System stand-by when long pressing ONOFF button

keshavakumarb — Thu, 19 Apr 2018 07:46:02 GMT

Hi All,

Setup:

Platform: i.MX6UL EVK
BSP: Linux 4.1.15
Flashed Default i.MX6UL EVK Binaries to micro SD.

Background: On Power up the EVK boots successfully and we get Linux console. When I press the PWR button for more than 5 seconds, the system goes to power off state.The PWR button is connected to ONOFF pad of i.MX6UL processor. When I press again the PWR button the system boots and able to get the Linux console again.

One more Experiment: Using following command, able to put the system in stand-by mode successfully.

echo standby > /sys/power/state

And able to wake successfully using PWR Button

Requirement: On pressing PWR button for more than 5 seconds the system should go for standby mode. And

when PWR button is pressed again it should wake up

We would like to implement a feature, where system goes to Stand-by mode when this button is pressed.

Queries:

How can we achieve this?

Is there any option to read this ONOFF PAD.?
On pressing PWR button for 5 seconds, How can we change the functionality of the system to go to stand-by mode instead of system shutdown?

Any input about this would be a great help

Thanks in advance.
With Regards,
Keshava Kumar B

Re: System stand-by when long pressing ONOFF button

Yuri — Thu, 19 Apr 2018 08:35:48 GMT

Hello,

The following thread may be helpful:

i.MX6UL pwrkey: restart/wake-up behaviour

For wakeup button should be pressed longer than Off to On configuration.

For power off : press button longer than the Max Timeout. Both parameters are

programmed in LPCR register, bit fields ON_TIME and BTN_PRESS_TIME.

In ON state, a button press > 5 sec will initiate an immediate HW shutdown

(PMIC_ON_REQ will go low). Note that this feature will only work after initialization

software clears the Power Glitch bit. So, it is possible to disable HW shutdown

in software, via the Power Glitch bit (in SNVS_LP Control (LPCR)).

Have a great day,

Yuri

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topic Re: System stand-by when long pressing ONOFF button in i.MX Processors

System stand-by when long pressing ONOFF button

Re: System stand-by when long pressing ONOFF button