// usbfnioctl.h

// CTL_CODE(0x002a, 0x00d, METHOD_OUT_DIRECT, FILE_READ_ACCESS | FILE_WRITE_ACCESS)
#define IOCTL_INTERNAL_USBFN_BUS_EVENT_NOTIFICATION 0x002AC036
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Windows Driver Kit DDI reference (ni-usbfnioctl-ioctl_internal_usbfn_bus_event_notification)

IOCTL_INTERNAL_USBFN_BUS_EVENT_NOTIFICATION IOCTL

Description

The USB class driver sends this request to prepare for notifications received from the USB function class extension (UFX) in response to an event on the bus, such as a change in the port type or a receipt of a non-standard setup packet.

Parameters

Major code

IRP_MJ_INTERNAL_DEVICE_CONTROL

Input buffer

NULL.

Input buffer length

None.

Output buffer

A pointer to a caller-allocated USBFN_NOTIFICATION structure that UFX populates with the type of bus event and data associated with that event.

Output buffer length

The size of a USBFN_NOTIFICATION structure.

Input/output buffer

Input/output buffer length

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

UFX completes this request in response to an event on the bus. It is recommended that class drivers send multiple requests at a time to make sure that critical notifications are not missed.

IOCTL_INTERNAL_USBFN_BUS_EVENT_NOTIFICATION - NtDoc