Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * This file is provided under a dual BSD/GPLv2 license. When using or |
| 4 | * redistributing this file, you may do so under either license. |
| 5 | * |
| 6 | * GPL LICENSE SUMMARY |
| 7 | * |
| 8 | * Copyright(c) 2015 Intel Corporation. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of version 2 of the GNU General Public License as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * BSD LICENSE |
| 20 | * |
| 21 | * Copyright(c) 2015 Intel Corporation. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * |
| 27 | * - Redistributions of source code must retain the above copyright |
| 28 | * notice, this list of conditions and the following disclaimer. |
| 29 | * - Redistributions in binary form must reproduce the above copyright |
| 30 | * notice, this list of conditions and the following disclaimer in |
| 31 | * the documentation and/or other materials provided with the |
| 32 | * distribution. |
| 33 | * - Neither the name of Intel Corporation nor the names of its |
| 34 | * contributors may be used to endorse or promote products derived |
| 35 | * from this software without specific prior written permission. |
| 36 | * |
| 37 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 38 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 39 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 40 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 41 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 42 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 43 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 44 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 45 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 46 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 47 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 48 | * |
| 49 | */ |
| 50 | |
| 51 | #include <linux/cdev.h> |
| 52 | #include <linux/module.h> |
| 53 | #include <linux/device.h> |
| 54 | #include <linux/fs.h> |
| 55 | |
| 56 | #include "hfi.h" |
| 57 | #include "device.h" |
| 58 | |
| 59 | static struct class *class; |
Ira Weiny | e116a64 | 2015-09-17 13:47:49 -0400 | [diff] [blame] | 60 | static struct class *user_class; |
Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 61 | static dev_t hfi1_dev; |
| 62 | |
| 63 | int hfi1_cdev_init(int minor, const char *name, |
| 64 | const struct file_operations *fops, |
Ira Weiny | e116a64 | 2015-09-17 13:47:49 -0400 | [diff] [blame] | 65 | struct cdev *cdev, struct device **devp, |
| 66 | bool user_accessible) |
Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 67 | { |
| 68 | const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor); |
| 69 | struct device *device = NULL; |
| 70 | int ret; |
| 71 | |
| 72 | cdev_init(cdev, fops); |
| 73 | cdev->owner = THIS_MODULE; |
| 74 | kobject_set_name(&cdev->kobj, name); |
| 75 | |
| 76 | ret = cdev_add(cdev, dev, 1); |
| 77 | if (ret < 0) { |
| 78 | pr_err("Could not add cdev for minor %d, %s (err %d)\n", |
| 79 | minor, name, -ret); |
| 80 | goto done; |
| 81 | } |
| 82 | |
Ira Weiny | e116a64 | 2015-09-17 13:47:49 -0400 | [diff] [blame] | 83 | if (user_accessible) |
| 84 | device = device_create(user_class, NULL, dev, NULL, "%s", name); |
| 85 | else |
| 86 | device = device_create(class, NULL, dev, NULL, "%s", name); |
| 87 | |
Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 88 | if (!IS_ERR(device)) |
| 89 | goto done; |
| 90 | ret = PTR_ERR(device); |
| 91 | device = NULL; |
| 92 | pr_err("Could not create device for minor %d, %s (err %d)\n", |
| 93 | minor, name, -ret); |
| 94 | cdev_del(cdev); |
| 95 | done: |
| 96 | *devp = device; |
| 97 | return ret; |
| 98 | } |
| 99 | |
| 100 | void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp) |
| 101 | { |
| 102 | struct device *device = *devp; |
| 103 | |
| 104 | if (device) { |
| 105 | device_unregister(device); |
| 106 | *devp = NULL; |
| 107 | |
| 108 | cdev_del(cdev); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | static const char *hfi1_class_name = "hfi1"; |
| 113 | |
| 114 | const char *class_name(void) |
| 115 | { |
| 116 | return hfi1_class_name; |
| 117 | } |
| 118 | |
Ira Weiny | e116a64 | 2015-09-17 13:47:49 -0400 | [diff] [blame] | 119 | static char *hfi1_devnode(struct device *dev, umode_t *mode) |
| 120 | { |
| 121 | if (mode) |
| 122 | *mode = 0600; |
| 123 | return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); |
| 124 | } |
| 125 | |
| 126 | static const char *hfi1_class_name_user = "hfi1_user"; |
Geliang Tang | 96a660d | 2015-09-21 22:18:14 +0800 | [diff] [blame] | 127 | static const char *class_name_user(void) |
Ira Weiny | e116a64 | 2015-09-17 13:47:49 -0400 | [diff] [blame] | 128 | { |
| 129 | return hfi1_class_name_user; |
| 130 | } |
| 131 | |
| 132 | static char *hfi1_user_devnode(struct device *dev, umode_t *mode) |
| 133 | { |
| 134 | if (mode) |
| 135 | *mode = 0666; |
| 136 | return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); |
| 137 | } |
| 138 | |
Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 139 | int __init dev_init(void) |
| 140 | { |
| 141 | int ret; |
| 142 | |
| 143 | ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME); |
| 144 | if (ret < 0) { |
| 145 | pr_err("Could not allocate chrdev region (err %d)\n", -ret); |
| 146 | goto done; |
| 147 | } |
| 148 | |
| 149 | class = class_create(THIS_MODULE, class_name()); |
| 150 | if (IS_ERR(class)) { |
| 151 | ret = PTR_ERR(class); |
| 152 | pr_err("Could not create device class (err %d)\n", -ret); |
| 153 | unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); |
Ira Weiny | e116a64 | 2015-09-17 13:47:49 -0400 | [diff] [blame] | 154 | goto done; |
Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 155 | } |
Ira Weiny | e116a64 | 2015-09-17 13:47:49 -0400 | [diff] [blame] | 156 | class->devnode = hfi1_devnode; |
| 157 | |
| 158 | user_class = class_create(THIS_MODULE, class_name_user()); |
| 159 | if (IS_ERR(user_class)) { |
| 160 | ret = PTR_ERR(user_class); |
| 161 | pr_err("Could not create device class for user accessible files (err %d)\n", |
| 162 | -ret); |
| 163 | class_destroy(class); |
| 164 | class = NULL; |
| 165 | user_class = NULL; |
| 166 | unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); |
| 167 | goto done; |
| 168 | } |
| 169 | user_class->devnode = hfi1_user_devnode; |
Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 170 | |
| 171 | done: |
| 172 | return ret; |
| 173 | } |
| 174 | |
| 175 | void dev_cleanup(void) |
| 176 | { |
Ira Weiny | e116a64 | 2015-09-17 13:47:49 -0400 | [diff] [blame] | 177 | class_destroy(class); |
| 178 | class = NULL; |
| 179 | |
| 180 | class_destroy(user_class); |
| 181 | user_class = NULL; |
Mike Marciniszyn | 7724105 | 2015-07-30 15:17:43 -0400 | [diff] [blame] | 182 | |
| 183 | unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); |
| 184 | } |