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What is the best driver model for implementing support for custom hot-plug controller?

I have a fairly new hot-plug controller that I bought some time ago because it was cheap. it was just sitting around.
It is custom programming interface and needs a driver for Windows to use it.

Somebody designed this using a FPGA and gave it to me. It powers up.

Anyways, I decided to write a driver for it just for the fun of it so I can use it with windows 10.
It has M.2 and old OHCI controller (Is this USB 1.1?).
This is a very wierd combination
Upstream is old PCI so I need a system with a PCie to PCI bridge, I realize

Anyways, I am thinking I will need to write a bus driver that enumerates the PDO for the downstream devices as they are detected and plugged and presents them to Windows.
I would like to start off with KMDF model.

Is a bus driver good enough?. Or do I need to do anything else?.



  • Peter_Viscarola_(OSR)Peter_Viscarola_(OSR) Administrator Posts: 8,165

    Have you plugged it in?

    Why do you think you need to write a bus driver for this device?

    What does the PCI Config Descriptor on the device say?


    Peter Viscarola

  • The classcode has value of 0xff for programming interface which means Windows will not load a driver for it. Under what conditions would Windows load a driver for it?. I did not think Windows came with a standard driver for hot-plug controllers. I am thinking a bus driver is needed because a bunch of devices can be connected downstream and they can come and go. I am not sure how I can avoid writing a driver for it.

  • Tim_RobertsTim_Roberts Member - All Emails Posts: 13,696

    To be pedantic, there's no such thing as a generic "hot-plug controller". Is this a PCI hot-plug controller, so it has PCI on one end and PCI on the other end? For that, you'd write an INF that maps your vendor and device ID to a PCI bridge. If not, what kinds of devices will be coming and going?

    Yes, OHCI is one of the two USB 1.x host controller standards. I assume it has its own vendor and device ID, in which case you can write an INF to map that to a USB host controller.

    Tim Roberts, [email protected]
    Providenza & Boekelheide, Inc.

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