USB WDM driver Reading Configuration Descriptor before DriverEntry

NTDEV
1

Dear All ,

I have a USB device (with bulk endpoint) for Which i am using wdm bulkusb driver.
In DriverEntry function , I want to check the device descriptor & configuration descriptor before Initialize the driver object with driver’s entry points.
I need to check the device descriptor & configuration descriptor before AddDevice is being called .

Please tell me is in the DriverEntry can i do this .
Please let me know the way if possible.

Thanks
Amit Shahi

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2

Can’t do that. The first time you can get the config descriptor is when processing the start irp/EvtDevicePrepareHardware. If you want to set the disptach table based on the device, store a 2ndary dispatch table in you device extension and change the table based on the device typ. This lets you support multiple types in the driver as well.

d

Sent from my phone with no t9, all spilling mistakes are not intentional.

-----Original Message-----
From: Amit Shahi
Sent: Wednesday, January 21, 2009 8:59 PM
To: Windows System Software Devs Interest List
Subject: [ntdev] USB WDM driver Reading Configuration Descriptor before DriverEntry

Dear All ,

I have a USB device (with bulk endpoint) for Which i am using wdm bulkusb driver.
In DriverEntry function , I want to check the device descriptor & configuration descriptor before Initialize the driver object with driver’s entry points.
I need to check the device descriptor & configuration descriptor before AddDevice is being called .

Please tell me is in the DriverEntry can i do this .
Please let me know the way if possible.

Thanks
Amit Shahi

–
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