evbug.c

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/*
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 */

/*
 *  Input driver event debug module - dumps all events into syslog
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <[email protected]>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/device.h>

MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
MODULE_DESCRIPTION("Input driver event debug module");
MODULE_LICENSE("GPL");

static void evbug_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
{
    printk(KERN_DEBUG pr_fmt("Event. Dev: %s, Type: %d, Code: %d, Value: %d\n"),
           dev_name(&handle->dev->dev), type, code, value);
}

static int evbug_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 = "evbug";

    error = input_register_handle(handle);
    if (error)
        goto err_free_handle;

    error = input_open_device(handle);
    if (error)
        goto err_unregister_handle;

    printk(KERN_DEBUG pr_fmt("Connected device: %s (%s at %s)\n"),
           dev_name(&dev->dev),
           dev->name ?: "unknown",
           dev->phys ?: "unknown");

    return 0;

 err_unregister_handle:
    input_unregister_handle(handle);
 err_free_handle:
    kfree(handle);
    return error;
}

static void evbug_disconnect(struct input_handle *handle)
{
    printk(KERN_DEBUG pr_fmt("Disconnected device: %s\n"),
           dev_name(&handle->dev->dev));

    input_close_device(handle);
    input_unregister_handle(handle);
    kfree(handle);
}

static const struct input_device_id evbug_ids[] = {
    { .driver_info = 1 },   /* Matches all devices */
    { },            /* Terminating zero entry */
};

MODULE_DEVICE_TABLE(input, evbug_ids);

static struct input_handler evbug_handler = {
    .event =    evbug_event,
    .connect =  evbug_connect,
    .disconnect =   evbug_disconnect,
    .name =     "evbug",
    .id_table = evbug_ids,
};

static int __init evbug_init(void)
{
    return input_register_handler(&evbug_handler);
}

static void __exit evbug_exit(void)
{
    input_unregister_handler(&evbug_handler);
}

module_init(evbug_init);
module_exit(evbug_exit);