User space interface for GPIO interrupts

[Maverick Kuo]

Hi,

i am running 12.0-STABLE r348448 arm64 zfs root on raspberry pi3 b+.

Look at the kernel source and it seems that all the functions related to gpio
interrupt are available.

System startup about the gpio interrupt part process follow by

Bcm_gpio_intr_attach =>> Bus_setup_intr
?? bcm_gpio_intr_bank[0,1]
?? bcm_gpio_intr_internal

It seems that BCM_GPIO_GPEDS (Event Status) will be read in the
bcm_gpio_intr_internal function but it is not executed there.

am I missed something ??

but it still lack user space interface (kqueue/kevent) part, hope it will finish to reduce cpu loading.

Regards,
Chris

 

[Maverick Kuo]

Hi,

Good News !!

after cvs to 12.0-STABLE #0 r348527M GPIO Interrupt with kqueue Works !!!

Thanks to the developers

Regards,
Chris

 

[Maverick Kuo]

Sorry, I got it wrong, gpio interrupt is really available, BUT I forgot to have a patch that mixes https://github.com/ckraemer/freebsd/tree/gsoc2018

Just after the comparison was revised, I found out that I apologize again.

If you need a patch, please use the attachment.
This original source is gsoc2018 as above.

 

[Nicola Mingotti]

Hello Maverick Kuo , this is very interesting. I remember we were talking here about this missing capability in the BeagleBone a few months ago.

I am running 12-RELEASE. As far as you know is GPIO interrupt available in STABLE ? Is there some code snippet to show how to use it ?

bye
Nicola

 

[Maverick Kuo]

Hello Nicola Mingotti,

i use the #3 patch to 12-stable in my rpi3 b+ and test by this code https://github.com/ckraemer/gsoc2018-utils/blob/master/src/gpioc_intr_test.c
i works.

wish you can make it work in BeagleBone

Best Regards.

 

[aragats]

test by this code https://github.com/ckraemer/gsoc2018-utils/blob/master/src/gpioc_intr_test.c

Hi Maverick Kuo , have you tried the "signal-driven I/O" option? Does it work?

 

[aragats]

I just tried recompiling kernel with that patch, however, something is missing, I get many errors like:

/usr/src/sys/dev/gpio/gpioc.c:126:18: error: function 'gpioc_poll' has internal linkage but is not defined

 

[Maverick Kuo]

Hi Maverick Kuo , have you tried the "signal-driven I/O" option? Does it work?

i only test kqueue

 

[Maverick Kuo]

I just tried recompiling kernel with that patch, however, something is missing, I get many errors like:

/usr/src/sys/dev/gpio/gpioc.c:126:18: error: function 'gpioc_poll' has internal linkage but is not defined

maybe you should try cd /usr/src make clean ; and buildworld and buildkernel