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         0,
  93         NULL,                           /* init() */
  94         NULL,                           /* exit() */
  95         obsd_get_device_list,
  96         obsd_open,
  97         obsd_close,
  98
  99         obsd_get_device_descriptor,
 100         obsd_get_active_config_descriptor,
 101         obsd_get_config_descriptor,
 102         NULL,                           /* get_config_descriptor_by_value() */
 103
 104         obsd_get_configuration,
 105         obsd_set_configuration,
 106
 107         obsd_claim_interface,
 108         obsd_release_interface,
 109
 110         obsd_set_interface_altsetting,
 111         obsd_clear_halt,
 112         obsd_reset_device,
 113
 114         NULL,                           /* kernel_driver_active() */
 115         NULL,                           /* detach_kernel_driver() */
 116         NULL,                           /* attach_kernel_driver() */
 117
 118         obsd_destroy_device,
 119
 120         obsd_submit_transfer,
 121         obsd_cancel_transfer,
 122         obsd_clear_transfer_priv,
 123
 124         obsd_handle_events,
 125
 126         obsd_clock_gettime,
 127         sizeof(struct device_priv),
 128         sizeof(struct handle_priv),
 129         0,                              /* transfer_priv_size */
 130         0,                              /* add_iso_packet_size */
 131 };
 132
 133 int
 134 obsd_get_device_list(struct libusb_context * ctx,
 135         struct discovered_devs **discdevs)
 136 {
 137         struct libusb_device *dev;
 138         struct device_priv *dpriv;
 139         struct usb_device_info di;
 140         unsigned long session_id;
 141         char devnode[16];
 142         int fd, err, i;
 143
 144         usbi_dbg("");
 145
 146         /* Only ugen(4) is supported */
 147         for (i = 0; i < USB_MAX_DEVICES; i++) {
 148                 /* Control endpoint is always .00 */
 149                 snprintf(devnode, sizeof(devnode), "/dev/ugen%d.00", i);
 150
 151                 if ((fd = open(devnode, O_RDONLY)) < 0) {
 152                         if (errno != ENOENT && errno != ENXIO)
 153                                 usbi_err(ctx, "could not open %s", devnode);
 154                         continue;
 155                 }
 156
 157                 if (ioctl(fd, USB_GET_DEVICEINFO, &di) < 0)
 158                         continue;
 159
 160                 session_id = (di.udi_bus << 8 | di.udi_addr);
 161                 dev = usbi_get_device_by_session_id(ctx, session_id);
 162
 163                 if (dev == NULL) {
 164                         dev = usbi_alloc_device(ctx, session_id);
 165                         if (dev == NULL)
 166                                 return (LIBUSB_ERROR_NO_MEM);
 167
 168                         dev->bus_number = di.udi_bus;
 169                         dev->device_address = di.udi_addr;
 170                         dev->speed = di.udi_speed;
 171
 172                         dpriv = (struct device_priv *)dev->os_priv;
 173                         strlcpy(dpriv->devnode, devnode, sizeof(devnode));
 174                         dpriv->fd = -1;
 175
 176                         if (ioctl(fd, USB_GET_DEVICE_DESC, &dpriv->ddesc) < 0) {
 177                                 err = errno;
 178                                 goto error;
 179                         }
 180
 181                         dpriv->cdesc = NULL;
 182                         if (_cache_active_config_descriptor(dev, fd)) {
 183                                 err = errno;
 184                                 goto error;
 185                         }
 186
 187                         if ((err = usbi_sanitize_device(dev)))
 188                                 goto error;
 189                 }
 190                 close(fd);
 191
 192                 if (discovered_devs_append(*discdevs, dev) == NULL)
 193                         return (LIBUSB_ERROR_NO_MEM);
 194         }
 195
 196         return (LIBUSB_SUCCESS);
 197
 198 error:
 199         close(fd);
 200         libusb_unref_device(dev);
 201         return _errno_to_libusb(err);
 202 }
 203
 204 int
 205 obsd_open(struct libusb_device_handle *handle)
 206 {
 207         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 208         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 209
 210         dpriv->fd = open(dpriv->devnode, O_RDWR);
 211         if (dpriv->fd < 0) {
 212                 dpriv->fd = open(dpriv->devnode, O_RDONLY);
 213                 if (dpriv->fd < 0)
 214                         return _errno_to_libusb(errno);
 215         }
 216
 217         usbi_dbg("open %s: fd %d", dpriv->devnode, dpriv->fd);
 218
 219         if (pipe(hpriv->pipe) < 0)
 220                 return _errno_to_libusb(errno);
 221
 222         return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->pipe[0], POLLIN);
 223 }
 224
 225 void
 226 obsd_close(struct libusb_device_handle *handle)
 227 {
 228         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 229         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 230
 231         usbi_dbg("close: fd %d", dpriv->fd);
 232
 233         close(dpriv->fd);
 234         dpriv->fd = -1;
 235
 236         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 237
 238         close(hpriv->pipe[0]);
 239         close(hpriv->pipe[1]);
 240 }
 241
 242 int
 243 obsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
 244     int *host_endian)
 245 {
 246         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 247
 248         usbi_dbg("");
 249
 250         memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);
 251
 252         *host_endian = 0;
 253
 254         return (LIBUSB_SUCCESS);
 255 }
 256
 257 int
 258 obsd_get_active_config_descriptor(struct libusb_device *dev,
 259     unsigned char *buf, size_t len, int *host_endian)
 260 {
 261         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 262         usb_config_descriptor_t *ucd;
 263
 264         ucd = (usb_config_descriptor_t *) dpriv->cdesc;
 265         len = MIN(len, UGETW(ucd->wTotalLength));
 266
 267         usbi_dbg("len %d", len);
 268
 269         memcpy(buf, dpriv->cdesc, len);
 270
 271         *host_endian = 0;
 272
 273         return len;
 274 }
 275
 276 int
 277 obsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
 278     unsigned char *buf, size_t len, int *host_endian)
 279 {
 280         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 281         struct usb_full_desc ufd;
 282         int fd, err;
 283
 284         usbi_dbg("index %d, len %d", idx, len);
 285
 286         /* A config descriptor may be requested before opening the device */
 287         if (dpriv->fd >= 0) {
 288                 fd = dpriv->fd;
 289         } else {
 290                 fd = open(dpriv->devnode, O_RDONLY);
 291                 if (fd < 0)
 292                         return _errno_to_libusb(errno);
 293         }
 294
 295         ufd.ufd_config_index = idx;
 296         ufd.ufd_size = len;
 297         ufd.ufd_data = buf;
 298
 299         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 300                 err = errno;
 301                 if (dpriv->fd < 0)
 302                         close(fd);
 303                 return _errno_to_libusb(err);
 304         }
 305
 306         if (dpriv->fd < 0)
 307                 close(fd);
 308
 309         *host_endian = 0;
 310
 311         return len;
 312 }
 313
 314 int
 315 obsd_get_configuration(struct libusb_device_handle *handle, int *config)
 316 {
 317         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 318
 319         usbi_dbg("");
 320
 321         if (ioctl(dpriv->fd, USB_GET_CONFIG, config) < 0)
 322                 return _errno_to_libusb(errno);
 323
 324         usbi_dbg("configuration %d", *config);
 325
 326         return (LIBUSB_SUCCESS);
 327 }
 328
 329 int
 330 obsd_set_configuration(struct libusb_device_handle *handle, int config)
 331 {
 332         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 333
 334         usbi_dbg("configuration %d", config);
 335
 336         if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
 337                 return _errno_to_libusb(errno);
 338
 339         return _cache_active_config_descriptor(handle->dev, dpriv->fd);
 340 }
 341
 342 int
 343 obsd_claim_interface(struct libusb_device_handle *handle, int iface)
 344 {
 345         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 346         int i;
 347
 348         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 349                 hpriv->endpoints[i] = -1;
 350
 351         return (LIBUSB_SUCCESS);
 352 }
 353
 354 int
 355 obsd_release_interface(struct libusb_device_handle *handle, int iface)
 356 {
 357         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 358         int i;
 359
 360         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 361                 if (hpriv->endpoints[i] >= 0)
 362                         close(hpriv->endpoints[i]);
 363
 364         return (LIBUSB_SUCCESS);
 365 }
 366
 367 int
 368 obsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
 369     int altsetting)
 370 {
 371         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 372         struct usb_alt_interface intf;
 373
 374         usbi_dbg("iface %d, setting %d", iface, altsetting);
 375
 376         memset(&intf, 0, sizeof(intf));
 377
 378         intf.uai_interface_index = iface;
 379         intf.uai_alt_no = altsetting;
 380
 381         if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
 382                 return _errno_to_libusb(errno);
 383
 384         return (LIBUSB_SUCCESS);
 385 }
 386
 387 int
 388 obsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
 389 {
 390         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 391         struct usb_ctl_request req;
 392
 393         usbi_dbg("");
 394
 395         req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
 396         req.ucr_request.bRequest = UR_CLEAR_FEATURE;
 397         USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
 398         USETW(req.ucr_request.wIndex, endpoint);
 399         USETW(req.ucr_request.wLength, 0);
 400
 401         if (ioctl(dpriv->fd, USB_DO_REQUEST, &req) < 0)
 402                 return _errno_to_libusb(errno);
 403
 404         return (LIBUSB_SUCCESS);
 405 }
 406
 407 int
 408 obsd_reset_device(struct libusb_device_handle *handle)
 409 {
 410         usbi_dbg("");
 411
 412         return (LIBUSB_ERROR_NOT_SUPPORTED);
 413 }
 414
 415 void
 416 obsd_destroy_device(struct libusb_device *dev)
 417 {
 418         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 419
 420         usbi_dbg("");
 421
 422         free(dpriv->cdesc);
 423 }
 424
 425 int
 426 obsd_submit_transfer(struct usbi_transfer *itransfer)
 427 {
 428         struct libusb_transfer *transfer;
 429         struct handle_priv *hpriv;
 430         int err = 0;
 431
 432         usbi_dbg("");
 433
 434         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 435         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 436
 437         switch (transfer->type) {
 438         case LIBUSB_TRANSFER_TYPE_CONTROL:
 439                 err = _sync_control_transfer(itransfer);
 440                 break;
 441         case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
 442                 if (IS_XFEROUT(transfer)) {
 443                         /* Isochronous write is not supported */
 444                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 445                         break;
 446                 }
 447                 err = _sync_gen_transfer(itransfer);
 448                 break;
 449         case LIBUSB_TRANSFER_TYPE_BULK:
 450         case LIBUSB_TRANSFER_TYPE_INTERRUPT:
 451                 if (IS_XFEROUT(transfer) &&
 452                     transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
 453                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 454                         break;
 455                 }
 456                 err = _sync_gen_transfer(itransfer);
 457                 break;
 458         }
 459
 460         if (err)
 461                 return (err);
 462
 463         if (write(hpriv->pipe[1], &itransfer, sizeof(itransfer)) < 0)
 464                 return _errno_to_libusb(errno);
 465
 466         return (LIBUSB_SUCCESS);
 467 }
 468
 469 int
 470 obsd_cancel_transfer(struct usbi_transfer *itransfer)
 471 {
 472         usbi_dbg("");
 473
 474         return (LIBUSB_ERROR_NOT_SUPPORTED);
 475 }
 476
 477 void
 478 obsd_clear_transfer_priv(struct usbi_transfer *itransfer)
 479 {
 480         usbi_dbg("");
 481
 482         /* Nothing to do */
 483 }
 484
 485 int
 486 obsd_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds,
 487     int num_ready)
 488 {
 489         struct libusb_device_handle *handle;
 490         struct handle_priv *hpriv = NULL;
 491         struct usbi_transfer *itransfer;
 492         struct pollfd *pollfd;
 493         int i, err = 0;
 494
 495         usbi_dbg("");
 496
 497         pthread_mutex_lock(&ctx->open_devs_lock);
 498         for (i = 0; i < nfds && num_ready > 0; i++) {
 499                 pollfd = &fds[i];
 500
 501                 if (!pollfd->revents)
 502                         continue;
 503
 504                 hpriv = NULL;
 505                 num_ready--;
 506                 list_for_each_entry(handle, &ctx->open_devs, list,
 507                     struct libusb_device_handle) {
 508                         hpriv = (struct handle_priv *)handle->os_priv;
 509
 510                         if (hpriv->pipe[0] == pollfd->fd)
 511                                 break;
 512
 513                         hpriv = NULL;
 514                 }
 515
 516                 if (NULL == hpriv) {
 517                         usbi_dbg("fd %d is not an event pipe!", pollfd->fd);
 518                         err = ENOENT;
 519                         break;
 520                 }
 521
 522                 if (pollfd->revents & POLLERR) {
 523                         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 524                         usbi_handle_disconnect(handle);
 525                         continue;
 526                 }
 527
 528                 if (read(hpriv->pipe[0], &itransfer, sizeof(itransfer)) < 0) {
 529                         err = errno;
 530                         break;
 531                 }
 532
 533                 if ((err = usbi_handle_transfer_completion(itransfer,
 534                     LIBUSB_TRANSFER_COMPLETED)))
 535                         break;
 536         }
 537         pthread_mutex_unlock(&ctx->open_devs_lock);
 538
 539         if (err)
 540                 return _errno_to_libusb(err);
 541
 542         return (LIBUSB_SUCCESS);
 543 }
 544
 545 int
 546 obsd_clock_gettime(int clkid, struct timespec *tp)
 547 {
 548         usbi_dbg("clock %d", clkid);
 549
 550         if (clkid == USBI_CLOCK_REALTIME)
 551                 return clock_gettime(CLOCK_REALTIME, tp);
 552
 553         if (clkid == USBI_CLOCK_MONOTONIC)
 554                 return clock_gettime(CLOCK_MONOTONIC, tp);
 555
 556         return (LIBUSB_ERROR_INVALID_PARAM);
 557 }
 558
 559 int
 560 _errno_to_libusb(int err)
 561 {
 562         switch (err) {
 563         case EIO:
 564                 return (LIBUSB_ERROR_IO);
 565         case EACCES:
 566                 return (LIBUSB_ERROR_ACCESS);
 567         case ENOENT:
 568                 return (LIBUSB_ERROR_NO_DEVICE);
 569         case ENOMEM:
 570                 return (LIBUSB_ERROR_NO_MEM);
 571         }
 572
 573         usbi_dbg("error: %s", strerror(err));
 574
 575         return (LIBUSB_ERROR_OTHER);
 576 }
 577
 578 int
 579 _cache_active_config_descriptor(struct libusb_device *dev, int fd)
 580 {
 581         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 582         struct usb_config_desc ucd;
 583         struct usb_full_desc ufd;
 584         unsigned char* buf;
 585         int len;
 586
 587         usbi_dbg("fd %d", fd);
 588
 589         ucd.ucd_config_index = USB_CURRENT_CONFIG_INDEX;
 590
 591         if ((ioctl(fd, USB_GET_CONFIG_DESC, &ucd)) < 0)
 592                 return _errno_to_libusb(errno);
 593
 594         usbi_dbg("active bLength %d", ucd.ucd_desc.bLength);
 595
 596         len = UGETW(ucd.ucd_desc.wTotalLength);
 597         buf = malloc(len);
 598         if (buf == NULL)
 599                 return (LIBUSB_ERROR_NO_MEM);
 600
 601         ufd.ufd_config_index = ucd.ucd_config_index;
 602         ufd.ufd_size = len;
 603         ufd.ufd_data = buf;
 604
 605         usbi_dbg("index %d, len %d", ufd.ufd_config_index, len);
 606
 607         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 608                 free(buf);
 609                 return _errno_to_libusb(errno);
 610         }
 611
 612         if (dpriv->cdesc)
 613                 free(dpriv->cdesc);
 614         dpriv->cdesc = buf;
 615
 616         return (0);
 617 }
 618
 619 int
 620 _sync_control_transfer(struct usbi_transfer *itransfer)
 621 {
 622         struct libusb_transfer *transfer;
 623         struct libusb_control_setup *setup;
 624         struct device_priv *dpriv;
 625         struct usb_ctl_request req;
 626
 627         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 628         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 629         setup = (struct libusb_control_setup *)transfer->buffer;
 630
 631         usbi_dbg("type %d request %d value %d index %d length %d timeout %d",
 632             setup->bmRequestType, setup->bRequest,
 633             libusb_le16_to_cpu(setup->wValue),
 634             libusb_le16_to_cpu(setup->wIndex),
 635             libusb_le16_to_cpu(setup->wLength), transfer->timeout);
 636
 637         req.ucr_request.bmRequestType = setup->bmRequestType;
 638         req.ucr_request.bRequest = setup->bRequest;
 639         /* Don't use USETW, libusbx already deals with the endianness */
 640         (*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
 641         (*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
 642         (*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
 643         req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
 644
 645         if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 646                 req.ucr_flags = USBD_SHORT_XFER_OK;
 647
 648         if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 649                 return _errno_to_libusb(errno);
 650
 651         if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
 652                 return _errno_to_libusb(errno);
 653
 654         itransfer->transferred = req.ucr_actlen;
 655
 656         usbi_dbg("transferred %d", itransfer->transferred);
 657
 658         return (0);
 659 }
 660
 661 int
 662 _access_endpoint(struct libusb_transfer *transfer)
 663 {
 664         struct handle_priv *hpriv;
 665         struct device_priv *dpriv;
 666         char *s, devnode[16];
 667         int fd, endpt;
 668         mode_t mode;
 669
 670         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 671         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 672
 673         endpt = UE_GET_ADDR(transfer->endpoint);
 674         mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;
 675
 676         usbi_dbg("endpoint %d mode %d", endpt, mode);
 677
 678         if (hpriv->endpoints[endpt] < 0) {
 679                 /* Pick the right node given the control one */
 680                 strlcpy(devnode, dpriv->devnode, sizeof(devnode));
 681                 s = strchr(devnode, '.');
 682                 snprintf(s, 4, ".%02d", endpt);
 683
 684                 /* We may need to read/write to the same endpoint later. */
 685                 if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
 686                         if ((fd = open(devnode, mode)) < 0)
 687                                 return (-1);
 688
 689                 hpriv->endpoints[endpt] = fd;
 690         }
 691
 692         return (hpriv->endpoints[endpt]);
 693 }
 694
 695 int
 696 _sync_gen_transfer(struct usbi_transfer *itransfer)
 697 {
 698         struct libusb_transfer *transfer;
 699         int fd, nr = 1;
 700
 701         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 702
 703         /*
 704          * Bulk, Interrupt or Isochronous transfer depends on the
 705          * endpoint and thus the node to open.
 706          */
 707         if ((fd = _access_endpoint(transfer)) < 0)
 708                 return _errno_to_libusb(errno);
 709
 710         if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 711                 return _errno_to_libusb(errno);
 712
 713         if (IS_XFERIN(transfer)) {
 714                 if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 715                         if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
 716                                 return _errno_to_libusb(errno);
 717
 718                 nr = read(fd, transfer->buffer, transfer->length);
 719         } else {
 720                 nr = write(fd, transfer->buffer, transfer->length);
 721         }
 722
 723         if (nr < 0)
 724                 return _errno_to_libusb(errno);
 725
 726         itransfer->transferred = nr;
 727
 728         return (0);
 729 }