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/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 45 struct linux_cdev { 46 struct kobject kobj; 47 struct module *owner; 48 struct cdev *cdev; 49 dev_t dev; 50 const struct file_operations *ops; 51 }; 52 53 static inline void 54 cdev_release(struct kobject *kobj) 55 { 56 struct linux_cdev *cdev; 57 58 cdev = container_of(kobj, struct linux_cdev, kobj); 59 if (cdev->cdev) 60 destroy_dev(cdev->cdev); 61 kfree(cdev); 62 } 63 64 static inline void 65 cdev_static_release(struct kobject *kobj) 66 { 67 struct linux_cdev *cdev; 68 69 cdev = container_of(kobj, struct linux_cdev, kobj); 70 if (cdev->cdev) 71 destroy_dev(cdev->cdev); 72 } 73 74 static struct kobj_type cdev_ktype = { 75 .release = cdev_release, 76 }; 77 78 static struct kobj_type cdev_static_ktype = { 79 .release = cdev_static_release, 80 }; 81 82 static inline void 83 cdev_init(struct linux_cdev *cdev, const struct file_operations *ops) 84 { 85 86 kobject_init(&cdev->kobj, &cdev_static_ktype); 87 cdev->ops = ops; 88 } 89 90 static inline struct linux_cdev * 91 cdev_alloc(void) 92 { 93 struct linux_cdev *cdev; 94 95 cdev = kzalloc(sizeof(struct linux_cdev), M_WAITOK); 96 if (cdev) 97 kobject_init(&cdev->kobj, &cdev_ktype); 98 return (cdev); 99 } 100 101 static inline void 102 cdev_put(struct linux_cdev *p) 103 { 104 kobject_put(&p->kobj); 105 } 106 107 static inline int 108 cdev_add(struct linux_cdev *cdev, dev_t dev, unsigned count) 109 { 110 if (count != 1) 111 panic("cdev_add: Unsupported count: %d", count); 112 cdev->cdev = make_dev(&linuxcdevsw, MINOR(dev), 0, 0, 0700, 113 "%s", kobject_name(&cdev->kobj)); 114 cdev->dev = dev; 115 cdev->cdev->si_drv1 = cdev; 116 117 return (0); 118 } 119 120 static inline void 121 cdev_del(struct linux_cdev *cdev) 122 { 123 if (cdev->cdev) { 124 destroy_dev(cdev->cdev); 125 cdev->cdev = NULL; 126 } 127 kobject_put(&cdev->kobj); 128 } 129 130 #define cdev linux_cdev 131 132 #endif /* _LINUX_CDEV_H_ */ 133