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.
8 * Copyright(c) 2015 Intel Corporation.
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.
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.
21 * Copyright(c) 2015 Intel Corporation.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
27 * - Redistributions of source code must retain the above copyright
28 * notice, this list of conditions and the following disclaimer.
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30 * notice, this list of conditions and the following disclaimer in
31 * the documentation and/or other materials provided with the
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34 * contributors may be used to endorse or promote products derived
35 * from this software without specific prior written permission.
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38 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
51 #include <linux/cdev.h>
52 #include <linux/module.h>
53 #include <linux/device.h>
59 static struct class *class;
60 static struct class *user_class;
61 static dev_t hfi1_dev;
63 int hfi1_cdev_init(int minor, const char *name,
64 const struct file_operations *fops,
65 struct cdev *cdev, struct device **devp,
68 const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
69 struct device *device = NULL;
72 cdev_init(cdev, fops);
73 cdev->owner = THIS_MODULE;
74 kobject_set_name(&cdev->kobj, name);
76 ret = cdev_add(cdev, dev, 1);
78 pr_err("Could not add cdev for minor %d, %s (err %d)\n",
84 device = device_create(user_class, NULL, dev, NULL, "%s", name);
86 device = device_create(class, NULL, dev, NULL, "%s", name);
90 ret = PTR_ERR(device);
92 pr_err("Could not create device for minor %d, %s (err %d)\n",
100 void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
102 struct device *device = *devp;
105 device_unregister(device);
112 static const char *hfi1_class_name = "hfi1";
114 const char *class_name(void)
116 return hfi1_class_name;
119 static char *hfi1_devnode(struct device *dev, umode_t *mode)
123 return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
126 static const char *hfi1_class_name_user = "hfi1_user";
127 const char *class_name_user(void)
129 return hfi1_class_name_user;
132 static char *hfi1_user_devnode(struct device *dev, umode_t *mode)
136 return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
139 int __init dev_init(void)
143 ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME);
145 pr_err("Could not allocate chrdev region (err %d)\n", -ret);
149 class = class_create(THIS_MODULE, class_name());
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);
156 class->devnode = hfi1_devnode;
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",
163 class_destroy(class);
166 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
169 user_class->devnode = hfi1_user_devnode;
175 void dev_cleanup(void)
177 class_destroy(class);
180 class_destroy(user_class);
183 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);