C++ (Cpp) UsbHubCtrlGetHubDesc示例

示例#1

文件： UsbHub.c 项目： hsienchieh/uefilab

/**
  Read the whole usb hub descriptor. It is necessary
  to do it in two steps because hub descriptor is of
  variable length.

  @param  HubDev                The hub device.
  @param  HubDesc               The variable to return the descriptor.

  @retval EFI_SUCCESS           The hub descriptor is read.
  @retval Others                Failed to read the hub descriptor.

**/
EFI_STATUS
UsbHubReadDesc (
  IN  USB_DEVICE              *HubDev,
  OUT EFI_USB_HUB_DESCRIPTOR  *HubDesc
  )
{
  EFI_STATUS              Status;

  if (HubDev->Speed == EFI_USB_SPEED_SUPER) {
    //
    // Get the super speed hub descriptor
    //
    Status = UsbHubCtrlGetSuperSpeedHubDesc (HubDev, HubDesc);
  } else {

    //
    // First get the hub descriptor length
    //
    Status = UsbHubCtrlGetHubDesc (HubDev, HubDesc, 2);

    if (EFI_ERROR (Status)) {
      return Status;
    }

    //
    // Get the whole hub descriptor
    //
    Status = UsbHubCtrlGetHubDesc (HubDev, HubDesc, HubDesc->Length);
  }

  return Status;
}

示例#2

文件： UsbHub.c 项目： mdaniel/virtualbox-org-svn-vbox-trunk

/**
  Read the whole usb hub descriptor. It is necessary
  to do it in two steps because hub descriptor is of
  variable length.

  @param  HubDev                The hub device.
  @param  HubDesc               The variable to return the descriptor.

  @retval EFI_SUCCESS           The hub descriptor is read.
  @retval Others                Failed to read the hub descriptor.

**/
EFI_STATUS
UsbHubReadDesc (
  IN  USB_DEVICE              *HubDev,
  OUT EFI_USB_HUB_DESCRIPTOR  *HubDesc
  )
{
  EFI_STATUS              Status;

  //
  // First get the hub descriptor length
  //
  Status = UsbHubCtrlGetHubDesc (HubDev, HubDesc, 2);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Get the whole hub descriptor
  //
  return UsbHubCtrlGetHubDesc (HubDev, HubDesc, HubDesc->Length);
}