6UL Express power mode control

Embedded Devices Linux
1

Dear colleagues,

I’m working with 6UL express module. There is possibility to manage system by pressing power key input which works perfectly as described in documentation here: https://www.digi.com/resources/documentation/digidocs/90002286/#reference/bsp/v4-9_6ul/r_mca_power_key_input_6ul.htm%3FTocPath%3DDigi%2520Embedded%2520Yocto|System%2520development|Linux%2520kernel|Linux%2520%2520v4.9%2520Board%2520Support%2520Package|Devices%2520and%2520interfaces|Micro%2520Controller%2520Assist%2520(MCA)|_____5

In my application I would like to get some notification when system goes to sleep (suspend) or wakes up. I couldn’t find any tools or events that provide such a notification.

Could you please advise what tools, programs can I use to get notified when systems goes to suspend mode or wakes up?

Thanks and best regards,
Gennady Zubkov

2

on cc6ul the mca/linux is currently:
o when a short press is done in the power button, it is calling mca_pwrkey_sleep_irq_handler() in drivers/input/misc/pwrkey-mca.c
The implementation that Digi does here signals the KEY_SLEEP press so the system goes to sleep.
o when a long press is done in the power button, it is calling mca_pwrkey_power_off_irq_handler() in drivers/input/misc/pwrkey-mca.c
The implementation that Digi does here signals the KEY_POWER press so the system goes to power-off.

So it looks like you should be able to implement some logic in mca_pwrkey_power_off_irq_handler() in drivers/input/misc/pwrkey-mca-cc6ul.c to do what you want
https://github.com/digi-embedded/linux/blob/v4.9/dey-2.6/maint/drivers/input/misc/pwrkey-mca-cc6ul.c

3

Hi Leonid,

thank you for your response. Could you please provide some more details, what should I do in order to fix this?

Is this correct that I have to rebuilt a new yocto image with new driver functionality as you mentioned? Is this possible at all to build this pwrkey-mca-cc6ul driver separately and load it afterwards?

Is there any possibility to obtain the information about KEY_SLEPP and KEY_POWER events from user space application?

Thanks, and best regards,
Gennady Zubkov