src/evdev.c

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of the copyright holders not be used in
   9  * advertising or publicity pertaining to distribution of the software
  10  * without specific, written prior permission.  The copyright holders make
  11  * no representations about the suitability of this software for any
  12  * purpose.  It is provided "as is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  15  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  16  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  17  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  18  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  19  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  20  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <linux/input.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29 #include <mtdev.h>
  30
  31 #include "compositor.h"
  32 #include "evdev.h"
  33 #include "launcher-util.h"
  34
  35 struct evdev_input {
  36         struct weston_input_device base;
  37         struct wl_list devices_list;
  38         struct udev_monitor *udev_monitor;
  39         struct wl_event_source *udev_monitor_source;
  40         char *seat_id;
  41 };
  42
  43 #define MAX_SLOTS 16
  44
  45 struct evdev_input_device {
  46         struct evdev_input *master;
  47         struct wl_list link;
  48         struct wl_event_source *source;
  49         struct weston_output *output;
  50         char *devnode;
  51         int fd;
  52         struct {
  53                 int min_x, max_x, min_y, max_y;
  54                 int old_x, old_y, reset_x, reset_y;
  55                 int32_t x, y;
  56         } abs;
  57
  58         struct {
  59                 int slot;
  60                 int32_t x[MAX_SLOTS];
  61                 int32_t y[MAX_SLOTS];
  62         } mt;
  63         struct mtdev *mtdev;
  64
  65         struct {
  66                 int dx, dy;
  67         } rel;
  68
  69         int type; /* event type flags */
  70
  71         int is_touchpad, is_mt;
  72 };
  73
  74 /* event type flags */
  75 #define EVDEV_ABSOLUTE_MOTION           (1 << 0)
  76 #define EVDEV_ABSOLUTE_MT_DOWN          (1 << 1)
  77 #define EVDEV_ABSOLUTE_MT_MOTION        (1 << 2)
  78 #define EVDEV_ABSOLUTE_MT_UP            (1 << 3)
  79 #define EVDEV_RELATIVE_MOTION           (1 << 4)
  80
  81 static inline void
  82 evdev_process_key(struct evdev_input_device *device,
  83                         struct input_event *e, int time)
  84 {
  85         if (e->value == 2)
  86                 return;
  87
  88         switch (e->code) {
  89         case BTN_TOOL_PEN:
  90         case BTN_TOOL_RUBBER:
  91         case BTN_TOOL_BRUSH:
  92         case BTN_TOOL_PENCIL:
  93         case BTN_TOOL_AIRBRUSH:
  94         case BTN_TOOL_FINGER:
  95         case BTN_TOOL_MOUSE:
  96         case BTN_TOOL_LENS:
  97                 if (device->is_touchpad)
  98                 {
  99                         device->abs.reset_x = 1;
 100                         device->abs.reset_y = 1;
 101                 }
 102                 break;
 103         case BTN_TOUCH:
 104                 /* Multitouch touchscreen devices might not send individually
 105                  * button events each time a new finger is down. So we don't
 106                  * send notification for such devices and we solve the button
 107                  * case emulating on compositor side. */
 108                 if (device->is_mt)
 109                         break;
 110
 111                 /* Treat BTN_TOUCH from devices that only have BTN_TOUCH as
 112                  * BTN_LEFT */
 113                 e->code = BTN_LEFT;
 114                 /* Intentional fallthrough! */
 115         case BTN_LEFT:
 116         case BTN_RIGHT:
 117         case BTN_MIDDLE:
 118         case BTN_SIDE:
 119         case BTN_EXTRA:
 120         case BTN_FORWARD:
 121         case BTN_BACK:
 122         case BTN_TASK:
 123                 notify_button(&device->master->base.input_device,
 124                               time, e->code, e->value);
 125                 break;
 126
 127         default:
 128                 notify_key(&device->master->base.input_device,
 129                            time, e->code, e->value);
 130                 break;
 131         }
 132 }
 133
 134 static void
 135 evdev_process_touch(struct evdev_input_device *device,
 136                     struct input_event *e)
 137 {
 138         const int screen_width = device->output->current->width;
 139         const int screen_height = device->output->current->height;
 140
 141         switch (e->code) {
 142         case ABS_MT_SLOT:
 143                 device->mt.slot = e->value;
 144                 break;
 145         case ABS_MT_TRACKING_ID:
 146                 if (e->value >= 0)
 147                         device->type |= EVDEV_ABSOLUTE_MT_DOWN;
 148                 else
 149                         device->type |= EVDEV_ABSOLUTE_MT_UP;
 150                 break;
 151         case ABS_MT_POSITION_X:
 152                 device->mt.x[device->mt.slot] =
 153                         (e->value - device->abs.min_x) * screen_width /
 154                         (device->abs.max_x - device->abs.min_x) +
 155                         device->output->x;
 156                 device->type |= EVDEV_ABSOLUTE_MT_MOTION;
 157                 break;
 158         case ABS_MT_POSITION_Y:
 159                 device->mt.y[device->mt.slot] =
 160                         (e->value - device->abs.min_y) * screen_height /
 161                         (device->abs.max_y - device->abs.min_y) +
 162                         device->output->y;
 163                 device->type |= EVDEV_ABSOLUTE_MT_MOTION;
 164                 break;
 165         }
 166 }
 167
 168 static inline void
 169 evdev_process_absolute_motion(struct evdev_input_device *device,
 170                               struct input_event *e)
 171 {
 172         const int screen_width = device->output->current->width;
 173         const int screen_height = device->output->current->height;
 174
 175         switch (e->code) {
 176         case ABS_X:
 177                 device->abs.x =
 178                         (e->value - device->abs.min_x) * screen_width /
 179                         (device->abs.max_x - device->abs.min_x) +
 180                         device->output->x;
 181                 device->type |= EVDEV_ABSOLUTE_MOTION;
 182                 break;
 183         case ABS_Y:
 184                 device->abs.y =
 185                         (e->value - device->abs.min_y) * screen_height /
 186                         (device->abs.max_y - device->abs.min_y) +
 187                         device->output->y;
 188                 device->type |= EVDEV_ABSOLUTE_MOTION;
 189                 break;
 190         }
 191 }
 192
 193 static inline void
 194 evdev_process_absolute_motion_touchpad(struct evdev_input_device *device,
 195                                        struct input_event *e)
 196 {
 197         /* FIXME: Make this configurable somehow. */
 198         const int touchpad_speed = 700;
 199
 200         switch (e->code) {
 201         case ABS_X:
 202                 e->value -= device->abs.min_x;
 203                 if (device->abs.reset_x)
 204                         device->abs.reset_x = 0;
 205                 else {
 206                         device->rel.dx =
 207                                 (e->value - device->abs.old_x) *
 208                                 touchpad_speed /
 209                                 (device->abs.max_x - device->abs.min_x);
 210                 }
 211                 device->abs.old_x = e->value;
 212                 device->type |= EVDEV_RELATIVE_MOTION;
 213                 break;
 214         case ABS_Y:
 215                 e->value -= device->abs.min_y;
 216                 if (device->abs.reset_y)
 217                         device->abs.reset_y = 0;
 218                 else {
 219                         device->rel.dy =
 220                                 (e->value - device->abs.old_y) *
 221                                 touchpad_speed /
 222                                 /* maybe use x size here to have the same scale? */
 223                                 (device->abs.max_y - device->abs.min_y);
 224                 }
 225                 device->abs.old_y = e->value;
 226                 device->type |= EVDEV_RELATIVE_MOTION;
 227                 break;
 228         }
 229 }
 230
 231 static inline void
 232 evdev_process_relative(struct evdev_input_device *device,
 233                               struct input_event *e, uint32_t time)
 234 {
 235         switch (e->code) {
 236         case REL_X:
 237                 device->rel.dx += e->value;
 238                 device->type |= EVDEV_RELATIVE_MOTION;
 239                 break;
 240         case REL_Y:
 241                 device->rel.dy += e->value;
 242                 device->type |= EVDEV_RELATIVE_MOTION;
 243                 break;
 244         case REL_WHEEL:
 245                 notify_axis(&device->master->base.input_device,
 246                               time,
 247                               WL_INPUT_DEVICE_AXIS_VERTICAL_SCROLL, e->value);
 248                 break;
 249         case REL_HWHEEL:
 250                 notify_axis(&device->master->base.input_device,
 251                               time,
 252                               WL_INPUT_DEVICE_AXIS_HORIZONTAL_SCROLL, e->value);
 253                 break;
 254         }
 255 }
 256
 257 static inline void
 258 evdev_process_absolute(struct evdev_input_device *device,
 259                        struct input_event *e)
 260 {
 261         if (device->is_touchpad) {
 262                 evdev_process_absolute_motion_touchpad(device, e);
 263         } else if (device->is_mt) {
 264                 evdev_process_touch(device, e);
 265         } else {
 266                 evdev_process_absolute_motion(device, e);
 267         }
 268 }
 269
 270 static int
 271 is_motion_event(struct input_event *e)
 272 {
 273         switch (e->type) {
 274         case EV_REL:
 275                 switch (e->code) {
 276                 case REL_X:
 277                 case REL_Y:
 278                         return 1;
 279                 }
 280         case EV_ABS:
 281                 switch (e->code) {
 282                 case ABS_X:
 283                 case ABS_Y:
 284                 case ABS_MT_POSITION_X:
 285                 case ABS_MT_POSITION_Y:
 286                         return 1;
 287                 }
 288         }
 289
 290         return 0;
 291 }
 292
 293 static void
 294 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 295 {
 296         struct wl_input_device *master = &device->master->base.input_device;
 297
 298         if (!device->type)
 299                 return;
 300
 301         if (device->type & EVDEV_RELATIVE_MOTION) {
 302                 notify_motion(master, time,
 303                               master->x + wl_fixed_from_int(device->rel.dx),
 304                               master->y + wl_fixed_from_int(device->rel.dy));
 305                 device->type &= ~EVDEV_RELATIVE_MOTION;
 306                 device->rel.dx = 0;
 307                 device->rel.dy = 0;
 308         }
 309         if (device->type & EVDEV_ABSOLUTE_MT_DOWN) {
 310                 notify_touch(master, time,
 311                              device->mt.slot,
 312                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 313                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 314                              WL_INPUT_DEVICE_TOUCH_DOWN);
 315                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 316                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 317         }
 318         if (device->type & EVDEV_ABSOLUTE_MT_MOTION) {
 319                 notify_touch(master, time,
 320                              device->mt.slot,
 321                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 322                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 323                              WL_INPUT_DEVICE_TOUCH_MOTION);
 324                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 325                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 326         }
 327         if (device->type & EVDEV_ABSOLUTE_MT_UP) {
 328                 notify_touch(master, time, device->mt.slot, 0, 0,
 329                              WL_INPUT_DEVICE_TOUCH_UP);
 330                 device->type &= ~EVDEV_ABSOLUTE_MT_UP;
 331         }
 332         if (device->type & EVDEV_ABSOLUTE_MOTION) {
 333                 notify_motion(master, time,
 334                               wl_fixed_from_int(device->abs.x),
 335                               wl_fixed_from_int(device->abs.y));
 336                 device->type &= ~EVDEV_ABSOLUTE_MOTION;
 337         }
 338 }
 339
 340 static void
 341 evdev_process_events(struct evdev_input_device *device,
 342                      struct input_event *ev, int count)
 343 {
 344         struct input_event *e, *end;
 345         uint32_t time = 0;
 346
 347         device->type = 0;
 348
 349         e = ev;
 350         end = e + count;
 351         for (e = ev; e < end; e++) {
 352                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 353
 354                 /* we try to minimize the amount of notifications to be
 355                  * forwarded to the compositor, so we accumulate motion
 356                  * events and send as a bunch */
 357                 if (!is_motion_event(e))
 358                         evdev_flush_motion(device, time);
 359                 switch (e->type) {
 360                 case EV_REL:
 361                         evdev_process_relative(device, e, time);
 362                         break;
 363                 case EV_ABS:
 364                         evdev_process_absolute(device, e);
 365                         break;
 366                 case EV_KEY:
 367                         evdev_process_key(device, e, time);
 368                         break;
 369                 }
 370         }
 371
 372         evdev_flush_motion(device, time);
 373 }
 374
 375 static int
 376 evdev_input_device_data(int fd, uint32_t mask, void *data)
 377 {
 378         struct weston_compositor *ec;
 379         struct evdev_input_device *device = data;
 380         struct input_event ev[32];
 381         int len;
 382
 383         ec = device->master->base.compositor;
 384         if (!ec->focus)
 385                 return 1;
 386
 387         /* If the compositor is repainting, this function is called only once
 388          * per frame and we have to process all the events available on the
 389          * fd, otherwise there will be input lag. */
 390         do {
 391                 if (device->mtdev)
 392                         len = mtdev_get(device->mtdev, fd, ev,
 393                                         ARRAY_LENGTH(ev)) *
 394                                 sizeof (struct input_event);
 395                 else
 396                         len = read(fd, &ev, sizeof ev);
 397
 398                 if (len < 0 || len % sizeof ev[0] != 0) {
 399                         /* FIXME: call device_removed when errno is ENODEV. */
 400                         return 1;
 401                 }
 402
 403                 evdev_process_events(device, ev, len / sizeof ev[0]);
 404
 405         } while (len > 0);
 406
 407         return 1;
 408 }
 409
 410 /* copied from udev/extras/input_id/input_id.c */
 411 /* we must use this kernel-compatible implementation */
 412 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
 413 #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
 414 #define OFF(x)  ((x)%BITS_PER_LONG)
 415 #define BIT(x)  (1UL<<OFF(x))
 416 #define LONG(x) ((x)/BITS_PER_LONG)
 417 #define TEST_BIT(array, bit)    ((array[LONG(bit)] >> OFF(bit)) & 1)
 418 /* end copied */
 419
 420 static int
 421 evdev_configure_device(struct evdev_input_device *device)
 422 {
 423         struct input_absinfo absinfo;
 424         unsigned long ev_bits[NBITS(EV_MAX)];
 425         unsigned long abs_bits[NBITS(ABS_MAX)];
 426         unsigned long key_bits[NBITS(KEY_MAX)];
 427         int has_key, has_abs;
 428
 429         has_key = 0;
 430         has_abs = 0;
 431
 432         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 433         if (TEST_BIT(ev_bits, EV_ABS)) {
 434                 has_abs = 1;
 435
 436                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 437                       abs_bits);
 438                 if (TEST_BIT(abs_bits, ABS_X)) {
 439                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 440                         device->abs.min_x = absinfo.minimum;
 441                         device->abs.max_x = absinfo.maximum;
 442                 }
 443                 if (TEST_BIT(abs_bits, ABS_Y)) {
 444                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 445                         device->abs.min_y = absinfo.minimum;
 446                         device->abs.max_y = absinfo.maximum;
 447                 }
 448                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 449                         device->is_mt = 1;
 450                         device->mt.slot = 0;
 451                 }
 452         }
 453         if (TEST_BIT(ev_bits, EV_KEY)) {
 454                 has_key = 1;
 455                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 456                       key_bits);
 457                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 458                              !TEST_BIT(key_bits, BTN_TOOL_PEN))
 459                         device->is_touchpad = 1;
 460         }
 461
 462         /* This rule tries to catch accelerometer devices and opt out. We may
 463          * want to adjust the protocol later adding a proper event for dealing
 464          * with accelerometers and implement here accordingly */
 465         if (has_abs && !has_key)
 466                 return -1;
 467
 468         return 0;
 469 }
 470
 471 static struct evdev_input_device *
 472 evdev_input_device_create(struct evdev_input *master,
 473                           struct wl_display *display, const char *path)
 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
 482         ec = master->base.compositor;
 483         device->output =
 484                 container_of(ec->output_list.next, struct weston_output, link);
 485
 486         device->master = master;
 487         device->is_touchpad = 0;
 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
 495         /* Use non-blocking mode so that we can loop on read on
 496          * evdev_input_device_data() until all events on the fd are
 497          * read.  mtdev_get() also expects this. */
 498         device->fd = weston_launcher_open(ec, path, O_RDONLY | O_NONBLOCK);
 499         if (device->fd < 0)
 500                 goto err0;
 501
 502         if (evdev_configure_device(device) == -1)
 503                 goto err1;
 504
 505         if (device->is_mt) {
 506                 device->mtdev = mtdev_new_open(device->fd);
 507                 if (!device->mtdev)
 508                         fprintf(stderr, "mtdev failed to open for %s\n", path);
 509         }
 510
 511         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 512                                               WL_EVENT_READABLE,
 513                                               evdev_input_device_data, device);
 514         if (device->source == NULL)
 515                 goto err1;
 516
 517         wl_list_insert(master->devices_list.prev, &device->link);
 518
 519         return device;
 520
 521 err1:
 522         close(device->fd);
 523 err0:
 524         free(device->devnode);
 525         free(device);
 526         return NULL;
 527 }
 528
 529 static const char default_seat[] = "seat0";
 530
 531 static void
 532 device_added(struct udev_device *udev_device, struct evdev_input *master)
 533 {
 534         struct weston_compositor *c;
 535         const char *devnode;
 536         const char *device_seat;
 537
 538         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 539         if (!device_seat)
 540                 device_seat = default_seat;
 541
 542         if (strcmp(device_seat, master->seat_id))
 543                 return;
 544
 545         c = master->base.compositor;
 546         devnode = udev_device_get_devnode(udev_device);
 547         evdev_input_device_create(master, c->wl_display, devnode);
 548 }
 549
 550 static void
 551 device_removed(struct evdev_input_device *device)
 552 {
 553         wl_event_source_remove(device->source);
 554         wl_list_remove(&device->link);
 555         if (device->mtdev)
 556                 mtdev_close_delete(device->mtdev);
 557         close(device->fd);
 558         free(device->devnode);
 559         free(device);
 560 }
 561
 562 static void
 563 evdev_notify_keyboard_focus(struct evdev_input *input)
 564 {
 565         struct evdev_input_device *device;
 566         struct wl_array keys;
 567         unsigned int i, set;
 568         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 569         uint32_t *k;
 570         int ret;
 571
 572         memset(all_keys, 0, sizeof all_keys);
 573         wl_list_for_each(device, &input->devices_list, link) {
 574                 memset(evdev_keys, 0, sizeof evdev_keys);
 575                 ret = ioctl(device->fd,
 576                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 577                 if (ret < 0) {
 578                         fprintf(stderr, "failed to get keys for device %s\n",
 579                                 device->devnode);
 580                         continue;
 581                 }
 582                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 583                         all_keys[i] |= evdev_keys[i];
 584         }
 585
 586         wl_array_init(&keys);
 587         for (i = 0; i < KEY_CNT; i++) {
 588                 set = all_keys[i >> 3] & (1 << (i & 7));
 589                 if (set) {
 590                         k = wl_array_add(&keys, sizeof *k);
 591                         *k = i;
 592                 }
 593         }
 594
 595         notify_keyboard_focus(&input->base.input_device, &keys);
 596
 597         wl_array_release(&keys);
 598 }
 599
 600 void
 601 evdev_add_devices(struct udev *udev, struct weston_input_device *input_base)
 602 {
 603         struct evdev_input *input = (struct evdev_input *) input_base;
 604         struct udev_enumerate *e;
 605         struct udev_list_entry *entry;
 606         struct udev_device *device;
 607         const char *path, *sysname;
 608
 609         e = udev_enumerate_new(udev);
 610         udev_enumerate_add_match_subsystem(e, "input");
 611         udev_enumerate_scan_devices(e);
 612         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 613                 path = udev_list_entry_get_name(entry);
 614                 device = udev_device_new_from_syspath(udev, path);
 615
 616                 sysname = udev_device_get_sysname(device);
 617                 if (strncmp("event", sysname, 5) != 0) {
 618                         udev_device_unref(device);
 619                         continue;
 620                 }
 621
 622                 device_added(device, input);
 623
 624                 udev_device_unref(device);
 625         }
 626         udev_enumerate_unref(e);
 627
 628         evdev_notify_keyboard_focus(input);
 629
 630         if (wl_list_empty(&input->devices_list)) {
 631                 fprintf(stderr,
 632                         "warning: no input devices on entering Weston. "
 633                         "Possible causes:\n"
 634                         "\t- no permissions to read /dev/input/event*\n"
 635                         "\t- seats misconfigured "
 636                         "(Weston backend option 'seat', "
 637                         "udev device property ID_SEAT)\n");
 638         }
 639 }
 640
 641 static int
 642 evdev_udev_handler(int fd, uint32_t mask, void *data)
 643 {
 644         struct evdev_input *master = data;
 645         struct udev_device *udev_device;
 646         struct evdev_input_device *device, *next;
 647         const char *action;
 648         const char *devnode;
 649
 650         udev_device = udev_monitor_receive_device(master->udev_monitor);
 651         if (!udev_device)
 652                 return 1;
 653
 654         action = udev_device_get_action(udev_device);
 655         if (action) {
 656                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 657                         return 0;
 658
 659                 if (!strcmp(action, "add")) {
 660                         device_added(udev_device, master);
 661                 }
 662                 else if (!strcmp(action, "remove")) {
 663                         devnode = udev_device_get_devnode(udev_device);
 664                         wl_list_for_each_safe(device, next,
 665                                               &master->devices_list, link)
 666                                 if (!strcmp(device->devnode, devnode)) {
 667                                         device_removed(device);
 668                                         break;
 669                                 }
 670                 }
 671         }
 672         udev_device_unref(udev_device);
 673
 674         return 0;
 675 }
 676
 677 int
 678 evdev_enable_udev_monitor(struct udev *udev, struct weston_input_device *input_base)
 679 {
 680         struct evdev_input *master = (struct evdev_input *) input_base;
 681         struct wl_event_loop *loop;
 682         struct weston_compositor *c = master->base.compositor;
 683         int fd;
 684
 685         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 686         if (!master->udev_monitor) {
 687                 fprintf(stderr, "udev: failed to create the udev monitor\n");
 688                 return 0;
 689         }
 690
 691         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 692                         "input", NULL);
 693
 694         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 695                 fprintf(stderr, "udev: failed to bind the udev monitor\n");
 696                 udev_monitor_unref(master->udev_monitor);
 697                 return 0;
 698         }
 699
 700         loop = wl_display_get_event_loop(c->wl_display);
 701         fd = udev_monitor_get_fd(master->udev_monitor);
 702         master->udev_monitor_source =
 703                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 704                                      evdev_udev_handler, master);
 705         if (!master->udev_monitor_source) {
 706                 udev_monitor_unref(master->udev_monitor);
 707                 return 0;
 708         }
 709
 710         return 1;
 711 }
 712
 713 void
 714 evdev_disable_udev_monitor(struct weston_input_device *input_base)
 715 {
 716         struct evdev_input *input = (struct evdev_input *) input_base;
 717
 718         if (!input->udev_monitor)
 719                 return;
 720
 721         udev_monitor_unref(input->udev_monitor);
 722         input->udev_monitor = NULL;
 723         wl_event_source_remove(input->udev_monitor_source);
 724         input->udev_monitor_source = NULL;
 725 }
 726
 727 void
 728 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 729                    const char *seat)
 730 {
 731         struct evdev_input *input;
 732
 733         input = malloc(sizeof *input);
 734         if (input == NULL)
 735                 return;
 736
 737         memset(input, 0, sizeof *input);
 738         weston_input_device_init(&input->base, c);
 739
 740         wl_list_init(&input->devices_list);
 741         input->seat_id = strdup(seat);
 742         if (!evdev_enable_udev_monitor(udev, &input->base)) {
 743                 free(input->seat_id);
 744                 free(input);
 745                 return;
 746         }
 747
 748         evdev_add_devices(udev, &input->base);
 749
 750         c->input_device = &input->base.input_device;
 751 }
 752
 753 void
 754 evdev_remove_devices(struct weston_input_device *input_base)
 755 {
 756         struct evdev_input *input = (struct evdev_input *) input_base;
 757         struct evdev_input_device *device, *next;
 758
 759         wl_list_for_each_safe(device, next, &input->devices_list, link)
 760                 device_removed(device);
 761
 762         notify_keyboard_focus(&input->base.input_device, NULL);
 763 }
 764
 765 void
 766 evdev_input_destroy(struct weston_input_device *input_base)
 767 {
 768         struct evdev_input *input = (struct evdev_input *) input_base;
 769
 770         evdev_remove_devices(input_base);
 771         evdev_disable_udev_monitor(&input->base);
 772
 773         wl_list_remove(&input->base.link);
 774         free(input->seat_id);
 775         free(input);
 776 }