/**
Read the whole usb hub descriptor. It is necessary
to do it in two steps because hub descriptor is of
variable length.
@param HubDev The hub device.
@param HubDesc The variable to return the descriptor.
@retval EFI_SUCCESS The hub descriptor is read.
@retval Others Failed to read the hub descriptor.
**/
EFI_STATUS
UsbHubReadDesc (
IN USB_DEVICE *HubDev,
OUT EFI_USB_HUB_DESCRIPTOR *HubDesc
)
{
EFI_STATUS Status;
if (HubDev->Speed == EFI_USB_SPEED_SUPER) {
//
// Get the super speed hub descriptor
//
Status = UsbHubCtrlGetSuperSpeedHubDesc (HubDev, HubDesc);
} else {
//
// First get the hub descriptor length
//
Status = UsbHubCtrlGetHubDesc (HubDev, HubDesc, 2);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Get the whole hub descriptor
//
Status = UsbHubCtrlGetHubDesc (HubDev, HubDesc, HubDesc->Length);
}
return Status;
}
/**
Read the whole usb hub descriptor. It is necessary
to do it in two steps because hub descriptor is of
variable length.
@param HubDev The hub device.
@param HubDesc The variable to return the descriptor.
@retval EFI_SUCCESS The hub descriptor is read.
@retval Others Failed to read the hub descriptor.
**/
EFI_STATUS
UsbHubReadDesc (
IN USB_DEVICE *HubDev,
OUT EFI_USB_HUB_DESCRIPTOR *HubDesc
)
{
EFI_STATUS Status;
//
// First get the hub descriptor length
//
Status = UsbHubCtrlGetHubDesc (HubDev, HubDesc, 2);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Get the whole hub descriptor
//
return UsbHubCtrlGetHubDesc (HubDev, HubDesc, HubDesc->Length);
}