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The FunctionFS gadget may provide the source/sink interface not as the first interface (with id == 0) but some different interface hence a code to find the interface number is required. (Note that you will still configure the gadget to report idProduct == 0xa4a4 (an "echo 0xa4a4 >/sys/module/g_ffs/parameters/usb_product" should suffice) or configure host to handle 0x0525:0xa4ac devices using the usbtest driver.) Signed-off-by: Michal Nazarewicz <[email protected]> Cc: Kyungmin Park <[email protected]> Cc: Marek Szyprowski <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>