1/*
2 * Copyright(c) 2015, 2016 Intel Corporation.
3 *
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.
6 *
7 * GPL LICENSE SUMMARY
8 *
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.
12 *
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.
17 *
18 * BSD LICENSE
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 *
24 *  - Redistributions of source code must retain the above copyright
25 *    notice, this list of conditions and the following disclaimer.
26 *  - Redistributions in binary form must reproduce the above copyright
27 *    notice, this list of conditions and the following disclaimer in
28 *    the documentation and/or other materials provided with the
29 *    distribution.
30 *  - Neither the name of Intel Corporation nor the names of its
31 *    contributors may be used to endorse or promote products derived
32 *    from this software without specific prior written permission.
33 *
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45 *
46 */
47
48#include <linux/cdev.h>
49#include <linux/module.h>
50#include <linux/device.h>
51#include <linux/fs.h>
52
53#include "hfi.h"
54#include "device.h"
55
56static struct class *class;
57static struct class *user_class;
58static dev_t hfi1_dev;
59
60int hfi1_cdev_init(int minor, const char *name,
61		   const struct file_operations *fops,
62		   struct cdev *cdev, struct device **devp,
63		   bool user_accessible,
64		   struct kobject *parent)
65{
66	const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
67	struct device *device = NULL;
68	int ret;
69
70	cdev_init(cdev, fops);
71	cdev->owner = THIS_MODULE;
72	cdev_set_parent(cdev, parent);
73	kobject_set_name(&cdev->kobj, name);
74
75	ret = cdev_add(cdev, dev, 1);
76	if (ret < 0) {
77		pr_err("Could not add cdev for minor %d, %s (err %d)\n",
78		       minor, name, -ret);
79		goto done;
80	}
81
82	if (user_accessible)
83		device = device_create(user_class, NULL, dev, NULL, "%s", name);
84	else
85		device = device_create(class, NULL, dev, NULL, "%s", name);
86
87	if (IS_ERR(device)) {
88		ret = PTR_ERR(device);
89		device = NULL;
90		pr_err("Could not create device for minor %d, %s (err %d)\n",
91			minor, name, -ret);
92		cdev_del(cdev);
93	}
94done:
95	*devp = device;
96	return ret;
97}
98
99void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
100{
101	struct device *device = *devp;
102
103	if (device) {
104		device_unregister(device);
105		*devp = NULL;
106
107		cdev_del(cdev);
108	}
109}
110
111static const char *hfi1_class_name = "hfi1";
112
113const char *class_name(void)
114{
115	return hfi1_class_name;
116}
117
118static char *hfi1_devnode(struct device *dev, umode_t *mode)
119{
120	if (mode)
121		*mode = 0600;
122	return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
123}
124
125static const char *hfi1_class_name_user = "hfi1_user";
126static const char *class_name_user(void)
127{
128	return hfi1_class_name_user;
129}
130
131static char *hfi1_user_devnode(struct device *dev, umode_t *mode)
132{
133	if (mode)
134		*mode = 0666;
135	return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
136}
137
138int __init dev_init(void)
139{
140	int ret;
141
142	ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME);
143	if (ret < 0) {
144		pr_err("Could not allocate chrdev region (err %d)\n", -ret);
145		goto done;
146	}
147
148	class = class_create(THIS_MODULE, class_name());
149	if (IS_ERR(class)) {
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);
153		goto done;
154	}
155	class->devnode = hfi1_devnode;
156
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",
161		       -ret);
162		class_destroy(class);
163		class = NULL;
164		user_class = NULL;
165		unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
166		goto done;
167	}
168	user_class->devnode = hfi1_user_devnode;
169
170done:
171	return ret;
172}
173
174void dev_cleanup(void)
175{
176	class_destroy(class);
177	class = NULL;
178
179	class_destroy(user_class);
180	user_class = NULL;
181
182	unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
183}
184