Note
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The USB class driver sends this request to activate the bus so that the driver can prepare to process bus events and handle traffic.
Major code
IRP_MJ_INTERNAL_DEVICE_CONTROL
Input buffer
NULL.
Input buffer length
None.
Output buffer
NULL.
Output buffer length
None.
Status block
If the request is successful, the USB function class extension (UFX) returns STATUS_SUCCESS, or another status value for which NT_SUCCESS(status) equals TRUE. Otherwise it returns a status value for which NT_SUCCESS(status) equals FALSE.
Remarks
All class drivers must send this IOCTL request before the device attempts to connect with the host.
Requirements
| Requirement | Value |
|---|---|
| Header | usbfnioctl.h (include Usbfnioctl.h) |