From: Josua Dietze <digidietze@draisberghof.de>
To: "Michał Nazarewicz" <m.nazarewicz@samsung.com>
Cc: Daniel Mack <daniel@caiaq.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
Kyungmin Park <kyungmin.park@samsung.com>
Subject: Re: USB gadget with drivers "on board"
Date: Mon, 26 Apr 2010 19:37:00 +0200 [thread overview]
Message-ID: <4BD5CF3C.9020406@draisberghof.de> (raw)
In-Reply-To: <op.vbr0prfb7p4s8u@pikus>
Michał Nazarewicz schrieb:
> On Mon, 26 Apr 2010 16:16:05 +0200, Daniel Mack <daniel@caiaq.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
next prev parent reply other threads:[~2010-04-26 17:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-26 8:29 USB gadget with drivers "on board" Michał Nazarewicz
2010-04-26 14:16 ` Daniel Mack
2010-04-26 14:42 ` Michał Nazarewicz
2010-04-26 14:57 ` Daniel Mack
2010-04-26 15:45 ` Michał Nazarewicz
2010-04-26 17:37 ` Josua Dietze [this message]
2010-04-26 19:34 ` Alan Stern
2010-04-26 20:14 ` Josua Dietze
2010-04-28 8:46 ` Michał Nazarewicz
2010-04-28 11:31 ` Michał Nazarewicz
2010-04-28 11:41 ` Josua Dietze
2010-04-28 11:54 ` Michał Nazarewicz
2010-04-28 15:59 ` Alan Stern
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