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
21 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
22 MODULE_DESCRIPTION("Input driver event debug module");
23 MODULE_LICENSE("GPL");
24
evbug_event(struct input_handle * handle,unsigned int type,unsigned int code,int value)25 static 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
evbug_connect(struct input_handler * handler,struct input_dev * dev,const struct input_device_id * id)31 static 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
evbug_disconnect(struct input_handle * handle)67 static 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
77 static const struct input_device_id evbug_ids[] = {
78 { .driver_info = 1 }, /* Matches all devices */
79 { }, /* Terminating zero entry */
80 };
81
82 MODULE_DEVICE_TABLE(input, evbug_ids);
83
84 static 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
evbug_init(void)92 static int __init evbug_init(void)
93 {
94 return input_register_handler(&evbug_handler);
95 }
96
evbug_exit(void)97 static void __exit evbug_exit(void)
98 {
99 input_unregister_handler(&evbug_handler);
100 }
101
102 module_init(evbug_init);
103 module_exit(evbug_exit);
104
