Elantech trackpad driver

Development OS
1

I own a T480s which allegedly has a v4 Elantech trackpad (aka Clickpad) with firmware v. 0x7f3001.
I enabled the driver by returning B_OK from probe_elantech() but unfortunately after succesfully detecting it (the magic knock is accepted and the device returns a valid response) all I get in the syslog is:

KERN: ps2: hot plugin of input/touchpad/ps2/elantech_0
KERN: ps2: device input/touchpad/ps2/elantech_0 still active, republishing...
KERN: ps2: devfs_unpublish_device input/touchpad/ps2/elantech_0, status = 0x00000000
KERN: ELANTECH: fw 7F3001 hw 04.
KERN: ps2: devfs_publish_device input/touchpad/ps2/elantech_0, status = 0x00000000
USER 'KS': Notify of added/removed/started/stopped device
Last message repeated 1 time

several times and it seems that no other functions are called, not even elantech_open(). Could anyone shed a light on this? maybe @korli?

PS: please note that I’ve changed some traces and added the logic to retrieve and check the hardware version but none of these changes affect the behaviour.

2

Is the device visible in /dev/? If so, then the question would be why input_server didn’t open it.

3

Yes it’s published as elantech_0

4

Did you restart the input server?

5

I blocklisted the ps2 bus manager and let the system load it from non-packaged. I delete the syslog and reboot every single time to start afresh so I don’t need to restart the input server, do I?

6

The device is published under /dev/input/touchpad/ps2/elantech_0, is there anything that might prevent the input server from detecting it as a touchpad instead of a mouse?

7

From the log you posted, it looked like you replaced the driver during runtime, at least that’s how I read those unpublish driver lines. In any case, I have no idea why it wouldn’t pick it up, looking at its source might help, or try opening the driver manually.