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