Linux USB Documentation

Dear All,

I am a Linux device driver developer. I have developed the USB client
driver in the Linux environment. For this, I have followed the Rubini's
3rd Edition LLD book. Now I want to know the interaction among the Linux
OS, USB Stack and HCD (Host Controller Driver). I mean, what are the
modules exists in the stack and how they interacts with the OS as well
as HCD? Suppose, how the HCD driver intimates the stack about when a new
device attached to the host controller? I think, it is through some
event mechanism, but I need code flow.

I have some experience in HCD development in the Nucleus and it looks
like as shown below.

Application
	|
Nucleus OS
	|
Class Drivers
	|
USB Core (USB Stack)
	|
Host Controller Driver (HCD)
	|
Host Controller (Hardware)
	|
USB Device

Here, in Nucleus, the HCD driver intimates the stack about a new device
attachment through pending IRP mechanism. 

I have gone through the following links.
http://www.linux-usb.org
http://www.linux-usb.org/USB-guide/book1.html
http://it.linux-usb.org/FAQ.html
http://tldp.org/
http://www.tux.org/lkml/index.html
http://www.linux-usb.org/usb2.html

I did not get the information that I need (that is flow among OS, Stack
and HCD). All these links have old information and I am looking into the
latest kernel version 2.6.22.

So I would be happy if you could provide me some pointers (links) or
some good explanation on it.

Thanks in advance.

Regards,
Srinivas G




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