input/linux_joystick.c

   1 /*
   2  * $Source: /cvs/cvsroot/d2x/input/linux_joystick.c,v $
   3  * $Revision: 1.4 $
   4  * $Author: bradleyb $
   5  * $Date: 2001-01-29 14:03:57 $
   6  *
   7  * Linux joystick support
   8  *
   9  * $Log: not supported by cvs2svn $
  10  */
  11
  12 #ifdef HAVE_CONFIG_H
  13 #include <conf.h>
  14 #endif
  15
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18 #include <linux/joystick.h>
  19 #include <sys/ioctl.h>
  20 #include <fcntl.h>
  21 #include <unistd.h>
  22
  23 #include "timer.h"
  24 #include "pstypes.h"
  25 #include "mono.h"
  26 #include "joy.h"
  27
  28 #include "linux_joystick.h"
  29
  30 char joy_installed = 0;
  31 char joy_present = 0;
  32
  33 joystick_device j_joystick[4];
  34 joystick_axis j_axis[MAX_AXES];
  35 joystick_button j_button[MAX_BUTTONS];
  36
  37 int j_num_axes = 0, j_num_buttons = 0;
  38 int timer_rate;
  39
  40 int j_axes_in_sticks[4];        /* number of axes in the first [x] sticks */
  41 int j_buttons_in_sticks[4];     /* number of buttons in the first [x] sticks */
  42
  43 int joy_deadzone = 0;
  44
  45 int j_Get_joydev_axis_number (int all_axis_number) {
  46         int i, joy_axis_number = all_axis_number;
  47
  48         for (i = 0; i < j_axis[all_axis_number].joydev; i++) {
  49                 joy_axis_number -= j_joystick[i].num_axes;
  50         }
  51
  52         return joy_axis_number;
  53 }
  54
  55
  56 int j_Get_joydev_button_number (int all_button_number) {
  57         int i, joy_button_number = all_button_number;
  58
  59         for (i = 0; i < j_button[all_button_number].joydev; i++) {
  60                 joy_button_number -= j_joystick[i].num_buttons;
  61         }
  62
  63         return joy_button_number;
  64 }
  65
  66
  67 int j_Update_state () {
  68         int num_processed = 0, i;
  69         struct js_event current_event;
  70         struct JS_DATA_TYPE joy_data;
  71
  72         for (i = 0; i < j_num_buttons; i++) {
  73                 //changed 6/24/1999 to finally squish the timedown bug - Owen Evans
  74                 if (j_button[i].state != j_button[i].last_state) {
  75                         if (j_button[i].state) {
  76                                 j_button[i].downcount++;
  77                                 j_button[i].timedown = timer_get_fixed_seconds();
  78                         }
  79                 }
  80                 //end changed - OE
  81                 j_button[i].last_state = j_button[i].state;
  82         }
  83
  84         for (i = 0; i < 4; i++) {
  85                 if (j_joystick[i].buffer >= 0) {
  86                         if (j_joystick[i].version) {
  87                                 while (read (j_joystick[i].buffer, &current_event, sizeof (struct js_event)) > 0) {
  88                                         num_processed++;
  89                                         switch (current_event.type & ~JS_EVENT_INIT) {
  90                                                 case JS_EVENT_AXIS:
  91                                                         j_axis[j_axes_in_sticks[i] + current_event.number].value = current_event.value;
  92                                                         break;
  93                                                 case JS_EVENT_BUTTON:
  94                                                         j_button[j_buttons_in_sticks[i] + current_event.number].state = current_event.value;
  95                                                         break;
  96                                         }
  97                                 }
  98                         } else {
  99                                 read (j_joystick[i].buffer, &joy_data, JS_RETURN);
 100                                 j_axis[j_axes_in_sticks[i] + 0].value = joy_data.x;
 101                                 j_axis[j_axes_in_sticks[i] + 1].value = joy_data.y;
 102                                 j_button[j_buttons_in_sticks[i] + 0].state = (joy_data.buttons & 0x01);
 103                                 j_button[j_buttons_in_sticks[i] + 1].state = (joy_data.buttons & 0x02) >> 1;
 104                         }
 105                 }
 106         }
 107
 108         return num_processed;
 109 }
 110
 111
 112 void joy_set_cal_vals(int *axis_min, int *axis_center, int *axis_max) {
 113         int i;
 114
 115         for (i = 0; i < 4; i++) {
 116                 j_axis[i].center_val = axis_center[i];
 117                 j_axis[i].min_val = axis_min[i];
 118                 j_axis[i].max_val = axis_max[i];
 119         }
 120 }
 121
 122
 123 void joy_get_cal_vals(int *axis_min, int *axis_center, int *axis_max) {
 124         int i;
 125
 126         //edited 05/18/99 Matt Mueller - we should return all axes instead of j_num_axes, since they are all given to us in joy_set_cal_vals ( and because checker complains :)
 127         for (i = 0; i < 4; i++) {
 128         //end edit -MM
 129                 axis_center[i] = j_axis[i].center_val;
 130                 axis_min[i] = j_axis[i].min_val;
 131                 axis_max[i] = j_axis[i].max_val;
 132         }
 133 }
 134
 135
 136 void joy_set_min (int axis_number, int value) {
 137         j_axis[axis_number].min_val = value;
 138 }
 139
 140
 141 void joy_set_center (int axis_number, int value) {
 142         j_axis[axis_number].center_val = value;
 143 }
 144
 145
 146 void joy_set_max (int axis_number, int value) {
 147         j_axis[axis_number].max_val = value;
 148 }
 149
 150
 151 ubyte joy_get_present_mask () {
 152         return 1;
 153 }
 154
 155
 156 void joy_set_timer_rate (int max_value) {
 157         timer_rate = max_value;
 158 }
 159
 160
 161 int joy_get_timer_rate () {
 162         return timer_rate;
 163 }
 164
 165
 166 void joy_flush () {
 167         int i;
 168
 169         if (!joy_installed) return;
 170
 171         for (i = 0; i < j_num_buttons; i++) {
 172                 j_button[i].timedown = 0;
 173                 j_button[i].downcount = 0;
 174         }
 175
 176 }
 177
 178
 179 ubyte joystick_read_raw_axis (ubyte mask, int *axes) {
 180         int i;
 181
 182         j_Update_state();
 183
 184         for (i = 0; i < j_num_axes; i++) {
 185                 axes[i] = j_axis[i].value;
 186         }
 187
 188         return 0;
 189 }
 190
 191
 192 /* joy_init () is pretty huge, a bit klunky, and by no means pretty.  But who cares?  It does the job and it's only run once. */
 193
 194
 195 int joy_init () {
 196         int i, j;
 197
 198         if (joy_installed) return 0;
 199         joy_flush ();
 200
 201         if (!joy_installed)     {
 202
 203                 printf ("Initializing joystick... ");
 204
 205                 j_joystick[0].buffer = open ("/dev/js0", O_NONBLOCK);
 206                 j_joystick[1].buffer = open ("/dev/js1", O_NONBLOCK);
 207                 j_joystick[2].buffer = open ("/dev/js2", O_NONBLOCK);
 208                 j_joystick[3].buffer = open ("/dev/js3", O_NONBLOCK);
 209
 210                 if (j_joystick[0].buffer >= 0 || j_joystick[1].buffer >= 0 || j_joystick[2].buffer >= 0 || j_joystick[3].buffer >= 0) {
 211                         printf ("found: ");
 212
 213                         for (i = 0; i < 4; i++) {
 214                                 if (j_joystick[i].buffer >= 0) {
 215                                         ioctl (j_joystick[i].buffer, JSIOCGAXES, &j_joystick[i].num_axes);
 216                                         ioctl (j_joystick[i].buffer, JSIOCGBUTTONS, &j_joystick[i].num_buttons);
 217                                         ioctl (j_joystick[i].buffer, JSIOCGVERSION, &j_joystick[i].version);
 218                                         if (!j_joystick[i].version) {
 219                                                 j_joystick[i].num_axes = 2;
 220                                                 j_joystick[i].num_buttons = 2;
 221                                                 printf ("js%d (v0.x)  " , i);
 222                                         } else {
 223                                                 printf ("js%d (v%d.%d.%d)  ",
 224                                                         i,
 225                                                         (j_joystick[i].version & 0xff0000) >> 16,
 226                                                         (j_joystick[i].version & 0xff00) >> 8,
 227                                                         j_joystick[i].version & 0xff);
 228                                         }
 229
 230                                         for (j = j_num_axes; j < (j_num_axes + j_joystick[i].num_axes); j++) {
 231                                                 j_axis[j].joydev = i;
 232                                                 if (j_joystick[i].version) {
 233                                                         j_axis[j].center_val = 0;
 234                                                         j_axis[j].max_val = 32767;
 235                                                         j_axis[j].min_val = -32767;
 236                                                 }
 237                                         }
 238                                         for (j = j_num_buttons; j < (j_num_buttons + j_joystick[i].num_buttons); j++) {
 239                                                 j_button[j].joydev = i;
 240                                         }
 241
 242                                         j_num_axes += j_joystick[i].num_axes;
 243                                         j_num_buttons += j_joystick[i].num_buttons;
 244
 245                                 } else {
 246                                         j_joystick[i].num_buttons = 0;
 247                                         j_joystick[i].num_axes = 0;
 248                                 }
 249
 250                                 for (j = 0; j < i; j++) {
 251                                         j_axes_in_sticks[i] += j_joystick[j].num_axes;
 252                                         j_buttons_in_sticks[i] += j_joystick[j].num_buttons;
 253                                 }
 254                         }
 255                 } else {
 256                         printf ("no joysticks found\n");
 257                         return 0;
 258                 }
 259
 260                 printf ("\n");
 261
 262                 if (j_num_axes > MAX_AXES)
 263                         j_num_axes = MAX_AXES;
 264                 if (j_num_buttons > MAX_BUTTONS)
 265                         j_num_buttons = MAX_BUTTONS;
 266
 267                 joy_present = 1;
 268                 joy_installed = 1;
 269                 return 1;
 270         }
 271
 272         return 1;
 273 }
 274
 275
 276 void joy_close() {
 277         int i;
 278
 279         if (!joy_installed) return;
 280
 281         for (i = 0; i < 4; i++) {
 282                 if (j_joystick[i].buffer>=0) {
 283                         printf ("closing js%d\n", i);
 284                         close (j_joystick[i].buffer);
 285                 }
 286                 j_joystick[i].buffer=-1;
 287         }
 288
 289         joy_present=0;
 290         joy_installed=0;
 291 }
 292
 293
 294 void joy_set_cen() {
 295 }
 296
 297
 298 int joy_get_scaled_reading(int raw, int axis_num)
 299 {
 300  int d, x;
 301
 302   raw -= j_axis[axis_num].center_val;
 303
 304    if (raw < 0)
 305     d = j_axis[axis_num].center_val - j_axis[axis_num].min_val;
 306    else if (raw > 0)
 307     d = j_axis[axis_num].max_val - j_axis[axis_num].center_val;
 308    else
 309     d = 0;
 310
 311    if (d)
 312     x = ((raw << 7) / d);
 313    else
 314     x = 0;
 315
 316    if ( x < -128 )
 317     x = -128;
 318    if ( x > 127 )
 319     x = 127;
 320
 321 //added on 4/13/99 by Victor Rachels to add deadzone control
 322   d =  (joy_deadzone) * 6;
 323    if ((x > (-1*d)) && (x < d))
 324     x = 0;
 325 //end this section addition -VR
 326
 327   return x;
 328 }
 329
 330
 331 void joy_get_pos(int *x, int *y) {
 332         int axis[MAX_AXES];
 333
 334         if ((!joy_installed)||(!joy_present)) { *x=*y=0; return; }
 335
 336         joystick_read_raw_axis (JOY_ALL_AXIS, axis);
 337
 338         *x = joy_get_scaled_reading( axis[0], 0 );
 339         *y = joy_get_scaled_reading( axis[1], 1 );
 340 }
 341
 342
 343 int joy_get_btns () {
 344         return 0;
 345 }
 346
 347
 348 int joy_get_button_state (int btn) {
 349   if(btn >= j_num_buttons)
 350    return 0;
 351         j_Update_state ();
 352
 353         return j_button[btn].state;
 354 }
 355
 356
 357 int joy_get_button_down_cnt (int btn) {
 358         int downcount;
 359
 360         j_Update_state ();
 361
 362         downcount = j_button[btn].downcount;
 363         j_button[btn].downcount = 0;
 364
 365         return downcount;
 366 }
 367
 368
 369 //changed 6/24/99 to finally squish the timedown bug - Owen Evans
 370 fix joy_get_button_down_time(int btn)  {
 371         fix downtime;
 372         j_Update_state ();
 373
 374         if (j_button[btn].state) {
 375                 downtime = timer_get_fixed_seconds() - j_button[btn].timedown;
 376                 j_button[btn].timedown = timer_get_fixed_seconds();
 377         } else {
 378                 downtime = 0;
 379         }
 380
 381         return downtime;
 382 }
 383 //end changed - OE
 384
 385 void joy_poll() {
 386
 387 }
 388
 389
 390 void joy_set_slow_reading(int flag) {
 391
 392 }