[Wayland-bugs] [Bug 98770] kernel: Elantech 3320KD-3100 Touchpad behind [ASUS T300CHI DOCKING] Bluetooth not recognised

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98770

--- Comment #10 from Benjamin Tissoires <benjamin.tissoires at gmail.com> ---
(In reply to Tj from comment #8)
> I'm currently annotating the ACPI DSDT in case there are some Device/Methods
> which might give some additional clues (as you'll notice acpi_osi= is used
> here and causes several devices to show up that don't with a default OSI).

The DSDT won't be of any help here. It's a bluetooth keyboard, so everything
happens in the bluetooth and HID communication.

> 
> I also have the Windows Asus/Elan Tech Touchpad driver installer package
> extracted and am looking at it (basically AsusHID.sys) - will have more time
> to do some decent IDA analysis with it later.

No need to reverse engineer the source. You just need to dump the early traces
of the bluetooth communication when the Windows driver starts talking to the
device.

> 
> I'm guessing work needs to be done on the kernel driver side and have been
> getting familiar with the drivers/input/mouse/asus-* code in case some
> additions to the WMI device probes is where we need to start.

One thing that might be worth having a look at is if the current WIP driver for
some Asus touchpads wouldn't work for you.
The WIP is https://github.com/vlasenko/hid-asus-fte-dkms and the similarities
between your descriptor and this driver are big. The original kernel bug is
https://bugzilla.kernel.org/show_bug.cgi?id=120181

However, we would need to enhance the driver a little bit or your keyboard will
get disabled once the driver is started :)

So you might want to have a look first at their user space driver:
https://github.com/redmcg/FTE1001
This might tell us if your touchpad is compatible and if you need to get
involved in the development process of hid-asus.

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