Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/evdev/evdev.c
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1 /*- 2 * Copyright (c) 2014 Jakub Wojciech Klama <jceel@FreeBSD.org> 3 * Copyright (c) 2015-2016 Vladimir Kondratyev <wulf@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include "opt_evdev.h" 31 32 #include <sys/param.h> 33 #include <sys/bitstring.h> 34 #include <sys/ck.h> 35 #include <sys/conf.h> 36 #include <sys/epoch.h> 37 #include <sys/kdb.h> 38 #include <sys/kernel.h> 39 #include <sys/malloc.h> 40 #include <sys/module.h> 41 #include <sys/proc.h> 42 #include <sys/sx.h> 43 #include <sys/sysctl.h> 44 #include <sys/systm.h> 45 46 #include <dev/evdev/evdev.h> 47 #include <dev/evdev/evdev_private.h> 48 #include <dev/evdev/input.h> 49 50 #ifdef EVDEV_DEBUG 51 #define debugf(evdev, fmt, args...) printf("evdev: " fmt "\n", ##args) 52 #else 53 #define debugf(evdev, fmt, args...) 54 #endif 55 56 #ifdef FEATURE 57 FEATURE(evdev, "Input event devices support"); 58 #ifdef EVDEV_SUPPORT 59 FEATURE(evdev_support, "Evdev support in hybrid drivers"); 60 #endif 61 #endif 62 63 enum evdev_sparse_result 64 { 65 EV_SKIP_EVENT, /* Event value not changed */ 66 EV_REPORT_EVENT, /* Event value changed */ 67 EV_REPORT_MT_SLOT, /* Event value and MT slot number changed */ 68 }; 69 70 MALLOC_DEFINE(M_EVDEV, "evdev", "evdev memory"); 71 72 /* adb keyboard driver used on powerpc does not support evdev yet */ 73 #if defined(__powerpc__) && !defined(__powerpc64__) 74 int evdev_rcpt_mask = EVDEV_RCPT_KBDMUX | EVDEV_RCPT_HW_MOUSE; 75 #else 76 int evdev_rcpt_mask = EVDEV_RCPT_HW_MOUSE | EVDEV_RCPT_HW_KBD; 77 #endif 78 int evdev_sysmouse_t_axis = 0; 79 80 SYSCTL_NODE(_kern, OID_AUTO, evdev, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 81 "Evdev args"); 82 #ifdef EVDEV_SUPPORT 83 SYSCTL_INT(_kern_evdev, OID_AUTO, rcpt_mask, CTLFLAG_RWTUN, &evdev_rcpt_mask, 0, 84 "Who is receiving events: bit0 - sysmouse, bit1 - kbdmux, " 85 "bit2 - mouse hardware, bit3 - keyboard hardware"); 86 SYSCTL_INT(_kern_evdev, OID_AUTO, sysmouse_t_axis, CTLFLAG_RWTUN, 87 &evdev_sysmouse_t_axis, 0, "Extract T-axis from 0-none, 1-ums, 2-psm"); 88 #endif 89 SYSCTL_NODE(_kern_evdev, OID_AUTO, input, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 90 "Evdev input devices"); 91 92 static void evdev_start_repeat(struct evdev_dev *, uint16_t); 93 static void evdev_stop_repeat(struct evdev_dev *); 94 static int evdev_check_event(struct evdev_dev *, uint16_t, uint16_t, int32_t); 95 96 struct evdev_dev * 97 evdev_alloc(void) 98 { 99 100 return malloc(sizeof(struct evdev_dev), M_EVDEV, M_WAITOK | M_ZERO); 101 } 102 103 void 104 evdev_free(struct evdev_dev *evdev) 105 { 106 107 if (evdev != NULL && evdev->ev_cdev != NULL && 108 evdev->ev_cdev->si_drv1 != NULL) 109 evdev_unregister(evdev); 110 111 free(evdev, M_EVDEV); 112 } 113 114 static struct input_absinfo * 115 evdev_alloc_absinfo(void) 116 { 117 118 return (malloc(sizeof(struct input_absinfo) * ABS_CNT, M_EVDEV, 119 M_WAITOK | M_ZERO)); 120 } 121 122 static void 123 evdev_free_absinfo(struct input_absinfo *absinfo) 124 { 125 126 free(absinfo, M_EVDEV); 127 } 128 129 int 130 evdev_set_report_size(struct evdev_dev *evdev, size_t report_size) 131 { 132 if (report_size > KEY_CNT + REL_CNT + ABS_CNT + MAX_MT_SLOTS * MT_CNT + 133 MSC_CNT + LED_CNT + SND_CNT + SW_CNT + FF_CNT) 134 return (EINVAL); 135 136 evdev->ev_report_size = report_size; 137 return (0); 138 } 139 140 static size_t 141 evdev_estimate_report_size(struct evdev_dev *evdev) 142 { 143 size_t size = 0; 144 int res; 145 146 /* 147 * Keyboards generate one event per report but other devices with 148 * buttons like mouses can report events simultaneously 149 */ 150 bit_ffs_at(evdev->ev_key_flags, KEY_OK, KEY_CNT - KEY_OK, &res); 151 if (res == -1) 152 bit_ffs(evdev->ev_key_flags, BTN_MISC, &res); 153 size += (res != -1); 154 bit_count(evdev->ev_key_flags, BTN_MISC, KEY_OK - BTN_MISC, &res); 155 size += res; 156 157 /* All relative axes can be reported simultaneously */ 158 bit_count(evdev->ev_rel_flags, 0, REL_CNT, &res); 159 size += res; 160 161 /* 162 * All absolute axes can be reported simultaneously. 163 * Multitouch axes can be reported ABS_MT_SLOT times 164 */ 165 if (evdev->ev_absinfo != NULL) { 166 bit_count(evdev->ev_abs_flags, 0, ABS_CNT, &res); 167 size += res; 168 bit_count(evdev->ev_abs_flags, ABS_MT_FIRST, MT_CNT, &res); 169 if (res > 0) { 170 res++; /* ABS_MT_SLOT or SYN_MT_REPORT */ 171 if (bit_test(evdev->ev_abs_flags, ABS_MT_SLOT)) 172 /* MT type B */ 173 size += res * MAXIMAL_MT_SLOT(evdev); 174 else 175 /* MT type A */ 176 size += res * (MAX_MT_REPORTS - 1); 177 } 178 } 179 180 /* All misc events can be reported simultaneously */ 181 bit_count(evdev->ev_msc_flags, 0, MSC_CNT, &res); 182 size += res; 183 184 /* All leds can be reported simultaneously */ 185 bit_count(evdev->ev_led_flags, 0, LED_CNT, &res); 186 size += res; 187 188 /* Assume other events are generated once per report */ 189 bit_ffs(evdev->ev_snd_flags, SND_CNT, &res); 190 size += (res != -1); 191 192 bit_ffs(evdev->ev_sw_flags, SW_CNT, &res); 193 size += (res != -1); 194 195 /* XXX: FF part is not implemented yet */ 196 197 size++; /* SYN_REPORT */ 198 return (size); 199 } 200 201 static void 202 evdev_sysctl_create(struct evdev_dev *evdev) 203 { 204 struct sysctl_oid *ev_sysctl_tree; 205 char ev_unit_str[8]; 206 207 snprintf(ev_unit_str, sizeof(ev_unit_str), "%d", evdev->ev_unit); 208 sysctl_ctx_init(&evdev->ev_sysctl_ctx); 209 210 ev_sysctl_tree = SYSCTL_ADD_NODE_WITH_LABEL(&evdev->ev_sysctl_ctx, 211 SYSCTL_STATIC_CHILDREN(_kern_evdev_input), OID_AUTO, 212 ev_unit_str, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "", 213 "device index"); 214 215 SYSCTL_ADD_STRING(&evdev->ev_sysctl_ctx, 216 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "name", CTLFLAG_RD, 217 evdev->ev_name, 0, 218 "Input device name"); 219 220 SYSCTL_ADD_STRUCT(&evdev->ev_sysctl_ctx, 221 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "id", CTLFLAG_RD, 222 &evdev->ev_id, input_id, 223 "Input device identification"); 224 225 /* ioctl returns ENOENT if phys is not set. sysctl returns "" here */ 226 SYSCTL_ADD_STRING(&evdev->ev_sysctl_ctx, 227 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "phys", CTLFLAG_RD, 228 evdev->ev_shortname, 0, 229 "Input device short name"); 230 231 /* ioctl returns ENOENT if uniq is not set. sysctl returns "" here */ 232 SYSCTL_ADD_STRING(&evdev->ev_sysctl_ctx, 233 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "uniq", CTLFLAG_RD, 234 evdev->ev_serial, 0, 235 "Input device unique number"); 236 237 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 238 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "props", CTLFLAG_RD, 239 evdev->ev_prop_flags, sizeof(evdev->ev_prop_flags), "", 240 "Input device properties"); 241 242 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 243 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "type_bits", CTLFLAG_RD, 244 evdev->ev_type_flags, sizeof(evdev->ev_type_flags), "", 245 "Input device supported events types"); 246 247 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 248 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "key_bits", CTLFLAG_RD, 249 evdev->ev_key_flags, sizeof(evdev->ev_key_flags), 250 "", "Input device supported keys"); 251 252 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 253 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "rel_bits", CTLFLAG_RD, 254 evdev->ev_rel_flags, sizeof(evdev->ev_rel_flags), "", 255 "Input device supported relative events"); 256 257 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 258 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "abs_bits", CTLFLAG_RD, 259 evdev->ev_abs_flags, sizeof(evdev->ev_abs_flags), "", 260 "Input device supported absolute events"); 261 262 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 263 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "msc_bits", CTLFLAG_RD, 264 evdev->ev_msc_flags, sizeof(evdev->ev_msc_flags), "", 265 "Input device supported miscellaneous events"); 266 267 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 268 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "led_bits", CTLFLAG_RD, 269 evdev->ev_led_flags, sizeof(evdev->ev_led_flags), "", 270 "Input device supported LED events"); 271 272 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 273 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "snd_bits", CTLFLAG_RD, 274 evdev->ev_snd_flags, sizeof(evdev->ev_snd_flags), "", 275 "Input device supported sound events"); 276 277 SYSCTL_ADD_OPAQUE(&evdev->ev_sysctl_ctx, 278 SYSCTL_CHILDREN(ev_sysctl_tree), OID_AUTO, "sw_bits", CTLFLAG_RD, 279 evdev->ev_sw_flags, sizeof(evdev->ev_sw_flags), "", 280 "Input device supported switch events"); 281 } 282 283 static int 284 evdev_register_common(struct evdev_dev *evdev) 285 { 286 int ret; 287 288 debugf(evdev, "%s: registered evdev provider: %s <%s>\n", 289 evdev->ev_shortname, evdev->ev_name, evdev->ev_serial); 290 291 /* Initialize internal structures */ 292 CK_SLIST_INIT(&evdev->ev_clients); 293 sx_init(&evdev->ev_list_lock, "evsx"); 294 295 if (evdev_event_supported(evdev, EV_REP) && 296 bit_test(evdev->ev_flags, EVDEV_FLAG_SOFTREPEAT)) { 297 /* Initialize callout */ 298 callout_init_mtx(&evdev->ev_rep_callout, 299 evdev->ev_state_lock, 0); 300 301 if (evdev->ev_rep[REP_DELAY] == 0 && 302 evdev->ev_rep[REP_PERIOD] == 0) { 303 /* Supply default values */ 304 evdev->ev_rep[REP_DELAY] = 250; 305 evdev->ev_rep[REP_PERIOD] = 33; 306 } 307 } 308 309 /* Initialize multitouch protocol type B states or A to B converter */ 310 if (bit_test(evdev->ev_abs_flags, ABS_MT_SLOT) || 311 bit_test(evdev->ev_flags, EVDEV_FLAG_MT_TRACK)) 312 evdev_mt_init(evdev); 313 314 /* Estimate maximum report size */ 315 if (evdev->ev_report_size == 0) { 316 ret = evdev_set_report_size(evdev, 317 evdev_estimate_report_size(evdev)); 318 if (ret != 0) 319 goto bail_out; 320 } 321 322 /* Create char device node */ 323 ret = evdev_cdev_create(evdev); 324 if (ret != 0) 325 goto bail_out; 326 327 /* Create sysctls (for device enumeration without /dev/input access rights) */ 328 evdev_sysctl_create(evdev); 329 330 bail_out: 331 if (ret != 0) 332 sx_destroy(&evdev->ev_list_lock); 333 return (ret); 334 } 335 336 int 337 evdev_register(struct evdev_dev *evdev) 338 { 339 int ret; 340 341 if (bit_test(evdev->ev_flags, EVDEV_FLAG_EXT_EPOCH)) 342 evdev->ev_lock_type = EV_LOCK_EXT_EPOCH; 343 else 344 evdev->ev_lock_type = EV_LOCK_INTERNAL; 345 evdev->ev_state_lock = &evdev->ev_mtx; 346 mtx_init(&evdev->ev_mtx, "evmtx", NULL, MTX_DEF); 347 348 ret = evdev_register_common(evdev); 349 if (ret != 0) 350 mtx_destroy(&evdev->ev_mtx); 351 352 return (ret); 353 } 354 355 int 356 evdev_register_mtx(struct evdev_dev *evdev, struct mtx *mtx) 357 { 358 359 evdev->ev_lock_type = EV_LOCK_MTX; 360 evdev->ev_state_lock = mtx; 361 return (evdev_register_common(evdev)); 362 } 363 364 int 365 evdev_unregister(struct evdev_dev *evdev) 366 { 367 struct evdev_client *client, *tmp; 368 int ret; 369 debugf(evdev, "%s: unregistered evdev provider: %s\n", 370 evdev->ev_shortname, evdev->ev_name); 371 372 sysctl_ctx_free(&evdev->ev_sysctl_ctx); 373 374 EVDEV_LIST_LOCK(evdev); 375 evdev->ev_cdev->si_drv1 = NULL; 376 /* Wake up sleepers */ 377 CK_SLIST_FOREACH_SAFE(client, &evdev->ev_clients, ec_link, tmp) { 378 evdev_revoke_client(client); 379 evdev_dispose_client(evdev, client); 380 EVDEV_CLIENT_LOCKQ(client); 381 evdev_notify_event(client); 382 EVDEV_CLIENT_UNLOCKQ(client); 383 } 384 EVDEV_LIST_UNLOCK(evdev); 385 386 /* release lock to avoid deadlock with evdev_dtor */ 387 ret = evdev_cdev_destroy(evdev); 388 evdev->ev_cdev = NULL; 389 sx_destroy(&evdev->ev_list_lock); 390 if (ret == 0 && evdev->ev_lock_type != EV_LOCK_MTX) 391 mtx_destroy(&evdev->ev_mtx); 392 393 evdev_free_absinfo(evdev->ev_absinfo); 394 evdev_mt_free(evdev); 395 396 return (ret); 397 } 398 399 inline void 400 evdev_set_name(struct evdev_dev *evdev, const char *name) 401 { 402 403 snprintf(evdev->ev_name, NAMELEN, "%s", name); 404 } 405 406 inline void 407 evdev_set_id(struct evdev_dev *evdev, uint16_t bustype, uint16_t vendor, 408 uint16_t product, uint16_t version) 409 { 410 411 evdev->ev_id = (struct input_id) { 412 .bustype = bustype, 413 .vendor = vendor, 414 .product = product, 415 .version = version 416 }; 417 } 418 419 inline void 420 evdev_set_phys(struct evdev_dev *evdev, const char *name) 421 { 422 423 snprintf(evdev->ev_shortname, NAMELEN, "%s", name); 424 } 425 426 inline void 427 evdev_set_serial(struct evdev_dev *evdev, const char *serial) 428 { 429 430 snprintf(evdev->ev_serial, NAMELEN, "%s", serial); 431 } 432 433 inline void 434 evdev_set_methods(struct evdev_dev *evdev, void *softc, 435 const struct evdev_methods *methods) 436 { 437 438 evdev->ev_methods = methods; 439 evdev->ev_softc = softc; 440 } 441 442 inline void * 443 evdev_get_softc(struct evdev_dev *evdev) 444 { 445 446 return (evdev->ev_softc); 447 } 448 449 inline void 450 evdev_support_prop(struct evdev_dev *evdev, uint16_t prop) 451 { 452 453 KASSERT(prop < INPUT_PROP_CNT, ("invalid evdev input property")); 454 bit_set(evdev->ev_prop_flags, prop); 455 } 456 457 inline void 458 evdev_support_event(struct evdev_dev *evdev, uint16_t type) 459 { 460 461 KASSERT(type < EV_CNT, ("invalid evdev event property")); 462 bit_set(evdev->ev_type_flags, type); 463 } 464 465 inline void 466 evdev_support_key(struct evdev_dev *evdev, uint16_t code) 467 { 468 469 KASSERT(code < KEY_CNT, ("invalid evdev key property")); 470 bit_set(evdev->ev_key_flags, code); 471 } 472 473 inline void 474 evdev_support_rel(struct evdev_dev *evdev, uint16_t code) 475 { 476 477 KASSERT(code < REL_CNT, ("invalid evdev rel property")); 478 bit_set(evdev->ev_rel_flags, code); 479 } 480 481 inline void 482 evdev_support_abs(struct evdev_dev *evdev, uint16_t code, int32_t minimum, 483 int32_t maximum, int32_t fuzz, int32_t flat, int32_t resolution) 484 { 485 struct input_absinfo absinfo; 486 487 KASSERT(code < ABS_CNT, ("invalid evdev abs property")); 488 489 absinfo = (struct input_absinfo) { 490 .value = 0, 491 .minimum = minimum, 492 .maximum = maximum, 493 .fuzz = fuzz, 494 .flat = flat, 495 .resolution = resolution, 496 }; 497 evdev_set_abs_bit(evdev, code); 498 evdev_set_absinfo(evdev, code, &absinfo); 499 } 500 501 inline void 502 evdev_set_abs_bit(struct evdev_dev *evdev, uint16_t code) 503 { 504 505 KASSERT(code < ABS_CNT, ("invalid evdev abs property")); 506 if (evdev->ev_absinfo == NULL) 507 evdev->ev_absinfo = evdev_alloc_absinfo(); 508 bit_set(evdev->ev_abs_flags, code); 509 } 510 511 inline void 512 evdev_support_msc(struct evdev_dev *evdev, uint16_t code) 513 { 514 515 KASSERT(code < MSC_CNT, ("invalid evdev msc property")); 516 bit_set(evdev->ev_msc_flags, code); 517 } 518 519 520 inline void 521 evdev_support_led(struct evdev_dev *evdev, uint16_t code) 522 { 523 524 KASSERT(code < LED_CNT, ("invalid evdev led property")); 525 bit_set(evdev->ev_led_flags, code); 526 } 527 528 inline void 529 evdev_support_snd(struct evdev_dev *evdev, uint16_t code) 530 { 531 532 KASSERT(code < SND_CNT, ("invalid evdev snd property")); 533 bit_set(evdev->ev_snd_flags, code); 534 } 535 536 inline void 537 evdev_support_sw(struct evdev_dev *evdev, uint16_t code) 538 { 539 540 KASSERT(code < SW_CNT, ("invalid evdev sw property")); 541 bit_set(evdev->ev_sw_flags, code); 542 } 543 544 bool 545 evdev_event_supported(struct evdev_dev *evdev, uint16_t type) 546 { 547 548 KASSERT(type < EV_CNT, ("invalid evdev event property")); 549 return (bit_test(evdev->ev_type_flags, type)); 550 } 551 552 inline void 553 evdev_set_absinfo(struct evdev_dev *evdev, uint16_t axis, 554 struct input_absinfo *absinfo) 555 { 556 557 KASSERT(axis < ABS_CNT, ("invalid evdev abs property")); 558 559 if (axis == ABS_MT_SLOT && 560 (absinfo->maximum < 1 || absinfo->maximum >= MAX_MT_SLOTS)) 561 return; 562 563 if (evdev->ev_absinfo == NULL) 564 evdev->ev_absinfo = evdev_alloc_absinfo(); 565 566 if (axis == ABS_MT_SLOT) 567 evdev->ev_absinfo[ABS_MT_SLOT].maximum = absinfo->maximum; 568 else 569 memcpy(&evdev->ev_absinfo[axis], absinfo, 570 sizeof(struct input_absinfo)); 571 } 572 573 inline void 574 evdev_set_repeat_params(struct evdev_dev *evdev, uint16_t property, int value) 575 { 576 577 KASSERT(property < REP_CNT, ("invalid evdev repeat property")); 578 evdev->ev_rep[property] = value; 579 } 580 581 inline void 582 evdev_set_flag(struct evdev_dev *evdev, uint16_t flag) 583 { 584 585 KASSERT(flag < EVDEV_FLAG_CNT, ("invalid evdev flag property")); 586 bit_set(evdev->ev_flags, flag); 587 } 588 589 static int 590 evdev_check_event(struct evdev_dev *evdev, uint16_t type, uint16_t code, 591 int32_t value) 592 { 593 594 if (type >= EV_CNT) 595 return (EINVAL); 596 597 /* Allow SYN events implicitly */ 598 if (type != EV_SYN && !evdev_event_supported(evdev, type)) 599 return (EINVAL); 600 601 switch (type) { 602 case EV_SYN: 603 if (code >= SYN_CNT) 604 return (EINVAL); 605 break; 606 607 case EV_KEY: 608 if (code >= KEY_CNT) 609 return (EINVAL); 610 if (!bit_test(evdev->ev_key_flags, code)) 611 return (EINVAL); 612 break; 613 614 case EV_REL: 615 if (code >= REL_CNT) 616 return (EINVAL); 617 if (!bit_test(evdev->ev_rel_flags, code)) 618 return (EINVAL); 619 break; 620 621 case EV_ABS: 622 if (code >= ABS_CNT) 623 return (EINVAL); 624 if (!bit_test(evdev->ev_abs_flags, code)) 625 return (EINVAL); 626 if (code == ABS_MT_SLOT && 627 (value < 0 || value > MAXIMAL_MT_SLOT(evdev))) 628 return (EINVAL); 629 if (ABS_IS_MT(code) && evdev->ev_mt == NULL && 630 bit_test(evdev->ev_abs_flags, ABS_MT_SLOT)) 631 return (EINVAL); 632 break; 633 634 case EV_MSC: 635 if (code >= MSC_CNT) 636 return (EINVAL); 637 if (!bit_test(evdev->ev_msc_flags, code)) 638 return (EINVAL); 639 break; 640 641 case EV_LED: 642 if (code >= LED_CNT) 643 return (EINVAL); 644 if (!bit_test(evdev->ev_led_flags, code)) 645 return (EINVAL); 646 break; 647 648 case EV_SND: 649 if (code >= SND_CNT) 650 return (EINVAL); 651 if (!bit_test(evdev->ev_snd_flags, code)) 652 return (EINVAL); 653 break; 654 655 case EV_SW: 656 if (code >= SW_CNT) 657 return (EINVAL); 658 if (!bit_test(evdev->ev_sw_flags, code)) 659 return (EINVAL); 660 break; 661 662 case EV_REP: 663 if (code >= REP_CNT) 664 return (EINVAL); 665 break; 666 667 default: 668 return (EINVAL); 669 } 670 671 return (0); 672 } 673 674 static void 675 evdev_modify_event(struct evdev_dev *evdev, uint16_t type, uint16_t code, 676 int32_t *value) 677 { 678 int32_t fuzz, old_value, abs_change; 679 680 EVDEV_LOCK_ASSERT(evdev); 681 682 switch (type) { 683 case EV_KEY: 684 if (!evdev_event_supported(evdev, EV_REP)) 685 break; 686 687 if (!bit_test(evdev->ev_flags, EVDEV_FLAG_SOFTREPEAT)) { 688 /* Detect driver key repeats. */ 689 if (bit_test(evdev->ev_key_states, code) && 690 *value == KEY_EVENT_DOWN) 691 *value = KEY_EVENT_REPEAT; 692 } else { 693 /* Start/stop callout for evdev repeats */ 694 if (bit_test(evdev->ev_key_states, code) == !*value && 695 !CK_SLIST_EMPTY(&evdev->ev_clients)) { 696 if (*value == KEY_EVENT_DOWN) 697 evdev_start_repeat(evdev, code); 698 else 699 evdev_stop_repeat(evdev); 700 } 701 } 702 break; 703 704 case EV_ABS: 705 if (code == ABS_MT_SLOT) 706 break; 707 else if (!ABS_IS_MT(code)) 708 old_value = evdev->ev_absinfo[code].value; 709 else if (!bit_test(evdev->ev_abs_flags, ABS_MT_SLOT)) 710 /* Pass MT protocol type A events as is */ 711 break; 712 else if (code == ABS_MT_TRACKING_ID) { 713 *value = evdev_mt_reassign_id(evdev, 714 evdev_mt_get_last_slot(evdev), *value); 715 break; 716 } else 717 old_value = evdev_mt_get_value(evdev, 718 evdev_mt_get_last_slot(evdev), code); 719 720 fuzz = evdev->ev_absinfo[code].fuzz; 721 if (fuzz == 0) 722 break; 723 724 abs_change = abs(*value - old_value); 725 if (abs_change < fuzz / 2) 726 *value = old_value; 727 else if (abs_change < fuzz) 728 *value = (old_value * 3 + *value) / 4; 729 else if (abs_change < fuzz * 2) 730 *value = (old_value + *value) / 2; 731 break; 732 } 733 } 734 735 static enum evdev_sparse_result 736 evdev_sparse_event(struct evdev_dev *evdev, uint16_t type, uint16_t code, 737 int32_t value) 738 { 739 int32_t last_mt_slot; 740 741 EVDEV_LOCK_ASSERT(evdev); 742 743 /* 744 * For certain event types, update device state bits 745 * and convert level reporting to edge reporting 746 */ 747 switch (type) { 748 case EV_KEY: 749 switch (value) { 750 case KEY_EVENT_UP: 751 case KEY_EVENT_DOWN: 752 if (bit_test(evdev->ev_key_states, code) == value) 753 return (EV_SKIP_EVENT); 754 bit_change(evdev->ev_key_states, code, value); 755 break; 756 757 case KEY_EVENT_REPEAT: 758 if (bit_test(evdev->ev_key_states, code) == 0 || 759 !evdev_event_supported(evdev, EV_REP)) 760 return (EV_SKIP_EVENT); 761 break; 762 763 default: 764 return (EV_SKIP_EVENT); 765 } 766 break; 767 768 case EV_LED: 769 if (bit_test(evdev->ev_led_states, code) == value) 770 return (EV_SKIP_EVENT); 771 bit_change(evdev->ev_led_states, code, value); 772 break; 773 774 case EV_SND: 775 bit_change(evdev->ev_snd_states, code, value); 776 break; 777 778 case EV_SW: 779 if (bit_test(evdev->ev_sw_states, code) == value) 780 return (EV_SKIP_EVENT); 781 bit_change(evdev->ev_sw_states, code, value); 782 break; 783 784 case EV_REP: 785 if (evdev->ev_rep[code] == value) 786 return (EV_SKIP_EVENT); 787 evdev_set_repeat_params(evdev, code, value); 788 break; 789 790 case EV_REL: 791 if (value == 0) 792 return (EV_SKIP_EVENT); 793 break; 794 795 /* For EV_ABS, save last value in absinfo and ev_mt_states */ 796 case EV_ABS: 797 switch (code) { 798 case ABS_MT_SLOT: 799 /* Postpone ABS_MT_SLOT till next event */ 800 evdev_mt_set_last_slot(evdev, value); 801 return (EV_SKIP_EVENT); 802 803 case ABS_MT_FIRST ... ABS_MT_LAST: 804 /* Pass MT protocol type A events as is */ 805 if (!bit_test(evdev->ev_abs_flags, ABS_MT_SLOT)) 806 break; 807 /* Don`t repeat MT protocol type B events */ 808 last_mt_slot = evdev_mt_get_last_slot(evdev); 809 if (evdev_mt_get_value(evdev, last_mt_slot, code) 810 == value) 811 return (EV_SKIP_EVENT); 812 evdev_mt_set_value(evdev, last_mt_slot, code, value); 813 if (last_mt_slot != CURRENT_MT_SLOT(evdev)) { 814 CURRENT_MT_SLOT(evdev) = last_mt_slot; 815 evdev->ev_report_opened = true; 816 return (EV_REPORT_MT_SLOT); 817 } 818 break; 819 820 default: 821 if (evdev->ev_absinfo[code].value == value) 822 return (EV_SKIP_EVENT); 823 evdev->ev_absinfo[code].value = value; 824 } 825 break; 826 827 case EV_SYN: 828 if (code == SYN_REPORT) { 829 /* Count empty reports as well as non empty */ 830 evdev->ev_report_count++; 831 /* Skip empty reports */ 832 if (!evdev->ev_report_opened) 833 return (EV_SKIP_EVENT); 834 evdev->ev_report_opened = false; 835 return (EV_REPORT_EVENT); 836 } 837 break; 838 } 839 840 evdev->ev_report_opened = true; 841 return (EV_REPORT_EVENT); 842 } 843 844 static void 845 evdev_propagate_event(struct evdev_dev *evdev, uint16_t type, uint16_t code, 846 int32_t value) 847 { 848 struct epoch_tracker et; 849 struct evdev_client *client; 850 851 debugf(evdev, "%s pushed event %d/%d/%d", 852 evdev->ev_shortname, type, code, value); 853 854 EVDEV_LOCK_ASSERT(evdev); 855 856 /* Propagate event through all clients */ 857 if (evdev->ev_lock_type == EV_LOCK_INTERNAL) 858 epoch_enter_preempt(INPUT_EPOCH, &et); 859 860 KASSERT( 861 evdev->ev_lock_type == EV_LOCK_MTX || in_epoch(INPUT_EPOCH) != 0, 862 ("Input epoch has not been entered\n")); 863 864 CK_SLIST_FOREACH(client, &evdev->ev_clients, ec_link) { 865 if (evdev->ev_grabber != NULL && evdev->ev_grabber != client) 866 continue; 867 868 EVDEV_CLIENT_LOCKQ(client); 869 evdev_client_push(client, type, code, value); 870 if (type == EV_SYN && code == SYN_REPORT) 871 evdev_notify_event(client); 872 EVDEV_CLIENT_UNLOCKQ(client); 873 } 874 if (evdev->ev_lock_type == EV_LOCK_INTERNAL) 875 epoch_exit_preempt(INPUT_EPOCH, &et); 876 877 evdev->ev_event_count++; 878 } 879 880 void 881 evdev_send_event(struct evdev_dev *evdev, uint16_t type, uint16_t code, 882 int32_t value) 883 { 884 enum evdev_sparse_result sparse; 885 886 EVDEV_LOCK_ASSERT(evdev); 887 888 evdev_modify_event(evdev, type, code, &value); 889 sparse = evdev_sparse_event(evdev, type, code, value); 890 switch (sparse) { 891 case EV_REPORT_MT_SLOT: 892 /* report postponed ABS_MT_SLOT */ 893 evdev_propagate_event(evdev, EV_ABS, ABS_MT_SLOT, 894 CURRENT_MT_SLOT(evdev)); 895 /* FALLTHROUGH */ 896 case EV_REPORT_EVENT: 897 evdev_propagate_event(evdev, type, code, value); 898 /* FALLTHROUGH */ 899 case EV_SKIP_EVENT: 900 break; 901 } 902 } 903 904 void 905 evdev_restore_after_kdb(struct evdev_dev *evdev) 906 { 907 int code; 908 909 EVDEV_LOCK_ASSERT(evdev); 910 911 /* Report postponed leds */ 912 bit_foreach(evdev->ev_kdb_led_states, LED_CNT, code) 913 evdev_send_event(evdev, EV_LED, code, 914 !bit_test(evdev->ev_led_states, code)); 915 bit_nclear(evdev->ev_kdb_led_states, 0, LED_MAX); 916 917 /* Release stuck keys (CTRL + ALT + ESC) */ 918 evdev_stop_repeat(evdev); 919 bit_foreach(evdev->ev_key_states, KEY_CNT, code) 920 evdev_send_event(evdev, EV_KEY, code, KEY_EVENT_UP); 921 evdev_send_event(evdev, EV_SYN, SYN_REPORT, 1); 922 } 923 924 int 925 evdev_push_event(struct evdev_dev *evdev, uint16_t type, uint16_t code, 926 int32_t value) 927 { 928 929 if (evdev_check_event(evdev, type, code, value) != 0) 930 return (EINVAL); 931 932 /* 933 * Discard all but LEDs kdb events as unrelated to userspace. 934 * Aggregate LED updates and postpone reporting until kdb deactivation. 935 */ 936 if (kdb_active || SCHEDULER_STOPPED()) { 937 evdev->ev_kdb_active = true; 938 if (type == EV_LED) 939 bit_set(evdev->ev_kdb_led_states, 940 bit_test(evdev->ev_led_states, code) != value); 941 return (0); 942 } 943 944 EVDEV_ENTER(evdev); 945 946 /* Fix evdev state corrupted with discarding of kdb events */ 947 if (evdev->ev_kdb_active) { 948 evdev->ev_kdb_active = false; 949 evdev_restore_after_kdb(evdev); 950 } 951 952 if (type == EV_SYN && code == SYN_REPORT && 953 bit_test(evdev->ev_abs_flags, ABS_MT_SLOT)) 954 evdev_mt_sync_frame(evdev); 955 else 956 if (bit_test(evdev->ev_flags, EVDEV_FLAG_MT_TRACK) && 957 evdev_mt_record_event(evdev, type, code, value)) 958 goto exit; 959 960 evdev_send_event(evdev, type, code, value); 961 exit: 962 EVDEV_EXIT(evdev); 963 964 return (0); 965 } 966 967 int 968 evdev_inject_event(struct evdev_dev *evdev, uint16_t type, uint16_t code, 969 int32_t value) 970 { 971 struct epoch_tracker et; 972 int ret = 0; 973 974 switch (type) { 975 case EV_REP: 976 /* evdev repeats should not be processed by hardware driver */ 977 if (bit_test(evdev->ev_flags, EVDEV_FLAG_SOFTREPEAT)) 978 goto push; 979 /* FALLTHROUGH */ 980 case EV_LED: 981 case EV_MSC: 982 case EV_SND: 983 case EV_FF: 984 if (evdev->ev_methods != NULL && 985 evdev->ev_methods->ev_event != NULL) 986 evdev->ev_methods->ev_event(evdev, type, code, value); 987 /* 988 * Leds and driver repeats should be reported in ev_event 989 * method body to interoperate with kbdmux states and rates 990 * propagation so both ways (ioctl and evdev) of changing it 991 * will produce only one evdev event report to client. 992 */ 993 if (type == EV_LED || type == EV_REP) 994 break; 995 /* FALLTHROUGH */ 996 case EV_SYN: 997 case EV_KEY: 998 case EV_REL: 999 case EV_ABS: 1000 case EV_SW: 1001 push: 1002 if (evdev->ev_lock_type == EV_LOCK_MTX) 1003 EVDEV_LOCK(evdev); 1004 else if (evdev->ev_lock_type == EV_LOCK_EXT_EPOCH) 1005 epoch_enter_preempt(INPUT_EPOCH, &et); 1006 ret = evdev_push_event(evdev, type, code, value); 1007 if (evdev->ev_lock_type == EV_LOCK_MTX) 1008 EVDEV_UNLOCK(evdev); 1009 else if (evdev->ev_lock_type == EV_LOCK_EXT_EPOCH) 1010 epoch_exit_preempt(INPUT_EPOCH, &et); 1011 1012 break; 1013 1014 default: 1015 ret = EINVAL; 1016 } 1017 1018 return (ret); 1019 } 1020 1021 int 1022 evdev_register_client(struct evdev_dev *evdev, struct evdev_client *client) 1023 { 1024 int ret = 0; 1025 1026 debugf(evdev, "adding new client for device %s", evdev->ev_shortname); 1027 1028 EVDEV_LIST_LOCK_ASSERT(evdev); 1029 1030 if (CK_SLIST_EMPTY(&evdev->ev_clients) && evdev->ev_methods != NULL && 1031 evdev->ev_methods->ev_open != NULL) { 1032 debugf(evdev, "calling ev_open() on device %s", 1033 evdev->ev_shortname); 1034 ret = evdev->ev_methods->ev_open(evdev); 1035 } 1036 if (ret == 0) 1037 CK_SLIST_INSERT_HEAD(&evdev->ev_clients, client, ec_link); 1038 return (ret); 1039 } 1040 1041 void 1042 evdev_dispose_client(struct evdev_dev *evdev, struct evdev_client *client) 1043 { 1044 debugf(evdev, "removing client for device %s", evdev->ev_shortname); 1045 1046 EVDEV_LIST_LOCK_ASSERT(evdev); 1047 1048 CK_SLIST_REMOVE(&evdev->ev_clients, client, evdev_client, ec_link); 1049 if (CK_SLIST_EMPTY(&evdev->ev_clients)) { 1050 if (evdev->ev_methods != NULL && 1051 evdev->ev_methods->ev_close != NULL) 1052 (void)evdev->ev_methods->ev_close(evdev); 1053 if (evdev_event_supported(evdev, EV_REP) && 1054 bit_test(evdev->ev_flags, EVDEV_FLAG_SOFTREPEAT)) { 1055 if (evdev->ev_lock_type != EV_LOCK_MTX) 1056 EVDEV_LOCK(evdev); 1057 evdev_stop_repeat(evdev); 1058 if (evdev->ev_lock_type != EV_LOCK_MTX) 1059 EVDEV_UNLOCK(evdev); 1060 } 1061 } 1062 if (evdev->ev_lock_type != EV_LOCK_MTX) 1063 EVDEV_LOCK(evdev); 1064 evdev_release_client(evdev, client); 1065 if (evdev->ev_lock_type != EV_LOCK_MTX) 1066 EVDEV_UNLOCK(evdev); 1067 } 1068 1069 int 1070 evdev_grab_client(struct evdev_dev *evdev, struct evdev_client *client) 1071 { 1072 1073 EVDEV_LOCK_ASSERT(evdev); 1074 1075 if (evdev->ev_grabber != NULL) 1076 return (EBUSY); 1077 1078 evdev->ev_grabber = client; 1079 1080 return (0); 1081 } 1082 1083 int 1084 evdev_release_client(struct evdev_dev *evdev, struct evdev_client *client) 1085 { 1086 1087 EVDEV_LOCK_ASSERT(evdev); 1088 1089 if (evdev->ev_grabber != client) 1090 return (EINVAL); 1091 1092 evdev->ev_grabber = NULL; 1093 1094 return (0); 1095 } 1096 1097 bool 1098 evdev_is_grabbed(struct evdev_dev *evdev) 1099 { 1100 if (kdb_active || SCHEDULER_STOPPED()) 1101 return (false); 1102 /* 1103 * The function is intended to be called from evdev-unrelated parts of 1104 * code like syscons-compatible parts of mouse and keyboard drivers. 1105 * That makes unlocked read-only access acceptable. 1106 */ 1107 return (evdev->ev_grabber != NULL); 1108 } 1109 1110 static void 1111 evdev_repeat_callout(void *arg) 1112 { 1113 struct epoch_tracker et; 1114 struct evdev_dev *evdev = (struct evdev_dev *)arg; 1115 1116 if (evdev->ev_lock_type == EV_LOCK_EXT_EPOCH) 1117 epoch_enter_preempt(INPUT_EPOCH, &et); 1118 evdev_send_event(evdev, EV_KEY, evdev->ev_rep_key, KEY_EVENT_REPEAT); 1119 evdev_send_event(evdev, EV_SYN, SYN_REPORT, 1); 1120 if (evdev->ev_lock_type == EV_LOCK_EXT_EPOCH) 1121 epoch_exit_preempt(INPUT_EPOCH, &et); 1122 1123 if (evdev->ev_rep[REP_PERIOD]) 1124 callout_reset(&evdev->ev_rep_callout, 1125 evdev->ev_rep[REP_PERIOD] * hz / 1000, 1126 evdev_repeat_callout, evdev); 1127 else 1128 evdev->ev_rep_key = KEY_RESERVED; 1129 } 1130 1131 static void 1132 evdev_start_repeat(struct evdev_dev *evdev, uint16_t key) 1133 { 1134 1135 EVDEV_LOCK_ASSERT(evdev); 1136 1137 if (evdev->ev_rep[REP_DELAY]) { 1138 evdev->ev_rep_key = key; 1139 callout_reset(&evdev->ev_rep_callout, 1140 evdev->ev_rep[REP_DELAY] * hz / 1000, 1141 evdev_repeat_callout, evdev); 1142 } 1143 } 1144 1145 static void 1146 evdev_stop_repeat(struct evdev_dev *evdev) 1147 { 1148 1149 EVDEV_LOCK_ASSERT(evdev); 1150 1151 if (evdev->ev_rep_key != KEY_RESERVED) { 1152 callout_stop(&evdev->ev_rep_callout); 1153 evdev->ev_rep_key = KEY_RESERVED; 1154 } 1155 } 1156 1157 MODULE_VERSION(evdev, 1);
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