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");