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 * $FreeBSD$
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
41 struct file_operations;
42 struct inode;
43 struct module;
44
45 extern struct cdevsw linuxcdevsw;
46 extern const struct kobj_type linux_cdev_ktype;
47 extern const struct kobj_type linux_cdev_static_ktype;
48
49 struct 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
59 static inline void
cdev_init(struct linux_cdev * cdev,const struct file_operations * ops)60 cdev_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
68 static inline struct linux_cdev *
cdev_alloc(void)69 cdev_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
79 static inline void
cdev_put(struct linux_cdev * p)80 cdev_put(struct linux_cdev *p)
81 {
82 kobject_put(&p->kobj);
83 }
84
85 static inline int
cdev_add(struct linux_cdev * cdev,dev_t dev,unsigned count)86 cdev_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
113 static inline int
cdev_add_ext(struct linux_cdev * cdev,dev_t dev,uid_t uid,gid_t gid,int mode)114 cdev_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
138 void linux_destroy_dev(struct linux_cdev *);
139
140 static inline void
cdev_del(struct linux_cdev * cdev)141 cdev_del(struct linux_cdev *cdev)
142 {
143
144 linux_destroy_dev(cdev);
145 kobject_put(&cdev->kobj);
146 }
147
148 struct 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