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         NULL,                           /* hotplug_poll */
  97         obsd_open,
  98         obsd_close,
  99
 100         obsd_get_device_descriptor,
 101         obsd_get_active_config_descriptor,
 102         obsd_get_config_descriptor,
 103         NULL,                           /* get_config_descriptor_by_value() */
 104
 105         obsd_get_configuration,
 106         obsd_set_configuration,
 107
 108         obsd_claim_interface,
 109         obsd_release_interface,
 110
 111         obsd_set_interface_altsetting,
 112         obsd_clear_halt,
 113         obsd_reset_device,
 114
 115         NULL,                           /* kernel_driver_active() */
 116         NULL,                           /* detach_kernel_driver() */
 117         NULL,                           /* attach_kernel_driver() */
 118
 119         obsd_destroy_device,
 120
 121         obsd_submit_transfer,
 122         obsd_cancel_transfer,
 123         obsd_clear_transfer_priv,
 124
 125         obsd_handle_events,
 126
 127         obsd_clock_gettime,
 128         sizeof(struct device_priv),
 129         sizeof(struct handle_priv),
 130         0,                              /* transfer_priv_size */
 131         0,                              /* add_iso_packet_size */
 132 };
 133
 134 int
 135 obsd_get_device_list(struct libusb_context * ctx,
 136         struct discovered_devs **discdevs)
 137 {
 138         struct libusb_device *dev;
 139         struct device_priv *dpriv;
 140         struct usb_device_info di;
 141         unsigned long session_id;
 142         char devnode[16];
 143         int fd, err, i;
 144
 145         usbi_dbg("");
 146
 147         /* Only ugen(4) is supported */
 148         for (i = 0; i < USB_MAX_DEVICES; i++) {
 149                 /* Control endpoint is always .00 */
 150                 snprintf(devnode, sizeof(devnode), "/dev/ugen%d.00", i);
 151
 152                 if ((fd = open(devnode, O_RDONLY)) < 0) {
 153                         if (errno != ENOENT && errno != ENXIO)
 154                                 usbi_err(ctx, "could not open %s", devnode);
 155                         continue;
 156                 }
 157
 158                 if (ioctl(fd, USB_GET_DEVICEINFO, &di) < 0)
 159                         continue;
 160
 161                 session_id = (di.udi_bus << 8 | di.udi_addr);
 162                 dev = usbi_get_device_by_session_id(ctx, session_id);
 163
 164                 if (dev) {
 165                         dev = libusb_ref_device(dev);
 166                 } else {
 167                         dev = usbi_alloc_device(ctx, session_id);
 168                         if (dev == NULL)
 169                                 return (LIBUSB_ERROR_NO_MEM);
 170
 171                         dev->bus_number = di.udi_bus;
 172                         dev->device_address = di.udi_addr;
 173                         dev->speed = di.udi_speed;
 174
 175                         dpriv = (struct device_priv *)dev->os_priv;
 176                         strlcpy(dpriv->devnode, devnode, sizeof(devnode));
 177                         dpriv->fd = -1;
 178
 179                         if (ioctl(fd, USB_GET_DEVICE_DESC, &dpriv->ddesc) < 0) {
 180                                 err = errno;
 181                                 goto error;
 182                         }
 183
 184                         dpriv->cdesc = NULL;
 185                         if (_cache_active_config_descriptor(dev, fd)) {
 186                                 err = errno;
 187                                 goto error;
 188                         }
 189
 190                         if ((err = usbi_sanitize_device(dev)))
 191                                 goto error;
 192                 }
 193                 close(fd);
 194
 195                 if (discovered_devs_append(*discdevs, dev) == NULL)
 196                         return (LIBUSB_ERROR_NO_MEM);
 197
 198                 libusb_unref_device(dev);
 199         }
 200
 201         return (LIBUSB_SUCCESS);
 202
 203 error:
 204         close(fd);
 205         libusb_unref_device(dev);
 206         return _errno_to_libusb(err);
 207 }
 208
 209 int
 210 obsd_open(struct libusb_device_handle *handle)
 211 {
 212         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 213         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 214
 215         dpriv->fd = open(dpriv->devnode, O_RDWR);
 216         if (dpriv->fd < 0) {
 217                 dpriv->fd = open(dpriv->devnode, O_RDONLY);
 218                 if (dpriv->fd < 0)
 219                         return _errno_to_libusb(errno);
 220         }
 221
 222         usbi_dbg("open %s: fd %d", dpriv->devnode, dpriv->fd);
 223
 224         if (pipe(hpriv->pipe) < 0)
 225                 return _errno_to_libusb(errno);
 226
 227         return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->pipe[0], POLLIN);
 228 }
 229
 230 void
 231 obsd_close(struct libusb_device_handle *handle)
 232 {
 233         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 234         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 235
 236         usbi_dbg("close: fd %d", dpriv->fd);
 237
 238         close(dpriv->fd);
 239         dpriv->fd = -1;
 240
 241         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 242
 243         close(hpriv->pipe[0]);
 244         close(hpriv->pipe[1]);
 245 }
 246
 247 int
 248 obsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
 249     int *host_endian)
 250 {
 251         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 252
 253         usbi_dbg("");
 254
 255         memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);
 256
 257         *host_endian = 0;
 258
 259         return (LIBUSB_SUCCESS);
 260 }
 261
 262 int
 263 obsd_get_active_config_descriptor(struct libusb_device *dev,
 264     unsigned char *buf, size_t len, int *host_endian)
 265 {
 266         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 267         usb_config_descriptor_t *ucd;
 268
 269         ucd = (usb_config_descriptor_t *) dpriv->cdesc;
 270         len = MIN(len, UGETW(ucd->wTotalLength));
 271
 272         usbi_dbg("len %d", len);
 273
 274         memcpy(buf, dpriv->cdesc, len);
 275
 276         *host_endian = 0;
 277
 278         return len;
 279 }
 280
 281 int
 282 obsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
 283     unsigned char *buf, size_t len, int *host_endian)
 284 {
 285         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 286         struct usb_full_desc ufd;
 287         int fd, err;
 288
 289         usbi_dbg("index %d, len %d", idx, len);
 290
 291         /* A config descriptor may be requested before opening the device */
 292         if (dpriv->fd >= 0) {
 293                 fd = dpriv->fd;
 294         } else {
 295                 fd = open(dpriv->devnode, O_RDONLY);
 296                 if (fd < 0)
 297                         return _errno_to_libusb(errno);
 298         }
 299
 300         ufd.ufd_config_index = idx;
 301         ufd.ufd_size = len;
 302         ufd.ufd_data = buf;
 303
 304         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 305                 err = errno;
 306                 if (dpriv->fd < 0)
 307                         close(fd);
 308                 return _errno_to_libusb(err);
 309         }
 310
 311         if (dpriv->fd < 0)
 312                 close(fd);
 313
 314         *host_endian = 0;
 315
 316         return len;
 317 }
 318
 319 int
 320 obsd_get_configuration(struct libusb_device_handle *handle, int *config)
 321 {
 322         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 323
 324         usbi_dbg("");
 325
 326         if (ioctl(dpriv->fd, USB_GET_CONFIG, config) < 0)
 327                 return _errno_to_libusb(errno);
 328
 329         usbi_dbg("configuration %d", *config);
 330
 331         return (LIBUSB_SUCCESS);
 332 }
 333
 334 int
 335 obsd_set_configuration(struct libusb_device_handle *handle, int config)
 336 {
 337         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 338
 339         usbi_dbg("configuration %d", config);
 340
 341         if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
 342                 return _errno_to_libusb(errno);
 343
 344         return _cache_active_config_descriptor(handle->dev, dpriv->fd);
 345 }
 346
 347 int
 348 obsd_claim_interface(struct libusb_device_handle *handle, int iface)
 349 {
 350         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 351         int i;
 352
 353         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 354                 hpriv->endpoints[i] = -1;
 355
 356         return (LIBUSB_SUCCESS);
 357 }
 358
 359 int
 360 obsd_release_interface(struct libusb_device_handle *handle, int iface)
 361 {
 362         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 363         int i;
 364
 365         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 366                 if (hpriv->endpoints[i] >= 0)
 367                         close(hpriv->endpoints[i]);
 368
 369         return (LIBUSB_SUCCESS);
 370 }
 371
 372 int
 373 obsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
 374     int altsetting)
 375 {
 376         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 377         struct usb_alt_interface intf;
 378
 379         usbi_dbg("iface %d, setting %d", iface, altsetting);
 380
 381         memset(&intf, 0, sizeof(intf));
 382
 383         intf.uai_interface_index = iface;
 384         intf.uai_alt_no = altsetting;
 385
 386         if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
 387                 return _errno_to_libusb(errno);
 388
 389         return (LIBUSB_SUCCESS);
 390 }
 391
 392 int
 393 obsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
 394 {
 395         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 396         struct usb_ctl_request req;
 397
 398         usbi_dbg("");
 399
 400         req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
 401         req.ucr_request.bRequest = UR_CLEAR_FEATURE;
 402         USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
 403         USETW(req.ucr_request.wIndex, endpoint);
 404         USETW(req.ucr_request.wLength, 0);
 405
 406         if (ioctl(dpriv->fd, USB_DO_REQUEST, &req) < 0)
 407                 return _errno_to_libusb(errno);
 408
 409         return (LIBUSB_SUCCESS);
 410 }
 411
 412 int
 413 obsd_reset_device(struct libusb_device_handle *handle)
 414 {
 415         usbi_dbg("");
 416
 417         return (LIBUSB_ERROR_NOT_SUPPORTED);
 418 }
 419
 420 void
 421 obsd_destroy_device(struct libusb_device *dev)
 422 {
 423         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 424
 425         usbi_dbg("");
 426
 427         free(dpriv->cdesc);
 428 }
 429
 430 int
 431 obsd_submit_transfer(struct usbi_transfer *itransfer)
 432 {
 433         struct libusb_transfer *transfer;
 434         struct handle_priv *hpriv;
 435         int err = 0;
 436
 437         usbi_dbg("");
 438
 439         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 440         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 441
 442         switch (transfer->type) {
 443         case LIBUSB_TRANSFER_TYPE_CONTROL:
 444                 err = _sync_control_transfer(itransfer);
 445                 break;
 446         case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
 447                 if (IS_XFEROUT(transfer)) {
 448                         /* Isochronous write is not supported */
 449                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 450                         break;
 451                 }
 452                 err = _sync_gen_transfer(itransfer);
 453                 break;
 454         case LIBUSB_TRANSFER_TYPE_BULK:
 455         case LIBUSB_TRANSFER_TYPE_INTERRUPT:
 456                 if (IS_XFEROUT(transfer) &&
 457                     transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
 458                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 459                         break;
 460                 }
 461                 err = _sync_gen_transfer(itransfer);
 462                 break;
 463         }
 464
 465         if (err)
 466                 return (err);
 467
 468         if (write(hpriv->pipe[1], &itransfer, sizeof(itransfer)) < 0)
 469                 return _errno_to_libusb(errno);
 470
 471         return (LIBUSB_SUCCESS);
 472 }
 473
 474 int
 475 obsd_cancel_transfer(struct usbi_transfer *itransfer)
 476 {
 477         usbi_dbg("");
 478
 479         return (LIBUSB_ERROR_NOT_SUPPORTED);
 480 }
 481
 482 void
 483 obsd_clear_transfer_priv(struct usbi_transfer *itransfer)
 484 {
 485         usbi_dbg("");
 486
 487         /* Nothing to do */
 488 }
 489
 490 int
 491 obsd_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds,
 492     int num_ready)
 493 {
 494         struct libusb_device_handle *handle;
 495         struct handle_priv *hpriv = NULL;
 496         struct usbi_transfer *itransfer;
 497         struct pollfd *pollfd;
 498         int i, err = 0;
 499
 500         usbi_dbg("");
 501
 502         pthread_mutex_lock(&ctx->open_devs_lock);
 503         for (i = 0; i < nfds && num_ready > 0; i++) {
 504                 pollfd = &fds[i];
 505
 506                 if (!pollfd->revents)
 507                         continue;
 508
 509                 hpriv = NULL;
 510                 num_ready--;
 511                 list_for_each_entry(handle, &ctx->open_devs, list,
 512                     struct libusb_device_handle) {
 513                         hpriv = (struct handle_priv *)handle->os_priv;
 514
 515                         if (hpriv->pipe[0] == pollfd->fd)
 516                                 break;
 517
 518                         hpriv = NULL;
 519                 }
 520
 521                 if (NULL == hpriv) {
 522                         usbi_dbg("fd %d is not an event pipe!", pollfd->fd);
 523                         err = ENOENT;
 524                         break;
 525                 }
 526
 527                 if (pollfd->revents & POLLERR) {
 528                         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 529                         usbi_handle_disconnect(handle);
 530                         continue;
 531                 }
 532
 533                 if (read(hpriv->pipe[0], &itransfer, sizeof(itransfer)) < 0) {
 534                         err = errno;
 535                         break;
 536                 }
 537
 538                 if ((err = usbi_handle_transfer_completion(itransfer,
 539                     LIBUSB_TRANSFER_COMPLETED)))
 540                         break;
 541         }
 542         pthread_mutex_unlock(&ctx->open_devs_lock);
 543
 544         if (err)
 545                 return _errno_to_libusb(err);
 546
 547         return (LIBUSB_SUCCESS);
 548 }
 549
 550 int
 551 obsd_clock_gettime(int clkid, struct timespec *tp)
 552 {
 553         usbi_dbg("clock %d", clkid);
 554
 555         if (clkid == USBI_CLOCK_REALTIME)
 556                 return clock_gettime(CLOCK_REALTIME, tp);
 557
 558         if (clkid == USBI_CLOCK_MONOTONIC)
 559                 return clock_gettime(CLOCK_MONOTONIC, tp);
 560
 561         return (LIBUSB_ERROR_INVALID_PARAM);
 562 }
 563
 564 int
 565 _errno_to_libusb(int err)
 566 {
 567         switch (err) {
 568         case EIO:
 569                 return (LIBUSB_ERROR_IO);
 570         case EACCES:
 571                 return (LIBUSB_ERROR_ACCESS);
 572         case ENOENT:
 573                 return (LIBUSB_ERROR_NO_DEVICE);
 574         case ENOMEM:
 575                 return (LIBUSB_ERROR_NO_MEM);
 576         }
 577
 578         usbi_dbg("error: %s", strerror(err));
 579
 580         return (LIBUSB_ERROR_OTHER);
 581 }
 582
 583 int
 584 _cache_active_config_descriptor(struct libusb_device *dev, int fd)
 585 {
 586         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 587         struct usb_config_desc ucd;
 588         struct usb_full_desc ufd;
 589         unsigned char* buf;
 590         int len;
 591
 592         usbi_dbg("fd %d", fd);
 593
 594         ucd.ucd_config_index = USB_CURRENT_CONFIG_INDEX;
 595
 596         if ((ioctl(fd, USB_GET_CONFIG_DESC, &ucd)) < 0)
 597                 return _errno_to_libusb(errno);
 598
 599         usbi_dbg("active bLength %d", ucd.ucd_desc.bLength);
 600
 601         len = UGETW(ucd.ucd_desc.wTotalLength);
 602         buf = malloc(len);
 603         if (buf == NULL)
 604                 return (LIBUSB_ERROR_NO_MEM);
 605
 606         ufd.ufd_config_index = ucd.ucd_config_index;
 607         ufd.ufd_size = len;
 608         ufd.ufd_data = buf;
 609
 610         usbi_dbg("index %d, len %d", ufd.ufd_config_index, len);
 611
 612         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 613                 free(buf);
 614                 return _errno_to_libusb(errno);
 615         }
 616
 617         if (dpriv->cdesc)
 618                 free(dpriv->cdesc);
 619         dpriv->cdesc = buf;
 620
 621         return (0);
 622 }
 623
 624 int
 625 _sync_control_transfer(struct usbi_transfer *itransfer)
 626 {
 627         struct libusb_transfer *transfer;
 628         struct libusb_control_setup *setup;
 629         struct device_priv *dpriv;
 630         struct usb_ctl_request req;
 631
 632         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 633         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 634         setup = (struct libusb_control_setup *)transfer->buffer;
 635
 636         usbi_dbg("type %d request %d value %d index %d length %d timeout %d",
 637             setup->bmRequestType, setup->bRequest,
 638             libusb_le16_to_cpu(setup->wValue),
 639             libusb_le16_to_cpu(setup->wIndex),
 640             libusb_le16_to_cpu(setup->wLength), transfer->timeout);
 641
 642         req.ucr_request.bmRequestType = setup->bmRequestType;
 643         req.ucr_request.bRequest = setup->bRequest;
 644         /* Don't use USETW, libusbx already deals with the endianness */
 645         (*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
 646         (*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
 647         (*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
 648         req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
 649
 650         if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 651                 req.ucr_flags = USBD_SHORT_XFER_OK;
 652
 653         if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 654                 return _errno_to_libusb(errno);
 655
 656         if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
 657                 return _errno_to_libusb(errno);
 658
 659         itransfer->transferred = req.ucr_actlen;
 660
 661         usbi_dbg("transferred %d", itransfer->transferred);
 662
 663         return (0);
 664 }
 665
 666 int
 667 _access_endpoint(struct libusb_transfer *transfer)
 668 {
 669         struct handle_priv *hpriv;
 670         struct device_priv *dpriv;
 671         char *s, devnode[16];
 672         int fd, endpt;
 673         mode_t mode;
 674
 675         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 676         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 677
 678         endpt = UE_GET_ADDR(transfer->endpoint);
 679         mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;
 680
 681         usbi_dbg("endpoint %d mode %d", endpt, mode);
 682
 683         if (hpriv->endpoints[endpt] < 0) {
 684                 /* Pick the right node given the control one */
 685                 strlcpy(devnode, dpriv->devnode, sizeof(devnode));
 686                 s = strchr(devnode, '.');
 687                 snprintf(s, 4, ".%02d", endpt);
 688
 689                 /* We may need to read/write to the same endpoint later. */
 690                 if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
 691                         if ((fd = open(devnode, mode)) < 0)
 692                                 return (-1);
 693
 694                 hpriv->endpoints[endpt] = fd;
 695         }
 696
 697         return (hpriv->endpoints[endpt]);
 698 }
 699
 700 int
 701 _sync_gen_transfer(struct usbi_transfer *itransfer)
 702 {
 703         struct libusb_transfer *transfer;
 704         int fd, nr = 1;
 705
 706         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 707
 708         /*
 709          * Bulk, Interrupt or Isochronous transfer depends on the
 710          * endpoint and thus the node to open.
 711          */
 712         if ((fd = _access_endpoint(transfer)) < 0)
 713                 return _errno_to_libusb(errno);
 714
 715         if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 716                 return _errno_to_libusb(errno);
 717
 718         if (IS_XFERIN(transfer)) {
 719                 if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 720                         if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
 721                                 return _errno_to_libusb(errno);
 722
 723                 nr = read(fd, transfer->buffer, transfer->length);
 724         } else {
 725                 nr = write(fd, transfer->buffer, transfer->length);
 726         }
 727
 728         if (nr < 0)
 729                 return _errno_to_libusb(errno);
 730
 731         itransfer->transferred = nr;
 732
 733         return (0);
 734 }