[fprint] upek 147e:2016 reverse engineering progress

[Daniel Drake]

Daniel Drake wrote:
>> I just spent some time sniffing what UPEK's new libbsapi is doing, and 
>> produced a libusb-1.0 app to do the same. It works - it captures image 
>> data. I'm not totally clear on the format, but the output file looks 
>> quite nice when plotted as 8 bit greyscale with a width of 2306 pixels 
>> (although the fingerprint is repeated).
> 
> Updated version attached which works from cold boot. Also it now uses 
> the hardware's finger detection capability and deinitializes the device 
> after the scan.

Another version which includes finger-removal detection and outputs 
coherent images in pgm format. yay.

That was less effort than expected. I've mostly finished converting this 
to a libfprint driver as well, expect that in the next few days.

Daniel
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