linux-kernel - Re: [PATCH] USB: Gadget: g_multi: added INF file for gadget with multiple configurations

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Message-ID: <AANLkTikk7T6v8zwzEQuZ7yDgf6AcdEfNJr7BG+z1O02n@mail.gmail.com>
Date:	Fri, 13 Aug 2010 21:31:46 +0800
From:	Xiaofan Chen <xiaofanc@...il.com>
To:	Dries Van Puymbroeck <dries.van.puymbroeck@...il.com>
Cc:	linux-usb@...r.kernel.org, Greg KH <greg@...ah.com>,
	Michał Nazarewicz <m.nazarewicz@...sung.com>,
	Michał Nazarewicz <mina86@...a86.com>,
	Dries Van Puymbroeck <dries.vanpuymbroeck@...imo.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: Gadget: g_multi: added INF file for gadget with
 multiple configurations

On Fri, Aug 13, 2010 at 5:31 PM, Dries Van Puymbroeck
<dries.van.puymbroeck@...il.com> wrote:
> When a mutlifunction gadget has more than 1 configuration, Windows does not
> use its generic driver for multifunctional USB devices.

Sorry but what do you mean by the above?
As per the previous discussions, it seems that a registry entry hack
(for Vista and Windows 7) is needed.
http://msdn.microsoft.com/en-us/library/ff538059%28VS.85%29.aspx

> This commit adds an INF file that will load the required Windows driver
> as well as a short description in gadget_multi.txt

It seems to me your inf file forces the USB Generic
Parent Driver (for USB Composite Device) to load. But for which
configuration? I do not have any device to test myself. But
I tend to guess it will still be the first configuration (either
RNDIS or CDC ECM).

I did see something similar for WMCDC.
http://msdn.microsoft.com/en-us/library/ff538833%28VS.85%29.aspx
http://msdn.microsoft.com/en-us/library/ff537100%28v=VS.85%29.aspx

-- 
Xiaofan
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