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(keycode: 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(size: 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(objp: 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(objp: 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(objp: 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

source code of linux/drivers/input/apm-power.c