// ucxroothub.h

typedef struct _ROOTHUB_INFO {
  ULONG           Size;
  CONTROLLER_TYPE ControllerType;
  USHORT          NumberOf20Ports;
  USHORT          NumberOf30Ports;
  USHORT          MaxU1ExitLatency;
  USHORT          MaxU2ExitLatency;
} ROOTHUB_INFO, *PROOTHUB_INFO;
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Windows Driver Kit DDI reference (ns-ucxroothub-_roothub_info)

_ROOTHUB_INFO structure

Description

Provides information about a USB root hub. This structure is passed by UCX in the EVT_UCX_ROOTHUB_GET_INFO callback function.

Members

`Size`

The size in bytes of this structure.

`ControllerType`

A CONTROLLER_TYPE value that identifies the type of eXtensible Host Controller Interface (xHCI) which has the root hub.

`NumberOf20Ports`

The number of USB 2.0 ports connected to the root hub.

`NumberOf30Ports`

The number of USB 3.0 ports connected to the root hub.

`MaxU1ExitLatency`

The exit latency for the slowest link for U1 transition.

`MaxU2ExitLatency`

The exit latency for the slowest link for U2 transition.

ROOTHUB_INFO - NtDoc