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joydump.c

/*
 * $Id: joydump.c,v 1.1 2002/01/23 06:56:16 jsimmons Exp $
 *
 *  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 <vojtech@ucw.cz>, 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 <vojtech@ucw.cz>");
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,
};

static int __init joydump_init(void)
{
      gameport_register_driver(&joydump_drv);
      return 0;
}

static void __exit joydump_exit(void)
{
      gameport_unregister_driver(&joydump_drv);
}

module_init(joydump_init);
module_exit(joydump_exit);

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