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

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Date:	Mon, 13 Jun 2011 17:01:42 +0200
From:	Marius Kotsbak <marius.kotsbak@...il.com>
To:	Dan Williams <dcbw@...hat.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 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.

--
Marius


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