Re: intr notification when a gpio changes?

On June 15, 2026 2:21:53 AM GMT+03:00, "Bjoern A=2E Zeeb" <bzeeb-lists@lis=
ts=2Ezabbadoz=2Enet> wrote:
>On Sun, 14 Jun 2026, Ahmad Khalifa wrote:
>
>> On Mon Jun 15, 2026 at 2:05 AM +0300, Sulev-Madis Silber wrote:
>>> On June 15, 2026 1:53:11 AM GMT+03:00, Ahmad Khalifa <ahmadkhalifa570@=
gmail=2Ecom> wrote:
>>>> On Mon Jun 15, 2026 at 12:28 AM +0300, Bjoern A=2E Zeeb wrote:
>>>>> Hi,
>>>>>=20
>>>>> sorry for asking here but I figured most knowledgeable people will b=
e here=2E
>>>>>=20
>>>>> I need to be able from a kernel driver to get a notification if a gp=
io
>>>>> pin changes=2E
>>>>>=20
>>>>> I believe to understand that from userspace GPIOSETCONFIG can do the=
 job,
>>>>> but what's in-kernel API I am looking for?
>>>>=20
>>>> You can call gpio_alloc_intr_resource to get an interrupt resource, t=
hen
>>>> use bus_setup_intr like normal to setup an interrupt=2E
>>>>=20
>>>> Note that this only works on INTRNG platforms currently=2E There are =
no
>>>> GPIO interrupts on amd64=2E
>>>>=20
>>>> sys/dev/gpio/gpioaei=2Ec is a good example of setting up GPIO interru=
pts=2E
>>>>=20
>>>>>=20
>>>>> /bz
>>>>=20
>>>=20
>>>=20
>>> let me hop on this wagon=2E what is the userland option to watch gpios=
? i'm talking about something that could run shell scripts=2E ot be opened =
as some device that outputs events
>>>=20
>>> from 10 years ago i modified someone's c example for that
>>>=20
>>> could be nice addon to gpioctl=2E of course if i'm blind and it's ther=
e, point me to it
>>=20
>> No way to do it with gpioctl AFAIK, but there's tools/test/gpioevents i=
n
>> src=2E
>
>I do not know what happened to https://wiki=2Efreebsd=2Eorg/SummerOfCode2=
018Projects/UserSpaceGPIOinterrupts ?
>

yeah my

<http://ketas=2Esi=2Epri=2Eee/bbb/bbb-poe-daemon/util/gpio-intr-kqueue=2Ec=
>

and

<http://ketas=2Esi=2Epri=2Eee/bbb/bbb-poe-daemon/util/gpio-irq-event=2Ec>

probably came from somewhere there=2E it's from loos@=2E it worked=2E but =
not in tree anywhere? maybe it should be somewhere=2E i don't know where it=
 will belong nor do i know what's the best way=2E those files are literally=
 12 years old=2E i haven't looked into bugzilla but i would not be surprise=
d if some code is in there too, sitting half way implemented=2E anyway i ha=
ve interest in userspace gpiowatch=2E could be both polling and interrupt=
=2E the interrupts would be preferred=2E but i understand that it's support=
 depends on certain fragile hw supports and be limited on pins or their cou=
nt=2E or that's how i understand this=2E maybe kernel created devices could=
 work=2E or maybe forked listening procs=2E i realize that this is slower b=
ut it's a start