_alloc(void)
65{
66	struct linux_cdev *cdev;
67
68	cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK);
69	if (cdev)
70		kobject_init(&cdev->kobj, &linux_cdev_ktype);
71	return (cdev);
72}
73
74static inline void
75cdev_put(struct linux_cdev *p)
76{
77	kobject_put(&p->kobj);
78}
79
80static inline int
81cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count)
82{
83	struct make_dev_args args;
84	int error;
85
86	if (count != 1)
87		return (-EINVAL);
88
89	cdev->dev = dev;
90
91	/* Setup arguments for make_dev_s() */
92	make_dev_args_init(&args);
93	args.mda_devsw = &linuxcdevsw;
94	args.mda_uid = 0;
95	args.mda_gid = 0;
96	args.mda_mode = 0700;
97	args.mda_si_drv1 = cdev;
98	args.mda_unit = MINOR(dev);
99
100	error = make_dev_s(&args, &cdev->cdev, "%s",
101	    kobject_name(&cdev->kobj));
102	if (error)
103		return (-error);
104
105	kobject_get(cdev->kobj.parent);
106	return (0);
107}
108
109static inline int
110cdev_add_ext(struct linux_cdev *cdev, dev_t dev, uid_t uid, gid_t gid, int mode)
111{
112	struct make_dev_args args;
113	int error;
114
115	cdev->dev = dev;
116
117	/* Setup arguments for make_dev_s() */
118	make_dev_args_init(&args);
119	args.mda_devsw = &linuxcdevsw;
120	args.mda_uid = uid;
121	args.mda_gid = gid;
122	args.mda_mode = mode;
123	args.mda_si_drv1 = cdev;
124	args.mda_unit = MINOR(dev);
125
126	error = make_dev_s(&args, &cdev->cdev, "%s/%d",
127	    kobject_name(&cdev->kobj), MINOR(dev));
128	if (error)
129		return (-error);
130
131	kobject_get(cdev->kobj.parent);
132	return (0);
133}
134
135static inline void
136cdev_del(struct linux_cdev *cdev)
137{
138	if (cdev->cdev) {
139		destroy_dev(cdev->cdev);
140		cdev->cdev = NULL;
141	}
142	kobject_put(&cdev->kobj);
143}
144
145#define	cdev	linux_cdev
146
147#endif	/* _LINUX_CDEV_H_ */
148