1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1995 Jean-Marc Zucconi 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer 12 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/conf.h> 38 #include <sys/uio.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/bus.h> 42 #include <machine/bus.h> 43 #include <machine/resource.h> 44 #include <sys/rman.h> 45 #include <sys/time.h> 46 #include <sys/joystick.h> 47 #include <dev/joy/joyvar.h> 48 49 /* The game port can manage 4 buttons and 4 variable resistors (usually 2 50 * joysticks, each with 2 buttons and 2 pots.) via the port at address 0x201. 51 * Getting the state of the buttons is done by reading the game port: 52 * buttons 1-4 correspond to bits 4-7 and resistors 1-4 (X1, Y1, X2, Y2) 53 * to bits 0-3. 54 * if button 1 (resp 2, 3, 4) is pressed, the bit 4 (resp 5, 6, 7) is set to 0 55 * to get the value of a resistor, write the value 0xff at port and 56 * wait until the corresponding bit returns to 0. 57 */ 58 59 #define joypart(d) (dev2unit(d)&1) 60 #ifndef JOY_TIMEOUT 61 #define JOY_TIMEOUT 2000 /* 2 milliseconds */ 62 #endif 63 64 static d_open_t joyopen; 65 static d_close_t joyclose; 66 static d_read_t joyread; 67 static d_ioctl_t joyioctl; 68 69 static struct cdevsw joy_cdevsw = { 70 .d_version = D_VERSION, 71 .d_flags = D_NEEDGIANT, 72 .d_open = joyopen, 73 .d_close = joyclose, 74 .d_read = joyread, 75 .d_ioctl = joyioctl, 76 .d_name = "joy", 77 }; 78 79 devclass_t joy_devclass; 80 81 int 82 joy_probe(device_t dev) 83 { 84 #ifdef WANT_JOYSTICK_CONNECTED 85 #ifdef notyet 86 outb(dev->id_iobase, 0xff); 87 DELAY(10000); /* 10 ms delay */ 88 return (inb(dev->id_iobase) & 0x0f) != 0x0f; 89 #else 90 return (0); 91 #endif 92 #else 93 return (0); 94 #endif 95 } 96 97 int 98 joy_attach(device_t dev) 99 { 100 int unit = device_get_unit(dev); 101 struct joy_softc *joy = device_get_softc(dev); 102 103 joy->rid = 0; 104 joy->res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &joy->rid, 105 RF_ACTIVE|RF_SHAREABLE); 106 if (joy->res == NULL) 107 return ENXIO; 108 joy->bt = rman_get_bustag(joy->res); 109 joy->port = rman_get_bushandle(joy->res); 110 joy->timeout[0] = joy->timeout[1] = 0; 111 joy->d = make_dev(&joy_cdevsw, unit, 0, 0, 0600, "joy%d", unit); 112 joy->d->si_drv1 = joy; 113 return (0); 114 } 115 116 int 117 joy_detach(device_t dev) 118 { 119 struct joy_softc *joy = device_get_softc(dev); 120 121 if (joy->res != NULL) 122 bus_release_resource(dev, SYS_RES_IOPORT, joy->rid, joy->res); 123 if (joy->d) 124 destroy_dev(joy->d); 125 return (0); 126 } 127 128 129 static int 130 joyopen(struct cdev *dev, int flags, int fmt, struct thread *td) 131 { 132 int i = joypart (dev); 133 struct joy_softc *joy = dev->si_drv1; 134 135 if (joy->timeout[i]) 136 return (EBUSY); 137 joy->x_off[i] = joy->y_off[i] = 0; 138 joy->timeout[i] = JOY_TIMEOUT; 139 return (0); 140 } 141 142 static int 143 joyclose(struct cdev *dev, int flags, int fmt, struct thread *td) 144 { 145 int i = joypart (dev); 146 struct joy_softc *joy = dev->si_drv1; 147 148 joy->timeout[i] = 0; 149 return (0); 150 } 151 152 static int 153 joyread(struct cdev *dev, struct uio *uio, int flag) 154 { 155 struct joy_softc *joy = dev->si_drv1; 156 bus_space_handle_t port = joy->port; 157 bus_space_tag_t bt = joy->bt; 158 struct timespec t, start, end; 159 int state = 0; 160 struct timespec x, y; 161 struct joystick c; 162 #ifndef __i386__ 163 int s; 164 165 s = splhigh(); 166 #else 167 disable_intr (); 168 #endif 169 nanotime(&t); 170 end.tv_sec = 0; 171 end.tv_nsec = joy->timeout[joypart(dev)] * 1000; 172 timespecadd(&end, &t); 173 for (; timespeccmp(&t, &end, <) && (bus_space_read_1(bt, port, 0) & 0x0f); nanotime(&t)) 174 ; /* nothing */ 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 } 215 216 static int 217 joyioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td) 218 { 219 struct joy_softc *joy = dev->si_drv1; 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