Intel Extensible Firmware Interface - Manual (Page 594)

Extensible Firmware Interface Specification
14-54 12/01/02 Version 1.10
EFI_USB_IO_PROTOCOL.UsbGetDeviceDescriptor()
Summary
Retrieves the USB Device Descriptor.
Prototype
typedef
EFI_STATUS
(EFIAPI *EFI_USB_IO_GET_DEVICE_DESCRIPTOR) (
IN EFI_USB_IO_PROTOCOL
*This,
OUT EFI_USB_DEVICE_DESCRIPTOR *DeviceDescriptor
);
Parameters
This A pointer to the EFI_USB_IO_PROTOCOL instance. Type
EFI_USB_IO_PROTOCOL is defined in Section 14.2.5.
DeviceDescriptor A pointer to the caller allocated USB Device Descriptor. See
“Related Definitions” for a detailed description.
Related Definitions
//
// See USB1.1 for detail descrption.
//
typedef struct {
UINT8
Length;
UINT8 DescriptorType;
UINT16 BcdUSB;
UINT8 DeviceClass;
UINT8 DeviceSubClass;
UINT8 DeviceProtocol;
UINT8 MaxPacketSize0;
UINT16 IdVendor;
UINT16 IdProduct;
UINT16 BcdDevice;
UINT8 StrManufacturer;
UINT8 StrProduct;
UINT8 StrSerialNumber;
UINT8 NumConfigurations;
} EFI_USB_DEVICE_DESCRIPTOR;