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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | /* * Copyright(c) 2015, 2016 Intel Corporation. * * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * BSD LICENSE * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * - Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include <linux/cdev.h> #include <linux/module.h> #include <linux/device.h> #include <linux/fs.h> #include "hfi.h" #include "device.h" static struct class *class; static struct class *user_class; static dev_t hfi1_dev; int hfi1_cdev_init(int minor, const char *name, const struct file_operations *fops, struct cdev *cdev, struct device **devp, bool user_accessible, struct kobject *parent) { const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor); struct device *device = NULL; int ret; cdev_init(cdev, fops); cdev->owner = THIS_MODULE; cdev_set_parent(cdev, parent); kobject_set_name(&cdev->kobj, name); ret = cdev_add(cdev, dev, 1); if (ret < 0) { pr_err("Could not add cdev for minor %d, %s (err %d)\n", minor, name, -ret); goto done; } if (user_accessible) device = device_create(user_class, NULL, dev, NULL, "%s", name); else device = device_create(class, NULL, dev, NULL, "%s", name); if (IS_ERR(device)) { ret = PTR_ERR(device); device = NULL; pr_err("Could not create device for minor %d, %s (err %d)\n", minor, name, -ret); cdev_del(cdev); } done: *devp = device; return ret; } void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp) { struct device *device = *devp; if (device) { device_unregister(device); *devp = NULL; cdev_del(cdev); } } static const char *hfi1_class_name = "hfi1"; const char *class_name(void) { return hfi1_class_name; } static char *hfi1_devnode(struct device *dev, umode_t *mode) { if (mode) *mode = 0600; return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); } static const char *hfi1_class_name_user = "hfi1_user"; static const char *class_name_user(void) { return hfi1_class_name_user; } static char *hfi1_user_devnode(struct device *dev, umode_t *mode) { if (mode) *mode = 0666; return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); } int __init dev_init(void) { int ret; ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME); if (ret < 0) { pr_err("Could not allocate chrdev region (err %d)\n", -ret); goto done; } class = class_create(THIS_MODULE, class_name()); if (IS_ERR(class)) { ret = PTR_ERR(class); pr_err("Could not create device class (err %d)\n", -ret); unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); goto done; } class->devnode = hfi1_devnode; user_class = class_create(THIS_MODULE, class_name_user()); if (IS_ERR(user_class)) { ret = PTR_ERR(user_class); pr_err("Could not create device class for user accessible files (err %d)\n", -ret); class_destroy(class); class = NULL; user_class = NULL; unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); goto done; } user_class->devnode = hfi1_user_devnode; done: return ret; } void dev_cleanup(void) { class_destroy(class); class = NULL; class_destroy(user_class); user_class = NULL; unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); } |