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/*-
* Copyright (c) 1995 Jean-Marc Zucconi
* All rights reserved.
*
* 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 <errno.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <machine/cpu.h>
#include <machine/pio.h>
#include <machine/cpufunc.h>
#include <machine/joystick.h>
#include <dev/isa/isavar.h>
#include <dev/isa/isareg.h>
#include <i386/isa/timerreg.h>
/* 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.
* 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)
* 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.
*/
/* 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)
#define joypart(d) minor(d)&1
#define JOYUNIT(d) minor(d)>>1&3
#ifndef JOY_TIMEOUT
#define JOY_TIMEOUT 2000 /* 2 milliseconds */
#endif
struct joy_softc {
struct device sc_dev;
int port;
int x_off[2], y_off[2];
int timeout[2];
};
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 cfdriver joycd = {
NULL, "joy", joyprobe, joyattach, DV_DULL, sizeof(struct joy_softc)
};
int
joyprobe(parent, match, aux)
struct device *parent;
void *match, *aux;
{
#ifdef WANT_JOYSTICK_CONNECTED
outb(dev->id_iobase, 0xff);
DELAY(10000); /* 10 ms delay */
return (inb(dev->id_iobase) & 0x0f) != 0x0f;
#else
return 1;
#endif
}
void
joyattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct joy_softc *sc = (void *) self;
struct isa_attach_args *ia = aux;
int unit = sc->sc_dev.dv_unit;
sc->port = ia->ia_iobase;
sc->timeout[0] = sc->timeout[1] = 0;
printf(": joystick\n", unit);
}
int
joyopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
int unit = JOYUNIT(dev);
int i = joypart(dev);
struct joy_softc *sc;
if (unit >= joycd.cd_ndevs) {
return (ENXIO);
}
sc = joycd.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;
{
int unit = JOYUNIT(dev);
int i = joypart(dev);
struct joy_softc *sc = joycd.cd_devs[unit];
sc->timeout[i] = 0;
return 0;
}
int
joyread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit = JOYUNIT(dev);
struct joy_softc *sc = joycd.cd_devs[unit];
int port = sc->port;
int i, t0, t1;
int state = 0, x = 0, y = 0;
struct joystick c;
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)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
int unit = JOYUNIT(dev);
int i = joypart(dev);
struct joy_softc *sc = joycd.cd_devs[unit];
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
get_tick()
{
int low, high;
outb(TIMER_MODE, TIMER_SEL0);
low = inb(TIMER_CNTR0);
high = inb(TIMER_CNTR0);
return (high << 8) | low;
}
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