Dmitry, what I'm saying is, you're looking at from the perspective of the device. The computer is likely looking at it from the perspective of the port.
For the port, it is a USB to ADB adapter.
For the device, it is an ADB to USB adapter.
See how it works now? It really depends on which side it is "integral" to. If it's part of the device, it's one direction. If it's part of the computer, it's the other.