libusb/os/netbsd_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 <config.h>
  20
  21 #include <sys/time.h>
  22 #include <sys/types.h>
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 #include <dev/usb/usb.h>
  32
  33 #include "libusbi.h"
  34
  35 struct device_priv {
  36         char devnode[16];
  37         int fd;
  38
  39         unsigned char *cdesc;                   /* active config descriptor */
  40         usb_device_descriptor_t ddesc;          /* usb device descriptor */
  41 };
  42
  43 struct handle_priv {
  44         int pipe[2];                            /* for event notification */
  45         int endpoints[USB_MAX_ENDPOINTS];
  46 };
  47
  48 /*
  49  * Backend functions
  50  */
  51 static int netbsd_get_device_list(struct libusb_context *,
  52     struct discovered_devs **);
  53 static int netbsd_open(struct libusb_device_handle *);
  54 static void netbsd_close(struct libusb_device_handle *);
  55
  56 static int netbsd_get_device_descriptor(struct libusb_device *, unsigned char *,
  57     int *);
  58 static int netbsd_get_active_config_descriptor(struct libusb_device *,
  59     unsigned char *, size_t, int *);
  60 static int netbsd_get_config_descriptor(struct libusb_device *, uint8_t,
  61     unsigned char *, size_t, int *);
  62
  63 static int netbsd_get_configuration(struct libusb_device_handle *, int *);
  64 static int netbsd_set_configuration(struct libusb_device_handle *, int);
  65
  66 static int netbsd_claim_interface(struct libusb_device_handle *, int);
  67 static int netbsd_release_interface(struct libusb_device_handle *, int);
  68
  69 static int netbsd_set_interface_altsetting(struct libusb_device_handle *, int,
  70     int);
  71 static int netbsd_clear_halt(struct libusb_device_handle *, unsigned char);
  72 static int netbsd_reset_device(struct libusb_device_handle *);
  73 static void netbsd_destroy_device(struct libusb_device *);
  74
  75 static int netbsd_submit_transfer(struct usbi_transfer *);
  76 static int netbsd_cancel_transfer(struct usbi_transfer *);
  77 static void netbsd_clear_transfer_priv(struct usbi_transfer *);
  78 static int netbsd_handle_events(struct libusb_context *ctx, struct pollfd *,
  79     nfds_t, int);
  80 static int netbsd_clock_gettime(int, struct timespec *);
  81
  82 /*
  83  * Private functions
  84  */
  85 static int _errno_to_libusb(int);
  86 static int _cache_active_config_descriptor(struct libusb_device *, int);
  87 static int _sync_control_transfer(struct usbi_transfer *);
  88 static int _sync_gen_transfer(struct usbi_transfer *);
  89 static int _access_endpoint(struct libusb_transfer *);
  90
  91 const struct usbi_os_backend netbsd_backend = {
  92         "Synchronous NetBSD backend",
  93         0,
  94         NULL,                           /* init() */
  95         NULL,                           /* exit() */
  96         netbsd_get_device_list,
  97         NULL,                           /* hotplug_poll */
  98         netbsd_open,
  99         netbsd_close,
 100
 101         netbsd_get_device_descriptor,
 102         netbsd_get_active_config_descriptor,
 103         netbsd_get_config_descriptor,
 104         NULL,                           /* get_config_descriptor_by_value() */
 105
 106         netbsd_get_configuration,
 107         netbsd_set_configuration,
 108
 109         netbsd_claim_interface,
 110         netbsd_release_interface,
 111
 112         netbsd_set_interface_altsetting,
 113         netbsd_clear_halt,
 114         netbsd_reset_device,
 115
 116         NULL,                           /* alloc_streams */
 117         NULL,                           /* free_streams */
 118
 119         NULL,                           /* kernel_driver_active() */
 120         NULL,                           /* detach_kernel_driver() */
 121         NULL,                           /* attach_kernel_driver() */
 122
 123         netbsd_destroy_device,
 124
 125         netbsd_submit_transfer,
 126         netbsd_cancel_transfer,
 127         netbsd_clear_transfer_priv,
 128
 129         netbsd_handle_events,
 130         NULL,                           /* handle_transfer_completion() */
 131
 132         netbsd_clock_gettime,
 133         sizeof(struct device_priv),
 134         sizeof(struct handle_priv),
 135         0,                              /* transfer_priv_size */
 136         0,                              /* add_iso_packet_size */
 137 };
 138
 139 int
 140 netbsd_get_device_list(struct libusb_context * ctx,
 141         struct discovered_devs **discdevs)
 142 {
 143         struct libusb_device *dev;
 144         struct device_priv *dpriv;
 145         struct usb_device_info di;
 146         unsigned long session_id;
 147         char devnode[16];
 148         int fd, err, i;
 149
 150         usbi_dbg("");
 151
 152         /* Only ugen(4) is supported */
 153         for (i = 0; i < USB_MAX_DEVICES; i++) {
 154                 /* Control endpoint is always .00 */
 155                 snprintf(devnode, sizeof(devnode), "/dev/ugen%d.00", i);
 156
 157                 if ((fd = open(devnode, O_RDONLY)) < 0) {
 158                         if (errno != ENOENT && errno != ENXIO)
 159                                 usbi_err(ctx, "could not open %s", devnode);
 160                         continue;
 161                 }
 162
 163                 if (ioctl(fd, USB_GET_DEVICEINFO, &di) < 0)
 164                         continue;
 165
 166                 session_id = (di.udi_bus << 8 | di.udi_addr);
 167                 dev = usbi_get_device_by_session_id(ctx, session_id);
 168
 169                 if (dev == NULL) {
 170                         dev = usbi_alloc_device(ctx, session_id);
 171                         if (dev == NULL)
 172                                 return (LIBUSB_ERROR_NO_MEM);
 173
 174                         dev->bus_number = di.udi_bus;
 175                         dev->device_address = di.udi_addr;
 176                         dev->speed = di.udi_speed;
 177
 178                         dpriv = (struct device_priv *)dev->os_priv;
 179                         strlcpy(dpriv->devnode, devnode, sizeof(devnode));
 180                         dpriv->fd = -1;
 181
 182                         if (ioctl(fd, USB_GET_DEVICE_DESC, &dpriv->ddesc) < 0) {
 183                                 err = errno;
 184                                 goto error;
 185                         }
 186
 187                         dpriv->cdesc = NULL;
 188                         if (_cache_active_config_descriptor(dev, fd)) {
 189                                 err = errno;
 190                                 goto error;
 191                         }
 192
 193                         if ((err = usbi_sanitize_device(dev)))
 194                                 goto error;
 195                 }
 196                 close(fd);
 197
 198                 if (discovered_devs_append(*discdevs, dev) == NULL)
 199                         return (LIBUSB_ERROR_NO_MEM);
 200
 201                 libusb_unref_device(dev);
 202         }
 203
 204         return (LIBUSB_SUCCESS);
 205
 206 error:
 207         close(fd);
 208         libusb_unref_device(dev);
 209         return _errno_to_libusb(err);
 210 }
 211
 212 int
 213 netbsd_open(struct libusb_device_handle *handle)
 214 {
 215         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 216         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 217
 218         dpriv->fd = open(dpriv->devnode, O_RDWR);
 219         if (dpriv->fd < 0) {
 220                 dpriv->fd = open(dpriv->devnode, O_RDONLY);
 221                 if (dpriv->fd < 0)
 222                         return _errno_to_libusb(errno);
 223         }
 224
 225         usbi_dbg("open %s: fd %d", dpriv->devnode, dpriv->fd);
 226
 227         if (pipe(hpriv->pipe) < 0)
 228                 return _errno_to_libusb(errno);
 229
 230         return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->pipe[0], POLLIN);
 231 }
 232
 233 void
 234 netbsd_close(struct libusb_device_handle *handle)
 235 {
 236         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 237         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 238
 239         usbi_dbg("close: fd %d", dpriv->fd);
 240
 241         close(dpriv->fd);
 242         dpriv->fd = -1;
 243
 244         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 245
 246         close(hpriv->pipe[0]);
 247         close(hpriv->pipe[1]);
 248 }
 249
 250 int
 251 netbsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
 252     int *host_endian)
 253 {
 254         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 255
 256         usbi_dbg("");
 257
 258         memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);
 259
 260         *host_endian = 0;
 261
 262         return (LIBUSB_SUCCESS);
 263 }
 264
 265 int
 266 netbsd_get_active_config_descriptor(struct libusb_device *dev,
 267     unsigned char *buf, size_t len, int *host_endian)
 268 {
 269         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 270         usb_config_descriptor_t *ucd;
 271
 272         ucd = (usb_config_descriptor_t *) dpriv->cdesc;
 273         len = MIN(len, UGETW(ucd->wTotalLength));
 274
 275         usbi_dbg("len %d", len);
 276
 277         memcpy(buf, dpriv->cdesc, len);
 278
 279         *host_endian = 0;
 280
 281         return len;
 282 }
 283
 284 int
 285 netbsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
 286     unsigned char *buf, size_t len, int *host_endian)
 287 {
 288         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 289         struct usb_full_desc ufd;
 290         int fd, err;
 291
 292         usbi_dbg("index %d, len %d", idx, len);
 293
 294         /* A config descriptor may be requested before opening the device */
 295         if (dpriv->fd >= 0) {
 296                 fd = dpriv->fd;
 297         } else {
 298                 fd = open(dpriv->devnode, O_RDONLY);
 299                 if (fd < 0)
 300                         return _errno_to_libusb(errno);
 301         }
 302
 303         ufd.ufd_config_index = idx;
 304         ufd.ufd_size = len;
 305         ufd.ufd_data = buf;
 306
 307         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 308                 err = errno;
 309                 if (dpriv->fd < 0)
 310                         close(fd);
 311                 return _errno_to_libusb(err);
 312         }
 313
 314         if (dpriv->fd < 0)
 315                 close(fd);
 316
 317         *host_endian = 0;
 318
 319         return len;
 320 }
 321
 322 int
 323 netbsd_get_configuration(struct libusb_device_handle *handle, int *config)
 324 {
 325         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 326
 327         usbi_dbg("");
 328
 329         if (ioctl(dpriv->fd, USB_GET_CONFIG, config) < 0)
 330                 return _errno_to_libusb(errno);
 331
 332         usbi_dbg("configuration %d", *config);
 333
 334         return (LIBUSB_SUCCESS);
 335 }
 336
 337 int
 338 netbsd_set_configuration(struct libusb_device_handle *handle, int config)
 339 {
 340         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 341
 342         usbi_dbg("configuration %d", config);
 343
 344         if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
 345                 return _errno_to_libusb(errno);
 346
 347         return _cache_active_config_descriptor(handle->dev, dpriv->fd);
 348 }
 349
 350 int
 351 netbsd_claim_interface(struct libusb_device_handle *handle, int iface)
 352 {
 353         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 354         int i;
 355
 356         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 357                 hpriv->endpoints[i] = -1;
 358
 359         return (LIBUSB_SUCCESS);
 360 }
 361
 362 int
 363 netbsd_release_interface(struct libusb_device_handle *handle, int iface)
 364 {
 365         struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
 366         int i;
 367
 368         for (i = 0; i < USB_MAX_ENDPOINTS; i++)
 369                 if (hpriv->endpoints[i] >= 0)
 370                         close(hpriv->endpoints[i]);
 371
 372         return (LIBUSB_SUCCESS);
 373 }
 374
 375 int
 376 netbsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
 377     int altsetting)
 378 {
 379         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 380         struct usb_alt_interface intf;
 381
 382         usbi_dbg("iface %d, setting %d", iface, altsetting);
 383
 384         memset(&intf, 0, sizeof(intf));
 385
 386         intf.uai_interface_index = iface;
 387         intf.uai_alt_no = altsetting;
 388
 389         if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
 390                 return _errno_to_libusb(errno);
 391
 392         return (LIBUSB_SUCCESS);
 393 }
 394
 395 int
 396 netbsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
 397 {
 398         struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
 399         struct usb_ctl_request req;
 400
 401         usbi_dbg("");
 402
 403         req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
 404         req.ucr_request.bRequest = UR_CLEAR_FEATURE;
 405         USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
 406         USETW(req.ucr_request.wIndex, endpoint);
 407         USETW(req.ucr_request.wLength, 0);
 408
 409         if (ioctl(dpriv->fd, USB_DO_REQUEST, &req) < 0)
 410                 return _errno_to_libusb(errno);
 411
 412         return (LIBUSB_SUCCESS);
 413 }
 414
 415 int
 416 netbsd_reset_device(struct libusb_device_handle *handle)
 417 {
 418         usbi_dbg("");
 419
 420         return (LIBUSB_ERROR_NOT_SUPPORTED);
 421 }
 422
 423 void
 424 netbsd_destroy_device(struct libusb_device *dev)
 425 {
 426         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 427
 428         usbi_dbg("");
 429
 430         free(dpriv->cdesc);
 431 }
 432
 433 int
 434 netbsd_submit_transfer(struct usbi_transfer *itransfer)
 435 {
 436         struct libusb_transfer *transfer;
 437         struct handle_priv *hpriv;
 438         int err = 0;
 439
 440         usbi_dbg("");
 441
 442         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 443         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 444
 445         switch (transfer->type) {
 446         case LIBUSB_TRANSFER_TYPE_CONTROL:
 447                 err = _sync_control_transfer(itransfer);
 448                 break;
 449         case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
 450                 if (IS_XFEROUT(transfer)) {
 451                         /* Isochronous write is not supported */
 452                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 453                         break;
 454                 }
 455                 err = _sync_gen_transfer(itransfer);
 456                 break;
 457         case LIBUSB_TRANSFER_TYPE_BULK:
 458         case LIBUSB_TRANSFER_TYPE_INTERRUPT:
 459                 if (IS_XFEROUT(transfer) &&
 460                     transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
 461                         err = LIBUSB_ERROR_NOT_SUPPORTED;
 462                         break;
 463                 }
 464                 err = _sync_gen_transfer(itransfer);
 465                 break;
 466         case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
 467                 err = LIBUSB_ERROR_NOT_SUPPORTED;
 468                 break;
 469         }
 470
 471         if (err)
 472                 return (err);
 473
 474         if (write(hpriv->pipe[1], &itransfer, sizeof(itransfer)) < 0)
 475                 return _errno_to_libusb(errno);
 476
 477         return (LIBUSB_SUCCESS);
 478 }
 479
 480 int
 481 netbsd_cancel_transfer(struct usbi_transfer *itransfer)
 482 {
 483         usbi_dbg("");
 484
 485         return (LIBUSB_ERROR_NOT_SUPPORTED);
 486 }
 487
 488 void
 489 netbsd_clear_transfer_priv(struct usbi_transfer *itransfer)
 490 {
 491         usbi_dbg("");
 492
 493         /* Nothing to do */
 494 }
 495
 496 int
 497 netbsd_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds,
 498     int num_ready)
 499 {
 500         struct libusb_device_handle *handle;
 501         struct handle_priv *hpriv = NULL;
 502         struct usbi_transfer *itransfer;
 503         struct pollfd *pollfd;
 504         int i, err = 0;
 505
 506         usbi_dbg("");
 507
 508         pthread_mutex_lock(&ctx->open_devs_lock);
 509         for (i = 0; i < nfds && num_ready > 0; i++) {
 510                 pollfd = &fds[i];
 511
 512                 if (!pollfd->revents)
 513                         continue;
 514
 515                 hpriv = NULL;
 516                 num_ready--;
 517                 list_for_each_entry(handle, &ctx->open_devs, list,
 518                     struct libusb_device_handle) {
 519                         hpriv = (struct handle_priv *)handle->os_priv;
 520
 521                         if (hpriv->pipe[0] == pollfd->fd)
 522                                 break;
 523
 524                         hpriv = NULL;
 525                 }
 526
 527                 if (NULL == hpriv) {
 528                         usbi_dbg("fd %d is not an event pipe!", pollfd->fd);
 529                         err = ENOENT;
 530                         break;
 531                 }
 532
 533                 if (pollfd->revents & POLLERR) {
 534                         usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
 535                         usbi_handle_disconnect(handle);
 536                         continue;
 537                 }
 538
 539                 if (read(hpriv->pipe[0], &itransfer, sizeof(itransfer)) < 0) {
 540                         err = errno;
 541                         break;
 542                 }
 543
 544                 if ((err = usbi_handle_transfer_completion(itransfer,
 545                     LIBUSB_TRANSFER_COMPLETED)))
 546                         break;
 547         }
 548         pthread_mutex_unlock(&ctx->open_devs_lock);
 549
 550         if (err)
 551                 return _errno_to_libusb(err);
 552
 553         return (LIBUSB_SUCCESS);
 554 }
 555
 556 int
 557 netbsd_clock_gettime(int clkid, struct timespec *tp)
 558 {
 559         usbi_dbg("clock %d", clkid);
 560
 561         if (clkid == USBI_CLOCK_REALTIME)
 562                 return clock_gettime(CLOCK_REALTIME, tp);
 563
 564         if (clkid == USBI_CLOCK_MONOTONIC)
 565                 return clock_gettime(CLOCK_MONOTONIC, tp);
 566
 567         return (LIBUSB_ERROR_INVALID_PARAM);
 568 }
 569
 570 int
 571 _errno_to_libusb(int err)
 572 {
 573         switch (err) {
 574         case EIO:
 575                 return (LIBUSB_ERROR_IO);
 576         case EACCES:
 577                 return (LIBUSB_ERROR_ACCESS);
 578         case ENOENT:
 579                 return (LIBUSB_ERROR_NO_DEVICE);
 580         case ENOMEM:
 581                 return (LIBUSB_ERROR_NO_MEM);
 582         }
 583
 584         usbi_dbg("error: %s", strerror(err));
 585
 586         return (LIBUSB_ERROR_OTHER);
 587 }
 588
 589 int
 590 _cache_active_config_descriptor(struct libusb_device *dev, int fd)
 591 {
 592         struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
 593         struct usb_config_desc ucd;
 594         struct usb_full_desc ufd;
 595         unsigned char* buf;
 596         int len;
 597
 598         usbi_dbg("fd %d", fd);
 599
 600         ucd.ucd_config_index = USB_CURRENT_CONFIG_INDEX;
 601
 602         if ((ioctl(fd, USB_GET_CONFIG_DESC, &ucd)) < 0)
 603                 return _errno_to_libusb(errno);
 604
 605         usbi_dbg("active bLength %d", ucd.ucd_desc.bLength);
 606
 607         len = UGETW(ucd.ucd_desc.wTotalLength);
 608         buf = malloc(len);
 609         if (buf == NULL)
 610                 return (LIBUSB_ERROR_NO_MEM);
 611
 612         ufd.ufd_config_index = ucd.ucd_config_index;
 613         ufd.ufd_size = len;
 614         ufd.ufd_data = buf;
 615
 616         usbi_dbg("index %d, len %d", ufd.ufd_config_index, len);
 617
 618         if ((ioctl(fd, USB_GET_FULL_DESC, &ufd)) < 0) {
 619                 free(buf);
 620                 return _errno_to_libusb(errno);
 621         }
 622
 623         if (dpriv->cdesc)
 624                 free(dpriv->cdesc);
 625         dpriv->cdesc = buf;
 626
 627         return (0);
 628 }
 629
 630 int
 631 _sync_control_transfer(struct usbi_transfer *itransfer)
 632 {
 633         struct libusb_transfer *transfer;
 634         struct libusb_control_setup *setup;
 635         struct device_priv *dpriv;
 636         struct usb_ctl_request req;
 637
 638         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 639         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 640         setup = (struct libusb_control_setup *)transfer->buffer;
 641
 642         usbi_dbg("type %d request %d value %d index %d length %d timeout %d",
 643             setup->bmRequestType, setup->bRequest,
 644             libusb_le16_to_cpu(setup->wValue),
 645             libusb_le16_to_cpu(setup->wIndex),
 646             libusb_le16_to_cpu(setup->wLength), transfer->timeout);
 647
 648         req.ucr_request.bmRequestType = setup->bmRequestType;
 649         req.ucr_request.bRequest = setup->bRequest;
 650         /* Don't use USETW, libusb already deals with the endianness */
 651         (*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
 652         (*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
 653         (*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
 654         req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
 655
 656         if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 657                 req.ucr_flags = USBD_SHORT_XFER_OK;
 658
 659         if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 660                 return _errno_to_libusb(errno);
 661
 662         if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
 663                 return _errno_to_libusb(errno);
 664
 665         itransfer->transferred = req.ucr_actlen;
 666
 667         usbi_dbg("transferred %d", itransfer->transferred);
 668
 669         return (0);
 670 }
 671
 672 int
 673 _access_endpoint(struct libusb_transfer *transfer)
 674 {
 675         struct handle_priv *hpriv;
 676         struct device_priv *dpriv;
 677         char *s, devnode[16];
 678         int fd, endpt;
 679         mode_t mode;
 680
 681         hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
 682         dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
 683
 684         endpt = UE_GET_ADDR(transfer->endpoint);
 685         mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;
 686
 687         usbi_dbg("endpoint %d mode %d", endpt, mode);
 688
 689         if (hpriv->endpoints[endpt] < 0) {
 690                 /* Pick the right node given the control one */
 691                 strlcpy(devnode, dpriv->devnode, sizeof(devnode));
 692                 s = strchr(devnode, '.');
 693                 snprintf(s, 4, ".%02d", endpt);
 694
 695                 /* We may need to read/write to the same endpoint later. */
 696                 if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
 697                         if ((fd = open(devnode, mode)) < 0)
 698                                 return (-1);
 699
 700                 hpriv->endpoints[endpt] = fd;
 701         }
 702
 703         return (hpriv->endpoints[endpt]);
 704 }
 705
 706 int
 707 _sync_gen_transfer(struct usbi_transfer *itransfer)
 708 {
 709         struct libusb_transfer *transfer;
 710         int fd, nr = 1;
 711
 712         transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 713
 714         /*
 715          * Bulk, Interrupt or Isochronous transfer depends on the
 716          * endpoint and thus the node to open.
 717          */
 718         if ((fd = _access_endpoint(transfer)) < 0)
 719                 return _errno_to_libusb(errno);
 720
 721         if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
 722                 return _errno_to_libusb(errno);
 723
 724         if (IS_XFERIN(transfer)) {
 725                 if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
 726                         if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
 727                                 return _errno_to_libusb(errno);
 728
 729                 nr = read(fd, transfer->buffer, transfer->length);
 730         } else {
 731                 nr = write(fd, transfer->buffer, transfer->length);
 732         }
 733
 734         if (nr < 0)
 735                 return _errno_to_libusb(errno);
 736
 737         itransfer->transferred = nr;
 738
 739         return (0);
 740 }