2 * Copyright(c) 2015, 2016 Intel Corporation.
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
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25 * notice, this list of conditions and the following disclaimer.
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44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 #include <linux/cdev.h>
49 #include <linux/module.h>
50 #include <linux/device.h>
56 static struct class *class;
57 static struct class *user_class;
58 static dev_t hfi1_dev;
60 int hfi1_cdev_init(int minor, const char *name,
61 const struct file_operations *fops,
62 struct cdev *cdev, struct device **devp,
64 struct kobject *parent)
66 const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
67 struct device *device = NULL;
70 cdev_init(cdev, fops);
71 cdev->owner = THIS_MODULE;
72 cdev_set_parent(cdev, parent);
73 kobject_set_name(&cdev->kobj, name);
75 ret = cdev_add(cdev, dev, 1);
77 pr_err("Could not add cdev for minor %d, %s (err %d)\n",
83 device = device_create(user_class, NULL, dev, NULL, "%s", name);
85 device = device_create(class, NULL, dev, NULL, "%s", name);
88 ret = PTR_ERR(device);
90 pr_err("Could not create device for minor %d, %s (err %d)\n",
99 void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
101 struct device *device = *devp;
104 device_unregister(device);
111 static const char *hfi1_class_name = "hfi1";
113 const char *class_name(void)
115 return hfi1_class_name;
118 static char *hfi1_devnode(struct device *dev, umode_t *mode)
122 return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
125 static const char *hfi1_class_name_user = "hfi1_user";
126 static const char *class_name_user(void)
128 return hfi1_class_name_user;
131 static char *hfi1_user_devnode(struct device *dev, umode_t *mode)
135 return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
138 int __init dev_init(void)
142 ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME);
144 pr_err("Could not allocate chrdev region (err %d)\n", -ret);
148 class = class_create(THIS_MODULE, class_name());
150 ret = PTR_ERR(class);
151 pr_err("Could not create device class (err %d)\n", -ret);
152 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
155 class->devnode = hfi1_devnode;
157 user_class = class_create(THIS_MODULE, class_name_user());
158 if (IS_ERR(user_class)) {
159 ret = PTR_ERR(user_class);
160 pr_err("Could not create device class for user accessible files (err %d)\n",
162 class_destroy(class);
165 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
168 user_class->devnode = hfi1_user_devnode;
174 void dev_cleanup(void)
176 class_destroy(class);
179 class_destroy(user_class);
182 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);