[wdmaudiodev] Re: audio driver questions
- From: Tim Newsham <tim.newsham@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Fri, 11 Sep 2009 08:55:56 -1000
I'm having some problems figuring out how to load such a bus driver. What
would be the class of the bus driver in the INF file?
On Wed, Aug 26, 2009 at 12:10 PM, Tim Roberts <timr@xxxxxxxxx> wrote:
> Tim Newsham wrote:
> >
> > - Is it possible to unregister a miniport driver? Ie. it would be
> > nifty if I could create a miniport driver on demand from another
> > device and then when that other device closed, unregister the
> > miniport. I noticed that miniport-based drivers like msvad can be
> > loaded and unloaded from a live system just fine. I just havent
> > noticed any way to do this from within a driver.
>
> Installation and uninstallation of drivers is a user-mode activity.
>
> However, one way to do what you ask is to make your "other device" into
> a bus driver. When it is ready to have audio services available, you
> call IoInvalidateDeviceRelations, which tells PnP to ask your driver
> about its child devices. You report the PnP ID for your audio device.
> The system will load your audio device, and it will start to run.
>
> When you're ready to kill the device, you call
> IoInvalidateDeviceRelations again, and return nothing. Your audio
> device will be shut down.
>
> This is exactly what the USB bus driver does when a device plugs and
> unplugs. And, really, it's not that hard to do.
>
> --
> Tim Roberts, timr@xxxxxxxxx
> Providenza & Boekelheide, Inc.
>
> ******************
>
> WDMAUDIODEV addresses:
> Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
> Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
> Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
> Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
>
> URL to WDMAUDIODEV page:
> http://www.wdmaudiodev.com/
>
>
Other related posts:
