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 #ifndef _LINUXKPI_LINUX_MISCDEVICE_H_ 30 #define _LINUXKPI_LINUX_MISCDEVICE_H_ 31 32 #define MISC_DYNAMIC_MINOR -1 33 34 #include <linux/device.h> 35 #include <linux/cdev.h> 36 37 struct miscdevice { 38 const char *name; 39 struct device *this_device; 40 const struct file_operations *fops; 41 struct cdev *cdev; 42 int minor; 43 const char *nodename; 44 umode_t mode; 45 }; 46 47 extern struct class linux_class_misc; 48 49 static inline int 50 misc_register(struct miscdevice *misc) 51 { 52 misc->this_device = device_create(&linux_class_misc, 53 &linux_root_device, 0, misc, misc->name); 54 misc->cdev = cdev_alloc(); 55 if (misc->cdev == NULL) 56 return -ENOMEM; 57 misc->cdev->owner = THIS_MODULE; 58 misc->cdev->ops = misc->fops; 59 kobject_set_name(&misc->cdev->kobj, misc->name); 60 if (cdev_add(misc->cdev, misc->this_device->devt, 1)) 61 return -EINVAL; 62 return (0); 63 } 64 65 static inline int 66 misc_deregister(struct miscdevice *misc) 67 { 68 device_destroy(&linux_class_misc, misc->this_device->devt); 69 cdev_del(misc->cdev); 70 71 return (0); 72 } 73 74 #endif /* _LINUXKPI_LINUX_MISCDEVICE_H_ */ 75