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 #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:
  27                 apm_queue_event(APM_USER_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         {
  95                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
  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 <rpurdie@rpsys.net>");
 125 MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
 126 MODULE_LICENSE("GPL");