Messages in this thread | | | From | Linus Walleij <> | Date | Tue, 8 Dec 2020 10:38:43 +0100 | Subject | Re: Howto listen to/handle gpio state changes ? Re: [PATCH v2 2/2] drivers: gpio: add virtio-gpio guest driver |
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On Sat, Dec 5, 2020 at 9:15 PM Enrico Weigelt, metux IT consult <lkml@metux.net> wrote:
> The virtio-gpio device/host can raise a signal on line state change. > Kinda IRQ, but not actually running through real IRQs, instead by a > message running though queue. (hmm, kida MSI ? :o). > > I've tried allocating an IRQ range and calling generic_handle_irq(), > but then I'm getting unhanled IRQ trap.
This is Bartosz territory, but the gpio-mockup.c driver will insert IRQs into the system, he went and added really core stuff into kernel/irq to make this happen. Notice that in Kconfig it does:
select IRQ_SIM
Then this is used: include/linux/irq_sim.h
This is intended for simulating IRQs and both GPIO and IIO use it. I think this inserts IRQs from debugfs and I have no idea how flexible that is.
If it is suitable for what you want to do I don't know but it's virtio so...
Yours, Linus Walleij
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