joydump.c

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/*
 *  Copyright (c) 1996-2001 Vojtech Pavlik
 */

/*
 * This is just a very simple driver that can dump the data
 * out of the joystick port into the 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
 */

#include <linux/module.h>
#include <linux/gameport.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>

#define DRIVER_DESC "Gameport data dumper module"

MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

#define BUF_SIZE 256

struct joydump {
    unsigned int time;
    unsigned char data;
};

static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
{
    struct joydump *buf;    /* all entries */
    struct joydump *dump, *prev;    /* one entry each */
    int axes[4], buttons;
    int i, j, t, timeout;
    unsigned long flags;
    unsigned char u;

    printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
    printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
    printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);

    if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {

        printk(KERN_INFO "joydump: | Raw mode not available - trying cooked.    |\n");

        if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {

            printk(KERN_INFO "joydump: | Cooked not available either. Failing.   |\n");
            printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
            return -ENODEV;
        }

        gameport_cooked_read(gameport, axes, &buttons);

        for (i = 0; i < 4; i++)
            printk(KERN_INFO "joydump: | Axis %d: %4d.                           |\n", i, axes[i]);
        printk(KERN_INFO "joydump: | Buttons %02x.                             |\n", buttons);
        printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
    }

    timeout = gameport_time(gameport, 10000); /* 10 ms */

    buf = kmalloc(BUF_SIZE * sizeof(struct joydump), GFP_KERNEL);
    if (!buf) {
        printk(KERN_INFO "joydump: no memory for testing\n");
        goto jd_end;
    }
    dump = buf;
    t = 0;
    i = 1;

    local_irq_save(flags);

    u = gameport_read(gameport);

    dump->data = u;
    dump->time = t;
    dump++;

    gameport_trigger(gameport);

    while (i < BUF_SIZE && t < timeout) {

        dump->data = gameport_read(gameport);

        if (dump->data ^ u) {
            u = dump->data;
            dump->time = t;
            i++;
            dump++;
        }
        t++;
    }

    local_irq_restore(flags);

/*
 * Dump data.
 */

    t = i;
    dump = buf;
    prev = dump;

    printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
    printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
    for (j = 7; j >= 0; j--)
        printk("%d", (dump->data >> j) & 1);
    printk(" |\n");
    dump++;

    for (i = 1; i < t; i++, dump++, prev++) {
        printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
            i, dump->time - prev->time);
        for (j = 7; j >= 0; j--)
            printk("%d", (dump->data >> j) & 1);
        printk(" |\n");
    }
    kfree(buf);

jd_end:
    printk(KERN_INFO "joydump: `------------------- END -----------------'\n");

    return 0;
}

static void joydump_disconnect(struct gameport *gameport)
{
    gameport_close(gameport);
}

static struct gameport_driver joydump_drv = {
    .driver     = {
        .name   = "joydump",
    },
    .description    = DRIVER_DESC,
    .connect    = joydump_connect,
    .disconnect = joydump_disconnect,
};

module_gameport_driver(joydump_drv);