[fprint] Help with reader.

[Vasily Khoruzhick]

Hi Arjoonn,

On Tue, Dec 29, 2015 at 1:02 AM, Arjoonn Sharma <arjoonn.94 at gmail.com>
wrote:

> Hi Martin,
> I am new to this so please excuse the clumsiness.
>
> lsusb returns
> Bus 001 Device 003: ID 138a:0005 Validity Sensors, Inc. VFS301 Fingerprint
> Reader
>
> fprintd-0.6.0-1 is installed from AUR which I believe is the Git master.
>
> on running fprintd-enroll the following happens:
>
> ```
> Using device /net/reactivated/Fprint/Device/0
> Enrolling right-index-finger finger.
> Enroll result: enroll-stage-passed
> ```
>
> The program never goes beyond that.
>

Looks like vfs301 support is broken in recent libfprint. Looking at the
code it's not surprising.
vfs301 driver just stops after scanning a single image, while libfprint
core doesn't expect it. Moreover, this driver doesn't support
proper deactivation, i.e. it's not possible to cancel an operation in
progress. Unfortunately, I have no vfs301, so someone with
device should fix the driver and submit a patch.

Regards,
Vasily


>
> Sincerely,
> Arjoonn Sharma
>
> On Tue, Dec 29, 2015 at 2:26 PM, Martin Hejnfelt <martin at duffman.dk>
> wrote:
>
>> Hi Arjoonn,
>>
>> On Mon, 2015-12-28 at 23:17 +0530, Arjoonn Sharma wrote:
>> > Hello,
>> >
>> > I have a device prebuilt into my laptop
>> >
>> It's always nice to get some USB information, usually lsusb output gives
>> a good idea about the device...
>>
>> > which has denied all my efforts to get it to work under Linux.
>> >
>> > I am not sure if this is the right place to ask, but I do not know
>> > where else to ask.
>> >
>> >
>> > Now after installing libfprint and fprintd through various paths
>> > (apt-get , building, etc)
>> >
>> Which versions have you been using? Building from git master or? The
>> packaged versions with many distros are oooooold...
>>
>> > whenever I try to enroll the fingers, the scanner scans the finger
>> > once, then gets stuck
>> >
>> > at the second scan.
>> >
>> I've had a similar issue with a Digital Persona device. It was resolved
>> long ago in the official code repository
>>
>> http://cgit.freedesktop.org/libfprint/libfprint/commit/?id=9f408bf51b7740e87c3d0b90e5adc5de3c37c052
>>
>> I don't know if you are seeing the same issue, but in order to help,
>> more information about device would be nice...
>>
>> Best regards,
>> Martin
>>
>>
>>
>
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>
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