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