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

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Message-ID: <87r5i1h9lh.fsf@erwin.mina86.com>
Date:	Sat, 14 Aug 2010 10:39:06 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Xiaofan Chen <xiaofanc@...il.com>
Cc:	Dries Van Puymbroeck <dries.van.puymbroeck@...il.com>,
	linux-usb@...r.kernel.org, Greg KH <greg@...ah.com>,
	Michał Nazarewicz 
	<m.nazarewicz@...sung.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

Xiaofan Chen <xiaofanc@...il.com> writes:
> Basically I am just wondering if the following statement is true or not.

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

> I am thinking the inf file is not necessary.
> "When the system detects that a USB device is composite, it loads the
> USB common class generic parent driver (usbccgp.sys)."
> http://msdn.microsoft.com/en-us/library/ff538059%28VS.85%29.aspx

<http://msdn.microsoft.com/en-us/library/ff537109(v=VS.85).aspx>
specifies that for a device to be identified as composite it (among
other things) "must have a single configuration".  The page has also
a passage which seems to indicate that the INF is needed:

> If you want the generic parent driver to manage your device, but your
> device does not have the characteristics necessary to ensure that the
> system will generate a compatible ID of USB\COMPOSITE, you will have
> to provide an INF file that loads the generic parent driver.

Selecting of the configuration is also mentioned as a requirement, and
the next paragraph points to a web page you've cited:

> If your composite device has multiple configurations, the INF file you
> provide must specify which configuration the generic parent should use
> in the registry. The necessary registry keys are described in
> Selecting the Configuration for a Composite USB Device.

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