Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/usb/usb_handle_request.c
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1 /* $FreeBSD: releng/11.2/sys/dev/usb/usb_handle_request.c 331722 2018-03-29 02:50:57Z eadler $ */ 2 /*- 3 * Copyright (c) 2008 Hans Petter Selasky. 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 #ifdef USB_GLOBAL_INCLUDE_FILE 28 #include USB_GLOBAL_INCLUDE_FILE 29 #else 30 #include <sys/stdint.h> 31 #include <sys/stddef.h> 32 #include <sys/param.h> 33 #include <sys/queue.h> 34 #include <sys/types.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/bus.h> 38 #include <sys/module.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/condvar.h> 42 #include <sys/sysctl.h> 43 #include <sys/sx.h> 44 #include <sys/unistd.h> 45 #include <sys/callout.h> 46 #include <sys/malloc.h> 47 #include <sys/priv.h> 48 49 #include <dev/usb/usb.h> 50 #include <dev/usb/usbdi.h> 51 #include <dev/usb/usbdi_util.h> 52 #include "usb_if.h" 53 54 #define USB_DEBUG_VAR usb_debug 55 56 #include <dev/usb/usb_core.h> 57 #include <dev/usb/usb_process.h> 58 #include <dev/usb/usb_busdma.h> 59 #include <dev/usb/usb_transfer.h> 60 #include <dev/usb/usb_device.h> 61 #include <dev/usb/usb_debug.h> 62 #include <dev/usb/usb_dynamic.h> 63 #include <dev/usb/usb_hub.h> 64 65 #include <dev/usb/usb_controller.h> 66 #include <dev/usb/usb_bus.h> 67 #endif /* USB_GLOBAL_INCLUDE_FILE */ 68 69 /* function prototypes */ 70 71 static uint8_t usb_handle_get_stall(struct usb_device *, uint8_t); 72 static usb_error_t usb_handle_remote_wakeup(struct usb_xfer *, uint8_t); 73 static usb_error_t usb_handle_request(struct usb_xfer *); 74 static usb_error_t usb_handle_set_config(struct usb_xfer *, uint8_t); 75 static usb_error_t usb_handle_set_stall(struct usb_xfer *, uint8_t, 76 uint8_t); 77 static usb_error_t usb_handle_iface_request(struct usb_xfer *, void **, 78 uint16_t *, struct usb_device_request, uint16_t, 79 uint8_t); 80 81 /*------------------------------------------------------------------------* 82 * usb_handle_request_callback 83 * 84 * This function is the USB callback for generic USB Device control 85 * transfers. 86 *------------------------------------------------------------------------*/ 87 void 88 usb_handle_request_callback(struct usb_xfer *xfer, usb_error_t error) 89 { 90 usb_error_t err; 91 92 /* check the current transfer state */ 93 94 switch (USB_GET_STATE(xfer)) { 95 case USB_ST_SETUP: 96 case USB_ST_TRANSFERRED: 97 98 /* handle the request */ 99 err = usb_handle_request(xfer); 100 101 if (err) { 102 103 if (err == USB_ERR_BAD_CONTEXT) { 104 /* we need to re-setup the control transfer */ 105 usb_needs_explore(xfer->xroot->bus, 0); 106 break; 107 } 108 goto tr_restart; 109 } 110 usbd_transfer_submit(xfer); 111 break; 112 113 default: 114 /* check if a control transfer is active */ 115 if (xfer->flags_int.control_rem != 0xFFFF) { 116 /* handle the request */ 117 err = usb_handle_request(xfer); 118 } 119 if (xfer->error != USB_ERR_CANCELLED) { 120 /* should not happen - try stalling */ 121 goto tr_restart; 122 } 123 break; 124 } 125 return; 126 127 tr_restart: 128 /* 129 * If a control transfer is active, stall it, and wait for the 130 * next control transfer. 131 */ 132 usbd_xfer_set_frame_len(xfer, 0, sizeof(struct usb_device_request)); 133 xfer->nframes = 1; 134 xfer->flags.manual_status = 1; 135 xfer->flags.force_short_xfer = 0; 136 usbd_xfer_set_stall(xfer); /* cancel previous transfer, if any */ 137 usbd_transfer_submit(xfer); 138 } 139 140 /*------------------------------------------------------------------------* 141 * usb_handle_set_config 142 * 143 * Returns: 144 * 0: Success 145 * Else: Failure 146 *------------------------------------------------------------------------*/ 147 static usb_error_t 148 usb_handle_set_config(struct usb_xfer *xfer, uint8_t conf_no) 149 { 150 struct usb_device *udev = xfer->xroot->udev; 151 usb_error_t err = 0; 152 uint8_t do_unlock; 153 154 /* 155 * We need to protect against other threads doing probe and 156 * attach: 157 */ 158 USB_XFER_UNLOCK(xfer); 159 160 /* Prevent re-enumeration */ 161 do_unlock = usbd_enum_lock(udev); 162 163 if (conf_no == USB_UNCONFIG_NO) { 164 conf_no = USB_UNCONFIG_INDEX; 165 } else { 166 /* 167 * The relationship between config number and config index 168 * is very simple in our case: 169 */ 170 conf_no--; 171 } 172 173 if (usbd_set_config_index(udev, conf_no)) { 174 DPRINTF("set config %d failed\n", conf_no); 175 err = USB_ERR_STALLED; 176 goto done; 177 } 178 if (usb_probe_and_attach(udev, USB_IFACE_INDEX_ANY)) { 179 DPRINTF("probe and attach failed\n"); 180 err = USB_ERR_STALLED; 181 goto done; 182 } 183 done: 184 if (do_unlock) 185 usbd_enum_unlock(udev); 186 USB_XFER_LOCK(xfer); 187 return (err); 188 } 189 190 static usb_error_t 191 usb_check_alt_setting(struct usb_device *udev, 192 struct usb_interface *iface, uint8_t alt_index) 193 { 194 uint8_t do_unlock; 195 usb_error_t err = 0; 196 197 /* Prevent re-enumeration */ 198 do_unlock = usbd_enum_lock(udev); 199 200 if (alt_index >= usbd_get_no_alts(udev->cdesc, iface->idesc)) 201 err = USB_ERR_INVAL; 202 203 if (do_unlock) 204 usbd_enum_unlock(udev); 205 206 return (err); 207 } 208 209 /*------------------------------------------------------------------------* 210 * usb_handle_iface_request 211 * 212 * Returns: 213 * 0: Success 214 * Else: Failure 215 *------------------------------------------------------------------------*/ 216 static usb_error_t 217 usb_handle_iface_request(struct usb_xfer *xfer, 218 void **ppdata, uint16_t *plen, 219 struct usb_device_request req, uint16_t off, uint8_t state) 220 { 221 struct usb_interface *iface; 222 struct usb_interface *iface_parent; /* parent interface */ 223 struct usb_device *udev = xfer->xroot->udev; 224 int error; 225 uint8_t iface_index; 226 uint8_t temp_state; 227 uint8_t do_unlock; 228 229 if ((req.bmRequestType & 0x1F) == UT_INTERFACE) { 230 iface_index = req.wIndex[0]; /* unicast */ 231 } else { 232 iface_index = 0; /* broadcast */ 233 } 234 235 /* 236 * We need to protect against other threads doing probe and 237 * attach: 238 */ 239 USB_XFER_UNLOCK(xfer); 240 241 /* Prevent re-enumeration */ 242 do_unlock = usbd_enum_lock(udev); 243 244 error = ENXIO; 245 246 tr_repeat: 247 iface = usbd_get_iface(udev, iface_index); 248 if ((iface == NULL) || 249 (iface->idesc == NULL)) { 250 /* end of interfaces non-existing interface */ 251 goto tr_stalled; 252 } 253 /* set initial state */ 254 255 temp_state = state; 256 257 /* forward request to interface, if any */ 258 259 if ((error != 0) && 260 (error != ENOTTY) && 261 (iface->subdev != NULL) && 262 device_is_attached(iface->subdev)) { 263 #if 0 264 DEVMETHOD(usb_handle_request, NULL); /* dummy */ 265 #endif 266 error = USB_HANDLE_REQUEST(iface->subdev, 267 &req, ppdata, plen, 268 off, &temp_state); 269 } 270 iface_parent = usbd_get_iface(udev, iface->parent_iface_index); 271 272 if ((iface_parent == NULL) || 273 (iface_parent->idesc == NULL)) { 274 /* non-existing interface */ 275 iface_parent = NULL; 276 } 277 /* forward request to parent interface, if any */ 278 279 if ((error != 0) && 280 (error != ENOTTY) && 281 (iface_parent != NULL) && 282 (iface_parent->subdev != NULL) && 283 ((req.bmRequestType & 0x1F) == UT_INTERFACE) && 284 (iface_parent->subdev != iface->subdev) && 285 device_is_attached(iface_parent->subdev)) { 286 error = USB_HANDLE_REQUEST(iface_parent->subdev, 287 &req, ppdata, plen, off, &temp_state); 288 } 289 if (error == 0) { 290 /* negativly adjust pointer and length */ 291 *ppdata = ((uint8_t *)(*ppdata)) - off; 292 *plen += off; 293 294 if ((state == USB_HR_NOT_COMPLETE) && 295 (temp_state == USB_HR_COMPLETE_OK)) 296 goto tr_short; 297 else 298 goto tr_valid; 299 } else if (error == ENOTTY) { 300 goto tr_stalled; 301 } 302 if ((req.bmRequestType & 0x1F) != UT_INTERFACE) { 303 iface_index++; /* iterate */ 304 goto tr_repeat; 305 } 306 if (state != USB_HR_NOT_COMPLETE) { 307 /* we are complete */ 308 goto tr_valid; 309 } 310 switch (req.bmRequestType) { 311 case UT_WRITE_INTERFACE: 312 switch (req.bRequest) { 313 case UR_SET_INTERFACE: 314 /* 315 * We assume that the endpoints are the same 316 * across the alternate settings. 317 * 318 * Reset the endpoints, because re-attaching 319 * only a part of the device is not possible. 320 */ 321 error = usb_check_alt_setting(udev, 322 iface, req.wValue[0]); 323 if (error) { 324 DPRINTF("alt setting does not exist %s\n", 325 usbd_errstr(error)); 326 goto tr_stalled; 327 } 328 error = usb_reset_iface_endpoints(udev, iface_index); 329 if (error) { 330 DPRINTF("alt setting failed %s\n", 331 usbd_errstr(error)); 332 goto tr_stalled; 333 } 334 /* update the current alternate setting */ 335 iface->alt_index = req.wValue[0]; 336 break; 337 338 default: 339 goto tr_stalled; 340 } 341 break; 342 343 case UT_READ_INTERFACE: 344 switch (req.bRequest) { 345 case UR_GET_INTERFACE: 346 *ppdata = &iface->alt_index; 347 *plen = 1; 348 break; 349 350 default: 351 goto tr_stalled; 352 } 353 break; 354 default: 355 goto tr_stalled; 356 } 357 tr_valid: 358 if (do_unlock) 359 usbd_enum_unlock(udev); 360 USB_XFER_LOCK(xfer); 361 return (0); 362 363 tr_short: 364 if (do_unlock) 365 usbd_enum_unlock(udev); 366 USB_XFER_LOCK(xfer); 367 return (USB_ERR_SHORT_XFER); 368 369 tr_stalled: 370 if (do_unlock) 371 usbd_enum_unlock(udev); 372 USB_XFER_LOCK(xfer); 373 return (USB_ERR_STALLED); 374 } 375 376 /*------------------------------------------------------------------------* 377 * usb_handle_stall 378 * 379 * Returns: 380 * 0: Success 381 * Else: Failure 382 *------------------------------------------------------------------------*/ 383 static usb_error_t 384 usb_handle_set_stall(struct usb_xfer *xfer, uint8_t ep, uint8_t do_stall) 385 { 386 struct usb_device *udev = xfer->xroot->udev; 387 usb_error_t err; 388 389 USB_XFER_UNLOCK(xfer); 390 err = usbd_set_endpoint_stall(udev, 391 usbd_get_ep_by_addr(udev, ep), do_stall); 392 USB_XFER_LOCK(xfer); 393 return (err); 394 } 395 396 /*------------------------------------------------------------------------* 397 * usb_handle_get_stall 398 * 399 * Returns: 400 * 0: Success 401 * Else: Failure 402 *------------------------------------------------------------------------*/ 403 static uint8_t 404 usb_handle_get_stall(struct usb_device *udev, uint8_t ea_val) 405 { 406 struct usb_endpoint *ep; 407 uint8_t halted; 408 409 ep = usbd_get_ep_by_addr(udev, ea_val); 410 if (ep == NULL) { 411 /* nothing to do */ 412 return (0); 413 } 414 USB_BUS_LOCK(udev->bus); 415 halted = ep->is_stalled; 416 USB_BUS_UNLOCK(udev->bus); 417 418 return (halted); 419 } 420 421 /*------------------------------------------------------------------------* 422 * usb_handle_remote_wakeup 423 * 424 * Returns: 425 * 0: Success 426 * Else: Failure 427 *------------------------------------------------------------------------*/ 428 static usb_error_t 429 usb_handle_remote_wakeup(struct usb_xfer *xfer, uint8_t is_on) 430 { 431 struct usb_device *udev; 432 struct usb_bus *bus; 433 434 udev = xfer->xroot->udev; 435 bus = udev->bus; 436 437 USB_BUS_LOCK(bus); 438 439 if (is_on) { 440 udev->flags.remote_wakeup = 1; 441 } else { 442 udev->flags.remote_wakeup = 0; 443 } 444 445 USB_BUS_UNLOCK(bus); 446 447 #if USB_HAVE_POWERD 448 /* In case we are out of sync, update the power state. */ 449 usb_bus_power_update(udev->bus); 450 #endif 451 return (0); /* success */ 452 } 453 454 /*------------------------------------------------------------------------* 455 * usb_handle_request 456 * 457 * Internal state sequence: 458 * 459 * USB_HR_NOT_COMPLETE -> USB_HR_COMPLETE_OK v USB_HR_COMPLETE_ERR 460 * 461 * Returns: 462 * 0: Ready to start hardware 463 * Else: Stall current transfer, if any 464 *------------------------------------------------------------------------*/ 465 static usb_error_t 466 usb_handle_request(struct usb_xfer *xfer) 467 { 468 struct usb_device_request req; 469 struct usb_device *udev; 470 const void *src_zcopy; /* zero-copy source pointer */ 471 const void *src_mcopy; /* non zero-copy source pointer */ 472 uint16_t off; /* data offset */ 473 uint16_t rem; /* data remainder */ 474 uint16_t max_len; /* max fragment length */ 475 uint16_t wValue; 476 uint8_t state; 477 uint8_t is_complete = 1; 478 usb_error_t err; 479 union { 480 uWord wStatus; 481 uint8_t buf[2]; 482 } temp; 483 484 /* 485 * Filter the USB transfer state into 486 * something which we understand: 487 */ 488 489 switch (USB_GET_STATE(xfer)) { 490 case USB_ST_SETUP: 491 state = USB_HR_NOT_COMPLETE; 492 493 if (!xfer->flags_int.control_act) { 494 /* nothing to do */ 495 goto tr_stalled; 496 } 497 break; 498 case USB_ST_TRANSFERRED: 499 if (!xfer->flags_int.control_act) { 500 state = USB_HR_COMPLETE_OK; 501 } else { 502 state = USB_HR_NOT_COMPLETE; 503 } 504 break; 505 default: 506 state = USB_HR_COMPLETE_ERR; 507 break; 508 } 509 510 /* reset frame stuff */ 511 512 usbd_xfer_set_frame_len(xfer, 0, 0); 513 514 usbd_xfer_set_frame_offset(xfer, 0, 0); 515 usbd_xfer_set_frame_offset(xfer, sizeof(req), 1); 516 517 /* get the current request, if any */ 518 519 usbd_copy_out(xfer->frbuffers, 0, &req, sizeof(req)); 520 521 if (xfer->flags_int.control_rem == 0xFFFF) { 522 /* first time - not initialised */ 523 rem = UGETW(req.wLength); 524 off = 0; 525 } else { 526 /* not first time - initialised */ 527 rem = xfer->flags_int.control_rem; 528 off = UGETW(req.wLength) - rem; 529 } 530 531 /* set some defaults */ 532 533 max_len = 0; 534 src_zcopy = NULL; 535 src_mcopy = NULL; 536 udev = xfer->xroot->udev; 537 538 /* get some request fields decoded */ 539 540 wValue = UGETW(req.wValue); 541 542 DPRINTF("req 0x%02x 0x%02x 0x%04x 0x%04x " 543 "off=0x%x rem=0x%x, state=%d\n", req.bmRequestType, 544 req.bRequest, wValue, UGETW(req.wIndex), off, rem, state); 545 546 /* demultiplex the control request */ 547 548 switch (req.bmRequestType) { 549 case UT_READ_DEVICE: 550 if (state != USB_HR_NOT_COMPLETE) { 551 break; 552 } 553 switch (req.bRequest) { 554 case UR_GET_DESCRIPTOR: 555 goto tr_handle_get_descriptor; 556 case UR_GET_CONFIG: 557 goto tr_handle_get_config; 558 case UR_GET_STATUS: 559 goto tr_handle_get_status; 560 default: 561 goto tr_stalled; 562 } 563 break; 564 565 case UT_WRITE_DEVICE: 566 switch (req.bRequest) { 567 case UR_SET_ADDRESS: 568 goto tr_handle_set_address; 569 case UR_SET_CONFIG: 570 goto tr_handle_set_config; 571 case UR_CLEAR_FEATURE: 572 switch (wValue) { 573 case UF_DEVICE_REMOTE_WAKEUP: 574 goto tr_handle_clear_wakeup; 575 default: 576 goto tr_stalled; 577 } 578 break; 579 case UR_SET_FEATURE: 580 switch (wValue) { 581 case UF_DEVICE_REMOTE_WAKEUP: 582 goto tr_handle_set_wakeup; 583 default: 584 goto tr_stalled; 585 } 586 break; 587 default: 588 goto tr_stalled; 589 } 590 break; 591 592 case UT_WRITE_ENDPOINT: 593 switch (req.bRequest) { 594 case UR_CLEAR_FEATURE: 595 switch (wValue) { 596 case UF_ENDPOINT_HALT: 597 goto tr_handle_clear_halt; 598 default: 599 goto tr_stalled; 600 } 601 break; 602 case UR_SET_FEATURE: 603 switch (wValue) { 604 case UF_ENDPOINT_HALT: 605 goto tr_handle_set_halt; 606 default: 607 goto tr_stalled; 608 } 609 break; 610 default: 611 goto tr_stalled; 612 } 613 break; 614 615 case UT_READ_ENDPOINT: 616 switch (req.bRequest) { 617 case UR_GET_STATUS: 618 goto tr_handle_get_ep_status; 619 default: 620 goto tr_stalled; 621 } 622 break; 623 default: 624 /* we use "USB_ADD_BYTES" to de-const the src_zcopy */ 625 err = usb_handle_iface_request(xfer, 626 USB_ADD_BYTES(&src_zcopy, 0), 627 &max_len, req, off, state); 628 if (err == 0) { 629 is_complete = 0; 630 goto tr_valid; 631 } else if (err == USB_ERR_SHORT_XFER) { 632 goto tr_valid; 633 } 634 /* 635 * Reset zero-copy pointer and max length 636 * variable in case they were unintentionally 637 * set: 638 */ 639 src_zcopy = NULL; 640 max_len = 0; 641 642 /* 643 * Check if we have a vendor specific 644 * descriptor: 645 */ 646 goto tr_handle_get_descriptor; 647 } 648 goto tr_valid; 649 650 tr_handle_get_descriptor: 651 err = (usb_temp_get_desc_p) (udev, &req, &src_zcopy, &max_len); 652 if (err) 653 goto tr_stalled; 654 if (src_zcopy == NULL) 655 goto tr_stalled; 656 goto tr_valid; 657 658 tr_handle_get_config: 659 temp.buf[0] = udev->curr_config_no; 660 src_mcopy = temp.buf; 661 max_len = 1; 662 goto tr_valid; 663 664 tr_handle_get_status: 665 666 wValue = 0; 667 668 USB_BUS_LOCK(udev->bus); 669 if (udev->flags.remote_wakeup) { 670 wValue |= UDS_REMOTE_WAKEUP; 671 } 672 if (udev->flags.self_powered) { 673 wValue |= UDS_SELF_POWERED; 674 } 675 USB_BUS_UNLOCK(udev->bus); 676 677 USETW(temp.wStatus, wValue); 678 src_mcopy = temp.wStatus; 679 max_len = sizeof(temp.wStatus); 680 goto tr_valid; 681 682 tr_handle_set_address: 683 if (state == USB_HR_NOT_COMPLETE) { 684 if (wValue >= 0x80) { 685 /* invalid value */ 686 goto tr_stalled; 687 } else if (udev->curr_config_no != 0) { 688 /* we are configured ! */ 689 goto tr_stalled; 690 } 691 } else if (state != USB_HR_NOT_COMPLETE) { 692 udev->address = (wValue & 0x7F); 693 goto tr_bad_context; 694 } 695 goto tr_valid; 696 697 tr_handle_set_config: 698 if (state == USB_HR_NOT_COMPLETE) { 699 if (usb_handle_set_config(xfer, req.wValue[0])) { 700 goto tr_stalled; 701 } 702 } 703 goto tr_valid; 704 705 tr_handle_clear_halt: 706 if (state == USB_HR_NOT_COMPLETE) { 707 if (usb_handle_set_stall(xfer, req.wIndex[0], 0)) { 708 goto tr_stalled; 709 } 710 } 711 goto tr_valid; 712 713 tr_handle_clear_wakeup: 714 if (state == USB_HR_NOT_COMPLETE) { 715 if (usb_handle_remote_wakeup(xfer, 0)) { 716 goto tr_stalled; 717 } 718 } 719 goto tr_valid; 720 721 tr_handle_set_halt: 722 if (state == USB_HR_NOT_COMPLETE) { 723 if (usb_handle_set_stall(xfer, req.wIndex[0], 1)) { 724 goto tr_stalled; 725 } 726 } 727 goto tr_valid; 728 729 tr_handle_set_wakeup: 730 if (state == USB_HR_NOT_COMPLETE) { 731 if (usb_handle_remote_wakeup(xfer, 1)) { 732 goto tr_stalled; 733 } 734 } 735 goto tr_valid; 736 737 tr_handle_get_ep_status: 738 if (state == USB_HR_NOT_COMPLETE) { 739 temp.wStatus[0] = 740 usb_handle_get_stall(udev, req.wIndex[0]); 741 temp.wStatus[1] = 0; 742 src_mcopy = temp.wStatus; 743 max_len = sizeof(temp.wStatus); 744 } 745 goto tr_valid; 746 747 tr_valid: 748 if (state != USB_HR_NOT_COMPLETE) { 749 goto tr_stalled; 750 } 751 /* subtract offset from length */ 752 753 max_len -= off; 754 755 /* Compute the real maximum data length */ 756 757 if (max_len > xfer->max_data_length) { 758 max_len = usbd_xfer_max_len(xfer); 759 } 760 if (max_len > rem) { 761 max_len = rem; 762 } 763 /* 764 * If the remainder is greater than the maximum data length, 765 * we need to truncate the value for the sake of the 766 * comparison below: 767 */ 768 if (rem > xfer->max_data_length) { 769 rem = usbd_xfer_max_len(xfer); 770 } 771 if ((rem != max_len) && (is_complete != 0)) { 772 /* 773 * If we don't transfer the data we can transfer, then 774 * the transfer is short ! 775 */ 776 xfer->flags.force_short_xfer = 1; 777 xfer->nframes = 2; 778 } else { 779 /* 780 * Default case 781 */ 782 xfer->flags.force_short_xfer = 0; 783 xfer->nframes = max_len ? 2 : 1; 784 } 785 if (max_len > 0) { 786 if (src_mcopy) { 787 src_mcopy = USB_ADD_BYTES(src_mcopy, off); 788 usbd_copy_in(xfer->frbuffers + 1, 0, 789 src_mcopy, max_len); 790 usbd_xfer_set_frame_len(xfer, 1, max_len); 791 } else { 792 usbd_xfer_set_frame_data(xfer, 1, 793 USB_ADD_BYTES(src_zcopy, off), max_len); 794 } 795 } else { 796 /* the end is reached, send status */ 797 xfer->flags.manual_status = 0; 798 usbd_xfer_set_frame_len(xfer, 1, 0); 799 } 800 DPRINTF("success\n"); 801 return (0); /* success */ 802 803 tr_stalled: 804 DPRINTF("%s\n", (state != USB_HR_NOT_COMPLETE) ? 805 "complete" : "stalled"); 806 return (USB_ERR_STALLED); 807 808 tr_bad_context: 809 DPRINTF("bad context\n"); 810 return (USB_ERR_BAD_CONTEXT); 811 }
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