Re: USB gadget with drivers "on board"
From: MichaÅ Nazarewicz
Date: Wed Apr 28 2010 - 07:31:29 EST
On Mon, 26 Apr 2010, Josua Dietze wrote:
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.
Alan Stern schrieb:
I was going to say the same thing. For ease of use, I recommend using
a "SCSI eject" to trigger the mode change. That way, Linux users who
don't have the usb-modeswitch program installed can get the same effect
by running eject.
On Wed, 28 Apr 2010 10:46:12 +0200, MichaÅ Nazarewicz <m.nazarewicz@xxxxxxxxxxx> wrote:
Also, I think that it might be a good idea to make some "standardised"
mechanism for all such devices so that a generic udev code could be
written. Adding things to the descriptors may be difficult in a way,
but maybe adding "[NoCD]" to the interface name would be enough.
It got me thinking that maybe, it would be cool to do things in a generic
way in Linux by using the iConfiguration. A, let's call it' NoCD-capable
device would have the first configuration named "Foo Installation Disc
[NoCD]" end while enumerating Linux would prefer configurations which
don't have the tag over the ones that have it. At the same time, for
older kernels an udev rule would be provided. And of course, non
NoCD-capable devices (or Linux-unaware if you will) devices would be
handled the way they are handled now.
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Best regards, _ _
| Humble Liege of Serenely Enlightened Majesty of o' \,=./ `o
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