Initial

1 files changed, 724 insertions, 0 deletions

diff --git a/src/os/windows_usbdk.c b/src/os/windows_usbdk.c
new file mode 100644
index 0000000..9f52b48
--- /dev/null
+++ b/src/os/windows_usbdk.c
@@ -0,0 +1,724 @@
+/*
+ * windows UsbDk backend for libusb 1.0
+ * Copyright © 2014 Red Hat, Inc.
+
+ * Authors:
+ * Dmitry Fleytman <dmitry@daynix.com>
+ * Pavel Gurvich <pavel@daynix.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <config.h>
+
+#include <windows.h>
+#include <stdio.h>
+
+#include "libusbi.h"
+#include "windows_usbdk.h"
+
+#if !defined(STATUS_SUCCESS)
+typedef LONG NTSTATUS;
+#define STATUS_SUCCESS			((NTSTATUS)0x00000000L)
+#endif
+
+#if !defined(STATUS_CANCELLED)
+#define STATUS_CANCELLED		((NTSTATUS)0xC0000120L)
+#endif
+
+#if !defined(STATUS_REQUEST_CANCELED)
+#define STATUS_REQUEST_CANCELED		((NTSTATUS)0xC0000703L)
+#endif
+
+static struct {
+	HMODULE module;
+
+	USBDK_GET_DEVICES_LIST			GetDevicesList;
+	USBDK_RELEASE_DEVICES_LIST		ReleaseDevicesList;
+	USBDK_START_REDIRECT			StartRedirect;
+	USBDK_STOP_REDIRECT			StopRedirect;
+	USBDK_GET_CONFIGURATION_DESCRIPTOR	GetConfigurationDescriptor;
+	USBDK_RELEASE_CONFIGURATION_DESCRIPTOR	ReleaseConfigurationDescriptor;
+	USBDK_READ_PIPE				ReadPipe;
+	USBDK_WRITE_PIPE			WritePipe;
+	USBDK_ABORT_PIPE			AbortPipe;
+	USBDK_RESET_PIPE			ResetPipe;
+	USBDK_SET_ALTSETTING			SetAltsetting;
+	USBDK_RESET_DEVICE			ResetDevice;
+	USBDK_GET_REDIRECTOR_SYSTEM_HANDLE	GetRedirectorSystemHandle;
+} usbdk_helper;
+
+static FARPROC get_usbdk_proc_addr(struct libusb_context *ctx, LPCSTR api_name)
+{
+	FARPROC api_ptr = GetProcAddress(usbdk_helper.module, api_name);
+
+	if (api_ptr == NULL)
+		usbi_err(ctx, "UsbDkHelper API %s not found: %s", api_name, windows_error_str(0));
+
+	return api_ptr;
+}
+
+static void unload_usbdk_helper_dll(void)
+{
+	if (usbdk_helper.module != NULL) {
+		FreeLibrary(usbdk_helper.module);
+		usbdk_helper.module = NULL;
+	}
+}
+
+static int load_usbdk_helper_dll(struct libusb_context *ctx)
+{
+	usbdk_helper.module = load_system_library(ctx, "UsbDkHelper");
+	if (usbdk_helper.module == NULL) {
+		usbi_err(ctx, "Failed to load UsbDkHelper.dll: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NOT_FOUND;
+	}
+
+	usbdk_helper.GetDevicesList = (USBDK_GET_DEVICES_LIST)get_usbdk_proc_addr(ctx, "UsbDk_GetDevicesList");
+	if (usbdk_helper.GetDevicesList == NULL)
+		goto error_unload;
+
+	usbdk_helper.ReleaseDevicesList = (USBDK_RELEASE_DEVICES_LIST)get_usbdk_proc_addr(ctx, "UsbDk_ReleaseDevicesList");
+	if (usbdk_helper.ReleaseDevicesList == NULL)
+		goto error_unload;
+
+	usbdk_helper.StartRedirect = (USBDK_START_REDIRECT)get_usbdk_proc_addr(ctx, "UsbDk_StartRedirect");
+	if (usbdk_helper.StartRedirect == NULL)
+		goto error_unload;
+
+	usbdk_helper.StopRedirect = (USBDK_STOP_REDIRECT)get_usbdk_proc_addr(ctx, "UsbDk_StopRedirect");
+	if (usbdk_helper.StopRedirect == NULL)
+		goto error_unload;
+
+	usbdk_helper.GetConfigurationDescriptor = (USBDK_GET_CONFIGURATION_DESCRIPTOR)get_usbdk_proc_addr(ctx, "UsbDk_GetConfigurationDescriptor");
+	if (usbdk_helper.GetConfigurationDescriptor == NULL)
+		goto error_unload;
+
+	usbdk_helper.ReleaseConfigurationDescriptor = (USBDK_RELEASE_CONFIGURATION_DESCRIPTOR)get_usbdk_proc_addr(ctx, "UsbDk_ReleaseConfigurationDescriptor");
+	if (usbdk_helper.ReleaseConfigurationDescriptor == NULL)
+		goto error_unload;
+
+	usbdk_helper.ReadPipe = (USBDK_READ_PIPE)get_usbdk_proc_addr(ctx, "UsbDk_ReadPipe");
+	if (usbdk_helper.ReadPipe == NULL)
+		goto error_unload;
+
+	usbdk_helper.WritePipe = (USBDK_WRITE_PIPE)get_usbdk_proc_addr(ctx, "UsbDk_WritePipe");
+	if (usbdk_helper.WritePipe == NULL)
+		goto error_unload;
+
+	usbdk_helper.AbortPipe = (USBDK_ABORT_PIPE)get_usbdk_proc_addr(ctx, "UsbDk_AbortPipe");
+	if (usbdk_helper.AbortPipe == NULL)
+		goto error_unload;
+
+	usbdk_helper.ResetPipe = (USBDK_RESET_PIPE)get_usbdk_proc_addr(ctx, "UsbDk_ResetPipe");
+	if (usbdk_helper.ResetPipe == NULL)
+		goto error_unload;
+
+	usbdk_helper.SetAltsetting = (USBDK_SET_ALTSETTING)get_usbdk_proc_addr(ctx, "UsbDk_SetAltsetting");
+	if (usbdk_helper.SetAltsetting == NULL)
+		goto error_unload;
+
+	usbdk_helper.ResetDevice = (USBDK_RESET_DEVICE)get_usbdk_proc_addr(ctx, "UsbDk_ResetDevice");
+	if (usbdk_helper.ResetDevice == NULL)
+		goto error_unload;
+
+	usbdk_helper.GetRedirectorSystemHandle = (USBDK_GET_REDIRECTOR_SYSTEM_HANDLE)get_usbdk_proc_addr(ctx, "UsbDk_GetRedirectorSystemHandle");
+	if (usbdk_helper.GetRedirectorSystemHandle == NULL)
+		goto error_unload;
+
+	return LIBUSB_SUCCESS;
+
+error_unload:
+	FreeLibrary(usbdk_helper.module);
+	usbdk_helper.module = NULL;
+	return LIBUSB_ERROR_NOT_FOUND;
+}
+
+typedef SC_HANDLE (WINAPI *POPENSCMANAGERA)(LPCSTR, LPCSTR, DWORD);
+typedef SC_HANDLE (WINAPI *POPENSERVICEA)(SC_HANDLE, LPCSTR, DWORD);
+typedef BOOL (WINAPI *PCLOSESERVICEHANDLE)(SC_HANDLE);
+
+static int usbdk_init(struct libusb_context *ctx)
+{
+	POPENSCMANAGERA pOpenSCManagerA;
+	POPENSERVICEA pOpenServiceA;
+	PCLOSESERVICEHANDLE pCloseServiceHandle;
+	SC_HANDLE managerHandle;
+	SC_HANDLE serviceHandle;
+	HMODULE h;
+
+	h = load_system_library(ctx, "Advapi32");
+	if (h == NULL) {
+		usbi_warn(ctx, "failed to open Advapi32\n");
+		return LIBUSB_ERROR_OTHER;
+	}
+
+	pOpenSCManagerA = (POPENSCMANAGERA)GetProcAddress(h, "OpenSCManagerA");
+	if (pOpenSCManagerA == NULL) {
+		usbi_warn(ctx, "failed to find %s in Advapi32\n", "OpenSCManagerA");
+		goto error_free_library;
+	}
+	pOpenServiceA = (POPENSERVICEA)GetProcAddress(h, "OpenServiceA");
+	if (pOpenServiceA == NULL) {
+		usbi_warn(ctx, "failed to find %s in Advapi32\n", "OpenServiceA");
+		goto error_free_library;
+	}
+	pCloseServiceHandle = (PCLOSESERVICEHANDLE)GetProcAddress(h, "CloseServiceHandle");
+	if (pCloseServiceHandle == NULL) {
+		usbi_warn(ctx, "failed to find %s in Advapi32\n", "CloseServiceHandle");
+		goto error_free_library;
+	}
+
+	managerHandle = pOpenSCManagerA(NULL, NULL, SC_MANAGER_CONNECT);
+	if (managerHandle == NULL) {
+		usbi_warn(ctx, "failed to open service control manager: %s", windows_error_str(0));
+		goto error_free_library;
+	}
+
+	serviceHandle = pOpenServiceA(managerHandle, "UsbDk", GENERIC_READ);
+	pCloseServiceHandle(managerHandle);
+
+	if (serviceHandle == NULL) {
+		if (GetLastError() != ERROR_SERVICE_DOES_NOT_EXIST)
+			usbi_warn(ctx, "failed to open UsbDk service: %s", windows_error_str(0));
+		FreeLibrary(h);
+		return LIBUSB_ERROR_NOT_FOUND;
+	}
+
+	pCloseServiceHandle(serviceHandle);
+	FreeLibrary(h);
+
+	return load_usbdk_helper_dll(ctx);
+
+error_free_library:
+	FreeLibrary(h);
+	return LIBUSB_ERROR_OTHER;
+}
+
+static void usbdk_exit(struct libusb_context *ctx)
+{
+	UNUSED(ctx);
+	unload_usbdk_helper_dll();
+}
+
+static int usbdk_get_session_id_for_device(struct libusb_context *ctx,
+	PUSB_DK_DEVICE_ID id, unsigned long *session_id)
+{
+	char dev_identity[ARRAYSIZE(id->DeviceID) + ARRAYSIZE(id->InstanceID) + 1];
+
+	if (snprintf(dev_identity, sizeof(dev_identity), "%S%S", id->DeviceID, id->InstanceID) == -1) {
+		usbi_warn(ctx, "cannot form device identity");
+		return LIBUSB_ERROR_NOT_SUPPORTED;
+	}
+
+	*session_id = htab_hash(dev_identity);
+
+	return LIBUSB_SUCCESS;
+}
+
+static void usbdk_release_config_descriptors(struct usbdk_device_priv *priv, uint8_t count)
+{
+	uint8_t i;
+
+	for (i = 0; i < count; i++)
+		usbdk_helper.ReleaseConfigurationDescriptor(priv->config_descriptors[i]);
+
+	free(priv->config_descriptors);
+	priv->config_descriptors = NULL;
+}
+
+static int usbdk_cache_config_descriptors(struct libusb_context *ctx,
+	struct usbdk_device_priv *priv, PUSB_DK_DEVICE_INFO info)
+{
+	uint8_t i;
+	USB_DK_CONFIG_DESCRIPTOR_REQUEST Request;
+	Request.ID = info->ID;
+
+	priv->config_descriptors = calloc(info->DeviceDescriptor.bNumConfigurations, sizeof(PUSB_CONFIGURATION_DESCRIPTOR));
+	if (priv->config_descriptors == NULL) {
+		usbi_err(ctx, "failed to allocate configuration descriptors holder");
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	for (i = 0; i < info->DeviceDescriptor.bNumConfigurations; i++) {
+		ULONG Length;
+
+		Request.Index = i;
+		if (!usbdk_helper.GetConfigurationDescriptor(&Request, &priv->config_descriptors[i], &Length)) {
+			usbi_err(ctx, "failed to retrieve configuration descriptors");
+			usbdk_release_config_descriptors(priv, i);
+			return LIBUSB_ERROR_OTHER;
+		}
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static inline int usbdk_device_priv_init(struct libusb_context *ctx, struct libusb_device *dev, PUSB_DK_DEVICE_INFO info)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev);
+
+	priv->ID = info->ID;
+	priv->active_configuration = 0;
+
+	return usbdk_cache_config_descriptors(ctx, priv, info);
+}
+
+static void usbdk_device_init(struct libusb_device *dev, PUSB_DK_DEVICE_INFO info)
+{
+	dev->bus_number = (uint8_t)info->FilterID;
+	dev->port_number = (uint8_t)info->Port;
+	dev->parent_dev = NULL;
+
+	// Addresses in libusb are 1-based
+	dev->device_address = (uint8_t)(info->Port + 1);
+
+	static_assert(sizeof(dev->device_descriptor) == sizeof(info->DeviceDescriptor),
+		      "mismatch between libusb and OS device descriptor sizes");
+	memcpy(&dev->device_descriptor, &info->DeviceDescriptor, LIBUSB_DT_DEVICE_SIZE);
+	usbi_localize_device_descriptor(&dev->device_descriptor);
+
+	switch (info->Speed) {
+	case LowSpeed:
+		dev->speed = LIBUSB_SPEED_LOW;
+		break;
+	case FullSpeed:
+		dev->speed = LIBUSB_SPEED_FULL;
+		break;
+	case HighSpeed:
+		dev->speed = LIBUSB_SPEED_HIGH;
+		break;
+	case SuperSpeed:
+		dev->speed = LIBUSB_SPEED_SUPER;
+		break;
+	case NoSpeed:
+	default:
+		dev->speed = LIBUSB_SPEED_UNKNOWN;
+		break;
+	}
+}
+
+static int usbdk_get_device_list(struct libusb_context *ctx, struct discovered_devs **_discdevs)
+{
+	int r = LIBUSB_SUCCESS;
+	ULONG i;
+	struct discovered_devs *discdevs = NULL;
+	ULONG dev_number;
+	PUSB_DK_DEVICE_INFO devices;
+
+	if (!usbdk_helper.GetDevicesList(&devices, &dev_number))
+		return LIBUSB_ERROR_OTHER;
+
+	for (i = 0; i < dev_number; i++) {
+		unsigned long session_id;
+		struct libusb_device *dev = NULL;
+
+		if (usbdk_get_session_id_for_device(ctx, &devices[i].ID, &session_id))
+			continue;
+
+		dev = usbi_get_device_by_session_id(ctx, session_id);
+		if (dev == NULL) {
+			dev = usbi_alloc_device(ctx, session_id);
+			if (dev == NULL) {
+				usbi_err(ctx, "failed to allocate a new device structure");
+				continue;
+			}
+
+			usbdk_device_init(dev, &devices[i]);
+			if (usbdk_device_priv_init(ctx, dev, &devices[i]) != LIBUSB_SUCCESS) {
+				libusb_unref_device(dev);
+				continue;
+			}
+		}
+
+		discdevs = discovered_devs_append(*_discdevs, dev);
+		libusb_unref_device(dev);
+		if (!discdevs) {
+			usbi_err(ctx, "cannot append new device to list");
+			r = LIBUSB_ERROR_NO_MEM;
+			goto func_exit;
+		}
+
+		*_discdevs = discdevs;
+	}
+
+func_exit:
+	usbdk_helper.ReleaseDevicesList(devices);
+	return r;
+}
+
+static int usbdk_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, void *buffer, size_t len)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev);
+	PUSB_CONFIGURATION_DESCRIPTOR config_header;
+	size_t size;
+
+	config_header = (PUSB_CONFIGURATION_DESCRIPTOR)priv->config_descriptors[config_index];
+
+	size = min(config_header->wTotalLength, len);
+	memcpy(buffer, config_header, size);
+	return (int)size;
+}
+
+static int usbdk_get_config_descriptor_by_value(struct libusb_device *dev, uint8_t bConfigurationValue,
+	void **buffer)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev);
+	PUSB_CONFIGURATION_DESCRIPTOR config_header;
+	uint8_t index;
+
+	for (index = 0; index < dev->device_descriptor.bNumConfigurations; index++) {
+		config_header = priv->config_descriptors[index];
+		if (config_header->bConfigurationValue == bConfigurationValue) {
+			*buffer = priv->config_descriptors[index];
+			return (int)config_header->wTotalLength;
+		}
+	}
+
+	return LIBUSB_ERROR_NOT_FOUND;
+}
+
+static int usbdk_get_active_config_descriptor(struct libusb_device *dev, void *buffer, size_t len)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev);
+
+	return usbdk_get_config_descriptor(dev, priv->active_configuration, buffer, len);
+}
+
+static int usbdk_open(struct libusb_device_handle *dev_handle)
+{
+	struct libusb_device *dev = dev_handle->dev;
+	struct libusb_context *ctx = DEVICE_CTX(dev);
+	struct windows_context_priv *priv = usbi_get_context_priv(ctx);
+	struct usbdk_device_priv *device_priv = usbi_get_device_priv(dev);
+
+	device_priv->redirector_handle = usbdk_helper.StartRedirect(&device_priv->ID);
+	if (device_priv->redirector_handle == INVALID_HANDLE_VALUE) {
+		usbi_err(ctx, "Redirector startup failed");
+		device_priv->redirector_handle = NULL;
+		return LIBUSB_ERROR_OTHER;
+	}
+
+	device_priv->system_handle = usbdk_helper.GetRedirectorSystemHandle(device_priv->redirector_handle);
+
+	if (CreateIoCompletionPort(device_priv->system_handle, priv->completion_port, (ULONG_PTR)dev_handle, 0) == NULL) {
+		usbi_err(ctx, "failed to associate handle to I/O completion port: %s", windows_error_str(0));
+		usbdk_helper.StopRedirect(device_priv->redirector_handle);
+		device_priv->system_handle = NULL;
+		device_priv->redirector_handle = NULL;
+		return LIBUSB_ERROR_OTHER;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static void usbdk_close(struct libusb_device_handle *dev_handle)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
+
+	if (!usbdk_helper.StopRedirect(priv->redirector_handle))
+		usbi_err(HANDLE_CTX(dev_handle), "Redirector shutdown failed");
+
+	priv->system_handle = NULL;
+	priv->redirector_handle = NULL;
+}
+
+static int usbdk_get_configuration(struct libusb_device_handle *dev_handle, uint8_t *config)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
+
+	*config = priv->active_configuration;
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_set_configuration(struct libusb_device_handle *dev_handle, uint8_t config)
+{
+	UNUSED(dev_handle);
+	UNUSED(config);
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_claim_interface(struct libusb_device_handle *dev_handle, uint8_t iface)
+{
+	UNUSED(dev_handle);
+	UNUSED(iface);
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_set_interface_altsetting(struct libusb_device_handle *dev_handle, uint8_t iface, uint8_t altsetting)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
+
+	if (!usbdk_helper.SetAltsetting(priv->redirector_handle, iface, altsetting)) {
+		usbi_err(HANDLE_CTX(dev_handle), "SetAltsetting failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NO_DEVICE;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_release_interface(struct libusb_device_handle *dev_handle, uint8_t iface)
+{
+	UNUSED(dev_handle);
+	UNUSED(iface);
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
+
+	if (!usbdk_helper.ResetPipe(priv->redirector_handle, endpoint)) {
+		usbi_err(HANDLE_CTX(dev_handle), "ResetPipe failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NO_DEVICE;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_reset_device(struct libusb_device_handle *dev_handle)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev_handle->dev);
+
+	if (!usbdk_helper.ResetDevice(priv->redirector_handle)) {
+		usbi_err(HANDLE_CTX(dev_handle), "ResetDevice failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_NO_DEVICE;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static void usbdk_destroy_device(struct libusb_device *dev)
+{
+	struct usbdk_device_priv *priv = usbi_get_device_priv(dev);
+
+	if (priv->config_descriptors != NULL)
+		usbdk_release_config_descriptors(priv, dev->device_descriptor.bNumConfigurations);
+}
+
+static void usbdk_clear_transfer_priv(struct usbi_transfer *itransfer)
+{
+	struct usbdk_transfer_priv *transfer_priv = get_usbdk_transfer_priv(itransfer);
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) {
+		safe_free(transfer_priv->IsochronousPacketsArray);
+		safe_free(transfer_priv->IsochronousResultsArray);
+	}
+}
+
+static int usbdk_do_control_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct usbdk_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
+	struct usbdk_transfer_priv *transfer_priv = get_usbdk_transfer_priv(itransfer);
+	OVERLAPPED *overlapped = get_transfer_priv_overlapped(itransfer);
+	TransferResult transResult;
+
+	transfer_priv->request.Buffer = (PVOID64)transfer->buffer;
+	transfer_priv->request.BufferLength = transfer->length;
+	transfer_priv->request.TransferType = ControlTransferType;
+
+	set_transfer_priv_handle(itransfer, priv->system_handle);
+
+	if (transfer->buffer[0] & LIBUSB_ENDPOINT_IN)
+		transResult = usbdk_helper.ReadPipe(priv->redirector_handle, &transfer_priv->request, overlapped);
+	else
+		transResult = usbdk_helper.WritePipe(priv->redirector_handle, &transfer_priv->request, overlapped);
+
+	switch (transResult) {
+	case TransferSuccess:
+		windows_force_sync_completion(itransfer, (ULONG)transfer_priv->request.Result.GenResult.BytesTransferred);
+		break;
+	case TransferSuccessAsync:
+		break;
+	case TransferFailure:
+		usbi_err(TRANSFER_CTX(transfer), "ControlTransfer failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_IO;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_do_bulk_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct usbdk_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
+	struct usbdk_transfer_priv *transfer_priv = get_usbdk_transfer_priv(itransfer);
+	OVERLAPPED *overlapped = get_transfer_priv_overlapped(itransfer);
+	TransferResult transferRes;
+
+	transfer_priv->request.Buffer = (PVOID64)transfer->buffer;
+	transfer_priv->request.BufferLength = transfer->length;
+	transfer_priv->request.EndpointAddress = transfer->endpoint;
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_BULK:
+		transfer_priv->request.TransferType = BulkTransferType;
+		break;
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+		transfer_priv->request.TransferType = InterruptTransferType;
+		break;
+	}
+
+	set_transfer_priv_handle(itransfer, priv->system_handle);
+
+	if (IS_XFERIN(transfer))
+		transferRes = usbdk_helper.ReadPipe(priv->redirector_handle, &transfer_priv->request, overlapped);
+	else
+		transferRes = usbdk_helper.WritePipe(priv->redirector_handle, &transfer_priv->request, overlapped);
+
+	switch (transferRes) {
+	case TransferSuccess:
+		windows_force_sync_completion(itransfer, (ULONG)transfer_priv->request.Result.GenResult.BytesTransferred);
+		break;
+	case TransferSuccessAsync:
+		break;
+	case TransferFailure:
+		usbi_err(TRANSFER_CTX(transfer), "ReadPipe/WritePipe failed: %s", windows_error_str(0));
+		return LIBUSB_ERROR_IO;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_do_iso_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct usbdk_device_priv *priv = usbi_get_device_priv(transfer->dev_handle->dev);
+	struct usbdk_transfer_priv *transfer_priv = get_usbdk_transfer_priv(itransfer);
+	OVERLAPPED *overlapped = get_transfer_priv_overlapped(itransfer);
+	TransferResult transferRes;
+	int i;
+
+	transfer_priv->request.Buffer = (PVOID64)transfer->buffer;
+	transfer_priv->request.BufferLength = transfer->length;
+	transfer_priv->request.EndpointAddress = transfer->endpoint;
+	transfer_priv->request.TransferType = IsochronousTransferType;
+	transfer_priv->request.IsochronousPacketsArraySize = transfer->num_iso_packets;
+	transfer_priv->IsochronousPacketsArray = malloc(transfer->num_iso_packets * sizeof(ULONG64));
+	transfer_priv->request.IsochronousPacketsArray = (PVOID64)transfer_priv->IsochronousPacketsArray;
+	if (!transfer_priv->IsochronousPacketsArray) {
+		usbi_err(TRANSFER_CTX(transfer), "Allocation of IsochronousPacketsArray failed");
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	transfer_priv->IsochronousResultsArray = malloc(transfer->num_iso_packets * sizeof(USB_DK_ISO_TRANSFER_RESULT));
+	transfer_priv->request.Result.IsochronousResultsArray = (PVOID64)transfer_priv->IsochronousResultsArray;
+	if (!transfer_priv->IsochronousResultsArray) {
+		usbi_err(TRANSFER_CTX(transfer), "Allocation of isochronousResultsArray failed");
+		return LIBUSB_ERROR_NO_MEM;
+	}
+
+	for (i = 0; i < transfer->num_iso_packets; i++)
+		transfer_priv->IsochronousPacketsArray[i] = transfer->iso_packet_desc[i].length;
+
+	set_transfer_priv_handle(itransfer, priv->system_handle);
+
+	if (IS_XFERIN(transfer))
+		transferRes = usbdk_helper.ReadPipe(priv->redirector_handle, &transfer_priv->request, overlapped);
+	else
+		transferRes = usbdk_helper.WritePipe(priv->redirector_handle, &transfer_priv->request, overlapped);
+
+	switch (transferRes) {
+	case TransferSuccess:
+		windows_force_sync_completion(itransfer, (ULONG)transfer_priv->request.Result.GenResult.BytesTransferred);
+		break;
+	case TransferSuccessAsync:
+		break;
+	case TransferFailure:
+		return LIBUSB_ERROR_IO;
+	}
+
+	return LIBUSB_SUCCESS;
+}
+
+static int usbdk_submit_transfer(struct usbi_transfer *itransfer)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+
+	switch (transfer->type) {
+	case LIBUSB_TRANSFER_TYPE_CONTROL:
+		return usbdk_do_control_transfer(itransfer);
+	case LIBUSB_TRANSFER_TYPE_BULK:
+	case LIBUSB_TRANSFER_TYPE_INTERRUPT:
+		if (IS_XFEROUT(transfer) && (transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET))
+			return LIBUSB_ERROR_NOT_SUPPORTED; //TODO: Check whether we can support this in UsbDk
+		return usbdk_do_bulk_transfer(itransfer);
+	case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
+		return usbdk_do_iso_transfer(itransfer);
+	default:
+		// Should not get here since windows_submit_transfer() validates
+		// the transfer->type field
+		usbi_err(TRANSFER_CTX(transfer), "unsupported endpoint type %d", transfer->type);
+		return LIBUSB_ERROR_NOT_SUPPORTED;
+	}
+}
+
+static enum libusb_transfer_status usbdk_copy_transfer_data(struct usbi_transfer *itransfer, DWORD length)
+{
+	struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+	struct usbdk_transfer_priv *transfer_priv = get_usbdk_transfer_priv(itransfer);
+
+	UNUSED(length);
+
+	if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) {
+		ULONG64 i;
+
+		for (i = 0; i < transfer_priv->request.IsochronousPacketsArraySize; i++) {
+			struct libusb_iso_packet_descriptor *lib_desc = &transfer->iso_packet_desc[i];
+
+			switch (transfer_priv->IsochronousResultsArray[i].TransferResult) {
+			case STATUS_SUCCESS:
+			case STATUS_CANCELLED:
+			case STATUS_REQUEST_CANCELED:
+				lib_desc->status = LIBUSB_TRANSFER_COMPLETED; // == ERROR_SUCCESS
+				break;
+			default:
+				lib_desc->status = LIBUSB_TRANSFER_ERROR; // ERROR_UNKNOWN_EXCEPTION;
+				break;
+			}
+
+			lib_desc->actual_length = (unsigned int)transfer_priv->IsochronousResultsArray[i].ActualLength;
+		}
+	}
+
+	itransfer->transferred += (int)transfer_priv->request.Result.GenResult.BytesTransferred;
+	return usbd_status_to_libusb_transfer_status((USBD_STATUS)transfer_priv->request.Result.GenResult.UsbdStatus);
+}
+
+const struct windows_backend usbdk_backend = {
+	usbdk_init,
+	usbdk_exit,
+	usbdk_get_device_list,
+	usbdk_open,
+	usbdk_close,
+	usbdk_get_active_config_descriptor,
+	usbdk_get_config_descriptor,
+	usbdk_get_config_descriptor_by_value,
+	usbdk_get_configuration,
+	usbdk_set_configuration,
+	usbdk_claim_interface,
+	usbdk_release_interface,
+	usbdk_set_interface_altsetting,
+	usbdk_clear_halt,
+	usbdk_reset_device,
+	usbdk_destroy_device,
+	usbdk_submit_transfer,
+	NULL,	/* cancel_transfer */
+	usbdk_clear_transfer_priv,
+	usbdk_copy_transfer_data,
+};