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