CODEWITHSUNDEEP
linuxembedded-linuxinterruptgpio
iabdalkader
iabdalkader

Reputation: 17312

Enable GPIO wakeup in Embedded Linux

I'm trying to enable wakeup event for GPIO on embedded Linux, after searching for a while I figured how to do it, but when I try this:

echo enabled > /sys/class/gpio/gpio<n>/power/wakeup

I get

write error: Invalid argument

Does this mean that it's not supported by the hardware ? or do I need to enable something in the kernel ?

Edit:

Just for the record, sysfs GPIO is enabled and working fine, I can read/write the GPIO values, but I can't seem to be able to enable the wakeup event, I've been reading the kernel documentation and it says:

"Inputs can often be used as IRQ signals, often edge triggered but sometimes level triggered. Such IRQs may be configurable as system wakeup events, to wake the system from a low power state."

So I'm wondering, do I need to configure wakeup events for GPIO in the kernel ? and if the hardware doesn't support it, why do I have a wakeup file under sysfs/class/gpio/gpio#/power/wakeup ?

Upvotes: 1

Views: 5132

Answers (1)

A.G.
A.G.

Reputation: 1319

Make sure your GPIO driver, which might specific for your board, handles the wakeup feature.

Upvotes: 1

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