src/evdev.c

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of the copyright holders not be used in
   9  * advertising or publicity pertaining to distribution of the software
  10  * without specific, written prior permission.  The copyright holders make
  11  * no representations about the suitability of this software for any
  12  * purpose.  It is provided "as is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  15  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  16  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  17  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  18  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  19  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  20  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <linux/input.h>
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30 #include <mtdev.h>
  31
  32 #include "compositor.h"
  33 #include "evdev.h"
  34
  35 #define DEFAULT_AXIS_STEP_DISTANCE wl_fixed_from_int(10)
  36
  37 void
  38 evdev_led_update(struct evdev_device *device, enum weston_led leds)
  39 {
  40         static const struct {
  41                 enum weston_led weston;
  42                 int evdev;
  43         } map[] = {
  44                 { LED_NUM_LOCK, LED_NUML },
  45                 { LED_CAPS_LOCK, LED_CAPSL },
  46                 { LED_SCROLL_LOCK, LED_SCROLLL },
  47         };
  48         struct input_event ev[ARRAY_LENGTH(map)];
  49         unsigned int i;
  50
  51         if (!device->caps & EVDEV_KEYBOARD)
  52                 return;
  53
  54         memset(ev, 0, sizeof(ev));
  55         for (i = 0; i < ARRAY_LENGTH(map); i++) {
  56                 ev[i].type = EV_LED;
  57                 ev[i].code = map[i].evdev;
  58                 ev[i].value = !!(leds & map[i].weston);
  59         }
  60
  61         i = write(device->fd, ev, sizeof ev);
  62         (void)i; /* no, we really don't care about the return value */
  63 }
  64
  65 static inline void
  66 evdev_process_key(struct evdev_device *device, struct input_event *e, int time)
  67 {
  68         if (e->value == 2)
  69                 return;
  70
  71         switch (e->code) {
  72         case BTN_LEFT:
  73         case BTN_RIGHT:
  74         case BTN_MIDDLE:
  75         case BTN_SIDE:
  76         case BTN_EXTRA:
  77         case BTN_FORWARD:
  78         case BTN_BACK:
  79         case BTN_TASK:
  80                 notify_button(device->seat,
  81                               time, e->code,
  82                               e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
  83                                          WL_POINTER_BUTTON_STATE_RELEASED);
  84                 break;
  85
  86         case BTN_TOUCH:
  87                 if (e->value == 0 && !device->is_mt)
  88                         notify_touch(device->seat, time, device->mt.slot, 0, 0,
  89                                      WL_TOUCH_UP);
  90                 break;
  91         default:
  92                 notify_key(device->seat,
  93                            time, e->code,
  94                            e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
  95                                       WL_KEYBOARD_KEY_STATE_RELEASED,
  96                            STATE_UPDATE_AUTOMATIC);
  97                 break;
  98         }
  99 }
 100
 101 static void
 102 evdev_process_touch(struct evdev_device *device, struct input_event *e)
 103 {
 104         const int screen_width = device->output->current->width;
 105         const int screen_height = device->output->current->height;
 106
 107         switch (e->code) {
 108         case ABS_MT_SLOT:
 109                 device->mt.slot = e->value;
 110                 break;
 111         case ABS_MT_TRACKING_ID:
 112                 if (e->value >= 0)
 113                         device->pending_events |= EVDEV_ABSOLUTE_MT_DOWN;
 114                 else
 115                         device->pending_events |= EVDEV_ABSOLUTE_MT_UP;
 116                 break;
 117         case ABS_MT_POSITION_X:
 118                 device->mt.x[device->mt.slot] =
 119                         (e->value - device->abs.min_x) * screen_width /
 120                         (device->abs.max_x - device->abs.min_x);
 121                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 122                 break;
 123         case ABS_MT_POSITION_Y:
 124                 device->mt.y[device->mt.slot] =
 125                         (e->value - device->abs.min_y) * screen_height /
 126                         (device->abs.max_y - device->abs.min_y);
 127                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 128                 break;
 129         }
 130 }
 131
 132 static inline void
 133 evdev_process_absolute_motion(struct evdev_device *device,
 134                               struct input_event *e)
 135 {
 136         const int screen_width = device->output->current->width;
 137         const int screen_height = device->output->current->height;
 138
 139         switch (e->code) {
 140         case ABS_X:
 141                 device->abs.x =
 142                         (e->value - device->abs.min_x) * screen_width /
 143                         (device->abs.max_x - device->abs.min_x);
 144                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 145                 break;
 146         case ABS_Y:
 147                 device->abs.y =
 148                         (e->value - device->abs.min_y) * screen_height /
 149                         (device->abs.max_y - device->abs.min_y);
 150                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 151                 break;
 152         }
 153 }
 154
 155 static inline void
 156 evdev_process_relative(struct evdev_device *device,
 157                        struct input_event *e, uint32_t time)
 158 {
 159         switch (e->code) {
 160         case REL_X:
 161                 device->rel.dx += wl_fixed_from_int(e->value);
 162                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 163                 break;
 164         case REL_Y:
 165                 device->rel.dy += wl_fixed_from_int(e->value);
 166                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 167                 break;
 168         case REL_WHEEL:
 169                 switch (e->value) {
 170                 case -1:
 171                         /* Scroll down */
 172                 case 1:
 173                         /* Scroll up */
 174                         notify_axis(device->seat,
 175                                     time,
 176                                     WL_POINTER_AXIS_VERTICAL_SCROLL,
 177                                     -1 * e->value * DEFAULT_AXIS_STEP_DISTANCE);
 178                         break;
 179                 default:
 180                         break;
 181                 }
 182                 break;
 183         case REL_HWHEEL:
 184                 switch (e->value) {
 185                 case -1:
 186                         /* Scroll left */
 187                 case 1:
 188                         /* Scroll right */
 189                         notify_axis(device->seat,
 190                                     time,
 191                                     WL_POINTER_AXIS_HORIZONTAL_SCROLL,
 192                                     e->value * DEFAULT_AXIS_STEP_DISTANCE);
 193                         break;
 194                 default:
 195                         break;
 196
 197                 }
 198         }
 199 }
 200
 201 static inline void
 202 evdev_process_absolute(struct evdev_device *device, struct input_event *e)
 203 {
 204         if (device->is_mt) {
 205                 evdev_process_touch(device, e);
 206         } else {
 207                 evdev_process_absolute_motion(device, e);
 208         }
 209 }
 210
 211 static int
 212 is_motion_event(struct input_event *e)
 213 {
 214         switch (e->type) {
 215         case EV_REL:
 216                 switch (e->code) {
 217                 case REL_X:
 218                 case REL_Y:
 219                         return 1;
 220                 }
 221                 break;
 222         case EV_ABS:
 223                 switch (e->code) {
 224                 case ABS_X:
 225                 case ABS_Y:
 226                 case ABS_MT_POSITION_X:
 227                 case ABS_MT_POSITION_Y:
 228                         return 1;
 229                 }
 230         }
 231
 232         return 0;
 233 }
 234
 235 static void
 236 transform_absolute(struct evdev_device *device)
 237 {
 238         int32_t x, y;
 239
 240         if (!device->abs.apply_calibration)
 241                 return;
 242
 243         x = device->abs.x * device->abs.calibration[0] +
 244                 device->abs.y * device->abs.calibration[1] +
 245                 device->abs.calibration[2];
 246
 247         y = device->abs.x * device->abs.calibration[3] +
 248                 device->abs.y * device->abs.calibration[4] +
 249                 device->abs.calibration[5];
 250
 251         device->abs.x = x;
 252         device->abs.y = y;
 253 }
 254
 255 static void
 256 evdev_flush_motion(struct evdev_device *device, uint32_t time)
 257 {
 258         struct weston_seat *master = device->seat;
 259         wl_fixed_t x, y;
 260         int slot;
 261
 262         if (!(device->pending_events & EVDEV_SYN))
 263                 return;
 264
 265         slot = device->mt.slot;
 266         device->pending_events &= ~EVDEV_SYN;
 267         if (device->pending_events & EVDEV_RELATIVE_MOTION) {
 268                 notify_motion(master, time, device->rel.dx, device->rel.dy);
 269                 device->pending_events &= ~EVDEV_RELATIVE_MOTION;
 270                 device->rel.dx = 0;
 271                 device->rel.dy = 0;
 272         }
 273         if (device->pending_events & EVDEV_ABSOLUTE_MT_DOWN) {
 274                 weston_output_transform_coordinate(device->output,
 275                                                    device->mt.x[slot],
 276                                                    device->mt.y[slot],
 277                                                    &x, &y);
 278                 notify_touch(master, time,
 279                              device->mt.slot, x, y, WL_TOUCH_DOWN);
 280                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 281                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 282         }
 283         if (device->pending_events & EVDEV_ABSOLUTE_MT_MOTION) {
 284                 weston_output_transform_coordinate(device->output,
 285                                                    device->mt.x[slot],
 286                                                    device->mt.y[slot],
 287                                                    &x, &y);
 288                 notify_touch(master, time,
 289                              device->mt.slot, x, y, WL_TOUCH_MOTION);
 290                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 291                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 292         }
 293         if (device->pending_events & EVDEV_ABSOLUTE_MT_UP) {
 294                 notify_touch(master, time, device->mt.slot, 0, 0,
 295                              WL_TOUCH_UP);
 296                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_UP;
 297         }
 298         if (device->pending_events & EVDEV_ABSOLUTE_MOTION) {
 299                 transform_absolute(device);
 300                 weston_output_transform_coordinate(device->output,
 301                                                    device->abs.x,
 302                                                    device->abs.y, &x, &y);
 303
 304                 if (device->caps & EVDEV_TOUCH) {
 305                         if (master->num_tp == 0)
 306                                 notify_touch(master, time, 0,
 307                                              x, y, WL_TOUCH_DOWN);
 308                         else
 309                                 notify_touch(master, time, 0,
 310                                              x, y, WL_TOUCH_MOTION);
 311                 } else
 312                         notify_motion_absolute(master, time, x, y);
 313                 device->pending_events &= ~EVDEV_ABSOLUTE_MOTION;
 314         }
 315 }
 316
 317 static void
 318 fallback_process(struct evdev_dispatch *dispatch,
 319                  struct evdev_device *device,
 320                  struct input_event *event,
 321                  uint32_t time)
 322 {
 323         switch (event->type) {
 324         case EV_REL:
 325                 evdev_process_relative(device, event, time);
 326                 break;
 327         case EV_ABS:
 328                 evdev_process_absolute(device, event);
 329                 break;
 330         case EV_KEY:
 331                 evdev_process_key(device, event, time);
 332                 break;
 333         case EV_SYN:
 334                 device->pending_events |= EVDEV_SYN;
 335                 break;
 336         }
 337 }
 338
 339 static void
 340 fallback_destroy(struct evdev_dispatch *dispatch)
 341 {
 342         free(dispatch);
 343 }
 344
 345 struct evdev_dispatch_interface fallback_interface = {
 346         fallback_process,
 347         fallback_destroy
 348 };
 349
 350 static struct evdev_dispatch *
 351 fallback_dispatch_create(void)
 352 {
 353         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 354         if (dispatch == NULL)
 355                 return NULL;
 356
 357         dispatch->interface = &fallback_interface;
 358
 359         return dispatch;
 360 }
 361
 362 static void
 363 evdev_process_events(struct evdev_device *device,
 364                      struct input_event *ev, int count)
 365 {
 366         struct evdev_dispatch *dispatch = device->dispatch;
 367         struct input_event *e, *end;
 368         uint32_t time = 0;
 369
 370         device->pending_events = 0;
 371
 372         e = ev;
 373         end = e + count;
 374         for (e = ev; e < end; e++) {
 375                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 376
 377                 /* we try to minimize the amount of notifications to be
 378                  * forwarded to the compositor, so we accumulate motion
 379                  * events and send as a bunch */
 380                 if (!is_motion_event(e))
 381                         evdev_flush_motion(device, time);
 382
 383                 dispatch->interface->process(dispatch, device, e, time);
 384         }
 385
 386         evdev_flush_motion(device, time);
 387 }
 388
 389 static int
 390 evdev_device_data(int fd, uint32_t mask, void *data)
 391 {
 392         struct weston_compositor *ec;
 393         struct evdev_device *device = data;
 394         struct input_event ev[32];
 395         int len;
 396
 397         ec = device->seat->compositor;
 398         if (!ec->focus)
 399                 return 1;
 400
 401         /* If the compositor is repainting, this function is called only once
 402          * per frame and we have to process all the events available on the
 403          * fd, otherwise there will be input lag. */
 404         do {
 405                 if (device->mtdev)
 406                         len = mtdev_get(device->mtdev, fd, ev,
 407                                         ARRAY_LENGTH(ev)) *
 408                                 sizeof (struct input_event);
 409                 else
 410                         len = read(fd, &ev, sizeof ev);
 411
 412                 if (len < 0 || len % sizeof ev[0] != 0) {
 413                         /* FIXME: call evdev_device_destroy when errno is ENODEV. */
 414                         return 1;
 415                 }
 416
 417                 evdev_process_events(device, ev, len / sizeof ev[0]);
 418
 419         } while (len > 0);
 420
 421         return 1;
 422 }
 423
 424 static int
 425 evdev_handle_device(struct evdev_device *device)
 426 {
 427         struct input_absinfo absinfo;
 428         unsigned long ev_bits[NBITS(EV_MAX)];
 429         unsigned long abs_bits[NBITS(ABS_MAX)];
 430         unsigned long rel_bits[NBITS(REL_MAX)];
 431         unsigned long key_bits[NBITS(KEY_MAX)];
 432         int has_key, has_abs;
 433         unsigned int i;
 434
 435         has_key = 0;
 436         has_abs = 0;
 437         device->caps = 0;
 438
 439         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 440         if (TEST_BIT(ev_bits, EV_ABS)) {
 441                 has_abs = 1;
 442
 443                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 444                       abs_bits);
 445                 if (TEST_BIT(abs_bits, ABS_X)) {
 446                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 447                         device->abs.min_x = absinfo.minimum;
 448                         device->abs.max_x = absinfo.maximum;
 449                         device->caps |= EVDEV_MOTION_ABS;
 450                 }
 451                 if (TEST_BIT(abs_bits, ABS_Y)) {
 452                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 453                         device->abs.min_y = absinfo.minimum;
 454                         device->abs.max_y = absinfo.maximum;
 455                         device->caps |= EVDEV_MOTION_ABS;
 456                 }
 457                 /* We only handle the slotted Protocol B in weston.
 458                    Devices with ABS_MT_POSITION_* but not ABS_MT_SLOT
 459                    require mtdev for conversion. */
 460                 if (TEST_BIT(abs_bits, ABS_MT_POSITION_X) &&
 461                     TEST_BIT(abs_bits, ABS_MT_POSITION_Y)) {
 462                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_X),
 463                               &absinfo);
 464                         device->abs.min_x = absinfo.minimum;
 465                         device->abs.max_x = absinfo.maximum;
 466                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_Y),
 467                               &absinfo);
 468                         device->abs.min_y = absinfo.minimum;
 469                         device->abs.max_y = absinfo.maximum;
 470                         device->is_mt = 1;
 471                         device->mt.slot = 0;
 472                         device->caps |= EVDEV_TOUCH;
 473                 }
 474         }
 475         if (TEST_BIT(ev_bits, EV_REL)) {
 476                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 477                       rel_bits);
 478                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 479                         device->caps |= EVDEV_MOTION_REL;
 480         }
 481         if (TEST_BIT(ev_bits, EV_KEY)) {
 482                 has_key = 1;
 483                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 484                       key_bits);
 485                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 486                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 487                     has_abs)
 488                         device->dispatch = evdev_touchpad_create(device);
 489                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 490                         if (i >= BTN_MISC && i < KEY_OK)
 491                                 continue;
 492                         if (TEST_BIT(key_bits, i)) {
 493                                 device->caps |= EVDEV_KEYBOARD;
 494                                 break;
 495                         }
 496                 }
 497                 for (i = BTN_MISC; i < KEY_OK; i++) {
 498                         if (TEST_BIT(key_bits, i)) {
 499                                 device->caps |= EVDEV_BUTTON;
 500                                 break;
 501                         }
 502                 }
 503                 if (TEST_BIT(key_bits, BTN_TOUCH)) {
 504                         device->caps |= EVDEV_TOUCH;
 505                 }
 506
 507         }
 508         if (TEST_BIT(ev_bits, EV_LED)) {
 509                 device->caps |= EVDEV_KEYBOARD;
 510         }
 511
 512         /* This rule tries to catch accelerometer devices and opt out. We may
 513          * want to adjust the protocol later adding a proper event for dealing
 514          * with accelerometers and implement here accordingly */
 515         if (has_abs && !has_key && !device->is_mt) {
 516                 weston_log("input device %s, %s "
 517                            "ignored: unsupported device type\n",
 518                            device->devname, device->devnode);
 519                 return 0;
 520         }
 521
 522         return 1;
 523 }
 524
 525 static int
 526 evdev_configure_device(struct evdev_device *device)
 527 {
 528         if ((device->caps &
 529              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON))) {
 530                 weston_seat_init_pointer(device->seat);
 531                 weston_log("input device %s, %s is a pointer caps =%s%s%s\n",
 532                            device->devname, device->devnode,
 533                            device->caps & EVDEV_MOTION_ABS ? " absolute-motion" : "",
 534                            device->caps & EVDEV_MOTION_REL ? " relative-motion": "",
 535                            device->caps & EVDEV_BUTTON ? " button" : "");
 536         }
 537         if ((device->caps & EVDEV_KEYBOARD)) {
 538                 if (weston_seat_init_keyboard(device->seat, NULL) < 0)
 539                         return -1;
 540                 weston_log("input device %s, %s is a keyboard\n",
 541                            device->devname, device->devnode);
 542         }
 543         if ((device->caps & EVDEV_TOUCH)) {
 544                 weston_seat_init_touch(device->seat);
 545                 weston_log("input device %s, %s is a touch device\n",
 546                            device->devname, device->devnode);
 547         }
 548
 549         return 0;
 550 }
 551
 552 struct evdev_device *
 553 evdev_device_create(struct weston_seat *seat, const char *path, int device_fd)
 554 {
 555         struct evdev_device *device;
 556         struct weston_compositor *ec;
 557         char devname[256] = "unknown";
 558
 559         device = zalloc(sizeof *device);
 560         if (device == NULL)
 561                 return NULL;
 562
 563         ec = seat->compositor;
 564         device->output =
 565                 container_of(ec->output_list.next, struct weston_output, link);
 566
 567         device->seat = seat;
 568         device->is_mt = 0;
 569         device->mtdev = NULL;
 570         device->devnode = strdup(path);
 571         device->mt.slot = -1;
 572         device->rel.dx = 0;
 573         device->rel.dy = 0;
 574         device->dispatch = NULL;
 575         device->fd = device_fd;
 576
 577         ioctl(device->fd, EVIOCGNAME(sizeof(devname)), devname);
 578         devname[sizeof(devname) - 1] = '\0';
 579         device->devname = strdup(devname);
 580
 581         if (!evdev_handle_device(device)) {
 582                 free(device->devnode);
 583                 free(device->devname);
 584                 free(device);
 585                 return EVDEV_UNHANDLED_DEVICE;
 586         }
 587
 588         if (evdev_configure_device(device) == -1)
 589                 goto err1;
 590
 591         /* If the dispatch was not set up use the fallback. */
 592         if (device->dispatch == NULL)
 593                 device->dispatch = fallback_dispatch_create();
 594         if (device->dispatch == NULL)
 595                 goto err1;
 596
 597
 598         if (device->is_mt) {
 599                 device->mtdev = mtdev_new_open(device->fd);
 600                 if (!device->mtdev)
 601                         weston_log("mtdev failed to open for %s\n", path);
 602         }
 603
 604         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 605                                               WL_EVENT_READABLE,
 606                                               evdev_device_data, device);
 607         if (device->source == NULL)
 608                 goto err2;
 609
 610         return device;
 611
 612 err2:
 613         device->dispatch->interface->destroy(device->dispatch);
 614 err1:
 615         free(device->devname);
 616         free(device->devnode);
 617         free(device);
 618         return NULL;
 619 }
 620
 621 void
 622 evdev_device_destroy(struct evdev_device *device)
 623 {
 624         struct evdev_dispatch *dispatch;
 625
 626         dispatch = device->dispatch;
 627         if (dispatch)
 628                 dispatch->interface->destroy(dispatch);
 629
 630         wl_event_source_remove(device->source);
 631         wl_list_remove(&device->link);
 632         if (device->mtdev)
 633                 mtdev_close_delete(device->mtdev);
 634         close(device->fd);
 635         free(device->devname);
 636         free(device->devnode);
 637         free(device);
 638 }
 639
 640 void
 641 evdev_notify_keyboard_focus(struct weston_seat *seat,
 642                             struct wl_list *evdev_devices)
 643 {
 644         struct evdev_device *device;
 645         struct wl_array keys;
 646         unsigned int i, set;
 647         char evdev_keys[(KEY_CNT + 7) / 8];
 648         char all_keys[(KEY_CNT + 7) / 8];
 649         uint32_t *k;
 650         int ret;
 651
 652         if (!seat->keyboard)
 653                 return;
 654
 655         memset(all_keys, 0, sizeof all_keys);
 656         wl_list_for_each(device, evdev_devices, link) {
 657                 memset(evdev_keys, 0, sizeof evdev_keys);
 658                 ret = ioctl(device->fd,
 659                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 660                 if (ret < 0) {
 661                         weston_log("failed to get keys for device %s\n",
 662                                 device->devnode);
 663                         continue;
 664                 }
 665                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 666                         all_keys[i] |= evdev_keys[i];
 667         }
 668
 669         wl_array_init(&keys);
 670         for (i = 0; i < KEY_CNT; i++) {
 671                 set = all_keys[i >> 3] & (1 << (i & 7));
 672                 if (set) {
 673                         k = wl_array_add(&keys, sizeof *k);
 674                         *k = i;
 675                 }
 676         }
 677
 678         notify_keyboard_focus_in(seat, &keys, STATE_UPDATE_AUTOMATIC);
 679
 680         wl_array_release(&keys);
 681 }