Description, Status code returned – Intel Extensible Firmware Interface User Manual
Page 595
Protocols
— USB Support
Version 1.10
12/01/02
14-55
Description
This function is used to retrieve information about USB devices. This information includes the
device class, subclass, and the number of configurations the USB device supports. If
DeviceDescriptor
is
NULL
, then
EFI_INVALID_PARAMETER
is returned. If the USB
device descriptor is not found, then
EFI_NOT_FOUND
is returned. Otherwise, the device
descriptor is returned in
DeviceDescriptor
, and
EFI_SUCCESS
is returned.
Status Code Returned
EFI_SUCCESS
The device descriptor was retrieved successfully.
EFI_INVALID_PARAMETER
DeviceDescriptor
is NULL.
EFI_NOT_FOUND
The device descriptor was not found. The device may not be configured.
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