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