[wdmaudiodev] Re: StartDevice Empty Resource List?
- From: Tim Roberts <timr@xxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 5 Jun 2013 10:23:55 -0700
Revan Foly wrote:
>
> I chose those three interfaces after reading this MSDN article, which
> states that raw MIDI processing devices should not ue
> KSCATEGORY_SYNTHESIZER:
> http://msdn.microsoft.com/en-us/library/windows/hardware/ff536813%28v=vs.85%29.aspx
> <http://msdn.microsoft.com/en-us/library/windows/hardware/ff536813%2528v=vs.85%2529.aspx>
OK, you talked me into it.
> Eugene's mail was a great push in the right direction, I'm looking
> more into driver installation now, which seems to be a whole world for
> itself. Eugenes code was a good starting point but needs alot of
> adapting. I'm still a little confused about all the different concepts
> (e.g. whenever i stumble across PNP-Manager references in MSDN I think
> 'uh well but there is no hardware'!,
The key point is to think about how you get loaded. With a non-PnP
driver, you have to be loaded explicitly by someone, using the Service
Manager (such as "net start"). With a PnP driver, you get loaded
automatically when your INF file matches the hardware ID on a newly
created PDO. Some bus driver somewhere has to create that PDO. With
virtual devices, that's often done with "devcon install". PnP can't
tell the difference between a new PCI device and a new virtual device.
So, the "hardware" part really is irrelevant.
Once you are a PnP device, you play all the same games that a real
hardware driver plays. Your bus driver isn't going to hand you any
memory or interrupt resources, but you get all the other requests (like
power management).
> or should i use SetupAPI or the Driver Installer Framework). It's hard
> to fit all together.
For a PnP device, you have to get your driver copied onto the system's
hard disk ("pre-install"), and someone has to create the PDO to trigger
your loading. I use DPInst to do my pre-installs, but you'll need some
other tool to trigger the creation of a PDO. The Setup APIs can do that
(see the source for "devcon install" for an example).
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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