linux/in_evdev.c

   1 /*
   2  * (C) Gražvydas "notaz" Ignotas, 2008-2012
   3  *
   4  * This work is licensed under the terms of any of these licenses
   5  * (at your option):
   6  *  - GNU GPL, version 2 or later.
   7  *  - GNU LGPL, version 2.1 or later.
   8  *  - MAME license.
   9  * See the COPYING file in the top-level directory.
  10  */
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <fcntl.h>
  18 #include <sys/ioctl.h>
  19 #include <unistd.h>
  20 #ifdef __FreeBSD__
  21 #include <dev/evdev/input.h>
  22 #else
  23 #include <linux/input.h>
  24 #endif
  25 #include <errno.h>
  26
  27 #include "../input.h"
  28 #include "in_evdev.h"
  29
  30 #define MAX_ABS_DEVS 8
  31
  32 typedef struct {
  33         int fd;
  34         int *kbits;
  35         int abs_min_x; /* abs->digital mapping */
  36         int abs_max_x;
  37         int abs_min_y;
  38         int abs_max_y;
  39         int abs_lzone;
  40         int abs_lastx;
  41         int abs_lasty;
  42         int kc_first;
  43         int kc_last;
  44         unsigned int abs_count;
  45         int abs_mult[MAX_ABS_DEVS]; /* 16.16 multiplier to IN_ABS_RANGE */
  46         int abs_adj[MAX_ABS_DEVS];  /* adjust for centering */
  47         unsigned int abs_to_digital:1;
  48
  49         const in_drv_t *drv;
  50 } in_evdev_t;
  51
  52 #ifndef KEY_CNT
  53 #define KEY_CNT (KEY_MAX + 1)
  54 #endif
  55
  56 #define KEYBITS_BIT(x) (keybits[(x)/sizeof(keybits[0])/8] & \
  57         (1 << ((x) & (sizeof(keybits[0])*8-1))))
  58
  59 #define KEYBITS_BIT_SET(x) (keybits[(x)/sizeof(keybits[0])/8] |= \
  60         (1 << ((x) & (sizeof(keybits[0])*8-1))))
  61
  62 #define KEYBITS_BIT_CLEAR(x) (keybits[(x)/sizeof(keybits[0])/8] &= \
  63         ~(1 << ((x) & (sizeof(keybits[0])*8-1))))
  64
  65 int in_evdev_allow_abs_only;
  66
  67 #define IN_EVDEV_PREFIX "evdev:"
  68
  69 static const char * const in_evdev_keys[KEY_CNT] = {
  70         // [0 ... KEY_MAX] = NULL, // not necessary
  71         [KEY_RESERVED] = "Reserved",            [KEY_ESC] = "Esc",
  72         [KEY_1] = "1",                          [KEY_2] = "2",
  73         [KEY_3] = "3",                          [KEY_4] = "4",
  74         [KEY_5] = "5",                          [KEY_6] = "6",
  75         [KEY_7] = "7",                          [KEY_8] = "8",
  76         [KEY_9] = "9",                          [KEY_0] = "0",
  77         [KEY_MINUS] = "Minus",                  [KEY_EQUAL] = "Equal",
  78         [KEY_BACKSPACE] = "Backspace",          [KEY_TAB] = "Tab",
  79         [KEY_Q] = "Q",                          [KEY_W] = "W",
  80         [KEY_E] = "E",                          [KEY_R] = "R",
  81         [KEY_T] = "T",                          [KEY_Y] = "Y",
  82         [KEY_U] = "U",                          [KEY_I] = "I",
  83         [KEY_O] = "O",                          [KEY_P] = "P",
  84         [KEY_LEFTBRACE] = "LeftBrace",          [KEY_RIGHTBRACE] = "RightBrace",
  85         [KEY_ENTER] = "Enter",                  [KEY_LEFTCTRL] = "LeftControl",
  86         [KEY_A] = "A",                          [KEY_S] = "S",
  87         [KEY_D] = "D",                          [KEY_F] = "F",
  88         [KEY_G] = "G",                          [KEY_H] = "H",
  89         [KEY_J] = "J",                          [KEY_K] = "K",
  90         [KEY_L] = "L",                          [KEY_SEMICOLON] = "Semicolon",
  91         [KEY_APOSTROPHE] = "Apostrophe",        [KEY_GRAVE] = "Grave",
  92         [KEY_LEFTSHIFT] = "LeftShift",          [KEY_BACKSLASH] = "BackSlash",
  93         [KEY_Z] = "Z",                          [KEY_X] = "X",
  94         [KEY_C] = "C",                          [KEY_V] = "V",
  95         [KEY_B] = "B",                          [KEY_N] = "N",
  96         [KEY_M] = "M",                          [KEY_COMMA] = "Comma",
  97         [KEY_DOT] = "Dot",                      [KEY_SLASH] = "Slash",
  98         [KEY_RIGHTSHIFT] = "RightShift",        [KEY_KPASTERISK] = "KPAsterisk",
  99         [KEY_LEFTALT] = "LeftAlt",              [KEY_SPACE] = "Space",
 100         [KEY_CAPSLOCK] = "CapsLock",            [KEY_F1] = "F1",
 101         [KEY_F2] = "F2",                        [KEY_F3] = "F3",
 102         [KEY_F4] = "F4",                        [KEY_F5] = "F5",
 103         [KEY_F6] = "F6",                        [KEY_F7] = "F7",
 104         [KEY_F8] = "F8",                        [KEY_F9] = "F9",
 105         [KEY_F10] = "F10",                      [KEY_NUMLOCK] = "NumLock",
 106         [KEY_SCROLLLOCK] = "ScrollLock",        [KEY_KP7] = "KP7",
 107         [KEY_KP8] = "KP8",                      [KEY_KP9] = "KP9",
 108         [KEY_KPMINUS] = "KPMinus",              [KEY_KP4] = "KP4",
 109         [KEY_KP5] = "KP5",                      [KEY_KP6] = "KP6",
 110         [KEY_KPPLUS] = "KPPlus",                [KEY_KP1] = "KP1",
 111         [KEY_KP2] = "KP2",                      [KEY_KP3] = "KP3",
 112         [KEY_KP0] = "KP0",                      [KEY_KPDOT] = "KPDot",
 113         [KEY_ZENKAKUHANKAKU] = "Zenkaku/Hankaku", [KEY_102ND] = "102nd",
 114         [KEY_F11] = "F11",                      [KEY_F12] = "F12",
 115         [KEY_KPJPCOMMA] = "KPJpComma",          [KEY_KPENTER] = "KPEnter",
 116         [KEY_RIGHTCTRL] = "RightCtrl",          [KEY_KPSLASH] = "KPSlash",
 117         [KEY_SYSRQ] = "SysRq",                  [KEY_RIGHTALT] = "RightAlt",
 118         [KEY_LINEFEED] = "LineFeed",            [KEY_HOME] = "Home",
 119         [KEY_UP] = "Up",                        [KEY_PAGEUP] = "PageUp",
 120         [KEY_LEFT] = "Left",                    [KEY_RIGHT] = "Right",
 121         [KEY_END] = "End",                      [KEY_DOWN] = "Down",
 122         [KEY_PAGEDOWN] = "PageDown",            [KEY_INSERT] = "Insert",
 123         [KEY_DELETE] = "Delete",                [KEY_MACRO] = "Macro",
 124         [KEY_HELP] = "Help",                    [KEY_MENU] = "Menu",
 125         [KEY_COFFEE] = "Coffee",                [KEY_DIRECTION] = "Direction",
 126         [BTN_0] = "Btn0",                       [BTN_1] = "Btn1",
 127         [BTN_2] = "Btn2",                       [BTN_3] = "Btn3",
 128         [BTN_4] = "Btn4",                       [BTN_5] = "Btn5",
 129         [BTN_6] = "Btn6",                       [BTN_7] = "Btn7",
 130         [BTN_8] = "Btn8",                       [BTN_9] = "Btn9",
 131         [BTN_LEFT] = "LeftBtn",                 [BTN_RIGHT] = "RightBtn",
 132         [BTN_MIDDLE] = "MiddleBtn",             [BTN_SIDE] = "SideBtn",
 133         [BTN_EXTRA] = "ExtraBtn",               [BTN_FORWARD] = "ForwardBtn",
 134         [BTN_BACK] = "BackBtn",                 [BTN_TASK] = "TaskBtn",
 135         [BTN_TRIGGER] = "Trigger",              [BTN_THUMB] = "ThumbBtn",
 136         [BTN_THUMB2] = "ThumbBtn2",             [BTN_TOP] = "TopBtn",
 137         [BTN_TOP2] = "TopBtn2",                 [BTN_PINKIE] = "PinkieBtn",
 138         [BTN_BASE] = "BaseBtn",                 [BTN_BASE2] = "BaseBtn2",
 139         [BTN_BASE3] = "BaseBtn3",               [BTN_BASE4] = "BaseBtn4",
 140         [BTN_BASE5] = "BaseBtn5",               [BTN_BASE6] = "BaseBtn6",
 141         [BTN_DEAD] = "BtnDead",                 [BTN_A] = "BtnA",
 142         [BTN_B] = "BtnB",                       [BTN_C] = "BtnC",
 143         [BTN_X] = "BtnX",                       [BTN_Y] = "BtnY",
 144         [BTN_Z] = "BtnZ",                       [BTN_TL] = "BtnTL",
 145         [BTN_TR] = "BtnTR",                     [BTN_TL2] = "BtnTL2",
 146         [BTN_TR2] = "BtnTR2",                   [BTN_SELECT] = "BtnSelect",
 147         [BTN_START] = "BtnStart",               [BTN_MODE] = "BtnMode",
 148         [BTN_THUMBL] = "BtnThumbL",             [BTN_THUMBR] = "BtnThumbR",
 149         [BTN_TOUCH] = "Touch",                  [BTN_STYLUS] = "Stylus",
 150         [BTN_STYLUS2] = "Stylus2",              [BTN_TOOL_DOUBLETAP] = "Tool Doubletap",
 151         [BTN_TOOL_TRIPLETAP] = "Tool Tripletap", [BTN_GEAR_DOWN] = "WheelBtn",
 152         [BTN_GEAR_UP] = "Gear up",              [KEY_OK] = "Ok",
 153 };
 154
 155
 156 static void in_evdev_probe(const in_drv_t *drv)
 157 {
 158         long keybits[KEY_CNT / sizeof(long) / 8];
 159         long absbits[(ABS_MAX+1) / sizeof(long) / 8];
 160         int i;
 161
 162         // the kernel might support and return less keys then we know about,
 163         // so make sure the buffers are clear.
 164         memset(keybits, 0, sizeof(keybits));
 165         memset(absbits, 0, sizeof(absbits));
 166
 167         for (i = 0;; i++)
 168         {
 169                 int support = 0, count = 0;
 170                 int u, ret, fd, kc_first = KEY_MAX, kc_last = 0, have_abs = 0;
 171                 in_evdev_t *dev;
 172                 char name[64];
 173
 174                 snprintf(name, sizeof(name), "/dev/input/event%d", i);
 175                 fd = open(name, O_RDONLY|O_NONBLOCK);
 176                 if (fd == -1) {
 177                         if (errno == EACCES)
 178                                 continue;       /* maybe we can access next one */
 179                         break;
 180                 }
 181
 182                 /* check supported events */
 183                 ret = ioctl(fd, EVIOCGBIT(0, sizeof(support)), &support);
 184                 if (ret == -1) {
 185                         printf("in_evdev: ioctl failed on %s\n", name);
 186                         goto skip;
 187                 }
 188
 189                 if (support & (1 << EV_KEY)) {
 190                         ret = ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
 191                         if (ret == -1) {
 192                                 printf("in_evdev: ioctl failed on %s\n", name);
 193                                 goto skip;
 194                         }
 195
 196                         /* check for interesting keys */
 197                         for (u = 0; u < KEY_CNT; u++) {
 198                                 if (KEYBITS_BIT(u)) {
 199                                         if (u < kc_first)
 200                                                 kc_first = u;
 201                                         if (u > kc_last)
 202                                                 kc_last = u;
 203                                         if (u != KEY_POWER && u != KEY_SLEEP && u != BTN_TOUCH)
 204                                                 count++;
 205                                         if (u == BTN_TOUCH) /* we can't deal with ts currently */
 206                                                 goto skip;
 207                                 }
 208                         }
 209                 }
 210
 211                 dev = calloc(1, sizeof(*dev));
 212                 if (dev == NULL)
 213                         goto skip;
 214
 215                 dev->drv = drv;
 216
 217                 ret = ioctl(fd, EVIOCGKEY(sizeof(keybits)), keybits);
 218                 if (ret == -1) {
 219                         printf("Warning: EVIOCGKEY not supported, will have to track state\n");
 220                         dev->kbits = calloc(KEY_CNT, sizeof(int));
 221                         if (dev->kbits == NULL) {
 222                                 free(dev);
 223                                 goto skip;
 224                         }
 225                 }
 226
 227                 /* check for abs too */
 228                 if (support & (1 << EV_ABS)) {
 229                         struct input_absinfo ainfo;
 230                         int dist;
 231                         ret = ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbits)), absbits);
 232                         if (ret == -1)
 233                                 goto no_abs;
 234                         if (absbits[0] & (1 << ABS_X)) {
 235                                 ret = ioctl(fd, EVIOCGABS(ABS_X), &ainfo);
 236                                 if (ret == -1)
 237                                         goto no_abs;
 238                                 dist = ainfo.maximum - ainfo.minimum;
 239                                 dev->abs_lzone = dist / 4;
 240                                 dev->abs_min_x = ainfo.minimum;
 241                                 dev->abs_max_x = ainfo.maximum;
 242                         }
 243                         if (absbits[0] & (1 << ABS_Y)) {
 244                                 ret = ioctl(fd, EVIOCGABS(ABS_Y), &ainfo);
 245                                 if (ret == -1)
 246                                         goto no_abs;
 247                                 dist = ainfo.maximum - ainfo.minimum;
 248                                 dev->abs_min_y = ainfo.minimum;
 249                                 dev->abs_max_y = ainfo.maximum;
 250                         }
 251                         for (u = 0; u < MAX_ABS_DEVS; u++) {
 252                                 ret = ioctl(fd, EVIOCGABS(u), &ainfo);
 253                                 if (ret == -1)
 254                                         break;
 255                                 dist = ainfo.maximum - ainfo.minimum;
 256                                 if (dist != 0)
 257                                         dev->abs_mult[u] = IN_ABS_RANGE * 2 * 65536 / dist;
 258                                 dev->abs_adj[u] = -(ainfo.maximum + ainfo.minimum + 1) / 2;
 259                                 have_abs = 1;
 260                         }
 261                         dev->abs_count = u;
 262                 }
 263
 264 no_abs:
 265                 if (count == 0 && !have_abs) {
 266                         free(dev->kbits);
 267                         free(dev);
 268                         goto skip;
 269                 }
 270
 271                 dev->fd = fd;
 272                 dev->kc_first = kc_first;
 273                 dev->kc_last = kc_last;
 274                 if (count > 0 || in_evdev_allow_abs_only)
 275                         dev->abs_to_digital = 1;
 276                 strcpy(name, IN_EVDEV_PREFIX);
 277                 ioctl(fd, EVIOCGNAME(sizeof(name)-6), name+6);
 278                 printf("in_evdev: found \"%s\" with %d events (type %08x)\n",
 279                         name+6, count, support);
 280                 in_register(name, fd, dev, KEY_CNT, in_evdev_keys, 0);
 281                 continue;
 282
 283 skip:
 284                 close(fd);
 285         }
 286 }
 287
 288 static void in_evdev_free(void *drv_data)
 289 {
 290         in_evdev_t *dev = drv_data;
 291         if (dev == NULL)
 292                 return;
 293         close(dev->fd);
 294         free(dev);
 295 }
 296
 297 static const char * const *
 298 in_evdev_get_key_names(const in_drv_t *drv, int *count)
 299 {
 300         const struct in_pdata *pdata = drv->pdata;
 301         *count = KEY_CNT;
 302
 303         if (pdata->key_names)
 304                 return pdata->key_names;
 305         return in_evdev_keys;
 306 }
 307
 308 static void or_binds(const int *binds, int key, int *result)
 309 {
 310         int t;
 311         for (t = 0; t < IN_BINDTYPE_COUNT; t++)
 312                 result[t] |= binds[IN_BIND_OFFS(key, t)];
 313 }
 314
 315 /* ORs result with binds of pressed buttons
 316  * XXX: should measure performance hit of this func, might need to optimize */
 317 static int in_evdev_update(void *drv_data, const int *binds, int *result)
 318 {
 319         struct input_event ev[16];
 320         struct input_absinfo ainfo;
 321         int keybits_[KEY_CNT / sizeof(int)];
 322         int *keybits = keybits_;
 323         in_evdev_t *dev = drv_data;
 324         int rd, ret, u, lzone;
 325
 326         if (dev->kbits == NULL) {
 327                 ret = ioctl(dev->fd, EVIOCGKEY(sizeof(keybits_)), keybits_);
 328                 if (ret == -1) {
 329                         perror("in_evdev: ioctl failed");
 330                         return -1;
 331                 }
 332         }
 333         else {
 334                 keybits = dev->kbits;
 335                 while (1) {
 336                         rd = read(dev->fd, ev, sizeof(ev));
 337                         if (rd < (int)sizeof(ev[0])) {
 338                                 if (errno != EAGAIN)
 339                                         perror("in_evdev: read failed");
 340                                 break;
 341                         }
 342                         for (u = 0; u < rd / sizeof(ev[0]); u++) {
 343                                 if (ev[u].type != EV_KEY)
 344                                         continue;
 345                                 else if (ev[u].value == 1)
 346                                         KEYBITS_BIT_SET(ev[u].code);
 347                                 else if (ev[u].value == 0)
 348                                         KEYBITS_BIT_CLEAR(ev[u].code);
 349                         }
 350                 }
 351         }
 352
 353         for (u = dev->kc_first; u <= dev->kc_last; u++) {
 354                 if (KEYBITS_BIT(u))
 355                         or_binds(binds, u, result);
 356         }
 357
 358         /* map X and Y absolute to UDLR */
 359         lzone = dev->abs_lzone;
 360         if (dev->abs_to_digital && lzone != 0) {
 361                 ret = ioctl(dev->fd, EVIOCGABS(ABS_X), &ainfo);
 362                 if (ret != -1) {
 363                         if (ainfo.value < dev->abs_min_x + lzone) or_binds(binds, KEY_LEFT, result);
 364                         if (ainfo.value > dev->abs_max_x - lzone) or_binds(binds, KEY_RIGHT, result);
 365                 }
 366                 ret = ioctl(dev->fd, EVIOCGABS(ABS_Y), &ainfo);
 367                 if (ret != -1) {
 368                         if (ainfo.value < dev->abs_min_y + lzone) or_binds(binds, KEY_UP, result);
 369                         if (ainfo.value > dev->abs_max_y - lzone) or_binds(binds, KEY_DOWN, result);
 370                 }
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int in_evdev_update_analog(void *drv_data, int axis_id, int *result)
 377 {
 378         struct input_absinfo ainfo;
 379         in_evdev_t *dev = drv_data;
 380         int ret;
 381
 382         if ((unsigned int)axis_id >= MAX_ABS_DEVS)
 383                 return -1;
 384
 385         ret = ioctl(dev->fd, EVIOCGABS(axis_id), &ainfo);
 386         if (ret != 0)
 387                 return ret;
 388
 389         *result = (ainfo.value + dev->abs_adj[axis_id]) * dev->abs_mult[axis_id];
 390         *result >>= 16;
 391         return 0;
 392 }
 393
 394 static int in_evdev_set_blocking(in_evdev_t *dev, int y)
 395 {
 396         long flags;
 397         int ret;
 398
 399         flags = (long)fcntl(dev->fd, F_GETFL);
 400         if ((int)flags == -1) {
 401                 perror("in_evdev: F_GETFL fcntl failed");
 402                 return -1;
 403         }
 404
 405         if (flags & O_NONBLOCK) {
 406                 /* flush the event queue */
 407                 struct input_event ev;
 408                 do {
 409                         ret = read(dev->fd, &ev, sizeof(ev));
 410                 }
 411                 while (ret == sizeof(ev));
 412         }
 413
 414         if (y)
 415                 flags &= ~O_NONBLOCK;
 416         else
 417                 flags |=  O_NONBLOCK;
 418         ret = fcntl(dev->fd, F_SETFL, flags);
 419         if (ret == -1) {
 420                 perror("in_evdev: F_SETFL fcntl failed");
 421                 return -1;
 422         }
 423
 424         return 0;
 425 }
 426
 427 static int in_evdev_get_config(void *drv_data, int what, int *val)
 428 {
 429         in_evdev_t *dev = drv_data;
 430
 431         switch (what) {
 432         case IN_CFG_ABS_AXIS_COUNT:
 433                 *val = dev->abs_count;
 434                 break;
 435         default:
 436                 return -1;
 437         }
 438
 439         return 0;
 440 }
 441
 442 static int in_evdev_set_config(void *drv_data, int what, int val)
 443 {
 444         in_evdev_t *dev = drv_data;
 445         int tmp;
 446
 447         switch (what) {
 448         case IN_CFG_BLOCKING:
 449                 return in_evdev_set_blocking(dev, val);
 450         case IN_CFG_ABS_DEAD_ZONE:
 451                 if (val < 1 || val > 99 || dev->abs_lzone == 0)
 452                         return -1;
 453                 /* XXX: based on X axis only, for now.. */
 454                 tmp = (dev->abs_max_x - dev->abs_min_x) / 2;
 455                 dev->abs_lzone = tmp - tmp * val / 100;
 456                 if (dev->abs_lzone < 1)
 457                         dev->abs_lzone = 1;
 458                 else if (dev->abs_lzone >= tmp)
 459                         dev->abs_lzone = tmp - 1;
 460                 break;
 461         default:
 462                 return -1;
 463         }
 464
 465         return 0;
 466 }
 467
 468 static int in_evdev_update_keycode(void *data, int *is_down)
 469 {
 470         int ret_kc = -1, ret_down = 0;
 471         in_evdev_t *dev = data;
 472         struct input_event ev;
 473         int rd;
 474
 475         /* do single event, the caller sometimes wants
 476          * to do select() in blocking mode */
 477         rd = read(dev->fd, &ev, sizeof(ev));
 478         if (rd < (int) sizeof(ev)) {
 479                 if (errno != EAGAIN) {
 480                         perror("in_evdev: error reading");
 481                         //sleep(1);
 482                         ret_kc = -2;
 483                 }
 484                 goto out;
 485         }
 486
 487         if (ev.type == EV_KEY) {
 488                 if (ev.value < 0 || ev.value > 1)
 489                         goto out;
 490                 ret_kc = ev.code;
 491                 ret_down = ev.value;
 492                 goto out;
 493         }
 494         else if (ev.type == EV_ABS && dev->abs_to_digital)
 495         {
 496                 int lzone = dev->abs_lzone, down = 0, *last;
 497
 498                 // map absolute to up/down/left/right
 499                 if (lzone != 0 && ev.code == ABS_X) {
 500                         if (ev.value < dev->abs_min_x + lzone)
 501                                 down = KEY_LEFT;
 502                         else if (ev.value > dev->abs_max_x - lzone)
 503                                 down = KEY_RIGHT;
 504                         last = &dev->abs_lastx;
 505                 }
 506                 else if (lzone != 0 && ev.code == ABS_Y) {
 507                         if (ev.value < dev->abs_min_y + lzone)
 508                                 down = KEY_UP;
 509                         else if (ev.value > dev->abs_max_y - lzone)
 510                                 down = KEY_DOWN;
 511                         last = &dev->abs_lasty;
 512                 }
 513                 else
 514                         goto out;
 515
 516                 if (down == *last)
 517                         goto out;
 518
 519                 if (down == 0 || *last != 0) {
 520                         /* key up or direction change, return up event for old key */
 521                         ret_kc = *last;
 522                         ret_down = 0;
 523                         *last = 0;
 524                         goto out;
 525                 }
 526                 ret_kc = *last = down;
 527                 ret_down = 1;
 528                 goto out;
 529         }
 530
 531 out:
 532         if (is_down != NULL)
 533                 *is_down = ret_down;
 534
 535         return ret_kc;
 536 }
 537
 538 static int in_evdev_menu_translate(void *drv_data, int keycode, char *charcode)
 539 {
 540         in_evdev_t *dev = drv_data;
 541         const struct in_pdata *pdata = dev->drv->pdata;
 542         int ret = 0;
 543         int i;
 544
 545         if (keycode < 0)
 546         {
 547                 /* menu -> kc */
 548                 keycode = -keycode;
 549                 for (i = 0; i < pdata->kmap_size; i++)
 550                         if (pdata->key_map[i].pbtn == keycode) {
 551                                 int k = pdata->key_map[i].key;
 552                                 /* should really check EVIOCGBIT, but this is enough for now */
 553                                 if (dev->kc_first <= k && k <= dev->kc_last)
 554                                         return k;
 555                         }
 556         }
 557         else
 558         {
 559                 for (i = 0; i < pdata->kmap_size; i++) {
 560                         if (pdata->key_map[i].key == keycode) {
 561                                 ret = pdata->key_map[i].pbtn;
 562                                 break;
 563                         }
 564                 }
 565
 566                 if (charcode != NULL && (unsigned int)keycode < KEY_CNT &&
 567                     in_evdev_keys[keycode] != NULL && in_evdev_keys[keycode][1] == 0)
 568                 {
 569                         char c = in_evdev_keys[keycode][0];
 570                         if ('A' <= c && c <= 'Z')
 571                                 c = 'a' + c - 'A';
 572                         ret |= PBTN_CHAR;
 573                         *charcode = c;
 574                 }
 575         }
 576
 577         return ret;
 578 }
 579
 580 /* remove binds of missing keys, count remaining ones */
 581 static int in_evdev_clean_binds(void *drv_data, int *binds, int *def_binds)
 582 {
 583         int keybits[KEY_CNT / sizeof(int)];
 584         in_evdev_t *dev = drv_data;
 585         int i, t, ret, offs, count = 0;
 586
 587         memset(keybits, 0, sizeof(keybits));
 588         ret = ioctl(dev->fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
 589         if (ret == -1) {
 590                 perror("in_evdev: ioctl failed");
 591                 // memset(keybits, 0xff, sizeof(keybits)); /* mark all as good */
 592         }
 593
 594         if (dev->abs_to_digital && dev->abs_lzone != 0) {
 595                 KEYBITS_BIT_SET(KEY_LEFT);
 596                 KEYBITS_BIT_SET(KEY_RIGHT);
 597                 KEYBITS_BIT_SET(KEY_UP);
 598                 KEYBITS_BIT_SET(KEY_DOWN);
 599         }
 600
 601         for (i = 0; i < KEY_CNT; i++) {
 602                 for (t = 0; t < IN_BINDTYPE_COUNT; t++) {
 603                         offs = IN_BIND_OFFS(i, t);
 604                         if (!KEYBITS_BIT(i))
 605                                 binds[offs] = def_binds[offs] = 0;
 606                         if (binds[offs])
 607                                 count++;
 608                 }
 609         }
 610
 611         return count;
 612 }
 613
 614 static const in_drv_t in_evdev_drv = {
 615         .prefix         = IN_EVDEV_PREFIX,
 616         .probe          = in_evdev_probe,
 617         .free           = in_evdev_free,
 618         .get_key_names  = in_evdev_get_key_names,
 619         .clean_binds    = in_evdev_clean_binds,
 620         .get_config     = in_evdev_get_config,
 621         .set_config     = in_evdev_set_config,
 622         .update         = in_evdev_update,
 623         .update_analog  = in_evdev_update_analog,
 624         .update_keycode = in_evdev_update_keycode,
 625         .menu_translate = in_evdev_menu_translate,
 626 };
 627
 628 int in_evdev_init(const struct in_pdata *pdata)
 629 {
 630         if (!pdata) {
 631                 fprintf(stderr, "in_sdl: Missing input platform data\n");
 632                 return -1;
 633         }
 634
 635         in_register_driver(&in_evdev_drv, pdata->defbinds, pdata);
 636         return 0;
 637 }
 638