/*- * 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 #include #include #include #include #ifdef DEVFS #include #endif /*DEVFS*/ #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 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]; #ifdef DEVFS void *devfs_token; #endif } joy[NJOY]; extern int timer0_max_count; static int joyprobe (struct isa_device *); static int joyattach (struct isa_device *); struct isa_driver joydriver = {joyprobe, joyattach, "joy"}; #define CDEV_MAJOR 51 static d_open_t joyopen; static d_close_t joyclose; static d_read_t joyread; static d_ioctl_t joyioctl; static struct cdevsw joy_cdevsw = { joyopen, joyclose, joyread, nowrite, /*51*/ joyioctl, nostop, nullreset, nodevtotty,/*joystick */ seltrue, nommap, NULL, "joy", NULL, -1 }; static int get_tick (); static 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 } static int joyattach (struct isa_device *dev) { int unit = dev->id_unit; char name[32]; joy[unit].port = dev->id_iobase; joy[unit].timeout[0] = joy[unit].timeout[1] = 0; printf("joy%d: joystick\n", unit); #ifdef DEVFS sprintf(name, "joy%d", unit); joy[dev->id_unit].devfs_token = devfs_add_devsw( "/", "joy", &joy_cdevsw, 0, DV_CHR, 0, 0, 0600); #endif return 1; } static int joyopen (dev_t dev, int flags, int fmt, struct proc *p) { 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; } static int joyclose (dev_t dev, int flags, int fmt, struct proc *p) { int unit = UNIT (dev); int i = joypart (dev); joy[unit].timeout[i] = 0; return 0; } static 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); } static 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; } static joy_devsw_installed = 0; static void joy_drvinit(void *unused) { dev_t dev; if( ! joy_devsw_installed ) { dev = makedev(CDEV_MAJOR,0); cdevsw_add(&dev,&joy_cdevsw,NULL); joy_devsw_installed = 1; } } SYSINIT(joydev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,joy_drvinit,NULL) #endif /* NJOY > 0 */