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:

quoted

On Sat, 2011-06-11 at 01:34 +0200, Marius B. Kotsbak wrote:

quoted

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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