Service_USB 32 - HUB state changed — Broadcast by the Hub Class driver module to inform other programs about changes inside a hub or about changes about device states detected by the Hub.
R0 | 32 (reason code) | |||||||||||||||||||||
R1 | &80C00 (USB Service call) | |||||||||||||||||||||
R2 | Pointer to controller structure | |||||||||||||||||||||
R3 | Pointer to device structure (to Hub device) | |||||||||||||||||||||
R4 | Pointer to device structure (to device attached to port) or zero if not known | |||||||||||||||||||||
R5 | Port number or zero if not port but Hub related | |||||||||||||||||||||
R6 |
|
R0 | preserved |
R1 | preserved to pass on (do not claim) |
R2, R3, R4, R5, R6 | preserved |
The events reported are based entirely on state changes detected by the devices. The Service Call is for information purposes only. You must not claim it.
This Service call has been superseded and is no longer issued. The USB message system should now be used in preference.