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
  35 static void
  36 evdev_led_update(struct weston_seat *seat_base, enum weston_led leds)
  37 {
  38         static const struct {
  39                 enum weston_led weston;
  40                 int evdev;
  41         } map[] = {
  42                 { LED_NUM_LOCK, LED_NUML },
  43                 { LED_CAPS_LOCK, LED_CAPSL },
  44                 { LED_SCROLL_LOCK, LED_SCROLLL },
  45         };
  46         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
  47         struct evdev_input_device *device;
  48         struct input_event ev[ARRAY_LENGTH(map)];
  49         unsigned int i;
  50
  51         memset(ev, 0, sizeof(ev));
  52         for (i = 0; i < ARRAY_LENGTH(map); i++) {
  53                 ev[i].type = EV_LED;
  54                 ev[i].code = map[i].evdev;
  55                 ev[i].value = !!(leds & map[i].weston);
  56         }
  57
  58         wl_list_for_each(device, &seat->devices_list, link) {
  59                 if (device->caps & EVDEV_KEYBOARD)
  60                         write(device->fd, ev, sizeof ev);
  61         }
  62 }
  63
  64 static inline void
  65 evdev_process_key(struct evdev_input_device *device,
  66                         struct input_event *e, int time)
  67 {
  68         if (e->value == 2)
  69                 return;
  70
  71         switch (e->code) {
  72         case BTN_LEFT:
  73         case BTN_RIGHT:
  74         case BTN_MIDDLE:
  75         case BTN_SIDE:
  76         case BTN_EXTRA:
  77         case BTN_FORWARD:
  78         case BTN_BACK:
  79         case BTN_TASK:
  80                 notify_button(&device->master->base.seat,
  81                               time, e->code,
  82                               e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
  83                                          WL_POINTER_BUTTON_STATE_RELEASED);
  84                 break;
  85
  86         default:
  87                 notify_key(&device->master->base.seat,
  88                            time, e->code,
  89                            e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
  90                                       WL_KEYBOARD_KEY_STATE_RELEASED,
  91                            STATE_UPDATE_AUTOMATIC);
  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 evdev_input_device_destroy 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                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_X),
 403                               &absinfo);
 404                         device->abs.min_x = absinfo.minimum;
 405                         device->abs.max_x = absinfo.maximum;
 406                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_Y),
 407                               &absinfo);
 408                         device->abs.min_y = absinfo.minimum;
 409                         device->abs.max_y = absinfo.maximum;
 410                         device->is_mt = 1;
 411                         device->mt.slot = 0;
 412                         device->caps |= EVDEV_TOUCH;
 413                 }
 414         }
 415         if (TEST_BIT(ev_bits, EV_REL)) {
 416                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 417                       rel_bits);
 418                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 419                         device->caps |= EVDEV_MOTION_REL;
 420         }
 421         if (TEST_BIT(ev_bits, EV_KEY)) {
 422                 has_key = 1;
 423                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 424                       key_bits);
 425                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 426                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 427                     has_abs)
 428                         device->dispatch = evdev_touchpad_create(device);
 429                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 430                         if (i >= BTN_MISC && i < KEY_OK)
 431                                 continue;
 432                         if (TEST_BIT(key_bits, i)) {
 433                                 device->caps |= EVDEV_KEYBOARD;
 434                                 break;
 435                         }
 436                 }
 437                 for (i = BTN_MISC; i < KEY_OK; i++) {
 438                         if (TEST_BIT(key_bits, i)) {
 439                                 device->caps |= EVDEV_BUTTON;
 440                                 break;
 441                         }
 442                 }
 443         }
 444         if (TEST_BIT(ev_bits, EV_LED)) {
 445                 device->caps |= EVDEV_KEYBOARD;
 446         }
 447
 448         /* This rule tries to catch accelerometer devices and opt out. We may
 449          * want to adjust the protocol later adding a proper event for dealing
 450          * with accelerometers and implement here accordingly */
 451         if (has_abs && !has_key && !device->is_mt)
 452                 return -1;
 453
 454         if ((device->caps &
 455              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON)))
 456                 weston_seat_init_pointer(&device->master->base);
 457         if ((device->caps & EVDEV_KEYBOARD))
 458                 weston_seat_init_keyboard(&device->master->base, NULL);
 459         if ((device->caps & EVDEV_TOUCH))
 460                 weston_seat_init_touch(&device->master->base);
 461
 462         return 0;
 463 }
 464
 465 static struct evdev_input_device *
 466 evdev_input_device_create(struct evdev_seat *master,
 467                           const char *path, int device_fd)
 468 {
 469         struct evdev_input_device *device;
 470         struct weston_compositor *ec;
 471
 472         device = malloc(sizeof *device);
 473         if (device == NULL)
 474                 return NULL;
 475
 476         ec = master->base.compositor;
 477         device->output =
 478                 container_of(ec->output_list.next, struct weston_output, link);
 479
 480         device->master = master;
 481         device->is_mt = 0;
 482         device->mtdev = NULL;
 483         device->devnode = strdup(path);
 484         device->mt.slot = -1;
 485         device->rel.dx = 0;
 486         device->rel.dy = 0;
 487         device->dispatch = NULL;
 488         device->fd = device_fd;
 489
 490         if (evdev_configure_device(device) == -1)
 491                 goto err1;
 492
 493         /* If the dispatch was not set up use the fallback. */
 494         if (device->dispatch == NULL)
 495                 device->dispatch = fallback_dispatch_create();
 496         if (device->dispatch == NULL)
 497                 goto err1;
 498
 499
 500         if (device->is_mt) {
 501                 device->mtdev = mtdev_new_open(device->fd);
 502                 if (!device->mtdev)
 503                         weston_log("mtdev failed to open for %s\n", path);
 504         }
 505
 506         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 507                                               WL_EVENT_READABLE,
 508                                               evdev_input_device_data, device);
 509         if (device->source == NULL)
 510                 goto err2;
 511
 512         wl_list_insert(master->devices_list.prev, &device->link);
 513
 514         return device;
 515
 516 err2:
 517         device->dispatch->interface->destroy(device->dispatch);
 518 err1:
 519         free(device->devnode);
 520         free(device);
 521         return NULL;
 522 }
 523
 524 static void
 525 evdev_input_device_destroy(struct evdev_input_device *device)
 526 {
 527         struct evdev_dispatch *dispatch;
 528
 529         dispatch = device->dispatch;
 530         if (dispatch)
 531                 dispatch->interface->destroy(dispatch);
 532
 533         wl_event_source_remove(device->source);
 534         wl_list_remove(&device->link);
 535         if (device->mtdev)
 536                 mtdev_close_delete(device->mtdev);
 537         close(device->fd);
 538         free(device->devnode);
 539         free(device);
 540 }
 541
 542 static const char default_seat[] = "seat0";
 543
 544 static void
 545 device_added(struct udev_device *udev_device, struct evdev_seat *master)
 546 {
 547         struct weston_compositor *c;
 548         struct evdev_input_device *device;
 549         const char *devnode;
 550         const char *device_seat;
 551         int fd;
 552
 553         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 554         if (!device_seat)
 555                 device_seat = default_seat;
 556
 557         if (strcmp(device_seat, master->seat_id))
 558                 return;
 559
 560         c = master->base.compositor;
 561         devnode = udev_device_get_devnode(udev_device);
 562
 563         /* Use non-blocking mode so that we can loop on read on
 564          * evdev_input_device_data() until all events on the fd are
 565          * read.  mtdev_get() also expects this. */
 566         fd = weston_launcher_open(c, devnode, O_RDWR | O_NONBLOCK);
 567         if (fd < 0) {
 568                 weston_log("opening input device '%s' failed.\n", devnode);
 569                 return;
 570         }
 571
 572         device = evdev_input_device_create(master, devnode, fd);
 573         if (!device) {
 574                 close(fd);
 575                 weston_log("not using input device '%s'.\n", devnode);
 576         }
 577 }
 578
 579 static void
 580 evdev_notify_keyboard_focus(struct evdev_seat *seat)
 581 {
 582         struct evdev_input_device *device;
 583         struct wl_array keys;
 584         unsigned int i, set;
 585         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 586         uint32_t *k;
 587         int ret;
 588
 589         memset(all_keys, 0, sizeof all_keys);
 590         wl_list_for_each(device, &seat->devices_list, link) {
 591                 memset(evdev_keys, 0, sizeof evdev_keys);
 592                 ret = ioctl(device->fd,
 593                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 594                 if (ret < 0) {
 595                         weston_log("failed to get keys for device %s\n",
 596                                 device->devnode);
 597                         continue;
 598                 }
 599                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 600                         all_keys[i] |= evdev_keys[i];
 601         }
 602
 603         wl_array_init(&keys);
 604         for (i = 0; i < KEY_CNT; i++) {
 605                 set = all_keys[i >> 3] & (1 << (i & 7));
 606                 if (set) {
 607                         k = wl_array_add(&keys, sizeof *k);
 608                         *k = i;
 609                 }
 610         }
 611
 612         notify_keyboard_focus_in(&seat->base.seat, &keys,
 613                                  STATE_UPDATE_AUTOMATIC);
 614
 615         wl_array_release(&keys);
 616 }
 617
 618 void
 619 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 620 {
 621         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 622         struct udev_enumerate *e;
 623         struct udev_list_entry *entry;
 624         struct udev_device *device;
 625         const char *path, *sysname;
 626
 627         e = udev_enumerate_new(udev);
 628         udev_enumerate_add_match_subsystem(e, "input");
 629         udev_enumerate_scan_devices(e);
 630         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 631                 path = udev_list_entry_get_name(entry);
 632                 device = udev_device_new_from_syspath(udev, path);
 633
 634                 sysname = udev_device_get_sysname(device);
 635                 if (strncmp("event", sysname, 5) != 0) {
 636                         udev_device_unref(device);
 637                         continue;
 638                 }
 639
 640                 device_added(device, seat);
 641
 642                 udev_device_unref(device);
 643         }
 644         udev_enumerate_unref(e);
 645
 646         evdev_notify_keyboard_focus(seat);
 647
 648         if (wl_list_empty(&seat->devices_list)) {
 649                 weston_log(
 650                         "warning: no input devices on entering Weston. "
 651                         "Possible causes:\n"
 652                         "\t- no permissions to read /dev/input/event*\n"
 653                         "\t- seats misconfigured "
 654                         "(Weston backend option 'seat', "
 655                         "udev device property ID_SEAT)\n");
 656         }
 657 }
 658
 659 static int
 660 evdev_udev_handler(int fd, uint32_t mask, void *data)
 661 {
 662         struct evdev_seat *master = data;
 663         struct udev_device *udev_device;
 664         struct evdev_input_device *device, *next;
 665         const char *action;
 666         const char *devnode;
 667
 668         udev_device = udev_monitor_receive_device(master->udev_monitor);
 669         if (!udev_device)
 670                 return 1;
 671
 672         action = udev_device_get_action(udev_device);
 673         if (action) {
 674                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 675                         return 0;
 676
 677                 if (!strcmp(action, "add")) {
 678                         device_added(udev_device, master);
 679                 }
 680                 else if (!strcmp(action, "remove")) {
 681                         devnode = udev_device_get_devnode(udev_device);
 682                         wl_list_for_each_safe(device, next,
 683                                               &master->devices_list, link)
 684                                 if (!strcmp(device->devnode, devnode)) {
 685                                         evdev_input_device_destroy(device);
 686                                         break;
 687                                 }
 688                 }
 689         }
 690         udev_device_unref(udev_device);
 691
 692         return 0;
 693 }
 694
 695 int
 696 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 697 {
 698         struct evdev_seat *master = (struct evdev_seat *) seat_base;
 699         struct wl_event_loop *loop;
 700         struct weston_compositor *c = master->base.compositor;
 701         int fd;
 702
 703         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 704         if (!master->udev_monitor) {
 705                 weston_log("udev: failed to create the udev monitor\n");
 706                 return 0;
 707         }
 708
 709         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 710                         "input", NULL);
 711
 712         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 713                 weston_log("udev: failed to bind the udev monitor\n");
 714                 udev_monitor_unref(master->udev_monitor);
 715                 return 0;
 716         }
 717
 718         loop = wl_display_get_event_loop(c->wl_display);
 719         fd = udev_monitor_get_fd(master->udev_monitor);
 720         master->udev_monitor_source =
 721                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 722                                      evdev_udev_handler, master);
 723         if (!master->udev_monitor_source) {
 724                 udev_monitor_unref(master->udev_monitor);
 725                 return 0;
 726         }
 727
 728         return 1;
 729 }
 730
 731 void
 732 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 733 {
 734         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 735
 736         if (!seat->udev_monitor)
 737                 return;
 738
 739         udev_monitor_unref(seat->udev_monitor);
 740         seat->udev_monitor = NULL;
 741         wl_event_source_remove(seat->udev_monitor_source);
 742         seat->udev_monitor_source = NULL;
 743 }
 744
 745 void
 746 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 747                    const char *seat_id)
 748 {
 749         struct evdev_seat *seat;
 750
 751         seat = malloc(sizeof *seat);
 752         if (seat == NULL)
 753                 return;
 754
 755         memset(seat, 0, sizeof *seat);
 756         weston_seat_init(&seat->base, c);
 757         seat->base.led_update = evdev_led_update;
 758
 759         wl_list_init(&seat->devices_list);
 760         seat->seat_id = strdup(seat_id);
 761         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 762                 free(seat->seat_id);
 763                 free(seat);
 764                 return;
 765         }
 766
 767         evdev_add_devices(udev, &seat->base);
 768
 769         c->seat = &seat->base;
 770 }
 771
 772 void
 773 evdev_remove_devices(struct weston_seat *seat_base)
 774 {
 775         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 776         struct evdev_input_device *device, *next;
 777
 778         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 779                 evdev_input_device_destroy(device);
 780
 781         notify_keyboard_focus_out(&seat->base.seat);
 782 }
 783
 784 void
 785 evdev_input_destroy(struct weston_seat *seat_base)
 786 {
 787         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 788
 789         evdev_remove_devices(seat_base);
 790         evdev_disable_udev_monitor(&seat->base);
 791
 792         weston_seat_release(seat_base);
 793         free(seat->seat_id);
 794         free(seat);
 795 }