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
59static struct class *class;
60static struct class *user_class;
61static dev_t hfi1_dev;
62
63int 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);
95done:
96	*devp = device;
97	return ret;
98}
99
100void 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
112static const char *hfi1_class_name = "hfi1";
113
114const char *class_name(void)
115{
116	return hfi1_class_name;
117}
118
119static 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
126static const char *hfi1_class_name_user = "hfi1_user";
127static const char *class_name_user(void)
128{
129	return hfi1_class_name_user;
130}
131
132static 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
139int __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
171done:
172	return ret;
173}
174
175void 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