xref: /openbmc/linux/drivers/input/evbug.c (revision b830f94f)
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 
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 
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 
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 
92 static int __init evbug_init(void)
93 {
94 	return input_register_handler(&evbug_handler);
95 }
96 
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