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