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sys/dev/hid/hidbus.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2019-2020 Vladimir Kondratyev <wulf@FreeBSD.org> 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 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/ck.h> 34 #include <sys/epoch.h> 35 #include <sys/kdb.h> 36 #include <sys/kernel.h> 37 #include <sys/libkern.h> 38 #include <sys/lock.h> 39 #include <sys/malloc.h> 40 #include <sys/module.h> 41 #include <sys/mutex.h> 42 #include <sys/proc.h> 43 #include <sys/systm.h> 44 #include <sys/sx.h> 45 46 #define HID_DEBUG_VAR hid_debug 47 #include <dev/hid/hid.h> 48 #include <dev/hid/hidbus.h> 49 #include <dev/hid/hidquirk.h> 50 51 #include "hid_if.h" 52 53 #define INPUT_EPOCH global_epoch_preempt 54 #define HID_RSIZE_MAX 1024 55 56 static hid_intr_t hidbus_intr; 57 58 static device_probe_t hidbus_probe; 59 static device_attach_t hidbus_attach; 60 static device_detach_t hidbus_detach; 61 62 struct hidbus_ivars { 63 int32_t usage; 64 uint8_t index; 65 uint32_t flags; 66 uintptr_t driver_info; /* for internal use */ 67 struct mtx *mtx; /* child intr mtx */ 68 hid_intr_t *intr_handler; /* executed under mtx*/ 69 void *intr_ctx; 70 unsigned int refcnt; /* protected by mtx */ 71 struct epoch_context epoch_ctx; 72 CK_STAILQ_ENTRY(hidbus_ivars) link; 73 }; 74 75 struct hidbus_softc { 76 device_t dev; 77 struct sx sx; 78 struct mtx mtx; 79 80 bool nowrite; 81 82 struct hid_rdesc_info rdesc; 83 bool overloaded; 84 int nest; /* Child attach nesting lvl */ 85 int nauto; /* Number of autochildren */ 86 87 CK_STAILQ_HEAD(, hidbus_ivars) tlcs; 88 }; 89 90 static int 91 hidbus_fill_rdesc_info(struct hid_rdesc_info *hri, const void *data, 92 hid_size_t len) 93 { 94 int error = 0; 95 96 hri->data = __DECONST(void *, data); 97 hri->len = len; 98 99 /* 100 * If report descriptor is not available yet, set maximal 101 * report sizes high enough to allow hidraw to work. 102 */ 103 hri->isize = len == 0 ? HID_RSIZE_MAX : 104 hid_report_size_max(data, len, hid_input, &hri->iid); 105 hri->osize = len == 0 ? HID_RSIZE_MAX : 106 hid_report_size_max(data, len, hid_output, &hri->oid); 107 hri->fsize = len == 0 ? HID_RSIZE_MAX : 108 hid_report_size_max(data, len, hid_feature, &hri->fid); 109 110 if (hri->isize > HID_RSIZE_MAX) { 111 DPRINTF("input size is too large, %u bytes (truncating)\n", 112 hri->isize); 113 hri->isize = HID_RSIZE_MAX; 114 error = EOVERFLOW; 115 } 116 if (hri->osize > HID_RSIZE_MAX) { 117 DPRINTF("output size is too large, %u bytes (truncating)\n", 118 hri->osize); 119 hri->osize = HID_RSIZE_MAX; 120 error = EOVERFLOW; 121 } 122 if (hri->fsize > HID_RSIZE_MAX) { 123 DPRINTF("feature size is too large, %u bytes (truncating)\n", 124 hri->fsize); 125 hri->fsize = HID_RSIZE_MAX; 126 error = EOVERFLOW; 127 } 128 129 return (error); 130 } 131 132 int 133 hidbus_locate(const void *desc, hid_size_t size, int32_t u, enum hid_kind k, 134 uint8_t tlc_index, uint8_t index, struct hid_location *loc, 135 uint32_t *flags, uint8_t *id, struct hid_absinfo *ai) 136 { 137 struct hid_data *d; 138 struct hid_item h; 139 int i; 140 141 d = hid_start_parse(desc, size, 1 << k); 142 HIDBUS_FOREACH_ITEM(d, &h, tlc_index) { 143 for (i = 0; i < h.nusages; i++) { 144 if (h.kind == k && h.usages[i] == u) { 145 if (index--) 146 break; 147 if (loc != NULL) 148 *loc = h.loc; 149 if (flags != NULL) 150 *flags = h.flags; 151 if (id != NULL) 152 *id = h.report_ID; 153 if (ai != NULL && (h.flags&HIO_RELATIVE) == 0) 154 *ai = (struct hid_absinfo) { 155 .max = h.logical_maximum, 156 .min = h.logical_minimum, 157 .res = hid_item_resolution(&h), 158 }; 159 hid_end_parse(d); 160 return (1); 161 } 162 } 163 } 164 if (loc != NULL) 165 loc->size = 0; 166 if (flags != NULL) 167 *flags = 0; 168 if (id != NULL) 169 *id = 0; 170 hid_end_parse(d); 171 return (0); 172 } 173 174 bool 175 hidbus_is_collection(const void *desc, hid_size_t size, int32_t usage, 176 uint8_t tlc_index) 177 { 178 struct hid_data *d; 179 struct hid_item h; 180 bool ret = false; 181 182 d = hid_start_parse(desc, size, 0); 183 HIDBUS_FOREACH_ITEM(d, &h, tlc_index) { 184 if (h.kind == hid_collection && h.usage == usage) { 185 ret = true; 186 break; 187 } 188 } 189 hid_end_parse(d); 190 return (ret); 191 } 192 193 static device_t 194 hidbus_add_child(device_t dev, u_int order, const char *name, int unit) 195 { 196 struct hidbus_softc *sc = device_get_softc(dev); 197 struct hidbus_ivars *tlc; 198 device_t child; 199 200 child = device_add_child_ordered(dev, order, name, unit); 201 if (child == NULL) 202 return (child); 203 204 tlc = malloc(sizeof(struct hidbus_ivars), M_DEVBUF, M_WAITOK | M_ZERO); 205 tlc->mtx = &sc->mtx; 206 device_set_ivars(child, tlc); 207 sx_xlock(&sc->sx); 208 CK_STAILQ_INSERT_TAIL(&sc->tlcs, tlc, link); 209 sx_unlock(&sc->sx); 210 211 return (child); 212 } 213 214 static int 215 hidbus_enumerate_children(device_t dev, const void* data, hid_size_t len) 216 { 217 struct hidbus_softc *sc = device_get_softc(dev); 218 struct hid_data *hd; 219 struct hid_item hi; 220 device_t child; 221 uint8_t index = 0; 222 223 if (data == NULL || len == 0) 224 return (ENXIO); 225 226 /* Add a child for each top level collection */ 227 hd = hid_start_parse(data, len, 1 << hid_input); 228 while (hid_get_item(hd, &hi)) { 229 if (hi.kind != hid_collection || hi.collevel != 1) 230 continue; 231 child = BUS_ADD_CHILD(dev, 0, NULL, -1); 232 if (child == NULL) { 233 device_printf(dev, "Could not add HID device\n"); 234 continue; 235 } 236 hidbus_set_index(child, index); 237 hidbus_set_usage(child, hi.usage); 238 hidbus_set_flags(child, HIDBUS_FLAG_AUTOCHILD); 239 index++; 240 DPRINTF("Add child TLC: 0x%04x:0x%04x\n", 241 HID_GET_USAGE_PAGE(hi.usage), HID_GET_USAGE(hi.usage)); 242 } 243 hid_end_parse(hd); 244 245 if (index == 0) 246 return (ENXIO); 247 248 sc->nauto = index; 249 250 return (0); 251 } 252 253 static int 254 hidbus_attach_children(device_t dev) 255 { 256 struct hidbus_softc *sc = device_get_softc(dev); 257 int error; 258 259 HID_INTR_SETUP(device_get_parent(dev), hidbus_intr, sc, &sc->rdesc); 260 261 error = hidbus_enumerate_children(dev, sc->rdesc.data, sc->rdesc.len); 262 if (error != 0) 263 DPRINTF("failed to enumerate children: error %d\n", error); 264 265 /* 266 * hidbus_attach_children() can recurse through device_identify-> 267 * hid_set_report_descr() call sequence. Do not perform children 268 * attach twice in that case. 269 */ 270 sc->nest++; 271 bus_generic_probe(dev); 272 sc->nest--; 273 if (sc->nest != 0) 274 return (0); 275 276 if (hid_is_keyboard(sc->rdesc.data, sc->rdesc.len) != 0) 277 error = bus_generic_attach(dev); 278 else 279 error = bus_delayed_attach_children(dev); 280 if (error != 0) 281 device_printf(dev, "failed to attach child: error %d\n", error); 282 283 return (error); 284 } 285 286 static int 287 hidbus_detach_children(device_t dev) 288 { 289 device_t *children, bus; 290 bool is_bus; 291 int i, error; 292 293 error = 0; 294 295 is_bus = device_get_devclass(dev) == hidbus_devclass; 296 bus = is_bus ? dev : device_get_parent(dev); 297 298 KASSERT(device_get_devclass(bus) == hidbus_devclass, 299 ("Device is not hidbus or it's child")); 300 301 if (is_bus) { 302 /* If hidbus is passed, delete all children. */ 303 bus_generic_detach(bus); 304 device_delete_children(bus); 305 } else { 306 /* 307 * If hidbus child is passed, delete all hidbus children 308 * except caller. Deleting the caller may result in deadlock. 309 */ 310 error = device_get_children(bus, &children, &i); 311 if (error != 0) 312 return (error); 313 while (i-- > 0) { 314 if (children[i] == dev) 315 continue; 316 DPRINTF("Delete child. index=%d (%s)\n", 317 hidbus_get_index(children[i]), 318 device_get_nameunit(children[i])); 319 error = device_delete_child(bus, children[i]); 320 if (error) { 321 DPRINTF("Failed deleting %s\n", 322 device_get_nameunit(children[i])); 323 break; 324 } 325 } 326 free(children, M_TEMP); 327 } 328 329 HID_INTR_UNSETUP(device_get_parent(bus)); 330 331 return (error); 332 } 333 334 static int 335 hidbus_probe(device_t dev) 336 { 337 338 device_set_desc(dev, "HID bus"); 339 340 /* Allow other subclasses to override this driver. */ 341 return (BUS_PROBE_GENERIC); 342 } 343 344 static int 345 hidbus_attach(device_t dev) 346 { 347 struct hidbus_softc *sc = device_get_softc(dev); 348 struct hid_device_info *devinfo = device_get_ivars(dev); 349 void *d_ptr = NULL; 350 hid_size_t d_len; 351 int error; 352 353 sc->dev = dev; 354 CK_STAILQ_INIT(&sc->tlcs); 355 mtx_init(&sc->mtx, "hidbus ivar lock", NULL, MTX_DEF); 356 sx_init(&sc->sx, "hidbus ivar list lock"); 357 358 /* 359 * Ignore error. It is possible for non-HID device e.g. XBox360 gamepad 360 * to emulate HID through overloading of report descriptor. 361 */ 362 d_len = devinfo->rdescsize; 363 if (d_len != 0) { 364 d_ptr = malloc(d_len, M_DEVBUF, M_ZERO | M_WAITOK); 365 error = hid_get_rdesc(dev, d_ptr, d_len); 366 if (error != 0) { 367 free(d_ptr, M_DEVBUF); 368 d_len = 0; 369 d_ptr = NULL; 370 } 371 } 372 373 hidbus_fill_rdesc_info(&sc->rdesc, d_ptr, d_len); 374 375 sc->nowrite = hid_test_quirk(devinfo, HQ_NOWRITE); 376 377 error = hidbus_attach_children(dev); 378 if (error != 0) { 379 hidbus_detach(dev); 380 return (ENXIO); 381 } 382 383 return (0); 384 } 385 386 static int 387 hidbus_detach(device_t dev) 388 { 389 struct hidbus_softc *sc = device_get_softc(dev); 390 391 hidbus_detach_children(dev); 392 sx_destroy(&sc->sx); 393 mtx_destroy(&sc->mtx); 394 free(sc->rdesc.data, M_DEVBUF); 395 396 return (0); 397 } 398 399 static void 400 hidbus_child_detached(device_t bus, device_t child) 401 { 402 struct hidbus_softc *sc = device_get_softc(bus); 403 struct hidbus_ivars *tlc = device_get_ivars(child); 404 405 KASSERT(tlc->refcnt == 0, ("Child device is running")); 406 tlc->mtx = &sc->mtx; 407 tlc->intr_handler = NULL; 408 tlc->flags &= ~HIDBUS_FLAG_CAN_POLL; 409 } 410 411 /* 412 * Epoch callback indicating tlc is safe to destroy 413 */ 414 static void 415 hidbus_ivar_dtor(epoch_context_t ctx) 416 { 417 struct hidbus_ivars *tlc; 418 419 tlc = __containerof(ctx, struct hidbus_ivars, epoch_ctx); 420 free(tlc, M_DEVBUF); 421 } 422 423 static void 424 hidbus_child_deleted(device_t bus, device_t child) 425 { 426 struct hidbus_softc *sc = device_get_softc(bus); 427 struct hidbus_ivars *tlc = device_get_ivars(child); 428 429 sx_xlock(&sc->sx); 430 KASSERT(tlc->refcnt == 0, ("Child device is running")); 431 CK_STAILQ_REMOVE(&sc->tlcs, tlc, hidbus_ivars, link); 432 sx_unlock(&sc->sx); 433 epoch_call(INPUT_EPOCH, hidbus_ivar_dtor, &tlc->epoch_ctx); 434 } 435 436 static int 437 hidbus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result) 438 { 439 struct hidbus_softc *sc = device_get_softc(bus); 440 struct hidbus_ivars *tlc = device_get_ivars(child); 441 442 switch (which) { 443 case HIDBUS_IVAR_INDEX: 444 *result = tlc->index; 445 break; 446 case HIDBUS_IVAR_USAGE: 447 *result = tlc->usage; 448 break; 449 case HIDBUS_IVAR_FLAGS: 450 *result = tlc->flags; 451 break; 452 case HIDBUS_IVAR_DRIVER_INFO: 453 *result = tlc->driver_info; 454 break; 455 case HIDBUS_IVAR_LOCK: 456 *result = (uintptr_t)(tlc->mtx == &sc->mtx ? NULL : tlc->mtx); 457 break; 458 default: 459 return (EINVAL); 460 } 461 return (0); 462 } 463 464 static int 465 hidbus_write_ivar(device_t bus, device_t child, int which, uintptr_t value) 466 { 467 struct hidbus_softc *sc = device_get_softc(bus); 468 struct hidbus_ivars *tlc = device_get_ivars(child); 469 470 switch (which) { 471 case HIDBUS_IVAR_INDEX: 472 tlc->index = value; 473 break; 474 case HIDBUS_IVAR_USAGE: 475 tlc->usage = value; 476 break; 477 case HIDBUS_IVAR_FLAGS: 478 tlc->flags = value; 479 if ((value & HIDBUS_FLAG_CAN_POLL) != 0) 480 HID_INTR_SETUP( 481 device_get_parent(bus), NULL, NULL, NULL); 482 break; 483 case HIDBUS_IVAR_DRIVER_INFO: 484 tlc->driver_info = value; 485 break; 486 case HIDBUS_IVAR_LOCK: 487 tlc->mtx = (struct mtx *)value == NULL ? 488 &sc->mtx : (struct mtx *)value; 489 break; 490 default: 491 return (EINVAL); 492 } 493 return (0); 494 } 495 496 /* Location hint for devctl(8) */ 497 static int 498 hidbus_child_location_str(device_t bus, device_t child, char *buf, 499 size_t buflen) 500 { 501 struct hidbus_ivars *tlc = device_get_ivars(child); 502 503 snprintf(buf, buflen, "index=%hhu", tlc->index); 504 return (0); 505 } 506 507 /* PnP information for devctl(8) */ 508 static int 509 hidbus_child_pnpinfo_str(device_t bus, device_t child, char *buf, 510 size_t buflen) 511 { 512 struct hidbus_ivars *tlc = device_get_ivars(child); 513 struct hid_device_info *devinfo = device_get_ivars(bus); 514 515 snprintf(buf, buflen, "page=0x%04x usage=0x%04x bus=0x%02hx " 516 "vendor=0x%04hx product=0x%04hx version=0x%04hx%s%s", 517 HID_GET_USAGE_PAGE(tlc->usage), HID_GET_USAGE(tlc->usage), 518 devinfo->idBus, devinfo->idVendor, devinfo->idProduct, 519 devinfo->idVersion, devinfo->idPnP[0] == '\0' ? "" : " _HID=", 520 devinfo->idPnP[0] == '\0' ? "" : devinfo->idPnP); 521 return (0); 522 } 523 524 void 525 hidbus_set_desc(device_t child, const char *suffix) 526 { 527 device_t bus = device_get_parent(child); 528 struct hidbus_softc *sc = device_get_softc(bus); 529 struct hid_device_info *devinfo = device_get_ivars(bus); 530 struct hidbus_ivars *tlc = device_get_ivars(child); 531 char buf[80]; 532 533 /* Do not add NULL suffix or if device name already contains it. */ 534 if (suffix != NULL && strcasestr(devinfo->name, suffix) == NULL && 535 (sc->nauto > 1 || (tlc->flags & HIDBUS_FLAG_AUTOCHILD) == 0)) { 536 snprintf(buf, sizeof(buf), "%s %s", devinfo->name, suffix); 537 device_set_desc_copy(child, buf); 538 } else 539 device_set_desc(child, devinfo->name); 540 } 541 542 device_t 543 hidbus_find_child(device_t bus, int32_t usage) 544 { 545 device_t *children, child; 546 int ccount, i; 547 548 GIANT_REQUIRED; 549 550 /* Get a list of all hidbus children */ 551 if (device_get_children(bus, &children, &ccount) != 0) 552 return (NULL); 553 554 /* Scan through to find required TLC */ 555 for (i = 0, child = NULL; i < ccount; i++) { 556 if (hidbus_get_usage(children[i]) == usage) { 557 child = children[i]; 558 break; 559 } 560 } 561 free(children, M_TEMP); 562 563 return (child); 564 } 565 566 void 567 hidbus_intr(void *context, void *buf, hid_size_t len) 568 { 569 struct hidbus_softc *sc = context; 570 struct hidbus_ivars *tlc; 571 struct epoch_tracker et; 572 573 /* 574 * Broadcast input report to all subscribers. 575 * TODO: Add check for input report ID. 576 * 577 * Relock mutex on every TLC item as we can't hold any locks over whole 578 * TLC list here due to LOR with open()/close() handlers. 579 */ 580 if (!HID_IN_POLLING_MODE()) 581 epoch_enter_preempt(INPUT_EPOCH, &et); 582 CK_STAILQ_FOREACH(tlc, &sc->tlcs, link) { 583 if (tlc->refcnt == 0 || tlc->intr_handler == NULL) 584 continue; 585 if (HID_IN_POLLING_MODE()) { 586 if ((tlc->flags & HIDBUS_FLAG_CAN_POLL) != 0) 587 tlc->intr_handler(tlc->intr_ctx, buf, len); 588 } else { 589 mtx_lock(tlc->mtx); 590 tlc->intr_handler(tlc->intr_ctx, buf, len); 591 mtx_unlock(tlc->mtx); 592 } 593 } 594 if (!HID_IN_POLLING_MODE()) 595 epoch_exit_preempt(INPUT_EPOCH, &et); 596 } 597 598 void 599 hidbus_set_intr(device_t child, hid_intr_t *handler, void *context) 600 { 601 struct hidbus_ivars *tlc = device_get_ivars(child); 602 603 tlc->intr_handler = handler; 604 tlc->intr_ctx = context; 605 } 606 607 int 608 hidbus_intr_start(device_t child) 609 { 610 device_t bus = device_get_parent(child); 611 struct hidbus_softc *sc = device_get_softc(bus); 612 struct hidbus_ivars *ivar = device_get_ivars(child); 613 struct hidbus_ivars *tlc; 614 int refcnt = 0; 615 int error; 616 617 if (sx_xlock_sig(&sc->sx) != 0) 618 return (EINTR); 619 CK_STAILQ_FOREACH(tlc, &sc->tlcs, link) { 620 refcnt += tlc->refcnt; 621 if (tlc == ivar) { 622 mtx_lock(tlc->mtx); 623 ++tlc->refcnt; 624 mtx_unlock(tlc->mtx); 625 } 626 } 627 error = refcnt != 0 ? 0 : HID_INTR_START(device_get_parent(bus)); 628 sx_unlock(&sc->sx); 629 630 return (error); 631 } 632 633 int 634 hidbus_intr_stop(device_t child) 635 { 636 device_t bus = device_get_parent(child); 637 struct hidbus_softc *sc = device_get_softc(bus); 638 struct hidbus_ivars *ivar = device_get_ivars(child); 639 struct hidbus_ivars *tlc; 640 bool refcnt = 0; 641 int error; 642 643 if (sx_xlock_sig(&sc->sx) != 0) 644 return (EINTR); 645 CK_STAILQ_FOREACH(tlc, &sc->tlcs, link) { 646 if (tlc == ivar) { 647 mtx_lock(tlc->mtx); 648 MPASS(tlc->refcnt != 0); 649 --tlc->refcnt; 650 mtx_unlock(tlc->mtx); 651 } 652 refcnt += tlc->refcnt; 653 } 654 error = refcnt != 0 ? 0 : HID_INTR_STOP(device_get_parent(bus)); 655 sx_unlock(&sc->sx); 656 657 return (error); 658 } 659 660 void 661 hidbus_intr_poll(device_t child) 662 { 663 device_t bus = device_get_parent(child); 664 665 HID_INTR_POLL(device_get_parent(bus)); 666 } 667 668 struct hid_rdesc_info * 669 hidbus_get_rdesc_info(device_t child) 670 { 671 device_t bus = device_get_parent(child); 672 struct hidbus_softc *sc = device_get_softc(bus); 673 674 return (&sc->rdesc); 675 } 676 677 /* 678 * HID interface. 679 * 680 * Hidbus as well as any hidbus child can be passed as first arg. 681 */ 682 683 /* Read cached report descriptor */ 684 int 685 hid_get_report_descr(device_t dev, void **data, hid_size_t *len) 686 { 687 device_t bus; 688 struct hidbus_softc *sc; 689 690 bus = device_get_devclass(dev) == hidbus_devclass ? 691 dev : device_get_parent(dev); 692 sc = device_get_softc(bus); 693 694 /* 695 * Do not send request to a transport backend. 696 * Use cached report descriptor instead of it. 697 */ 698 if (sc->rdesc.data == NULL || sc->rdesc.len == 0) 699 return (ENXIO); 700 701 if (data != NULL) 702 *data = sc->rdesc.data; 703 if (len != NULL) 704 *len = sc->rdesc.len; 705 706 return (0); 707 } 708 709 /* 710 * Replace cached report descriptor with top level driver provided one. 711 * 712 * It deletes all hidbus children except caller and enumerates them again after 713 * new descriptor has been registered. Currently it can not be called from 714 * autoenumerated (by report's TLC) child device context as it results in child 715 * duplication. To overcome this limitation hid_set_report_descr() should be 716 * called from device_identify driver's handler with hidbus itself passed as 717 * 'device_t dev' parameter. 718 */ 719 int 720 hid_set_report_descr(device_t dev, const void *data, hid_size_t len) 721 { 722 struct hid_rdesc_info rdesc; 723 device_t bus; 724 struct hidbus_softc *sc; 725 bool is_bus; 726 int error; 727 728 GIANT_REQUIRED; 729 730 is_bus = device_get_devclass(dev) == hidbus_devclass; 731 bus = is_bus ? dev : device_get_parent(dev); 732 sc = device_get_softc(bus); 733 734 /* 735 * Do not overload already overloaded report descriptor in 736 * device_identify handler. It causes infinite recursion loop. 737 */ 738 if (is_bus && sc->overloaded) 739 return(0); 740 741 DPRINTFN(5, "len=%d\n", len); 742 DPRINTFN(5, "data = %*D\n", len, data, " "); 743 744 error = hidbus_fill_rdesc_info(&rdesc, data, len); 745 if (error != 0) 746 return (error); 747 748 error = hidbus_detach_children(dev); 749 if (error != 0) 750 return(error); 751 752 /* Make private copy to handle a case of dynamicaly allocated data. */ 753 rdesc.data = malloc(len, M_DEVBUF, M_ZERO | M_WAITOK); 754 bcopy(data, rdesc.data, len); 755 sc->overloaded = true; 756 free(sc->rdesc.data, M_DEVBUF); 757 bcopy(&rdesc, &sc->rdesc, sizeof(struct hid_rdesc_info)); 758 759 error = hidbus_attach_children(bus); 760 761 return (error); 762 } 763 764 static int 765 hidbus_write(device_t dev, const void *data, hid_size_t len) 766 { 767 struct hidbus_softc *sc; 768 uint8_t id; 769 770 sc = device_get_softc(dev); 771 /* 772 * Output interrupt endpoint is often optional. If HID device 773 * does not provide it, send reports via control pipe. 774 */ 775 if (sc->nowrite) { 776 /* try to extract the ID byte */ 777 id = (sc->rdesc.oid & (len > 0)) ? *(const uint8_t*)data : 0; 778 return (hid_set_report(dev, data, len, HID_OUTPUT_REPORT, id)); 779 } 780 781 return (hid_write(dev, data, len)); 782 } 783 784 /*------------------------------------------------------------------------* 785 * hidbus_lookup_id 786 * 787 * This functions takes an array of "struct hid_device_id" and tries 788 * to match the entries with the information in "struct hid_device_info". 789 * 790 * Return values: 791 * NULL: No match found. 792 * Else: Pointer to matching entry. 793 *------------------------------------------------------------------------*/ 794 const struct hid_device_id * 795 hidbus_lookup_id(device_t dev, const struct hid_device_id *id, int nitems_id) 796 { 797 const struct hid_device_id *id_end; 798 const struct hid_device_info *info; 799 int32_t usage; 800 bool is_child; 801 802 if (id == NULL) { 803 goto done; 804 } 805 806 id_end = id + nitems_id; 807 info = hid_get_device_info(dev); 808 is_child = device_get_devclass(dev) != hidbus_devclass; 809 if (is_child) 810 usage = hidbus_get_usage(dev); 811 812 /* 813 * Keep on matching array entries until we find a match or 814 * until we reach the end of the matching array: 815 */ 816 for (; id != id_end; id++) { 817 818 if (is_child && (id->match_flag_page) && 819 (id->page != HID_GET_USAGE_PAGE(usage))) { 820 continue; 821 } 822 if (is_child && (id->match_flag_usage) && 823 (id->usage != HID_GET_USAGE(usage))) { 824 continue; 825 } 826 if ((id->match_flag_bus) && 827 (id->idBus != info->idBus)) { 828 continue; 829 } 830 if ((id->match_flag_vendor) && 831 (id->idVendor != info->idVendor)) { 832 continue; 833 } 834 if ((id->match_flag_product) && 835 (id->idProduct != info->idProduct)) { 836 continue; 837 } 838 if ((id->match_flag_ver_lo) && 839 (id->idVersion_lo > info->idVersion)) { 840 continue; 841 } 842 if ((id->match_flag_ver_hi) && 843 (id->idVersion_hi < info->idVersion)) { 844 continue; 845 } 846 if (id->match_flag_pnp && 847 strncmp(id->idPnP, info->idPnP, HID_PNP_ID_SIZE) != 0) { 848 continue; 849 } 850 /* We found a match! */ 851 return (id); 852 } 853 854 done: 855 return (NULL); 856 } 857 858 /*------------------------------------------------------------------------* 859 * hidbus_lookup_driver_info - factored out code 860 * 861 * Return values: 862 * 0: Success 863 * Else: Failure 864 *------------------------------------------------------------------------*/ 865 int 866 hidbus_lookup_driver_info(device_t child, const struct hid_device_id *id, 867 int nitems_id) 868 { 869 870 id = hidbus_lookup_id(child, id, nitems_id); 871 if (id) { 872 /* copy driver info */ 873 hidbus_set_driver_info(child, id->driver_info); 874 return (0); 875 } 876 return (ENXIO); 877 } 878 879 const struct hid_device_info * 880 hid_get_device_info(device_t dev) 881 { 882 device_t bus; 883 884 bus = device_get_devclass(dev) == hidbus_devclass ? 885 dev : device_get_parent(dev); 886 887 return (device_get_ivars(bus)); 888 } 889 890 static device_method_t hidbus_methods[] = { 891 /* device interface */ 892 DEVMETHOD(device_probe, hidbus_probe), 893 DEVMETHOD(device_attach, hidbus_attach), 894 DEVMETHOD(device_detach, hidbus_detach), 895 DEVMETHOD(device_suspend, bus_generic_suspend), 896 DEVMETHOD(device_resume, bus_generic_resume), 897 898 /* bus interface */ 899 DEVMETHOD(bus_add_child, hidbus_add_child), 900 DEVMETHOD(bus_child_detached, hidbus_child_detached), 901 DEVMETHOD(bus_child_deleted, hidbus_child_deleted), 902 DEVMETHOD(bus_read_ivar, hidbus_read_ivar), 903 DEVMETHOD(bus_write_ivar, hidbus_write_ivar), 904 DEVMETHOD(bus_child_pnpinfo_str,hidbus_child_pnpinfo_str), 905 DEVMETHOD(bus_child_location_str,hidbus_child_location_str), 906 907 /* hid interface */ 908 DEVMETHOD(hid_get_rdesc, hid_get_rdesc), 909 DEVMETHOD(hid_read, hid_read), 910 DEVMETHOD(hid_write, hidbus_write), 911 DEVMETHOD(hid_get_report, hid_get_report), 912 DEVMETHOD(hid_set_report, hid_set_report), 913 DEVMETHOD(hid_set_idle, hid_set_idle), 914 DEVMETHOD(hid_set_protocol, hid_set_protocol), 915 916 DEVMETHOD_END 917 }; 918 919 devclass_t hidbus_devclass; 920 driver_t hidbus_driver = { 921 "hidbus", 922 hidbus_methods, 923 sizeof(struct hidbus_softc), 924 }; 925 926 MODULE_DEPEND(hidbus, hid, 1, 1, 1); 927 MODULE_VERSION(hidbus, 1); 928 DRIVER_MODULE(hidbus, iichid, hidbus_driver, hidbus_devclass, 0, 0); 929 DRIVER_MODULE(hidbus, usbhid, hidbus_driver, hidbus_devclass, 0, 0);
Cache object: c6476f49b818b3f784f0e155f1b4eef3
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