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;
60 static struct class *user_class;
61 static dev_t hfi1_dev;
62
hfi1_cdev_init(int minor,const char * name,const struct file_operations * fops,struct cdev * cdev,struct device ** devp,bool user_accessible)63 int hfi1_cdev_init(int minor, const char *name,
64 const struct file_operations *fops,
65 struct cdev *cdev, struct device **devp,
66 bool user_accessible)
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
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
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
hfi1_cdev_cleanup(struct cdev * cdev,struct device ** devp)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
class_name(void)114 const char *class_name(void)
115 {
116 return hfi1_class_name;
117 }
118
hfi1_devnode(struct device * dev,umode_t * mode)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";
class_name_user(void)127 static const char *class_name_user(void)
128 {
129 return hfi1_class_name_user;
130 }
131
hfi1_user_devnode(struct device * dev,umode_t * mode)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
dev_init(void)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);
154 goto done;
155 }
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;
170
171 done:
172 return ret;
173 }
174
dev_cleanup(void)175 void dev_cleanup(void)
176 {
177 class_destroy(class);
178 class = NULL;
179
180 class_destroy(user_class);
181 user_class = NULL;
182
183 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
184 }
185