netdev - Re: [PATCH] net/usb: Add Samsung Kalmia driver for Samsung GT-B3730

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Date:	Mon, 13 Jun 2011 10:19:23 -0500
From:	Dan Williams <dcbw@...hat.com>
To:	Marius Kotsbak <marius.kotsbak@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org, "Marius B. Kotsbak" <marius@...sbak.com>
Subject: Re: [PATCH] net/usb: Add Samsung Kalmia driver for Samsung GT-B3730

On Mon, 2011-06-13 at 17:01 +0200, Marius Kotsbak wrote:
> On 13. juni 2011 16:57, Dan Williams wrote:
> > On Sat, 2011-06-11 at 01:34 +0200, Marius B. Kotsbak wrote:
> >> Introducing driver for the network port of Samsung Kalmia based USB LTE modems.
> >> It has also an ACM interface that previous patches associates with the "option"
> >> module. To access those interfaces, the modem must first be switched from modem
> >> mode using a tool like usb_modeswitch.
> >>
> >> As the proprietary protocol has been discovered by watching the MS Windows driver
> >> behavior, there might be errors in the protocol handling, but stable and fast
> >> connection has been established for hours with Norwegian operator NetCom that
> >> distributes this modem with their LTE/4G subscription.
> > Why make the driver bind to both the switched and unswitched USB IDs?
> > Shouldn't the kernel bind the driver after switch when the device
> > reconnects with the new IDs?
> 
> No, I tried and it did not happen, so I assumed that the kernel modules
> are only loaded at USB insertion event, not when the interfaces changes.
> Does anyone here know if my observation is right?
> 
> Usb_modeswitch autoloads "option" module after switching, but not my
> kalmia module.

Try killing the modeswitch autoload thing first by moving the udev
script out of the way.  Then plug your device in, and run
"usb-modeswitch -c /path/to/config" so that the usb_modeswitch autoload
thing doesn't run.  Does that work?  I don't want to slander
usb_modeswitch but I've seen some odd behavior which I suspect is it's
module force-loading feature, though I haven't investigated too much
yet.  But ruling that out could be helpful.

Dan


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