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