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_seat {
  36         struct weston_seat 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_seat *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                 wl_fixed_t 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.seat,
 124                               time, e->code, e->value);
 125                 break;
 126
 127         default:
 128                 notify_key(&device->master->base.seat,
 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         int dx, dy;
 200
 201         switch (e->code) {
 202         case ABS_X:
 203                 e->value -= device->abs.min_x;
 204                 if (device->abs.reset_x)
 205                         device->abs.reset_x = 0;
 206                 else {
 207                         dx =
 208                                 (e->value - device->abs.old_x) *
 209                                 touchpad_speed /
 210                                 (device->abs.max_x - device->abs.min_x);
 211                         device->rel.dx = wl_fixed_from_int(dx);
 212                 }
 213                 device->abs.old_x = e->value;
 214                 device->type |= EVDEV_RELATIVE_MOTION;
 215                 break;
 216         case ABS_Y:
 217                 e->value -= device->abs.min_y;
 218                 if (device->abs.reset_y)
 219                         device->abs.reset_y = 0;
 220                 else {
 221                         dy =
 222                                 (e->value - device->abs.old_y) *
 223                                 touchpad_speed /
 224                                 /* maybe use x size here to have the same scale? */
 225                                 (device->abs.max_y - device->abs.min_y);
 226                         device->rel.dy = wl_fixed_from_int(dy);
 227                 }
 228                 device->abs.old_y = e->value;
 229                 device->type |= EVDEV_RELATIVE_MOTION;
 230                 break;
 231         }
 232 }
 233
 234 static inline void
 235 evdev_process_relative(struct evdev_input_device *device,
 236                               struct input_event *e, uint32_t time)
 237 {
 238         switch (e->code) {
 239         case REL_X:
 240                 device->rel.dx += wl_fixed_from_int(e->value);
 241                 device->type |= EVDEV_RELATIVE_MOTION;
 242                 break;
 243         case REL_Y:
 244                 device->rel.dy += wl_fixed_from_int(e->value);
 245                 device->type |= EVDEV_RELATIVE_MOTION;
 246                 break;
 247         case REL_WHEEL:
 248                 notify_axis(&device->master->base.seat,
 249                               time,
 250                               WL_POINTER_AXIS_VERTICAL_SCROLL, e->value);
 251                 break;
 252         case REL_HWHEEL:
 253                 notify_axis(&device->master->base.seat,
 254                               time,
 255                               WL_POINTER_AXIS_HORIZONTAL_SCROLL, e->value);
 256                 break;
 257         }
 258 }
 259
 260 static inline void
 261 evdev_process_absolute(struct evdev_input_device *device,
 262                        struct input_event *e)
 263 {
 264         if (device->is_touchpad) {
 265                 evdev_process_absolute_motion_touchpad(device, e);
 266         } else if (device->is_mt) {
 267                 evdev_process_touch(device, e);
 268         } else {
 269                 evdev_process_absolute_motion(device, e);
 270         }
 271 }
 272
 273 static int
 274 is_motion_event(struct input_event *e)
 275 {
 276         switch (e->type) {
 277         case EV_REL:
 278                 switch (e->code) {
 279                 case REL_X:
 280                 case REL_Y:
 281                         return 1;
 282                 }
 283         case EV_ABS:
 284                 switch (e->code) {
 285                 case ABS_X:
 286                 case ABS_Y:
 287                 case ABS_MT_POSITION_X:
 288                 case ABS_MT_POSITION_Y:
 289                         return 1;
 290                 }
 291         }
 292
 293         return 0;
 294 }
 295
 296 static void
 297 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 298 {
 299         struct weston_seat *master = &device->master->base;
 300
 301         if (!device->type)
 302                 return;
 303
 304         if (device->type & EVDEV_RELATIVE_MOTION) {
 305                 notify_motion(&master->seat, time,
 306                               master->seat.pointer->x + device->rel.dx,
 307                               master->seat.pointer->y + device->rel.dy);
 308                 device->type &= ~EVDEV_RELATIVE_MOTION;
 309                 device->rel.dx = 0;
 310                 device->rel.dy = 0;
 311         }
 312         if (device->type & EVDEV_ABSOLUTE_MT_DOWN) {
 313                 notify_touch(&master->seat, time,
 314                              device->mt.slot,
 315                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 316                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 317                              WL_TOUCH_DOWN);
 318                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 319                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 320         }
 321         if (device->type & EVDEV_ABSOLUTE_MT_MOTION) {
 322                 notify_touch(&master->seat, time,
 323                              device->mt.slot,
 324                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 325                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 326                              WL_TOUCH_MOTION);
 327                 device->type &= ~EVDEV_ABSOLUTE_MT_DOWN;
 328                 device->type &= ~EVDEV_ABSOLUTE_MT_MOTION;
 329         }
 330         if (device->type & EVDEV_ABSOLUTE_MT_UP) {
 331                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 332                              WL_TOUCH_UP);
 333                 device->type &= ~EVDEV_ABSOLUTE_MT_UP;
 334         }
 335         if (device->type & EVDEV_ABSOLUTE_MOTION) {
 336                 notify_motion(&master->seat, time,
 337                               wl_fixed_from_int(device->abs.x),
 338                               wl_fixed_from_int(device->abs.y));
 339                 device->type &= ~EVDEV_ABSOLUTE_MOTION;
 340         }
 341 }
 342
 343 static void
 344 evdev_process_events(struct evdev_input_device *device,
 345                      struct input_event *ev, int count)
 346 {
 347         struct input_event *e, *end;
 348         uint32_t time = 0;
 349
 350         device->type = 0;
 351
 352         e = ev;
 353         end = e + count;
 354         for (e = ev; e < end; e++) {
 355                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 356
 357                 /* we try to minimize the amount of notifications to be
 358                  * forwarded to the compositor, so we accumulate motion
 359                  * events and send as a bunch */
 360                 if (!is_motion_event(e))
 361                         evdev_flush_motion(device, time);
 362                 switch (e->type) {
 363                 case EV_REL:
 364                         evdev_process_relative(device, e, time);
 365                         break;
 366                 case EV_ABS:
 367                         evdev_process_absolute(device, e);
 368                         break;
 369                 case EV_KEY:
 370                         evdev_process_key(device, e, time);
 371                         break;
 372                 }
 373         }
 374
 375         evdev_flush_motion(device, time);
 376 }
 377
 378 static int
 379 evdev_input_device_data(int fd, uint32_t mask, void *data)
 380 {
 381         struct weston_compositor *ec;
 382         struct evdev_input_device *device = data;
 383         struct input_event ev[32];
 384         int len;
 385
 386         ec = device->master->base.compositor;
 387         if (!ec->focus)
 388                 return 1;
 389
 390         /* If the compositor is repainting, this function is called only once
 391          * per frame and we have to process all the events available on the
 392          * fd, otherwise there will be input lag. */
 393         do {
 394                 if (device->mtdev)
 395                         len = mtdev_get(device->mtdev, fd, ev,
 396                                         ARRAY_LENGTH(ev)) *
 397                                 sizeof (struct input_event);
 398                 else
 399                         len = read(fd, &ev, sizeof ev);
 400
 401                 if (len < 0 || len % sizeof ev[0] != 0) {
 402                         /* FIXME: call device_removed when errno is ENODEV. */
 403                         return 1;
 404                 }
 405
 406                 evdev_process_events(device, ev, len / sizeof ev[0]);
 407
 408         } while (len > 0);
 409
 410         return 1;
 411 }
 412
 413 /* copied from udev/extras/input_id/input_id.c */
 414 /* we must use this kernel-compatible implementation */
 415 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
 416 #define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
 417 #define OFF(x)  ((x)%BITS_PER_LONG)
 418 #define BIT(x)  (1UL<<OFF(x))
 419 #define LONG(x) ((x)/BITS_PER_LONG)
 420 #define TEST_BIT(array, bit)    ((array[LONG(bit)] >> OFF(bit)) & 1)
 421 /* end copied */
 422
 423 static int
 424 evdev_configure_device(struct evdev_input_device *device)
 425 {
 426         struct input_absinfo absinfo;
 427         unsigned long ev_bits[NBITS(EV_MAX)];
 428         unsigned long abs_bits[NBITS(ABS_MAX)];
 429         unsigned long key_bits[NBITS(KEY_MAX)];
 430         int has_key, has_abs;
 431
 432         has_key = 0;
 433         has_abs = 0;
 434
 435         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 436         if (TEST_BIT(ev_bits, EV_ABS)) {
 437                 has_abs = 1;
 438
 439                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 440                       abs_bits);
 441                 if (TEST_BIT(abs_bits, ABS_X)) {
 442                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 443                         device->abs.min_x = absinfo.minimum;
 444                         device->abs.max_x = absinfo.maximum;
 445                 }
 446                 if (TEST_BIT(abs_bits, ABS_Y)) {
 447                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 448                         device->abs.min_y = absinfo.minimum;
 449                         device->abs.max_y = absinfo.maximum;
 450                 }
 451                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 452                         device->is_mt = 1;
 453                         device->mt.slot = 0;
 454                 }
 455         }
 456         if (TEST_BIT(ev_bits, EV_KEY)) {
 457                 has_key = 1;
 458                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 459                       key_bits);
 460                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 461                              !TEST_BIT(key_bits, BTN_TOOL_PEN))
 462                         device->is_touchpad = 1;
 463         }
 464
 465         /* This rule tries to catch accelerometer devices and opt out. We may
 466          * want to adjust the protocol later adding a proper event for dealing
 467          * with accelerometers and implement here accordingly */
 468         if (has_abs && !has_key)
 469                 return -1;
 470
 471         return 0;
 472 }
 473
 474 static struct evdev_input_device *
 475 evdev_input_device_create(struct evdev_seat *master,
 476                           struct wl_display *display, const char *path)
 477 {
 478         struct evdev_input_device *device;
 479         struct weston_compositor *ec;
 480
 481         device = malloc(sizeof *device);
 482         if (device == NULL)
 483                 return NULL;
 484
 485         ec = master->base.compositor;
 486         device->output =
 487                 container_of(ec->output_list.next, struct weston_output, link);
 488
 489         device->master = master;
 490         device->is_touchpad = 0;
 491         device->is_mt = 0;
 492         device->mtdev = NULL;
 493         device->devnode = strdup(path);
 494         device->mt.slot = -1;
 495         device->rel.dx = 0;
 496         device->rel.dy = 0;
 497
 498         /* Use non-blocking mode so that we can loop on read on
 499          * evdev_input_device_data() until all events on the fd are
 500          * read.  mtdev_get() also expects this. */
 501         device->fd = weston_launcher_open(ec, path, O_RDONLY | O_NONBLOCK);
 502         if (device->fd < 0)
 503                 goto err0;
 504
 505         if (evdev_configure_device(device) == -1)
 506                 goto err1;
 507
 508         if (device->is_mt) {
 509                 device->mtdev = mtdev_new_open(device->fd);
 510                 if (!device->mtdev)
 511                         fprintf(stderr, "mtdev failed to open for %s\n", path);
 512         }
 513
 514         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 515                                               WL_EVENT_READABLE,
 516                                               evdev_input_device_data, device);
 517         if (device->source == NULL)
 518                 goto err1;
 519
 520         wl_list_insert(master->devices_list.prev, &device->link);
 521
 522         return device;
 523
 524 err1:
 525         close(device->fd);
 526 err0:
 527         free(device->devnode);
 528         free(device);
 529         return NULL;
 530 }
 531
 532 static const char default_seat[] = "seat0";
 533
 534 static void
 535 device_added(struct udev_device *udev_device, struct evdev_seat *master)
 536 {
 537         struct weston_compositor *c;
 538         const char *devnode;
 539         const char *device_seat;
 540
 541         device_seat = udev_device_get_property_value(udev_device, "ID_SEAT");
 542         if (!device_seat)
 543                 device_seat = default_seat;
 544
 545         if (strcmp(device_seat, master->seat_id))
 546                 return;
 547
 548         c = master->base.compositor;
 549         devnode = udev_device_get_devnode(udev_device);
 550         evdev_input_device_create(master, c->wl_display, devnode);
 551 }
 552
 553 static void
 554 device_removed(struct evdev_input_device *device)
 555 {
 556         wl_event_source_remove(device->source);
 557         wl_list_remove(&device->link);
 558         if (device->mtdev)
 559                 mtdev_close_delete(device->mtdev);
 560         close(device->fd);
 561         free(device->devnode);
 562         free(device);
 563 }
 564
 565 static void
 566 evdev_notify_keyboard_focus(struct evdev_seat *seat)
 567 {
 568         struct evdev_input_device *device;
 569         struct wl_array keys;
 570         unsigned int i, set;
 571         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 572         uint32_t *k;
 573         int ret;
 574
 575         memset(all_keys, 0, sizeof all_keys);
 576         wl_list_for_each(device, &seat->devices_list, link) {
 577                 memset(evdev_keys, 0, sizeof evdev_keys);
 578                 ret = ioctl(device->fd,
 579                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 580                 if (ret < 0) {
 581                         fprintf(stderr, "failed to get keys for device %s\n",
 582                                 device->devnode);
 583                         continue;
 584                 }
 585                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 586                         all_keys[i] |= evdev_keys[i];
 587         }
 588
 589         wl_array_init(&keys);
 590         for (i = 0; i < KEY_CNT; i++) {
 591                 set = all_keys[i >> 3] & (1 << (i & 7));
 592                 if (set) {
 593                         k = wl_array_add(&keys, sizeof *k);
 594                         *k = i;
 595                 }
 596         }
 597
 598         notify_keyboard_focus(&seat->base.seat, &keys);
 599
 600         wl_array_release(&keys);
 601 }
 602
 603 void
 604 evdev_add_devices(struct udev *udev, struct weston_seat *seat_base)
 605 {
 606         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 607         struct udev_enumerate *e;
 608         struct udev_list_entry *entry;
 609         struct udev_device *device;
 610         const char *path, *sysname;
 611
 612         e = udev_enumerate_new(udev);
 613         udev_enumerate_add_match_subsystem(e, "input");
 614         udev_enumerate_scan_devices(e);
 615         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 616                 path = udev_list_entry_get_name(entry);
 617                 device = udev_device_new_from_syspath(udev, path);
 618
 619                 sysname = udev_device_get_sysname(device);
 620                 if (strncmp("event", sysname, 5) != 0) {
 621                         udev_device_unref(device);
 622                         continue;
 623                 }
 624
 625                 device_added(device, seat);
 626
 627                 udev_device_unref(device);
 628         }
 629         udev_enumerate_unref(e);
 630
 631         evdev_notify_keyboard_focus(seat);
 632
 633         if (wl_list_empty(&seat->devices_list)) {
 634                 fprintf(stderr,
 635                         "warning: no input devices on entering Weston. "
 636                         "Possible causes:\n"
 637                         "\t- no permissions to read /dev/input/event*\n"
 638                         "\t- seats misconfigured "
 639                         "(Weston backend option 'seat', "
 640                         "udev device property ID_SEAT)\n");
 641         }
 642 }
 643
 644 static int
 645 evdev_udev_handler(int fd, uint32_t mask, void *data)
 646 {
 647         struct evdev_seat *master = data;
 648         struct udev_device *udev_device;
 649         struct evdev_input_device *device, *next;
 650         const char *action;
 651         const char *devnode;
 652
 653         udev_device = udev_monitor_receive_device(master->udev_monitor);
 654         if (!udev_device)
 655                 return 1;
 656
 657         action = udev_device_get_action(udev_device);
 658         if (action) {
 659                 if (strncmp("event", udev_device_get_sysname(udev_device), 5) != 0)
 660                         return 0;
 661
 662                 if (!strcmp(action, "add")) {
 663                         device_added(udev_device, master);
 664                 }
 665                 else if (!strcmp(action, "remove")) {
 666                         devnode = udev_device_get_devnode(udev_device);
 667                         wl_list_for_each_safe(device, next,
 668                                               &master->devices_list, link)
 669                                 if (!strcmp(device->devnode, devnode)) {
 670                                         device_removed(device);
 671                                         break;
 672                                 }
 673                 }
 674         }
 675         udev_device_unref(udev_device);
 676
 677         return 0;
 678 }
 679
 680 int
 681 evdev_enable_udev_monitor(struct udev *udev, struct weston_seat *seat_base)
 682 {
 683         struct evdev_seat *master = (struct evdev_seat *) seat_base;
 684         struct wl_event_loop *loop;
 685         struct weston_compositor *c = master->base.compositor;
 686         int fd;
 687
 688         master->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 689         if (!master->udev_monitor) {
 690                 fprintf(stderr, "udev: failed to create the udev monitor\n");
 691                 return 0;
 692         }
 693
 694         udev_monitor_filter_add_match_subsystem_devtype(master->udev_monitor,
 695                         "input", NULL);
 696
 697         if (udev_monitor_enable_receiving(master->udev_monitor)) {
 698                 fprintf(stderr, "udev: failed to bind the udev monitor\n");
 699                 udev_monitor_unref(master->udev_monitor);
 700                 return 0;
 701         }
 702
 703         loop = wl_display_get_event_loop(c->wl_display);
 704         fd = udev_monitor_get_fd(master->udev_monitor);
 705         master->udev_monitor_source =
 706                 wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
 707                                      evdev_udev_handler, master);
 708         if (!master->udev_monitor_source) {
 709                 udev_monitor_unref(master->udev_monitor);
 710                 return 0;
 711         }
 712
 713         return 1;
 714 }
 715
 716 void
 717 evdev_disable_udev_monitor(struct weston_seat *seat_base)
 718 {
 719         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 720
 721         if (!seat->udev_monitor)
 722                 return;
 723
 724         udev_monitor_unref(seat->udev_monitor);
 725         seat->udev_monitor = NULL;
 726         wl_event_source_remove(seat->udev_monitor_source);
 727         seat->udev_monitor_source = NULL;
 728 }
 729
 730 void
 731 evdev_input_create(struct weston_compositor *c, struct udev *udev,
 732                    const char *seat_id)
 733 {
 734         struct evdev_seat *seat;
 735
 736         seat = malloc(sizeof *seat);
 737         if (seat == NULL)
 738                 return;
 739
 740         memset(seat, 0, sizeof *seat);
 741         weston_seat_init(&seat->base, c);
 742
 743         wl_list_init(&seat->devices_list);
 744         seat->seat_id = strdup(seat_id);
 745         if (!evdev_enable_udev_monitor(udev, &seat->base)) {
 746                 free(seat->seat_id);
 747                 free(seat);
 748                 return;
 749         }
 750
 751         evdev_add_devices(udev, &seat->base);
 752
 753         c->seat = &seat->base;
 754 }
 755
 756 void
 757 evdev_remove_devices(struct weston_seat *seat_base)
 758 {
 759         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 760         struct evdev_input_device *device, *next;
 761
 762         wl_list_for_each_safe(device, next, &seat->devices_list, link)
 763                 device_removed(device);
 764
 765         notify_keyboard_focus(&seat->base.seat, NULL);
 766 }
 767
 768 void
 769 evdev_input_destroy(struct weston_seat *seat_base)
 770 {
 771         struct evdev_seat *seat = (struct evdev_seat *) seat_base;
 772
 773         evdev_remove_devices(seat_base);
 774         evdev_disable_udev_monitor(&seat->base);
 775
 776         wl_list_remove(&seat->base.link);
 777         free(seat->seat_id);
 778         free(seat);
 779 }