Intel Extensible Firmware Interface - Manual (Page 597)

Protocols — USB Support
Version 1.10 12/01/02 14-57
EFI_USB_IO_PROTOCOL.UsbGetInterfaceDescriptor()
Summary
Retrieves the Interface Descriptor for a USB Device Controller. As stated earlier, an interface
within a USB device is equivalently to a USB Controller within the current configuration.
Prototype
typedef
EFI_STATUS
(EFIAPI *EFI_USB_IO_GET_INTERFACE_DESCRIPTOR) (
IN EFI_USB_IO_PROTOCOL
*This,
OUT EFI_USB_INTERFACE_DESCRIPTOR *InterfaceDescriptor
);
Parameters
This A pointer to the EFI_USB_IO_PROTOCOL instance. Type
EFI_USB_IO_PROTOCOL is defined in Section 14.2.5.
InterfaceDescriptor A pointer to the caller allocated USB Interface Descriptor within
the configuration setting. See “Related Definitions” for a
detailed description.
Related Definitions
//
// See USB1.1 for detail descrption.
//
typedef struct {
UINT8
Length;
UINT8 DescriptorType;
UINT8 InterfaceNumber;
UINT8 AlternateSetting;
UINT8 NumEndpoints;
UINT8 InterfaceClass;
UINT8 InterfaceSubClass;
UINT8 InterfaceProtocol;
UINT8 Interface;
} EFI_USB_INTERFACE_DESCRIPTOR;