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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/sbuf.h> 44 #include <sys/sx.h> 45 #include <sys/systm.h> 46 47 #define HID_DEBUG_VAR hid_debug 48 #include <dev/hid/hid.h> 49 #include <dev/hid/hidbus.h> 50 #include <dev/hid/hidquirk.h> 51 52 #include "hid_if.h" 53 54 #define INPUT_EPOCH global_epoch_preempt 55 #define HID_RSIZE_MAX 1024 56 57 static hid_intr_t hidbus_intr; 58 59 static device_probe_t hidbus_probe; 60 static device_attach_t hidbus_attach; 61 static device_detach_t hidbus_detach; 62 63 struct hidbus_ivars { 64 int32_t usage; 65 uint8_t index; 66 uint32_t flags; 67 uintptr_t driver_info; /* for internal use */ 68 struct mtx *mtx; /* child intr mtx */ 69 hid_intr_t *intr_handler; /* executed under mtx*/ 70 void *intr_ctx; 71 unsigned int refcnt; /* protected by mtx */ 72 struct epoch_context epoch_ctx; 73 CK_STAILQ_ENTRY(hidbus_ivars) link; 74 }; 75 76 struct hidbus_softc { 77 device_t dev; 78 struct sx sx; 79 struct mtx mtx; 80 81 bool nowrite; 82 83 struct hid_rdesc_info rdesc; 84 bool overloaded; 85 int nest; /* Child attach nesting lvl */ 86 int nauto; /* Number of autochildren */ 87 88 CK_STAILQ_HEAD(, hidbus_ivars) tlcs; 89 }; 90 91 static int 92 hidbus_fill_rdesc_info(struct hid_rdesc_info *hri, const void *data, 93 hid_size_t len) 94 { 95 int error = 0; 96 97 hri->data = __DECONST(void *, data); 98 hri->len = len; 99 100 /* 101 * If report descriptor is not available yet, set maximal 102 * report sizes high enough to allow hidraw to work. 103 */ 104 hri->isize = len == 0 ? HID_RSIZE_MAX : 105 hid_report_size_max(data, len, hid_input, &hri->iid); 106 hri->osize = len == 0 ? HID_RSIZE_MAX : 107 hid_report_size_max(data, len, hid_output, &hri->oid); 108 hri->fsize = len == 0 ? HID_RSIZE_MAX : 109 hid_report_size_max(data, len, hid_feature, &hri->fid); 110 111 if (hri->isize > HID_RSIZE_MAX) { 112 DPRINTF("input size is too large, %u bytes (truncating)\n", 113 hri->isize); 114 hri->isize = HID_RSIZE_MAX; 115 error = EOVERFLOW; 116 } 117 if (hri->osize > HID_RSIZE_MAX) { 118 DPRINTF("output size is too large, %u bytes (truncating)\n", 119 hri->osize); 120 hri->osize = HID_RSIZE_MAX; 121 error = EOVERFLOW; 122 } 123 if (hri->fsize > HID_RSIZE_MAX) { 124 DPRINTF("feature size is too large, %u bytes (truncating)\n", 125 hri->fsize); 126 hri->fsize = HID_RSIZE_MAX; 127 error = EOVERFLOW; 128 } 129 130 return (error); 131 } 132 133 int 134 hidbus_locate(const void *desc, hid_size_t size, int32_t u, enum hid_kind k, 135 uint8_t tlc_index, uint8_t index, struct hid_location *loc, 136 uint32_t *flags, uint8_t *id, struct hid_absinfo *ai) 137 { 138 struct hid_data *d; 139 struct hid_item h; 140 int i; 141 142 d = hid_start_parse(desc, size, 1 << k); 143 HIDBUS_FOREACH_ITEM(d, &h, tlc_index) { 144 for (i = 0; i < h.nusages; i++) { 145 if (h.kind == k && h.usages[i] == u) { 146 if (index--) 147 break; 148 if (loc != NULL) 149 *loc = h.loc; 150 if (flags != NULL) 151 *flags = h.flags; 152 if (id != NULL) 153 *id = h.report_ID; 154 if (ai != NULL && (h.flags&HIO_RELATIVE) == 0) 155 *ai = (struct hid_absinfo) { 156 .max = h.logical_maximum, 157 .min = h.logical_minimum, 158 .res = hid_item_resolution(&h), 159 }; 160 hid_end_parse(d); 161 return (1); 162 } 163 } 164 } 165 if (loc != NULL) 166 loc->size = 0; 167 if (flags != NULL) 168 *flags = 0; 169 if (id != NULL) 170 *id = 0; 171 hid_end_parse(d); 172 return (0); 173 } 174 175 bool 176 hidbus_is_collection(const void *desc, hid_size_t size, int32_t usage, 177 uint8_t tlc_index) 178 { 179 struct hid_data *d; 180 struct hid_item h; 181 bool ret = false; 182 183 d = hid_start_parse(desc, size, 0); 184 HIDBUS_FOREACH_ITEM(d, &h, tlc_index) { 185 if (h.kind == hid_collection && h.usage == usage) { 186 ret = true; 187 break; 188 } 189 } 190 hid_end_parse(d); 191 return (ret); 192 } 193 194 static device_t 195 hidbus_add_child(device_t dev, u_int order, const char *name, int unit) 196 { 197 struct hidbus_softc *sc = device_get_softc(dev); 198 struct hidbus_ivars *tlc; 199 device_t child; 200 201 child = device_add_child_ordered(dev, order, name, unit); 202 if (child == NULL) 203 return (child); 204 205 tlc = malloc(sizeof(struct hidbus_ivars), M_DEVBUF, M_WAITOK | M_ZERO); 206 tlc->mtx = &sc->mtx; 207 device_set_ivars(child, tlc); 208 sx_xlock(&sc->sx); 209 CK_STAILQ_INSERT_TAIL(&sc->tlcs, tlc, link); 210 sx_unlock(&sc->sx); 211 212 return (child); 213 } 214 215 static int 216 hidbus_enumerate_children(device_t dev, const void* data, hid_size_t len) 217 { 218 struct hidbus_softc *sc = device_get_softc(dev); 219 struct hid_data *hd; 220 struct hid_item hi; 221 device_t child; 222 uint8_t index = 0; 223 224 if (data == NULL || len == 0) 225 return (ENXIO); 226 227 /* Add a child for each top level collection */ 228 hd = hid_start_parse(data, len, 1 << hid_input); 229 while (hid_get_item(hd, &hi)) { 230 if (hi.kind != hid_collection || hi.collevel != 1) 231 continue; 232 child = BUS_ADD_CHILD(dev, 0, NULL, -1); 233 if (child == NULL) { 234 device_printf(dev, "Could not add HID device\n"); 235 continue; 236 } 237 hidbus_set_index(child, index); 238 hidbus_set_usage(child, hi.usage); 239 hidbus_set_flags(child, HIDBUS_FLAG_AUTOCHILD); 240 index++; 241 DPRINTF("Add child TLC: 0x%04x:0x%04x\n", 242 HID_GET_USAGE_PAGE(hi.usage), HID_GET_USAGE(hi.usage)); 243 } 244 hid_end_parse(hd); 245 246 if (index == 0) 247 return (ENXIO); 248 249 sc->nauto = index; 250 251 return (0); 252 } 253 254 static int 255 hidbus_attach_children(device_t dev) 256 { 257 struct hidbus_softc *sc = device_get_softc(dev); 258 int error; 259 260 HID_INTR_SETUP(device_get_parent(dev), hidbus_intr, sc, &sc->rdesc); 261 262 error = hidbus_enumerate_children(dev, sc->rdesc.data, sc->rdesc.len); 263 if (error != 0) 264 DPRINTF("failed to enumerate children: error %d\n", error); 265 266 /* 267 * hidbus_attach_children() can recurse through device_identify-> 268 * hid_set_report_descr() call sequence. Do not perform children 269 * attach twice in that case. 270 */ 271 sc->nest++; 272 bus_generic_probe(dev); 273 sc->nest--; 274 if (sc->nest != 0) 275 return (0); 276 277 if (hid_is_keyboard(sc->rdesc.data, sc->rdesc.len) != 0) 278 error = bus_generic_attach(dev); 279 else 280 error = bus_delayed_attach_children(dev); 281 if (error != 0) 282 device_printf(dev, "failed to attach child: error %d\n", error); 283 284 return (error); 285 } 286 287 static int 288 hidbus_detach_children(device_t dev) 289 { 290 device_t *children, bus; 291 bool is_bus; 292 int i, error; 293 294 error = 0; 295 296 is_bus = device_get_devclass(dev) == devclass_find("hidbus"); 297 bus = is_bus ? dev : device_get_parent(dev); 298 299 KASSERT(device_get_devclass(bus) == devclass_find("hidbus"), 300 ("Device is not hidbus or it's child")); 301 302 if (is_bus) { 303 /* If hidbus is passed, delete all children. */ 304 bus_generic_detach(bus); 305 device_delete_children(bus); 306 } else { 307 /* 308 * If hidbus child is passed, delete all hidbus children 309 * except caller. Deleting the caller may result in deadlock. 310 */ 311 error = device_get_children(bus, &children, &i); 312 if (error != 0) 313 return (error); 314 while (i-- > 0) { 315 if (children[i] == dev) 316 continue; 317 DPRINTF("Delete child. index=%d (%s)\n", 318 hidbus_get_index(children[i]), 319 device_get_nameunit(children[i])); 320 error = device_delete_child(bus, children[i]); 321 if (error) { 322 DPRINTF("Failed deleting %s\n", 323 device_get_nameunit(children[i])); 324 break; 325 } 326 } 327 free(children, M_TEMP); 328 } 329 330 HID_INTR_UNSETUP(device_get_parent(bus)); 331 332 return (error); 333 } 334 335 static int 336 hidbus_probe(device_t dev) 337 { 338 339 device_set_desc(dev, "HID bus"); 340 341 /* Allow other subclasses to override this driver. */ 342 return (BUS_PROBE_GENERIC); 343 } 344 345 static int 346 hidbus_attach(device_t dev) 347 { 348 struct hidbus_softc *sc = device_get_softc(dev); 349 struct hid_device_info *devinfo = device_get_ivars(dev); 350 void *d_ptr = NULL; 351 hid_size_t d_len; 352 int error; 353 354 sc->dev = dev; 355 CK_STAILQ_INIT(&sc->tlcs); 356 mtx_init(&sc->mtx, "hidbus ivar lock", NULL, MTX_DEF); 357 sx_init(&sc->sx, "hidbus ivar list lock"); 358 359 /* 360 * Ignore error. It is possible for non-HID device e.g. XBox360 gamepad 361 * to emulate HID through overloading of report descriptor. 362 */ 363 d_len = devinfo->rdescsize; 364 if (d_len != 0) { 365 d_ptr = malloc(d_len, M_DEVBUF, M_ZERO | M_WAITOK); 366 error = hid_get_rdesc(dev, d_ptr, d_len); 367 if (error != 0) { 368 free(d_ptr, M_DEVBUF); 369 d_len = 0; 370 d_ptr = NULL; 371 } 372 } 373 374 hidbus_fill_rdesc_info(&sc->rdesc, d_ptr, d_len); 375 376 sc->nowrite = hid_test_quirk(devinfo, HQ_NOWRITE); 377 378 error = hidbus_attach_children(dev); 379 if (error != 0) { 380 hidbus_detach(dev); 381 return (ENXIO); 382 } 383 384 return (0); 385 } 386 387 static int 388 hidbus_detach(device_t dev) 389 { 390 struct hidbus_softc *sc = device_get_softc(dev); 391 392 hidbus_detach_children(dev); 393 sx_destroy(&sc->sx); 394 mtx_destroy(&sc->mtx); 395 free(sc->rdesc.data, M_DEVBUF); 396 397 return (0); 398 } 399 400 static void 401 hidbus_child_detached(device_t bus, device_t child) 402 { 403 struct hidbus_softc *sc = device_get_softc(bus); 404 struct hidbus_ivars *tlc = device_get_ivars(child); 405 406 KASSERT(tlc->refcnt == 0, ("Child device is running")); 407 tlc->mtx = &sc->mtx; 408 tlc->intr_handler = NULL; 409 tlc->flags &= ~HIDBUS_FLAG_CAN_POLL; 410 } 411 412 /* 413 * Epoch callback indicating tlc is safe to destroy 414 */ 415 static void 416 hidbus_ivar_dtor(epoch_context_t ctx) 417 { 418 struct hidbus_ivars *tlc; 419 420 tlc = __containerof(ctx, struct hidbus_ivars, epoch_ctx); 421 free(tlc, M_DEVBUF); 422 } 423 424 static void 425 hidbus_child_deleted(device_t bus, device_t child) 426 { 427 struct hidbus_softc *sc = device_get_softc(bus); 428 struct hidbus_ivars *tlc = device_get_ivars(child); 429 430 sx_xlock(&sc->sx); 431 KASSERT(tlc->refcnt == 0, ("Child device is running")); 432 CK_STAILQ_REMOVE(&sc->tlcs, tlc, hidbus_ivars, link); 433 sx_unlock(&sc->sx); 434 epoch_call(INPUT_EPOCH, hidbus_ivar_dtor, &tlc->epoch_ctx); 435 } 436 437 static int 438 hidbus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result) 439 { 440 struct hidbus_softc *sc = device_get_softc(bus); 441 struct hidbus_ivars *tlc = device_get_ivars(child); 442 443 switch (which) { 444 case HIDBUS_IVAR_INDEX: 445 *result = tlc->index; 446 break; 447 case HIDBUS_IVAR_USAGE: 448 *result = tlc->usage; 449 break; 450 case HIDBUS_IVAR_FLAGS: 451 *result = tlc->flags; 452 break; 453 case HIDBUS_IVAR_DRIVER_INFO: 454 *result = tlc->driver_info; 455 break; 456 case HIDBUS_IVAR_LOCK: 457 *result = (uintptr_t)(tlc->mtx == &sc->mtx ? NULL : tlc->mtx); 458 break; 459 default: 460 return (EINVAL); 461 } 462 return (0); 463 } 464 465 static int 466 hidbus_write_ivar(device_t bus, device_t child, int which, uintptr_t value) 467 { 468 struct hidbus_softc *sc = device_get_softc(bus); 469 struct hidbus_ivars *tlc = device_get_ivars(child); 470 471 switch (which) { 472 case HIDBUS_IVAR_INDEX: 473 tlc->index = value; 474 break; 475 case HIDBUS_IVAR_USAGE: 476 tlc->usage = value; 477 break; 478 case HIDBUS_IVAR_FLAGS: 479 tlc->flags = value; 480 if ((value & HIDBUS_FLAG_CAN_POLL) != 0) 481 HID_INTR_SETUP( 482 device_get_parent(bus), NULL, NULL, NULL); 483 break; 484 case HIDBUS_IVAR_DRIVER_INFO: 485 tlc->driver_info = value; 486 break; 487 case HIDBUS_IVAR_LOCK: 488 tlc->mtx = (struct mtx *)value == NULL ? 489 &sc->mtx : (struct mtx *)value; 490 break; 491 default: 492 return (EINVAL); 493 } 494 return (0); 495 } 496 497 /* Location hint for devctl(8) */ 498 static int 499 hidbus_child_location(device_t bus, device_t child, struct sbuf *sb) 500 { 501 struct hidbus_ivars *tlc = device_get_ivars(child); 502 503 sbuf_printf(sb, "index=%hhu", tlc->index); 504 return (0); 505 } 506 507 /* PnP information for devctl(8) */ 508 static int 509 hidbus_child_pnpinfo(device_t bus, device_t child, struct sbuf *sb) 510 { 511 struct hidbus_ivars *tlc = device_get_ivars(child); 512 struct hid_device_info *devinfo = device_get_ivars(bus); 513 514 sbuf_printf(sb, "page=0x%04x usage=0x%04x bus=0x%02hx " 515 "vendor=0x%04hx product=0x%04hx version=0x%04hx%s%s", 516 HID_GET_USAGE_PAGE(tlc->usage), HID_GET_USAGE(tlc->usage), 517 devinfo->idBus, devinfo->idVendor, devinfo->idProduct, 518 devinfo->idVersion, devinfo->idPnP[0] == '\0' ? "" : " _HID=", 519 devinfo->idPnP[0] == '\0' ? "" : devinfo->idPnP); 520 return (0); 521 } 522 523 void 524 hidbus_set_desc(device_t child, const char *suffix) 525 { 526 device_t bus = device_get_parent(child); 527 struct hidbus_softc *sc = device_get_softc(bus); 528 struct hid_device_info *devinfo = device_get_ivars(bus); 529 struct hidbus_ivars *tlc = device_get_ivars(child); 530 char buf[80]; 531 532 /* Do not add NULL suffix or if device name already contains it. */ 533 if (suffix != NULL && strcasestr(devinfo->name, suffix) == NULL && 534 (sc->nauto > 1 || (tlc->flags & HIDBUS_FLAG_AUTOCHILD) == 0)) { 535 snprintf(buf, sizeof(buf), "%s %s", devinfo->name, suffix); 536 device_set_desc_copy(child, buf); 537 } else 538 device_set_desc(child, devinfo->name); 539 } 540 541 device_t 542 hidbus_find_child(device_t bus, int32_t usage) 543 { 544 device_t *children, child; 545 int ccount, i; 546 547 bus_topo_assert(); 548 549 /* Get a list of all hidbus children */ 550 if (device_get_children(bus, &children, &ccount) != 0) 551 return (NULL); 552 553 /* Scan through to find required TLC */ 554 for (i = 0, child = NULL; i < ccount; i++) { 555 if (hidbus_get_usage(children[i]) == usage) { 556 child = children[i]; 557 break; 558 } 559 } 560 free(children, M_TEMP); 561 562 return (child); 563 } 564 565 void 566 hidbus_intr(void *context, void *buf, hid_size_t len) 567 { 568 struct hidbus_softc *sc = context; 569 struct hidbus_ivars *tlc; 570 struct epoch_tracker et; 571 572 /* 573 * Broadcast input report to all subscribers. 574 * TODO: Add check for input report ID. 575 * 576 * Relock mutex on every TLC item as we can't hold any locks over whole 577 * TLC list here due to LOR with open()/close() handlers. 578 */ 579 if (!HID_IN_POLLING_MODE()) 580 epoch_enter_preempt(INPUT_EPOCH, &et); 581 CK_STAILQ_FOREACH(tlc, &sc->tlcs, link) { 582 if (tlc->refcnt == 0 || tlc->intr_handler == NULL) 583 continue; 584 if (HID_IN_POLLING_MODE()) { 585 if ((tlc->flags & HIDBUS_FLAG_CAN_POLL) != 0) 586 tlc->intr_handler(tlc->intr_ctx, buf, len); 587 } else { 588 mtx_lock(tlc->mtx); 589 tlc->intr_handler(tlc->intr_ctx, buf, len); 590 mtx_unlock(tlc->mtx); 591 } 592 } 593 if (!HID_IN_POLLING_MODE()) 594 epoch_exit_preempt(INPUT_EPOCH, &et); 595 } 596 597 void 598 hidbus_set_intr(device_t child, hid_intr_t *handler, void *context) 599 { 600 struct hidbus_ivars *tlc = device_get_ivars(child); 601 602 tlc->intr_handler = handler; 603 tlc->intr_ctx = context; 604 } 605 606 int 607 hidbus_intr_start(device_t child) 608 { 609 device_t bus = device_get_parent(child); 610 struct hidbus_softc *sc = device_get_softc(bus); 611 struct hidbus_ivars *ivar = device_get_ivars(child); 612 struct hidbus_ivars *tlc; 613 bool refcnted = false; 614 int error; 615 616 if (sx_xlock_sig(&sc->sx) != 0) 617 return (EINTR); 618 CK_STAILQ_FOREACH(tlc, &sc->tlcs, link) { 619 refcnted |= (tlc->refcnt != 0); 620 if (tlc == ivar) { 621 mtx_lock(tlc->mtx); 622 ++tlc->refcnt; 623 mtx_unlock(tlc->mtx); 624 } 625 } 626 error = refcnted ? 0 : HID_INTR_START(device_get_parent(bus)); 627 sx_unlock(&sc->sx); 628 629 return (error); 630 } 631 632 int 633 hidbus_intr_stop(device_t child) 634 { 635 device_t bus = device_get_parent(child); 636 struct hidbus_softc *sc = device_get_softc(bus); 637 struct hidbus_ivars *ivar = device_get_ivars(child); 638 struct hidbus_ivars *tlc; 639 bool refcnted = false; 640 int error; 641 642 if (sx_xlock_sig(&sc->sx) != 0) 643 return (EINTR); 644 CK_STAILQ_FOREACH(tlc, &sc->tlcs, link) { 645 if (tlc == ivar) { 646 mtx_lock(tlc->mtx); 647 MPASS(tlc->refcnt != 0); 648 --tlc->refcnt; 649 mtx_unlock(tlc->mtx); 650 } 651 refcnted |= (tlc->refcnt != 0); 652 } 653 error = refcnted ? 0 : HID_INTR_STOP(device_get_parent(bus)); 654 sx_unlock(&sc->sx); 655 656 return (error); 657 } 658 659 void 660 hidbus_intr_poll(device_t child) 661 { 662 device_t bus = device_get_parent(child); 663 664 HID_INTR_POLL(device_get_parent(bus)); 665 } 666 667 struct hid_rdesc_info * 668 hidbus_get_rdesc_info(device_t child) 669 { 670 device_t bus = device_get_parent(child); 671 struct hidbus_softc *sc = device_get_softc(bus); 672 673 return (&sc->rdesc); 674 } 675 676 /* 677 * HID interface. 678 * 679 * Hidbus as well as any hidbus child can be passed as first arg. 680 */ 681 682 /* Read cached report descriptor */ 683 int 684 hid_get_report_descr(device_t dev, void **data, hid_size_t *len) 685 { 686 device_t bus; 687 struct hidbus_softc *sc; 688 689 bus = device_get_devclass(dev) == devclass_find("hidbus") ? 690 dev : device_get_parent(dev); 691 sc = device_get_softc(bus); 692 693 /* 694 * Do not send request to a transport backend. 695 * Use cached report descriptor instead of it. 696 */ 697 if (sc->rdesc.data == NULL || sc->rdesc.len == 0) 698 return (ENXIO); 699 700 if (data != NULL) 701 *data = sc->rdesc.data; 702 if (len != NULL) 703 *len = sc->rdesc.len; 704 705 return (0); 706 } 707 708 /* 709 * Replace cached report descriptor with top level driver provided one. 710 * 711 * It deletes all hidbus children except caller and enumerates them again after 712 * new descriptor has been registered. Currently it can not be called from 713 * autoenumerated (by report's TLC) child device context as it results in child 714 * duplication. To overcome this limitation hid_set_report_descr() should be 715 * called from device_identify driver's handler with hidbus itself passed as 716 * 'device_t dev' parameter. 717 */ 718 int 719 hid_set_report_descr(device_t dev, const void *data, hid_size_t len) 720 { 721 struct hid_rdesc_info rdesc; 722 device_t bus; 723 struct hidbus_softc *sc; 724 bool is_bus; 725 int error; 726 727 bus_topo_assert(); 728 729 is_bus = device_get_devclass(dev) == devclass_find("hidbus"); 730 bus = is_bus ? dev : device_get_parent(dev); 731 sc = device_get_softc(bus); 732 733 /* 734 * Do not overload already overloaded report descriptor in 735 * device_identify handler. It causes infinite recursion loop. 736 */ 737 if (is_bus && sc->overloaded) 738 return(0); 739 740 DPRINTFN(5, "len=%d\n", len); 741 DPRINTFN(5, "data = %*D\n", len, data, " "); 742 743 error = hidbus_fill_rdesc_info(&rdesc, data, len); 744 if (error != 0) 745 return (error); 746 747 error = hidbus_detach_children(dev); 748 if (error != 0) 749 return(error); 750 751 /* Make private copy to handle a case of dynamicaly allocated data. */ 752 rdesc.data = malloc(len, M_DEVBUF, M_ZERO | M_WAITOK); 753 bcopy(data, rdesc.data, len); 754 sc->overloaded = true; 755 free(sc->rdesc.data, M_DEVBUF); 756 bcopy(&rdesc, &sc->rdesc, sizeof(struct hid_rdesc_info)); 757 758 error = hidbus_attach_children(bus); 759 760 return (error); 761 } 762 763 static int 764 hidbus_write(device_t dev, const void *data, hid_size_t len) 765 { 766 struct hidbus_softc *sc; 767 uint8_t id; 768 769 sc = device_get_softc(dev); 770 /* 771 * Output interrupt endpoint is often optional. If HID device 772 * does not provide it, send reports via control pipe. 773 */ 774 if (sc->nowrite) { 775 /* try to extract the ID byte */ 776 id = (sc->rdesc.oid & (len > 0)) ? *(const uint8_t*)data : 0; 777 return (hid_set_report(dev, data, len, HID_OUTPUT_REPORT, id)); 778 } 779 780 return (hid_write(dev, data, len)); 781 } 782 783 /*------------------------------------------------------------------------* 784 * hidbus_lookup_id 785 * 786 * This functions takes an array of "struct hid_device_id" and tries 787 * to match the entries with the information in "struct hid_device_info". 788 * 789 * Return values: 790 * NULL: No match found. 791 * Else: Pointer to matching entry. 792 *------------------------------------------------------------------------*/ 793 const struct hid_device_id * 794 hidbus_lookup_id(device_t dev, const struct hid_device_id *id, int nitems_id) 795 { 796 const struct hid_device_id *id_end; 797 const struct hid_device_info *info; 798 int32_t usage; 799 bool is_child; 800 801 if (id == NULL) { 802 goto done; 803 } 804 805 id_end = id + nitems_id; 806 info = hid_get_device_info(dev); 807 is_child = device_get_devclass(dev) != devclass_find("hidbus"); 808 if (is_child) 809 usage = hidbus_get_usage(dev); 810 811 /* 812 * Keep on matching array entries until we find a match or 813 * until we reach the end of the matching array: 814 */ 815 for (; id != id_end; id++) { 816 817 if (is_child && (id->match_flag_page) && 818 (id->page != HID_GET_USAGE_PAGE(usage))) { 819 continue; 820 } 821 if (is_child && (id->match_flag_usage) && 822 (id->usage != HID_GET_USAGE(usage))) { 823 continue; 824 } 825 if ((id->match_flag_bus) && 826 (id->idBus != info->idBus)) { 827 continue; 828 } 829 if ((id->match_flag_vendor) && 830 (id->idVendor != info->idVendor)) { 831 continue; 832 } 833 if ((id->match_flag_product) && 834 (id->idProduct != info->idProduct)) { 835 continue; 836 } 837 if ((id->match_flag_ver_lo) && 838 (id->idVersion_lo > info->idVersion)) { 839 continue; 840 } 841 if ((id->match_flag_ver_hi) && 842 (id->idVersion_hi < info->idVersion)) { 843 continue; 844 } 845 if (id->match_flag_pnp && 846 strncmp(id->idPnP, info->idPnP, HID_PNP_ID_SIZE) != 0) { 847 continue; 848 } 849 /* We found a match! */ 850 return (id); 851 } 852 853 done: 854 return (NULL); 855 } 856 857 /*------------------------------------------------------------------------* 858 * hidbus_lookup_driver_info - factored out code 859 * 860 * Return values: 861 * 0: Success 862 * Else: Failure 863 *------------------------------------------------------------------------*/ 864 int 865 hidbus_lookup_driver_info(device_t child, const struct hid_device_id *id, 866 int nitems_id) 867 { 868 869 id = hidbus_lookup_id(child, id, nitems_id); 870 if (id) { 871 /* copy driver info */ 872 hidbus_set_driver_info(child, id->driver_info); 873 return (0); 874 } 875 return (ENXIO); 876 } 877 878 const struct hid_device_info * 879 hid_get_device_info(device_t dev) 880 { 881 device_t bus; 882 883 bus = device_get_devclass(dev) == devclass_find("hidbus") ? 884 dev : device_get_parent(dev); 885 886 return (device_get_ivars(bus)); 887 } 888 889 static device_method_t hidbus_methods[] = { 890 /* device interface */ 891 DEVMETHOD(device_probe, hidbus_probe), 892 DEVMETHOD(device_attach, hidbus_attach), 893 DEVMETHOD(device_detach, hidbus_detach), 894 DEVMETHOD(device_suspend, bus_generic_suspend), 895 DEVMETHOD(device_resume, bus_generic_resume), 896 897 /* bus interface */ 898 DEVMETHOD(bus_add_child, hidbus_add_child), 899 DEVMETHOD(bus_child_detached, hidbus_child_detached), 900 DEVMETHOD(bus_child_deleted, hidbus_child_deleted), 901 DEVMETHOD(bus_read_ivar, hidbus_read_ivar), 902 DEVMETHOD(bus_write_ivar, hidbus_write_ivar), 903 DEVMETHOD(bus_child_pnpinfo, hidbus_child_pnpinfo), 904 DEVMETHOD(bus_child_location, hidbus_child_location), 905 906 /* hid interface */ 907 DEVMETHOD(hid_get_rdesc, hid_get_rdesc), 908 DEVMETHOD(hid_read, hid_read), 909 DEVMETHOD(hid_write, hidbus_write), 910 DEVMETHOD(hid_get_report, hid_get_report), 911 DEVMETHOD(hid_set_report, hid_set_report), 912 DEVMETHOD(hid_set_idle, hid_set_idle), 913 DEVMETHOD(hid_set_protocol, hid_set_protocol), 914 DEVMETHOD(hid_ioctl, hid_ioctl), 915 916 DEVMETHOD_END 917 }; 918 919 driver_t hidbus_driver = { 920 "hidbus", 921 hidbus_methods, 922 sizeof(struct hidbus_softc), 923 }; 924 925 MODULE_DEPEND(hidbus, hid, 1, 1, 1); 926 MODULE_VERSION(hidbus, 1); 927 DRIVER_MODULE(hidbus, iichid, hidbus_driver, 0, 0); 928 DRIVER_MODULE(hidbus, usbhid, hidbus_driver, 0, 0);
Cache object: 483b5bca0199b469f86f2e4ee9595daa
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