linux-kernel - Re: USB controller status

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Message-ID: <20120117151423.GA11094@kroah.com>
Date:	Tue, 17 Jan 2012 07:14:23 -0800
From:	Greg KH <greg@...ah.com>
To:	Praveen kumar <chatpravi@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	kernelnewbies@...nelnewbies.org
Subject: Re: USB controller status

On Tue, Jan 17, 2012 at 07:26:24PM +0530, Praveen kumar wrote:
> Hi Greg,
> 
> What type of diagnostics are you trying to do?
>            I am trying to is to make communication to all the chips present on
> board (from kernel) and make sure all the input/output lines are working on
> that chip and the status of the configuration.
> As I am doing with the other chips like video controller ,audio controller etc
> ,I want to make sure the working condition of the USB controller and some tests
> to prove input and output lines are working and if possible loop back data
> test.

Good luck with that, it might be hard to do from within the kernel :)

> How can it not be configured correctly?
> 
> I am not sure in which condition the configuration of controller may fail but
> just I want to make sure the controller is configured properly.
> 
> You have looked at the debugfs files for the usb controllers for this
> type of thing already, right?
> 
> I have seen debugfs where I can dump all the configuration reg values ,but not
> sure to see which reg values to confirm  controller is configured properly.
> 
> Also I was trying to get the linux-usb project (http://sourceforge.net/apps/
> trac/sourceforge/wiki/Git) through git to make use of some code in there for
> some of the tests but I am not able to get it.
> Is there any alternative link from where I can get the code (like lsusb.c etc
> )..

usbutils are on github, look in your distro for the location of the
source.

greg k-h
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