2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2021 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
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.
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.
31 #ifndef _LINUXKPI_LINUX_CDEV_H_
32 #define _LINUXKPI_LINUX_CDEV_H_
34 #include <linux/kobject.h>
35 #include <linux/sysfs.h>
36 #include <linux/kdev_t.h>
37 #include <linux/list.h>
39 #include <asm/atomic-long.h>
42 struct file_operations;
46 extern struct cdevsw linuxcdevsw;
47 extern const struct kobj_type linux_cdev_ktype;
48 extern const struct kobj_type linux_cdev_static_ktype;
55 const struct file_operations *ops;
60 struct linux_cdev *cdev_alloc(void);
63 cdev_init(struct linux_cdev *cdev, const struct file_operations *ops)
66 kobject_init(&cdev->kobj, &linux_cdev_static_ktype);
72 cdev_put(struct linux_cdev *p)
74 kobject_put(&p->kobj);
78 cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count)
80 struct make_dev_args args;
88 /* Setup arguments for make_dev_s() */
89 make_dev_args_init(&args);
90 args.mda_devsw = &linuxcdevsw;
94 args.mda_si_drv1 = cdev;
96 error = make_dev_s(&args, &cdev->cdev, "%s",
97 kobject_name(&cdev->kobj));
101 kobject_get(cdev->kobj.parent);
106 cdev_add_ext(struct linux_cdev *cdev, dev_t dev, uid_t uid, gid_t gid, int mode)
108 struct make_dev_args args;
113 /* Setup arguments for make_dev_s() */
114 make_dev_args_init(&args);
115 args.mda_devsw = &linuxcdevsw;
118 args.mda_mode = mode;
119 args.mda_si_drv1 = cdev;
121 error = make_dev_s(&args, &cdev->cdev, "%s/%d",
122 kobject_name(&cdev->kobj), MINOR(dev));
126 kobject_get(cdev->kobj.parent);
131 cdev_del(struct linux_cdev *cdev)
133 kobject_put(&cdev->kobj);
136 struct linux_cdev *linux_find_cdev(const char *name, unsigned major, unsigned minor);
138 int linux_cdev_device_add(struct linux_cdev *, struct device *);
139 void linux_cdev_device_del(struct linux_cdev *, struct device *);
141 #define cdev_device_add(...) \
142 linux_cdev_device_add(__VA_ARGS__)
143 #define cdev_device_del(...) \
144 linux_cdev_device_del(__VA_ARGS__)
146 #define cdev linux_cdev
148 #endif /* _LINUXKPI_LINUX_CDEV_H_ */