[question] How to prevent charging from USB on Jolla Tablet ?

The URL you show suggests to me, you're looking in the wrong place. I see no mention of USB in the URL/path.

This is a correct place on my tablet...
Also I found a way how to disable charging... If I run this command:

echo 0 > /sys/devices/platform/80860F41:04/i2c-5/5-0034/dollar_cove_charger/power_supply/dollar_cove_charger/present

it stop charging my tablet, but with big delay.. after something like 30-40sec... And now if you will check status:

cat /sys/devices/platform/80860F41:04/i2c-5/5-0034/dollar_cove_battery/power_supply/dollar_cove_battery/status

instead "Discharging", you will see "Not charging"...
Any other solutions ?

OK, by this 3 commands it work for me (when usb cable connected):

chmod 777 $(find /sys/devices/platform -type f -name present|grep power_supply|grep charger|grep -v alien)
echo 0 > $(find /sys/devices/platform -type f -name present|grep power_supply|grep charger|grep -v alien)
chmod 444 $(find /sys/devices/platform -type f -name present|grep power_supply|grep charger|grep -v alien)

to restore (when usb cable is still connected):

chmod 777 $(find /sys/devices/platform -type f -name present|grep power_supply|grep charger|grep -v alien)
echo 1 > $(find /sys/devices/platform -type f -name present|grep power_supply|grep charger|grep -v alien)
chmod 444 $(find /sys/devices/platform -type f -name present|grep power_supply|grep charger|grep -v alien)

but like I said it can take some time to see the result... something like between 30sec and 1min.
BEWARE - use it on your own risk...

Here's what I came up with (lol) for Jolla phone, after adding nemo to sudoers file and creating a .sh script to do the business;

> #!/bin/sh
> 
> TOGGLE=$HOME/.toggle
> 
> if [ ! -e $TOGGLE ] then touch $TOGGLE
>     sudo chmod 4777 /sys/class/power_supply/usb/charger_disable
>     echo 1 > /sys/class/power_supply/usb/charger_disable
> else rm $TOGGLE
>     sudo chmod 4777 /sys/class/power_supply/usb/charger_disable
>     echo 0 > /sys/class/power_supply/usb/charger_disable
> fi

Sometimes there is a delay in turning charging back on, but it's only a few seconds, not 30 or 40 secs. (I will learn how to format text here on TJC!)

@Markkyboy, I speak about Jolla Tablet, not the phone ;)