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,
  90                            e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
  91                                       WL_KEYBOARD_KEY_STATE_RELEASED);
  92                 break;
  93         }
  94 }
  95
  96 static void
  97 evdev_process_touch(struct evdev_input_device *device,
  98                     struct input_event *e)
  99 {
 100         const int screen_width = device->output->current->width;
 101         const int screen_height = device->output->current->height;
 102
 103         switch (e->code) {
 104         case ABS_MT_SLOT:
 105                 device->mt.slot = e->value;
 106                 break;
 107         case ABS_MT_TRACKING_ID:
 108                 if (e->value >= 0)
 109                         device->pending_events |= EVDEV_ABSOLUTE_MT_DOWN;
 110                 else
 111                         device->pending_events |= EVDEV_ABSOLUTE_MT_UP;
 112                 break;
 113         case ABS_MT_POSITION_X:
 114                 device->mt.x[device->mt.slot] =
 115                         (e->value - device->abs.min_x) * screen_width /
 116                         (device->abs.max_x - device->abs.min_x) +
 117                         device->output->x;
 118                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 119                 break;
 120         case ABS_MT_POSITION_Y:
 121                 device->mt.y[device->mt.slot] =
 122                         (e->value - device->abs.min_y) * screen_height /
 123                         (device->abs.max_y - device->abs.min_y) +
 124                         device->output->y;
 125                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 126                 break;
 127         }
 128 }
 129
 130 static inline void
 131 evdev_process_absolute_motion(struct evdev_input_device *device,
 132                               struct input_event *e)
 133 {
 134         const int screen_width = device->output->current->width;
 135         const int screen_height = device->output->current->height;
 136
 137         switch (e->code) {
 138         case ABS_X:
 139                 device->abs.x =
 140                         (e->value - device->abs.min_x) * screen_width /
 141                         (device->abs.max_x - device->abs.min_x) +
 142                         device->output->x;
 143                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 144                 break;
 145         case ABS_Y:
 146                 device->abs.y =
 147                         (e->value - device->abs.min_y) * screen_height /
 148                         (device->abs.max_y - device->abs.min_y) +
 149                         device->output->y;
 150                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 151                 break;
 152         }
 153 }
 154
 155 static inline void
 156 evdev_process_relative(struct evdev_input_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                 notify_axis(&device->master->base.seat,
 170                               time,
 171                               WL_POINTER_AXIS_VERTICAL_SCROLL,
 172                               wl_fixed_from_int(e->value));
 173                 break;
 174         case REL_HWHEEL:
 175                 notify_axis(&device->master->base.seat,
 176                               time,
 177                               WL_POINTER_AXIS_HORIZONTAL_SCROLL,
 178                               wl_fixed_from_int(e->value));
 179                 break;
 180         }
 181 }
 182
 183 static inline void
 184 evdev_process_absolute(struct evdev_input_device *device,
 185                        struct input_event *e)
 186 {
 187         if (device->is_mt) {
 188                 evdev_process_touch(device, e);
 189         } else {
 190                 evdev_process_absolute_motion(device, e);
 191         }
 192 }
 193
 194 static int
 195 is_motion_event(struct input_event *e)
 196 {
 197         switch (e->type) {
 198         case EV_REL:
 199                 switch (e->code) {
 200                 case REL_X:
 201                 case REL_Y:
 202                         return 1;
 203                 }
 204         case EV_ABS:
 205                 switch (e->code) {
 206                 case ABS_X:
 207                 case ABS_Y:
 208                 case ABS_MT_POSITION_X:
 209                 case ABS_MT_POSITION_Y:
 210                         return 1;
 211                 }
 212         }
 213
 214         return 0;
 215 }
 216
 217 static void
 218 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 219 {
 220         struct weston_seat *master = &device->master->base;
 221
 222         if (!device->pending_events)
 223                 return;
 224
 225         if (device->pending_events & EVDEV_RELATIVE_MOTION) {
 226                 notify_motion(&master->seat, time,
 227                               master->seat.pointer->x + device->rel.dx,
 228                               master->seat.pointer->y + device->rel.dy);
 229                 device->pending_events &= ~EVDEV_RELATIVE_MOTION;
 230                 device->rel.dx = 0;
 231                 device->rel.dy = 0;
 232         }
 233         if (device->pending_events & EVDEV_ABSOLUTE_MT_DOWN) {
 234                 notify_touch(&master->seat, time,
 235                              device->mt.slot,
 236                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 237                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 238                              WL_TOUCH_DOWN);
 239                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 240                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 241         }
 242         if (device->pending_events & EVDEV_ABSOLUTE_MT_MOTION) {
 243                 notify_touch(&master->seat, time,
 244                              device->mt.slot,
 245                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 246                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 247                              WL_TOUCH_MOTION);
 248                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 249                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 250         }
 251         if (device->pending_events & EVDEV_ABSOLUTE_MT_UP) {
 252                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 253                              WL_TOUCH_UP);
 254                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_UP;
 255         }
 256         if (device->pending_events & EVDEV_ABSOLUTE_MOTION) {
 257                 notify_motion(&master->seat, time,
 258                               wl_fixed_from_int(device->abs.x),
 259                               wl_fixed_from_int(device->abs.y));
 260                 device->pending_events &= ~EVDEV_ABSOLUTE_MOTION;
 261         }
 262 }
 263
 264 static void
 265 fallback_process(struct evdev_dispatch *dispatch,
 266                  struct evdev_input_device *device,
 267                  struct input_event *event,
 268                  uint32_t time)
 269 {
 270         switch (event->type) {
 271         case EV_REL:
 272                 evdev_process_relative(device, event, time);
 273                 break;
 274         case EV_ABS:
 275                 evdev_process_absolute(device, event);
 276                 break;
 277         case EV_KEY:
 278                 evdev_process_key(device, event, time);
 279                 break;
 280         }
 281 }
 282
 283 static void
 284 fallback_destroy(struct evdev_dispatch *dispatch)
 285 {
 286         free(dispatch);
 287 }
 288
 289 struct evdev_dispatch_interface fallback_interface = {
 290         fallback_process,
 291         fallback_destroy
 292 };
 293
 294 static struct evdev_dispatch *
 295 fallback_dispatch_create(void)
 296 {
 297         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 298         if (dispatch == NULL)
 299                 return NULL;
 300
 301         dispatch->interface = &fallback_interface;
 302
 303         return dispatch;
 304 }
 305
 306 static void
 307 evdev_process_events(struct evdev_input_device *device,
 308                      struct input_event *ev, int count)
 309 {
 310         struct evdev_dispatch *dispatch = device->dispatch;
 311         struct input_event *e, *end;
 312         uint32_t time = 0;
 313
 314         device->pending_events = 0;
 315
 316         e = ev;
 317         end = e + count;
 318         for (e = ev; e < end; e++) {
 319                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 320
 321                 /* we try to minimize the amount of notifications to be
 322                  * forwarded to the compositor, so we accumulate motion
 323                  * events and send as a bunch */
 324                 if (!is_motion_event(e))
 325                         evdev_flush_motion(device, time);
 326
 327                 dispatch->interface->process(dispatch, device, e, time);
 328         }
 329
 330         evdev_flush_motion(device, time);
 331 }
 332
 333 static int
 334 evdev_input_device_data(int fd, uint32_t mask, void *data)
 335 {
 336         struct weston_compositor *ec;
 337         struct evdev_input_device *device = data;
 338         struct input_event ev[32];
 339         int len;
 340
 341         ec = device->master->base.compositor;
 342         if (!ec->focus)
 343                 return 1;
 344
 345         /* If the compositor is repainting, this function is called only once
 346          * per frame and we have to process all the events available on the
 347          * fd, otherwise there will be input lag. */
 348         do {
 349                 if (device->mtdev)
 350                         len = mtdev_get(device->mtdev, fd, ev,
 351                                         ARRAY_LENGTH(ev)) *
 352                                 sizeof (struct input_event);
 353                 else
 354                         len = read(fd, &ev, sizeof ev);
 355
 356                 if (len < 0 || len % sizeof ev[0] != 0) {
 357                         /* FIXME: call device_removed when errno is ENODEV. */
 358                         return 1;
 359                 }
 360
 361                 evdev_process_events(device, ev, len / sizeof ev[0]);
 362
 363         } while (len > 0);
 364
 365         return 1;
 366 }
 367
 368 static int
 369 evdev_configure_device(struct evdev_input_device *device)
 370 {
 371         struct input_absinfo absinfo;
 372         unsigned long ev_bits[NBITS(EV_MAX)];
 373         unsigned long abs_bits[NBITS(ABS_MAX)];
 374         unsigned long rel_bits[NBITS(REL_MAX)];
 375         unsigned long key_bits[NBITS(KEY_MAX)];
 376         int has_key, has_abs;
 377         unsigned int i;
 378
 379         has_key = 0;
 380         has_abs = 0;
 381         device->caps = 0;
 382
 383         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 384         if (TEST_BIT(ev_bits, EV_ABS)) {
 385                 has_abs = 1;
 386
 387                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 388                       abs_bits);
 389                 if (TEST_BIT(abs_bits, ABS_X)) {
 390                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 391                         device->abs.min_x = absinfo.minimum;
 392                         device->abs.max_x = absinfo.maximum;
 393                         device->caps |= EVDEV_MOTION_ABS;
 394                 }
 395                 if (TEST_BIT(abs_bits, ABS_Y)) {
 396                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 397                         device->abs.min_y = absinfo.minimum;
 398                         device->abs.max_y = absinfo.maximum;
 399                         device->caps |= EVDEV_MOTION_ABS;
 400                 }
 401                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 402                         device->is_mt = 1;
 403                         device->mt.slot = 0;
 404                         device->caps |= EVDEV_TOUCH;
 405                 }
 406         }
 407         if (TEST_BIT(ev_bits, EV_REL)) {
 408                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 409                       rel_bits);
 410                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 411                         device->caps |= EVDEV_MOTION_REL;
 412         }
 413         if (TEST_BIT(ev_bits, EV_KEY)) {
 414                 has_key = 1;
 415                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 416                       key_bits);
 417                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 418                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 419                     has_abs)
 420                         device->dispatch = evdev_touchpad_create(device);
 421                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 422                         if (i >= BTN_MISC && i < KEY_OK)
 423                                 continue;
 424                         if (TEST_BIT(key_bits, i)) {
 425                                 device->caps |= EVDEV_KEYBOARD;
 426                                 break;
 427                         }
 428                 }
 429                 for (i = BTN_MISC; i < KEY_OK; i++) {
 430                         if (TEST_BIT(key_bits, i)) {
 431                                 device->caps |= EVDEV_BUTTON;
 432                                 break;
 433                         }
 434                 }
 435         }
 436
 437         /* This rule tries to catch accelerometer devices and opt out. We may
 438          * want to adjust the protocol later adding a proper event for dealing
 439          * with accelerometers and implement here accordingly */
 440         if (has_abs && !has_key)
 441                 return -1;
 442
 443         if ((device->caps &
 444              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON)))
 445                 weston_seat_init_pointer(&device->master->base);
 446         if ((device->caps & EVDEV_KEYBOARD))
 447                 weston_seat_init_keyboard(&device->master->base, NULL);
 448         if ((device->caps & EVDEV_TOUCH))
 449                 weston_seat_init_touch(&device->master->base);
 450
 451         return 0;
 452 }
 453
 454 static struct evdev_input_device *
 455 evdev_input_device_create(struct evdev_seat *master,
 456                           struct wl_display *display, const char *path)
 457 {
 458         struct evdev_input_device *device;
 459         struct weston_compositor *ec;
 460
 461         device = malloc(sizeof *device);
 462         if (device == NULL)
 463                 return NULL;
 464
 465         ec = master->base.compositor;
 466         device->output =
 467                 container_of(ec->output_list.next, struct weston_output, link);
 468
 469         device->master = master;
 470         device->is_mt = 0;
 471         device->mtdev = NULL;
 472         device->devnode = strdup(path);
 473         device->mt.slot = -1;
 474         device->rel.dx = 0;
 475         device->rel.dy = 0;
 476         device->dispatch = NULL;
 477
 478         /* Use non-blocking mode so that we can loop on read on
 479          * evdev_input_device_data() until all events on the fd are
 480          * read.  mtdev_get() also expects this. */
 481         device->fd = weston_launcher_open(ec, path, O_RDONLY | O_NONBLOCK);
 482         if (device->fd < 0)
 483                 goto err0;
 484
 485         if (evdev_configure_device(device) == -1)
 486                 goto err1;
 487
 488         /* If the dispatch was not set up use the fallback. */
 489         if (device->dispatch == NULL)
 490                 device->dispatch = fallback_dispatch_create();
 491         if (device->dispatch == NULL)
 492                 goto err1;
 493
 494
 495         if (device->is_mt) {
 496                 device->mtdev = mtdev_new_open(device->fd);
 497                 if (!device->mtdev)
 498                         fprintf(stderr, "mtdev failed to open for %s\n", path);
 499         }
 500
 501         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 502                                               WL_EVENT_READABLE,
 503                                               evdev_input_device_data, device);
 504         if (device->source == NULL)
 505                 goto err2;
 506
 507         wl_list_insert(master->devices_list.prev, &device->link);
 508
 509         return device;
 510
 511 err2:
 512         device->dispatch->interface->destroy(device->dispatch);
 513 err1:
 514         close(device->fd);
 515 err0:
 516         free(device->devnode);
 517         free(device);
 518         return NULL;
 519 }
 520
 521 static const char default_seat[] = "seat0";
 522
 523 static void
 524 device_added(struct udev_device *udev_device, struct evdev_seat *master)
 525 {
 526         struct weston_compositor *c;
 527         const char *devnode;
 528         const char *device_seat;
 529
 530         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 531         if (!device_seat)
 532                 device_seat = default_seat;
 533
 534         if (strcmp(device_seat, master->seat_id))
 535                 return;
 536
 537         c = master->base.compositor;
 538         devnode = udev_device_get_devnode(udev_device);
 539         evdev_input_device_create(master, c->wl_display, devnode);
 540 }
 541
 542 static void
 543 device_removed(struct evdev_input_device *device)
 544 {
 545         struct evdev_dispatch *dispatch;
 546
 547         dispatch = device->dispatch;
 548         if (dispatch)
 549                 dispatch->interface->destroy(dispatch);
 550
 551         wl_event_source_remove(device->source);
 552         wl_list_remove(&device->link);
 553         if (device->mtdev)
 554                 mtdev_close_delete(device->mtdev);
 555         close(device->fd);
 556         free(device->devnode);
 557         free(device);
 558 }
 559
 560 static void
 561 evdev_notify_keyboard_focus(struct evdev_seat *seat)
 562 {
 563         struct evdev_input_device *device;
 564         struct wl_array keys;
 565         unsigned int i, set;
 566         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 567         uint32_t *k;
 568         int ret;
 569
 570         memset(all_keys, 0, sizeof all_keys);
 571         wl_list_for_each(device, &seat->devices_list, link) {
 572                 memset(evdev_keys, 0, sizeof evdev_keys);
 573                 ret = ioctl(device->fd,
 574                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 575                 if (ret < 0) {
 576                         fprintf(stderr, "failed to get keys for device %s\n",
 577                                 device->devnode);
 578                         continue;
 579                 }
 580                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 581                         all_keys[i] |= evdev_keys[i];
 582         }
 583
 584         wl_array_init(&keys);
 585         for (i = 0; i < KEY_CNT; i++) {
 586                 set = all_keys[i >> 3] & (1 << (i & 7));
 587                 if (set) {
 588                         k = wl_array_add(&keys, sizeof *k);
 589                         *k = i;
 590                 }
 591         }
 592
 593         notify_keyboard_focus(&seat->base.seat, &keys);
 594
 595         wl_array_release(&keys);
 596 }
 597
 598 void
 599 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 600 {
 601         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 602         struct udev_enumerate *e;
 603         struct udev_list_entry *entry;
 604         struct udev_device *device;
 605         const char *path, *sysname;
 606
 607         e = udev_enumerate_new(udev);
 608         udev_enumerate_add_match_subsystem(e, "input");
 609         udev_enumerate_scan_devices(e);
 610         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 611                 path = udev_list_entry_get_name(entry);
 612                 device = udev_device_new_from_syspath(udev, path);
 613
 614                 sysname = udev_device_get_sysname(device);
 615                 if (strncmp("event", sysname, 5) != 0) {
 616                         udev_device_unref(device);
 617                         continue;
 618                 }
 619
 620                 device_added(device, seat);
 621
 622                 udev_device_unref(device);
 623         }
 624         udev_enumerate_unref(e);
 625
 626         evdev_notify_keyboard_focus(seat);
 627
 628         if (wl_list_empty(&seat->devices_list)) {
 629                 fprintf(stderr,
 630                         "warning: no input devices on entering Weston. "
 631                         "Possible causes:\n"
 632                         "\t- no permissions to read /dev/input/event*\n"
 633                         "\t- seats misconfigured "
 634                         "(Weston backend option 'seat', "
 635                         "udev device property ID_SEAT)\n");
 636         }
 637 }
 638
 639 static int
 640 evdev_udev_handler(int fd, uint32_t mask, void *data)
 641 {
 642         struct evdev_seat *master = data;
 643         struct udev_device *udev_device;
 644         struct evdev_input_device *device, *next;
 645         const char *action;
 646         const char *devnode;
 647
 648         udev_device = udev_monitor_receive_device(master->udev_monitor);
 649         if (!udev_device)
 650                 return 1;
 651
 652         action = udev_device_get_action(udev_device);
 653         if (action) {
 654                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 655                         return 0;
 656
 657                 if (!strcmp(action, "add")) {
 658                         device_added(udev_device, master);
 659                 }
 660                 else if (!strcmp(action, "remove")) {
 661                         devnode = udev_device_get_devnode(udev_device);
 662                         wl_list_for_each_safe(device, next,
 663                                               &master->devices_list, link)
 664                                 if (!strcmp(device->devnode, devnode)) {
 665                                         device_removed(device);
 666                                         break;
 667                                 }
 668                 }
 669         }
 670         udev_device_unref(udev_device);
 671
 672         return 0;
 673 }
 674
 675 int
 676 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 677 {
 678         struct evdev_seat *master = (struct evdev_seat *) seat_base;
 679         struct wl_event_loop *loop;
 680         struct weston_compositor *c = master->base.compositor;
 681         int fd;
 682
 683         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 684         if (!master->udev_monitor) {
 685                 fprintf(stderr, "udev: failed to create the udev monitor\n");
 686                 return 0;
 687         }
 688
 689         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 690                         "input", NULL);
 691
 692         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 693                 fprintf(stderr, "udev: failed to bind the udev monitor\n");
 694                 udev_monitor_unref(master->udev_monitor);
 695                 return 0;
 696         }
 697
 698         loop = wl_display_get_event_loop(c->wl_display);
 699         fd = udev_monitor_get_fd(master->udev_monitor);
 700         master->udev_monitor_source =
 701                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 702                                      evdev_udev_handler, master);
 703         if (!master->udev_monitor_source) {
 704                 udev_monitor_unref(master->udev_monitor);
 705                 return 0;
 706         }
 707
 708         return 1;
 709 }
 710
 711 void
 712 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 713 {
 714         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 715
 716         if (!seat->udev_monitor)
 717                 return;
 718
 719         udev_monitor_unref(seat->udev_monitor);
 720         seat->udev_monitor = NULL;
 721         wl_event_source_remove(seat->udev_monitor_source);
 722         seat->udev_monitor_source = NULL;
 723 }
 724
 725 void
 726 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 727                    const char *seat_id)
 728 {
 729         struct evdev_seat *seat;
 730
 731         seat = malloc(sizeof *seat);
 732         if (seat == NULL)
 733                 return;
 734
 735         memset(seat, 0, sizeof *seat);
 736         weston_seat_init(&seat->base, c);
 737         seat->base.led_update = evdev_led_update;
 738
 739         wl_list_init(&seat->devices_list);
 740         seat->seat_id = strdup(seat_id);
 741         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 742                 free(seat->seat_id);
 743                 free(seat);
 744                 return;
 745         }
 746
 747         evdev_add_devices(udev, &seat->base);
 748
 749         c->seat = &seat->base;
 750 }
 751
 752 void
 753 evdev_remove_devices(struct weston_seat *seat_base)
 754 {
 755         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 756         struct evdev_input_device *device, *next;
 757
 758         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 759                 device_removed(device);
 760
 761         notify_keyboard_focus(&seat->base.seat, NULL);
 762 }
 763
 764 void
 765 evdev_input_destroy(struct weston_seat *seat_base)
 766 {
 767         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 768
 769         evdev_remove_devices(seat_base);
 770         evdev_disable_udev_monitor(&seat->base);
 771
 772         wl_list_remove(&seat->base.link);
 773         free(seat->seat_id);
 774         free(seat);
 775 }