// ucxroothub.h

typedef struct _HUB_INFO_FROM_PARENT {
  PDEVICE_OBJECT                              IoTarget;
  USB_DEVICE_DESCRIPTOR                       DeviceDescriptor;
  USHORT                                      U1ExitLatency;
  USHORT                                      U2ExitLatency;
  USHORT                                      ExitLatencyOfSlowestLinkForU1;
  UCHAR                                       DepthOfSlowestLinkForU1;
  USHORT                                      ExitLatencyOfSlowestLinkForU2;
  UCHAR                                       DepthOfSlowestLinkForU2;
  USHORT                                      HostInitiatedU1ExitLatency;
  USHORT                                      HostInitiatedU2ExitLatency;
  UCHAR                                       TotalHubDepth;
  USHORT                                      TotalTPPropogationDelay;
  PARENT_HUB_FLAGS                            HubFlags;
  PUSB_DEVICE_CAPABILITY_SUPERSPEEDPLUS_SPEED SublinkSpeedAttr;
  ULONG                                       SublinkSpeedAttrCount;
} HUB_INFO_FROM_PARENT, *PHUB_INFO_FROM_PARENT;
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Windows Driver Kit DDI reference (ns-ucxroothub-_hub_info_from_parent)

_HUB_INFO_FROM_PARENT structure

Description

Describes information about a hub from its parent device.

Members

`IoTarget`

A pointer to the WDM device object of the parent that represents the I/O target.

`DeviceDescriptor`

A USB_DEVICE_DESCRIPTOR structure that contains the device descriptor.

`U1ExitLatency`

The time to transition from the U1 state.

`U2ExitLatency`

The time to transition from the U2 state.

`ExitLatencyOfSlowestLinkForU1`

The exit latency for the slowest link for U1 transition.

`DepthOfSlowestLinkForU1`

The depth of the hub based on which the latency for the slowest link is calculated for a U1 transition.

`ExitLatencyOfSlowestLinkForU2`

The exit latency for the slowest link for U2 transition.

`DepthOfSlowestLinkForU2`

The depth of the hub based on which the latency for the slowest link is calculated for a U2 transition.

`HostInitiatedU1ExitLatency`

Host-initiated exit latency to transition from the U1 state.

`HostInitiatedU2ExitLatency`

Host-initiated exit latency to transition from the U2 state.

`TotalHubDepth`

Total hub depth.

`TotalTPPropogationDelay`

The total TP propagation delay.

`HubFlags`

A bitwise-OR of PARENT_HUB_FLAGS flags.

`SublinkSpeedAttr`

A pointer to a USB_DEVICE_CAPABILITY_SUPERSPEEDPLUS_SPEED structure that describes the USB 3.1 capability's sublink speed attributes. For structure declaration, see Usbspec.h

`SublinkSpeedAttrCount`

The count of sublink speed attributes.

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