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/*
* $Id: gameport.c,v 1.5 2000/05/29 10:54:53 vojtech 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>");
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)
{
#ifdef __i386__
#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);
}
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