Linux Kernel  3.7.1
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apm-power.c
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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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 
14 #include <linux/module.h>
15 #include <linux/input.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/tty.h>
19 #include <linux/delay.h>
20 #include <linux/pm.h>
21 #include <linux/apm-emulation.h>
22 
23 static void system_power_event(unsigned int keycode)
24 {
25  switch (keycode) {
26  case KEY_SUSPEND:
28  pr_info("Requesting system suspend...\n");
29  break;
30  default:
31  break;
32  }
33 }
34 
35 static void apmpower_event(struct input_handle *handle, unsigned int type,
36  unsigned int code, int value)
37 {
38  /* only react on key down events */
39  if (value != 1)
40  return;
41 
42  switch (type) {
43  case EV_PWR:
44  system_power_event(code);
45  break;
46 
47  default:
48  break;
49  }
50 }
51 
52 static int apmpower_connect(struct input_handler *handler,
53  struct input_dev *dev,
54  const struct input_device_id *id)
55 {
56  struct input_handle *handle;
57  int error;
58 
59  handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
60  if (!handle)
61  return -ENOMEM;
62 
63  handle->dev = dev;
64  handle->handler = handler;
65  handle->name = "apm-power";
66 
67  error = input_register_handle(handle);
68  if (error) {
69  pr_err("Failed to register input power handler, error %d\n",
70  error);
71  kfree(handle);
72  return error;
73  }
74 
75  error = input_open_device(handle);
76  if (error) {
77  pr_err("Failed to open input power device, error %d\n", error);
78  input_unregister_handle(handle);
79  kfree(handle);
80  return error;
81  }
82 
83  return 0;
84 }
85 
86 static void apmpower_disconnect(struct input_handle *handle)
87 {
88  input_close_device(handle);
89  input_unregister_handle(handle);
90  kfree(handle);
91 }
92 
93 static const struct input_device_id apmpower_ids[] = {
94  {
96  .evbit = { BIT_MASK(EV_PWR) },
97  },
98  { },
99 };
100 
101 MODULE_DEVICE_TABLE(input, apmpower_ids);
102 
103 static struct input_handler apmpower_handler = {
104  .event = apmpower_event,
105  .connect = apmpower_connect,
106  .disconnect = apmpower_disconnect,
107  .name = "apm-power",
108  .id_table = apmpower_ids,
109 };
110 
111 static int __init apmpower_init(void)
112 {
113  return input_register_handler(&apmpower_handler);
114 }
115 
116 static void __exit apmpower_exit(void)
117 {
118  input_unregister_handler(&apmpower_handler);
119 }
120 
121 module_init(apmpower_init);
122 module_exit(apmpower_exit);
123 
124 MODULE_AUTHOR("Richard Purdie <[email protected]>");
125 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
126 MODULE_LICENSE("GPL");