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/*

 * $Id: gameport.c,v 1.1.1.1 2004-04-15 02:03:30 phoenix Exp $

 *

 *  Copyright (c) 1999-2000 Vojtech Pavlik

 *

 *  Sponsored by SuSE

 */

/*

 * Generic gameport layer

 */

/*

 * 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@suse.cz>, or by paper mail:

 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic

 */

#include <asm/io.h>

#include <linux/module.h>

#include <linux/ioport.h>

#include <linux/init.h>

#include <linux/gameport.h>

#include <linux/slab.h>

#include <linux/isapnp.h>

#include <linux/stddef.h>

#include <linux/delay.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");

MODULE_LICENSE("GPL");

EXPORT_SYMBOL(gameport_register_port);

EXPORT_SYMBOL(gameport_unregister_port);

EXPORT_SYMBOL(gameport_register_device);

EXPORT_SYMBOL(gameport_unregister_device);

EXPORT_SYMBOL(gameport_open);

EXPORT_SYMBOL(gameport_close);

EXPORT_SYMBOL(gameport_rescan);

EXPORT_SYMBOL(gameport_cooked_read);

static struct gameport *gameport_list;

static struct gameport_dev *gameport_dev;

static int gameport_number;

/*

 * gameport_measure_speed() measures the gameport i/o speed.

 */

static int gameport_measure_speed(struct gameport *gameport)

{

#if defined(__i386__) || defined(__x86_64__)

#define GET_TIME(x)     do { outb(0, 0x43); x = inb(0x40); x |= inb(0x40) << 8; } while (0)

#define DELTA(x,y)      ((y)-(x)+((y)<(x)?1193180L/HZ:0))

        unsigned int i, t, t1, t2, t3, tx;

        unsigned long flags;

        if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW))

                return 0;

        tx = 1 << 30;

        for(i = 0; i < 50; i++) {

                save_flags(flags);      /* Yes, all CPUs */

                cli();

                GET_TIME(t1);

                for(t = 0; t < 50; t++) gameport_read(gameport);

                GET_TIME(t2);

                GET_TIME(t3);

                restore_flags(flags);

                udelay(i * 10);

                if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t;

        }

        return 59659 / (tx < 1 ? 1 : tx);

#else

        unsigned int j, t = 0;

        j = jiffies; while (j == jiffies);

        j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); }

        return t * HZ / 1000;

#endif

        gameport_close(gameport);

}

static void gameport_find_dev(struct gameport *gameport)

{

        struct gameport_dev *dev = gameport_dev;

        while (dev && !gameport->dev) {

                if (dev->connect)

                        dev->connect(gameport, dev);

                dev = dev->next;

        }

}

void gameport_rescan(struct gameport *gameport)

{

        gameport_close(gameport);

        gameport_find_dev(gameport);

}

void gameport_register_port(struct gameport *gameport)

{

        gameport->number = gameport_number++;

        gameport->next = gameport_list;

        gameport_list = gameport;

        gameport->speed = gameport_measure_speed(gameport);

        gameport_find_dev(gameport);

}

void gameport_unregister_port(struct gameport *gameport)

{

        struct gameport **gameportptr = &gameport_list;

        while (*gameportptr && (*gameportptr != gameport)) gameportptr = &((*gameportptr)->next);

        *gameportptr = (*gameportptr)->next;

        if (gameport->dev && gameport->dev->disconnect)

                gameport->dev->disconnect(gameport);

        gameport_number--;

}

void gameport_register_device(struct gameport_dev *dev)

{

        struct gameport *gameport = gameport_list;

        dev->next = gameport_dev;

        gameport_dev = dev;

        while (gameport) {

                if (!gameport->dev && dev->connect)

                        dev->connect(gameport, dev);

                gameport = gameport->next;

        }

}

void gameport_unregister_device(struct gameport_dev *dev)

{

        struct gameport_dev **devptr = &gameport_dev;

        struct gameport *gameport = gameport_list;

        while (*devptr && (*devptr != dev)) devptr = &((*devptr)->next);

        *devptr = (*devptr)->next;

        while (gameport) {

                if (gameport->dev == dev && dev->disconnect)

                        dev->disconnect(gameport);

                gameport_find_dev(gameport);

                gameport = gameport->next;

        }

}

int gameport_open(struct gameport *gameport, struct gameport_dev *dev, int mode)

{

        if (gameport->open) {

                if (gameport->open(gameport, mode))

                        return -1;

        } else {

                if (mode != GAMEPORT_MODE_RAW)

                        return -1;

        }

        if (gameport->dev)

                return -1;

        gameport->dev = dev;

        return 0;

}

void gameport_close(struct gameport *gameport)

{

        gameport->dev = NULL;

        if (gameport->close) gameport->close(gameport);

}