NetBSD/sys/arch/i386/isa/joy.c

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/* $NetBSD: joy.c,v 1.5 1996/10/13 03:20:00 christos Exp $ */
/*-
* Copyright (c) 1995 Jean-Marc Zucconi
* All rights reserved.
*
* Ported to NetBSD by Matthieu Herrb <matthieu@laas.fr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
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#include <sys/errno.h>
#include <machine/cpu.h>
#include <machine/pio.h>
#include <machine/cpufunc.h>
#include <machine/joystick.h>
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#include <machine/conf.h>
#include <dev/isa/isavar.h>
#include <dev/isa/isareg.h>
#include <i386/isa/timerreg.h>
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/*
* The game port can manage 4 buttons and 4 variable resistors (usually 2
* joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201.
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* Getting the state of the buttons is done by reading the game port;
* buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2)
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* to bits 0-3. If button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5,
* 6, 7) is set to 0 to get the value of a resistor, write the value 0xff
* at port and wait until the corresponding bit returns to 0.
*/
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/*
* The formulae below only work if u is ``not too large''. See also
* the discussion in microtime.s
*/
#define USEC2TICKS(u) (((u) * 19549) >> 14)
#define TICKS2USEC(u) (((u) * 3433) >> 12)
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#define JOYPART(d) (minor(d) & 1)
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#define JOYUNIT(d) minor(d) >> 1 & 3
#ifndef JOY_TIMEOUT
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#define JOY_TIMEOUT 2000 /* 2 milliseconds */
#endif
#define JOY_NPORTS 1
struct joy_softc {
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struct device sc_dev;
int port;
int x_off[2], y_off[2];
int timeout[2];
};
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int joyprobe __P((struct device *, void *, void *));
void joyattach __P((struct device *, struct device *, void *));
int joyopen __P((dev_t, int, int, struct proc *));
int joyclose __P((dev_t, int, int, struct proc *));
static int get_tick __P((void));
struct cfattach joy_ca = {
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sizeof(struct joy_softc), joyprobe, joyattach
};
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struct cfdriver joy_cd = {
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NULL, "joy", DV_DULL
};
int
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joyprobe(parent, match, aux)
struct device *parent;
void *match, *aux;
{
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struct isa_attach_args *ia = aux;
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#ifdef WANT_JOYSTICK_CONNECTED
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int iobase = ia->ia_iobase;
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outb(iobase, 0xff);
DELAY(10000); /* 10 ms delay */
return (inb(iobase) & 0x0f) != 0x0f;
#else
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ia->ia_iosize = JOY_NPORTS;
ia->ia_msize = 0;
return 1;
#endif
}
void
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joyattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
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struct joy_softc *sc = (void *) self;
struct isa_attach_args *ia = aux;
int iobase = ia->ia_iobase;
sc->port = iobase;
sc->timeout[0] = sc->timeout[1] = 0;
outb(iobase, 0xff);
DELAY(10000); /* 10 ms delay */
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printf(": joystick%sconnected\n",
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(inb(iobase) & 0x0f) == 0x0f ? " not " : " ");
}
int
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joyopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
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int unit = JOYUNIT(dev);
int i = JOYPART(dev);
struct joy_softc *sc;
if (unit >= joy_cd.cd_ndevs)
return (ENXIO);
sc = joy_cd.cd_devs[unit];
if (sc->timeout[i])
return EBUSY;
sc->x_off[i] = sc->y_off[i] = 0;
sc->timeout[i] = JOY_TIMEOUT;
return 0;
}
int
joyclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
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int unit = JOYUNIT(dev);
int i = JOYPART(dev);
struct joy_softc *sc = joy_cd.cd_devs[unit];
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sc->timeout[i] = 0;
return 0;
}
int
joyread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
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int unit = JOYUNIT(dev);
struct joy_softc *sc = joy_cd.cd_devs[unit];
struct joystick c;
int port = sc->port;
int i, t0, t1;
int state = 0, x = 0, y = 0;
disable_intr();
outb(port, 0xff);
t0 = get_tick();
t1 = t0;
i = USEC2TICKS(sc->timeout[JOYPART(dev)]);
while (t0 - t1 < i) {
state = inb(port);
if (JOYPART(dev) == 1)
state >>= 2;
t1 = get_tick();
if (t1 > t0)
t1 -= TIMER_FREQ / hz;
if (!x && !(state & 0x01))
x = t1;
if (!y && !(state & 0x02))
y = t1;
if (x && y)
break;
}
enable_intr();
c.x = x ? sc->x_off[JOYPART(dev)] + TICKS2USEC(t0 - x) : 0x80000000;
c.y = y ? sc->y_off[JOYPART(dev)] + TICKS2USEC(t0 - y) : 0x80000000;
state >>= 4;
c.b1 = ~state & 1;
c.b2 = ~(state >> 1) & 1;
return uiomove((caddr_t) & c, sizeof(struct joystick), uio);
}
int
joyioctl(dev, cmd, data, flag, p)
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dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
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int unit = JOYUNIT(dev);
struct joy_softc *sc = joy_cd.cd_devs[unit];
int i = JOYPART(dev);
int x;
switch (cmd) {
case JOY_SETTIMEOUT:
x = *(int *) data;
if (x < 1 || x > 10000) /* 10ms maximum! */
return EINVAL;
sc->timeout[i] = x;
break;
case JOY_GETTIMEOUT:
*(int *) data = sc->timeout[i];
break;
case JOY_SET_X_OFFSET:
sc->x_off[i] = *(int *) data;
break;
case JOY_SET_Y_OFFSET:
sc->y_off[i] = *(int *) data;
break;
case JOY_GET_X_OFFSET:
*(int *) data = sc->x_off[i];
break;
case JOY_GET_Y_OFFSET:
*(int *) data = sc->y_off[i];
break;
default:
return ENXIO;
}
return 0;
}
static int
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get_tick()
{
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int low, high;
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outb(TIMER_MODE, TIMER_SEL0);
low = inb(TIMER_CNTR0);
high = inb(TIMER_CNTR0);
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return (high << 8) | low;
}