270 lines
6.6 KiB
C
270 lines
6.6 KiB
C
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/* $NetBSD: joy.c,v 1.1 1996/03/27 19:16:00 perry Exp $ */
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/*-
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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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* Ported to NetBSD by Matthieu Herrb <matthieu@laas.fr>
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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 <errno.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <machine/cpu.h>
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#include <machine/pio.h>
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#include <machine/cpufunc.h>
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#include <machine/joystick.h>
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#include <dev/isa/isavar.h>
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#include <dev/isa/isareg.h>
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#include <i386/isa/timerreg.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 JOYUNIT(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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#define JOY_NPORTS 1
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struct joy_softc {
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struct device sc_dev;
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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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};
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int joyprobe __P((struct device *, void *, void *));
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void joyattach __P((struct device *, struct device *, void *));
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int joyopen __P((dev_t, int, int, struct proc *));
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int joyclose __P((dev_t, int, int, struct proc *));
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static int get_tick __P((void));
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struct cfattach joy_ca = {
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sizeof(struct joy_softc), joyprobe, joyattach
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};
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struct cfdriver joy_cd = {
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NULL, "joy", DV_DULL
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};
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int
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joyprobe (parent, match, aux)
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struct device *parent;
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void *match, *aux;
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{
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struct isa_attach_args *ia = aux;
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int iobase = ia->ia_iobase;
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#ifdef WANT_JOYSTICK_CONNECTED
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outb (iobase, 0xff);
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DELAY (10000); /* 10 ms delay */
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return (inb (iobase) & 0x0f) != 0x0f;
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#else
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ia->ia_iosize = JOY_NPORTS;
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ia->ia_msize = 0;
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return 1;
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#endif
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}
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void
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joyattach (parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct joy_softc *sc = (void *)self;
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struct isa_attach_args *ia = aux;
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int unit = sc->sc_dev.dv_unit;
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int iobase = ia->ia_iobase;
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sc->port = iobase;
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sc->timeout[0] = sc->timeout[1] = 0;
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outb (iobase, 0xff);
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DELAY (10000); /* 10 ms delay */
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printf(": joystick%sconnected\n",
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(inb (iobase) & 0x0f) == 0x0f ? " not " : " ");
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}
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int
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joyopen (dev, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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int unit = JOYUNIT (dev);
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int i = joypart (dev);
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struct joy_softc *sc;
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if (unit >= joy_cd.cd_ndevs) {
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return(ENXIO);
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}
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sc = joy_cd.cd_devs[unit];
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if (sc->timeout[i]) {
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return EBUSY;
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}
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sc->x_off[i] = sc->y_off[i] = 0;
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sc->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, flag, mode, p)
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dev_t dev;
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int flag, mode;
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struct proc *p;
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{
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int unit = JOYUNIT (dev);
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int i = joypart (dev);
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struct joy_softc *sc = joy_cd.cd_devs[unit];
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sc->timeout[i] = 0;
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return 0;
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}
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int
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joyread(dev, uio, flag)
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dev_t dev;
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struct uio *uio;
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int flag;
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{
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int unit = JOYUNIT(dev);
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struct joy_softc *sc = joy_cd.cd_devs[unit];
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int port = sc->port;
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int i, t0, t1;
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int state = 0, x = 0, y = 0;
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struct joystick c;
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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(sc->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 -= TIMER_FREQ/hz;
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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.x = x ? sc->x_off[joypart(dev)] + ticks2usec(t0-x) : 0x80000000;
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c.y = y ? sc->y_off[joypart(dev)] + ticks2usec(t0-y) : 0x80000000;
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state >>= 4;
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c.b1 = ~state & 1;
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c.b2 = ~(state >> 1) & 1;
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return uiomove ((caddr_t)&c, sizeof(struct joystick), uio);
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}
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int
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joyioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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int unit = JOYUNIT (dev);
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int i = joypart (dev);
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struct joy_softc *sc = joy_cd.cd_devs[unit];
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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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sc->timeout[i] = x;
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break;
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case JOY_GETTIMEOUT:
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*(int *) data = sc->timeout[i];
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break;
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case JOY_SET_X_OFFSET:
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sc->x_off[i] = *(int *) data;
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break;
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case JOY_SET_Y_OFFSET:
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sc->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 = sc->x_off[i];
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break;
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case JOY_GET_Y_OFFSET:
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*(int *) data = sc->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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