Can't get power button to work
#13
(08-28-2016, 03:12 AM)MarkHaysHarris777 Wrote: hi, yeah, the power|suspend button and the reset button attach directly to the PMIC (power management integrated circuit).  See the schematic diagram here (although its a bit out-of-date).

... I have not tried to see the event from evtest !?!  ... also I have tested in both debian and ubuntu, holding the power on button for two seconds will cause the PMIC to signal the GPU ( OS ) to pull up the power off dialogue.

edit:  ok... the trick to see the event ( power on ) in evtest, is to select the axp81x option (1).

... the event comes up nicely, code 116 ( key_power ).

( this I tested with evtest on ubuntu mate )

So, if you want to build your own monitor, you need to first tell the OS not to respond to 116, key_power,  then map that key for your own purposes.

(08-28-2016, 04:07 AM)pfeerick Wrote: As Mark indicated, it does work... the trick is to to select the right device. 

You can see in the code box below the output from running evtest on a ubuntu box, and selecting axp81x-supplyer, which was device event number 1 in that case. Credit goes to xalius for posting it in that thread I linked earlier about the power button. The button was pressed twice, so you can see a 1 when it was pressed, and a 0 when it is released. 

Code:
ubuntu@pine64:~$ sudo evtest

No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:      sunxi-keyboard
/dev/input/event1:      axp81x-supplyer
/dev/input/event2:      sunxi-ths
/dev/input/event3:      audiocodec sunxi Audio Jack
/dev/input/event4:      sunxi_ir_recv
/dev/input/event5:      MCE IR Keyboard/Mouse (sunxi-rc-recv)

Select the device event number [0-5]: 1

Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100
Input device name: "axp81x-supplyer"
Supported events:
 Event type 0 (EV_SYN)
 Event type 1 (EV_KEY)
   Event code 116 (KEY_POWER)
 Event type 2 (EV_REL)
Properties:
Testing ... (interrupt to exit)
Event: time 1466799328.888825, type 1 (EV_KEY), code 116 (KEY_POWER), value 1
Event: time 1466799328.888825, -------------- SYN_REPORT ------------
Event: time 1466799328.999256, type 1 (EV_KEY), code 116 (KEY_POWER), value 0
Event: time 1466799328.999256, -------------- SYN_REPORT ------------
Event: time 1466799329.630542, type 1 (EV_KEY), code 116 (KEY_POWER), value 1
Event: time 1466799329.630542, -------------- SYN_REPORT ------------
Event: time 1466799329.798206, type 1 (EV_KEY), code 116 (KEY_POWER), value 0
Event: time 1466799329.798206, -------------- SYN_REPORT ------------

I am definitely using the apx81x-supplyer device to test and still not getting any output.  I followed the example from the xalius link that pfeerick posted. Not sure what's wrong.


Messages In This Thread
Can't get power button to work - by AidenH - 08-27-2016, 08:46 PM
RE: Can't get power button to work - by pfeerick - 08-27-2016, 09:11 PM
RE: Can't get power button to work - by pfeerick - 08-27-2016, 10:58 PM
RE: Can't get power button to work - by pfeerick - 08-28-2016, 01:08 AM
RE: Can't get power button to work - by AidenH - 08-27-2016, 11:38 PM
RE: Can't get power button to work - by AidenH - 08-28-2016, 02:45 AM
RE: Can't get power button to work - by pfeerick - 08-28-2016, 04:07 AM
RE: Can't get power button to work - by AidenH - 08-28-2016, 04:49 AM
RE: Can't get power button to work - by AidenH - 08-28-2016, 05:10 AM
RE: Can't get power button to work - by DonFL - 08-28-2016, 05:13 AM
RE: Can't get power button to work - by DonFL - 08-28-2016, 07:19 AM

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