psm(4) support for Elantech touchpads

[Malcolm Matalka]

Vladimir Kondratyev <wulf at cicgroup.ru> writes:

> On 2016-07-04 00:15, Vladimir Kondratyev wrote:
>> On 2016-07-03 21:50, Matthias Apitz wrote:
>>> Hello Vladimir,
>>>
>>> I own an Acer C720 (aka Chromebook) which worked fine concerning the
>>> touchpad with the cyapa driver in CURRENT. After a repair in Acer.com
>>> they said that they have had to change the keyboard and the touchpad and
>>> it now does not attach anymore to the cyapa.ko; it seems that it was
>>> replace by an Elan TP and while googlöing for support I found your
>>> posting from September 2015. I have applied the patch to r292778 but the
>>> code is not walked through because it says on verbose boot:
>>>
>>> atkbd0: [GIANT-LOCKED]
>>> random: harvesting attach, 8 bytes (4 bits) from atkbd0
>>> psm0: unable to allocate IRQ
>>>
>>> Any ideas about this? Thanks in advance
>>>
>>> 	matthias
>>
>> Hi, Matthias
>>
>> I`m afraid that device resource management is not what I`m familiar with. Sorry.
>> Mouse type detection starts 200 lines below IRQ initialization so this
>> message should not depend on my patch.
>> Quick googling shows that this is most probably an ACPI issue but that
>> all I was able to find
>>
>> WBR, Vladimir Kondratyev
>>
>
> After some investigations its turned out that some modern ElanTPs use I2C interface not PS/2
> so they can not be handled with my patch. Its necessary to port new driver from Linux
> https://lwn.net/Articles/496137/ or from OpenBSD where it has name
> imt(4)

I'd like to try to port this driver over to FreeBSD, does anyone have
any suggestions of something to read or willing to help mentor me in
that?  I know nothing about doing this but would really like to get my
Trackpad working!


>
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