[haiku-development] Re: device_manager: driver in use to userspace
- From: "François Revol" <revol@xxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 06 Oct 2009 11:38:44 +0200 CEST
> Hello,
>
> I'm making good progress on the Devices application, I'm creating a
> patch to include it in the Haiku tree (pending your thorough
> inspection
> and feedback, of course. ;-) )
>
> I would like to display the used driver for a device (if possible
> including the full path of the driver binary). Is it possible to add
> the
> used driver (if any) as an attribute? I see a device_node has a
> driver_module_info (fDriver) which again has an module_info (info),
> which has a name.
>
> Would this work only for new style drivers, or for all?
Yes, old-style driver have weak relations with the hardware they use,
they just iterate over the PCI or whichever bus, and use the device
directly without reserving it.
I added an API to do it for audio drivers but it's not yet much used.
On /dev nodes one can use an ioctl() to ask for the driver name, but
you must open() the device first which can be problematic.
François.
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