text: /** @file
  
      Manage Usb Descriptor List
  
  Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php
  
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  
  **/
  
  #include "UsbBus.h"
  
  
  /**
    Free the interface setting descriptor.
  
    @param  Setting               The descriptor to free.
  
  **/
  VOID
  UsbFreeInterfaceDesc (
    IN USB_INTERFACE_SETTING  *Setting
    )
  {
    USB_ENDPOINT_DESC       *Ep;
    UINTN                   Index;
  
    if (Setting->Endpoints != NULL) {
      //
      // Each interface setting may have several endpoints, free them first.
      //
      for (Index = 0; Index < Setting->Desc.NumEndpoints; Index++) {
        Ep = Setting->Endpoints[Index];
  
        if (Ep != NULL) {
          FreePool (Ep);
        }
      }
  
      //
      // Only call FreePool() if NumEndpoints > 0.
      //
      if (Setting->Desc.NumEndpoints > 0) {
        FreePool (Setting->Endpoints);
      }
    }
  
    FreePool (Setting);
  }
  
  
  /**
    Free a configuration descriptor with its interface
    descriptors. It may be initialized partially.
  
    @param  Config                The configuration descriptor to free.
  
  **/
  VOID
  UsbFreeConfigDesc (
    IN USB_CONFIG_DESC      *Config
    )
  {
    USB_INTERFACE_DESC      *Interface;
    UINTN                   Index;
    UINTN                   SetIndex;
  
    if (Config->Interfaces != NULL) {
      //
      // A configuration may have several interfaces, free the interface
      //
      for (Index = 0; Index < Config->Desc.NumInterfaces; Index++) {
        Interface = Config->Interfaces[Index];
  
        if (Interface == NULL) {
          continue;
        }
  
        //
        // Each interface may have several settings, free the settings
        //
        for (SetIndex = 0; SetIndex < Interface->NumOfSetting; SetIndex++) {
          if (Interface->Settings[SetIndex] != NULL) {
            UsbFreeInterfaceDesc (Interface->Settings[SetIndex]);
          }
        }
  
        FreePool (Interface);
      }
  
      FreePool (Config->Interfaces);
    }
  
    FreePool (Config);
  
  }
  
  
  /**
    Free a device descriptor with its configurations.
  
    @param  DevDesc               The device descriptor.
  
  **/
  VOID
  UsbFreeDevDesc (
    IN USB_DEVICE_DESC      *DevDesc
    )
  {
    UINTN                   Index;
  
    if (DevDesc->Configs != NULL) {
      for (Index = 0; Index < DevDesc->Desc.NumConfigurations; Index++) {
        if (DevDesc->Configs[Index] != NULL) {
          UsbFreeConfigDesc (DevDesc->Configs[Index]);
        }
      }
  
      FreePool (DevDesc->Configs);
    }
  
    FreePool (DevDesc);
  }
  
  
  /**
    Create a descriptor.
  
    @param  DescBuf               The buffer of raw descriptor.
    @param  Len                   The length of the raw descriptor buffer.
    @param  Type                  The type of descriptor to create.
    @param  Consumed              Number of bytes consumed.
  
    @return Created descriptor or NULL.
  
  **/
  VOID *
  UsbCreateDesc (
    IN  UINT8               *DescBuf,
    IN  UINTN               Len,
    IN  UINT8               Type,
    OUT UINTN               *Consumed
    )
  {
    USB_DESC_HEAD           *Head;
    UINTN                   DescLen;
    UINTN                   CtrlLen;
    UINTN                   Offset;
    VOID                    *Desc;
  
    DescLen   = 0;
    CtrlLen   = 0;
    *Consumed = 0;
  
    switch (Type) {
    case USB_DESC_TYPE_DEVICE:
      DescLen = sizeof (EFI_USB_DEVICE_DESCRIPTOR);
      CtrlLen = sizeof (USB_DEVICE_DESC);
      break;
  
    case USB_DESC_TYPE_CONFIG:
      DescLen = sizeof (EFI_USB_CONFIG_DESCRIPTOR);
      CtrlLen = sizeof (USB_CONFIG_DESC);
      break;
  
    case USB_DESC_TYPE_INTERFACE:
      DescLen = sizeof (EFI_USB_INTERFACE_DESCRIPTOR);
      CtrlLen = sizeof (USB_INTERFACE_SETTING);
      break;
  
    case USB_DESC_TYPE_ENDPOINT:
      DescLen = sizeof (EFI_USB_ENDPOINT_DESCRIPTOR);
      CtrlLen = sizeof (USB_ENDPOINT_DESC);
      break;
    }
  
    //
    // All the descriptor has a common LTV (Length, Type, Value)
    // format. Skip the descriptor that isn't of this Type
    //
    Offset = 0;
    Head   = (USB_DESC_HEAD*)DescBuf;
  
    while ((Offset < Len) && (Head->Type != Type)) {
      Offset += Head->Len;
      if (Len <= Offset) {
        DEBUG (( EFI_D_ERROR, "UsbCreateDesc: met mal-format descriptor, Beyond boundary!\n"));
        return NULL;
      }
      Head    = (USB_DESC_HEAD*)(DescBuf + Offset);
      if (Head->Len == 0) {
        DEBUG (( EFI_D_ERROR, "UsbCreateDesc: met mal-format descriptor, Head->Len = 0!\n"));
        return NULL;
      }
    }
  
    if ((Len <= Offset)      || (Len < Offset + Head->Len) ||
        (Head->Type != Type) || (Head->Len < DescLen)) {
      DEBUG (( EFI_D_ERROR, "UsbCreateDesc: met mal-format descriptor\n"));
      return NULL;
    }
  
    Desc = AllocateZeroPool ((UINTN) CtrlLen);
    if (Desc == NULL) {
      return NULL;
    }
  
    CopyMem (Desc, Head, (UINTN) DescLen);
  
    *Consumed = Offset + Head->Len;
  
    return Desc;
  }
  
  
  /**
    Parse an interface descriptor and its endpoints.
  
    @param  DescBuf               The buffer of raw descriptor.
    @param  Len                   The length of the raw descriptor buffer.
    @param  Consumed              The number of raw descriptor consumed.
  
    @return The create interface setting or NULL if failed.
  
  **/
  USB_INTERFACE_SETTING *
  UsbParseInterfaceDesc (
    IN  UINT8               *DescBuf,
    IN  UINTN               Len,
    OUT UINTN               *Consumed
    )
  {
    USB_INTERFACE_SETTING   *Setting;
    USB_ENDPOINT_DESC       *Ep;
    UINTN                   Index;
    UINTN                   NumEp;
    UINTN                   Used;
    UINTN                   Offset;
  
    *Consumed = 0;
    Setting   = UsbCreateDesc (DescBuf, Len, USB_DESC_TYPE_INTERFACE, &Used);
  
    if (Setting == NULL) {
      DEBUG (( EFI_D_ERROR, "UsbParseInterfaceDesc: failed to create interface descriptor\n"));
      return NULL;
    }
  
    Offset = Used;
  
    //
    // Create an array to hold the interface's endpoints
    //
    NumEp  = Setting->Desc.NumEndpoints;
  
    DEBUG (( EFI_D_INFO, "UsbParseInterfaceDesc: interface %d(setting %d) has %d endpoints\n",
                Setting->Desc.InterfaceNumber, Setting->Desc.AlternateSetting, (UINT32)NumEp));
  
    if (NumEp == 0) {
      goto ON_EXIT;
    }
  
    Setting->Endpoints  = AllocateZeroPool (sizeof (USB_ENDPOINT_DESC *) * NumEp);
  
    if (Setting->Endpoints == NULL) {
      goto ON_ERROR;
    }
  
    //
    // Create the endpoints for this interface
    //
    for (Index = 0; (Index < NumEp) && (Offset < Len); Index++) {
      Ep = UsbCreateDesc (DescBuf + Offset, Len - Offset, USB_DESC_TYPE_ENDPOINT, &Used);
  
      if (Ep == NULL) {
        DEBUG (( EFI_D_ERROR, "UsbParseInterfaceDesc: failed to create endpoint(index %d)\n", (UINT32)Index));
        goto ON_ERROR;
      }
  
      Setting->Endpoints[Index]  = Ep;
      Offset                    += Used;
    }
  
  
  ON_EXIT:
    *Consumed = Offset;
    return Setting;
  
  ON_ERROR:
    UsbFreeInterfaceDesc (Setting);
    return NULL;
  }
  
  
  /**
    Parse the configuration descriptor and its interfaces.
  
    @param  DescBuf               The buffer of raw descriptor.
    @param  Len                   The length of the raw descriptor buffer.
  
    @return The created configuration descriptor.
  
  **/
  USB_CONFIG_DESC *
  UsbParseConfigDesc (
    IN UINT8                *DescBuf,
    IN UINTN                Len
    )
  {
    USB_CONFIG_DESC         *Config;
    USB_INTERFACE_SETTING   *Setting;
    USB_INTERFACE_DESC      *Interface;
    UINTN                   Index;
    UINTN                   NumIf;
    UINTN                   Consumed;
  
    ASSERT (DescBuf != NULL);
  
    Config = UsbCreateDesc (DescBuf, Len, USB_DESC_TYPE_CONFIG, &Consumed);
  
    if (Config == NULL) {
      return NULL;
    }
  
    //
    // Initialize an array of setting for the configuration's interfaces.
    //
    NumIf               = Config->Desc.NumInterfaces;
    Config->Interfaces  = AllocateZeroPool (sizeof (USB_INTERFACE_DESC *) * NumIf);
  
    if (Config->Interfaces == NULL) {
      goto ON_ERROR;
    }
  
    DEBUG (( EFI_D_INFO, "UsbParseConfigDesc: config %d has %d interfaces\n",
                  Config->Desc.ConfigurationValue, (UINT32)NumIf));
  
    for (Index = 0; Index < NumIf; Index++) {
      Interface = AllocateZeroPool (sizeof (USB_INTERFACE_DESC));
  
      if (Interface == NULL) {
        goto ON_ERROR;
      }
  
      Config->Interfaces[Index] = Interface;
    }
  
    //
    // If a configuration has several interfaces, these interfaces are
    // numbered from zero to n. If a interface has several settings,
    // these settings are also number from zero to m. The interface
    // setting must be organized as |interface 0, setting 0|interface 0
    // setting 1|interface 1, setting 0|interface 2, setting 0|. Check
    // USB2.0 spec, page 267.
    //
    DescBuf += Consumed;
    Len     -= Consumed;
  
    //
    // Make allowances for devices that return extra data at the
    // end of their config descriptors
    //
    while (Len >= sizeof (EFI_USB_INTERFACE_DESCRIPTOR)) {
      Setting = UsbParseInterfaceDesc (DescBuf, Len, &Consumed);
  
      if (Setting == NULL) {
        DEBUG (( EFI_D_ERROR, "UsbParseConfigDesc: warning: failed to get interface setting, stop parsing now.\n"));
        break;
  
      } else if (Setting->Desc.InterfaceNumber >= NumIf) {
        DEBUG (( EFI_D_ERROR, "UsbParseConfigDesc: mal-formated interface descriptor\n"));
  
        UsbFreeInterfaceDesc (Setting);
        goto ON_ERROR;
      }
  
      //
      // Insert the descriptor to the corresponding set.
      //
      Interface = Config->Interfaces[Setting->Desc.InterfaceNumber];
  
      if (Interface->NumOfSetting >= USB_MAX_INTERFACE_SETTING) {
        goto ON_ERROR;
      }
  
      Interface->Settings[Interface->NumOfSetting] = Setting;
      Interface->NumOfSetting++;
  
      DescBuf += Consumed;
      Len     -= Consumed;
    }
  
    return Config;
  
  ON_ERROR:
    UsbFreeConfigDesc (Config);
    return NULL;
  }
  
  
  /**
    USB standard control transfer support routine. This
    function is used by USB device. It is possible that
    the device's interfaces are still waiting to be
    enumerated.
  
    @param  UsbDev                The usb device.
    @param  Direction             The direction of data transfer.
    @param  Type                  Standard / class specific / vendor specific.
    @param  Target                The receiving target.
    @param  Request               Which request.
    @param  Value                 The wValue parameter of the request.
    @param  Index                 The wIndex parameter of the request.
    @param  Buf                   The buffer to receive data into / transmit from.
    @param  Length                The length of the buffer.
  
    @retval EFI_SUCCESS           The control request is executed.
    @retval EFI_DEVICE_ERROR      Failed to execute the control transfer.
  
  **/
  EFI_STATUS
  UsbCtrlRequest (
    IN USB_DEVICE             *UsbDev,
    IN EFI_USB_DATA_DIRECTION Direction,
    IN UINTN                  Type,
    IN UINTN                  Target,
    IN UINTN                  Request,
    IN UINT16                 Value,
    IN UINT16                 Index,
    IN OUT VOID               *Buf,
    IN UINTN                  Length
    )
  {
    EFI_USB_DEVICE_REQUEST  DevReq;
    EFI_STATUS              Status;
    UINT32                  Result;
    UINTN                   Len;
  
    ASSERT ((UsbDev != NULL) && (UsbDev->Bus != NULL));
  
    DevReq.RequestType  = USB_REQUEST_TYPE (Direction, Type, Target);
    DevReq.Request      = (UINT8) Request;
    DevReq.Value        = Value;
    DevReq.Index        = Index;
    DevReq.Length       = (UINT16) Length;
  
    Len                 = Length;
    Status = UsbHcControlTransfer (
               UsbDev->Bus,
               UsbDev->Address,
               UsbDev->Speed,
               UsbDev->MaxPacket0,
               &DevReq,
               Direction,
               Buf,
               &Len,
               USB_GENERAL_DEVICE_REQUEST_TIMEOUT,
               &UsbDev->Translator,
               &Result
               );
  
    return Status;
  }
  
  
  /**
    Get the standard descriptors.
  
    @param  UsbDev                The USB device to read descriptor from.
    @param  DescType              The type of descriptor to read.
    @param  DescIndex             The index of descriptor to read.
    @param  LangId                Language ID, only used to get string, otherwise set
                                  it to 0.
    @param  Buf                   The buffer to hold the descriptor read.
    @param  Length                The length of the buffer.
  
    @retval EFI_SUCCESS           The descriptor is read OK.
    @retval Others                Failed to retrieve the descriptor.
  
  **/
  EFI_STATUS
  UsbCtrlGetDesc (
    IN  USB_DEVICE          *UsbDev,
    IN  UINTN               DescType,
    IN  UINTN               DescIndex,
    IN  UINT16              LangId,
    OUT VOID                *Buf,
    IN  UINTN               Length
    )
  {
    EFI_STATUS              Status;
  
    Status = UsbCtrlRequest (
               UsbDev,
               EfiUsbDataIn,
               USB_REQ_TYPE_STANDARD,
               USB_TARGET_DEVICE,
               USB_REQ_GET_DESCRIPTOR,
               (UINT16) ((DescType << 8) | DescIndex),
               LangId,
               Buf,
               Length
               );
  
    return Status;
  }
  
  
  /**
    Return the max packet size for endpoint zero. This function
    is the first function called to get descriptors during bus
    enumeration.
  
    @param  UsbDev                The usb device.
  
    @retval EFI_SUCCESS           The max packet size of endpoint zero is retrieved.
    @retval EFI_DEVICE_ERROR      Failed to retrieve it.
  
  **/
  EFI_STATUS
  UsbGetMaxPacketSize0 (
    IN USB_DEVICE           *UsbDev
    )
  {
    EFI_USB_DEVICE_DESCRIPTOR DevDesc;
    EFI_STATUS                Status;
    UINTN                     Index;
  
  
    //
    // Get the first 8 bytes of the device descriptor which contains
    // max packet size for endpoint 0, which is at least 8.
    //
    for (Index = 0; Index < 3; Index++) {
      Status = UsbCtrlGetDesc (UsbDev, USB_DESC_TYPE_DEVICE, 0, 0, &DevDesc, 8);
  
      if (!EFI_ERROR (Status)) {
        if ((DevDesc.BcdUSB >= 0x0300) && (DevDesc.MaxPacketSize0 == 9)) {
          UsbDev->MaxPacket0 = 1 << 9;
          return EFI_SUCCESS;
        }
        UsbDev->MaxPacket0 = DevDesc.MaxPacketSize0;
        return EFI_SUCCESS;
      }
  
      gBS->Stall (USB_RETRY_MAX_PACK_SIZE_STALL);
    }
  
    return EFI_DEVICE_ERROR;
  }
  
  
  /**
    Get the device descriptor for the device.
  
    @param  UsbDev                The Usb device to retrieve descriptor from.
  
    @retval EFI_SUCCESS           The device descriptor is returned.
    @retval EFI_OUT_OF_RESOURCES  Failed to allocate memory.
  
  **/
  EFI_STATUS
  UsbGetDevDesc (
    IN USB_DEVICE           *UsbDev
    )
  {
    USB_DEVICE_DESC         *DevDesc;
    EFI_STATUS              Status;
  
    DevDesc = AllocateZeroPool (sizeof (USB_DEVICE_DESC));
  
    if (DevDesc == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
  
    Status  = UsbCtrlGetDesc (
                UsbDev,
                USB_DESC_TYPE_DEVICE,
                0,
                0,
                DevDesc,
                sizeof (EFI_USB_DEVICE_DESCRIPTOR)
                );
  
    if (EFI_ERROR (Status)) {
      gBS->FreePool (DevDesc);
    } else {
      UsbDev->DevDesc = DevDesc;
    }
  
    return Status;
  }
  
  
  /**
    Retrieve the indexed string for the language. It requires two
    steps to get a string, first to get the string's length. Then
    the string itself.
  
    @param  UsbDev                The usb device.
    @param  Index                 The index the string to retrieve.
    @param  LangId                Language ID.
  
    @return The created string descriptor or NULL.
  
  **/
  EFI_USB_STRING_DESCRIPTOR *
  UsbGetOneString (
    IN     USB_DEVICE       *UsbDev,
    IN     UINT8            Index,
    IN     UINT16           LangId
    )
  {
    EFI_USB_STRING_DESCRIPTOR Desc;
    EFI_STATUS                Status;
    UINT8                     *Buf;
  
    //
    // First get two bytes which contains the string length.
    //
    Status = UsbCtrlGetDesc (UsbDev, USB_DESC_TYPE_STRING, Index, LangId, &Desc, 2);
  
    if (EFI_ERROR (Status)) {
      return NULL;
    }
  
    Buf = AllocateZeroPool (Desc.Length);
  
    if (Buf == NULL) {
      return NULL;
    }
  
    Status = UsbCtrlGetDesc (
               UsbDev,
               USB_DESC_TYPE_STRING,
               Index,
               LangId,
               Buf,
               Desc.Length
               );
  
    if (EFI_ERROR (Status)) {
      FreePool (Buf);
      return NULL;
    }
  
    return (EFI_USB_STRING_DESCRIPTOR *) Buf;
  }
  
  
  /**
    Build the language ID table for string descriptors.
  
    @param  UsbDev                The Usb device.
  
    @retval EFI_UNSUPPORTED       This device doesn't support string table.
  
  **/
  EFI_STATUS
  UsbBuildLangTable (
    IN USB_DEVICE           *UsbDev
    )
  {
    EFI_USB_STRING_DESCRIPTOR *Desc;
    EFI_STATUS                Status;
    UINTN                     Index;
    UINTN                     Max;
    UINT16                    *Point;
  
    //
    // The string of language ID zero returns the supported languages
    //
    Desc = UsbGetOneString (UsbDev, 0, 0);
  
    if (Desc == NULL) {
      return EFI_UNSUPPORTED;
    }
  
    if (Desc->Length < 4) {
      Status = EFI_UNSUPPORTED;
      goto ON_EXIT;
    }
  
    Status = EFI_SUCCESS;
  
    Max   = (Desc->Length - 2) / 2;
    Max   = MIN(Max, USB_MAX_LANG_ID);
  
    Point = Desc->String;
    for (Index = 0; Index < Max; Index++) {
      UsbDev->LangId[Index] = *Point;
      Point++;
    }
  
    UsbDev->TotalLangId = (UINT16)Max;
  
  ON_EXIT:
    gBS->FreePool (Desc);
    return Status;
  }
  
  
  /**
    Retrieve the indexed configure for the device. USB device
    returns the configuration together with the interfaces for
    this configuration. Configuration descriptor is also of
    variable length.
  
    @param  UsbDev                The Usb interface.
    @param  Index                 The index of the configuration.
  
    @return The created configuration descriptor.
  
  **/
  EFI_USB_CONFIG_DESCRIPTOR *
  UsbGetOneConfig (
    IN USB_DEVICE           *UsbDev,
    IN UINT8                Index
    )
  {
    EFI_USB_CONFIG_DESCRIPTOR Desc;
    EFI_STATUS                Status;
    VOID                      *Buf;
  
    //
    // First get four bytes which contains the total length
    // for this configuration.
    //
    Status = UsbCtrlGetDesc (UsbDev, USB_DESC_TYPE_CONFIG, Index, 0, &Desc, 8);
  
    if (EFI_ERROR (Status)) {
      DEBUG (( EFI_D_ERROR, "UsbGetOneConfig: failed to get descript length(%d) %r\n",
                  Desc.TotalLength, Status));
  
      return NULL;
    }
  
    DEBUG (( EFI_D_INFO, "UsbGetOneConfig: total length is %d\n", Desc.TotalLength));
  
    Buf = AllocateZeroPool (Desc.TotalLength);
  
    if (Buf == NULL) {
      return NULL;
    }
  
    Status = UsbCtrlGetDesc (UsbDev, USB_DESC_TYPE_CONFIG, Index, 0, Buf, Desc.TotalLength);
  
    if (EFI_ERROR (Status)) {
      DEBUG (( EFI_D_ERROR, "UsbGetOneConfig: failed to get full descript %r\n", Status));
  
      FreePool (Buf);
      return NULL;
    }
  
    return Buf;
  }
  
  
  /**
    Build the whole array of descriptors. This function must
    be called after UsbGetMaxPacketSize0 returns the max packet
    size correctly for endpoint 0.
  
    @param  UsbDev                The Usb device.
  
    @retval EFI_SUCCESS           The descriptor table is build.
    @retval EFI_OUT_OF_RESOURCES  Failed to allocate resource for the descriptor.
  
  **/
  EFI_STATUS
  UsbBuildDescTable (
    IN USB_DEVICE           *UsbDev
    )
  {
    EFI_USB_CONFIG_DESCRIPTOR *Config;
    USB_DEVICE_DESC           *DevDesc;
    USB_CONFIG_DESC           *ConfigDesc;
    UINT8                     NumConfig;
    EFI_STATUS                Status;
    UINT8                     Index;
  
    //
    // Get the device descriptor, then allocate the configure
    // descriptor pointer array to hold configurations.
    //
    Status = UsbGetDevDesc (UsbDev);
  
    if (EFI_ERROR (Status)) {
      DEBUG (( EFI_D_ERROR, "UsbBuildDescTable: failed to get device descriptor - %r\n", Status));
      return Status;
    }
  
    DevDesc   = UsbDev->DevDesc;
    NumConfig = DevDesc->Desc.NumConfigurations;
    if (NumConfig == 0) {
      return EFI_DEVICE_ERROR;
    }
  
    DevDesc->Configs = AllocateZeroPool (NumConfig * sizeof (USB_CONFIG_DESC *));
    if (DevDesc->Configs == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
  
    DEBUG (( EFI_D_INFO, "UsbBuildDescTable: device has %d configures\n", NumConfig));
  
    //
    // Read each configurations, then parse them
    //
    for (Index = 0; Index < NumConfig; Index++) {
      Config = UsbGetOneConfig (UsbDev, Index);
  
      if (Config == NULL) {
        DEBUG (( EFI_D_ERROR, "UsbBuildDescTable: failed to get configure (index %d)\n", Index));
  
        //
        // If we can get the default descriptor, it is likely that the
        // device is still operational.
        //
        if (Index == 0) {
          return EFI_DEVICE_ERROR;
        }
  
        break;
      }
  
      ConfigDesc = UsbParseConfigDesc ((UINT8 *) Config, Config->TotalLength);
  
      FreePool (Config);
  
      if (ConfigDesc == NULL) {
        DEBUG (( EFI_D_ERROR, "UsbBuildDescTable: failed to parse configure (index %d)\n", Index));
  
        //
        // If we can get the default descriptor, it is likely that the
        // device is still operational.
        //
        if (Index == 0) {
          return EFI_DEVICE_ERROR;
        }
  
        break;
      }
  
      DevDesc->Configs[Index] = ConfigDesc;
    }
  
    //
    // Don't return error even this function failed because
    // it is possible for the device to not support strings.
    //
    Status = UsbBuildLangTable (UsbDev);
  
    if (EFI_ERROR (Status)) {
      DEBUG (( EFI_D_INFO, "UsbBuildDescTable: get language ID table %r\n", Status));
    }
  
    return EFI_SUCCESS;
  }
  
  
  /**
    Set the device's address.
  
    @param  UsbDev                The device to set address to.
    @param  Address               The address to set.
  
    @retval EFI_SUCCESS           The device is set to the address.
    @retval Others                Failed to set the device address.
  
  **/
  EFI_STATUS
  UsbSetAddress (
    IN USB_DEVICE           *UsbDev,
    IN UINT8                Address
    )
  {
    EFI_STATUS              Status;
  
    Status = UsbCtrlRequest (
               UsbDev,
               EfiUsbNoData,
               USB_REQ_TYPE_STANDARD,
               USB_TARGET_DEVICE,
               USB_REQ_SET_ADDRESS,
               Address,
               0,
               NULL,
               0
               );
  
    return Status;
  }
  
  
  /**
    Set the device's configuration. This function changes
    the device's internal state. UsbSelectConfig changes
    the Usb bus's internal state.
  
    @param  UsbDev                The USB device to set configure to.
    @param  ConfigIndex           The configure index to set.
  
    @retval EFI_SUCCESS           The device is configured now.
    @retval Others                Failed to set the device configure.
  
  **/
  EFI_STATUS
  UsbSetConfig (
    IN USB_DEVICE           *UsbDev,
    IN UINT8                ConfigIndex
    )
  {
    EFI_STATUS              Status;
  
    Status = UsbCtrlRequest (
               UsbDev,
               EfiUsbNoData,
               USB_REQ_TYPE_STANDARD,
               USB_TARGET_DEVICE,
               USB_REQ_SET_CONFIG,
               ConfigIndex,
               0,
               NULL,
               0
              );
  
    return Status;
  }
  
  
  /**
    Usb UsbIo interface to clear the feature. This is should
    only be used by HUB which is considered a device driver
    on top of the UsbIo interface.
  
    @param  UsbIo                 The UsbIo interface.
    @param  Target                The target of the transfer: endpoint/device.
    @param  Feature               The feature to clear.
    @param  Index                 The wIndex parameter.
  
    @retval EFI_SUCCESS           The device feature is cleared.
    @retval Others                Failed to clear the feature.
  
  **/
  EFI_STATUS
  UsbIoClearFeature (
    IN  EFI_USB_IO_PROTOCOL *UsbIo,
    IN  UINTN               Target,
    IN  UINT16              Feature,
    IN  UINT16              Index
    )
  {
    EFI_USB_DEVICE_REQUEST  DevReq;
    UINT32                  UsbResult;
    EFI_STATUS              Status;
  
    DevReq.RequestType  = USB_REQUEST_TYPE (EfiUsbNoData, USB_REQ_TYPE_STANDARD, Target);
    DevReq.Request      = USB_REQ_CLEAR_FEATURE;
    DevReq.Value        = Feature;
    DevReq.Index        = Index;
    DevReq.Length       = 0;
  
    Status = UsbIo->UsbControlTransfer (
                      UsbIo,
                      &DevReq,
                      EfiUsbNoData,
                      USB_CLEAR_FEATURE_REQUEST_TIMEOUT,
                      NULL,
                      0,
                      &UsbResult
                      );
  
    return Status;
  }
  