libusb/os/darwin_usb.c

   1 /*
   2  * darwin backend for libusb 1.0
   3  * Copyright (C) 2008-2010 Nathan Hjelm <hjelmn@users.sourceforge.net>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include <config.h>
  21 #include <ctype.h>
  22 #include <dirent.h>
  23 #include <errno.h>
  24 #include <fcntl.h>
  25 #include <pthread.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/ioctl.h>
  30 #include <sys/stat.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33
  34 #include <mach/clock.h>
  35 #include <mach/clock_types.h>
  36 #include <mach/mach_host.h>
  37
  38 #include <mach/mach_port.h>
  39 #include <IOKit/IOCFBundle.h>
  40 #include <IOKit/usb/IOUSBLib.h>
  41 #include <IOKit/IOCFPlugIn.h>
  42
  43 #include "darwin_usb.h"
  44
  45 static mach_port_t  libusb_darwin_mp = 0; /* master port */
  46 static CFRunLoopRef libusb_darwin_acfl = NULL; /* async cf loop */
  47 static int initCount = 0;
  48
  49 /* async event thread */
  50 static pthread_t libusb_darwin_at;
  51
  52 static int darwin_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian);
  53 static int darwin_claim_interface(struct libusb_device_handle *dev_handle, int iface);
  54 static int darwin_release_interface(struct libusb_device_handle *dev_handle, int iface);
  55 static int darwin_reset_device(struct libusb_device_handle *dev_handle);
  56 static void darwin_async_io_callback (void *refcon, IOReturn result, void *arg0);
  57
  58 static const char *darwin_error_str (int result) {
  59   switch (result) {
  60   case kIOReturnSuccess:
  61     return "no error";
  62   case kIOReturnNotOpen:
  63     return "device not opened for exclusive access";
  64   case kIOReturnNoDevice:
  65     return "no connection to an IOService";
  66   case kIOUSBNoAsyncPortErr:
  67     return "no async port has been opened for interface";
  68   case kIOReturnExclusiveAccess:
  69     return "another process has device opened for exclusive access";
  70   case kIOUSBPipeStalled:
  71     return "pipe is stalled";
  72   case kIOReturnError:
  73     return "could not establish a connection to the Darwin kernel";
  74   case kIOUSBTransactionTimeout:
  75     return "transaction timed out";
  76   case kIOReturnBadArgument:
  77     return "invalid argument";
  78   case kIOReturnAborted:
  79     return "transaction aborted";
  80   case kIOReturnNotResponding:
  81     return "device not responding";
  82   case kIOReturnOverrun:
  83     return "data overrun";
  84   case kIOReturnCannotWire:
  85     return "physical memory can not be wired down";
  86   default:
  87     return "unknown error";
  88   }
  89 }
  90
  91 static int darwin_to_libusb (int result) {
  92   switch (result) {
  93   case kIOReturnUnderrun:
  94   case kIOReturnSuccess:
  95     return LIBUSB_SUCCESS;
  96   case kIOReturnNotOpen:
  97   case kIOReturnNoDevice:
  98     return LIBUSB_ERROR_NO_DEVICE;
  99   case kIOReturnExclusiveAccess:
 100     return LIBUSB_ERROR_ACCESS;
 101   case kIOUSBPipeStalled:
 102     return LIBUSB_ERROR_PIPE;
 103   case kIOReturnBadArgument:
 104     return LIBUSB_ERROR_INVALID_PARAM;
 105   case kIOUSBTransactionTimeout:
 106     return LIBUSB_ERROR_TIMEOUT;
 107   case kIOReturnNotResponding:
 108   case kIOReturnAborted:
 109   case kIOReturnError:
 110   case kIOUSBNoAsyncPortErr:
 111   default:
 112     return LIBUSB_ERROR_OTHER;
 113   }
 114 }
 115
 116
 117 static int ep_to_pipeRef(struct libusb_device_handle *dev_handle, uint8_t ep, uint8_t *pipep, uint8_t *ifcp) {
 118   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
 119
 120   /* current interface */
 121   struct __darwin_interface *cInterface;
 122
 123   int8_t i, iface;
 124
 125   usbi_info (HANDLE_CTX(dev_handle), "converting ep address 0x%02x to pipeRef and interface", ep);
 126
 127   for (iface = 0 ; iface < USB_MAXINTERFACES ; iface++) {
 128     cInterface = &priv->interfaces[iface];
 129
 130     if (dev_handle->claimed_interfaces & (1 << iface)) {
 131       for (i = 0 ; i < cInterface->num_endpoints ; i++) {
 132         if (cInterface->endpoint_addrs[i] == ep) {
 133           *pipep = i + 1;
 134           *ifcp = iface;
 135           usbi_info (HANDLE_CTX(dev_handle), "pipe %d on interface %d matches", *pipep, *ifcp);
 136           return 0;
 137         }
 138       }
 139     }
 140   }
 141
 142   /* No pipe found with the correct endpoint address */
 143   usbi_warn (HANDLE_CTX(dev_handle), "no pipeRef found with endpoint address 0x%02x.", ep);
 144
 145   return -1;
 146 }
 147
 148 static int usb_setup_device_iterator (io_iterator_t *deviceIterator) {
 149   return IOServiceGetMatchingServices(libusb_darwin_mp, IOServiceMatching(kIOUSBDeviceClassName), deviceIterator);
 150 }
 151
 152 static usb_device_t **usb_get_next_device (io_iterator_t deviceIterator, UInt32 *locationp) {
 153   io_cf_plugin_ref_t *plugInInterface = NULL;
 154   usb_device_t **device;
 155   io_service_t usbDevice;
 156   long result;
 157   SInt32 score;
 158
 159   if (!IOIteratorIsValid (deviceIterator))
 160     return NULL;
 161
 162
 163   while ((usbDevice = IOIteratorNext(deviceIterator))) {
 164     result = IOCreatePlugInInterfaceForService(usbDevice, kIOUSBDeviceUserClientTypeID,
 165                                                kIOCFPlugInInterfaceID, &plugInInterface,
 166                                                &score);
 167     if (kIOReturnSuccess == result && plugInInterface)
 168       break;
 169
 170     usbi_dbg ("libusb/darwin.c usb_get_next_device: could not set up plugin for service: %s\n", darwin_error_str (result));
 171   }
 172
 173   if (!usbDevice)
 174     return NULL;
 175
 176   (void)IOObjectRelease(usbDevice);
 177   (void)(*plugInInterface)->QueryInterface(plugInInterface, CFUUIDGetUUIDBytes(DeviceInterfaceID),
 178                                            (LPVOID)&device);
 179
 180   (*plugInInterface)->Stop(plugInInterface);
 181   IODestroyPlugInInterface (plugInInterface);
 182
 183   /* get the location from the device */
 184   if (locationp)
 185     (*(device))->GetLocationID(device, locationp);
 186
 187   return device;
 188 }
 189
 190 static kern_return_t darwin_get_device (uint32_t dev_location, usb_device_t ***darwin_device) {
 191   kern_return_t kresult;
 192   UInt32        location;
 193   io_iterator_t deviceIterator;
 194
 195   kresult = usb_setup_device_iterator (&deviceIterator);
 196   if (kresult)
 197     return kresult;
 198
 199   /* This port of libusb uses locations to keep track of devices. */
 200   while ((*darwin_device = usb_get_next_device (deviceIterator, &location)) != NULL) {
 201     if (location == dev_location)
 202       break;
 203
 204     (**darwin_device)->Release(*darwin_device);
 205   }
 206
 207   IOObjectRelease (deviceIterator);
 208
 209   if (!(*darwin_device))
 210     return kIOReturnNoDevice;
 211
 212   return kIOReturnSuccess;
 213 }
 214
 215
 216
 217 static void darwin_devices_detached (void *ptr, io_iterator_t rem_devices) {
 218   struct libusb_context *ctx = (struct libusb_context *)ptr;
 219   struct libusb_device_handle *handle;
 220   struct darwin_device_priv *dpriv;
 221   struct darwin_device_handle_priv *priv;
 222
 223   io_service_t device;
 224   long location;
 225   CFTypeRef locationCF;
 226   UInt32 message;
 227
 228   usbi_info (ctx, "a device has been detached");
 229
 230   while ((device = IOIteratorNext (rem_devices)) != 0) {
 231     /* get the location from the i/o registry */
 232     locationCF = IORegistryEntryCreateCFProperty (device, CFSTR(kUSBDevicePropertyLocationID), kCFAllocatorDefault, 0);
 233
 234     CFNumberGetValue(locationCF, kCFNumberLongType, &location);
 235     CFRelease (locationCF);
 236     IOObjectRelease (device);
 237
 238     usbi_mutex_lock(&ctx->open_devs_lock);
 239     list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
 240       dpriv = (struct darwin_device_priv *)handle->dev->os_priv;
 241
 242       /* the device may have been opened several times. write to each handle's event descriptor */
 243       if (dpriv->location == location  && handle->os_priv) {
 244         priv  = (struct darwin_device_handle_priv *)handle->os_priv;
 245
 246         message = MESSAGE_DEVICE_GONE;
 247         write (priv->fds[1], &message, sizeof (message));
 248       }
 249     }
 250
 251     usbi_mutex_unlock(&ctx->open_devs_lock);
 252   }
 253 }
 254
 255 static void darwin_clear_iterator (io_iterator_t iter) {
 256   io_service_t device;
 257
 258   while ((device = IOIteratorNext (iter)) != 0)
 259     IOObjectRelease (device);
 260 }
 261
 262 static void *event_thread_main (void *arg0) {
 263   IOReturn kresult;
 264   struct libusb_context *ctx = (struct libusb_context *)arg0;
 265
 266   /* hotplug (device removal) source */
 267   CFRunLoopSourceRef     libusb_notification_cfsource;
 268   io_notification_port_t libusb_notification_port;
 269   io_iterator_t          libusb_rem_device_iterator;
 270
 271   usbi_info (ctx, "creating hotplug event source");
 272
 273   CFRetain (CFRunLoopGetCurrent ());
 274
 275   /* add the notification port to the run loop */
 276   libusb_notification_port     = IONotificationPortCreate (libusb_darwin_mp);
 277   libusb_notification_cfsource = IONotificationPortGetRunLoopSource (libusb_notification_port);
 278   CFRunLoopAddSource(CFRunLoopGetCurrent (), libusb_notification_cfsource, kCFRunLoopDefaultMode);
 279
 280   /* create notifications for removed devices */
 281   kresult = IOServiceAddMatchingNotification (libusb_notification_port, kIOTerminatedNotification,
 282                                               IOServiceMatching(kIOUSBDeviceClassName),
 283                                               (IOServiceMatchingCallback)darwin_devices_detached,
 284                                               (void *)ctx, &libusb_rem_device_iterator);
 285
 286   if (kresult != kIOReturnSuccess) {
 287     usbi_err (ctx, "could not add hotplug event source: %s", darwin_error_str (kresult));
 288
 289     pthread_exit ((void *)kresult);
 290   }
 291
 292   /* arm notifiers */
 293   darwin_clear_iterator (libusb_rem_device_iterator);
 294
 295   /* let the main thread know about the async runloop */
 296   libusb_darwin_acfl = CFRunLoopGetCurrent ();
 297
 298   usbi_info (ctx, "thread ready to receive events");
 299
 300   /* run the runloop */
 301   CFRunLoopRun();
 302
 303   usbi_info (ctx, "thread exiting");
 304
 305   /* delete notification port */
 306   CFRunLoopSourceInvalidate (libusb_notification_cfsource);
 307   IONotificationPortDestroy (libusb_notification_port);
 308
 309   CFRelease (CFRunLoopGetCurrent ());
 310
 311   libusb_darwin_acfl = NULL;
 312
 313   pthread_exit (0);
 314 }
 315
 316 static int darwin_init(struct libusb_context *ctx) {
 317   IOReturn kresult;
 318
 319   if (!(initCount++)) {
 320     /* Create the master port for talking to IOKit */
 321     if (!libusb_darwin_mp) {
 322       kresult = IOMasterPort (MACH_PORT_NULL, &libusb_darwin_mp);
 323
 324       if (kresult != kIOReturnSuccess || !libusb_darwin_mp)
 325         return darwin_to_libusb (kresult);
 326     }
 327
 328     pthread_create (&libusb_darwin_at, NULL, event_thread_main, (void *)ctx);
 329
 330     while (!libusb_darwin_acfl)
 331       usleep (10);
 332   }
 333
 334   return 0;
 335 }
 336
 337 static void darwin_exit (void) {
 338   if (!(--initCount)) {
 339     void *ret;
 340
 341     /* stop the async runloop */
 342     CFRunLoopStop (libusb_darwin_acfl);
 343     pthread_join (libusb_darwin_at, &ret);
 344
 345     if (libusb_darwin_mp)
 346       mach_port_deallocate(mach_task_self(), libusb_darwin_mp);
 347
 348     libusb_darwin_mp = 0;
 349   }
 350 }
 351
 352 static int darwin_get_device_descriptor(struct libusb_device *dev, unsigned char *buffer, int *host_endian) {
 353   struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
 354
 355   /* return cached copy */
 356   memmove (buffer, &(priv->dev_descriptor), DEVICE_DESC_LENGTH);
 357
 358   *host_endian = 0;
 359
 360   return 0;
 361 }
 362
 363 static int get_configuration_index (struct libusb_device *dev, int config_value) {
 364   struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
 365   UInt8 i, numConfig;
 366   IOUSBConfigurationDescriptorPtr desc;
 367   IOReturn kresult;
 368
 369   /* is there a simpler way to determine the index? */
 370   kresult = (*(priv->device))->GetNumberOfConfigurations (priv->device, &numConfig);
 371   if (kresult != kIOReturnSuccess)
 372     return darwin_to_libusb (kresult);
 373
 374   for (i = 0 ; i < numConfig ; i++) {
 375     (*(priv->device))->GetConfigurationDescriptorPtr (priv->device, i, &desc);
 376
 377     if (desc->bConfigurationValue == config_value)
 378       return i;
 379   }
 380
 381   /* configuration not found */
 382   return LIBUSB_ERROR_OTHER;
 383 }
 384
 385 static int darwin_get_active_config_descriptor(struct libusb_device *dev, unsigned char *buffer, size_t len, int *host_endian) {
 386   struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
 387   int config_index;
 388
 389   if (0 == priv->active_config)
 390     return LIBUSB_ERROR_INVALID_PARAM;
 391
 392   config_index = get_configuration_index (dev, priv->active_config);
 393   if (config_index < 0)
 394     return config_index;
 395
 396   return darwin_get_config_descriptor (dev, config_index, buffer, len, host_endian);
 397 }
 398
 399 static int darwin_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian) {
 400   struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
 401   IOUSBConfigurationDescriptorPtr desc;
 402   IOReturn kresult;
 403   usb_device_t **device = NULL;
 404
 405   if (!priv)
 406     return LIBUSB_ERROR_OTHER;
 407
 408   if (!priv->device) {
 409     kresult = darwin_get_device (priv->location, &device);
 410     if (kresult || !device) {
 411       usbi_err (DEVICE_CTX (dev), "could not find device: %s", darwin_error_str (kresult));
 412
 413       return darwin_to_libusb (kresult);
 414     }
 415
 416     /* don't have to open the device to get a config descriptor */
 417   } else
 418     device = priv->device;
 419
 420   kresult = (*device)->GetConfigurationDescriptorPtr (device, config_index, &desc);
 421   if (kresult == kIOReturnSuccess) {
 422     /* copy descriptor */
 423     if (libusb_le16_to_cpu(desc->wTotalLength) < len)
 424       len = libusb_le16_to_cpu(desc->wTotalLength);
 425
 426     memmove (buffer, desc, len);
 427
 428     /* GetConfigurationDescriptorPtr returns the descriptor in USB bus order */
 429     *host_endian = 0;
 430   }
 431
 432   if (!priv->device)
 433     (*device)->Release (device);
 434
 435   return darwin_to_libusb (kresult);
 436 }
 437
 438 /* check whether the os has configured the device */
 439 static int darwin_check_configuration (struct libusb_context *ctx, struct libusb_device *dev, usb_device_t **darwin_device) {
 440   struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
 441
 442   IOUSBConfigurationDescriptorPtr configDesc;
 443   IOUSBFindInterfaceRequest request;
 444   kern_return_t             kresult;
 445   io_iterator_t             interface_iterator;
 446   io_service_t              firstInterface;
 447
 448   if (priv->dev_descriptor.bNumConfigurations < 1) {
 449     usbi_err (ctx, "device has no configurations");
 450     return LIBUSB_ERROR_OTHER; /* no configurations at this speed so we can't use it */
 451   }
 452
 453   /* find the first configuration */
 454   kresult = (*darwin_device)->GetConfigurationDescriptorPtr (darwin_device, 0, &configDesc);
 455   priv->first_config = (kIOReturnSuccess == kresult) ? configDesc->bConfigurationValue : 1;
 456
 457   /* check if the device is already configured. there is probably a better way than iterating over the
 458      to accomplish this (the trick is we need to avoid a call to GetConfigurations since buggy devices
 459      might lock up on the device request) */
 460
 461   /* Setup the Interface Request */
 462   request.bInterfaceClass    = kIOUSBFindInterfaceDontCare;
 463   request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
 464   request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
 465   request.bAlternateSetting  = kIOUSBFindInterfaceDontCare;
 466
 467   kresult = (*(darwin_device))->CreateInterfaceIterator(darwin_device, &request, &interface_iterator);
 468   if (kresult)
 469     return darwin_to_libusb (kresult);
 470
 471   /* iterate once */
 472   firstInterface = IOIteratorNext(interface_iterator);
 473
 474   /* done with the interface iterator */
 475   IOObjectRelease(interface_iterator);
 476
 477   if (firstInterface) {
 478     IOObjectRelease (firstInterface);
 479
 480     /* device is configured */
 481     if (priv->dev_descriptor.bNumConfigurations == 1)
 482       /* to avoid problems with some devices get the configurations value from the configuration descriptor */
 483       priv->active_config = priv->first_config;
 484     else
 485       /* devices with more than one configuration should work with GetConfiguration */
 486       (*darwin_device)->GetConfiguration (darwin_device, &priv->active_config);
 487   } else
 488     /* not configured */
 489     priv->active_config = 0;
 490
 491   usbi_info (ctx, "active config: %u, first config: %u", priv->active_config, priv->first_config);
 492
 493   return 0;
 494 }
 495
 496 static int process_new_device (struct libusb_context *ctx, usb_device_t **device, UInt32 locationID, struct discovered_devs **_discdevs) {
 497   struct darwin_device_priv *priv;
 498   struct libusb_device *dev;
 499   struct discovered_devs *discdevs;
 500   UInt16                address, idVendor, idProduct;
 501   UInt8                 bDeviceClass, bDeviceSubClass;
 502   IOUSBDevRequest      req;
 503   int ret = 0, need_unref = 0;
 504
 505   do {
 506     dev = usbi_get_device_by_session_id(ctx, locationID);
 507     if (!dev) {
 508       usbi_info (ctx, "allocating new device for location 0x%08x", locationID);
 509       dev = usbi_alloc_device(ctx, locationID);
 510       need_unref = 1;
 511     } else
 512       usbi_info (ctx, "using existing device for location 0x%08x", locationID);
 513
 514     if (!dev) {
 515       ret = LIBUSB_ERROR_NO_MEM;
 516       break;
 517     }
 518
 519     priv = (struct darwin_device_priv *)dev->os_priv;
 520
 521     /* Set up request for device descriptor */
 522     req.bmRequestType = USBmakebmRequestType(kUSBIn, kUSBStandard, kUSBDevice);
 523     req.bRequest      = kUSBRqGetDescriptor;
 524     req.wValue        = kUSBDeviceDesc << 8;
 525     req.wIndex        = 0;
 526     req.wLength       = sizeof(IOUSBDeviceDescriptor);
 527     req.pData         = &(priv->dev_descriptor);
 528
 529     (*(device))->GetDeviceAddress (device, (USBDeviceAddress *)&address);
 530     (*(device))->GetDeviceProduct (device, &idProduct);
 531     (*(device))->GetDeviceVendor (device, &idVendor);
 532     (*(device))->GetDeviceClass (device, &bDeviceClass);
 533     (*(device))->GetDeviceSubClass (device, &bDeviceSubClass);
 534
 535     /**** retrieve device descriptors ****/
 536     /* according to Apple's documentation the device must be open for DeviceRequest but we may not be able to open some
 537      * devices and Apple's USB Prober doesn't bother to open the device before issuing a descriptor request */
 538     ret = (*(device))->DeviceRequest (device, &req);
 539     if (ret != kIOReturnSuccess) {
 540       int try_unsuspend = 1;
 541 #if DeviceVersion >= 320
 542       UInt32 info;
 543
 544       /* device may be suspended. unsuspend it and try again */
 545       /* IOUSBFamily 320+ provides a way to detect device suspension but earlier versions do not */
 546       (void)(*device)->GetUSBDeviceInformation (device, &info);
 547
 548       try_unsuspend = info & (1 << kUSBInformationDeviceIsSuspendedBit);
 549 #endif
 550
 551       /* the device should be open before to device is unsuspended */
 552       (void) (*device)->USBDeviceOpenSeize(device);
 553
 554       if (try_unsuspend) {
 555         /* resume the device */
 556         (void)(*device)->USBDeviceSuspend (device, 0);
 557
 558         ret = (*(device))->DeviceRequest (device, &req);
 559
 560         /* resuspend the device */
 561         (void)(*device)->USBDeviceSuspend (device, 1);
 562       }
 563
 564       (*device)->USBDeviceClose (device);
 565     }
 566
 567     if (ret != kIOReturnSuccess) {
 568       usbi_warn (ctx, "could not retrieve device descriptor: %s. skipping device", darwin_error_str (ret));
 569       ret = -1;
 570       break;
 571     }
 572
 573     /**** end: retrieve device descriptors ****/
 574
 575     /* catch buggy hubs (which appear to be virtual). Apple's own USB prober has problems with these devices. */
 576     if (libusb_le16_to_cpu (priv->dev_descriptor.idProduct) != idProduct) {
 577       /* not a valid device */
 578       usbi_warn (ctx, "idProduct from iokit (%04x) does not match idProduct in descriptor (%04x). skipping device",
 579                  idProduct, libusb_le16_to_cpu (priv->dev_descriptor.idProduct));
 580       ret = -1;
 581       break;
 582     }
 583
 584     dev->bus_number     = locationID >> 24;
 585     dev->device_address = address;
 586
 587     /* check current active configuration (and cache the first configuration value-- which may be used by claim_interface) */
 588     ret = darwin_check_configuration (ctx, dev, device);
 589     if (ret < 0)
 590       break;
 591
 592     /* save our location, we'll need this later */
 593     priv->location = locationID;
 594     snprintf(priv->sys_path, 20, "%03i-%04x-%04x-%02x-%02x", address, idVendor, idProduct, bDeviceClass, bDeviceSubClass);
 595
 596     ret = usbi_sanitize_device (dev);
 597     if (ret < 0)
 598       break;
 599
 600     /* append the device to the list of discovered devices */
 601     discdevs = discovered_devs_append(*_discdevs, dev);
 602     if (!discdevs) {
 603       ret = LIBUSB_ERROR_NO_MEM;
 604       break;
 605     }
 606
 607     *_discdevs = discdevs;
 608
 609     usbi_info (ctx, "found device with address %d at %s", dev->device_address, priv->sys_path);
 610   } while (0);
 611
 612   if (need_unref)
 613     libusb_unref_device(dev);
 614
 615   return ret;
 616 }
 617
 618 static int darwin_get_device_list(struct libusb_context *ctx, struct discovered_devs **_discdevs) {
 619   io_iterator_t        deviceIterator;
 620   usb_device_t         **device;
 621   kern_return_t        kresult;
 622   UInt32               location;
 623
 624   if (!libusb_darwin_mp)
 625     return LIBUSB_ERROR_INVALID_PARAM;
 626
 627   kresult = usb_setup_device_iterator (&deviceIterator);
 628   if (kresult != kIOReturnSuccess)
 629     return darwin_to_libusb (kresult);
 630
 631   while ((device = usb_get_next_device (deviceIterator, &location)) != NULL) {
 632     (void) process_new_device (ctx, device, location, _discdevs);
 633
 634     (*(device))->Release(device);
 635   }
 636
 637   IOObjectRelease(deviceIterator);
 638
 639   return 0;
 640 }
 641
 642 static int darwin_open (struct libusb_device_handle *dev_handle) {
 643   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
 644   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
 645   usb_device_t  **darwin_device;
 646   IOReturn kresult;
 647
 648   if (0 == dpriv->open_count) {
 649     kresult = darwin_get_device (dpriv->location, &darwin_device);
 650     if (kresult) {
 651       usbi_err (HANDLE_CTX (dev_handle), "could not find device: %s", darwin_error_str (kresult));
 652       return darwin_to_libusb (kresult);
 653     }
 654
 655     dpriv->device = darwin_device;
 656
 657     /* try to open the device */
 658     kresult = (*(dpriv->device))->USBDeviceOpenSeize (dpriv->device);
 659
 660     if (kresult != kIOReturnSuccess) {
 661       usbi_err (HANDLE_CTX (dev_handle), "USBDeviceOpen: %s", darwin_error_str(kresult));
 662
 663       switch (kresult) {
 664       case kIOReturnExclusiveAccess:
 665         /* it is possible to perform some actions on a device that is not open so do not return an error */
 666         priv->is_open = 0;
 667
 668         break;
 669       default:
 670         (*(dpriv->device))->Release (dpriv->device);
 671         dpriv->device = NULL;
 672         return darwin_to_libusb (kresult);
 673       }
 674     } else {
 675       priv->is_open = 1;
 676
 677       /* create async event source */
 678       kresult = (*(dpriv->device))->CreateDeviceAsyncEventSource (dpriv->device, &priv->cfSource);
 679
 680       CFRetain (libusb_darwin_acfl);
 681
 682       /* add the cfSource to the aync run loop */
 683       CFRunLoopAddSource(libusb_darwin_acfl, priv->cfSource, kCFRunLoopCommonModes);
 684     }
 685   }
 686
 687   /* device opened successfully */
 688   dpriv->open_count++;
 689
 690   /* create a file descriptor for notifications */
 691   pipe (priv->fds);
 692
 693   /* set the pipe to be non-blocking */
 694   fcntl (priv->fds[1], F_SETFD, O_NONBLOCK);
 695
 696   usbi_add_pollfd(HANDLE_CTX(dev_handle), priv->fds[0], POLLIN);
 697
 698   usbi_info (HANDLE_CTX (dev_handle), "device open for access");
 699
 700   return 0;
 701 }
 702
 703 static void darwin_close (struct libusb_device_handle *dev_handle) {
 704   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
 705   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
 706   IOReturn kresult;
 707   int i;
 708
 709   if (dpriv->open_count == 0) {
 710     /* something is probably very wrong if this is the case */
 711     usbi_err (HANDLE_CTX (dev_handle), "Close called on a device that was not open!\n");
 712     return;
 713   }
 714
 715   dpriv->open_count--;
 716
 717   /* make sure all interfaces are released */
 718   for (i = 0 ; i < USB_MAXINTERFACES ; i++)
 719     if (dev_handle->claimed_interfaces & (1 << i))
 720       libusb_release_interface (dev_handle, i);
 721
 722   if (0 == dpriv->open_count) {
 723     if (priv->is_open) {
 724       /* delete the device's async event source */
 725       if (priv->cfSource) {
 726         CFRunLoopRemoveSource (libusb_darwin_acfl, priv->cfSource, kCFRunLoopDefaultMode);
 727         CFRelease (priv->cfSource);
 728       }
 729
 730       /* close the device */
 731       kresult = (*(dpriv->device))->USBDeviceClose(dpriv->device);
 732       if (kresult) {
 733         /* Log the fact that we had a problem closing the file, however failing a
 734          * close isn't really an error, so return success anyway */
 735         usbi_err (HANDLE_CTX (dev_handle), "USBDeviceClose: %s", darwin_error_str(kresult));
 736       }
 737     }
 738
 739     kresult = (*(dpriv->device))->Release(dpriv->device);
 740     if (kresult) {
 741       /* Log the fact that we had a problem closing the file, however failing a
 742        * close isn't really an error, so return success anyway */
 743       usbi_err (HANDLE_CTX (dev_handle), "Release: %s", darwin_error_str(kresult));
 744     }
 745
 746     dpriv->device = NULL;
 747   }
 748
 749   /* file descriptors are maintained per-instance */
 750   usbi_remove_pollfd (HANDLE_CTX (dev_handle), priv->fds[0]);
 751   close (priv->fds[1]);
 752   close (priv->fds[0]);
 753
 754   priv->fds[0] = priv->fds[1] = -1;
 755 }
 756
 757 static int darwin_get_configuration(struct libusb_device_handle *dev_handle, int *config) {
 758   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
 759
 760   *config = (int) dpriv->active_config;
 761
 762   return 0;
 763 }
 764
 765 static int darwin_set_configuration(struct libusb_device_handle *dev_handle, int config) {
 766   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
 767   IOReturn kresult;
 768   int i;
 769
 770   /* Setting configuration will invalidate the interface, so we need
 771      to reclaim it. First, dispose of existing interfaces, if any. */
 772   for (i = 0 ; i < USB_MAXINTERFACES ; i++)
 773     if (dev_handle->claimed_interfaces & (1 << i))
 774       darwin_release_interface (dev_handle, i);
 775
 776   kresult = (*(dpriv->device))->SetConfiguration (dpriv->device, config);
 777   if (kresult != kIOReturnSuccess)
 778     return darwin_to_libusb (kresult);
 779
 780   /* Reclaim any interfaces. */
 781   for (i = 0 ; i < USB_MAXINTERFACES ; i++)
 782     if (dev_handle->claimed_interfaces & (1 << i))
 783       darwin_claim_interface (dev_handle, i);
 784
 785   dpriv->active_config = config;
 786
 787   return 0;
 788 }
 789
 790 static int darwin_get_interface (usb_device_t **darwin_device, uint8_t ifc, io_service_t *usbInterfacep) {
 791   IOUSBFindInterfaceRequest request;
 792   uint8_t                   current_interface;
 793   kern_return_t             kresult;
 794   io_iterator_t             interface_iterator;
 795
 796   *usbInterfacep = IO_OBJECT_NULL;
 797
 798   /* Setup the Interface Request */
 799   request.bInterfaceClass    = kIOUSBFindInterfaceDontCare;
 800   request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
 801   request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
 802   request.bAlternateSetting  = kIOUSBFindInterfaceDontCare;
 803
 804   kresult = (*(darwin_device))->CreateInterfaceIterator(darwin_device, &request, &interface_iterator);
 805   if (kresult)
 806     return kresult;
 807
 808   for ( current_interface = 0 ; current_interface <= ifc ; current_interface++ ) {
 809     *usbInterfacep = IOIteratorNext(interface_iterator);
 810     if (current_interface != ifc)
 811       (void) IOObjectRelease (*usbInterfacep);
 812   }
 813
 814   /* done with the interface iterator */
 815   IOObjectRelease(interface_iterator);
 816
 817   return 0;
 818 }
 819
 820 static int get_endpoints (struct libusb_device_handle *dev_handle, int iface) {
 821   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
 822
 823   /* current interface */
 824   struct __darwin_interface *cInterface = &priv->interfaces[iface];
 825
 826   kern_return_t kresult;
 827
 828   u_int8_t numep, direction, number;
 829   u_int8_t dont_care1, dont_care3;
 830   u_int16_t dont_care2;
 831   int i;
 832
 833   usbi_info (HANDLE_CTX (dev_handle), "building table of endpoints.");
 834
 835   /* retrieve the total number of endpoints on this interface */
 836   kresult = (*(cInterface->interface))->GetNumEndpoints(cInterface->interface, &numep);
 837   if (kresult) {
 838     usbi_err (HANDLE_CTX (dev_handle), "can't get number of endpoints for interface: %s", darwin_error_str(kresult));
 839     return darwin_to_libusb (kresult);
 840   }
 841
 842   /* iterate through pipe references */
 843   for (i = 1 ; i <= numep ; i++) {
 844     kresult = (*(cInterface->interface))->GetPipeProperties(cInterface->interface, i, &direction, &number, &dont_care1,
 845                                                             &dont_care2, &dont_care3);
 846
 847     if (kresult != kIOReturnSuccess) {
 848       usbi_err (HANDLE_CTX (dev_handle), "error getting pipe information for pipe %d: %s", i, darwin_error_str(kresult));
 849
 850       return darwin_to_libusb (kresult);
 851     }
 852
 853     usbi_info (HANDLE_CTX (dev_handle), "interface: %i pipe %i: dir: %i number: %i", iface, i, direction, number);
 854
 855     cInterface->endpoint_addrs[i - 1] = ((direction << 7 & LIBUSB_ENDPOINT_DIR_MASK) | (number & LIBUSB_ENDPOINT_ADDRESS_MASK));
 856   }
 857
 858   cInterface->num_endpoints = numep;
 859
 860   return 0;
 861 }
 862
 863 static int darwin_claim_interface(struct libusb_device_handle *dev_handle, int iface) {
 864   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
 865   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
 866   io_service_t          usbInterface = IO_OBJECT_NULL;
 867   IOReturn kresult;
 868   IOCFPlugInInterface **plugInInterface = NULL;
 869   SInt32                score;
 870
 871   /* current interface */
 872   struct __darwin_interface *cInterface = &priv->interfaces[iface];
 873
 874   kresult = darwin_get_interface (dpriv->device, iface, &usbInterface);
 875   if (kresult != kIOReturnSuccess)
 876     return darwin_to_libusb (kresult);
 877
 878   /* make sure we have an interface */
 879   if (!usbInterface && dpriv->first_config != 0) {
 880     usbi_info (HANDLE_CTX (dev_handle), "no interface found; setting configuration: %d", dpriv->first_config);
 881
 882     /* set the configuration */
 883     kresult = darwin_set_configuration (dev_handle, dpriv->first_config);
 884     if (kresult != LIBUSB_SUCCESS) {
 885       usbi_err (HANDLE_CTX (dev_handle), "could not set configuration");
 886       return kresult;
 887     }
 888
 889     kresult = darwin_get_interface (dpriv->device, iface, &usbInterface);
 890     if (kresult) {
 891       usbi_err (HANDLE_CTX (dev_handle), "darwin_get_interface: %s", darwin_error_str(kresult));
 892       return darwin_to_libusb (kresult);
 893     }
 894   }
 895
 896   if (!usbInterface) {
 897     usbi_err (HANDLE_CTX (dev_handle), "interface not found");
 898     return LIBUSB_ERROR_NOT_FOUND;
 899   }
 900
 901   /* get an interface to the device's interface */
 902   kresult = IOCreatePlugInInterfaceForService (usbInterface, kIOUSBInterfaceUserClientTypeID,
 903                                                kIOCFPlugInInterfaceID, &plugInInterface, &score);
 904   if (kresult) {
 905     usbi_err (HANDLE_CTX (dev_handle), "IOCreatePlugInInterfaceForService: %s", darwin_error_str(kresult));
 906     return darwin_to_libusb (kresult);
 907   }
 908
 909   if (!plugInInterface) {
 910     usbi_err (HANDLE_CTX (dev_handle), "plugin interface not found");
 911     return LIBUSB_ERROR_NOT_FOUND;
 912   }
 913
 914   /* ignore release error */
 915   (void)IOObjectRelease (usbInterface);
 916
 917   /* Do the actual claim */
 918   kresult = (*plugInInterface)->QueryInterface(plugInInterface,
 919                                                CFUUIDGetUUIDBytes(kIOUSBInterfaceInterfaceID),
 920                                                (LPVOID)&cInterface->interface);
 921   if (kresult || !cInterface->interface) {
 922     usbi_err (HANDLE_CTX (dev_handle), "QueryInterface: %s", darwin_error_str(kresult));
 923     return darwin_to_libusb (kresult);
 924   }
 925
 926   /* We no longer need the intermediate plug-in */
 927   (*plugInInterface)->Release(plugInInterface);
 928
 929   /* claim the interface */
 930   kresult = (*(cInterface->interface))->USBInterfaceOpen(cInterface->interface);
 931   if (kresult) {
 932     usbi_err (HANDLE_CTX (dev_handle), "USBInterfaceOpen: %s", darwin_error_str(kresult));
 933     return darwin_to_libusb (kresult);
 934   }
 935
 936   /* update list of endpoints */
 937   kresult = get_endpoints (dev_handle, iface);
 938   if (kresult) {
 939     /* this should not happen */
 940     darwin_release_interface (dev_handle, iface);
 941     usbi_err (HANDLE_CTX (dev_handle), "could not build endpoint table");
 942     return kresult;
 943   }
 944
 945   cInterface->cfSource = NULL;
 946
 947   /* create async event source */
 948   kresult = (*(cInterface->interface))->CreateInterfaceAsyncEventSource (cInterface->interface, &cInterface->cfSource);
 949   if (kresult != kIOReturnSuccess) {
 950     usbi_err (HANDLE_CTX (dev_handle), "could not create async event source");
 951
 952     /* can't continue without an async event source */
 953     (void)darwin_release_interface (dev_handle, iface);
 954
 955     return darwin_to_libusb (kresult);
 956   }
 957
 958   /* add the cfSource to the async thread's run loop */
 959   CFRunLoopAddSource(libusb_darwin_acfl, cInterface->cfSource, kCFRunLoopDefaultMode);
 960
 961   usbi_info (HANDLE_CTX (dev_handle), "interface opened");
 962
 963   return 0;
 964 }
 965
 966 static int darwin_release_interface(struct libusb_device_handle *dev_handle, int iface) {
 967   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
 968   IOReturn kresult;
 969
 970   /* current interface */
 971   struct __darwin_interface *cInterface = &priv->interfaces[iface];
 972
 973   /* Check to see if an interface is open */
 974   if (!cInterface->interface)
 975     return LIBUSB_SUCCESS;
 976
 977   /* clean up endpoint data */
 978   cInterface->num_endpoints = 0;
 979
 980   /* delete the interface's async event source */
 981   if (cInterface->cfSource) {
 982     CFRunLoopRemoveSource (libusb_darwin_acfl, cInterface->cfSource, kCFRunLoopDefaultMode);
 983     CFRelease (cInterface->cfSource);
 984   }
 985
 986   kresult = (*(cInterface->interface))->USBInterfaceClose(cInterface->interface);
 987   if (kresult)
 988     usbi_err (HANDLE_CTX (dev_handle), "USBInterfaceClose: %s", darwin_error_str(kresult));
 989
 990   kresult = (*(cInterface->interface))->Release(cInterface->interface);
 991   if (kresult != kIOReturnSuccess)
 992     usbi_err (HANDLE_CTX (dev_handle), "Release: %s", darwin_error_str(kresult));
 993
 994   cInterface->interface = IO_OBJECT_NULL;
 995
 996   return darwin_to_libusb (kresult);
 997 }
 998
 999 static int darwin_set_interface_altsetting(struct libusb_device_handle *dev_handle, int iface, int altsetting) {
1000   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
1001   IOReturn kresult;
1002
1003   /* current interface */
1004   struct __darwin_interface *cInterface = &priv->interfaces[iface];
1005
1006   if (!cInterface->interface)
1007     return LIBUSB_ERROR_NO_DEVICE;
1008
1009   kresult = (*(cInterface->interface))->SetAlternateInterface (cInterface->interface, altsetting);
1010   if (kresult != kIOReturnSuccess)
1011     darwin_reset_device (dev_handle);
1012
1013   /* update list of endpoints */
1014   kresult = get_endpoints (dev_handle, iface);
1015   if (kresult) {
1016     /* this should not happen */
1017     darwin_release_interface (dev_handle, iface);
1018     usbi_err (HANDLE_CTX (dev_handle), "could not build endpoint table");
1019     return kresult;
1020   }
1021
1022   return darwin_to_libusb (kresult);
1023 }
1024
1025 static int darwin_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint) {
1026   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
1027
1028   /* current interface */
1029   struct __darwin_interface *cInterface;
1030   uint8_t pipeRef, iface;
1031   IOReturn kresult;
1032
1033   /* determine the interface/endpoint to use */
1034   if (ep_to_pipeRef (dev_handle, endpoint, &pipeRef, &iface) != 0) {
1035     usbi_err (HANDLE_CTX (dev_handle), "endpoint not found on any open interface");
1036
1037     return LIBUSB_ERROR_NOT_FOUND;
1038   }
1039
1040   cInterface = &priv->interfaces[iface];
1041
1042 #if (InterfaceVersion < 190)
1043   kresult = (*(cInterface->interface))->ClearPipeStall(cInterface->interface, pipeRef);
1044 #else
1045   /* newer versions of darwin support clearing additional bits on the device's endpoint */
1046   kresult = (*(cInterface->interface))->ClearPipeStallBothEnds(cInterface->interface, pipeRef);
1047 #endif
1048   if (kresult)
1049     usbi_err (HANDLE_CTX (dev_handle), "ClearPipeStall: %s", darwin_error_str (kresult));
1050
1051   return darwin_to_libusb (kresult);
1052 }
1053
1054 static int darwin_reset_device(struct libusb_device_handle *dev_handle) {
1055   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
1056   IOReturn kresult;
1057
1058   kresult = (*(dpriv->device))->ResetDevice (dpriv->device);
1059   if (kresult)
1060     usbi_err (HANDLE_CTX (dev_handle), "ResetDevice: %s", darwin_error_str (kresult));
1061
1062   return darwin_to_libusb (kresult);
1063 }
1064
1065 static int darwin_kernel_driver_active(struct libusb_device_handle *dev_handle, int interface) {
1066   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
1067   io_service_t usbInterface;
1068   CFTypeRef driver;
1069   IOReturn kresult;
1070
1071   kresult = darwin_get_interface (dpriv->device, interface, &usbInterface);
1072   if (kresult) {
1073     usbi_err (HANDLE_CTX (dev_handle), "darwin_get_interface: %s", darwin_error_str(kresult));
1074
1075     return darwin_to_libusb (kresult);
1076   }
1077
1078   driver = IORegistryEntryCreateCFProperty (usbInterface, kIOBundleIdentifierKey, kCFAllocatorDefault, 0);
1079   IOObjectRelease (usbInterface);
1080
1081   if (driver) {
1082     CFRelease (driver);
1083
1084     return 1;
1085   }
1086
1087   /* no driver */
1088   return 0;
1089 }
1090
1091 /* attaching/detaching kernel drivers is not currently supported (maybe in the future?) */
1092 static int darwin_attach_kernel_driver (struct libusb_device_handle *dev_handle, int interface) {
1093   return LIBUSB_ERROR_NOT_SUPPORTED;
1094 }
1095
1096 static int darwin_detach_kernel_driver (struct libusb_device_handle *dev_handle, int interface) {
1097   return LIBUSB_ERROR_NOT_SUPPORTED;
1098 }
1099
1100 static void darwin_destroy_device(struct libusb_device *dev) {
1101 }
1102
1103 static int submit_bulk_transfer(struct usbi_transfer *itransfer) {
1104   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1105   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
1106
1107   IOReturn               ret;
1108   uint8_t                is_read; /* 0 = we're reading, 1 = we're writing */
1109   uint8_t                transferType;
1110   /* None of the values below are used in libusb for bulk transfers */
1111   uint8_t                direction, number, interval, pipeRef, iface;
1112   uint16_t               maxPacketSize;
1113
1114   struct __darwin_interface *cInterface;
1115
1116   /* are we reading or writing? */
1117   is_read = transfer->endpoint & LIBUSB_ENDPOINT_IN;
1118
1119   if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
1120     usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
1121
1122     return LIBUSB_ERROR_NOT_FOUND;
1123   }
1124
1125   cInterface = &priv->interfaces[iface];
1126
1127   (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number,
1128                                                  &transferType, &maxPacketSize, &interval);
1129
1130   /* submit the request */
1131   /* timeouts are unavailable on interrupt endpoints */
1132   if (transferType == kUSBInterrupt) {
1133     if (is_read)
1134       ret = (*(cInterface->interface))->ReadPipeAsync(cInterface->interface, pipeRef, transfer->buffer,
1135                                                       transfer->length, darwin_async_io_callback, itransfer);
1136     else
1137       ret = (*(cInterface->interface))->WritePipeAsync(cInterface->interface, pipeRef, transfer->buffer,
1138                                                        transfer->length, darwin_async_io_callback, itransfer);
1139   } else {
1140     if (is_read)
1141       ret = (*(cInterface->interface))->ReadPipeAsyncTO(cInterface->interface, pipeRef, transfer->buffer,
1142                                                         transfer->length, transfer->timeout, transfer->timeout,
1143                                                         darwin_async_io_callback, (void *)itransfer);
1144     else
1145       ret = (*(cInterface->interface))->WritePipeAsyncTO(cInterface->interface, pipeRef, transfer->buffer,
1146                                                          transfer->length, transfer->timeout, transfer->timeout,
1147                                                          darwin_async_io_callback, (void *)itransfer);
1148   }
1149
1150   if (ret)
1151     usbi_err (TRANSFER_CTX (transfer), "bulk transfer failed (dir = %s): %s (code = 0x%08x)", is_read ? "In" : "Out",
1152                darwin_error_str(ret), ret);
1153
1154   return darwin_to_libusb (ret);
1155 }
1156
1157 static int submit_iso_transfer(struct usbi_transfer *itransfer) {
1158   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1159   struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
1160   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
1161
1162   IOReturn                kresult;
1163   uint8_t                 is_read; /* 0 = we're writing, 1 = we're reading */
1164   uint8_t                 pipeRef, iface;
1165   UInt64                  frame;
1166   AbsoluteTime            atTime;
1167   int                     i;
1168
1169   struct __darwin_interface *cInterface;
1170
1171   /* are we reading or writing? */
1172   is_read = transfer->endpoint & LIBUSB_ENDPOINT_IN;
1173
1174   /* construct an array of IOUSBIsocFrames */
1175   tpriv->isoc_framelist = (IOUSBIsocFrame*) calloc (transfer->num_iso_packets, sizeof(IOUSBIsocFrame));
1176   if (!tpriv->isoc_framelist)
1177     return LIBUSB_ERROR_NO_MEM;
1178
1179   /* copy the frame list from the libusb descriptor (the structures differ only is member order) */
1180   for (i = 0 ; i < transfer->num_iso_packets ; i++)
1181     tpriv->isoc_framelist[i].frReqCount = transfer->iso_packet_desc[i].length;
1182
1183   /* determine the interface/endpoint to use */
1184   if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
1185     usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
1186
1187     return LIBUSB_ERROR_NOT_FOUND;
1188   }
1189
1190   cInterface = &priv->interfaces[iface];
1191
1192   /* Last but not least we need the bus frame number */
1193   kresult = (*(cInterface->interface))->GetBusFrameNumber(cInterface->interface, &frame, &atTime);
1194   if (kresult) {
1195     usbi_err (TRANSFER_CTX (transfer), "failed to get bus frame number: %d", kresult);
1196     free(tpriv->isoc_framelist);
1197     tpriv->isoc_framelist = NULL;
1198
1199     return darwin_to_libusb (kresult);
1200   }
1201
1202   /* schedule for a frame a little in the future */
1203   frame += 2;
1204
1205   /* submit the request */
1206   if (is_read)
1207     kresult = (*(cInterface->interface))->ReadIsochPipeAsync(cInterface->interface, pipeRef, transfer->buffer, frame,
1208                                                              transfer->num_iso_packets, tpriv->isoc_framelist, darwin_async_io_callback,
1209                                                              itransfer);
1210   else
1211     kresult = (*(cInterface->interface))->WriteIsochPipeAsync(cInterface->interface, pipeRef, transfer->buffer, frame,
1212                                                               transfer->num_iso_packets, tpriv->isoc_framelist, darwin_async_io_callback,
1213                                                               itransfer);
1214
1215   if (kresult != kIOReturnSuccess) {
1216     usbi_err (TRANSFER_CTX (transfer), "isochronous transfer failed (dir: %s): %s", is_read ? "In" : "Out",
1217                darwin_error_str(kresult));
1218     free (tpriv->isoc_framelist);
1219     tpriv->isoc_framelist = NULL;
1220   }
1221
1222   return darwin_to_libusb (kresult);
1223 }
1224
1225 static int submit_control_transfer(struct usbi_transfer *itransfer) {
1226   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1227   struct libusb_control_setup *setup = (struct libusb_control_setup *) transfer->buffer;
1228   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)transfer->dev_handle->dev->os_priv;
1229   struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
1230
1231   IOReturn               kresult;
1232
1233   bzero(&tpriv->req, sizeof(tpriv->req));
1234
1235   /* IOUSBDeviceInterface expects the request in cpu endianess */
1236   tpriv->req.bmRequestType     = setup->bmRequestType;
1237   tpriv->req.bRequest          = setup->bRequest;
1238   /* these values should be in bus order from libusb_fill_control_setup */
1239   tpriv->req.wValue            = OSSwapLittleToHostInt16 (setup->wValue);
1240   tpriv->req.wIndex            = OSSwapLittleToHostInt16 (setup->wIndex);
1241   tpriv->req.wLength           = OSSwapLittleToHostInt16 (setup->wLength);
1242   /* data is stored after the libusb control block */
1243   tpriv->req.pData             = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
1244   tpriv->req.completionTimeout = transfer->timeout;
1245   tpriv->req.noDataTimeout     = transfer->timeout;
1246
1247   /* all transfers in libusb-1.0 are async */
1248   kresult = (*(dpriv->device))->DeviceRequestAsyncTO(dpriv->device, &(tpriv->req), darwin_async_io_callback, itransfer);
1249
1250   if (kresult != kIOReturnSuccess)
1251     usbi_err (TRANSFER_CTX (transfer), "control request failed: %s", darwin_error_str(kresult));
1252
1253   return darwin_to_libusb (kresult);
1254 }
1255
1256 static int darwin_submit_transfer(struct usbi_transfer *itransfer) {
1257   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1258
1259   switch (transfer->type) {
1260   case LIBUSB_TRANSFER_TYPE_CONTROL:
1261     return submit_control_transfer(itransfer);
1262   case LIBUSB_TRANSFER_TYPE_BULK:
1263   case LIBUSB_TRANSFER_TYPE_INTERRUPT:
1264     return submit_bulk_transfer(itransfer);
1265   case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
1266     return submit_iso_transfer(itransfer);
1267   default:
1268     usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
1269     return LIBUSB_ERROR_INVALID_PARAM;
1270   }
1271 }
1272
1273 static int cancel_control_transfer(struct usbi_transfer *itransfer) {
1274   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1275   struct darwin_device_priv *dpriv = (struct darwin_device_priv *)transfer->dev_handle->dev->os_priv;
1276   IOReturn kresult;
1277
1278   usbi_info (ITRANSFER_CTX (itransfer), "WARNING: aborting all transactions control pipe");
1279
1280   kresult = (*(dpriv->device))->USBDeviceAbortPipeZero (dpriv->device);
1281
1282   return darwin_to_libusb (kresult);
1283 }
1284
1285 static int darwin_abort_transfers (struct usbi_transfer *itransfer) {
1286   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1287   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
1288   struct __darwin_interface *cInterface;
1289   uint8_t pipeRef, iface;
1290   IOReturn kresult;
1291
1292   if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
1293     usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
1294
1295     return LIBUSB_ERROR_NOT_FOUND;
1296   }
1297
1298   cInterface = &priv->interfaces[iface];
1299
1300   usbi_info (ITRANSFER_CTX (itransfer), "WARNING: aborting all transactions on interface %d pipe %d", iface, pipeRef);
1301
1302   /* abort transactions */
1303   (*(cInterface->interface))->AbortPipe (cInterface->interface, pipeRef);
1304
1305   usbi_info (ITRANSFER_CTX (itransfer), "calling clear pipe stall to clear the data toggle bit");
1306
1307   /* clear the data toggle bit */
1308 #if (InterfaceVersion < 190)
1309   kresult = (*(cInterface->interface))->ClearPipeStall(cInterface->interface, pipeRef);
1310 #else
1311   /* newer versions of darwin support clearing additional bits on the device's endpoint */
1312   kresult = (*(cInterface->interface))->ClearPipeStallBothEnds(cInterface->interface, pipeRef);
1313 #endif
1314
1315   return darwin_to_libusb (kresult);
1316 }
1317
1318 static int darwin_cancel_transfer(struct usbi_transfer *itransfer) {
1319   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1320
1321   switch (transfer->type) {
1322   case LIBUSB_TRANSFER_TYPE_CONTROL:
1323     return cancel_control_transfer(itransfer);
1324   case LIBUSB_TRANSFER_TYPE_BULK:
1325   case LIBUSB_TRANSFER_TYPE_INTERRUPT:
1326   case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
1327     return darwin_abort_transfers (itransfer);
1328   default:
1329     usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
1330     return LIBUSB_ERROR_INVALID_PARAM;
1331   }
1332 }
1333
1334 static void darwin_clear_transfer_priv (struct usbi_transfer *itransfer) {
1335   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1336   struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
1337
1338   if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS && tpriv->isoc_framelist) {
1339     free (tpriv->isoc_framelist);
1340     tpriv->isoc_framelist = NULL;
1341   }
1342 }
1343
1344 static void darwin_async_io_callback (void *refcon, IOReturn result, void *arg0) {
1345   struct usbi_transfer *itransfer = (struct usbi_transfer *)refcon;
1346   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1347   struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
1348   UInt32 message;
1349
1350   usbi_info (ITRANSFER_CTX (itransfer), "an async io operation has completed");
1351
1352   /* send a completion message to the device's file descriptor */
1353   message = MESSAGE_ASYNC_IO_COMPLETE;
1354   write (priv->fds[1], &message, sizeof (message));
1355   write (priv->fds[1], &itransfer, sizeof (itransfer));
1356   write (priv->fds[1], &result, sizeof (IOReturn));
1357   write (priv->fds[1], &arg0, sizeof (UInt32));
1358 }
1359
1360 static int darwin_transfer_status (struct usbi_transfer *itransfer, kern_return_t result) {
1361   switch (result) {
1362   case kIOReturnUnderrun:
1363   case kIOReturnSuccess:
1364     return LIBUSB_TRANSFER_COMPLETED;
1365   case kIOReturnAborted:
1366     return LIBUSB_TRANSFER_CANCELLED;
1367   case kIOUSBPipeStalled:
1368     usbi_warn (ITRANSFER_CTX (itransfer), "transfer error: pipe is stalled");
1369     return LIBUSB_TRANSFER_STALL;
1370   case kIOReturnOverrun:
1371     usbi_err (ITRANSFER_CTX (itransfer), "transfer error: data overrun");
1372     return LIBUSB_TRANSFER_OVERFLOW;
1373   case kIOUSBTransactionTimeout:
1374     usbi_err (ITRANSFER_CTX (itransfer), "transfer error: timed out");
1375     return LIBUSB_TRANSFER_TIMED_OUT;
1376   default:
1377     usbi_err (ITRANSFER_CTX (itransfer), "transfer error: %s (value = 0x%08x)", darwin_error_str (result), result);
1378     return LIBUSB_TRANSFER_ERROR;
1379   }
1380 }
1381
1382 static void darwin_handle_callback (struct usbi_transfer *itransfer, kern_return_t result, UInt32 io_size) {
1383   struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1384   struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
1385   int isIsoc      = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS == transfer->type;
1386   int isBulk      = LIBUSB_TRANSFER_TYPE_BULK == transfer->type;
1387   int isControl   = LIBUSB_TRANSFER_TYPE_CONTROL == transfer->type;
1388   int isInterrupt = LIBUSB_TRANSFER_TYPE_INTERRUPT == transfer->type;
1389   int i;
1390
1391   if (!isIsoc && !isBulk && !isControl && !isInterrupt) {
1392     usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
1393     return;
1394   }
1395
1396   usbi_info (ITRANSFER_CTX (itransfer), "handling %s completion with kernel status %d",
1397              isControl ? "control" : isBulk ? "bulk" : isIsoc ? "isoc" : "interrupt", result);
1398
1399   if (kIOReturnSuccess == result || kIOReturnUnderrun == result) {
1400     if (isIsoc && tpriv->isoc_framelist) {
1401       /* copy isochronous results back */
1402
1403       for (i = 0; i < transfer->num_iso_packets ; i++) {
1404         struct libusb_iso_packet_descriptor *lib_desc = &transfer->iso_packet_desc[i];
1405         lib_desc->status = darwin_to_libusb (tpriv->isoc_framelist[i].frStatus);
1406         lib_desc->actual_length = tpriv->isoc_framelist[i].frActCount;
1407       }
1408     } else if (!isIsoc)
1409       itransfer->transferred += io_size;
1410   }
1411
1412   /* it is ok to handle cancelled transfers without calling usbi_handle_transfer_cancellation (we catch timeout transfers) */
1413   usbi_handle_transfer_completion (itransfer, darwin_transfer_status (itransfer, result));
1414 }
1415
1416 static int op_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds, int num_ready) {
1417   struct usbi_transfer *itransfer;
1418   UInt32 io_size;
1419   IOReturn kresult;
1420   int i = 0, ret;
1421   UInt32 message;
1422
1423   usbi_mutex_lock(&ctx->open_devs_lock);
1424   for (i = 0; i < nfds && num_ready > 0; i++) {
1425     struct pollfd *pollfd = &fds[i];
1426     struct libusb_device_handle *handle;
1427     struct darwin_device_handle_priv *hpriv = NULL;
1428
1429     usbi_info (ctx, "checking fd %i with revents = %x", fds[i], pollfd->revents);
1430
1431     if (!pollfd->revents)
1432       continue;
1433
1434     num_ready--;
1435     list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
1436       hpriv =  (struct darwin_device_handle_priv *)handle->os_priv;
1437       if (hpriv->fds[0] == pollfd->fd)
1438         break;
1439     }
1440
1441     if (!(pollfd->revents & POLLERR)) {
1442       ret = read (hpriv->fds[0], &message, sizeof (message));
1443       if (ret < sizeof (message))
1444         continue;
1445     } else
1446       /* could not poll the device-- response is to delete the device (this seems a little heavy-handed) */
1447       message = MESSAGE_DEVICE_GONE;
1448
1449     switch (message) {
1450     case MESSAGE_DEVICE_GONE:
1451       /* remove the device's async port from the runloop */
1452       if (hpriv->cfSource) {
1453         if (libusb_darwin_acfl)
1454           CFRunLoopRemoveSource (libusb_darwin_acfl, hpriv->cfSource, kCFRunLoopDefaultMode);
1455         CFRelease (hpriv->cfSource);
1456         hpriv->cfSource = NULL;
1457       }
1458
1459       usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->fds[0]);
1460       usbi_handle_disconnect(handle);
1461
1462       /* done with this device */
1463       continue;
1464     case MESSAGE_ASYNC_IO_COMPLETE:
1465       read (hpriv->fds[0], &itransfer, sizeof (itransfer));
1466       read (hpriv->fds[0], &kresult, sizeof (IOReturn));
1467       read (hpriv->fds[0], &io_size, sizeof (UInt32));
1468
1469       darwin_handle_callback (itransfer, kresult, io_size);
1470       break;
1471     default:
1472       usbi_err (ctx, "unknown message received from device pipe");
1473     }
1474   }
1475
1476   usbi_mutex_unlock(&ctx->open_devs_lock);
1477
1478   return 0;
1479 }
1480
1481 static int darwin_clock_gettime(int clk_id, struct timespec *tp) {
1482   mach_timespec_t sys_time;
1483   clock_serv_t clock_ref;
1484
1485   switch (clk_id) {
1486   case USBI_CLOCK_REALTIME:
1487     /* CLOCK_REALTIME represents time since the epoch */
1488     host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &clock_ref);
1489     break;
1490   case USBI_CLOCK_MONOTONIC:
1491     /* use system boot time as reference for the monotonic clock */
1492     host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &clock_ref);
1493     break;
1494   default:
1495     return LIBUSB_ERROR_INVALID_PARAM;
1496   }
1497
1498   clock_get_time (clock_ref, &sys_time);
1499
1500   tp->tv_sec  = sys_time.tv_sec;
1501   tp->tv_nsec = sys_time.tv_nsec;
1502
1503   return 0;
1504 }
1505
1506 const struct usbi_os_backend darwin_backend = {
1507         .name = "Darwin",
1508         .init = darwin_init,
1509         .exit = darwin_exit,
1510         .get_device_list = darwin_get_device_list,
1511         .get_device_descriptor = darwin_get_device_descriptor,
1512         .get_active_config_descriptor = darwin_get_active_config_descriptor,
1513         .get_config_descriptor = darwin_get_config_descriptor,
1514
1515         .open = darwin_open,
1516         .close = darwin_close,
1517         .get_configuration = darwin_get_configuration,
1518         .set_configuration = darwin_set_configuration,
1519         .claim_interface = darwin_claim_interface,
1520         .release_interface = darwin_release_interface,
1521
1522         .set_interface_altsetting = darwin_set_interface_altsetting,
1523         .clear_halt = darwin_clear_halt,
1524         .reset_device = darwin_reset_device,
1525
1526         .kernel_driver_active = darwin_kernel_driver_active,
1527         .detach_kernel_driver = darwin_detach_kernel_driver,
1528         .attach_kernel_driver = darwin_attach_kernel_driver,
1529
1530         .destroy_device = darwin_destroy_device,
1531
1532         .submit_transfer = darwin_submit_transfer,
1533         .cancel_transfer = darwin_cancel_transfer,
1534         .clear_transfer_priv = darwin_clear_transfer_priv,
1535
1536         .handle_events = op_handle_events,
1537
1538         .clock_gettime = darwin_clock_gettime,
1539
1540         .device_priv_size = sizeof(struct darwin_device_priv),
1541         .device_handle_priv_size = sizeof(struct darwin_device_handle_priv),
1542         .transfer_priv_size = sizeof(struct darwin_transfer_priv),
1543         .add_iso_packet_size = 0,
1544 };
1545