xref: /kernel/linux/linux-5.10/drivers/input/evbug.c (revision 8c2ecf20) 
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Copyright (c) 1999-2001 Vojtech Pavlik
4 */
5
6/*
7 *  Input driver event debug module - dumps all events into syslog
8 */
9
10/*
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/input.h>
18#include <linux/init.h>
19#include <linux/device.h>
20
21MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
22MODULE_DESCRIPTION("Input driver event debug module");
23MODULE_LICENSE("GPL");
24
25static void evbug_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
26{
27	printk(KERN_DEBUG pr_fmt("Event. Dev: %s, Type: %d, Code: %d, Value: %d\n"),
28	       dev_name(&handle->dev->dev), type, code, value);
29}
30
31static int evbug_connect(struct input_handler *handler, struct input_dev *dev,
32			 const struct input_device_id *id)
33{
34	struct input_handle *handle;
35	int error;
36
37	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
38	if (!handle)
39		return -ENOMEM;
40
41	handle->dev = dev;
42	handle->handler = handler;
43	handle->name = "evbug";
44
45	error = input_register_handle(handle);
46	if (error)
47		goto err_free_handle;
48
49	error = input_open_device(handle);
50	if (error)
51		goto err_unregister_handle;
52
53	printk(KERN_DEBUG pr_fmt("Connected device: %s (%s at %s)\n"),
54	       dev_name(&dev->dev),
55	       dev->name ?: "unknown",
56	       dev->phys ?: "unknown");
57
58	return 0;
59
60 err_unregister_handle:
61	input_unregister_handle(handle);
62 err_free_handle:
63	kfree(handle);
64	return error;
65}
66
67static void evbug_disconnect(struct input_handle *handle)
68{
69	printk(KERN_DEBUG pr_fmt("Disconnected device: %s\n"),
70	       dev_name(&handle->dev->dev));
71
72	input_close_device(handle);
73	input_unregister_handle(handle);
74	kfree(handle);
75}
76
77static const struct input_device_id evbug_ids[] = {
78	{ .driver_info = 1 },	/* Matches all devices */
79	{ },			/* Terminating zero entry */
80};
81
82MODULE_DEVICE_TABLE(input, evbug_ids);
83
84static struct input_handler evbug_handler = {
85	.event =	evbug_event,
86	.connect =	evbug_connect,
87	.disconnect =	evbug_disconnect,
88	.name =		"evbug",
89	.id_table =	evbug_ids,
90};
91
92static int __init evbug_init(void)
93{
94	return input_register_handler(&evbug_handler);
95}
96
97static void __exit evbug_exit(void)
98{
99	input_unregister_handler(&evbug_handler);
100}
101
102module_init(evbug_init);
103module_exit(evbug_exit);
104