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