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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 "joy.h"
#if NJOY > 0
#include <errno.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <machine/joystick.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.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 UNIT(d) minor(d)>>1&3
#ifndef JOY_TIMEOUT
#define JOY_TIMEOUT 2000 /* 2 milliseconds */
#endif
static struct {
int port;
int x_off[2], y_off[2];
int timeout[2];
} joy[NJOY];
extern int timer0_max_count;
int joyprobe (struct isa_device *), joyattach (struct isa_device *);
struct isa_driver joydriver = {joyprobe, joyattach, "joy"};
static int get_tick ();
int
joyprobe (struct isa_device *dev)
{
#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
}
int
joyattach (struct isa_device *dev)
{
joy[dev->id_unit].port = dev->id_iobase;
joy[dev->id_unit].timeout[0] = joy[dev->id_unit].timeout[1] = 0;
printf("joy%d: joystick\n", dev->id_unit);
return 1;
}
int
joyopen (dev_t dev, int flag)
{
int unit = UNIT (dev);
int i = joypart (dev);
if (joy[unit].timeout[i])
return EBUSY;
joy[unit].x_off[i] = joy[unit].y_off[i] = 0;
joy[unit].timeout[i] = JOY_TIMEOUT;
return 0;
}
int
joyclose (dev_t dev, int flag)
{
int unit = UNIT (dev);
int i = joypart (dev);
joy[unit].timeout[i] = 0;
return 0;
}
int
joyread (dev_t dev, struct uio *uio, int flag)
{
int unit = UNIT(dev);
int port = joy[unit].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(joy[unit].timeout[joypart(dev)]);
while (t0-t1 < i) {
state = inb (port);
if (joypart(dev) == 1)
state >>= 2;
t1 = get_tick ();
if (t1 > t0)
t1 -= timer0_max_count;
if (!x && !(state & 0x01))
x = t1;
if (!y && !(state & 0x02))
y = t1;
if (x && y)
break;
}
enable_intr ();
c.x = x ? joy[unit].x_off[joypart(dev)] + ticks2usec(t0-x) : 0x80000000;
c.y = y ? joy[unit].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_t dev, int cmd, caddr_t data, int flag, struct proc *p)
{
int unit = UNIT (dev);
int i = joypart (dev);
int x;
switch (cmd) {
case JOY_SETTIMEOUT:
x = *(int *) data;
if (x < 1 || x > 10000) /* 10ms maximum! */
return EINVAL;
joy[unit].timeout[i] = x;
break;
case JOY_GETTIMEOUT:
*(int *) data = joy[unit].timeout[i];
break;
case JOY_SET_X_OFFSET:
joy[unit].x_off[i] = *(int *) data;
break;
case JOY_SET_Y_OFFSET:
joy[unit].y_off[i] = *(int *) data;
break;
case JOY_GET_X_OFFSET:
*(int *) data = joy[unit].x_off[i];
break;
case JOY_GET_Y_OFFSET:
*(int *) data = joy[unit].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;
}
#endif /* NJOY > 0 */
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