Getting a WDFUSBDEVICE in a KMDF Filter

NTDEV
1

I would like to get a WDFUSBDEVICE to get some information from my USB devices with my Lower Filter.

I’m was thinking of using WdfUsbTargetDeviceCreate() in the EvtDriverDeviceAdd(), but the documentation states : " (The driver cannot call WdfUsbTargetDeviceCreate from within its EvtDriverDeviceAdd callback function.)"…

Documentation also states : “Typically, a driver calls WdfUsbTargetDeviceCreate from within its EvtDevicePrepareHardware callback function.” I suspect this does not apply to a KMDF Filter …

What to do?

2

The docs are correct. What do you want to use the wdfusbdevice for?

d

dent from a phpne with no keynoard

-----Original Message-----
From: xxxxx@live.ca
Sent: October 03, 2010 1:28 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] Getting a WDFUSBDEVICE in a KMDF Filter

I would like to get a WDFUSBDEVICE to get some information from my USB devices with my Lower Filter.

I’m was thinking of using WdfUsbTargetDeviceCreate() in the EvtDriverDeviceAdd(), but the documentation states : " (The driver cannot call WdfUsbTargetDeviceCreate from within its EvtDriverDeviceAdd callback function.)"…

Documentation also states : “Typically, a driver calls WdfUsbTargetDeviceCreate from within its EvtDevicePrepareHardware callback function.” I suspect this does not apply to a KMDF Filter …

What to do?

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3

Okay, thank you for the confirmation.

The goal is to get the USB Descriptor.

Yes, I think there is a way to do it with URB_FUNCTION_GET_DESCRIPTOR_FROM_X…

But, it seems more cumbersome than using WDFUSBDEVICE and the WdfUSbXXXX series of methods. May be only because I find more documentation on it.