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 <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <linux/input.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29 #include <mtdev.h>
  30
  31 #include "compositor.h"
  32 #include "evdev.h"
  33 #include "evdev-private.h"
  34 #include "launcher-util.h"
  35
  36 static void
  37 evdev_led_update(struct weston_seat *seat_base, enum weston_led leds)
  38 {
  39         static const struct {
  40                 enum weston_led weston;
  41                 int evdev;
  42         } map[] = {
  43                 { LED_NUM_LOCK, LED_NUML },
  44                 { LED_CAPS_LOCK, LED_CAPSL },
  45                 { LED_SCROLL_LOCK, LED_SCROLLL },
  46         };
  47         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
  48         struct evdev_input_device *device;
  49         struct input_event ev[ARRAY_LENGTH(map)];
  50         unsigned int i;
  51
  52         memset(ev, 0, sizeof(ev));
  53         for (i = 0; i < ARRAY_LENGTH(map); i++) {
  54                 ev[i].type = EV_LED;
  55                 ev[i].code = map[i].evdev;
  56                 ev[i].value = !!(leds & map[i].weston);
  57         }
  58
  59         wl_list_for_each(device, &seat->devices_list, link) {
  60                 if (device->caps & EVDEV_KEYBOARD)
  61                         write(device->fd, ev, sizeof *ev);
  62         }
  63 }
  64
  65 static inline void
  66 evdev_process_key(struct evdev_input_device *device,
  67                         struct input_event *e, int time)
  68 {
  69         if (e->value == 2)
  70                 return;
  71
  72         switch (e->code) {
  73         case BTN_LEFT:
  74         case BTN_RIGHT:
  75         case BTN_MIDDLE:
  76         case BTN_SIDE:
  77         case BTN_EXTRA:
  78         case BTN_FORWARD:
  79         case BTN_BACK:
  80         case BTN_TASK:
  81                 notify_button(&device->master->base.seat,
  82                               time, e->code,
  83                               e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
  84                                          WL_POINTER_BUTTON_STATE_RELEASED);
  85                 break;
  86
  87         default:
  88                 notify_key(&device->master->base.seat,
  89                            time, e->code, e->value);
  90                 break;
  91         }
  92 }
  93
  94 static void
  95 evdev_process_touch(struct evdev_input_device *device,
  96                     struct input_event *e)
  97 {
  98         const int screen_width = device->output->current->width;
  99         const int screen_height = device->output->current->height;
 100
 101         switch (e->code) {
 102         case ABS_MT_SLOT:
 103                 device->mt.slot = e->value;
 104                 break;
 105         case ABS_MT_TRACKING_ID:
 106                 if (e->value >= 0)
 107                         device->pending_events |= EVDEV_ABSOLUTE_MT_DOWN;
 108                 else
 109                         device->pending_events |= EVDEV_ABSOLUTE_MT_UP;
 110                 break;
 111         case ABS_MT_POSITION_X:
 112                 device->mt.x[device->mt.slot] =
 113                         (e->value - device->abs.min_x) * screen_width /
 114                         (device->abs.max_x - device->abs.min_x) +
 115                         device->output->x;
 116                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 117                 break;
 118         case ABS_MT_POSITION_Y:
 119                 device->mt.y[device->mt.slot] =
 120                         (e->value - device->abs.min_y) * screen_height /
 121                         (device->abs.max_y - device->abs.min_y) +
 122                         device->output->y;
 123                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 124                 break;
 125         }
 126 }
 127
 128 static inline void
 129 evdev_process_absolute_motion(struct evdev_input_device *device,
 130                               struct input_event *e)
 131 {
 132         const int screen_width = device->output->current->width;
 133         const int screen_height = device->output->current->height;
 134
 135         switch (e->code) {
 136         case ABS_X:
 137                 device->abs.x =
 138                         (e->value - device->abs.min_x) * screen_width /
 139                         (device->abs.max_x - device->abs.min_x) +
 140                         device->output->x;
 141                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 142                 break;
 143         case ABS_Y:
 144                 device->abs.y =
 145                         (e->value - device->abs.min_y) * screen_height /
 146                         (device->abs.max_y - device->abs.min_y) +
 147                         device->output->y;
 148                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 149                 break;
 150         }
 151 }
 152
 153 static inline void
 154 evdev_process_relative(struct evdev_input_device *device,
 155                        struct input_event *e, uint32_t time)
 156 {
 157         switch (e->code) {
 158         case REL_X:
 159                 device->rel.dx += wl_fixed_from_int(e->value);
 160                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 161                 break;
 162         case REL_Y:
 163                 device->rel.dy += wl_fixed_from_int(e->value);
 164                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 165                 break;
 166         case REL_WHEEL:
 167                 notify_axis(&device->master->base.seat,
 168                               time,
 169                               WL_POINTER_AXIS_VERTICAL_SCROLL, e->value);
 170                 break;
 171         case REL_HWHEEL:
 172                 notify_axis(&device->master->base.seat,
 173                               time,
 174                               WL_POINTER_AXIS_HORIZONTAL_SCROLL, e->value);
 175                 break;
 176         }
 177 }
 178
 179 static inline void
 180 evdev_process_absolute(struct evdev_input_device *device,
 181                        struct input_event *e)
 182 {
 183         if (device->is_mt) {
 184                 evdev_process_touch(device, e);
 185         } else {
 186                 evdev_process_absolute_motion(device, e);
 187         }
 188 }
 189
 190 static int
 191 is_motion_event(struct input_event *e)
 192 {
 193         switch (e->type) {
 194         case EV_REL:
 195                 switch (e->code) {
 196                 case REL_X:
 197                 case REL_Y:
 198                         return 1;
 199                 }
 200         case EV_ABS:
 201                 switch (e->code) {
 202                 case ABS_X:
 203                 case ABS_Y:
 204                 case ABS_MT_POSITION_X:
 205                 case ABS_MT_POSITION_Y:
 206                         return 1;
 207                 }
 208         }
 209
 210         return 0;
 211 }
 212
 213 static void
 214 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 215 {
 216         struct weston_seat *master = &device->master->base;
 217
 218         if (!device->pending_events)
 219                 return;
 220
 221         if (device->pending_events & EVDEV_RELATIVE_MOTION) {
 222                 notify_motion(&master->seat, time,
 223                               master->seat.pointer->x + device->rel.dx,
 224                               master->seat.pointer->y + device->rel.dy);
 225                 device->pending_events &= ~EVDEV_RELATIVE_MOTION;
 226                 device->rel.dx = 0;
 227                 device->rel.dy = 0;
 228         }
 229         if (device->pending_events & EVDEV_ABSOLUTE_MT_DOWN) {
 230                 notify_touch(&master->seat, time,
 231                              device->mt.slot,
 232                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 233                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 234                              WL_TOUCH_DOWN);
 235                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 236                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 237         }
 238         if (device->pending_events & EVDEV_ABSOLUTE_MT_MOTION) {
 239                 notify_touch(&master->seat, time,
 240                              device->mt.slot,
 241                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 242                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 243                              WL_TOUCH_MOTION);
 244                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 245                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 246         }
 247         if (device->pending_events & EVDEV_ABSOLUTE_MT_UP) {
 248                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 249                              WL_TOUCH_UP);
 250                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_UP;
 251         }
 252         if (device->pending_events & EVDEV_ABSOLUTE_MOTION) {
 253                 notify_motion(&master->seat, time,
 254                               wl_fixed_from_int(device->abs.x),
 255                               wl_fixed_from_int(device->abs.y));
 256                 device->pending_events &= ~EVDEV_ABSOLUTE_MOTION;
 257         }
 258 }
 259
 260 static void
 261 fallback_process(struct evdev_dispatch *dispatch,
 262                  struct evdev_input_device *device,
 263                  struct input_event *event,
 264                  uint32_t time)
 265 {
 266         switch (event->type) {
 267         case EV_REL:
 268                 evdev_process_relative(device, event, time);
 269                 break;
 270         case EV_ABS:
 271                 evdev_process_absolute(device, event);
 272                 break;
 273         case EV_KEY:
 274                 evdev_process_key(device, event, time);
 275                 break;
 276         }
 277 }
 278
 279 static void
 280 fallback_destroy(struct evdev_dispatch *dispatch)
 281 {
 282         free(dispatch);
 283 }
 284
 285 struct evdev_dispatch_interface fallback_interface = {
 286         fallback_process,
 287         fallback_destroy
 288 };
 289
 290 static struct evdev_dispatch *
 291 fallback_dispatch_create(void)
 292 {
 293         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 294         if (dispatch == NULL)
 295                 return NULL;
 296
 297         dispatch->interface = &fallback_interface;
 298
 299         return dispatch;
 300 }
 301
 302 static void
 303 evdev_process_events(struct evdev_input_device *device,
 304                      struct input_event *ev, int count)
 305 {
 306         struct evdev_dispatch *dispatch = device->dispatch;
 307         struct input_event *e, *end;
 308         uint32_t time = 0;
 309
 310         device->pending_events = 0;
 311
 312         e = ev;
 313         end = e + count;
 314         for (e = ev; e < end; e++) {
 315                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 316
 317                 /* we try to minimize the amount of notifications to be
 318                  * forwarded to the compositor, so we accumulate motion
 319                  * events and send as a bunch */
 320                 if (!is_motion_event(e))
 321                         evdev_flush_motion(device, time);
 322
 323                 dispatch->interface->process(dispatch, device, e, time);
 324         }
 325
 326         evdev_flush_motion(device, time);
 327 }
 328
 329 static int
 330 evdev_input_device_data(int fd, uint32_t mask, void *data)
 331 {
 332         struct weston_compositor *ec;
 333         struct evdev_input_device *device = data;
 334         struct input_event ev[32];
 335         int len;
 336
 337         ec = device->master->base.compositor;
 338         if (!ec->focus)
 339                 return 1;
 340
 341         /* If the compositor is repainting, this function is called only once
 342          * per frame and we have to process all the events available on the
 343          * fd, otherwise there will be input lag. */
 344         do {
 345                 if (device->mtdev)
 346                         len = mtdev_get(device->mtdev, fd, ev,
 347                                         ARRAY_LENGTH(ev)) *
 348                                 sizeof (struct input_event);
 349                 else
 350                         len = read(fd, &ev, sizeof ev);
 351
 352                 if (len < 0 || len % sizeof ev[0] != 0) {
 353                         /* FIXME: call device_removed when errno is ENODEV. */
 354                         return 1;
 355                 }
 356
 357                 evdev_process_events(device, ev, len / sizeof ev[0]);
 358
 359         } while (len > 0);
 360
 361         return 1;
 362 }
 363
 364 static int
 365 evdev_configure_device(struct evdev_input_device *device)
 366 {
 367         struct input_absinfo absinfo;
 368         unsigned long ev_bits[NBITS(EV_MAX)];
 369         unsigned long abs_bits[NBITS(ABS_MAX)];
 370         unsigned long rel_bits[NBITS(REL_MAX)];
 371         unsigned long key_bits[NBITS(KEY_MAX)];
 372         int has_key, has_abs;
 373         unsigned int i;
 374
 375         has_key = 0;
 376         has_abs = 0;
 377         device->caps = 0;
 378
 379         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 380         if (TEST_BIT(ev_bits, EV_ABS)) {
 381                 has_abs = 1;
 382
 383                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 384                       abs_bits);
 385                 if (TEST_BIT(abs_bits, ABS_X)) {
 386                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 387                         device->abs.min_x = absinfo.minimum;
 388                         device->abs.max_x = absinfo.maximum;
 389                         device->caps |= EVDEV_MOTION_ABS;
 390                 }
 391                 if (TEST_BIT(abs_bits, ABS_Y)) {
 392                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 393                         device->abs.min_y = absinfo.minimum;
 394                         device->abs.max_y = absinfo.maximum;
 395                         device->caps |= EVDEV_MOTION_ABS;
 396                 }
 397                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 398                         device->is_mt = 1;
 399                         device->mt.slot = 0;
 400                         device->caps |= EVDEV_TOUCH;
 401                 }
 402         }
 403         if (TEST_BIT(ev_bits, EV_REL)) {
 404                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 405                       rel_bits);
 406                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 407                         device->caps |= EVDEV_MOTION_REL;
 408         }
 409         if (TEST_BIT(ev_bits, EV_KEY)) {
 410                 has_key = 1;
 411                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 412                       key_bits);
 413                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 414                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 415                     has_abs)
 416                         device->dispatch = evdev_touchpad_create(device);
 417                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 418                         if (i >= BTN_MISC && i < KEY_OK)
 419                                 continue;
 420                         if (TEST_BIT(key_bits, i)) {
 421                                 device->caps |= EVDEV_KEYBOARD;
 422                                 break;
 423                         }
 424                 }
 425                 for (i = BTN_MISC; i < KEY_OK; i++) {
 426                         if (TEST_BIT(key_bits, i)) {
 427                                 device->caps |= EVDEV_BUTTON;
 428                                 break;
 429                         }
 430                 }
 431         }
 432
 433         /* This rule tries to catch accelerometer devices and opt out. We may
 434          * want to adjust the protocol later adding a proper event for dealing
 435          * with accelerometers and implement here accordingly */
 436         if (has_abs && !has_key)
 437                 return -1;
 438
 439         return 0;
 440 }
 441
 442 static struct evdev_input_device *
 443 evdev_input_device_create(struct evdev_seat *master,
 444                           struct wl_display *display, const char *path)
 445 {
 446         struct evdev_input_device *device;
 447         struct weston_compositor *ec;
 448
 449         device = malloc(sizeof *device);
 450         if (device == NULL)
 451                 return NULL;
 452
 453         ec = master->base.compositor;
 454         device->output =
 455                 container_of(ec->output_list.next, struct weston_output, link);
 456
 457         device->master = master;
 458         device->is_mt = 0;
 459         device->mtdev = NULL;
 460         device->devnode = strdup(path);
 461         device->mt.slot = -1;
 462         device->rel.dx = 0;
 463         device->rel.dy = 0;
 464         device->dispatch = NULL;
 465
 466         /* Use non-blocking mode so that we can loop on read on
 467          * evdev_input_device_data() until all events on the fd are
 468          * read.  mtdev_get() also expects this. */
 469         device->fd = weston_launcher_open(ec, path, O_RDONLY | O_NONBLOCK);
 470         if (device->fd < 0)
 471                 goto err0;
 472
 473         if (evdev_configure_device(device) == -1)
 474                 goto err1;
 475
 476         /* If the dispatch was not set up use the fallback. */
 477         if (device->dispatch == NULL)
 478                 device->dispatch = fallback_dispatch_create();
 479         if (device->dispatch == NULL)
 480                 goto err1;
 481
 482
 483         if (device->is_mt) {
 484                 device->mtdev = mtdev_new_open(device->fd);
 485                 if (!device->mtdev)
 486                         fprintf(stderr, "mtdev failed to open for %s\n", path);
 487         }
 488
 489         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 490                                               WL_EVENT_READABLE,
 491                                               evdev_input_device_data, device);
 492         if (device->source == NULL)
 493                 goto err2;
 494
 495         wl_list_insert(master->devices_list.prev, &device->link);
 496
 497         return device;
 498
 499 err2:
 500         device->dispatch->interface->destroy(device->dispatch);
 501 err1:
 502         close(device->fd);
 503 err0:
 504         free(device->devnode);
 505         free(device);
 506         return NULL;
 507 }
 508
 509 static const char default_seat[] = "seat0";
 510
 511 static void
 512 device_added(struct udev_device *udev_device, struct evdev_seat *master)
 513 {
 514         struct weston_compositor *c;
 515         const char *devnode;
 516         const char *device_seat;
 517
 518         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 519         if (!device_seat)
 520                 device_seat = default_seat;
 521
 522         if (strcmp(device_seat, master->seat_id))
 523                 return;
 524
 525         c = master->base.compositor;
 526         devnode = udev_device_get_devnode(udev_device);
 527         evdev_input_device_create(master, c->wl_display, devnode);
 528 }
 529
 530 static void
 531 device_removed(struct evdev_input_device *device)
 532 {
 533         struct evdev_dispatch *dispatch;
 534
 535         dispatch = device->dispatch;
 536         if (dispatch)
 537                 dispatch->interface->destroy(dispatch);
 538
 539         wl_event_source_remove(device->source);
 540         wl_list_remove(&device->link);
 541         if (device->mtdev)
 542                 mtdev_close_delete(device->mtdev);
 543         close(device->fd);
 544         free(device->devnode);
 545         free(device);
 546 }
 547
 548 static void
 549 evdev_notify_keyboard_focus(struct evdev_seat *seat)
 550 {
 551         struct evdev_input_device *device;
 552         struct wl_array keys;
 553         unsigned int i, set;
 554         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 555         uint32_t *k;
 556         int ret;
 557
 558         memset(all_keys, 0, sizeof all_keys);
 559         wl_list_for_each(device, &seat->devices_list, link) {
 560                 memset(evdev_keys, 0, sizeof evdev_keys);
 561                 ret = ioctl(device->fd,
 562                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 563                 if (ret < 0) {
 564                         fprintf(stderr, "failed to get keys for device %s\n",
 565                                 device->devnode);
 566                         continue;
 567                 }
 568                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 569                         all_keys[i] |= evdev_keys[i];
 570         }
 571
 572         wl_array_init(&keys);
 573         for (i = 0; i < KEY_CNT; i++) {
 574                 set = all_keys[i >> 3] & (1 << (i & 7));
 575                 if (set) {
 576                         k = wl_array_add(&keys, sizeof *k);
 577                         *k = i;
 578                 }
 579         }
 580
 581         notify_keyboard_focus(&seat->base.seat, &keys);
 582
 583         wl_array_release(&keys);
 584 }
 585
 586 void
 587 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 588 {
 589         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 590         struct udev_enumerate *e;
 591         struct udev_list_entry *entry;
 592         struct udev_device *device;
 593         const char *path, *sysname;
 594
 595         e = udev_enumerate_new(udev);
 596         udev_enumerate_add_match_subsystem(e, "input");
 597         udev_enumerate_scan_devices(e);
 598         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 599                 path = udev_list_entry_get_name(entry);
 600                 device = udev_device_new_from_syspath(udev, path);
 601
 602                 sysname = udev_device_get_sysname(device);
 603                 if (strncmp("event", sysname, 5) != 0) {
 604                         udev_device_unref(device);
 605                         continue;
 606                 }
 607
 608                 device_added(device, seat);
 609
 610                 udev_device_unref(device);
 611         }
 612         udev_enumerate_unref(e);
 613
 614         evdev_notify_keyboard_focus(seat);
 615
 616         if (wl_list_empty(&seat->devices_list)) {
 617                 fprintf(stderr,
 618                         "warning: no input devices on entering Weston. "
 619                         "Possible causes:\n"
 620                         "\t- no permissions to read /dev/input/event*\n"
 621                         "\t- seats misconfigured "
 622                         "(Weston backend option 'seat', "
 623                         "udev device property ID_SEAT)\n");
 624         }
 625 }
 626
 627 static int
 628 evdev_udev_handler(int fd, uint32_t mask, void *data)
 629 {
 630         struct evdev_seat *master = data;
 631         struct udev_device *udev_device;
 632         struct evdev_input_device *device, *next;
 633         const char *action;
 634         const char *devnode;
 635
 636         udev_device = udev_monitor_receive_device(master->udev_monitor);
 637         if (!udev_device)
 638                 return 1;
 639
 640         action = udev_device_get_action(udev_device);
 641         if (action) {
 642                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 643                         return 0;
 644
 645                 if (!strcmp(action, "add")) {
 646                         device_added(udev_device, master);
 647                 }
 648                 else if (!strcmp(action, "remove")) {
 649                         devnode = udev_device_get_devnode(udev_device);
 650                         wl_list_for_each_safe(device, next,
 651                                               &master->devices_list, link)
 652                                 if (!strcmp(device->devnode, devnode)) {
 653                                         device_removed(device);
 654                                         break;
 655                                 }
 656                 }
 657         }
 658         udev_device_unref(udev_device);
 659
 660         return 0;
 661 }
 662
 663 int
 664 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 665 {
 666         struct evdev_seat *master = (struct evdev_seat *) seat_base;
 667         struct wl_event_loop *loop;
 668         struct weston_compositor *c = master->base.compositor;
 669         int fd;
 670
 671         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 672         if (!master->udev_monitor) {
 673                 fprintf(stderr, "udev: failed to create the udev monitor\n");
 674                 return 0;
 675         }
 676
 677         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 678                         "input", NULL);
 679
 680         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 681                 fprintf(stderr, "udev: failed to bind the udev monitor\n");
 682                 udev_monitor_unref(master->udev_monitor);
 683                 return 0;
 684         }
 685
 686         loop = wl_display_get_event_loop(c->wl_display);
 687         fd = udev_monitor_get_fd(master->udev_monitor);
 688         master->udev_monitor_source =
 689                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 690                                      evdev_udev_handler, master);
 691         if (!master->udev_monitor_source) {
 692                 udev_monitor_unref(master->udev_monitor);
 693                 return 0;
 694         }
 695
 696         return 1;
 697 }
 698
 699 void
 700 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 701 {
 702         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 703
 704         if (!seat->udev_monitor)
 705                 return;
 706
 707         udev_monitor_unref(seat->udev_monitor);
 708         seat->udev_monitor = NULL;
 709         wl_event_source_remove(seat->udev_monitor_source);
 710         seat->udev_monitor_source = NULL;
 711 }
 712
 713 void
 714 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 715                    const char *seat_id)
 716 {
 717         struct evdev_seat *seat;
 718
 719         seat = malloc(sizeof *seat);
 720         if (seat == NULL)
 721                 return;
 722
 723         memset(seat, 0, sizeof *seat);
 724         weston_seat_init(&seat->base, c);
 725         seat->base.led_update = evdev_led_update;
 726
 727         wl_list_init(&seat->devices_list);
 728         seat->seat_id = strdup(seat_id);
 729         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 730                 free(seat->seat_id);
 731                 free(seat);
 732                 return;
 733         }
 734
 735         evdev_add_devices(udev, &seat->base);
 736
 737         c->seat = &seat->base;
 738 }
 739
 740 void
 741 evdev_remove_devices(struct weston_seat *seat_base)
 742 {
 743         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 744         struct evdev_input_device *device, *next;
 745
 746         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 747                 device_removed(device);
 748
 749         notify_keyboard_focus(&seat->base.seat, NULL);
 750 }
 751
 752 void
 753 evdev_input_destroy(struct weston_seat *seat_base)
 754 {
 755         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 756
 757         evdev_remove_devices(seat_base);
 758         evdev_disable_udev_monitor(&seat->base);
 759
 760         wl_list_remove(&seat->base.link);
 761         free(seat->seat_id);
 762         free(seat);
 763 }