joy.c revision 87384
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 * $FreeBSD: head/sys/dev/joy/joy.c 87384 2001-12-05 09:08:23Z imp $ 29 */ 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/conf.h> 34#include <sys/uio.h> 35#include <sys/kernel.h> 36#include <sys/module.h> 37#include <sys/bus.h> 38#include <machine/bus.h> 39#include <machine/resource.h> 40#include <sys/rman.h> 41#include <sys/time.h> 42#include <sys/joystick.h> 43#include <dev/joy/joyvar.h> 44 45/* The game port can manage 4 buttons and 4 variable resistors (usually 2 46 * joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201. 47 * Getting the state of the buttons is done by reading the game port: 48 * buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2) 49 * to bits 0-3. 50 * if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0 51 * to get the value of a resistor, write the value 0xff at port and 52 * wait until the corresponding bit returns to 0. 53 */ 54 55#define joypart(d) (minor(d)&1) 56#define UNIT(d) ((minor(d)>>1)&3) 57#ifndef JOY_TIMEOUT 58#define JOY_TIMEOUT 2000 /* 2 milliseconds */ 59#endif 60 61#define JOY_SOFTC(unit) (struct joy_softc *) \ 62 devclass_get_softc(joy_devclass,(unit)) 63 64#define CDEV_MAJOR 51 65static d_open_t joyopen; 66static d_close_t joyclose; 67static d_read_t joyread; 68static d_ioctl_t joyioctl; 69 70static struct cdevsw joy_cdevsw = { 71 /* open */ joyopen, 72 /* close */ joyclose, 73 /* read */ joyread, 74 /* write */ nowrite, 75 /* ioctl */ joyioctl, 76 /* poll */ nopoll, 77 /* mmap */ nommap, 78 /* strategy */ nostrategy, 79 /* name */ "joy", 80 /* maj */ CDEV_MAJOR, 81 /* dump */ nodump, 82 /* psize */ nopsize, 83 /* flags */ 0, 84}; 85 86devclass_t joy_devclass; 87 88int 89joy_probe(device_t dev) 90{ 91#ifdef WANT_JOYSTICK_CONNECTED 92#ifdef notyet 93 outb(dev->id_iobase, 0xff); 94 DELAY(10000); /* 10 ms delay */ 95 return (inb(dev->id_iobase) & 0x0f) != 0x0f; 96#else 97 return (0); 98#endif 99#else 100 return (0); 101#endif 102} 103 104int 105joy_attach(device_t dev) 106{ 107 int unit = device_get_unit(dev); 108 struct joy_softc *joy = device_get_softc(dev); 109 110 joy->rid = 0; 111 joy->res = bus_alloc_resource(dev, SYS_RES_IOPORT, &joy->rid, 0, ~0, 1, 112 RF_ACTIVE); 113 if (joy->res == NULL) 114 return ENXIO; 115 joy->bt = rman_get_bustag(joy->res); 116 joy->port = rman_get_bushandle(joy->res); 117 joy->timeout[0] = joy->timeout[1] = 0; 118 joy->d = make_dev(&joy_cdevsw, 0, 0, 0, 0600, "joy%d", unit); 119 return (0); 120} 121 122int 123joy_detach(device_t dev) 124{ 125 struct joy_softc *joy = device_get_softc(dev); 126 127 if (joy->res != NULL) 128 bus_release_resource(dev, SYS_RES_IOPORT, joy->rid, joy->res); 129 if (joy->d) 130 destroy_dev(joy->d); 131 return (0); 132} 133 134 135static int 136joyopen(dev_t dev, int flags, int fmt, struct thread *td) 137{ 138 int i = joypart (dev); 139 struct joy_softc *joy = JOY_SOFTC(UNIT(dev)); 140 141 if (joy->timeout[i]) 142 return (EBUSY); 143 joy->x_off[i] = joy->y_off[i] = 0; 144 joy->timeout[i] = JOY_TIMEOUT; 145 return (0); 146} 147 148static int 149joyclose(dev_t dev, int flags, int fmt, struct thread *td) 150{ 151 int i = joypart (dev); 152 struct joy_softc *joy = JOY_SOFTC(UNIT(dev)); 153 154 joy->timeout[i] = 0; 155 return (0); 156} 157 158static int 159joyread(dev_t dev, struct uio *uio, int flag) 160{ 161 struct joy_softc *joy = JOY_SOFTC(UNIT(dev)); 162 bus_space_handle_t port = joy->port; 163 bus_space_tag_t bt = joy->bt; 164 struct timespec t, start, end; 165 int state = 0; 166 struct timespec x, y; 167 struct joystick c; 168#ifndef i386 169 int s; 170 171 s = splhigh(); 172#else 173 disable_intr (); 174#endif 175 bus_space_write_1 (bt, port, 0, 0xff); 176 nanotime(&start); 177 end.tv_sec = 0; 178 end.tv_nsec = joy->timeout[joypart(dev)] * 1000; 179 timespecadd(&end, &start); 180 t = start; 181 timespecclear(&x); 182 timespecclear(&y); 183 while (timespeccmp(&t, &end, <)) { 184 state = bus_space_read_1 (bt, port, 0); 185 if (joypart(dev) == 1) 186 state >>= 2; 187 nanotime(&t); 188 if (!timespecisset(&x) && !(state & 0x01)) 189 x = t; 190 if (!timespecisset(&y) && !(state & 0x02)) 191 y = t; 192 if (timespecisset(&x) && timespecisset(&y)) 193 break; 194 } 195#ifndef i386 196 splx(s); 197#else 198 enable_intr (); 199#endif 200 if (timespecisset(&x)) { 201 timespecsub(&x, &start); 202 c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000; 203 } else 204 c.x = 0x80000000; 205 if (timespecisset(&y)) { 206 timespecsub(&y, &start); 207 c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000; 208 } else 209 c.y = 0x80000000; 210 state >>= 4; 211 c.b1 = ~state & 1; 212 c.b2 = ~(state >> 1) & 1; 213 return (uiomove((caddr_t)&c, sizeof(struct joystick), uio)); 214} 215 216static int 217joyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td) 218{ 219 struct joy_softc *joy = JOY_SOFTC(UNIT(dev)); 220 int i = joypart (dev); 221 int x; 222 223 switch (cmd) { 224 case JOY_SETTIMEOUT: 225 x = *(int *) data; 226 if (x < 1 || x > 10000) /* 10ms maximum! */ 227 return EINVAL; 228 joy->timeout[i] = x; 229 break; 230 case JOY_GETTIMEOUT: 231 *(int *) data = joy->timeout[i]; 232 break; 233 case JOY_SET_X_OFFSET: 234 joy->x_off[i] = *(int *) data; 235 break; 236 case JOY_SET_Y_OFFSET: 237 joy->y_off[i] = *(int *) data; 238 break; 239 case JOY_GET_X_OFFSET: 240 *(int *) data = joy->x_off[i]; 241 break; 242 case JOY_GET_Y_OFFSET: 243 *(int *) data = joy->y_off[i]; 244 break; 245 default: 246 return (ENOTTY); 247 } 248 return (0); 249} 250