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/module.h>
8 #include <linux/device.h>
9 #include <linux/fs.h>
10
11 #include "hfi.h"
12 #include "device.h"
13
14 static struct class *class;
15 static struct class *user_class;
16 static dev_t hfi1_dev;
17
hfi1_cdev_init(int minor,const char * name,const struct file_operations * fops,struct cdev * cdev,struct device ** devp,bool user_accessible,struct kobject * parent)18 int hfi1_cdev_init(int minor, const char *name,
19 const struct file_operations *fops,
20 struct cdev *cdev, struct device **devp,
21 bool user_accessible,
22 struct kobject *parent)
23 {
24 const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
25 struct device *device = NULL;
26 int ret;
27
28 cdev_init(cdev, fops);
29 cdev->owner = THIS_MODULE;
30 cdev_set_parent(cdev, parent);
31 kobject_set_name(&cdev->kobj, name);
32
33 ret = cdev_add(cdev, dev, 1);
34 if (ret < 0) {
35 pr_err("Could not add cdev for minor %d, %s (err %d)\n",
36 minor, name, -ret);
37 goto done;
38 }
39
40 if (user_accessible)
41 device = device_create(user_class, NULL, dev, NULL, "%s", name);
42 else
43 device = device_create(class, NULL, dev, NULL, "%s", name);
44
45 if (IS_ERR(device)) {
46 ret = PTR_ERR(device);
47 device = NULL;
48 pr_err("Could not create device for minor %d, %s (err %d)\n",
49 minor, name, -ret);
50 cdev_del(cdev);
51 }
52 done:
53 *devp = device;
54 return ret;
55 }
56
hfi1_cdev_cleanup(struct cdev * cdev,struct device ** devp)57 void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
58 {
59 struct device *device = *devp;
60
61 if (device) {
62 device_unregister(device);
63 *devp = NULL;
64
65 cdev_del(cdev);
66 }
67 }
68
69 static const char *hfi1_class_name = "hfi1";
70
class_name(void)71 const char *class_name(void)
72 {
73 return hfi1_class_name;
74 }
75
hfi1_devnode(struct device * dev,umode_t * mode)76 static char *hfi1_devnode(struct device *dev, umode_t *mode)
77 {
78 if (mode)
79 *mode = 0600;
80 return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
81 }
82
83 static const char *hfi1_class_name_user = "hfi1_user";
class_name_user(void)84 static const char *class_name_user(void)
85 {
86 return hfi1_class_name_user;
87 }
88
hfi1_user_devnode(struct device * dev,umode_t * mode)89 static char *hfi1_user_devnode(struct device *dev, umode_t *mode)
90 {
91 if (mode)
92 *mode = 0666;
93 return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
94 }
95
dev_init(void)96 int __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 class = class_create(THIS_MODULE, class_name());
107 if (IS_ERR(class)) {
108 ret = PTR_ERR(class);
109 pr_err("Could not create device class (err %d)\n", -ret);
110 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
111 goto done;
112 }
113 class->devnode = hfi1_devnode;
114
115 user_class = class_create(THIS_MODULE, class_name_user());
116 if (IS_ERR(user_class)) {
117 ret = PTR_ERR(user_class);
118 pr_err("Could not create device class for user accessible files (err %d)\n",
119 -ret);
120 class_destroy(class);
121 class = NULL;
122 user_class = NULL;
123 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
124 goto done;
125 }
126 user_class->devnode = hfi1_user_devnode;
127
128 done:
129 return ret;
130 }
131
dev_cleanup(void)132 void dev_cleanup(void)
133 {
134 class_destroy(class);
135 class = NULL;
136
137 class_destroy(user_class);
138 user_class = NULL;
139
140 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
141 }
142
