From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Stern <stern@rowland.harvard.edu>
Subject: Re: Need help to understand USB driver mechanism
Date: Fri, 22 Jun 2012 09:48:53 -0400 (EDT)
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To: Vishal Nandanwar <operational.people@gmail.com>
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On Fri, 22 Jun 2012, Vishal Nandanwar wrote:

> Hi Alan,
> 
> Thanks for your reply. It really helps.
> 
> What approach one should use to learn the device drivers?

Many of the files in drivers/usb/misc would make a good place to start.  
You can also try to figure out the usblp driver.

Alan Stern