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