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                         dev->speed = di.udi_speed;
 169
 170                         dpriv = (struct device_priv *)dev->os_priv;
 171                         strlcpy(dpriv->devnode, devnode, sizeof(devnode));
 172                         dpriv->fd = -1;
 173
 174                         if (ioctl(fd, USB_GET_DEVICE_DESC, &dpriv->ddesc) < 0) {
 175                                 err = errno;
 176                                 goto error;
 177                         }
 178
 179                         dpriv->cdesc = NULL;
 180                         if (_cache_active_config_descriptor(dev, fd)) {
 181                                 err = errno;
 182                                 goto error;
 183                         }
 184
 185                         if ((err = usbi_sanitize_device(dev)))
 186                                 goto error;
 187                 }
 188                 close(fd);
 189
 190                 if (discovered_devs_append(*discdevs, dev) == NULL)
 191                         return (LIBUSB_ERROR_NO_MEM);
 192         }
 193
 194         return (LIBUSB_SUCCESS);
 195
 196 error:
 197         close(fd);
 198         libusb_unref_device(dev);
 199         return _errno_to_libusb(err);
 200 }
 201
 202 int
 203 obsd_open(struct libusb_device_handle *handle)
 204 {
 205         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 206         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 207
 208         dpriv->fd = open(dpriv->devnode, O_RDWR);
 209         if (dpriv->fd < 0) {
 210                 dpriv->fd = open(dpriv->devnode, O_RDONLY);
 211                 if (dpriv->fd < 0)
 212                         return _errno_to_libusb(errno);
 213         }
 214
 215         usbi_dbg("open %s: fd %d", dpriv->devnode, dpriv->fd);
 216
 217         if (pipe(hpriv->pipe) < 0)
 218                 return _errno_to_libusb(errno);
 219
 220         return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->pipe[0], POLLIN);
 221 }
 222
 223 void
 224 obsd_close(struct libusb_device_handle *handle)
 225 {
 226         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 227         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 228
 229         usbi_dbg("close: fd %d", dpriv->fd);
 230
 231         close(dpriv->fd);
 232         dpriv->fd = -1;
 233
 234         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 235
 236         close(hpriv->pipe[0]);
 237         close(hpriv->pipe[1]);
 238 }
 239
 240 int
 241 obsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
 242     int *host_endian)
 243 {
 244         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 245
 246         usbi_dbg("");
 247
 248         memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);
 249
 250         *host_endian = 0;
 251
 252         return (LIBUSB_SUCCESS);
 253 }
 254
 255 int
 256 obsd_get_active_config_descriptor(struct libusb_device *dev,
 257     unsigned char *buf, size_t len, int *host_endian)
 258 {
 259         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 260         usb_config_descriptor_t *ucd;
 261
 262         ucd = (usb_config_descriptor_t *) dpriv->cdesc;
 263         len = MIN(len, UGETW(ucd->wTotalLength));
 264
 265         usbi_dbg("len %d", len);
 266
 267         memcpy(buf, dpriv->cdesc, len);
 268
 269         *host_endian = 0;
 270
 271         return (LIBUSB_SUCCESS);
 272 }
 273
 274 int
 275 obsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
 276     unsigned char *buf, size_t len, int *host_endian)
 277 {
 278         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 279         struct usb_full_desc ufd;
 280         int fd, err;
 281
 282         usbi_dbg("index %d, len %d", idx, len);
 283
 284         /* A config descriptor may be requested before opening the device */
 285         if (dpriv->fd >= 0) {
 286                 fd = dpriv->fd;
 287         } else {
 288                 fd = open(dpriv->devnode, O_RDONLY);
 289                 if (fd < 0)
 290                         return _errno_to_libusb(errno);
 291         }
 292
 293         ufd.ufd_config_index = idx;
 294         ufd.ufd_size = len;
 295         ufd.ufd_data = buf;
 296
 297         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 298                 err = errno;
 299                 if (dpriv->fd < 0)
 300                         close(fd);
 301                 return _errno_to_libusb(err);
 302         }
 303
 304         if (dpriv->fd < 0)
 305                 close(fd);
 306
 307         *host_endian = 0;
 308
 309         return (LIBUSB_SUCCESS);
 310 }
 311
 312 int
 313 obsd_get_configuration(struct libusb_device_handle *handle, int *config)
 314 {
 315         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 316
 317         usbi_dbg("");
 318
 319         if (ioctl(dpriv->fd, USB_GET_CONFIG, config) < 0)
 320                 return _errno_to_libusb(errno);
 321
 322         usbi_dbg("configuration %d", *config);
 323
 324         return (LIBUSB_SUCCESS);
 325 }
 326
 327 int
 328 obsd_set_configuration(struct libusb_device_handle *handle, int config)
 329 {
 330         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 331
 332         usbi_dbg("configuration %d", config);
 333
 334         if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
 335                 return _errno_to_libusb(errno);
 336
 337         return _cache_active_config_descriptor(handle->dev, dpriv->fd);
 338 }
 339
 340 int
 341 obsd_claim_interface(struct libusb_device_handle *handle, int iface)
 342 {
 343         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 344         int i;
 345
 346         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 347                 hpriv->endpoints[i] = -1;
 348
 349         return (LIBUSB_SUCCESS);
 350 }
 351
 352 int
 353 obsd_release_interface(struct libusb_device_handle *handle, int iface)
 354 {
 355         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 356         int i;
 357
 358         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 359                 if (hpriv->endpoints[i] >= 0)
 360                         close(hpriv->endpoints[i]);
 361
 362         return (LIBUSB_SUCCESS);
 363 }
 364
 365 int
 366 obsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
 367     int altsetting)
 368 {
 369         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 370         struct usb_alt_interface intf;
 371
 372         usbi_dbg("iface %d, setting %d", iface, altsetting);
 373
 374         memset(&intf, 0, sizeof(intf));
 375
 376         intf.uai_interface_index = iface;
 377         intf.uai_alt_no = altsetting;
 378
 379         if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
 380                 return _errno_to_libusb(errno);
 381
 382         return (LIBUSB_SUCCESS);
 383 }
 384
 385 int
 386 obsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
 387 {
 388         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 389         struct usb_ctl_request req;
 390
 391         usbi_dbg("");
 392
 393         req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
 394         req.ucr_request.bRequest = UR_CLEAR_FEATURE;
 395         USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
 396         USETW(req.ucr_request.wIndex, endpoint);
 397         USETW(req.ucr_request.wLength, 0);
 398
 399         if (ioctl(dpriv->fd, USB_DO_REQUEST, &req) < 0)
 400                 return _errno_to_libusb(errno);
 401
 402         return (LIBUSB_SUCCESS);
 403 }
 404
 405 int
 406 obsd_reset_device(struct libusb_device_handle *handle)
 407 {
 408         usbi_dbg("");
 409
 410         return (LIBUSB_ERROR_NOT_SUPPORTED);
 411 }
 412
 413 void
 414 obsd_destroy_device(struct libusb_device *dev)
 415 {
 416         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 417
 418         usbi_dbg("");
 419
 420         free(dpriv->cdesc);
 421 }
 422
 423 int
 424 obsd_submit_transfer(struct usbi_transfer *itransfer)
 425 {
 426         struct libusb_transfer *transfer;
 427         struct handle_priv *hpriv;
 428         int err = 0;
 429
 430         usbi_dbg("");
 431
 432         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 433         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 434
 435         switch (transfer->type) {
 436         case LIBUSB_TRANSFER_TYPE_CONTROL:
 437                 err = _sync_control_transfer(itransfer);
 438                 break;
 439         case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
 440                 if (IS_XFEROUT(transfer)) {
 441                         /* Isochronous write is not supported */
 442                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 443                         break;
 444                 }
 445                 err = _sync_gen_transfer(itransfer);
 446                 break;
 447         case LIBUSB_TRANSFER_TYPE_BULK:
 448         case LIBUSB_TRANSFER_TYPE_INTERRUPT:
 449                 if (IS_XFEROUT(transfer) &&
 450                     transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
 451                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 452                         break;
 453                 }
 454                 err = _sync_gen_transfer(itransfer);
 455                 break;
 456         }
 457
 458         if (err)
 459                 return (err);
 460
 461         if (write(hpriv->pipe[1], &itransfer, sizeof(itransfer)) < 0)
 462                 return _errno_to_libusb(errno);
 463
 464         return (LIBUSB_SUCCESS);
 465 }
 466
 467 int
 468 obsd_cancel_transfer(struct usbi_transfer *itransfer)
 469 {
 470         usbi_dbg("");
 471
 472         return (LIBUSB_ERROR_NOT_SUPPORTED);
 473 }
 474
 475 void
 476 obsd_clear_transfer_priv(struct usbi_transfer *itransfer)
 477 {
 478         usbi_dbg("");
 479
 480         /* Nothing to do */
 481 }
 482
 483 int
 484 obsd_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds,
 485     int num_ready)
 486 {
 487         struct libusb_device_handle *handle;
 488         struct handle_priv *hpriv = NULL;
 489         struct usbi_transfer *itransfer;
 490         struct pollfd *pollfd;
 491         int i, err = 0;
 492
 493         usbi_dbg("");
 494
 495         pthread_mutex_lock(&ctx->open_devs_lock);
 496         for (i = 0; i < nfds && num_ready > 0; i++) {
 497                 pollfd = &fds[i];
 498
 499                 if (!pollfd->revents)
 500                         continue;
 501
 502                 hpriv = NULL;
 503                 num_ready--;
 504                 list_for_each_entry(handle, &ctx->open_devs, list,
 505                     struct libusb_device_handle) {
 506                         hpriv = (struct handle_priv *)handle->os_priv;
 507
 508                         if (hpriv->pipe[0] == pollfd->fd)
 509                                 break;
 510
 511                         hpriv = NULL;
 512                 }
 513
 514                 if (NULL == hpriv) {
 515                         usbi_dbg("fd %d is not an event pipe!", pollfd->fd);
 516                         err = ENOENT;
 517                         break;
 518                 }
 519
 520                 if (pollfd->revents & POLLERR) {
 521                         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 522                         usbi_handle_disconnect(handle);
 523                         continue;
 524                 }
 525
 526                 if (read(hpriv->pipe[0], &itransfer, sizeof(itransfer)) < 0) {
 527                         err = errno;
 528                         break;
 529                 }
 530
 531                 if ((err = usbi_handle_transfer_completion(itransfer,
 532                     LIBUSB_TRANSFER_COMPLETED)))
 533                         break;
 534         }
 535         pthread_mutex_unlock(&ctx->open_devs_lock);
 536
 537         if (err)
 538                 return _errno_to_libusb(err);
 539
 540         return (LIBUSB_SUCCESS);
 541 }
 542
 543 int
 544 obsd_clock_gettime(int clkid, struct timespec *tp)
 545 {
 546         usbi_dbg("clock %d", clkid);
 547
 548         if (clkid == USBI_CLOCK_REALTIME)
 549                 return clock_gettime(CLOCK_REALTIME, tp);
 550
 551         if (clkid == USBI_CLOCK_MONOTONIC)
 552                 return clock_gettime(CLOCK_MONOTONIC, tp);
 553
 554         return (LIBUSB_ERROR_INVALID_PARAM);
 555 }
 556
 557 int
 558 _errno_to_libusb(int err)
 559 {
 560         switch (err) {
 561         case EIO:
 562                 return (LIBUSB_ERROR_IO);
 563         case EACCES:
 564                 return (LIBUSB_ERROR_ACCESS);
 565         case ENOENT:
 566                 return (LIBUSB_ERROR_NO_DEVICE);
 567         case ENOMEM:
 568                 return (LIBUSB_ERROR_NO_MEM);
 569         }
 570
 571         usbi_dbg("error: %s", strerror(err));
 572
 573         return (LIBUSB_ERROR_OTHER);
 574 }
 575
 576 int
 577 _cache_active_config_descriptor(struct libusb_device *dev, int fd)
 578 {
 579         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 580         struct usb_config_desc ucd;
 581         struct usb_full_desc ufd;
 582         unsigned char* buf;
 583         int len;
 584
 585         usbi_dbg("fd %d", fd);
 586
 587         ucd.ucd_config_index = USB_CURRENT_CONFIG_INDEX;
 588
 589         if ((ioctl(fd, USB_GET_CONFIG_DESC, &ucd)) < 0)
 590                 return _errno_to_libusb(errno);
 591
 592         usbi_dbg("active bLength %d", ucd.ucd_desc.bLength);
 593
 594         len = UGETW(ucd.ucd_desc.wTotalLength);
 595         buf = malloc(len);
 596         if (buf == NULL)
 597                 return (LIBUSB_ERROR_NO_MEM);
 598
 599         ufd.ufd_config_index = ucd.ucd_config_index;
 600         ufd.ufd_size = len;
 601         ufd.ufd_data = buf;
 602
 603         usbi_dbg("index %d, len %d", ufd.ufd_config_index, len);
 604
 605         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 606                 free(buf);
 607                 return _errno_to_libusb(errno);
 608         }
 609
 610         if (dpriv->cdesc)
 611                 free(dpriv->cdesc);
 612         dpriv->cdesc = buf;
 613
 614         return (0);
 615 }
 616
 617 int
 618 _sync_control_transfer(struct usbi_transfer *itransfer)
 619 {
 620         struct libusb_transfer *transfer;
 621         struct libusb_control_setup *setup;
 622         struct device_priv *dpriv;
 623         struct usb_ctl_request req;
 624
 625         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 626         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 627         setup = (struct libusb_control_setup *)transfer->buffer;
 628
 629         usbi_dbg("type %d request %d value %d index %d length %d timeout %d",
 630             setup->bmRequestType, setup->bRequest,
 631             libusb_le16_to_cpu(setup->wValue),
 632             libusb_le16_to_cpu(setup->wIndex),
 633             libusb_le16_to_cpu(setup->wLength), transfer->timeout);
 634
 635         req.ucr_request.bmRequestType = setup->bmRequestType;
 636         req.ucr_request.bRequest = setup->bRequest;
 637         /* Don't use USETW, libusbx already deals with the endianness */
 638         (*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
 639         (*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
 640         (*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
 641         req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
 642
 643         if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 644                 req.ucr_flags = USBD_SHORT_XFER_OK;
 645
 646         if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 647                 return _errno_to_libusb(errno);
 648
 649         if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
 650                 return _errno_to_libusb(errno);
 651
 652         itransfer->transferred = req.ucr_actlen;
 653
 654         usbi_dbg("transferred %d", itransfer->transferred);
 655
 656         return (0);
 657 }
 658
 659 int
 660 _access_endpoint(struct libusb_transfer *transfer)
 661 {
 662         struct handle_priv *hpriv;
 663         struct device_priv *dpriv;
 664         char *s, devnode[16];
 665         int fd, endpt;
 666         mode_t mode;
 667
 668         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 669         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 670
 671         endpt = UE_GET_ADDR(transfer->endpoint);
 672         mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;
 673
 674         usbi_dbg("endpoint %d mode %d", endpt, mode);
 675
 676         if (hpriv->endpoints[endpt] < 0) {
 677                 /* Pick the right node given the control one */
 678                 strlcpy(devnode, dpriv->devnode, sizeof(devnode));
 679                 s = strchr(devnode, '.');
 680                 snprintf(s, 4, ".%02d", endpt);
 681
 682                 /* We may need to read/write to the same endpoint later. */
 683                 if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
 684                         if ((fd = open(devnode, mode)) < 0)
 685                                 return (-1);
 686
 687                 hpriv->endpoints[endpt] = fd;
 688         }
 689
 690         return (hpriv->endpoints[endpt]);
 691 }
 692
 693 int
 694 _sync_gen_transfer(struct usbi_transfer *itransfer)
 695 {
 696         struct libusb_transfer *transfer;
 697         int fd, nr = 1;
 698
 699         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 700
 701         /*
 702          * Bulk, Interrupt or Isochronous transfer depends on the
 703          * endpoint and thus the node to open.
 704          */
 705         if ((fd = _access_endpoint(transfer)) < 0)
 706                 return _errno_to_libusb(errno);
 707
 708         if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 709                 return _errno_to_libusb(errno);
 710
 711         if (IS_XFERIN(transfer)) {
 712                 if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 713                         if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
 714                                 return _errno_to_libusb(errno);
 715
 716                 nr = read(fd, transfer->buffer, transfer->length);
 717         } else {
 718                 nr = write(fd, transfer->buffer, transfer->length);
 719         }
 720
 721         if (nr < 0)
 722                 return _errno_to_libusb(errno);
 723
 724         itransfer->transferred = nr;
 725
 726         return (0);
 727 }