linux-kernel - Re: Add the infamous Huawei E220 to option.c

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Message-ID: <20071129141444.GA27279@gamma.logic.tuwien.ac.at>
Date:	Thu, 29 Nov 2007 15:14:44 +0100
From:	Norbert Preining <preining@...ic.at>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	linux-usb@...r.kernel.org, kristoffer.ericson@...il.com,
	drussell@...hat.com, johann.wilhelm@...dent.tugraz.at,
	linux-kernel@...r.kernel.org
Subject: Re: Add the infamous Huawei E220 to option.c

Hi Pete, hi all,

On Mi, 28 Nov 2007, Pete Zaitcev wrote:
> It looks like the Huawei E220 saga is not over yet. A collegue of mine,
> David Russll, reported that the modem does not work reliably on Fedora 8,
> which does have the initializer in usb-storage.

That is what I said.

> it's random which wins. If usb-storage wins, everything is fine. If option
> wins, it binds to modem still in storage mode and does not work.

That could be the source of my disconnect/reconnect cycles.

> This way no matter which driver wins the modem gets initialized. The
> patch is tested on David's modem, but I would like someone give it more
> testing.
> 
> I dunno, do we want some kind of code sharing between storage and option?
> They both could use the normal usb_control_msg, I think.
> 
> Also, from archives it looks like Johann may need PID 0x1004 added.
> 
> Since we're on topic, David's modem has exactly same IDs as Norbert's,
> but works fine with the length of 1. Although it's possible that the
> firmware is different without different firmware reported in USB desc-
> riptors. Does anyone know a magic AT command? ATI or something?
> Norbert, please try my patch, maybe it'll work this time.

I tried your patch with the reverted 0x1 -> 0 change. But it didn't
work. I get connects/reconnects.

So to be clear: kernl 2.6.24-rc3 + your patch gives me permanent cycles
and an error:
	option_start_huawei: HUAWEI E220 setup failed (1)
I attach the syslog part which exhibits the behaviour.

> And finally, pleas stop using that script from the polish website and

Did it already, but without the 0x1->0 change it does not work here.

> above all quit using the generic serial subdriver. The option must

Long done, I assume that the option module depending on usbserial is not
the problem.

> work now with the patch. Please let me know if it fails.

It does.

Best wishes

Norbert

-------------------------------------------------------------------------------
Dr. Norbert Preining <preining@...ic.at>        Vienna University of Technology
Debian Developer <preining@...ian.org>                         Debian TeX Group
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