/*- * 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 #include #include #include #include #include #include #include #include #include #include #include /* 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; }