linux-kernel - Re: ASUS ScreenDuo

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Date:	Fri, 04 Apr 2008 17:43:54 +0200
From:	Xavier Bestel <xavier.bestel@...e.fr>
To:	Bob Copeland <me@...copeland.com>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ASUS ScreenDuo


On ven, 2008-04-04 at 11:22 -0400, Bob Copeland wrote:
> On Fri, Apr 4, 2008 at 10:55 AM, Xavier Bestel <xavier.bestel@...e.fr> wrote:
> >  > If it is supposed to implement the MS SideShow API, then that would be
> >  > the .NET VM (i.e. C#).  My 10 second googling turned up some info about
> >  > that but I couldn't find a definition of how the hardware interface
> >  > for such devices is supposed to work.  There's some XML-laden software
> >  > API but it seemed to be transport agnostic.
> >
> >  Wouldn't there be at least 2 interfaces to the device ?
> 
> Who knows, they could have a almost-mass-storage protocol layer that
> recognizes proprietary stuff in the URBs.  It could be as simple as:
> 
>  - User clicks 'synchronize' in some windows app
>  - Device driver on host does some magic to make Asus device pretend like
>    removable media was inserted
>  - Vista sees the new device, mounts it
>  - App copies C# classes and XML files to special directories on the device
>  - App ejects device

Fair enough.

> Does the screen turn on or is that software controlled too?

There's a power-on button, which lits the screen and makes the device
connect to the usb host.

> This is pure wild guessing since I have no clue about SideShow or this
> device.  Anyway it would be hard to proceed without capturing a trace
> or managing to find some docs somewhere.

I certainly have no intention of installing vista on this host. I'll see
if I manage to borrow a windows laptop somewhere.

Thanks,
	Xav


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