Intel Extensible Firmware Interface - Manual (Page 293)

Protocols — EFI Driver Model
Version 1.10 12/01/02 9-51
Description
This function retrieves the user readable name of the controller specified by
ControllerHandle and ChildHandle in the form of a Unicode string. If the driver
specified by This has a user readable name in the language specified by Language , then a
pointer to the controller name is returned in ControllerName , and EFI_SUCCESS is returned.
If the driver specified by This is not currently managing the controller specified by
ControllerHandle and ChildHandle , then EFI_UNSUPPORTED is returned.
If the driver specified by This does not support the language specified by Language , then
EFI_UNSUPPORTED is returned.
Status Codes Returned
EFI_SUCCESS The Unicode string for the user readable name specified by This ,
ControllerHandle , ChildHandle , and Language was returned in
ControllerName .
EFI_INVALID_PARAMETER ControllerHandle is not a valid EFI_HANDLE .
EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid EFI_HANDLE .
EFI_INVALID_PARAMETER Language is NULL .
EFI_INVALID_PARAMETER ControllerName is NULL .
EFI_UNSUPPORTED The driver specified by This is not currently managing the controller
specified by ControllerHandle and ChildHandle .
EFI_UNSUPPORTED The driver specified by This does not support the language specified by
Language .