arch/linux/joystick.c

   1 /* $Id: joystick.c,v 1.5 2004-05-22 07:31:38 btb Exp $ */
   2 /*
   3  *
   4  * Linux joystick support
   5  *
   6  */
   7
   8 #ifdef HAVE_CONFIG_H
   9 #include <conf.h>
  10 #endif
  11
  12 #include <stdlib.h>
  13 #include <stdio.h>
  14 #include <linux/joystick.h>
  15 #include <sys/ioctl.h>
  16 #include <fcntl.h>
  17 #include <unistd.h>
  18
  19 #include "timer.h"
  20 #include "pstypes.h"
  21 #include "mono.h"
  22 #include "joy.h"
  23
  24 #include "joystick.h"
  25
  26 char joy_installed = 0;
  27 char joy_present = 0;
  28
  29 joystick_device j_joystick[MAX_JOY_DEVS];
  30 joystick_axis j_axis[MAX_AXES];
  31 joystick_button j_button[MAX_BUTTONS];
  32
  33 int j_num_axes = 0, j_num_buttons = 0;
  34 int timer_rate;
  35
  36 int j_axes_in_sticks[MAX_JOY_DEVS];     /* number of axes in the first [x] sticks */
  37 int j_buttons_in_sticks[MAX_JOY_DEVS];  /* number of buttons in the first [x] sticks */
  38
  39 int joy_deadzone = 0;
  40
  41 int j_Get_joydev_axis_number (int all_axis_number) {
  42         int i, joy_axis_number = all_axis_number;
  43
  44         for (i = 0; i < j_axis[all_axis_number].joydev; i++) {
  45                 joy_axis_number -= j_joystick[i].num_axes;
  46         }
  47
  48         return joy_axis_number;
  49 }
  50
  51
  52 int j_Get_joydev_button_number (int all_button_number) {
  53         int i, joy_button_number = all_button_number;
  54
  55         for (i = 0; i < j_button[all_button_number].joydev; i++) {
  56                 joy_button_number -= j_joystick[i].num_buttons;
  57         }
  58
  59         return joy_button_number;
  60 }
  61
  62
  63 int j_Update_state () {
  64         int num_processed = 0, i;
  65         struct js_event current_event;
  66         struct JS_DATA_TYPE joy_data;
  67
  68         for (i = 0; i < j_num_buttons; i++) {
  69                 //changed 6/24/1999 to finally squish the timedown bug - Owen Evans
  70                 if (j_button[i].state != j_button[i].last_state) {
  71                         if (j_button[i].state) {
  72                                 j_button[i].downcount++;
  73                                 j_button[i].timedown = timer_get_fixed_seconds();
  74                         }
  75                 }
  76                 //end changed - OE
  77                 j_button[i].last_state = j_button[i].state;
  78         }
  79
  80         for (i = 0; i < MAX_JOY_DEVS; i++)
  81         {
  82                 if (j_joystick[i].buffer >= 0) {
  83                         if (j_joystick[i].version) {
  84                                 while (read (j_joystick[i].buffer, &current_event, sizeof (struct js_event)) > 0) {
  85                                         num_processed++;
  86                                         switch (current_event.type & ~JS_EVENT_INIT) {
  87                                                 case JS_EVENT_AXIS:
  88                                                         j_axis[j_axes_in_sticks[i] + current_event.number].value = current_event.value;
  89                                                         break;
  90                                                 case JS_EVENT_BUTTON:
  91                                                         j_button[j_buttons_in_sticks[i] + current_event.number].state = current_event.value;
  92                                                         break;
  93                                         }
  94                                 }
  95                         } else {
  96                                 read (j_joystick[i].buffer, &joy_data, JS_RETURN);
  97                                 j_axis[j_axes_in_sticks[i] + 0].value = joy_data.x;
  98                                 j_axis[j_axes_in_sticks[i] + 1].value = joy_data.y;
  99                                 j_button[j_buttons_in_sticks[i] + 0].state = (joy_data.buttons & 0x01);
 100                                 j_button[j_buttons_in_sticks[i] + 1].state = (joy_data.buttons & 0x02) >> 1;
 101                         }
 102                 }
 103         }
 104
 105         return num_processed;
 106 }
 107
 108
 109 void joy_set_cal_vals(int *axis_min, int *axis_center, int *axis_max)
 110 {
 111 /* stpohle - this is already done in the "joy_init" function, so we don't need it in here.
 112         int i;
 113
 114         for (i = 0; i < JOY_NUM_AXES; i++)
 115         {
 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
 124
 125 void joy_get_cal_vals(int *axis_min, int *axis_center, int *axis_max) {
 126         int i;
 127
 128         //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 :)
 129         for (i = 0; i < JOY_NUM_AXES; i++)
 130         {
 131         //end edit -MM
 132                 axis_center[i] = j_axis[i].center_val;
 133                 axis_min[i] = j_axis[i].min_val;
 134                 axis_max[i] = j_axis[i].max_val;
 135         }
 136 }
 137
 138
 139 void joy_set_min (int axis_number, int value) {
 140         j_axis[axis_number].min_val = value;
 141 }
 142
 143
 144 void joy_set_center (int axis_number, int value) {
 145         j_axis[axis_number].center_val = value;
 146 }
 147
 148
 149 void joy_set_max (int axis_number, int value) {
 150         j_axis[axis_number].max_val = value;
 151 }
 152
 153
 154 ubyte joy_get_present_mask () {
 155         return 1;
 156 }
 157
 158
 159 void joy_set_timer_rate (int max_value) {
 160         timer_rate = max_value;
 161 }
 162
 163
 164 int joy_get_timer_rate () {
 165         return timer_rate;
 166 }
 167
 168
 169 void joy_flush () {
 170         int i;
 171
 172         if (!joy_installed) return;
 173
 174         for (i = 0; i < j_num_buttons; i++) {
 175                 j_button[i].timedown = 0;
 176                 j_button[i].downcount = 0;
 177         }
 178
 179 }
 180
 181
 182 ubyte joystick_read_raw_axis (ubyte mask, int *axes) {
 183         int i;
 184
 185         if (!joy_installed)
 186                 return 0;
 187         j_Update_state();
 188
 189         for (i = 0; i < j_num_axes; i++) {
 190                 axes[i] = j_axis[i].value;
 191         }
 192
 193         return 0;
 194 }
 195
 196
 197 /* 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. */
 198
 199
 200 int joy_init () {
 201         int i, j;
 202         int joystick_found;
 203
 204         if (joy_installed) return 0;
 205         joy_flush ();
 206
 207         if (!joy_installed)     {
 208
 209                 printf ("Initializing joystick... ");
 210
 211                 j_joystick[0].buffer = open ("/dev/js0", O_NONBLOCK);
 212                 j_joystick[1].buffer = open ("/dev/js1", O_NONBLOCK);
 213                 j_joystick[2].buffer = open ("/dev/js2", O_NONBLOCK);
 214                 j_joystick[3].buffer = open ("/dev/js3", O_NONBLOCK);
 215                 j_joystick[0].buffer = open("/dev/input/js0", O_NONBLOCK);
 216                 j_joystick[1].buffer = open("/dev/input/js1", O_NONBLOCK);
 217                 j_joystick[2].buffer = open("/dev/input/js2", O_NONBLOCK);
 218                 j_joystick[3].buffer = open("/dev/input/js3", O_NONBLOCK);
 219
 220                 // Determine whether any sticks were found
 221                 joystick_found = 0;
 222                 for (i = 0; i < MAX_JOY_DEVS; i++)
 223                 {
 224                         if (j_joystick[i].buffer >= 0)
 225                         {
 226                                 joystick_found = 1;
 227                                 break;
 228                         }
 229                 }
 230                 if (joystick_found)
 231                 {
 232                         printf ("found: ");
 233
 234                         for (i = 0; i < MAX_JOY_DEVS; i++)
 235                         {
 236                                 if (j_joystick[i].buffer >= 0) {
 237                                         ioctl (j_joystick[i].buffer, JSIOCGAXES, &j_joystick[i].num_axes);
 238                                         ioctl (j_joystick[i].buffer, JSIOCGBUTTONS, &j_joystick[i].num_buttons);
 239                                         ioctl (j_joystick[i].buffer, JSIOCGVERSION, &j_joystick[i].version);
 240                                         if (!j_joystick[i].version) {
 241                                                 j_joystick[i].num_axes = 2;
 242                                                 j_joystick[i].num_buttons = 2;
 243                                                 printf ("js%d (v0.x)  " , i);
 244                                         } else {
 245                                                 printf ("js%d (v%d.%d.%d)  ",
 246                                                         i,
 247                                                         (j_joystick[i].version & 0xff0000) >> 16,
 248                                                         (j_joystick[i].version & 0xff00) >> 8,
 249                                                         j_joystick[i].version & 0xff);
 250                                         }
 251
 252                                         for (j = j_num_axes; j < (j_num_axes + j_joystick[i].num_axes); j++) {
 253                                                 j_axis[j].joydev = i;
 254                                                 if (j_joystick[i].version) {
 255                                                         j_axis[j].center_val = 0;
 256                                                         j_axis[j].max_val = 32767;
 257                                                         j_axis[j].min_val = -32767;
 258                                                 }
 259                                         }
 260                                         for (j = j_num_buttons; j < (j_num_buttons + j_joystick[i].num_buttons); j++) {
 261                                                 j_button[j].joydev = i;
 262                                         }
 263
 264                                         j_num_axes += j_joystick[i].num_axes;
 265                                         j_num_buttons += j_joystick[i].num_buttons;
 266
 267                                 } else {
 268                                         j_joystick[i].num_buttons = 0;
 269                                         j_joystick[i].num_axes = 0;
 270                                 }
 271
 272                                 for (j = 0; j < i; j++) {
 273                                         j_axes_in_sticks[i] += j_joystick[j].num_axes;
 274                                         j_buttons_in_sticks[i] += j_joystick[j].num_buttons;
 275                                 }
 276                         }
 277                 } else {
 278                         printf ("no joysticks found\n");
 279                         return 0;
 280                 }
 281
 282                 printf ("\n");
 283
 284                 if (j_num_axes > MAX_AXES)
 285                         j_num_axes = MAX_AXES;
 286                 if (j_num_buttons > MAX_BUTTONS)
 287                         j_num_buttons = MAX_BUTTONS;
 288
 289                 joy_present = 1;
 290                 joy_installed = 1;
 291                 return 1;
 292         }
 293
 294         return 1;
 295 }
 296
 297
 298 void joy_close() {
 299         int i;
 300
 301         if (!joy_installed) return;
 302
 303         for (i = 0; i < MAX_JOY_DEVS; i++)
 304         {
 305                 if (j_joystick[i].buffer>=0) {
 306                         printf ("closing js%d\n", i);
 307                         close (j_joystick[i].buffer);
 308                 }
 309                 j_joystick[i].buffer=-1;
 310         }
 311
 312         joy_present=0;
 313         joy_installed=0;
 314 }
 315
 316
 317 void joy_set_cen() {
 318 }
 319
 320
 321 int joy_get_scaled_reading(int raw, int axis_num)
 322 {
 323  int d, x;
 324
 325   raw -= j_axis[axis_num].center_val;
 326
 327    if (raw < 0)
 328     d = j_axis[axis_num].center_val - j_axis[axis_num].min_val;
 329    else if (raw > 0)
 330     d = j_axis[axis_num].max_val - j_axis[axis_num].center_val;
 331    else
 332     d = 0;
 333
 334    if (d)
 335     x = ((raw << 7) / d);
 336    else
 337     x = 0;
 338
 339    if ( x < -128 )
 340     x = -128;
 341    if ( x > 127 )
 342     x = 127;
 343
 344 //added on 4/13/99 by Victor Rachels to add deadzone control
 345   d =  (joy_deadzone) * 6;
 346    if ((x > (-1*d)) && (x < d))
 347     x = 0;
 348 //end this section addition -VR
 349
 350   return x;
 351 }
 352
 353
 354 void joy_get_pos(int *x, int *y) {
 355         int axis[MAX_AXES];
 356
 357         if ((!joy_installed)||(!joy_present)) { *x=*y=0; return; }
 358
 359         joystick_read_raw_axis (JOY_ALL_AXIS, axis);
 360
 361         *x = joy_get_scaled_reading( axis[0], 0 );
 362         *y = joy_get_scaled_reading( axis[1], 1 );
 363 }
 364
 365
 366 int joy_get_btns () {
 367         return 0;
 368 }
 369
 370
 371 int joy_get_button_state (int btn) {
 372         if (!joy_installed)
 373                 return 0;
 374   if(btn >= j_num_buttons)
 375    return 0;
 376         j_Update_state ();
 377
 378         return j_button[btn].state;
 379 }
 380
 381
 382 int joy_get_button_down_cnt (int btn) {
 383         int downcount;
 384
 385         if (!joy_installed)
 386                 return 0;
 387         j_Update_state ();
 388
 389         downcount = j_button[btn].downcount;
 390         j_button[btn].downcount = 0;
 391
 392         return downcount;
 393 }
 394
 395
 396 //changed 6/24/99 to finally squish the timedown bug - Owen Evans
 397 fix joy_get_button_down_time(int btn)  {
 398         fix downtime;
 399
 400         if (!joy_installed)
 401                 return 0;
 402         j_Update_state ();
 403
 404         if (j_button[btn].state) {
 405                 downtime = timer_get_fixed_seconds() - j_button[btn].timedown;
 406                 j_button[btn].timedown = timer_get_fixed_seconds();
 407         } else {
 408                 downtime = 0;
 409         }
 410
 411         return downtime;
 412 }
 413 //end changed - OE
 414
 415 void joy_poll() {
 416
 417 }
 418
 419
 420 void joy_set_slow_reading(int flag) {
 421
 422 }