/* * windows backend for libusb 1.0 * Copyright © 2009-2012 Pete Batard * Copyright © 2016-2018 Chris Dickens * With contributions from Michael Plante, Orin Eman et al. * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer * HID Reports IOCTLs inspired from HIDAPI by Alan Ott, Signal 11 Software * Hash table functions adapted from glibc, by Ulrich Drepper et al. * Major code testing contribution by Xiaofan Chen * * 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 #include #include #include #include #include #include #include #include #include #include #include "libusbi.h" #include "windows_common.h" #include "windows_nt_common.h" #include "windows_winusb.h" #define HANDLE_VALID(h) (((h) != NULL) && ((h) != INVALID_HANDLE_VALUE)) // The 2 macros below are used in conjunction with safe loops. #define LOOP_CHECK(fcall) \ { \ r = fcall; \ if (r != LIBUSB_SUCCESS) \ continue; \ } #define LOOP_BREAK(err) \ { \ r = err; \ continue; \ } // WinUSB-like API prototypes static int winusbx_init(struct libusb_context *ctx); static void winusbx_exit(void); static int winusbx_open(int sub_api, struct libusb_device_handle *dev_handle); static void winusbx_close(int sub_api, struct libusb_device_handle *dev_handle); static int winusbx_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, int iface); static int winusbx_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface); static int winusbx_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface); static int winusbx_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer); static int winusbx_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting); static int winusbx_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer); static int winusbx_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer); static int winusbx_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint); static int winusbx_abort_transfers(int sub_api, struct usbi_transfer *itransfer); static int winusbx_abort_control(int sub_api, struct usbi_transfer *itransfer); static int winusbx_reset_device(int sub_api, struct libusb_device_handle *dev_handle); static int winusbx_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size); // HID API prototypes static int hid_init(struct libusb_context *ctx); static void hid_exit(void); static int hid_open(int sub_api, struct libusb_device_handle *dev_handle); static void hid_close(int sub_api, struct libusb_device_handle *dev_handle); static int hid_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface); static int hid_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface); static int hid_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting); static int hid_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer); static int hid_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer); static int hid_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint); static int hid_abort_transfers(int sub_api, struct usbi_transfer *itransfer); static int hid_reset_device(int sub_api, struct libusb_device_handle *dev_handle); static int hid_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size); // Composite API prototypes static int composite_open(int sub_api, struct libusb_device_handle *dev_handle); static void composite_close(int sub_api, struct libusb_device_handle *dev_handle); static int composite_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface); static int composite_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting); static int composite_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface); static int composite_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer); static int composite_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer); static int composite_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer); static int composite_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint); static int composite_abort_transfers(int sub_api, struct usbi_transfer *itransfer); static int composite_abort_control(int sub_api, struct usbi_transfer *itransfer); static int composite_reset_device(int sub_api, struct libusb_device_handle *dev_handle); static int composite_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size); static usbi_mutex_t autoclaim_lock; // API globals static HMODULE WinUSBX_handle = NULL; static struct winusb_interface WinUSBX[SUB_API_MAX]; #define CHECK_WINUSBX_AVAILABLE(sub_api) \ do { \ if (sub_api == SUB_API_NOTSET) \ sub_api = priv->sub_api; \ if (!WinUSBX[sub_api].initialized) \ return LIBUSB_ERROR_ACCESS; \ } while (0) static bool api_hid_available = false; #define CHECK_HID_AVAILABLE \ do { \ if (!api_hid_available) \ return LIBUSB_ERROR_ACCESS; \ } while (0) #if defined(ENABLE_LOGGING) static const char *guid_to_string(const GUID *guid) { static char guid_string[MAX_GUID_STRING_LENGTH]; if (guid == NULL) return ""; sprintf(guid_string, "{%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}", (unsigned int)guid->Data1, guid->Data2, guid->Data3, guid->Data4[0], guid->Data4[1], guid->Data4[2], guid->Data4[3], guid->Data4[4], guid->Data4[5], guid->Data4[6], guid->Data4[7]); return guid_string; } #endif /* * Sanitize Microsoft's paths: convert to uppercase, add prefix and fix backslashes. * Return an allocated sanitized string or NULL on error. */ static char *sanitize_path(const char *path) { const char root_prefix[] = {'\\', '\\', '.', '\\'}; size_t j, size; char *ret_path; size_t add_root = 0; if (path == NULL) return NULL; size = strlen(path) + 1; // Microsoft indiscriminately uses '\\?\', '\\.\', '##?#" or "##.#" for root prefixes. if (!((size > 3) && (((path[0] == '\\') && (path[1] == '\\') && (path[3] == '\\')) || ((path[0] == '#') && (path[1] == '#') && (path[3] == '#'))))) { add_root = sizeof(root_prefix); size += add_root; } ret_path = malloc(size); if (ret_path == NULL) return NULL; strcpy(&ret_path[add_root], path); // Ensure consistency with root prefix memcpy(ret_path, root_prefix, sizeof(root_prefix)); // Same goes for '\' and '#' after the root prefix. Ensure '#' is used for (j = sizeof(root_prefix); j < size; j++) { ret_path[j] = (char)toupper((int)ret_path[j]); // Fix case too if (ret_path[j] == '\\') ret_path[j] = '#'; } return ret_path; } /* * Cfgmgr32, AdvAPI32, OLE32 and SetupAPI DLL functions */ static BOOL init_dlls(void) { DLL_GET_HANDLE(Cfgmgr32); DLL_LOAD_FUNC(Cfgmgr32, CM_Get_Parent, TRUE); DLL_LOAD_FUNC(Cfgmgr32, CM_Get_Child, TRUE); // Prefixed to avoid conflict with header files DLL_GET_HANDLE(AdvAPI32); DLL_LOAD_FUNC_PREFIXED(AdvAPI32, p, RegQueryValueExW, TRUE); DLL_LOAD_FUNC_PREFIXED(AdvAPI32, p, RegCloseKey, TRUE); DLL_GET_HANDLE(OLE32); DLL_LOAD_FUNC_PREFIXED(OLE32, p, IIDFromString, TRUE); DLL_GET_HANDLE(SetupAPI); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiGetClassDevsA, TRUE); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiEnumDeviceInfo, TRUE); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiEnumDeviceInterfaces, TRUE); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiGetDeviceInstanceIdA, TRUE); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiGetDeviceInterfaceDetailA, TRUE); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiGetDeviceRegistryPropertyA, TRUE); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiDestroyDeviceInfoList, TRUE); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiOpenDevRegKey, TRUE); DLL_LOAD_FUNC_PREFIXED(SetupAPI, p, SetupDiOpenDeviceInterfaceRegKey, TRUE); return TRUE; } static void exit_dlls(void) { DLL_FREE_HANDLE(Cfgmgr32); DLL_FREE_HANDLE(AdvAPI32); DLL_FREE_HANDLE(OLE32); DLL_FREE_HANDLE(SetupAPI); } /* * enumerate interfaces for the whole USB class * * Parameters: * dev_info: a pointer to a dev_info list * dev_info_data: a pointer to an SP_DEVINFO_DATA to be filled (or NULL if not needed) * enumerator: the generic USB class for which to retrieve interface details * index: zero based index of the interface in the device info list * * Note: it is the responsibility of the caller to free the DEVICE_INTERFACE_DETAIL_DATA * structure returned and call this function repeatedly using the same guid (with an * incremented index starting at zero) until all interfaces have been returned. */ static bool get_devinfo_data(struct libusb_context *ctx, HDEVINFO *dev_info, SP_DEVINFO_DATA *dev_info_data, const char *enumerator, unsigned _index) { if (_index == 0) { *dev_info = pSetupDiGetClassDevsA(NULL, enumerator, NULL, DIGCF_PRESENT|DIGCF_ALLCLASSES); if (*dev_info == INVALID_HANDLE_VALUE) { usbi_err(ctx, "could not obtain device info set for PnP enumerator '%s': %s", enumerator, windows_error_str(0)); return false; } } dev_info_data->cbSize = sizeof(SP_DEVINFO_DATA); if (!pSetupDiEnumDeviceInfo(*dev_info, _index, dev_info_data)) { if (GetLastError() != ERROR_NO_MORE_ITEMS) usbi_err(ctx, "could not obtain device info data for PnP enumerator '%s' index %u: %s", enumerator, _index, windows_error_str(0)); pSetupDiDestroyDeviceInfoList(*dev_info); *dev_info = INVALID_HANDLE_VALUE; return false; } return true; } /* * enumerate interfaces for a specific GUID * * Parameters: * dev_info: a pointer to a dev_info list * dev_info_data: a pointer to an SP_DEVINFO_DATA to be filled (or NULL if not needed) * guid: the GUID for which to retrieve interface details * index: zero based index of the interface in the device info list * * Note: it is the responsibility of the caller to free the DEVICE_INTERFACE_DETAIL_DATA * structure returned and call this function repeatedly using the same guid (with an * incremented index starting at zero) until all interfaces have been returned. */ static int get_interface_details(struct libusb_context *ctx, HDEVINFO dev_info, PSP_DEVINFO_DATA dev_info_data, LPCGUID guid, DWORD *_index, char **dev_interface_path) { SP_DEVICE_INTERFACE_DATA dev_interface_data; PSP_DEVICE_INTERFACE_DETAIL_DATA_A dev_interface_details; DWORD size; dev_info_data->cbSize = sizeof(SP_DEVINFO_DATA); dev_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA); for (;;) { if (!pSetupDiEnumDeviceInfo(dev_info, *_index, dev_info_data)) { if (GetLastError() != ERROR_NO_MORE_ITEMS) { usbi_err(ctx, "Could not obtain device info data for %s index %lu: %s", guid_to_string(guid), *_index, windows_error_str(0)); return LIBUSB_ERROR_OTHER; } // No more devices return LIBUSB_SUCCESS; } // Always advance the index for the next iteration (*_index)++; if (pSetupDiEnumDeviceInterfaces(dev_info, dev_info_data, guid, 0, &dev_interface_data)) break; if (GetLastError() != ERROR_NO_MORE_ITEMS) { usbi_err(ctx, "Could not obtain interface data for %s devInst %lX: %s", guid_to_string(guid), dev_info_data->DevInst, windows_error_str(0)); return LIBUSB_ERROR_OTHER; } // Device does not have an interface matching this GUID, skip } // Read interface data (dummy + actual) to access the device path if (!pSetupDiGetDeviceInterfaceDetailA(dev_info, &dev_interface_data, NULL, 0, &size, NULL)) { // The dummy call should fail with ERROR_INSUFFICIENT_BUFFER if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) { usbi_err(ctx, "could not access interface data (dummy) for %s devInst %lX: %s", guid_to_string(guid), dev_info_data->DevInst, windows_error_str(0)); return LIBUSB_ERROR_OTHER; } } else { usbi_err(ctx, "program assertion failed - http://msdn.microsoft.com/en-us/library/ms792901.aspx is wrong"); return LIBUSB_ERROR_OTHER; } dev_interface_details = malloc(size); if (dev_interface_details == NULL) { usbi_err(ctx, "could not allocate interface data for %s devInst %lX", guid_to_string(guid), dev_info_data->DevInst); return LIBUSB_ERROR_NO_MEM; } dev_interface_details->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A); if (!pSetupDiGetDeviceInterfaceDetailA(dev_info, &dev_interface_data, dev_interface_details, size, NULL, NULL)) { usbi_err(ctx, "could not access interface data (actual) for %s devInst %lX: %s", guid_to_string(guid), dev_info_data->DevInst, windows_error_str(0)); free(dev_interface_details); return LIBUSB_ERROR_OTHER; } *dev_interface_path = sanitize_path(dev_interface_details->DevicePath); free(dev_interface_details); if (*dev_interface_path == NULL) { usbi_err(ctx, "could not allocate interface path for %s devInst %lX", guid_to_string(guid), dev_info_data->DevInst); return LIBUSB_ERROR_NO_MEM; } return LIBUSB_SUCCESS; } /* For libusb0 filter */ static SP_DEVICE_INTERFACE_DETAIL_DATA_A *get_interface_details_filter(struct libusb_context *ctx, HDEVINFO *dev_info, SP_DEVINFO_DATA *dev_info_data, const GUID *guid, unsigned _index, char *filter_path) { SP_DEVICE_INTERFACE_DATA dev_interface_data; SP_DEVICE_INTERFACE_DETAIL_DATA_A *dev_interface_details; DWORD size; if (_index == 0) *dev_info = pSetupDiGetClassDevsA(guid, NULL, NULL, DIGCF_PRESENT|DIGCF_DEVICEINTERFACE); if (dev_info_data != NULL) { dev_info_data->cbSize = sizeof(SP_DEVINFO_DATA); if (!pSetupDiEnumDeviceInfo(*dev_info, _index, dev_info_data)) { if (GetLastError() != ERROR_NO_MORE_ITEMS) usbi_err(ctx, "Could not obtain device info data for index %u: %s", _index, windows_error_str(0)); pSetupDiDestroyDeviceInfoList(*dev_info); *dev_info = INVALID_HANDLE_VALUE; return NULL; } } dev_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA); if (!pSetupDiEnumDeviceInterfaces(*dev_info, NULL, guid, _index, &dev_interface_data)) { if (GetLastError() != ERROR_NO_MORE_ITEMS) usbi_err(ctx, "Could not obtain interface data for index %u: %s", _index, windows_error_str(0)); pSetupDiDestroyDeviceInfoList(*dev_info); *dev_info = INVALID_HANDLE_VALUE; return NULL; } // Read interface data (dummy + actual) to access the device path if (!pSetupDiGetDeviceInterfaceDetailA(*dev_info, &dev_interface_data, NULL, 0, &size, NULL)) { // The dummy call should fail with ERROR_INSUFFICIENT_BUFFER if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) { usbi_err(ctx, "could not access interface data (dummy) for index %u: %s", _index, windows_error_str(0)); goto err_exit; } } else { usbi_err(ctx, "program assertion failed - http://msdn.microsoft.com/en-us/library/ms792901.aspx is wrong."); goto err_exit; } dev_interface_details = calloc(1, size); if (dev_interface_details == NULL) { usbi_err(ctx, "could not allocate interface data for index %u.", _index); goto err_exit; } dev_interface_details->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A); if (!pSetupDiGetDeviceInterfaceDetailA(*dev_info, &dev_interface_data, dev_interface_details, size, &size, NULL)) usbi_err(ctx, "could not access interface data (actual) for index %u: %s", _index, windows_error_str(0)); // [trobinso] lookup the libusb0 symbolic index. if (dev_interface_details) { HKEY hkey_device_interface = pSetupDiOpenDeviceInterfaceRegKey(*dev_info, &dev_interface_data, 0, KEY_READ); if (hkey_device_interface != INVALID_HANDLE_VALUE) { DWORD libusb0_symboliclink_index = 0; DWORD value_length = sizeof(DWORD); DWORD value_type = 0; LONG status; status = pRegQueryValueExW(hkey_device_interface, L"LUsb0", NULL, &value_type, (LPBYTE)&libusb0_symboliclink_index, &value_length); if (status == ERROR_SUCCESS) { if (libusb0_symboliclink_index < 256) { // libusb0.sys is connected to this device instance. // If the the device interface guid is {F9F3FF14-AE21-48A0-8A25-8011A7A931D9} then it's a filter. sprintf(filter_path, "\\\\.\\libusb0-%04u", (unsigned int)libusb0_symboliclink_index); usbi_dbg("assigned libusb0 symbolic link %s", filter_path); } else { // libusb0.sys was connected to this device instance at one time; but not anymore. } } pRegCloseKey(hkey_device_interface); } } return dev_interface_details; err_exit: pSetupDiDestroyDeviceInfoList(*dev_info); *dev_info = INVALID_HANDLE_VALUE; return NULL; } /* * Returns the first known ancestor of a device */ static struct libusb_device *get_ancestor(struct libusb_context *ctx, DEVINST devinst, PDEVINST _parent_devinst) { struct libusb_device *dev = NULL; DEVINST parent_devinst; while (dev == NULL) { if (CM_Get_Parent(&parent_devinst, devinst, 0) != CR_SUCCESS) break; devinst = parent_devinst; dev = usbi_get_device_by_session_id(ctx, (unsigned long)devinst); } if ((dev != NULL) && (_parent_devinst != NULL)) *_parent_devinst = devinst; return dev; } /* * Determine which interface the given endpoint address belongs to */ static int get_interface_by_endpoint(struct libusb_config_descriptor *conf_desc, uint8_t ep) { const struct libusb_interface *intf; const struct libusb_interface_descriptor *intf_desc; int i, j, k; for (i = 0; i < conf_desc->bNumInterfaces; i++) { intf = &conf_desc->interface[i]; for (j = 0; j < intf->num_altsetting; j++) { intf_desc = &intf->altsetting[j]; for (k = 0; k < intf_desc->bNumEndpoints; k++) { if (intf_desc->endpoint[k].bEndpointAddress == ep) { usbi_dbg("found endpoint %02X on interface %d", intf_desc->bInterfaceNumber, i); return intf_desc->bInterfaceNumber; } } } } usbi_dbg("endpoint %02X not found on any interface", ep); return LIBUSB_ERROR_NOT_FOUND; } /* * Populate the endpoints addresses of the device_priv interface helper structs */ static int windows_assign_endpoints(struct libusb_device_handle *dev_handle, int iface, int altsetting) { int i, r; struct winusb_device_priv *priv = _device_priv(dev_handle->dev); struct libusb_config_descriptor *conf_desc; const struct libusb_interface_descriptor *if_desc; struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); r = libusb_get_active_config_descriptor(dev_handle->dev, &conf_desc); if (r != LIBUSB_SUCCESS) { usbi_warn(ctx, "could not read config descriptor: error %d", r); return r; } if_desc = &conf_desc->interface[iface].altsetting[altsetting]; safe_free(priv->usb_interface[iface].endpoint); if (if_desc->bNumEndpoints == 0) { usbi_dbg("no endpoints found for interface %d", iface); libusb_free_config_descriptor(conf_desc); priv->usb_interface[iface].current_altsetting = altsetting; return LIBUSB_SUCCESS; } priv->usb_interface[iface].endpoint = malloc(if_desc->bNumEndpoints); if (priv->usb_interface[iface].endpoint == NULL) { libusb_free_config_descriptor(conf_desc); return LIBUSB_ERROR_NO_MEM; } priv->usb_interface[iface].nb_endpoints = if_desc->bNumEndpoints; for (i = 0; i < if_desc->bNumEndpoints; i++) { priv->usb_interface[iface].endpoint[i] = if_desc->endpoint[i].bEndpointAddress; usbi_dbg("(re)assigned endpoint %02X to interface %d", priv->usb_interface[iface].endpoint[i], iface); } libusb_free_config_descriptor(conf_desc); // Extra init may be required to configure endpoints if (priv->apib->configure_endpoints) r = priv->apib->configure_endpoints(SUB_API_NOTSET, dev_handle, iface); if (r == LIBUSB_SUCCESS) priv->usb_interface[iface].current_altsetting = altsetting; return r; } // Lookup for a match in the list of API driver names // return -1 if not found, driver match number otherwise static int get_sub_api(char *driver, int api) { int i; const char sep_str[2] = {LIST_SEPARATOR, 0}; char *tok, *tmp_str; size_t len = strlen(driver); if (len == 0) return SUB_API_NOTSET; tmp_str = _strdup(driver); if (tmp_str == NULL) return SUB_API_NOTSET; tok = strtok(tmp_str, sep_str); while (tok != NULL) { for (i = 0; i < usb_api_backend[api].nb_driver_names; i++) { if (_stricmp(tok, usb_api_backend[api].driver_name_list[i]) == 0) { free(tmp_str); return i; } } tok = strtok(NULL, sep_str); } free(tmp_str); return SUB_API_NOTSET; } /* * auto-claiming and auto-release helper functions */ static int auto_claim(struct libusb_transfer *transfer, int *interface_number, int api_type) { struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv( transfer->dev_handle); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); int current_interface = *interface_number; int r = LIBUSB_SUCCESS; switch (api_type) { case USB_API_WINUSBX: case USB_API_HID: break; default: return LIBUSB_ERROR_INVALID_PARAM; } usbi_mutex_lock(&autoclaim_lock); if (current_interface < 0) { // No serviceable interface was found for (current_interface = 0; current_interface < USB_MAXINTERFACES; current_interface++) { // Must claim an interface of the same API type if ((priv->usb_interface[current_interface].apib->id == api_type) && (libusb_claim_interface(transfer->dev_handle, current_interface) == LIBUSB_SUCCESS)) { usbi_dbg("auto-claimed interface %d for control request", current_interface); if (handle_priv->autoclaim_count[current_interface] != 0) usbi_warn(ctx, "program assertion failed - autoclaim_count was nonzero"); handle_priv->autoclaim_count[current_interface]++; break; } } if (current_interface == USB_MAXINTERFACES) { usbi_err(ctx, "could not auto-claim any interface"); r = LIBUSB_ERROR_NOT_FOUND; } } else { // If we have a valid interface that was autoclaimed, we must increment // its autoclaim count so that we can prevent an early release. if (handle_priv->autoclaim_count[current_interface] != 0) handle_priv->autoclaim_count[current_interface]++; } usbi_mutex_unlock(&autoclaim_lock); *interface_number = current_interface; return r; } static void auto_release(struct usbi_transfer *itransfer) { struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); libusb_device_handle *dev_handle = transfer->dev_handle; struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); int r; usbi_mutex_lock(&autoclaim_lock); if (handle_priv->autoclaim_count[transfer_priv->interface_number] > 0) { handle_priv->autoclaim_count[transfer_priv->interface_number]--; if (handle_priv->autoclaim_count[transfer_priv->interface_number] == 0) { r = libusb_release_interface(dev_handle, transfer_priv->interface_number); if (r == LIBUSB_SUCCESS) usbi_dbg("auto-released interface %d", transfer_priv->interface_number); else usbi_dbg("failed to auto-release interface %d (%s)", transfer_priv->interface_number, libusb_error_name((enum libusb_error)r)); } } usbi_mutex_unlock(&autoclaim_lock); } /* * init: libusb backend init function */ static int winusb_init(struct libusb_context *ctx) { int i; // We need a lock for proper auto-release usbi_mutex_init(&autoclaim_lock); // Load DLL imports if (!init_dlls()) { usbi_err(ctx, "could not resolve DLL functions"); return LIBUSB_ERROR_OTHER; } // Initialize the low level APIs (we don't care about errors at this stage) for (i = 0; i < USB_API_MAX; i++) { if (usb_api_backend[i].init && usb_api_backend[i].init(ctx)) usbi_warn(ctx, "error initializing %s backend", usb_api_backend[i].designation); } return LIBUSB_SUCCESS; } /* * exit: libusb backend deinitialization function */ static void winusb_exit(struct libusb_context *ctx) { int i; for (i = 0; i < USB_API_MAX; i++) { if (usb_api_backend[i].exit) usb_api_backend[i].exit(); } exit_dlls(); usbi_mutex_destroy(&autoclaim_lock); } /* * fetch and cache all the config descriptors through I/O */ static void cache_config_descriptors(struct libusb_device *dev, HANDLE hub_handle) { struct libusb_context *ctx = DEVICE_CTX(dev); struct winusb_device_priv *priv = _device_priv(dev); DWORD size, ret_size; uint8_t i; USB_CONFIGURATION_DESCRIPTOR_SHORT cd_buf_short; // dummy request PUSB_DESCRIPTOR_REQUEST cd_buf_actual = NULL; // actual request PUSB_CONFIGURATION_DESCRIPTOR cd_data; if (dev->num_configurations == 0) return; priv->config_descriptor = calloc(dev->num_configurations, sizeof(PUSB_CONFIGURATION_DESCRIPTOR)); if (priv->config_descriptor == NULL) { usbi_err(ctx, "could not allocate configuration descriptor array for '%s'", priv->dev_id); return; } for (i = 0; i <= dev->num_configurations; i++) { safe_free(cd_buf_actual); if (i == dev->num_configurations) break; size = sizeof(cd_buf_short); memset(&cd_buf_short, 0, size); cd_buf_short.req.ConnectionIndex = (ULONG)dev->port_number; cd_buf_short.req.SetupPacket.bmRequest = LIBUSB_ENDPOINT_IN; cd_buf_short.req.SetupPacket.bRequest = LIBUSB_REQUEST_GET_DESCRIPTOR; cd_buf_short.req.SetupPacket.wValue = (LIBUSB_DT_CONFIG << 8) | i; cd_buf_short.req.SetupPacket.wIndex = 0; cd_buf_short.req.SetupPacket.wLength = (USHORT)sizeof(USB_CONFIGURATION_DESCRIPTOR); // Dummy call to get the required data size. Initial failures are reported as info rather // than error as they can occur for non-penalizing situations, such as with some hubs. // coverity[tainted_data_argument] if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION, &cd_buf_short, size, &cd_buf_short, size, &ret_size, NULL)) { usbi_info(ctx, "could not access configuration descriptor %u (dummy) for '%s': %s", i, priv->dev_id, windows_error_str(0)); continue; } if ((ret_size != size) || (cd_buf_short.desc.wTotalLength < sizeof(USB_CONFIGURATION_DESCRIPTOR))) { usbi_info(ctx, "unexpected configuration descriptor %u size (dummy) for '%s'", i, priv->dev_id); continue; } size = sizeof(USB_DESCRIPTOR_REQUEST) + cd_buf_short.desc.wTotalLength; cd_buf_actual = malloc(size); if (cd_buf_actual == NULL) { usbi_err(ctx, "could not allocate configuration descriptor %u buffer for '%s'", i, priv->dev_id); continue; } // Actual call cd_buf_actual->ConnectionIndex = (ULONG)dev->port_number; cd_buf_actual->SetupPacket.bmRequest = LIBUSB_ENDPOINT_IN; cd_buf_actual->SetupPacket.bRequest = LIBUSB_REQUEST_GET_DESCRIPTOR; cd_buf_actual->SetupPacket.wValue = (LIBUSB_DT_CONFIG << 8) | i; cd_buf_actual->SetupPacket.wIndex = 0; cd_buf_actual->SetupPacket.wLength = cd_buf_short.desc.wTotalLength; if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_DESCRIPTOR_FROM_NODE_CONNECTION, cd_buf_actual, size, cd_buf_actual, size, &ret_size, NULL)) { usbi_err(ctx, "could not access configuration descriptor %u (actual) for '%s': %s", i, priv->dev_id, windows_error_str(0)); continue; } cd_data = (PUSB_CONFIGURATION_DESCRIPTOR)((UCHAR *)cd_buf_actual + sizeof(USB_DESCRIPTOR_REQUEST)); if ((size != ret_size) || (cd_data->wTotalLength != cd_buf_short.desc.wTotalLength)) { usbi_err(ctx, "unexpected configuration descriptor %u size (actual) for '%s'", i, priv->dev_id); continue; } if (cd_data->bDescriptorType != LIBUSB_DT_CONFIG) { usbi_err(ctx, "descriptor %u not a configuration descriptor for '%s'", i, priv->dev_id); continue; } usbi_dbg("cached config descriptor %u (bConfigurationValue=%u, %u bytes)", i, cd_data->bConfigurationValue, cd_data->wTotalLength); // Cache the descriptor priv->config_descriptor[i] = malloc(cd_data->wTotalLength); if (priv->config_descriptor[i] != NULL) { memcpy(priv->config_descriptor[i], cd_data, cd_data->wTotalLength); } else { usbi_err(ctx, "could not allocate configuration descriptor %u buffer for '%s'", i, priv->dev_id); } } } /* * Populate a libusb device structure */ static int init_device(struct libusb_device *dev, struct libusb_device *parent_dev, uint8_t port_number, DEVINST devinst) { struct libusb_context *ctx; struct libusb_device *tmp_dev; struct winusb_device_priv *priv, *parent_priv; USB_NODE_CONNECTION_INFORMATION_EX conn_info; USB_NODE_CONNECTION_INFORMATION_EX_V2 conn_info_v2; HANDLE hub_handle; DWORD size; uint8_t bus_number, depth; int r; int ginfotimeout; priv = _device_priv(dev); // If the device is already initialized, we can stop here if (priv->initialized) return LIBUSB_SUCCESS; if (parent_dev != NULL) { // Not a HCD root hub ctx = DEVICE_CTX(dev); parent_priv = _device_priv(parent_dev); if (parent_priv->apib->id != USB_API_HUB) { usbi_warn(ctx, "parent for device '%s' is not a hub", priv->dev_id); return LIBUSB_ERROR_NOT_FOUND; } // Calculate depth and fetch bus number bus_number = parent_dev->bus_number; if (bus_number == 0) { tmp_dev = get_ancestor(ctx, devinst, &devinst); if (tmp_dev != parent_dev) { usbi_err(ctx, "program assertion failed - first ancestor is not parent"); return LIBUSB_ERROR_NOT_FOUND; } libusb_unref_device(tmp_dev); for (depth = 1; bus_number == 0; depth++) { tmp_dev = get_ancestor(ctx, devinst, &devinst); if (tmp_dev->bus_number != 0) { bus_number = tmp_dev->bus_number; depth += _device_priv(tmp_dev)->depth; } libusb_unref_device(tmp_dev); } } else { depth = parent_priv->depth + 1; } if (bus_number == 0) { usbi_err(ctx, "program assertion failed - bus number not found for '%s'", priv->dev_id); return LIBUSB_ERROR_NOT_FOUND; } dev->bus_number = bus_number; dev->port_number = port_number; dev->parent_dev = parent_dev; priv->depth = depth; hub_handle = CreateFileA(parent_priv->path, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL); if (hub_handle == INVALID_HANDLE_VALUE) { usbi_warn(ctx, "could not open hub %s: %s", parent_priv->path, windows_error_str(0)); return LIBUSB_ERROR_ACCESS; } memset(&conn_info, 0, sizeof(conn_info)); conn_info.ConnectionIndex = (ULONG)port_number; // coverity[tainted_data_argument] ginfotimeout = 20; do { if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX, &conn_info, sizeof(conn_info), &conn_info, sizeof(conn_info), &size, NULL)) { usbi_warn(ctx, "could not get node connection information for device '%s': %s", priv->dev_id, windows_error_str(0)); CloseHandle(hub_handle); return LIBUSB_ERROR_NO_DEVICE; } if (conn_info.ConnectionStatus == NoDeviceConnected) { usbi_err(ctx, "device '%s' is no longer connected!", priv->dev_id); CloseHandle(hub_handle); return LIBUSB_ERROR_NO_DEVICE; } memcpy(&priv->dev_descriptor, &(conn_info.DeviceDescriptor), sizeof(USB_DEVICE_DESCRIPTOR)); dev->num_configurations = priv->dev_descriptor.bNumConfigurations; priv->active_config = conn_info.CurrentConfigurationValue; if (priv->active_config == 0) { usbi_dbg("0x%x:0x%x found %u configurations (active conf: %u) \n", priv->dev_descriptor.idVendor, priv->dev_descriptor.idProduct, dev->num_configurations, priv->active_config); } if (priv->active_config == 0) Sleep(50); } while (priv->active_config == 0 && --ginfotimeout >= 0); if (priv->active_config == 0) { usbi_dbg("after try 0x%x:0x%x found %u configurations (active conf: %u) \n", priv->dev_descriptor.idVendor, priv->dev_descriptor.idProduct, dev->num_configurations, priv->active_config); usbi_dbg("Force this device active config to 1 in libusb! \nNOTICE: Should not reach this place!!!!!! \n"); priv->active_config = 1; } usbi_dbg("found %u configurations (active conf: %u)", dev->num_configurations, priv->active_config); // Cache as many config descriptors as we can cache_config_descriptors(dev, hub_handle); // In their great wisdom, Microsoft decided to BREAK the USB speed report between Windows 7 and Windows 8 if (windows_version >= WINDOWS_8) { conn_info_v2.ConnectionIndex = (ULONG)port_number; conn_info_v2.Length = sizeof(USB_NODE_CONNECTION_INFORMATION_EX_V2); conn_info_v2.SupportedUsbProtocols.Usb300 = 1; if (!DeviceIoControl(hub_handle, IOCTL_USB_GET_NODE_CONNECTION_INFORMATION_EX_V2, &conn_info_v2, sizeof(conn_info_v2), &conn_info_v2, sizeof(conn_info_v2), &size, NULL)) { usbi_warn(ctx, "could not get node connection information (V2) for device '%s': %s", priv->dev_id, windows_error_str(0)); } else if (conn_info_v2.Flags.DeviceIsOperatingAtSuperSpeedOrHigher) { conn_info.Speed = 3; } } CloseHandle(hub_handle); if (conn_info.DeviceAddress > UINT8_MAX) usbi_err(ctx, "program assertion failed - device address overflow"); dev->device_address = (uint8_t)conn_info.DeviceAddress; switch (conn_info.Speed) { case 0: dev->speed = LIBUSB_SPEED_LOW; break; case 1: dev->speed = LIBUSB_SPEED_FULL; break; case 2: dev->speed = LIBUSB_SPEED_HIGH; break; case 3: dev->speed = LIBUSB_SPEED_SUPER; break; default: usbi_warn(ctx, "unknown device speed %u", conn_info.Speed); break; } } r = usbi_sanitize_device(dev); if (r) return r; priv->initialized = true; usbi_dbg("(bus: %u, addr: %u, depth: %u, port: %u): '%s'", dev->bus_number, dev->device_address, priv->depth, dev->port_number, priv->dev_id); return LIBUSB_SUCCESS; } static int enumerate_hcd_root_hub(struct libusb_context *ctx, const char *dev_id, uint8_t bus_number, DEVINST devinst) { struct libusb_device *dev; struct winusb_device_priv *priv; unsigned long session_id; DEVINST child_devinst; if (CM_Get_Child(&child_devinst, devinst, 0) != CR_SUCCESS) { usbi_err(ctx, "could not get child devinst for '%s'", dev_id); return LIBUSB_ERROR_OTHER; } session_id = (unsigned long)child_devinst; dev = usbi_get_device_by_session_id(ctx, session_id); if (dev == NULL) { usbi_err(ctx, "program assertion failed - HCD '%s' child not found", dev_id); return LIBUSB_ERROR_NO_DEVICE; } if (dev->bus_number == 0) { // Only do this once usbi_dbg("assigning HCD '%s' bus number %u", dev_id, bus_number); priv = _device_priv(dev); dev->bus_number = bus_number; dev->num_configurations = 1; priv->dev_descriptor.bLength = LIBUSB_DT_DEVICE_SIZE; priv->dev_descriptor.bDescriptorType = LIBUSB_DT_DEVICE; priv->dev_descriptor.bDeviceClass = LIBUSB_CLASS_HUB; priv->dev_descriptor.bNumConfigurations = 1; priv->active_config = 1; priv->root_hub = true; if (sscanf(dev_id, "PCI\\VEN_%04hx&DEV_%04hx%*s", &priv->dev_descriptor.idVendor, &priv->dev_descriptor.idProduct) != 2) { usbi_warn(ctx, "could not infer VID/PID of HCD root hub from '%s'", dev_id); priv->dev_descriptor.idVendor = 0x1d6b; // Linux Foundation root hub priv->dev_descriptor.idProduct = 1; } } libusb_unref_device(dev); return LIBUSB_SUCCESS; } // Returns the api type, or 0 if not found/unsupported static void get_api_type(struct libusb_context *ctx, HDEVINFO *dev_info, SP_DEVINFO_DATA *dev_info_data, int *api, int *sub_api) { // Precedence for filter drivers vs driver is in the order of this array struct driver_lookup lookup[3] = { {"\0\0", SPDRP_SERVICE, "driver"}, {"\0\0", SPDRP_UPPERFILTERS, "upper filter driver"}, {"\0\0", SPDRP_LOWERFILTERS, "lower filter driver"} }; DWORD size, reg_type; unsigned k, l; int i, j; // Check the service & filter names to know the API we should use for (k = 0; k < 3; k++) { if (pSetupDiGetDeviceRegistryPropertyA(*dev_info, dev_info_data, lookup[k].reg_prop, ®_type, (PBYTE)lookup[k].list, MAX_KEY_LENGTH, &size)) { // Turn the REG_SZ SPDRP_SERVICE into REG_MULTI_SZ if (lookup[k].reg_prop == SPDRP_SERVICE) // our buffers are MAX_KEY_LENGTH + 1 so we can overflow if needed lookup[k].list[strlen(lookup[k].list) + 1] = 0; // MULTI_SZ is a pain to work with. Turn it into something much more manageable // NB: none of the driver names we check against contain LIST_SEPARATOR, // (currently ';'), so even if an unsuported one does, it's not an issue for (l = 0; (lookup[k].list[l] != 0) || (lookup[k].list[l + 1] != 0); l++) { if (lookup[k].list[l] == 0) lookup[k].list[l] = LIST_SEPARATOR; } usbi_dbg("%s(s): %s", lookup[k].designation, lookup[k].list); } else { if (GetLastError() != ERROR_INVALID_DATA) usbi_dbg("could not access %s: %s", lookup[k].designation, windows_error_str(0)); lookup[k].list[0] = 0; } } for (i = 2; i < USB_API_MAX; i++) { for (k = 0; k < 3; k++) { j = get_sub_api(lookup[k].list, i); if (j >= 0) { usbi_dbg("matched %s name against %s", lookup[k].designation, (i != USB_API_WINUSBX) ? usb_api_backend[i].designation : usb_api_backend[i].driver_name_list[j]); *api = i; *sub_api = j; return; } } } } static int set_composite_interface(struct libusb_context *ctx, struct libusb_device *dev, char *dev_interface_path, char *device_id, int api, int sub_api) { struct winusb_device_priv *priv = _device_priv(dev); int interface_number; const char *mi_str; // Because MI_## are not necessarily in sequential order (some composite // devices will have only MI_00 & MI_03 for instance), we retrieve the actual // interface number from the path's MI value mi_str = strstr(device_id, "MI_"); if ((mi_str != NULL) && isdigit(mi_str[3]) && isdigit(mi_str[4])) { interface_number = ((mi_str[3] - '0') * 10) + (mi_str[4] - '0'); } else { usbi_warn(ctx, "failure to read interface number for %s, using default value", device_id); interface_number = 0; } if (interface_number >= USB_MAXINTERFACES) { usbi_warn(ctx, "interface %d too large - ignoring interface path %s", interface_number, dev_interface_path); return LIBUSB_ERROR_ACCESS; } if (priv->usb_interface[interface_number].path != NULL) { if (api == USB_API_HID) { // HID devices can have multiple collections (COL##) for each MI_## interface usbi_dbg("interface[%d] already set - ignoring HID collection: %s", interface_number, device_id); return LIBUSB_ERROR_ACCESS; } // In other cases, just use the latest data safe_free(priv->usb_interface[interface_number].path); } usbi_dbg("interface[%d] = %s", interface_number, dev_interface_path); priv->usb_interface[interface_number].path = dev_interface_path; priv->usb_interface[interface_number].apib = &usb_api_backend[api]; priv->usb_interface[interface_number].sub_api = sub_api; if ((api == USB_API_HID) && (priv->hid == NULL)) { priv->hid = calloc(1, sizeof(struct hid_device_priv)); if (priv->hid == NULL) return LIBUSB_ERROR_NO_MEM; } return LIBUSB_SUCCESS; } static int set_hid_interface(struct libusb_context *ctx, struct libusb_device *dev, char *dev_interface_path) { int i; struct winusb_device_priv *priv = _device_priv(dev); if (priv->hid == NULL) { usbi_err(ctx, "program assertion failed: parent is not HID"); return LIBUSB_ERROR_NO_DEVICE; } else if (priv->hid->nb_interfaces == USB_MAXINTERFACES) { usbi_err(ctx, "program assertion failed: max USB interfaces reached for HID device"); return LIBUSB_ERROR_NO_DEVICE; } for (i = 0; i < priv->hid->nb_interfaces; i++) { if ((priv->usb_interface[i].path != NULL) && strcmp(priv->usb_interface[i].path, dev_interface_path) == 0) { usbi_dbg("interface[%d] already set to %s", i, dev_interface_path); return LIBUSB_ERROR_ACCESS; } } priv->usb_interface[priv->hid->nb_interfaces].path = dev_interface_path; priv->usb_interface[priv->hid->nb_interfaces].apib = &usb_api_backend[USB_API_HID]; usbi_dbg("interface[%u] = %s", priv->hid->nb_interfaces, dev_interface_path); priv->hid->nb_interfaces++; return LIBUSB_SUCCESS; } /* * get_device_list: libusb backend device enumeration function */ static int winusb_get_device_list(struct libusb_context *ctx, struct discovered_devs **_discdevs) { struct discovered_devs *discdevs; HDEVINFO *dev_info, dev_info_intf, dev_info_enum; SP_DEVINFO_DATA dev_info_data; DWORD _index = 0; GUID hid_guid; int r = LIBUSB_SUCCESS; int api, sub_api; unsigned int pass, i, j; char enumerator[16]; char dev_id[MAX_PATH_LENGTH]; struct libusb_device *dev, *parent_dev; struct winusb_device_priv *priv, *parent_priv; char *dev_interface_path = NULL; unsigned long session_id; DWORD size, port_nr, reg_type, install_state; HKEY key; WCHAR guid_string_w[MAX_GUID_STRING_LENGTH]; GUID *if_guid; LONG s; #define HUB_PASS 0 #define DEV_PASS 1 #define HCD_PASS 2 #define GEN_PASS 3 #define HID_PASS 4 #define EXT_PASS 5 // Keep a list of guids that will be enumerated #define GUID_SIZE_STEP 8 const GUID **guid_list, **new_guid_list; unsigned int guid_size = GUID_SIZE_STEP; unsigned int nb_guids; // Keep a list of PnP enumerator strings that are found char *usb_enumerator[8] = { "USB" }; unsigned int nb_usb_enumerators = 1; unsigned int usb_enum_index = 0; // Keep a list of newly allocated devs to unref #define UNREF_SIZE_STEP 16 libusb_device **unref_list, **new_unref_list; unsigned int unref_size = UNREF_SIZE_STEP; unsigned int unref_cur = 0; // PASS 1 : (re)enumerate HCDs (allows for HCD hotplug) // PASS 2 : (re)enumerate HUBS // PASS 3 : (re)enumerate generic USB devices (including driverless) // and list additional USB device interface GUIDs to explore // PASS 4 : (re)enumerate master USB devices that have a device interface // PASS 5+: (re)enumerate device interfaced GUIDs (including HID) and // set the device interfaces. // Init the GUID table guid_list = malloc(guid_size * sizeof(void *)); if (guid_list == NULL) { usbi_err(ctx, "failed to alloc guid list"); return LIBUSB_ERROR_NO_MEM; } guid_list[HUB_PASS] = &GUID_DEVINTERFACE_USB_HUB; guid_list[DEV_PASS] = &GUID_DEVINTERFACE_USB_DEVICE; guid_list[HCD_PASS] = &GUID_DEVINTERFACE_USB_HOST_CONTROLLER; guid_list[GEN_PASS] = NULL; if (api_hid_available) { HidD_GetHidGuid(&hid_guid); guid_list[HID_PASS] = &hid_guid; } else { guid_list[HID_PASS] = NULL; } nb_guids = EXT_PASS; unref_list = malloc(unref_size * sizeof(void *)); if (unref_list == NULL) { usbi_err(ctx, "failed to alloc unref list"); free((void *)guid_list); return LIBUSB_ERROR_NO_MEM; } dev_info_intf = pSetupDiGetClassDevsA(NULL, NULL, NULL, DIGCF_ALLCLASSES | DIGCF_PRESENT | DIGCF_DEVICEINTERFACE); if (dev_info_intf == INVALID_HANDLE_VALUE) { usbi_err(ctx, "failed to obtain device info list: %s", windows_error_str(0)); free(unref_list); free((void *)guid_list); return LIBUSB_ERROR_OTHER; } for (pass = 0; ((pass < nb_guids) && (r == LIBUSB_SUCCESS)); pass++) { //#define ENUM_DEBUG #if defined(ENABLE_LOGGING) && defined(ENUM_DEBUG) const char * const passname[] = {"HUB", "DEV", "HCD", "GEN", "HID", "EXT"}; usbi_dbg("#### PROCESSING %ss %s", passname[MIN(pass, EXT_PASS)], guid_to_string(guid_list[pass])); #endif if ((pass == HID_PASS) && (guid_list[HID_PASS] == NULL)) continue; dev_info = (pass != GEN_PASS) ? &dev_info_intf : &dev_info_enum; for (i = 0; ; i++) { // safe loop: free up any (unprotected) dynamic resource // NB: this is always executed before breaking the loop safe_free(dev_interface_path); priv = parent_priv = NULL; dev = parent_dev = NULL; // Safe loop: end of loop conditions if (r != LIBUSB_SUCCESS) break; if ((pass == HCD_PASS) && (i == UINT8_MAX)) { usbi_warn(ctx, "program assertion failed - found more than %u buses, skipping the rest.", UINT8_MAX); break; } if (pass != GEN_PASS) { // Except for GEN, all passes deal with device interfaces r = get_interface_details(ctx, *dev_info, &dev_info_data, guid_list[pass], &_index, &dev_interface_path); if ((r != LIBUSB_SUCCESS) || (dev_interface_path == NULL)) { _index = 0; break; } } else { // Workaround for a Nec/Renesas USB 3.0 driver bug where root hubs are // being listed under the "NUSB3" PnP Symbolic Name rather than "USB". // The Intel USB 3.0 driver behaves similar, but uses "IUSB3" // The Intel Alpine Ridge USB 3.1 driver uses "IARUSB3" for (; usb_enum_index < nb_usb_enumerators; usb_enum_index++) { if (get_devinfo_data(ctx, dev_info, &dev_info_data, usb_enumerator[usb_enum_index], i)) break; i = 0; } if (usb_enum_index == nb_usb_enumerators) break; } // Read the Device ID path if (!pSetupDiGetDeviceInstanceIdA(*dev_info, &dev_info_data, dev_id, sizeof(dev_id), NULL)) { usbi_warn(ctx, "could not read the device instance ID for devInst %lX, skipping", dev_info_data.DevInst); continue; } #ifdef ENUM_DEBUG usbi_dbg("PRO: %s", dev_id); #endif // Set API to use or get additional data from generic pass api = USB_API_UNSUPPORTED; sub_api = SUB_API_NOTSET; switch (pass) { case HCD_PASS: break; case HUB_PASS: api = USB_API_HUB; // Fetch the PnP enumerator class for this hub // This will allow us to enumerate all classes during the GEN pass if (!pSetupDiGetDeviceRegistryPropertyA(*dev_info, &dev_info_data, SPDRP_ENUMERATOR_NAME, NULL, (PBYTE)enumerator, sizeof(enumerator), NULL)) { usbi_err(ctx, "could not read enumerator string for device '%s': %s", dev_id, windows_error_str(0)); LOOP_BREAK(LIBUSB_ERROR_OTHER); } for (j = 0; j < nb_usb_enumerators; j++) { if (strcmp(usb_enumerator[j], enumerator) == 0) break; } if (j == nb_usb_enumerators) { usbi_dbg("found new PnP enumerator string '%s'", enumerator); if (nb_usb_enumerators < ARRAYSIZE(usb_enumerator)) { usb_enumerator[nb_usb_enumerators] = _strdup(enumerator); if (usb_enumerator[nb_usb_enumerators] != NULL) { nb_usb_enumerators++; } else { usbi_err(ctx, "could not allocate enumerator string '%s'", enumerator); LOOP_BREAK(LIBUSB_ERROR_NO_MEM); } } else { usbi_warn(ctx, "too many enumerator strings, some devices may not be accessible"); } } break; case GEN_PASS: // We use the GEN pass to detect driverless devices... if (!pSetupDiGetDeviceRegistryPropertyA(*dev_info, &dev_info_data, SPDRP_DRIVER, NULL, NULL, 0, NULL) && (GetLastError() != ERROR_INSUFFICIENT_BUFFER)) { usbi_info(ctx, "The following device has no driver: '%s'", dev_id); usbi_info(ctx, "libusb will not be able to access it"); } // ...and to add the additional device interface GUIDs key = pSetupDiOpenDevRegKey(*dev_info, &dev_info_data, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_READ); if (key == INVALID_HANDLE_VALUE) break; // Look for both DeviceInterfaceGUIDs *and* DeviceInterfaceGUID, in that order size = sizeof(guid_string_w); s = pRegQueryValueExW(key, L"DeviceInterfaceGUIDs", NULL, ®_type, (LPBYTE)guid_string_w, &size); if (s == ERROR_FILE_NOT_FOUND) s = pRegQueryValueExW(key, L"DeviceInterfaceGUID", NULL, ®_type, (LPBYTE)guid_string_w, &size); pRegCloseKey(key); if ((s == ERROR_SUCCESS) && (((reg_type == REG_SZ) && (size == (sizeof(guid_string_w) - sizeof(WCHAR)))) || ((reg_type == REG_MULTI_SZ) && (size == sizeof(guid_string_w))))) { if (nb_guids == guid_size) { new_guid_list = realloc((void *)guid_list, (guid_size + GUID_SIZE_STEP) * sizeof(void *)); if (new_guid_list == NULL) { usbi_err(ctx, "failed to realloc guid list"); LOOP_BREAK(LIBUSB_ERROR_NO_MEM); } guid_list = new_guid_list; guid_size += GUID_SIZE_STEP; } if_guid = malloc(sizeof(*if_guid)); if (if_guid == NULL) { usbi_err(ctx, "failed to alloc if_guid"); LOOP_BREAK(LIBUSB_ERROR_NO_MEM); } if (pIIDFromString(guid_string_w, if_guid) != 0) { usbi_warn(ctx, "device '%s' has malformed DeviceInterfaceGUID string, skipping", dev_id); free(if_guid); } else { // Check if we've already seen this GUID for (j = EXT_PASS; j < nb_guids; j++) { if (memcmp(guid_list[j], if_guid, sizeof(*if_guid)) == 0) break; } if (j == nb_guids) { usbi_dbg("extra GUID: %s", guid_to_string(if_guid)); guid_list[nb_guids++] = if_guid; } else { // Duplicate, ignore free(if_guid); } } } else if (s == ERROR_SUCCESS) { usbi_warn(ctx, "unexpected type/size of DeviceInterfaceGUID for '%s'", dev_id); } break; case HID_PASS: api = USB_API_HID; break; default: // Get the API type (after checking that the driver installation is OK) if ((!pSetupDiGetDeviceRegistryPropertyA(*dev_info, &dev_info_data, SPDRP_INSTALL_STATE, NULL, (PBYTE)&install_state, sizeof(install_state), &size)) || (size != sizeof(install_state))) { usbi_warn(ctx, "could not detect installation state of driver for '%s': %s", dev_id, windows_error_str(0)); } else if (install_state != 0) { usbi_warn(ctx, "driver for device '%s' is reporting an issue (code: %u) - skipping", dev_id, (unsigned int)install_state); continue; } get_api_type(ctx, dev_info, &dev_info_data, &api, &sub_api); break; } // Find parent device (for the passes that need it) if (pass >= GEN_PASS) { parent_dev = get_ancestor(ctx, dev_info_data.DevInst, NULL); if (parent_dev == NULL) { // Root hubs will not have a parent dev = usbi_get_device_by_session_id(ctx, (unsigned long)dev_info_data.DevInst); if (dev != NULL) { priv = _device_priv(dev); if (priv->root_hub) goto track_unref; libusb_unref_device(dev); } usbi_dbg("unlisted ancestor for '%s' (non USB HID, newly connected, etc.) - ignoring", dev_id); continue; } parent_priv = _device_priv(parent_dev); // virtual USB devices are also listed during GEN - don't process these yet if ((pass == GEN_PASS) && (parent_priv->apib->id != USB_API_HUB)) { libusb_unref_device(parent_dev); continue; } } // Create new or match existing device, using the devInst as session id if ((pass <= GEN_PASS) && (pass != HCD_PASS)) { // For subsequent passes, we'll lookup the parent // These are the passes that create "new" devices session_id = (unsigned long)dev_info_data.DevInst; dev = usbi_get_device_by_session_id(ctx, session_id); if (dev == NULL) { alloc_device: usbi_dbg("allocating new device for session [%lX]", session_id); dev = usbi_alloc_device(ctx, session_id); if (dev == NULL) LOOP_BREAK(LIBUSB_ERROR_NO_MEM); priv = winusb_device_priv_init(dev); priv->dev_id = _strdup(dev_id); if (priv->dev_id == NULL) { libusb_unref_device(dev); LOOP_BREAK(LIBUSB_ERROR_NO_MEM); } } else { usbi_dbg("found existing device for session [%lX]", session_id); priv = _device_priv(dev); if (strcmp(priv->dev_id, dev_id) != 0) { usbi_dbg("device instance ID for session [%lX] changed", session_id); usbi_disconnect_device(dev); libusb_unref_device(dev); goto alloc_device; } } track_unref: // Keep track of devices that need unref if (unref_cur == unref_size) { new_unref_list = realloc(unref_list, (unref_size + UNREF_SIZE_STEP) * sizeof(void *)); if (new_unref_list == NULL) { usbi_err(ctx, "could not realloc list for unref - aborting"); LOOP_BREAK(LIBUSB_ERROR_NO_MEM); } unref_list = new_unref_list; unref_size += UNREF_SIZE_STEP; } unref_list[unref_cur++] = dev; } // Setup device switch (pass) { case HUB_PASS: case DEV_PASS: // If the device has already been setup, don't do it again if (priv->path != NULL) break; // Take care of API initialization priv->path = dev_interface_path; dev_interface_path = NULL; priv->apib = &usb_api_backend[api]; priv->sub_api = sub_api; switch (api) { case USB_API_COMPOSITE: case USB_API_HUB: break; case USB_API_HID: priv->hid = calloc(1, sizeof(struct hid_device_priv)); if (priv->hid == NULL) LOOP_BREAK(LIBUSB_ERROR_NO_MEM); break; default: // For other devices, the first interface is the same as the device priv->usb_interface[0].path = _strdup(priv->path); if (priv->usb_interface[0].path == NULL) LOOP_BREAK(LIBUSB_ERROR_NO_MEM); // The following is needed if we want API calls to work for both simple // and composite devices. for (j = 0; j < USB_MAXINTERFACES; j++) priv->usb_interface[j].apib = &usb_api_backend[api]; break; } break; case HCD_PASS: r = enumerate_hcd_root_hub(ctx, dev_id, (uint8_t)(i + 1), dev_info_data.DevInst); break; case GEN_PASS: // The SPDRP_ADDRESS for USB devices is the device port number on the hub port_nr = 0; if (!pSetupDiGetDeviceRegistryPropertyA(*dev_info, &dev_info_data, SPDRP_ADDRESS, NULL, (PBYTE)&port_nr, sizeof(port_nr), &size) || (size != sizeof(port_nr))) usbi_warn(ctx, "could not retrieve port number for device '%s': %s", dev_id, windows_error_str(0)); r = init_device(dev, parent_dev, (uint8_t)port_nr, dev_info_data.DevInst); if (r == LIBUSB_SUCCESS) { // Append device to the list of discovered devices discdevs = discovered_devs_append(*_discdevs, dev); if (!discdevs) LOOP_BREAK(LIBUSB_ERROR_NO_MEM); *_discdevs = discdevs; } else if (r == LIBUSB_ERROR_NO_DEVICE) { // This can occur if the device was disconnected but Windows hasn't // refreshed its enumeration yet - in that case, we ignore the device r = LIBUSB_SUCCESS; } break; default: // HID_PASS and later if (parent_priv->apib->id == USB_API_HID || parent_priv->apib->id == USB_API_COMPOSITE) { if (parent_priv->apib->id == USB_API_HID) { usbi_dbg("setting HID interface for [%lX]:", parent_dev->session_data); r = set_hid_interface(ctx, parent_dev, dev_interface_path); } else { usbi_dbg("setting composite interface for [%lX]:", parent_dev->session_data); r = set_composite_interface(ctx, parent_dev, dev_interface_path, dev_id, api, sub_api); } switch (r) { case LIBUSB_SUCCESS: dev_interface_path = NULL; break; case LIBUSB_ERROR_ACCESS: // interface has already been set => make sure dev_interface_path is freed then r = LIBUSB_SUCCESS; break; default: LOOP_BREAK(r); break; } } libusb_unref_device(parent_dev); break; } } } pSetupDiDestroyDeviceInfoList(dev_info_intf); // Free any additional GUIDs for (pass = EXT_PASS; pass < nb_guids; pass++) free((void *)guid_list[pass]); free((void *)guid_list); // Free any PnP enumerator strings for (i = 1; i < nb_usb_enumerators; i++) free(usb_enumerator[i]); // Unref newly allocated devs for (i = 0; i < unref_cur; i++) libusb_unref_device(unref_list[i]); free(unref_list); return r; } static int winusb_get_device_descriptor(struct libusb_device *dev, unsigned char *buffer) { struct winusb_device_priv *priv = _device_priv(dev); memcpy(buffer, &priv->dev_descriptor, DEVICE_DESC_LENGTH); return LIBUSB_SUCCESS; } static int winusb_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len) { struct winusb_device_priv *priv = _device_priv(dev); PUSB_CONFIGURATION_DESCRIPTOR config_header; size_t size; // config index is zero based if (config_index >= dev->num_configurations) return LIBUSB_ERROR_INVALID_PARAM; if ((priv->config_descriptor == NULL) || (priv->config_descriptor[config_index] == NULL)) return LIBUSB_ERROR_NOT_FOUND; config_header = priv->config_descriptor[config_index]; size = MIN(config_header->wTotalLength, len); memcpy(buffer, priv->config_descriptor[config_index], size); return (int)size; } static int winusb_get_config_descriptor_by_value(struct libusb_device *dev, uint8_t bConfigurationValue, unsigned char **buffer) { struct winusb_device_priv *priv = _device_priv(dev); PUSB_CONFIGURATION_DESCRIPTOR config_header; uint8_t index; if (priv->config_descriptor == NULL) return LIBUSB_ERROR_NOT_FOUND; for (index = 0; index < dev->num_configurations; index++) { config_header = priv->config_descriptor[index]; if (config_header == NULL) continue; if (config_header->bConfigurationValue == bConfigurationValue) { *buffer = (unsigned char *)priv->config_descriptor[index]; return (int)config_header->wTotalLength; } } return LIBUSB_ERROR_NOT_FOUND; } /* * return the cached copy of the active config descriptor */ static int winusb_get_active_config_descriptor(struct libusb_device *dev, unsigned char *buffer, size_t len) { struct winusb_device_priv *priv = _device_priv(dev); unsigned char *config_desc; int r; if (priv->active_config == 0) return LIBUSB_ERROR_NOT_FOUND; r = winusb_get_config_descriptor_by_value(dev, priv->active_config, &config_desc); if (r < 0) return r; len = MIN((size_t)r, len); memcpy(buffer, config_desc, len); return (int)len; } static int winusb_open(struct libusb_device_handle *dev_handle) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_SUPPORTED_API(priv->apib, open); return priv->apib->open(SUB_API_NOTSET, dev_handle); } static void winusb_close(struct libusb_device_handle *dev_handle) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); if (priv->apib->close) priv->apib->close(SUB_API_NOTSET, dev_handle); } static int winusb_get_configuration(struct libusb_device_handle *dev_handle, int *config) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); if (priv->active_config == 0) { *config = 0; return LIBUSB_ERROR_NOT_FOUND; } *config = priv->active_config; return LIBUSB_SUCCESS; } /* * from http://msdn.microsoft.com/en-us/library/ms793522.aspx: "The port driver * does not currently expose a service that allows higher-level drivers to set * the configuration." */ static int winusb_set_configuration(struct libusb_device_handle *dev_handle, int config) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); int r = LIBUSB_SUCCESS; if (config >= USB_MAXCONFIG) return LIBUSB_ERROR_INVALID_PARAM; r = libusb_control_transfer(dev_handle, LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_STANDARD | LIBUSB_RECIPIENT_DEVICE, LIBUSB_REQUEST_SET_CONFIGURATION, (uint16_t)config, 0, NULL, 0, 1000); if (r == LIBUSB_SUCCESS) priv->active_config = (uint8_t)config; return r; } static int winusb_claim_interface(struct libusb_device_handle *dev_handle, int iface) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); int r; CHECK_SUPPORTED_API(priv->apib, claim_interface); safe_free(priv->usb_interface[iface].endpoint); priv->usb_interface[iface].nb_endpoints = 0; r = priv->apib->claim_interface(SUB_API_NOTSET, dev_handle, iface); if (r == LIBUSB_SUCCESS) r = windows_assign_endpoints(dev_handle, iface, 0); return r; } static int winusb_set_interface_altsetting(struct libusb_device_handle *dev_handle, int iface, int altsetting) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); int r; CHECK_SUPPORTED_API(priv->apib, set_interface_altsetting); safe_free(priv->usb_interface[iface].endpoint); priv->usb_interface[iface].nb_endpoints = 0; r = priv->apib->set_interface_altsetting(SUB_API_NOTSET, dev_handle, iface, altsetting); if (r == LIBUSB_SUCCESS) r = windows_assign_endpoints(dev_handle, iface, altsetting); return r; } static int winusb_release_interface(struct libusb_device_handle *dev_handle, int iface) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_SUPPORTED_API(priv->apib, release_interface); return priv->apib->release_interface(SUB_API_NOTSET, dev_handle, iface); } static int winusb_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_SUPPORTED_API(priv->apib, clear_halt); return priv->apib->clear_halt(SUB_API_NOTSET, dev_handle, endpoint); } static int winusb_reset_device(struct libusb_device_handle *dev_handle) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_SUPPORTED_API(priv->apib, reset_device); return priv->apib->reset_device(SUB_API_NOTSET, dev_handle); } static void winusb_destroy_device(struct libusb_device *dev) { winusb_device_priv_release(dev); } static void winusb_clear_transfer_priv(struct usbi_transfer *itransfer) { struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); int sub_api = priv->sub_api; usbi_close(transfer_priv->pollable_fd.fd); transfer_priv->pollable_fd = INVALID_WINFD; transfer_priv->handle = NULL; safe_free(transfer_priv->hid_buffer); if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS && sub_api == SUB_API_WINUSB) { if (transfer_priv->isoch_buffer_handle != NULL) { if (WinUSBX[sub_api].UnregisterIsochBuffer(transfer_priv->isoch_buffer_handle)) { transfer_priv->isoch_buffer_handle = NULL; } else { usbi_dbg("Couldn't unregister isoch buffer!"); } } } safe_free(transfer_priv->iso_context); // When auto claim is in use, attempt to release the auto-claimed interface auto_release(itransfer); } static int do_submit_transfer(struct usbi_transfer *itransfer, short events, int (*transfer_fn)(int, struct usbi_transfer *)) { struct libusb_context *ctx = ITRANSFER_CTX(itransfer); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winfd wfd; int r; wfd = usbi_create_fd(); if (wfd.fd < 0) return LIBUSB_ERROR_NO_MEM; r = usbi_add_pollfd(ctx, wfd.fd, events); if (r) { usbi_close(wfd.fd); return r; } // Use transfer_priv to store data needed for async polling transfer_priv->pollable_fd = wfd; r = transfer_fn(SUB_API_NOTSET, itransfer); if ((r != LIBUSB_SUCCESS) && (r != LIBUSB_ERROR_OVERFLOW)) { usbi_remove_pollfd(ctx, wfd.fd); usbi_close(wfd.fd); transfer_priv->pollable_fd = INVALID_WINFD; } return r; } static int winusb_submit_transfer(struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); int (*transfer_fn)(int, struct usbi_transfer *); short events; switch (transfer->type) { case LIBUSB_TRANSFER_TYPE_CONTROL: events = (transfer->buffer[0] & LIBUSB_ENDPOINT_IN) ? POLLIN : POLLOUT; transfer_fn = priv->apib->submit_control_transfer; break; 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; events = IS_XFERIN(transfer) ? POLLIN : POLLOUT; transfer_fn = priv->apib->submit_bulk_transfer; break; case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS: events = IS_XFERIN(transfer) ? POLLIN : POLLOUT; transfer_fn = priv->apib->submit_iso_transfer; break; case LIBUSB_TRANSFER_TYPE_BULK_STREAM: return LIBUSB_ERROR_NOT_SUPPORTED; default: usbi_err(TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type); return LIBUSB_ERROR_INVALID_PARAM; } if (transfer_fn == NULL) { usbi_warn(TRANSFER_CTX(transfer), "unsupported transfer type %d (unrecognized device driver)", transfer->type); return LIBUSB_ERROR_NOT_SUPPORTED; } return do_submit_transfer(itransfer, events, transfer_fn); } static int windows_abort_control(struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); CHECK_SUPPORTED_API(priv->apib, abort_control); return priv->apib->abort_control(SUB_API_NOTSET, itransfer); } static int windows_abort_transfers(struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); CHECK_SUPPORTED_API(priv->apib, abort_transfers); return priv->apib->abort_transfers(SUB_API_NOTSET, itransfer); } static int winusb_cancel_transfer(struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); switch (transfer->type) { case LIBUSB_TRANSFER_TYPE_CONTROL: return windows_abort_control(itransfer); case LIBUSB_TRANSFER_TYPE_BULK: case LIBUSB_TRANSFER_TYPE_INTERRUPT: case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS: return windows_abort_transfers(itransfer); case LIBUSB_TRANSFER_TYPE_BULK_STREAM: return LIBUSB_ERROR_NOT_SUPPORTED; default: usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type); return LIBUSB_ERROR_INVALID_PARAM; } } static int winusb_copy_transfer_data(struct usbi_transfer *itransfer, uint32_t io_size) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); return priv->apib->copy_transfer_data(SUB_API_NOTSET, itransfer, io_size); } static int winusb_get_transfer_fd(struct usbi_transfer *itransfer) { struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); return transfer_priv->pollable_fd.fd; } static void winusb_get_overlapped_result(struct usbi_transfer *itransfer, DWORD *io_result, DWORD *io_size) { struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winfd *pollable_fd = &transfer_priv->pollable_fd; if (HasOverlappedIoCompletedSync(pollable_fd->overlapped)) { *io_result = NO_ERROR; *io_size = (DWORD)pollable_fd->overlapped->InternalHigh; } else if (GetOverlappedResult(transfer_priv->handle, pollable_fd->overlapped, io_size, FALSE)) { // Regular async overlapped *io_result = NO_ERROR; } else { *io_result = GetLastError(); } } // NB: MSVC6 does not support named initializers. const struct windows_backend winusb_backend = { winusb_init, winusb_exit, winusb_get_device_list, winusb_open, winusb_close, winusb_get_device_descriptor, winusb_get_active_config_descriptor, winusb_get_config_descriptor, winusb_get_config_descriptor_by_value, winusb_get_configuration, winusb_set_configuration, winusb_claim_interface, winusb_release_interface, winusb_set_interface_altsetting, winusb_clear_halt, winusb_reset_device, winusb_destroy_device, winusb_submit_transfer, winusb_cancel_transfer, winusb_clear_transfer_priv, winusb_copy_transfer_data, winusb_get_transfer_fd, winusb_get_overlapped_result, }; /* * USB API backends */ static const char * const composite_driver_names[] = {"USBCCGP"}; static const char * const winusbx_driver_names[] = {"libusbK", "libusb0", "WinUSB"}; static const char * const hid_driver_names[] = {"HIDUSB", "MOUHID", "KBDHID"}; const struct windows_usb_api_backend usb_api_backend[USB_API_MAX] = { { USB_API_UNSUPPORTED, "Unsupported API", // No supported operations }, { USB_API_HUB, "HUB API", // No supported operations }, { USB_API_COMPOSITE, "Composite API", composite_driver_names, ARRAYSIZE(composite_driver_names), NULL, /* init */ NULL, /* exit */ composite_open, composite_close, NULL, /* configure_endpoints */ composite_claim_interface, composite_set_interface_altsetting, composite_release_interface, composite_clear_halt, composite_reset_device, composite_submit_bulk_transfer, composite_submit_iso_transfer, composite_submit_control_transfer, composite_abort_control, composite_abort_transfers, composite_copy_transfer_data, }, { USB_API_WINUSBX, "WinUSB-like APIs", winusbx_driver_names, ARRAYSIZE(winusbx_driver_names), winusbx_init, winusbx_exit, winusbx_open, winusbx_close, winusbx_configure_endpoints, winusbx_claim_interface, winusbx_set_interface_altsetting, winusbx_release_interface, winusbx_clear_halt, winusbx_reset_device, winusbx_submit_bulk_transfer, winusbx_submit_iso_transfer, winusbx_submit_control_transfer, winusbx_abort_control, winusbx_abort_transfers, winusbx_copy_transfer_data, }, { USB_API_HID, "HID API", hid_driver_names, ARRAYSIZE(hid_driver_names), hid_init, hid_exit, hid_open, hid_close, NULL, /* configure_endpoints */ hid_claim_interface, hid_set_interface_altsetting, hid_release_interface, hid_clear_halt, hid_reset_device, hid_submit_bulk_transfer, NULL, /* submit_iso_transfer */ hid_submit_control_transfer, hid_abort_transfers, hid_abort_transfers, hid_copy_transfer_data, }, }; /* * WinUSB-like (WinUSB, libusb0/libusbK through libusbk DLL) API functions */ #define WinUSBX_Set(fn) \ do { \ if (native_winusb) \ WinUSBX[i].fn = (WinUsb_##fn##_t)GetProcAddress(h, "WinUsb_" #fn); \ else \ pLibK_GetProcAddress((PVOID *)&WinUSBX[i].fn, i, KUSB_FNID_##fn); \ } while (0) #define NativeWinUSBOnly_Set(fn) \ do { \ if (native_winusb) \ WinUSBX[i].fn = (WinUsb_##fn##_t)GetProcAddress(h, "WinUsb_" #fn); \ else \ WinUSBX[i].fn = NULL; \ } while (0) static int winusbx_init(struct libusb_context *ctx) { HMODULE h; bool native_winusb; int i; KLIB_VERSION LibK_Version; LibK_GetProcAddress_t pLibK_GetProcAddress = NULL; LibK_GetVersion_t pLibK_GetVersion; h = LoadLibraryA("libusbK"); if (h == NULL) { usbi_info(ctx, "libusbK DLL is not available, will use native WinUSB"); h = LoadLibraryA("WinUSB"); if (h == NULL) { usbi_warn(ctx, "WinUSB DLL is not available either, " "you will not be able to access devices outside of enumeration"); return LIBUSB_ERROR_NOT_FOUND; } } else { usbi_dbg("using libusbK DLL for universal access"); pLibK_GetVersion = (LibK_GetVersion_t)GetProcAddress(h, "LibK_GetVersion"); if (pLibK_GetVersion != NULL) { pLibK_GetVersion(&LibK_Version); usbi_dbg("libusbK version: %d.%d.%d.%d", LibK_Version.Major, LibK_Version.Minor, LibK_Version.Micro, LibK_Version.Nano); } pLibK_GetProcAddress = (LibK_GetProcAddress_t)GetProcAddress(h, "LibK_GetProcAddress"); if (pLibK_GetProcAddress == NULL) { usbi_err(ctx, "LibK_GetProcAddress() not found in libusbK DLL"); FreeLibrary(h); return LIBUSB_ERROR_NOT_FOUND; } } native_winusb = (pLibK_GetProcAddress == NULL); for (i = 0; i < SUB_API_MAX; i++) { WinUSBX_Set(AbortPipe); WinUSBX_Set(ControlTransfer); WinUSBX_Set(FlushPipe); WinUSBX_Set(Free); WinUSBX_Set(GetAssociatedInterface); WinUSBX_Set(Initialize); WinUSBX_Set(ReadPipe); if (!native_winusb) WinUSBX_Set(ResetDevice); WinUSBX_Set(ResetPipe); WinUSBX_Set(SetCurrentAlternateSetting); WinUSBX_Set(SetPipePolicy); WinUSBX_Set(WritePipe); WinUSBX_Set(IsoReadPipe); WinUSBX_Set(IsoWritePipe); NativeWinUSBOnly_Set(RegisterIsochBuffer); NativeWinUSBOnly_Set(UnregisterIsochBuffer); NativeWinUSBOnly_Set(WriteIsochPipeAsap); NativeWinUSBOnly_Set(ReadIsochPipeAsap); NativeWinUSBOnly_Set(QueryPipeEx); if (WinUSBX[i].Initialize != NULL) { WinUSBX[i].initialized = true; // Assume driver supports CancelIoEx() if it is available WinUSBX[i].CancelIoEx_supported = (pCancelIoEx != NULL); usbi_dbg("initalized sub API %s", winusbx_driver_names[i]); } else { usbi_warn(ctx, "Failed to initalize sub API %s", winusbx_driver_names[i]); WinUSBX[i].initialized = false; } } WinUSBX_handle = h; return LIBUSB_SUCCESS; } static void winusbx_exit(void) { if (WinUSBX_handle != NULL) { FreeLibrary(WinUSBX_handle); WinUSBX_handle = NULL; /* Reset the WinUSBX API structures */ memset(&WinUSBX, 0, sizeof(WinUSBX)); } } // NB: open and close must ensure that they only handle interface of // the right API type, as these functions can be called wholesale from // composite_open(), with interfaces belonging to different APIs static int winusbx_open(int sub_api, struct libusb_device_handle *dev_handle) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); HANDLE file_handle; int i; CHECK_WINUSBX_AVAILABLE(sub_api); // WinUSB requires a separate handle for each interface for (i = 0; i < USB_MAXINTERFACES; i++) { if ((priv->usb_interface[i].path != NULL) && (priv->usb_interface[i].apib->id == USB_API_WINUSBX)) { file_handle = CreateFileA(priv->usb_interface[i].path, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL); if (file_handle == INVALID_HANDLE_VALUE) { usbi_err(ctx, "could not open device %s (interface %d): %s", priv->usb_interface[i].path, i, windows_error_str(0)); switch (GetLastError()) { case ERROR_FILE_NOT_FOUND: // The device was disconnected return LIBUSB_ERROR_NO_DEVICE; case ERROR_ACCESS_DENIED: return LIBUSB_ERROR_ACCESS; default: return LIBUSB_ERROR_IO; } } handle_priv->interface_handle[i].dev_handle = file_handle; } } return LIBUSB_SUCCESS; } static void winusbx_close(int sub_api, struct libusb_device_handle *dev_handle) { struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); HANDLE handle; int i; if (sub_api == SUB_API_NOTSET) sub_api = priv->sub_api; if (!WinUSBX[sub_api].initialized) return; if (priv->apib->id == USB_API_COMPOSITE) { // If this is a composite device, just free and close all WinUSB-like // interfaces directly (each is independent and not associated with another) for (i = 0; i < USB_MAXINTERFACES; i++) { if (priv->usb_interface[i].apib->id == USB_API_WINUSBX) { handle = handle_priv->interface_handle[i].api_handle; if (HANDLE_VALID(handle)) WinUSBX[sub_api].Free(handle); handle = handle_priv->interface_handle[i].dev_handle; if (HANDLE_VALID(handle)) CloseHandle(handle); } } } else { // If this is a WinUSB device, free all interfaces above interface 0, // then free and close interface 0 last for (i = 1; i < USB_MAXINTERFACES; i++) { handle = handle_priv->interface_handle[i].api_handle; if (HANDLE_VALID(handle)) WinUSBX[sub_api].Free(handle); } handle = handle_priv->interface_handle[0].api_handle; if (HANDLE_VALID(handle)) WinUSBX[sub_api].Free(handle); handle = handle_priv->interface_handle[0].dev_handle; if (HANDLE_VALID(handle)) CloseHandle(handle); } } static int winusbx_configure_endpoints(int sub_api, struct libusb_device_handle *dev_handle, int iface) { struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); HANDLE winusb_handle = handle_priv->interface_handle[iface].api_handle; UCHAR policy; ULONG timeout = 0; uint8_t endpoint_address; int i; CHECK_WINUSBX_AVAILABLE(sub_api); // With handle and enpoints set (in parent), we can setup the default pipe properties // see http://download.microsoft.com/download/D/1/D/D1DD7745-426B-4CC3-A269-ABBBE427C0EF/DVC-T705_DDC08.pptx for (i = -1; i < priv->usb_interface[iface].nb_endpoints; i++) { endpoint_address = (i == -1) ? 0 : priv->usb_interface[iface].endpoint[i]; if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address, PIPE_TRANSFER_TIMEOUT, sizeof(ULONG), &timeout)) usbi_dbg("failed to set PIPE_TRANSFER_TIMEOUT for control endpoint %02X", endpoint_address); if ((i == -1) || (sub_api == SUB_API_LIBUSB0)) continue; // Other policies don't apply to control endpoint or libusb0 policy = false; if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address, SHORT_PACKET_TERMINATE, sizeof(UCHAR), &policy)) usbi_dbg("failed to disable SHORT_PACKET_TERMINATE for endpoint %02X", endpoint_address); if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address, IGNORE_SHORT_PACKETS, sizeof(UCHAR), &policy)) usbi_dbg("failed to disable IGNORE_SHORT_PACKETS for endpoint %02X", endpoint_address); policy = true; /* ALLOW_PARTIAL_READS must be enabled due to likely libusbK bug. See: https://sourceforge.net/mailarchive/message.php?msg_id=29736015 */ if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address, ALLOW_PARTIAL_READS, sizeof(UCHAR), &policy)) usbi_dbg("failed to enable ALLOW_PARTIAL_READS for endpoint %02X", endpoint_address); if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address, AUTO_CLEAR_STALL, sizeof(UCHAR), &policy)) usbi_dbg("failed to enable AUTO_CLEAR_STALL for endpoint %02X", endpoint_address); if (sub_api == SUB_API_LIBUSBK) { if (!WinUSBX[sub_api].SetPipePolicy(winusb_handle, endpoint_address, ISO_ALWAYS_START_ASAP, sizeof(UCHAR), &policy)) usbi_dbg("failed to enable ISO_ALWAYS_START_ASAP for endpoint %02X", endpoint_address); } } return LIBUSB_SUCCESS; } static int winusbx_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); bool is_using_usbccgp = (priv->apib->id == USB_API_COMPOSITE); SP_DEVICE_INTERFACE_DETAIL_DATA_A *dev_interface_details = NULL; HDEVINFO dev_info = INVALID_HANDLE_VALUE; SP_DEVINFO_DATA dev_info_data; char *dev_path_no_guid = NULL; char filter_path[] = "\\\\.\\libusb0-0000"; bool found_filter = false; HANDLE file_handle, winusb_handle; DWORD err; int i; CHECK_WINUSBX_AVAILABLE(sub_api); // If the device is composite, but using the default Windows composite parent driver (usbccgp) // or if it's the first WinUSB-like interface, we get a handle through Initialize(). if ((is_using_usbccgp) || (iface == 0)) { // composite device (independent interfaces) or interface 0 file_handle = handle_priv->interface_handle[iface].dev_handle; if (!HANDLE_VALID(file_handle)) return LIBUSB_ERROR_NOT_FOUND; if (!WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) { handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE; err = GetLastError(); switch (err) { case ERROR_BAD_COMMAND: // The device was disconnected usbi_err(ctx, "could not access interface %d: %s", iface, windows_error_str(0)); return LIBUSB_ERROR_NO_DEVICE; default: // it may be that we're using the libusb0 filter driver. // TODO: can we move this whole business into the K/0 DLL? for (i = 0; ; i++) { safe_free(dev_interface_details); safe_free(dev_path_no_guid); dev_interface_details = get_interface_details_filter(ctx, &dev_info, &dev_info_data, &GUID_DEVINTERFACE_LIBUSB0_FILTER, i, filter_path); if ((found_filter) || (dev_interface_details == NULL)) break; // ignore GUID part dev_path_no_guid = sanitize_path(strtok(dev_interface_details->DevicePath, "{")); if (dev_path_no_guid == NULL) continue; if (strncmp(dev_path_no_guid, priv->usb_interface[iface].path, strlen(dev_path_no_guid)) == 0) { file_handle = CreateFileA(filter_path, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL); if (file_handle != INVALID_HANDLE_VALUE) { if (WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) { // Replace the existing file handle with the working one CloseHandle(handle_priv->interface_handle[iface].dev_handle); handle_priv->interface_handle[iface].dev_handle = file_handle; found_filter = true; } else { usbi_err(ctx, "could not initialize filter driver for %s", filter_path); CloseHandle(file_handle); } } else { usbi_err(ctx, "could not open device %s: %s", filter_path, windows_error_str(0)); } } } free(dev_interface_details); if (!found_filter) { usbi_err(ctx, "could not access interface %d: %s", iface, windows_error_str(err)); return LIBUSB_ERROR_ACCESS; } } } handle_priv->interface_handle[iface].api_handle = winusb_handle; } else { // For all other interfaces, use GetAssociatedInterface() winusb_handle = handle_priv->interface_handle[0].api_handle; // It is a requirement for multiple interface devices on Windows that, to you // must first claim the first interface before you claim the others if (!HANDLE_VALID(winusb_handle)) { file_handle = handle_priv->interface_handle[0].dev_handle; if (WinUSBX[sub_api].Initialize(file_handle, &winusb_handle)) { handle_priv->interface_handle[0].api_handle = winusb_handle; usbi_warn(ctx, "auto-claimed interface 0 (required to claim %d with WinUSB)", iface); } else { usbi_warn(ctx, "failed to auto-claim interface 0 (required to claim %d with WinUSB): %s", iface, windows_error_str(0)); return LIBUSB_ERROR_ACCESS; } } if (!WinUSBX[sub_api].GetAssociatedInterface(winusb_handle, (UCHAR)(iface - 1), &handle_priv->interface_handle[iface].api_handle)) { handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE; switch (GetLastError()) { case ERROR_NO_MORE_ITEMS: // invalid iface return LIBUSB_ERROR_NOT_FOUND; case ERROR_BAD_COMMAND: // The device was disconnected return LIBUSB_ERROR_NO_DEVICE; case ERROR_ALREADY_EXISTS: // already claimed return LIBUSB_ERROR_BUSY; default: usbi_err(ctx, "could not claim interface %d: %s", iface, windows_error_str(0)); return LIBUSB_ERROR_ACCESS; } } handle_priv->interface_handle[iface].dev_handle = handle_priv->interface_handle[0].dev_handle; } usbi_dbg("claimed interface %d", iface); handle_priv->active_interface = iface; return LIBUSB_SUCCESS; } static int winusbx_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface) { struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); HANDLE winusb_handle; CHECK_WINUSBX_AVAILABLE(sub_api); winusb_handle = handle_priv->interface_handle[iface].api_handle; if (!HANDLE_VALID(winusb_handle)) return LIBUSB_ERROR_NOT_FOUND; WinUSBX[sub_api].Free(winusb_handle); handle_priv->interface_handle[iface].api_handle = INVALID_HANDLE_VALUE; return LIBUSB_SUCCESS; } /* * Return the first valid interface (of the same API type), for control transfers */ static int get_valid_interface(struct libusb_device_handle *dev_handle, int api_id) { struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); int i; if ((api_id < USB_API_WINUSBX) || (api_id > USB_API_HID)) { usbi_dbg("unsupported API ID"); return -1; } for (i = 0; i < USB_MAXINTERFACES; i++) { if (HANDLE_VALID(handle_priv->interface_handle[i].dev_handle) && HANDLE_VALID(handle_priv->interface_handle[i].api_handle) && (priv->usb_interface[i].apib->id == api_id)) return i; } return -1; } /* * Check a specific interface is valid (of the same API type), for control transfers */ static int check_valid_interface(struct libusb_device_handle *dev_handle, unsigned short interface, int api_id) { if (interface >= USB_MAXINTERFACES) return -1; struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); if ((api_id < USB_API_WINUSBX) || (api_id > USB_API_HID)) { usbi_dbg("unsupported API ID"); return -1; } // try the requested interface if (HANDLE_VALID(handle_priv->interface_handle[interface].dev_handle) && HANDLE_VALID(handle_priv->interface_handle[interface].api_handle) && (priv->usb_interface[interface].apib->id == api_id)) return interface; return -1; } /* * Lookup interface by endpoint address. -1 if not found */ static int interface_by_endpoint(struct winusb_device_priv *priv, struct winusb_device_handle_priv *handle_priv, uint8_t endpoint_address) { int i, j; for (i = 0; i < USB_MAXINTERFACES; i++) { if (!HANDLE_VALID(handle_priv->interface_handle[i].api_handle)) continue; if (priv->usb_interface[i].endpoint == NULL) continue; for (j = 0; j < priv->usb_interface[i].nb_endpoints; j++) { if (priv->usb_interface[i].endpoint[j] == endpoint_address) return i; } } return -1; } static int winusbx_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); PWINUSB_SETUP_PACKET setup = (PWINUSB_SETUP_PACKET)transfer->buffer; ULONG size; HANDLE winusb_handle; OVERLAPPED *overlapped; int current_interface; CHECK_WINUSBX_AVAILABLE(sub_api); size = transfer->length - LIBUSB_CONTROL_SETUP_SIZE; // Windows places upper limits on the control transfer size // See: https://msdn.microsoft.com/en-us/library/windows/hardware/ff538112.aspx if (size > MAX_CTRL_BUFFER_LENGTH) return LIBUSB_ERROR_INVALID_PARAM; if ((setup->RequestType & 0x1F) == LIBUSB_RECIPIENT_INTERFACE) current_interface = check_valid_interface(transfer->dev_handle, setup->Index & 0xff, USB_API_WINUSBX); else current_interface = get_valid_interface(transfer->dev_handle, USB_API_WINUSBX); if (current_interface < 0) { if (auto_claim(transfer, ¤t_interface, USB_API_WINUSBX) != LIBUSB_SUCCESS) return LIBUSB_ERROR_NOT_FOUND; } usbi_dbg("will use interface %d", current_interface); transfer_priv->handle = winusb_handle = handle_priv->interface_handle[current_interface].api_handle; overlapped = transfer_priv->pollable_fd.overlapped; // Sending of set configuration control requests from WinUSB creates issues, except when using libusb0.sys if (sub_api != SUB_API_LIBUSB0 && (LIBUSB_REQ_TYPE(setup->RequestType) == LIBUSB_REQUEST_TYPE_STANDARD) && (setup->Request == LIBUSB_REQUEST_SET_CONFIGURATION)) { if (setup->Value != priv->active_config) { usbi_warn(ctx, "cannot set configuration other than the default one"); return LIBUSB_ERROR_INVALID_PARAM; } windows_force_sync_completion(overlapped, 0); } else { if (!WinUSBX[sub_api].ControlTransfer(winusb_handle, *setup, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, size, NULL, overlapped)) { if (GetLastError() != ERROR_IO_PENDING) { usbi_warn(ctx, "ControlTransfer failed: %s", windows_error_str(0)); return LIBUSB_ERROR_IO; } } else { windows_force_sync_completion(overlapped, size); } } transfer_priv->interface_number = (uint8_t)current_interface; return LIBUSB_SUCCESS; } static int winusbx_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); HANDLE winusb_handle; CHECK_WINUSBX_AVAILABLE(sub_api); if (altsetting > 255) return LIBUSB_ERROR_INVALID_PARAM; winusb_handle = handle_priv->interface_handle[iface].api_handle; if (!HANDLE_VALID(winusb_handle)) { usbi_err(ctx, "interface must be claimed first"); return LIBUSB_ERROR_NOT_FOUND; } if (!WinUSBX[sub_api].SetCurrentAlternateSetting(winusb_handle, (UCHAR)altsetting)) { usbi_err(ctx, "SetCurrentAlternateSetting failed: %s", windows_error_str(0)); return LIBUSB_ERROR_IO; } return LIBUSB_SUCCESS; } static enum libusb_transfer_status usbd_status_to_libusb_transfer_status(USBD_STATUS status) { /* Based on https://msdn.microsoft.com/en-us/library/windows/hardware/ff539136(v=vs.85).aspx : * USBD_STATUS have the most significant 4 bits indicating overall status and the rest gives the details. */ switch (status >> 28) { case 0x00: /* USBD_STATUS_SUCCESS */ return LIBUSB_TRANSFER_COMPLETED; case 0x01: /* USBD_STATUS_PENDING */ return LIBUSB_TRANSFER_COMPLETED; default: /* USBD_STATUS_ERROR */ switch (status & 0x0fffffff) { case 0xC0006000: /* USBD_STATUS_TIMEOUT */ return LIBUSB_TRANSFER_TIMED_OUT; case 0xC0010000: /* USBD_STATUS_CANCELED */ return LIBUSB_TRANSFER_CANCELLED; case 0xC0000030: /* USBD_STATUS_ENDPOINT_HALTED */ return LIBUSB_TRANSFER_STALL; case 0xC0007000: /* USBD_STATUS_DEVICE_GONE */ return LIBUSB_TRANSFER_NO_DEVICE; default: usbi_dbg("USBD_STATUS 0x%08lx translated to LIBUSB_TRANSFER_ERROR", status); return LIBUSB_TRANSFER_ERROR; } } } static void WINAPI winusbx_native_iso_transfer_continue_stream_callback(struct libusb_transfer *transfer) { // If this callback is invoked, this means that we attempted to set ContinueStream // to TRUE when calling Read/WriteIsochPipeAsap in winusbx_do_iso_transfer. // The role of this callback is to fallback to ContinueStream = FALSE if the transfer // did not succeed. struct winusb_transfer_priv *transfer_priv = (struct winusb_transfer_priv *) usbi_transfer_get_os_priv(LIBUSB_TRANSFER_TO_USBI_TRANSFER(transfer)); BOOL fallback = (transfer->status != LIBUSB_TRANSFER_COMPLETED); int idx; // Restore the user callback transfer->callback = transfer_priv->iso_user_callback; for (idx = 0; idx < transfer->num_iso_packets && !fallback; ++idx) { if (transfer->iso_packet_desc[idx].status != LIBUSB_TRANSFER_COMPLETED) { fallback = TRUE; } } if (!fallback) { // If the transfer was successful, we restore the user callback and call it. if (transfer->callback) { transfer->callback(transfer); } } else { // If the transfer wasn't successful we reschedule the transfer while forcing it // not to continue the stream. This might results in a 5-ms delay. transfer_priv->iso_break_stream = TRUE; libusb_submit_transfer(transfer); } } static int winusbx_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); HANDLE winusb_handle; OVERLAPPED *overlapped; bool ret; int current_interface; CHECK_WINUSBX_AVAILABLE(sub_api); current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint); if (current_interface < 0) { usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer"); return LIBUSB_ERROR_NOT_FOUND; } else { usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface); } transfer_priv->handle = winusb_handle = handle_priv->interface_handle[current_interface].api_handle; overlapped = transfer_priv->pollable_fd.overlapped; if ((sub_api == SUB_API_LIBUSBK) || (sub_api == SUB_API_LIBUSB0)) { int i; UINT offset; size_t iso_ctx_size; PKISO_CONTEXT iso_context; iso_ctx_size = sizeof(KISO_CONTEXT) + (transfer->num_iso_packets * sizeof(KISO_PACKET)); transfer_priv->iso_context = iso_context = calloc(1, iso_ctx_size); if (transfer_priv->iso_context == NULL) return LIBUSB_ERROR_NO_MEM; // start ASAP iso_context->StartFrame = 0; iso_context->NumberOfPackets = (SHORT)transfer->num_iso_packets; // convert the transfer packet lengths to iso_packet offsets offset = 0; for (i = 0; i < transfer->num_iso_packets; i++) { iso_context->IsoPackets[i].offset = offset; offset += transfer->iso_packet_desc[i].length; } if (IS_XFERIN(transfer)) { usbi_dbg("reading %d iso packets", transfer->num_iso_packets); ret = WinUSBX[sub_api].IsoReadPipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, overlapped, iso_context); } else { usbi_dbg("writing %d iso packets", transfer->num_iso_packets); ret = WinUSBX[sub_api].IsoWritePipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, overlapped, iso_context); } if (!ret) { if (GetLastError() != ERROR_IO_PENDING) { usbi_err(ctx, "IsoReadPipe/IsoWritePipe failed: %s", windows_error_str(0)); return LIBUSB_ERROR_IO; } } else { windows_force_sync_completion(overlapped, (ULONG)transfer->length); } transfer_priv->interface_number = (uint8_t)current_interface; return LIBUSB_SUCCESS; } else if (sub_api == SUB_API_WINUSB) { WINUSB_PIPE_INFORMATION_EX pipe_info_ex = { 0 }; WINUSB_ISOCH_BUFFER_HANDLE buffer_handle; ULONG iso_transfer_size_multiple; int out_transfer_length = 0; int idx; # define WINUSBX_CHECK_API_SUPPORTED(API) \ if (WinUSBX[sub_api].API == NULL) \ { \ usbi_dbg(#API " isn't available"); \ return LIBUSB_ERROR_NOT_SUPPORTED; \ } // Depending on the version of Microsoft WinUSB, isochronous transfers may not be supported. WINUSBX_CHECK_API_SUPPORTED(RegisterIsochBuffer); WINUSBX_CHECK_API_SUPPORTED(ReadIsochPipeAsap); WINUSBX_CHECK_API_SUPPORTED(WriteIsochPipeAsap); WINUSBX_CHECK_API_SUPPORTED(UnregisterIsochBuffer); WINUSBX_CHECK_API_SUPPORTED(QueryPipeEx); if (sizeof(struct libusb_iso_packet_descriptor) != sizeof(USBD_ISO_PACKET_DESCRIPTOR)) { usbi_dbg("The size of Microsoft WinUsb and libusb isochronous packet descriptor doesn't match."); return LIBUSB_ERROR_NOT_SUPPORTED; } // Query the pipe extended information to find the pipe index corresponding to the endpoint. for (idx = 0; idx < priv->usb_interface[current_interface].nb_endpoints; ++idx) { ret = WinUSBX[sub_api].QueryPipeEx(winusb_handle, (UINT8)priv->usb_interface[current_interface].current_altsetting, (UCHAR)idx, &pipe_info_ex); if (!ret) { usbi_dbg("Couldn't query interface settings for USB pipe with index %d. Error: %s", idx, windows_error_str(0)); return LIBUSB_ERROR_NOT_FOUND; } if (pipe_info_ex.PipeId == transfer->endpoint && pipe_info_ex.PipeType == UsbdPipeTypeIsochronous) { break; } } // Make sure we found the index. if (idx >= priv->usb_interface[current_interface].nb_endpoints) { usbi_dbg("Couldn't find the isochronous endpoint %02x.", transfer->endpoint); return LIBUSB_ERROR_NOT_FOUND; } if (IS_XFERIN(transfer)) { int interval = pipe_info_ex.Interval; // For high-speed and SuperSpeed device, the interval is 2**(bInterval-1). if (libusb_get_device_speed(libusb_get_device(transfer->dev_handle)) >= LIBUSB_SPEED_HIGH) { interval = (1 << (pipe_info_ex.Interval - 1)); } // WinUSB only supports isochronous transfers spanning a full USB frames. Later, we might be smarter about this // and allocate a temporary buffer. However, this is harder than it seems as its destruction would depend on overlapped // IO... iso_transfer_size_multiple = (pipe_info_ex.MaximumBytesPerInterval * 8) / interval; if (transfer->length % iso_transfer_size_multiple != 0) { usbi_dbg("The length of isochronous buffer must be a multiple of the MaximumBytesPerInterval * 8 / Interval"); return LIBUSB_ERROR_INVALID_PARAM; } } else { // If this is an OUT transfer, we make sure the isochronous packets are contiguous as this isn't supported otherwise. BOOL size_should_be_zero = FALSE; out_transfer_length = 0; for (idx = 0; idx < transfer->num_iso_packets; ++idx) { if ((size_should_be_zero && transfer->iso_packet_desc[idx].length != 0) || (transfer->iso_packet_desc[idx].length != pipe_info_ex.MaximumBytesPerInterval && idx + 1 < transfer->num_iso_packets && transfer->iso_packet_desc[idx + 1].length > 0)) { usbi_dbg("Isochronous packets for OUT transfer with Microsoft WinUSB must be contiguous in memory."); return LIBUSB_ERROR_INVALID_PARAM; } size_should_be_zero = (transfer->iso_packet_desc[idx].length == 0); out_transfer_length += transfer->iso_packet_desc[idx].length; } } if (transfer_priv->isoch_buffer_handle != NULL) { if (WinUSBX[sub_api].UnregisterIsochBuffer(transfer_priv->isoch_buffer_handle)) { transfer_priv->isoch_buffer_handle = NULL; } else { usbi_dbg("Couldn't unregister the Microsoft WinUSB isochronous buffer: %s", windows_error_str(0)); return LIBUSB_ERROR_OTHER; } } // Register the isochronous buffer to the operating system. ret = WinUSBX[sub_api].RegisterIsochBuffer(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, &buffer_handle); if (!ret) { usbi_dbg("Microsoft WinUSB refused to allocate an isochronous buffer."); return LIBUSB_ERROR_NO_MEM; } // Important note: the WinUSB_Read/WriteIsochPipeAsap API requires a ContinueStream parameter that tells whether the isochronous // stream must be continued or if the WinUSB driver can schedule the transfer at its conveniance. Profiling subsequent transfers // with ContinueStream = FALSE showed that 5 frames, i.e. about 5 milliseconds, were left empty between each transfer. This // is critical as this greatly diminish the achievable isochronous bandwidth. We solved the problem using the following strategy: // - Transfers are first scheduled with ContinueStream = TRUE and with winusbx_iso_transfer_continue_stream_callback as user callback. // - If the transfer succeeds, winusbx_iso_transfer_continue_stream_callback restore the user callback and calls its. // - If the transfer fails, winusbx_iso_transfer_continue_stream_callback reschedule the transfer and force ContinueStream = FALSE. if (!transfer_priv->iso_break_stream) { transfer_priv->iso_user_callback = transfer->callback; transfer->callback = winusbx_native_iso_transfer_continue_stream_callback; } // Initiate the transfers. if (IS_XFERIN(transfer)) { 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); } else { ret = WinUSBX[sub_api].WriteIsochPipeAsap(buffer_handle, 0, out_transfer_length, !transfer_priv->iso_break_stream, overlapped); } // Restore the ContinueStream parameter to TRUE. transfer_priv->iso_break_stream = FALSE; if (!ret) { if (GetLastError() == ERROR_IO_PENDING) { transfer_priv->isoch_buffer_handle = buffer_handle; } else { usbi_err(ctx, "ReadIsochPipeAsap/WriteIsochPipeAsap failed: %s", windows_error_str(0)); if (WinUSBX[sub_api].UnregisterIsochBuffer(buffer_handle)) { transfer_priv->isoch_buffer_handle = NULL; return LIBUSB_ERROR_IO; } else { usbi_dbg("Couldn't unregister the Microsoft WinUSB isochronous buffer: %s", windows_error_str(0)); return LIBUSB_ERROR_OTHER; } } } else { windows_force_sync_completion(overlapped, (ULONG)transfer->length); if (!WinUSBX[sub_api].UnregisterIsochBuffer(buffer_handle)) { usbi_dbg("Couldn't unregister the Microsoft WinUSB isochronous buffer: %s", windows_error_str(0)); return LIBUSB_ERROR_OTHER; } } transfer_priv->interface_number = (uint8_t)current_interface; return LIBUSB_SUCCESS; } else { PRINT_UNSUPPORTED_API(winusbx_submit_iso_transfer); return LIBUSB_ERROR_NOT_SUPPORTED; } } static int winusbx_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); HANDLE winusb_handle; OVERLAPPED *overlapped; bool ret; int current_interface; CHECK_WINUSBX_AVAILABLE(sub_api); current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint); if (current_interface < 0) { usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer"); return LIBUSB_ERROR_NOT_FOUND; } usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface); transfer_priv->handle = winusb_handle = handle_priv->interface_handle[current_interface].api_handle; overlapped = transfer_priv->pollable_fd.overlapped; if (IS_XFERIN(transfer)) { usbi_dbg("reading %d bytes", transfer->length); ret = WinUSBX[sub_api].ReadPipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, NULL, overlapped); } else { usbi_dbg("writing %d bytes", transfer->length); ret = WinUSBX[sub_api].WritePipe(winusb_handle, transfer->endpoint, transfer->buffer, transfer->length, NULL, overlapped); } if (!ret) { if (GetLastError() != ERROR_IO_PENDING) { usbi_err(ctx, "ReadPipe/WritePipe failed: %s", windows_error_str(0)); return LIBUSB_ERROR_IO; } } else { windows_force_sync_completion(overlapped, (ULONG)transfer->length); } transfer_priv->interface_number = (uint8_t)current_interface; return LIBUSB_SUCCESS; } static int winusbx_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); HANDLE winusb_handle; int current_interface; CHECK_WINUSBX_AVAILABLE(sub_api); current_interface = interface_by_endpoint(priv, handle_priv, endpoint); if (current_interface < 0) { usbi_err(ctx, "unable to match endpoint to an open interface - cannot clear"); return LIBUSB_ERROR_NOT_FOUND; } usbi_dbg("matched endpoint %02X with interface %d", endpoint, current_interface); winusb_handle = handle_priv->interface_handle[current_interface].api_handle; if (!WinUSBX[sub_api].ResetPipe(winusb_handle, endpoint)) { usbi_err(ctx, "ResetPipe failed: %s", windows_error_str(0)); return LIBUSB_ERROR_NO_DEVICE; } return LIBUSB_SUCCESS; } /* * from http://www.winvistatips.com/winusb-bugchecks-t335323.html (confirmed * through testing as well): * "You can not call WinUsb_AbortPipe on control pipe. You can possibly cancel * the control transfer using CancelIo" */ static int winusbx_abort_control(int sub_api, struct usbi_transfer *itransfer) { // Cancelling of the I/O is done in the parent return LIBUSB_SUCCESS; } static int winusbx_abort_transfers(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); HANDLE handle; int current_interface; CHECK_WINUSBX_AVAILABLE(sub_api); current_interface = transfer_priv->interface_number; if ((current_interface < 0) || (current_interface >= USB_MAXINTERFACES)) { usbi_err(ctx, "program assertion failed: invalid interface_number"); return LIBUSB_ERROR_NOT_FOUND; } usbi_dbg("will use interface %d", current_interface); if (WinUSBX[sub_api].CancelIoEx_supported) { // Try to use CancelIoEx if available to cancel just a single transfer handle = handle_priv->interface_handle[current_interface].dev_handle; if (pCancelIoEx(handle, transfer_priv->pollable_fd.overlapped)) return LIBUSB_SUCCESS; else if (GetLastError() == ERROR_NOT_FOUND) return LIBUSB_ERROR_NOT_FOUND; // Not every driver implements the necessary functionality for CancelIoEx usbi_warn(ctx, "CancelIoEx not supported for sub API %s", winusbx_driver_names[sub_api]); WinUSBX[sub_api].CancelIoEx_supported = false; } handle = handle_priv->interface_handle[current_interface].api_handle; if (!WinUSBX[sub_api].AbortPipe(handle, transfer->endpoint)) { usbi_err(ctx, "AbortPipe failed: %s", windows_error_str(0)); return LIBUSB_ERROR_NO_DEVICE; } return LIBUSB_SUCCESS; } /* * from the "How to Use WinUSB to Communicate with a USB Device" Microsoft white paper * (http://www.microsoft.com/whdc/connect/usb/winusb_howto.mspx): * "WinUSB does not support host-initiated reset port and cycle port operations" and * IOCTL_INTERNAL_USB_CYCLE_PORT is only available in kernel mode and the * IOCTL_USB_HUB_CYCLE_PORT ioctl was removed from Vista => the best we can do is * cycle the pipes (and even then, the control pipe can not be reset using WinUSB) */ // TODO: (post hotplug): see if we can force eject the device and redetect it (reuse hotplug?) static int winusbx_reset_device(int sub_api, struct libusb_device_handle *dev_handle) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); HANDLE winusb_handle; int i, j; CHECK_WINUSBX_AVAILABLE(sub_api); // Reset any available pipe (except control) for (i = 0; i < USB_MAXINTERFACES; i++) { winusb_handle = handle_priv->interface_handle[i].api_handle; if (HANDLE_VALID(winusb_handle)) { for (j = 0; j < priv->usb_interface[i].nb_endpoints; j++) { usbi_dbg("resetting ep %02X", priv->usb_interface[i].endpoint[j]); if (!WinUSBX[sub_api].AbortPipe(winusb_handle, priv->usb_interface[i].endpoint[j])) usbi_err(ctx, "AbortPipe (pipe address %02X) failed: %s", priv->usb_interface[i].endpoint[j], windows_error_str(0)); // FlushPipe seems to fail on OUT pipes if (IS_EPIN(priv->usb_interface[i].endpoint[j]) && (!WinUSBX[sub_api].FlushPipe(winusb_handle, priv->usb_interface[i].endpoint[j]))) usbi_err(ctx, "FlushPipe (pipe address %02X) failed: %s", priv->usb_interface[i].endpoint[j], windows_error_str(0)); if (!WinUSBX[sub_api].ResetPipe(winusb_handle, priv->usb_interface[i].endpoint[j])) usbi_err(ctx, "ResetPipe (pipe address %02X) failed: %s", priv->usb_interface[i].endpoint[j], windows_error_str(0)); } } } // libusbK & libusb0 have the ability to issue an actual device reset if (WinUSBX[sub_api].ResetDevice != NULL) { winusb_handle = handle_priv->interface_handle[0].api_handle; if (HANDLE_VALID(winusb_handle)) WinUSBX[sub_api].ResetDevice(winusb_handle); } return LIBUSB_SUCCESS; } static int winusbx_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); PKISO_CONTEXT iso_context; int i; if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS) { CHECK_WINUSBX_AVAILABLE(sub_api); // for isochronous, need to copy the individual iso packet actual_lengths and statuses if ((sub_api == SUB_API_LIBUSBK) || (sub_api == SUB_API_LIBUSB0)) { // iso only supported on libusbk-based backends for now iso_context = transfer_priv->iso_context; for (i = 0; i < transfer->num_iso_packets; i++) { transfer->iso_packet_desc[i].actual_length = iso_context->IsoPackets[i].actual_length; // TODO translate USDB_STATUS codes http://msdn.microsoft.com/en-us/library/ff539136(VS.85).aspx to libusb_transfer_status //transfer->iso_packet_desc[i].status = transfer_priv->iso_context->IsoPackets[i].status; } } else if (sub_api == SUB_API_WINUSB) { if (IS_XFERIN(transfer)) { /* Convert isochronous packet descriptor between Windows and libusb representation. * Both representation are guaranteed to have the same length in bytes.*/ PUSBD_ISO_PACKET_DESCRIPTOR usbd_iso_packet_desc = (PUSBD_ISO_PACKET_DESCRIPTOR)transfer->iso_packet_desc; for (i = 0; i < transfer->num_iso_packets; ++i) { int 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; int actual_length = usbd_iso_packet_desc[i].Length; USBD_STATUS status = usbd_iso_packet_desc[i].Status; transfer->iso_packet_desc[i].length = length; transfer->iso_packet_desc[i].actual_length = actual_length; transfer->iso_packet_desc[i].status = usbd_status_to_libusb_transfer_status(status); } } else { for (i = 0; i < transfer->num_iso_packets; ++i) { transfer->iso_packet_desc[i].status = LIBUSB_TRANSFER_COMPLETED; } } } else { // This should only occur if backend is not set correctly or other backend isoc is partially implemented PRINT_UNSUPPORTED_API(copy_transfer_data); return LIBUSB_ERROR_NOT_SUPPORTED; } } itransfer->transferred += io_size; return LIBUSB_TRANSFER_COMPLETED; } /* * Internal HID Support functions (from libusb-win32) * Note that functions that complete data transfer synchronously must return * LIBUSB_COMPLETED instead of LIBUSB_SUCCESS */ static int _hid_get_hid_descriptor(struct hid_device_priv *dev, void *data, size_t *size); static int _hid_get_report_descriptor(struct hid_device_priv *dev, void *data, size_t *size); static int _hid_wcslen(WCHAR *str) { int i = 0; while (str[i] && (str[i] != 0x409)) i++; return i; } static int _hid_get_device_descriptor(struct hid_device_priv *dev, void *data, size_t *size) { struct libusb_device_descriptor d; d.bLength = LIBUSB_DT_DEVICE_SIZE; d.bDescriptorType = LIBUSB_DT_DEVICE; d.bcdUSB = 0x0200; /* 2.00 */ d.bDeviceClass = 0; d.bDeviceSubClass = 0; d.bDeviceProtocol = 0; d.bMaxPacketSize0 = 64; /* fix this! */ d.idVendor = (uint16_t)dev->vid; d.idProduct = (uint16_t)dev->pid; d.bcdDevice = 0x0100; d.iManufacturer = dev->string_index[0]; d.iProduct = dev->string_index[1]; d.iSerialNumber = dev->string_index[2]; d.bNumConfigurations = 1; if (*size > LIBUSB_DT_DEVICE_SIZE) *size = LIBUSB_DT_DEVICE_SIZE; memcpy(data, &d, *size); return LIBUSB_COMPLETED; } static int _hid_get_config_descriptor(struct hid_device_priv *dev, void *data, size_t *size) { char num_endpoints = 0; size_t config_total_len = 0; char tmp[HID_MAX_CONFIG_DESC_SIZE]; struct libusb_config_descriptor *cd; struct libusb_interface_descriptor *id; struct libusb_hid_descriptor *hd; struct libusb_endpoint_descriptor *ed; size_t tmp_size; if (dev->input_report_size) num_endpoints++; if (dev->output_report_size) num_endpoints++; config_total_len = LIBUSB_DT_CONFIG_SIZE + LIBUSB_DT_INTERFACE_SIZE + LIBUSB_DT_HID_SIZE + num_endpoints * LIBUSB_DT_ENDPOINT_SIZE; cd = (struct libusb_config_descriptor *)tmp; id = (struct libusb_interface_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE); hd = (struct libusb_hid_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE + LIBUSB_DT_INTERFACE_SIZE); ed = (struct libusb_endpoint_descriptor *)(tmp + LIBUSB_DT_CONFIG_SIZE + LIBUSB_DT_INTERFACE_SIZE + LIBUSB_DT_HID_SIZE); cd->bLength = LIBUSB_DT_CONFIG_SIZE; cd->bDescriptorType = LIBUSB_DT_CONFIG; cd->wTotalLength = (uint16_t)config_total_len; cd->bNumInterfaces = 1; cd->bConfigurationValue = 1; cd->iConfiguration = 0; cd->bmAttributes = 1 << 7; /* bus powered */ cd->MaxPower = 50; id->bLength = LIBUSB_DT_INTERFACE_SIZE; id->bDescriptorType = LIBUSB_DT_INTERFACE; id->bInterfaceNumber = 0; id->bAlternateSetting = 0; id->bNumEndpoints = num_endpoints; id->bInterfaceClass = 3; id->bInterfaceSubClass = 0; id->bInterfaceProtocol = 0; id->iInterface = 0; tmp_size = LIBUSB_DT_HID_SIZE; _hid_get_hid_descriptor(dev, hd, &tmp_size); if (dev->input_report_size) { ed->bLength = LIBUSB_DT_ENDPOINT_SIZE; ed->bDescriptorType = LIBUSB_DT_ENDPOINT; ed->bEndpointAddress = HID_IN_EP; ed->bmAttributes = 3; ed->wMaxPacketSize = dev->input_report_size - 1; ed->bInterval = 10; ed = (struct libusb_endpoint_descriptor *)((char *)ed + LIBUSB_DT_ENDPOINT_SIZE); } if (dev->output_report_size) { ed->bLength = LIBUSB_DT_ENDPOINT_SIZE; ed->bDescriptorType = LIBUSB_DT_ENDPOINT; ed->bEndpointAddress = HID_OUT_EP; ed->bmAttributes = 3; ed->wMaxPacketSize = dev->output_report_size - 1; ed->bInterval = 10; } if (*size > config_total_len) *size = config_total_len; memcpy(data, tmp, *size); return LIBUSB_COMPLETED; } static int _hid_get_string_descriptor(struct hid_device_priv *dev, int _index, void *data, size_t *size, HANDLE hid_handle) { void *tmp = NULL; WCHAR string[MAX_USB_STRING_LENGTH]; size_t tmp_size = 0; int i; /* language ID, EN-US */ char string_langid[] = {0x09, 0x04}; if ((*size < 2) || (*size > 255)) return LIBUSB_ERROR_OVERFLOW; if (_index == 0) { tmp = string_langid; tmp_size = sizeof(string_langid) + 2; } else { for (i = 0; i < 3; i++) { if (_index == (dev->string_index[i])) { tmp = dev->string[i]; tmp_size = (_hid_wcslen(dev->string[i]) + 1) * sizeof(WCHAR); break; } } if (i == 3) { if (!HidD_GetIndexedString(hid_handle, _index, string, sizeof(string))) return LIBUSB_ERROR_INVALID_PARAM; tmp = string; tmp_size = (_hid_wcslen(string) + 1) * sizeof(WCHAR); } } if (!tmp_size) return LIBUSB_ERROR_INVALID_PARAM; if (tmp_size < *size) *size = tmp_size; // 2 byte header ((uint8_t *)data)[0] = (uint8_t)*size; ((uint8_t *)data)[1] = LIBUSB_DT_STRING; memcpy((uint8_t *)data + 2, tmp, *size - 2); return LIBUSB_COMPLETED; } static int _hid_get_hid_descriptor(struct hid_device_priv *dev, void *data, size_t *size) { struct libusb_hid_descriptor d; uint8_t tmp[MAX_HID_DESCRIPTOR_SIZE]; size_t report_len = MAX_HID_DESCRIPTOR_SIZE; _hid_get_report_descriptor(dev, tmp, &report_len); d.bLength = LIBUSB_DT_HID_SIZE; d.bDescriptorType = LIBUSB_DT_HID; d.bcdHID = 0x0110; /* 1.10 */ d.bCountryCode = 0; d.bNumDescriptors = 1; d.bClassDescriptorType = LIBUSB_DT_REPORT; d.wClassDescriptorLength = (uint16_t)report_len; if (*size > LIBUSB_DT_HID_SIZE) *size = LIBUSB_DT_HID_SIZE; memcpy(data, &d, *size); return LIBUSB_COMPLETED; } static int _hid_get_report_descriptor(struct hid_device_priv *dev, void *data, size_t *size) { uint8_t d[MAX_HID_DESCRIPTOR_SIZE]; size_t i = 0; /* usage page */ d[i++] = 0x06; d[i++] = dev->usagePage & 0xFF; d[i++] = dev->usagePage >> 8; /* usage */ d[i++] = 0x09; d[i++] = (uint8_t)dev->usage; /* start collection (application) */ d[i++] = 0xA1; d[i++] = 0x01; /* input report */ if (dev->input_report_size) { /* usage (vendor defined) */ d[i++] = 0x09; d[i++] = 0x01; /* logical minimum (0) */ d[i++] = 0x15; d[i++] = 0x00; /* logical maximum (255) */ d[i++] = 0x25; d[i++] = 0xFF; /* report size (8 bits) */ d[i++] = 0x75; d[i++] = 0x08; /* report count */ d[i++] = 0x95; d[i++] = (uint8_t)dev->input_report_size - 1; /* input (data, variable, absolute) */ d[i++] = 0x81; d[i++] = 0x00; } /* output report */ if (dev->output_report_size) { /* usage (vendor defined) */ d[i++] = 0x09; d[i++] = 0x02; /* logical minimum (0) */ d[i++] = 0x15; d[i++] = 0x00; /* logical maximum (255) */ d[i++] = 0x25; d[i++] = 0xFF; /* report size (8 bits) */ d[i++] = 0x75; d[i++] = 0x08; /* report count */ d[i++] = 0x95; d[i++] = (uint8_t)dev->output_report_size - 1; /* output (data, variable, absolute) */ d[i++] = 0x91; d[i++] = 0x00; } /* feature report */ if (dev->feature_report_size) { /* usage (vendor defined) */ d[i++] = 0x09; d[i++] = 0x03; /* logical minimum (0) */ d[i++] = 0x15; d[i++] = 0x00; /* logical maximum (255) */ d[i++] = 0x25; d[i++] = 0xFF; /* report size (8 bits) */ d[i++] = 0x75; d[i++] = 0x08; /* report count */ d[i++] = 0x95; d[i++] = (uint8_t)dev->feature_report_size - 1; /* feature (data, variable, absolute) */ d[i++] = 0xb2; d[i++] = 0x02; d[i++] = 0x01; } /* end collection */ d[i++] = 0xC0; if (*size > i) *size = i; memcpy(data, d, *size); return LIBUSB_COMPLETED; } static int _hid_get_descriptor(struct hid_device_priv *dev, HANDLE hid_handle, int recipient, int type, int _index, void *data, size_t *size) { switch (type) { case LIBUSB_DT_DEVICE: usbi_dbg("LIBUSB_DT_DEVICE"); return _hid_get_device_descriptor(dev, data, size); case LIBUSB_DT_CONFIG: usbi_dbg("LIBUSB_DT_CONFIG"); if (!_index) return _hid_get_config_descriptor(dev, data, size); return LIBUSB_ERROR_INVALID_PARAM; case LIBUSB_DT_STRING: usbi_dbg("LIBUSB_DT_STRING"); return _hid_get_string_descriptor(dev, _index, data, size, hid_handle); case LIBUSB_DT_HID: usbi_dbg("LIBUSB_DT_HID"); if (!_index) return _hid_get_hid_descriptor(dev, data, size); return LIBUSB_ERROR_INVALID_PARAM; case LIBUSB_DT_REPORT: usbi_dbg("LIBUSB_DT_REPORT"); if (!_index) return _hid_get_report_descriptor(dev, data, size); return LIBUSB_ERROR_INVALID_PARAM; case LIBUSB_DT_PHYSICAL: usbi_dbg("LIBUSB_DT_PHYSICAL"); if (HidD_GetPhysicalDescriptor(hid_handle, data, (ULONG)*size)) return LIBUSB_COMPLETED; return LIBUSB_ERROR_OTHER; } usbi_dbg("unsupported"); return LIBUSB_ERROR_NOT_SUPPORTED; } static int _hid_get_report(struct hid_device_priv *dev, HANDLE hid_handle, int id, void *data, struct winusb_transfer_priv *tp, size_t *size, OVERLAPPED *overlapped, int report_type) { uint8_t *buf; DWORD ioctl_code, read_size, expected_size = (DWORD)*size; int r = LIBUSB_SUCCESS; if (tp->hid_buffer != NULL) usbi_dbg("program assertion failed: hid_buffer is not NULL"); if ((*size == 0) || (*size > MAX_HID_REPORT_SIZE)) { usbi_dbg("invalid size (%zu)", *size); return LIBUSB_ERROR_INVALID_PARAM; } switch (report_type) { case HID_REPORT_TYPE_INPUT: ioctl_code = IOCTL_HID_GET_INPUT_REPORT; break; case HID_REPORT_TYPE_FEATURE: ioctl_code = IOCTL_HID_GET_FEATURE; break; default: usbi_dbg("unknown HID report type %d", report_type); return LIBUSB_ERROR_INVALID_PARAM; } // Add a trailing byte to detect overflows buf = calloc(1, expected_size + 1); if (buf == NULL) return LIBUSB_ERROR_NO_MEM; buf[0] = (uint8_t)id; // Must be set always usbi_dbg("report ID: 0x%02X", buf[0]); tp->hid_expected_size = expected_size; read_size = expected_size; // NB: The size returned by DeviceIoControl doesn't include report IDs when not in use (0) if (!DeviceIoControl(hid_handle, ioctl_code, buf, expected_size + 1, buf, expected_size + 1, &read_size, overlapped)) { if (GetLastError() != ERROR_IO_PENDING) { usbi_dbg("Failed to Read HID Report: %s", windows_error_str(0)); free(buf); return LIBUSB_ERROR_IO; } // Asynchronous wait tp->hid_buffer = buf; tp->hid_dest = data; // copy dest, as not necessarily the start of the transfer buffer return LIBUSB_SUCCESS; } // Transfer completed synchronously => copy and discard extra buffer if (read_size == 0) { usbi_warn(NULL, "program assertion failed - read completed synchronously, but no data was read"); *size = 0; } else { if (buf[0] != id) usbi_warn(NULL, "mismatched report ID (data is %02X, parameter is %02X)", buf[0], id); if ((size_t)read_size > expected_size) { r = LIBUSB_ERROR_OVERFLOW; usbi_dbg("OVERFLOW!"); } else { r = LIBUSB_COMPLETED; } *size = MIN((size_t)read_size, *size); if (id == 0) memcpy(data, buf + 1, *size); // Discard report ID else memcpy(data, buf, *size); } free(buf); return r; } static int _hid_set_report(struct hid_device_priv *dev, HANDLE hid_handle, int id, void *data, struct winusb_transfer_priv *tp, size_t *size, OVERLAPPED *overlapped, int report_type) { uint8_t *buf = NULL; DWORD ioctl_code, write_size = (DWORD)*size; // If an id is reported, we must allow MAX_HID_REPORT_SIZE + 1 size_t max_report_size = MAX_HID_REPORT_SIZE + (id ? 1 : 0); if (tp->hid_buffer != NULL) usbi_dbg("program assertion failed: hid_buffer is not NULL"); if ((*size == 0) || (*size > max_report_size)) { usbi_dbg("invalid size (%zu)", *size); return LIBUSB_ERROR_INVALID_PARAM; } switch (report_type) { case HID_REPORT_TYPE_OUTPUT: ioctl_code = IOCTL_HID_SET_OUTPUT_REPORT; break; case HID_REPORT_TYPE_FEATURE: ioctl_code = IOCTL_HID_SET_FEATURE; break; default: usbi_dbg("unknown HID report type %d", report_type); return LIBUSB_ERROR_INVALID_PARAM; } usbi_dbg("report ID: 0x%02X", id); // When report IDs are not used (i.e. when id == 0), we must add // a null report ID. Otherwise, we just use original data buffer if (id == 0) write_size++; buf = malloc(write_size); if (buf == NULL) return LIBUSB_ERROR_NO_MEM; if (id == 0) { buf[0] = 0; memcpy(buf + 1, data, *size); } else { // This seems like a waste, but if we don't duplicate the // data, we'll get issues when freeing hid_buffer memcpy(buf, data, *size); if (buf[0] != id) usbi_warn(NULL, "mismatched report ID (data is %02X, parameter is %02X)", buf[0], id); } // NB: The size returned by DeviceIoControl doesn't include report IDs when not in use (0) if (!DeviceIoControl(hid_handle, ioctl_code, buf, write_size, buf, write_size, &write_size, overlapped)) { if (GetLastError() != ERROR_IO_PENDING) { usbi_dbg("Failed to Write HID Output Report: %s", windows_error_str(0)); free(buf); return LIBUSB_ERROR_IO; } tp->hid_buffer = buf; tp->hid_dest = NULL; return LIBUSB_SUCCESS; } // Transfer completed synchronously *size = write_size; if (write_size == 0) usbi_dbg("program assertion failed - write completed synchronously, but no data was written"); free(buf); return LIBUSB_COMPLETED; } static int _hid_class_request(struct hid_device_priv *dev, HANDLE hid_handle, int request_type, int request, int value, int _index, void *data, struct winusb_transfer_priv *tp, size_t *size, OVERLAPPED *overlapped) { int report_type = (value >> 8) & 0xFF; int report_id = value & 0xFF; if ((LIBUSB_REQ_RECIPIENT(request_type) != LIBUSB_RECIPIENT_INTERFACE) && (LIBUSB_REQ_RECIPIENT(request_type) != LIBUSB_RECIPIENT_DEVICE)) return LIBUSB_ERROR_INVALID_PARAM; if (LIBUSB_REQ_OUT(request_type) && request == HID_REQ_SET_REPORT) return _hid_set_report(dev, hid_handle, report_id, data, tp, size, overlapped, report_type); if (LIBUSB_REQ_IN(request_type) && request == HID_REQ_GET_REPORT) return _hid_get_report(dev, hid_handle, report_id, data, tp, size, overlapped, report_type); return LIBUSB_ERROR_INVALID_PARAM; } /* * HID API functions */ static int hid_init(struct libusb_context *ctx) { DLL_GET_HANDLE(hid); DLL_LOAD_FUNC(hid, HidD_GetAttributes, TRUE); DLL_LOAD_FUNC(hid, HidD_GetHidGuid, TRUE); DLL_LOAD_FUNC(hid, HidD_GetPreparsedData, TRUE); DLL_LOAD_FUNC(hid, HidD_FreePreparsedData, TRUE); DLL_LOAD_FUNC(hid, HidD_GetManufacturerString, TRUE); DLL_LOAD_FUNC(hid, HidD_GetProductString, TRUE); DLL_LOAD_FUNC(hid, HidD_GetSerialNumberString, TRUE); DLL_LOAD_FUNC(hid, HidD_GetIndexedString, TRUE); DLL_LOAD_FUNC(hid, HidP_GetCaps, TRUE); DLL_LOAD_FUNC(hid, HidD_SetNumInputBuffers, TRUE); DLL_LOAD_FUNC(hid, HidD_GetPhysicalDescriptor, TRUE); DLL_LOAD_FUNC(hid, HidD_FlushQueue, TRUE); DLL_LOAD_FUNC(hid, HidP_GetValueCaps, TRUE); api_hid_available = true; return LIBUSB_SUCCESS; } static void hid_exit(void) { DLL_FREE_HANDLE(hid); } // NB: open and close must ensure that they only handle interface of // the right API type, as these functions can be called wholesale from // composite_open(), with interfaces belonging to different APIs static int hid_open(int sub_api, struct libusb_device_handle *dev_handle) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); HIDD_ATTRIBUTES hid_attributes; PHIDP_PREPARSED_DATA preparsed_data = NULL; HIDP_CAPS capabilities; HIDP_VALUE_CAPS *value_caps; HANDLE hid_handle = INVALID_HANDLE_VALUE; int i, j; // report IDs handling ULONG size[3]; int nb_ids[2]; // zero and nonzero report IDs #if defined(ENABLE_LOGGING) const char * const type[3] = {"input", "output", "feature"}; #endif CHECK_HID_AVAILABLE; if (priv->hid == NULL) { usbi_err(ctx, "program assertion failed - private HID structure is unitialized"); return LIBUSB_ERROR_NOT_FOUND; } for (i = 0; i < USB_MAXINTERFACES; i++) { if ((priv->usb_interface[i].path != NULL) && (priv->usb_interface[i].apib->id == USB_API_HID)) { hid_handle = CreateFileA(priv->usb_interface[i].path, GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL); /* * http://www.lvr.com/hidfaq.htm: Why do I receive "Access denied" when attempting to access my HID? * "Windows 2000 and later have exclusive read/write access to HIDs that are configured as a system * keyboards or mice. An application can obtain a handle to a system keyboard or mouse by not * requesting READ or WRITE access with CreateFile. Applications can then use HidD_SetFeature and * HidD_GetFeature (if the device supports Feature reports)." */ if (hid_handle == INVALID_HANDLE_VALUE) { usbi_warn(ctx, "could not open HID device in R/W mode (keyboard or mouse?) - trying without"); hid_handle = CreateFileA(priv->usb_interface[i].path, 0, FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, NULL); if (hid_handle == INVALID_HANDLE_VALUE) { usbi_err(ctx, "could not open device %s (interface %d): %s", priv->path, i, windows_error_str(0)); switch (GetLastError()) { case ERROR_FILE_NOT_FOUND: // The device was disconnected return LIBUSB_ERROR_NO_DEVICE; case ERROR_ACCESS_DENIED: return LIBUSB_ERROR_ACCESS; default: return LIBUSB_ERROR_IO; } } priv->usb_interface[i].restricted_functionality = true; } handle_priv->interface_handle[i].api_handle = hid_handle; } } hid_attributes.Size = sizeof(hid_attributes); do { if (!HidD_GetAttributes(hid_handle, &hid_attributes)) { usbi_err(ctx, "could not gain access to HID top collection (HidD_GetAttributes)"); break; } priv->hid->vid = hid_attributes.VendorID; priv->hid->pid = hid_attributes.ProductID; // Set the maximum available input buffer size for (i = 32; HidD_SetNumInputBuffers(hid_handle, i); i *= 2); usbi_dbg("set maximum input buffer size to %d", i / 2); // Get the maximum input and output report size if (!HidD_GetPreparsedData(hid_handle, &preparsed_data) || !preparsed_data) { usbi_err(ctx, "could not read HID preparsed data (HidD_GetPreparsedData)"); break; } if (HidP_GetCaps(preparsed_data, &capabilities) != HIDP_STATUS_SUCCESS) { usbi_err(ctx, "could not parse HID capabilities (HidP_GetCaps)"); break; } // Find out if interrupt will need report IDs size[0] = capabilities.NumberInputValueCaps; size[1] = capabilities.NumberOutputValueCaps; size[2] = capabilities.NumberFeatureValueCaps; for (j = HidP_Input; j <= HidP_Feature; j++) { usbi_dbg("%u HID %s report value(s) found", (unsigned int)size[j], type[j]); priv->hid->uses_report_ids[j] = false; if (size[j] > 0) { value_caps = calloc(size[j], sizeof(HIDP_VALUE_CAPS)); if ((value_caps != NULL) && (HidP_GetValueCaps((HIDP_REPORT_TYPE)j, value_caps, &size[j], preparsed_data) == HIDP_STATUS_SUCCESS) && (size[j] >= 1)) { nb_ids[0] = 0; nb_ids[1] = 0; for (i = 0; i < (int)size[j]; i++) { usbi_dbg(" Report ID: 0x%02X", value_caps[i].ReportID); if (value_caps[i].ReportID != 0) nb_ids[1]++; else nb_ids[0]++; } if (nb_ids[1] != 0) { if (nb_ids[0] != 0) usbi_warn(ctx, "program assertion failed: zero and nonzero report IDs used for %s", type[j]); priv->hid->uses_report_ids[j] = true; } } else { usbi_warn(ctx, " could not process %s report IDs", type[j]); } free(value_caps); } } // Set the report sizes priv->hid->input_report_size = capabilities.InputReportByteLength; priv->hid->output_report_size = capabilities.OutputReportByteLength; priv->hid->feature_report_size = capabilities.FeatureReportByteLength; // Store usage and usagePage values priv->hid->usage = capabilities.Usage; priv->hid->usagePage = capabilities.UsagePage; // Fetch string descriptors priv->hid->string_index[0] = priv->dev_descriptor.iManufacturer; if (priv->hid->string_index[0] != 0) HidD_GetManufacturerString(hid_handle, priv->hid->string[0], sizeof(priv->hid->string[0])); else priv->hid->string[0][0] = 0; priv->hid->string_index[1] = priv->dev_descriptor.iProduct; if (priv->hid->string_index[1] != 0) HidD_GetProductString(hid_handle, priv->hid->string[1], sizeof(priv->hid->string[1])); else priv->hid->string[1][0] = 0; priv->hid->string_index[2] = priv->dev_descriptor.iSerialNumber; if (priv->hid->string_index[2] != 0) HidD_GetSerialNumberString(hid_handle, priv->hid->string[2], sizeof(priv->hid->string[2])); else priv->hid->string[2][0] = 0; } while (0); if (preparsed_data) HidD_FreePreparsedData(preparsed_data); return LIBUSB_SUCCESS; } static void hid_close(int sub_api, struct libusb_device_handle *dev_handle) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); HANDLE file_handle; int i; if (!api_hid_available) return; for (i = 0; i < USB_MAXINTERFACES; i++) { if (priv->usb_interface[i].apib->id == USB_API_HID) { file_handle = handle_priv->interface_handle[i].api_handle; if (HANDLE_VALID(file_handle)) CloseHandle(file_handle); } } } static int hid_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface) { struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_HID_AVAILABLE; // NB: Disconnection detection is not possible in this function if (priv->usb_interface[iface].path == NULL) return LIBUSB_ERROR_NOT_FOUND; // invalid iface // We use dev_handle as a flag for interface claimed if (handle_priv->interface_handle[iface].dev_handle == INTERFACE_CLAIMED) return LIBUSB_ERROR_BUSY; // already claimed handle_priv->interface_handle[iface].dev_handle = INTERFACE_CLAIMED; usbi_dbg("claimed interface %d", iface); handle_priv->active_interface = iface; return LIBUSB_SUCCESS; } static int hid_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface) { struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_HID_AVAILABLE; if (priv->usb_interface[iface].path == NULL) return LIBUSB_ERROR_NOT_FOUND; // invalid iface if (handle_priv->interface_handle[iface].dev_handle != INTERFACE_CLAIMED) return LIBUSB_ERROR_NOT_FOUND; // invalid iface handle_priv->interface_handle[iface].dev_handle = INVALID_HANDLE_VALUE; return LIBUSB_SUCCESS; } static int hid_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); CHECK_HID_AVAILABLE; if (altsetting > 255) return LIBUSB_ERROR_INVALID_PARAM; if (altsetting != 0) { usbi_err(ctx, "set interface altsetting not supported for altsetting >0"); return LIBUSB_ERROR_NOT_SUPPORTED; } return LIBUSB_SUCCESS; } static int hid_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); WINUSB_SETUP_PACKET *setup = (WINUSB_SETUP_PACKET *)transfer->buffer; HANDLE hid_handle; OVERLAPPED *overlapped; int current_interface, config; size_t size; int r = LIBUSB_ERROR_INVALID_PARAM; CHECK_HID_AVAILABLE; safe_free(transfer_priv->hid_buffer); transfer_priv->hid_dest = NULL; size = transfer->length - LIBUSB_CONTROL_SETUP_SIZE; if (size > MAX_CTRL_BUFFER_LENGTH) return LIBUSB_ERROR_INVALID_PARAM; current_interface = get_valid_interface(transfer->dev_handle, USB_API_HID); if (current_interface < 0) { if (auto_claim(transfer, ¤t_interface, USB_API_HID) != LIBUSB_SUCCESS) return LIBUSB_ERROR_NOT_FOUND; } usbi_dbg("will use interface %d", current_interface); hid_handle = handle_priv->interface_handle[current_interface].api_handle; overlapped = transfer_priv->pollable_fd.overlapped; switch (LIBUSB_REQ_TYPE(setup->RequestType)) { case LIBUSB_REQUEST_TYPE_STANDARD: switch (setup->Request) { case LIBUSB_REQUEST_GET_DESCRIPTOR: r = _hid_get_descriptor(priv->hid, hid_handle, LIBUSB_REQ_RECIPIENT(setup->RequestType), (setup->Value >> 8) & 0xFF, setup->Value & 0xFF, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, &size); break; case LIBUSB_REQUEST_GET_CONFIGURATION: r = winusb_get_configuration(transfer->dev_handle, &config); if (r == LIBUSB_SUCCESS) { size = 1; ((uint8_t *)transfer->buffer)[LIBUSB_CONTROL_SETUP_SIZE] = (uint8_t)config; r = LIBUSB_COMPLETED; } break; case LIBUSB_REQUEST_SET_CONFIGURATION: if (setup->Value == priv->active_config) { r = LIBUSB_COMPLETED; } else { usbi_warn(ctx, "cannot set configuration other than the default one"); r = LIBUSB_ERROR_NOT_SUPPORTED; } break; case LIBUSB_REQUEST_GET_INTERFACE: size = 1; ((uint8_t *)transfer->buffer)[LIBUSB_CONTROL_SETUP_SIZE] = 0; r = LIBUSB_COMPLETED; break; case LIBUSB_REQUEST_SET_INTERFACE: r = hid_set_interface_altsetting(0, transfer->dev_handle, setup->Index, setup->Value); if (r == LIBUSB_SUCCESS) r = LIBUSB_COMPLETED; break; default: usbi_warn(ctx, "unsupported HID control request"); return LIBUSB_ERROR_NOT_SUPPORTED; } break; case LIBUSB_REQUEST_TYPE_CLASS: r = _hid_class_request(priv->hid, hid_handle, setup->RequestType, setup->Request, setup->Value, setup->Index, transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE, transfer_priv, &size, overlapped); break; default: usbi_warn(ctx, "unsupported HID control request"); return LIBUSB_ERROR_NOT_SUPPORTED; } if (r < 0) return r; if (r == LIBUSB_COMPLETED) { // Force request to be completed synchronously. Transferred size has been set by previous call windows_force_sync_completion(overlapped, (ULONG)size); r = LIBUSB_SUCCESS; } transfer_priv->interface_number = (uint8_t)current_interface; return LIBUSB_SUCCESS; } static int hid_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); HANDLE hid_handle; OVERLAPPED *overlapped; bool direction_in, ret; int current_interface, length; DWORD size; int r = LIBUSB_SUCCESS; CHECK_HID_AVAILABLE; transfer_priv->hid_dest = NULL; safe_free(transfer_priv->hid_buffer); current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint); if (current_interface < 0) { usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer"); return LIBUSB_ERROR_NOT_FOUND; } usbi_dbg("matched endpoint %02X with interface %d", transfer->endpoint, current_interface); transfer_priv->handle = hid_handle = handle_priv->interface_handle[current_interface].api_handle; overlapped = transfer_priv->pollable_fd.overlapped; direction_in = IS_XFERIN(transfer); // If report IDs are not in use, an extra prefix byte must be added if (((direction_in) && (!priv->hid->uses_report_ids[0])) || ((!direction_in) && (!priv->hid->uses_report_ids[1]))) length = transfer->length + 1; else length = transfer->length; // Add a trailing byte to detect overflows on input transfer_priv->hid_buffer = calloc(1, length + 1); if (transfer_priv->hid_buffer == NULL) return LIBUSB_ERROR_NO_MEM; transfer_priv->hid_expected_size = length; if (direction_in) { transfer_priv->hid_dest = transfer->buffer; usbi_dbg("reading %d bytes (report ID: 0x00)", length); ret = ReadFile(hid_handle, transfer_priv->hid_buffer, length + 1, &size, overlapped); } else { if (!priv->hid->uses_report_ids[1]) memcpy(transfer_priv->hid_buffer + 1, transfer->buffer, transfer->length); else // We could actually do without the calloc and memcpy in this case memcpy(transfer_priv->hid_buffer, transfer->buffer, transfer->length); usbi_dbg("writing %d bytes (report ID: 0x%02X)", length, transfer_priv->hid_buffer[0]); ret = WriteFile(hid_handle, transfer_priv->hid_buffer, length, &size, overlapped); } if (!ret) { if (GetLastError() != ERROR_IO_PENDING) { usbi_err(ctx, "HID transfer failed: %s", windows_error_str(0)); safe_free(transfer_priv->hid_buffer); return LIBUSB_ERROR_IO; } } else { // Only write operations that completed synchronously need to free up // hid_buffer. For reads, copy_transfer_data() handles that process. if (!direction_in) safe_free(transfer_priv->hid_buffer); if (size == 0) { usbi_err(ctx, "program assertion failed - no data was transferred"); size = 1; } if (size > (size_t)length) { usbi_err(ctx, "OVERFLOW!"); r = LIBUSB_ERROR_OVERFLOW; } windows_force_sync_completion(overlapped, (ULONG)size); } transfer_priv->interface_number = (uint8_t)current_interface; return r; } static int hid_abort_transfers(int sub_api, struct usbi_transfer *itransfer) { struct libusb_context *ctx = ITRANSFER_CTX(itransfer); struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); HANDLE hid_handle; int current_interface; CHECK_HID_AVAILABLE; current_interface = transfer_priv->interface_number; if ((current_interface < 0) || (current_interface >= USB_MAXINTERFACES)) { usbi_err(ctx, "program assertion failed: invalid interface_number"); return LIBUSB_ERROR_NOT_FOUND; } usbi_dbg("will use interface %d", current_interface); hid_handle = handle_priv->interface_handle[current_interface].api_handle; if (pCancelIoEx != NULL) { // Use CancelIoEx if available to cancel just a single transfer if (pCancelIoEx(hid_handle, transfer_priv->pollable_fd.overlapped)) return LIBUSB_SUCCESS; } else { if (CancelIo(hid_handle)) return LIBUSB_SUCCESS; } usbi_warn(ctx, "cancel failed: %s", windows_error_str(0)); return LIBUSB_ERROR_NOT_FOUND; } static int hid_reset_device(int sub_api, struct libusb_device_handle *dev_handle) { struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); HANDLE hid_handle; int current_interface; CHECK_HID_AVAILABLE; // Flushing the queues on all interfaces is the best we can achieve for (current_interface = 0; current_interface < USB_MAXINTERFACES; current_interface++) { hid_handle = handle_priv->interface_handle[current_interface].api_handle; if (HANDLE_VALID(hid_handle)) HidD_FlushQueue(hid_handle); } return LIBUSB_SUCCESS; } static int hid_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); HANDLE hid_handle; int current_interface; CHECK_HID_AVAILABLE; current_interface = interface_by_endpoint(priv, handle_priv, endpoint); if (current_interface < 0) { usbi_err(ctx, "unable to match endpoint to an open interface - cannot clear"); return LIBUSB_ERROR_NOT_FOUND; } usbi_dbg("matched endpoint %02X with interface %d", endpoint, current_interface); hid_handle = handle_priv->interface_handle[current_interface].api_handle; // No endpoint selection with Microsoft's implementation, so we try to flush the // whole interface. Should be OK for most case scenarios if (!HidD_FlushQueue(hid_handle)) { usbi_err(ctx, "Flushing of HID queue failed: %s", windows_error_str(0)); // Device was probably disconnected return LIBUSB_ERROR_NO_DEVICE; } return LIBUSB_SUCCESS; } // This extra function is only needed for HID static int hid_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); int r = LIBUSB_TRANSFER_COMPLETED; uint32_t corrected_size = io_size; if (transfer_priv->hid_buffer != NULL) { // If we have a valid hid_buffer, it means the transfer was async if (transfer_priv->hid_dest != NULL) { // Data readout if (corrected_size > 0) { // First, check for overflow if (corrected_size > transfer_priv->hid_expected_size) { usbi_err(ctx, "OVERFLOW!"); corrected_size = (uint32_t)transfer_priv->hid_expected_size; r = LIBUSB_TRANSFER_OVERFLOW; } if (transfer_priv->hid_buffer[0] == 0) { // Discard the 1 byte report ID prefix corrected_size--; memcpy(transfer_priv->hid_dest, transfer_priv->hid_buffer + 1, corrected_size); } else { memcpy(transfer_priv->hid_dest, transfer_priv->hid_buffer, corrected_size); } } transfer_priv->hid_dest = NULL; } // For write, we just need to free the hid buffer safe_free(transfer_priv->hid_buffer); } itransfer->transferred += corrected_size; return r; } /* * Composite API functions */ static int composite_open(int sub_api, struct libusb_device_handle *dev_handle) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); int r = LIBUSB_ERROR_NOT_FOUND; uint8_t i; // SUB_API_MAX + 1 as the SUB_API_MAX pos is used to indicate availability of HID bool available[SUB_API_MAX + 1] = { 0 }; for (i = 0; i < USB_MAXINTERFACES; i++) { switch (priv->usb_interface[i].apib->id) { case USB_API_WINUSBX: if (priv->usb_interface[i].sub_api != SUB_API_NOTSET) available[priv->usb_interface[i].sub_api] = true; break; case USB_API_HID: available[SUB_API_MAX] = true; break; default: break; } } for (i = 0; i < SUB_API_MAX; i++) { // WinUSB-like drivers if (available[i]) { r = usb_api_backend[USB_API_WINUSBX].open(i, dev_handle); if (r != LIBUSB_SUCCESS) return r; } } if (available[SUB_API_MAX]) { // HID driver r = hid_open(SUB_API_NOTSET, dev_handle); // On Windows 10 version 1903 (OS Build 18362) and later Windows blocks attempts to // open HID devices with a U2F usage unless running as administrator. We ignore this // failure and proceed without the HID device opened. if (r == LIBUSB_ERROR_ACCESS) { usbi_dbg("ignoring access denied error while opening HID interface of composite device"); r = LIBUSB_SUCCESS; } } return r; } static void composite_close(int sub_api, struct libusb_device_handle *dev_handle) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); uint8_t i; // SUB_API_MAX + 1 as the SUB_API_MAX pos is used to indicate availability of HID bool available[SUB_API_MAX + 1] = { 0 }; for (i = 0; i < USB_MAXINTERFACES; i++) { switch (priv->usb_interface[i].apib->id) { case USB_API_WINUSBX: if (priv->usb_interface[i].sub_api != SUB_API_NOTSET) available[priv->usb_interface[i].sub_api] = true; break; case USB_API_HID: available[SUB_API_MAX] = true; break; default: break; } } for (i = 0; i < SUB_API_MAX; i++) { // WinUSB-like drivers if (available[i]) usb_api_backend[USB_API_WINUSBX].close(i, dev_handle); } if (available[SUB_API_MAX]) // HID driver hid_close(SUB_API_NOTSET, dev_handle); } static int composite_claim_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_SUPPORTED_API(priv->usb_interface[iface].apib, claim_interface); return priv->usb_interface[iface].apib-> claim_interface(priv->usb_interface[iface].sub_api, dev_handle, iface); } static int composite_set_interface_altsetting(int sub_api, struct libusb_device_handle *dev_handle, int iface, int altsetting) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_SUPPORTED_API(priv->usb_interface[iface].apib, set_interface_altsetting); return priv->usb_interface[iface].apib-> set_interface_altsetting(priv->usb_interface[iface].sub_api, dev_handle, iface, altsetting); } static int composite_release_interface(int sub_api, struct libusb_device_handle *dev_handle, int iface) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); CHECK_SUPPORTED_API(priv->usb_interface[iface].apib, release_interface); return priv->usb_interface[iface].apib-> release_interface(priv->usb_interface[iface].sub_api, dev_handle, iface); } static int composite_submit_control_transfer(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); struct libusb_config_descriptor *conf_desc; WINUSB_SETUP_PACKET *setup = (WINUSB_SETUP_PACKET *)transfer->buffer; int iface, pass, r; // Interface shouldn't matter for control, but it does in practice, with Windows' // restrictions with regards to accessing HID keyboards and mice. Try to target // a specific interface first, if possible. switch (LIBUSB_REQ_RECIPIENT(setup->RequestType)) { case LIBUSB_RECIPIENT_INTERFACE: iface = setup->Index & 0xFF; break; case LIBUSB_RECIPIENT_ENDPOINT: r = libusb_get_active_config_descriptor(transfer->dev_handle->dev, &conf_desc); if (r == LIBUSB_SUCCESS) { iface = get_interface_by_endpoint(conf_desc, (setup->Index & 0xFF)); libusb_free_config_descriptor(conf_desc); break; } // Fall through if not able to determine interface default: iface = -1; break; } // Try and target a specific interface if the control setup indicates such if ((iface >= 0) && (iface < USB_MAXINTERFACES)) { usbi_dbg("attempting control transfer targeted to interface %d", iface); if ((priv->usb_interface[iface].path != NULL) && (priv->usb_interface[iface].apib->submit_control_transfer != NULL)) { r = priv->usb_interface[iface].apib->submit_control_transfer(priv->usb_interface[iface].sub_api, itransfer); if (r == LIBUSB_SUCCESS) return r; } } // Either not targeted to a specific interface or no luck in doing so. // Try a 2 pass approach with all interfaces. for (pass = 0; pass < 2; pass++) { for (iface = 0; iface < USB_MAXINTERFACES; iface++) { if ((priv->usb_interface[iface].path != NULL) && (priv->usb_interface[iface].apib->submit_control_transfer != NULL)) { if ((pass == 0) && (priv->usb_interface[iface].restricted_functionality)) { usbi_dbg("trying to skip restricted interface #%d (HID keyboard or mouse?)", iface); continue; } usbi_dbg("using interface %d", iface); r = priv->usb_interface[iface].apib->submit_control_transfer(priv->usb_interface[iface].sub_api, itransfer); // If not supported on this API, it may be supported on another, so don't give up yet!! if (r == LIBUSB_ERROR_NOT_SUPPORTED) continue; return r; } } } usbi_err(ctx, "no libusb supported interfaces to complete request"); return LIBUSB_ERROR_NOT_FOUND; } static int composite_submit_bulk_transfer(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); int current_interface; current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint); if (current_interface < 0) { usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer"); return LIBUSB_ERROR_NOT_FOUND; } CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, submit_bulk_transfer); return priv->usb_interface[current_interface].apib-> submit_bulk_transfer(priv->usb_interface[current_interface].sub_api, itransfer); } static int composite_submit_iso_transfer(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct libusb_context *ctx = DEVICE_CTX(transfer->dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(transfer->dev_handle); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); int current_interface; current_interface = interface_by_endpoint(priv, handle_priv, transfer->endpoint); if (current_interface < 0) { usbi_err(ctx, "unable to match endpoint to an open interface - cancelling transfer"); return LIBUSB_ERROR_NOT_FOUND; } CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, submit_iso_transfer); return priv->usb_interface[current_interface].apib-> submit_iso_transfer(priv->usb_interface[current_interface].sub_api, itransfer); } static int composite_clear_halt(int sub_api, struct libusb_device_handle *dev_handle, unsigned char endpoint) { struct libusb_context *ctx = DEVICE_CTX(dev_handle->dev); struct winusb_device_handle_priv *handle_priv = _device_handle_priv(dev_handle); struct winusb_device_priv *priv = _device_priv(dev_handle->dev); int current_interface; current_interface = interface_by_endpoint(priv, handle_priv, endpoint); if (current_interface < 0) { usbi_err(ctx, "unable to match endpoint to an open interface - cannot clear"); return LIBUSB_ERROR_NOT_FOUND; } CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, clear_halt); return priv->usb_interface[current_interface].apib-> clear_halt(priv->usb_interface[current_interface].sub_api, dev_handle, endpoint); } static int composite_abort_control(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); int current_interface = transfer_priv->interface_number; if ((current_interface < 0) || (current_interface >= USB_MAXINTERFACES)) { usbi_err(TRANSFER_CTX(transfer), "program assertion failed: invalid interface_number"); return LIBUSB_ERROR_NOT_FOUND; } CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, abort_control); return priv->usb_interface[current_interface].apib-> abort_control(priv->usb_interface[current_interface].sub_api, itransfer); } static int composite_abort_transfers(int sub_api, struct usbi_transfer *itransfer) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); int current_interface = transfer_priv->interface_number; if ((current_interface < 0) || (current_interface >= USB_MAXINTERFACES)) { usbi_err(TRANSFER_CTX(transfer), "program assertion failed: invalid interface_number"); return LIBUSB_ERROR_NOT_FOUND; } CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, abort_transfers); return priv->usb_interface[current_interface].apib-> abort_transfers(priv->usb_interface[current_interface].sub_api, itransfer); } static int composite_reset_device(int sub_api, struct libusb_device_handle *dev_handle) { struct winusb_device_priv *priv = _device_priv(dev_handle->dev); int r; uint8_t i; bool available[SUB_API_MAX]; for (i = 0; i < SUB_API_MAX; i++) available[i] = false; for (i = 0; i < USB_MAXINTERFACES; i++) { if ((priv->usb_interface[i].apib->id == USB_API_WINUSBX) && (priv->usb_interface[i].sub_api != SUB_API_NOTSET)) available[priv->usb_interface[i].sub_api] = true; } for (i = 0; i < SUB_API_MAX; i++) { if (available[i]) { r = usb_api_backend[USB_API_WINUSBX].reset_device(i, dev_handle); if (r != LIBUSB_SUCCESS) return r; } } return LIBUSB_SUCCESS; } static int composite_copy_transfer_data(int sub_api, struct usbi_transfer *itransfer, uint32_t io_size) { struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer); struct winusb_transfer_priv *transfer_priv = usbi_transfer_get_os_priv(itransfer); struct winusb_device_priv *priv = _device_priv(transfer->dev_handle->dev); int current_interface = transfer_priv->interface_number; CHECK_SUPPORTED_API(priv->usb_interface[current_interface].apib, copy_transfer_data); return priv->usb_interface[current_interface].apib-> copy_transfer_data(priv->usb_interface[current_interface].sub_api, itransfer, io_size); }