IEEE 1394 Unit Filter Driver Registration (Windows CE 5.0)
A virtual subunit driver performs two key initialization tasks at startup, preferably at IRP_MN_START_DEVICE time. The virtual subunit driver first registers with the unit filter driver. You can use the IOCTL_UNIT_REGISTER_SUBUNIT command to register with the unit filter driver.
The mandatory callback functions are the functions that the virtual subunit must export to the unit filter driver. The filter driver can call these functions at any time, typically in response to a received AV/C unit command. These callbacks are for requesting that the subunit allocate or free a local serial bus plug, for associating a local serial bus plug with a particular subunit plug, and for requesting that the subunit actively attempt to initiate a connection to a given plug on a remote device.
For more information about these callbacks and their purposes, see IEEE 1394 Unit Filter Driver Plug Management.
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