[fprint] Device support

[Kunal Gangakhedkar]

On Tuesday 29 Jun 2010 10:15:43 pm Ray Lehtiniemi wrote:
> On 10-06-29 09:40 AM, Kunal Gangakhedkar wrote:
> > For starters, you can take a look at Ray's repo at:
> > http://github.com/rayl/vfs101driver
> >
> > This is not an fprint driver, but a set of tools he's working on to simulate
> > the protocol for the device.
> >    
> just as a quick status update,  the current code is able to configure 
> the device, enter a polling loop, and retrieve a single fingerprint into 
> a PNM file. for some reason the hardware seems to lock up at this 
> point.  once this lockup problem is solved, i think it will be fairly 
> easy (for someone who understands the fprint state machine model) to 
> take this code and produce an actual fprint driver.
>

If you're talking about the lock up in load() while reading the fingerprint, then
it's due to small buffer - I increased it to 4M instead of 1M and the program
ran to completion for me.

You can try the attached patch.

Kunal
 
> so if you're willing and able, please try out the code, try to reproduce 
> the lockup, and see if you can figure out why it's happening :-)
> 
> thanks
> ray
> 
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