LXR linux/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
  21static 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
  34static 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
  51static 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        error = input_register_handle(handle);
  67        if (error) {
  68                printk(KERN_ERR
  69                        "apm-power: Failed to register input power handler, "
  70                        "error %d\n", error);
  71                kfree(handle);
  72                return error;
  73        }
  74
  75        error = input_open_device(handle);
  76        if (error) {
  77                printk(KERN_ERR
  78                        "apm-power: Failed to open input power device, "
  79                        "error %d\n", error);
  80                input_unregister_handle(handle);
  81                kfree(handle);
  82                return error;
  83        }
  84
  85        return 0;
  86}
  87
  88static void apmpower_disconnect(struct input_handle *handle)
  89{
  90        input_close_device(handle);
  91        input_unregister_handle(handle);
  92        kfree(handle);
  93}
  94
  95static const struct input_device_id apmpower_ids[] = {
  96        {
  97                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
  98                .evbit = { BIT_MASK(EV_PWR) },
  99        },
 100        { },
 101};
 102
 103MODULE_DEVICE_TABLE(input, apmpower_ids);
 104
 105static struct input_handler apmpower_handler = {
 106        .event =        apmpower_event,
 107        .connect =      apmpower_connect,
 108        .disconnect =   apmpower_disconnect,
 109        .name =         "apm-power",
 110        .id_table =     apmpower_ids,
 111};
 112
 113static int __init apmpower_init(void)
 114{
 115        return input_register_handler(&apmpower_handler);
 116}
 117
 118static void __exit apmpower_exit(void)
 119{
 120        input_unregister_handler(&apmpower_handler);
 121}
 122
 123module_init(apmpower_init);
 124module_exit(apmpower_exit);
 125
 126MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 127MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
 128MODULE_LICENSE("GPL");
 129