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 args.mda_unit = dev; 99 100 error = make_dev_s(&args, &cdev->cdev, "%s", 101 kobject_name(&cdev->kobj)); 102 if (error) 103 return (-error); 104 105 kobject_get(cdev->kobj.parent); 106 return (0); 107 } 108 109 static inline int 110 cdev_add_ext(struct linux_cdev *cdev, dev_t dev, uid_t uid, gid_t gid, int mode) 111 { 112 struct make_dev_args args; 113 int error; 114 115 cdev->dev = dev; 116 117 /* Setup arguments for make_dev_s() */ 118 make_dev_args_init(&args); 119 args.mda_devsw = &linuxcdevsw; 120 args.mda_uid = uid; 121 args.mda_gid = gid; 122 args.mda_mode = mode; 123 args.mda_si_drv1 = cdev; 124 args.mda_unit = dev; 125 126 error = make_dev_s(&args, &cdev->cdev, "%s/%d", 127 kobject_name(&cdev->kobj), MINOR(dev)); 128 if (error) 129 return (-error); 130 131 kobject_get(cdev->kobj.parent); 132 return (0); 133 } 134 135 static inline void 136 cdev_del(struct linux_cdev *cdev) 137 { 138 if (cdev->cdev) { 139 destroy_dev(cdev->cdev); 140 cdev->cdev = NULL; 141 } 142 kobject_put(&cdev->kobj); 143 } 144 145 struct linux_cdev *linux_find_cdev(const char *name, unsigned major, unsigned minor); 146 147 #define cdev linux_cdev 148 149 #endif /* _LINUX_CDEV_H_ */ 150