xref: /linux/drivers/input/apm-power.c (revision ed3174d93c342b8b2eeba6bbd124707d55304a7b)
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 	handler->private = handle;
67 
68 	error = input_register_handle(handle);
69 	if (error) {
70 		printk(KERN_ERR
71 			"apm-power: Failed to register input power handler, "
72 			"error %d\n", error);
73 		kfree(handle);
74 		return error;
75 	}
76 
77 	error = input_open_device(handle);
78 	if (error) {
79 		printk(KERN_ERR
80 			"apm-power: Failed to open input power device, "
81 			"error %d\n", error);
82 		input_unregister_handle(handle);
83 		kfree(handle);
84 		return error;
85 	}
86 
87 	return 0;
88 }
89 
90 static void apmpower_disconnect(struct input_handle *handler)
91 {
92 	struct input_handle *handle = handler->private;
93 
94 	input_close_device(handle);
95 	kfree(handle);
96 }
97 
98 static const struct input_device_id apmpower_ids[] = {
99 	{
100 		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
101 		.evbit = { BIT_MASK(EV_PWR) },
102 	},
103 	{ },
104 };
105 
106 MODULE_DEVICE_TABLE(input, apmpower_ids);
107 
108 static struct input_handler apmpower_handler = {
109 	.event =	apmpower_event,
110 	.connect =	apmpower_connect,
111 	.disconnect =	apmpower_disconnect,
112 	.name =		"apm-power",
113 	.id_table =	apmpower_ids,
114 };
115 
116 static int __init apmpower_init(void)
117 {
118 	return input_register_handler(&apmpower_handler);
119 }
120 
121 static void __exit apmpower_exit(void)
122 {
123 	input_unregister_handler(&apmpower_handler);
124 }
125 
126 module_init(apmpower_init);
127 module_exit(apmpower_exit);
128 
129 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
130 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
131 MODULE_LICENSE("GPL");
132