207 lines
5.3 KiB
C
207 lines
5.3 KiB
C
/*-
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* Copyright (c) 1995 Jean-Marc Zucconi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software withough specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include "joy.h"
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#if NJOY > 0
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#include <errno.h>
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#include <sys/types.h>
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#include <i386/isa/isa.h>
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#include <i386/isa/timerreg.h>
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#include <i386/isa/isa_device.h>
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#include <machine/cpufunc.h>
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#include <i386/include/joystick.h>
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/* The game port can manage 4 buttons and 4 variable resistors (usually 2
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* 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:
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* buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2)
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* to bits 0-3.
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* if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0
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* to get the value of a resistor, write the value 0xff at port and
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* wait until the corresponding bit returns to 0.
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*/
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/* the formulae below only work if u is ``not too large''. See also
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* the discussion in microtime.s */
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#define usec2ticks(u) (((u) * 19549)>>14)
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#define ticks2usec(u) (((u) * 3433)>>12)
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#define joypart(d) minor(d)&1
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#define UNIT(d) minor(d)>>1&3
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#ifndef JOY_TIMEOUT
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#define JOY_TIMEOUT 2000 /* 2 milliseconds */
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#endif
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static struct {
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int port;
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int x_off[2], y_off[2];
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int timeout[2];
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} joy[NJOY];
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extern int timer0_max_count;
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int joyprobe (struct isa_device *), joyattach (struct isa_device *);
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struct isa_driver joydriver = {joyprobe, joyattach, "joy"};
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static int get_tick ();
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int
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joyprobe (struct isa_device *dev)
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{
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#ifdef WANT_JOYSTICK_CONNECTED
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outb (dev->id_iobase, 0xff);
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DELAY (10000); /* 10 ms delay */
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return (inb (dev->id_iobase) & 0x0f) != 0x0f;
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#else
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return 1;
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#endif
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}
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int
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joyattach (struct isa_device *dev)
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{
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joy[dev->id_unit].port = dev->id_iobase;
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joy[dev->id_unit].timeout[0] = joy[dev->id_unit].timeout[1] = 0;
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printf("joy%d: joystick\n", dev->id_unit);
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return 1;
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}
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int
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joyopen (dev_t dev, int flag)
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{
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int unit = UNIT (dev);
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int i = joypart (dev);
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if (joy[unit].timeout[i])
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return EBUSY;
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joy[unit].x_off[i] = joy[unit].y_off[i] = 0;
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joy[unit].timeout[i] = JOY_TIMEOUT;
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return 0;
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}
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int
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joyclose (dev_t dev, int flag)
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{
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int unit = UNIT (dev);
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int i = joypart (dev);
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joy[unit].timeout[i] = 0;
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return 0;
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}
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int
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joyread (dev_t dev, struct uio *uio, int flag)
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{
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int unit = UNIT(dev);
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int port = joy[unit].port;
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int i, t0, t1;
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int state = 0, x = 0, y = 0;
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int c[4];
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disable_intr ();
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outb (port, 0xff);
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t0 = get_tick ();
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t1 = t0;
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i = usec2ticks(joy[unit].timeout[joypart(dev)]);
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while (t0-t1 < i) {
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state = inb (port);
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if (joypart(dev) == 1)
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state >>= 2;
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t1 = get_tick ();
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if (t1 > t0)
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t1 -= timer0_max_count;
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if (!x && !(state & 0x01))
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x = t1;
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if (!y && !(state & 0x02))
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y = t1;
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if (x && y)
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break;
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}
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enable_intr ();
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c[0] = x ? joy[unit].x_off[joypart(dev)] + ticks2usec(t0-x) : 0x80000000;
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c[1] = y ? joy[unit].y_off[joypart(dev)] + ticks2usec(t0-y) : 0x80000000;
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state >>= 4;
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c[2] = ~state & 1;
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c[3] = ~(state >> 1) & 1;
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return uiomove (c, 4*sizeof(int), uio);
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}
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int joyioctl (dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
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{
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int unit = UNIT (dev);
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int i = joypart (dev);
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int x;
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switch (cmd) {
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case JOY_SETTIMEOUT:
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x = *(int *) data;
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if (x < 1 || x > 10000) /* 10ms maximum! */
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return EINVAL;
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joy[unit].timeout[i] = x;
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break;
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case JOY_GETTIMEOUT:
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*(int *) data = joy[unit].timeout[i];
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break;
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case JOY_SET_X_OFFSET:
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joy[unit].x_off[i] = *(int *) data;
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break;
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case JOY_SET_Y_OFFSET:
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joy[unit].y_off[i] = *(int *) data;
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break;
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case JOY_GET_X_OFFSET:
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*(int *) data = joy[unit].x_off[i];
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break;
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case JOY_GET_Y_OFFSET:
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*(int *) data = joy[unit].y_off[i];
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break;
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default:
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return ENXIO;
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}
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return 0;
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}
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static int
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get_tick ()
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{
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int low, high;
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outb (TIMER_MODE, TIMER_SEL0);
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low = inb (TIMER_CNTR0);
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high = inb (TIMER_CNTR0);
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return (high << 8) | low;
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}
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#endif /* NJOY > 0 */
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