linux/drivers/input/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
  23static 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
  35static 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
  52static 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
  86static void apmpower_disconnect(struct input_handle *handle)
  87{
  88        input_close_device(handle);
  89        input_unregister_handle(handle);
  90        kfree(handle);
  91}
  92
  93static 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
 101MODULE_DEVICE_TABLE(input, apmpower_ids);
 102
 103static 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
 111static int __init apmpower_init(void)
 112{
 113        return input_register_handler(&apmpower_handler);
 114}
 115
 116static void __exit apmpower_exit(void)
 117{
 118        input_unregister_handler(&apmpower_handler);
 119}
 120
 121module_init(apmpower_init);
 122module_exit(apmpower_exit);
 123
 124MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 125MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
 126MODULE_LICENSE("GPL");
 127
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