1 /* $FreeBSD$ */ 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 #include <sys/stdint.h> 28 #include <sys/param.h> 29 #include <sys/queue.h> 30 #include <sys/types.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/bus.h> 34 #include <sys/module.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/condvar.h> 38 #include <sys/sysctl.h> 39 #include <sys/unistd.h> 40 #include <sys/callout.h> 41 #include <sys/malloc.h> 42 #include <sys/priv.h> 43 44 #include <bus/u4b/usb.h> 45 #include <bus/u4b/usbdi.h> 46 #include <bus/u4b/usbdi_util.h> 47 #include "usb_if.h" 48 49 #define USB_DEBUG_VAR usb_debug 50 51 #include <bus/u4b/usb_core.h> 52 #include <bus/u4b/usb_process.h> 53 #include <bus/u4b/usb_busdma.h> 54 #include <bus/u4b/usb_transfer.h> 55 #include <bus/u4b/usb_device.h> 56 #include <bus/u4b/usb_debug.h> 57 #include <bus/u4b/usb_dynamic.h> 58 #include <bus/u4b/usb_hub.h> 59 60 #include <bus/u4b/usb_controller.h> 61 #include <bus/u4b/usb_bus.h> 62 63 /* function prototypes */ 64 65 static uint8_t usb_handle_get_stall(struct usb_device *, uint8_t); 66 static usb_error_t usb_handle_remote_wakeup(struct usb_xfer *, uint8_t); 67 static usb_error_t usb_handle_request(struct usb_xfer *); 68 static usb_error_t usb_handle_set_config(struct usb_xfer *, uint8_t); 69 static usb_error_t usb_handle_set_stall(struct usb_xfer *, uint8_t, 70 uint8_t); 71 static usb_error_t usb_handle_iface_request(struct usb_xfer *, void **, 72 uint16_t *, struct usb_device_request, uint16_t, 73 uint8_t); 74 75 /*------------------------------------------------------------------------* 76 * usb_handle_request_callback 77 * 78 * This function is the USB callback for generic USB Device control 79 * transfers. 80 *------------------------------------------------------------------------*/ 81 void 82 usb_handle_request_callback(struct usb_xfer *xfer, usb_error_t error) 83 { 84 usb_error_t err; 85 86 /* check the current transfer state */ 87 88 switch (USB_GET_STATE(xfer)) { 89 case USB_ST_SETUP: 90 case USB_ST_TRANSFERRED: 91 92 /* handle the request */ 93 err = usb_handle_request(xfer); 94 95 if (err) { 96 97 if (err == USB_ERR_BAD_CONTEXT) { 98 /* we need to re-setup the control transfer */ 99 usb_needs_explore(xfer->xroot->bus, 0); 100 break; 101 } 102 goto tr_restart; 103 } 104 usbd_transfer_submit(xfer); 105 break; 106 107 default: 108 /* check if a control transfer is active */ 109 if (xfer->flags_int.control_rem != 0xFFFF) { 110 /* handle the request */ 111 err = usb_handle_request(xfer); 112 } 113 if (xfer->error != USB_ERR_CANCELLED) { 114 /* should not happen - try stalling */ 115 goto tr_restart; 116 } 117 break; 118 } 119 return; 120 121 tr_restart: 122 /* 123 * If a control transfer is active, stall it, and wait for the 124 * next control transfer. 125 */ 126 usbd_xfer_set_frame_len(xfer, 0, sizeof(struct usb_device_request)); 127 xfer->nframes = 1; 128 xfer->flags.manual_status = 1; 129 xfer->flags.force_short_xfer = 0; 130 usbd_xfer_set_stall(xfer); /* cancel previous transfer, if any */ 131 usbd_transfer_submit(xfer); 132 } 133 134 /*------------------------------------------------------------------------* 135 * usb_handle_set_config 136 * 137 * Returns: 138 * 0: Success 139 * Else: Failure 140 *------------------------------------------------------------------------*/ 141 static usb_error_t 142 usb_handle_set_config(struct usb_xfer *xfer, uint8_t conf_no) 143 { 144 struct usb_device *udev = xfer->xroot->udev; 145 usb_error_t err = 0; 146 147 /* 148 * We need to protect against other threads doing probe and 149 * attach: 150 */ 151 USB_XFER_UNLOCK(xfer); 152 153 usbd_enum_lock(udev); 154 155 if (conf_no == USB_UNCONFIG_NO) { 156 conf_no = USB_UNCONFIG_INDEX; 157 } else { 158 /* 159 * The relationship between config number and config index 160 * is very simple in our case: 161 */ 162 conf_no--; 163 } 164 165 if (usbd_set_config_index(udev, conf_no)) { 166 DPRINTF("set config %d failed\n", conf_no); 167 err = USB_ERR_STALLED; 168 goto done; 169 } 170 if (usb_probe_and_attach(udev, USB_IFACE_INDEX_ANY)) { 171 DPRINTF("probe and attach failed\n"); 172 err = USB_ERR_STALLED; 173 goto done; 174 } 175 done: 176 usbd_enum_unlock(udev); 177 USB_XFER_LOCK(xfer); 178 return (err); 179 } 180 181 static usb_error_t 182 usb_check_alt_setting(struct usb_device *udev, 183 struct usb_interface *iface, uint8_t alt_index) 184 { 185 uint8_t do_unlock; 186 usb_error_t err = 0; 187 188 /* automatic locking */ 189 if (usbd_enum_is_locked(udev)) { 190 do_unlock = 0; 191 } else { 192 do_unlock = 1; 193 usbd_enum_lock(udev); 194 } 195 196 if (alt_index >= usbd_get_no_alts(udev->cdesc, iface->idesc)) 197 err = USB_ERR_INVAL; 198 199 if (do_unlock) 200 usbd_enum_unlock(udev); 201 202 return (err); 203 } 204 205 /*------------------------------------------------------------------------* 206 * usb_handle_iface_request 207 * 208 * Returns: 209 * 0: Success 210 * Else: Failure 211 *------------------------------------------------------------------------*/ 212 static usb_error_t 213 usb_handle_iface_request(struct usb_xfer *xfer, 214 void **ppdata, uint16_t *plen, 215 struct usb_device_request req, uint16_t off, uint8_t state) 216 { 217 struct usb_interface *iface; 218 struct usb_interface *iface_parent; /* parent interface */ 219 struct usb_device *udev = xfer->xroot->udev; 220 int error; 221 uint8_t iface_index; 222 uint8_t temp_state; 223 224 if ((req.bmRequestType & 0x1F) == UT_INTERFACE) { 225 iface_index = req.wIndex[0]; /* unicast */ 226 } else { 227 iface_index = 0; /* broadcast */ 228 } 229 230 /* 231 * We need to protect against other threads doing probe and 232 * attach: 233 */ 234 USB_XFER_UNLOCK(xfer); 235 236 usbd_enum_lock(udev); 237 238 error = ENXIO; 239 240 tr_repeat: 241 iface = usbd_get_iface(udev, iface_index); 242 if ((iface == NULL) || 243 (iface->idesc == NULL)) { 244 /* end of interfaces non-existing interface */ 245 goto tr_stalled; 246 } 247 /* set initial state */ 248 249 temp_state = state; 250 251 /* forward request to interface, if any */ 252 253 if ((error != 0) && 254 (error != ENOTTY) && 255 (iface->subdev != NULL) && 256 device_is_attached(iface->subdev)) { 257 #if 0 258 DEVMETHOD(usb_handle_request, NULL); /* dummy */ 259 #endif 260 error = USB_HANDLE_REQUEST(iface->subdev, 261 &req, ppdata, plen, 262 off, &temp_state); 263 } 264 iface_parent = usbd_get_iface(udev, iface->parent_iface_index); 265 266 if ((iface_parent == NULL) || 267 (iface_parent->idesc == NULL)) { 268 /* non-existing interface */ 269 iface_parent = NULL; 270 } 271 /* forward request to parent interface, if any */ 272 273 if ((error != 0) && 274 (error != ENOTTY) && 275 (iface_parent != NULL) && 276 (iface_parent->subdev != NULL) && 277 ((req.bmRequestType & 0x1F) == UT_INTERFACE) && 278 (iface_parent->subdev != iface->subdev) && 279 device_is_attached(iface_parent->subdev)) { 280 error = USB_HANDLE_REQUEST(iface_parent->subdev, 281 &req, ppdata, plen, off, &temp_state); 282 } 283 if (error == 0) { 284 /* negativly adjust pointer and length */ 285 *ppdata = ((uint8_t *)(*ppdata)) - off; 286 *plen += off; 287 288 if ((state == USB_HR_NOT_COMPLETE) && 289 (temp_state == USB_HR_COMPLETE_OK)) 290 goto tr_short; 291 else 292 goto tr_valid; 293 } else if (error == ENOTTY) { 294 goto tr_stalled; 295 } 296 if ((req.bmRequestType & 0x1F) != UT_INTERFACE) { 297 iface_index++; /* iterate */ 298 goto tr_repeat; 299 } 300 if (state != USB_HR_NOT_COMPLETE) { 301 /* we are complete */ 302 goto tr_valid; 303 } 304 switch (req.bmRequestType) { 305 case UT_WRITE_INTERFACE: 306 switch (req.bRequest) { 307 case UR_SET_INTERFACE: 308 /* 309 * We assume that the endpoints are the same 310 * accross the alternate settings. 311 * 312 * Reset the endpoints, because re-attaching 313 * only a part of the device is not possible. 314 */ 315 error = usb_check_alt_setting(udev, 316 iface, req.wValue[0]); 317 if (error) { 318 DPRINTF("alt setting does not exist %s\n", 319 usbd_errstr(error)); 320 goto tr_stalled; 321 } 322 error = usb_reset_iface_endpoints(udev, iface_index); 323 if (error) { 324 DPRINTF("alt setting failed %s\n", 325 usbd_errstr(error)); 326 goto tr_stalled; 327 } 328 /* update the current alternate setting */ 329 iface->alt_index = req.wValue[0]; 330 break; 331 332 default: 333 goto tr_stalled; 334 } 335 break; 336 337 case UT_READ_INTERFACE: 338 switch (req.bRequest) { 339 case UR_GET_INTERFACE: 340 *ppdata = &iface->alt_index; 341 *plen = 1; 342 break; 343 344 default: 345 goto tr_stalled; 346 } 347 break; 348 default: 349 goto tr_stalled; 350 } 351 tr_valid: 352 usbd_enum_unlock(udev); 353 USB_XFER_LOCK(xfer); 354 return (0); 355 356 tr_short: 357 usbd_enum_unlock(udev); 358 USB_XFER_LOCK(xfer); 359 return (USB_ERR_SHORT_XFER); 360 361 tr_stalled: 362 usbd_enum_unlock(udev); 363 USB_XFER_LOCK(xfer); 364 return (USB_ERR_STALLED); 365 } 366 367 /*------------------------------------------------------------------------* 368 * usb_handle_stall 369 * 370 * Returns: 371 * 0: Success 372 * Else: Failure 373 *------------------------------------------------------------------------*/ 374 static usb_error_t 375 usb_handle_set_stall(struct usb_xfer *xfer, uint8_t ep, uint8_t do_stall) 376 { 377 struct usb_device *udev = xfer->xroot->udev; 378 usb_error_t err; 379 380 USB_XFER_UNLOCK(xfer); 381 err = usbd_set_endpoint_stall(udev, 382 usbd_get_ep_by_addr(udev, ep), do_stall); 383 USB_XFER_LOCK(xfer); 384 return (err); 385 } 386 387 /*------------------------------------------------------------------------* 388 * usb_handle_get_stall 389 * 390 * Returns: 391 * 0: Success 392 * Else: Failure 393 *------------------------------------------------------------------------*/ 394 static uint8_t 395 usb_handle_get_stall(struct usb_device *udev, uint8_t ea_val) 396 { 397 struct usb_endpoint *ep; 398 uint8_t halted; 399 400 ep = usbd_get_ep_by_addr(udev, ea_val); 401 if (ep == NULL) { 402 /* nothing to do */ 403 return (0); 404 } 405 USB_BUS_LOCK(udev->bus); 406 halted = ep->is_stalled; 407 USB_BUS_UNLOCK(udev->bus); 408 409 return (halted); 410 } 411 412 /*------------------------------------------------------------------------* 413 * usb_handle_remote_wakeup 414 * 415 * Returns: 416 * 0: Success 417 * Else: Failure 418 *------------------------------------------------------------------------*/ 419 static usb_error_t 420 usb_handle_remote_wakeup(struct usb_xfer *xfer, uint8_t is_on) 421 { 422 struct usb_device *udev; 423 struct usb_bus *bus; 424 425 udev = xfer->xroot->udev; 426 bus = udev->bus; 427 428 USB_BUS_LOCK(bus); 429 430 if (is_on) { 431 udev->flags.remote_wakeup = 1; 432 } else { 433 udev->flags.remote_wakeup = 0; 434 } 435 436 USB_BUS_UNLOCK(bus); 437 438 #if USB_HAVE_POWERD 439 /* In case we are out of sync, update the power state. */ 440 usb_bus_power_update(udev->bus); 441 #endif 442 return (0); /* success */ 443 } 444 445 /*------------------------------------------------------------------------* 446 * usb_handle_request 447 * 448 * Internal state sequence: 449 * 450 * USB_HR_NOT_COMPLETE -> USB_HR_COMPLETE_OK v USB_HR_COMPLETE_ERR 451 * 452 * Returns: 453 * 0: Ready to start hardware 454 * Else: Stall current transfer, if any 455 *------------------------------------------------------------------------*/ 456 static usb_error_t 457 usb_handle_request(struct usb_xfer *xfer) 458 { 459 struct usb_device_request req; 460 struct usb_device *udev; 461 const void *src_zcopy; /* zero-copy source pointer */ 462 const void *src_mcopy; /* non zero-copy source pointer */ 463 uint16_t off; /* data offset */ 464 uint16_t rem; /* data remainder */ 465 uint16_t max_len; /* max fragment length */ 466 uint16_t wValue; 467 uint16_t wIndex; 468 uint8_t state; 469 uint8_t is_complete = 1; 470 usb_error_t err; 471 union { 472 uWord wStatus; 473 uint8_t buf[2]; 474 } temp; 475 476 /* 477 * Filter the USB transfer state into 478 * something which we understand: 479 */ 480 481 switch (USB_GET_STATE(xfer)) { 482 case USB_ST_SETUP: 483 state = USB_HR_NOT_COMPLETE; 484 485 if (!xfer->flags_int.control_act) { 486 /* nothing to do */ 487 goto tr_stalled; 488 } 489 break; 490 case USB_ST_TRANSFERRED: 491 if (!xfer->flags_int.control_act) { 492 state = USB_HR_COMPLETE_OK; 493 } else { 494 state = USB_HR_NOT_COMPLETE; 495 } 496 break; 497 default: 498 state = USB_HR_COMPLETE_ERR; 499 break; 500 } 501 502 /* reset frame stuff */ 503 504 usbd_xfer_set_frame_len(xfer, 0, 0); 505 506 usbd_xfer_set_frame_offset(xfer, 0, 0); 507 usbd_xfer_set_frame_offset(xfer, sizeof(req), 1); 508 509 /* get the current request, if any */ 510 511 usbd_copy_out(xfer->frbuffers, 0, &req, sizeof(req)); 512 513 if (xfer->flags_int.control_rem == 0xFFFF) { 514 /* first time - not initialised */ 515 rem = UGETW(req.wLength); 516 off = 0; 517 } else { 518 /* not first time - initialised */ 519 rem = xfer->flags_int.control_rem; 520 off = UGETW(req.wLength) - rem; 521 } 522 523 /* set some defaults */ 524 525 max_len = 0; 526 src_zcopy = NULL; 527 src_mcopy = NULL; 528 udev = xfer->xroot->udev; 529 530 /* get some request fields decoded */ 531 532 wValue = UGETW(req.wValue); 533 wIndex = UGETW(req.wIndex); 534 535 DPRINTF("req 0x%02x 0x%02x 0x%04x 0x%04x " 536 "off=0x%x rem=0x%x, state=%d\n", req.bmRequestType, 537 req.bRequest, wValue, wIndex, off, rem, state); 538 539 /* demultiplex the control request */ 540 541 switch (req.bmRequestType) { 542 case UT_READ_DEVICE: 543 if (state != USB_HR_NOT_COMPLETE) { 544 break; 545 } 546 switch (req.bRequest) { 547 case UR_GET_DESCRIPTOR: 548 goto tr_handle_get_descriptor; 549 case UR_GET_CONFIG: 550 goto tr_handle_get_config; 551 case UR_GET_STATUS: 552 goto tr_handle_get_status; 553 default: 554 goto tr_stalled; 555 } 556 break; 557 558 case UT_WRITE_DEVICE: 559 switch (req.bRequest) { 560 case UR_SET_ADDRESS: 561 goto tr_handle_set_address; 562 case UR_SET_CONFIG: 563 goto tr_handle_set_config; 564 case UR_CLEAR_FEATURE: 565 switch (wValue) { 566 case UF_DEVICE_REMOTE_WAKEUP: 567 goto tr_handle_clear_wakeup; 568 default: 569 goto tr_stalled; 570 } 571 break; 572 case UR_SET_FEATURE: 573 switch (wValue) { 574 case UF_DEVICE_REMOTE_WAKEUP: 575 goto tr_handle_set_wakeup; 576 default: 577 goto tr_stalled; 578 } 579 break; 580 default: 581 goto tr_stalled; 582 } 583 break; 584 585 case UT_WRITE_ENDPOINT: 586 switch (req.bRequest) { 587 case UR_CLEAR_FEATURE: 588 switch (wValue) { 589 case UF_ENDPOINT_HALT: 590 goto tr_handle_clear_halt; 591 default: 592 goto tr_stalled; 593 } 594 break; 595 case UR_SET_FEATURE: 596 switch (wValue) { 597 case UF_ENDPOINT_HALT: 598 goto tr_handle_set_halt; 599 default: 600 goto tr_stalled; 601 } 602 break; 603 default: 604 goto tr_stalled; 605 } 606 break; 607 608 case UT_READ_ENDPOINT: 609 switch (req.bRequest) { 610 case UR_GET_STATUS: 611 goto tr_handle_get_ep_status; 612 default: 613 goto tr_stalled; 614 } 615 break; 616 default: 617 /* we use "USB_ADD_BYTES" to de-const the src_zcopy */ 618 err = usb_handle_iface_request(xfer, 619 USB_ADD_BYTES(&src_zcopy, 0), 620 &max_len, req, off, state); 621 if (err == 0) { 622 is_complete = 0; 623 goto tr_valid; 624 } else if (err == USB_ERR_SHORT_XFER) { 625 goto tr_valid; 626 } 627 /* 628 * Reset zero-copy pointer and max length 629 * variable in case they were unintentionally 630 * set: 631 */ 632 src_zcopy = NULL; 633 max_len = 0; 634 635 /* 636 * Check if we have a vendor specific 637 * descriptor: 638 */ 639 goto tr_handle_get_descriptor; 640 } 641 goto tr_valid; 642 643 tr_handle_get_descriptor: 644 err = (usb_temp_get_desc_p) (udev, &req, &src_zcopy, &max_len); 645 if (err) 646 goto tr_stalled; 647 if (src_zcopy == NULL) 648 goto tr_stalled; 649 goto tr_valid; 650 651 tr_handle_get_config: 652 temp.buf[0] = udev->curr_config_no; 653 src_mcopy = temp.buf; 654 max_len = 1; 655 goto tr_valid; 656 657 tr_handle_get_status: 658 659 wValue = 0; 660 661 USB_BUS_LOCK(udev->bus); 662 if (udev->flags.remote_wakeup) { 663 wValue |= UDS_REMOTE_WAKEUP; 664 } 665 if (udev->flags.self_powered) { 666 wValue |= UDS_SELF_POWERED; 667 } 668 USB_BUS_UNLOCK(udev->bus); 669 670 USETW(temp.wStatus, wValue); 671 src_mcopy = temp.wStatus; 672 max_len = sizeof(temp.wStatus); 673 goto tr_valid; 674 675 tr_handle_set_address: 676 if (state == USB_HR_NOT_COMPLETE) { 677 if (wValue >= 0x80) { 678 /* invalid value */ 679 goto tr_stalled; 680 } else if (udev->curr_config_no != 0) { 681 /* we are configured ! */ 682 goto tr_stalled; 683 } 684 } else if (state != USB_HR_NOT_COMPLETE) { 685 udev->address = (wValue & 0x7F); 686 goto tr_bad_context; 687 } 688 goto tr_valid; 689 690 tr_handle_set_config: 691 if (state == USB_HR_NOT_COMPLETE) { 692 if (usb_handle_set_config(xfer, req.wValue[0])) { 693 goto tr_stalled; 694 } 695 } 696 goto tr_valid; 697 698 tr_handle_clear_halt: 699 if (state == USB_HR_NOT_COMPLETE) { 700 if (usb_handle_set_stall(xfer, req.wIndex[0], 0)) { 701 goto tr_stalled; 702 } 703 } 704 goto tr_valid; 705 706 tr_handle_clear_wakeup: 707 if (state == USB_HR_NOT_COMPLETE) { 708 if (usb_handle_remote_wakeup(xfer, 0)) { 709 goto tr_stalled; 710 } 711 } 712 goto tr_valid; 713 714 tr_handle_set_halt: 715 if (state == USB_HR_NOT_COMPLETE) { 716 if (usb_handle_set_stall(xfer, req.wIndex[0], 1)) { 717 goto tr_stalled; 718 } 719 } 720 goto tr_valid; 721 722 tr_handle_set_wakeup: 723 if (state == USB_HR_NOT_COMPLETE) { 724 if (usb_handle_remote_wakeup(xfer, 1)) { 725 goto tr_stalled; 726 } 727 } 728 goto tr_valid; 729 730 tr_handle_get_ep_status: 731 if (state == USB_HR_NOT_COMPLETE) { 732 temp.wStatus[0] = 733 usb_handle_get_stall(udev, req.wIndex[0]); 734 temp.wStatus[1] = 0; 735 src_mcopy = temp.wStatus; 736 max_len = sizeof(temp.wStatus); 737 } 738 goto tr_valid; 739 740 tr_valid: 741 if (state != USB_HR_NOT_COMPLETE) { 742 goto tr_stalled; 743 } 744 /* subtract offset from length */ 745 746 max_len -= off; 747 748 /* Compute the real maximum data length */ 749 750 if (max_len > xfer->max_data_length) { 751 max_len = usbd_xfer_max_len(xfer); 752 } 753 if (max_len > rem) { 754 max_len = rem; 755 } 756 /* 757 * If the remainder is greater than the maximum data length, 758 * we need to truncate the value for the sake of the 759 * comparison below: 760 */ 761 if (rem > xfer->max_data_length) { 762 rem = usbd_xfer_max_len(xfer); 763 } 764 if ((rem != max_len) && (is_complete != 0)) { 765 /* 766 * If we don't transfer the data we can transfer, then 767 * the transfer is short ! 768 */ 769 xfer->flags.force_short_xfer = 1; 770 xfer->nframes = 2; 771 } else { 772 /* 773 * Default case 774 */ 775 xfer->flags.force_short_xfer = 0; 776 xfer->nframes = max_len ? 2 : 1; 777 } 778 if (max_len > 0) { 779 if (src_mcopy) { 780 src_mcopy = USB_ADD_BYTES(src_mcopy, off); 781 usbd_copy_in(xfer->frbuffers + 1, 0, 782 src_mcopy, max_len); 783 usbd_xfer_set_frame_len(xfer, 1, max_len); 784 } else { 785 usbd_xfer_set_frame_data(xfer, 1, 786 USB_ADD_BYTES(src_zcopy, off), max_len); 787 } 788 } else { 789 /* the end is reached, send status */ 790 xfer->flags.manual_status = 0; 791 usbd_xfer_set_frame_len(xfer, 1, 0); 792 } 793 DPRINTF("success\n"); 794 return (0); /* success */ 795 796 tr_stalled: 797 DPRINTF("%s\n", (state != USB_HR_NOT_COMPLETE) ? 798 "complete" : "stalled"); 799 return (USB_ERR_STALLED); 800 801 tr_bad_context: 802 DPRINTF("bad context\n"); 803 return (USB_ERR_BAD_CONTEXT); 804 } 805