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, "%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, "%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(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	}
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(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);
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
122done:
123	return ret;
124}
125
126void dev_cleanup(void)
127{
128	class_unregister(&class);
129	class_unregister(&user_class);
130
131	unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
132}
133