libusb/os/openbsd_usb.c

   1 /*
   2  * Copyright © 2011 Martin Pieuchot <mpi@openbsd.org>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include <sys/time.h>
  20 #include <sys/types.h>
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28
  29 #include <dev/usb/usb.h>
  30
  31 #include "libusb.h"
  32 #include "libusbi.h"
  33
  34 struct device_priv {
  35         char devnode[16];
  36         int fd;
  37
  38         unsigned char *cdesc;                   /* active config descriptor */
  39         usb_device_descriptor_t ddesc;          /* usb device descriptor */
  40 };
  41
  42 struct handle_priv {
  43         int pipe[2];                            /* for event notification */
  44         int endpoints[USB_MAX_ENDPOINTS];
  45 };
  46
  47 /*
  48  * Backend functions
  49  */
  50 static int obsd_get_device_list(struct libusb_context *,
  51     struct discovered_devs **);
  52 static int obsd_open(struct libusb_device_handle *);
  53 static void obsd_close(struct libusb_device_handle *);
  54
  55 static int obsd_get_device_descriptor(struct libusb_device *, unsigned char *,
  56     int *);
  57 static int obsd_get_active_config_descriptor(struct libusb_device *,
  58     unsigned char *, size_t, int *);
  59 static int obsd_get_config_descriptor(struct libusb_device *, uint8_t,
  60     unsigned char *, size_t, int *);
  61
  62 static int obsd_get_configuration(struct libusb_device_handle *, int *);
  63 static int obsd_set_configuration(struct libusb_device_handle *, int);
  64
  65 static int obsd_claim_interface(struct libusb_device_handle *, int);
  66 static int obsd_release_interface(struct libusb_device_handle *, int);
  67
  68 static int obsd_set_interface_altsetting(struct libusb_device_handle *, int,
  69     int);
  70 static int obsd_clear_halt(struct libusb_device_handle *, unsigned char);
  71 static int obsd_reset_device(struct libusb_device_handle *);
  72 static void obsd_destroy_device(struct libusb_device *);
  73
  74 static int obsd_submit_transfer(struct usbi_transfer *);
  75 static int obsd_cancel_transfer(struct usbi_transfer *);
  76 static void obsd_clear_transfer_priv(struct usbi_transfer *);
  77 static int obsd_handle_events(struct libusb_context *ctx, struct pollfd *,
  78     nfds_t, int);
  79 static int obsd_clock_gettime(int, struct timespec *);
  80
  81 /*
  82  * Private functions
  83  */
  84 static int _errno_to_libusb(int);
  85 static int _cache_active_config_descriptor(struct libusb_device *, int);
  86 static int _sync_control_transfer(struct usbi_transfer *);
  87 static int _sync_gen_transfer(struct usbi_transfer *);
  88 static int _access_endpoint(struct libusb_transfer *);
  89
  90 const struct usbi_os_backend openbsd_backend = {
  91         "Synchronous OpenBSD backend",
  92         NULL,                           /* init() */
  93         NULL,                           /* exit() */
  94         obsd_get_device_list,
  95         obsd_open,
  96         obsd_close,
  97
  98         obsd_get_device_descriptor,
  99         obsd_get_active_config_descriptor,
 100         obsd_get_config_descriptor,
 101
 102         obsd_get_configuration,
 103         obsd_set_configuration,
 104
 105         obsd_claim_interface,
 106         obsd_release_interface,
 107
 108         obsd_set_interface_altsetting,
 109         obsd_clear_halt,
 110         obsd_reset_device,
 111
 112         NULL,                           /* kernel_driver_active() */
 113         NULL,                           /* detach_kernel_driver() */
 114         NULL,                           /* attach_kernel_driver() */
 115
 116         obsd_destroy_device,
 117
 118         obsd_submit_transfer,
 119         obsd_cancel_transfer,
 120         obsd_clear_transfer_priv,
 121
 122         obsd_handle_events,
 123
 124         obsd_clock_gettime,
 125         sizeof(struct device_priv),
 126         sizeof(struct handle_priv),
 127         0,                              /* transfer_priv_size */
 128         0,                              /* add_iso_packet_size */
 129 };
 130
 131 int
 132 obsd_get_device_list(struct libusb_context * ctx,
 133         struct discovered_devs **discdevs)
 134 {
 135         struct libusb_device *dev;
 136         struct device_priv *dpriv;
 137         struct usb_device_info di;
 138         unsigned long session_id;
 139         char devnode[16];
 140         int fd, err, i;
 141
 142         usbi_dbg("");
 143
 144         /* Only ugen(4) is supported */
 145         for (i = 0; i < USB_MAX_DEVICES; i++) {
 146                 /* Control endpoint is always .00 */
 147                 snprintf(devnode, sizeof(devnode), "/dev/ugen%d.00", i);
 148
 149                 if ((fd = open(devnode, O_RDONLY)) < 0) {
 150                         if (errno != ENOENT && errno != ENXIO)
 151                                 usbi_err(ctx, "could not open %s", devnode);
 152                         continue;
 153                 }
 154
 155                 if (ioctl(fd, USB_GET_DEVICEINFO, &di) < 0)
 156                         continue;
 157
 158                 session_id = (di.udi_bus << 8 | di.udi_addr);
 159                 dev = usbi_get_device_by_session_id(ctx, session_id);
 160
 161                 if (dev == NULL) {
 162                         dev = usbi_alloc_device(ctx, session_id);
 163                         if (dev == NULL)
 164                                 return (LIBUSB_ERROR_NO_MEM);
 165
 166                         dev->bus_number = di.udi_bus;
 167                         dev->device_address = di.udi_addr;
 168
 169                         dpriv = (struct device_priv *)dev->os_priv;
 170                         strlcpy(dpriv->devnode, devnode, sizeof(devnode));
 171                         dpriv->fd = -1;
 172
 173                         if (ioctl(fd, USB_GET_DEVICE_DESC, &dpriv->ddesc) < 0) {
 174                                 err = errno;
 175                                 goto error;
 176                         }
 177
 178                         dpriv->cdesc = NULL;
 179                         if (_cache_active_config_descriptor(dev, fd)) {
 180                                 err = errno;
 181                                 goto error;
 182                         }
 183
 184                         if ((err = usbi_sanitize_device(dev)))
 185                                 goto error;
 186                 }
 187                 close(fd);
 188
 189                 if (discovered_devs_append(*discdevs, dev) == NULL)
 190                         return (LIBUSB_ERROR_NO_MEM);
 191         }
 192
 193         return (LIBUSB_SUCCESS);
 194
 195 error:
 196         close(fd);
 197         libusb_unref_device(dev);
 198         return _errno_to_libusb(err);
 199 }
 200
 201 int
 202 obsd_open(struct libusb_device_handle *handle)
 203 {
 204         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 205         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 206
 207         dpriv->fd = open(dpriv->devnode, O_RDWR);
 208         if (dpriv->fd < 0) {
 209                 dpriv->fd = open(dpriv->devnode, O_RDONLY);
 210                 if (dpriv->fd < 0)
 211                         return _errno_to_libusb(errno);
 212         }
 213
 214         usbi_dbg("open %s: fd %d", dpriv->devnode, dpriv->fd);
 215
 216         if (pipe(hpriv->pipe) < 0)
 217                 return _errno_to_libusb(errno);
 218
 219         return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->pipe[0], POLLIN);
 220 }
 221
 222 void
 223 obsd_close(struct libusb_device_handle *handle)
 224 {
 225         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 226         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 227
 228         usbi_dbg("close: fd %d", dpriv->fd);
 229
 230         close(dpriv->fd);
 231         dpriv->fd = -1;
 232
 233         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 234
 235         close(hpriv->pipe[0]);
 236         close(hpriv->pipe[1]);
 237 }
 238
 239 int
 240 obsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
 241     int *host_endian)
 242 {
 243         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 244
 245         usbi_dbg("");
 246
 247         memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);
 248
 249         *host_endian = 0;
 250
 251         return (LIBUSB_SUCCESS);
 252 }
 253
 254 int
 255 obsd_get_active_config_descriptor(struct libusb_device *dev,
 256     unsigned char *buf, size_t len, int *host_endian)
 257 {
 258         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 259         usb_config_descriptor_t *ucd;
 260
 261         ucd = (usb_config_descriptor_t *) dpriv->cdesc;
 262         len = MIN(len, UGETW(ucd->wTotalLength));
 263
 264         usbi_dbg("len %d", len);
 265
 266         memcpy(buf, dpriv->cdesc, len);
 267
 268         *host_endian = 0;
 269
 270         return (LIBUSB_SUCCESS);
 271 }
 272
 273 int
 274 obsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
 275     unsigned char *buf, size_t len, int *host_endian)
 276 {
 277         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 278         struct usb_full_desc ufd;
 279         int fd, err;
 280
 281         usbi_dbg("index %d, len %d", idx, len);
 282
 283         /* A config descriptor may be requested before opening the device */
 284         if (dpriv->fd >= 0) {
 285                 fd = dpriv->fd;
 286         } else {
 287                 fd = open(dpriv->devnode, O_RDONLY);
 288                 if (fd < 0)
 289                         return _errno_to_libusb(errno);
 290         }
 291
 292         ufd.ufd_config_index = idx;
 293         ufd.ufd_size = len;
 294         ufd.ufd_data = buf;
 295
 296         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 297                 err = errno;
 298                 if (dpriv->fd < 0)
 299                         close(fd);
 300                 return _errno_to_libusb(err);
 301         }
 302
 303         if (dpriv->fd < 0)
 304                 close(fd);
 305
 306         *host_endian = 0;
 307
 308         return (LIBUSB_SUCCESS);
 309 }
 310
 311 int
 312 obsd_get_configuration(struct libusb_device_handle *handle, int *config)
 313 {
 314         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 315
 316         usbi_dbg("");
 317
 318         if (ioctl(dpriv->fd, USB_GET_CONFIG, config) < 0)
 319                 return _errno_to_libusb(errno);
 320
 321         usbi_dbg("configuration %d", *config);
 322
 323         return (LIBUSB_SUCCESS);
 324 }
 325
 326 int
 327 obsd_set_configuration(struct libusb_device_handle *handle, int config)
 328 {
 329         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 330
 331         usbi_dbg("configuration %d", config);
 332
 333         if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
 334                 return _errno_to_libusb(errno);
 335
 336         return _cache_active_config_descriptor(handle->dev, dpriv->fd);
 337 }
 338
 339 int
 340 obsd_claim_interface(struct libusb_device_handle *handle, int iface)
 341 {
 342         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 343         int i;
 344
 345         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 346                 hpriv->endpoints[i] = -1;
 347
 348         return (LIBUSB_SUCCESS);
 349 }
 350
 351 int
 352 obsd_release_interface(struct libusb_device_handle *handle, int iface)
 353 {
 354         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 355         int i;
 356
 357         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 358                 if (hpriv->endpoints[i] >= 0)
 359                         close(hpriv->endpoints[i]);
 360
 361         return (LIBUSB_SUCCESS);
 362 }
 363
 364 int
 365 obsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
 366     int altsetting)
 367 {
 368         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 369         struct usb_alt_interface intf;
 370
 371         usbi_dbg("iface %d, setting %d", iface, altsetting);
 372
 373         memset(&intf, 0, sizeof(intf));
 374
 375         intf.uai_interface_index = iface;
 376         intf.uai_alt_no = altsetting;
 377
 378         if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
 379                 return _errno_to_libusb(errno);
 380
 381         return (LIBUSB_SUCCESS);
 382 }
 383
 384 int
 385 obsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
 386 {
 387         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 388         struct usb_ctl_request req;
 389
 390         usbi_dbg("");
 391
 392         req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
 393         req.ucr_request.bRequest = UR_CLEAR_FEATURE;
 394         USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
 395         USETW(req.ucr_request.wIndex, endpoint);
 396         USETW(req.ucr_request.wLength, 0);
 397
 398         if (ioctl(dpriv->fd, USB_DO_REQUEST, &req) < 0)
 399                 return _errno_to_libusb(errno);
 400
 401         return (LIBUSB_SUCCESS);
 402 }
 403
 404 int
 405 obsd_reset_device(struct libusb_device_handle *handle)
 406 {
 407         usbi_dbg("");
 408
 409         return (LIBUSB_ERROR_NOT_SUPPORTED);
 410 }
 411
 412 void
 413 obsd_destroy_device(struct libusb_device *dev)
 414 {
 415         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 416
 417         usbi_dbg("");
 418
 419         free(dpriv->cdesc);
 420 }
 421
 422 int
 423 obsd_submit_transfer(struct usbi_transfer *itransfer)
 424 {
 425         struct libusb_transfer *transfer;
 426         struct handle_priv *hpriv;
 427         int err = 0;
 428
 429         usbi_dbg("");
 430
 431         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 432         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 433
 434         switch (transfer->type) {
 435         case LIBUSB_TRANSFER_TYPE_CONTROL:
 436                 err = _sync_control_transfer(itransfer);
 437                 break;
 438         case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
 439                 if (IS_XFEROUT(transfer)) {
 440                         /* Isochronous write is not supported */
 441                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 442                         break;
 443                 }
 444                 err = _sync_gen_transfer(itransfer);
 445                 break;
 446         case LIBUSB_TRANSFER_TYPE_BULK:
 447         case LIBUSB_TRANSFER_TYPE_INTERRUPT:
 448                 if (IS_XFEROUT(transfer) &&
 449                     transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
 450                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 451                         break;
 452                 }
 453                 err = _sync_gen_transfer(itransfer);
 454                 break;
 455         }
 456
 457         if (err)
 458                 return (err);
 459
 460         if (write(hpriv->pipe[1], &itransfer, sizeof(itransfer)) < 0)
 461                 return _errno_to_libusb(errno);
 462
 463         return (LIBUSB_SUCCESS);
 464 }
 465
 466 int
 467 obsd_cancel_transfer(struct usbi_transfer *itransfer)
 468 {
 469         usbi_dbg("");
 470
 471         return (LIBUSB_ERROR_NOT_SUPPORTED);
 472 }
 473
 474 void
 475 obsd_clear_transfer_priv(struct usbi_transfer *itransfer)
 476 {
 477         usbi_dbg("");
 478
 479         /* Nothing to do */
 480 }
 481
 482 int
 483 obsd_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds,
 484     int num_ready)
 485 {
 486         struct libusb_device_handle *handle;
 487         struct handle_priv *hpriv;
 488         struct usbi_transfer *itransfer;
 489         struct pollfd *pollfd;
 490         int i, err = 0;
 491
 492         usbi_dbg("");
 493
 494         pthread_mutex_lock(&ctx->open_devs_lock);
 495         for (i = 0; i < nfds && num_ready > 0; i++) {
 496                 pollfd = &fds[i];
 497
 498                 if (!pollfd->revents)
 499                         continue;
 500
 501                 num_ready--;
 502                 list_for_each_entry(handle, &ctx->open_devs, list,
 503                     struct libusb_device_handle) {
 504                         hpriv = (struct handle_priv *)handle->os_priv;
 505
 506                         if (hpriv->pipe[0] == pollfd->fd)
 507                                 break;
 508                 }
 509
 510                 if (pollfd->revents & POLLERR) {
 511                         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 512                         usbi_handle_disconnect(handle);
 513                         continue;
 514                 }
 515
 516                 if (read(hpriv->pipe[0], &itransfer, sizeof(itransfer)) < 0) {
 517                         err = errno;
 518                         break;
 519                 }
 520
 521                 if ((err = usbi_handle_transfer_completion(itransfer,
 522                     LIBUSB_TRANSFER_COMPLETED)))
 523                         break;
 524         }
 525         pthread_mutex_unlock(&ctx->open_devs_lock);
 526
 527         if (err)
 528                 return _errno_to_libusb(err);
 529
 530         return (LIBUSB_SUCCESS);
 531 }
 532
 533 int
 534 obsd_clock_gettime(int clkid, struct timespec *tp)
 535 {
 536         usbi_dbg("clock %d", clkid);
 537
 538         if (clkid == USBI_CLOCK_REALTIME)
 539                 return clock_gettime(CLOCK_REALTIME, tp);
 540
 541         if (clkid == USBI_CLOCK_MONOTONIC)
 542                 return clock_gettime(CLOCK_MONOTONIC, tp);
 543
 544         return (LIBUSB_ERROR_INVALID_PARAM);
 545 }
 546
 547 int
 548 _errno_to_libusb(int err)
 549 {
 550         switch (err) {
 551         case EIO:
 552                 return (LIBUSB_ERROR_IO);
 553         case EACCES:
 554                 return (LIBUSB_ERROR_ACCESS);
 555         case ENOENT:
 556                 return (LIBUSB_ERROR_NO_DEVICE);
 557         case ENOMEM:
 558                 return (LIBUSB_ERROR_NO_MEM);
 559         }
 560
 561         usbi_dbg("error: %s", strerror(err));
 562
 563         return (LIBUSB_ERROR_OTHER);
 564 }
 565
 566 int
 567 _cache_active_config_descriptor(struct libusb_device *dev, int fd)
 568 {
 569         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 570         struct usb_config_desc ucd;
 571         struct usb_full_desc ufd;
 572         unsigned char* buf;
 573         int len;
 574
 575         usbi_dbg("fd %d", fd);
 576
 577         ucd.ucd_config_index = USB_CURRENT_CONFIG_INDEX;
 578
 579         if ((ioctl(fd, USB_GET_CONFIG_DESC, &ucd)) < 0)
 580                 return _errno_to_libusb(errno);
 581
 582         usbi_dbg("active bLength %d", ucd.ucd_desc.bLength);
 583
 584         len = UGETW(ucd.ucd_desc.wTotalLength);
 585         buf = malloc(len);
 586         if (buf == NULL)
 587                 return (LIBUSB_ERROR_NO_MEM);
 588
 589         ufd.ufd_config_index = ucd.ucd_config_index;
 590         ufd.ufd_size = len;
 591         ufd.ufd_data = buf;
 592
 593         usbi_dbg("index %d, len %d", ufd.ufd_config_index, len);
 594
 595         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 596                 free(buf);
 597                 return _errno_to_libusb(errno);
 598         }
 599
 600         if (dpriv->cdesc)
 601                 free(dpriv->cdesc);
 602         dpriv->cdesc = buf;
 603
 604         return (0);
 605 }
 606
 607 int
 608 _sync_control_transfer(struct usbi_transfer *itransfer)
 609 {
 610         struct libusb_transfer *transfer;
 611         struct libusb_control_setup *setup;
 612         struct device_priv *dpriv;
 613         struct usb_ctl_request req;
 614
 615         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 616         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 617         setup = (struct libusb_control_setup *)transfer->buffer;
 618
 619         usbi_dbg("type %d request %d value %d index %d length %d timeout %d",
 620             setup->bmRequestType, setup->bRequest,
 621             libusb_le16_to_cpu(setup->wValue),
 622             libusb_le16_to_cpu(setup->wIndex),
 623             libusb_le16_to_cpu(setup->wLength), transfer->timeout);
 624
 625         req.ucr_request.bmRequestType = setup->bmRequestType;
 626         req.ucr_request.bRequest = setup->bRequest;
 627         /* Don't use USETW, libusbx already deals with the endianness */
 628         (*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
 629         (*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
 630         (*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
 631         req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
 632
 633         if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 634                 req.ucr_flags = USBD_SHORT_XFER_OK;
 635
 636         if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 637                 return _errno_to_libusb(errno);
 638
 639         if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
 640                 return _errno_to_libusb(errno);
 641
 642         itransfer->transferred = req.ucr_actlen;
 643
 644         usbi_dbg("transferred %d", itransfer->transferred);
 645
 646         return (0);
 647 }
 648
 649 int
 650 _access_endpoint(struct libusb_transfer *transfer)
 651 {
 652         struct handle_priv *hpriv;
 653         struct device_priv *dpriv;
 654         char *s, devnode[16];
 655         int fd, endpt;
 656         mode_t mode;
 657
 658         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 659         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 660
 661         endpt = UE_GET_ADDR(transfer->endpoint);
 662         mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;
 663
 664         usbi_dbg("endpoint %d mode %d", endpt, mode);
 665
 666         if (hpriv->endpoints[endpt] < 0) {
 667                 /* Pick the right node given the control one */
 668                 strlcpy(devnode, dpriv->devnode, sizeof(devnode));
 669                 s = strchr(devnode, '.');
 670                 snprintf(s, 4, ".%02d", endpt);
 671
 672                 /* We may need to read/write to the same endpoint later. */
 673                 if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
 674                         if ((fd = open(devnode, mode)) < 0)
 675                                 return (-1);
 676
 677                 hpriv->endpoints[endpt] = fd;
 678         }
 679
 680         return (hpriv->endpoints[endpt]);
 681 }
 682
 683 int
 684 _sync_gen_transfer(struct usbi_transfer *itransfer)
 685 {
 686         struct libusb_transfer *transfer;
 687         int fd, nr = 1;
 688
 689         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 690
 691         /*
 692          * Bulk, Interrupt or Isochronous transfer depends on the
 693          * endpoint and thus the node to open.
 694          */
 695         if ((fd = _access_endpoint(transfer)) < 0)
 696                 return _errno_to_libusb(errno);
 697
 698         if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 699                 return _errno_to_libusb(errno);
 700
 701         if (IS_XFERIN(transfer)) {
 702                 if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 703                         if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
 704                                 return _errno_to_libusb(errno);
 705
 706                 nr = read(fd, transfer->buffer, transfer->length);
 707         } else {
 708                 nr = write(fd, transfer->buffer, transfer->length);
 709         }
 710
 711         if (nr < 0)
 712                 return _errno_to_libusb(errno);
 713
 714         itransfer->transferred = nr;
 715
 716         return (0);
 717 }