1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  Input Power Event -> APM Bridge
4 *
5 *  Copyright (c) 2007 Richard Purdie
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/input.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/tty.h>
15#include <linux/delay.h>
16#include <linux/pm.h>
17#include <linux/apm-emulation.h>
18
19static void system_power_event(unsigned int keycode)
20{
21	switch (keycode) {
22	case KEY_SUSPEND:
23		apm_queue_event(APM_USER_SUSPEND);
24		pr_info("Requesting system suspend...\n");
25		break;
26	default:
27		break;
28	}
29}
30
31static void apmpower_event(struct input_handle *handle, unsigned int type,
32			   unsigned int code, int value)
33{
34	/* only react on key down events */
35	if (value != 1)
36		return;
37
38	switch (type) {
39	case EV_PWR:
40		system_power_event(code);
41		break;
42
43	default:
44		break;
45	}
46}
47
48static int apmpower_connect(struct input_handler *handler,
49					  struct input_dev *dev,
50					  const struct input_device_id *id)
51{
52	struct input_handle *handle;
53	int error;
54
55	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
56	if (!handle)
57		return -ENOMEM;
58
59	handle->dev = dev;
60	handle->handler = handler;
61	handle->name = "apm-power";
62
63	error = input_register_handle(handle);
64	if (error) {
65		pr_err("Failed to register input power handler, error %d\n",
66		       error);
67		kfree(handle);
68		return error;
69	}
70
71	error = input_open_device(handle);
72	if (error) {
73		pr_err("Failed to open input power device, error %d\n", error);
74		input_unregister_handle(handle);
75		kfree(handle);
76		return error;
77	}
78
79	return 0;
80}
81
82static void apmpower_disconnect(struct input_handle *handle)
83{
84	input_close_device(handle);
85	input_unregister_handle(handle);
86	kfree(handle);
87}
88
89static const struct input_device_id apmpower_ids[] = {
90	{
91		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
92		.evbit = { BIT_MASK(EV_PWR) },
93	},
94	{ },
95};
96
97MODULE_DEVICE_TABLE(input, apmpower_ids);
98
99static struct input_handler apmpower_handler = {
100	.event =	apmpower_event,
101	.connect =	apmpower_connect,
102	.disconnect =	apmpower_disconnect,
103	.name =		"apm-power",
104	.id_table =	apmpower_ids,
105};
106
107static int __init apmpower_init(void)
108{
109	return input_register_handler(&apmpower_handler);
110}
111
112static void __exit apmpower_exit(void)
113{
114	input_unregister_handler(&apmpower_handler);
115}
116
117module_init(apmpower_init);
118module_exit(apmpower_exit);
119
120MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
121MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
122MODULE_LICENSE("GPL");
123