lib/libusb/libusb20.c

   1 /* $FreeBSD: head/lib/libusb/libusb20.c 253339 2013-07-14 10:22:00Z hselasky $ */
   2 /*-
   3  * Copyright (c) 2008-2009 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 LIBUSB_GLOBAL_INCLUDE_FILE
  28 #include LIBUSB_GLOBAL_INCLUDE_FILE
  29 #else
  30 #include <ctype.h>
  31 #include <poll.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <time.h>
  36 #include <sys/queue.h>
  37 #endif
  38
  39 #include "libusb20.h"
  40 #include "libusb20_desc.h"
  41 #include "libusb20_int.h"
  42
  43 static int
  44 dummy_int(void)
  45 {
  46         return (LIBUSB20_ERROR_NOT_SUPPORTED);
  47 }
  48
  49 static void
  50 dummy_void(void)
  51 {
  52         return;
  53 }
  54
  55 static void
  56 dummy_callback(struct libusb20_transfer *xfer)
  57 {
  58         ;                               /* style fix */
  59         switch (libusb20_tr_get_status(xfer)) {
  60         case LIBUSB20_TRANSFER_START:
  61                 libusb20_tr_submit(xfer);
  62                 break;
  63         default:
  64                 /* complete or error */
  65                 break;
  66         }
  67         return;
  68 }
  69
  70 #define dummy_get_config_desc_full (void *)dummy_int
  71 #define dummy_get_config_index (void *)dummy_int
  72 #define dummy_set_config_index (void *)dummy_int
  73 #define dummy_set_alt_index (void *)dummy_int
  74 #define dummy_reset_device (void *)dummy_int
  75 #define dummy_check_connected (void *)dummy_int
  76 #define dummy_set_power_mode (void *)dummy_int
  77 #define dummy_get_power_mode (void *)dummy_int
  78 #define dummy_get_port_path (void *)dummy_int
  79 #define dummy_get_power_usage (void *)dummy_int
  80 #define dummy_kernel_driver_active (void *)dummy_int
  81 #define dummy_detach_kernel_driver (void *)dummy_int
  82 #define dummy_do_request_sync (void *)dummy_int
  83 #define dummy_tr_open (void *)dummy_int
  84 #define dummy_tr_close (void *)dummy_int
  85 #define dummy_tr_clear_stall_sync (void *)dummy_int
  86 #define dummy_process (void *)dummy_int
  87 #define dummy_dev_info (void *)dummy_int
  88 #define dummy_dev_get_iface_driver (void *)dummy_int
  89
  90 #define dummy_tr_submit (void *)dummy_void
  91 #define dummy_tr_cancel_async (void *)dummy_void
  92
  93 static const struct libusb20_device_methods libusb20_dummy_methods = {
  94         LIBUSB20_DEVICE(LIBUSB20_DECLARE, dummy)
  95 };
  96
  97 void
  98 libusb20_tr_callback_wrapper(struct libusb20_transfer *xfer)
  99 {
 100         ;                               /* style fix */
 101
 102 repeat:
 103
 104         if (!xfer->is_pending) {
 105                 xfer->status = LIBUSB20_TRANSFER_START;
 106         } else {
 107                 xfer->is_pending = 0;
 108         }
 109
 110         xfer->callback(xfer);
 111
 112         if (xfer->is_restart) {
 113                 xfer->is_restart = 0;
 114                 goto repeat;
 115         }
 116         if (xfer->is_draining &&
 117             (!xfer->is_pending)) {
 118                 xfer->is_draining = 0;
 119                 xfer->status = LIBUSB20_TRANSFER_DRAINED;
 120                 xfer->callback(xfer);
 121         }
 122         return;
 123 }
 124
 125 int
 126 libusb20_tr_close(struct libusb20_transfer *xfer)
 127 {
 128         int error;
 129
 130         if (!xfer->is_opened) {
 131                 return (LIBUSB20_ERROR_OTHER);
 132         }
 133         error = xfer->pdev->methods->tr_close(xfer);
 134
 135         if (xfer->pLength) {
 136                 free(xfer->pLength);
 137         }
 138         if (xfer->ppBuffer) {
 139                 free(xfer->ppBuffer);
 140         }
 141         /* reset variable fields in case the transfer is opened again */
 142         xfer->priv_sc0 = 0;
 143         xfer->priv_sc1 = 0;
 144         xfer->is_opened = 0;
 145         xfer->is_pending = 0;
 146         xfer->is_cancel = 0;
 147         xfer->is_draining = 0;
 148         xfer->is_restart = 0;
 149         xfer->status = 0;
 150         xfer->flags = 0;
 151         xfer->nFrames = 0;
 152         xfer->aFrames = 0;
 153         xfer->timeout = 0;
 154         xfer->maxFrames = 0;
 155         xfer->maxTotalLength = 0;
 156         xfer->maxPacketLen = 0;
 157         return (error);
 158 }
 159
 160 int
 161 libusb20_tr_open(struct libusb20_transfer *xfer, uint32_t MaxBufSize,
 162     uint32_t MaxFrameCount, uint8_t ep_no)
 163 {
 164         return (libusb20_tr_open_stream(xfer, MaxBufSize, MaxFrameCount, ep_no, 0));
 165 }
 166
 167 int
 168 libusb20_tr_open_stream(struct libusb20_transfer *xfer, uint32_t MaxBufSize,
 169     uint32_t MaxFrameCount, uint8_t ep_no, uint16_t stream_id)
 170 {
 171         uint32_t size;
 172         uint8_t pre_scale;
 173         int error;
 174
 175         if (xfer->is_opened)
 176                 return (LIBUSB20_ERROR_BUSY);
 177         if (MaxFrameCount & LIBUSB20_MAX_FRAME_PRE_SCALE) {
 178                 MaxFrameCount &= ~LIBUSB20_MAX_FRAME_PRE_SCALE;
 179                 pre_scale = 1;
 180         } else {
 181                 pre_scale = 0;
 182         }
 183         if (MaxFrameCount == 0)
 184                 return (LIBUSB20_ERROR_INVALID_PARAM);
 185
 186         xfer->maxFrames = MaxFrameCount;
 187
 188         size = MaxFrameCount * sizeof(xfer->pLength[0]);
 189         xfer->pLength = malloc(size);
 190         if (xfer->pLength == NULL) {
 191                 return (LIBUSB20_ERROR_NO_MEM);
 192         }
 193         memset(xfer->pLength, 0, size);
 194
 195         size = MaxFrameCount * sizeof(xfer->ppBuffer[0]);
 196         xfer->ppBuffer = malloc(size);
 197         if (xfer->ppBuffer == NULL) {
 198                 free(xfer->pLength);
 199                 return (LIBUSB20_ERROR_NO_MEM);
 200         }
 201         memset(xfer->ppBuffer, 0, size);
 202
 203         error = xfer->pdev->methods->tr_open(xfer, MaxBufSize,
 204             MaxFrameCount, ep_no, stream_id, pre_scale);
 205
 206         if (error) {
 207                 free(xfer->ppBuffer);
 208                 free(xfer->pLength);
 209         } else {
 210                 xfer->is_opened = 1;
 211         }
 212         return (error);
 213 }
 214
 215 struct libusb20_transfer *
 216 libusb20_tr_get_pointer(struct libusb20_device *pdev, uint16_t trIndex)
 217 {
 218         if (trIndex >= pdev->nTransfer) {
 219                 return (NULL);
 220         }
 221         return (pdev->pTransfer + trIndex);
 222 }
 223
 224 uint32_t
 225 libusb20_tr_get_actual_frames(struct libusb20_transfer *xfer)
 226 {
 227         return (xfer->aFrames);
 228 }
 229
 230 uint16_t
 231 libusb20_tr_get_time_complete(struct libusb20_transfer *xfer)
 232 {
 233         return (xfer->timeComplete);
 234 }
 235
 236 uint32_t
 237 libusb20_tr_get_actual_length(struct libusb20_transfer *xfer)
 238 {
 239         uint32_t x;
 240         uint32_t actlen = 0;
 241
 242         for (x = 0; x != xfer->aFrames; x++) {
 243                 actlen += xfer->pLength[x];
 244         }
 245         return (actlen);
 246 }
 247
 248 uint32_t
 249 libusb20_tr_get_max_frames(struct libusb20_transfer *xfer)
 250 {
 251         return (xfer->maxFrames);
 252 }
 253
 254 uint32_t
 255 libusb20_tr_get_max_packet_length(struct libusb20_transfer *xfer)
 256 {
 257         /*
 258          * Special Case NOTE: If the packet multiplier is non-zero for
 259          * High Speed USB, the value returned is equal to
 260          * "wMaxPacketSize * multiplier" !
 261          */
 262         return (xfer->maxPacketLen);
 263 }
 264
 265 uint32_t
 266 libusb20_tr_get_max_total_length(struct libusb20_transfer *xfer)
 267 {
 268         return (xfer->maxTotalLength);
 269 }
 270
 271 uint8_t
 272 libusb20_tr_get_status(struct libusb20_transfer *xfer)
 273 {
 274         return (xfer->status);
 275 }
 276
 277 uint8_t
 278 libusb20_tr_pending(struct libusb20_transfer *xfer)
 279 {
 280         return (xfer->is_pending);
 281 }
 282
 283 void   *
 284 libusb20_tr_get_priv_sc0(struct libusb20_transfer *xfer)
 285 {
 286         return (xfer->priv_sc0);
 287 }
 288
 289 void   *
 290 libusb20_tr_get_priv_sc1(struct libusb20_transfer *xfer)
 291 {
 292         return (xfer->priv_sc1);
 293 }
 294
 295 void
 296 libusb20_tr_stop(struct libusb20_transfer *xfer)
 297 {
 298         if (!xfer->is_opened) {
 299                 /* transfer is not opened */
 300                 return;
 301         }
 302         if (!xfer->is_pending) {
 303                 /* transfer not pending */
 304                 return;
 305         }
 306         if (xfer->is_cancel) {
 307                 /* already cancelling */
 308                 return;
 309         }
 310         xfer->is_cancel = 1;            /* we are cancelling */
 311
 312         xfer->pdev->methods->tr_cancel_async(xfer);
 313         return;
 314 }
 315
 316 void
 317 libusb20_tr_drain(struct libusb20_transfer *xfer)
 318 {
 319         if (!xfer->is_opened) {
 320                 /* transfer is not opened */
 321                 return;
 322         }
 323         /* make sure that we are cancelling */
 324         libusb20_tr_stop(xfer);
 325
 326         if (xfer->is_pending) {
 327                 xfer->is_draining = 1;
 328         }
 329         return;
 330 }
 331
 332 void
 333 libusb20_tr_clear_stall_sync(struct libusb20_transfer *xfer)
 334 {
 335         xfer->pdev->methods->tr_clear_stall_sync(xfer);
 336         return;
 337 }
 338
 339 void
 340 libusb20_tr_set_buffer(struct libusb20_transfer *xfer, void *buffer, uint16_t frIndex)
 341 {
 342         xfer->ppBuffer[frIndex] = libusb20_pass_ptr(buffer);
 343         return;
 344 }
 345
 346 void
 347 libusb20_tr_set_callback(struct libusb20_transfer *xfer, libusb20_tr_callback_t *cb)
 348 {
 349         xfer->callback = cb;
 350         return;
 351 }
 352
 353 void
 354 libusb20_tr_set_flags(struct libusb20_transfer *xfer, uint8_t flags)
 355 {
 356         xfer->flags = flags;
 357         return;
 358 }
 359
 360 uint32_t
 361 libusb20_tr_get_length(struct libusb20_transfer *xfer, uint16_t frIndex)
 362 {
 363         return (xfer->pLength[frIndex]);
 364 }
 365
 366 void
 367 libusb20_tr_set_length(struct libusb20_transfer *xfer, uint32_t length, uint16_t frIndex)
 368 {
 369         xfer->pLength[frIndex] = length;
 370         return;
 371 }
 372
 373 void
 374 libusb20_tr_set_priv_sc0(struct libusb20_transfer *xfer, void *sc0)
 375 {
 376         xfer->priv_sc0 = sc0;
 377         return;
 378 }
 379
 380 void
 381 libusb20_tr_set_priv_sc1(struct libusb20_transfer *xfer, void *sc1)
 382 {
 383         xfer->priv_sc1 = sc1;
 384         return;
 385 }
 386
 387 void
 388 libusb20_tr_set_timeout(struct libusb20_transfer *xfer, uint32_t timeout)
 389 {
 390         xfer->timeout = timeout;
 391         return;
 392 }
 393
 394 void
 395 libusb20_tr_set_total_frames(struct libusb20_transfer *xfer, uint32_t nFrames)
 396 {
 397         if (nFrames > xfer->maxFrames) {
 398                 /* should not happen */
 399                 nFrames = xfer->maxFrames;
 400         }
 401         xfer->nFrames = nFrames;
 402         return;
 403 }
 404
 405 void
 406 libusb20_tr_setup_bulk(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
 407 {
 408         xfer->ppBuffer[0] = libusb20_pass_ptr(pBuf);
 409         xfer->pLength[0] = length;
 410         xfer->timeout = timeout;
 411         xfer->nFrames = 1;
 412         return;
 413 }
 414
 415 void
 416 libusb20_tr_setup_control(struct libusb20_transfer *xfer, void *psetup, void *pBuf, uint32_t timeout)
 417 {
 418         uint16_t len;
 419
 420         xfer->ppBuffer[0] = libusb20_pass_ptr(psetup);
 421         xfer->pLength[0] = 8;           /* fixed */
 422         xfer->timeout = timeout;
 423
 424         len = ((uint8_t *)psetup)[6] | (((uint8_t *)psetup)[7] << 8);
 425
 426         if (len != 0) {
 427                 xfer->nFrames = 2;
 428                 xfer->ppBuffer[1] = libusb20_pass_ptr(pBuf);
 429                 xfer->pLength[1] = len;
 430         } else {
 431                 xfer->nFrames = 1;
 432         }
 433         return;
 434 }
 435
 436 void
 437 libusb20_tr_setup_intr(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint32_t timeout)
 438 {
 439         xfer->ppBuffer[0] = libusb20_pass_ptr(pBuf);
 440         xfer->pLength[0] = length;
 441         xfer->timeout = timeout;
 442         xfer->nFrames = 1;
 443         return;
 444 }
 445
 446 void
 447 libusb20_tr_setup_isoc(struct libusb20_transfer *xfer, void *pBuf, uint32_t length, uint16_t frIndex)
 448 {
 449         if (frIndex >= xfer->maxFrames) {
 450                 /* should not happen */
 451                 return;
 452         }
 453         xfer->ppBuffer[frIndex] = libusb20_pass_ptr(pBuf);
 454         xfer->pLength[frIndex] = length;
 455         return;
 456 }
 457
 458 uint8_t
 459 libusb20_tr_bulk_intr_sync(struct libusb20_transfer *xfer,
 460     void *pbuf, uint32_t length, uint32_t *pactlen,
 461     uint32_t timeout)
 462 {
 463         struct libusb20_device *pdev = xfer->pdev;
 464         uint32_t transfer_max;
 465         uint32_t transfer_act;
 466         uint8_t retval;
 467
 468         /* set some sensible default value */
 469         if (pactlen != NULL)
 470                 *pactlen = 0;
 471
 472         /* check for error condition */
 473         if (libusb20_tr_pending(xfer))
 474                 return (LIBUSB20_ERROR_OTHER);
 475
 476         do {
 477                 /* compute maximum transfer length */
 478                 transfer_max =
 479                     libusb20_tr_get_max_total_length(xfer);
 480
 481                 if (transfer_max > length)
 482                         transfer_max = length;
 483
 484                 /* setup bulk or interrupt transfer */
 485                 libusb20_tr_setup_bulk(xfer, pbuf,
 486                     transfer_max, timeout);
 487
 488                 /* start the transfer */
 489                 libusb20_tr_start(xfer);
 490
 491                 /* wait for transfer completion */
 492                 while (libusb20_dev_process(pdev) == 0) {
 493
 494                         if (libusb20_tr_pending(xfer) == 0)
 495                                 break;
 496
 497                         libusb20_dev_wait_process(pdev, -1);
 498                 }
 499
 500                 transfer_act = libusb20_tr_get_actual_length(xfer);
 501
 502                 /* update actual length, if any */
 503                 if (pactlen != NULL)
 504                         pactlen[0] += transfer_act;
 505
 506                 /* check transfer status */
 507                 retval = libusb20_tr_get_status(xfer);
 508                 if (retval)
 509                         break;
 510
 511                 /* check for short transfer */
 512                 if (transfer_act != transfer_max)
 513                         break;
 514
 515                 /* update buffer pointer and length */
 516                 pbuf = ((uint8_t *)pbuf) + transfer_max;
 517                 length = length - transfer_max;
 518
 519         } while (length != 0);
 520
 521         return (retval);
 522 }
 523
 524 void
 525 libusb20_tr_submit(struct libusb20_transfer *xfer)
 526 {
 527         if (!xfer->is_opened) {
 528                 /* transfer is not opened */
 529                 return;
 530         }
 531         if (xfer->is_pending) {
 532                 /* should not happen */
 533                 return;
 534         }
 535         xfer->is_pending = 1;           /* we are pending */
 536         xfer->is_cancel = 0;            /* not cancelling */
 537         xfer->is_restart = 0;           /* not restarting */
 538
 539         xfer->pdev->methods->tr_submit(xfer);
 540         return;
 541 }
 542
 543 void
 544 libusb20_tr_start(struct libusb20_transfer *xfer)
 545 {
 546         if (!xfer->is_opened) {
 547                 /* transfer is not opened */
 548                 return;
 549         }
 550         if (xfer->is_pending) {
 551                 if (xfer->is_cancel) {
 552                         /* cancelling - restart */
 553                         xfer->is_restart = 1;
 554                 }
 555                 /* transfer not pending */
 556                 return;
 557         }
 558         /* get into the callback */
 559         libusb20_tr_callback_wrapper(xfer);
 560         return;
 561 }
 562
 563 /* USB device operations */
 564
 565 int
 566 libusb20_dev_close(struct libusb20_device *pdev)
 567 {
 568         struct libusb20_transfer *xfer;
 569         uint16_t x;
 570         int error = 0;
 571
 572         if (!pdev->is_opened) {
 573                 return (LIBUSB20_ERROR_OTHER);
 574         }
 575         for (x = 0; x != pdev->nTransfer; x++) {
 576                 xfer = pdev->pTransfer + x;
 577
 578                 if (!xfer->is_opened) {
 579                         /* transfer is not opened */
 580                         continue;
 581                 }
 582
 583                 libusb20_tr_drain(xfer);
 584
 585                 libusb20_tr_close(xfer);
 586         }
 587
 588         if (pdev->pTransfer != NULL) {
 589                 free(pdev->pTransfer);
 590                 pdev->pTransfer = NULL;
 591         }
 592         error = pdev->beMethods->close_device(pdev);
 593
 594         pdev->methods = &libusb20_dummy_methods;
 595
 596         pdev->is_opened = 0;
 597
 598         /*
 599          * The following variable is only used by the libusb v0.1
 600          * compat layer:
 601          */
 602         pdev->claimed_interface = 0;
 603
 604         return (error);
 605 }
 606
 607 int
 608 libusb20_dev_detach_kernel_driver(struct libusb20_device *pdev, uint8_t ifaceIndex)
 609 {
 610         int error;
 611
 612         error = pdev->methods->detach_kernel_driver(pdev, ifaceIndex);
 613         return (error);
 614 }
 615
 616 struct LIBUSB20_DEVICE_DESC_DECODED *
 617 libusb20_dev_get_device_desc(struct libusb20_device *pdev)
 618 {
 619         return (&(pdev->ddesc));
 620 }
 621
 622 int
 623 libusb20_dev_get_fd(struct libusb20_device *pdev)
 624 {
 625         return (pdev->file);
 626 }
 627
 628 int
 629 libusb20_dev_kernel_driver_active(struct libusb20_device *pdev, uint8_t ifaceIndex)
 630 {
 631         int error;
 632
 633         error = pdev->methods->kernel_driver_active(pdev, ifaceIndex);
 634         return (error);
 635 }
 636
 637 int
 638 libusb20_dev_open(struct libusb20_device *pdev, uint16_t nTransferMax)
 639 {
 640         struct libusb20_transfer *xfer;
 641         uint32_t size;
 642         uint16_t x;
 643         int error;
 644
 645         if (pdev->is_opened) {
 646                 return (LIBUSB20_ERROR_BUSY);
 647         }
 648         if (nTransferMax >= 256) {
 649                 return (LIBUSB20_ERROR_INVALID_PARAM);
 650         } else if (nTransferMax != 0) {
 651                 size = sizeof(pdev->pTransfer[0]) * nTransferMax;
 652                 pdev->pTransfer = malloc(size);
 653                 if (pdev->pTransfer == NULL) {
 654                         return (LIBUSB20_ERROR_NO_MEM);
 655                 }
 656                 memset(pdev->pTransfer, 0, size);
 657         }
 658         /* initialise all transfers */
 659         for (x = 0; x != nTransferMax; x++) {
 660
 661                 xfer = pdev->pTransfer + x;
 662
 663                 xfer->pdev = pdev;
 664                 xfer->trIndex = x;
 665                 xfer->callback = &dummy_callback;
 666         }
 667
 668         /* set "nTransfer" early */
 669         pdev->nTransfer = nTransferMax;
 670
 671         error = pdev->beMethods->open_device(pdev, nTransferMax);
 672
 673         if (error) {
 674                 if (pdev->pTransfer != NULL) {
 675                         free(pdev->pTransfer);
 676                         pdev->pTransfer = NULL;
 677                 }
 678                 pdev->file = -1;
 679                 pdev->file_ctrl = -1;
 680                 pdev->nTransfer = 0;
 681         } else {
 682                 pdev->is_opened = 1;
 683         }
 684         return (error);
 685 }
 686
 687 int
 688 libusb20_dev_reset(struct libusb20_device *pdev)
 689 {
 690         int error;
 691
 692         error = pdev->methods->reset_device(pdev);
 693         return (error);
 694 }
 695
 696 int
 697 libusb20_dev_check_connected(struct libusb20_device *pdev)
 698 {
 699         int error;
 700
 701         error = pdev->methods->check_connected(pdev);
 702         return (error);
 703 }
 704
 705 int
 706 libusb20_dev_set_power_mode(struct libusb20_device *pdev, uint8_t power_mode)
 707 {
 708         int error;
 709
 710         error = pdev->methods->set_power_mode(pdev, power_mode);
 711         return (error);
 712 }
 713
 714 uint8_t
 715 libusb20_dev_get_power_mode(struct libusb20_device *pdev)
 716 {
 717         int error;
 718         uint8_t power_mode;
 719
 720         error = pdev->methods->get_power_mode(pdev, &power_mode);
 721         if (error)
 722                 power_mode = LIBUSB20_POWER_ON; /* fake power mode */
 723         return (power_mode);
 724 }
 725
 726 int
 727 libusb20_dev_get_port_path(struct libusb20_device *pdev, uint8_t *buf, uint8_t bufsize)
 728 {
 729         return (pdev->methods->get_port_path(pdev, buf, bufsize));
 730 }
 731
 732 uint16_t
 733 libusb20_dev_get_power_usage(struct libusb20_device *pdev)
 734 {
 735         int error;
 736         uint16_t power_usage;
 737
 738         error = pdev->methods->get_power_usage(pdev, &power_usage);
 739         if (error)
 740                 power_usage = 0;
 741         return (power_usage);
 742 }
 743
 744 int
 745 libusb20_dev_set_alt_index(struct libusb20_device *pdev, uint8_t ifaceIndex, uint8_t altIndex)
 746 {
 747         int error;
 748
 749         error = pdev->methods->set_alt_index(pdev, ifaceIndex, altIndex);
 750         return (error);
 751 }
 752
 753 int
 754 libusb20_dev_set_config_index(struct libusb20_device *pdev, uint8_t configIndex)
 755 {
 756         int error;
 757
 758         error = pdev->methods->set_config_index(pdev, configIndex);
 759         return (error);
 760 }
 761
 762 int
 763 libusb20_dev_request_sync(struct libusb20_device *pdev,
 764     struct LIBUSB20_CONTROL_SETUP_DECODED *setup, void *data,
 765     uint16_t *pactlen, uint32_t timeout, uint8_t flags)
 766 {
 767         int error;
 768
 769         error = pdev->methods->do_request_sync(pdev,
 770             setup, data, pactlen, timeout, flags);
 771         return (error);
 772 }
 773
 774 int
 775 libusb20_dev_req_string_sync(struct libusb20_device *pdev,
 776     uint8_t str_index, uint16_t langid, void *ptr, uint16_t len)
 777 {
 778         struct LIBUSB20_CONTROL_SETUP_DECODED req;
 779         int error;
 780
 781         /* make sure memory is initialised */
 782         memset(ptr, 0, len);
 783
 784         if (len < 4) {
 785                 /* invalid length */
 786                 return (LIBUSB20_ERROR_INVALID_PARAM);
 787         }
 788         LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
 789
 790         /*
 791          * We need to read the USB string in two steps else some USB
 792          * devices will complain.
 793          */
 794         req.bmRequestType =
 795             LIBUSB20_REQUEST_TYPE_STANDARD |
 796             LIBUSB20_RECIPIENT_DEVICE |
 797             LIBUSB20_ENDPOINT_IN;
 798         req.bRequest = LIBUSB20_REQUEST_GET_DESCRIPTOR;
 799         req.wValue = (LIBUSB20_DT_STRING << 8) | str_index;
 800         req.wIndex = langid;
 801         req.wLength = 4;                /* bytes */
 802
 803         error = libusb20_dev_request_sync(pdev, &req,
 804             ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
 805         if (error) {
 806                 return (error);
 807         }
 808         req.wLength = *(uint8_t *)ptr;  /* bytes */
 809         if (req.wLength > len) {
 810                 /* partial string read */
 811                 req.wLength = len;
 812         }
 813         error = libusb20_dev_request_sync(pdev, &req,
 814             ptr, NULL, 1000, LIBUSB20_TRANSFER_SINGLE_SHORT_NOT_OK);
 815
 816         if (error) {
 817                 return (error);
 818         }
 819         if (((uint8_t *)ptr)[1] != LIBUSB20_DT_STRING) {
 820                 return (LIBUSB20_ERROR_OTHER);
 821         }
 822         return (0);                     /* success */
 823 }
 824
 825 int
 826 libusb20_dev_req_string_simple_sync(struct libusb20_device *pdev,
 827     uint8_t str_index, void *ptr, uint16_t len)
 828 {
 829         char *buf;
 830         int error;
 831         uint16_t langid;
 832         uint16_t n;
 833         uint16_t i;
 834         uint16_t c;
 835         uint8_t temp[255];
 836         uint8_t swap;
 837
 838         /* the following code derives from the FreeBSD USB kernel */
 839
 840         if ((len < 1) || (ptr == NULL)) {
 841                 /* too short buffer */
 842                 return (LIBUSB20_ERROR_INVALID_PARAM);
 843         }
 844         error = libusb20_dev_req_string_sync(pdev,
 845             0, 0, temp, sizeof(temp));
 846         if (error < 0) {
 847                 *(uint8_t *)ptr = 0;    /* zero terminate */
 848                 return (error);
 849         }
 850         langid = temp[2] | (temp[3] << 8);
 851
 852         error = libusb20_dev_req_string_sync(pdev, str_index,
 853             langid, temp, sizeof(temp));
 854         if (error < 0) {
 855                 *(uint8_t *)ptr = 0;    /* zero terminate */
 856                 return (error);
 857         }
 858         if (temp[0] < 2) {
 859                 /* string length is too short */
 860                 *(uint8_t *)ptr = 0;    /* zero terminate */
 861                 return (LIBUSB20_ERROR_OTHER);
 862         }
 863         /* reserve one byte for terminating zero */
 864         len--;
 865
 866         /* find maximum length */
 867         n = (temp[0] / 2) - 1;
 868         if (n > len) {
 869                 n = len;
 870         }
 871         /* reset swap state */
 872         swap = 3;
 873
 874         /* setup output buffer pointer */
 875         buf = ptr;
 876
 877         /* convert and filter */
 878         for (i = 0; (i != n); i++) {
 879                 c = temp[(2 * i) + 2] | (temp[(2 * i) + 3] << 8);
 880
 881                 /* convert from Unicode, handle buggy strings */
 882                 if (((c & 0xff00) == 0) && (swap & 1)) {
 883                         /* Little Endian, default */
 884                         *buf = c;
 885                         swap = 1;
 886                 } else if (((c & 0x00ff) == 0) && (swap & 2)) {
 887                         /* Big Endian */
 888                         *buf = c >> 8;
 889                         swap = 2;
 890                 } else {
 891                         /* skip invalid character */
 892                         continue;
 893                 }
 894                 /*
 895                  * Filter by default - we don't allow greater and less than
 896                  * signs because they might confuse the dmesg printouts!
 897                  */
 898                 if ((*buf == '<') || (*buf == '>') || (!isprint(*buf))) {
 899                         /* skip invalid character */
 900                         continue;
 901                 }
 902                 buf++;
 903         }
 904         *buf = 0;                       /* zero terminate string */
 905
 906         return (0);
 907 }
 908
 909 struct libusb20_config *
 910 libusb20_dev_alloc_config(struct libusb20_device *pdev, uint8_t configIndex)
 911 {
 912         struct libusb20_config *retval = NULL;
 913         uint8_t *ptr;
 914         uint16_t len;
 915         uint8_t do_close;
 916         int error;
 917
 918         if (!pdev->is_opened) {
 919                 error = libusb20_dev_open(pdev, 0);
 920                 if (error) {
 921                         return (NULL);
 922                 }
 923                 do_close = 1;
 924         } else {
 925                 do_close = 0;
 926         }
 927         error = pdev->methods->get_config_desc_full(pdev,
 928             &ptr, &len, configIndex);
 929
 930         if (error) {
 931                 goto done;
 932         }
 933         /* parse new config descriptor */
 934         retval = libusb20_parse_config_desc(ptr);
 935
 936         /* free config descriptor */
 937         free(ptr);
 938
 939 done:
 940         if (do_close) {
 941                 error = libusb20_dev_close(pdev);
 942         }
 943         return (retval);
 944 }
 945
 946 struct libusb20_device *
 947 libusb20_dev_alloc(void)
 948 {
 949         struct libusb20_device *pdev;
 950
 951         pdev = malloc(sizeof(*pdev));
 952         if (pdev == NULL) {
 953                 return (NULL);
 954         }
 955         memset(pdev, 0, sizeof(*pdev));
 956
 957         pdev->file = -1;
 958         pdev->file_ctrl = -1;
 959         pdev->methods = &libusb20_dummy_methods;
 960         return (pdev);
 961 }
 962
 963 uint8_t
 964 libusb20_dev_get_config_index(struct libusb20_device *pdev)
 965 {
 966         int error;
 967         uint8_t cfg_index;
 968         uint8_t do_close;
 969
 970         if (!pdev->is_opened) {
 971                 error = libusb20_dev_open(pdev, 0);
 972                 if (error == 0) {
 973                         do_close = 1;
 974                 } else {
 975                         do_close = 0;
 976                 }
 977         } else {
 978                 do_close = 0;
 979         }
 980
 981         error = pdev->methods->get_config_index(pdev, &cfg_index);
 982         if (error)
 983                 cfg_index = 0xFF;       /* current config index */
 984         if (do_close) {
 985                 if (libusb20_dev_close(pdev)) {
 986                         /* ignore */
 987                 }
 988         }
 989         return (cfg_index);
 990 }
 991
 992 uint8_t
 993 libusb20_dev_get_mode(struct libusb20_device *pdev)
 994 {
 995         return (pdev->usb_mode);
 996 }
 997
 998 uint8_t
 999 libusb20_dev_get_speed(struct libusb20_device *pdev)
1000 {
1001         return (pdev->usb_speed);
1002 }
1003
1004 /* if this function returns an error, the device is gone */
1005 int
1006 libusb20_dev_process(struct libusb20_device *pdev)
1007 {
1008         int error;
1009
1010         error = pdev->methods->process(pdev);
1011         return (error);
1012 }
1013
1014 void
1015 libusb20_dev_wait_process(struct libusb20_device *pdev, int timeout)
1016 {
1017         struct pollfd pfd[1];
1018
1019         if (!pdev->is_opened) {
1020                 return;
1021         }
1022         pfd[0].fd = pdev->file;
1023         pfd[0].events = (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM);
1024         pfd[0].revents = 0;
1025
1026         if (poll(pfd, 1, timeout)) {
1027                 /* ignore any error */
1028         }
1029         return;
1030 }
1031
1032 void
1033 libusb20_dev_free(struct libusb20_device *pdev)
1034 {
1035         if (pdev == NULL) {
1036                 /* be NULL safe */
1037                 return;
1038         }
1039         if (pdev->is_opened) {
1040                 if (libusb20_dev_close(pdev)) {
1041                         /* ignore any errors */
1042                 }
1043         }
1044         free(pdev);
1045         return;
1046 }
1047
1048 int
1049 libusb20_dev_get_info(struct libusb20_device *pdev,
1050     struct usb_device_info *pinfo)
1051 {
1052         if (pinfo == NULL)
1053                 return (LIBUSB20_ERROR_INVALID_PARAM);
1054
1055         return (pdev->beMethods->dev_get_info(pdev, pinfo));
1056 }
1057
1058 const char *
1059 libusb20_dev_get_backend_name(struct libusb20_device *pdev)
1060 {
1061         return (pdev->beMethods->get_backend_name());
1062 }
1063
1064 const char *
1065 libusb20_dev_get_desc(struct libusb20_device *pdev)
1066 {
1067         return (pdev->usb_desc);
1068 }
1069
1070 void
1071 libusb20_dev_set_debug(struct libusb20_device *pdev, int debug)
1072 {
1073         pdev->debug = debug;
1074         return;
1075 }
1076
1077 int
1078 libusb20_dev_get_debug(struct libusb20_device *pdev)
1079 {
1080         return (pdev->debug);
1081 }
1082
1083 uint8_t
1084 libusb20_dev_get_address(struct libusb20_device *pdev)
1085 {
1086         return (pdev->device_address);
1087 }
1088
1089 uint8_t
1090 libusb20_dev_get_parent_address(struct libusb20_device *pdev)
1091 {
1092         return (pdev->parent_address);
1093 }
1094
1095 uint8_t
1096 libusb20_dev_get_parent_port(struct libusb20_device *pdev)
1097 {
1098         return (pdev->parent_port);
1099 }
1100
1101 uint8_t
1102 libusb20_dev_get_bus_number(struct libusb20_device *pdev)
1103 {
1104         return (pdev->bus_number);
1105 }
1106
1107 int
1108 libusb20_dev_get_iface_desc(struct libusb20_device *pdev,
1109     uint8_t iface_index, char *buf, uint8_t len)
1110 {
1111         if ((buf == NULL) || (len == 0))
1112                 return (LIBUSB20_ERROR_INVALID_PARAM);
1113
1114         buf[0] = 0;             /* set default string value */
1115
1116         return (pdev->beMethods->dev_get_iface_desc(
1117             pdev, iface_index, buf, len));
1118 }
1119
1120 /* USB backend operations */
1121
1122 int
1123 libusb20_be_get_dev_quirk(struct libusb20_backend *pbe,
1124     uint16_t quirk_index, struct libusb20_quirk *pq)
1125 {
1126         return (pbe->methods->root_get_dev_quirk(pbe, quirk_index, pq));
1127 }
1128
1129 int
1130 libusb20_be_get_quirk_name(struct libusb20_backend *pbe,
1131     uint16_t quirk_index, struct libusb20_quirk *pq)
1132 {
1133         return (pbe->methods->root_get_quirk_name(pbe, quirk_index, pq));
1134 }
1135
1136 int
1137 libusb20_be_add_dev_quirk(struct libusb20_backend *pbe,
1138     struct libusb20_quirk *pq)
1139 {
1140         return (pbe->methods->root_add_dev_quirk(pbe, pq));
1141 }
1142
1143 int
1144 libusb20_be_remove_dev_quirk(struct libusb20_backend *pbe,
1145     struct libusb20_quirk *pq)
1146 {
1147         return (pbe->methods->root_remove_dev_quirk(pbe, pq));
1148 }
1149
1150 int
1151 libusb20_be_set_template(struct libusb20_backend *pbe, int temp)
1152 {
1153         return (pbe->methods->root_set_template(pbe, temp));
1154 }
1155
1156 int
1157 libusb20_be_get_template(struct libusb20_backend *pbe, int *ptemp)
1158 {
1159         int temp;
1160
1161         if (ptemp == NULL)
1162                 ptemp = &temp;
1163
1164         return (pbe->methods->root_get_template(pbe, ptemp));
1165 }
1166
1167 struct libusb20_device *
1168 libusb20_be_device_foreach(struct libusb20_backend *pbe, struct libusb20_device *pdev)
1169 {
1170         if (pbe == NULL) {
1171                 pdev = NULL;
1172         } else if (pdev == NULL) {
1173                 pdev = TAILQ_FIRST(&(pbe->usb_devs));
1174         } else {
1175                 pdev = TAILQ_NEXT(pdev, dev_entry);
1176         }
1177         return (pdev);
1178 }
1179
1180 struct libusb20_backend *
1181 libusb20_be_alloc(const struct libusb20_backend_methods *methods)
1182 {
1183         struct libusb20_backend *pbe;
1184
1185         pbe = malloc(sizeof(*pbe));
1186         if (pbe == NULL) {
1187                 return (NULL);
1188         }
1189         memset(pbe, 0, sizeof(*pbe));
1190
1191         TAILQ_INIT(&(pbe->usb_devs));
1192
1193         pbe->methods = methods;         /* set backend methods */
1194
1195         /* do the initial device scan */
1196         if (pbe->methods->init_backend) {
1197                 pbe->methods->init_backend(pbe);
1198         }
1199         return (pbe);
1200 }
1201
1202 struct libusb20_backend *
1203 libusb20_be_alloc_linux(void)
1204 {
1205         return (NULL);
1206 }
1207
1208 struct libusb20_backend *
1209 libusb20_be_alloc_ugen20(void)
1210 {
1211         return (libusb20_be_alloc(&libusb20_ugen20_backend));
1212 }
1213
1214 struct libusb20_backend *
1215 libusb20_be_alloc_default(void)
1216 {
1217         struct libusb20_backend *pbe;
1218
1219 #ifdef __linux__
1220         pbe = libusb20_be_alloc_linux();
1221         if (pbe) {
1222                 return (pbe);
1223         }
1224 #endif
1225         pbe = libusb20_be_alloc_ugen20();
1226         if (pbe) {
1227                 return (pbe);
1228         }
1229         return (NULL);                  /* no backend found */
1230 }
1231
1232 void
1233 libusb20_be_free(struct libusb20_backend *pbe)
1234 {
1235         struct libusb20_device *pdev;
1236
1237         if (pbe == NULL) {
1238                 /* be NULL safe */
1239                 return;
1240         }
1241         while ((pdev = libusb20_be_device_foreach(pbe, NULL))) {
1242                 libusb20_be_dequeue_device(pbe, pdev);
1243                 libusb20_dev_free(pdev);
1244         }
1245         if (pbe->methods->exit_backend) {
1246                 pbe->methods->exit_backend(pbe);
1247         }
1248         /* free backend */
1249         free(pbe);
1250 }
1251
1252 void
1253 libusb20_be_enqueue_device(struct libusb20_backend *pbe, struct libusb20_device *pdev)
1254 {
1255         pdev->beMethods = pbe->methods; /* copy backend methods */
1256         TAILQ_INSERT_TAIL(&(pbe->usb_devs), pdev, dev_entry);
1257 }
1258
1259 void
1260 libusb20_be_dequeue_device(struct libusb20_backend *pbe,
1261     struct libusb20_device *pdev)
1262 {
1263         TAILQ_REMOVE(&(pbe->usb_devs), pdev, dev_entry);
1264 }
1265
1266 const char *
1267 libusb20_strerror(int code)
1268 {
1269         switch (code) {
1270         case LIBUSB20_SUCCESS:
1271                 return ("Success");
1272         case LIBUSB20_ERROR_IO:
1273                 return ("I/O error");
1274         case LIBUSB20_ERROR_INVALID_PARAM:
1275                 return ("Invalid parameter");
1276         case LIBUSB20_ERROR_ACCESS:
1277                 return ("Permissions error");
1278         case LIBUSB20_ERROR_NO_DEVICE:
1279                 return ("No device");
1280         case LIBUSB20_ERROR_NOT_FOUND:
1281                 return ("Not found");
1282         case LIBUSB20_ERROR_BUSY:
1283                 return ("Device busy");
1284         case LIBUSB20_ERROR_TIMEOUT:
1285                 return ("Timeout");
1286         case LIBUSB20_ERROR_OVERFLOW:
1287                 return ("Overflow");
1288         case LIBUSB20_ERROR_PIPE:
1289                 return ("Pipe error");
1290         case LIBUSB20_ERROR_INTERRUPTED:
1291                 return ("Interrupted");
1292         case LIBUSB20_ERROR_NO_MEM:
1293                 return ("Out of memory");
1294         case LIBUSB20_ERROR_NOT_SUPPORTED:
1295                 return ("Not supported");
1296         case LIBUSB20_ERROR_OTHER:
1297                 return ("Other error");
1298         default:
1299                 return ("Unknown error");
1300         }
1301 }
1302
1303 const char *
1304 libusb20_error_name(int code)
1305 {
1306         switch (code) {
1307         case LIBUSB20_SUCCESS:
1308                 return ("LIBUSB20_SUCCESS");
1309         case LIBUSB20_ERROR_IO:
1310                 return ("LIBUSB20_ERROR_IO");
1311         case LIBUSB20_ERROR_INVALID_PARAM:
1312                 return ("LIBUSB20_ERROR_INVALID_PARAM");
1313         case LIBUSB20_ERROR_ACCESS:
1314                 return ("LIBUSB20_ERROR_ACCESS");
1315         case LIBUSB20_ERROR_NO_DEVICE:
1316                 return ("LIBUSB20_ERROR_NO_DEVICE");
1317         case LIBUSB20_ERROR_NOT_FOUND:
1318                 return ("LIBUSB20_ERROR_NOT_FOUND");
1319         case LIBUSB20_ERROR_BUSY:
1320                 return ("LIBUSB20_ERROR_BUSY");
1321         case LIBUSB20_ERROR_TIMEOUT:
1322                 return ("LIBUSB20_ERROR_TIMEOUT");
1323         case LIBUSB20_ERROR_OVERFLOW:
1324                 return ("LIBUSB20_ERROR_OVERFLOW");
1325         case LIBUSB20_ERROR_PIPE:
1326                 return ("LIBUSB20_ERROR_PIPE");
1327         case LIBUSB20_ERROR_INTERRUPTED:
1328                 return ("LIBUSB20_ERROR_INTERRUPTED");
1329         case LIBUSB20_ERROR_NO_MEM:
1330                 return ("LIBUSB20_ERROR_NO_MEM");
1331         case LIBUSB20_ERROR_NOT_SUPPORTED:
1332                 return ("LIBUSB20_ERROR_NOT_SUPPORTED");
1333         case LIBUSB20_ERROR_OTHER:
1334                 return ("LIBUSB20_ERROR_OTHER");
1335         default:
1336                 return ("LIBUSB20_ERROR_UNKNOWN");
1337         }
1338 }