Mercurial > sdl-ios-xcode
annotate src/joystick/linux/SDL_sysjoystick.c @ 232:678e3ed01019
Don't generate a spurious error on SDL_InitVideo()
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 06 Nov 2001 00:15:04 +0000 |
| parents | 50620ec9c86a |
| children | ab781a7dd82f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
| 4 | |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
| 20 slouken@devolution.com | |
| 21 */ | |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* This is the system specific header for the SDL joystick API */ | |
| 29 | |
| 30 #include <stdio.h> /* For the definition of NULL */ | |
| 31 #include <stdlib.h> /* For getenv() prototype */ | |
| 32 #include <string.h> | |
| 33 #include <sys/stat.h> | |
| 34 #include <unistd.h> | |
| 35 #include <fcntl.h> | |
| 36 #include <sys/ioctl.h> | |
| 37 #include <limits.h> /* For the definition of PATH_MAX */ | |
| 38 | |
| 39 #include <linux/joystick.h> | |
| 40 #ifdef USE_INPUT_EVENTS | |
| 41 #include <linux/input.h> | |
| 42 #endif | |
| 43 | |
| 44 #include "SDL_error.h" | |
| 45 #include "SDL_joystick.h" | |
| 46 #include "SDL_sysjoystick.h" | |
| 47 #include "SDL_joystick_c.h" | |
| 48 | |
| 49 /* Define this if you want to map axes to hats and trackballs */ | |
| 50 #define FANCY_HATS_AND_BALLS | |
| 51 | |
| 52 #ifdef FANCY_HATS_AND_BALLS | |
| 53 /* Special joystick configurations: | |
| 54 'JoystickName' Naxes Nhats Nballs | |
| 55 */ | |
| 56 static const char *special_joysticks[] = { | |
| 57 "'MadCatz Panther XL' 3 2 1", /* We don't handle a rudder (axis 8) */ | |
| 58 "'SideWinder Precision Pro' 4 1 0", | |
| 59 "'SideWinder 3D Pro' 4 1 0", | |
| 60 "'Microsoft SideWinder 3D Pro' 4 1 0", | |
| 61 "'Microsoft SideWinder Dual Strike USB version 1.0' 2 1 0", | |
| 62 "'WingMan Interceptor' 3 3 0", | |
| 63 /* WingMan Extreme Analog - not recognized by default | |
|
221
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64 "'Analog 3-axis 4-button joystick' 2 1 0", |
| 0 | 65 */ |
| 66 "'WingMan Extreme Digital 3D' 4 1 0", | |
|
221
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67 "'Analog 2-axis 4-button 1-hat FCS joystick' 2 1 0", |
| 0 | 68 NULL |
| 69 }; | |
| 70 #else | |
| 71 #undef USE_INPUT_EVENTS | |
| 72 #endif | |
| 73 | |
| 74 /* The maximum number of joysticks we'll detect */ | |
| 75 #define MAX_JOYSTICKS 32 | |
| 76 | |
| 77 /* A list of available joysticks */ | |
| 78 static char *SDL_joylist[MAX_JOYSTICKS]; | |
| 79 | |
| 80 /* The private structure used to keep track of a joystick */ | |
| 81 struct joystick_hwdata { | |
| 82 int fd; | |
| 83 /* The current linux joystick driver maps hats to two axes */ | |
| 84 int analog_hat; /* Well, except for analog hats */ | |
| 85 struct hwdata_hat { | |
| 86 int axis[2]; | |
| 87 } *hats; | |
| 88 /* The current linux joystick driver maps balls to two axes */ | |
| 89 struct hwdata_ball { | |
| 90 int axis[2]; | |
| 91 } *balls; | |
| 92 | |
| 93 /* Support for the Linux 2.4 unified input interface */ | |
| 94 SDL_bool is_hid; | |
| 95 #ifdef USE_INPUT_EVENTS | |
| 96 Uint8 key_map[KEY_MAX-BTN_MISC]; | |
| 97 Uint8 abs_map[ABS_MAX]; | |
| 98 struct axis_correct { | |
| 99 int used; | |
| 100 int coef[3]; | |
| 101 } abs_correct[ABS_MAX]; | |
| 102 #endif | |
| 103 }; | |
| 104 | |
| 105 static char *mystrdup(const char *string) | |
| 106 { | |
| 107 char *newstring; | |
| 108 | |
| 109 newstring = (char *)malloc(strlen(string)+1); | |
| 110 if ( newstring ) { | |
| 111 strcpy(newstring, string); | |
| 112 } | |
| 113 return(newstring); | |
| 114 } | |
| 115 | |
| 116 #ifdef USE_INPUT_EVENTS | |
| 117 #define test_bit(nr, addr) \ | |
| 118 (((1UL << ((nr) & 31)) & (((const unsigned int *) addr)[(nr) >> 5])) != 0) | |
| 119 | |
| 120 static int EV_IsJoystick(int fd) | |
| 121 { | |
| 122 unsigned long evbit[40]; | |
| 123 unsigned long keybit[40]; | |
| 124 unsigned long absbit[40]; | |
| 125 | |
| 126 if ( (ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) || | |
| 127 (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) || | |
| 128 (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0) ) { | |
| 129 return(0); | |
| 130 } | |
| 131 if (!(test_bit(EV_KEY, evbit) && test_bit(EV_ABS, evbit) && | |
| 132 test_bit(ABS_X, absbit) && test_bit(ABS_Y, absbit) && | |
| 133 (test_bit(BTN_TRIGGER, keybit) || test_bit(BTN_A, keybit) || test_bit(BTN_1, keybit)))) return 0; | |
| 134 return(1); | |
| 135 } | |
| 136 | |
| 137 #endif /* USE_INPUT_EVENTS */ | |
| 138 | |
| 139 /* Function to scan the system for joysticks */ | |
| 140 int SDL_SYS_JoystickInit(void) | |
| 141 { | |
| 142 /* The base path of the joystick devices */ | |
| 143 const char *joydev_pattern[2] = { | |
| 144 "/dev/js%d", | |
| 145 #ifdef USE_INPUT_EVENTS | |
| 146 "/dev/input/event%d" | |
|
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147 #endif |
| 0 | 148 "/dev/input/js%d" |
| 149 }; | |
| 150 int numjoysticks; | |
| 151 int i, j, done; | |
| 152 int fd; | |
| 153 char path[PATH_MAX]; | |
| 154 dev_t dev_nums[MAX_JOYSTICKS]; /* major/minor device numbers */ | |
| 155 struct stat sb; | |
| 156 int n, duplicate; | |
| 157 | |
| 158 numjoysticks = 0; | |
| 159 | |
| 160 /* First see if the user specified a joystick to use */ | |
| 161 if ( getenv("SDL_JOYSTICK_DEVICE") != NULL ) { | |
| 162 strncpy(path, getenv("SDL_JOYSTICK_DEVICE"), sizeof(path)); | |
| 163 path[sizeof(path)-1] = '\0'; | |
| 164 if ( stat(path, &sb) == 0 ) { | |
| 165 fd = open(path, O_RDONLY, 0); | |
| 166 if ( fd >= 0 ) { | |
| 167 /* Assume the user knows what they're doing. */ | |
| 168 SDL_joylist[numjoysticks] = mystrdup(path); | |
| 169 if ( SDL_joylist[numjoysticks] ) { | |
| 170 dev_nums[numjoysticks] = sb.st_rdev; | |
| 171 ++numjoysticks; | |
| 172 } | |
| 173 close(fd); | |
| 174 } | |
| 175 } | |
| 176 } | |
| 177 for ( i=0; i<SDL_TABLESIZE(joydev_pattern); ++i ) { | |
| 178 done = 0; | |
| 179 for ( j=0; (j < MAX_JOYSTICKS) && !done; ++j ) { | |
| 180 sprintf(path, joydev_pattern[i], j); | |
| 181 | |
| 182 /* rcg06302000 replaced access(F_OK) call with stat(). | |
| 183 * stat() will fail if the file doesn't exist, so it's | |
| 184 * equivalent behaviour. | |
| 185 */ | |
| 186 if ( stat(path, &sb) == 0 ) { | |
| 187 /* Check to make sure it's not already in list. | |
| 188 * This happens when we see a stick via symlink. | |
| 189 */ | |
| 190 duplicate = 0; | |
| 191 for (n=0; (n<numjoysticks) && !duplicate; ++n) { | |
| 192 if ( sb.st_rdev == dev_nums[n] ) { | |
| 193 duplicate = 1; | |
| 194 } | |
| 195 } | |
| 196 if (duplicate) { | |
| 197 continue; | |
| 198 } | |
| 199 | |
| 200 fd = open(path, O_RDONLY, 0); | |
| 201 if ( fd < 0 ) { | |
| 202 continue; | |
| 203 } | |
| 204 #ifdef USE_INPUT_EVENTS | |
| 205 #ifdef DEBUG_INPUT_EVENTS | |
| 206 printf("Checking %s\n", path); | |
| 207 #endif | |
| 208 if ( (i > 0) && ! EV_IsJoystick(fd) ) { | |
| 209 close(fd); | |
| 210 continue; | |
| 211 } | |
| 212 #endif | |
| 213 close(fd); | |
| 214 | |
| 215 /* We're fine, add this joystick */ | |
| 216 SDL_joylist[numjoysticks] = mystrdup(path); | |
| 217 if ( SDL_joylist[numjoysticks] ) { | |
| 218 dev_nums[numjoysticks] = sb.st_rdev; | |
| 219 ++numjoysticks; | |
| 220 } | |
| 221 } else { | |
| 222 done = 1; | |
| 223 } | |
| 224 } | |
|
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225 /* This is a special case... |
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226 If we're looking at the /dev/input event devices, and we found |
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227 at least one, then we don't want to look at the input joystick |
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228 devices, since they're built on top of devices that we've already |
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229 seen, so we're done. |
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230 */ |
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231 if ( i > 0 && j > 0 ) { |
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232 done = 1; |
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233 } |
| 0 | 234 } |
| 235 return(numjoysticks); | |
| 236 } | |
| 237 | |
| 238 /* Function to get the device-dependent name of a joystick */ | |
| 239 const char *SDL_SYS_JoystickName(int index) | |
| 240 { | |
| 241 int fd; | |
| 242 static char namebuf[128]; | |
| 243 char *name; | |
| 244 | |
| 245 name = NULL; | |
| 246 fd = open(SDL_joylist[index], O_RDONLY, 0); | |
| 247 if ( fd >= 0 ) { | |
| 248 if ( | |
| 249 #ifdef USE_INPUT_EVENTS | |
| 250 (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) && | |
| 251 #endif | |
| 252 (ioctl(fd, JSIOCGNAME(sizeof(namebuf)), namebuf) <= 0) ) { | |
| 253 name = SDL_joylist[index]; | |
| 254 } else { | |
| 255 name = namebuf; | |
| 256 } | |
| 257 close(fd); | |
| 258 } | |
| 259 return name; | |
| 260 } | |
| 261 | |
| 262 #ifdef FANCY_HATS_AND_BALLS | |
| 263 | |
| 264 static int allocate_hatdata(SDL_Joystick *joystick) | |
| 265 { | |
| 266 int i; | |
| 267 | |
| 268 joystick->hwdata->hats = (struct hwdata_hat *)malloc( | |
| 269 joystick->nhats * sizeof(struct hwdata_hat)); | |
| 270 if ( joystick->hwdata->hats == NULL ) { | |
| 271 return(-1); | |
| 272 } | |
| 273 for ( i=0; i<joystick->nhats; ++i ) { | |
| 274 joystick->hwdata->hats[i].axis[0] = 1; | |
| 275 joystick->hwdata->hats[i].axis[1] = 1; | |
| 276 } | |
| 277 return(0); | |
| 278 } | |
| 279 | |
| 280 static int allocate_balldata(SDL_Joystick *joystick) | |
| 281 { | |
| 282 int i; | |
| 283 | |
| 284 joystick->hwdata->balls = (struct hwdata_ball *)malloc( | |
| 285 joystick->nballs * sizeof(struct hwdata_ball)); | |
| 286 if ( joystick->hwdata->balls == NULL ) { | |
| 287 return(-1); | |
| 288 } | |
| 289 for ( i=0; i<joystick->nballs; ++i ) { | |
| 290 joystick->hwdata->balls[i].axis[0] = 0; | |
| 291 joystick->hwdata->balls[i].axis[1] = 0; | |
| 292 } | |
| 293 return(0); | |
| 294 } | |
| 295 | |
| 296 static SDL_bool ConfigJoystick(SDL_Joystick *joystick, | |
| 297 const char *name, const char *config) | |
| 298 { | |
| 299 char cfg_name[128]; | |
| 300 SDL_bool handled; | |
| 301 | |
| 302 if ( config == NULL ) { | |
| 303 return(SDL_FALSE); | |
| 304 } | |
| 305 strcpy(cfg_name, ""); | |
| 306 if ( *config == '\'' ) { | |
| 307 sscanf(config, "'%[^']s'", cfg_name); | |
| 308 config += strlen(cfg_name)+2; | |
| 309 } else { | |
| 310 sscanf(config, "%s", cfg_name); | |
| 311 config += strlen(cfg_name); | |
| 312 } | |
| 313 handled = SDL_FALSE; | |
| 314 if ( strcmp(cfg_name, name) == 0 ) { | |
| 315 /* Get the number of axes, hats and balls for this joystick */ | |
| 316 int joystick_axes = joystick->naxes; | |
| 317 sscanf(config, "%d %d %d", | |
| 318 &joystick->naxes, &joystick->nhats, &joystick->nballs); | |
| 319 | |
| 320 /* Allocate the extra data for mapping them */ | |
| 321 if ( joystick->nhats > 0 ) { | |
| 322 /* HACK: Analog hats map to only one axis */ | |
| 323 if (joystick_axes == (joystick->naxes+joystick->nhats)){ | |
| 324 joystick->hwdata->analog_hat = 1; | |
| 325 } else { | |
| 326 if ( allocate_hatdata(joystick) < 0 ) { | |
| 327 joystick->nhats = 0; | |
| 328 } | |
| 329 joystick->hwdata->analog_hat = 0; | |
| 330 } | |
| 331 } | |
| 332 if ( joystick->nballs > 0 ) { | |
| 333 if ( allocate_balldata(joystick) < 0 ) { | |
| 334 joystick->nballs = 0; | |
| 335 } | |
| 336 } | |
| 337 handled = SDL_TRUE; | |
| 338 } | |
| 339 return(handled); | |
| 340 } | |
| 341 | |
| 342 #ifdef USE_INPUT_EVENTS | |
| 343 | |
| 344 static SDL_bool EV_ConfigJoystick(SDL_Joystick *joystick, int fd) | |
| 345 { | |
| 346 int i; | |
| 347 unsigned long keybit[40]; | |
| 348 unsigned long absbit[40]; | |
| 349 unsigned long relbit[40]; | |
| 350 | |
| 351 /* See if this device uses the new unified event API */ | |
| 352 if ( (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) >= 0) && | |
| 353 (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) >= 0) && | |
| 354 (ioctl(fd, EVIOCGBIT(EV_REL, sizeof(relbit)), relbit) >= 0) ) { | |
| 355 joystick->hwdata->is_hid = SDL_TRUE; | |
| 356 | |
| 357 /* Get the number of buttons, axes, and other thingamajigs */ | |
| 358 for ( i=BTN_JOYSTICK; i < KEY_MAX; ++i ) { | |
| 359 if ( test_bit(i, keybit) ) { | |
| 360 #ifdef DEBUG_INPUT_EVENTS | |
| 361 printf("Joystick has button: 0x%x\n", i); | |
| 362 #endif | |
| 363 joystick->hwdata->key_map[i-BTN_MISC] = | |
| 364 joystick->nbuttons; | |
| 365 ++joystick->nbuttons; | |
| 366 } | |
| 367 } | |
| 368 for ( i=BTN_MISC; i < BTN_JOYSTICK; ++i ) { | |
| 369 if ( test_bit(i, keybit) ) { | |
| 370 #ifdef DEBUG_INPUT_EVENTS | |
| 371 printf("Joystick has button: 0x%x\n", i); | |
| 372 #endif | |
| 373 joystick->hwdata->key_map[i-BTN_MISC] = | |
| 374 joystick->nbuttons; | |
| 375 ++joystick->nbuttons; | |
| 376 } | |
| 377 } | |
| 378 for ( i=0; i<ABS_MAX; ++i ) { | |
| 379 /* Skip hats */ | |
| 380 if ( i == ABS_HAT0X ) { | |
| 381 i = ABS_HAT3Y; | |
| 382 continue; | |
| 383 } | |
| 384 if ( test_bit(i, absbit) ) { | |
| 385 int values[5]; | |
| 386 | |
| 387 ioctl(fd, EVIOCGABS(i), values); | |
| 388 #ifdef DEBUG_INPUT_EVENTS | |
| 389 printf("Joystick has absolute axis: %x\n", i); | |
| 390 printf("Values = { %d, %d, %d, %d, %d }\n", | |
| 391 values[0], values[1], | |
| 392 values[2], values[3], values[4]); | |
| 393 #endif /* DEBUG_INPUT_EVENTS */ | |
| 394 joystick->hwdata->abs_map[i] = joystick->naxes; | |
| 395 if ( values[1] == values[2] ) { | |
| 396 joystick->hwdata->abs_correct[i].used = 0; | |
| 397 } else { | |
| 398 joystick->hwdata->abs_correct[i].used = 1; | |
| 399 joystick->hwdata->abs_correct[i].coef[0] = | |
| 400 (values[2] + values[1]) / 2 - values[4]; | |
| 401 joystick->hwdata->abs_correct[i].coef[1] = | |
| 402 (values[2] + values[1]) / 2 + values[4]; | |
| 403 joystick->hwdata->abs_correct[i].coef[2] = | |
| 404 (1 << 29) / ((values[2] - values[1]) / 2 - 2 * values[4]); | |
| 405 } | |
| 406 ++joystick->naxes; | |
| 407 } | |
| 408 } | |
| 409 for ( i=ABS_HAT0X; i <= ABS_HAT3Y; i += 2 ) { | |
| 410 if ( test_bit(i, absbit) || test_bit(i+1, absbit) ) { | |
| 411 #ifdef DEBUG_INPUT_EVENTS | |
| 412 printf("Joystick has hat %d\n",(i-ABS_HAT0X)/2); | |
| 413 #endif | |
| 414 ++joystick->nhats; | |
| 415 } | |
| 416 } | |
| 417 if ( test_bit(REL_X, relbit) || test_bit(REL_Y, relbit) ) { | |
| 418 ++joystick->nballs; | |
| 419 } | |
| 420 | |
| 421 /* Allocate data to keep track of these thingamajigs */ | |
| 422 if ( joystick->nhats > 0 ) { | |
| 423 if ( allocate_hatdata(joystick) < 0 ) { | |
| 424 joystick->nhats = 0; | |
| 425 } | |
| 426 } | |
| 427 if ( joystick->nballs > 0 ) { | |
| 428 if ( allocate_balldata(joystick) < 0 ) { | |
| 429 joystick->nballs = 0; | |
| 430 } | |
| 431 } | |
| 432 } | |
| 433 return(joystick->hwdata->is_hid); | |
| 434 } | |
| 435 | |
| 436 #endif /* USE_INPUT_EVENTS */ | |
| 437 | |
| 438 #endif /* FANCY_HATS_AND_BALLS */ | |
| 439 | |
| 440 /* Function to open a joystick for use. | |
| 441 The joystick to open is specified by the index field of the joystick. | |
| 442 This should fill the nbuttons and naxes fields of the joystick structure. | |
| 443 It returns 0, or -1 if there is an error. | |
| 444 */ | |
| 445 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick) | |
| 446 { | |
| 447 #ifdef FANCY_HATS_AND_BALLS | |
| 448 const char *name; | |
| 449 int i; | |
| 450 #endif | |
| 451 int fd; | |
| 452 unsigned char n; | |
| 453 | |
| 454 /* Open the joystick and set the joystick file descriptor */ | |
| 455 fd = open(SDL_joylist[joystick->index], O_RDONLY, 0); | |
| 456 if ( fd < 0 ) { | |
| 457 SDL_SetError("Unable to open %s\n", | |
| 458 SDL_joylist[joystick->index]); | |
| 459 return(-1); | |
| 460 } | |
| 461 joystick->hwdata = (struct joystick_hwdata *) | |
| 462 malloc(sizeof(*joystick->hwdata)); | |
| 463 if ( joystick->hwdata == NULL ) { | |
| 464 SDL_OutOfMemory(); | |
| 465 close(fd); | |
| 466 return(-1); | |
| 467 } | |
| 468 memset(joystick->hwdata, 0, sizeof(*joystick->hwdata)); | |
| 469 joystick->hwdata->fd = fd; | |
| 470 | |
| 471 /* Set the joystick to non-blocking read mode */ | |
| 472 fcntl(fd, F_SETFL, O_NONBLOCK); | |
| 473 | |
| 474 /* Get the number of buttons and axes on the joystick */ | |
| 475 #ifdef USE_INPUT_EVENTS | |
| 476 if ( ! EV_ConfigJoystick(joystick, fd) ) | |
| 477 #endif | |
| 478 { | |
| 479 if ( ioctl(fd, JSIOCGAXES, &n) < 0 ) { | |
| 480 joystick->naxes = 2; | |
| 481 } else { | |
| 482 joystick->naxes = n; | |
| 483 } | |
| 484 if ( ioctl(fd, JSIOCGBUTTONS, &n) < 0 ) { | |
| 485 joystick->nbuttons = 2; | |
| 486 } else { | |
| 487 joystick->nbuttons = n; | |
| 488 } | |
| 489 #ifdef FANCY_HATS_AND_BALLS | |
| 490 /* Check for special joystick support */ | |
| 491 name = SDL_SYS_JoystickName(joystick->index); | |
| 492 for ( i=0; special_joysticks[i]; ++i ) { | |
| 493 if (ConfigJoystick(joystick,name,special_joysticks[i])){ | |
| 494 break; | |
| 495 } | |
| 496 } | |
| 497 if ( special_joysticks[i] == NULL ) { | |
| 498 ConfigJoystick(joystick, name, | |
| 499 getenv("SDL_LINUX_JOYSTICK")); | |
| 500 } | |
| 501 #endif /* FANCY_HATS_AND_BALLS */ | |
| 502 } | |
| 503 return(0); | |
| 504 } | |
| 505 | |
| 506 static __inline__ | |
| 507 void HandleHat(SDL_Joystick *stick, Uint8 hat, int axis, int value) | |
| 508 { | |
| 509 struct hwdata_hat *the_hat; | |
| 510 const Uint8 position_map[3][3] = { | |
| 511 { SDL_HAT_LEFTUP, SDL_HAT_UP, SDL_HAT_RIGHTUP }, | |
| 512 { SDL_HAT_LEFT, SDL_HAT_CENTERED, SDL_HAT_RIGHT }, | |
| 513 { SDL_HAT_LEFTDOWN, SDL_HAT_DOWN, SDL_HAT_RIGHTDOWN } | |
| 514 }; | |
| 515 | |
| 516 the_hat = &stick->hwdata->hats[hat]; | |
| 517 if ( value < 0 ) { | |
| 518 value = 0; | |
| 519 } else | |
| 520 if ( value == 0 ) { | |
| 521 value = 1; | |
| 522 } else | |
| 523 if ( value > 0 ) { | |
| 524 value = 2; | |
| 525 } | |
| 526 if ( value != the_hat->axis[axis] ) { | |
| 527 the_hat->axis[axis] = value; | |
| 528 SDL_PrivateJoystickHat(stick, hat, | |
| 529 position_map[the_hat->axis[1]][the_hat->axis[0]]); | |
| 530 } | |
| 531 } | |
| 532 | |
| 533 /* This was necessary for the Wingman Extreme Analog joystick */ | |
| 534 static __inline__ | |
| 535 void HandleAnalogHat(SDL_Joystick *stick, Uint8 hat, int value) | |
| 536 { | |
| 537 const Uint8 position_map[] = { | |
| 538 SDL_HAT_UP, | |
| 539 SDL_HAT_RIGHT, | |
| 540 SDL_HAT_DOWN, | |
| 541 SDL_HAT_LEFT, | |
| 542 SDL_HAT_CENTERED | |
| 543 }; | |
| 544 SDL_PrivateJoystickHat(stick, hat, position_map[(value/16000)+2]); | |
| 545 } | |
| 546 | |
| 547 static __inline__ | |
| 548 void HandleBall(SDL_Joystick *stick, Uint8 ball, int axis, int value) | |
| 549 { | |
| 550 stick->hwdata->balls[ball].axis[axis] += value; | |
| 551 } | |
| 552 | |
| 553 /* Function to update the state of a joystick - called as a device poll. | |
| 554 * This function shouldn't update the joystick structure directly, | |
| 555 * but instead should call SDL_PrivateJoystick*() to deliver events | |
| 556 * and update joystick device state. | |
| 557 */ | |
| 558 static __inline__ void JS_HandleEvents(SDL_Joystick *joystick) | |
| 559 { | |
| 560 struct js_event events[32]; | |
| 561 int i, len; | |
| 562 Uint8 other_axis; | |
| 563 | |
| 564 while ((len=read(joystick->hwdata->fd, events, (sizeof events))) > 0) { | |
| 565 len /= sizeof(events[0]); | |
| 566 for ( i=0; i<len; ++i ) { | |
| 567 switch (events[i].type & ~JS_EVENT_INIT) { | |
| 568 case JS_EVENT_AXIS: | |
| 569 if ( events[i].number < joystick->naxes ) { | |
| 570 SDL_PrivateJoystickAxis(joystick, | |
| 571 events[i].number, events[i].value); | |
| 572 break; | |
| 573 } | |
| 574 events[i].number -= joystick->naxes; | |
| 575 if ( joystick->hwdata->analog_hat ) { | |
| 576 other_axis = events[i].number; | |
| 577 if ( other_axis < joystick->nhats ) { | |
| 578 HandleAnalogHat(joystick, other_axis, | |
| 579 events[i].value); | |
| 580 break; | |
| 581 } | |
| 582 } else { | |
| 583 other_axis = (events[i].number / 2); | |
| 584 if ( other_axis < joystick->nhats ) { | |
| 585 HandleHat(joystick, other_axis, | |
| 586 events[i].number%2, | |
| 587 events[i].value); | |
| 588 break; | |
| 589 } | |
| 590 } | |
| 591 events[i].number -= joystick->nhats*2; | |
| 592 other_axis = (events[i].number / 2); | |
| 593 if ( other_axis < joystick->nballs ) { | |
| 594 HandleBall(joystick, other_axis, | |
| 595 events[i].number%2, | |
| 596 events[i].value); | |
| 597 break; | |
| 598 } | |
| 599 break; | |
| 600 case JS_EVENT_BUTTON: | |
| 601 SDL_PrivateJoystickButton(joystick, | |
| 602 events[i].number, events[i].value); | |
| 603 break; | |
| 604 default: | |
| 605 /* ?? */ | |
| 606 break; | |
| 607 } | |
| 608 } | |
| 609 } | |
| 610 } | |
| 611 #ifdef USE_INPUT_EVENTS | |
| 612 static __inline__ int EV_AxisCorrect(SDL_Joystick *joystick, int which, int value) | |
| 613 { | |
| 614 struct axis_correct *correct; | |
| 615 | |
| 616 correct = &joystick->hwdata->abs_correct[which]; | |
| 617 if ( correct->used ) { | |
| 618 if ( value > correct->coef[0] ) { | |
| 619 if ( value < correct->coef[1] ) { | |
| 620 return 0; | |
| 621 } | |
| 622 value -= correct->coef[1]; | |
| 623 } else { | |
| 624 value -= correct->coef[0]; | |
| 625 } | |
| 626 value *= correct->coef[2]; | |
| 627 value >>= 14; | |
| 628 } | |
| 629 /* Clamp and return */ | |
| 630 if ( value < -32767 ) { | |
| 631 value = -32767; | |
| 632 } else | |
| 633 if ( value > 32767 ) { | |
| 634 value = 32767; | |
| 635 } | |
| 636 return value; | |
| 637 } | |
| 638 | |
| 639 static __inline__ void EV_HandleEvents(SDL_Joystick *joystick) | |
| 640 { | |
| 641 struct input_event events[32]; | |
| 642 int i, len; | |
| 643 int code; | |
| 644 | |
| 645 while ((len=read(joystick->hwdata->fd, events, (sizeof events))) > 0) { | |
| 646 len /= sizeof(events[0]); | |
| 647 for ( i=0; i<len; ++i ) { | |
| 648 code = events[i].code; | |
| 649 switch (events[i].type) { | |
| 650 case EV_KEY: | |
| 651 if ( code >= BTN_MISC ) { | |
| 652 code -= BTN_MISC; | |
| 653 SDL_PrivateJoystickButton(joystick, | |
| 654 joystick->hwdata->key_map[code], | |
| 655 events[i].value); | |
| 656 } | |
| 657 break; | |
| 658 case EV_ABS: | |
| 659 switch (code) { | |
| 660 case ABS_HAT0X: | |
| 661 case ABS_HAT0Y: | |
| 662 case ABS_HAT1X: | |
| 663 case ABS_HAT1Y: | |
| 664 case ABS_HAT2X: | |
| 665 case ABS_HAT2Y: | |
| 666 case ABS_HAT3X: | |
| 667 case ABS_HAT3Y: | |
| 668 code -= ABS_HAT0X; | |
| 669 HandleHat(joystick, code/2, code%2, | |
| 670 events[i].value); | |
| 671 break; | |
| 672 default: | |
| 673 events[i].value = EV_AxisCorrect(joystick, code, events[i].value); | |
| 674 SDL_PrivateJoystickAxis(joystick, | |
| 675 joystick->hwdata->abs_map[code], | |
| 676 events[i].value); | |
| 677 break; | |
| 678 } | |
| 679 break; | |
| 680 case EV_REL: | |
| 681 switch (code) { | |
| 682 case REL_X: | |
| 683 case REL_Y: | |
| 684 code -= REL_X; | |
| 685 HandleBall(joystick, code/2, code%2, | |
| 686 events[i].value); | |
| 687 break; | |
| 688 default: | |
| 689 break; | |
| 690 } | |
| 691 break; | |
| 692 default: | |
| 693 break; | |
| 694 } | |
| 695 } | |
| 696 } | |
| 697 } | |
| 698 #endif /* USE_INPUT_EVENTS */ | |
| 699 | |
| 700 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick) | |
| 701 { | |
| 702 int i; | |
| 703 | |
| 704 #ifdef USE_INPUT_EVENTS | |
| 705 if ( joystick->hwdata->is_hid ) | |
| 706 EV_HandleEvents(joystick); | |
| 707 else | |
| 708 #endif | |
| 709 JS_HandleEvents(joystick); | |
| 710 | |
| 711 /* Deliver ball motion updates */ | |
| 712 for ( i=0; i<joystick->nballs; ++i ) { | |
| 713 int xrel, yrel; | |
| 714 | |
| 715 xrel = joystick->hwdata->balls[i].axis[0]; | |
| 716 yrel = joystick->hwdata->balls[i].axis[1]; | |
| 717 if ( xrel || yrel ) { | |
| 718 joystick->hwdata->balls[i].axis[0] = 0; | |
| 719 joystick->hwdata->balls[i].axis[1] = 0; | |
| 720 SDL_PrivateJoystickBall(joystick, (Uint8)i, xrel, yrel); | |
| 721 } | |
| 722 } | |
| 723 } | |
| 724 | |
| 725 /* Function to close a joystick after use */ | |
| 726 void SDL_SYS_JoystickClose(SDL_Joystick *joystick) | |
| 727 { | |
| 728 if ( joystick->hwdata ) { | |
| 729 close(joystick->hwdata->fd); | |
| 730 if ( joystick->hwdata->hats ) { | |
| 731 free(joystick->hwdata->hats); | |
| 732 } | |
| 733 if ( joystick->hwdata->balls ) { | |
| 734 free(joystick->hwdata->balls); | |
| 735 } | |
| 736 free(joystick->hwdata); | |
| 737 joystick->hwdata = NULL; | |
| 738 } | |
| 739 } | |
| 740 | |
| 741 /* Function to perform any system-specific joystick related cleanup */ | |
| 742 void SDL_SYS_JoystickQuit(void) | |
| 743 { | |
| 744 int i; | |
| 745 | |
| 746 for ( i=0; SDL_joylist[i]; ++i ) { | |
| 747 free(SDL_joylist[i]); | |
| 748 } | |
| 749 SDL_joylist[0] = NULL; | |
| 750 } | |
| 751 |