joy.c revision 127135
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 without 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 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD: head/sys/dev/joy/joy.c 127135 2004-03-17 17:50:55Z njl $"); 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/conf.h> 36#include <sys/uio.h> 37#include <sys/kernel.h> 38#include <sys/module.h> 39#include <sys/bus.h> 40#include <machine/bus.h> 41#include <machine/resource.h> 42#include <sys/rman.h> 43#include <sys/time.h> 44#include <sys/joystick.h> 45#include <dev/joy/joyvar.h> 46 47/* The game port can manage 4 buttons and 4 variable resistors (usually 2 48 * joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201. 49 * Getting the state of the buttons is done by reading the game port: 50 * buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2) 51 * to bits 0-3. 52 * if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0 53 * to get the value of a resistor, write the value 0xff at port and 54 * wait until the corresponding bit returns to 0. 55 */ 56 57#define joypart(d) (minor(d)&1) 58#define UNIT(d) ((minor(d)>>1)&3) 59#ifndef JOY_TIMEOUT 60#define JOY_TIMEOUT 2000 /* 2 milliseconds */ 61#endif 62 63#define JOY_SOFTC(unit) (struct joy_softc *) \ 64 devclass_get_softc(joy_devclass,(unit)) 65 66static d_open_t joyopen; 67static d_close_t joyclose; 68static d_read_t joyread; 69static d_ioctl_t joyioctl; 70 71static struct cdevsw joy_cdevsw = { 72 .d_version = D_VERSION, 73 .d_flags = D_NEEDGIANT, 74 .d_open = joyopen, 75 .d_close = joyclose, 76 .d_read = joyread, 77 .d_ioctl = joyioctl, 78 .d_name = "joy", 79}; 80 81devclass_t joy_devclass; 82 83int 84joy_probe(device_t dev) 85{ 86#ifdef WANT_JOYSTICK_CONNECTED 87#ifdef notyet 88 outb(dev->id_iobase, 0xff); 89 DELAY(10000); /* 10 ms delay */ 90 return (inb(dev->id_iobase) & 0x0f) != 0x0f; 91#else 92 return (0); 93#endif 94#else 95 return (0); 96#endif 97} 98 99int 100joy_attach(device_t dev) 101{ 102 int unit = device_get_unit(dev); 103 struct joy_softc *joy = device_get_softc(dev); 104 105 joy->rid = 0; 106 joy->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &joy->rid, 107 RF_ACTIVE); 108 if (joy->res == NULL) 109 return ENXIO; 110 joy->bt = rman_get_bustag(joy->res); 111 joy->port = rman_get_bushandle(joy->res); 112 joy->timeout[0] = joy->timeout[1] = 0; 113 joy->d = make_dev(&joy_cdevsw, 0, 0, 0, 0600, "joy%d", unit); 114 return (0); 115} 116 117int 118joy_detach(device_t dev) 119{ 120 struct joy_softc *joy = device_get_softc(dev); 121 122 if (joy->res != NULL) 123 bus_release_resource(dev, SYS_RES_IOPORT, joy->rid, joy->res); 124 if (joy->d) 125 destroy_dev(joy->d); 126 return (0); 127} 128 129 130static int 131joyopen(dev_t dev, int flags, int fmt, struct thread *td) 132{ 133 int i = joypart (dev); 134 struct joy_softc *joy = JOY_SOFTC(UNIT(dev)); 135 136 if (joy->timeout[i]) 137 return (EBUSY); 138 joy->x_off[i] = joy->y_off[i] = 0; 139 joy->timeout[i] = JOY_TIMEOUT; 140 return (0); 141} 142 143static int 144joyclose(dev_t dev, int flags, int fmt, struct thread *td) 145{ 146 int i = joypart (dev); 147 struct joy_softc *joy = JOY_SOFTC(UNIT(dev)); 148 149 joy->timeout[i] = 0; 150 return (0); 151} 152 153static int 154joyread(dev_t dev, struct uio *uio, int flag) 155{ 156 struct joy_softc *joy = JOY_SOFTC(UNIT(dev)); 157 bus_space_handle_t port = joy->port; 158 bus_space_tag_t bt = joy->bt; 159 struct timespec t, start, end; 160 int state = 0; 161 struct timespec x, y; 162 struct joystick c; 163#ifndef __i386__ 164 int s; 165 166 s = splhigh(); 167#else 168 disable_intr (); 169#endif 170 bus_space_write_1 (bt, port, 0, 0xff); 171 nanotime(&start); 172 end.tv_sec = 0; 173 end.tv_nsec = joy->timeout[joypart(dev)] * 1000; 174 timespecadd(&end, &start); 175 t = start; 176 timespecclear(&x); 177 timespecclear(&y); 178 while (timespeccmp(&t, &end, <)) { 179 state = bus_space_read_1 (bt, port, 0); 180 if (joypart(dev) == 1) 181 state >>= 2; 182 nanotime(&t); 183 if (!timespecisset(&x) && !(state & 0x01)) 184 x = t; 185 if (!timespecisset(&y) && !(state & 0x02)) 186 y = t; 187 if (timespecisset(&x) && timespecisset(&y)) 188 break; 189 } 190#ifndef __i386__ 191 splx(s); 192#else 193 enable_intr (); 194#endif 195 if (timespecisset(&x)) { 196 timespecsub(&x, &start); 197 c.x = joy->x_off[joypart(dev)] + x.tv_nsec / 1000; 198 } else 199 c.x = 0x80000000; 200 if (timespecisset(&y)) { 201 timespecsub(&y, &start); 202 c.y = joy->y_off[joypart(dev)] + y.tv_nsec / 1000; 203 } else 204 c.y = 0x80000000; 205 state >>= 4; 206 c.b1 = ~state & 1; 207 c.b2 = ~(state >> 1) & 1; 208 return (uiomove((caddr_t)&c, sizeof(struct joystick), uio)); 209} 210 211static int 212joyioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct thread *td) 213{ 214 struct joy_softc *joy = JOY_SOFTC(UNIT(dev)); 215 int i = joypart (dev); 216 int x; 217 218 switch (cmd) { 219 case JOY_SETTIMEOUT: 220 x = *(int *) data; 221 if (x < 1 || x > 10000) /* 10ms maximum! */ 222 return EINVAL; 223 joy->timeout[i] = x; 224 break; 225 case JOY_GETTIMEOUT: 226 *(int *) data = joy->timeout[i]; 227 break; 228 case JOY_SET_X_OFFSET: 229 joy->x_off[i] = *(int *) data; 230 break; 231 case JOY_SET_Y_OFFSET: 232 joy->y_off[i] = *(int *) data; 233 break; 234 case JOY_GET_X_OFFSET: 235 *(int *) data = joy->x_off[i]; 236 break; 237 case JOY_GET_Y_OFFSET: 238 *(int *) data = joy->y_off[i]; 239 break; 240 default: 241 return (ENOTTY); 242 } 243 return (0); 244} 245