Mercurial > sdl-ios-xcode
annotate src/joystick/linux/SDL_sysjoystick.c @ 871:9cc9e2462d9a
Avoid FPE with Linux 2.6
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 05 Mar 2004 15:09:18 +0000 |
| parents | b8d311d90021 |
| children | e7be95d758e8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 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 | |
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20 slouken@libsdl.org |
| 0 | 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 */ | |
|
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38 #ifdef __arm__ |
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39 #include <linux/limits.h> /* Arm cross-compiler needs this */ |
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40 #endif |
| 0 | 41 #include <linux/joystick.h> |
| 42 #ifdef USE_INPUT_EVENTS | |
| 43 #include <linux/input.h> | |
| 44 #endif | |
| 45 | |
| 46 #include "SDL_error.h" | |
| 47 #include "SDL_joystick.h" | |
| 48 #include "SDL_sysjoystick.h" | |
| 49 #include "SDL_joystick_c.h" | |
| 50 | |
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51 /* Special joystick configurations */ |
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52 static struct { |
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53 const char *name; |
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54 int naxes; |
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55 int nhats; |
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56 int nballs; |
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57 } special_joysticks[] = { |
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58 { "MadCatz Panther XL", 3, 2, 1 }, /* We don't handle rudder (axis 8) */ |
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59 { "SideWinder Precision Pro", 4, 1, 0 }, |
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60 { "SideWinder 3D Pro", 4, 1, 0 }, |
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61 { "Microsoft SideWinder 3D Pro", 4, 1, 0 }, |
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62 { "Microsoft SideWinder Dual Strike USB version 1.0", 2, 1, 0 }, |
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63 { "WingMan Interceptor", 3, 3, 0 }, |
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64 { "WingMan Extreme Digital 3D", 4, 1, 0 }, |
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65 { "Microsoft SideWinder Precision 2 Joystick", 4, 1, 0 }, |
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66 { "Logitech Inc. WingMan Extreme Digital 3D", 4, 1, 0 }, |
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67 { "Saitek Saitek X45", 6, 1, 0 } |
| 0 | 68 }; |
| 69 | |
| 70 /* The maximum number of joysticks we'll detect */ | |
| 71 #define MAX_JOYSTICKS 32 | |
| 72 | |
| 73 /* A list of available joysticks */ | |
| 74 static char *SDL_joylist[MAX_JOYSTICKS]; | |
| 75 | |
| 76 /* The private structure used to keep track of a joystick */ | |
| 77 struct joystick_hwdata { | |
| 78 int fd; | |
| 79 /* The current linux joystick driver maps hats to two axes */ | |
| 80 struct hwdata_hat { | |
| 81 int axis[2]; | |
| 82 } *hats; | |
| 83 /* The current linux joystick driver maps balls to two axes */ | |
| 84 struct hwdata_ball { | |
| 85 int axis[2]; | |
| 86 } *balls; | |
| 87 | |
| 88 /* Support for the Linux 2.4 unified input interface */ | |
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89 #ifdef USE_INPUT_EVENTS |
| 0 | 90 SDL_bool is_hid; |
| 91 Uint8 key_map[KEY_MAX-BTN_MISC]; | |
| 92 Uint8 abs_map[ABS_MAX]; | |
| 93 struct axis_correct { | |
| 94 int used; | |
| 95 int coef[3]; | |
| 96 } abs_correct[ABS_MAX]; | |
| 97 #endif | |
| 98 }; | |
| 99 | |
| 100 static char *mystrdup(const char *string) | |
| 101 { | |
| 102 char *newstring; | |
| 103 | |
| 104 newstring = (char *)malloc(strlen(string)+1); | |
| 105 if ( newstring ) { | |
| 106 strcpy(newstring, string); | |
| 107 } | |
| 108 return(newstring); | |
| 109 } | |
| 110 | |
| 111 #ifdef USE_INPUT_EVENTS | |
| 112 #define test_bit(nr, addr) \ | |
| 113 (((1UL << ((nr) & 31)) & (((const unsigned int *) addr)[(nr) >> 5])) != 0) | |
| 114 | |
| 115 static int EV_IsJoystick(int fd) | |
| 116 { | |
| 117 unsigned long evbit[40]; | |
| 118 unsigned long keybit[40]; | |
| 119 unsigned long absbit[40]; | |
| 120 | |
| 121 if ( (ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) || | |
| 122 (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) || | |
| 123 (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0) ) { | |
| 124 return(0); | |
| 125 } | |
| 126 if (!(test_bit(EV_KEY, evbit) && test_bit(EV_ABS, evbit) && | |
| 127 test_bit(ABS_X, absbit) && test_bit(ABS_Y, absbit) && | |
| 128 (test_bit(BTN_TRIGGER, keybit) || test_bit(BTN_A, keybit) || test_bit(BTN_1, keybit)))) return 0; | |
| 129 return(1); | |
| 130 } | |
| 131 | |
| 132 #endif /* USE_INPUT_EVENTS */ | |
| 133 | |
| 134 /* Function to scan the system for joysticks */ | |
| 135 int SDL_SYS_JoystickInit(void) | |
| 136 { | |
| 137 /* The base path of the joystick devices */ | |
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138 const char *joydev_pattern[] = { |
| 0 | 139 #ifdef USE_INPUT_EVENTS |
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140 "/dev/input/event%d", |
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141 #endif |
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142 "/dev/input/js%d", |
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143 "/dev/js%d" |
| 0 | 144 }; |
| 145 int numjoysticks; | |
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146 int i, j; |
| 0 | 147 int fd; |
| 148 char path[PATH_MAX]; | |
| 149 dev_t dev_nums[MAX_JOYSTICKS]; /* major/minor device numbers */ | |
| 150 struct stat sb; | |
| 151 int n, duplicate; | |
| 152 | |
| 153 numjoysticks = 0; | |
| 154 | |
| 155 /* First see if the user specified a joystick to use */ | |
| 156 if ( getenv("SDL_JOYSTICK_DEVICE") != NULL ) { | |
| 157 strncpy(path, getenv("SDL_JOYSTICK_DEVICE"), sizeof(path)); | |
| 158 path[sizeof(path)-1] = '\0'; | |
| 159 if ( stat(path, &sb) == 0 ) { | |
| 160 fd = open(path, O_RDONLY, 0); | |
| 161 if ( fd >= 0 ) { | |
| 162 /* Assume the user knows what they're doing. */ | |
| 163 SDL_joylist[numjoysticks] = mystrdup(path); | |
| 164 if ( SDL_joylist[numjoysticks] ) { | |
| 165 dev_nums[numjoysticks] = sb.st_rdev; | |
| 166 ++numjoysticks; | |
| 167 } | |
| 168 close(fd); | |
| 169 } | |
| 170 } | |
| 171 } | |
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172 |
| 0 | 173 for ( i=0; i<SDL_TABLESIZE(joydev_pattern); ++i ) { |
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174 for ( j=0; j < MAX_JOYSTICKS; ++j ) { |
| 0 | 175 sprintf(path, joydev_pattern[i], j); |
| 176 | |
| 177 /* rcg06302000 replaced access(F_OK) call with stat(). | |
| 178 * stat() will fail if the file doesn't exist, so it's | |
| 179 * equivalent behaviour. | |
| 180 */ | |
| 181 if ( stat(path, &sb) == 0 ) { | |
| 182 /* Check to make sure it's not already in list. | |
| 183 * This happens when we see a stick via symlink. | |
| 184 */ | |
| 185 duplicate = 0; | |
| 186 for (n=0; (n<numjoysticks) && !duplicate; ++n) { | |
| 187 if ( sb.st_rdev == dev_nums[n] ) { | |
| 188 duplicate = 1; | |
| 189 } | |
| 190 } | |
| 191 if (duplicate) { | |
| 192 continue; | |
| 193 } | |
| 194 | |
| 195 fd = open(path, O_RDONLY, 0); | |
| 196 if ( fd < 0 ) { | |
| 197 continue; | |
| 198 } | |
| 199 #ifdef USE_INPUT_EVENTS | |
| 200 #ifdef DEBUG_INPUT_EVENTS | |
| 201 printf("Checking %s\n", path); | |
| 202 #endif | |
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203 if ( (i == 0) && ! EV_IsJoystick(fd) ) { |
| 0 | 204 close(fd); |
| 205 continue; | |
| 206 } | |
| 207 #endif | |
| 208 close(fd); | |
| 209 | |
| 210 /* We're fine, add this joystick */ | |
| 211 SDL_joylist[numjoysticks] = mystrdup(path); | |
| 212 if ( SDL_joylist[numjoysticks] ) { | |
| 213 dev_nums[numjoysticks] = sb.st_rdev; | |
| 214 ++numjoysticks; | |
| 215 } | |
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216 } else |
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217 break; |
| 0 | 218 } |
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219 |
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220 #ifdef USE_INPUT_EVENTS |
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221 /* This is a special case... |
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222 If the event devices are valid then the joystick devices |
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223 will be duplicates but without extra information about their |
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224 hats or balls. Unfortunately, the event devices can't |
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225 currently be calibrated, so it's a win-lose situation. |
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226 So : /dev/input/eventX = /dev/input/jsY = /dev/jsY |
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227 */ |
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228 if ( (i == 0) && (numjoysticks > 0) ) |
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229 break; |
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230 #endif |
| 0 | 231 } |
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232 |
| 0 | 233 return(numjoysticks); |
| 234 } | |
| 235 | |
| 236 /* Function to get the device-dependent name of a joystick */ | |
| 237 const char *SDL_SYS_JoystickName(int index) | |
| 238 { | |
| 239 int fd; | |
| 240 static char namebuf[128]; | |
| 241 char *name; | |
| 242 | |
| 243 name = NULL; | |
| 244 fd = open(SDL_joylist[index], O_RDONLY, 0); | |
| 245 if ( fd >= 0 ) { | |
| 246 if ( | |
| 247 #ifdef USE_INPUT_EVENTS | |
| 248 (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) && | |
| 249 #endif | |
| 250 (ioctl(fd, JSIOCGNAME(sizeof(namebuf)), namebuf) <= 0) ) { | |
| 251 name = SDL_joylist[index]; | |
| 252 } else { | |
| 253 name = namebuf; | |
| 254 } | |
| 255 close(fd); | |
| 256 } | |
| 257 return name; | |
| 258 } | |
| 259 | |
| 260 static int allocate_hatdata(SDL_Joystick *joystick) | |
| 261 { | |
| 262 int i; | |
| 263 | |
| 264 joystick->hwdata->hats = (struct hwdata_hat *)malloc( | |
| 265 joystick->nhats * sizeof(struct hwdata_hat)); | |
| 266 if ( joystick->hwdata->hats == NULL ) { | |
| 267 return(-1); | |
| 268 } | |
| 269 for ( i=0; i<joystick->nhats; ++i ) { | |
| 270 joystick->hwdata->hats[i].axis[0] = 1; | |
| 271 joystick->hwdata->hats[i].axis[1] = 1; | |
| 272 } | |
| 273 return(0); | |
| 274 } | |
| 275 | |
| 276 static int allocate_balldata(SDL_Joystick *joystick) | |
| 277 { | |
| 278 int i; | |
| 279 | |
| 280 joystick->hwdata->balls = (struct hwdata_ball *)malloc( | |
| 281 joystick->nballs * sizeof(struct hwdata_ball)); | |
| 282 if ( joystick->hwdata->balls == NULL ) { | |
| 283 return(-1); | |
| 284 } | |
| 285 for ( i=0; i<joystick->nballs; ++i ) { | |
| 286 joystick->hwdata->balls[i].axis[0] = 0; | |
| 287 joystick->hwdata->balls[i].axis[1] = 0; | |
| 288 } | |
| 289 return(0); | |
| 290 } | |
| 291 | |
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292 static SDL_bool JS_ConfigJoystick(SDL_Joystick *joystick, int fd) |
| 0 | 293 { |
| 294 SDL_bool handled; | |
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295 unsigned char n; |
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296 int old_axes, tmp_naxes, tmp_nhats, tmp_nballs; |
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297 const char *name; |
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298 char *env, env_name[128]; |
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299 int i; |
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300 |
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301 handled = SDL_FALSE; |
| 0 | 302 |
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303 /* Default joystick device settings */ |
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304 if ( ioctl(fd, JSIOCGAXES, &n) < 0 ) { |
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305 joystick->naxes = 2; |
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306 } else { |
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307 joystick->naxes = n; |
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308 } |
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309 if ( ioctl(fd, JSIOCGBUTTONS, &n) < 0 ) { |
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310 joystick->nbuttons = 2; |
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311 } else { |
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312 joystick->nbuttons = n; |
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313 } |
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314 |
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315 name = SDL_SYS_JoystickName(joystick->index); |
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316 old_axes = joystick->naxes; |
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317 |
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318 /* Generic analog joystick support */ |
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319 if ( strstr(name, "Analog") == name && strstr(name, "-hat") ) { |
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320 if ( sscanf(name,"Analog %d-axis %*d-button %d-hat", |
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321 &tmp_naxes, &tmp_nhats) == 2 ) { |
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322 |
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323 joystick->naxes = tmp_naxes; |
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324 joystick->nhats = tmp_nhats; |
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325 |
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326 handled = SDL_TRUE; |
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327 } |
| 0 | 328 } |
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329 |
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330 /* Special joystick support */ |
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331 for ( i=0; i < SDL_TABLESIZE(special_joysticks); ++i ) { |
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332 if ( strcmp(name, special_joysticks[i].name) == 0 ) { |
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333 |
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334 joystick->naxes = special_joysticks[i].naxes; |
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335 joystick->nhats = special_joysticks[i].nhats; |
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336 joystick->nballs = special_joysticks[i].nballs; |
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337 |
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338 handled = SDL_TRUE; |
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339 break; |
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340 } |
| 0 | 341 } |
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342 |
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343 /* User environment joystick support */ |
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344 if ( (env = getenv("SDL_LINUX_JOYSTICK")) ) { |
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345 strcpy(env_name, ""); |
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346 if ( *env == '\'' && sscanf(env, "'%[^']s'", env_name) == 1 ) |
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347 env += strlen(env_name)+2; |
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348 else if ( sscanf(env, "%s", env_name) == 1 ) |
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349 env += strlen(env_name); |
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350 |
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351 if ( strcmp(name, env_name) == 0 ) { |
| 0 | 352 |
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353 if ( sscanf(env, "%d %d %d", &tmp_naxes, &tmp_nhats, |
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354 &tmp_nballs) == 3 ) { |
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355 |
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356 joystick->naxes = tmp_naxes; |
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357 joystick->nhats = tmp_nhats; |
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358 joystick->nballs = tmp_nballs; |
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359 |
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360 handled = SDL_TRUE; |
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361 } |
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362 } |
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363 } |
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364 |
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365 /* Remap hats and balls */ |
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366 if (handled) { |
| 0 | 367 if ( joystick->nhats > 0 ) { |
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368 if ( allocate_hatdata(joystick) < 0 ) { |
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369 joystick->nhats = 0; |
| 0 | 370 } |
| 371 } | |
| 372 if ( joystick->nballs > 0 ) { | |
| 373 if ( allocate_balldata(joystick) < 0 ) { | |
| 374 joystick->nballs = 0; | |
| 375 } | |
| 376 } | |
| 377 } | |
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378 |
| 0 | 379 return(handled); |
| 380 } | |
| 381 | |
| 382 #ifdef USE_INPUT_EVENTS | |
| 383 | |
| 384 static SDL_bool EV_ConfigJoystick(SDL_Joystick *joystick, int fd) | |
| 385 { | |
| 871 | 386 int i, t; |
| 0 | 387 unsigned long keybit[40]; |
| 388 unsigned long absbit[40]; | |
| 389 unsigned long relbit[40]; | |
| 390 | |
| 391 /* See if this device uses the new unified event API */ | |
| 392 if ( (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) >= 0) && | |
| 393 (ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) >= 0) && | |
| 394 (ioctl(fd, EVIOCGBIT(EV_REL, sizeof(relbit)), relbit) >= 0) ) { | |
| 395 joystick->hwdata->is_hid = SDL_TRUE; | |
| 396 | |
| 397 /* Get the number of buttons, axes, and other thingamajigs */ | |
| 398 for ( i=BTN_JOYSTICK; i < KEY_MAX; ++i ) { | |
| 399 if ( test_bit(i, keybit) ) { | |
| 400 #ifdef DEBUG_INPUT_EVENTS | |
| 401 printf("Joystick has button: 0x%x\n", i); | |
| 402 #endif | |
| 403 joystick->hwdata->key_map[i-BTN_MISC] = | |
| 404 joystick->nbuttons; | |
| 405 ++joystick->nbuttons; | |
| 406 } | |
| 407 } | |
| 408 for ( i=BTN_MISC; i < BTN_JOYSTICK; ++i ) { | |
| 409 if ( test_bit(i, keybit) ) { | |
| 410 #ifdef DEBUG_INPUT_EVENTS | |
| 411 printf("Joystick has button: 0x%x\n", i); | |
| 412 #endif | |
| 413 joystick->hwdata->key_map[i-BTN_MISC] = | |
| 414 joystick->nbuttons; | |
| 415 ++joystick->nbuttons; | |
| 416 } | |
| 417 } | |
| 418 for ( i=0; i<ABS_MAX; ++i ) { | |
| 419 /* Skip hats */ | |
| 420 if ( i == ABS_HAT0X ) { | |
| 421 i = ABS_HAT3Y; | |
| 422 continue; | |
| 423 } | |
| 424 if ( test_bit(i, absbit) ) { | |
| 425 int values[5]; | |
| 426 | |
| 427 ioctl(fd, EVIOCGABS(i), values); | |
| 428 #ifdef DEBUG_INPUT_EVENTS | |
| 429 printf("Joystick has absolute axis: %x\n", i); | |
| 430 printf("Values = { %d, %d, %d, %d, %d }\n", | |
| 431 values[0], values[1], | |
| 432 values[2], values[3], values[4]); | |
| 433 #endif /* DEBUG_INPUT_EVENTS */ | |
| 434 joystick->hwdata->abs_map[i] = joystick->naxes; | |
| 435 if ( values[1] == values[2] ) { | |
| 436 joystick->hwdata->abs_correct[i].used = 0; | |
| 437 } else { | |
| 438 joystick->hwdata->abs_correct[i].used = 1; | |
| 871 | 439 t = (2 - values[4]); |
| 440 if ( t != 0 ) { | |
| 441 joystick->hwdata->abs_correct[i].coef[0] = (values[2] + values[1]) / t; | |
| 442 } | |
| 443 t = (2 + values[4]); | |
| 444 if ( t != 0 ) { | |
| 445 joystick->hwdata->abs_correct[i].coef[1] = (values[2] + values[1]) / t; | |
| 446 } | |
| 447 t = ((values[2] - values[1]) / 2 - 2 * values[4]); | |
| 448 if ( t != 0 ) { | |
| 449 joystick->hwdata->abs_correct[i].coef[2] = (1 << 29) / t; | |
| 450 } | |
| 0 | 451 } |
| 452 ++joystick->naxes; | |
| 453 } | |
| 454 } | |
| 455 for ( i=ABS_HAT0X; i <= ABS_HAT3Y; i += 2 ) { | |
| 456 if ( test_bit(i, absbit) || test_bit(i+1, absbit) ) { | |
| 457 #ifdef DEBUG_INPUT_EVENTS | |
| 458 printf("Joystick has hat %d\n",(i-ABS_HAT0X)/2); | |
| 459 #endif | |
| 460 ++joystick->nhats; | |
| 461 } | |
| 462 } | |
| 463 if ( test_bit(REL_X, relbit) || test_bit(REL_Y, relbit) ) { | |
| 464 ++joystick->nballs; | |
| 465 } | |
| 466 | |
| 467 /* Allocate data to keep track of these thingamajigs */ | |
| 468 if ( joystick->nhats > 0 ) { | |
| 469 if ( allocate_hatdata(joystick) < 0 ) { | |
| 470 joystick->nhats = 0; | |
| 471 } | |
| 472 } | |
| 473 if ( joystick->nballs > 0 ) { | |
| 474 if ( allocate_balldata(joystick) < 0 ) { | |
| 475 joystick->nballs = 0; | |
| 476 } | |
| 477 } | |
| 478 } | |
| 479 return(joystick->hwdata->is_hid); | |
| 480 } | |
| 481 | |
| 482 #endif /* USE_INPUT_EVENTS */ | |
| 483 | |
| 484 /* Function to open a joystick for use. | |
| 485 The joystick to open is specified by the index field of the joystick. | |
| 486 This should fill the nbuttons and naxes fields of the joystick structure. | |
| 487 It returns 0, or -1 if there is an error. | |
| 488 */ | |
| 489 int SDL_SYS_JoystickOpen(SDL_Joystick *joystick) | |
| 490 { | |
| 491 int fd; | |
| 492 | |
| 493 /* Open the joystick and set the joystick file descriptor */ | |
| 494 fd = open(SDL_joylist[joystick->index], O_RDONLY, 0); | |
| 495 if ( fd < 0 ) { | |
| 496 SDL_SetError("Unable to open %s\n", | |
| 497 SDL_joylist[joystick->index]); | |
| 498 return(-1); | |
| 499 } | |
| 500 joystick->hwdata = (struct joystick_hwdata *) | |
| 501 malloc(sizeof(*joystick->hwdata)); | |
| 502 if ( joystick->hwdata == NULL ) { | |
| 503 SDL_OutOfMemory(); | |
| 504 close(fd); | |
| 505 return(-1); | |
| 506 } | |
| 507 memset(joystick->hwdata, 0, sizeof(*joystick->hwdata)); | |
| 508 joystick->hwdata->fd = fd; | |
| 509 | |
| 510 /* Set the joystick to non-blocking read mode */ | |
| 511 fcntl(fd, F_SETFL, O_NONBLOCK); | |
| 512 | |
| 513 /* Get the number of buttons and axes on the joystick */ | |
| 514 #ifdef USE_INPUT_EVENTS | |
| 515 if ( ! EV_ConfigJoystick(joystick, fd) ) | |
| 516 #endif | |
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517 JS_ConfigJoystick(joystick, fd); |
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518 |
| 0 | 519 return(0); |
| 520 } | |
| 521 | |
| 522 static __inline__ | |
| 523 void HandleHat(SDL_Joystick *stick, Uint8 hat, int axis, int value) | |
| 524 { | |
| 525 struct hwdata_hat *the_hat; | |
| 526 const Uint8 position_map[3][3] = { | |
| 527 { SDL_HAT_LEFTUP, SDL_HAT_UP, SDL_HAT_RIGHTUP }, | |
| 528 { SDL_HAT_LEFT, SDL_HAT_CENTERED, SDL_HAT_RIGHT }, | |
| 529 { SDL_HAT_LEFTDOWN, SDL_HAT_DOWN, SDL_HAT_RIGHTDOWN } | |
| 530 }; | |
| 531 | |
| 532 the_hat = &stick->hwdata->hats[hat]; | |
| 533 if ( value < 0 ) { | |
| 534 value = 0; | |
| 535 } else | |
| 536 if ( value == 0 ) { | |
| 537 value = 1; | |
| 538 } else | |
| 539 if ( value > 0 ) { | |
| 540 value = 2; | |
| 541 } | |
| 542 if ( value != the_hat->axis[axis] ) { | |
| 543 the_hat->axis[axis] = value; | |
| 544 SDL_PrivateJoystickHat(stick, hat, | |
| 545 position_map[the_hat->axis[1]][the_hat->axis[0]]); | |
| 546 } | |
| 547 } | |
| 548 | |
| 549 static __inline__ | |
| 550 void HandleBall(SDL_Joystick *stick, Uint8 ball, int axis, int value) | |
| 551 { | |
| 552 stick->hwdata->balls[ball].axis[axis] += value; | |
| 553 } | |
| 554 | |
| 555 /* Function to update the state of a joystick - called as a device poll. | |
| 556 * This function shouldn't update the joystick structure directly, | |
| 557 * but instead should call SDL_PrivateJoystick*() to deliver events | |
| 558 * and update joystick device state. | |
| 559 */ | |
| 560 static __inline__ void JS_HandleEvents(SDL_Joystick *joystick) | |
| 561 { | |
| 562 struct js_event events[32]; | |
| 563 int i, len; | |
| 564 Uint8 other_axis; | |
| 565 | |
| 566 while ((len=read(joystick->hwdata->fd, events, (sizeof events))) > 0) { | |
| 567 len /= sizeof(events[0]); | |
| 568 for ( i=0; i<len; ++i ) { | |
| 569 switch (events[i].type & ~JS_EVENT_INIT) { | |
| 570 case JS_EVENT_AXIS: | |
| 571 if ( events[i].number < joystick->naxes ) { | |
| 572 SDL_PrivateJoystickAxis(joystick, | |
| 573 events[i].number, events[i].value); | |
| 574 break; | |
| 575 } | |
| 576 events[i].number -= joystick->naxes; | |
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577 other_axis = (events[i].number / 2); |
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578 if ( other_axis < joystick->nhats ) { |
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579 HandleHat(joystick, other_axis, |
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580 events[i].number%2, |
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581 events[i].value); |
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582 break; |
| 0 | 583 } |
| 584 events[i].number -= joystick->nhats*2; | |
| 585 other_axis = (events[i].number / 2); | |
| 586 if ( other_axis < joystick->nballs ) { | |
| 587 HandleBall(joystick, other_axis, | |
| 588 events[i].number%2, | |
| 589 events[i].value); | |
| 590 break; | |
| 591 } | |
| 592 break; | |
| 593 case JS_EVENT_BUTTON: | |
| 594 SDL_PrivateJoystickButton(joystick, | |
| 595 events[i].number, events[i].value); | |
| 596 break; | |
| 597 default: | |
| 598 /* ?? */ | |
| 599 break; | |
| 600 } | |
| 601 } | |
| 602 } | |
| 603 } | |
| 604 #ifdef USE_INPUT_EVENTS | |
| 605 static __inline__ int EV_AxisCorrect(SDL_Joystick *joystick, int which, int value) | |
| 606 { | |
| 607 struct axis_correct *correct; | |
| 608 | |
| 609 correct = &joystick->hwdata->abs_correct[which]; | |
| 610 if ( correct->used ) { | |
| 611 if ( value > correct->coef[0] ) { | |
| 612 if ( value < correct->coef[1] ) { | |
| 613 return 0; | |
| 614 } | |
| 615 value -= correct->coef[1]; | |
| 616 } else { | |
| 617 value -= correct->coef[0]; | |
| 618 } | |
| 619 value *= correct->coef[2]; | |
| 620 value >>= 14; | |
| 621 } | |
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622 |
| 0 | 623 /* Clamp and return */ |
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624 if ( value < -32767 ) return -32767; |
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625 if ( value > 32767 ) return 32767; |
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38b1a98aeb11
Linux joystick cleanups from Alan Swanson
Sam Lantinga <slouken@libsdl.org>
parents:
408
diff
changeset
|
626 |
| 0 | 627 return value; |
| 628 } | |
| 629 | |
| 630 static __inline__ void EV_HandleEvents(SDL_Joystick *joystick) | |
| 631 { | |
| 632 struct input_event events[32]; | |
| 633 int i, len; | |
| 634 int code; | |
| 635 | |
| 636 while ((len=read(joystick->hwdata->fd, events, (sizeof events))) > 0) { | |
| 637 len /= sizeof(events[0]); | |
| 638 for ( i=0; i<len; ++i ) { | |
| 639 code = events[i].code; | |
| 640 switch (events[i].type) { | |
| 641 case EV_KEY: | |
| 642 if ( code >= BTN_MISC ) { | |
| 643 code -= BTN_MISC; | |
| 644 SDL_PrivateJoystickButton(joystick, | |
| 645 joystick->hwdata->key_map[code], | |
| 646 events[i].value); | |
| 647 } | |
| 648 break; | |
| 649 case EV_ABS: | |
| 650 switch (code) { | |
| 651 case ABS_HAT0X: | |
| 652 case ABS_HAT0Y: | |
| 653 case ABS_HAT1X: | |
| 654 case ABS_HAT1Y: | |
| 655 case ABS_HAT2X: | |
| 656 case ABS_HAT2Y: | |
| 657 case ABS_HAT3X: | |
| 658 case ABS_HAT3Y: | |
| 659 code -= ABS_HAT0X; | |
| 660 HandleHat(joystick, code/2, code%2, | |
| 661 events[i].value); | |
| 662 break; | |
| 663 default: | |
| 664 events[i].value = EV_AxisCorrect(joystick, code, events[i].value); | |
| 665 SDL_PrivateJoystickAxis(joystick, | |
| 666 joystick->hwdata->abs_map[code], | |
| 667 events[i].value); | |
| 668 break; | |
| 669 } | |
| 670 break; | |
| 671 case EV_REL: | |
| 672 switch (code) { | |
| 673 case REL_X: | |
| 674 case REL_Y: | |
| 675 code -= REL_X; | |
| 676 HandleBall(joystick, code/2, code%2, | |
| 677 events[i].value); | |
| 678 break; | |
| 679 default: | |
| 680 break; | |
| 681 } | |
| 682 break; | |
| 683 default: | |
| 684 break; | |
| 685 } | |
| 686 } | |
| 687 } | |
| 688 } | |
| 689 #endif /* USE_INPUT_EVENTS */ | |
| 690 | |
| 691 void SDL_SYS_JoystickUpdate(SDL_Joystick *joystick) | |
| 692 { | |
| 693 int i; | |
| 694 | |
| 695 #ifdef USE_INPUT_EVENTS | |
| 696 if ( joystick->hwdata->is_hid ) | |
| 697 EV_HandleEvents(joystick); | |
| 698 else | |
| 699 #endif | |
| 700 JS_HandleEvents(joystick); | |
| 701 | |
| 702 /* Deliver ball motion updates */ | |
| 703 for ( i=0; i<joystick->nballs; ++i ) { | |
| 704 int xrel, yrel; | |
| 705 | |
| 706 xrel = joystick->hwdata->balls[i].axis[0]; | |
| 707 yrel = joystick->hwdata->balls[i].axis[1]; | |
| 708 if ( xrel || yrel ) { | |
| 709 joystick->hwdata->balls[i].axis[0] = 0; | |
| 710 joystick->hwdata->balls[i].axis[1] = 0; | |
| 711 SDL_PrivateJoystickBall(joystick, (Uint8)i, xrel, yrel); | |
| 712 } | |
| 713 } | |
| 714 } | |
| 715 | |
| 716 /* Function to close a joystick after use */ | |
| 717 void SDL_SYS_JoystickClose(SDL_Joystick *joystick) | |
| 718 { | |
| 719 if ( joystick->hwdata ) { | |
| 720 close(joystick->hwdata->fd); | |
| 721 if ( joystick->hwdata->hats ) { | |
| 722 free(joystick->hwdata->hats); | |
| 723 } | |
| 724 if ( joystick->hwdata->balls ) { | |
| 725 free(joystick->hwdata->balls); | |
| 726 } | |
| 727 free(joystick->hwdata); | |
| 728 joystick->hwdata = NULL; | |
| 729 } | |
| 730 } | |
| 731 | |
| 732 /* Function to perform any system-specific joystick related cleanup */ | |
| 733 void SDL_SYS_JoystickQuit(void) | |
| 734 { | |
| 735 int i; | |
| 736 | |
| 737 for ( i=0; SDL_joylist[i]; ++i ) { | |
| 738 free(SDL_joylist[i]); | |
| 739 } | |
| 740 SDL_joylist[0] = NULL; | |
| 741 } | |
| 742 |