linux-kernel - Re: USB gadget with drivers "on board"

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Message-ID: <4BD5CF3C.9020406@draisberghof.de>
Date:	Mon, 26 Apr 2010 19:37:00 +0200
From:	Josua Dietze <digidietze@...isberghof.de>
To:	Michał Nazarewicz <m.nazarewicz@...sung.com>
CC:	Daniel Mack <daniel@...aq.de>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: USB gadget with drivers "on board"

Michał Nazarewicz schrieb:

> On Mon, 26 Apr 2010 16:16:05 +0200, Daniel Mack <daniel@...aq.de> wrote:
>> Are you sure they don't do exactly that by running two interfaces in
>> the same configuration?
> 
> Yes, I'm sure.  I've investigated an USB GSM modem which, when plugged
> for the first time reports as mass storage (single configuration, single
> interface) and when drivers are installed as a full blown composite
> gadget.  I still haven't figured out how it does that.


These are the notorious mode switching devices. In Windows, they 
obviously install a special storage driver doing one specific action 
on each following plugging.
This action - some storage or control command - will "flip" the 
device, making it "disconnect" and returning as a completely different 
composite device.

Storage commands used for this procedure range from "SCSI rezero" over 
"passthrough" to "SCSI eject", or involve vendor specific stuff.


Josua Dietze

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