Service_USB 32 - HUB state changed

Service_USB 32 - HUB state changed
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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.

On Entry

32 (reason code)

&80C00 (USB Service call)

Pointer to controller structure

Pointer to device structure (to Hub device)

Pointer to device structure (to device attached to port) or zero if not known

Port number or zero if not port but Hub related

Value	Definition	Description
0	SERVICE_USB_HUB_ATTACHED	Device has been attached to a port
1	SERVICE_USB_HUB_REMOVED	Device has been removed from a port
2	SERVICE_USB_HUB_DISABLED	Device has been disabled at a port
3	SERVICE_USB_HUB_RESET	Device has been reset at a port
4	SERVICE_USB_HUB_OC_OCCURED	Overcurrent Situation at Port/Hub occurred
5	SERVICE_USB_HUB_OC_CLEARED	Overcurrent Situation at Port/Hub cleared

On Exit

R0	preserved
R1	preserved to pass on (do not claim)
R2, R3, R4, R5, R6	preserved

Use

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.

Warning

This Service call has been superseded and is no longer issued. The USB message system should now be used in preference.

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