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 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 * 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 80 cdev_put(struct linux_cdev *p) 81 { 82 kobject_put(&p->kobj); 83 } 84 85 static inline int 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 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 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