Of the four possibilities two are broken in Android. There are two ways to transfer data in and out, asynchronously by queueing Requests and synchronously using the BulkTransfer method. The specific problems that beset the Android USB support concern data transfer. Erel has suggested that I post it anyway as it is probably usable in at least some situations. However it is unavoidably crippled by problems with the Android implementation of USB support and has been produced by reverse engineering a Linux driver as Prolific only provide chip operation details to their OEMs and do not publish an operation manual. This driver is not up to the standard that I would normally expect of myself. The driver requires version 0.92 or later of the USB Host library and needs a Honeycomb 3.1 or later device with USB host support. of Taiwan and is a very common chip to find in such adaptors. The PL2303 is a chip produced by Prolific Technology Inc. This is a driver for PL2303 based USB to RS232 adaptors.
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