Hi Bastien, Thanks for your detailed reply!
Unfortunately, our "match on chip" device need to load template from disk, it does not have persistent storage.. I think we will need your help as below to implement "update template": 1. The way which can transfer updated template from driver to verify/identify AP through libfprint 2. the verify/identify AP in fprintd need to store the updated template into disk Any suggestion or help will be really appreciate. Best regards, Dave -----Original Message----- From: Bastien Nocera [mailto:had...@hadess.net] Sent: Wednesday, January 23, 2019 10:12 PM To: Dave.Wang <dave.w...@emc.com.tw>; fprint@lists.freedesktop.org Subject: Re: [fprint] Would you please help to create the function to update the template for "verify" and "identify"? Hello Dave, Sorry about the late reply. On Wed, 2019-01-02 at 10:58 +0800, Dave.Wang wrote: > Dear, > > 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 "fp_async_verify_start" call. 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 fp_async_verify_stop() result. 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. Cheers _______________________________________________ fprint mailing list fprint@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/fprint
