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