On August 17, 2026 11:22:00 PM GMT+03:00, Matthew Grooms <[email protected]>
wrote:
>On 8/17/26 15:06, Ruslan Zalata wrote:
>> Thanks Matt. That's on FreeBSD, I suppose? Would like to have this type of
>> service on x86 mini-PCs. :)
>>
>> ---
>> Regards,
>> Ruslan
>>
>> On 2026-08-18 00:08, Matthew Grooms wrote:
>>> On 8/16/26 12:13, Ruslan Zalata wrote:
>>>> Hello Sulev-Madis,
>>>>
>>>> What's your target platform ?
>>>>
>>>> I recently discovered that GPIO interrupts are not supported in "GPIO Bus"
>>>> driver on x86 platforms because of lack of INTRNG support (simply not
>>>> implemented). I found a 6-year old diff D26407 from avg@ to add this
>>>> functionally which stuck on review because of some unsolved issues. I
>>>> renewed avg's patch so it could be applied to -current and posted for
>>>> review (D57968) again, but it did get much traction too. So, if you are
>>>> interested in getting GPIO interrupts on x86/amd64 - no luck till gpiobus
>>>> driver is "fixed". No ideas about arm and others.
>>>>
>>> Just as a reference point, I use the gpio interrupt support on rpi4
>>> hosts to track things like water flow for feed systems in an
>>> industrial farm environment. Seems to work quite well.
>
>Yup. I have 10x rpi4b systems running FreeBSD 14 in production, They run a
>custom farm automation controller I wrote a while back in c++. The demo code
>that accompanied the original gpio interrupt patch was used as a reference for
>that specific feature. Not sure that code ever made it into the source tree.
>
>-Matthew
>
>PS: Maybe try not to top post on the list.
>
>
that's what i'm talking about!!!
i want to play with water using allwinners. so a 32/64bit arms not really
limited to that tho
i resorted to llm code generation because i couldn't find an example
the resulting "FreeBSD userland GPIO interrupt watcher with trailing-edge
debounce." could be written by humans too. in fact they once did. i found
scattered code from somewhere
all i had was 12 year old gpio interrupt code i modified (iirc i debounced in
perl) and a test in tree which i found when i grepped a tree for strings
i apparently still haven't learned more c and i turn those c forked children
which stdin/out/err i watch in perl using poe/anyevent
it seems to run well with lot of room to spare on nowadays socs
i wish the examples or simple code would be somewhere i can find it
i think i got my 2026-updated gpio-fu (back) but what about others
so 12y ago i didn't contribute it in and nobody else did either. maybe it
should be done now
there's nothing gpio related in examples it seems, i went there quite early
so unsure how i'm going to complete my task. but then i want to share it
was told it's trivial. well it's trivial after you learned it
