jolla usb power states

# Charge battery, and use usb power to power phone
chmod u+w /sys/class/power_supply/usb/charger_disable
echo 0 > /sys/module/pm8921_charger/parameters/disabled
echo 0 > /sys/class/power_supply/usb/charger_disable

# don't charge battery, but use usb power to power phone
chmod u+w /sys/class/power_supply/usb/charger_disable
echo 1 > /sys/module/pm8921_charger/parameters/disabled
echo 0 > /sys/class/power_supply/usb/charger_disable

# don't charge battery, and don't use usb power to power phone (as if cable disconnected)
chmod u+w /sys/class/power_supply/usb/charger_disable
echo 1 > /sys/module/pm8921_charger/parameters/disabled
echo 1 > /sys/class/power_supply/usb/charger_disable