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 #include <assert.h>
  32
  33 #include "compositor.h"
  34 #include "evdev.h"
  35
  36 #define DEFAULT_AXIS_STEP_DISTANCE wl_fixed_from_int(10)
  37
  38 void
  39 evdev_led_update(struct evdev_device *device, enum weston_led leds)
  40 {
  41         static const struct {
  42                 enum weston_led weston;
  43                 int evdev;
  44         } map[] = {
  45                 { LED_NUM_LOCK, LED_NUML },
  46                 { LED_CAPS_LOCK, LED_CAPSL },
  47                 { LED_SCROLL_LOCK, LED_SCROLLL },
  48         };
  49         struct input_event ev[ARRAY_LENGTH(map) + 1];
  50         unsigned int i;
  51
  52         if (!device->caps & EVDEV_KEYBOARD)
  53                 return;
  54
  55         memset(ev, 0, sizeof(ev));
  56         for (i = 0; i < ARRAY_LENGTH(map); i++) {
  57                 ev[i].type = EV_LED;
  58                 ev[i].code = map[i].evdev;
  59                 ev[i].value = !!(leds & map[i].weston);
  60         }
  61         ev[i].type = EV_SYN;
  62         ev[i].code = SYN_REPORT;
  63
  64         i = write(device->fd, ev, sizeof ev);
  65         (void)i; /* no, we really don't care about the return value */
  66 }
  67
  68 static void
  69 transform_absolute(struct evdev_device *device, int32_t *x, int32_t *y)
  70 {
  71        if (!device->abs.apply_calibration) {
  72                *x = device->abs.x;
  73                *y = device->abs.y;
  74                return;
  75        } else {
  76                *x = device->abs.x * device->abs.calibration[0] +
  77                        device->abs.y * device->abs.calibration[1] +
  78                        device->abs.calibration[2];
  79
  80                *y = device->abs.x * device->abs.calibration[3] +
  81                        device->abs.y * device->abs.calibration[4] +
  82                        device->abs.calibration[5];
  83        }
  84 }
  85
  86 static void
  87 evdev_flush_pending_event(struct evdev_device *device, uint32_t time)
  88 {
  89         struct weston_seat *master = device->seat;
  90         wl_fixed_t x, y;
  91         int32_t cx, cy;
  92         int slot;
  93
  94         slot = device->mt.slot;
  95
  96         switch (device->pending_event) {
  97         case EVDEV_NONE:
  98                 return;
  99         case EVDEV_RELATIVE_MOTION:
 100                 notify_motion(master, time, device->rel.dx, device->rel.dy);
 101                 device->rel.dx = 0;
 102                 device->rel.dy = 0;
 103                 goto handled;
 104         case EVDEV_ABSOLUTE_MT_DOWN:
 105                 weston_output_transform_coordinate(device->output,
 106                                                    device->mt.slots[slot].x,
 107                                                    device->mt.slots[slot].y,
 108                                                    &x, &y);
 109                 notify_touch(master, time,
 110                              slot, x, y, WL_TOUCH_DOWN);
 111                 goto handled;
 112         case EVDEV_ABSOLUTE_MT_MOTION:
 113                 weston_output_transform_coordinate(device->output,
 114                                                    device->mt.slots[slot].x,
 115                                                    device->mt.slots[slot].y,
 116                                                    &x, &y);
 117                 notify_touch(master, time,
 118                              slot, x, y, WL_TOUCH_MOTION);
 119                 goto handled;
 120         case EVDEV_ABSOLUTE_MT_UP:
 121                 notify_touch(master, time, slot, 0, 0,
 122                              WL_TOUCH_UP);
 123                 goto handled;
 124         case EVDEV_ABSOLUTE_MOTION:
 125                 transform_absolute(device, &cx, &cy);
 126                 weston_output_transform_coordinate(device->output,
 127                                                    cx, cy, &x, &y);
 128
 129                 if (device->caps & EVDEV_TOUCH) {
 130                         if (master->num_tp == 0)
 131                                 notify_touch(master, time, 0,
 132                                              x, y, WL_TOUCH_DOWN);
 133                         else
 134                                 notify_touch(master, time, 0,
 135                                              x, y, WL_TOUCH_MOTION);
 136                 } else
 137                         notify_motion_absolute(master, time, x, y);
 138                 goto handled;
 139         }
 140
 141         assert(0 && "Unknown pending event type");
 142
 143 handled:
 144         device->pending_event = EVDEV_NONE;
 145 }
 146
 147 static inline void
 148 evdev_process_key(struct evdev_device *device, struct input_event *e, int time)
 149 {
 150         /* ignore kernel key repeat */
 151         if (e->value == 2)
 152                 return;
 153
 154         evdev_flush_pending_event(device, time);
 155
 156         switch (e->code) {
 157         case BTN_LEFT:
 158         case BTN_RIGHT:
 159         case BTN_MIDDLE:
 160         case BTN_SIDE:
 161         case BTN_EXTRA:
 162         case BTN_FORWARD:
 163         case BTN_BACK:
 164         case BTN_TASK:
 165                 notify_button(device->seat,
 166                               time, e->code,
 167                               e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
 168                                          WL_POINTER_BUTTON_STATE_RELEASED);
 169                 break;
 170
 171         case BTN_TOUCH:
 172                 if (e->value == 0 && !device->is_mt)
 173                         notify_touch(device->seat, time, 0, 0, 0,
 174                                      WL_TOUCH_UP);
 175                 break;
 176         default:
 177                 notify_key(device->seat,
 178                            time, e->code,
 179                            e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
 180                                       WL_KEYBOARD_KEY_STATE_RELEASED,
 181                            STATE_UPDATE_AUTOMATIC);
 182                 break;
 183         }
 184 }
 185
 186 static void
 187 evdev_process_touch(struct evdev_device *device,
 188                     struct input_event *e,
 189                     uint32_t time)
 190 {
 191         const int screen_width = device->output->current_mode->width;
 192         const int screen_height = device->output->current_mode->height;
 193
 194         switch (e->code) {
 195         case ABS_MT_SLOT:
 196                 evdev_flush_pending_event(device, time);
 197                 device->mt.slot = e->value;
 198                 break;
 199         case ABS_MT_TRACKING_ID:
 200                 if (device->pending_event != EVDEV_NONE &&
 201                     device->pending_event != EVDEV_ABSOLUTE_MT_MOTION)
 202                         evdev_flush_pending_event(device, time);
 203                 if (e->value >= 0)
 204                         device->pending_event = EVDEV_ABSOLUTE_MT_DOWN;
 205                 else
 206                         device->pending_event = EVDEV_ABSOLUTE_MT_UP;
 207                 break;
 208         case ABS_MT_POSITION_X:
 209                 device->mt.slots[device->mt.slot].x =
 210                         (e->value - device->abs.min_x) * screen_width /
 211                         (device->abs.max_x - device->abs.min_x);
 212                 if (device->pending_event == EVDEV_NONE)
 213                         device->pending_event = EVDEV_ABSOLUTE_MT_MOTION;
 214                 break;
 215         case ABS_MT_POSITION_Y:
 216                 device->mt.slots[device->mt.slot].y =
 217                         (e->value - device->abs.min_y) * screen_height /
 218                         (device->abs.max_y - device->abs.min_y);
 219                 if (device->pending_event == EVDEV_NONE)
 220                         device->pending_event = EVDEV_ABSOLUTE_MT_MOTION;
 221                 break;
 222         }
 223 }
 224
 225 static inline void
 226 evdev_process_absolute_motion(struct evdev_device *device,
 227                               struct input_event *e)
 228 {
 229         const int screen_width = device->output->current_mode->width;
 230         const int screen_height = device->output->current_mode->height;
 231
 232         switch (e->code) {
 233         case ABS_X:
 234                 device->abs.x =
 235                         (e->value - device->abs.min_x) * screen_width /
 236                         (device->abs.max_x - device->abs.min_x);
 237                 if (device->pending_event == EVDEV_NONE)
 238                         device->pending_event = EVDEV_ABSOLUTE_MOTION;
 239                 break;
 240         case ABS_Y:
 241                 device->abs.y =
 242                         (e->value - device->abs.min_y) * screen_height /
 243                         (device->abs.max_y - device->abs.min_y);
 244                 if (device->pending_event == EVDEV_NONE)
 245                         device->pending_event = EVDEV_ABSOLUTE_MOTION;
 246                 break;
 247         }
 248 }
 249
 250 static inline void
 251 evdev_process_relative(struct evdev_device *device,
 252                        struct input_event *e, uint32_t time)
 253 {
 254         switch (e->code) {
 255         case REL_X:
 256                 if (device->pending_event != EVDEV_RELATIVE_MOTION)
 257                         evdev_flush_pending_event(device, time);
 258                 device->rel.dx += wl_fixed_from_int(e->value);
 259                 device->pending_event = EVDEV_RELATIVE_MOTION;
 260                 break;
 261         case REL_Y:
 262                 if (device->pending_event != EVDEV_RELATIVE_MOTION)
 263                         evdev_flush_pending_event(device, time);
 264                 device->rel.dy += wl_fixed_from_int(e->value);
 265                 device->pending_event = EVDEV_RELATIVE_MOTION;
 266                 break;
 267         case REL_WHEEL:
 268                 evdev_flush_pending_event(device, time);
 269                 switch (e->value) {
 270                 case -1:
 271                         /* Scroll down */
 272                 case 1:
 273                         /* Scroll up */
 274                         notify_axis(device->seat,
 275                                     time,
 276                                     WL_POINTER_AXIS_VERTICAL_SCROLL,
 277                                     -1 * e->value * DEFAULT_AXIS_STEP_DISTANCE);
 278                         break;
 279                 default:
 280                         break;
 281                 }
 282                 break;
 283         case REL_HWHEEL:
 284                 evdev_flush_pending_event(device, time);
 285                 switch (e->value) {
 286                 case -1:
 287                         /* Scroll left */
 288                 case 1:
 289                         /* Scroll right */
 290                         notify_axis(device->seat,
 291                                     time,
 292                                     WL_POINTER_AXIS_HORIZONTAL_SCROLL,
 293                                     e->value * DEFAULT_AXIS_STEP_DISTANCE);
 294                         break;
 295                 default:
 296                         break;
 297
 298                 }
 299         }
 300 }
 301
 302 static inline void
 303 evdev_process_absolute(struct evdev_device *device,
 304                        struct input_event *e,
 305                        uint32_t time)
 306 {
 307         if (device->is_mt) {
 308                 evdev_process_touch(device, e, time);
 309         } else {
 310                 evdev_process_absolute_motion(device, e);
 311         }
 312 }
 313
 314 static void
 315 fallback_process(struct evdev_dispatch *dispatch,
 316                  struct evdev_device *device,
 317                  struct input_event *event,
 318                  uint32_t time)
 319 {
 320         switch (event->type) {
 321         case EV_REL:
 322                 evdev_process_relative(device, event, time);
 323                 break;
 324         case EV_ABS:
 325                 evdev_process_absolute(device, event, time);
 326                 break;
 327         case EV_KEY:
 328                 evdev_process_key(device, event, time);
 329                 break;
 330         case EV_SYN:
 331                 evdev_flush_pending_event(device, time);
 332                 break;
 333         }
 334 }
 335
 336 static void
 337 fallback_destroy(struct evdev_dispatch *dispatch)
 338 {
 339         free(dispatch);
 340 }
 341
 342 struct evdev_dispatch_interface fallback_interface = {
 343         fallback_process,
 344         fallback_destroy
 345 };
 346
 347 static struct evdev_dispatch *
 348 fallback_dispatch_create(void)
 349 {
 350         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 351         if (dispatch == NULL)
 352                 return NULL;
 353
 354         dispatch->interface = &fallback_interface;
 355
 356         return dispatch;
 357 }
 358
 359 static void
 360 evdev_process_events(struct evdev_device *device,
 361                      struct input_event *ev, int count)
 362 {
 363         struct evdev_dispatch *dispatch = device->dispatch;
 364         struct input_event *e, *end;
 365         uint32_t time = 0;
 366
 367         e = ev;
 368         end = e + count;
 369         for (e = ev; e < end; e++) {
 370                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 371
 372                 dispatch->interface->process(dispatch, device, e, time);
 373         }
 374 }
 375
 376 static int
 377 evdev_device_data(int fd, uint32_t mask, void *data)
 378 {
 379         struct weston_compositor *ec;
 380         struct evdev_device *device = data;
 381         struct input_event ev[32];
 382         int len;
 383
 384         ec = device->seat->compositor;
 385         if (!ec->focus)
 386                 return 1;
 387
 388         /* If the compositor is repainting, this function is called only once
 389          * per frame and we have to process all the events available on the
 390          * fd, otherwise there will be input lag. */
 391         do {
 392                 if (device->mtdev)
 393                         len = mtdev_get(device->mtdev, fd, ev,
 394                                         ARRAY_LENGTH(ev)) *
 395                                 sizeof (struct input_event);
 396                 else
 397                         len = read(fd, &ev, sizeof ev);
 398
 399                 if (len < 0 || len % sizeof ev[0] != 0) {
 400                         /* FIXME: call evdev_device_destroy when errno is ENODEV. */
 401                         return 1;
 402                 }
 403
 404                 evdev_process_events(device, ev, len / sizeof ev[0]);
 405
 406         } while (len > 0);
 407
 408         return 1;
 409 }
 410
 411 static int
 412 evdev_handle_device(struct evdev_device *device)
 413 {
 414         struct input_absinfo absinfo;
 415         unsigned long ev_bits[NBITS(EV_MAX)];
 416         unsigned long abs_bits[NBITS(ABS_MAX)];
 417         unsigned long rel_bits[NBITS(REL_MAX)];
 418         unsigned long key_bits[NBITS(KEY_MAX)];
 419         int has_key, has_abs;
 420         unsigned int i;
 421
 422         has_key = 0;
 423         has_abs = 0;
 424         device->caps = 0;
 425
 426         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 427         if (TEST_BIT(ev_bits, EV_ABS)) {
 428                 has_abs = 1;
 429
 430                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 431                       abs_bits);
 432
 433                 if (TEST_BIT(abs_bits, ABS_WHEEL) ||
 434                     TEST_BIT(abs_bits, ABS_GAS) ||
 435                     TEST_BIT(abs_bits, ABS_BRAKE) ||
 436                     TEST_BIT(abs_bits, ABS_HAT0X)) {
 437                         weston_log("device %s is a joystick, ignoring\n",
 438                                    device->devnode);
 439                         return 0;
 440                 }
 441
 442                 if (TEST_BIT(abs_bits, ABS_X)) {
 443                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 444                         device->abs.min_x = absinfo.minimum;
 445                         device->abs.max_x = absinfo.maximum;
 446                         device->caps |= EVDEV_MOTION_ABS;
 447                 }
 448                 if (TEST_BIT(abs_bits, ABS_Y)) {
 449                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 450                         device->abs.min_y = absinfo.minimum;
 451                         device->abs.max_y = absinfo.maximum;
 452                         device->caps |= EVDEV_MOTION_ABS;
 453                 }
 454                 /* We only handle the slotted Protocol B in weston.
 455                    Devices with ABS_MT_POSITION_* but not ABS_MT_SLOT
 456                    require mtdev for conversion. */
 457                 if (TEST_BIT(abs_bits, ABS_MT_POSITION_X) &&
 458                     TEST_BIT(abs_bits, ABS_MT_POSITION_Y)) {
 459                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_X),
 460                               &absinfo);
 461                         device->abs.min_x = absinfo.minimum;
 462                         device->abs.max_x = absinfo.maximum;
 463                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_Y),
 464                               &absinfo);
 465                         device->abs.min_y = absinfo.minimum;
 466                         device->abs.max_y = absinfo.maximum;
 467                         device->is_mt = 1;
 468                         device->caps |= EVDEV_TOUCH;
 469
 470                         if (!TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 471                                 device->mtdev = mtdev_new_open(device->fd);
 472                                 if (!device->mtdev) {
 473                                         weston_log("mtdev required but failed to open for %s\n",
 474                                                    device->devnode);
 475                                         return 0;
 476                                 }
 477                                 device->mt.slot = device->mtdev->caps.slot.value;
 478                         } else {
 479                                 ioctl(device->fd, EVIOCGABS(ABS_MT_SLOT),
 480                                       &absinfo);
 481                                 device->mt.slot = absinfo.value;
 482                         }
 483                 }
 484         }
 485         if (TEST_BIT(ev_bits, EV_REL)) {
 486                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 487                       rel_bits);
 488                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 489                         device->caps |= EVDEV_MOTION_REL;
 490         }
 491         if (TEST_BIT(ev_bits, EV_KEY)) {
 492                 has_key = 1;
 493                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 494                       key_bits);
 495                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 496                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 497                     has_abs) {
 498                         device->dispatch = evdev_touchpad_create(device);
 499                         weston_log("input device %s, %s is a touchpad\n",
 500                                    device->devname, device->devnode);
 501                 }
 502                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 503                         if (i >= BTN_MISC && i < KEY_OK)
 504                                 continue;
 505                         if (TEST_BIT(key_bits, i)) {
 506                                 device->caps |= EVDEV_KEYBOARD;
 507                                 break;
 508                         }
 509                 }
 510                 for (i = BTN_MISC; i < KEY_OK; i++) {
 511                         if (TEST_BIT(key_bits, i)) {
 512                                 device->caps |= EVDEV_BUTTON;
 513                                 break;
 514                         }
 515                 }
 516                 if (TEST_BIT(key_bits, BTN_TOUCH)) {
 517                         device->caps |= EVDEV_TOUCH;
 518                 }
 519
 520         }
 521         if (TEST_BIT(ev_bits, EV_LED)) {
 522                 device->caps |= EVDEV_KEYBOARD;
 523         }
 524
 525         /* This rule tries to catch accelerometer devices and opt out. We may
 526          * want to adjust the protocol later adding a proper event for dealing
 527          * with accelerometers and implement here accordingly */
 528         if (has_abs && !has_key && !device->is_mt) {
 529                 weston_log("input device %s, %s "
 530                            "ignored: unsupported device type\n",
 531                            device->devname, device->devnode);
 532                 return 0;
 533         }
 534
 535         return 1;
 536 }
 537
 538 static int
 539 evdev_configure_device(struct evdev_device *device)
 540 {
 541         if ((device->caps &
 542              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON))) {
 543                 weston_seat_init_pointer(device->seat);
 544                 weston_log("input device %s, %s is a pointer caps =%s%s%s\n",
 545                            device->devname, device->devnode,
 546                            device->caps & EVDEV_MOTION_ABS ? " absolute-motion" : "",
 547                            device->caps & EVDEV_MOTION_REL ? " relative-motion": "",
 548                            device->caps & EVDEV_BUTTON ? " button" : "");
 549         }
 550         if ((device->caps & EVDEV_KEYBOARD)) {
 551                 if (weston_seat_init_keyboard(device->seat, NULL) < 0)
 552                         return -1;
 553                 weston_log("input device %s, %s is a keyboard\n",
 554                            device->devname, device->devnode);
 555         }
 556         if ((device->caps & EVDEV_TOUCH)) {
 557                 weston_seat_init_touch(device->seat);
 558                 weston_log("input device %s, %s is a touch device\n",
 559                            device->devname, device->devnode);
 560         }
 561
 562         return 0;
 563 }
 564
 565 struct evdev_device *
 566 evdev_device_create(struct weston_seat *seat, const char *path, int device_fd)
 567 {
 568         struct evdev_device *device;
 569         struct weston_compositor *ec;
 570         char devname[256] = "unknown";
 571
 572         device = zalloc(sizeof *device);
 573         if (device == NULL)
 574                 return NULL;
 575
 576         ec = seat->compositor;
 577         device->output =
 578                 container_of(ec->output_list.next, struct weston_output, link);
 579
 580         device->seat = seat;
 581         device->is_mt = 0;
 582         device->mtdev = NULL;
 583         device->devnode = strdup(path);
 584         device->mt.slot = -1;
 585         device->rel.dx = 0;
 586         device->rel.dy = 0;
 587         device->dispatch = NULL;
 588         device->fd = device_fd;
 589         device->pending_event = EVDEV_NONE;
 590         wl_list_init(&device->link);
 591
 592         ioctl(device->fd, EVIOCGNAME(sizeof(devname)), devname);
 593         devname[sizeof(devname) - 1] = '\0';
 594         device->devname = strdup(devname);
 595
 596         if (!evdev_handle_device(device)) {
 597                 evdev_device_destroy(device);
 598                 return EVDEV_UNHANDLED_DEVICE;
 599         }
 600
 601         if (evdev_configure_device(device) == -1)
 602                 goto err;
 603
 604         /* If the dispatch was not set up use the fallback. */
 605         if (device->dispatch == NULL)
 606                 device->dispatch = fallback_dispatch_create();
 607         if (device->dispatch == NULL)
 608                 goto err;
 609
 610         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 611                                               WL_EVENT_READABLE,
 612                                               evdev_device_data, device);
 613         if (device->source == NULL)
 614                 goto err;
 615
 616         return device;
 617
 618 err:
 619         evdev_device_destroy(device);
 620         return NULL;
 621 }
 622
 623 void
 624 evdev_device_destroy(struct evdev_device *device)
 625 {
 626         struct evdev_dispatch *dispatch;
 627
 628         dispatch = device->dispatch;
 629         if (dispatch)
 630                 dispatch->interface->destroy(dispatch);
 631
 632         if (device->source)
 633                 wl_event_source_remove(device->source);
 634         wl_list_remove(&device->link);
 635         if (device->mtdev)
 636                 mtdev_close_delete(device->mtdev);
 637         close(device->fd);
 638         free(device->devname);
 639         free(device->devnode);
 640         free(device);
 641 }
 642
 643 void
 644 evdev_notify_keyboard_focus(struct weston_seat *seat,
 645                             struct wl_list *evdev_devices)
 646 {
 647         struct evdev_device *device;
 648         struct wl_array keys;
 649         unsigned int i, set;
 650         char evdev_keys[(KEY_CNT + 7) / 8];
 651         char all_keys[(KEY_CNT + 7) / 8];
 652         uint32_t *k;
 653         int ret;
 654
 655         if (!seat->keyboard)
 656                 return;
 657
 658         memset(all_keys, 0, sizeof all_keys);
 659         wl_list_for_each(device, evdev_devices, link) {
 660                 memset(evdev_keys, 0, sizeof evdev_keys);
 661                 ret = ioctl(device->fd,
 662                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 663                 if (ret < 0) {
 664                         weston_log("failed to get keys for device %s\n",
 665                                 device->devnode);
 666                         continue;
 667                 }
 668                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 669                         all_keys[i] |= evdev_keys[i];
 670         }
 671
 672         wl_array_init(&keys);
 673         for (i = 0; i < KEY_CNT; i++) {
 674                 set = all_keys[i >> 3] & (1 << (i & 7));
 675                 if (set) {
 676                         k = wl_array_add(&keys, sizeof *k);
 677                         *k = i;
 678                 }
 679         }
 680
 681         notify_keyboard_focus_in(seat, &keys, STATE_UPDATE_AUTOMATIC);
 682
 683         wl_array_release(&keys);
 684 }