1/*
2 *  Input Power Event -> APM Bridge
3 *
4 *  Copyright (c) 2007 Richard Purdie
5 *
6 *  This program is free software; you can redistribute it and/or modify
7 *  it under the terms of the GNU General Public License version 2 as
8 *  published by the Free Software Foundation.
9 *
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/module.h>
15#include <linux/input.h>
16#include <linux/slab.h>
17#include <linux/init.h>
18#include <linux/tty.h>
19#include <linux/delay.h>
20#include <linux/pm.h>
21#include <linux/apm-emulation.h>
22
23static void system_power_event(unsigned int keycode)
24{
25	switch (keycode) {
26	case KEY_SUSPEND:
27		apm_queue_event(APM_USER_SUSPEND);
28		pr_info("Requesting system suspend...\n");
29		break;
30	default:
31		break;
32	}
33}
34
35static void apmpower_event(struct input_handle *handle, unsigned int type,
36			   unsigned int code, int value)
37{
38	/* only react on key down events */
39	if (value != 1)
40		return;
41
42	switch (type) {
43	case EV_PWR:
44		system_power_event(code);
45		break;
46
47	default:
48		break;
49	}
50}
51
52static int apmpower_connect(struct input_handler *handler,
53					  struct input_dev *dev,
54					  const struct input_device_id *id)
55{
56	struct input_handle *handle;
57	int error;
58
59	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
60	if (!handle)
61		return -ENOMEM;
62
63	handle->dev = dev;
64	handle->handler = handler;
65	handle->name = "apm-power";
66
67	error = input_register_handle(handle);
68	if (error) {
69		pr_err("Failed to register input power handler, error %d\n",
70		       error);
71		kfree(handle);
72		return error;
73	}
74
75	error = input_open_device(handle);
76	if (error) {
77		pr_err("Failed to open input power device, error %d\n", error);
78		input_unregister_handle(handle);
79		kfree(handle);
80		return error;
81	}
82
83	return 0;
84}
85
86static void apmpower_disconnect(struct input_handle *handle)
87{
88	input_close_device(handle);
89	input_unregister_handle(handle);
90	kfree(handle);
91}
92
93static const struct input_device_id apmpower_ids[] = {
94	{
95		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
96		.evbit = { BIT_MASK(EV_PWR) },
97	},
98	{ },
99};
100
101MODULE_DEVICE_TABLE(input, apmpower_ids);
102
103static struct input_handler apmpower_handler = {
104	.event =	apmpower_event,
105	.connect =	apmpower_connect,
106	.disconnect =	apmpower_disconnect,
107	.name =		"apm-power",
108	.id_table =	apmpower_ids,
109};
110
111static int __init apmpower_init(void)
112{
113	return input_register_handler(&apmpower_handler);
114}
115
116static void __exit apmpower_exit(void)
117{
118	input_unregister_handler(&apmpower_handler);
119}
120
121module_init(apmpower_init);
122module_exit(apmpower_exit);
123
124MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
125MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
126MODULE_LICENSE("GPL");
127