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
  33 void
  34 evdev_led_update(struct wl_list *evdev_devices, enum weston_led leds)
  35 {
  36         static const struct {
  37                 enum weston_led weston;
  38                 int evdev;
  39         } map[] = {
  40                 { LED_NUM_LOCK, LED_NUML },
  41                 { LED_CAPS_LOCK, LED_CAPSL },
  42                 { LED_SCROLL_LOCK, LED_SCROLLL },
  43         };
  44         struct evdev_input_device *device;
  45         struct input_event ev[ARRAY_LENGTH(map)];
  46         unsigned int i;
  47
  48         memset(ev, 0, sizeof(ev));
  49         for (i = 0; i < ARRAY_LENGTH(map); i++) {
  50                 ev[i].type = EV_LED;
  51                 ev[i].code = map[i].evdev;
  52                 ev[i].value = !!(leds & map[i].weston);
  53         }
  54
  55         wl_list_for_each(device, evdev_devices, link) {
  56                 if (device->caps & EVDEV_KEYBOARD)
  57                         write(device->fd, ev, sizeof ev);
  58         }
  59 }
  60
  61 static inline void
  62 evdev_process_key(struct evdev_input_device *device,
  63                         struct input_event *e, int time)
  64 {
  65         if (e->value == 2)
  66                 return;
  67
  68         switch (e->code) {
  69         case BTN_LEFT:
  70         case BTN_RIGHT:
  71         case BTN_MIDDLE:
  72         case BTN_SIDE:
  73         case BTN_EXTRA:
  74         case BTN_FORWARD:
  75         case BTN_BACK:
  76         case BTN_TASK:
  77                 notify_button(&device->seat->seat,
  78                               time, e->code,
  79                               e->value ? WL_POINTER_BUTTON_STATE_PRESSED :
  80                                          WL_POINTER_BUTTON_STATE_RELEASED);
  81                 break;
  82
  83         default:
  84                 notify_key(&device->seat->seat,
  85                            time, e->code,
  86                            e->value ? WL_KEYBOARD_KEY_STATE_PRESSED :
  87                                       WL_KEYBOARD_KEY_STATE_RELEASED,
  88                            STATE_UPDATE_AUTOMATIC);
  89                 break;
  90         }
  91 }
  92
  93 static void
  94 evdev_process_touch(struct evdev_input_device *device,
  95                     struct input_event *e)
  96 {
  97         const int screen_width = device->output->current->width;
  98         const int screen_height = device->output->current->height;
  99
 100         switch (e->code) {
 101         case ABS_MT_SLOT:
 102                 device->mt.slot = e->value;
 103                 break;
 104         case ABS_MT_TRACKING_ID:
 105                 if (e->value >= 0)
 106                         device->pending_events |= EVDEV_ABSOLUTE_MT_DOWN;
 107                 else
 108                         device->pending_events |= EVDEV_ABSOLUTE_MT_UP;
 109                 break;
 110         case ABS_MT_POSITION_X:
 111                 device->mt.x[device->mt.slot] =
 112                         (e->value - device->abs.min_x) * screen_width /
 113                         (device->abs.max_x - device->abs.min_x) +
 114                         device->output->x;
 115                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 116                 break;
 117         case ABS_MT_POSITION_Y:
 118                 device->mt.y[device->mt.slot] =
 119                         (e->value - device->abs.min_y) * screen_height /
 120                         (device->abs.max_y - device->abs.min_y) +
 121                         device->output->y;
 122                 device->pending_events |= EVDEV_ABSOLUTE_MT_MOTION;
 123                 break;
 124         }
 125 }
 126
 127 static inline void
 128 evdev_process_absolute_motion(struct evdev_input_device *device,
 129                               struct input_event *e)
 130 {
 131         const int screen_width = device->output->current->width;
 132         const int screen_height = device->output->current->height;
 133
 134         switch (e->code) {
 135         case ABS_X:
 136                 device->abs.x =
 137                         (e->value - device->abs.min_x) * screen_width /
 138                         (device->abs.max_x - device->abs.min_x) +
 139                         device->output->x;
 140                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 141                 break;
 142         case ABS_Y:
 143                 device->abs.y =
 144                         (e->value - device->abs.min_y) * screen_height /
 145                         (device->abs.max_y - device->abs.min_y) +
 146                         device->output->y;
 147                 device->pending_events |= EVDEV_ABSOLUTE_MOTION;
 148                 break;
 149         }
 150 }
 151
 152 static inline void
 153 evdev_process_relative(struct evdev_input_device *device,
 154                        struct input_event *e, uint32_t time)
 155 {
 156         switch (e->code) {
 157         case REL_X:
 158                 device->rel.dx += wl_fixed_from_int(e->value);
 159                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 160                 break;
 161         case REL_Y:
 162                 device->rel.dy += wl_fixed_from_int(e->value);
 163                 device->pending_events |= EVDEV_RELATIVE_MOTION;
 164                 break;
 165         case REL_WHEEL:
 166                 notify_axis(&device->seat->seat,
 167                               time,
 168                               WL_POINTER_AXIS_VERTICAL_SCROLL,
 169                               wl_fixed_from_int(e->value));
 170                 break;
 171         case REL_HWHEEL:
 172                 notify_axis(&device->seat->seat,
 173                               time,
 174                               WL_POINTER_AXIS_HORIZONTAL_SCROLL,
 175                               wl_fixed_from_int(e->value));
 176                 break;
 177         }
 178 }
 179
 180 static inline void
 181 evdev_process_absolute(struct evdev_input_device *device,
 182                        struct input_event *e)
 183 {
 184         if (device->is_mt) {
 185                 evdev_process_touch(device, e);
 186         } else {
 187                 evdev_process_absolute_motion(device, e);
 188         }
 189 }
 190
 191 static int
 192 is_motion_event(struct input_event *e)
 193 {
 194         switch (e->type) {
 195         case EV_REL:
 196                 switch (e->code) {
 197                 case REL_X:
 198                 case REL_Y:
 199                         return 1;
 200                 }
 201         case EV_ABS:
 202                 switch (e->code) {
 203                 case ABS_X:
 204                 case ABS_Y:
 205                 case ABS_MT_POSITION_X:
 206                 case ABS_MT_POSITION_Y:
 207                         return 1;
 208                 }
 209         }
 210
 211         return 0;
 212 }
 213
 214 static void
 215 evdev_flush_motion(struct evdev_input_device *device, uint32_t time)
 216 {
 217         struct weston_seat *master = device->seat;
 218
 219         if (!device->pending_events)
 220                 return;
 221
 222         if (device->pending_events & EVDEV_RELATIVE_MOTION) {
 223                 notify_motion(&master->seat, time,
 224                               master->seat.pointer->x + device->rel.dx,
 225                               master->seat.pointer->y + device->rel.dy);
 226                 device->pending_events &= ~EVDEV_RELATIVE_MOTION;
 227                 device->rel.dx = 0;
 228                 device->rel.dy = 0;
 229         }
 230         if (device->pending_events & EVDEV_ABSOLUTE_MT_DOWN) {
 231                 notify_touch(&master->seat, time,
 232                              device->mt.slot,
 233                              wl_fixed_from_int(device->mt.x[device->mt.slot]),
 234                              wl_fixed_from_int(device->mt.y[device->mt.slot]),
 235                              WL_TOUCH_DOWN);
 236                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_DOWN;
 237                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_MOTION;
 238         }
 239         if (device->pending_events & EVDEV_ABSOLUTE_MT_MOTION) {
 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_MOTION);
 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_UP) {
 249                 notify_touch(&master->seat, time, device->mt.slot, 0, 0,
 250                              WL_TOUCH_UP);
 251                 device->pending_events &= ~EVDEV_ABSOLUTE_MT_UP;
 252         }
 253         if (device->pending_events & EVDEV_ABSOLUTE_MOTION) {
 254                 notify_motion(&master->seat, time,
 255                               wl_fixed_from_int(device->abs.x),
 256                               wl_fixed_from_int(device->abs.y));
 257                 device->pending_events &= ~EVDEV_ABSOLUTE_MOTION;
 258         }
 259 }
 260
 261 static void
 262 fallback_process(struct evdev_dispatch *dispatch,
 263                  struct evdev_input_device *device,
 264                  struct input_event *event,
 265                  uint32_t time)
 266 {
 267         switch (event->type) {
 268         case EV_REL:
 269                 evdev_process_relative(device, event, time);
 270                 break;
 271         case EV_ABS:
 272                 evdev_process_absolute(device, event);
 273                 break;
 274         case EV_KEY:
 275                 evdev_process_key(device, event, time);
 276                 break;
 277         }
 278 }
 279
 280 static void
 281 fallback_destroy(struct evdev_dispatch *dispatch)
 282 {
 283         free(dispatch);
 284 }
 285
 286 struct evdev_dispatch_interface fallback_interface = {
 287         fallback_process,
 288         fallback_destroy
 289 };
 290
 291 static struct evdev_dispatch *
 292 fallback_dispatch_create(void)
 293 {
 294         struct evdev_dispatch *dispatch = malloc(sizeof *dispatch);
 295         if (dispatch == NULL)
 296                 return NULL;
 297
 298         dispatch->interface = &fallback_interface;
 299
 300         return dispatch;
 301 }
 302
 303 static void
 304 evdev_process_events(struct evdev_input_device *device,
 305                      struct input_event *ev, int count)
 306 {
 307         struct evdev_dispatch *dispatch = device->dispatch;
 308         struct input_event *e, *end;
 309         uint32_t time = 0;
 310
 311         device->pending_events = 0;
 312
 313         e = ev;
 314         end = e + count;
 315         for (e = ev; e < end; e++) {
 316                 time = e->time.tv_sec * 1000 + e->time.tv_usec / 1000;
 317
 318                 /* we try to minimize the amount of notifications to be
 319                  * forwarded to the compositor, so we accumulate motion
 320                  * events and send as a bunch */
 321                 if (!is_motion_event(e))
 322                         evdev_flush_motion(device, time);
 323
 324                 dispatch->interface->process(dispatch, device, e, time);
 325         }
 326
 327         evdev_flush_motion(device, time);
 328 }
 329
 330 static int
 331 evdev_input_device_data(int fd, uint32_t mask, void *data)
 332 {
 333         struct weston_compositor *ec;
 334         struct evdev_input_device *device = data;
 335         struct input_event ev[32];
 336         int len;
 337
 338         ec = device->seat->compositor;
 339         if (!ec->focus)
 340                 return 1;
 341
 342         /* If the compositor is repainting, this function is called only once
 343          * per frame and we have to process all the events available on the
 344          * fd, otherwise there will be input lag. */
 345         do {
 346                 if (device->mtdev)
 347                         len = mtdev_get(device->mtdev, fd, ev,
 348                                         ARRAY_LENGTH(ev)) *
 349                                 sizeof (struct input_event);
 350                 else
 351                         len = read(fd, &ev, sizeof ev);
 352
 353                 if (len < 0 || len % sizeof ev[0] != 0) {
 354                         /* FIXME: call evdev_input_device_destroy when errno is ENODEV. */
 355                         return 1;
 356                 }
 357
 358                 evdev_process_events(device, ev, len / sizeof ev[0]);
 359
 360         } while (len > 0);
 361
 362         return 1;
 363 }
 364
 365 static int
 366 evdev_configure_device(struct evdev_input_device *device)
 367 {
 368         struct input_absinfo absinfo;
 369         unsigned long ev_bits[NBITS(EV_MAX)];
 370         unsigned long abs_bits[NBITS(ABS_MAX)];
 371         unsigned long rel_bits[NBITS(REL_MAX)];
 372         unsigned long key_bits[NBITS(KEY_MAX)];
 373         int has_key, has_abs;
 374         unsigned int i;
 375
 376         has_key = 0;
 377         has_abs = 0;
 378         device->caps = 0;
 379
 380         ioctl(device->fd, EVIOCGBIT(0, sizeof(ev_bits)), ev_bits);
 381         if (TEST_BIT(ev_bits, EV_ABS)) {
 382                 has_abs = 1;
 383
 384                 ioctl(device->fd, EVIOCGBIT(EV_ABS, sizeof(abs_bits)),
 385                       abs_bits);
 386                 if (TEST_BIT(abs_bits, ABS_X)) {
 387                         ioctl(device->fd, EVIOCGABS(ABS_X), &absinfo);
 388                         device->abs.min_x = absinfo.minimum;
 389                         device->abs.max_x = absinfo.maximum;
 390                         device->caps |= EVDEV_MOTION_ABS;
 391                 }
 392                 if (TEST_BIT(abs_bits, ABS_Y)) {
 393                         ioctl(device->fd, EVIOCGABS(ABS_Y), &absinfo);
 394                         device->abs.min_y = absinfo.minimum;
 395                         device->abs.max_y = absinfo.maximum;
 396                         device->caps |= EVDEV_MOTION_ABS;
 397                 }
 398                 if (TEST_BIT(abs_bits, ABS_MT_SLOT)) {
 399                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_X),
 400                               &absinfo);
 401                         device->abs.min_x = absinfo.minimum;
 402                         device->abs.max_x = absinfo.maximum;
 403                         ioctl(device->fd, EVIOCGABS(ABS_MT_POSITION_Y),
 404                               &absinfo);
 405                         device->abs.min_y = absinfo.minimum;
 406                         device->abs.max_y = absinfo.maximum;
 407                         device->is_mt = 1;
 408                         device->mt.slot = 0;
 409                         device->caps |= EVDEV_TOUCH;
 410                 }
 411         }
 412         if (TEST_BIT(ev_bits, EV_REL)) {
 413                 ioctl(device->fd, EVIOCGBIT(EV_REL, sizeof(rel_bits)),
 414                       rel_bits);
 415                 if (TEST_BIT(rel_bits, REL_X) || TEST_BIT(rel_bits, REL_Y))
 416                         device->caps |= EVDEV_MOTION_REL;
 417         }
 418         if (TEST_BIT(ev_bits, EV_KEY)) {
 419                 has_key = 1;
 420                 ioctl(device->fd, EVIOCGBIT(EV_KEY, sizeof(key_bits)),
 421                       key_bits);
 422                 if (TEST_BIT(key_bits, BTN_TOOL_FINGER) &&
 423                     !TEST_BIT(key_bits, BTN_TOOL_PEN) &&
 424                     has_abs)
 425                         device->dispatch = evdev_touchpad_create(device);
 426                 for (i = KEY_ESC; i < KEY_MAX; i++) {
 427                         if (i >= BTN_MISC && i < KEY_OK)
 428                                 continue;
 429                         if (TEST_BIT(key_bits, i)) {
 430                                 device->caps |= EVDEV_KEYBOARD;
 431                                 break;
 432                         }
 433                 }
 434                 for (i = BTN_MISC; i < KEY_OK; i++) {
 435                         if (TEST_BIT(key_bits, i)) {
 436                                 device->caps |= EVDEV_BUTTON;
 437                                 break;
 438                         }
 439                 }
 440         }
 441         if (TEST_BIT(ev_bits, EV_LED)) {
 442                 device->caps |= EVDEV_KEYBOARD;
 443         }
 444
 445         /* This rule tries to catch accelerometer devices and opt out. We may
 446          * want to adjust the protocol later adding a proper event for dealing
 447          * with accelerometers and implement here accordingly */
 448         if (has_abs && !has_key && !device->is_mt)
 449                 return -1;
 450
 451         if ((device->caps &
 452              (EVDEV_MOTION_ABS | EVDEV_MOTION_REL | EVDEV_BUTTON)))
 453                 weston_seat_init_pointer(device->seat);
 454         if ((device->caps & EVDEV_KEYBOARD))
 455                 weston_seat_init_keyboard(device->seat, NULL);
 456         if ((device->caps & EVDEV_TOUCH))
 457                 weston_seat_init_touch(device->seat);
 458
 459         return 0;
 460 }
 461
 462 struct evdev_input_device *
 463 evdev_input_device_create(struct weston_seat *seat,
 464                           const char *path, int device_fd)
 465 {
 466         struct evdev_input_device *device;
 467         struct weston_compositor *ec;
 468
 469         device = malloc(sizeof *device);
 470         if (device == NULL)
 471                 return NULL;
 472         memset(device, 0, sizeof *device);
 473
 474         ec = seat->compositor;
 475         device->output =
 476                 container_of(ec->output_list.next, struct weston_output, link);
 477
 478         device->seat = seat;
 479         device->is_mt = 0;
 480         device->mtdev = NULL;
 481         device->devnode = strdup(path);
 482         device->mt.slot = -1;
 483         device->rel.dx = 0;
 484         device->rel.dy = 0;
 485         device->dispatch = NULL;
 486         device->fd = device_fd;
 487
 488         if (evdev_configure_device(device) == -1)
 489                 goto err1;
 490
 491         /* If the dispatch was not set up use the fallback. */
 492         if (device->dispatch == NULL)
 493                 device->dispatch = fallback_dispatch_create();
 494         if (device->dispatch == NULL)
 495                 goto err1;
 496
 497
 498         if (device->is_mt) {
 499                 device->mtdev = mtdev_new_open(device->fd);
 500                 if (!device->mtdev)
 501                         weston_log("mtdev failed to open for %s\n", path);
 502         }
 503
 504         device->source = wl_event_loop_add_fd(ec->input_loop, device->fd,
 505                                               WL_EVENT_READABLE,
 506                                               evdev_input_device_data, device);
 507         if (device->source == NULL)
 508                 goto err2;
 509
 510         return device;
 511
 512 err2:
 513         device->dispatch->interface->destroy(device->dispatch);
 514 err1:
 515         free(device->devnode);
 516         free(device);
 517         return NULL;
 518 }
 519
 520 void
 521 evdev_input_device_destroy(struct evdev_input_device *device)
 522 {
 523         struct evdev_dispatch *dispatch;
 524
 525         dispatch = device->dispatch;
 526         if (dispatch)
 527                 dispatch->interface->destroy(dispatch);
 528
 529         wl_event_source_remove(device->source);
 530         wl_list_remove(&device->link);
 531         if (device->mtdev)
 532                 mtdev_close_delete(device->mtdev);
 533         close(device->fd);
 534         free(device->devnode);
 535         free(device);
 536 }
 537
 538 void
 539 evdev_notify_keyboard_focus(struct weston_seat *seat,
 540                             struct wl_list *evdev_devices)
 541 {
 542         struct evdev_input_device *device;
 543         struct wl_array keys;
 544         unsigned int i, set;
 545         char evdev_keys[(KEY_CNT + 7) / 8], all_keys[(KEY_CNT + 7) / 8];
 546         uint32_t *k;
 547         int ret;
 548
 549         memset(all_keys, 0, sizeof all_keys);
 550         wl_list_for_each(device, evdev_devices, link) {
 551                 memset(evdev_keys, 0, sizeof evdev_keys);
 552                 ret = ioctl(device->fd,
 553                             EVIOCGKEY(sizeof evdev_keys), evdev_keys);
 554                 if (ret < 0) {
 555                         weston_log("failed to get keys for device %s\n",
 556                                 device->devnode);
 557                         continue;
 558                 }
 559                 for (i = 0; i < ARRAY_LENGTH(evdev_keys); i++)
 560                         all_keys[i] |= evdev_keys[i];
 561         }
 562
 563         wl_array_init(&keys);
 564         for (i = 0; i < KEY_CNT; i++) {
 565                 set = all_keys[i >> 3] & (1 << (i & 7));
 566                 if (set) {
 567                         k = wl_array_add(&keys, sizeof *k);
 568                         *k = i;
 569                 }
 570         }
 571
 572         notify_keyboard_focus_in(&seat->seat, &keys, STATE_UPDATE_AUTOMATIC);
 573
 574         wl_array_release(&keys);
 575 }