1 /* $FreeBSD$ */ 2 /*- 3 * Copyright (c) 2009 Sylvestre Gallon. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/queue.h> 28 29 #include <errno.h> 30 #include <poll.h> 31 #include <pthread.h> 32 #include <stdio.h> 33 #include <stdlib.h> 34 #include <time.h> 35 #include <unistd.h> 36 37 #define libusb_device_handle libusb20_device 38 39 #include "libusb20.h" 40 #include "libusb20_desc.h" 41 #include "libusb20_int.h" 42 #include "libusb.h" 43 #include "libusb10.h" 44 45 UNEXPORTED void 46 libusb10_add_pollfd(libusb_context *ctx, struct libusb_super_pollfd *pollfd, 47 struct libusb20_device *pdev, int fd, short events) 48 { 49 if (ctx == NULL) 50 return; /* invalid */ 51 52 if (pollfd->entry.tqe_prev != NULL) 53 return; /* already queued */ 54 55 if (fd < 0) 56 return; /* invalid */ 57 58 pollfd->pdev = pdev; 59 pollfd->pollfd.fd = fd; 60 pollfd->pollfd.events = events; 61 62 CTX_LOCK(ctx); 63 TAILQ_INSERT_TAIL(&ctx->pollfds, pollfd, entry); 64 CTX_UNLOCK(ctx); 65 66 if (ctx->fd_added_cb) 67 ctx->fd_added_cb(fd, events, ctx->fd_cb_user_data); 68 } 69 70 UNEXPORTED void 71 libusb10_remove_pollfd(libusb_context *ctx, struct libusb_super_pollfd *pollfd) 72 { 73 if (ctx == NULL) 74 return; /* invalid */ 75 76 if (pollfd->entry.tqe_prev == NULL) 77 return; /* already dequeued */ 78 79 CTX_LOCK(ctx); 80 TAILQ_REMOVE(&ctx->pollfds, pollfd, entry); 81 pollfd->entry.tqe_prev = NULL; 82 CTX_UNLOCK(ctx); 83 84 if (ctx->fd_removed_cb) 85 ctx->fd_removed_cb(pollfd->pollfd.fd, ctx->fd_cb_user_data); 86 } 87 88 /* This function must be called locked */ 89 90 static int 91 libusb10_handle_events_sub(struct libusb_context *ctx, struct timeval *tv) 92 { 93 struct libusb_device *dev; 94 struct libusb20_device **ppdev; 95 struct libusb_super_pollfd *pfd; 96 struct pollfd *fds; 97 struct libusb_super_transfer *sxfer; 98 struct libusb_transfer *uxfer; 99 nfds_t nfds; 100 int timeout; 101 int i; 102 int err; 103 104 DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb10_handle_events_sub enter"); 105 106 nfds = 0; 107 i = 0; 108 TAILQ_FOREACH(pfd, &ctx->pollfds, entry) 109 nfds++; 110 111 fds = alloca(sizeof(*fds) * nfds); 112 if (fds == NULL) 113 return (LIBUSB_ERROR_NO_MEM); 114 115 ppdev = alloca(sizeof(*ppdev) * nfds); 116 if (ppdev == NULL) 117 return (LIBUSB_ERROR_NO_MEM); 118 119 TAILQ_FOREACH(pfd, &ctx->pollfds, entry) { 120 fds[i].fd = pfd->pollfd.fd; 121 fds[i].events = pfd->pollfd.events; 122 fds[i].revents = 0; 123 ppdev[i] = pfd->pdev; 124 if (pfd->pdev != NULL) 125 libusb_get_device(pfd->pdev)->refcnt++; 126 i++; 127 } 128 129 if (tv == NULL) 130 timeout = -1; 131 else 132 timeout = (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000); 133 134 CTX_UNLOCK(ctx); 135 err = poll(fds, nfds, timeout); 136 CTX_LOCK(ctx); 137 138 if ((err == -1) && (errno == EINTR)) 139 err = LIBUSB_ERROR_INTERRUPTED; 140 else if (err < 0) 141 err = LIBUSB_ERROR_IO; 142 143 if (err < 1) { 144 for (i = 0; i != (int)nfds; i++) { 145 if (ppdev[i] != NULL) { 146 CTX_UNLOCK(ctx); 147 libusb_unref_device(libusb_get_device(ppdev[i])); 148 CTX_LOCK(ctx); 149 } 150 } 151 goto do_done; 152 } 153 for (i = 0; i != (int)nfds; i++) { 154 if (ppdev[i] != NULL) { 155 dev = libusb_get_device(ppdev[i]); 156 157 if (fds[i].revents == 0) 158 err = 0; /* nothing to do */ 159 else 160 err = libusb20_dev_process(ppdev[i]); 161 162 if (err) { 163 /* cancel all transfers - device is gone */ 164 libusb10_cancel_all_transfer(dev); 165 166 /* remove USB device from polling loop */ 167 libusb10_remove_pollfd(dev->ctx, &dev->dev_poll); 168 } 169 CTX_UNLOCK(ctx); 170 libusb_unref_device(dev); 171 CTX_LOCK(ctx); 172 173 } else { 174 uint8_t dummy; 175 176 while (1) { 177 if (read(fds[i].fd, &dummy, 1) != 1) 178 break; 179 } 180 } 181 } 182 183 err = 0; 184 185 do_done: 186 187 /* Do all done callbacks */ 188 189 while ((sxfer = TAILQ_FIRST(&ctx->tr_done))) { 190 uint8_t flags; 191 192 TAILQ_REMOVE(&ctx->tr_done, sxfer, entry); 193 sxfer->entry.tqe_prev = NULL; 194 195 ctx->tr_done_ref++; 196 197 CTX_UNLOCK(ctx); 198 199 uxfer = (struct libusb_transfer *)( 200 ((uint8_t *)sxfer) + sizeof(*sxfer)); 201 202 /* Allow the callback to free the transfer itself. */ 203 flags = uxfer->flags; 204 205 if (uxfer->callback != NULL) 206 (uxfer->callback) (uxfer); 207 208 /* Check if the USB transfer should be automatically freed. */ 209 if (flags & LIBUSB_TRANSFER_FREE_TRANSFER) 210 libusb_free_transfer(uxfer); 211 212 CTX_LOCK(ctx); 213 214 ctx->tr_done_ref--; 215 ctx->tr_done_gen++; 216 } 217 218 /* Wakeup other waiters */ 219 pthread_cond_broadcast(&ctx->ctx_cond); 220 221 return (err); 222 } 223 224 /* Polling and timing */ 225 226 int 227 libusb_try_lock_events(libusb_context *ctx) 228 { 229 int err; 230 231 ctx = GET_CONTEXT(ctx); 232 if (ctx == NULL) 233 return (1); 234 235 err = CTX_TRYLOCK(ctx); 236 if (err) 237 return (1); 238 239 err = (ctx->ctx_handler != NO_THREAD); 240 if (err) 241 CTX_UNLOCK(ctx); 242 else 243 ctx->ctx_handler = pthread_self(); 244 245 return (err); 246 } 247 248 void 249 libusb_lock_events(libusb_context *ctx) 250 { 251 ctx = GET_CONTEXT(ctx); 252 CTX_LOCK(ctx); 253 if (ctx->ctx_handler == NO_THREAD) 254 ctx->ctx_handler = pthread_self(); 255 } 256 257 void 258 libusb_unlock_events(libusb_context *ctx) 259 { 260 ctx = GET_CONTEXT(ctx); 261 if (ctx->ctx_handler == pthread_self()) { 262 ctx->ctx_handler = NO_THREAD; 263 pthread_cond_broadcast(&ctx->ctx_cond); 264 } 265 CTX_UNLOCK(ctx); 266 } 267 268 int 269 libusb_event_handling_ok(libusb_context *ctx) 270 { 271 ctx = GET_CONTEXT(ctx); 272 return (ctx->ctx_handler == pthread_self()); 273 } 274 275 int 276 libusb_event_handler_active(libusb_context *ctx) 277 { 278 ctx = GET_CONTEXT(ctx); 279 return (ctx->ctx_handler != NO_THREAD); 280 } 281 282 void 283 libusb_lock_event_waiters(libusb_context *ctx) 284 { 285 ctx = GET_CONTEXT(ctx); 286 CTX_LOCK(ctx); 287 } 288 289 void 290 libusb_unlock_event_waiters(libusb_context *ctx) 291 { 292 ctx = GET_CONTEXT(ctx); 293 CTX_UNLOCK(ctx); 294 } 295 296 int 297 libusb_wait_for_event(libusb_context *ctx, struct timeval *tv) 298 { 299 struct timespec ts; 300 int err; 301 302 ctx = GET_CONTEXT(ctx); 303 DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_wait_for_event enter"); 304 305 if (tv == NULL) { 306 pthread_cond_wait(&ctx->ctx_cond, 307 &ctx->ctx_lock); 308 return (0); 309 } 310 err = clock_gettime(CLOCK_REALTIME, &ts); 311 if (err < 0) 312 return (LIBUSB_ERROR_OTHER); 313 314 ts.tv_sec = tv->tv_sec; 315 ts.tv_nsec = tv->tv_usec * 1000; 316 if (ts.tv_nsec >= 1000000000) { 317 ts.tv_nsec -= 1000000000; 318 ts.tv_sec++; 319 } 320 err = pthread_cond_timedwait(&ctx->ctx_cond, 321 &ctx->ctx_lock, &ts); 322 323 if (err == ETIMEDOUT) 324 return (1); 325 326 return (0); 327 } 328 329 int 330 libusb_handle_events_timeout(libusb_context *ctx, struct timeval *tv) 331 { 332 int err; 333 334 ctx = GET_CONTEXT(ctx); 335 336 DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_handle_events_timeout enter"); 337 338 libusb_lock_events(ctx); 339 340 err = libusb_handle_events_locked(ctx, tv); 341 342 libusb_unlock_events(ctx); 343 344 DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_handle_events_timeout leave"); 345 346 return (err); 347 } 348 349 int 350 libusb_handle_events(libusb_context *ctx) 351 { 352 return (libusb_handle_events_timeout(ctx, NULL)); 353 } 354 355 int 356 libusb_handle_events_locked(libusb_context *ctx, struct timeval *tv) 357 { 358 int err; 359 360 ctx = GET_CONTEXT(ctx); 361 362 if (libusb_event_handling_ok(ctx)) { 363 err = libusb10_handle_events_sub(ctx, tv); 364 } else { 365 libusb_wait_for_event(ctx, tv); 366 err = 0; 367 } 368 return (err); 369 } 370 371 int 372 libusb_get_next_timeout(libusb_context *ctx, struct timeval *tv) 373 { 374 /* all timeouts are currently being done by the kernel */ 375 timerclear(tv); 376 return (0); 377 } 378 379 void 380 libusb_set_pollfd_notifiers(libusb_context *ctx, 381 libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb, 382 void *user_data) 383 { 384 ctx = GET_CONTEXT(ctx); 385 386 ctx->fd_added_cb = added_cb; 387 ctx->fd_removed_cb = removed_cb; 388 ctx->fd_cb_user_data = user_data; 389 } 390 391 struct libusb_pollfd ** 392 libusb_get_pollfds(libusb_context *ctx) 393 { 394 struct libusb_super_pollfd *pollfd; 395 libusb_pollfd **ret; 396 int i; 397 398 ctx = GET_CONTEXT(ctx); 399 400 CTX_LOCK(ctx); 401 402 i = 0; 403 TAILQ_FOREACH(pollfd, &ctx->pollfds, entry) 404 i++; 405 406 ret = calloc(i + 1, sizeof(struct libusb_pollfd *)); 407 if (ret == NULL) 408 goto done; 409 410 i = 0; 411 TAILQ_FOREACH(pollfd, &ctx->pollfds, entry) 412 ret[i++] = &pollfd->pollfd; 413 ret[i] = NULL; 414 415 done: 416 CTX_UNLOCK(ctx); 417 return (ret); 418 } 419 420 421 /* Synchronous device I/O */ 422 423 int 424 libusb_control_transfer(libusb_device_handle *devh, 425 uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex, 426 uint8_t *data, uint16_t wLength, unsigned int timeout) 427 { 428 struct LIBUSB20_CONTROL_SETUP_DECODED req; 429 int err; 430 uint16_t actlen; 431 432 if (devh == NULL) 433 return (LIBUSB_ERROR_INVALID_PARAM); 434 435 if ((wLength != 0) && (data == NULL)) 436 return (LIBUSB_ERROR_INVALID_PARAM); 437 438 LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req); 439 440 req.bmRequestType = bmRequestType; 441 req.bRequest = bRequest; 442 req.wValue = wValue; 443 req.wIndex = wIndex; 444 req.wLength = wLength; 445 446 err = libusb20_dev_request_sync(devh, &req, data, 447 &actlen, timeout, 0); 448 449 if (err == LIBUSB20_ERROR_PIPE) 450 return (LIBUSB_ERROR_PIPE); 451 else if (err == LIBUSB20_ERROR_TIMEOUT) 452 return (LIBUSB_ERROR_TIMEOUT); 453 else if (err) 454 return (LIBUSB_ERROR_NO_DEVICE); 455 456 return (actlen); 457 } 458 459 static void 460 libusb10_do_transfer_cb(struct libusb_transfer *transfer) 461 { 462 libusb_context *ctx; 463 int *pdone; 464 465 ctx = GET_CONTEXT(NULL); 466 467 DPRINTF(ctx, LIBUSB_DEBUG_TRANSFER, "sync I/O done"); 468 469 pdone = transfer->user_data; 470 *pdone = 1; 471 } 472 473 /* 474 * TODO: Replace the following function. Allocating and freeing on a 475 * per-transfer basis is slow. --HPS 476 */ 477 static int 478 libusb10_do_transfer(libusb_device_handle *devh, 479 uint8_t endpoint, uint8_t *data, int length, 480 int *transferred, unsigned int timeout, int type) 481 { 482 libusb_context *ctx; 483 struct libusb_transfer *xfer; 484 volatile int complet; 485 int ret; 486 487 if (devh == NULL) 488 return (LIBUSB_ERROR_INVALID_PARAM); 489 490 if ((length != 0) && (data == NULL)) 491 return (LIBUSB_ERROR_INVALID_PARAM); 492 493 xfer = libusb_alloc_transfer(0); 494 if (xfer == NULL) 495 return (LIBUSB_ERROR_NO_MEM); 496 497 ctx = libusb_get_device(devh)->ctx; 498 499 xfer->dev_handle = devh; 500 xfer->endpoint = endpoint; 501 xfer->type = type; 502 xfer->timeout = timeout; 503 xfer->buffer = data; 504 xfer->length = length; 505 xfer->user_data = (void *)&complet; 506 xfer->callback = libusb10_do_transfer_cb; 507 complet = 0; 508 509 if ((ret = libusb_submit_transfer(xfer)) < 0) { 510 libusb_free_transfer(xfer); 511 return (ret); 512 } 513 while (complet == 0) { 514 if ((ret = libusb_handle_events(ctx)) < 0) { 515 libusb_cancel_transfer(xfer); 516 usleep(1000); /* nice it */ 517 } 518 } 519 520 *transferred = xfer->actual_length; 521 522 switch (xfer->status) { 523 case LIBUSB_TRANSFER_COMPLETED: 524 ret = 0; 525 break; 526 case LIBUSB_TRANSFER_TIMED_OUT: 527 ret = LIBUSB_ERROR_TIMEOUT; 528 break; 529 case LIBUSB_TRANSFER_OVERFLOW: 530 ret = LIBUSB_ERROR_OVERFLOW; 531 break; 532 case LIBUSB_TRANSFER_STALL: 533 ret = LIBUSB_ERROR_PIPE; 534 break; 535 case LIBUSB_TRANSFER_NO_DEVICE: 536 ret = LIBUSB_ERROR_NO_DEVICE; 537 break; 538 default: 539 ret = LIBUSB_ERROR_OTHER; 540 break; 541 } 542 543 libusb_free_transfer(xfer); 544 return (ret); 545 } 546 547 int 548 libusb_bulk_transfer(libusb_device_handle *devh, 549 uint8_t endpoint, uint8_t *data, int length, 550 int *transferred, unsigned int timeout) 551 { 552 libusb_context *ctx; 553 int ret; 554 555 ctx = GET_CONTEXT(NULL); 556 DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer enter"); 557 558 ret = libusb10_do_transfer(devh, endpoint, data, length, transferred, 559 timeout, LIBUSB_TRANSFER_TYPE_BULK); 560 561 DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer leave"); 562 return (ret); 563 } 564 565 int 566 libusb_interrupt_transfer(libusb_device_handle *devh, 567 uint8_t endpoint, uint8_t *data, int length, 568 int *transferred, unsigned int timeout) 569 { 570 libusb_context *ctx; 571 int ret; 572 573 ctx = GET_CONTEXT(NULL); 574 DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer enter"); 575 576 ret = libusb10_do_transfer(devh, endpoint, data, length, transferred, 577 timeout, LIBUSB_TRANSFER_TYPE_INTERRUPT); 578 579 DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer leave"); 580 return (ret); 581 } 582 583 uint8_t * 584 libusb_get_iso_packet_buffer(struct libusb_transfer *transfer, uint32_t index) 585 { 586 uint8_t *ptr; 587 uint32_t n; 588 589 if (transfer->num_iso_packets < 0) 590 return (NULL); 591 592 if (index >= (uint32_t)transfer->num_iso_packets) 593 return (NULL); 594 595 ptr = transfer->buffer; 596 if (ptr == NULL) 597 return (NULL); 598 599 for (n = 0; n != index; n++) { 600 ptr += transfer->iso_packet_desc[n].length; 601 } 602 return (ptr); 603 } 604 605 uint8_t * 606 libusb_get_iso_packet_buffer_simple(struct libusb_transfer *transfer, uint32_t index) 607 { 608 uint8_t *ptr; 609 610 if (transfer->num_iso_packets < 0) 611 return (NULL); 612 613 if (index >= (uint32_t)transfer->num_iso_packets) 614 return (NULL); 615 616 ptr = transfer->buffer; 617 if (ptr == NULL) 618 return (NULL); 619 620 ptr += transfer->iso_packet_desc[0].length * index; 621 622 return (ptr); 623 } 624 625 void 626 libusb_set_iso_packet_lengths(struct libusb_transfer *transfer, uint32_t length) 627 { 628 int n; 629 630 if (transfer->num_iso_packets < 0) 631 return; 632 633 for (n = 0; n != transfer->num_iso_packets; n++) 634 transfer->iso_packet_desc[n].length = length; 635 } 636 637 uint8_t * 638 libusb_control_transfer_get_data(struct libusb_transfer *transfer) 639 { 640 if (transfer->buffer == NULL) 641 return (NULL); 642 643 return (transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE); 644 } 645 646 struct libusb_control_setup * 647 libusb_control_transfer_get_setup(struct libusb_transfer *transfer) 648 { 649 return ((struct libusb_control_setup *)transfer->buffer); 650 } 651 652 void 653 libusb_fill_control_setup(uint8_t *buf, uint8_t bmRequestType, 654 uint8_t bRequest, uint16_t wValue, 655 uint16_t wIndex, uint16_t wLength) 656 { 657 struct libusb_control_setup *req = (struct libusb_control_setup *)buf; 658 659 /* The alignment is OK for all fields below. */ 660 req->bmRequestType = bmRequestType; 661 req->bRequest = bRequest; 662 req->wValue = htole16(wValue); 663 req->wIndex = htole16(wIndex); 664 req->wLength = htole16(wLength); 665 } 666 667 void 668 libusb_fill_control_transfer(struct libusb_transfer *transfer, 669 libusb_device_handle *devh, uint8_t *buf, 670 libusb_transfer_cb_fn callback, void *user_data, 671 uint32_t timeout) 672 { 673 struct libusb_control_setup *setup = (struct libusb_control_setup *)buf; 674 675 transfer->dev_handle = devh; 676 transfer->endpoint = 0; 677 transfer->type = LIBUSB_TRANSFER_TYPE_CONTROL; 678 transfer->timeout = timeout; 679 transfer->buffer = buf; 680 if (setup != NULL) 681 transfer->length = LIBUSB_CONTROL_SETUP_SIZE 682 + le16toh(setup->wLength); 683 else 684 transfer->length = 0; 685 transfer->user_data = user_data; 686 transfer->callback = callback; 687 688 } 689 690 void 691 libusb_fill_bulk_transfer(struct libusb_transfer *transfer, 692 libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf, 693 int length, libusb_transfer_cb_fn callback, void *user_data, 694 uint32_t timeout) 695 { 696 transfer->dev_handle = devh; 697 transfer->endpoint = endpoint; 698 transfer->type = LIBUSB_TRANSFER_TYPE_BULK; 699 transfer->timeout = timeout; 700 transfer->buffer = buf; 701 transfer->length = length; 702 transfer->user_data = user_data; 703 transfer->callback = callback; 704 } 705 706 void 707 libusb_fill_interrupt_transfer(struct libusb_transfer *transfer, 708 libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf, 709 int length, libusb_transfer_cb_fn callback, void *user_data, 710 uint32_t timeout) 711 { 712 transfer->dev_handle = devh; 713 transfer->endpoint = endpoint; 714 transfer->type = LIBUSB_TRANSFER_TYPE_INTERRUPT; 715 transfer->timeout = timeout; 716 transfer->buffer = buf; 717 transfer->length = length; 718 transfer->user_data = user_data; 719 transfer->callback = callback; 720 } 721 722 void 723 libusb_fill_iso_transfer(struct libusb_transfer *transfer, 724 libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf, 725 int length, int npacket, libusb_transfer_cb_fn callback, 726 void *user_data, uint32_t timeout) 727 { 728 transfer->dev_handle = devh; 729 transfer->endpoint = endpoint; 730 transfer->type = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS; 731 transfer->timeout = timeout; 732 transfer->buffer = buf; 733 transfer->length = length; 734 transfer->num_iso_packets = npacket; 735 transfer->user_data = user_data; 736 transfer->callback = callback; 737 } 738 739