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    SubjectRe: [PATCH] USB: Gadget: g_multi: added INF file for gadget with multiple configurations
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    On Sat, Aug 14, 2010 at 4:35 AM, Michal Nazarewicz <mina86@mina86.com> wrote:
    > Xiaofan Chen <xiaofanc@gmail.com> writes:
    >
    >> On Fri, Aug 13, 2010 at 5:31 PM, Dries Van Puymbroeck
    >> <dries.van.puymbroeck@gmail.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).
    >
    > 2-configuration g_multi has configuration with RNDIS as the first one so
    > that's pretty perfect for us.

    I guess so. But I am wondering if the inf file really needed or not
    in this case.

    Basically I am just wondering if the following statement is true or not.
    >>> 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

    And since 1st configuration RNDIS is what desired, nothing needs to be done.

    Obviously you have the device to test, I would be interested to know your
    test results under XP, Vista and Win7.

    --
    Xiaofan


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