xref: /openbmc/linux/drivers/input/apm-power.c (revision a1e58bbd)
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 #include <linux/module.h>
13 #include <linux/input.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/tty.h>
17 #include <linux/delay.h>
18 #include <linux/pm.h>
19 #include <linux/apm-emulation.h>
20 
21 static void system_power_event(unsigned int keycode)
22 {
23 	switch (keycode) {
24 	case KEY_SUSPEND:
25 		apm_queue_event(APM_USER_SUSPEND);
26 
27 		printk(KERN_INFO "apm-power: Requesting system suspend...\n");
28 		break;
29 	default:
30 		break;
31 	}
32 }
33 
34 static void apmpower_event(struct input_handle *handle, unsigned int type,
35 		        unsigned int code, int value)
36 {
37 	/* only react on key down events */
38 	if (value != 1)
39 		return;
40 
41 	switch (type) {
42 	case EV_PWR:
43 		system_power_event(code);
44 		break;
45 
46 	default:
47 		break;
48 	}
49 }
50 
51 static int apmpower_connect(struct input_handler *handler,
52 					  struct input_dev *dev,
53 					  const struct input_device_id *id)
54 {
55 	struct input_handle *handle;
56 	int error;
57 
58 	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
59 	if (!handle)
60 		return -ENOMEM;
61 
62 	handle->dev = dev;
63 	handle->handler = handler;
64 	handle->name = "apm-power";
65 
66 	error = input_register_handle(handle);
67 	if (error) {
68 		printk(KERN_ERR
69 			"apm-power: Failed to register input power handler, "
70 			"error %d\n", error);
71 		kfree(handle);
72 		return error;
73 	}
74 
75 	error = input_open_device(handle);
76 	if (error) {
77 		printk(KERN_ERR
78 			"apm-power: Failed to open input power device, "
79 			"error %d\n", error);
80 		input_unregister_handle(handle);
81 		kfree(handle);
82 		return error;
83 	}
84 
85 	return 0;
86 }
87 
88 static void apmpower_disconnect(struct input_handle *handle)
89 {
90 	input_close_device(handle);
91 	input_unregister_handle(handle);
92 	kfree(handle);
93 }
94 
95 static const struct input_device_id apmpower_ids[] = {
96 	{
97 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
98 		.evbit = { BIT_MASK(EV_PWR) },
99 	},
100 	{ },
101 };
102 
103 MODULE_DEVICE_TABLE(input, apmpower_ids);
104 
105 static struct input_handler apmpower_handler = {
106 	.event =	apmpower_event,
107 	.connect =	apmpower_connect,
108 	.disconnect =	apmpower_disconnect,
109 	.name =		"apm-power",
110 	.id_table =	apmpower_ids,
111 };
112 
113 static int __init apmpower_init(void)
114 {
115 	return input_register_handler(&apmpower_handler);
116 }
117 
118 static void __exit apmpower_exit(void)
119 {
120 	input_unregister_handler(&apmpower_handler);
121 }
122 
123 module_init(apmpower_init);
124 module_exit(apmpower_exit);
125 
126 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
127 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
128 MODULE_LICENSE("GPL");
129