linux/in_evdev.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <sys/types.h>
   5 #include <sys/stat.h>
   6 #include <fcntl.h>
   7 #include <sys/ioctl.h>
   8 #include <unistd.h>
   9 #include <linux/input.h>
  10 #include <errno.h>
  11
  12 #include "../common/input.h"
  13 #include "in_evdev.h"
  14
  15 typedef struct {
  16         int fd;
  17         int abs_lzone;
  18         int abs_rzone;
  19         int abs_tzone;
  20         int abs_bzone;
  21         int abs_lastx;
  22         int abs_lasty;
  23 } in_evdev_t;
  24
  25 #ifndef KEY_CNT
  26 #define KEY_CNT (KEY_MAX + 1)
  27 #endif
  28
  29 #define KEYBITS_BIT(x) (keybits[(x)/sizeof(keybits[0])/8] & \
  30         (1 << ((x) & (sizeof(keybits[0])*8-1))))
  31
  32 #define KEYBITS_BIT_SET(x) (keybits[(x)/sizeof(keybits[0])/8] |= \
  33         (1 << ((x) & (sizeof(keybits[0])*8-1))))
  34
  35 static const char * const in_evdev_prefix = "evdev:";
  36 static const char * const in_evdev_keys[KEY_CNT] = {
  37         [0 ... KEY_MAX] = NULL,
  38         [KEY_RESERVED] = "Reserved",            [KEY_ESC] = "Esc",
  39         [KEY_1] = "1",                          [KEY_2] = "2",
  40         [KEY_3] = "3",                          [KEY_4] = "4",
  41         [KEY_5] = "5",                          [KEY_6] = "6",
  42         [KEY_7] = "7",                          [KEY_8] = "8",
  43         [KEY_9] = "9",                          [KEY_0] = "0",
  44         [KEY_MINUS] = "Minus",                  [KEY_EQUAL] = "Equal",
  45         [KEY_BACKSPACE] = "Backspace",          [KEY_TAB] = "Tab",
  46         [KEY_Q] = "Q",                          [KEY_W] = "W",
  47         [KEY_E] = "E",                          [KEY_R] = "R",
  48         [KEY_T] = "T",                          [KEY_Y] = "Y",
  49         [KEY_U] = "U",                          [KEY_I] = "I",
  50         [KEY_O] = "O",                          [KEY_P] = "P",
  51         [KEY_LEFTBRACE] = "LeftBrace",          [KEY_RIGHTBRACE] = "RightBrace",
  52         [KEY_ENTER] = "Enter",                  [KEY_LEFTCTRL] = "LeftControl",
  53         [KEY_A] = "A",                          [KEY_S] = "S",
  54         [KEY_D] = "D",                          [KEY_F] = "F",
  55         [KEY_G] = "G",                          [KEY_H] = "H",
  56         [KEY_J] = "J",                          [KEY_K] = "K",
  57         [KEY_L] = "L",                          [KEY_SEMICOLON] = "Semicolon",
  58         [KEY_APOSTROPHE] = "Apostrophe",        [KEY_GRAVE] = "Grave",
  59         [KEY_LEFTSHIFT] = "LeftShift",          [KEY_BACKSLASH] = "BackSlash",
  60         [KEY_Z] = "Z",                          [KEY_X] = "X",
  61         [KEY_C] = "C",                          [KEY_V] = "V",
  62         [KEY_B] = "B",                          [KEY_N] = "N",
  63         [KEY_M] = "M",                          [KEY_COMMA] = "Comma",
  64         [KEY_DOT] = "Dot",                      [KEY_SLASH] = "Slash",
  65         [KEY_RIGHTSHIFT] = "RightShift",        [KEY_KPASTERISK] = "KPAsterisk",
  66         [KEY_LEFTALT] = "LeftAlt",              [KEY_SPACE] = "Space",
  67         [KEY_CAPSLOCK] = "CapsLock",            [KEY_F1] = "F1",
  68         [KEY_F2] = "F2",                        [KEY_F3] = "F3",
  69         [KEY_F4] = "F4",                        [KEY_F5] = "F5",
  70         [KEY_F6] = "F6",                        [KEY_F7] = "F7",
  71         [KEY_F8] = "F8",                        [KEY_F9] = "F9",
  72         [KEY_F10] = "F10",                      [KEY_NUMLOCK] = "NumLock",
  73         [KEY_SCROLLLOCK] = "ScrollLock",        [KEY_KP7] = "KP7",
  74         [KEY_KP8] = "KP8",                      [KEY_KP9] = "KP9",
  75         [KEY_KPMINUS] = "KPMinus",              [KEY_KP4] = "KP4",
  76         [KEY_KP5] = "KP5",                      [KEY_KP6] = "KP6",
  77         [KEY_KPPLUS] = "KPPlus",                [KEY_KP1] = "KP1",
  78         [KEY_KP2] = "KP2",                      [KEY_KP3] = "KP3",
  79         [KEY_KP0] = "KP0",                      [KEY_KPDOT] = "KPDot",
  80         [KEY_ZENKAKUHANKAKU] = "Zenkaku/Hankaku", [KEY_102ND] = "102nd",
  81         [KEY_F11] = "F11",                      [KEY_F12] = "F12",
  82         [KEY_KPJPCOMMA] = "KPJpComma",          [KEY_KPENTER] = "KPEnter",
  83         [KEY_RIGHTCTRL] = "RightCtrl",          [KEY_KPSLASH] = "KPSlash",
  84         [KEY_SYSRQ] = "SysRq",                  [KEY_RIGHTALT] = "RightAlt",
  85         [KEY_LINEFEED] = "LineFeed",            [KEY_HOME] = "Home",
  86         [KEY_UP] = "Up",                        [KEY_PAGEUP] = "PageUp",
  87         [KEY_LEFT] = "Left",                    [KEY_RIGHT] = "Right",
  88         [KEY_END] = "End",                      [KEY_DOWN] = "Down",
  89         [KEY_PAGEDOWN] = "PageDown",            [KEY_INSERT] = "Insert",
  90         [KEY_DELETE] = "Delete",                [KEY_MACRO] = "Macro",
  91         [KEY_HELP] = "Help",                    [KEY_MENU] = "Menu",
  92         [KEY_COFFEE] = "Coffee",                [KEY_DIRECTION] = "Direction",
  93         [BTN_0] = "Btn0",                       [BTN_1] = "Btn1",
  94         [BTN_2] = "Btn2",                       [BTN_3] = "Btn3",
  95         [BTN_4] = "Btn4",                       [BTN_5] = "Btn5",
  96         [BTN_6] = "Btn6",                       [BTN_7] = "Btn7",
  97         [BTN_8] = "Btn8",                       [BTN_9] = "Btn9",
  98         [BTN_LEFT] = "LeftBtn",                 [BTN_RIGHT] = "RightBtn",
  99         [BTN_MIDDLE] = "MiddleBtn",             [BTN_SIDE] = "SideBtn",
 100         [BTN_EXTRA] = "ExtraBtn",               [BTN_FORWARD] = "ForwardBtn",
 101         [BTN_BACK] = "BackBtn",                 [BTN_TASK] = "TaskBtn",
 102         [BTN_TRIGGER] = "Trigger",              [BTN_THUMB] = "ThumbBtn",
 103         [BTN_THUMB2] = "ThumbBtn2",             [BTN_TOP] = "TopBtn",
 104         [BTN_TOP2] = "TopBtn2",                 [BTN_PINKIE] = "PinkieBtn",
 105         [BTN_BASE] = "BaseBtn",                 [BTN_BASE2] = "BaseBtn2",
 106         [BTN_BASE3] = "BaseBtn3",               [BTN_BASE4] = "BaseBtn4",
 107         [BTN_BASE5] = "BaseBtn5",               [BTN_BASE6] = "BaseBtn6",
 108         [BTN_DEAD] = "BtnDead",                 [BTN_A] = "BtnA",
 109         [BTN_B] = "BtnB",                       [BTN_C] = "BtnC",
 110         [BTN_X] = "BtnX",                       [BTN_Y] = "BtnY",
 111         [BTN_Z] = "BtnZ",                       [BTN_TL] = "BtnTL",
 112         [BTN_TR] = "BtnTR",                     [BTN_TL2] = "BtnTL2",
 113         [BTN_TR2] = "BtnTR2",                   [BTN_SELECT] = "BtnSelect",
 114         [BTN_START] = "BtnStart",               [BTN_MODE] = "BtnMode",
 115         [BTN_THUMBL] = "BtnThumbL",             [BTN_THUMBR] = "BtnThumbR",
 116         [BTN_TOUCH] = "Touch",                  [BTN_STYLUS] = "Stylus",
 117         [BTN_STYLUS2] = "Stylus2",              [BTN_TOOL_DOUBLETAP] = "Tool Doubletap",
 118         [BTN_TOOL_TRIPLETAP] = "Tool Tripletap", [BTN_GEAR_DOWN] = "WheelBtn",
 119         [BTN_GEAR_UP] = "Gear up",              [KEY_OK] = "Ok",
 120 };
 121
 122
 123 static void in_evdev_probe(void)
 124 {
 125         int i;
 126
 127         for (i = 0;; i++)
 128         {
 129                 int keybits[KEY_CNT / sizeof(int)], absbits[(ABS_MAX+1)/sizeof(int)];
 130                 int support = 0, count = 0;
 131                 in_evdev_t *dev;
 132                 int u, ret, fd;
 133                 char name[64];
 134
 135                 snprintf(name, sizeof(name), "/dev/input/event%d", i);
 136                 fd = open(name, O_RDONLY|O_NONBLOCK);
 137                 if (fd == -1) {
 138                         if (errno == EACCES)
 139                                 continue;       /* maybe we can access next one */
 140                         break;
 141                 }
 142
 143                 /* check supported events */
 144                 ret = ioctl(fd, EVIOCGBIT(0, sizeof(support)), &support);
 145                 if (ret == -1) {
 146                         printf("in_evdev: ioctl failed on %s\n", name);
 147                         goto skip;
 148                 }
 149
 150                 if (!(support & (1 << EV_KEY)))
 151                         goto skip;
 152
 153                 ret = ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
 154                 if (ret == -1) {
 155                         printf("in_evdev: ioctl failed on %s\n", name);
 156                         goto skip;
 157                 }
 158
 159                 /* check for interesting keys */
 160                 for (u = 0; u < KEY_CNT; u++) {
 161                         if (KEYBITS_BIT(u) && u != KEY_POWER && u != KEY_SLEEP && u != BTN_TOUCH)
 162                                 count++;
 163                 }
 164
 165                 if (count == 0)
 166                         goto skip;
 167
 168                 dev = calloc(1, sizeof(*dev));
 169                 if (dev == NULL)
 170                         goto skip;
 171
 172                 /* check for abs too */
 173                 if (support & (1 << EV_ABS)) {
 174                         struct input_absinfo ainfo;
 175                         int dist;
 176                         ret = ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbits)), absbits);
 177                         if (ret == -1)
 178                                 goto no_abs;
 179                         if (absbits[0] & (1 << ABS_X)) {
 180                                 ret = ioctl(fd, EVIOCGABS(ABS_X), &ainfo);
 181                                 if (ret == -1)
 182                                         goto no_abs;
 183                                 dist = ainfo.maximum - ainfo.minimum;
 184                                 dev->abs_lzone = ainfo.minimum + dist / 4;
 185                                 dev->abs_rzone = ainfo.maximum - dist / 4;
 186                         }
 187                         if (absbits[0] & (1 << ABS_Y)) {
 188                                 ret = ioctl(fd, EVIOCGABS(ABS_Y), &ainfo);
 189                                 if (ret == -1)
 190                                         goto no_abs;
 191                                 dist = ainfo.maximum - ainfo.minimum;
 192                                 dev->abs_tzone = ainfo.minimum + dist / 4;
 193                                 dev->abs_bzone = ainfo.maximum - dist / 4;
 194                         }
 195                 }
 196
 197 no_abs:
 198                 dev->fd = fd;
 199                 strcpy(name, in_evdev_prefix);
 200                 ioctl(fd, EVIOCGNAME(sizeof(name)-6), name+6);
 201                 printf("in_evdev: found \"%s\" with %d events (type %08x)\n",
 202                         name+6, count, support);
 203                 in_register(name, IN_DRVID_EVDEV, fd, dev, KEY_CNT, 0);
 204                 continue;
 205
 206 skip:
 207                 close(fd);
 208         }
 209 }
 210
 211 static void in_evdev_free(void *drv_data)
 212 {
 213         in_evdev_t *dev = drv_data;
 214         if (dev == NULL)
 215                 return;
 216         close(dev->fd);
 217         free(dev);
 218 }
 219
 220 static int in_evdev_get_bind_count(void)
 221 {
 222         return KEY_CNT;
 223 }
 224
 225 static void or_binds(const int *binds, int key, int *result)
 226 {
 227         int t;
 228         for (t = 0; t < IN_BINDTYPE_COUNT; t++)
 229                 result[t] |= binds[IN_BIND_OFFS(key, t)];
 230 }
 231
 232 /* ORs result with binds of pressed buttons
 233  * XXX: should measure performance hit of this func, might need to optimize */
 234 int in_evdev_update(void *drv_data, const int *binds, int *result)
 235 {
 236         struct input_event ev[16];
 237         struct input_absinfo ainfo;
 238         int keybits[KEY_CNT / sizeof(int)];
 239         in_evdev_t *dev = drv_data;
 240         int rd, ret, u;
 241
 242         while (1) {
 243                 rd = read(dev->fd, ev, sizeof(ev));
 244                 if (rd < (int)sizeof(ev[0])) {
 245                         if (errno != EAGAIN)
 246                                 perror("in_evdev: read failed");
 247                         break;
 248                 }
 249         }
 250
 251         ret = ioctl(dev->fd, EVIOCGKEY(sizeof(keybits)), keybits);
 252         if (ret == -1) {
 253                 perror("in_evdev: ioctl failed");
 254                 return -1;
 255         }
 256
 257         for (u = 0; u < KEY_CNT; u++) {
 258                 if (KEYBITS_BIT(u))
 259                         or_binds(binds, u, result);
 260         }
 261
 262         /* map X and Y absolute to UDLR */
 263         if (dev->abs_lzone != 0) {
 264                 ret = ioctl(dev->fd, EVIOCGABS(ABS_X), &ainfo);
 265                 if (ret != -1) {
 266                         if (ainfo.value < dev->abs_lzone) or_binds(binds, KEY_LEFT, result);
 267                         if (ainfo.value > dev->abs_rzone) or_binds(binds, KEY_RIGHT, result);
 268                 }
 269         }
 270         if (dev->abs_tzone != 0) {
 271                 ret = ioctl(dev->fd, EVIOCGABS(ABS_Y), &ainfo);
 272                 if (ret != -1) {
 273                         if (ainfo.value < dev->abs_tzone) or_binds(binds, KEY_UP, result);
 274                         if (ainfo.value > dev->abs_bzone) or_binds(binds, KEY_DOWN, result);
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 static void in_evdev_set_blocking(void *drv_data, int y)
 282 {
 283         in_evdev_t *dev = drv_data;
 284         long flags;
 285         int ret;
 286
 287         flags = (long)fcntl(dev->fd, F_GETFL);
 288         if ((int)flags == -1) {
 289                 perror("in_evdev: F_GETFL fcntl failed");
 290                 return;
 291         }
 292         if (y)
 293                 flags &= ~O_NONBLOCK;
 294         else
 295                 flags |=  O_NONBLOCK;
 296         ret = fcntl(dev->fd, F_SETFL, flags);
 297         if (ret == -1)
 298                 perror("in_evdev: F_SETFL fcntl failed");
 299 }
 300
 301 static int in_evdev_update_keycode(void *data, int *is_down)
 302 {
 303         in_evdev_t *dev = data;
 304         struct input_event ev;
 305         int rd;
 306
 307         if (is_down != NULL)
 308                 *is_down = 0;
 309
 310         rd = read(dev->fd, &ev, sizeof(ev));
 311         if (rd < (int) sizeof(ev)) {
 312                 if (errno != EAGAIN) {
 313                         perror("in_evdev: error reading");
 314                         sleep(1);
 315                 }
 316                 return -1;
 317         }
 318
 319         if (ev.type == EV_KEY) {
 320                 if (ev.value < 0 || ev.value > 1)
 321                         return -1;
 322                 if (is_down != NULL)
 323                         *is_down = ev.value;
 324                 return ev.code;
 325         }
 326         else if (ev.type == EV_ABS)
 327         {
 328                 int down = 0;
 329                 if (dev->abs_lzone != 0 && ev.code == ABS_X) {
 330                         if (ev.value < dev->abs_lzone) {
 331                                 down = 1;
 332                                 dev->abs_lastx = KEY_LEFT;
 333                         }
 334                         else if (ev.value > dev->abs_rzone) {
 335                                 down = 1;
 336                                 dev->abs_lastx = KEY_RIGHT;
 337                         }
 338                         if (is_down != NULL)
 339                                 *is_down = down;
 340                         return dev->abs_lastx;
 341                 }
 342                 if (dev->abs_tzone != 0 && ev.code == ABS_Y) {
 343                         if (ev.value < dev->abs_tzone) {
 344                                 down = 1;
 345                                 dev->abs_lasty = KEY_UP;
 346                         }
 347                         else if (ev.value > dev->abs_bzone) {
 348                                 down = 1;
 349                                 dev->abs_lasty = KEY_DOWN;
 350                         }
 351                         if (is_down != NULL)
 352                                 *is_down = down;
 353                         return dev->abs_lasty;
 354                 }
 355         }
 356
 357         return -1;
 358 }
 359
 360 static const struct {
 361         short key;
 362         short pbtn;
 363 } key_pbtn_map[] =
 364 {
 365         { KEY_UP,       PBTN_UP },
 366         { KEY_DOWN,     PBTN_DOWN },
 367         { KEY_LEFT,     PBTN_LEFT },
 368         { KEY_RIGHT,    PBTN_RIGHT },
 369         { KEY_ENTER,    PBTN_MOK },
 370         { BTN_A,        PBTN_MOK },
 371         { BTN_TRIGGER,  PBTN_MOK },
 372         { KEY_ESC,      PBTN_MBACK },
 373         { BTN_B,        PBTN_MBACK },
 374         { BTN_THUMB,    PBTN_MBACK },
 375         { KEY_A,        PBTN_MA2 },
 376         { KEY_S,        PBTN_MA3 },
 377         { KEY_BACKSLASH,  PBTN_MENU },
 378         { KEY_MENU,       PBTN_MENU },
 379         { KEY_LEFTBRACE,  PBTN_L },
 380         { KEY_RIGHTBRACE, PBTN_R },
 381 };
 382
 383 #define KEY_PBTN_MAP_SIZE (sizeof(key_pbtn_map) / sizeof(key_pbtn_map[0]))
 384
 385 static int in_evdev_menu_translate(int keycode)
 386 {
 387         int i;
 388         if (keycode < 0)
 389         {
 390                 /* menu -> kc */
 391                 keycode = -keycode;
 392                 for (i = 0; i < KEY_PBTN_MAP_SIZE; i++)
 393                         if (key_pbtn_map[i].pbtn == keycode)
 394                                 return key_pbtn_map[i].key;
 395         }
 396         else
 397         {
 398                 for (i = 0; i < KEY_PBTN_MAP_SIZE; i++)
 399                         if (key_pbtn_map[i].key == keycode)
 400                                 return key_pbtn_map[i].pbtn;
 401         }
 402
 403         return 0;
 404 }
 405
 406 static int in_evdev_get_key_code(const char *key_name)
 407 {
 408         int i;
 409
 410         for (i = 0; i < KEY_CNT; i++) {
 411                 const char *k = in_evdev_keys[i];
 412                 if (k != NULL && strcasecmp(k, key_name) == 0)
 413                         return i;
 414         }
 415
 416         return -1;
 417 }
 418
 419 static const char *in_evdev_get_key_name(int keycode)
 420 {
 421         const char *name = NULL;
 422         if (keycode >= 0 && keycode <= KEY_MAX)
 423                 name = in_evdev_keys[keycode];
 424         if (name == NULL)
 425                 name = "Unkn";
 426
 427         return name;
 428 }
 429
 430 static const struct {
 431         short code;
 432         char btype;
 433         char bit;
 434 } in_evdev_def_binds[] =
 435 {
 436         /* MXYZ SACB RLDU */
 437         { KEY_UP,       IN_BINDTYPE_PLAYER12, 0 },
 438         { KEY_DOWN,     IN_BINDTYPE_PLAYER12, 1 },
 439         { KEY_LEFT,     IN_BINDTYPE_PLAYER12, 2 },
 440         { KEY_RIGHT,    IN_BINDTYPE_PLAYER12, 3 },
 441         { KEY_S,        IN_BINDTYPE_PLAYER12, 4 },      /* B */
 442         { BTN_B,        IN_BINDTYPE_PLAYER12, 4 },
 443         { KEY_D,        IN_BINDTYPE_PLAYER12, 5 },      /* C */
 444         { BTN_A,        IN_BINDTYPE_PLAYER12, 5 },
 445         { KEY_A,        IN_BINDTYPE_PLAYER12, 6 },      /* A */
 446         { BTN_Y,        IN_BINDTYPE_PLAYER12, 6 },
 447         { KEY_ENTER,    IN_BINDTYPE_PLAYER12, 7 },
 448         { BTN_START,    IN_BINDTYPE_PLAYER12, 7 },
 449         { BTN_TL,       IN_BINDTYPE_EMU, PEVB_STATE_LOAD },
 450         { BTN_TR,       IN_BINDTYPE_EMU, PEVB_STATE_SAVE },
 451 };
 452
 453 #define DEF_BIND_COUNT (sizeof(in_evdev_def_binds) / sizeof(in_evdev_def_binds[0]))
 454
 455 static void in_evdev_get_def_binds(int *binds)
 456 {
 457         int i;
 458
 459         for (i = 0; i < DEF_BIND_COUNT; i++)
 460                 binds[IN_BIND_OFFS(in_evdev_def_binds[i].code, in_evdev_def_binds[i].btype)] =
 461                         1 << in_evdev_def_binds[i].bit;
 462 }
 463
 464 /* remove binds of missing keys, count remaining ones */
 465 static int in_evdev_clean_binds(void *drv_data, int *binds, int *def_binds)
 466 {
 467         int keybits[KEY_CNT / sizeof(int)];
 468         in_evdev_t *dev = drv_data;
 469         int i, t, ret, offs, count = 0;
 470
 471         ret = ioctl(dev->fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
 472         if (ret == -1) {
 473                 perror("in_evdev: ioctl failed");
 474                 memset(keybits, 0xff, sizeof(keybits)); /* mark all as good */
 475         }
 476
 477         if (dev->abs_lzone != 0) {
 478                 KEYBITS_BIT_SET(KEY_LEFT);
 479                 KEYBITS_BIT_SET(KEY_RIGHT);
 480         }
 481         if (dev->abs_tzone != 0) {
 482                 KEYBITS_BIT_SET(KEY_UP);
 483                 KEYBITS_BIT_SET(KEY_DOWN);
 484         }
 485
 486         for (i = 0; i < KEY_CNT; i++) {
 487                 for (t = 0; t < IN_BINDTYPE_COUNT; t++) {
 488                         offs = IN_BIND_OFFS(i, t);
 489                         if (!KEYBITS_BIT(i))
 490                                 binds[offs] = def_binds[offs] = 0;
 491                         if (binds[offs])
 492                                 count++;
 493                 }
 494         }
 495
 496         return count;
 497 }
 498
 499 void in_evdev_init(void *vdrv)
 500 {
 501         in_drv_t *drv = vdrv;
 502
 503         drv->prefix = in_evdev_prefix;
 504         drv->probe = in_evdev_probe;
 505         drv->free = in_evdev_free;
 506         drv->get_bind_count = in_evdev_get_bind_count;
 507         drv->get_def_binds = in_evdev_get_def_binds;
 508         drv->clean_binds = in_evdev_clean_binds;
 509         drv->set_blocking = in_evdev_set_blocking;
 510         drv->update_keycode = in_evdev_update_keycode;
 511         drv->menu_translate = in_evdev_menu_translate;
 512         drv->get_key_code = in_evdev_get_key_code;
 513         drv->get_key_name = in_evdev_get_key_name;
 514 }
 515