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
hfi1_devnode(const struct device * dev,umode_t * mode)13 static char *hfi1_devnode(const struct device *dev, umode_t *mode)
14 {
15 if (mode)
16 *mode = 0600;
17 return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
18 }
19
20 static const struct class class = {
21 .name = "hfi1",
22 .devnode = hfi1_devnode,
23 };
24
hfi1_user_devnode(const struct device * dev,umode_t * mode)25 static char *hfi1_user_devnode(const struct device *dev, umode_t *mode)
26 {
27 if (mode)
28 *mode = 0666;
29 return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
30 }
31
32 static const struct class user_class = {
33 .name = "hfi1_user",
34 .devnode = hfi1_user_devnode,
35 };
36 static dev_t hfi1_dev;
37
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)38 int 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(cdev, parent);
51 kobject_set_name(&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(&user_class, NULL, dev, NULL, "%s", name);
62 else
63 device = device_create(&class, NULL, dev, NULL, "%s", name);
64
65 if (IS_ERR(device)) {
66 ret = PTR_ERR(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 }
72 done:
73 *devp = device;
74 return ret;
75 }
76
hfi1_cdev_cleanup(struct cdev * cdev,struct device ** devp)77 void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
78 {
79 struct device *device = *devp;
80
81 if (device) {
82 device_unregister(device);
83 *devp = NULL;
84
85 cdev_del(cdev);
86 }
87 }
88
89 static const char *hfi1_class_name = "hfi1";
90
class_name(void)91 const char *class_name(void)
92 {
93 return hfi1_class_name;
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 ret = class_register(&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(&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);
118 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
119 goto done;
120 }
121
122 done:
123 return ret;
124 }
125
dev_cleanup(void)126 void dev_cleanup(void)
127 {
128 class_unregister(&class);
129 class_unregister(&user_class);
130
131 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
132 }
133