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
30 #ifndef _LINUX_CDEV_H_
31 #define _LINUX_CDEV_H_
32
33 #include <linux/kobject.h>
34 #include <linux/kdev_t.h>
35 #include <linux/list.h>
36
37 struct file_operations;
38 struct inode;
39 struct module;
40
41 extern struct cdevsw linuxcdevsw;
42
43 struct linux_cdev {
44 struct kobject kobj;
45 struct module *owner;
46 struct cdev *cdev;
47 dev_t dev;
48 const struct file_operations *ops;
49 };
50
51 static inline void
cdev_release(struct kobject * kobj)52 cdev_release(struct kobject *kobj)
53 {
54 struct linux_cdev *cdev;
55
56 cdev = container_of(kobj, struct linux_cdev, kobj);
57 if (cdev->cdev)
58 destroy_dev(cdev->cdev);
59 kfree(cdev);
60 }
61
62 static inline void
cdev_static_release(struct kobject * kobj)63 cdev_static_release(struct kobject *kobj)
64 {
65 struct linux_cdev *cdev;
66
67 cdev = container_of(kobj, struct linux_cdev, kobj);
68 if (cdev->cdev)
69 destroy_dev(cdev->cdev);
70 }
71
72 static struct kobj_type cdev_ktype = {
73 .release = cdev_release,
74 };
75
76 static struct kobj_type cdev_static_ktype = {
77 .release = cdev_static_release,
78 };
79
80 static inline void
cdev_init(struct linux_cdev * cdev,const struct file_operations * ops)81 cdev_init(struct linux_cdev *cdev, const struct file_operations *ops)
82 {
83
84 kobject_init(&cdev->kobj, &cdev_static_ktype);
85 cdev->ops = ops;
86 }
87
88 static inline struct linux_cdev *
cdev_alloc(void)89 cdev_alloc(void)
90 {
91 struct linux_cdev *cdev;
92
93 cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK);
94 if (cdev)
95 kobject_init(&cdev->kobj, &cdev_ktype);
96 return (cdev);
97 }
98
99 static inline void
cdev_put(struct linux_cdev * p)100 cdev_put(struct linux_cdev *p)
101 {
102 kobject_put(&p->kobj);
103 }
104
105 static inline int
cdev_add(struct linux_cdev * cdev,dev_t dev,unsigned count)106 cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count)
107 {
108 if (count != 1)
109 panic("cdev_add: Unsupported count: %d", count);
110 cdev->cdev = make_dev(&linuxcdevsw, MINOR(dev), 0, 0, 0700,
111 "%s", kobject_name(&cdev->kobj));
112 cdev->dev = dev;
113 cdev->cdev->si_drv1 = cdev;
114
115 return (0);
116 }
117
118 static inline void
cdev_del(struct linux_cdev * cdev)119 cdev_del(struct linux_cdev *cdev)
120 {
121 if (cdev->cdev) {
122 destroy_dev(cdev->cdev);
123 cdev->cdev = NULL;
124 }
125 kobject_put(&cdev->kobj);
126 }
127
128 #define cdev linux_cdev
129
130 #endif /* _LINUX_CDEV_H_ */
131