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
system_power_event(unsigned int keycode)19 static 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
apmpower_event(struct input_handle * handle,unsigned int type,unsigned int code,int value)31 static 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
apmpower_connect(struct input_handler * handler,struct input_dev * dev,const struct input_device_id * id)48 static 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
apmpower_disconnect(struct input_handle * handle)82 static void apmpower_disconnect(struct input_handle *handle)
83 {
84 input_close_device(handle);
85 input_unregister_handle(handle);
86 kfree(handle);
87 }
88
89 static 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
97 MODULE_DEVICE_TABLE(input, apmpower_ids);
98
99 static 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
apmpower_init(void)107 static int __init apmpower_init(void)
108 {
109 return input_register_handler(&apmpower_handler);
110 }
111
apmpower_exit(void)112 static void __exit apmpower_exit(void)
113 {
114 input_unregister_handler(&apmpower_handler);
115 }
116
117 module_init(apmpower_init);
118 module_exit(apmpower_exit);
119
120 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
121 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
122 MODULE_LICENSE("GPL");
123