1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2021 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 _LINUXKPI_LINUX_CDEV_H_ 32 #define _LINUXKPI_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 device; 42 struct file_operations; 43 struct inode; 44 struct module; 45 46 extern struct cdevsw linuxcdevsw; 47 extern const struct kobj_type linux_cdev_ktype; 48 extern const struct kobj_type linux_cdev_static_ktype; 49 50 struct linux_cdev { 51 struct kobject kobj; 52 struct module *owner; 53 struct cdev *cdev; 54 dev_t dev; 55 const struct file_operations *ops; 56 u_int refs; 57 u_int siref; 58 }; 59 60 struct linux_cdev *cdev_alloc(void); 61 62 static inline void 63 cdev_init(struct linux_cdev *cdev, const struct file_operations *ops) 64 { 65 66 kobject_init(&cdev->kobj, &linux_cdev_static_ktype); 67 cdev->ops = ops; 68 cdev->refs = 1; 69 } 70 71 static inline void 72 cdev_put(struct linux_cdev *p) 73 { 74 kobject_put(&p->kobj); 75 } 76 77 static inline int 78 cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count) 79 { 80 struct make_dev_args args; 81 int error; 82 83 if (count != 1) 84 return (-EINVAL); 85 86 cdev->dev = dev; 87 88 /* Setup arguments for make_dev_s() */ 89 make_dev_args_init(&args); 90 args.mda_devsw = &linuxcdevsw; 91 args.mda_uid = 0; 92 args.mda_gid = 0; 93 args.mda_mode = 0700; 94 args.mda_si_drv1 = cdev; 95 96 error = make_dev_s(&args, &cdev->cdev, "%s", 97 kobject_name(&cdev->kobj)); 98 if (error) 99 return (-error); 100 101 kobject_get(cdev->kobj.parent); 102 return (0); 103 } 104 105 static inline int 106 cdev_add_ext(struct linux_cdev *cdev, dev_t dev, uid_t uid, gid_t gid, int mode) 107 { 108 struct make_dev_args args; 109 int error; 110 111 cdev->dev = dev; 112 113 /* Setup arguments for make_dev_s() */ 114 make_dev_args_init(&args); 115 args.mda_devsw = &linuxcdevsw; 116 args.mda_uid = uid; 117 args.mda_gid = gid; 118 args.mda_mode = mode; 119 args.mda_si_drv1 = cdev; 120 121 error = make_dev_s(&args, &cdev->cdev, "%s/%d", 122 kobject_name(&cdev->kobj), MINOR(dev)); 123 if (error) 124 return (-error); 125 126 kobject_get(cdev->kobj.parent); 127 return (0); 128 } 129 130 static inline void 131 cdev_del(struct linux_cdev *cdev) 132 { 133 kobject_put(&cdev->kobj); 134 } 135 136 struct linux_cdev *linux_find_cdev(const char *name, unsigned major, unsigned minor); 137 138 int linux_cdev_device_add(struct linux_cdev *, struct device *); 139 void linux_cdev_device_del(struct linux_cdev *, struct device *); 140 141 #define cdev_device_add(...) \ 142 linux_cdev_device_add(__VA_ARGS__) 143 #define cdev_device_del(...) \ 144 linux_cdev_device_del(__VA_ARGS__) 145 146 #define cdev linux_cdev 147 148 #endif /* _LINUXKPI_LINUX_CDEV_H_ */ 149