[remarkable2 support]: change event files based on rM version

[mcw-h]

remarkable2 uses /dev/input/event1 (from /dev/input/event0)

open_remote_device already allows changing the file path so this just pushes that option up to the command line arguments.

Also move the logging setup before calling open_remote_device otherwise debug in that function doesn't work.

[chabad360]

Why not just add a --rm2 switch?

[mcw-h]

Why not just add a --rm2 switch?

I thought of that but then when there's an rm3, or other device that uses the same digitiserthingie... I honestly have no real convictions either way.

[jonahweissman]

I think a more convenient solution would be to detect the current version of the hardware, and automatically read from the correct device. There might be a better way to do this, but I was thinking we could check the contents of /proc/cpuinfo, since this shouldn't be affected by the version of the software.

[Evidlo]

I think a more convenient solution would be to detect the current version of the hardware, and automatically read from the correct device.

I agree with this. I'd prefer to make the user experience seamless.

Here is a relevant issue on Oxide: Eeems-Org/oxide#48

[Stivanification]

So it seems the best way to recognize which reMarkable one uses, according to the discussion here, is via cat /sys/devices/soc0/machine. So all that needs to be done is to select the event file depending on the output of that command, or am I missing something?

[raisjn]

imo, you should use ioctl to detect which device is the stylus.,see this gist from oxide thread

Eeems-Org/oxide#48 (comment)

this will be more future proof than picking based on current device name

[Evidlo]

@raisjn The problem is that remouse runs entirely on the host, and I'm not sure if shipping an ARM binary for the ioctl probing is worth the added complexity of distributing, installing and executing the binary.

[raisjn]

ah, good point! shipping the arm binary is likely not worth it, i thought you are using libevdev but it's only on the host

[Evidlo]

See the rm2 branch, which tries to detect the version automatically from /dev/input/touchscreen0.