Question about USB interface index restriction in gspca

[Frank Schäfer <fschaefer.oss@xxxxxxxxxxxxxx>]

Hi,

I have a question about the following code in gspca.c:

in function gspca_dev_probe(...):
    ...
    /* the USB video interface must be the first one */
    if (dev->config->desc.bNumInterfaces != 1
&& intf->cur_altsetting->desc.bInterfaceNumber != 0)
            return -ENODEV;
    ...


Is there a special reason for not allowing devices with USB interface 
index > 0 for video ?
I'm experimenting with a device that has the video interface at index 3 
and two audio interfaces at index 0 and 1 (index two is missing !).
And the follow-up question: can we assume that all device handled by the 
gspca-driver have vendor specific video interfaces ?
Then we could change the code to

    ...
    /* the USB video interface must be of class vendor */
    if (intf->cur_altsetting->desc.bInterfaceClass != 
USB_CLASS_VENDOR_SPEC)
            return -ENODEV;
     ...

Regards,
Frank


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