joy.c revision 7430
1/*- 2 * Copyright (c) 1995 Jean-Marc Zucconi 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software withough specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 */ 29#include "joy.h" 30 31#if NJOY > 0 32 33#include <errno.h> 34 35#include <sys/param.h> 36#include <sys/systm.h> 37 38#include <machine/joystick.h> 39 40#include <i386/isa/isa.h> 41#include <i386/isa/isa_device.h> 42#include <i386/isa/timerreg.h> 43 44/* The game port can manage 4 buttons and 4 variable resistors (usually 2 45 * joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201. 46 * Getting the state of the buttons is done by reading the game port: 47 * buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2) 48 * to bits 0-3. 49 * if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0 50 * to get the value of a resistor, write the value 0xff at port and 51 * wait until the corresponding bit returns to 0. 52 */ 53 54 55/* the formulae below only work if u is ``not too large''. See also 56 * the discussion in microtime.s */ 57#define usec2ticks(u) (((u) * 19549)>>14) 58#define ticks2usec(u) (((u) * 3433)>>12) 59 60 61#define joypart(d) minor(d)&1 62#define UNIT(d) minor(d)>>1&3 63#ifndef JOY_TIMEOUT 64#define JOY_TIMEOUT 2000 /* 2 milliseconds */ 65#endif 66 67static struct { 68 int port; 69 int x_off[2], y_off[2]; 70 int timeout[2]; 71} joy[NJOY]; 72 73 74extern int timer0_max_count; 75 76int joyprobe (struct isa_device *), joyattach (struct isa_device *); 77 78struct isa_driver joydriver = {joyprobe, joyattach, "joy"}; 79 80static int get_tick (); 81 82 83int 84joyprobe (struct isa_device *dev) 85{ 86#ifdef WANT_JOYSTICK_CONNECTED 87 outb (dev->id_iobase, 0xff); 88 DELAY (10000); /* 10 ms delay */ 89 return (inb (dev->id_iobase) & 0x0f) != 0x0f; 90#else 91 return 1; 92#endif 93} 94 95int 96joyattach (struct isa_device *dev) 97{ 98 joy[dev->id_unit].port = dev->id_iobase; 99 joy[dev->id_unit].timeout[0] = joy[dev->id_unit].timeout[1] = 0; 100 printf("joy%d: joystick\n", dev->id_unit); 101 102 return 1; 103} 104 105int 106joyopen (dev_t dev, int flag) 107{ 108 int unit = UNIT (dev); 109 int i = joypart (dev); 110 111 if (joy[unit].timeout[i]) 112 return EBUSY; 113 joy[unit].x_off[i] = joy[unit].y_off[i] = 0; 114 joy[unit].timeout[i] = JOY_TIMEOUT; 115 return 0; 116} 117int 118joyclose (dev_t dev, int flag) 119{ 120 int unit = UNIT (dev); 121 int i = joypart (dev); 122 123 joy[unit].timeout[i] = 0; 124 return 0; 125} 126 127int 128joyread (dev_t dev, struct uio *uio, int flag) 129{ 130 int unit = UNIT(dev); 131 int port = joy[unit].port; 132 int i, t0, t1; 133 int state = 0, x = 0, y = 0; 134 struct joystick c; 135 136 disable_intr (); 137 outb (port, 0xff); 138 t0 = get_tick (); 139 t1 = t0; 140 i = usec2ticks(joy[unit].timeout[joypart(dev)]); 141 while (t0-t1 < i) { 142 state = inb (port); 143 if (joypart(dev) == 1) 144 state >>= 2; 145 t1 = get_tick (); 146 if (t1 > t0) 147 t1 -= timer0_max_count; 148 if (!x && !(state & 0x01)) 149 x = t1; 150 if (!y && !(state & 0x02)) 151 y = t1; 152 if (x && y) 153 break; 154 } 155 enable_intr (); 156 c.x = x ? joy[unit].x_off[joypart(dev)] + ticks2usec(t0-x) : 0x80000000; 157 c.y = y ? joy[unit].y_off[joypart(dev)] + ticks2usec(t0-y) : 0x80000000; 158 state >>= 4; 159 c.b1 = ~state & 1; 160 c.b2 = ~(state >> 1) & 1; 161 return uiomove ((caddr_t)&c, sizeof(struct joystick), uio); 162} 163int joyioctl (dev_t dev, int cmd, caddr_t data, int flag, struct proc *p) 164{ 165 int unit = UNIT (dev); 166 int i = joypart (dev); 167 int x; 168 169 switch (cmd) { 170 case JOY_SETTIMEOUT: 171 x = *(int *) data; 172 if (x < 1 || x > 10000) /* 10ms maximum! */ 173 return EINVAL; 174 joy[unit].timeout[i] = x; 175 break; 176 case JOY_GETTIMEOUT: 177 *(int *) data = joy[unit].timeout[i]; 178 break; 179 case JOY_SET_X_OFFSET: 180 joy[unit].x_off[i] = *(int *) data; 181 break; 182 case JOY_SET_Y_OFFSET: 183 joy[unit].y_off[i] = *(int *) data; 184 break; 185 case JOY_GET_X_OFFSET: 186 *(int *) data = joy[unit].x_off[i]; 187 break; 188 case JOY_GET_Y_OFFSET: 189 *(int *) data = joy[unit].y_off[i]; 190 break; 191 default: 192 return ENXIO; 193 } 194 return 0; 195} 196static int 197get_tick () 198{ 199 int low, high; 200 201 outb (TIMER_MODE, TIMER_SEL0); 202 low = inb (TIMER_CNTR0); 203 high = inb (TIMER_CNTR0); 204 205 return (high << 8) | low; 206} 207 208#endif /* NJOY > 0 */ 209