When is function driver of a statically enumerated device loaded?
When is function driver of a statically enumerated device loaded?
The discussion below applies only to KMDF drivers for Windows Phone8.1
I'm studying a sample driver package with a software-only bus driver(sample_bus.sys, whose start type is SERVICE_SYSTEM_START (0x01)) and one statically enumerated child driver(sample_child.sys, whose start type is SERVICE_DEMAND_START (0x3)).
In the bus driver, a PDO for the child device is created. But I cannot figure out when the function driver(sample_child.sys) for the child device is loaded(I guess the funcion driver for the child device is loaded by PNP)
So the question is: which function(s) below "trigger" the loading of function driver of child device(sample_child.sys)?
Follwing is sample code of the bus driver(sample_bus.sys); error checking code is removed for simplicity
deviceInit = WdfPdoInitAllocate( device );status = WdfPdoInitAssignDeviceID( deviceInit, &str); //Device IDstatus = WdfPdoInitAddHardwareID( deviceInit, &str ); //Hardware IDWDF_OBJECT_ATTRIBUTES_INIT_CONTEXT_TYPE( &pdoAttributes, SAMPLE_DRIVER_DATA );pdoAttributes.EvtCleanupCallback = SampleDriverFdoCleanupChildDevice;pdoAttributes.SynchronizationScope = WdfSynchronizationScopeDevice;status = WdfDeviceInitRegisterPnpStateChangeCallback( deviceInit, WdfDevStatePnpStarted, SampleBusFdoChildStarted, StateNotificationEnterState );status = WdfDeviceCreate( &deviceInit, &pdoAttributes, &childDevice );status = WdfFdoAddStaticChild( device, childDevice );
If you think about this the driver for the PDO is loaded in response to the system learning that there is a new PDO in the stack. Given that it is WdfFdoAddStaticChild that will trigger the load.
Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com
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