src/libinput.c

   1 /*
   2  * Copyright © 2013 Jonas Ådahl
   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 <errno.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/epoll.h>
  30 #include <unistd.h>
  31 #include <assert.h>
  32
  33 #include "libinput.h"
  34 #include "libinput-private.h"
  35 #include "evdev.h"
  36 #include "udev-seat.h"
  37
  38 enum libinput_event_class {
  39         LIBINPUT_EVENT_CLASS_BASE,
  40         LIBINPUT_EVENT_CLASS_SEAT,
  41         LIBINPUT_EVENT_CLASS_DEVICE,
  42 };
  43
  44 struct libinput_source {
  45         libinput_source_dispatch_t dispatch;
  46         void *user_data;
  47         int fd;
  48         struct list link;
  49 };
  50
  51 struct libinput_event {
  52         enum libinput_event_type type;
  53         union libinput_event_target target;
  54 };
  55
  56 struct libinput_event_added_seat {
  57         struct libinput_event base;
  58         struct libinput_seat *seat;
  59 };
  60
  61 struct libinput_event_removed_seat {
  62         struct libinput_event base;
  63         struct libinput_seat *seat;
  64 };
  65
  66 struct libinput_event_added_device {
  67         struct libinput_event base;
  68         struct libinput_device *device;
  69 };
  70
  71 struct libinput_event_removed_device {
  72         struct libinput_event base;
  73         struct libinput_device *device;
  74 };
  75
  76 struct libinput_event_device_register_capability {
  77         struct libinput_event base;
  78         enum libinput_device_capability capability;
  79 };
  80
  81 struct libinput_event_device_unregister_capability {
  82         struct libinput_event base;
  83         enum libinput_device_capability capability;
  84 };
  85
  86 struct libinput_event_keyboard_key {
  87         struct libinput_event base;
  88         uint32_t time;
  89         uint32_t key;
  90         enum libinput_keyboard_key_state state;
  91 };
  92
  93 struct libinput_event_pointer_motion {
  94         struct libinput_event base;
  95         uint32_t time;
  96         li_fixed_t dx;
  97         li_fixed_t dy;
  98 };
  99
 100 struct libinput_event_pointer_motion_absolute {
 101         struct libinput_event base;
 102         uint32_t time;
 103         li_fixed_t x;
 104         li_fixed_t y;
 105 };
 106
 107 struct libinput_event_pointer_button {
 108         struct libinput_event base;
 109         uint32_t time;
 110         uint32_t button;
 111         enum libinput_pointer_button_state state;
 112 };
 113
 114 struct libinput_event_pointer_axis {
 115         struct libinput_event base;
 116         uint32_t time;
 117         enum libinput_pointer_axis axis;
 118         li_fixed_t value;
 119 };
 120
 121 struct libinput_event_touch_touch {
 122         struct libinput_event base;
 123         uint32_t time;
 124         uint32_t slot;
 125         li_fixed_t x;
 126         li_fixed_t y;
 127         enum libinput_touch_type touch_type;
 128 };
 129
 130 static void
 131 libinput_post_event(struct libinput *libinput,
 132                     struct libinput_event *event);
 133
 134 LIBINPUT_EXPORT enum libinput_event_type
 135 libinput_event_get_type(struct libinput_event *event)
 136 {
 137         return event->type;
 138 }
 139
 140 LIBINPUT_EXPORT union libinput_event_target
 141 libinput_event_get_target(struct libinput_event *event)
 142 {
 143         return event->target;
 144 }
 145
 146 LIBINPUT_EXPORT struct libinput_seat *
 147 libinput_event_added_seat_get_seat(struct libinput_event_added_seat *event)
 148 {
 149         return event->seat;
 150 }
 151
 152 LIBINPUT_EXPORT struct libinput_seat *
 153 libinput_event_removed_seat_get_seat(struct libinput_event_removed_seat *event)
 154 {
 155         return event->seat;
 156 }
 157
 158 LIBINPUT_EXPORT struct libinput_device *
 159 libinput_event_added_device_get_device(
 160         struct libinput_event_added_device *event)
 161 {
 162         return event->device;
 163 }
 164
 165 LIBINPUT_EXPORT struct libinput_device *
 166 libinput_event_removed_device_get_device(
 167         struct libinput_event_removed_device *event)
 168 {
 169         return event->device;
 170 }
 171
 172 LIBINPUT_EXPORT enum libinput_device_capability
 173 libinput_event_device_register_capability_get_capability(
 174         struct libinput_event_device_register_capability *event)
 175 {
 176         return event->capability;
 177 }
 178
 179 LIBINPUT_EXPORT enum libinput_device_capability
 180 libinput_event_device_unregister_capability_get_capability(
 181         struct libinput_event_device_unregister_capability *event)
 182 {
 183         return event->capability;
 184 }
 185
 186 LIBINPUT_EXPORT uint32_t
 187 libinput_event_keyboard_key_get_time(
 188         struct libinput_event_keyboard_key *event)
 189 {
 190         return event->time;
 191 }
 192
 193 LIBINPUT_EXPORT uint32_t
 194 libinput_event_keyboard_key_get_key(
 195         struct libinput_event_keyboard_key *event)
 196 {
 197         return event->key;
 198 }
 199
 200 LIBINPUT_EXPORT enum libinput_keyboard_key_state
 201 libinput_event_keyboard_key_get_state(
 202         struct libinput_event_keyboard_key *event)
 203 {
 204         return event->state;
 205 }
 206
 207 LIBINPUT_EXPORT uint32_t
 208 libinput_event_pointer_motion_get_time(
 209         struct libinput_event_pointer_motion *event)
 210 {
 211         return event->time;
 212 }
 213
 214 LIBINPUT_EXPORT li_fixed_t
 215 libinput_event_pointer_motion_get_dx(
 216         struct libinput_event_pointer_motion *event)
 217 {
 218         return event->dx;
 219 }
 220
 221 LIBINPUT_EXPORT li_fixed_t
 222 libinput_event_pointer_motion_get_dy(
 223         struct libinput_event_pointer_motion *event)
 224 {
 225         return event->dy;
 226 }
 227
 228 LIBINPUT_EXPORT uint32_t
 229 libinput_event_pointer_motion_absolute_get_time(
 230         struct libinput_event_pointer_motion_absolute *event)
 231 {
 232         return event->time;
 233 }
 234
 235 LIBINPUT_EXPORT li_fixed_t
 236 libinput_event_pointer_motion_absolute_get_x(
 237         struct libinput_event_pointer_motion_absolute *event)
 238 {
 239         return event->x;
 240 }
 241
 242 LIBINPUT_EXPORT li_fixed_t
 243 libinput_event_pointer_motion_absolute_get_y(
 244         struct libinput_event_pointer_motion_absolute *event)
 245 {
 246         return event->y;
 247 }
 248
 249 LIBINPUT_EXPORT uint32_t
 250 libinput_event_pointer_button_get_time(
 251         struct libinput_event_pointer_button *event)
 252 {
 253         return event->time;
 254 }
 255
 256 LIBINPUT_EXPORT uint32_t
 257 libinput_event_pointer_button_get_button(
 258         struct libinput_event_pointer_button *event)
 259 {
 260         return event->button;
 261 }
 262
 263 LIBINPUT_EXPORT enum libinput_pointer_button_state
 264 libinput_event_pointer_button_get_state(
 265         struct libinput_event_pointer_button *event)
 266 {
 267         return event->state;
 268 }
 269
 270 LIBINPUT_EXPORT uint32_t
 271 libinput_event_pointer_axis_get_time(
 272         struct libinput_event_pointer_axis *event)
 273 {
 274         return event->time;
 275 }
 276
 277 LIBINPUT_EXPORT enum libinput_pointer_axis
 278 libinput_event_pointer_axis_get_axis(
 279         struct libinput_event_pointer_axis *event)
 280 {
 281         return event->axis;
 282 }
 283
 284 LIBINPUT_EXPORT li_fixed_t
 285 libinput_event_pointer_axis_get_value(
 286         struct libinput_event_pointer_axis *event)
 287 {
 288         return event->value;
 289 }
 290
 291 LIBINPUT_EXPORT uint32_t
 292 libinput_event_touch_touch_get_time(
 293         struct libinput_event_touch_touch *event)
 294 {
 295         return event->time;
 296 }
 297
 298 LIBINPUT_EXPORT uint32_t
 299 libinput_event_touch_touch_get_slot(
 300         struct libinput_event_touch_touch *event)
 301 {
 302         return event->slot;
 303 }
 304
 305 LIBINPUT_EXPORT li_fixed_t
 306 libinput_event_touch_touch_get_x(
 307         struct libinput_event_touch_touch *event)
 308 {
 309         return event->x;
 310 }
 311
 312 LIBINPUT_EXPORT li_fixed_t
 313 libinput_event_touch_touch_get_y(
 314         struct libinput_event_touch_touch *event)
 315 {
 316         return event->y;
 317 }
 318
 319 LIBINPUT_EXPORT enum libinput_touch_type
 320 libinput_event_touch_touch_get_touch_type(
 321         struct libinput_event_touch_touch *event)
 322 {
 323         return event->touch_type;
 324 }
 325
 326 struct libinput_source *
 327 libinput_add_fd(struct libinput *libinput,
 328                 int fd,
 329                 libinput_source_dispatch_t dispatch,
 330                 void *user_data)
 331 {
 332         struct libinput_source *source;
 333         struct epoll_event ep;
 334
 335         source = malloc(sizeof *source);
 336         if (!source)
 337                 return NULL;
 338
 339         source->dispatch = dispatch;
 340         source->user_data = user_data;
 341         source->fd = fd;
 342
 343         memset(&ep, 0, sizeof ep);
 344         ep.events = EPOLLIN;
 345         ep.data.ptr = source;
 346
 347         if (epoll_ctl(libinput->epoll_fd, EPOLL_CTL_ADD, fd, &ep) < 0) {
 348                 close(source->fd);
 349                 free(source);
 350                 return NULL;
 351         }
 352
 353         return source;
 354 }
 355
 356 void
 357 libinput_remove_source(struct libinput *libinput,
 358                        struct libinput_source *source)
 359 {
 360         epoll_ctl(libinput->epoll_fd, EPOLL_CTL_DEL, source->fd, NULL);
 361         close(source->fd);
 362         source->fd = -1;
 363         list_insert(&libinput->source_destroy_list, &source->link);
 364 }
 365
 366 int
 367 libinput_init(struct libinput *libinput,
 368               const struct libinput_interface *interface,
 369               void *user_data)
 370 {
 371         libinput->epoll_fd = epoll_create1(EPOLL_CLOEXEC);;
 372         if (libinput->epoll_fd < 0)
 373                 return -1;
 374
 375         libinput->events_len = 4;
 376         libinput->events = zalloc(libinput->events_len * sizeof(*libinput->events));
 377         if (!libinput->events) {
 378                 close(libinput->epoll_fd);
 379                 return -1;
 380         }
 381
 382         libinput->interface = interface;
 383         libinput->user_data = user_data;
 384         list_init(&libinput->source_destroy_list);
 385         list_init(&libinput->seat_list);
 386
 387         return 0;
 388 }
 389
 390 static void
 391 libinput_device_destroy(struct libinput_device *device);
 392
 393 static void
 394 libinput_seat_destroy(struct libinput_seat *seat);
 395
 396 LIBINPUT_EXPORT void
 397 libinput_destroy(struct libinput *libinput)
 398 {
 399         struct libinput_event *event;
 400         struct libinput_device *device, *next_device;
 401         struct libinput_seat *seat, *next_seat;
 402
 403         while ((event = libinput_get_event(libinput)))
 404                libinput_event_destroy(event);
 405         free(libinput->events);
 406
 407         list_for_each_safe(seat, next_seat, &libinput->seat_list, link) {
 408                 list_for_each_safe(device, next_device,
 409                                    &seat->devices_list,
 410                                    link)
 411                         libinput_device_destroy(device);
 412
 413                 libinput_seat_destroy(seat);
 414         }
 415
 416         close(libinput->epoll_fd);
 417         free(libinput);
 418 }
 419
 420 static enum libinput_event_class
 421 libinput_event_get_class(struct libinput_event *event)
 422 {
 423         switch (event->type) {
 424         case LIBINPUT_EVENT_ADDED_SEAT:
 425         case LIBINPUT_EVENT_REMOVED_SEAT:
 426         case LIBINPUT_EVENT_ADDED_DEVICE:
 427         case LIBINPUT_EVENT_REMOVED_DEVICE:
 428                 return LIBINPUT_EVENT_CLASS_BASE;
 429
 430         case LIBINPUT_EVENT_DEVICE_REGISTER_CAPABILITY:
 431         case LIBINPUT_EVENT_DEVICE_UNREGISTER_CAPABILITY:
 432         case LIBINPUT_EVENT_KEYBOARD_KEY:
 433         case LIBINPUT_EVENT_POINTER_MOTION:
 434         case LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE:
 435         case LIBINPUT_EVENT_POINTER_BUTTON:
 436         case LIBINPUT_EVENT_POINTER_AXIS:
 437         case LIBINPUT_EVENT_TOUCH_TOUCH:
 438                 return LIBINPUT_EVENT_CLASS_DEVICE;
 439         }
 440
 441         /* We should never end up here. */
 442         abort();
 443 }
 444
 445 LIBINPUT_EXPORT void
 446 libinput_event_destroy(struct libinput_event *event)
 447 {
 448         if (event == NULL)
 449                 return;
 450
 451         switch (libinput_event_get_class(event)) {
 452         case LIBINPUT_EVENT_CLASS_BASE:
 453                 break;
 454         case LIBINPUT_EVENT_CLASS_SEAT:
 455                 libinput_seat_unref(event->target.seat);
 456                 break;
 457         case LIBINPUT_EVENT_CLASS_DEVICE:
 458                 libinput_device_unref(event->target.device);
 459                 break;
 460         }
 461
 462         free(event);
 463 }
 464
 465 int
 466 open_restricted(struct libinput *libinput,
 467                 const char *path, int flags)
 468 {
 469         return libinput->interface->open_restricted(path,
 470                                                     flags,
 471                                                     libinput->user_data);
 472 }
 473
 474 void
 475 close_restricted(struct libinput *libinput, int fd)
 476 {
 477         return libinput->interface->close_restricted(fd, libinput->user_data);
 478 }
 479
 480 void
 481 libinput_seat_init(struct libinput_seat *seat,
 482                    struct libinput *libinput,
 483                    const char *name)
 484 {
 485         seat->refcount = 1;
 486         seat->libinput = libinput;
 487         seat->name = strdup(name);
 488         list_init(&seat->devices_list);
 489 }
 490
 491 LIBINPUT_EXPORT void
 492 libinput_seat_ref(struct libinput_seat *seat)
 493 {
 494         seat->refcount++;
 495 }
 496
 497 static void
 498 libinput_seat_destroy(struct libinput_seat *seat)
 499 {
 500         free(seat->name);
 501         udev_seat_destroy((struct udev_seat *) seat);
 502 }
 503
 504 LIBINPUT_EXPORT void
 505 libinput_seat_unref(struct libinput_seat *seat)
 506 {
 507         seat->refcount--;
 508         if (seat->refcount == 0)
 509                 libinput_seat_destroy(seat);
 510 }
 511
 512 LIBINPUT_EXPORT void
 513 libinput_seat_set_user_data(struct libinput_seat *seat, void *user_data)
 514 {
 515         seat->user_data = user_data;
 516 }
 517
 518 LIBINPUT_EXPORT void *
 519 libinput_seat_get_user_data(struct libinput_seat *seat)
 520 {
 521         return seat->user_data;
 522 }
 523
 524 LIBINPUT_EXPORT const char *
 525 libinput_seat_get_name(struct libinput_seat *seat)
 526 {
 527         return seat->name;
 528 }
 529
 530 void
 531 libinput_device_init(struct libinput_device *device,
 532                      struct libinput_seat *seat)
 533 {
 534         device->seat = seat;
 535         device->refcount = 1;
 536 }
 537
 538 LIBINPUT_EXPORT void
 539 libinput_device_ref(struct libinput_device *device)
 540 {
 541         device->refcount++;
 542 }
 543
 544 static void
 545 libinput_device_destroy(struct libinput_device *device)
 546 {
 547         evdev_device_destroy((struct evdev_device *) device);
 548 }
 549
 550 LIBINPUT_EXPORT void
 551 libinput_device_unref(struct libinput_device *device)
 552 {
 553         device->refcount--;
 554         if (device->refcount == 0)
 555                 libinput_device_destroy(device);
 556 }
 557
 558 LIBINPUT_EXPORT int
 559 libinput_get_fd(struct libinput *libinput)
 560 {
 561         return libinput->epoll_fd;
 562 }
 563
 564 LIBINPUT_EXPORT int
 565 libinput_dispatch(struct libinput *libinput)
 566 {
 567         struct libinput_source *source, *next;
 568         struct epoll_event ep[32];
 569         int i, count;
 570
 571         count = epoll_wait(libinput->epoll_fd, ep, ARRAY_LENGTH(ep), 0);
 572         if (count < 0)
 573                 return -errno;
 574
 575         for (i = 0; i < count; ++i) {
 576                 source = ep[i].data.ptr;
 577                 if (source->fd == -1)
 578                         continue;
 579
 580                 source->dispatch(source->user_data);
 581         }
 582
 583         list_for_each_safe(source, next, &libinput->source_destroy_list, link)
 584                 free(source);
 585         list_init(&libinput->source_destroy_list);
 586
 587         return 0;
 588 }
 589
 590 static void
 591 init_event_base(struct libinput_event *event,
 592                 enum libinput_event_type type,
 593                 union libinput_event_target target)
 594 {
 595         event->type = type;
 596         event->target = target;
 597 }
 598
 599 static void
 600 post_base_event(struct libinput *libinput,
 601                 enum libinput_event_type type,
 602                 struct libinput_event *event)
 603 {
 604         init_event_base(event, type,
 605                         (union libinput_event_target) { .libinput = libinput });
 606         libinput_post_event(libinput, event);
 607 }
 608
 609 static void
 610 post_device_event(struct libinput_device *device,
 611                   enum libinput_event_type type,
 612                   struct libinput_event *event)
 613 {
 614         init_event_base(event, type,
 615                         (union libinput_event_target) { .device = device });
 616         libinput_post_event(device->seat->libinput, event);
 617 }
 618
 619 void
 620 notify_added_seat(struct libinput_seat *seat)
 621 {
 622         struct libinput_event_added_seat *added_seat_event;
 623
 624         added_seat_event = malloc(sizeof *added_seat_event);
 625         if (!added_seat_event)
 626                 return;
 627
 628         *added_seat_event = (struct libinput_event_added_seat) {
 629                 .seat = seat,
 630         };
 631
 632         post_base_event(seat->libinput,
 633                         LIBINPUT_EVENT_ADDED_SEAT,
 634                         &added_seat_event->base);
 635 }
 636
 637 void
 638 notify_removed_seat(struct libinput_seat *seat)
 639 {
 640         struct libinput_event_removed_seat *removed_seat_event;
 641
 642         removed_seat_event = malloc(sizeof *removed_seat_event);
 643         if (!removed_seat_event)
 644                 return;
 645
 646         *removed_seat_event = (struct libinput_event_removed_seat) {
 647                 .seat = seat,
 648         };
 649
 650         post_base_event(seat->libinput,
 651                         LIBINPUT_EVENT_REMOVED_SEAT,
 652                         &removed_seat_event->base);
 653 }
 654
 655 void
 656 notify_added_device(struct libinput_device *device)
 657 {
 658         struct libinput_event_added_device *added_device_event;
 659
 660         added_device_event = malloc(sizeof *added_device_event);
 661         if (!added_device_event)
 662                 return;
 663
 664         *added_device_event = (struct libinput_event_added_device) {
 665                 .device = device,
 666         };
 667
 668         post_base_event(device->seat->libinput,
 669                         LIBINPUT_EVENT_ADDED_DEVICE,
 670                         &added_device_event->base);
 671 }
 672
 673 void
 674 notify_removed_device(struct libinput_device *device)
 675 {
 676         struct libinput_event_removed_device *removed_device_event;
 677
 678         removed_device_event = malloc(sizeof *removed_device_event);
 679         if (!removed_device_event)
 680                 return;
 681
 682         *removed_device_event = (struct libinput_event_removed_device) {
 683                 .device = device,
 684         };
 685
 686         post_base_event(device->seat->libinput,
 687                         LIBINPUT_EVENT_REMOVED_DEVICE,
 688                         &removed_device_event->base);
 689 }
 690
 691 void
 692 device_register_capability(struct libinput_device *device,
 693                            enum libinput_device_capability capability)
 694 {
 695         struct libinput_event_device_register_capability *capability_event;
 696
 697         capability_event = malloc(sizeof *capability_event);
 698
 699         *capability_event = (struct libinput_event_device_register_capability) {
 700                 .capability = capability,
 701         };
 702
 703         post_device_event(device,
 704                           LIBINPUT_EVENT_DEVICE_REGISTER_CAPABILITY,
 705                           &capability_event->base);
 706 }
 707
 708 void
 709 device_unregister_capability(struct libinput_device *device,
 710                              enum libinput_device_capability capability)
 711 {
 712         struct libinput_event_device_unregister_capability *capability_event;
 713
 714         capability_event = malloc(sizeof *capability_event);
 715
 716         *capability_event = (struct libinput_event_device_unregister_capability) {
 717                 .capability = capability,
 718         };
 719
 720         post_device_event(device,
 721                           LIBINPUT_EVENT_DEVICE_UNREGISTER_CAPABILITY,
 722                           &capability_event->base);
 723 }
 724
 725 void
 726 keyboard_notify_key(struct libinput_device *device,
 727                     uint32_t time,
 728                     uint32_t key,
 729                     enum libinput_keyboard_key_state state)
 730 {
 731         struct libinput_event_keyboard_key *key_event;
 732
 733         key_event = malloc(sizeof *key_event);
 734         if (!key_event)
 735                 return;
 736
 737         *key_event = (struct libinput_event_keyboard_key) {
 738                 .time = time,
 739                 .key = key,
 740                 .state = state,
 741         };
 742
 743         post_device_event(device,
 744                           LIBINPUT_EVENT_KEYBOARD_KEY,
 745                           &key_event->base);
 746 }
 747
 748 void
 749 pointer_notify_motion(struct libinput_device *device,
 750                       uint32_t time,
 751                       li_fixed_t dx,
 752                       li_fixed_t dy)
 753 {
 754         struct libinput_event_pointer_motion *motion_event;
 755
 756         motion_event = malloc(sizeof *motion_event);
 757         if (!motion_event)
 758                 return;
 759
 760         *motion_event = (struct libinput_event_pointer_motion) {
 761                 .time = time,
 762                 .dx = dx,
 763                 .dy = dy,
 764         };
 765
 766         post_device_event(device,
 767                           LIBINPUT_EVENT_POINTER_MOTION,
 768                           &motion_event->base);
 769 }
 770
 771 void
 772 pointer_notify_motion_absolute(struct libinput_device *device,
 773                                uint32_t time,
 774                                li_fixed_t x,
 775                                li_fixed_t y)
 776 {
 777         struct libinput_event_pointer_motion_absolute *motion_absolute_event;
 778
 779         motion_absolute_event = malloc(sizeof *motion_absolute_event);
 780         if (!motion_absolute_event)
 781                 return;
 782
 783         *motion_absolute_event = (struct libinput_event_pointer_motion_absolute) {
 784                 .time = time,
 785                 .x = x,
 786                 .y = y,
 787         };
 788
 789         post_device_event(device,
 790                           LIBINPUT_EVENT_POINTER_MOTION_ABSOLUTE,
 791                           &motion_absolute_event->base);
 792 }
 793
 794 void
 795 pointer_notify_button(struct libinput_device *device,
 796                       uint32_t time,
 797                       int32_t button,
 798                       enum libinput_pointer_button_state state)
 799 {
 800         struct libinput_event_pointer_button *button_event;
 801
 802         button_event = malloc(sizeof *button_event);
 803         if (!button_event)
 804                 return;
 805
 806         *button_event = (struct libinput_event_pointer_button) {
 807                 .time = time,
 808                 .button = button,
 809                 .state = state,
 810         };
 811
 812         post_device_event(device,
 813                           LIBINPUT_EVENT_POINTER_BUTTON,
 814                           &button_event->base);
 815 }
 816
 817 void
 818 pointer_notify_axis(struct libinput_device *device,
 819                     uint32_t time,
 820                     enum libinput_pointer_axis axis,
 821                     li_fixed_t value)
 822 {
 823         struct libinput_event_pointer_axis *axis_event;
 824
 825         axis_event = malloc(sizeof *axis_event);
 826         if (!axis_event)
 827                 return;
 828
 829         *axis_event = (struct libinput_event_pointer_axis) {
 830                 .time = time,
 831                 .axis = axis,
 832                 .value = value,
 833         };
 834
 835         post_device_event(device,
 836                           LIBINPUT_EVENT_POINTER_AXIS,
 837                           &axis_event->base);
 838 }
 839
 840 void
 841 touch_notify_touch(struct libinput_device *device,
 842                    uint32_t time,
 843                    int32_t slot,
 844                    li_fixed_t x,
 845                    li_fixed_t y,
 846                    enum libinput_touch_type touch_type)
 847 {
 848         struct libinput_event_touch_touch *touch_event;
 849
 850         touch_event = malloc(sizeof *touch_event);
 851         if (!touch_event)
 852                 return;
 853
 854         *touch_event = (struct libinput_event_touch_touch) {
 855                 .time = time,
 856                 .slot = slot,
 857                 .x = x,
 858                 .y = y,
 859                 .touch_type = touch_type,
 860         };
 861
 862         post_device_event(device,
 863                           LIBINPUT_EVENT_TOUCH_TOUCH,
 864                           &touch_event->base);
 865 }
 866
 867 static void
 868 libinput_post_event(struct libinput *libinput,
 869                     struct libinput_event *event)
 870 {
 871         struct libinput_event **events = libinput->events;
 872         size_t events_len = libinput->events_len;
 873         size_t events_count = libinput->events_count;
 874         size_t move_len;
 875         size_t new_out;
 876
 877         events_count++;
 878         if (events_count > events_len) {
 879                 events_len *= 2;
 880                 events = realloc(events, events_len * sizeof *events);
 881                 if (!events) {
 882                         fprintf(stderr, "Failed to reallocate event ring "
 883                                 "buffer");
 884                         return;
 885                 }
 886
 887                 if (libinput->events_count > 0 && libinput->events_in == 0) {
 888                         libinput->events_in = libinput->events_len;
 889                 } else if (libinput->events_count > 0 &&
 890                            libinput->events_out >= libinput->events_in) {
 891                         move_len = libinput->events_len - libinput->events_out;
 892                         new_out = events_len - move_len;
 893                         memmove(events + new_out,
 894                                 events + libinput->events_out,
 895                                 move_len * sizeof *events);
 896                         libinput->events_out = new_out;
 897                 }
 898
 899                 libinput->events = events;
 900                 libinput->events_len = events_len;
 901         }
 902
 903         switch (libinput_event_get_class(event)) {
 904         case LIBINPUT_EVENT_CLASS_BASE:
 905                 break;
 906         case LIBINPUT_EVENT_CLASS_SEAT:
 907                 libinput_seat_ref(event->target.seat);
 908                 break;
 909         case LIBINPUT_EVENT_CLASS_DEVICE:
 910                 libinput_device_ref(event->target.device);
 911                 break;
 912         }
 913
 914         libinput->events_count = events_count;
 915         events[libinput->events_in] = event;
 916         libinput->events_in = (libinput->events_in + 1) % libinput->events_len;
 917 }
 918
 919 LIBINPUT_EXPORT struct libinput_event *
 920 libinput_get_event(struct libinput *libinput)
 921 {
 922         struct libinput_event *event;
 923
 924         if (libinput->events_count == 0)
 925                 return NULL;
 926
 927         event = libinput->events[libinput->events_out];
 928         libinput->events_out =
 929                 (libinput->events_out + 1) % libinput->events_len;
 930         libinput->events_count--;
 931
 932         return event;
 933 }
 934
 935 LIBINPUT_EXPORT void *
 936 libinput_get_user_data(struct libinput *libinput)
 937 {
 938         return libinput->user_data;
 939 }
 940
 941 LIBINPUT_EXPORT int
 942 libinput_resume(struct libinput *libinput)
 943 {
 944         return udev_input_enable((struct udev_input *) libinput);
 945 }
 946
 947 LIBINPUT_EXPORT void
 948 libinput_suspend(struct libinput *libinput)
 949 {
 950         udev_input_disable((struct udev_input *) libinput);
 951 }
 952
 953 LIBINPUT_EXPORT void
 954 libinput_device_set_user_data(struct libinput_device *device, void *user_data)
 955 {
 956         device->user_data = user_data;
 957 }
 958
 959 LIBINPUT_EXPORT void *
 960 libinput_device_get_user_data(struct libinput_device *device)
 961 {
 962         return device->user_data;
 963 }
 964
 965 LIBINPUT_EXPORT const char *
 966 libinput_device_get_sysname(struct libinput_device *device)
 967 {
 968         return evdev_device_get_sysname((struct evdev_device *) device);
 969 }
 970
 971 LIBINPUT_EXPORT const char *
 972 libinput_device_get_output_name(struct libinput_device *device)
 973 {
 974         return evdev_device_get_output((struct evdev_device *) device);
 975 }
 976
 977 LIBINPUT_EXPORT struct libinput_seat *
 978 libinput_device_get_seat(struct libinput_device *device)
 979 {
 980         return device->seat;
 981 }
 982
 983 LIBINPUT_EXPORT void
 984 libinput_device_led_update(struct libinput_device *device,
 985                            enum libinput_led leds)
 986 {
 987         evdev_device_led_update((struct evdev_device *) device, leds);
 988 }
 989
 990 LIBINPUT_EXPORT int
 991 libinput_device_get_keys(struct libinput_device *device,
 992                          char *keys, size_t size)
 993 {
 994         return evdev_device_get_keys((struct evdev_device *) device,
 995                                      keys,
 996                                      size);
 997 }
 998
 999 LIBINPUT_EXPORT void
1000 libinput_device_calibrate(struct libinput_device *device,
1001                           float calibration[6])
1002 {
1003         evdev_device_calibrate((struct evdev_device *) device, calibration);
1004 }
1005
1006 LIBINPUT_EXPORT int
1007 libinput_device_has_capability(struct libinput_device *device,
1008                                enum libinput_device_capability capability)
1009 {
1010         return evdev_device_has_capability((struct evdev_device *) device,
1011                                            capability);
1012 }