Input: add input event to APM event bridge
[linux-2.6.git] / drivers / input / apm-power.c
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");