Basic USB related Query.

NTDEV
1

Hi All,

I am asking about complete basics as to what kind of Major URB transactions
will begin on a composite device considering usbccgp.sys driver as a generic
device and no vendor drivers are involved. I am looking for something till
the child drivers are loaded and functional.

Ex - A USB headset or a USB Webcamera with multiple interfaces.

I know this is not the place but it would really help if someone can explain
or point me to some links.

Thanks in advance.

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2

Vishwanath Maram wrote:

I am asking about complete basics as to what kind of Major URB
transactions will begin on a composite device considering
usbccgp.sys driver as a generic device and no vendor drivers
are involved. I am looking for something till the child drivers are
loaded and functional.

Why don’t you create a lower filter to usbccgp and inspect them all yourself?

3

You could install a lower filter below the composite driver and log the URBs. Basically, the composite driver will query for a bunch of descriptors, esp the config descriptor.

d

From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of Vishwanath Maram
Sent: Tuesday, October 30, 2007 11:44 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] Basic USB related Query.

Hi All,

I am asking about complete basics as to what kind of Major URB transactions will begin on a composite device considering usbccgp.sys driver as a generic device and no vendor drivers are involved. I am looking for something till the child drivers are loaded and functional.

Ex - A USB headset or a USB Webcamera with multiple interfaces.

I know this is not the place but it would really help if someone can explain or point me to some links.

Thanks in advance.

This message, together with any attachment(s), contains confidential and proprietary information of
ServerEngines LLC and is intended only for the designated recipient(s) named above. Any unauthorized
review, printing, retention, copying, disclosure or distribution is strictly prohibited. If you are not the
intended recipient of this message, please immediately advise the sender by reply email message and
delete all copies of this message and any attachment(s). Thank you.

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