Root/drivers/input/evbug.c

1/*
2 * Copyright (c) 1999-2001 Vojtech Pavlik
3 */
4
5/*
6 * Input driver event debug module - dumps all events into syslog
7 */
8
9/*
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * Should you need to contact me, the author, you can do so either by
25 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
26 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
27 */
28
29#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31#include <linux/slab.h>
32#include <linux/module.h>
33#include <linux/input.h>
34#include <linux/init.h>
35#include <linux/device.h>
36
37MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
38MODULE_DESCRIPTION("Input driver event debug module");
39MODULE_LICENSE("GPL");
40
41static void evbug_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
42{
43    printk(KERN_DEBUG pr_fmt("Event. Dev: %s, Type: %d, Code: %d, Value: %d\n"),
44           dev_name(&handle->dev->dev), type, code, value);
45}
46
47static int evbug_connect(struct input_handler *handler, struct input_dev *dev,
48             const struct input_device_id *id)
49{
50    struct input_handle *handle;
51    int error;
52
53    handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
54    if (!handle)
55        return -ENOMEM;
56
57    handle->dev = dev;
58    handle->handler = handler;
59    handle->name = "evbug";
60
61    error = input_register_handle(handle);
62    if (error)
63        goto err_free_handle;
64
65    error = input_open_device(handle);
66    if (error)
67        goto err_unregister_handle;
68
69    printk(KERN_DEBUG pr_fmt("Connected device: %s (%s at %s)\n"),
70           dev_name(&dev->dev),
71           dev->name ?: "unknown",
72           dev->phys ?: "unknown");
73
74    return 0;
75
76 err_unregister_handle:
77    input_unregister_handle(handle);
78 err_free_handle:
79    kfree(handle);
80    return error;
81}
82
83static void evbug_disconnect(struct input_handle *handle)
84{
85    printk(KERN_DEBUG pr_fmt("Disconnected device: %s\n"),
86           dev_name(&handle->dev->dev));
87
88    input_close_device(handle);
89    input_unregister_handle(handle);
90    kfree(handle);
91}
92
93static const struct input_device_id evbug_ids[] = {
94    { .driver_info = 1 }, /* Matches all devices */
95    { }, /* Terminating zero entry */
96};
97
98MODULE_DEVICE_TABLE(input, evbug_ids);
99
100static struct input_handler evbug_handler = {
101    .event = evbug_event,
102    .connect = evbug_connect,
103    .disconnect = evbug_disconnect,
104    .name = "evbug",
105    .id_table = evbug_ids,
106};
107
108static int __init evbug_init(void)
109{
110    return input_register_handler(&evbug_handler);
111}
112
113static void __exit evbug_exit(void)
114{
115    input_unregister_handler(&evbug_handler);
116}
117
118module_init(evbug_init);
119module_exit(evbug_exit);
120

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