[fprint] Would you please help to create the function to update the template for "verify" and "identify"?
hadess at hadess.net
Wed Jan 23 14:12:05 UTC 2019
Sorry about the late reply.
On Wed, 2019-01-02 at 10:58 +0800, Dave.Wang wrote:
> We want to implement the primitive driver which will use our "match
> on chip" sensor.
> Our "match on chip" sensor has function which can update the template
> after obtaining matched result for "verify" or "identify". It will
> make better performance.
Is there persistent storage on the device, or would you need to "load"
some data from the disk?
> As I know, the template located in "/var/lib/fprint/.. " is only
> stored by "fprintd-enroll" now.
> Would you please help to create the function to update the template
> for "verify" and "identify"?
The driver does not know how to load or save data to disk.
The enrolling process will give out a "struct fp_print_data" variable
that the front-end (usually fprintd) can save to disk, and which the
front-end will load from disk to pass to the driver for each
There currently isn't any way for the driver to modify that data that
was saved once during enrollment, but I would imagine that it could be
possible to pass that data back to fprintd via the
Is there any way you could try implementing your driver without that
feature first, and then we can figure out how to implement the template
update on disk.
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