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, 2014 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/kdev_t.h> 36 #include <linux/list.h> 37 38 struct file_operations; 39 struct inode; 40 struct module; 41 42 extern struct cdevsw linuxcdevsw; 43 44 struct linux_cdev { 45 struct kobject kobj; 46 struct module *owner; 47 struct cdev *cdev; 48 dev_t dev; 49 const struct file_operations *ops; 50 }; 51 52 static inline void 53 cdev_release(struct kobject *kobj) 54 { 55 struct linux_cdev *cdev; 56 57 cdev = container_of(kobj, struct linux_cdev, kobj); 58 if (cdev->cdev) 59 destroy_dev(cdev->cdev); 60 kfree(cdev); 61 } 62 63 static inline void 64 cdev_static_release(struct kobject *kobj) 65 { 66 struct linux_cdev *cdev; 67 68 cdev = container_of(kobj, struct linux_cdev, kobj); 69 if (cdev->cdev) 70 destroy_dev(cdev->cdev); 71 } 72 73 static struct kobj_type cdev_ktype = { 74 .release = cdev_release, 75 }; 76 77 static struct kobj_type cdev_static_ktype = { 78 .release = cdev_static_release, 79 }; 80 81 static inline void 82 cdev_init(struct linux_cdev *cdev, const struct file_operations *ops) 83 { 84 85 kobject_init(&cdev->kobj, &cdev_static_ktype); 86 cdev->ops = ops; 87 } 88 89 static inline struct linux_cdev * 90 cdev_alloc(void) 91 { 92 struct linux_cdev *cdev; 93 94 cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK); 95 if (cdev) 96 kobject_init(&cdev->kobj, &cdev_ktype); 97 return (cdev); 98 } 99 100 static inline void 101 cdev_put(struct linux_cdev *p) 102 { 103 kobject_put(&p->kobj); 104 } 105 106 static inline int 107 cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count) 108 { 109 if (count != 1) 110 panic("cdev_add: Unsupported count: %d", count); 111 cdev->cdev = make_dev(&linuxcdevsw, MINOR(dev), 0, 0, 0700, 112 "%s", kobject_name(&cdev->kobj)); 113 cdev->dev = dev; 114 cdev->cdev->si_drv1 = cdev; 115 116 return (0); 117 } 118 119 static inline void 120 cdev_del(struct linux_cdev *cdev) 121 { 122 if (cdev->cdev) { 123 destroy_dev(cdev->cdev); 124 cdev->cdev = NULL; 125 } 126 kobject_put(&cdev->kobj); 127 } 128 129 #define cdev linux_cdev 130 131 #endif /* _LINUX_CDEV_H_ */ 132