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77241056 MM |
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; | |
e116a64f | 60 | static struct class *user_class; |
77241056 MM |
61 | static dev_t hfi1_dev; |
62 | ||
63 | int hfi1_cdev_init(int minor, const char *name, | |
64 | const struct file_operations *fops, | |
e116a64f IW |
65 | struct cdev *cdev, struct device **devp, |
66 | bool user_accessible) | |
77241056 MM |
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 | ||
e116a64f IW |
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 | ||
77241056 MM |
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 | ||
e116a64f IW |
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"; | |
127 | const char *class_name_user(void) | |
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 | ||
77241056 MM |
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); | |
e116a64f | 154 | goto done; |
77241056 | 155 | } |
e116a64f IW |
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; | |
77241056 MM |
170 | |
171 | done: | |
172 | return ret; | |
173 | } | |
174 | ||
175 | void dev_cleanup(void) | |
176 | { | |
e116a64f IW |
177 | class_destroy(class); |
178 | class = NULL; | |
179 | ||
180 | class_destroy(user_class); | |
181 | user_class = NULL; | |
77241056 MM |
182 | |
183 | unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); | |
184 | } |