xref: /freebsd/sys/compat/linuxkpi/common/include/linux/cdev.h (revision f0cfa1b168014f56c02b83e5f28412cc5f78d117)
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 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
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 *
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
75 cdev_put(struct linux_cdev *p)
76 {
77 	kobject_put(&p->kobj);
78 }
79 
80 static inline int
81 cdev_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 
99 	error = make_dev_s(&args, &cdev->cdev, "%s",
100 	    kobject_name(&cdev->kobj));
101 	if (error)
102 		return (-error);
103 
104 	kobject_get(cdev->kobj.parent);
105 	return (0);
106 }
107 
108 static inline int
109 cdev_add_ext(struct linux_cdev *cdev, dev_t dev, uid_t uid, gid_t gid, int mode)
110 {
111 	struct make_dev_args args;
112 	int error;
113 
114 	cdev->dev = dev;
115 
116 	/* Setup arguments for make_dev_s() */
117 	make_dev_args_init(&args);
118 	args.mda_devsw = &linuxcdevsw;
119 	args.mda_uid = uid;
120 	args.mda_gid = gid;
121 	args.mda_mode = mode;
122 	args.mda_si_drv1 = cdev;
123 
124 	error = make_dev_s(&args, &cdev->cdev, "%s/%d",
125 	    kobject_name(&cdev->kobj), MINOR(dev));
126 	if (error)
127 		return (-error);
128 
129 	kobject_get(cdev->kobj.parent);
130 	return (0);
131 }
132 
133 static inline void
134 cdev_del(struct linux_cdev *cdev)
135 {
136 	if (cdev->cdev) {
137 		destroy_dev(cdev->cdev);
138 		cdev->cdev = NULL;
139 	}
140 	kobject_put(&cdev->kobj);
141 }
142 
143 struct linux_cdev *linux_find_cdev(const char *name, unsigned major, unsigned minor);
144 
145 #define	cdev	linux_cdev
146 
147 #endif	/* _LINUX_CDEV_H_ */
148