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