apm-power.c

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/*
 *  Input Power Event -> APM Bridge
 *
 *  Copyright (c) 2007 Richard Purdie
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/apm-emulation.h>

static void system_power_event(unsigned int keycode)
{
    switch (keycode) {
    case KEY_SUSPEND:
        apm_queue_event(APM_USER_SUSPEND);
        pr_info("Requesting system suspend...\n");
        break;
    default:
        break;
    }
}

static void apmpower_event(struct input_handle *handle, unsigned int type,
               unsigned int code, int value)
{
    /* only react on key down events */
    if (value != 1)
        return;

    switch (type) {
    case EV_PWR:
        system_power_event(code);
        break;

    default:
        break;
    }
}

static int apmpower_connect(struct input_handler *handler,
                      struct input_dev *dev,
                      const struct input_device_id *id)
{
    struct input_handle *handle;
    int error;

    handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
    if (!handle)
        return -ENOMEM;

    handle->dev = dev;
    handle->handler = handler;
    handle->name = "apm-power";

    error = input_register_handle(handle);
    if (error) {
        pr_err("Failed to register input power handler, error %d\n",
               error);
        kfree(handle);
        return error;
    }

    error = input_open_device(handle);
    if (error) {
        pr_err("Failed to open input power device, error %d\n", error);
        input_unregister_handle(handle);
        kfree(handle);
        return error;
    }

    return 0;
}

static void apmpower_disconnect(struct input_handle *handle)
{
    input_close_device(handle);
    input_unregister_handle(handle);
    kfree(handle);
}

static const struct input_device_id apmpower_ids[] = {
    {
        .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
        .evbit = { BIT_MASK(EV_PWR) },
    },
    { },
};

MODULE_DEVICE_TABLE(input, apmpower_ids);

static struct input_handler apmpower_handler = {
    .event =    apmpower_event,
    .connect =  apmpower_connect,
    .disconnect =   apmpower_disconnect,
    .name =     "apm-power",
    .id_table = apmpower_ids,
};

static int __init apmpower_init(void)
{
    return input_register_handler(&apmpower_handler);
}

static void __exit apmpower_exit(void)
{
    input_unregister_handler(&apmpower_handler);
}

module_init(apmpower_init);
module_exit(apmpower_exit);

MODULE_AUTHOR("Richard Purdie <[email protected]>");
MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
MODULE_LICENSE("GPL");