1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#ifndef _LINUX_CDEV_H_ 30#define _LINUX_CDEV_H_ 31 32#include <linux/kobject.h> 33#include <linux/kdev_t.h> 34#include <linux/list.h> 35 36struct file_operations; 37struct inode; 38struct module; 39 40extern struct cdevsw linuxcdevsw; 41 42struct linux_cdev { 43 struct kobject kobj; 44 struct module *owner; 45 struct cdev *cdev; 46 dev_t dev; 47 const struct file_operations *ops; 48}; 49 50static inline void 51cdev_release(struct kobject *kobj) 52{ 53 struct linux_cdev *cdev; 54 55 cdev = container_of(kobj, struct linux_cdev, kobj); 56 if (cdev->cdev) 57 destroy_dev(cdev->cdev); 58 kfree(cdev); 59} 60 61static inline void 62cdev_static_release(struct kobject *kobj) 63{ 64 struct linux_cdev *cdev; 65 66 cdev = container_of(kobj, struct linux_cdev, kobj); 67 if (cdev->cdev) 68 destroy_dev(cdev->cdev); 69} 70 71static struct kobj_type cdev_ktype = { 72 .release = cdev_release, 73}; 74 75static struct kobj_type cdev_static_ktype = { 76 .release = cdev_static_release, 77}; 78 79static inline void 80cdev_init(struct linux_cdev *cdev, const struct file_operations *ops) 81{ 82 83 kobject_init(&cdev->kobj, &cdev_static_ktype); 84 cdev->ops = ops; 85} 86 87static inline struct linux_cdev * 88cdev_alloc(void) 89{ 90 struct linux_cdev *cdev; 91 92 cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK); 93 if (cdev) 94 kobject_init(&cdev->kobj, &cdev_ktype); 95 return (cdev); 96} 97 98static inline void 99cdev_put(struct linux_cdev *p) 100{ 101 kobject_put(&p->kobj); 102} 103 104static inline int 105cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count) 106{ 107 if (count != 1) 108 panic("cdev_add: Unsupported count: %d", count); 109 cdev->cdev = make_dev(&linuxcdevsw, MINOR(dev), 0, 0, 0700, 110 "%s", kobject_name(&cdev->kobj)); 111 cdev->dev = dev; 112 cdev->cdev->si_drv1 = cdev; 113 114 return (0); 115} 116 117static inline void 118cdev_del(struct linux_cdev *cdev) 119{ 120 if (cdev->cdev) { 121 destroy_dev(cdev->cdev); 122 cdev->cdev = NULL; 123 } 124 kobject_put(&cdev->kobj); 125} 126 127#define cdev linux_cdev 128 129#endif /* _LINUX_CDEV_H_ */ 130