=> R0 = pointer to host controller structure
R1 = version number the controller structure corresponds to
<= R0 = HC bus handle
This SWI registers a new host controller with USBDriver. If USBDriver knows that the RISCOS_USBDRIVER_API_VERSION given in R1 incompatible with its current expectations, then the registration will be rejected.
Host controller bus structure
+0 usbd_bus structure
+n Other private data for the host controller
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