libusb/os/windows_winusb.c

   1 /*
   2  * windows backend for libusb 1.0
   3  * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
   4  * Copyright © 2016-2018 Chris Dickens <christopher.a.dickens@gmail.com>
   5  * With contributions from Michael Plante, Orin Eman et al.
   6  * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
   7  * HID Reports IOCTLs inspired from HIDAPI by Alan Ott, Signal 11 Software
   8  * Hash table functions adapted from glibc, by Ulrich Drepper et al.
   9  * Major code testing contribution by Xiaofan Chen
  10  *
  11  * This library is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU Lesser General Public
  13  * License as published by the Free Software Foundation; either
  14  * version 2.1 of the License, or (at your option) any later version.
  15  *
  16  * This library is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public
  22  * License along with this library; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24  */
  25
  26 #include <config.h>
  27
  28 #include <windows.h>
  29 #include <setupapi.h>
  30 #include <ctype.h>
  31 #include <stdio.h>
  32
  33 #include "libusbi.h"
  34 #include "windows_winusb.h"
  35
  36 #define HANDLE_VALID(h) (((h) != NULL) && ((h) != INVALID_HANDLE_VALUE))
  37
  38 // The below macro is used in conjunction with safe loops.
  39 #define LOOP_BREAK(err)                         \
  40         {                                       \
  41                 r = err;                        \
  42                 continue;                       \
  43         }
  44
  45 // WinUSB-like API prototypes
  46 static bool winusbx_init(struct libusb_context *ctx);
  47 static void winusbx_exit(void);
  48 static int winusbx_open(int sub_api, struct libusb_device_handle *dev_handle);
  49 static void winusbx_close(int sub_api, struct libusb_device_handle *dev_handle);
  50 static int winusbx_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface);
  51 static int winusbx_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface);
  52 static int winusbx_release_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface);
  53 static int winusbx_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer);
  54 static int winusbx_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting);
  55 static int winusbx_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer);
  56 static int winusbx_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer);
  57 static int winusbx_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
  58 static int winusbx_cancel_transfer(int sub_api, struct usbi_transfer *itransfer);
  59 static int winusbx_reset_device(int sub_api, struct libusb_device_handle *dev_handle);
  60 static enum libusb_transfer_status winusbx_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, DWORD length);
  61 // HID API prototypes
  62 static bool hid_init(struct libusb_context *ctx);
  63 static void hid_exit(void);
  64 static int hid_open(int sub_api, struct libusb_device_handle *dev_handle);
  65 static void hid_close(int sub_api, struct libusb_device_handle *dev_handle);
  66 static int hid_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface);
  67 static int hid_release_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface);
  68 static int hid_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting);
  69 static int hid_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer);
  70 static int hid_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer);
  71 static int hid_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
  72 static int hid_reset_device(int sub_api, struct libusb_device_handle *dev_handle);
  73 static enum libusb_transfer_status hid_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, DWORD length);
  74 // Composite API prototypes
  75 static int composite_open(int sub_api, struct libusb_device_handle *dev_handle);
  76 static void composite_close(int sub_api, struct libusb_device_handle *dev_handle);
  77 static int composite_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface);
  78 static int composite_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting);
  79 static int composite_release_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface);
  80 static int composite_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer);
  81 static int composite_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer);
  82 static int composite_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer);
  83 static int composite_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint);
  84 static int composite_cancel_transfer(int sub_api, struct usbi_transfer *itransfer);
  85 static int composite_reset_device(int sub_api, struct libusb_device_handle *dev_handle);
  86 static enum libusb_transfer_status composite_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, DWORD length);
  87
  88 static usbi_mutex_t autoclaim_lock;
  89
  90 // API globals
  91 static struct winusb_interface WinUSBX[SUB_API_MAX];
  92 #define CHECK_WINUSBX_AVAILABLE(sub_api)                \
  93         do {                                            \
  94                 if (sub_api == SUB_API_NOTSET)          \
  95                         sub_api = priv->sub_api;        \
  96                 if (WinUSBX[sub_api].hDll == NULL)      \
  97                         return LIBUSB_ERROR_ACCESS;     \
  98         } while (0)
  99
 100 #define CHECK_HID_AVAILABLE                             \
 101         do {                                            \
 102                 if (DLL_HANDLE_NAME(hid) == NULL)       \
 103                         return LIBUSB_ERROR_ACCESS;     \
 104         } while (0)
 105
 106 #if defined(ENABLE_LOGGING)
 107 static const char *guid_to_string(const GUID *guid, char guid_string[MAX_GUID_STRING_LENGTH])
 108 {
 109         if (guid == NULL) {
 110                 guid_string[0] = '\0';
 111                 return guid_string;
 112         }
 113
 114         sprintf(guid_string, "{%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}",
 115                 (unsigned int)guid->Data1, guid->Data2, guid->Data3,
 116                 guid->Data4[0], guid->Data4[1], guid->Data4[2], guid->Data4[3],
 117                 guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]);
 118
 119         return guid_string;
 120 }
 121 #endif
 122
 123 static bool string_to_guid(const char guid_string[MAX_GUID_STRING_LENGTH], GUID *guid)
 124 {
 125         unsigned short tmp[4];
 126         int num_chars = -1;
 127         char extra;
 128         int r;
 129
 130         // Unfortunately MinGW complains that '%hhx' is not a valid format specifier,
 131         // even though Visual Studio 2013 and later support it. Rather than complicating
 132         // the logic in this function with '#ifdef's, use a temporary array on the stack
 133         // to store the conversions.
 134         r = sscanf(guid_string, "{%8x-%4hx-%4hx-%4hx-%4hx%4hx%4hx}%n%c",
 135                 (unsigned int *)&guid->Data1, &guid->Data2, &guid->Data3,
 136                 &tmp[0], &tmp[1], &tmp[2], &tmp[3], &num_chars, &extra);
 137
 138         if ((r != 7) || (num_chars != 38))
 139                 return false;
 140
 141         // Extract the bytes from the 2-byte shorts
 142         guid->Data4[0] = (unsigned char)((tmp[0] >> 8) & 0xFF);
 143         guid->Data4[1] = (unsigned char)(tmp[0] & 0xFF);
 144         guid->Data4[2] = (unsigned char)((tmp[1] >> 8) & 0xFF);
 145         guid->Data4[3] = (unsigned char)(tmp[1] & 0xFF);
 146         guid->Data4[4] = (unsigned char)((tmp[2] >> 8) & 0xFF);
 147         guid->Data4[5] = (unsigned char)(tmp[2] & 0xFF);
 148         guid->Data4[6] = (unsigned char)((tmp[3] >> 8) & 0xFF);
 149         guid->Data4[7] = (unsigned char)(tmp[3] & 0xFF);
 150
 151         return true;
 152 }
 153
 154 /*
 155  * Normalize Microsoft's paths: return a duplicate of the given path
 156  * with all characters converted to uppercase
 157  */
 158 static char *normalize_path(const char *path)
 159 {
 160         char *ret_path = _strdup(path);
 161         char *p;
 162
 163         if (ret_path == NULL)
 164                 return NULL;
 165
 166         for (p = ret_path; *p != '\0'; p++)
 167                 *p = (char)toupper((unsigned char)*p);
 168
 169         return ret_path;
 170 }
 171
 172 /*
 173  * Cfgmgr32, AdvAPI32, OLE32 and SetupAPI DLL functions
 174  */
 175 static bool init_dlls(struct libusb_context *ctx)
 176 {
 177         DLL_GET_HANDLE(ctx, Cfgmgr32);
 178         DLL_LOAD_FUNC(Cfgmgr32, CM_Get_Parent, true);
 179         DLL_LOAD_FUNC(Cfgmgr32, CM_Get_Child, true);
 180
 181         // Prefixed to avoid conflict with header files
 182         DLL_GET_HANDLE(ctx, AdvAPI32);
 183         DLL_LOAD_FUNC_PREFIXED(AdvAPI32, p, RegQueryValueExA, true);
 184         DLL_LOAD_FUNC_PREFIXED(AdvAPI32, p, RegCloseKey, true);
 185
 186         DLL_GET_HANDLE(ctx, SetupAPI);
 187         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiGetClassDevsA, true);
 188         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiEnumDeviceInfo, true);
 189         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiEnumDeviceInterfaces, true);
 190         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiGetDeviceInstanceIdA, true);
 191         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiGetDeviceInterfaceDetailA, true);
 192         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiGetDeviceRegistryPropertyA, true);
 193         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiDestroyDeviceInfoList, true);
 194         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiOpenDevRegKey, true);
 195         DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiOpenDeviceInterfaceRegKey, true);
 196
 197         return true;
 198 }
 199
 200 static void exit_dlls(void)
 201 {
 202         DLL_FREE_HANDLE(SetupAPI);
 203         DLL_FREE_HANDLE(AdvAPI32);
 204         DLL_FREE_HANDLE(Cfgmgr32);
 205 }
 206
 207 /*
 208  * enumerate interfaces for the whole USB class
 209  *
 210  * Parameters:
 211  * dev_info: a pointer to a dev_info list
 212  * dev_info_data: a pointer to an SP_DEVINFO_DATA to be filled (or NULL if not needed)
 213  * enumerator: the generic USB class for which to retrieve interface details
 214  * index: zero based index of the interface in the device info list
 215  *
 216  * Note: it is the responsibility of the caller to free the DEVICE_INTERFACE_DETAIL_DATA
 217  * structure returned and call this function repeatedly using the same guid (with an
 218  * incremented index starting at zero) until all interfaces have been returned.
 219  */
 220 static bool get_devinfo_data(struct libusb_context *ctx,
 221         HDEVINFO *dev_info, SP_DEVINFO_DATA *dev_info_data, const char *enumerator, unsigned _index)
 222 {
 223         if (_index == 0) {
 224                 *dev_info = pSetupDiGetClassDevsA(NULL, enumerator, NULL, DIGCF_PRESENT|DIGCF_ALLCLASSES);
 225                 if (*dev_info == INVALID_HANDLE_VALUE) {
 226                         usbi_err(ctx, "could not obtain device info set for PnP enumerator '%s': %s",
 227                                 enumerator, windows_error_str(0));
 228                         return false;
 229                 }
 230         }
 231
 232         dev_info_data->cbSize = sizeof(SP_DEVINFO_DATA);
 233         if (!pSetupDiEnumDeviceInfo(*dev_info, _index, dev_info_data)) {
 234                 if (GetLastError() != ERROR_NO_MORE_ITEMS)
 235                         usbi_err(ctx, "could not obtain device info data for PnP enumerator '%s' index %u: %s",
 236                                 enumerator, _index, windows_error_str(0));
 237
 238                 pSetupDiDestroyDeviceInfoList(*dev_info);
 239                 *dev_info = INVALID_HANDLE_VALUE;
 240                 return false;
 241         }
 242         return true;
 243 }
 244
 245 /*
 246  * enumerate interfaces for a specific GUID
 247  *
 248  * Parameters:
 249  * dev_info: a pointer to a dev_info list
 250  * dev_info_data: a pointer to an SP_DEVINFO_DATA to be filled (or NULL if not needed)
 251  * guid: the GUID for which to retrieve interface details
 252  * index: zero based index of the interface in the device info list
 253  *
 254  * Note: it is the responsibility of the caller to free the DEVICE_INTERFACE_DETAIL_DATA
 255  * structure returned and call this function repeatedly using the same guid (with an
 256  * incremented index starting at zero) until all interfaces have been returned.
 257  */
 258 static int get_interface_details(struct libusb_context *ctx, HDEVINFO dev_info,
 259         PSP_DEVINFO_DATA dev_info_data, LPCGUID guid, DWORD *_index, char **dev_interface_path)
 260 {
 261         SP_DEVICE_INTERFACE_DATA dev_interface_data;
 262         PSP_DEVICE_INTERFACE_DETAIL_DATA_A dev_interface_details;
 263         char guid_string[MAX_GUID_STRING_LENGTH];
 264         DWORD size;
 265
 266         dev_info_data->cbSize = sizeof(SP_DEVINFO_DATA);
 267         dev_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
 268         for (;;) {
 269                 if (!pSetupDiEnumDeviceInfo(dev_info, *_index, dev_info_data)) {
 270                         if (GetLastError() != ERROR_NO_MORE_ITEMS) {
 271                                 usbi_err(ctx, "Could not obtain device info data for %s index %lu: %s",
 272                                         guid_to_string(guid, guid_string), ULONG_CAST(*_index), windows_error_str(0));
 273                                 return LIBUSB_ERROR_OTHER;
 274                         }
 275
 276                         // No more devices
 277                         return LIBUSB_SUCCESS;
 278                 }
 279
 280                 // Always advance the index for the next iteration
 281                 (*_index)++;
 282
 283                 if (pSetupDiEnumDeviceInterfaces(dev_info, dev_info_data, guid, 0, &dev_interface_data))
 284                         break;
 285
 286                 if (GetLastError() != ERROR_NO_MORE_ITEMS) {
 287                         usbi_err(ctx, "Could not obtain interface data for %s devInst %lX: %s",
 288                                 guid_to_string(guid, guid_string), ULONG_CAST(dev_info_data->DevInst), windows_error_str(0));
 289                         return LIBUSB_ERROR_OTHER;
 290                 }
 291
 292                 // Device does not have an interface matching this GUID, skip
 293         }
 294
 295         // Read interface data (dummy + actual) to access the device path
 296         if (!pSetupDiGetDeviceInterfaceDetailA(dev_info, &dev_interface_data, NULL, 0, &size, NULL)) {
 297                 // The dummy call should fail with ERROR_INSUFFICIENT_BUFFER
 298                 if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
 299                         usbi_err(ctx, "could not access interface data (dummy) for %s devInst %lX: %s",
 300                                 guid_to_string(guid, guid_string), ULONG_CAST(dev_info_data->DevInst), windows_error_str(0));
 301                         return LIBUSB_ERROR_OTHER;
 302                 }
 303         } else {
 304                 usbi_err(ctx, "program assertion failed - http://msdn.microsoft.com/en-us/library/ms792901.aspx is wrong");
 305                 return LIBUSB_ERROR_OTHER;
 306         }
 307
 308         dev_interface_details = malloc(size);
 309         if (dev_interface_details == NULL) {
 310                 usbi_err(ctx, "could not allocate interface data for %s devInst %lX",
 311                         guid_to_string(guid, guid_string), ULONG_CAST(dev_info_data->DevInst));
 312                 return LIBUSB_ERROR_NO_MEM;
 313         }
 314
 315         dev_interface_details->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A);
 316         if (!pSetupDiGetDeviceInterfaceDetailA(dev_info, &dev_interface_data,
 317                 dev_interface_details, size, NULL, NULL)) {
 318                 usbi_err(ctx, "could not access interface data (actual) for %s devInst %lX: %s",
 319                         guid_to_string(guid, guid_string), ULONG_CAST(dev_info_data->DevInst), windows_error_str(0));
 320                 free(dev_interface_details);
 321                 return LIBUSB_ERROR_OTHER;
 322         }
 323
 324         *dev_interface_path = normalize_path(dev_interface_details->DevicePath);
 325         free(dev_interface_details);
 326
 327         if (*dev_interface_path == NULL) {
 328                 usbi_err(ctx, "could not allocate interface path for %s devInst %lX",
 329                         guid_to_string(guid, guid_string), ULONG_CAST(dev_info_data->DevInst));
 330                 return LIBUSB_ERROR_NO_MEM;
 331         }
 332
 333         return LIBUSB_SUCCESS;
 334 }
 335
 336 /* For libusb0 filter */
 337 static int get_interface_details_filter(struct libusb_context *ctx, HDEVINFO *dev_info,
 338         DWORD _index, char *filter_path, char **dev_interface_path)
 339 {
 340         const GUID *libusb0_guid = &GUID_DEVINTERFACE_LIBUSB0_FILTER;
 341         SP_DEVICE_INTERFACE_DATA dev_interface_data;
 342         PSP_DEVICE_INTERFACE_DETAIL_DATA_A dev_interface_details;
 343         HKEY hkey_dev_interface;
 344         DWORD size;
 345         int err = LIBUSB_ERROR_OTHER;
 346
 347         if (_index == 0) {
 348                 *dev_info = pSetupDiGetClassDevsA(libusb0_guid, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
 349                 if (*dev_info == INVALID_HANDLE_VALUE) {
 350                         usbi_err(ctx, "could not obtain device info set: %s", windows_error_str(0));
 351                         return LIBUSB_ERROR_OTHER;
 352                 }
 353         }
 354
 355         dev_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);
 356         if (!pSetupDiEnumDeviceInterfaces(*dev_info, NULL, libusb0_guid, _index, &dev_interface_data)) {
 357                 if (GetLastError() != ERROR_NO_MORE_ITEMS) {
 358                         usbi_err(ctx, "Could not obtain interface data for index %lu: %s",
 359                                 ULONG_CAST(_index), windows_error_str(0));
 360                         goto err_exit;
 361                 }
 362
 363                 pSetupDiDestroyDeviceInfoList(*dev_info);
 364                 *dev_info = INVALID_HANDLE_VALUE;
 365                 return LIBUSB_SUCCESS;
 366         }
 367
 368         // Read interface data (dummy + actual) to access the device path
 369         if (!pSetupDiGetDeviceInterfaceDetailA(*dev_info, &dev_interface_data, NULL, 0, &size, NULL)) {
 370                 // The dummy call should fail with ERROR_INSUFFICIENT_BUFFER
 371                 if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
 372                         usbi_err(ctx, "could not access interface data (dummy) for index %lu: %s",
 373                                 ULONG_CAST(_index), windows_error_str(0));
 374                         goto err_exit;
 375                 }
 376         } else {
 377                 usbi_err(ctx, "program assertion failed - http://msdn.microsoft.com/en-us/library/ms792901.aspx is wrong");
 378                 goto err_exit;
 379         }
 380
 381         dev_interface_details = malloc(size);
 382         if (dev_interface_details == NULL) {
 383                 usbi_err(ctx, "could not allocate interface data for index %lu", ULONG_CAST(_index));
 384                 err = LIBUSB_ERROR_NO_MEM;
 385                 goto err_exit;
 386         }
 387
 388         dev_interface_details->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A);
 389         if (!pSetupDiGetDeviceInterfaceDetailA(*dev_info, &dev_interface_data, dev_interface_details, size, NULL, NULL)) {
 390                 usbi_err(ctx, "could not access interface data (actual) for index %lu: %s",
 391                         ULONG_CAST(_index), windows_error_str(0));
 392                 free(dev_interface_details);
 393                 goto err_exit;
 394         }
 395
 396         *dev_interface_path = normalize_path(dev_interface_details->DevicePath);
 397         free(dev_interface_details);
 398
 399         if (*dev_interface_path == NULL) {
 400                 usbi_err(ctx, "could not allocate interface path for index %lu", ULONG_CAST(_index));
 401                 err = LIBUSB_ERROR_NO_MEM;
 402                 goto err_exit;
 403         }
 404
 405         // [trobinso] lookup the libusb0 symbolic index.
 406         hkey_dev_interface = pSetupDiOpenDeviceInterfaceRegKey(*dev_info, &dev_interface_data, 0, KEY_READ);
 407         if (hkey_dev_interface != INVALID_HANDLE_VALUE) {
 408                 DWORD libusb0_symboliclink_index = 0;
 409                 DWORD value_length = sizeof(DWORD);
 410                 LONG status;
 411
 412                 status = pRegQueryValueExA(hkey_dev_interface, "LUsb0", NULL, NULL,
 413                         (LPBYTE)&libusb0_symboliclink_index, &value_length);
 414                 if (status == ERROR_SUCCESS) {
 415                         if (libusb0_symboliclink_index < 256) {
 416                                 // libusb0.sys is connected to this device instance.
 417                                 // If the the device interface guid is {F9F3FF14-AE21-48A0-8A25-8011A7A931D9} then it's a filter.
 418                                 sprintf(filter_path, "\\\\.\\libusb0-%04u", (unsigned int)libusb0_symboliclink_index);
 419                                 usbi_dbg("assigned libusb0 symbolic link %s", filter_path);
 420                         } else {
 421                                 // libusb0.sys was connected to this device instance at one time; but not anymore.
 422                         }
 423                 }
 424                 pRegCloseKey(hkey_dev_interface);
 425         } else {
 426                 usbi_warn(ctx, "could not open device interface registry key for index %lu: %s",
 427                         ULONG_CAST(_index), windows_error_str(0));
 428                 // TODO: should this be an error?
 429         }
 430
 431         return LIBUSB_SUCCESS;
 432
 433 err_exit:
 434         pSetupDiDestroyDeviceInfoList(*dev_info);
 435         *dev_info = INVALID_HANDLE_VALUE;
 436         return err;
 437 }
 438
 439 /*
 440  * Returns the first known ancestor of a device
 441  */
 442 static struct libusb_device *get_ancestor(struct libusb_context *ctx,
 443         DEVINST devinst, PDEVINST _parent_devinst)
 444 {
 445         struct libusb_device *dev = NULL;
 446         DEVINST parent_devinst;
 447
 448         while (dev == NULL) {
 449                 if (CM_Get_Parent(&parent_devinst, devinst, 0) != CR_SUCCESS)
 450                         break;
 451                 devinst = parent_devinst;
 452                 dev = usbi_get_device_by_session_id(ctx, (unsigned long)devinst);
 453         }
 454
 455         if ((dev != NULL) && (_parent_devinst != NULL))
 456                 *_parent_devinst = devinst;
 457
 458         return dev;
 459 }
 460
 461 /*
 462  * Determine which interface the given endpoint address belongs to
 463  */
 464 static int get_interface_by_endpoint(struct libusb_config_descriptor *conf_desc, uint8_t ep)
 465 {
 466         const struct libusb_interface *intf;
 467         const struct libusb_interface_descriptor *intf_desc;
 468         uint8_t i, k;
 469         int j;
 470
 471         for (i = 0; i < conf_desc->bNumInterfaces; i++) {
 472                 intf = &conf_desc->interface[i];
 473                 for (j = 0; j < intf->num_altsetting; j++) {
 474                         intf_desc = &intf->altsetting[j];
 475                         for (k = 0; k < intf_desc->bNumEndpoints; k++) {
 476                                 if (intf_desc->endpoint[k].bEndpointAddress == ep) {
 477                                         usbi_dbg("found endpoint %02X on interface %d", intf_desc->bInterfaceNumber, i);
 478                                         return intf_desc->bInterfaceNumber;
 479                                 }
 480                         }
 481                 }
 482         }
 483
 484         usbi_dbg("endpoint %02X not found on any interface", ep);
 485         return LIBUSB_ERROR_NOT_FOUND;
 486 }
 487
 488 /*
 489  * Open a device and associate the HANDLE with the context's I/O completion port
 490  */
 491 static HANDLE windows_open(struct libusb_device_handle *dev_handle, const char *path, DWORD access)
 492 {
 493         struct libusb_context *ctx = HANDLE_CTX(dev_handle);
 494         struct windows_context_priv *priv = usbi_get_context_priv(ctx);
 495         HANDLE handle;
 496
 497         handle = CreateFileA(path, access, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
 498         if (handle == INVALID_HANDLE_VALUE)
 499                 return handle;
 500
 501         if (CreateIoCompletionPort(handle, priv->completion_port, (ULONG_PTR)dev_handle, 0) == NULL) {
 502                 usbi_err(ctx, "failed to associate handle to I/O completion port: %s", windows_error_str(0));
 503                 CloseHandle(handle);
 504                 return INVALID_HANDLE_VALUE;
 505         }
 506
 507         return handle;
 508 }
 509
 510 /*
 511  * Populate the endpoints addresses of the device_priv interface helper structs
 512  */
 513 static int windows_assign_endpoints(struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting)
 514 {
 515         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
 516         struct libusb_config_descriptor *conf_desc;
 517         const struct libusb_interface_descriptor *if_desc;
 518         int i, r;
 519
 520         r = libusb_get_active_config_descriptor(dev_handle->dev, &conf_desc);
 521         if (r != LIBUSB_SUCCESS) {
 522                 usbi_warn(HANDLE_CTX(dev_handle), "could not read config descriptor: error %d", r);
 523                 return r;
 524         }
 525
 526         if_desc = &conf_desc->interface[iface].altsetting[altsetting];
 527         safe_free(priv->usb_interface[iface].endpoint);
 528
 529         if (if_desc->bNumEndpoints == 0) {
 530                 usbi_dbg("no endpoints found for interface %u", iface);
 531                 libusb_free_config_descriptor(conf_desc);
 532                 priv->usb_interface[iface].current_altsetting = altsetting;
 533                 return LIBUSB_SUCCESS;
 534         }
 535
 536         priv->usb_interface[iface].endpoint = malloc(if_desc->bNumEndpoints);
 537         if (priv->usb_interface[iface].endpoint == NULL) {
 538                 libusb_free_config_descriptor(conf_desc);
 539                 return LIBUSB_ERROR_NO_MEM;
 540         }
 541
 542         priv->usb_interface[iface].nb_endpoints = if_desc->bNumEndpoints;
 543         for (i = 0; i < if_desc->bNumEndpoints; i++) {
 544                 priv->usb_interface[iface].endpoint[i] = if_desc->endpoint[i].bEndpointAddress;
 545                 usbi_dbg("(re)assigned endpoint %02X to interface %u", priv->usb_interface[iface].endpoint[i], iface);
 546         }
 547         libusb_free_config_descriptor(conf_desc);
 548
 549         // Extra init may be required to configure endpoints
 550         if (priv->apib->configure_endpoints)
 551                 r = priv->apib->configure_endpoints(SUB_API_NOTSET, dev_handle, iface);
 552
 553         if (r == LIBUSB_SUCCESS)
 554                 priv->usb_interface[iface].current_altsetting = altsetting;
 555
 556         return r;
 557 }
 558
 559 // Lookup for a match in the list of API driver names
 560 // return -1 if not found, driver match number otherwise
 561 static int get_sub_api(char *driver, int api)
 562 {
 563         const char sep_str[2] = {LIST_SEPARATOR, 0};
 564         char *tok, *tmp_str;
 565         size_t len = strlen(driver);
 566         int i;
 567
 568         if (len == 0)
 569                 return SUB_API_NOTSET;
 570
 571         tmp_str = _strdup(driver);
 572         if (tmp_str == NULL)
 573                 return SUB_API_NOTSET;
 574
 575         tok = strtok(tmp_str, sep_str);
 576         while (tok != NULL) {
 577                 for (i = 0; i < usb_api_backend[api].nb_driver_names; i++) {
 578                         if (_stricmp(tok, usb_api_backend[api].driver_name_list[i]) == 0) {
 579                                 free(tmp_str);
 580                                 return i;
 581                         }
 582                 }
 583                 tok = strtok(NULL, sep_str);
 584         }
 585
 586         free(tmp_str);
 587         return SUB_API_NOTSET;
 588 }
 589
 590 /*
 591  * auto-claiming and auto-release helper functions
 592  */
 593 static int auto_claim(struct libusb_transfer *transfer, int *interface_number, int api_type)
 594 {
 595         struct winusb_device_handle_priv *handle_priv =
 596                 get_winusb_device_handle_priv(transfer->dev_handle);
 597         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
 598         int current_interface = *interface_number;
 599         int r = LIBUSB_SUCCESS;
 600
 601         switch (api_type) {
 602         case USB_API_WINUSBX:
 603         case USB_API_HID:
 604                 break;
 605         default:
 606                 return LIBUSB_ERROR_INVALID_PARAM;
 607         }
 608
 609         usbi_mutex_lock(&autoclaim_lock);
 610         if (current_interface < 0) { // No serviceable interface was found
 611                 for (current_interface = 0; current_interface < USB_MAXINTERFACES; current_interface++) {
 612                         // Must claim an interface of the same API type
 613                         if ((priv->usb_interface[current_interface].apib->id == api_type)
 614                                         && (libusb_claim_interface(transfer->dev_handle, current_interface) == LIBUSB_SUCCESS)) {
 615                                 usbi_dbg("auto-claimed interface %d for control request", current_interface);
 616                                 if (handle_priv->autoclaim_count[current_interface] != 0)
 617                                         usbi_err(TRANSFER_CTX(transfer), "program assertion failed - autoclaim_count was nonzero");
 618                                 handle_priv->autoclaim_count[current_interface]++;
 619                                 break;
 620                         }
 621                 }
 622                 if (current_interface == USB_MAXINTERFACES) {
 623                         usbi_err(TRANSFER_CTX(transfer), "could not auto-claim any interface");
 624                         r = LIBUSB_ERROR_NOT_FOUND;
 625                 }
 626         } else {
 627                 // If we have a valid interface that was autoclaimed, we must increment
 628                 // its autoclaim count so that we can prevent an early release.
 629                 if (handle_priv->autoclaim_count[current_interface] != 0)
 630                         handle_priv->autoclaim_count[current_interface]++;
 631         }
 632         usbi_mutex_unlock(&autoclaim_lock);
 633
 634         *interface_number = current_interface;
 635         return r;
 636 }
 637
 638 static void auto_release(struct usbi_transfer *itransfer)
 639 {
 640         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
 641         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
 642         libusb_device_handle *dev_handle = transfer->dev_handle;
 643         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
 644         int r;
 645
 646         usbi_mutex_lock(&autoclaim_lock);
 647         if (handle_priv->autoclaim_count[transfer_priv->interface_number] > 0) {
 648                 handle_priv->autoclaim_count[transfer_priv->interface_number]--;
 649                 if (handle_priv->autoclaim_count[transfer_priv->interface_number] == 0) {
 650                         r = libusb_release_interface(dev_handle, transfer_priv->interface_number);
 651                         if (r == LIBUSB_SUCCESS)
 652                                 usbi_dbg("auto-released interface %d", transfer_priv->interface_number);
 653                         else
 654                                 usbi_dbg("failed to auto-release interface %d (%s)",
 655                                         transfer_priv->interface_number, libusb_error_name((enum libusb_error)r));
 656                 }
 657         }
 658         usbi_mutex_unlock(&autoclaim_lock);
 659 }
 660
 661 /*
 662  * init: libusb backend init function
 663  */
 664 static int winusb_init(struct libusb_context *ctx)
 665 {
 666         int i;
 667
 668         // Load DLL imports
 669         if (!init_dlls(ctx)) {
 670                 usbi_err(ctx, "could not resolve DLL functions");
 671                 return LIBUSB_ERROR_OTHER;
 672         }
 673
 674         // Initialize the low level APIs (we don't care about errors at this stage)
 675         for (i = 0; i < USB_API_MAX; i++) {
 676                 if (usb_api_backend[i].init && !usb_api_backend[i].init(ctx))
 677                         usbi_warn(ctx, "error initializing %s backend",
 678                                 usb_api_backend[i].designation);
 679         }
 680
 681         // We need a lock for proper auto-release
 682         usbi_mutex_init(&autoclaim_lock);
 683
 684         return LIBUSB_SUCCESS;
 685 }
 686
 687 /*
 688 * exit: libusb backend deinitialization function
 689 */
 690 static void winusb_exit(struct libusb_context *ctx)
 691 {
 692         int i;
 693
 694         UNUSED(ctx);
 695
 696         usbi_mutex_destroy(&autoclaim_lock);
 697
 698         for (i = 0; i < USB_API_MAX; i++) {
 699                 if (usb_api_backend[i].exit)
 700                         usb_api_backend[i].exit();
 701         }
 702
 703         exit_dlls();
 704 }
 705
 706 /*
 707  * fetch and cache all the config descriptors through I/O
 708  */
 709 static void cache_config_descriptors(struct libusb_device *dev, HANDLE hub_handle)
 710 {
 711         struct libusb_context *ctx = DEVICE_CTX(dev);
 712         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
 713         DWORD size, ret_size;
 714         uint8_t i, num_configurations;
 715
 716         USB_CONFIGURATION_DESCRIPTOR_SHORT cd_buf_short; // dummy request
 717         PUSB_DESCRIPTOR_REQUEST cd_buf_actual = NULL;    // actual request
 718         PUSB_CONFIGURATION_DESCRIPTOR cd_data;
 719
 720         num_configurations = dev->device_descriptor.bNumConfigurations;
 721         if (num_configurations == 0)
 722                 return;
 723
 724         assert(sizeof(USB_DESCRIPTOR_REQUEST) == USB_DESCRIPTOR_REQUEST_SIZE);
 725
 726         priv->config_descriptor = calloc(num_configurations, sizeof(PUSB_CONFIGURATION_DESCRIPTOR));
 727         if (priv->config_descriptor == NULL) {
 728                 usbi_err(ctx, "could not allocate configuration descriptor array for '%s'", priv->dev_id);
 729                 return;
 730         }
 731
 732         for (i = 0; i <= num_configurations; i++) {
 733                 safe_free(cd_buf_actual);
 734
 735                 if (i == num_configurations)
 736                         break;
 737
 738                 size = sizeof(cd_buf_short);
 739                 memset(&cd_buf_short.desc, 0, sizeof(cd_buf_short.desc));
 740
 741                 cd_buf_short.req.ConnectionIndex = (ULONG)dev->port_number;
 742                 cd_buf_short.req.SetupPacket.bmRequest = LIBUSB_ENDPOINT_IN;
 743                 cd_buf_short.req.SetupPacket.bRequest = LIBUSB_REQUEST_GET_DESCRIPTOR;
 744                 cd_buf_short.req.SetupPacket.wValue = (LIBUSB_DT_CONFIG << 8) | i;
 745                 cd_buf_short.req.SetupPacket.wIndex = 0;
 746                 cd_buf_short.req.SetupPacket.wLength = (USHORT)sizeof(USB_CONFIGURATION_DESCRIPTOR);
 747
 748                 // Dummy call to get the required data size. Initial failures are reported as info rather
 749                 // than error as they can occur for non-penalizing situations, such as with some hubs.
 750                 // coverity[tainted_data_argument]
 751                 if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION, &cd_buf_short, size,
 752                         &cd_buf_short, size, &ret_size, NULL)) {
 753                         usbi_info(ctx, "could not access configuration descriptor %u (dummy) for '%s': %s", i, priv->dev_id, windows_error_str(0));
 754                         continue;
 755                 }
 756
 757                 if ((ret_size != size) || (cd_buf_short.desc.wTotalLength < sizeof(USB_CONFIGURATION_DESCRIPTOR))) {
 758                         usbi_info(ctx, "unexpected configuration descriptor %u size (dummy) for '%s'", i, priv->dev_id);
 759                         continue;
 760                 }
 761
 762                 size = sizeof(USB_DESCRIPTOR_REQUEST) + cd_buf_short.desc.wTotalLength;
 763                 cd_buf_actual = malloc(size);
 764                 if (cd_buf_actual == NULL) {
 765                         usbi_err(ctx, "could not allocate configuration descriptor %u buffer for '%s'", i, priv->dev_id);
 766                         continue;
 767                 }
 768
 769                 // Actual call
 770                 cd_buf_actual->ConnectionIndex = (ULONG)dev->port_number;
 771                 cd_buf_actual->SetupPacket.bmRequest = LIBUSB_ENDPOINT_IN;
 772                 cd_buf_actual->SetupPacket.bRequest = LIBUSB_REQUEST_GET_DESCRIPTOR;
 773                 cd_buf_actual->SetupPacket.wValue = (LIBUSB_DT_CONFIG << 8) | i;
 774                 cd_buf_actual->SetupPacket.wIndex = 0;
 775                 cd_buf_actual->SetupPacket.wLength = cd_buf_short.desc.wTotalLength;
 776
 777                 if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION, cd_buf_actual, size,
 778                         cd_buf_actual, size, &ret_size, NULL)) {
 779                         usbi_err(ctx, "could not access configuration descriptor %u (actual) for '%s': %s", i, priv->dev_id, windows_error_str(0));
 780                         continue;
 781                 }
 782
 783                 cd_data = (PUSB_CONFIGURATION_DESCRIPTOR)((UCHAR *)cd_buf_actual + USB_DESCRIPTOR_REQUEST_SIZE);
 784
 785                 if ((size != ret_size) || (cd_data->wTotalLength != cd_buf_short.desc.wTotalLength)) {
 786                         usbi_err(ctx, "unexpected configuration descriptor %u size (actual) for '%s'", i, priv->dev_id);
 787                         continue;
 788                 }
 789
 790                 if (cd_data->bDescriptorType != LIBUSB_DT_CONFIG) {
 791                         usbi_err(ctx, "descriptor %u not a configuration descriptor for '%s'", i, priv->dev_id);
 792                         continue;
 793                 }
 794
 795                 usbi_dbg("cached config descriptor %u (bConfigurationValue=%u, %u bytes)",
 796                         i, cd_data->bConfigurationValue, cd_data->wTotalLength);
 797
 798                 // Cache the descriptor
 799                 priv->config_descriptor[i] = cd_data;
 800                 cd_buf_actual = NULL;
 801         }
 802 }
 803
 804 #define ROOT_HUB_FS_CONFIG_DESC_LENGTH          0x19
 805 #define ROOT_HUB_HS_CONFIG_DESC_LENGTH          0x19
 806 #define ROOT_HUB_SS_CONFIG_DESC_LENGTH          0x1f
 807 #define CONFIG_DESC_WTOTAL_LENGTH_OFFSET        0x02
 808 #define CONFIG_DESC_EP_MAX_PACKET_OFFSET        0x16
 809 #define CONFIG_DESC_EP_BINTERVAL_OFFSET         0x18
 810
 811 static const uint8_t root_hub_config_descriptor_template[] = {
 812         // Configuration Descriptor
 813         LIBUSB_DT_CONFIG_SIZE,          // bLength
 814         LIBUSB_DT_CONFIG,               // bDescriptorType
 815         0x00, 0x00,                     // wTotalLength (filled in)
 816         0x01,                           // bNumInterfaces
 817         0x01,                           // bConfigurationValue
 818         0x00,                           // iConfiguration
 819         0xc0,                           // bmAttributes (reserved + self-powered)
 820         0x00,                           // bMaxPower
 821         // Interface Descriptor
 822         LIBUSB_DT_INTERFACE_SIZE,       // bLength
 823         LIBUSB_DT_INTERFACE,            // bDescriptorType
 824         0x00,                           // bInterfaceNumber
 825         0x00,                           // bAlternateSetting
 826         0x01,                           // bNumEndpoints
 827         LIBUSB_CLASS_HUB,               // bInterfaceClass
 828         0x00,                           // bInterfaceSubClass
 829         0x00,                           // bInterfaceProtocol
 830         0x00,                           // iInterface
 831         // Endpoint Descriptor
 832         LIBUSB_DT_ENDPOINT_SIZE,        // bLength
 833         LIBUSB_DT_ENDPOINT,             // bDescriptorType
 834         0x81,                           // bEndpointAddress
 835         0x03,                           // bmAttributes (Interrupt)
 836         0x00, 0x00,                     // wMaxPacketSize (filled in)
 837         0x00,                           // bInterval (filled in)
 838         // SuperSpeed Endpoint Companion Descriptor
 839         LIBUSB_DT_SS_ENDPOINT_COMPANION_SIZE,   // bLength
 840         LIBUSB_DT_SS_ENDPOINT_COMPANION,        // bDescriptorType
 841         0x00,                                   // bMaxBurst
 842         0x00,                                   // bmAttributes
 843         0x02, 0x00                              // wBytesPerInterval
 844 };
 845
 846 static int alloc_root_hub_config_desc(struct libusb_device *dev, ULONG num_ports,
 847         uint8_t config_desc_length, uint8_t ep_interval)
 848 {
 849         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
 850         uint8_t *ptr;
 851
 852         priv->config_descriptor = malloc(sizeof(*priv->config_descriptor));
 853         if (priv->config_descriptor == NULL)
 854                 return LIBUSB_ERROR_NO_MEM;
 855
 856         // Most config descriptors come from cache_config_descriptors() which obtains the
 857         // descriptors from the hub using an allocated USB_DESCRIPTOR_REQUEST structure.
 858         // To avoid an extra malloc + memcpy we just hold on to the USB_DESCRIPTOR_REQUEST
 859         // structure we already have and back up the pointer in windows_device_priv_release()
 860         // when freeing the descriptors. To keep a single execution path, we need to offset
 861         // the pointer here by the same amount.
 862         ptr = malloc(USB_DESCRIPTOR_REQUEST_SIZE + config_desc_length);
 863         if (ptr == NULL)
 864                 return LIBUSB_ERROR_NO_MEM;
 865
 866         ptr += USB_DESCRIPTOR_REQUEST_SIZE;
 867
 868         memcpy(ptr, root_hub_config_descriptor_template, config_desc_length);
 869         ptr[CONFIG_DESC_WTOTAL_LENGTH_OFFSET] = config_desc_length;
 870         ptr[CONFIG_DESC_EP_MAX_PACKET_OFFSET] = (uint8_t)((num_ports + 7) / 8);
 871         ptr[CONFIG_DESC_EP_BINTERVAL_OFFSET] = ep_interval;
 872
 873         priv->config_descriptor[0] = (PUSB_CONFIGURATION_DESCRIPTOR)ptr;
 874         priv->active_config = 1;
 875
 876         return 0;
 877 }
 878
 879 static int init_root_hub(struct libusb_device *dev)
 880 {
 881         struct libusb_context *ctx = DEVICE_CTX(dev);
 882         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
 883         USB_NODE_CONNECTION_INFORMATION_EX conn_info;
 884         USB_NODE_CONNECTION_INFORMATION_EX_V2 conn_info_v2;
 885         USB_NODE_INFORMATION hub_info;
 886         enum libusb_speed speed = LIBUSB_SPEED_UNKNOWN;
 887         uint8_t config_desc_length;
 888         uint8_t ep_interval;
 889         HANDLE handle;
 890         ULONG port_number, num_ports;
 891         DWORD size;
 892         int r;
 893
 894         // Determining the speed of a root hub is painful. Microsoft does not directly report the speed
 895         // capabilities of the root hub itself, only its ports and/or connected devices. Therefore we
 896         // are forced to query each individual port of the root hub to try and infer the root hub's
 897         // speed. Note that we have to query all ports because the presence of a device on that port
 898         // changes if/how Windows returns any useful speed information.
 899         handle = CreateFileA(priv->path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
 900         if (handle == INVALID_HANDLE_VALUE) {
 901                 usbi_err(ctx, "could not open root hub %s: %s", priv->path, windows_error_str(0));
 902                 return LIBUSB_ERROR_ACCESS;
 903         }
 904
 905         if (!DeviceIoControl(handle, IOCTL_USB_GET_NODE_INFORMATION, NULL, 0, &hub_info, sizeof(hub_info), &size, NULL)) {
 906                 usbi_warn(ctx, "could not get root hub info for '%s': %s", priv->dev_id, windows_error_str(0));
 907                 CloseHandle(handle);
 908                 return LIBUSB_ERROR_ACCESS;
 909         }
 910
 911         num_ports = hub_info.u.HubInformation.HubDescriptor.bNumberOfPorts;
 912         usbi_dbg("root hub '%s' reports %lu ports", priv->dev_id, ULONG_CAST(num_ports));
 913
 914         if (windows_version >= WINDOWS_8) {
 915                 // Windows 8 and later is better at reporting the speed capabilities of the root hub,
 916                 // but it is not perfect. If no device is attached to the port being queried, the
 917                 // returned information will only indicate whether that port supports USB 3.0 signalling.
 918                 // That is not enough information to distinguish between SuperSpeed and SuperSpeed Plus.
 919                 for (port_number = 1; port_number <= num_ports; port_number++) {
 920                         conn_info_v2.ConnectionIndex = port_number;
 921                         conn_info_v2.Length = sizeof(conn_info_v2);
 922                         conn_info_v2.SupportedUsbProtocols.Usb300 = 1;
 923                         if (!DeviceIoControl(handle, IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2,
 924                                 &conn_info_v2, sizeof(conn_info_v2), &conn_info_v2, sizeof(conn_info_v2), &size, NULL)) {
 925                                 usbi_warn(ctx, "could not get node connection information (V2) for root hub '%s' port %lu: %s",
 926                                         priv->dev_id, ULONG_CAST(port_number), windows_error_str(0));
 927                                 break;
 928                         }
 929
 930                         if (conn_info_v2.Flags.DeviceIsSuperSpeedPlusCapableOrHigher)
 931                                 speed = MAX(speed, LIBUSB_SPEED_SUPER_PLUS);
 932                         else if (conn_info_v2.Flags.DeviceIsSuperSpeedCapableOrHigher || conn_info_v2.SupportedUsbProtocols.Usb300)
 933                                 speed = MAX(speed, LIBUSB_SPEED_SUPER);
 934                         else if (conn_info_v2.SupportedUsbProtocols.Usb200)
 935                                 speed = MAX(speed, LIBUSB_SPEED_HIGH);
 936                         else
 937                                 speed = MAX(speed, LIBUSB_SPEED_FULL);
 938                 }
 939
 940                 if (speed != LIBUSB_SPEED_UNKNOWN)
 941                         goto make_descriptors;
 942         }
 943
 944         // At this point the speed is still not known, most likely because we are executing on
 945         // Windows 7 or earlier. The following hackery peeks into the root hub's Device ID and
 946         // tries to extract speed information from it, based on observed naming conventions.
 947         // If this does not work, we will query individual ports of the root hub.
 948         if (strstr(priv->dev_id, "ROOT_HUB31") != NULL)
 949                 speed = LIBUSB_SPEED_SUPER_PLUS;
 950         else if (strstr(priv->dev_id, "ROOT_HUB30") != NULL)
 951                 speed = LIBUSB_SPEED_SUPER;
 952         else if (strstr(priv->dev_id, "ROOT_HUB20") != NULL)
 953                 speed = LIBUSB_SPEED_HIGH;
 954
 955         if (speed != LIBUSB_SPEED_UNKNOWN)
 956                 goto make_descriptors;
 957
 958         // Windows only reports speed information about a connected device. This means that a root
 959         // hub with no connected devices or devices that are all operating at a speed less than the
 960         // highest speed that the root hub supports will not give us the correct speed.
 961         for (port_number = 1; port_number <= num_ports; port_number++) {
 962                 conn_info.ConnectionIndex = port_number;
 963                 if (!DeviceIoControl(handle, IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX, &conn_info, sizeof(conn_info),
 964                         &conn_info, sizeof(conn_info), &size, NULL)) {
 965                         usbi_warn(ctx, "could not get node connection information for root hub '%s' port %lu: %s",
 966                                 priv->dev_id, ULONG_CAST(port_number), windows_error_str(0));
 967                         continue;
 968                 }
 969
 970                 if (conn_info.ConnectionStatus != DeviceConnected)
 971                         continue;
 972
 973                 if (conn_info.Speed == UsbHighSpeed) {
 974                         speed = LIBUSB_SPEED_HIGH;
 975                         break;
 976                 }
 977         }
 978
 979 make_descriptors:
 980         CloseHandle(handle);
 981
 982         dev->device_descriptor.bLength = LIBUSB_DT_DEVICE_SIZE;
 983         dev->device_descriptor.bDescriptorType = LIBUSB_DT_DEVICE;
 984         dev->device_descriptor.bDeviceClass = LIBUSB_CLASS_HUB;
 985         if ((dev->device_descriptor.idVendor == 0) && (dev->device_descriptor.idProduct == 0)) {
 986                 dev->device_descriptor.idVendor = 0x1d6b;       // Linux Foundation
 987                 dev->device_descriptor.idProduct = (uint16_t)speed;
 988         }
 989         dev->device_descriptor.bcdDevice = 0x0100;
 990         dev->device_descriptor.bNumConfigurations = 1;
 991
 992         switch (speed) {
 993         case LIBUSB_SPEED_SUPER_PLUS:
 994                 dev->device_descriptor.bcdUSB = 0x0310;
 995                 config_desc_length = ROOT_HUB_SS_CONFIG_DESC_LENGTH;
 996                 ep_interval = 0x0c;     // 256ms
 997                 break;
 998         case LIBUSB_SPEED_SUPER:
 999                 dev->device_descriptor.bcdUSB = 0x0300;
1000                 config_desc_length = ROOT_HUB_SS_CONFIG_DESC_LENGTH;
1001                 ep_interval = 0x0c;     // 256ms
1002                 break;
1003         case LIBUSB_SPEED_HIGH:
1004                 dev->device_descriptor.bcdUSB = 0x0200;
1005                 config_desc_length = ROOT_HUB_HS_CONFIG_DESC_LENGTH;
1006                 ep_interval = 0x0c;     // 256ms
1007                 break;
1008         case LIBUSB_SPEED_LOW:          // Not used, but keeps compiler happy
1009         case LIBUSB_SPEED_UNKNOWN:
1010                 // This case means absolutely no information about this root hub was determined.
1011                 // There is not much choice than to be pessimistic and label this as a
1012                 // full-speed device.
1013                 speed = LIBUSB_SPEED_FULL;
1014                 // fallthrough
1015         case LIBUSB_SPEED_FULL:
1016                 dev->device_descriptor.bcdUSB = 0x0110;
1017                 config_desc_length = ROOT_HUB_FS_CONFIG_DESC_LENGTH;
1018                 ep_interval = 0xff;     // 255ms
1019                 break;
1020         default:                        // Impossible, buts keeps compiler happy
1021                 usbi_err(ctx, "program assertion failed - unknown root hub speed");
1022                 return LIBUSB_ERROR_INVALID_PARAM;
1023         }
1024
1025         if (speed >= LIBUSB_SPEED_SUPER) {
1026                 dev->device_descriptor.bDeviceProtocol = 0x03;  // USB 3.0 Hub
1027                 dev->device_descriptor.bMaxPacketSize0 = 0x09;  // 2^9 bytes
1028         } else {
1029                 dev->device_descriptor.bMaxPacketSize0 = 0x40;  // 64 bytes
1030         }
1031
1032         dev->speed = speed;
1033
1034         r = alloc_root_hub_config_desc(dev, num_ports, config_desc_length, ep_interval);
1035         if (r)
1036                 usbi_err(ctx, "could not allocate config descriptor for root hub '%s'", priv->dev_id);
1037
1038         return r;
1039 }
1040
1041 /*
1042  * Populate a libusb device structure
1043  */
1044 static int init_device(struct libusb_device *dev, struct libusb_device *parent_dev,
1045         uint8_t port_number, DEVINST devinst)
1046 {
1047         struct libusb_context *ctx;
1048         struct libusb_device *tmp_dev;
1049         struct winusb_device_priv *priv, *parent_priv, *tmp_priv;
1050         USB_NODE_CONNECTION_INFORMATION_EX conn_info;
1051         USB_NODE_CONNECTION_INFORMATION_EX_V2 conn_info_v2;
1052         HANDLE hub_handle;
1053         DWORD size;
1054         uint8_t bus_number, depth;
1055         int r;
1056         int ginfotimeout;
1057
1058         priv = usbi_get_device_priv(dev);
1059
1060         // If the device is already initialized, we can stop here
1061         if (priv->initialized)
1062                 return LIBUSB_SUCCESS;
1063
1064         if (parent_dev != NULL) { // Not a HCD root hub
1065                 ctx = DEVICE_CTX(dev);
1066                 parent_priv = usbi_get_device_priv(parent_dev);
1067                 if (parent_priv->apib->id != USB_API_HUB) {
1068                         usbi_warn(ctx, "parent for device '%s' is not a hub", priv->dev_id);
1069                         return LIBUSB_ERROR_NOT_FOUND;
1070                 }
1071
1072                 // Calculate depth and fetch bus number
1073                 bus_number = parent_dev->bus_number;
1074                 if (bus_number == 0) {
1075                         tmp_dev = get_ancestor(ctx, devinst, &devinst);
1076                         if (tmp_dev != parent_dev) {
1077                                 usbi_err(ctx, "program assertion failed - first ancestor is not parent");
1078                                 return LIBUSB_ERROR_NOT_FOUND;
1079                         }
1080                         libusb_unref_device(tmp_dev);
1081
1082                         for (depth = 1; bus_number == 0; depth++) {
1083                                 tmp_dev = get_ancestor(ctx, devinst, &devinst);
1084                                 if (tmp_dev == NULL) {
1085                                         usbi_warn(ctx, "ancestor for device '%s' not found at depth %u", priv->dev_id, depth);
1086                                         return LIBUSB_ERROR_NO_DEVICE;
1087                                 }
1088                                 if (tmp_dev->bus_number != 0) {
1089                                         bus_number = tmp_dev->bus_number;
1090                                         tmp_priv = usbi_get_device_priv(tmp_dev);
1091                                         depth += tmp_priv->depth;
1092                                 }
1093                                 libusb_unref_device(tmp_dev);
1094                         }
1095                 } else {
1096                         depth = parent_priv->depth + 1;
1097                 }
1098
1099                 if (bus_number == 0) {
1100                         usbi_err(ctx, "program assertion failed - bus number not found for '%s'", priv->dev_id);
1101                         return LIBUSB_ERROR_NOT_FOUND;
1102                 }
1103
1104                 dev->bus_number = bus_number;
1105                 dev->port_number = port_number;
1106                 dev->parent_dev = parent_dev;
1107                 priv->depth = depth;
1108
1109                 hub_handle = CreateFileA(parent_priv->path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
1110                 if (hub_handle == INVALID_HANDLE_VALUE) {
1111                         usbi_warn(ctx, "could not open hub %s: %s", parent_priv->path, windows_error_str(0));
1112                         return LIBUSB_ERROR_ACCESS;
1113                 }
1114
1115                 conn_info.ConnectionIndex = (ULONG)port_number;
1116                 // coverity[tainted_data_argument]
1117                 ginfotimeout = 20;
1118                 do {
1119                         if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX, &conn_info, sizeof(conn_info),
1120                                 &conn_info, sizeof(conn_info), &size, NULL)) {
1121                                 usbi_warn(ctx, "could not get node connection information for device '%s': %s",
1122                                         priv->dev_id, windows_error_str(0));
1123                                 CloseHandle(hub_handle);
1124                                 return LIBUSB_ERROR_NO_DEVICE;
1125                         }
1126
1127                         if (conn_info.ConnectionStatus == NoDeviceConnected) {
1128                                 usbi_err(ctx, "device '%s' is no longer connected!", priv->dev_id);
1129                                 CloseHandle(hub_handle);
1130                                 return LIBUSB_ERROR_NO_DEVICE;
1131                         }
1132
1133                         if ((conn_info.DeviceDescriptor.bLength != LIBUSB_DT_DEVICE_SIZE)
1134                                  || (conn_info.DeviceDescriptor.bDescriptorType != LIBUSB_DT_DEVICE)) {
1135                                 SleepEx(50, TRUE);
1136                                 continue;
1137                         }
1138
1139                         static_assert(sizeof(dev->device_descriptor) == sizeof(conn_info.DeviceDescriptor),
1140                                       "mismatch between libusb and OS device descriptor sizes");
1141                         memcpy(&dev->device_descriptor, &conn_info.DeviceDescriptor, LIBUSB_DT_DEVICE_SIZE);
1142                         usbi_localize_device_descriptor(&dev->device_descriptor);
1143
1144                         priv->active_config = conn_info.CurrentConfigurationValue;
1145                         if (priv->active_config == 0) {
1146                                 usbi_dbg("0x%x:0x%x found %u configurations (not configured)",
1147                                         dev->device_descriptor.idVendor,
1148                                         dev->device_descriptor.idProduct,
1149                                         dev->device_descriptor.bNumConfigurations);
1150                                 SleepEx(50, TRUE);
1151                         }
1152                 } while (priv->active_config == 0 && --ginfotimeout >= 0);
1153
1154                 if ((conn_info.DeviceDescriptor.bLength != LIBUSB_DT_DEVICE_SIZE)
1155                          || (conn_info.DeviceDescriptor.bDescriptorType != LIBUSB_DT_DEVICE)) {
1156                         usbi_err(ctx, "device '%s' has invalid descriptor!", priv->dev_id);
1157                         CloseHandle(hub_handle);
1158                         return LIBUSB_ERROR_OTHER;
1159                 }
1160
1161                 if (priv->active_config == 0) {
1162                         usbi_info(ctx, "0x%x:0x%x found %u configurations but device isn't configured, "
1163                                 "forcing current configuration to 1",
1164                                 dev->device_descriptor.idVendor,
1165                                 dev->device_descriptor.idProduct,
1166                                 dev->device_descriptor.bNumConfigurations);
1167                         priv->active_config = 1;
1168                 } else {
1169                         usbi_dbg("found %u configurations (current config: %u)", dev->device_descriptor.bNumConfigurations, priv->active_config);
1170                 }
1171
1172                 // Cache as many config descriptors as we can
1173                 cache_config_descriptors(dev, hub_handle);
1174
1175                 // In their great wisdom, Microsoft decided to BREAK the USB speed report between Windows 7 and Windows 8
1176                 if (windows_version >= WINDOWS_8) {
1177                         conn_info_v2.ConnectionIndex = (ULONG)port_number;
1178                         conn_info_v2.Length = sizeof(USB_NODE_CONNECTION_INFORMATION_EX_V2);
1179                         conn_info_v2.SupportedUsbProtocols.Usb300 = 1;
1180                         if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2,
1181                                 &conn_info_v2, sizeof(conn_info_v2), &conn_info_v2, sizeof(conn_info_v2), &size, NULL)) {
1182                                 usbi_warn(ctx, "could not get node connection information (V2) for device '%s': %s",
1183                                         priv->dev_id,  windows_error_str(0));
1184                         } else if (conn_info_v2.Flags.DeviceIsOperatingAtSuperSpeedPlusOrHigher) {
1185                                 conn_info.Speed = UsbSuperSpeedPlus;
1186                         } else if (conn_info_v2.Flags.DeviceIsOperatingAtSuperSpeedOrHigher) {
1187                                 conn_info.Speed = UsbSuperSpeed;
1188                         }
1189                 }
1190
1191                 CloseHandle(hub_handle);
1192
1193                 if (conn_info.DeviceAddress > UINT8_MAX)
1194                         usbi_err(ctx, "program assertion failed - device address overflow");
1195
1196                 dev->device_address = (uint8_t)conn_info.DeviceAddress;
1197
1198                 switch (conn_info.Speed) {
1199                 case UsbLowSpeed: dev->speed = LIBUSB_SPEED_LOW; break;
1200                 case UsbFullSpeed: dev->speed = LIBUSB_SPEED_FULL; break;
1201                 case UsbHighSpeed: dev->speed = LIBUSB_SPEED_HIGH; break;
1202                 case UsbSuperSpeed: dev->speed = LIBUSB_SPEED_SUPER; break;
1203                 case UsbSuperSpeedPlus: dev->speed = LIBUSB_SPEED_SUPER_PLUS; break;
1204                 default:
1205                         usbi_warn(ctx, "unknown device speed %u", conn_info.Speed);
1206                         break;
1207                 }
1208         } else {
1209                 r = init_root_hub(dev);
1210                 if (r)
1211                         return r;
1212         }
1213
1214         r = usbi_sanitize_device(dev);
1215         if (r)
1216                 return r;
1217
1218         priv->initialized = true;
1219
1220         usbi_dbg("(bus: %u, addr: %u, depth: %u, port: %u): '%s'",
1221                 dev->bus_number, dev->device_address, priv->depth, dev->port_number, priv->dev_id);
1222
1223         return LIBUSB_SUCCESS;
1224 }
1225
1226 static int enumerate_hcd_root_hub(struct libusb_context *ctx, const char *dev_id,
1227         uint8_t bus_number, DEVINST devinst)
1228 {
1229         struct libusb_device *dev;
1230         struct winusb_device_priv *priv;
1231         unsigned long session_id;
1232         DEVINST child_devinst;
1233
1234         if (CM_Get_Child(&child_devinst, devinst, 0) != CR_SUCCESS) {
1235                 usbi_warn(ctx, "could not get child devinst for '%s'", dev_id);
1236                 return LIBUSB_SUCCESS;
1237         }
1238
1239         session_id = (unsigned long)child_devinst;
1240         dev = usbi_get_device_by_session_id(ctx, session_id);
1241         if (dev == NULL) {
1242                 usbi_err(ctx, "program assertion failed - HCD '%s' child not found", dev_id);
1243                 return LIBUSB_SUCCESS;
1244         }
1245
1246         if (dev->bus_number == 0) {
1247                 // Only do this once
1248                 usbi_dbg("assigning HCD '%s' bus number %u", dev_id, bus_number);
1249                 dev->bus_number = bus_number;
1250
1251                 if (sscanf(dev_id, "PCI\\VEN_%04hx&DEV_%04hx%*s", &dev->device_descriptor.idVendor, &dev->device_descriptor.idProduct) != 2)
1252                         usbi_warn(ctx, "could not infer VID/PID of HCD root hub from '%s'", dev_id);
1253
1254                 priv = usbi_get_device_priv(dev);
1255                 priv->root_hub = true;
1256         }
1257
1258         libusb_unref_device(dev);
1259         return LIBUSB_SUCCESS;
1260 }
1261
1262 // Returns the api type, or 0 if not found/unsupported
1263 static void get_api_type(HDEVINFO *dev_info, SP_DEVINFO_DATA *dev_info_data,
1264         int *api, int *sub_api)
1265 {
1266         // Precedence for filter drivers vs driver is in the order of this array
1267         struct driver_lookup lookup[3] = {
1268                 {"\0\0", SPDRP_SERVICE, "driver"},
1269                 {"\0\0", SPDRP_UPPERFILTERS, "upper filter driver"},
1270                 {"\0\0", SPDRP_LOWERFILTERS, "lower filter driver"}
1271         };
1272         DWORD size, reg_type;
1273         unsigned k, l;
1274         int i, j;
1275
1276         // Check the service & filter names to know the API we should use
1277         for (k = 0; k < 3; k++) {
1278                 if (pSetupDiGetDeviceRegistryPropertyA(*dev_info, dev_info_data, lookup[k].reg_prop,
1279                         &reg_type, (PBYTE)lookup[k].list, MAX_KEY_LENGTH, &size)) {
1280                         // Turn the REG_SZ SPDRP_SERVICE into REG_MULTI_SZ
1281                         if (lookup[k].reg_prop == SPDRP_SERVICE)
1282                                 // our buffers are MAX_KEY_LENGTH + 1 so we can overflow if needed
1283                                 lookup[k].list[strlen(lookup[k].list) + 1] = 0;
1284
1285                         // MULTI_SZ is a pain to work with. Turn it into something much more manageable
1286                         // NB: none of the driver names we check against contain LIST_SEPARATOR,
1287                         // (currently ';'), so even if an unsupported one does, it's not an issue
1288                         for (l = 0; (lookup[k].list[l] != 0) || (lookup[k].list[l + 1] != 0); l++) {
1289                                 if (lookup[k].list[l] == 0)
1290                                         lookup[k].list[l] = LIST_SEPARATOR;
1291                         }
1292                         usbi_dbg("%s(s): %s", lookup[k].designation, lookup[k].list);
1293                 } else {
1294                         if (GetLastError() != ERROR_INVALID_DATA)
1295                                 usbi_dbg("could not access %s: %s", lookup[k].designation, windows_error_str(0));
1296                         lookup[k].list[0] = 0;
1297                 }
1298         }
1299
1300         for (i = 2; i < USB_API_MAX; i++) {
1301                 for (k = 0; k < 3; k++) {
1302                         j = get_sub_api(lookup[k].list, i);
1303                         if (j >= 0) {
1304                                 usbi_dbg("matched %s name against %s", lookup[k].designation,
1305                                         (i != USB_API_WINUSBX) ? usb_api_backend[i].designation : usb_api_backend[i].driver_name_list[j]);
1306                                 *api = i;
1307                                 *sub_api = j;
1308                                 return;
1309                         }
1310                 }
1311         }
1312 }
1313
1314 static int set_composite_interface(struct libusb_context *ctx, struct libusb_device *dev,
1315         char *dev_interface_path, char *device_id, int api, int sub_api)
1316 {
1317         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
1318         int interface_number;
1319         const char *mi_str;
1320
1321         // Because MI_## are not necessarily in sequential order (some composite
1322         // devices will have only MI_00 & MI_03 for instance), we retrieve the actual
1323         // interface number from the path's MI value
1324         mi_str = strstr(device_id, "MI_");
1325         if ((mi_str != NULL) && isdigit((unsigned char)mi_str[3]) && isdigit((unsigned char)mi_str[4])) {
1326                 interface_number = ((mi_str[3] - '0') * 10) + (mi_str[4] - '0');
1327         } else {
1328                 usbi_warn(ctx, "failure to read interface number for %s, using default value", device_id);
1329                 interface_number = 0;
1330         }
1331
1332         if (interface_number >= USB_MAXINTERFACES) {
1333                 usbi_warn(ctx, "interface %d too large - ignoring interface path %s", interface_number, dev_interface_path);
1334                 return LIBUSB_ERROR_ACCESS;
1335         }
1336
1337         if (priv->usb_interface[interface_number].path != NULL) {
1338                 if (api == USB_API_HID) {
1339                         // HID devices can have multiple collections (COL##) for each MI_## interface
1340                         usbi_dbg("interface[%d] already set - ignoring HID collection: %s",
1341                                 interface_number, device_id);
1342                         return LIBUSB_ERROR_ACCESS;
1343                 }
1344                 // In other cases, just use the latest data
1345                 safe_free(priv->usb_interface[interface_number].path);
1346         }
1347
1348         usbi_dbg("interface[%d] = %s", interface_number, dev_interface_path);
1349         priv->usb_interface[interface_number].path = dev_interface_path;
1350         priv->usb_interface[interface_number].apib = &usb_api_backend[api];
1351         priv->usb_interface[interface_number].sub_api = sub_api;
1352         if ((api == USB_API_HID) && (priv->hid == NULL)) {
1353                 priv->hid = calloc(1, sizeof(struct hid_device_priv));
1354                 if (priv->hid == NULL)
1355                         return LIBUSB_ERROR_NO_MEM;
1356         }
1357
1358         return LIBUSB_SUCCESS;
1359 }
1360
1361 static int set_hid_interface(struct libusb_context *ctx, struct libusb_device *dev,
1362         char *dev_interface_path)
1363 {
1364         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
1365         uint8_t i;
1366
1367         if (priv->hid == NULL) {
1368                 usbi_err(ctx, "program assertion failed - parent is not HID");
1369                 return LIBUSB_ERROR_NO_DEVICE;
1370         } else if (priv->hid->nb_interfaces == USB_MAXINTERFACES) {
1371                 usbi_err(ctx, "program assertion failed - max USB interfaces reached for HID device");
1372                 return LIBUSB_ERROR_NO_DEVICE;
1373         }
1374
1375         for (i = 0; i < priv->hid->nb_interfaces; i++) {
1376                 if ((priv->usb_interface[i].path != NULL) && strcmp(priv->usb_interface[i].path, dev_interface_path) == 0) {
1377                         usbi_dbg("interface[%u] already set to %s", i, dev_interface_path);
1378                         return LIBUSB_ERROR_ACCESS;
1379                 }
1380         }
1381
1382         priv->usb_interface[priv->hid->nb_interfaces].path = dev_interface_path;
1383         priv->usb_interface[priv->hid->nb_interfaces].apib = &usb_api_backend[USB_API_HID];
1384         usbi_dbg("interface[%u] = %s", priv->hid->nb_interfaces, dev_interface_path);
1385         priv->hid->nb_interfaces++;
1386         return LIBUSB_SUCCESS;
1387 }
1388
1389 /*
1390  * get_device_list: libusb backend device enumeration function
1391  */
1392 static int winusb_get_device_list(struct libusb_context *ctx, struct discovered_devs **_discdevs)
1393 {
1394         struct discovered_devs *discdevs;
1395         HDEVINFO *dev_info, dev_info_intf, dev_info_enum;
1396         SP_DEVINFO_DATA dev_info_data;
1397         DWORD _index = 0;
1398         GUID hid_guid;
1399         int r = LIBUSB_SUCCESS;
1400         int api, sub_api;
1401         unsigned int pass, i, j;
1402         char enumerator[16];
1403         char dev_id[MAX_PATH_LENGTH];
1404         struct libusb_device *dev, *parent_dev;
1405         struct winusb_device_priv *priv, *parent_priv;
1406         char *dev_interface_path = NULL;
1407         unsigned long session_id;
1408         DWORD size, port_nr, reg_type, install_state;
1409         HKEY key;
1410         char guid_string[MAX_GUID_STRING_LENGTH];
1411         GUID *if_guid;
1412         LONG s;
1413 #define HUB_PASS 0
1414 #define DEV_PASS 1
1415 #define HCD_PASS 2
1416 #define GEN_PASS 3
1417 #define HID_PASS 4
1418 #define EXT_PASS 5
1419         // Keep a list of guids that will be enumerated
1420 #define GUID_SIZE_STEP 8
1421         const GUID **guid_list, **new_guid_list;
1422         unsigned int guid_size = GUID_SIZE_STEP;
1423         unsigned int nb_guids;
1424         // Keep a list of PnP enumerator strings that are found
1425         const char *usb_enumerator[8] = { "USB" };
1426         unsigned int nb_usb_enumerators = 1;
1427         unsigned int usb_enum_index = 0;
1428         // Keep a list of newly allocated devs to unref
1429 #define UNREF_SIZE_STEP 16
1430         libusb_device **unref_list, **new_unref_list;
1431         unsigned int unref_size = UNREF_SIZE_STEP;
1432         unsigned int unref_cur = 0;
1433
1434         // PASS 1 : (re)enumerate HCDs (allows for HCD hotplug)
1435         // PASS 2 : (re)enumerate HUBS
1436         // PASS 3 : (re)enumerate generic USB devices (including driverless)
1437         //           and list additional USB device interface GUIDs to explore
1438         // PASS 4 : (re)enumerate master USB devices that have a device interface
1439         // PASS 5+: (re)enumerate device interfaced GUIDs (including HID) and
1440         //           set the device interfaces.
1441
1442         // Init the GUID table
1443         guid_list = malloc(guid_size * sizeof(void *));
1444         if (guid_list == NULL) {
1445                 usbi_err(ctx, "failed to alloc guid list");
1446                 return LIBUSB_ERROR_NO_MEM;
1447         }
1448
1449         guid_list[HUB_PASS] = &GUID_DEVINTERFACE_USB_HUB;
1450         guid_list[DEV_PASS] = &GUID_DEVINTERFACE_USB_DEVICE;
1451         guid_list[HCD_PASS] = &GUID_DEVINTERFACE_USB_HOST_CONTROLLER;
1452         guid_list[GEN_PASS] = NULL;
1453         if (HidD_GetHidGuid != NULL) {
1454                 HidD_GetHidGuid(&hid_guid);
1455                 guid_list[HID_PASS] = &hid_guid;
1456         } else {
1457                 guid_list[HID_PASS] = NULL;
1458         }
1459         nb_guids = EXT_PASS;
1460
1461         unref_list = malloc(unref_size * sizeof(void *));
1462         if (unref_list == NULL) {
1463                 usbi_err(ctx, "failed to alloc unref list");
1464                 free((void *)guid_list);
1465                 return LIBUSB_ERROR_NO_MEM;
1466         }
1467
1468         dev_info_intf = pSetupDiGetClassDevsA(NULL, NULL, NULL, DIGCF_ALLCLASSES | DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
1469         if (dev_info_intf == INVALID_HANDLE_VALUE) {
1470                 usbi_err(ctx, "failed to obtain device info list: %s", windows_error_str(0));
1471                 free(unref_list);
1472                 free((void *)guid_list);
1473                 return LIBUSB_ERROR_OTHER;
1474         }
1475
1476         for (pass = 0; ((pass < nb_guids) && (r == LIBUSB_SUCCESS)); pass++) {
1477 //#define ENUM_DEBUG
1478 #if defined(ENABLE_LOGGING) && defined(ENUM_DEBUG)
1479                 const char * const passname[] = {"HUB", "DEV", "HCD", "GEN", "HID", "EXT"};
1480                 usbi_dbg("#### PROCESSING %ss %s", passname[MIN(pass, EXT_PASS)], guid_to_string(guid_list[pass], guid_string));
1481 #endif
1482                 if ((pass == HID_PASS) && (guid_list[HID_PASS] == NULL))
1483                         continue;
1484
1485                 dev_info = (pass != GEN_PASS) ? &dev_info_intf : &dev_info_enum;
1486
1487                 for (i = 0; ; i++) {
1488                         // safe loop: free up any (unprotected) dynamic resource
1489                         // NB: this is always executed before breaking the loop
1490                         safe_free(dev_interface_path);
1491                         priv = parent_priv = NULL;
1492                         dev = parent_dev = NULL;
1493
1494                         // Safe loop: end of loop conditions
1495                         if (r != LIBUSB_SUCCESS)
1496                                 break;
1497
1498                         if ((pass == HCD_PASS) && (i == UINT8_MAX)) {
1499                                 usbi_warn(ctx, "program assertion failed - found more than %u buses, skipping the rest", UINT8_MAX);
1500                                 break;
1501                         }
1502
1503                         if (pass != GEN_PASS) {
1504                                 // Except for GEN, all passes deal with device interfaces
1505                                 r = get_interface_details(ctx, *dev_info, &dev_info_data, guid_list[pass], &_index, &dev_interface_path);
1506                                 if ((r != LIBUSB_SUCCESS) || (dev_interface_path == NULL)) {
1507                                         _index = 0;
1508                                         break;
1509                                 }
1510                         } else {
1511                                 // Workaround for a Nec/Renesas USB 3.0 driver bug where root hubs are
1512                                 // being listed under the "NUSB3" PnP Symbolic Name rather than "USB".
1513                                 // The Intel USB 3.0 driver behaves similar, but uses "IUSB3"
1514                                 // The Intel Alpine Ridge USB 3.1 driver uses "IARUSB3"
1515                                 for (; usb_enum_index < nb_usb_enumerators; usb_enum_index++) {
1516                                         if (get_devinfo_data(ctx, dev_info, &dev_info_data, usb_enumerator[usb_enum_index], i))
1517                                                 break;
1518                                         i = 0;
1519                                 }
1520                                 if (usb_enum_index == nb_usb_enumerators)
1521                                         break;
1522                         }
1523
1524                         // Read the Device ID path
1525                         if (!pSetupDiGetDeviceInstanceIdA(*dev_info, &dev_info_data, dev_id, sizeof(dev_id), NULL)) {
1526                                 usbi_warn(ctx, "could not read the device instance ID for devInst %lX, skipping",
1527                                           ULONG_CAST(dev_info_data.DevInst));
1528                                 continue;
1529                         }
1530
1531 #ifdef ENUM_DEBUG
1532                         usbi_dbg("PRO: %s", dev_id);
1533 #endif
1534
1535                         // Set API to use or get additional data from generic pass
1536                         api = USB_API_UNSUPPORTED;
1537                         sub_api = SUB_API_NOTSET;
1538                         switch (pass) {
1539                         case HCD_PASS:
1540                                 break;
1541                         case HUB_PASS:
1542                                 api = USB_API_HUB;
1543                                 // Fetch the PnP enumerator class for this hub
1544                                 // This will allow us to enumerate all classes during the GEN pass
1545                                 if (!pSetupDiGetDeviceRegistryPropertyA(*dev_info, &dev_info_data, SPDRP_ENUMERATOR_NAME,
1546                                         NULL, (PBYTE)enumerator, sizeof(enumerator), NULL)) {
1547                                         usbi_err(ctx, "could not read enumerator string for device '%s': %s", dev_id, windows_error_str(0));
1548                                         LOOP_BREAK(LIBUSB_ERROR_OTHER);
1549                                 }
1550                                 for (j = 0; j < nb_usb_enumerators; j++) {
1551                                         if (strcmp(usb_enumerator[j], enumerator) == 0)
1552                                                 break;
1553                                 }
1554                                 if (j == nb_usb_enumerators) {
1555                                         usbi_dbg("found new PnP enumerator string '%s'", enumerator);
1556                                         if (nb_usb_enumerators < ARRAYSIZE(usb_enumerator)) {
1557                                                 usb_enumerator[nb_usb_enumerators] = _strdup(enumerator);
1558                                                 if (usb_enumerator[nb_usb_enumerators] != NULL) {
1559                                                         nb_usb_enumerators++;
1560                                                 } else {
1561                                                         usbi_err(ctx, "could not allocate enumerator string '%s'", enumerator);
1562                                                         LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1563                                                 }
1564                                         } else {
1565                                                 usbi_warn(ctx, "too many enumerator strings, some devices may not be accessible");
1566                                         }
1567                                 }
1568                                 break;
1569                         case GEN_PASS:
1570                                 // We use the GEN pass to detect driverless devices...
1571                                 if (!pSetupDiGetDeviceRegistryPropertyA(*dev_info, &dev_info_data, SPDRP_DRIVER,
1572                                         NULL, NULL, 0, NULL) && (GetLastError() != ERROR_INSUFFICIENT_BUFFER)) {
1573                                         usbi_info(ctx, "The following device has no driver: '%s'", dev_id);
1574                                         usbi_info(ctx, "libusb will not be able to access it");
1575                                 }
1576                                 // ...and to add the additional device interface GUIDs
1577                                 key = pSetupDiOpenDevRegKey(*dev_info, &dev_info_data, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_READ);
1578                                 if (key == INVALID_HANDLE_VALUE)
1579                                         break;
1580                                 // Look for both DeviceInterfaceGUIDs *and* DeviceInterfaceGUID, in that order
1581                                 size = sizeof(guid_string);
1582                                 s = pRegQueryValueExA(key, "DeviceInterfaceGUIDs", NULL, &reg_type,
1583                                         (LPBYTE)guid_string, &size);
1584                                 if (s == ERROR_FILE_NOT_FOUND)
1585                                         s = pRegQueryValueExA(key, "DeviceInterfaceGUID", NULL, &reg_type,
1586                                                 (LPBYTE)guid_string, &size);
1587                                 pRegCloseKey(key);
1588                                 if ((s == ERROR_SUCCESS) &&
1589                                     (((reg_type == REG_SZ) && (size == (sizeof(guid_string) - sizeof(char)))) ||
1590                                      ((reg_type == REG_MULTI_SZ) && (size == sizeof(guid_string))))) {
1591                                         if (nb_guids == guid_size) {
1592                                                 new_guid_list = realloc((void *)guid_list, (guid_size + GUID_SIZE_STEP) * sizeof(void *));
1593                                                 if (new_guid_list == NULL) {
1594                                                         usbi_err(ctx, "failed to realloc guid list");
1595                                                         LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1596                                                 }
1597                                                 guid_list = new_guid_list;
1598                                                 guid_size += GUID_SIZE_STEP;
1599                                         }
1600                                         if_guid = malloc(sizeof(*if_guid));
1601                                         if (if_guid == NULL) {
1602                                                 usbi_err(ctx, "failed to alloc if_guid");
1603                                                 LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1604                                         }
1605                                         if (!string_to_guid(guid_string, if_guid)) {
1606                                                 usbi_warn(ctx, "device '%s' has malformed DeviceInterfaceGUID string '%s', skipping", dev_id, guid_string);
1607                                                 free(if_guid);
1608                                         } else {
1609                                                 // Check if we've already seen this GUID
1610                                                 for (j = EXT_PASS; j < nb_guids; j++) {
1611                                                         if (memcmp(guid_list[j], if_guid, sizeof(*if_guid)) == 0)
1612                                                                 break;
1613                                                 }
1614                                                 if (j == nb_guids) {
1615                                                         usbi_dbg("extra GUID: %s", guid_string);
1616                                                         guid_list[nb_guids++] = if_guid;
1617                                                 } else {
1618                                                         // Duplicate, ignore
1619                                                         free(if_guid);
1620                                                 }
1621                                         }
1622                                 } else if (s == ERROR_SUCCESS) {
1623                                         usbi_warn(ctx, "unexpected type/size of DeviceInterfaceGUID for '%s'", dev_id);
1624                                 }
1625                                 break;
1626                         case HID_PASS:
1627                                 api = USB_API_HID;
1628                                 break;
1629                         default:
1630                                 // Get the API type (after checking that the driver installation is OK)
1631                                 if ((!pSetupDiGetDeviceRegistryPropertyA(*dev_info, &dev_info_data, SPDRP_INSTALL_STATE,
1632                                         NULL, (PBYTE)&install_state, sizeof(install_state), &size)) || (size != sizeof(install_state))) {
1633                                         usbi_warn(ctx, "could not detect installation state of driver for '%s': %s",
1634                                                 dev_id, windows_error_str(0));
1635                                 } else if (install_state != 0) {
1636                                         usbi_warn(ctx, "driver for device '%s' is reporting an issue (code: %lu) - skipping",
1637                                                 dev_id, ULONG_CAST(install_state));
1638                                         continue;
1639                                 }
1640                                 get_api_type(dev_info, &dev_info_data, &api, &sub_api);
1641                                 break;
1642                         }
1643
1644                         // Find parent device (for the passes that need it)
1645                         if (pass >= GEN_PASS) {
1646                                 parent_dev = get_ancestor(ctx, dev_info_data.DevInst, NULL);
1647                                 if (parent_dev == NULL) {
1648                                         // Root hubs will not have a parent
1649                                         dev = usbi_get_device_by_session_id(ctx, (unsigned long)dev_info_data.DevInst);
1650                                         if (dev != NULL) {
1651                                                 priv = usbi_get_device_priv(dev);
1652                                                 if (priv->root_hub)
1653                                                         goto track_unref;
1654                                                 libusb_unref_device(dev);
1655                                         }
1656
1657                                         usbi_dbg("unlisted ancestor for '%s' (non USB HID, newly connected, etc.) - ignoring", dev_id);
1658                                         continue;
1659                                 }
1660
1661                                 parent_priv = usbi_get_device_priv(parent_dev);
1662                                 // virtual USB devices are also listed during GEN - don't process these yet
1663                                 if ((pass == GEN_PASS) && (parent_priv->apib->id != USB_API_HUB)) {
1664                                         libusb_unref_device(parent_dev);
1665                                         continue;
1666                                 }
1667                         }
1668
1669                         // Create new or match existing device, using the devInst as session id
1670                         if ((pass <= GEN_PASS) && (pass != HCD_PASS)) { // For subsequent passes, we'll lookup the parent
1671                                 // These are the passes that create "new" devices
1672                                 session_id = (unsigned long)dev_info_data.DevInst;
1673                                 dev = usbi_get_device_by_session_id(ctx, session_id);
1674                                 if (dev == NULL) {
1675                                 alloc_device:
1676                                         usbi_dbg("allocating new device for session [%lX]", session_id);
1677                                         dev = usbi_alloc_device(ctx, session_id);
1678                                         if (dev == NULL)
1679                                                 LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1680
1681                                         priv = winusb_device_priv_init(dev);
1682                                         priv->dev_id = _strdup(dev_id);
1683                                         if (priv->dev_id == NULL) {
1684                                                 libusb_unref_device(dev);
1685                                                 LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1686                                         }
1687                                 } else {
1688                                         usbi_dbg("found existing device for session [%lX]", session_id);
1689
1690                                         priv = usbi_get_device_priv(dev);
1691                                         if (strcmp(priv->dev_id, dev_id) != 0) {
1692                                                 usbi_dbg("device instance ID for session [%lX] changed", session_id);
1693                                                 usbi_disconnect_device(dev);
1694                                                 libusb_unref_device(dev);
1695                                                 goto alloc_device;
1696                                         }
1697                                 }
1698
1699                         track_unref:
1700                                 // Keep track of devices that need unref
1701                                 if (unref_cur == unref_size) {
1702                                         new_unref_list = realloc(unref_list, (unref_size + UNREF_SIZE_STEP) * sizeof(void *));
1703                                         if (new_unref_list == NULL) {
1704                                                 usbi_err(ctx, "could not realloc list for unref - aborting");
1705                                                 LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1706                                         }
1707                                         unref_list = new_unref_list;
1708                                         unref_size += UNREF_SIZE_STEP;
1709                                 }
1710                                 unref_list[unref_cur++] = dev;
1711                         }
1712
1713                         // Setup device
1714                         switch (pass) {
1715                         case HUB_PASS:
1716                         case DEV_PASS:
1717                                 // If the device has already been setup, don't do it again
1718                                 if (priv->path != NULL)
1719                                         break;
1720                                 // Take care of API initialization
1721                                 priv->path = dev_interface_path;
1722                                 dev_interface_path = NULL;
1723                                 priv->apib = &usb_api_backend[api];
1724                                 priv->sub_api = sub_api;
1725                                 switch (api) {
1726                                 case USB_API_COMPOSITE:
1727                                 case USB_API_HUB:
1728                                         break;
1729                                 case USB_API_HID:
1730                                         priv->hid = calloc(1, sizeof(struct hid_device_priv));
1731                                         if (priv->hid == NULL)
1732                                                 LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1733                                         break;
1734                                 default:
1735                                         // For other devices, the first interface is the same as the device
1736                                         priv->usb_interface[0].path = _strdup(priv->path);
1737                                         if (priv->usb_interface[0].path == NULL)
1738                                                 LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1739                                         // The following is needed if we want API calls to work for both simple
1740                                         // and composite devices.
1741                                         for (j = 0; j < USB_MAXINTERFACES; j++)
1742                                                 priv->usb_interface[j].apib = &usb_api_backend[api];
1743                                         break;
1744                                 }
1745                                 break;
1746                         case HCD_PASS:
1747                                 r = enumerate_hcd_root_hub(ctx, dev_id, (uint8_t)(i + 1), dev_info_data.DevInst);
1748                                 break;
1749                         case GEN_PASS:
1750                                 // The SPDRP_ADDRESS for USB devices is the device port number on the hub
1751                                 port_nr = 0;
1752                                 if (!pSetupDiGetDeviceRegistryPropertyA(*dev_info, &dev_info_data, SPDRP_ADDRESS,
1753                                                 NULL, (PBYTE)&port_nr, sizeof(port_nr), &size) || (size != sizeof(port_nr)))
1754                                         usbi_warn(ctx, "could not retrieve port number for device '%s': %s", dev_id, windows_error_str(0));
1755                                 r = init_device(dev, parent_dev, (uint8_t)port_nr, dev_info_data.DevInst);
1756                                 if (r == LIBUSB_SUCCESS) {
1757                                         // Append device to the list of discovered devices
1758                                         discdevs = discovered_devs_append(*_discdevs, dev);
1759                                         if (!discdevs)
1760                                                 LOOP_BREAK(LIBUSB_ERROR_NO_MEM);
1761
1762                                         *_discdevs = discdevs;
1763                                 } else {
1764                                         // Failed to initialize a single device doesn't stop us from enumerating all other devices,
1765                                         // but we skip it (don't add to list of discovered devices)
1766                                         usbi_warn(ctx, "failed to initialize device '%s'", priv->dev_id);
1767                                         r = LIBUSB_SUCCESS;
1768                                 }
1769                                 break;
1770                         default: // HID_PASS and later
1771                                 if (parent_priv->apib->id == USB_API_HID || parent_priv->apib->id == USB_API_COMPOSITE) {
1772                                         if (parent_priv->apib->id == USB_API_HID) {
1773                                                 usbi_dbg("setting HID interface for [%lX]:", parent_dev->session_data);
1774                                                 r = set_hid_interface(ctx, parent_dev, dev_interface_path);
1775                                         } else {
1776                                                 usbi_dbg("setting composite interface for [%lX]:", parent_dev->session_data);
1777                                                 r = set_composite_interface(ctx, parent_dev, dev_interface_path, dev_id, api, sub_api);
1778                                         }
1779                                         switch (r) {
1780                                         case LIBUSB_SUCCESS:
1781                                                 dev_interface_path = NULL;
1782                                                 break;
1783                                         case LIBUSB_ERROR_ACCESS:
1784                                                 // interface has already been set => make sure dev_interface_path is freed then
1785                                                 r = LIBUSB_SUCCESS;
1786                                                 break;
1787                                         default:
1788                                                 LOOP_BREAK(r);
1789                                                 break;
1790                                         }
1791                                 }
1792                                 libusb_unref_device(parent_dev);
1793                                 break;
1794                         }
1795                 }
1796         }
1797
1798         pSetupDiDestroyDeviceInfoList(dev_info_intf);
1799
1800         // Free any additional GUIDs
1801         for (pass = EXT_PASS; pass < nb_guids; pass++)
1802                 free((void *)guid_list[pass]);
1803         free((void *)guid_list);
1804
1805         // Free any PnP enumerator strings
1806         for (i = 1; i < nb_usb_enumerators; i++)
1807                 free((void *)usb_enumerator[i]);
1808
1809         // Unref newly allocated devs
1810         for (i = 0; i < unref_cur; i++)
1811                 libusb_unref_device(unref_list[i]);
1812         free(unref_list);
1813
1814         return r;
1815 }
1816
1817 static int winusb_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, void *buffer, size_t len)
1818 {
1819         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
1820         PUSB_CONFIGURATION_DESCRIPTOR config_header;
1821
1822         if ((priv->config_descriptor == NULL) || (priv->config_descriptor[config_index] == NULL))
1823                 return LIBUSB_ERROR_NOT_FOUND;
1824
1825         config_header = priv->config_descriptor[config_index];
1826
1827         len = MIN(len, config_header->wTotalLength);
1828         memcpy(buffer, config_header, len);
1829         return (int)len;
1830 }
1831
1832 static int winusb_get_config_descriptor_by_value(struct libusb_device *dev, uint8_t bConfigurationValue,
1833         void **buffer)
1834 {
1835         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
1836         PUSB_CONFIGURATION_DESCRIPTOR config_header;
1837         uint8_t index;
1838
1839         if (priv->config_descriptor == NULL)
1840                 return LIBUSB_ERROR_NOT_FOUND;
1841
1842         for (index = 0; index < dev->device_descriptor.bNumConfigurations; index++) {
1843                 config_header = priv->config_descriptor[index];
1844                 if (config_header == NULL)
1845                         continue;
1846                 if (config_header->bConfigurationValue == bConfigurationValue) {
1847                         *buffer = config_header;
1848                         return (int)config_header->wTotalLength;
1849                 }
1850         }
1851
1852         return LIBUSB_ERROR_NOT_FOUND;
1853 }
1854
1855 /*
1856  * return the cached copy of the active config descriptor
1857  */
1858 static int winusb_get_active_config_descriptor(struct libusb_device *dev, void *buffer, size_t len)
1859 {
1860         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
1861         void *config_desc;
1862         int r;
1863
1864         if (priv->active_config == 0)
1865                 return LIBUSB_ERROR_NOT_FOUND;
1866
1867         r = winusb_get_config_descriptor_by_value(dev, priv->active_config, &config_desc);
1868         if (r < 0)
1869                 return r;
1870
1871         len = MIN(len, (size_t)r);
1872         memcpy(buffer, config_desc, len);
1873         return (int)len;
1874 }
1875
1876 static int winusb_open(struct libusb_device_handle *dev_handle)
1877 {
1878         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1879
1880         CHECK_SUPPORTED_API(priv->apib, open);
1881
1882         return priv->apib->open(SUB_API_NOTSET, dev_handle);
1883 }
1884
1885 static void winusb_close(struct libusb_device_handle *dev_handle)
1886 {
1887         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1888
1889         if (priv->apib->close)
1890                 priv->apib->close(SUB_API_NOTSET, dev_handle);
1891 }
1892
1893 static int winusb_get_configuration(struct libusb_device_handle *dev_handle, uint8_t *config)
1894 {
1895         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1896
1897         *config = priv->active_config;
1898         return LIBUSB_SUCCESS;
1899 }
1900
1901 /*
1902  * from http://msdn.microsoft.com/en-us/library/ms793522.aspx: "The port driver
1903  * does not currently expose a service that allows higher-level drivers to set
1904  * the configuration."
1905  */
1906 static int winusb_set_configuration(struct libusb_device_handle *dev_handle, uint8_t config)
1907 {
1908         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1909         int r = LIBUSB_SUCCESS;
1910
1911         r = libusb_control_transfer(dev_handle, LIBUSB_ENDPOINT_OUT |
1912                 LIBUSB_REQUEST_TYPE_STANDARD | LIBUSB_RECIPIENT_DEVICE,
1913                 LIBUSB_REQUEST_SET_CONFIGURATION, config,
1914                 0, NULL, 0, 1000);
1915
1916         if (r == LIBUSB_SUCCESS)
1917                 priv->active_config = config;
1918
1919         return r;
1920 }
1921
1922 static int winusb_claim_interface(struct libusb_device_handle *dev_handle, uint8_t iface)
1923 {
1924         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1925         int r;
1926
1927         CHECK_SUPPORTED_API(priv->apib, claim_interface);
1928
1929         safe_free(priv->usb_interface[iface].endpoint);
1930         priv->usb_interface[iface].nb_endpoints = 0;
1931
1932         r = priv->apib->claim_interface(SUB_API_NOTSET, dev_handle, iface);
1933
1934         if (r == LIBUSB_SUCCESS)
1935                 r = windows_assign_endpoints(dev_handle, iface, 0);
1936
1937         return r;
1938 }
1939
1940 static int winusb_set_interface_altsetting(struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting)
1941 {
1942         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1943         int r;
1944
1945         CHECK_SUPPORTED_API(priv->apib, set_interface_altsetting);
1946
1947         safe_free(priv->usb_interface[iface].endpoint);
1948         priv->usb_interface[iface].nb_endpoints = 0;
1949
1950         r = priv->apib->set_interface_altsetting(SUB_API_NOTSET, dev_handle, iface, altsetting);
1951
1952         if (r == LIBUSB_SUCCESS)
1953                 r = windows_assign_endpoints(dev_handle, iface, altsetting);
1954
1955         return r;
1956 }
1957
1958 static int winusb_release_interface(struct libusb_device_handle *dev_handle, uint8_t iface)
1959 {
1960         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1961
1962         CHECK_SUPPORTED_API(priv->apib, release_interface);
1963
1964         return priv->apib->release_interface(SUB_API_NOTSET, dev_handle, iface);
1965 }
1966
1967 static int winusb_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint)
1968 {
1969         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1970
1971         CHECK_SUPPORTED_API(priv->apib, clear_halt);
1972
1973         return priv->apib->clear_halt(SUB_API_NOTSET, dev_handle, endpoint);
1974 }
1975
1976 static int winusb_reset_device(struct libusb_device_handle *dev_handle)
1977 {
1978         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
1979
1980         CHECK_SUPPORTED_API(priv->apib, reset_device);
1981
1982         return priv->apib->reset_device(SUB_API_NOTSET, dev_handle);
1983 }
1984
1985 static void winusb_destroy_device(struct libusb_device *dev)
1986 {
1987         winusb_device_priv_release(dev);
1988 }
1989
1990 static void winusb_clear_transfer_priv(struct usbi_transfer *itransfer)
1991 {
1992         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
1993         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
1994         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
1995         int sub_api = priv->sub_api;
1996
1997         safe_free(transfer_priv->hid_buffer);
1998
1999         if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS && sub_api == SUB_API_WINUSB) {
2000                 if (transfer_priv->isoch_buffer_handle != NULL) {
2001                         if (WinUSBX[sub_api].UnregisterIsochBuffer(transfer_priv->isoch_buffer_handle)) {
2002                                 transfer_priv->isoch_buffer_handle = NULL;
2003                         } else {
2004                                 usbi_warn(TRANSFER_CTX(transfer), "failed to unregister WinUSB isoch buffer: %s", windows_error_str(0));
2005                         }
2006                 }
2007         }
2008
2009         safe_free(transfer_priv->iso_context);
2010
2011         // When auto claim is in use, attempt to release the auto-claimed interface
2012         auto_release(itransfer);
2013 }
2014
2015 static int winusb_submit_transfer(struct usbi_transfer *itransfer)
2016 {
2017         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2018         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
2019         int (*transfer_fn)(int, struct usbi_transfer *);
2020
2021         switch (transfer->type) {
2022         case LIBUSB_TRANSFER_TYPE_CONTROL:
2023                 transfer_fn = priv->apib->submit_control_transfer;
2024                 break;
2025         case LIBUSB_TRANSFER_TYPE_BULK:
2026         case LIBUSB_TRANSFER_TYPE_INTERRUPT:
2027                 if (IS_XFEROUT(transfer) && (transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET))
2028                         return LIBUSB_ERROR_NOT_SUPPORTED;
2029                 transfer_fn = priv->apib->submit_bulk_transfer;
2030                 break;
2031         case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
2032                 transfer_fn = priv->apib->submit_iso_transfer;
2033                 break;
2034         default:
2035                 // Should not get here since windows_submit_transfer() validates
2036                 // the transfer->type field
2037                 usbi_err(TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
2038                 return LIBUSB_ERROR_INVALID_PARAM;
2039         }
2040
2041         if (transfer_fn == NULL) {
2042                 usbi_warn(TRANSFER_CTX(transfer),
2043                         "unsupported transfer type %d (unrecognized device driver)",
2044                         transfer->type);
2045                 return LIBUSB_ERROR_NOT_SUPPORTED;
2046         }
2047
2048         return transfer_fn(SUB_API_NOTSET, itransfer);
2049 }
2050
2051 static int winusb_cancel_transfer(struct usbi_transfer *itransfer)
2052 {
2053         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2054         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
2055
2056         CHECK_SUPPORTED_API(priv->apib, cancel_transfer);
2057
2058         return priv->apib->cancel_transfer(SUB_API_NOTSET, itransfer);
2059 }
2060
2061 static enum libusb_transfer_status winusb_copy_transfer_data(struct usbi_transfer *itransfer, DWORD length)
2062 {
2063         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2064         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
2065
2066         if (priv->apib->copy_transfer_data == NULL) {
2067                 usbi_err(TRANSFER_CTX(transfer), "program assertion failed - no function to copy transfer data");
2068                 return LIBUSB_TRANSFER_ERROR;
2069         }
2070
2071         return priv->apib->copy_transfer_data(SUB_API_NOTSET, itransfer, length);
2072 }
2073
2074 // NB: MSVC6 does not support named initializers.
2075 const struct windows_backend winusb_backend = {
2076         winusb_init,
2077         winusb_exit,
2078         winusb_get_device_list,
2079         winusb_open,
2080         winusb_close,
2081         winusb_get_active_config_descriptor,
2082         winusb_get_config_descriptor,
2083         winusb_get_config_descriptor_by_value,
2084         winusb_get_configuration,
2085         winusb_set_configuration,
2086         winusb_claim_interface,
2087         winusb_release_interface,
2088         winusb_set_interface_altsetting,
2089         winusb_clear_halt,
2090         winusb_reset_device,
2091         winusb_destroy_device,
2092         winusb_submit_transfer,
2093         winusb_cancel_transfer,
2094         winusb_clear_transfer_priv,
2095         winusb_copy_transfer_data,
2096 };
2097
2098 /*
2099  * USB API backends
2100  */
2101
2102 static const char * const composite_driver_names[] = {"USBCCGP"};
2103 static const char * const winusbx_driver_names[] = {"libusbK", "libusb0", "WinUSB"};
2104 static const char * const hid_driver_names[] = {"HIDUSB", "MOUHID", "KBDHID"};
2105 const struct windows_usb_api_backend usb_api_backend[USB_API_MAX] = {
2106         {
2107                 USB_API_UNSUPPORTED,
2108                 "Unsupported API",
2109                 NULL,   /* driver_name_list */
2110                 0,      /* nb_driver_names */
2111                 NULL,   /* init */
2112                 NULL,   /* exit */
2113                 NULL,   /* open */
2114                 NULL,   /* close */
2115                 NULL,   /* configure_endpoints */
2116                 NULL,   /* claim_interface */
2117                 NULL,   /* set_interface_altsetting */
2118                 NULL,   /* release_interface */
2119                 NULL,   /* clear_halt */
2120                 NULL,   /* reset_device */
2121                 NULL,   /* submit_bulk_transfer */
2122                 NULL,   /* submit_iso_transfer */
2123                 NULL,   /* submit_control_transfer */
2124                 NULL,   /* cancel_transfer */
2125                 NULL,   /* copy_transfer_data */
2126         },
2127         {
2128                 USB_API_HUB,
2129                 "HUB API",
2130                 NULL,   /* driver_name_list */
2131                 0,      /* nb_driver_names */
2132                 NULL,   /* init */
2133                 NULL,   /* exit */
2134                 NULL,   /* open */
2135                 NULL,   /* close */
2136                 NULL,   /* configure_endpoints */
2137                 NULL,   /* claim_interface */
2138                 NULL,   /* set_interface_altsetting */
2139                 NULL,   /* release_interface */
2140                 NULL,   /* clear_halt */
2141                 NULL,   /* reset_device */
2142                 NULL,   /* submit_bulk_transfer */
2143                 NULL,   /* submit_iso_transfer */
2144                 NULL,   /* submit_control_transfer */
2145                 NULL,   /* cancel_transfer */
2146                 NULL,   /* copy_transfer_data */
2147         },
2148         {
2149                 USB_API_COMPOSITE,
2150                 "Composite API",
2151                 composite_driver_names,
2152                 ARRAYSIZE(composite_driver_names),
2153                 NULL,   /* init */
2154                 NULL,   /* exit */
2155                 composite_open,
2156                 composite_close,
2157                 NULL,   /* configure_endpoints */
2158                 composite_claim_interface,
2159                 composite_set_interface_altsetting,
2160                 composite_release_interface,
2161                 composite_clear_halt,
2162                 composite_reset_device,
2163                 composite_submit_bulk_transfer,
2164                 composite_submit_iso_transfer,
2165                 composite_submit_control_transfer,
2166                 composite_cancel_transfer,
2167                 composite_copy_transfer_data,
2168         },
2169         {
2170                 USB_API_WINUSBX,
2171                 "WinUSB-like APIs",
2172                 winusbx_driver_names,
2173                 ARRAYSIZE(winusbx_driver_names),
2174                 winusbx_init,
2175                 winusbx_exit,
2176                 winusbx_open,
2177                 winusbx_close,
2178                 winusbx_configure_endpoints,
2179                 winusbx_claim_interface,
2180                 winusbx_set_interface_altsetting,
2181                 winusbx_release_interface,
2182                 winusbx_clear_halt,
2183                 winusbx_reset_device,
2184                 winusbx_submit_bulk_transfer,
2185                 winusbx_submit_iso_transfer,
2186                 winusbx_submit_control_transfer,
2187                 winusbx_cancel_transfer,
2188                 winusbx_copy_transfer_data,
2189         },
2190         {
2191                 USB_API_HID,
2192                 "HID API",
2193                 hid_driver_names,
2194                 ARRAYSIZE(hid_driver_names),
2195                 hid_init,
2196                 hid_exit,
2197                 hid_open,
2198                 hid_close,
2199                 NULL,   /* configure_endpoints */
2200                 hid_claim_interface,
2201                 hid_set_interface_altsetting,
2202                 hid_release_interface,
2203                 hid_clear_halt,
2204                 hid_reset_device,
2205                 hid_submit_bulk_transfer,
2206                 NULL,   /* submit_iso_transfer */
2207                 hid_submit_control_transfer,
2208                 NULL,   /* cancel_transfer */
2209                 hid_copy_transfer_data,
2210         },
2211 };
2212
2213
2214 /*
2215  * WinUSB-like (WinUSB, libusb0/libusbK through libusbk DLL) API functions
2216  */
2217 #define WinUSB_Set(h, fn, required)                                                                             \
2218         do {                                                                                    \
2219                 WinUSBX[SUB_API_WINUSB].fn = (WinUsb_##fn##_t)GetProcAddress(h, "WinUsb_" #fn); \
2220                 if (required && (WinUSBX[SUB_API_WINUSB].fn == NULL)) {                         \
2221                         usbi_err(ctx, "GetProcAddress() failed for WinUsb_%s", #fn);            \
2222                         goto cleanup_winusb;                                                    \
2223                 }                                                                               \
2224         } while (0)
2225
2226 #define libusbK_Set(sub_api, fn, required)                                                              \
2227         do {                                                                                    \
2228                 pLibK_GetProcAddress((PVOID *)&WinUSBX[sub_api].fn, sub_api, KUSB_FNID_##fn);   \
2229                 if (required && (WinUSBX[sub_api].fn == NULL)) {                                \
2230                         usbi_err(ctx, "LibK_GetProcAddress() failed for LibK_%s", #fn);         \
2231                         goto cleanup_libusbk;                                                   \
2232                 }                                                                               \
2233         } while (0)
2234
2235 static bool winusbx_init(struct libusb_context *ctx)
2236 {
2237         HMODULE hWinUSB, hlibusbK;
2238
2239         hWinUSB = load_system_library(ctx, "WinUSB");
2240         if (hWinUSB != NULL) {
2241                 WinUSB_Set(hWinUSB, AbortPipe, true);
2242                 WinUSB_Set(hWinUSB, ControlTransfer, true);
2243                 WinUSB_Set(hWinUSB, FlushPipe, true);
2244                 WinUSB_Set(hWinUSB, Free, true);
2245                 WinUSB_Set(hWinUSB, GetAssociatedInterface, true);
2246                 WinUSB_Set(hWinUSB, Initialize, true);
2247                 WinUSB_Set(hWinUSB, ReadPipe, true);
2248                 WinUSB_Set(hWinUSB, ResetPipe, true);
2249                 WinUSB_Set(hWinUSB, SetCurrentAlternateSetting, true);
2250                 WinUSB_Set(hWinUSB, SetPipePolicy, true);
2251                 WinUSB_Set(hWinUSB, WritePipe, true);
2252
2253                 // Check for isochronous transfers support (available starting with Windows 8.1)
2254                 WinUSB_Set(hWinUSB, ReadIsochPipeAsap, false);
2255                 if (WinUSBX[SUB_API_WINUSB].ReadIsochPipeAsap != NULL) {
2256                         WinUSB_Set(hWinUSB, QueryPipeEx, true);
2257                         WinUSB_Set(hWinUSB, RegisterIsochBuffer, true);
2258                         WinUSB_Set(hWinUSB, UnregisterIsochBuffer, true);
2259                         WinUSB_Set(hWinUSB, WriteIsochPipeAsap, true);
2260                 }
2261
2262                 WinUSBX[SUB_API_WINUSB].hDll = hWinUSB;
2263
2264                 usbi_info(ctx, "WinUSB DLL available (%s isoch support)",
2265                         (WinUSBX[SUB_API_WINUSB].ReadIsochPipeAsap != NULL) ? "with" : "without");
2266
2267 cleanup_winusb:
2268                 if (WinUSBX[SUB_API_WINUSB].hDll == NULL) {
2269                         usbi_err(ctx, "failed to initialize WinUSB");
2270                         memset(&WinUSBX[SUB_API_WINUSB], 0, sizeof(WinUSBX[SUB_API_WINUSB]));
2271                         FreeLibrary(hWinUSB);
2272                         hWinUSB = NULL;
2273                 }
2274         } else {
2275                 usbi_info(ctx, "WinUSB DLL is not available");
2276         }
2277
2278         hlibusbK = load_system_library(ctx, "libusbK");
2279         if (hlibusbK != NULL) {
2280                 LibK_GetVersion_t pLibK_GetVersion;
2281                 LibK_GetProcAddress_t pLibK_GetProcAddress;
2282                 int sub_api = 0;
2283
2284                 pLibK_GetVersion = (LibK_GetVersion_t)GetProcAddress(hlibusbK, "LibK_GetVersion");
2285                 if (pLibK_GetVersion != NULL) {
2286                         KLIB_VERSION LibK_Version;
2287
2288                         pLibK_GetVersion(&LibK_Version);
2289                         usbi_dbg("libusbK DLL found, version: %d.%d.%d.%d", LibK_Version.Major, LibK_Version.Minor,
2290                                 LibK_Version.Micro, LibK_Version.Nano);
2291                 } else {
2292                         usbi_dbg("libusbK DLL found, version unknown");
2293                 }
2294
2295                 pLibK_GetProcAddress = (LibK_GetProcAddress_t)GetProcAddress(hlibusbK, "LibK_GetProcAddress");
2296                 if (pLibK_GetProcAddress == NULL) {
2297                         usbi_err(ctx, "LibK_GetProcAddress() not found in libusbK DLL");
2298                         goto cleanup_libusbk;
2299                 }
2300
2301                 // NB: The below for loop works because the sub_api value for WinUSB
2302                 // is a higher value than that of libusbK and libusb0
2303                 for (; sub_api < SUB_API_WINUSB; sub_api++) {
2304                         libusbK_Set(sub_api, AbortPipe, true);
2305                         libusbK_Set(sub_api, ControlTransfer, true);
2306                         libusbK_Set(sub_api, FlushPipe, true);
2307                         libusbK_Set(sub_api, Free, true);
2308                         libusbK_Set(sub_api, GetAssociatedInterface, true);
2309                         libusbK_Set(sub_api, Initialize, true);
2310                         libusbK_Set(sub_api, ReadPipe, true);
2311                         libusbK_Set(sub_api, ResetPipe, true);
2312                         libusbK_Set(sub_api, SetCurrentAlternateSetting, true);
2313                         libusbK_Set(sub_api, SetPipePolicy, true);
2314                         libusbK_Set(sub_api, WritePipe, true);
2315
2316                         // Optional isochronous support
2317                         libusbK_Set(sub_api, IsoReadPipe, false);
2318                         if (WinUSBX[sub_api].IsoReadPipe != NULL)
2319                                 libusbK_Set(sub_api, IsoWritePipe, true);
2320
2321                         // Optional device reset support
2322                         libusbK_Set(sub_api, ResetDevice, false);
2323
2324                         WinUSBX[sub_api].hDll = hlibusbK;
2325                 }
2326
2327 cleanup_libusbk:
2328                 if (sub_api < SUB_API_WINUSB) {
2329                         usbi_err(ctx, "failed to initialize libusbK");
2330                         while (sub_api >= 0) {
2331                                 memset(&WinUSBX[sub_api], 0, sizeof(WinUSBX[sub_api]));
2332                                 sub_api--;
2333                         }
2334                         FreeLibrary(hlibusbK);
2335                         hlibusbK = NULL;
2336                 }
2337         } else {
2338                 usbi_info(ctx, "libusbK DLL is not available");
2339         }
2340
2341         if ((hWinUSB == NULL) && (hlibusbK == NULL)) {
2342                 usbi_warn(ctx, "neither WinUSB nor libusbK DLLs were found, "
2343                         "you will not be able to access devices outside of enumeration");
2344                 return false;
2345         }
2346
2347         return true;
2348 }
2349
2350 static void winusbx_exit(void)
2351 {
2352         bool loaded = false;
2353         HMODULE hDll;
2354
2355         hDll = WinUSBX[SUB_API_LIBUSBK].hDll;
2356         if (hDll != NULL) {
2357                 FreeLibrary(hDll);
2358                 loaded = true;
2359         }
2360
2361         hDll = WinUSBX[SUB_API_WINUSB].hDll;
2362         if (hDll != NULL) {
2363                 FreeLibrary(hDll);
2364                 loaded = true;
2365         }
2366
2367         // Reset the WinUSBX API structures if something was loaded
2368         if (loaded)
2369                 memset(&WinUSBX, 0, sizeof(WinUSBX));
2370 }
2371
2372 // NB: open and close must ensure that they only handle interface of
2373 // the right API type, as these functions can be called wholesale from
2374 // composite_open(), with interfaces belonging to different APIs
2375 static int winusbx_open(int sub_api, struct libusb_device_handle *dev_handle)
2376 {
2377         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
2378         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
2379         HANDLE file_handle;
2380         int i;
2381
2382         CHECK_WINUSBX_AVAILABLE(sub_api);
2383
2384         // WinUSB requires a separate handle for each interface
2385         for (i = 0; i < USB_MAXINTERFACES; i++) {
2386                 if ((priv->usb_interface[i].path != NULL)
2387                                 && (priv->usb_interface[i].apib->id == USB_API_WINUSBX)) {
2388                         file_handle = windows_open(dev_handle, priv->usb_interface[i].path, GENERIC_READ | GENERIC_WRITE);
2389                         if (file_handle == INVALID_HANDLE_VALUE) {
2390                                 usbi_err(HANDLE_CTX(dev_handle), "could not open device %s (interface %d): %s", priv->usb_interface[i].path, i, windows_error_str(0));
2391                                 switch (GetLastError()) {
2392                                 case ERROR_FILE_NOT_FOUND: // The device was disconnected
2393                                         return LIBUSB_ERROR_NO_DEVICE;
2394                                 case ERROR_ACCESS_DENIED:
2395                                         return LIBUSB_ERROR_ACCESS;
2396                                 default:
2397                                         return LIBUSB_ERROR_IO;
2398                                 }
2399                         }
2400
2401                         handle_priv->interface_handle[i].dev_handle = file_handle;
2402                 }
2403         }
2404
2405         return LIBUSB_SUCCESS;
2406 }
2407
2408 static void winusbx_close(int sub_api, struct libusb_device_handle *dev_handle)
2409 {
2410         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
2411         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
2412         HANDLE handle;
2413         int i;
2414
2415         if (sub_api == SUB_API_NOTSET)
2416                 sub_api = priv->sub_api;
2417
2418         if (WinUSBX[sub_api].hDll == NULL)
2419                 return;
2420
2421         if (priv->apib->id == USB_API_COMPOSITE) {
2422                 // If this is a composite device, just free and close all WinUSB-like
2423                 // interfaces directly (each is independent and not associated with another)
2424                 for (i = 0; i < USB_MAXINTERFACES; i++) {
2425                         if (priv->usb_interface[i].apib->id == USB_API_WINUSBX) {
2426                                 handle = handle_priv->interface_handle[i].api_handle;
2427                                 if (HANDLE_VALID(handle))
2428                                         WinUSBX[sub_api].Free(handle);
2429
2430                                 handle = handle_priv->interface_handle[i].dev_handle;
2431                                 if (HANDLE_VALID(handle))
2432                                         CloseHandle(handle);
2433                         }
2434                 }
2435         } else {
2436                 // If this is a WinUSB device, free all interfaces above interface 0,
2437                 // then free and close interface 0 last
2438                 for (i = 1; i < USB_MAXINTERFACES; i++) {
2439                         handle = handle_priv->interface_handle[i].api_handle;
2440                         if (HANDLE_VALID(handle))
2441                                 WinUSBX[sub_api].Free(handle);
2442                 }
2443                 handle = handle_priv->interface_handle[0].api_handle;
2444                 if (HANDLE_VALID(handle))
2445                         WinUSBX[sub_api].Free(handle);
2446
2447                 handle = handle_priv->interface_handle[0].dev_handle;
2448                 if (HANDLE_VALID(handle))
2449                         CloseHandle(handle);
2450         }
2451 }
2452
2453 static int winusbx_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface)
2454 {
2455         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
2456         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
2457         HANDLE winusb_handle = handle_priv->interface_handle[iface].api_handle;
2458         UCHAR policy;
2459         ULONG timeout = 0;
2460         uint8_t endpoint_address;
2461         int i;
2462
2463         CHECK_WINUSBX_AVAILABLE(sub_api);
2464
2465         // With handle and endpoints set (in parent), we can setup the default pipe properties
2466         // see http://download.microsoft.com/download/D/1/D/D1DD7745-426B-4CC3-A269-ABBBE427C0EF/DVC-T705_DDC08.pptx
2467         for (i = -1; i < priv->usb_interface[iface].nb_endpoints; i++) {
2468                 endpoint_address = (i == -1) ? 0 : priv->usb_interface[iface].endpoint[i];
2469                 if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
2470                         PIPE_TRANSFER_TIMEOUT, sizeof(ULONG), &timeout))
2471                         usbi_dbg("failed to set PIPE_TRANSFER_TIMEOUT for control endpoint %02X", endpoint_address);
2472
2473                 if ((i == -1) || (sub_api == SUB_API_LIBUSB0))
2474                         continue; // Other policies don't apply to control endpoint or libusb0
2475
2476                 policy = false;
2477                 if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
2478                         SHORT_PACKET_TERMINATE, sizeof(UCHAR), &policy))
2479                         usbi_dbg("failed to disable SHORT_PACKET_TERMINATE for endpoint %02X", endpoint_address);
2480
2481                 if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
2482                         IGNORE_SHORT_PACKETS, sizeof(UCHAR), &policy))
2483                         usbi_dbg("failed to disable IGNORE_SHORT_PACKETS for endpoint %02X", endpoint_address);
2484
2485                 policy = true;
2486                 /* ALLOW_PARTIAL_READS must be enabled due to likely libusbK bug. See:
2487                    https://sourceforge.net/mailarchive/message.php?msg_id=29736015 */
2488                 if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
2489                         ALLOW_PARTIAL_READS, sizeof(UCHAR), &policy))
2490                         usbi_dbg("failed to enable ALLOW_PARTIAL_READS for endpoint %02X", endpoint_address);
2491
2492                 if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
2493                         AUTO_CLEAR_STALL, sizeof(UCHAR), &policy))
2494                         usbi_dbg("failed to enable AUTO_CLEAR_STALL for endpoint %02X", endpoint_address);
2495
2496                 if (sub_api == SUB_API_LIBUSBK) {
2497                         if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address,
2498                                 ISO_ALWAYS_START_ASAP, sizeof(UCHAR), &policy))
2499                                 usbi_dbg("failed to enable ISO_ALWAYS_START_ASAP for endpoint %02X", endpoint_address);
2500                 }
2501         }
2502
2503         return LIBUSB_SUCCESS;
2504 }
2505
2506 static int winusbx_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface)
2507 {
2508         struct libusb_context *ctx = HANDLE_CTX(dev_handle);
2509         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
2510         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
2511         bool is_using_usbccgp = (priv->apib->id == USB_API_COMPOSITE);
2512         HDEVINFO dev_info;
2513         char *dev_interface_path = NULL;
2514         char *dev_interface_path_guid_start;
2515         char filter_path[] = "\\\\.\\libusb0-0000";
2516         bool found_filter = false;
2517         HANDLE file_handle, winusb_handle;
2518         DWORD err, _index;
2519         int r;
2520
2521         CHECK_WINUSBX_AVAILABLE(sub_api);
2522
2523         // If the device is composite, but using the default Windows composite parent driver (usbccgp)
2524         // or if it's the first WinUSB-like interface, we get a handle through Initialize().
2525         if ((is_using_usbccgp) || (iface == 0)) {
2526                 // composite device (independent interfaces) or interface 0
2527                 file_handle = handle_priv->interface_handle[iface].dev_handle;
2528                 if (!HANDLE_VALID(file_handle))
2529                         return LIBUSB_ERROR_NOT_FOUND;
2530
2531                 if (!WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) {
2532                         handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE;
2533                         err = GetLastError();
2534                         switch (err) {
2535                         case ERROR_BAD_COMMAND:
2536                                 // The device was disconnected
2537                                 usbi_err(ctx, "could not access interface %u: %s", iface, windows_error_str(0));
2538                                 return LIBUSB_ERROR_NO_DEVICE;
2539                         default:
2540                                 // it may be that we're using the libusb0 filter driver.
2541                                 // TODO: can we move this whole business into the K/0 DLL?
2542                                 r = LIBUSB_SUCCESS;
2543                                 for (_index = 0; ; _index++) {
2544                                         safe_free(dev_interface_path);
2545
2546                                         if (found_filter)
2547                                                 break;
2548
2549                                         r = get_interface_details_filter(ctx, &dev_info, _index, filter_path, &dev_interface_path);
2550                                         if ((r != LIBUSB_SUCCESS) || (dev_interface_path == NULL))
2551                                                 break;
2552
2553                                         // ignore GUID part
2554                                         dev_interface_path_guid_start = strchr(dev_interface_path, '{');
2555                                         if (dev_interface_path_guid_start == NULL)
2556                                                 continue;
2557                                         *dev_interface_path_guid_start = '\0';
2558
2559                                         if (strncmp(dev_interface_path, priv->usb_interface[iface].path, strlen(dev_interface_path)) == 0) {
2560                                                 file_handle = windows_open(dev_handle, filter_path, GENERIC_READ | GENERIC_WRITE);
2561                                                 if (file_handle != INVALID_HANDLE_VALUE) {
2562                                                         if (WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) {
2563                                                                 // Replace the existing file handle with the working one
2564                                                                 CloseHandle(handle_priv->interface_handle[iface].dev_handle);
2565                                                                 handle_priv->interface_handle[iface].dev_handle = file_handle;
2566                                                                 found_filter = true;
2567                                                         } else {
2568                                                                 usbi_err(ctx, "could not initialize filter driver for %s", filter_path);
2569                                                                 CloseHandle(file_handle);
2570                                                         }
2571                                                 } else {
2572                                                         usbi_err(ctx, "could not open device %s: %s", filter_path, windows_error_str(0));
2573                                                 }
2574                                         }
2575                                 }
2576                                 if (r != LIBUSB_SUCCESS)
2577                                         return r;
2578                                 if (!found_filter) {
2579                                         usbi_err(ctx, "could not access interface %u: %s", iface, windows_error_str(err));
2580                                         return LIBUSB_ERROR_ACCESS;
2581                                 }
2582                         }
2583                 }
2584                 handle_priv->interface_handle[iface].api_handle = winusb_handle;
2585         } else {
2586                 // For all other interfaces, use GetAssociatedInterface()
2587                 winusb_handle = handle_priv->interface_handle[0].api_handle;
2588                 // It is a requirement for multiple interface devices on Windows that, to you
2589                 // must first claim the first interface before you claim the others
2590                 if (!HANDLE_VALID(winusb_handle)) {
2591                         file_handle = handle_priv->interface_handle[0].dev_handle;
2592                         if (WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) {
2593                                 handle_priv->interface_handle[0].api_handle = winusb_handle;
2594                                 usbi_warn(ctx, "auto-claimed interface 0 (required to claim %u with WinUSB)", iface);
2595                         } else {
2596                                 usbi_warn(ctx, "failed to auto-claim interface 0 (required to claim %u with WinUSB): %s", iface, windows_error_str(0));
2597                                 return LIBUSB_ERROR_ACCESS;
2598                         }
2599                 }
2600                 if (!WinUSBX[sub_api].GetAssociatedInterface(winusb_handle, (UCHAR)(iface - 1),
2601                         &handle_priv->interface_handle[iface].api_handle)) {
2602                         handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE;
2603                         switch (GetLastError()) {
2604                         case ERROR_NO_MORE_ITEMS:   // invalid iface
2605                                 return LIBUSB_ERROR_NOT_FOUND;
2606                         case ERROR_BAD_COMMAND:     // The device was disconnected
2607                                 return LIBUSB_ERROR_NO_DEVICE;
2608                         case ERROR_ALREADY_EXISTS:  // already claimed
2609                                 return LIBUSB_ERROR_BUSY;
2610                         default:
2611                                 usbi_err(ctx, "could not claim interface %u: %s", iface, windows_error_str(0));
2612                                 return LIBUSB_ERROR_ACCESS;
2613                         }
2614                 }
2615                 handle_priv->interface_handle[iface].dev_handle = handle_priv->interface_handle[0].dev_handle;
2616         }
2617         usbi_dbg("claimed interface %u", iface);
2618         handle_priv->active_interface = iface;
2619
2620         return LIBUSB_SUCCESS;
2621 }
2622
2623 static int winusbx_release_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface)
2624 {
2625         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
2626         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
2627         HANDLE winusb_handle;
2628
2629         CHECK_WINUSBX_AVAILABLE(sub_api);
2630
2631         winusb_handle = handle_priv->interface_handle[iface].api_handle;
2632         if (!HANDLE_VALID(winusb_handle))
2633                 return LIBUSB_ERROR_NOT_FOUND;
2634
2635         WinUSBX[sub_api].Free(winusb_handle);
2636         handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE;
2637
2638         return LIBUSB_SUCCESS;
2639 }
2640
2641 /*
2642  * Return the first valid interface (of the same API type), for control transfers
2643  */
2644 static int get_valid_interface(struct libusb_device_handle *dev_handle, int api_id)
2645 {
2646         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
2647         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
2648         int i;
2649
2650         if ((api_id < USB_API_WINUSBX) || (api_id > USB_API_HID)) {
2651                 usbi_dbg("unsupported API ID");
2652                 return -1;
2653         }
2654
2655         for (i = 0; i < USB_MAXINTERFACES; i++) {
2656         if (HANDLE_VALID(handle_priv->interface_handle[i].dev_handle)
2657                         && HANDLE_VALID(handle_priv->interface_handle[i].api_handle)
2658                         && (priv->usb_interface[i].apib->id == api_id))
2659                 return i;
2660         }
2661
2662         return -1;
2663 }
2664
2665 /*
2666 * Check a specific interface is valid (of the same API type), for control transfers
2667 */
2668 static int check_valid_interface(struct libusb_device_handle *dev_handle, unsigned short interface, int api_id)
2669 {
2670         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
2671         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
2672
2673         if (interface >= USB_MAXINTERFACES)
2674                 return -1;
2675
2676         if ((api_id < USB_API_WINUSBX) || (api_id > USB_API_HID)) {
2677                 usbi_dbg("unsupported API ID");
2678                 return -1;
2679         }
2680
2681         // try the requested interface
2682         if (HANDLE_VALID(handle_priv->interface_handle[interface].dev_handle)
2683                 && HANDLE_VALID(handle_priv->interface_handle[interface].api_handle)
2684                 && (priv->usb_interface[interface].apib->id == api_id))
2685                 return interface;
2686
2687         return -1;
2688 }
2689
2690 /*
2691  * Lookup interface by endpoint address. -1 if not found
2692  */
2693 static int interface_by_endpoint(struct winusb_device_priv *priv,
2694         struct winusb_device_handle_priv *handle_priv, uint8_t endpoint_address)
2695 {
2696         int i, j;
2697
2698         for (i = 0; i < USB_MAXINTERFACES; i++) {
2699                 if (!HANDLE_VALID(handle_priv->interface_handle[i].api_handle))
2700                         continue;
2701                 if (priv->usb_interface[i].endpoint == NULL)
2702                         continue;
2703                 for (j = 0; j < priv->usb_interface[i].nb_endpoints; j++) {
2704                         if (priv->usb_interface[i].endpoint[j] == endpoint_address)
2705                                 return i;
2706                 }
2707         }
2708
2709         return -1;
2710 }
2711
2712 static int winusbx_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer)
2713 {
2714         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2715         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
2716         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
2717         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(transfer->dev_handle);
2718         PWINUSB_SETUP_PACKET setup = (PWINUSB_SETUP_PACKET)transfer->buffer;
2719         ULONG size;
2720         HANDLE winusb_handle;
2721         OVERLAPPED *overlapped;
2722         int current_interface;
2723
2724         CHECK_WINUSBX_AVAILABLE(sub_api);
2725
2726         size = transfer->length - LIBUSB_CONTROL_SETUP_SIZE;
2727
2728         // Windows places upper limits on the control transfer size
2729         // See: https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/usb-bandwidth-allocation#maximum-transfer-size
2730         if (size > MAX_CTRL_BUFFER_LENGTH)
2731                 return LIBUSB_ERROR_INVALID_PARAM;
2732
2733         if ((setup->RequestType & 0x1F) == LIBUSB_RECIPIENT_INTERFACE)
2734                 current_interface = check_valid_interface(transfer->dev_handle, setup->Index & 0xff, USB_API_WINUSBX);
2735         else
2736                 current_interface = get_valid_interface(transfer->dev_handle, USB_API_WINUSBX);
2737         if (current_interface < 0) {
2738                 if (auto_claim(transfer, &current_interface, USB_API_WINUSBX) != LIBUSB_SUCCESS)
2739                         return LIBUSB_ERROR_NOT_FOUND;
2740         }
2741
2742         usbi_dbg("will use interface %d", current_interface);
2743
2744         winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
2745         set_transfer_priv_handle(itransfer, handle_priv->interface_handle[current_interface].dev_handle);
2746         overlapped = get_transfer_priv_overlapped(itransfer);
2747
2748         // Sending of set configuration control requests from WinUSB creates issues, except when using libusb0.sys
2749         if (sub_api != SUB_API_LIBUSB0
2750                         && (LIBUSB_REQ_TYPE(setup->RequestType) == LIBUSB_REQUEST_TYPE_STANDARD)
2751                         && (setup->Request == LIBUSB_REQUEST_SET_CONFIGURATION)) {
2752                 if (setup->Value != priv->active_config) {
2753                         usbi_warn(TRANSFER_CTX(transfer), "cannot set configuration other than the default one");
2754                         return LIBUSB_ERROR_NOT_SUPPORTED;
2755                 }
2756                 windows_force_sync_completion(itransfer, 0);
2757         } else {
2758                 if (!WinUSBX[sub_api].ControlTransfer(winusb_handle, *setup, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, size, NULL, overlapped)) {
2759                         if (GetLastError() != ERROR_IO_PENDING) {
2760                                 usbi_warn(TRANSFER_CTX(transfer), "ControlTransfer failed: %s", windows_error_str(0));
2761                                 return LIBUSB_ERROR_IO;
2762                         }
2763                 }
2764         }
2765
2766         transfer_priv->interface_number = (uint8_t)current_interface;
2767
2768         return LIBUSB_SUCCESS;
2769 }
2770
2771 static int winusbx_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting)
2772 {
2773         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
2774         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
2775         HANDLE winusb_handle;
2776
2777         CHECK_WINUSBX_AVAILABLE(sub_api);
2778
2779         winusb_handle = handle_priv->interface_handle[iface].api_handle;
2780         if (!HANDLE_VALID(winusb_handle)) {
2781                 usbi_err(HANDLE_CTX(dev_handle), "interface must be claimed first");
2782                 return LIBUSB_ERROR_NOT_FOUND;
2783         }
2784
2785         if (!WinUSBX[sub_api].SetCurrentAlternateSetting(winusb_handle, altsetting)) {
2786                 usbi_err(HANDLE_CTX(dev_handle), "SetCurrentAlternateSetting failed: %s", windows_error_str(0));
2787                 return LIBUSB_ERROR_IO;
2788         }
2789
2790         return LIBUSB_SUCCESS;
2791 }
2792
2793
2794 static void WINAPI winusbx_native_iso_transfer_continue_stream_callback(struct libusb_transfer *transfer)
2795 {
2796         // If this callback is invoked, this means that we attempted to set ContinueStream
2797         // to TRUE when calling Read/WriteIsochPipeAsap in winusbx_do_iso_transfer.
2798         // The role of this callback is to fallback to ContinueStream = FALSE if the transfer
2799         // did not succeed.
2800
2801         struct winusb_transfer_priv *transfer_priv =
2802                 get_winusb_transfer_priv(LIBUSB_TRANSFER_TO_USBI_TRANSFER(transfer));
2803         bool fallback = (transfer->status != LIBUSB_TRANSFER_COMPLETED);
2804         int idx;
2805
2806         // Restore the user callback
2807         transfer->callback = transfer_priv->iso_user_callback;
2808
2809         for (idx = 0; idx < transfer->num_iso_packets && !fallback; idx++) {
2810                 if (transfer->iso_packet_desc[idx].status != LIBUSB_TRANSFER_COMPLETED)
2811                         fallback = true;
2812         }
2813
2814         if (!fallback) {
2815                 // If the transfer was successful, we restore the user callback and call it.
2816                 if (transfer->callback)
2817                         transfer->callback(transfer);
2818         } else {
2819                 // If the transfer wasn't successful we reschedule the transfer while forcing it
2820                 // not to continue the stream. This might results in a 5-ms delay.
2821                 transfer_priv->iso_break_stream = TRUE;
2822                 libusb_submit_transfer(transfer);
2823         }
2824 }
2825 static int winusbx_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer)
2826 {
2827         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
2828         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
2829         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(transfer->dev_handle);
2830         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
2831         HANDLE winusb_handle;
2832         OVERLAPPED *overlapped;
2833         BOOL ret;
2834         int current_interface;
2835
2836         CHECK_WINUSBX_AVAILABLE(sub_api);
2837
2838         current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
2839         if (current_interface < 0) {
2840                 usbi_err(TRANSFER_CTX(transfer), "unable to match endpoint to an open interface - cancelling transfer");
2841                 return LIBUSB_ERROR_NOT_FOUND;
2842         }
2843
2844         usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface);
2845
2846         winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
2847         set_transfer_priv_handle(itransfer, handle_priv->interface_handle[current_interface].dev_handle);
2848         overlapped = get_transfer_priv_overlapped(itransfer);
2849
2850         if ((sub_api == SUB_API_LIBUSBK) || (sub_api == SUB_API_LIBUSB0)) {
2851                 int i;
2852                 UINT offset;
2853                 size_t iso_ctx_size;
2854                 PKISO_CONTEXT iso_context;
2855
2856                 if (WinUSBX[sub_api].IsoReadPipe == NULL) {
2857                         usbi_warn(TRANSFER_CTX(transfer), "libusbK DLL does not support isoch transfers");
2858                         return LIBUSB_ERROR_NOT_SUPPORTED;
2859                 }
2860
2861                 iso_ctx_size = sizeof(KISO_CONTEXT) + (transfer->num_iso_packets * sizeof(KISO_PACKET));
2862                 transfer_priv->iso_context = iso_context = calloc(1, iso_ctx_size);
2863                 if (transfer_priv->iso_context == NULL)
2864                         return LIBUSB_ERROR_NO_MEM;
2865
2866                 // start ASAP
2867                 iso_context->StartFrame = 0;
2868                 iso_context->NumberOfPackets = (SHORT)transfer->num_iso_packets;
2869
2870                 // convert the transfer packet lengths to iso_packet offsets
2871                 offset = 0;
2872                 for (i = 0; i < transfer->num_iso_packets; i++) {
2873                         iso_context->IsoPackets[i].offset = offset;
2874                         offset += transfer->iso_packet_desc[i].length;
2875                 }
2876
2877                 if (IS_XFERIN(transfer)) {
2878                         usbi_dbg("reading %d iso packets", transfer->num_iso_packets);
2879                         ret = WinUSBX[sub_api].IsoReadPipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, overlapped, iso_context);
2880                 } else {
2881                         usbi_dbg("writing %d iso packets", transfer->num_iso_packets);
2882                         ret = WinUSBX[sub_api].IsoWritePipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, overlapped, iso_context);
2883                 }
2884
2885                 if (!ret && GetLastError() != ERROR_IO_PENDING) {
2886                         usbi_err(TRANSFER_CTX(transfer), "IsoReadPipe/IsoWritePipe failed: %s", windows_error_str(0));
2887                         return LIBUSB_ERROR_IO;
2888                 }
2889
2890                 transfer_priv->interface_number = (uint8_t)current_interface;
2891
2892                 return LIBUSB_SUCCESS;
2893         } else if (sub_api == SUB_API_WINUSB) {
2894                 WINUSB_PIPE_INFORMATION_EX pipe_info_ex = { 0 };
2895                 WINUSB_ISOCH_BUFFER_HANDLE buffer_handle;
2896                 ULONG iso_transfer_size_multiple;
2897                 int out_transfer_length = 0;
2898                 int idx;
2899
2900                 // Depending on the version of Microsoft WinUSB, isochronous transfers may not be supported.
2901                 if (WinUSBX[sub_api].ReadIsochPipeAsap == NULL) {
2902                         usbi_warn(TRANSFER_CTX(transfer), "WinUSB DLL does not support isoch transfers");
2903                         return LIBUSB_ERROR_NOT_SUPPORTED;
2904                 }
2905
2906                 if (sizeof(struct libusb_iso_packet_descriptor) != sizeof(USBD_ISO_PACKET_DESCRIPTOR)) {
2907                         usbi_err(TRANSFER_CTX(transfer), "size of WinUsb and libusb isoch packet descriptors don't match");
2908                         return LIBUSB_ERROR_NOT_SUPPORTED;
2909                 }
2910
2911                 // Query the pipe extended information to find the pipe index corresponding to the endpoint.
2912                 for (idx = 0; idx < priv->usb_interface[current_interface].nb_endpoints; ++idx) {
2913                         ret = WinUSBX[sub_api].QueryPipeEx(winusb_handle, (UINT8)priv->usb_interface[current_interface].current_altsetting, (UCHAR)idx, &pipe_info_ex);
2914                         if (!ret) {
2915                                 usbi_err(TRANSFER_CTX(transfer), "couldn't query interface settings for USB pipe with index %d. Error: %s", idx, windows_error_str(0));
2916                                 return LIBUSB_ERROR_NOT_FOUND;
2917                         }
2918
2919                         if (pipe_info_ex.PipeId == transfer->endpoint && pipe_info_ex.PipeType == UsbdPipeTypeIsochronous)
2920                                 break;
2921                 }
2922
2923                 // Make sure we found the index.
2924                 if (idx == priv->usb_interface[current_interface].nb_endpoints) {
2925                         usbi_err(TRANSFER_CTX(transfer), "couldn't find isoch endpoint 0x%02x", transfer->endpoint);
2926                         return LIBUSB_ERROR_NOT_FOUND;
2927                 }
2928
2929                 if (IS_XFERIN(transfer)) {
2930                         int interval = pipe_info_ex.Interval;
2931
2932                         // For high-speed and SuperSpeed device, the interval is 2**(bInterval-1).
2933                         if (transfer->dev_handle->dev->speed >= LIBUSB_SPEED_HIGH)
2934                                 interval = (1 << (pipe_info_ex.Interval - 1));
2935
2936                         // WinUSB only supports isoch transfers spanning a full USB frames. Later, we might be smarter about this
2937                         // and allocate a temporary buffer. However, this is harder than it seems as its destruction would depend on overlapped
2938                         // IO...
2939                         iso_transfer_size_multiple = (pipe_info_ex.MaximumBytesPerInterval * 8) / interval;
2940                         if (transfer->length % iso_transfer_size_multiple != 0) {
2941                                 usbi_err(TRANSFER_CTX(transfer), "length of isoch buffer must be a multiple of the MaximumBytesPerInterval * 8 / Interval");
2942                                 return LIBUSB_ERROR_INVALID_PARAM;
2943                         }
2944                 } else {
2945                         // If this is an OUT transfer, we make sure the isoch packets are contiguous as this isn't supported otherwise.
2946                         bool size_should_be_zero = false;
2947
2948                         for (idx = 0; idx < transfer->num_iso_packets; ++idx) {
2949                                 if ((size_should_be_zero && transfer->iso_packet_desc[idx].length != 0) ||
2950                                         (transfer->iso_packet_desc[idx].length != pipe_info_ex.MaximumBytesPerInterval && idx + 1 < transfer->num_iso_packets && transfer->iso_packet_desc[idx + 1].length > 0)) {
2951                                         usbi_err(TRANSFER_CTX(transfer), "isoch packets for OUT transfer with WinUSB must be contiguous in memory");
2952                                         return LIBUSB_ERROR_INVALID_PARAM;
2953                                 }
2954
2955                                 size_should_be_zero = (transfer->iso_packet_desc[idx].length == 0);
2956                                 out_transfer_length += transfer->iso_packet_desc[idx].length;
2957                         }
2958                 }
2959
2960                 if (transfer_priv->isoch_buffer_handle != NULL) {
2961                         if (WinUSBX[sub_api].UnregisterIsochBuffer(transfer_priv->isoch_buffer_handle)) {
2962                                 transfer_priv->isoch_buffer_handle = NULL;
2963                         } else {
2964                                 usbi_err(TRANSFER_CTX(transfer), "failed to unregister WinUSB isoch buffer: %s", windows_error_str(0));
2965                                 return LIBUSB_ERROR_OTHER;
2966                         }
2967                 }
2968
2969                 // Register the isoch buffer to the operating system.
2970                 ret = WinUSBX[sub_api].RegisterIsochBuffer(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, &buffer_handle);
2971                 if (!ret) {
2972                         usbi_err(TRANSFER_CTX(transfer), "failed to register WinUSB isoch buffer: %s", windows_error_str(0));
2973                         return LIBUSB_ERROR_NO_MEM;
2974                 }
2975
2976                 // Important note: the WinUSB_Read/WriteIsochPipeAsap API requires a ContinueStream parameter that tells whether the isochronous
2977                 // stream must be continued or if the WinUSB driver can schedule the transfer at its convenience. Profiling subsequent transfers
2978                 // with ContinueStream = FALSE showed that 5 frames, i.e. about 5 milliseconds, were left empty between each transfer. This
2979                 // is critical as this greatly diminish the achievable isochronous bandwidth. We solved the problem using the following strategy:
2980                 // - Transfers are first scheduled with ContinueStream = TRUE and with winusbx_iso_transfer_continue_stream_callback as user callback.
2981                 // - If the transfer succeeds, winusbx_iso_transfer_continue_stream_callback restore the user callback and calls its.
2982                 // - If the transfer fails, winusbx_iso_transfer_continue_stream_callback reschedule the transfer and force ContinueStream = FALSE.
2983                 if (!transfer_priv->iso_break_stream) {
2984                         transfer_priv->iso_user_callback = transfer->callback;
2985                         transfer->callback = winusbx_native_iso_transfer_continue_stream_callback;
2986                 }
2987
2988                 // Initiate the transfers.
2989                 if (IS_XFERIN(transfer))
2990                         ret = WinUSBX[sub_api].ReadIsochPipeAsap(buffer_handle, 0, transfer->length, !transfer_priv->iso_break_stream, transfer->num_iso_packets, (PUSBD_ISO_PACKET_DESCRIPTOR)transfer->iso_packet_desc, overlapped);
2991                 else
2992                         ret = WinUSBX[sub_api].WriteIsochPipeAsap(buffer_handle, 0, out_transfer_length, !transfer_priv->iso_break_stream, overlapped);
2993
2994                 if (!ret && GetLastError() != ERROR_IO_PENDING) {
2995                         usbi_err(TRANSFER_CTX(transfer), "ReadIsochPipeAsap/WriteIsochPipeAsap failed: %s", windows_error_str(0));
2996                         if (!WinUSBX[sub_api].UnregisterIsochBuffer(buffer_handle))
2997                                 usbi_warn(TRANSFER_CTX(transfer), "failed to unregister WinUSB isoch buffer: %s", windows_error_str(0));
2998                         return LIBUSB_ERROR_IO;
2999                 }
3000
3001                 // Restore the ContinueStream parameter to TRUE.
3002                 transfer_priv->iso_break_stream = FALSE;
3003
3004                 transfer_priv->isoch_buffer_handle = buffer_handle;
3005
3006                 transfer_priv->interface_number = (uint8_t)current_interface;
3007
3008                 return LIBUSB_SUCCESS;
3009         } else {
3010                 PRINT_UNSUPPORTED_API(winusbx_submit_iso_transfer);
3011                 return LIBUSB_ERROR_NOT_SUPPORTED;
3012         }
3013 }
3014
3015 static int winusbx_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer)
3016 {
3017         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
3018         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
3019         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(transfer->dev_handle);
3020         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
3021         HANDLE winusb_handle;
3022         OVERLAPPED *overlapped;
3023         BOOL ret;
3024         int current_interface;
3025
3026         CHECK_WINUSBX_AVAILABLE(sub_api);
3027
3028         current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
3029         if (current_interface < 0) {
3030                 usbi_err(TRANSFER_CTX(transfer), "unable to match endpoint to an open interface - cancelling transfer");
3031                 return LIBUSB_ERROR_NOT_FOUND;
3032         }
3033
3034         usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface);
3035
3036         winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
3037         set_transfer_priv_handle(itransfer, handle_priv->interface_handle[current_interface].dev_handle);
3038         overlapped = get_transfer_priv_overlapped(itransfer);
3039
3040         if (IS_XFERIN(transfer)) {
3041                 usbi_dbg("reading %d bytes", transfer->length);
3042                 ret = WinUSBX[sub_api].ReadPipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, NULL, overlapped);
3043         } else {
3044                 usbi_dbg("writing %d bytes", transfer->length);
3045                 ret = WinUSBX[sub_api].WritePipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, NULL, overlapped);
3046         }
3047
3048         if (!ret && GetLastError() != ERROR_IO_PENDING) {
3049                 usbi_err(TRANSFER_CTX(transfer), "ReadPipe/WritePipe failed: %s", windows_error_str(0));
3050                 return LIBUSB_ERROR_IO;
3051         }
3052
3053         transfer_priv->interface_number = (uint8_t)current_interface;
3054
3055         return LIBUSB_SUCCESS;
3056 }
3057
3058 static int winusbx_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint)
3059 {
3060         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
3061         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
3062         HANDLE winusb_handle;
3063         int current_interface;
3064
3065         CHECK_WINUSBX_AVAILABLE(sub_api);
3066
3067         current_interface = interface_by_endpoint(priv, handle_priv, endpoint);
3068         if (current_interface < 0) {
3069                 usbi_err(HANDLE_CTX(dev_handle), "unable to match endpoint to an open interface - cannot clear");
3070                 return LIBUSB_ERROR_NOT_FOUND;
3071         }
3072
3073         usbi_dbg("matched endpoint %02X with interface %d", endpoint, current_interface);
3074         winusb_handle = handle_priv->interface_handle[current_interface].api_handle;
3075
3076         if (!WinUSBX[sub_api].ResetPipe(winusb_handle, endpoint)) {
3077                 usbi_err(HANDLE_CTX(dev_handle), "ResetPipe failed: %s", windows_error_str(0));
3078                 return LIBUSB_ERROR_NO_DEVICE;
3079         }
3080
3081         return LIBUSB_SUCCESS;
3082 }
3083
3084 static int winusbx_cancel_transfer(int sub_api, struct usbi_transfer *itransfer)
3085 {
3086         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
3087         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(transfer->dev_handle);
3088         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
3089         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
3090         int current_interface = transfer_priv->interface_number;
3091         HANDLE handle;
3092
3093         CHECK_WINUSBX_AVAILABLE(sub_api);
3094
3095         usbi_dbg("will use interface %d", current_interface);
3096
3097         handle = handle_priv->interface_handle[current_interface].api_handle;
3098         if (!WinUSBX[sub_api].AbortPipe(handle, transfer->endpoint)) {
3099                 usbi_err(TRANSFER_CTX(transfer), "AbortPipe failed: %s", windows_error_str(0));
3100                 return LIBUSB_ERROR_NO_DEVICE;
3101         }
3102
3103         return LIBUSB_SUCCESS;
3104 }
3105
3106 /*
3107  * from the "How to Use WinUSB to Communicate with a USB Device" Microsoft white paper
3108  * (http://www.microsoft.com/whdc/connect/usb/winusb_howto.mspx):
3109  * "WinUSB does not support host-initiated reset port and cycle port operations" and
3110  * IOCTL_INTERNAL_USB_CYCLE_PORT is only available in kernel mode and the
3111  * IOCTL_USB_HUB_CYCLE_PORT ioctl was removed from Vista => the best we can do is
3112  * cycle the pipes (and even then, the control pipe can not be reset using WinUSB)
3113  */
3114 // TODO: (post hotplug): see if we can force eject the device and redetect it (reuse hotplug?)
3115 static int winusbx_reset_device(int sub_api, struct libusb_device_handle *dev_handle)
3116 {
3117         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
3118         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
3119         HANDLE winusb_handle;
3120         int i, j;
3121
3122         CHECK_WINUSBX_AVAILABLE(sub_api);
3123
3124         // Reset any available pipe (except control)
3125         for (i = 0; i < USB_MAXINTERFACES; i++) {
3126                 winusb_handle = handle_priv->interface_handle[i].api_handle;
3127                 if (HANDLE_VALID(winusb_handle)) {
3128                         for (j = 0; j < priv->usb_interface[i].nb_endpoints; j++) {
3129                                 usbi_dbg("resetting ep %02X", priv->usb_interface[i].endpoint[j]);
3130                                 if (!WinUSBX[sub_api].AbortPipe(winusb_handle, priv->usb_interface[i].endpoint[j]))
3131                                         usbi_err(HANDLE_CTX(dev_handle), "AbortPipe (pipe address %02X) failed: %s",
3132                                                 priv->usb_interface[i].endpoint[j], windows_error_str(0));
3133
3134                                 // FlushPipe seems to fail on OUT pipes
3135                                 if (IS_EPIN(priv->usb_interface[i].endpoint[j])
3136                                                 && (!WinUSBX[sub_api].FlushPipe(winusb_handle, priv->usb_interface[i].endpoint[j])))
3137                                         usbi_err(HANDLE_CTX(dev_handle), "FlushPipe (pipe address %02X) failed: %s",
3138                                                 priv->usb_interface[i].endpoint[j], windows_error_str(0));
3139
3140                                 if (!WinUSBX[sub_api].ResetPipe(winusb_handle, priv->usb_interface[i].endpoint[j]))
3141                                         usbi_err(HANDLE_CTX(dev_handle), "ResetPipe (pipe address %02X) failed: %s",
3142                                                 priv->usb_interface[i].endpoint[j], windows_error_str(0));
3143                         }
3144                 }
3145         }
3146
3147         // libusbK & libusb0 have the ability to issue an actual device reset
3148         if ((sub_api != SUB_API_WINUSB) && (WinUSBX[sub_api].ResetDevice != NULL)) {
3149                 winusb_handle = handle_priv->interface_handle[0].api_handle;
3150                 if (HANDLE_VALID(winusb_handle))
3151                         WinUSBX[sub_api].ResetDevice(winusb_handle);
3152         }
3153
3154         return LIBUSB_SUCCESS;
3155 }
3156
3157 static enum libusb_transfer_status winusbx_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, DWORD length)
3158 {
3159         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
3160         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
3161         int i;
3162
3163         if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) {
3164                 // for isochronous, need to copy the individual iso packet actual_lengths and statuses
3165                 if ((sub_api == SUB_API_LIBUSBK) || (sub_api == SUB_API_LIBUSB0)) {
3166                         // iso only supported on libusbk-based backends for now
3167                         PKISO_CONTEXT iso_context = transfer_priv->iso_context;
3168                         for (i = 0; i < transfer->num_iso_packets; i++) {
3169                                 transfer->iso_packet_desc[i].actual_length = iso_context->IsoPackets[i].actual_length;
3170                                 // TODO translate USDB_STATUS codes http://msdn.microsoft.com/en-us/library/ff539136(VS.85).aspx to libusb_transfer_status
3171                                 //transfer->iso_packet_desc[i].status = transfer_priv->iso_context->IsoPackets[i].status;
3172                         }
3173                 } else if (sub_api == SUB_API_WINUSB) {
3174                         if (IS_XFERIN(transfer)) {
3175                                 /* Convert isochronous packet descriptor between Windows and libusb representation.
3176                                  * Both representation are guaranteed to have the same length in bytes.*/
3177                                 PUSBD_ISO_PACKET_DESCRIPTOR usbd_iso_packet_desc = (PUSBD_ISO_PACKET_DESCRIPTOR)transfer->iso_packet_desc;
3178                                 for (i = 0; i < transfer->num_iso_packets; i++) {
3179                                         unsigned int packet_length = (i < transfer->num_iso_packets - 1) ? (usbd_iso_packet_desc[i + 1].Offset - usbd_iso_packet_desc[i].Offset) : usbd_iso_packet_desc[i].Length;
3180                                         unsigned int actual_length = usbd_iso_packet_desc[i].Length;
3181                                         USBD_STATUS status = usbd_iso_packet_desc[i].Status;
3182
3183                                         transfer->iso_packet_desc[i].length = packet_length;
3184                                         transfer->iso_packet_desc[i].actual_length = actual_length;
3185                                         transfer->iso_packet_desc[i].status = usbd_status_to_libusb_transfer_status(status);
3186                                 }
3187                         } else {
3188                                 for (i = 0; i < transfer->num_iso_packets; i++) {
3189                                         transfer->iso_packet_desc[i].status = LIBUSB_TRANSFER_COMPLETED;
3190                                 }
3191                         }
3192                 } else {
3193                         // This should only occur if backend is not set correctly or other backend isoc is partially implemented
3194                         PRINT_UNSUPPORTED_API(copy_transfer_data);
3195                         return LIBUSB_TRANSFER_ERROR;
3196                 }
3197         }
3198
3199         itransfer->transferred += (int)length;
3200         return LIBUSB_TRANSFER_COMPLETED;
3201 }
3202
3203 /*
3204  * Internal HID Support functions (from libusb-win32)
3205  * Note that functions that complete data transfer synchronously must return
3206  * LIBUSB_COMPLETED instead of LIBUSB_SUCCESS
3207  */
3208 static int _hid_get_hid_descriptor(struct hid_device_priv *dev, void *data, size_t *size);
3209 static int _hid_get_report_descriptor(struct hid_device_priv *dev, void *data, size_t *size);
3210
3211 static int _hid_wcslen(WCHAR *str)
3212 {
3213         int i = 0;
3214
3215         while (str[i] && (str[i] != 0x409))
3216                 i++;
3217
3218         return i;
3219 }
3220
3221 static int _hid_get_device_descriptor(struct hid_device_priv *hid_priv, void *data, size_t *size)
3222 {
3223         struct libusb_device_descriptor d;
3224
3225         d.bLength = LIBUSB_DT_DEVICE_SIZE;
3226         d.bDescriptorType = LIBUSB_DT_DEVICE;
3227         d.bcdUSB = 0x0200; /* 2.00 */
3228         d.bDeviceClass = 0;
3229         d.bDeviceSubClass = 0;
3230         d.bDeviceProtocol = 0;
3231         d.bMaxPacketSize0 = 64; /* fix this! */
3232         d.idVendor = (uint16_t)hid_priv->vid;
3233         d.idProduct = (uint16_t)hid_priv->pid;
3234         d.bcdDevice = 0x0100;
3235         d.iManufacturer = hid_priv->string_index[0];
3236         d.iProduct = hid_priv->string_index[1];
3237         d.iSerialNumber = hid_priv->string_index[2];
3238         d.bNumConfigurations = 1;
3239
3240         if (*size > LIBUSB_DT_DEVICE_SIZE)
3241                 *size = LIBUSB_DT_DEVICE_SIZE;
3242         memcpy(data, &d, *size);
3243
3244         return LIBUSB_COMPLETED;
3245 }
3246
3247 static int _hid_get_config_descriptor(struct hid_device_priv *hid_priv, void *data, size_t *size)
3248 {
3249         char num_endpoints = 0;
3250         size_t config_total_len = 0;
3251         char tmp[HID_MAX_CONFIG_DESC_SIZE];
3252         struct libusb_config_descriptor *cd;
3253         struct libusb_interface_descriptor *id;
3254         struct libusb_hid_descriptor *hd;
3255         struct libusb_endpoint_descriptor *ed;
3256         size_t tmp_size;
3257
3258         if (hid_priv->input_report_size)
3259                 num_endpoints++;
3260         if (hid_priv->output_report_size)
3261                 num_endpoints++;
3262
3263         config_total_len = LIBUSB_DT_CONFIG_SIZE + LIBUSB_DT_INTERFACE_SIZE
3264                 + LIBUSB_DT_HID_SIZE + num_endpoints * LIBUSB_DT_ENDPOINT_SIZE;
3265
3266         cd = (struct libusb_config_descriptor *)tmp;
3267         id = (struct libusb_interface_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE);
3268         hd = (struct libusb_hid_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE
3269                 + LIBUSB_DT_INTERFACE_SIZE);
3270         ed = (struct libusb_endpoint_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE
3271                 + LIBUSB_DT_INTERFACE_SIZE
3272                 + LIBUSB_DT_HID_SIZE);
3273
3274         cd->bLength = LIBUSB_DT_CONFIG_SIZE;
3275         cd->bDescriptorType = LIBUSB_DT_CONFIG;
3276         cd->wTotalLength = (uint16_t)config_total_len;
3277         cd->bNumInterfaces = 1;
3278         cd->bConfigurationValue = 1;
3279         cd->iConfiguration = 0;
3280         cd->bmAttributes = 1 << 7; /* bus powered */
3281         cd->MaxPower = 50;
3282
3283         id->bLength = LIBUSB_DT_INTERFACE_SIZE;
3284         id->bDescriptorType = LIBUSB_DT_INTERFACE;
3285         id->bInterfaceNumber = 0;
3286         id->bAlternateSetting = 0;
3287         id->bNumEndpoints = num_endpoints;
3288         id->bInterfaceClass = 3;
3289         id->bInterfaceSubClass = 0;
3290         id->bInterfaceProtocol = 0;
3291         id->iInterface = 0;
3292
3293         tmp_size = LIBUSB_DT_HID_SIZE;
3294         _hid_get_hid_descriptor(hid_priv, hd, &tmp_size);
3295
3296         if (hid_priv->input_report_size) {
3297                 ed->bLength = LIBUSB_DT_ENDPOINT_SIZE;
3298                 ed->bDescriptorType = LIBUSB_DT_ENDPOINT;
3299                 ed->bEndpointAddress = HID_IN_EP;
3300                 ed->bmAttributes = 3;
3301                 ed->wMaxPacketSize = hid_priv->input_report_size - 1;
3302                 ed->bInterval = 10;
3303                 ed = (struct libusb_endpoint_descriptor *)((char *)ed + LIBUSB_DT_ENDPOINT_SIZE);
3304         }
3305
3306         if (hid_priv->output_report_size) {
3307                 ed->bLength = LIBUSB_DT_ENDPOINT_SIZE;
3308                 ed->bDescriptorType = LIBUSB_DT_ENDPOINT;
3309                 ed->bEndpointAddress = HID_OUT_EP;
3310                 ed->bmAttributes = 3;
3311                 ed->wMaxPacketSize = hid_priv->output_report_size - 1;
3312                 ed->bInterval = 10;
3313         }
3314
3315         if (*size > config_total_len)
3316                 *size = config_total_len;
3317         memcpy(data, tmp, *size);
3318
3319         return LIBUSB_COMPLETED;
3320 }
3321
3322 static int _hid_get_string_descriptor(struct hid_device_priv *hid_priv, int _index,
3323         void *data, size_t *size, HANDLE hid_handle)
3324 {
3325         void *tmp = NULL;
3326         WCHAR string[MAX_USB_STRING_LENGTH];
3327         size_t tmp_size = 0;
3328         int i;
3329
3330         /* language ID, EN-US */
3331         char string_langid[] = {0x09, 0x04};
3332
3333         if (_index == 0) {
3334                 tmp = string_langid;
3335                 tmp_size = sizeof(string_langid) + 2;
3336         } else {
3337                 for (i = 0; i < 3; i++) {
3338                         if (_index == (hid_priv->string_index[i])) {
3339                                 tmp = hid_priv->string[i];
3340                                 tmp_size = (_hid_wcslen(hid_priv->string[i]) + 1) * sizeof(WCHAR);
3341                                 break;
3342                         }
3343                 }
3344
3345                 if (i == 3) {
3346                         if (!HidD_GetIndexedString(hid_handle, _index, string, sizeof(string)))
3347                                 return LIBUSB_ERROR_INVALID_PARAM;
3348                         tmp = string;
3349                         tmp_size = (_hid_wcslen(string) + 1) * sizeof(WCHAR);
3350                 }
3351         }
3352
3353         if (!tmp_size)
3354                 return LIBUSB_ERROR_INVALID_PARAM;
3355
3356         if (tmp_size < *size)
3357                 *size = tmp_size;
3358
3359         // 2 byte header
3360         ((uint8_t *)data)[0] = (uint8_t)*size;
3361         ((uint8_t *)data)[1] = LIBUSB_DT_STRING;
3362         memcpy((uint8_t *)data + 2, tmp, *size - 2);
3363
3364         return LIBUSB_COMPLETED;
3365 }
3366
3367 static int _hid_get_hid_descriptor(struct hid_device_priv *hid_priv, void *data, size_t *size)
3368 {
3369         struct libusb_hid_descriptor d;
3370         uint8_t tmp[MAX_HID_DESCRIPTOR_SIZE];
3371         size_t report_len = MAX_HID_DESCRIPTOR_SIZE;
3372
3373         _hid_get_report_descriptor(hid_priv, tmp, &report_len);
3374
3375         d.bLength = LIBUSB_DT_HID_SIZE;
3376         d.bDescriptorType = LIBUSB_DT_HID;
3377         d.bcdHID = 0x0110; /* 1.10 */
3378         d.bCountryCode = 0;
3379         d.bNumDescriptors = 1;
3380         d.bClassDescriptorType = LIBUSB_DT_REPORT;
3381         d.wClassDescriptorLength = (uint16_t)report_len;
3382
3383         if (*size > LIBUSB_DT_HID_SIZE)
3384                 *size = LIBUSB_DT_HID_SIZE;
3385         memcpy(data, &d, *size);
3386
3387         return LIBUSB_COMPLETED;
3388 }
3389
3390 static int _hid_get_report_descriptor(struct hid_device_priv *hid_priv, void *data, size_t *size)
3391 {
3392         uint8_t d[MAX_HID_DESCRIPTOR_SIZE];
3393         size_t i = 0;
3394
3395         /* usage page */
3396         d[i++] = 0x06; d[i++] = hid_priv->usagePage & 0xFF; d[i++] = hid_priv->usagePage >> 8;
3397         /* usage */
3398         d[i++] = 0x09; d[i++] = (uint8_t)hid_priv->usage;
3399         /* start collection (application) */
3400         d[i++] = 0xA1; d[i++] = 0x01;
3401         /* input report */
3402         if (hid_priv->input_report_size) {
3403                 /* usage (vendor defined) */
3404                 d[i++] = 0x09; d[i++] = 0x01;
3405                 /* logical minimum (0) */
3406                 d[i++] = 0x15; d[i++] = 0x00;
3407                 /* logical maximum (255) */
3408                 d[i++] = 0x25; d[i++] = 0xFF;
3409                 /* report size (8 bits) */
3410                 d[i++] = 0x75; d[i++] = 0x08;
3411                 /* report count */
3412                 d[i++] = 0x95; d[i++] = (uint8_t)hid_priv->input_report_size - 1;
3413                 /* input (data, variable, absolute) */
3414                 d[i++] = 0x81; d[i++] = 0x00;
3415         }
3416         /* output report */
3417         if (hid_priv->output_report_size) {
3418                 /* usage (vendor defined) */
3419                 d[i++] = 0x09; d[i++] = 0x02;
3420                 /* logical minimum (0) */
3421                 d[i++] = 0x15; d[i++] = 0x00;
3422                 /* logical maximum (255) */
3423                 d[i++] = 0x25; d[i++] = 0xFF;
3424                 /* report size (8 bits) */
3425                 d[i++] = 0x75; d[i++] = 0x08;
3426                 /* report count */
3427                 d[i++] = 0x95; d[i++] = (uint8_t)hid_priv->output_report_size - 1;
3428                 /* output (data, variable, absolute) */
3429                 d[i++] = 0x91; d[i++] = 0x00;
3430         }
3431         /* feature report */
3432         if (hid_priv->feature_report_size) {
3433                 /* usage (vendor defined) */
3434                 d[i++] = 0x09; d[i++] = 0x03;
3435                 /* logical minimum (0) */
3436                 d[i++] = 0x15; d[i++] = 0x00;
3437                 /* logical maximum (255) */
3438                 d[i++] = 0x25; d[i++] = 0xFF;
3439                 /* report size (8 bits) */
3440                 d[i++] = 0x75; d[i++] = 0x08;
3441                 /* report count */
3442                 d[i++] = 0x95; d[i++] = (uint8_t)hid_priv->feature_report_size - 1;
3443                 /* feature (data, variable, absolute) */
3444                 d[i++] = 0xb2; d[i++] = 0x02; d[i++] = 0x01;
3445         }
3446
3447         /* end collection */
3448         d[i++] = 0xC0;
3449
3450         if (*size > i)
3451                 *size = i;
3452         memcpy(data, d, *size);
3453
3454         return LIBUSB_COMPLETED;
3455 }
3456
3457 static int _hid_get_descriptor(struct libusb_device *dev, HANDLE hid_handle, int recipient,
3458         int type, int _index, void *data, size_t *size)
3459 {
3460         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
3461         UNUSED(recipient);
3462
3463         switch (type) {
3464         case LIBUSB_DT_DEVICE:
3465                 usbi_dbg("LIBUSB_DT_DEVICE");
3466                 return _hid_get_device_descriptor(priv->hid, data, size);
3467         case LIBUSB_DT_CONFIG:
3468                 usbi_dbg("LIBUSB_DT_CONFIG");
3469                 if (!_index)
3470                         return _hid_get_config_descriptor(priv->hid, data, size);
3471                 return LIBUSB_ERROR_INVALID_PARAM;
3472         case LIBUSB_DT_STRING:
3473                 usbi_dbg("LIBUSB_DT_STRING");
3474                 return _hid_get_string_descriptor(priv->hid, _index, data, size, hid_handle);
3475         case LIBUSB_DT_HID:
3476                 usbi_dbg("LIBUSB_DT_HID");
3477                 if (!_index)
3478                         return _hid_get_hid_descriptor(priv->hid, data, size);
3479                 return LIBUSB_ERROR_INVALID_PARAM;
3480         case LIBUSB_DT_REPORT:
3481                 usbi_dbg("LIBUSB_DT_REPORT");
3482                 if (!_index)
3483                         return _hid_get_report_descriptor(priv->hid, data, size);
3484                 return LIBUSB_ERROR_INVALID_PARAM;
3485         case LIBUSB_DT_PHYSICAL:
3486                 usbi_dbg("LIBUSB_DT_PHYSICAL");
3487                 if (HidD_GetPhysicalDescriptor(hid_handle, data, (ULONG)*size))
3488                         return LIBUSB_COMPLETED;
3489                 return LIBUSB_ERROR_OTHER;
3490         }
3491
3492         usbi_warn(DEVICE_CTX(dev), "unsupported");
3493         return LIBUSB_ERROR_NOT_SUPPORTED;
3494 }
3495
3496 static int _hid_get_report(struct libusb_device *dev, HANDLE hid_handle, int id, void *data,
3497         struct winusb_transfer_priv *tp, size_t size, OVERLAPPED *overlapped, int report_type)
3498 {
3499         DWORD ioctl_code, expected_size = (DWORD)size;
3500         uint8_t *buf;
3501
3502         if (tp->hid_buffer != NULL)
3503                 usbi_err(DEVICE_CTX(dev), "program assertion failed - hid_buffer is not NULL");
3504
3505         if ((size == 0) || (size > MAX_HID_REPORT_SIZE)) {
3506                 usbi_warn(DEVICE_CTX(dev), "invalid size (%"PRIuPTR")", (uintptr_t)size);
3507                 return LIBUSB_ERROR_INVALID_PARAM;
3508         }
3509
3510         switch (report_type) {
3511         case HID_REPORT_TYPE_INPUT:
3512                 ioctl_code = IOCTL_HID_GET_INPUT_REPORT;
3513                 break;
3514         case HID_REPORT_TYPE_FEATURE:
3515                 ioctl_code = IOCTL_HID_GET_FEATURE;
3516                 break;
3517         default:
3518                 usbi_warn(DEVICE_CTX(dev), "unknown HID report type %d", report_type);
3519                 return LIBUSB_ERROR_INVALID_PARAM;
3520         }
3521
3522         // Add a trailing byte to detect overflows
3523         buf = calloc(1, expected_size + 1);
3524         if (buf == NULL)
3525                 return LIBUSB_ERROR_NO_MEM;
3526
3527         buf[0] = (uint8_t)id; // Must be set always
3528         usbi_dbg("report ID: 0x%02X", buf[0]);
3529
3530         // NB: The size returned by DeviceIoControl doesn't include report IDs when not in use (0)
3531         if (!DeviceIoControl(hid_handle, ioctl_code, buf, expected_size + 1,
3532                 buf, expected_size + 1, NULL, overlapped)) {
3533                 if (GetLastError() != ERROR_IO_PENDING) {
3534                         usbi_err(DEVICE_CTX(dev), "failed to read HID Report: %s", windows_error_str(0));
3535                         free(buf);
3536                         return LIBUSB_ERROR_IO;
3537                 }
3538         }
3539
3540         // Asynchronous wait
3541         tp->hid_buffer = buf;
3542         tp->hid_dest = data; // copy dest, as not necessarily the start of the transfer buffer
3543         tp->hid_expected_size = expected_size;
3544
3545         return LIBUSB_SUCCESS;
3546 }
3547
3548 static int _hid_set_report(struct libusb_device *dev, HANDLE hid_handle, int id, void *data,
3549         struct winusb_transfer_priv *tp, size_t size, OVERLAPPED *overlapped, int report_type)
3550 {
3551         DWORD ioctl_code, write_size = (DWORD)size;
3552         // If an id is reported, we must allow MAX_HID_REPORT_SIZE + 1
3553         size_t max_report_size = MAX_HID_REPORT_SIZE + (id ? 1 : 0);
3554         uint8_t *buf;
3555
3556         if (tp->hid_buffer != NULL)
3557                 usbi_err(DEVICE_CTX(dev), "program assertion failed - hid_buffer is not NULL");
3558
3559         if ((size == 0) || (size > max_report_size)) {
3560                 usbi_warn(DEVICE_CTX(dev), "invalid size (%"PRIuPTR")", (uintptr_t)size);
3561                 return LIBUSB_ERROR_INVALID_PARAM;
3562         }
3563
3564         switch (report_type) {
3565         case HID_REPORT_TYPE_OUTPUT:
3566                 ioctl_code = IOCTL_HID_SET_OUTPUT_REPORT;
3567                 break;
3568         case HID_REPORT_TYPE_FEATURE:
3569                 ioctl_code = IOCTL_HID_SET_FEATURE;
3570                 break;
3571         default:
3572                 usbi_warn(DEVICE_CTX(dev), "unknown HID report type %d", report_type);
3573                 return LIBUSB_ERROR_INVALID_PARAM;
3574         }
3575
3576         usbi_dbg("report ID: 0x%02X", id);
3577         // When report IDs are not used (i.e. when id == 0), we must add
3578         // a null report ID. Otherwise, we just use original data buffer
3579         if (id == 0)
3580                 write_size++;
3581
3582         buf = malloc(write_size);
3583         if (buf == NULL)
3584                 return LIBUSB_ERROR_NO_MEM;
3585
3586         if (id == 0) {
3587                 buf[0] = 0;
3588                 memcpy(buf + 1, data, size);
3589         } else {
3590                 // This seems like a waste, but if we don't duplicate the
3591                 // data, we'll get issues when freeing hid_buffer
3592                 memcpy(buf, data, size);
3593                 if (buf[0] != id)
3594                         usbi_warn(DEVICE_CTX(dev), "mismatched report ID (data is %02X, parameter is %02X)", buf[0], id);
3595         }
3596
3597         // NB: The size returned by DeviceIoControl doesn't include report IDs when not in use (0)
3598         if (!DeviceIoControl(hid_handle, ioctl_code, buf, write_size,
3599                 buf, write_size, NULL, overlapped)) {
3600                 if (GetLastError() != ERROR_IO_PENDING) {
3601                         usbi_err(DEVICE_CTX(dev), "failed to write HID Output Report: %s", windows_error_str(0));
3602                         free(buf);
3603                         return LIBUSB_ERROR_IO;
3604                 }
3605         }
3606
3607         tp->hid_buffer = buf;
3608         tp->hid_dest = NULL;
3609         return LIBUSB_SUCCESS;
3610 }
3611
3612 static int _hid_class_request(struct libusb_device *dev, HANDLE hid_handle, int request_type,
3613         int request, int value, int _index, void *data, struct winusb_transfer_priv *tp,
3614         size_t size, OVERLAPPED *overlapped)
3615 {
3616         int report_type = (value >> 8) & 0xFF;
3617         int report_id = value & 0xFF;
3618
3619         UNUSED(_index);
3620
3621         if ((LIBUSB_REQ_RECIPIENT(request_type) != LIBUSB_RECIPIENT_INTERFACE)
3622                         && (LIBUSB_REQ_RECIPIENT(request_type) != LIBUSB_RECIPIENT_DEVICE))
3623                 return LIBUSB_ERROR_INVALID_PARAM;
3624
3625         if (LIBUSB_REQ_OUT(request_type) && request == HID_REQ_SET_REPORT)
3626                 return _hid_set_report(dev, hid_handle, report_id, data, tp, size, overlapped, report_type);
3627
3628         if (LIBUSB_REQ_IN(request_type) && request == HID_REQ_GET_REPORT)
3629                 return _hid_get_report(dev, hid_handle, report_id, data, tp, size, overlapped, report_type);
3630
3631         return LIBUSB_ERROR_INVALID_PARAM;
3632 }
3633
3634 /*
3635  * HID API functions
3636  */
3637 static bool hid_init(struct libusb_context *ctx)
3638 {
3639         DLL_GET_HANDLE(ctx, hid);
3640
3641         DLL_LOAD_FUNC(hid, HidD_GetAttributes, true);
3642         DLL_LOAD_FUNC(hid, HidD_GetHidGuid, true);
3643         DLL_LOAD_FUNC(hid, HidD_GetPreparsedData, true);
3644         DLL_LOAD_FUNC(hid, HidD_FreePreparsedData, true);
3645         DLL_LOAD_FUNC(hid, HidD_GetManufacturerString, true);
3646         DLL_LOAD_FUNC(hid, HidD_GetProductString, true);
3647         DLL_LOAD_FUNC(hid, HidD_GetSerialNumberString, true);
3648         DLL_LOAD_FUNC(hid, HidD_GetIndexedString, true);
3649         DLL_LOAD_FUNC(hid, HidP_GetCaps, true);
3650         DLL_LOAD_FUNC(hid, HidD_SetNumInputBuffers, true);
3651         DLL_LOAD_FUNC(hid, HidD_GetPhysicalDescriptor, true);
3652         DLL_LOAD_FUNC(hid, HidD_FlushQueue, true);
3653         DLL_LOAD_FUNC(hid, HidP_GetValueCaps, true);
3654
3655         return true;
3656 }
3657
3658 static void hid_exit(void)
3659 {
3660         DLL_FREE_HANDLE(hid);
3661 }
3662
3663 // NB: open and close must ensure that they only handle interface of
3664 // the right API type, as these functions can be called wholesale from
3665 // composite_open(), with interfaces belonging to different APIs
3666 static int hid_open(int sub_api, struct libusb_device_handle *dev_handle)
3667 {
3668         struct libusb_device *dev = dev_handle->dev;
3669         struct winusb_device_priv *priv = usbi_get_device_priv(dev);
3670         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
3671         HIDD_ATTRIBUTES hid_attributes;
3672         PHIDP_PREPARSED_DATA preparsed_data = NULL;
3673         HIDP_CAPS capabilities;
3674         HIDP_VALUE_CAPS *value_caps;
3675         HANDLE hid_handle = INVALID_HANDLE_VALUE;
3676         int i, j;
3677         // report IDs handling
3678         ULONG size[3];
3679         int nb_ids[2]; // zero and nonzero report IDs
3680 #if defined(ENABLE_LOGGING)
3681         const char * const type[3] = {"input", "output", "feature"};
3682 #endif
3683
3684         UNUSED(sub_api);
3685         CHECK_HID_AVAILABLE;
3686
3687         if (priv->hid == NULL) {
3688                 usbi_err(HANDLE_CTX(dev_handle), "program assertion failed - private HID structure is uninitialized");
3689                 return LIBUSB_ERROR_NOT_FOUND;
3690         }
3691
3692         for (i = 0; i < USB_MAXINTERFACES; i++) {
3693                 if ((priv->usb_interface[i].path != NULL)
3694                                 && (priv->usb_interface[i].apib->id == USB_API_HID)) {
3695                         hid_handle = windows_open(dev_handle, priv->usb_interface[i].path, GENERIC_READ | GENERIC_WRITE);
3696                         /*
3697                          * http://www.lvr.com/hidfaq.htm: Why do I receive "Access denied" when attempting to access my HID?
3698                          * "Windows 2000 and later have exclusive read/write access to HIDs that are configured as a system
3699                          * keyboards or mice. An application can obtain a handle to a system keyboard or mouse by not
3700                          * requesting READ or WRITE access with CreateFile. Applications can then use HidD_SetFeature and
3701                          * HidD_GetFeature (if the device supports Feature reports)."
3702                          */
3703                         if (hid_handle == INVALID_HANDLE_VALUE) {
3704                                 usbi_warn(HANDLE_CTX(dev_handle), "could not open HID device in R/W mode (keyboard or mouse?) - trying without");
3705                                 hid_handle = windows_open(dev_handle, priv->usb_interface[i].path, 0);
3706                                 if (hid_handle == INVALID_HANDLE_VALUE) {
3707                                         usbi_err(HANDLE_CTX(dev_handle), "could not open device %s (interface %d): %s", priv->path, i, windows_error_str(0));
3708                                         switch (GetLastError()) {
3709                                         case ERROR_FILE_NOT_FOUND: // The device was disconnected
3710                                                 return LIBUSB_ERROR_NO_DEVICE;
3711                                         case ERROR_ACCESS_DENIED:
3712                                                 return LIBUSB_ERROR_ACCESS;
3713                                         default:
3714                                                 return LIBUSB_ERROR_IO;
3715                                         }
3716                                 }
3717                                 priv->usb_interface[i].restricted_functionality = true;
3718                         }
3719                         handle_priv->interface_handle[i].api_handle = hid_handle;
3720                 }
3721         }
3722
3723         hid_attributes.Size = sizeof(hid_attributes);
3724         do {
3725                 if (!HidD_GetAttributes(hid_handle, &hid_attributes)) {
3726                         usbi_err(HANDLE_CTX(dev_handle), "could not gain access to HID top collection (HidD_GetAttributes)");
3727                         break;
3728                 }
3729
3730                 priv->hid->vid = hid_attributes.VendorID;
3731                 priv->hid->pid = hid_attributes.ProductID;
3732
3733                 // Set the maximum available input buffer size
3734                 for (i = 32; HidD_SetNumInputBuffers(hid_handle, i); i *= 2);
3735                 usbi_dbg("set maximum input buffer size to %d", i / 2);
3736
3737                 // Get the maximum input and output report size
3738                 if (!HidD_GetPreparsedData(hid_handle, &preparsed_data) || !preparsed_data) {
3739                         usbi_err(HANDLE_CTX(dev_handle), "could not read HID preparsed data (HidD_GetPreparsedData)");
3740                         break;
3741                 }
3742                 if (HidP_GetCaps(preparsed_data, &capabilities) != HIDP_STATUS_SUCCESS) {
3743                         usbi_err(HANDLE_CTX(dev_handle), "could not parse HID capabilities (HidP_GetCaps)");
3744                         break;
3745                 }
3746
3747                 // Find out if interrupt will need report IDs
3748                 size[0] = capabilities.NumberInputValueCaps;
3749                 size[1] = capabilities.NumberOutputValueCaps;
3750                 size[2] = capabilities.NumberFeatureValueCaps;
3751                 for (j = HidP_Input; j <= HidP_Feature; j++) {
3752                         usbi_dbg("%lu HID %s report value(s) found", ULONG_CAST(size[j]), type[j]);
3753                         priv->hid->uses_report_ids[j] = false;
3754                         if (size[j] > 0) {
3755                                 value_caps = calloc(size[j], sizeof(HIDP_VALUE_CAPS));
3756                                 if ((value_caps != NULL)
3757                                                 && (HidP_GetValueCaps((HIDP_REPORT_TYPE)j, value_caps, &size[j], preparsed_data) == HIDP_STATUS_SUCCESS)
3758                                                 && (size[j] >= 1)) {
3759                                         nb_ids[0] = 0;
3760                                         nb_ids[1] = 0;
3761                                         for (i = 0; i < (int)size[j]; i++) {
3762                                                 usbi_dbg("  Report ID: 0x%02X", value_caps[i].ReportID);
3763                                                 if (value_caps[i].ReportID != 0)
3764                                                         nb_ids[1]++;
3765                                                 else
3766                                                         nb_ids[0]++;
3767                                         }
3768                                         if (nb_ids[1] != 0) {
3769                                                 if (nb_ids[0] != 0)
3770                                                         usbi_warn(HANDLE_CTX(dev_handle), "program assertion failed - zero and nonzero report IDs used for %s",
3771                                                                 type[j]);
3772                                                 priv->hid->uses_report_ids[j] = true;
3773                                         }
3774                                 } else {
3775                                         usbi_warn(HANDLE_CTX(dev_handle), "  could not process %s report IDs", type[j]);
3776                                 }
3777                                 free(value_caps);
3778                         }
3779                 }
3780
3781                 // Set the report sizes
3782                 priv->hid->input_report_size = capabilities.InputReportByteLength;
3783                 priv->hid->output_report_size = capabilities.OutputReportByteLength;
3784                 priv->hid->feature_report_size = capabilities.FeatureReportByteLength;
3785
3786                 // Store usage and usagePage values
3787                 priv->hid->usage = capabilities.Usage;
3788                 priv->hid->usagePage = capabilities.UsagePage;
3789
3790                 // Fetch string descriptors
3791                 priv->hid->string_index[0] = dev->device_descriptor.iManufacturer;
3792                 if (priv->hid->string_index[0] != 0)
3793                         HidD_GetManufacturerString(hid_handle, priv->hid->string[0], sizeof(priv->hid->string[0]));
3794                 else
3795                         priv->hid->string[0][0] = 0;
3796
3797                 priv->hid->string_index[1] = dev->device_descriptor.iProduct;
3798                 if (priv->hid->string_index[1] != 0)
3799                         HidD_GetProductString(hid_handle, priv->hid->string[1], sizeof(priv->hid->string[1]));
3800                 else
3801                         priv->hid->string[1][0] = 0;
3802
3803                 priv->hid->string_index[2] = dev->device_descriptor.iSerialNumber;
3804                 if (priv->hid->string_index[2] != 0)
3805                         HidD_GetSerialNumberString(hid_handle, priv->hid->string[2], sizeof(priv->hid->string[2]));
3806                 else
3807                         priv->hid->string[2][0] = 0;
3808         } while (0);
3809
3810         if (preparsed_data)
3811                 HidD_FreePreparsedData(preparsed_data);
3812
3813         return LIBUSB_SUCCESS;
3814 }
3815
3816 static void hid_close(int sub_api, struct libusb_device_handle *dev_handle)
3817 {
3818         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
3819         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
3820         HANDLE file_handle;
3821         int i;
3822
3823         UNUSED(sub_api);
3824
3825         if (DLL_HANDLE_NAME(hid) == NULL)
3826                 return;
3827
3828         for (i = 0; i < USB_MAXINTERFACES; i++) {
3829                 if (priv->usb_interface[i].apib->id == USB_API_HID) {
3830                         file_handle = handle_priv->interface_handle[i].api_handle;
3831                         if (HANDLE_VALID(file_handle))
3832                                 CloseHandle(file_handle);
3833                 }
3834         }
3835 }
3836
3837 static int hid_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface)
3838 {
3839         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
3840         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
3841
3842         UNUSED(sub_api);
3843         CHECK_HID_AVAILABLE;
3844
3845         // NB: Disconnection detection is not possible in this function
3846         if (priv->usb_interface[iface].path == NULL)
3847                 return LIBUSB_ERROR_NOT_FOUND; // invalid iface
3848
3849         // We use dev_handle as a flag for interface claimed
3850         if (handle_priv->interface_handle[iface].dev_handle == INTERFACE_CLAIMED)
3851                 return LIBUSB_ERROR_BUSY; // already claimed
3852
3853         handle_priv->interface_handle[iface].dev_handle = INTERFACE_CLAIMED;
3854
3855         usbi_dbg("claimed interface %u", iface);
3856         handle_priv->active_interface = iface;
3857
3858         return LIBUSB_SUCCESS;
3859 }
3860
3861 static int hid_release_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface)
3862 {
3863         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
3864         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
3865
3866         UNUSED(sub_api);
3867         CHECK_HID_AVAILABLE;
3868
3869         if (priv->usb_interface[iface].path == NULL)
3870                 return LIBUSB_ERROR_NOT_FOUND; // invalid iface
3871
3872         if (handle_priv->interface_handle[iface].dev_handle != INTERFACE_CLAIMED)
3873                 return LIBUSB_ERROR_NOT_FOUND; // invalid iface
3874
3875         handle_priv->interface_handle[iface].dev_handle = INVALID_HANDLE_VALUE;
3876
3877         return LIBUSB_SUCCESS;
3878 }
3879
3880 static int hid_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting)
3881 {
3882         UNUSED(sub_api);
3883         UNUSED(iface);
3884
3885         CHECK_HID_AVAILABLE;
3886
3887         if (altsetting != 0) {
3888                 usbi_err(HANDLE_CTX(dev_handle), "set interface altsetting not supported for altsetting >0");
3889                 return LIBUSB_ERROR_NOT_SUPPORTED;
3890         }
3891
3892         return LIBUSB_SUCCESS;
3893 }
3894
3895 static int hid_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer)
3896 {
3897         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
3898         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
3899         struct libusb_device_handle *dev_handle = transfer->dev_handle;
3900         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
3901         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
3902         WINUSB_SETUP_PACKET *setup = (WINUSB_SETUP_PACKET *)transfer->buffer;
3903         HANDLE hid_handle;
3904         OVERLAPPED *overlapped;
3905         int current_interface;
3906         uint8_t config;
3907         size_t size;
3908         int r;
3909
3910         UNUSED(sub_api);
3911         CHECK_HID_AVAILABLE;
3912
3913         safe_free(transfer_priv->hid_buffer);
3914         transfer_priv->hid_dest = NULL;
3915         size = transfer->length - LIBUSB_CONTROL_SETUP_SIZE;
3916
3917         if (size > MAX_CTRL_BUFFER_LENGTH)
3918                 return LIBUSB_ERROR_INVALID_PARAM;
3919
3920         current_interface = get_valid_interface(dev_handle, USB_API_HID);
3921         if (current_interface < 0) {
3922                 if (auto_claim(transfer, &current_interface, USB_API_HID) != LIBUSB_SUCCESS)
3923                         return LIBUSB_ERROR_NOT_FOUND;
3924         }
3925
3926         usbi_dbg("will use interface %d", current_interface);
3927
3928         hid_handle = handle_priv->interface_handle[current_interface].api_handle;
3929         set_transfer_priv_handle(itransfer, hid_handle);
3930         overlapped = get_transfer_priv_overlapped(itransfer);
3931
3932         switch (LIBUSB_REQ_TYPE(setup->RequestType)) {
3933         case LIBUSB_REQUEST_TYPE_STANDARD:
3934                 switch (setup->Request) {
3935                 case LIBUSB_REQUEST_GET_DESCRIPTOR:
3936                         r = _hid_get_descriptor(dev_handle->dev, hid_handle, LIBUSB_REQ_RECIPIENT(setup->RequestType),
3937                                 (setup->Value >> 8) & 0xFF, setup->Value & 0xFF, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, &size);
3938                         break;
3939                 case LIBUSB_REQUEST_GET_CONFIGURATION:
3940                         r = winusb_get_configuration(dev_handle, &config);
3941                         if (r == LIBUSB_SUCCESS) {
3942                                 size = 1;
3943                                 ((uint8_t *)transfer->buffer)[LIBUSB_CONTROL_SETUP_SIZE] = config;
3944                                 r = LIBUSB_COMPLETED;
3945                         }
3946                         break;
3947                 case LIBUSB_REQUEST_SET_CONFIGURATION:
3948                         if (setup->Value == priv->active_config) {
3949                                 r = LIBUSB_COMPLETED;
3950                         } else {
3951                                 usbi_warn(TRANSFER_CTX(transfer), "cannot set configuration other than the default one");
3952                                 r = LIBUSB_ERROR_NOT_SUPPORTED;
3953                         }
3954                         break;
3955                 case LIBUSB_REQUEST_GET_INTERFACE:
3956                         size = 1;
3957                         ((uint8_t *)transfer->buffer)[LIBUSB_CONTROL_SETUP_SIZE] = 0;
3958                         r = LIBUSB_COMPLETED;
3959                         break;
3960                 case LIBUSB_REQUEST_SET_INTERFACE:
3961                         r = hid_set_interface_altsetting(0, dev_handle, (uint8_t)setup->Index, (uint8_t)setup->Value);
3962                         if (r == LIBUSB_SUCCESS)
3963                                 r = LIBUSB_COMPLETED;
3964                         break;
3965                 default:
3966                         usbi_warn(TRANSFER_CTX(transfer), "unsupported HID control request");
3967                         return LIBUSB_ERROR_NOT_SUPPORTED;
3968                 }
3969                 break;
3970         case LIBUSB_REQUEST_TYPE_CLASS:
3971                 r = _hid_class_request(dev_handle->dev, hid_handle, setup->RequestType, setup->Request, setup->Value,
3972                         setup->Index, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, transfer_priv,
3973                         size, overlapped);
3974                 break;
3975         default:
3976                 usbi_warn(TRANSFER_CTX(transfer), "unsupported HID control request");
3977                 return LIBUSB_ERROR_NOT_SUPPORTED;
3978         }
3979
3980         if (r < 0)
3981                 return r;
3982
3983         if (r == LIBUSB_COMPLETED) {
3984                 // Force request to be completed synchronously. Transferred size has been set by previous call
3985                 windows_force_sync_completion(itransfer, (ULONG)size);
3986                 r = LIBUSB_SUCCESS;
3987         }
3988
3989         transfer_priv->interface_number = (uint8_t)current_interface;
3990
3991         return LIBUSB_SUCCESS;
3992 }
3993
3994 static int hid_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer)
3995 {
3996         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
3997         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
3998         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(transfer->dev_handle);
3999         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
4000         HANDLE hid_handle;
4001         OVERLAPPED *overlapped;
4002         bool direction_in;
4003         BOOL ret;
4004         int current_interface, length;
4005
4006         UNUSED(sub_api);
4007         CHECK_HID_AVAILABLE;
4008
4009         transfer_priv->hid_dest = NULL;
4010         safe_free(transfer_priv->hid_buffer);
4011
4012         current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
4013         if (current_interface < 0) {
4014                 usbi_err(TRANSFER_CTX(transfer), "unable to match endpoint to an open interface - cancelling transfer");
4015                 return LIBUSB_ERROR_NOT_FOUND;
4016         }
4017
4018         usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface);
4019
4020         hid_handle = handle_priv->interface_handle[current_interface].api_handle;
4021         set_transfer_priv_handle(itransfer, hid_handle);
4022         overlapped = get_transfer_priv_overlapped(itransfer);
4023         direction_in = IS_XFERIN(transfer);
4024
4025         // If report IDs are not in use, an extra prefix byte must be added
4026         if (((direction_in) && (!priv->hid->uses_report_ids[0]))
4027                         || ((!direction_in) && (!priv->hid->uses_report_ids[1])))
4028                 length = transfer->length + 1;
4029         else
4030                 length = transfer->length;
4031
4032         // Add a trailing byte to detect overflows on input
4033         transfer_priv->hid_buffer = calloc(1, length + 1);
4034         if (transfer_priv->hid_buffer == NULL)
4035                 return LIBUSB_ERROR_NO_MEM;
4036
4037         transfer_priv->hid_expected_size = length;
4038
4039         if (direction_in) {
4040                 transfer_priv->hid_dest = transfer->buffer;
4041                 usbi_dbg("reading %d bytes (report ID: 0x00)", length);
4042                 ret = ReadFile(hid_handle, transfer_priv->hid_buffer, length + 1, NULL, overlapped);
4043         } else {
4044                 if (!priv->hid->uses_report_ids[1])
4045                         memcpy(transfer_priv->hid_buffer + 1, transfer->buffer, transfer->length);
4046                 else
4047                         // We could actually do without the calloc and memcpy in this case
4048                         memcpy(transfer_priv->hid_buffer, transfer->buffer, transfer->length);
4049
4050                 usbi_dbg("writing %d bytes (report ID: 0x%02X)", length, transfer_priv->hid_buffer[0]);
4051                 ret = WriteFile(hid_handle, transfer_priv->hid_buffer, length, NULL, overlapped);
4052         }
4053
4054         if (!ret && GetLastError() != ERROR_IO_PENDING) {
4055                 usbi_err(TRANSFER_CTX(transfer), "HID transfer failed: %s", windows_error_str(0));
4056                 safe_free(transfer_priv->hid_buffer);
4057                 return LIBUSB_ERROR_IO;
4058         }
4059
4060         transfer_priv->interface_number = (uint8_t)current_interface;
4061
4062         return LIBUSB_SUCCESS;
4063 }
4064
4065 static int hid_reset_device(int sub_api, struct libusb_device_handle *dev_handle)
4066 {
4067         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
4068         HANDLE hid_handle;
4069         int current_interface;
4070
4071         UNUSED(sub_api);
4072         CHECK_HID_AVAILABLE;
4073
4074         // Flushing the queues on all interfaces is the best we can achieve
4075         for (current_interface = 0; current_interface < USB_MAXINTERFACES; current_interface++) {
4076                 hid_handle = handle_priv->interface_handle[current_interface].api_handle;
4077                 if (HANDLE_VALID(hid_handle))
4078                         HidD_FlushQueue(hid_handle);
4079         }
4080
4081         return LIBUSB_SUCCESS;
4082 }
4083
4084 static int hid_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint)
4085 {
4086         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
4087         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
4088         HANDLE hid_handle;
4089         int current_interface;
4090
4091         UNUSED(sub_api);
4092         CHECK_HID_AVAILABLE;
4093
4094         current_interface = interface_by_endpoint(priv, handle_priv, endpoint);
4095         if (current_interface < 0) {
4096                 usbi_err(HANDLE_CTX(dev_handle), "unable to match endpoint to an open interface - cannot clear");
4097                 return LIBUSB_ERROR_NOT_FOUND;
4098         }
4099
4100         usbi_dbg("matched endpoint %02X with interface %d", endpoint, current_interface);
4101         hid_handle = handle_priv->interface_handle[current_interface].api_handle;
4102
4103         // No endpoint selection with Microsoft's implementation, so we try to flush the
4104         // whole interface. Should be OK for most case scenarios
4105         if (!HidD_FlushQueue(hid_handle)) {
4106                 usbi_err(HANDLE_CTX(dev_handle), "Flushing of HID queue failed: %s", windows_error_str(0));
4107                 // Device was probably disconnected
4108                 return LIBUSB_ERROR_NO_DEVICE;
4109         }
4110
4111         return LIBUSB_SUCCESS;
4112 }
4113
4114 // This extra function is only needed for HID
4115 static enum libusb_transfer_status hid_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, DWORD length)
4116 {
4117         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
4118         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
4119         enum libusb_transfer_status r = LIBUSB_TRANSFER_COMPLETED;
4120
4121         UNUSED(sub_api);
4122
4123         if (transfer_priv->hid_buffer != NULL) {
4124                 // If we have a valid hid_buffer, it means the transfer was async
4125                 if (transfer_priv->hid_dest != NULL) { // Data readout
4126                         if (length > 0) {
4127                                 // First, check for overflow
4128                                 if ((size_t)length > transfer_priv->hid_expected_size) {
4129                                         usbi_err(TRANSFER_CTX(transfer), "OVERFLOW!");
4130                                         length = (DWORD)transfer_priv->hid_expected_size;
4131                                         r = LIBUSB_TRANSFER_OVERFLOW;
4132                                 }
4133
4134                                 if (transfer_priv->hid_buffer[0] == 0) {
4135                                         // Discard the 1 byte report ID prefix
4136                                         length--;
4137                                         memcpy(transfer_priv->hid_dest, transfer_priv->hid_buffer + 1, length);
4138                                 } else {
4139                                         memcpy(transfer_priv->hid_dest, transfer_priv->hid_buffer, length);
4140                                 }
4141                         }
4142                         transfer_priv->hid_dest = NULL;
4143                 }
4144                 // For write, we just need to free the hid buffer
4145                 safe_free(transfer_priv->hid_buffer);
4146         }
4147
4148         itransfer->transferred += (int)length;
4149         return r;
4150 }
4151
4152
4153 /*
4154  * Composite API functions
4155  */
4156 static int composite_open(int sub_api, struct libusb_device_handle *dev_handle)
4157 {
4158         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
4159         int i, r = LIBUSB_ERROR_NOT_FOUND;
4160         // SUB_API_MAX + 1 as the SUB_API_MAX pos is used to indicate availability of HID
4161         bool available[SUB_API_MAX + 1];
4162
4163         UNUSED(sub_api);
4164
4165         for (i = 0; i < SUB_API_MAX + 1; i++)
4166                 available[i] = false;
4167
4168         for (i = 0; i < USB_MAXINTERFACES; i++) {
4169                 switch (priv->usb_interface[i].apib->id) {
4170                 case USB_API_WINUSBX:
4171                         if (priv->usb_interface[i].sub_api != SUB_API_NOTSET)
4172                                 available[priv->usb_interface[i].sub_api] = true;
4173                         break;
4174                 case USB_API_HID:
4175                         available[SUB_API_MAX] = true;
4176                         break;
4177                 default:
4178                         break;
4179                 }
4180         }
4181
4182         for (i = 0; i < SUB_API_MAX; i++) { // WinUSB-like drivers
4183                 if (available[i]) {
4184                         r = usb_api_backend[USB_API_WINUSBX].open(i, dev_handle);
4185                         if (r != LIBUSB_SUCCESS)
4186                                 return r;
4187                 }
4188         }
4189
4190         if (available[SUB_API_MAX]) { // HID driver
4191                 r = hid_open(SUB_API_NOTSET, dev_handle);
4192
4193                 // On Windows 10 version 1903 (OS Build 18362) and later Windows blocks attempts to
4194                 // open HID devices with a U2F usage unless running as administrator. We ignore this
4195                 // failure and proceed without the HID device opened.
4196                 if (r == LIBUSB_ERROR_ACCESS) {
4197                         usbi_dbg("ignoring access denied error while opening HID interface of composite device");
4198                         r = LIBUSB_SUCCESS;
4199                 }
4200         }
4201
4202         return r;
4203 }
4204
4205 static void composite_close(int sub_api, struct libusb_device_handle *dev_handle)
4206 {
4207         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
4208         int i;
4209         // SUB_API_MAX + 1 as the SUB_API_MAX pos is used to indicate availability of HID
4210         bool available[SUB_API_MAX + 1];
4211
4212         UNUSED(sub_api);
4213
4214         for (i = 0; i < SUB_API_MAX + 1; i++)
4215                 available[i] = false;
4216
4217         for (i = 0; i < USB_MAXINTERFACES; i++) {
4218                 switch (priv->usb_interface[i].apib->id) {
4219                 case USB_API_WINUSBX:
4220                         if (priv->usb_interface[i].sub_api != SUB_API_NOTSET)
4221                                 available[priv->usb_interface[i].sub_api] = true;
4222                         break;
4223                 case USB_API_HID:
4224                         available[SUB_API_MAX] = true;
4225                         break;
4226                 default:
4227                         break;
4228                 }
4229         }
4230
4231         for (i = 0; i < SUB_API_MAX; i++) { // WinUSB-like drivers
4232                 if (available[i])
4233                         usb_api_backend[USB_API_WINUSBX].close(i, dev_handle);
4234         }
4235
4236         if (available[SUB_API_MAX]) // HID driver
4237                 hid_close(SUB_API_NOTSET, dev_handle);
4238 }
4239
4240 static int composite_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface)
4241 {
4242         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
4243
4244         UNUSED(sub_api);
4245         CHECK_SUPPORTED_API(priv->usb_interface[iface].apib, claim_interface);
4246
4247         return priv->usb_interface[iface].apib->
4248                 claim_interface(priv->usb_interface[iface].sub_api, dev_handle, iface);
4249 }
4250
4251 static int composite_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting)
4252 {
4253         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
4254
4255         UNUSED(sub_api);
4256         CHECK_SUPPORTED_API(priv->usb_interface[iface].apib, set_interface_altsetting);
4257
4258         return priv->usb_interface[iface].apib->
4259                 set_interface_altsetting(priv->usb_interface[iface].sub_api, dev_handle, iface, altsetting);
4260 }
4261
4262 static int composite_release_interface(int sub_api, struct libusb_device_handle *dev_handle, uint8_t iface)
4263 {
4264         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
4265
4266         UNUSED(sub_api);
4267         CHECK_SUPPORTED_API(priv->usb_interface[iface].apib, release_interface);
4268
4269         return priv->usb_interface[iface].apib->
4270                 release_interface(priv->usb_interface[iface].sub_api, dev_handle, iface);
4271 }
4272
4273 static int composite_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer)
4274 {
4275         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
4276         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
4277         struct libusb_config_descriptor *conf_desc;
4278         WINUSB_SETUP_PACKET *setup = (WINUSB_SETUP_PACKET *)transfer->buffer;
4279         int iface, pass, r;
4280
4281         UNUSED(sub_api);
4282
4283         // Interface shouldn't matter for control, but it does in practice, with Windows'
4284         // restrictions with regards to accessing HID keyboards and mice. Try to target
4285         // a specific interface first, if possible.
4286         switch (LIBUSB_REQ_RECIPIENT(setup->RequestType)) {
4287         case LIBUSB_RECIPIENT_INTERFACE:
4288                 iface = setup->Index & 0xFF;
4289                 break;
4290         case LIBUSB_RECIPIENT_ENDPOINT:
4291                 r = libusb_get_active_config_descriptor(transfer->dev_handle->dev, &conf_desc);
4292                 if (r == LIBUSB_SUCCESS) {
4293                         iface = get_interface_by_endpoint(conf_desc, (setup->Index & 0xFF));
4294                         libusb_free_config_descriptor(conf_desc);
4295                         break;
4296                 }
4297                 // No break if not able to determine interface
4298                 // Fall through
4299         default:
4300                 iface = -1;
4301                 break;
4302         }
4303
4304         // Try and target a specific interface if the control setup indicates such
4305         if ((iface >= 0) && (iface < USB_MAXINTERFACES)) {
4306                 usbi_dbg("attempting control transfer targeted to interface %d", iface);
4307                 if ((priv->usb_interface[iface].path != NULL)
4308                                 && (priv->usb_interface[iface].apib->submit_control_transfer != NULL)) {
4309                         r = priv->usb_interface[iface].apib->submit_control_transfer(priv->usb_interface[iface].sub_api, itransfer);
4310                         if (r == LIBUSB_SUCCESS)
4311                                 return r;
4312                 }
4313         }
4314
4315         // Either not targeted to a specific interface or no luck in doing so.
4316         // Try a 2 pass approach with all interfaces.
4317         for (pass = 0; pass < 2; pass++) {
4318                 for (iface = 0; iface < USB_MAXINTERFACES; iface++) {
4319                         if ((priv->usb_interface[iface].path != NULL)
4320                                         && (priv->usb_interface[iface].apib->submit_control_transfer != NULL)) {
4321                                 if ((pass == 0) && (priv->usb_interface[iface].restricted_functionality)) {
4322                                         usbi_dbg("trying to skip restricted interface #%d (HID keyboard or mouse?)", iface);
4323                                         continue;
4324                                 }
4325                                 usbi_dbg("using interface %d", iface);
4326                                 r = priv->usb_interface[iface].apib->submit_control_transfer(priv->usb_interface[iface].sub_api, itransfer);
4327                                 // If not supported on this API, it may be supported on another, so don't give up yet!!
4328                                 if (r == LIBUSB_ERROR_NOT_SUPPORTED)
4329                                         continue;
4330                                 return r;
4331                         }
4332                 }
4333         }
4334
4335         usbi_err(TRANSFER_CTX(transfer), "no libusb supported interfaces to complete request");
4336         return LIBUSB_ERROR_NOT_FOUND;
4337 }
4338
4339 static int composite_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer)
4340 {
4341         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
4342         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(transfer->dev_handle);
4343         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
4344         int current_interface;
4345
4346         UNUSED(sub_api);
4347
4348         current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
4349         if (current_interface < 0) {
4350                 usbi_err(TRANSFER_CTX(transfer), "unable to match endpoint to an open interface - cancelling transfer");
4351                 return LIBUSB_ERROR_NOT_FOUND;
4352         }
4353
4354         CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, submit_bulk_transfer);
4355
4356         return priv->usb_interface[current_interface].apib->
4357                 submit_bulk_transfer(priv->usb_interface[current_interface].sub_api, itransfer);
4358 }
4359
4360 static int composite_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer)
4361 {
4362         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
4363         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(transfer->dev_handle);
4364         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
4365         int current_interface;
4366
4367         UNUSED(sub_api);
4368
4369         current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint);
4370         if (current_interface < 0) {
4371                 usbi_err(TRANSFER_CTX(transfer), "unable to match endpoint to an open interface - cancelling transfer");
4372                 return LIBUSB_ERROR_NOT_FOUND;
4373         }
4374
4375         CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, submit_iso_transfer);
4376
4377         return priv->usb_interface[current_interface].apib->
4378                 submit_iso_transfer(priv->usb_interface[current_interface].sub_api, itransfer);
4379 }
4380
4381 static int composite_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint)
4382 {
4383         struct winusb_device_handle_priv *handle_priv = get_winusb_device_handle_priv(dev_handle);
4384         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
4385         int current_interface;
4386
4387         UNUSED(sub_api);
4388
4389         current_interface = interface_by_endpoint(priv, handle_priv, endpoint);
4390         if (current_interface < 0) {
4391                 usbi_err(HANDLE_CTX(dev_handle), "unable to match endpoint to an open interface - cannot clear");
4392                 return LIBUSB_ERROR_NOT_FOUND;
4393         }
4394
4395         CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, clear_halt);
4396
4397         return priv->usb_interface[current_interface].apib->
4398                 clear_halt(priv->usb_interface[current_interface].sub_api, dev_handle, endpoint);
4399 }
4400
4401 static int composite_cancel_transfer(int sub_api, struct usbi_transfer *itransfer)
4402 {
4403         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
4404         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
4405         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
4406         int current_interface = transfer_priv->interface_number;
4407
4408         UNUSED(sub_api);
4409
4410         if ((current_interface < 0) || (current_interface >= USB_MAXINTERFACES)) {
4411                 usbi_err(TRANSFER_CTX(transfer), "program assertion failed - invalid interface_number");
4412                 return LIBUSB_ERROR_NOT_FOUND;
4413         }
4414
4415         CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, cancel_transfer);
4416
4417         return priv->usb_interface[current_interface].apib->
4418                 cancel_transfer(priv->usb_interface[current_interface].sub_api, itransfer);
4419 }
4420
4421 static int composite_reset_device(int sub_api, struct libusb_device_handle *dev_handle)
4422 {
4423         struct winusb_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
4424         int i, r;
4425         bool available[SUB_API_MAX];
4426
4427         UNUSED(sub_api);
4428
4429         for (i = 0; i < SUB_API_MAX; i++)
4430                 available[i] = false;
4431
4432         for (i = 0; i < USB_MAXINTERFACES; i++) {
4433                 if ((priv->usb_interface[i].apib->id == USB_API_WINUSBX)
4434                                 && (priv->usb_interface[i].sub_api != SUB_API_NOTSET))
4435                         available[priv->usb_interface[i].sub_api] = true;
4436         }
4437
4438         for (i = 0; i < SUB_API_MAX; i++) {
4439                 if (available[i]) {
4440                         r = usb_api_backend[USB_API_WINUSBX].reset_device(i, dev_handle);
4441                         if (r != LIBUSB_SUCCESS)
4442                                 return r;
4443                 }
4444         }
4445
4446         return LIBUSB_SUCCESS;
4447 }
4448
4449 static enum libusb_transfer_status composite_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, DWORD length)
4450 {
4451         struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
4452         struct winusb_transfer_priv *transfer_priv = get_winusb_transfer_priv(itransfer);
4453         struct winusb_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
4454         int current_interface = transfer_priv->interface_number;
4455
4456         UNUSED(sub_api);
4457         if (priv->usb_interface[current_interface].apib->copy_transfer_data == NULL) {
4458                 usbi_err(TRANSFER_CTX(transfer), "program assertion failed - no function to copy transfer data");
4459                 return LIBUSB_TRANSFER_ERROR;
4460         }
4461
4462         return priv->usb_interface[current_interface].apib->
4463                 copy_transfer_data(priv->usb_interface[current_interface].sub_api, itransfer, length);
4464 }