linux/in_evdev.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <fcntl.h>
   6 #include <sys/ioctl.h>
   7 #include <unistd.h>
   8 #include <linux/input.h>
   9 #include <errno.h>
  10
  11 #include "../common/common.h"
  12 #include "../common/input.h"
  13 #include "in_evdev.h"
  14
  15 #define KEYBITS_BIT(x) (keybits[(x)/sizeof(keybits[0])/8] & \
  16         (1 << ((x) & (sizeof(keybits[0])*8-1))))
  17
  18 static const char * const in_evdev_prefix = "evdev:";
  19 static const char * const in_evdev_keys[KEY_MAX + 1] = {
  20         [0 ... KEY_MAX] = NULL,
  21         [KEY_RESERVED] = "Reserved",            [KEY_ESC] = "Esc",
  22         [KEY_1] = "1",                          [KEY_2] = "2",
  23         [KEY_3] = "3",                          [KEY_4] = "4",
  24         [KEY_5] = "5",                          [KEY_6] = "6",
  25         [KEY_7] = "7",                          [KEY_8] = "8",
  26         [KEY_9] = "9",                          [KEY_0] = "0",
  27         [KEY_MINUS] = "Minus",                  [KEY_EQUAL] = "Equal",
  28         [KEY_BACKSPACE] = "Backspace",          [KEY_TAB] = "Tab",
  29         [KEY_Q] = "Q",                          [KEY_W] = "W",
  30         [KEY_E] = "E",                          [KEY_R] = "R",
  31         [KEY_T] = "T",                          [KEY_Y] = "Y",
  32         [KEY_U] = "U",                          [KEY_I] = "I",
  33         [KEY_O] = "O",                          [KEY_P] = "P",
  34         [KEY_LEFTBRACE] = "LeftBrace",          [KEY_RIGHTBRACE] = "RightBrace",
  35         [KEY_ENTER] = "Enter",                  [KEY_LEFTCTRL] = "LeftControl",
  36         [KEY_A] = "A",                          [KEY_S] = "S",
  37         [KEY_D] = "D",                          [KEY_F] = "F",
  38         [KEY_G] = "G",                          [KEY_H] = "H",
  39         [KEY_J] = "J",                          [KEY_K] = "K",
  40         [KEY_L] = "L",                          [KEY_SEMICOLON] = "Semicolon",
  41         [KEY_APOSTROPHE] = "Apostrophe",        [KEY_GRAVE] = "Grave",
  42         [KEY_LEFTSHIFT] = "LeftShift",          [KEY_BACKSLASH] = "BackSlash",
  43         [KEY_Z] = "Z",                          [KEY_X] = "X",
  44         [KEY_C] = "C",                          [KEY_V] = "V",
  45         [KEY_B] = "B",                          [KEY_N] = "N",
  46         [KEY_M] = "M",                          [KEY_COMMA] = "Comma",
  47         [KEY_DOT] = "Dot",                      [KEY_SLASH] = "Slash",
  48         [KEY_RIGHTSHIFT] = "RightShift",        [KEY_KPASTERISK] = "KPAsterisk",
  49         [KEY_LEFTALT] = "LeftAlt",              [KEY_SPACE] = "Space",
  50         [KEY_CAPSLOCK] = "CapsLock",            [KEY_F1] = "F1",
  51         [KEY_F2] = "F2",                        [KEY_F3] = "F3",
  52         [KEY_F4] = "F4",                        [KEY_F5] = "F5",
  53         [KEY_F6] = "F6",                        [KEY_F7] = "F7",
  54         [KEY_F8] = "F8",                        [KEY_F9] = "F9",
  55         [KEY_F10] = "F10",                      [KEY_NUMLOCK] = "NumLock",
  56         [KEY_SCROLLLOCK] = "ScrollLock",        [KEY_KP7] = "KP7",
  57         [KEY_KP8] = "KP8",                      [KEY_KP9] = "KP9",
  58         [KEY_KPMINUS] = "KPMinus",              [KEY_KP4] = "KP4",
  59         [KEY_KP5] = "KP5",                      [KEY_KP6] = "KP6",
  60         [KEY_KPPLUS] = "KPPlus",                [KEY_KP1] = "KP1",
  61         [KEY_KP2] = "KP2",                      [KEY_KP3] = "KP3",
  62         [KEY_KP0] = "KP0",                      [KEY_KPDOT] = "KPDot",
  63         [KEY_ZENKAKUHANKAKU] = "Zenkaku/Hankaku", [KEY_102ND] = "102nd",
  64         [KEY_F11] = "F11",                      [KEY_F12] = "F12",
  65         [KEY_KPJPCOMMA] = "KPJpComma",          [KEY_KPENTER] = "KPEnter",
  66         [KEY_RIGHTCTRL] = "RightCtrl",          [KEY_KPSLASH] = "KPSlash",
  67         [KEY_SYSRQ] = "SysRq",                  [KEY_RIGHTALT] = "RightAlt",
  68         [KEY_LINEFEED] = "LineFeed",            [KEY_HOME] = "Home",
  69         [KEY_UP] = "Up",                        [KEY_PAGEUP] = "PageUp",
  70         [KEY_LEFT] = "Left",                    [KEY_RIGHT] = "Right",
  71         [KEY_END] = "End",                      [KEY_DOWN] = "Down",
  72         [KEY_PAGEDOWN] = "PageDown",            [KEY_INSERT] = "Insert",
  73         [KEY_DELETE] = "Delete",                [KEY_MACRO] = "Macro",
  74         [KEY_HELP] = "Help",                    [KEY_MENU] = "Menu",
  75         [KEY_COFFEE] = "Coffee",                [KEY_DIRECTION] = "Direction",
  76         [BTN_0] = "Btn0",                       [BTN_1] = "Btn1",
  77         [BTN_2] = "Btn2",                       [BTN_3] = "Btn3",
  78         [BTN_4] = "Btn4",                       [BTN_5] = "Btn5",
  79         [BTN_6] = "Btn6",                       [BTN_7] = "Btn7",
  80         [BTN_8] = "Btn8",                       [BTN_9] = "Btn9",
  81         [BTN_LEFT] = "LeftBtn",                 [BTN_RIGHT] = "RightBtn",
  82         [BTN_MIDDLE] = "MiddleBtn",             [BTN_SIDE] = "SideBtn",
  83         [BTN_EXTRA] = "ExtraBtn",               [BTN_FORWARD] = "ForwardBtn",
  84         [BTN_BACK] = "BackBtn",                 [BTN_TASK] = "TaskBtn",
  85         [BTN_TRIGGER] = "Trigger",              [BTN_THUMB] = "ThumbBtn",
  86         [BTN_THUMB2] = "ThumbBtn2",             [BTN_TOP] = "TopBtn",
  87         [BTN_TOP2] = "TopBtn2",                 [BTN_PINKIE] = "PinkieBtn",
  88         [BTN_BASE] = "BaseBtn",                 [BTN_BASE2] = "BaseBtn2",
  89         [BTN_BASE3] = "BaseBtn3",               [BTN_BASE4] = "BaseBtn4",
  90         [BTN_BASE5] = "BaseBtn5",               [BTN_BASE6] = "BaseBtn6",
  91         [BTN_DEAD] = "BtnDead",                 [BTN_A] = "BtnA",
  92         [BTN_B] = "BtnB",                       [BTN_C] = "BtnC",
  93         [BTN_X] = "BtnX",                       [BTN_Y] = "BtnY",
  94         [BTN_Z] = "BtnZ",                       [BTN_TL] = "BtnTL",
  95         [BTN_TR] = "BtnTR",                     [BTN_TL2] = "BtnTL2",
  96         [BTN_TR2] = "BtnTR2",                   [BTN_SELECT] = "BtnSelect",
  97         [BTN_START] = "BtnStart",               [BTN_MODE] = "BtnMode",
  98         [BTN_THUMBL] = "BtnThumbL",             [BTN_THUMBR] = "BtnThumbR",
  99         [BTN_TOUCH] = "Touch",                  [BTN_STYLUS] = "Stylus",
 100         [BTN_STYLUS2] = "Stylus2",              [BTN_TOOL_DOUBLETAP] = "Tool Doubletap",
 101         [BTN_TOOL_TRIPLETAP] = "Tool Tripletap", [BTN_GEAR_DOWN] = "WheelBtn",
 102         [BTN_GEAR_UP] = "Gear up",              [KEY_OK] = "Ok",
 103 };
 104
 105
 106 static void in_evdev_probe(void)
 107 {
 108         int i;
 109
 110         for (i = 0;; i++)
 111         {
 112                 int u, ret, fd, keybits[(KEY_MAX+1)/sizeof(int)];
 113                 int support = 0, count = 0;
 114                 char name[64];
 115
 116                 snprintf(name, sizeof(name), "/dev/input/event%d", i);
 117                 fd = open(name, O_RDONLY|O_NONBLOCK);
 118                 if (fd == -1)
 119                         break;
 120
 121                 /* check supported events */
 122                 ret = ioctl(fd, EVIOCGBIT(0, sizeof(support)), &support);
 123                 if (ret == -1) {
 124                         printf("in_evdev: ioctl failed on %s\n", name);
 125                         goto skip;
 126                 }
 127
 128                 if (!(support & (1 << EV_KEY)))
 129                         goto skip;
 130
 131                 ret = ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
 132                 if (ret == -1) {
 133                         printf("in_evdev: ioctl failed on %s\n", name);
 134                         goto skip;
 135                 }
 136
 137                 /* check for interesting keys */
 138                 for (u = 0; u < KEY_MAX + 1; u++) {
 139                         if (KEYBITS_BIT(u) && u != KEY_POWER && u != KEY_SLEEP)
 140                                 count++;
 141                 }
 142
 143                 if (count == 0)
 144                         goto skip;
 145
 146                 strcpy(name, in_evdev_prefix);
 147                 ioctl(fd, EVIOCGNAME(sizeof(name)-6), name+6);
 148                 printf("in_evdev: found \"%s\" with %d events (type %08x)\n",
 149                         name+6, count, support);
 150                 in_register(name, IN_DRVID_EVDEV, (void *)fd);
 151                 continue;
 152
 153 skip:
 154                 close(fd);
 155         }
 156 }
 157
 158 static void in_evdev_free(void *drv_data)
 159 {
 160         close((int)drv_data);
 161 }
 162
 163 static int in_evdev_get_bind_count(void)
 164 {
 165         return KEY_MAX + 1;
 166 }
 167
 168 /* returns bitfield of active binds or -1 if nothing
 169  * changed from previous time */
 170 int in_evdev_update(void *drv_data, int *binds)
 171 {
 172         struct input_event ev[16];
 173         int keybits[(KEY_MAX+1)/sizeof(int)];
 174         int fd = (int)drv_data;
 175         int result = 0, changed = 0;
 176         int rd, ret, u;
 177
 178         while (1) {
 179                 rd = read(fd, ev, sizeof(ev));
 180                 if (rd < (int)sizeof(ev[0])) {
 181                         if (errno != EAGAIN)
 182                                 perror("in_evdev: read failed");
 183                         break;
 184                 }
 185
 186                 changed = 1;
 187         }
 188
 189         if (!changed)
 190                 return -1;
 191
 192         ret = ioctl(fd, EVIOCGKEY(sizeof(keybits)), keybits);
 193         if (ret == -1) {
 194                 perror("in_evdev: ioctl failed");
 195                 return 0;
 196         }
 197
 198         for (u = 0; u < KEY_MAX + 1; u++) {
 199                 if (KEYBITS_BIT(u)) {
 200                         result |= binds[u];
 201                 }
 202         }
 203
 204         return result;
 205 }
 206
 207 static void in_evdev_set_blocking(void *data, int y)
 208 {
 209         long flags;
 210         int ret;
 211
 212         flags = (long)fcntl((int)data, F_GETFL);
 213         if ((int)flags == -1) {
 214                 perror("in_evdev: F_GETFL fcntl failed");
 215                 return;
 216         }
 217         if (y)
 218                 flags &= ~O_NONBLOCK;
 219         else
 220                 flags |=  O_NONBLOCK;
 221         ret = fcntl((int)data, F_SETFL, flags);
 222         if (ret == -1)
 223                 perror("in_evdev: F_SETFL fcntl failed");
 224 }
 225
 226 int in_evdev_update_keycode(void **data, int dcount, int *which, int *is_down, int timeout_ms)
 227 {
 228         const int *fds = (const int *)data;
 229         struct timeval tv, *timeout = NULL;
 230         int i, fdmax = -1;
 231
 232         if (timeout_ms > 0) {
 233                 tv.tv_sec = timeout_ms / 1000;
 234                 tv.tv_usec = (timeout_ms % 1000) * 1000;
 235                 timeout = &tv;
 236         }
 237
 238         if (is_down != NULL)
 239                 *is_down = 0;
 240
 241         for (i = 0; i < dcount; i++)
 242                 if (fds[i] > fdmax) fdmax = fds[i];
 243
 244         while (1)
 245         {
 246                 struct input_event ev[64];
 247                 int ret, fd = -1, rd;
 248                 fd_set fdset;
 249
 250                 FD_ZERO(&fdset);
 251                 for (i = 0; i < dcount; i++)
 252                         FD_SET(fds[i], &fdset);
 253
 254                 ret = select(fdmax + 1, &fdset, NULL, NULL, timeout);
 255                 if (ret == -1)
 256                 {
 257                         perror("in_evdev: select failed");
 258                         sleep(1);
 259                         return 0;
 260                 }
 261
 262                 if (ret == 0)
 263                         return 0; /* timeout */
 264
 265                 for (i = 0; i < dcount; i++)
 266                         if (FD_ISSET(fds[i], &fdset))
 267                                 *which = i, fd = fds[i];
 268
 269                 rd = read(fd, ev, sizeof(ev[0]) * 64);
 270                 if (rd < (int) sizeof(ev[0])) {
 271                         perror("in_evdev: error reading");
 272                         sleep(1);
 273                         return 0;
 274                 }
 275
 276                 for (i = 0; i < rd / sizeof(ev[0]); i++)
 277                 {
 278                         if (ev[i].type != EV_KEY || ev[i].value < 0 || ev[i].value > 1)
 279                                 continue;
 280
 281                         if (is_down != NULL)
 282                                 *is_down = ev[i].value;
 283                         return ev[i].code;
 284                 }
 285         }
 286 }
 287
 288 static int in_evdev_menu_translate(int keycode)
 289 {
 290         switch (keycode) {
 291                 /* keyboards */
 292                 case KEY_UP:    return PBTN_UP;
 293                 case KEY_DOWN:  return PBTN_DOWN;
 294                 case KEY_LEFT:  return PBTN_LEFT;
 295                 case KEY_RIGHT: return PBTN_RIGHT;
 296                 case KEY_ENTER: return PBTN_EAST;
 297                 case KEY_ESC:   return PBTN_SOUTH;
 298                 default:        return 0;
 299         }
 300 }
 301
 302 static int in_evdev_get_key_code(const char *key_name)
 303 {
 304         int i;
 305
 306         for (i = 0; i < KEY_MAX + 1; i++) {
 307                 const char *k = in_evdev_keys[i];
 308                 if (k != NULL && k[0] == key_name[0] &&
 309                                 strcasecmp(k, key_name) == 0)
 310                         return i;
 311         }
 312
 313         return -1;
 314 }
 315
 316 static const char *in_evdev_get_key_name(int keycode)
 317 {
 318         const char *name = NULL;
 319         if (keycode >= 0 && keycode <= KEY_MAX)
 320                 name = in_evdev_keys[keycode];
 321         if (name == NULL)
 322                 name = "Unkn";
 323
 324         return name;
 325 }
 326
 327 static const struct {
 328         short code;
 329         short bit;
 330 } in_evdev_def_binds[] =
 331 {
 332         /* MXYZ SACB RLDU */
 333         { KEY_UP,       0 },
 334         { KEY_DOWN,     1 },
 335         { KEY_LEFT,     2 },
 336         { KEY_RIGHT,    3 },
 337         { KEY_S,        4 },    /* B */
 338         { KEY_D,        5 },    /* C */
 339         { KEY_A,        6 },    /* A */
 340         { KEY_ENTER,    7 },
 341 };
 342
 343 #define DEF_BIND_COUNT (sizeof(in_evdev_def_binds) / sizeof(in_evdev_def_binds[0]))
 344
 345 static void in_evdev_get_def_binds(int *binds)
 346 {
 347         int i;
 348
 349         for (i = 0; i < DEF_BIND_COUNT; i++)
 350                 binds[in_evdev_def_binds[i].code] = 1 << in_evdev_def_binds[i].bit;
 351 }
 352
 353 /* remove bad binds, count good ones */
 354 static int in_evdev_clean_binds(void *drv_data, int *binds)
 355 {
 356         int keybits[(KEY_MAX+1)/sizeof(int)];
 357         int i, ret, count = 0;
 358
 359         ret = ioctl((int)drv_data, EVIOCGBIT(EV_KEY, sizeof(keybits)), keybits);
 360         if (ret == -1) {
 361                 perror("in_evdev: ioctl failed");
 362                 memset(keybits, 0xff, sizeof(keybits)); /* mark all as good */
 363         }
 364
 365         for (i = 0; i < KEY_MAX + 1; i++) {
 366                 if (!KEYBITS_BIT(i))
 367                         binds[i] = binds[i + KEY_MAX + 1] = 0;
 368                 if (binds[i])
 369                         count++;
 370         }
 371
 372         return count;
 373 }
 374
 375 void in_evdev_init(void *vdrv)
 376 {
 377         in_drv_t *drv = vdrv;
 378
 379         drv->prefix = in_evdev_prefix;
 380         drv->probe = in_evdev_probe;
 381         drv->free = in_evdev_free;
 382         drv->get_bind_count = in_evdev_get_bind_count;
 383         drv->get_def_binds = in_evdev_get_def_binds;
 384         drv->clean_binds = in_evdev_clean_binds;
 385         drv->set_blocking = in_evdev_set_blocking;
 386         drv->menu_translate = in_evdev_menu_translate;
 387         drv->get_key_code = in_evdev_get_key_code;
 388         drv->get_key_name = in_evdev_get_key_name;
 389 }
 390