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 <stdlib.h>
  24 #include <string.h>
  25 #include <linux/input.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <mtdev.h>
  29
  30 #include "compositor.h"
  31 #include "evdev.h"
  32 #include "evdev-private.h"
  33 #include "launcher-util.h"
  34 #include "log.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                            STATE_UPDATE_AUTOMATIC);
  93                 break;
  94         }
  95 }
  96
  97 static void
  98 evdev_process_touch(struct evdev_input_device *device,
  99                     struct input_event *e)
 100 {
 101         const int screen_width = device->output->current->width;
 102         const int screen_height = device->output->current->height;
 103
 104         switch (e->code) {
 105         case ABS_MT_SLOT:
 106                 device->mt.slot = e->value;
 107                 break;
 108         case ABS_MT_TRACKING_ID:
 109                 if (e->value >= 0)
 110                         device->pending_events |= EVDEV_ABSOLUTE_MT_DOWN;
 111                 else
 112                         device->pending_events |= EVDEV_ABSOLUTE_MT_UP;
 113                 break;
 114         case ABS_MT_POSITION_X:
 115                 device->mt.x[device->mt.slot] =
 116                         (e->value - device->abs.min_x) * screen_width /
 117                         (device->abs.max_x - device->abs.min_x) +
 118                         device->output->x;
 119                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 120                 break;
 121         case ABS_MT_POSITION_Y:
 122                 device->mt.y[device->mt.slot] =
 123                         (e->value - device->abs.min_y) * screen_height /
 124                         (device->abs.max_y - device->abs.min_y) +
 125                         device->output->y;
 126                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 127                 break;
 128         }
 129 }
 130
 131 static inline void
 132 evdev_process_absolute_motion(struct evdev_input_device *device,
 133                               struct input_event *e)
 134 {
 135         const int screen_width = device->output->current->width;
 136         const int screen_height = device->output->current->height;
 137
 138         switch (e->code) {
 139         case ABS_X:
 140                 device->abs.x =
 141                         (e->value - device->abs.min_x) * screen_width /
 142                         (device->abs.max_x - device->abs.min_x) +
 143                         device->output->x;
 144                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 145                 break;
 146         case ABS_Y:
 147                 device->abs.y =
 148                         (e->value - device->abs.min_y) * screen_height /
 149                         (device->abs.max_y - device->abs.min_y) +
 150                         device->output->y;
 151                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 152                 break;
 153         }
 154 }
 155
 156 static inline void
 157 evdev_process_relative(struct evdev_input_device *device,
 158                        struct input_event *e, uint32_t time)
 159 {
 160         switch (e->code) {
 161         case REL_X:
 162                 device->rel.dx += wl_fixed_from_int(e->value);
 163                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 164                 break;
 165         case REL_Y:
 166                 device->rel.dy += wl_fixed_from_int(e->value);
 167                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 168                 break;
 169         case REL_WHEEL:
 170                 notify_axis(&device->master->base.seat,
 171                               time,
 172                               WL_POINTER_AXIS_VERTICAL_SCROLL,
 173                               wl_fixed_from_int(e->value));
 174                 break;
 175         case REL_HWHEEL:
 176                 notify_axis(&device->master->base.seat,
 177                               time,
 178                               WL_POINTER_AXIS_HORIZONTAL_SCROLL,
 179                               wl_fixed_from_int(e->value));
 180                 break;
 181         }
 182 }
 183
 184 static inline void
 185 evdev_process_absolute(struct evdev_input_device *device,
 186                        struct input_event *e)
 187 {
 188         if (device->is_mt) {
 189                 evdev_process_touch(device, e);
 190         } else {
 191                 evdev_process_absolute_motion(device, e);
 192         }
 193 }
 194
 195 static int
 196 is_motion_event(struct input_event *e)
 197 {
 198         switch (e->type) {
 199         case EV_REL:
 200                 switch (e->code) {
 201                 case REL_X:
 202                 case REL_Y:
 203                         return 1;
 204                 }
 205         case EV_ABS:
 206                 switch (e->code) {
 207                 case ABS_X:
 208                 case ABS_Y:
 209                 case ABS_MT_POSITION_X:
 210                 case ABS_MT_POSITION_Y:
 211                         return 1;
 212                 }
 213         }
 214
 215         return 0;
 216 }
 217
 218 static void
 219 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 220 {
 221         struct weston_seat *master = &device->master->base;
 222
 223         if (!device->pending_events)
 224                 return;
 225
 226         if (device->pending_events & EVDEV_RELATIVE_MOTION) {
 227                 notify_motion(&master->seat, time,
 228                               master->seat.pointer->x + device->rel.dx,
 229                               master->seat.pointer->y + device->rel.dy);
 230                 device->pending_events &= ~EVDEV_RELATIVE_MOTION;
 231                 device->rel.dx = 0;
 232                 device->rel.dy = 0;
 233         }
 234         if (device->pending_events & EVDEV_ABSOLUTE_MT_DOWN) {
 235                 notify_touch(&master->seat, time,
 236                              device->mt.slot,
 237                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 238                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 239                              WL_TOUCH_DOWN);
 240                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 241                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 242         }
 243         if (device->pending_events & EVDEV_ABSOLUTE_MT_MOTION) {
 244                 notify_touch(&master->seat, time,
 245                              device->mt.slot,
 246                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 247                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 248                              WL_TOUCH_MOTION);
 249                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 250                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 251         }
 252         if (device->pending_events & EVDEV_ABSOLUTE_MT_UP) {
 253                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 254                              WL_TOUCH_UP);
 255                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_UP;
 256         }
 257         if (device->pending_events & EVDEV_ABSOLUTE_MOTION) {
 258                 notify_motion(&master->seat, time,
 259                               wl_fixed_from_int(device->abs.x),
 260                               wl_fixed_from_int(device->abs.y));
 261                 device->pending_events &= ~EVDEV_ABSOLUTE_MOTION;
 262         }
 263 }
 264
 265 static void
 266 fallback_process(struct evdev_dispatch *dispatch,
 267                  struct evdev_input_device *device,
 268                  struct input_event *event,
 269                  uint32_t time)
 270 {
 271         switch (event->type) {
 272         case EV_REL:
 273                 evdev_process_relative(device, event, time);
 274                 break;
 275         case EV_ABS:
 276                 evdev_process_absolute(device, event);
 277                 break;
 278         case EV_KEY:
 279                 evdev_process_key(device, event, time);
 280                 break;
 281         }
 282 }
 283
 284 static void
 285 fallback_destroy(struct evdev_dispatch *dispatch)
 286 {
 287         free(dispatch);
 288 }
 289
 290 struct evdev_dispatch_interface fallback_interface = {
 291         fallback_process,
 292         fallback_destroy
 293 };
 294
 295 static struct evdev_dispatch *
 296 fallback_dispatch_create(void)
 297 {
 298         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 299         if (dispatch == NULL)
 300                 return NULL;
 301
 302         dispatch->interface = &fallback_interface;
 303
 304         return dispatch;
 305 }
 306
 307 static void
 308 evdev_process_events(struct evdev_input_device *device,
 309                      struct input_event *ev, int count)
 310 {
 311         struct evdev_dispatch *dispatch = device->dispatch;
 312         struct input_event *e, *end;
 313         uint32_t time = 0;
 314
 315         device->pending_events = 0;
 316
 317         e = ev;
 318         end = e + count;
 319         for (e = ev; e < end; e++) {
 320                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 321
 322                 /* we try to minimize the amount of notifications to be
 323                  * forwarded to the compositor, so we accumulate motion
 324                  * events and send as a bunch */
 325                 if (!is_motion_event(e))
 326                         evdev_flush_motion(device, time);
 327
 328                 dispatch->interface->process(dispatch, device, e, time);
 329         }
 330
 331         evdev_flush_motion(device, time);
 332 }
 333
 334 static int
 335 evdev_input_device_data(int fd, uint32_t mask, void *data)
 336 {
 337         struct weston_compositor *ec;
 338         struct evdev_input_device *device = data;
 339         struct input_event ev[32];
 340         int len;
 341
 342         ec = device->master->base.compositor;
 343         if (!ec->focus)
 344                 return 1;
 345
 346         /* If the compositor is repainting, this function is called only once
 347          * per frame and we have to process all the events available on the
 348          * fd, otherwise there will be input lag. */
 349         do {
 350                 if (device->mtdev)
 351                         len = mtdev_get(device->mtdev, fd, ev,
 352                                         ARRAY_LENGTH(ev)) *
 353                                 sizeof (struct input_event);
 354                 else
 355                         len = read(fd, &ev, sizeof ev);
 356
 357                 if (len < 0 || len % sizeof ev[0] != 0) {
 358                         /* FIXME: call device_removed when errno is ENODEV. */
 359                         return 1;
 360                 }
 361
 362                 evdev_process_events(device, ev, len / sizeof ev[0]);
 363
 364         } while (len > 0);
 365
 366         return 1;
 367 }
 368
 369 static int
 370 evdev_configure_device(struct evdev_input_device *device)
 371 {
 372         struct input_absinfo absinfo;
 373         unsigned long ev_bits[NBITS(EV_MAX)];
 374         unsigned long abs_bits[NBITS(ABS_MAX)];
 375         unsigned long rel_bits[NBITS(REL_MAX)];
 376         unsigned long key_bits[NBITS(KEY_MAX)];
 377         int has_key, has_abs;
 378         unsigned int i;
 379
 380         has_key = 0;
 381         has_abs = 0;
 382         device->caps = 0;
 383
 384         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 385         if (TEST_BIT(ev_bits, EV_ABS)) {
 386                 has_abs = 1;
 387
 388                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 389                       abs_bits);
 390                 if (TEST_BIT(abs_bits, ABS_X)) {
 391                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 392                         device->abs.min_x = absinfo.minimum;
 393                         device->abs.max_x = absinfo.maximum;
 394                         device->caps |= EVDEV_MOTION_ABS;
 395                 }
 396                 if (TEST_BIT(abs_bits, ABS_Y)) {
 397                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 398                         device->abs.min_y = absinfo.minimum;
 399                         device->abs.max_y = absinfo.maximum;
 400                         device->caps |= EVDEV_MOTION_ABS;
 401                 }
 402                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 403                         device->is_mt = 1;
 404                         device->mt.slot = 0;
 405                         device->caps |= EVDEV_TOUCH;
 406                 }
 407         }
 408         if (TEST_BIT(ev_bits, EV_REL)) {
 409                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 410                       rel_bits);
 411                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 412                         device->caps |= EVDEV_MOTION_REL;
 413         }
 414         if (TEST_BIT(ev_bits, EV_KEY)) {
 415                 has_key = 1;
 416                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 417                       key_bits);
 418                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 419                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 420                     has_abs)
 421                         device->dispatch = evdev_touchpad_create(device);
 422                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 423                         if (i >= BTN_MISC && i < KEY_OK)
 424                                 continue;
 425                         if (TEST_BIT(key_bits, i)) {
 426                                 device->caps |= EVDEV_KEYBOARD;
 427                                 break;
 428                         }
 429                 }
 430                 for (i = BTN_MISC; i < KEY_OK; i++) {
 431                         if (TEST_BIT(key_bits, i)) {
 432                                 device->caps |= EVDEV_BUTTON;
 433                                 break;
 434                         }
 435                 }
 436         }
 437         if (TEST_BIT(ev_bits, EV_LED)) {
 438                 device->caps |= EVDEV_KEYBOARD;
 439         }
 440
 441         /* This rule tries to catch accelerometer devices and opt out. We may
 442          * want to adjust the protocol later adding a proper event for dealing
 443          * with accelerometers and implement here accordingly */
 444         if (has_abs && !has_key && !device->is_mt)
 445                 return -1;
 446
 447         if ((device->caps &
 448              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON)))
 449                 weston_seat_init_pointer(&device->master->base);
 450         if ((device->caps & EVDEV_KEYBOARD))
 451                 weston_seat_init_keyboard(&device->master->base, NULL);
 452         if ((device->caps & EVDEV_TOUCH))
 453                 weston_seat_init_touch(&device->master->base);
 454
 455         return 0;
 456 }
 457
 458 static struct evdev_input_device *
 459 evdev_input_device_create(struct evdev_seat *master,
 460                           struct wl_display *display, const char *path)
 461 {
 462         struct evdev_input_device *device;
 463         struct weston_compositor *ec;
 464
 465         device = malloc(sizeof *device);
 466         if (device == NULL)
 467                 return NULL;
 468
 469         ec = master->base.compositor;
 470         device->output =
 471                 container_of(ec->output_list.next, struct weston_output, link);
 472
 473         device->master = master;
 474         device->is_mt = 0;
 475         device->mtdev = NULL;
 476         device->devnode = strdup(path);
 477         device->mt.slot = -1;
 478         device->rel.dx = 0;
 479         device->rel.dy = 0;
 480         device->dispatch = NULL;
 481
 482         /* Use non-blocking mode so that we can loop on read on
 483          * evdev_input_device_data() until all events on the fd are
 484          * read.  mtdev_get() also expects this. */
 485         device->fd = weston_launcher_open(ec, path, O_RDWR | O_NONBLOCK);
 486         if (device->fd < 0)
 487                 goto err0;
 488
 489         if (evdev_configure_device(device) == -1)
 490                 goto err1;
 491
 492         /* If the dispatch was not set up use the fallback. */
 493         if (device->dispatch == NULL)
 494                 device->dispatch = fallback_dispatch_create();
 495         if (device->dispatch == NULL)
 496                 goto err1;
 497
 498
 499         if (device->is_mt) {
 500                 device->mtdev = mtdev_new_open(device->fd);
 501                 if (!device->mtdev)
 502                         weston_log("mtdev failed to open for %s\n", path);
 503         }
 504
 505         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 506                                               WL_EVENT_READABLE,
 507                                               evdev_input_device_data, device);
 508         if (device->source == NULL)
 509                 goto err2;
 510
 511         wl_list_insert(master->devices_list.prev, &device->link);
 512
 513         return device;
 514
 515 err2:
 516         device->dispatch->interface->destroy(device->dispatch);
 517 err1:
 518         close(device->fd);
 519 err0:
 520         free(device->devnode);
 521         free(device);
 522         return NULL;
 523 }
 524
 525 static const char default_seat[] = "seat0";
 526
 527 static void
 528 device_added(struct udev_device *udev_device, struct evdev_seat *master)
 529 {
 530         struct weston_compositor *c;
 531         const char *devnode;
 532         const char *device_seat;
 533
 534         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 535         if (!device_seat)
 536                 device_seat = default_seat;
 537
 538         if (strcmp(device_seat, master->seat_id))
 539                 return;
 540
 541         c = master->base.compositor;
 542         devnode = udev_device_get_devnode(udev_device);
 543         evdev_input_device_create(master, c->wl_display, devnode);
 544 }
 545
 546 static void
 547 device_removed(struct evdev_input_device *device)
 548 {
 549         struct evdev_dispatch *dispatch;
 550
 551         dispatch = device->dispatch;
 552         if (dispatch)
 553                 dispatch->interface->destroy(dispatch);
 554
 555         wl_event_source_remove(device->source);
 556         wl_list_remove(&device->link);
 557         if (device->mtdev)
 558                 mtdev_close_delete(device->mtdev);
 559         close(device->fd);
 560         free(device->devnode);
 561         free(device);
 562 }
 563
 564 static void
 565 evdev_notify_keyboard_focus(struct evdev_seat *seat)
 566 {
 567         struct evdev_input_device *device;
 568         struct wl_array keys;
 569         unsigned int i, set;
 570         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 571         uint32_t *k;
 572         int ret;
 573
 574         memset(all_keys, 0, sizeof all_keys);
 575         wl_list_for_each(device, &seat->devices_list, link) {
 576                 memset(evdev_keys, 0, sizeof evdev_keys);
 577                 ret = ioctl(device->fd,
 578                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 579                 if (ret < 0) {
 580                         weston_log("failed to get keys for device %s\n",
 581                                 device->devnode);
 582                         continue;
 583                 }
 584                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 585                         all_keys[i] |= evdev_keys[i];
 586         }
 587
 588         wl_array_init(&keys);
 589         for (i = 0; i < KEY_CNT; i++) {
 590                 set = all_keys[i >> 3] & (1 << (i & 7));
 591                 if (set) {
 592                         k = wl_array_add(&keys, sizeof *k);
 593                         *k = i;
 594                 }
 595         }
 596
 597         notify_keyboard_focus_in(&seat->base.seat, &keys,
 598                                  STATE_UPDATE_AUTOMATIC);
 599
 600         wl_array_release(&keys);
 601 }
 602
 603 void
 604 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 605 {
 606         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 607         struct udev_enumerate *e;
 608         struct udev_list_entry *entry;
 609         struct udev_device *device;
 610         const char *path, *sysname;
 611
 612         e = udev_enumerate_new(udev);
 613         udev_enumerate_add_match_subsystem(e, "input");
 614         udev_enumerate_scan_devices(e);
 615         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 616                 path = udev_list_entry_get_name(entry);
 617                 device = udev_device_new_from_syspath(udev, path);
 618
 619                 sysname = udev_device_get_sysname(device);
 620                 if (strncmp("event", sysname, 5) != 0) {
 621                         udev_device_unref(device);
 622                         continue;
 623                 }
 624
 625                 device_added(device, seat);
 626
 627                 udev_device_unref(device);
 628         }
 629         udev_enumerate_unref(e);
 630
 631         evdev_notify_keyboard_focus(seat);
 632
 633         if (wl_list_empty(&seat->devices_list)) {
 634                 weston_log(
 635                         "warning: no input devices on entering Weston. "
 636                         "Possible causes:\n"
 637                         "\t- no permissions to read /dev/input/event*\n"
 638                         "\t- seats misconfigured "
 639                         "(Weston backend option 'seat', "
 640                         "udev device property ID_SEAT)\n");
 641         }
 642 }
 643
 644 static int
 645 evdev_udev_handler(int fd, uint32_t mask, void *data)
 646 {
 647         struct evdev_seat *master = data;
 648         struct udev_device *udev_device;
 649         struct evdev_input_device *device, *next;
 650         const char *action;
 651         const char *devnode;
 652
 653         udev_device = udev_monitor_receive_device(master->udev_monitor);
 654         if (!udev_device)
 655                 return 1;
 656
 657         action = udev_device_get_action(udev_device);
 658         if (action) {
 659                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 660                         return 0;
 661
 662                 if (!strcmp(action, "add")) {
 663                         device_added(udev_device, master);
 664                 }
 665                 else if (!strcmp(action, "remove")) {
 666                         devnode = udev_device_get_devnode(udev_device);
 667                         wl_list_for_each_safe(device, next,
 668                                               &master->devices_list, link)
 669                                 if (!strcmp(device->devnode, devnode)) {
 670                                         device_removed(device);
 671                                         break;
 672                                 }
 673                 }
 674         }
 675         udev_device_unref(udev_device);
 676
 677         return 0;
 678 }
 679
 680 int
 681 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 682 {
 683         struct evdev_seat *master = (struct evdev_seat *) seat_base;
 684         struct wl_event_loop *loop;
 685         struct weston_compositor *c = master->base.compositor;
 686         int fd;
 687
 688         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 689         if (!master->udev_monitor) {
 690                 weston_log("udev: failed to create the udev monitor\n");
 691                 return 0;
 692         }
 693
 694         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 695                         "input", NULL);
 696
 697         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 698                 weston_log("udev: failed to bind the udev monitor\n");
 699                 udev_monitor_unref(master->udev_monitor);
 700                 return 0;
 701         }
 702
 703         loop = wl_display_get_event_loop(c->wl_display);
 704         fd = udev_monitor_get_fd(master->udev_monitor);
 705         master->udev_monitor_source =
 706                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 707                                      evdev_udev_handler, master);
 708         if (!master->udev_monitor_source) {
 709                 udev_monitor_unref(master->udev_monitor);
 710                 return 0;
 711         }
 712
 713         return 1;
 714 }
 715
 716 void
 717 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 718 {
 719         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 720
 721         if (!seat->udev_monitor)
 722                 return;
 723
 724         udev_monitor_unref(seat->udev_monitor);
 725         seat->udev_monitor = NULL;
 726         wl_event_source_remove(seat->udev_monitor_source);
 727         seat->udev_monitor_source = NULL;
 728 }
 729
 730 void
 731 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 732                    const char *seat_id)
 733 {
 734         struct evdev_seat *seat;
 735
 736         seat = malloc(sizeof *seat);
 737         if (seat == NULL)
 738                 return;
 739
 740         memset(seat, 0, sizeof *seat);
 741         weston_seat_init(&seat->base, c);
 742         seat->base.led_update = evdev_led_update;
 743
 744         wl_list_init(&seat->devices_list);
 745         seat->seat_id = strdup(seat_id);
 746         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 747                 free(seat->seat_id);
 748                 free(seat);
 749                 return;
 750         }
 751
 752         evdev_add_devices(udev, &seat->base);
 753
 754         c->seat = &seat->base;
 755 }
 756
 757 void
 758 evdev_remove_devices(struct weston_seat *seat_base)
 759 {
 760         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 761         struct evdev_input_device *device, *next;
 762
 763         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 764                 device_removed(device);
 765
 766         notify_keyboard_focus_out(&seat->base.seat);
 767 }
 768
 769 void
 770 evdev_input_destroy(struct weston_seat *seat_base)
 771 {
 772         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 773
 774         evdev_remove_devices(seat_base);
 775         evdev_disable_udev_monitor(&seat->base);
 776
 777         weston_seat_release(seat_base);
 778         free(seat->seat_id);
 779         free(seat);
 780 }