Hi All,
I am looking for ways to wakeup any devices (from sleep) using any
arbitrary gpio wakeup method in a generic way (either from user space
or kernel space) that should work on any kernel version (starting from
4.14 onwards).
What are the options available right now ?
I wanted to experiment with all of them and decide which is best for us.
Is /sys/class/gpio/ method still valid with the latest kernel ?
Or is there any other method to do it from user space ?
One option I know is to use enable/disable_irq_wake() API from kernel
driver suspend/resume path.
Just like this:
https://lwn.net/Articles/569027/
But this requires an additional kernel driver and device-tree changes
for each gpio wakeup, which the end-user needs to implement on their
own.
Is there any other existing generic mechanism?
Thanks,
Pintu
On Tue, 9 Jun 2020 at 23:06, Pintu Agarwal <[email protected]> wrote:
>
> Hi All,
>
> I am looking for ways to wakeup any devices (from sleep) using any
> arbitrary gpio wakeup method in a generic way (either from user space
> or kernel space) that should work on any kernel version (starting from
> 4.14 onwards).
>
> What are the options available right now ?
> I wanted to experiment with all of them and decide which is best for us.
>
> Is /sys/class/gpio/ method still valid with the latest kernel ?
> Or is there any other method to do it from user space ?
>
> One option I know is to use enable/disable_irq_wake() API from kernel
> driver suspend/resume path.
> Just like this:
> https://lwn.net/Articles/569027/
>
> But this requires an additional kernel driver and device-tree changes
> for each gpio wakeup, which the end-user needs to implement on their
> own.
>
> Is there any other existing generic mechanism?
>
https://embeddedbits.org/new-linux-kernel-gpio-user-space-interface/
Is it possible to achieve this using this new interface ?
And I think another option is to use gpio-keys defined in device-tree.
Will this method work for any wake-capable gpio ?
How to verify this for any arbitrary gpio ?