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 * $FreeBSD$
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 struct file_operations;
40 struct inode;
41 struct module;
42
43 extern struct cdevsw linuxcdevsw;
44 extern const struct kobj_type linux_cdev_ktype;
45 extern const struct kobj_type linux_cdev_static_ktype;
46
47 struct 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
55 static inline void
cdev_init(struct linux_cdev * cdev,const struct file_operations * ops)56 cdev_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
63 static inline struct linux_cdev *
cdev_alloc(void)64 cdev_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
74 static inline void
cdev_put(struct linux_cdev * p)75 cdev_put(struct linux_cdev *p)
76 {
77 kobject_put(&p->kobj);
78 }
79
80 static inline int
cdev_add(struct linux_cdev * cdev,dev_t dev,unsigned count)81 cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count)
82 {
83 if (count != 1)
84 panic("cdev_add: Unsupported count: %d", count);
85 cdev->cdev = make_dev(&linuxcdevsw, MINOR(dev), 0, 0, 0700,
86 "%s", kobject_name(&cdev->kobj));
87 cdev->dev = dev;
88 cdev->cdev->si_drv1 = cdev;
89
90 kobject_get(cdev->kobj.parent);
91 return (0);
92 }
93
94 static inline void
cdev_del(struct linux_cdev * cdev)95 cdev_del(struct linux_cdev *cdev)
96 {
97 if (cdev->cdev) {
98 destroy_dev(cdev->cdev);
99 cdev->cdev = NULL;
100 }
101 kobject_put(&cdev->kobj);
102 }
103
104 #define cdev linux_cdev
105
106 #endif /* _LINUX_CDEV_H_ */
107