linux-kernel - Re: ASUS ScreenDuo

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Date:	Fri, 4 Apr 2008 11:22:52 -0400
From:	"Bob Copeland" <me@...copeland.com>
To:	"Xavier Bestel" <xavier.bestel@...e.fr>
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 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

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

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.

-Bob
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