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 wl_list *evdev_devices, 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_input_device *device;
  46         struct input_event ev[ARRAY_LENGTH(map)];
  47         unsigned int i;
  48
  49         memset(ev, 0, sizeof(ev));
  50         for (i = 0; i < ARRAY_LENGTH(map); i++) {
  51                 ev[i].type = EV_LED;
  52                 ev[i].code = map[i].evdev;
  53                 ev[i].value = !!(leds & map[i].weston);
  54         }
  55
  56         wl_list_for_each(device, evdev_devices, link) {
  57                 if (device->caps & EVDEV_KEYBOARD)
  58                         write(device->fd, ev, sizeof ev);
  59         }
  60 }
  61
  62 static void
  63 drm_led_update(struct weston_seat *seat_base, enum weston_led leds)
  64 {
  65         struct drm_seat *seat = (struct drm_seat *) seat_base;
  66
  67         evdev_led_update(&seat->devices_list, leds);
  68 }
  69
  70 static inline void
  71 evdev_process_key(struct evdev_input_device *device,
  72                         struct input_event *e, int time)
  73 {
  74         if (e->value == 2)
  75                 return;
  76
  77         switch (e->code) {
  78         case BTN_LEFT:
  79         case BTN_RIGHT:
  80         case BTN_MIDDLE:
  81         case BTN_SIDE:
  82         case BTN_EXTRA:
  83         case BTN_FORWARD:
  84         case BTN_BACK:
  85         case BTN_TASK:
  86                 notify_button(&device->seat->seat,
  87                               time, e->code,
  88                               e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
  89                                          WL_POINTER_BUTTON_STATE_RELEASED);
  90                 break;
  91
  92         default:
  93                 notify_key(&device->seat->seat,
  94                            time, e->code,
  95                            e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
  96                                       WL_KEYBOARD_KEY_STATE_RELEASED,
  97                            STATE_UPDATE_AUTOMATIC);
  98                 break;
  99         }
 100 }
 101
 102 static void
 103 evdev_process_touch(struct evdev_input_device *device,
 104                     struct input_event *e)
 105 {
 106         const int screen_width = device->output->current->width;
 107         const int screen_height = device->output->current->height;
 108
 109         switch (e->code) {
 110         case ABS_MT_SLOT:
 111                 device->mt.slot = e->value;
 112                 break;
 113         case ABS_MT_TRACKING_ID:
 114                 if (e->value >= 0)
 115                         device->pending_events |= EVDEV_ABSOLUTE_MT_DOWN;
 116                 else
 117                         device->pending_events |= EVDEV_ABSOLUTE_MT_UP;
 118                 break;
 119         case ABS_MT_POSITION_X:
 120                 device->mt.x[device->mt.slot] =
 121                         (e->value - device->abs.min_x) * screen_width /
 122                         (device->abs.max_x - device->abs.min_x) +
 123                         device->output->x;
 124                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 125                 break;
 126         case ABS_MT_POSITION_Y:
 127                 device->mt.y[device->mt.slot] =
 128                         (e->value - device->abs.min_y) * screen_height /
 129                         (device->abs.max_y - device->abs.min_y) +
 130                         device->output->y;
 131                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 132                 break;
 133         }
 134 }
 135
 136 static inline void
 137 evdev_process_absolute_motion(struct evdev_input_device *device,
 138                               struct input_event *e)
 139 {
 140         const int screen_width = device->output->current->width;
 141         const int screen_height = device->output->current->height;
 142
 143         switch (e->code) {
 144         case ABS_X:
 145                 device->abs.x =
 146                         (e->value - device->abs.min_x) * screen_width /
 147                         (device->abs.max_x - device->abs.min_x) +
 148                         device->output->x;
 149                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 150                 break;
 151         case ABS_Y:
 152                 device->abs.y =
 153                         (e->value - device->abs.min_y) * screen_height /
 154                         (device->abs.max_y - device->abs.min_y) +
 155                         device->output->y;
 156                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 157                 break;
 158         }
 159 }
 160
 161 static inline void
 162 evdev_process_relative(struct evdev_input_device *device,
 163                        struct input_event *e, uint32_t time)
 164 {
 165         switch (e->code) {
 166         case REL_X:
 167                 device->rel.dx += wl_fixed_from_int(e->value);
 168                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 169                 break;
 170         case REL_Y:
 171                 device->rel.dy += wl_fixed_from_int(e->value);
 172                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 173                 break;
 174         case REL_WHEEL:
 175                 notify_axis(&device->seat->seat,
 176                               time,
 177                               WL_POINTER_AXIS_VERTICAL_SCROLL,
 178                               wl_fixed_from_int(e->value));
 179                 break;
 180         case REL_HWHEEL:
 181                 notify_axis(&device->seat->seat,
 182                               time,
 183                               WL_POINTER_AXIS_HORIZONTAL_SCROLL,
 184                               wl_fixed_from_int(e->value));
 185                 break;
 186         }
 187 }
 188
 189 static inline void
 190 evdev_process_absolute(struct evdev_input_device *device,
 191                        struct input_event *e)
 192 {
 193         if (device->is_mt) {
 194                 evdev_process_touch(device, e);
 195         } else {
 196                 evdev_process_absolute_motion(device, e);
 197         }
 198 }
 199
 200 static int
 201 is_motion_event(struct input_event *e)
 202 {
 203         switch (e->type) {
 204         case EV_REL:
 205                 switch (e->code) {
 206                 case REL_X:
 207                 case REL_Y:
 208                         return 1;
 209                 }
 210         case EV_ABS:
 211                 switch (e->code) {
 212                 case ABS_X:
 213                 case ABS_Y:
 214                 case ABS_MT_POSITION_X:
 215                 case ABS_MT_POSITION_Y:
 216                         return 1;
 217                 }
 218         }
 219
 220         return 0;
 221 }
 222
 223 static void
 224 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 225 {
 226         struct weston_seat *master = device->seat;
 227
 228         if (!device->pending_events)
 229                 return;
 230
 231         if (device->pending_events & EVDEV_RELATIVE_MOTION) {
 232                 notify_motion(&master->seat, time,
 233                               master->seat.pointer->x + device->rel.dx,
 234                               master->seat.pointer->y + device->rel.dy);
 235                 device->pending_events &= ~EVDEV_RELATIVE_MOTION;
 236                 device->rel.dx = 0;
 237                 device->rel.dy = 0;
 238         }
 239         if (device->pending_events & EVDEV_ABSOLUTE_MT_DOWN) {
 240                 notify_touch(&master->seat, time,
 241                              device->mt.slot,
 242                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 243                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 244                              WL_TOUCH_DOWN);
 245                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 246                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 247         }
 248         if (device->pending_events & EVDEV_ABSOLUTE_MT_MOTION) {
 249                 notify_touch(&master->seat, time,
 250                              device->mt.slot,
 251                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 252                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 253                              WL_TOUCH_MOTION);
 254                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 255                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 256         }
 257         if (device->pending_events & EVDEV_ABSOLUTE_MT_UP) {
 258                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 259                              WL_TOUCH_UP);
 260                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_UP;
 261         }
 262         if (device->pending_events & EVDEV_ABSOLUTE_MOTION) {
 263                 notify_motion(&master->seat, time,
 264                               wl_fixed_from_int(device->abs.x),
 265                               wl_fixed_from_int(device->abs.y));
 266                 device->pending_events &= ~EVDEV_ABSOLUTE_MOTION;
 267         }
 268 }
 269
 270 static void
 271 fallback_process(struct evdev_dispatch *dispatch,
 272                  struct evdev_input_device *device,
 273                  struct input_event *event,
 274                  uint32_t time)
 275 {
 276         switch (event->type) {
 277         case EV_REL:
 278                 evdev_process_relative(device, event, time);
 279                 break;
 280         case EV_ABS:
 281                 evdev_process_absolute(device, event);
 282                 break;
 283         case EV_KEY:
 284                 evdev_process_key(device, event, time);
 285                 break;
 286         }
 287 }
 288
 289 static void
 290 fallback_destroy(struct evdev_dispatch *dispatch)
 291 {
 292         free(dispatch);
 293 }
 294
 295 struct evdev_dispatch_interface fallback_interface = {
 296         fallback_process,
 297         fallback_destroy
 298 };
 299
 300 static struct evdev_dispatch *
 301 fallback_dispatch_create(void)
 302 {
 303         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 304         if (dispatch == NULL)
 305                 return NULL;
 306
 307         dispatch->interface = &fallback_interface;
 308
 309         return dispatch;
 310 }
 311
 312 static void
 313 evdev_process_events(struct evdev_input_device *device,
 314                      struct input_event *ev, int count)
 315 {
 316         struct evdev_dispatch *dispatch = device->dispatch;
 317         struct input_event *e, *end;
 318         uint32_t time = 0;
 319
 320         device->pending_events = 0;
 321
 322         e = ev;
 323         end = e + count;
 324         for (e = ev; e < end; e++) {
 325                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 326
 327                 /* we try to minimize the amount of notifications to be
 328                  * forwarded to the compositor, so we accumulate motion
 329                  * events and send as a bunch */
 330                 if (!is_motion_event(e))
 331                         evdev_flush_motion(device, time);
 332
 333                 dispatch->interface->process(dispatch, device, e, time);
 334         }
 335
 336         evdev_flush_motion(device, time);
 337 }
 338
 339 static int
 340 evdev_input_device_data(int fd, uint32_t mask, void *data)
 341 {
 342         struct weston_compositor *ec;
 343         struct evdev_input_device *device = data;
 344         struct input_event ev[32];
 345         int len;
 346
 347         ec = device->seat->compositor;
 348         if (!ec->focus)
 349                 return 1;
 350
 351         /* If the compositor is repainting, this function is called only once
 352          * per frame and we have to process all the events available on the
 353          * fd, otherwise there will be input lag. */
 354         do {
 355                 if (device->mtdev)
 356                         len = mtdev_get(device->mtdev, fd, ev,
 357                                         ARRAY_LENGTH(ev)) *
 358                                 sizeof (struct input_event);
 359                 else
 360                         len = read(fd, &ev, sizeof ev);
 361
 362                 if (len < 0 || len % sizeof ev[0] != 0) {
 363                         /* FIXME: call evdev_input_device_destroy when errno is ENODEV. */
 364                         return 1;
 365                 }
 366
 367                 evdev_process_events(device, ev, len / sizeof ev[0]);
 368
 369         } while (len > 0);
 370
 371         return 1;
 372 }
 373
 374 static int
 375 evdev_configure_device(struct evdev_input_device *device)
 376 {
 377         struct input_absinfo absinfo;
 378         unsigned long ev_bits[NBITS(EV_MAX)];
 379         unsigned long abs_bits[NBITS(ABS_MAX)];
 380         unsigned long rel_bits[NBITS(REL_MAX)];
 381         unsigned long key_bits[NBITS(KEY_MAX)];
 382         int has_key, has_abs;
 383         unsigned int i;
 384
 385         has_key = 0;
 386         has_abs = 0;
 387         device->caps = 0;
 388
 389         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 390         if (TEST_BIT(ev_bits, EV_ABS)) {
 391                 has_abs = 1;
 392
 393                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 394                       abs_bits);
 395                 if (TEST_BIT(abs_bits, ABS_X)) {
 396                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 397                         device->abs.min_x = absinfo.minimum;
 398                         device->abs.max_x = absinfo.maximum;
 399                         device->caps |= EVDEV_MOTION_ABS;
 400                 }
 401                 if (TEST_BIT(abs_bits, ABS_Y)) {
 402                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 403                         device->abs.min_y = absinfo.minimum;
 404                         device->abs.max_y = absinfo.maximum;
 405                         device->caps |= EVDEV_MOTION_ABS;
 406                 }
 407                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 408                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_X),
 409                               &absinfo);
 410                         device->abs.min_x = absinfo.minimum;
 411                         device->abs.max_x = absinfo.maximum;
 412                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_Y),
 413                               &absinfo);
 414                         device->abs.min_y = absinfo.minimum;
 415                         device->abs.max_y = absinfo.maximum;
 416                         device->is_mt = 1;
 417                         device->mt.slot = 0;
 418                         device->caps |= EVDEV_TOUCH;
 419                 }
 420         }
 421         if (TEST_BIT(ev_bits, EV_REL)) {
 422                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 423                       rel_bits);
 424                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 425                         device->caps |= EVDEV_MOTION_REL;
 426         }
 427         if (TEST_BIT(ev_bits, EV_KEY)) {
 428                 has_key = 1;
 429                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 430                       key_bits);
 431                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 432                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 433                     has_abs)
 434                         device->dispatch = evdev_touchpad_create(device);
 435                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 436                         if (i >= BTN_MISC && i < KEY_OK)
 437                                 continue;
 438                         if (TEST_BIT(key_bits, i)) {
 439                                 device->caps |= EVDEV_KEYBOARD;
 440                                 break;
 441                         }
 442                 }
 443                 for (i = BTN_MISC; i < KEY_OK; i++) {
 444                         if (TEST_BIT(key_bits, i)) {
 445                                 device->caps |= EVDEV_BUTTON;
 446                                 break;
 447                         }
 448                 }
 449         }
 450         if (TEST_BIT(ev_bits, EV_LED)) {
 451                 device->caps |= EVDEV_KEYBOARD;
 452         }
 453
 454         /* This rule tries to catch accelerometer devices and opt out. We may
 455          * want to adjust the protocol later adding a proper event for dealing
 456          * with accelerometers and implement here accordingly */
 457         if (has_abs && !has_key && !device->is_mt)
 458                 return -1;
 459
 460         if ((device->caps &
 461              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON)))
 462                 weston_seat_init_pointer(device->seat);
 463         if ((device->caps & EVDEV_KEYBOARD))
 464                 weston_seat_init_keyboard(device->seat, NULL);
 465         if ((device->caps & EVDEV_TOUCH))
 466                 weston_seat_init_touch(device->seat);
 467
 468         return 0;
 469 }
 470
 471 static struct evdev_input_device *
 472 evdev_input_device_create(struct weston_seat *seat,
 473                           const char *path, int device_fd)
 474 {
 475         struct evdev_input_device *device;
 476         struct weston_compositor *ec;
 477
 478         device = malloc(sizeof *device);
 479         if (device == NULL)
 480                 return NULL;
 481         memset(device, 0, sizeof *device);
 482
 483         ec = seat->compositor;
 484         device->output =
 485                 container_of(ec->output_list.next, struct weston_output, link);
 486
 487         device->seat = seat;
 488         device->is_mt = 0;
 489         device->mtdev = NULL;
 490         device->devnode = strdup(path);
 491         device->mt.slot = -1;
 492         device->rel.dx = 0;
 493         device->rel.dy = 0;
 494         device->dispatch = NULL;
 495         device->fd = device_fd;
 496
 497         if (evdev_configure_device(device) == -1)
 498                 goto err1;
 499
 500         /* If the dispatch was not set up use the fallback. */
 501         if (device->dispatch == NULL)
 502                 device->dispatch = fallback_dispatch_create();
 503         if (device->dispatch == NULL)
 504                 goto err1;
 505
 506
 507         if (device->is_mt) {
 508                 device->mtdev = mtdev_new_open(device->fd);
 509                 if (!device->mtdev)
 510                         weston_log("mtdev failed to open for %s\n", path);
 511         }
 512
 513         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 514                                               WL_EVENT_READABLE,
 515                                               evdev_input_device_data, device);
 516         if (device->source == NULL)
 517                 goto err2;
 518
 519         return device;
 520
 521 err2:
 522         device->dispatch->interface->destroy(device->dispatch);
 523 err1:
 524         free(device->devnode);
 525         free(device);
 526         return NULL;
 527 }
 528
 529 static void
 530 evdev_input_device_destroy(struct evdev_input_device *device)
 531 {
 532         struct evdev_dispatch *dispatch;
 533
 534         dispatch = device->dispatch;
 535         if (dispatch)
 536                 dispatch->interface->destroy(dispatch);
 537
 538         wl_event_source_remove(device->source);
 539         wl_list_remove(&device->link);
 540         if (device->mtdev)
 541                 mtdev_close_delete(device->mtdev);
 542         close(device->fd);
 543         free(device->devnode);
 544         free(device);
 545 }
 546
 547 static const char default_seat[] = "seat0";
 548
 549 static void
 550 device_added(struct udev_device *udev_device, struct drm_seat *master)
 551 {
 552         struct weston_compositor *c;
 553         struct evdev_input_device *device;
 554         const char *devnode;
 555         const char *device_seat;
 556         int fd;
 557
 558         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 559         if (!device_seat)
 560                 device_seat = default_seat;
 561
 562         if (strcmp(device_seat, master->seat_id))
 563                 return;
 564
 565         c = master->base.compositor;
 566         devnode = udev_device_get_devnode(udev_device);
 567
 568         /* Use non-blocking mode so that we can loop on read on
 569          * evdev_input_device_data() until all events on the fd are
 570          * read.  mtdev_get() also expects this. */
 571         fd = weston_launcher_open(c, devnode, O_RDWR | O_NONBLOCK);
 572         if (fd < 0) {
 573                 weston_log("opening input device '%s' failed.\n", devnode);
 574                 return;
 575         }
 576
 577         device = evdev_input_device_create(&master->base, devnode, fd);
 578         if (!device) {
 579                 close(fd);
 580                 weston_log("not using input device '%s'.\n", devnode);
 581                 return;
 582         }
 583
 584         wl_list_insert(master->devices_list.prev, &device->link);
 585 }
 586
 587 static void
 588 evdev_notify_keyboard_focus(struct weston_seat *seat,
 589                             struct wl_list *evdev_devices)
 590 {
 591         struct evdev_input_device *device;
 592         struct wl_array keys;
 593         unsigned int i, set;
 594         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 595         uint32_t *k;
 596         int ret;
 597
 598         memset(all_keys, 0, sizeof all_keys);
 599         wl_list_for_each(device, evdev_devices, link) {
 600                 memset(evdev_keys, 0, sizeof evdev_keys);
 601                 ret = ioctl(device->fd,
 602                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 603                 if (ret < 0) {
 604                         weston_log("failed to get keys for device %s\n",
 605                                 device->devnode);
 606                         continue;
 607                 }
 608                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 609                         all_keys[i] |= evdev_keys[i];
 610         }
 611
 612         wl_array_init(&keys);
 613         for (i = 0; i < KEY_CNT; i++) {
 614                 set = all_keys[i >> 3] & (1 << (i & 7));
 615                 if (set) {
 616                         k = wl_array_add(&keys, sizeof *k);
 617                         *k = i;
 618                 }
 619         }
 620
 621         notify_keyboard_focus_in(&seat->seat, &keys, STATE_UPDATE_AUTOMATIC);
 622
 623         wl_array_release(&keys);
 624 }
 625
 626 void
 627 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 628 {
 629         struct drm_seat *seat = (struct drm_seat *) seat_base;
 630         struct udev_enumerate *e;
 631         struct udev_list_entry *entry;
 632         struct udev_device *device;
 633         const char *path, *sysname;
 634
 635         e = udev_enumerate_new(udev);
 636         udev_enumerate_add_match_subsystem(e, "input");
 637         udev_enumerate_scan_devices(e);
 638         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 639                 path = udev_list_entry_get_name(entry);
 640                 device = udev_device_new_from_syspath(udev, path);
 641
 642                 sysname = udev_device_get_sysname(device);
 643                 if (strncmp("event", sysname, 5) != 0) {
 644                         udev_device_unref(device);
 645                         continue;
 646                 }
 647
 648                 device_added(device, seat);
 649
 650                 udev_device_unref(device);
 651         }
 652         udev_enumerate_unref(e);
 653
 654         evdev_notify_keyboard_focus(&seat->base, &seat->devices_list);
 655
 656         if (wl_list_empty(&seat->devices_list)) {
 657                 weston_log(
 658                         "warning: no input devices on entering Weston. "
 659                         "Possible causes:\n"
 660                         "\t- no permissions to read /dev/input/event*\n"
 661                         "\t- seats misconfigured "
 662                         "(Weston backend option 'seat', "
 663                         "udev device property ID_SEAT)\n");
 664         }
 665 }
 666
 667 static int
 668 evdev_udev_handler(int fd, uint32_t mask, void *data)
 669 {
 670         struct drm_seat *master = data;
 671         struct udev_device *udev_device;
 672         struct evdev_input_device *device, *next;
 673         const char *action;
 674         const char *devnode;
 675
 676         udev_device = udev_monitor_receive_device(master->udev_monitor);
 677         if (!udev_device)
 678                 return 1;
 679
 680         action = udev_device_get_action(udev_device);
 681         if (action) {
 682                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 683                         return 0;
 684
 685                 if (!strcmp(action, "add")) {
 686                         device_added(udev_device, master);
 687                 }
 688                 else if (!strcmp(action, "remove")) {
 689                         devnode = udev_device_get_devnode(udev_device);
 690                         wl_list_for_each_safe(device, next,
 691                                               &master->devices_list, link)
 692                                 if (!strcmp(device->devnode, devnode)) {
 693                                         evdev_input_device_destroy(device);
 694                                         break;
 695                                 }
 696                 }
 697         }
 698         udev_device_unref(udev_device);
 699
 700         return 0;
 701 }
 702
 703 int
 704 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 705 {
 706         struct drm_seat *master = (struct drm_seat *) seat_base;
 707         struct wl_event_loop *loop;
 708         struct weston_compositor *c = master->base.compositor;
 709         int fd;
 710
 711         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 712         if (!master->udev_monitor) {
 713                 weston_log("udev: failed to create the udev monitor\n");
 714                 return 0;
 715         }
 716
 717         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 718                         "input", NULL);
 719
 720         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 721                 weston_log("udev: failed to bind the udev monitor\n");
 722                 udev_monitor_unref(master->udev_monitor);
 723                 return 0;
 724         }
 725
 726         loop = wl_display_get_event_loop(c->wl_display);
 727         fd = udev_monitor_get_fd(master->udev_monitor);
 728         master->udev_monitor_source =
 729                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 730                                      evdev_udev_handler, master);
 731         if (!master->udev_monitor_source) {
 732                 udev_monitor_unref(master->udev_monitor);
 733                 return 0;
 734         }
 735
 736         return 1;
 737 }
 738
 739 void
 740 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 741 {
 742         struct drm_seat *seat = (struct drm_seat *) seat_base;
 743
 744         if (!seat->udev_monitor)
 745                 return;
 746
 747         udev_monitor_unref(seat->udev_monitor);
 748         seat->udev_monitor = NULL;
 749         wl_event_source_remove(seat->udev_monitor_source);
 750         seat->udev_monitor_source = NULL;
 751 }
 752
 753 void
 754 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 755                    const char *seat_id)
 756 {
 757         struct drm_seat *seat;
 758
 759         seat = malloc(sizeof *seat);
 760         if (seat == NULL)
 761                 return;
 762
 763         memset(seat, 0, sizeof *seat);
 764         weston_seat_init(&seat->base, c);
 765         seat->base.led_update = drm_led_update;
 766
 767         wl_list_init(&seat->devices_list);
 768         seat->seat_id = strdup(seat_id);
 769         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 770                 free(seat->seat_id);
 771                 free(seat);
 772                 return;
 773         }
 774
 775         evdev_add_devices(udev, &seat->base);
 776
 777         c->seat = &seat->base;
 778 }
 779
 780 void
 781 evdev_remove_devices(struct weston_seat *seat_base)
 782 {
 783         struct drm_seat *seat = (struct drm_seat *) seat_base;
 784         struct evdev_input_device *device, *next;
 785
 786         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 787                 evdev_input_device_destroy(device);
 788
 789         notify_keyboard_focus_out(&seat->base.seat);
 790 }
 791
 792 void
 793 evdev_input_destroy(struct weston_seat *seat_base)
 794 {
 795         struct drm_seat *seat = (struct drm_seat *) seat_base;
 796
 797         evdev_remove_devices(seat_base);
 798         evdev_disable_udev_monitor(&seat->base);
 799
 800         weston_seat_release(seat_base);
 801         free(seat->seat_id);
 802         free(seat);
 803 }