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 atomic_long_t refs; 56 }; 57 58 static inline void 59 cdev_init(struct linux_cdev *cdev, const struct file_operations *ops) 60 { 61 62 kobject_init(&cdev->kobj, &linux_cdev_static_ktype); 63 cdev->ops = ops; 64 atomic_long_set(&cdev->refs, 0); 65 } 66 67 static inline struct linux_cdev * 68 cdev_alloc(void) 69 { 70 struct linux_cdev *cdev; 71 72 cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK); 73 if (cdev) 74 kobject_init(&cdev->kobj, &linux_cdev_ktype); 75 return (cdev); 76 } 77 78 static inline void 79 cdev_put(struct linux_cdev *p) 80 { 81 kobject_put(&p->kobj); 82 } 83 84 static inline int 85 cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count) 86 { 87 struct make_dev_args args; 88 int error; 89 90 if (count != 1) 91 return (-EINVAL); 92 93 cdev->dev = dev; 94 95 /* Setup arguments for make_dev_s() */ 96 make_dev_args_init(&args); 97 args.mda_devsw = &linuxcdevsw; 98 args.mda_uid = 0; 99 args.mda_gid = 0; 100 args.mda_mode = 0700; 101 args.mda_si_drv1 = cdev; 102 103 error = make_dev_s(&args, &cdev->cdev, "%s", 104 kobject_name(&cdev->kobj)); 105 if (error) 106 return (-error); 107 108 kobject_get(cdev->kobj.parent); 109 return (0); 110 } 111 112 static inline int 113 cdev_add_ext(struct linux_cdev *cdev, dev_t dev, uid_t uid, gid_t gid, int mode) 114 { 115 struct make_dev_args args; 116 int error; 117 118 cdev->dev = dev; 119 120 /* Setup arguments for make_dev_s() */ 121 make_dev_args_init(&args); 122 args.mda_devsw = &linuxcdevsw; 123 args.mda_uid = uid; 124 args.mda_gid = gid; 125 args.mda_mode = mode; 126 args.mda_si_drv1 = cdev; 127 128 error = make_dev_s(&args, &cdev->cdev, "%s/%d", 129 kobject_name(&cdev->kobj), MINOR(dev)); 130 if (error) 131 return (-error); 132 133 kobject_get(cdev->kobj.parent); 134 return (0); 135 } 136 137 void linux_destroy_dev(struct linux_cdev *); 138 139 static inline void 140 cdev_del(struct linux_cdev *cdev) 141 { 142 143 linux_destroy_dev(cdev); 144 kobject_put(&cdev->kobj); 145 } 146 147 struct linux_cdev *linux_find_cdev(const char *name, unsigned major, unsigned minor); 148 149 #define cdev linux_cdev 150 151 #endif /* _LINUX_CDEV_H_ */ 152