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Protocols — USB Support
Version 1.10 12/01/02 14-25
EFI_USB_HC_PROTOCOL.GetRootHubPortNumber()
Summary
Retrieves the number of root hub ports.
Prototype
typedef
EFI_STATUS
(EFIAPI *EFI_USB_HC_PROTOCOL_GET_ROOTHUB_PORT_NUMBER) (
IN EFI_USB_HC_PROTOCOL *This,
OUT UINT8 *PortNumber
);
Parameters
This A pointer to the EFI_USB_HC_PROTOCOL instance. Type
EFI_USB_HC_PROTOCOL is defined in Section 14.1.
PortNumber A pointer to the number of the root hub ports.
Description
This function is used to retrieve the number of root hub ports. The number of root hub ports is
required by the USB bus driver to perform bus enumeration.
Status Codes Returned
EFI_SUCCESS The port number was retrieved successfully.
EFI_INVALID_PARAMETER
PortNumber is NULL.
EFI_DEVICE_ERROR An error was encountered while attempting to retrieve the port number.