Re: [PATCH 2/2] gpio: sch: Add interrupt support

Mika Westerberg
2019-04-24T10:01:55Z

On Wed, Apr 24, 2019 at 11:48:09AM +0200, Jan Kiszka wrote:
> On 24.04.19 11:45, Mika Westerberg wrote:
> > On Wed, Apr 24, 2019 at 11:36:58AM +0200, Jan Kiszka wrote:
> > > OK, there is that table, but what is it supposed to tell me about the
> > > event and where to hook into it better?
> > ...
> > > [02Eh 0046 2] SCI Interrupt : 0009
> >
> > This is the SCI interrupt GSI number. IIRC it maps 1:1 to Linux
> > interrupt number so you should see it in /proc/interrupts. When a GPE
> > event is triggered it should be handled in the ACPI core.
> >
>
> Yes, clear, all this happens already. But I need to link the core with the
> sch gpio handler so that the gpio event is filtered out and the right
> virtual gpio interrupt is triggered. So, other than
> acpi_install_sci_handler, how should I establish that link?

I think what you want is "GPIO signaled ACPI event". It works so that
you declare _AEI method below the GPIO controller listing the GPIOs you
want to trigger events for and then either _Lxx, _Exx or _EVT method for
each of them under the same controller. GPIO core then handles it
automatically when you register the GPIO chip. See also
acpi_gpiochip_request_interrupts().