1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright(c) 2015, 2016 Intel Corporation.
4 */
5
6#include <linux/cdev.h>
7#include <linux/device.h>
8#include <linux/fs.h>
9
10#include "hfi.h"
11#include "device.h"
12
13static char *hfi1_devnode(const struct device *dev, umode_t *mode)
14{
15 if (mode)
16 *mode = 0600;
17 return kasprintf(GFP_KERNEL, fmt: "%s", dev_name(dev));
18}
19
20static const struct class class = {
21 .name = "hfi1",
22 .devnode = hfi1_devnode,
23};
24
25static char *hfi1_user_devnode(const struct device *dev, umode_t *mode)
26{
27 if (mode)
28 *mode = 0666;
29 return kasprintf(GFP_KERNEL, fmt: "%s", dev_name(dev));
30}
31
32static const struct class user_class = {
33 .name = "hfi1_user",
34 .devnode = hfi1_user_devnode,
35};
36static dev_t hfi1_dev;
37
38int hfi1_cdev_init(int minor, const char *name,
39 const struct file_operations *fops,
40 struct cdev *cdev, struct device **devp,
41 bool user_accessible,
42 struct kobject *parent)
43{
44 const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
45 struct device *device = NULL;
46 int ret;
47
48 cdev_init(cdev, fops);
49 cdev->owner = THIS_MODULE;
50 cdev_set_parent(p: cdev, kobj: parent);
51 kobject_set_name(kobj: &cdev->kobj, name);
52
53 ret = cdev_add(cdev, dev, 1);
54 if (ret < 0) {
55 pr_err("Could not add cdev for minor %d, %s (err %d)\n",
56 minor, name, -ret);
57 goto done;
58 }
59
60 if (user_accessible)
61 device = device_create(cls: &user_class, NULL, devt: dev, NULL, fmt: "%s", name);
62 else
63 device = device_create(cls: &class, NULL, devt: dev, NULL, fmt: "%s", name);
64
65 if (IS_ERR(ptr: device)) {
66 ret = PTR_ERR(ptr: device);
67 device = NULL;
68 pr_err("Could not create device for minor %d, %s (err %d)\n",
69 minor, name, -ret);
70 cdev_del(cdev);
71 }
72done:
73 *devp = device;
74 return ret;
75}
76
77void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
78{
79 struct device *device = *devp;
80
81 if (device) {
82 device_unregister(dev: device);
83 *devp = NULL;
84
85 cdev_del(cdev);
86 }
87}
88
89static const char *hfi1_class_name = "hfi1";
90
91const char *class_name(void)
92{
93 return hfi1_class_name;
94}
95
96int __init dev_init(void)
97{
98 int ret;
99
100 ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME);
101 if (ret < 0) {
102 pr_err("Could not allocate chrdev region (err %d)\n", -ret);
103 goto done;
104 }
105
106 ret = class_register(class: &class);
107 if (ret) {
108 pr_err("Could not create device class (err %d)\n", -ret);
109 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
110 goto done;
111 }
112
113 ret = class_register(class: &user_class);
114 if (ret) {
115 pr_err("Could not create device class for user accessible files (err %d)\n",
116 -ret);
117 class_unregister(class: &class);
118 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
119 goto done;
120 }
121
122done:
123 return ret;
124}
125
126void dev_cleanup(void)
127{
128 class_unregister(class: &class);
129 class_unregister(class: &user_class);
130
131 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
132}
133

source code of linux/drivers/infiniband/hw/hfi1/device.c