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 "launcher-util.h"
  33
  34 static void
  35 evdev_led_update(struct weston_seat *seat_base, enum weston_led leds)
  36 {
  37         static const struct {
  38                 enum weston_led weston;
  39                 int evdev;
  40         } map[] = {
  41                 { LED_NUM_LOCK, LED_NUML },
  42                 { LED_CAPS_LOCK, LED_CAPSL },
  43                 { LED_SCROLL_LOCK, LED_SCROLLL },
  44         };
  45         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
  46         struct evdev_input_device *device;
  47         struct input_event ev[ARRAY_LENGTH(map)];
  48         unsigned int i;
  49
  50         memset(ev, 0, sizeof(ev));
  51         for (i = 0; i < ARRAY_LENGTH(map); i++) {
  52                 ev[i].type = EV_LED;
  53                 ev[i].code = map[i].evdev;
  54                 ev[i].value = !!(leds & map[i].weston);
  55         }
  56
  57         wl_list_for_each(device, &seat->devices_list, link) {
  58                 if (device->caps & EVDEV_KEYBOARD)
  59                         write(device->fd, ev, sizeof ev);
  60         }
  61 }
  62
  63 static inline void
  64 evdev_process_key(struct evdev_input_device *device,
  65                         struct input_event *e, int time)
  66 {
  67         if (e->value == 2)
  68                 return;
  69
  70         switch (e->code) {
  71         case BTN_LEFT:
  72         case BTN_RIGHT:
  73         case BTN_MIDDLE:
  74         case BTN_SIDE:
  75         case BTN_EXTRA:
  76         case BTN_FORWARD:
  77         case BTN_BACK:
  78         case BTN_TASK:
  79                 notify_button(&device->seat->seat,
  80                               time, e->code,
  81                               e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
  82                                          WL_POINTER_BUTTON_STATE_RELEASED);
  83                 break;
  84
  85         default:
  86                 notify_key(&device->seat->seat,
  87                            time, e->code,
  88                            e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
  89                                       WL_KEYBOARD_KEY_STATE_RELEASED,
  90                            STATE_UPDATE_AUTOMATIC);
  91                 break;
  92         }
  93 }
  94
  95 static void
  96 evdev_process_touch(struct evdev_input_device *device,
  97                     struct input_event *e)
  98 {
  99         const int screen_width = device->output->current->width;
 100         const int screen_height = device->output->current->height;
 101
 102         switch (e->code) {
 103         case ABS_MT_SLOT:
 104                 device->mt.slot = e->value;
 105                 break;
 106         case ABS_MT_TRACKING_ID:
 107                 if (e->value >= 0)
 108                         device->pending_events |= EVDEV_ABSOLUTE_MT_DOWN;
 109                 else
 110                         device->pending_events |= EVDEV_ABSOLUTE_MT_UP;
 111                 break;
 112         case ABS_MT_POSITION_X:
 113                 device->mt.x[device->mt.slot] =
 114                         (e->value - device->abs.min_x) * screen_width /
 115                         (device->abs.max_x - device->abs.min_x) +
 116                         device->output->x;
 117                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 118                 break;
 119         case ABS_MT_POSITION_Y:
 120                 device->mt.y[device->mt.slot] =
 121                         (e->value - device->abs.min_y) * screen_height /
 122                         (device->abs.max_y - device->abs.min_y) +
 123                         device->output->y;
 124                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 125                 break;
 126         }
 127 }
 128
 129 static inline void
 130 evdev_process_absolute_motion(struct evdev_input_device *device,
 131                               struct input_event *e)
 132 {
 133         const int screen_width = device->output->current->width;
 134         const int screen_height = device->output->current->height;
 135
 136         switch (e->code) {
 137         case ABS_X:
 138                 device->abs.x =
 139                         (e->value - device->abs.min_x) * screen_width /
 140                         (device->abs.max_x - device->abs.min_x) +
 141                         device->output->x;
 142                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 143                 break;
 144         case ABS_Y:
 145                 device->abs.y =
 146                         (e->value - device->abs.min_y) * screen_height /
 147                         (device->abs.max_y - device->abs.min_y) +
 148                         device->output->y;
 149                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 150                 break;
 151         }
 152 }
 153
 154 static inline void
 155 evdev_process_relative(struct evdev_input_device *device,
 156                        struct input_event *e, uint32_t time)
 157 {
 158         switch (e->code) {
 159         case REL_X:
 160                 device->rel.dx += wl_fixed_from_int(e->value);
 161                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 162                 break;
 163         case REL_Y:
 164                 device->rel.dy += wl_fixed_from_int(e->value);
 165                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 166                 break;
 167         case REL_WHEEL:
 168                 notify_axis(&device->seat->seat,
 169                               time,
 170                               WL_POINTER_AXIS_VERTICAL_SCROLL,
 171                               wl_fixed_from_int(e->value));
 172                 break;
 173         case REL_HWHEEL:
 174                 notify_axis(&device->seat->seat,
 175                               time,
 176                               WL_POINTER_AXIS_HORIZONTAL_SCROLL,
 177                               wl_fixed_from_int(e->value));
 178                 break;
 179         }
 180 }
 181
 182 static inline void
 183 evdev_process_absolute(struct evdev_input_device *device,
 184                        struct input_event *e)
 185 {
 186         if (device->is_mt) {
 187                 evdev_process_touch(device, e);
 188         } else {
 189                 evdev_process_absolute_motion(device, e);
 190         }
 191 }
 192
 193 static int
 194 is_motion_event(struct input_event *e)
 195 {
 196         switch (e->type) {
 197         case EV_REL:
 198                 switch (e->code) {
 199                 case REL_X:
 200                 case REL_Y:
 201                         return 1;
 202                 }
 203         case EV_ABS:
 204                 switch (e->code) {
 205                 case ABS_X:
 206                 case ABS_Y:
 207                 case ABS_MT_POSITION_X:
 208                 case ABS_MT_POSITION_Y:
 209                         return 1;
 210                 }
 211         }
 212
 213         return 0;
 214 }
 215
 216 static void
 217 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 218 {
 219         struct weston_seat *master = device->seat;
 220
 221         if (!device->pending_events)
 222                 return;
 223
 224         if (device->pending_events & EVDEV_RELATIVE_MOTION) {
 225                 notify_motion(&master->seat, time,
 226                               master->seat.pointer->x + device->rel.dx,
 227                               master->seat.pointer->y + device->rel.dy);
 228                 device->pending_events &= ~EVDEV_RELATIVE_MOTION;
 229                 device->rel.dx = 0;
 230                 device->rel.dy = 0;
 231         }
 232         if (device->pending_events & EVDEV_ABSOLUTE_MT_DOWN) {
 233                 notify_touch(&master->seat, time,
 234                              device->mt.slot,
 235                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 236                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 237                              WL_TOUCH_DOWN);
 238                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 239                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 240         }
 241         if (device->pending_events & EVDEV_ABSOLUTE_MT_MOTION) {
 242                 notify_touch(&master->seat, time,
 243                              device->mt.slot,
 244                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 245                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 246                              WL_TOUCH_MOTION);
 247                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 248                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 249         }
 250         if (device->pending_events & EVDEV_ABSOLUTE_MT_UP) {
 251                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 252                              WL_TOUCH_UP);
 253                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_UP;
 254         }
 255         if (device->pending_events & EVDEV_ABSOLUTE_MOTION) {
 256                 notify_motion(&master->seat, time,
 257                               wl_fixed_from_int(device->abs.x),
 258                               wl_fixed_from_int(device->abs.y));
 259                 device->pending_events &= ~EVDEV_ABSOLUTE_MOTION;
 260         }
 261 }
 262
 263 static void
 264 fallback_process(struct evdev_dispatch *dispatch,
 265                  struct evdev_input_device *device,
 266                  struct input_event *event,
 267                  uint32_t time)
 268 {
 269         switch (event->type) {
 270         case EV_REL:
 271                 evdev_process_relative(device, event, time);
 272                 break;
 273         case EV_ABS:
 274                 evdev_process_absolute(device, event);
 275                 break;
 276         case EV_KEY:
 277                 evdev_process_key(device, event, time);
 278                 break;
 279         }
 280 }
 281
 282 static void
 283 fallback_destroy(struct evdev_dispatch *dispatch)
 284 {
 285         free(dispatch);
 286 }
 287
 288 struct evdev_dispatch_interface fallback_interface = {
 289         fallback_process,
 290         fallback_destroy
 291 };
 292
 293 static struct evdev_dispatch *
 294 fallback_dispatch_create(void)
 295 {
 296         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 297         if (dispatch == NULL)
 298                 return NULL;
 299
 300         dispatch->interface = &fallback_interface;
 301
 302         return dispatch;
 303 }
 304
 305 static void
 306 evdev_process_events(struct evdev_input_device *device,
 307                      struct input_event *ev, int count)
 308 {
 309         struct evdev_dispatch *dispatch = device->dispatch;
 310         struct input_event *e, *end;
 311         uint32_t time = 0;
 312
 313         device->pending_events = 0;
 314
 315         e = ev;
 316         end = e + count;
 317         for (e = ev; e < end; e++) {
 318                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 319
 320                 /* we try to minimize the amount of notifications to be
 321                  * forwarded to the compositor, so we accumulate motion
 322                  * events and send as a bunch */
 323                 if (!is_motion_event(e))
 324                         evdev_flush_motion(device, time);
 325
 326                 dispatch->interface->process(dispatch, device, e, time);
 327         }
 328
 329         evdev_flush_motion(device, time);
 330 }
 331
 332 static int
 333 evdev_input_device_data(int fd, uint32_t mask, void *data)
 334 {
 335         struct weston_compositor *ec;
 336         struct evdev_input_device *device = data;
 337         struct input_event ev[32];
 338         int len;
 339
 340         ec = device->seat->compositor;
 341         if (!ec->focus)
 342                 return 1;
 343
 344         /* If the compositor is repainting, this function is called only once
 345          * per frame and we have to process all the events available on the
 346          * fd, otherwise there will be input lag. */
 347         do {
 348                 if (device->mtdev)
 349                         len = mtdev_get(device->mtdev, fd, ev,
 350                                         ARRAY_LENGTH(ev)) *
 351                                 sizeof (struct input_event);
 352                 else
 353                         len = read(fd, &ev, sizeof ev);
 354
 355                 if (len < 0 || len % sizeof ev[0] != 0) {
 356                         /* FIXME: call evdev_input_device_destroy when errno is ENODEV. */
 357                         return 1;
 358                 }
 359
 360                 evdev_process_events(device, ev, len / sizeof ev[0]);
 361
 362         } while (len > 0);
 363
 364         return 1;
 365 }
 366
 367 static int
 368 evdev_configure_device(struct evdev_input_device *device)
 369 {
 370         struct input_absinfo absinfo;
 371         unsigned long ev_bits[NBITS(EV_MAX)];
 372         unsigned long abs_bits[NBITS(ABS_MAX)];
 373         unsigned long rel_bits[NBITS(REL_MAX)];
 374         unsigned long key_bits[NBITS(KEY_MAX)];
 375         int has_key, has_abs;
 376         unsigned int i;
 377
 378         has_key = 0;
 379         has_abs = 0;
 380         device->caps = 0;
 381
 382         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 383         if (TEST_BIT(ev_bits, EV_ABS)) {
 384                 has_abs = 1;
 385
 386                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 387                       abs_bits);
 388                 if (TEST_BIT(abs_bits, ABS_X)) {
 389                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 390                         device->abs.min_x = absinfo.minimum;
 391                         device->abs.max_x = absinfo.maximum;
 392                         device->caps |= EVDEV_MOTION_ABS;
 393                 }
 394                 if (TEST_BIT(abs_bits, ABS_Y)) {
 395                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 396                         device->abs.min_y = absinfo.minimum;
 397                         device->abs.max_y = absinfo.maximum;
 398                         device->caps |= EVDEV_MOTION_ABS;
 399                 }
 400                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 401                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_X),
 402                               &absinfo);
 403                         device->abs.min_x = absinfo.minimum;
 404                         device->abs.max_x = absinfo.maximum;
 405                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_Y),
 406                               &absinfo);
 407                         device->abs.min_y = absinfo.minimum;
 408                         device->abs.max_y = absinfo.maximum;
 409                         device->is_mt = 1;
 410                         device->mt.slot = 0;
 411                         device->caps |= EVDEV_TOUCH;
 412                 }
 413         }
 414         if (TEST_BIT(ev_bits, EV_REL)) {
 415                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 416                       rel_bits);
 417                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 418                         device->caps |= EVDEV_MOTION_REL;
 419         }
 420         if (TEST_BIT(ev_bits, EV_KEY)) {
 421                 has_key = 1;
 422                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 423                       key_bits);
 424                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 425                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 426                     has_abs)
 427                         device->dispatch = evdev_touchpad_create(device);
 428                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 429                         if (i >= BTN_MISC && i < KEY_OK)
 430                                 continue;
 431                         if (TEST_BIT(key_bits, i)) {
 432                                 device->caps |= EVDEV_KEYBOARD;
 433                                 break;
 434                         }
 435                 }
 436                 for (i = BTN_MISC; i < KEY_OK; i++) {
 437                         if (TEST_BIT(key_bits, i)) {
 438                                 device->caps |= EVDEV_BUTTON;
 439                                 break;
 440                         }
 441                 }
 442         }
 443         if (TEST_BIT(ev_bits, EV_LED)) {
 444                 device->caps |= EVDEV_KEYBOARD;
 445         }
 446
 447         /* This rule tries to catch accelerometer devices and opt out. We may
 448          * want to adjust the protocol later adding a proper event for dealing
 449          * with accelerometers and implement here accordingly */
 450         if (has_abs && !has_key && !device->is_mt)
 451                 return -1;
 452
 453         if ((device->caps &
 454              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON)))
 455                 weston_seat_init_pointer(device->seat);
 456         if ((device->caps & EVDEV_KEYBOARD))
 457                 weston_seat_init_keyboard(device->seat, NULL);
 458         if ((device->caps & EVDEV_TOUCH))
 459                 weston_seat_init_touch(device->seat);
 460
 461         return 0;
 462 }
 463
 464 static struct evdev_input_device *
 465 evdev_input_device_create(struct evdev_seat *master,
 466                           const char *path, int device_fd)
 467 {
 468         struct evdev_input_device *device;
 469         struct weston_compositor *ec;
 470
 471         device = malloc(sizeof *device);
 472         if (device == NULL)
 473                 return NULL;
 474
 475         ec = master->base.compositor;
 476         device->output =
 477                 container_of(ec->output_list.next, struct weston_output, link);
 478
 479         device->seat = &master->base;
 480         device->is_mt = 0;
 481         device->mtdev = NULL;
 482         device->devnode = strdup(path);
 483         device->mt.slot = -1;
 484         device->rel.dx = 0;
 485         device->rel.dy = 0;
 486         device->dispatch = NULL;
 487         device->fd = device_fd;
 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         free(device->devnode);
 519         free(device);
 520         return NULL;
 521 }
 522
 523 static void
 524 evdev_input_device_destroy(struct evdev_input_device *device)
 525 {
 526         struct evdev_dispatch *dispatch;
 527
 528         dispatch = device->dispatch;
 529         if (dispatch)
 530                 dispatch->interface->destroy(dispatch);
 531
 532         wl_event_source_remove(device->source);
 533         wl_list_remove(&device->link);
 534         if (device->mtdev)
 535                 mtdev_close_delete(device->mtdev);
 536         close(device->fd);
 537         free(device->devnode);
 538         free(device);
 539 }
 540
 541 static const char default_seat[] = "seat0";
 542
 543 static void
 544 device_added(struct udev_device *udev_device, struct evdev_seat *master)
 545 {
 546         struct weston_compositor *c;
 547         struct evdev_input_device *device;
 548         const char *devnode;
 549         const char *device_seat;
 550         int fd;
 551
 552         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 553         if (!device_seat)
 554                 device_seat = default_seat;
 555
 556         if (strcmp(device_seat, master->seat_id))
 557                 return;
 558
 559         c = master->base.compositor;
 560         devnode = udev_device_get_devnode(udev_device);
 561
 562         /* Use non-blocking mode so that we can loop on read on
 563          * evdev_input_device_data() until all events on the fd are
 564          * read.  mtdev_get() also expects this. */
 565         fd = weston_launcher_open(c, devnode, O_RDWR | O_NONBLOCK);
 566         if (fd < 0) {
 567                 weston_log("opening input device '%s' failed.\n", devnode);
 568                 return;
 569         }
 570
 571         device = evdev_input_device_create(master, devnode, fd);
 572         if (!device) {
 573                 close(fd);
 574                 weston_log("not using input device '%s'.\n", devnode);
 575         }
 576 }
 577
 578 static void
 579 evdev_notify_keyboard_focus(struct evdev_seat *seat)
 580 {
 581         struct evdev_input_device *device;
 582         struct wl_array keys;
 583         unsigned int i, set;
 584         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 585         uint32_t *k;
 586         int ret;
 587
 588         memset(all_keys, 0, sizeof all_keys);
 589         wl_list_for_each(device, &seat->devices_list, link) {
 590                 memset(evdev_keys, 0, sizeof evdev_keys);
 591                 ret = ioctl(device->fd,
 592                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 593                 if (ret < 0) {
 594                         weston_log("failed to get keys for device %s\n",
 595                                 device->devnode);
 596                         continue;
 597                 }
 598                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 599                         all_keys[i] |= evdev_keys[i];
 600         }
 601
 602         wl_array_init(&keys);
 603         for (i = 0; i < KEY_CNT; i++) {
 604                 set = all_keys[i >> 3] & (1 << (i & 7));
 605                 if (set) {
 606                         k = wl_array_add(&keys, sizeof *k);
 607                         *k = i;
 608                 }
 609         }
 610
 611         notify_keyboard_focus_in(&seat->base.seat, &keys,
 612                                  STATE_UPDATE_AUTOMATIC);
 613
 614         wl_array_release(&keys);
 615 }
 616
 617 void
 618 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 619 {
 620         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 621         struct udev_enumerate *e;
 622         struct udev_list_entry *entry;
 623         struct udev_device *device;
 624         const char *path, *sysname;
 625
 626         e = udev_enumerate_new(udev);
 627         udev_enumerate_add_match_subsystem(e, "input");
 628         udev_enumerate_scan_devices(e);
 629         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 630                 path = udev_list_entry_get_name(entry);
 631                 device = udev_device_new_from_syspath(udev, path);
 632
 633                 sysname = udev_device_get_sysname(device);
 634                 if (strncmp("event", sysname, 5) != 0) {
 635                         udev_device_unref(device);
 636                         continue;
 637                 }
 638
 639                 device_added(device, seat);
 640
 641                 udev_device_unref(device);
 642         }
 643         udev_enumerate_unref(e);
 644
 645         evdev_notify_keyboard_focus(seat);
 646
 647         if (wl_list_empty(&seat->devices_list)) {
 648                 weston_log(
 649                         "warning: no input devices on entering Weston. "
 650                         "Possible causes:\n"
 651                         "\t- no permissions to read /dev/input/event*\n"
 652                         "\t- seats misconfigured "
 653                         "(Weston backend option 'seat', "
 654                         "udev device property ID_SEAT)\n");
 655         }
 656 }
 657
 658 static int
 659 evdev_udev_handler(int fd, uint32_t mask, void *data)
 660 {
 661         struct evdev_seat *master = data;
 662         struct udev_device *udev_device;
 663         struct evdev_input_device *device, *next;
 664         const char *action;
 665         const char *devnode;
 666
 667         udev_device = udev_monitor_receive_device(master->udev_monitor);
 668         if (!udev_device)
 669                 return 1;
 670
 671         action = udev_device_get_action(udev_device);
 672         if (action) {
 673                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 674                         return 0;
 675
 676                 if (!strcmp(action, "add")) {
 677                         device_added(udev_device, master);
 678                 }
 679                 else if (!strcmp(action, "remove")) {
 680                         devnode = udev_device_get_devnode(udev_device);
 681                         wl_list_for_each_safe(device, next,
 682                                               &master->devices_list, link)
 683                                 if (!strcmp(device->devnode, devnode)) {
 684                                         evdev_input_device_destroy(device);
 685                                         break;
 686                                 }
 687                 }
 688         }
 689         udev_device_unref(udev_device);
 690
 691         return 0;
 692 }
 693
 694 int
 695 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 696 {
 697         struct evdev_seat *master = (struct evdev_seat *) seat_base;
 698         struct wl_event_loop *loop;
 699         struct weston_compositor *c = master->base.compositor;
 700         int fd;
 701
 702         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 703         if (!master->udev_monitor) {
 704                 weston_log("udev: failed to create the udev monitor\n");
 705                 return 0;
 706         }
 707
 708         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 709                         "input", NULL);
 710
 711         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 712                 weston_log("udev: failed to bind the udev monitor\n");
 713                 udev_monitor_unref(master->udev_monitor);
 714                 return 0;
 715         }
 716
 717         loop = wl_display_get_event_loop(c->wl_display);
 718         fd = udev_monitor_get_fd(master->udev_monitor);
 719         master->udev_monitor_source =
 720                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 721                                      evdev_udev_handler, master);
 722         if (!master->udev_monitor_source) {
 723                 udev_monitor_unref(master->udev_monitor);
 724                 return 0;
 725         }
 726
 727         return 1;
 728 }
 729
 730 void
 731 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 732 {
 733         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 734
 735         if (!seat->udev_monitor)
 736                 return;
 737
 738         udev_monitor_unref(seat->udev_monitor);
 739         seat->udev_monitor = NULL;
 740         wl_event_source_remove(seat->udev_monitor_source);
 741         seat->udev_monitor_source = NULL;
 742 }
 743
 744 void
 745 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 746                    const char *seat_id)
 747 {
 748         struct evdev_seat *seat;
 749
 750         seat = malloc(sizeof *seat);
 751         if (seat == NULL)
 752                 return;
 753
 754         memset(seat, 0, sizeof *seat);
 755         weston_seat_init(&seat->base, c);
 756         seat->base.led_update = evdev_led_update;
 757
 758         wl_list_init(&seat->devices_list);
 759         seat->seat_id = strdup(seat_id);
 760         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 761                 free(seat->seat_id);
 762                 free(seat);
 763                 return;
 764         }
 765
 766         evdev_add_devices(udev, &seat->base);
 767
 768         c->seat = &seat->base;
 769 }
 770
 771 void
 772 evdev_remove_devices(struct weston_seat *seat_base)
 773 {
 774         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 775         struct evdev_input_device *device, *next;
 776
 777         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 778                 evdev_input_device_destroy(device);
 779
 780         notify_keyboard_focus_out(&seat->base.seat);
 781 }
 782
 783 void
 784 evdev_input_destroy(struct weston_seat *seat_base)
 785 {
 786         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 787
 788         evdev_remove_devices(seat_base);
 789         evdev_disable_udev_monitor(&seat->base);
 790
 791         weston_seat_release(seat_base);
 792         free(seat->seat_id);
 793         free(seat);
 794 }