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iafilatov / libfprint

libfrpint driver for a family of Elantech fingerprint sensors
https://cgit.freedesktop.org/libfprint/libfprint/
GNU Lesser General Public License v2.1
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Support for 2542 #13

Closed jpreston84 closed 6 years ago

jpreston84 commented 6 years ago

Hi,

I have an Asus Vivobook 14 Flip. It has an Elan fingerprint reader, which shows up as 04f3:2542. I was wondering how hard it would be to add support for this device to your driver.

Here's the output of lsusb...

Bus 002 Device 009: ID 0bda:8153 Realtek Semiconductor Corp. Bus 002 Device 008: ID 2109:0813 VIA Labs, Inc. Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 8087:0a2b Intel Corp. Bus 001 Device 004: ID 04f3:2542 Elan Microelectronics Corp. Bus 001 Device 003: ID 13d3:5a03 IMC Networks Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller Bus 001 Device 009: ID 2109:2813 VIA Labs, Inc. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Is there anything I can do to facilitate adding support for this device?

iafilatov commented 6 years ago

Hi,

I wrote up a how-to on adding new devices to the driver. If your reader responds in any way, then it could work. If not, it's probably an entirely different device with a different protocol, and this driver is useless for it.

jpreston84 commented 6 years ago

All right -- I followed your instructions (after installing a large number of dev packages). Here's what I got...

(venv) root@MyComputer:~/libfprint/builddir_dbg# examples/img_capture
Found device claimed by ElanTech Fingerprint Sensor driver
elan:error [dev_init] could not claim interface 0: LIBUSB_ERROR_BUSY
async:error [fp_async_dev_open] device initialisation failed, driver=elan
Could not open device.
(venv) root@MyComputer:~/libfprint/builddir_dbg#

Any thoughts on what to do next?

iafilatov commented 6 years ago

"Device busy" means it's already open by another driver. So it's not an fp reader. Maybe a touchpad. Or maybe scanner and touchpad register as a single device. Unfortunately, it's not possible to talk to such readers with libfprint.