125 lines
3.6 KiB
Bash
Executable File
125 lines
3.6 KiB
Bash
Executable File
#!/bin/sh
|
|
|
|
# General constants declaration
|
|
THRESHOLD_PERCENT_LOW_BAT=5
|
|
THRESHOLD_PERCENT_EXTREMELY_LOW_BAT=2
|
|
MAX_EXTREMELY_LOW_BAT_BEFORE_SHUTDOWN=5
|
|
SLEEP_SECS=2
|
|
RESCALE_MAX_PERCENTAGE=120
|
|
|
|
# Blink Low bat constants declaration
|
|
BLINK_ICON=0
|
|
LOW_BAT_SECS_DISPLAYED=5
|
|
LOW_BAT_SECS_NOT_DISPLAYED=5
|
|
|
|
# Files and commands declaration
|
|
USB_PRESENT_FILE=/sys/class/power_supply/axp20x-usb/present
|
|
|
|
# Cheat for no USB present simulation when debugging
|
|
#USB_PRESENT_FILE=/sys/class/power_supply/axp20x-ac/present
|
|
BAT_PRESENT_FILE=/sys/class/power_supply/axp20x-battery/present
|
|
BAT_PERCENT_FILE=/sys/class/power_supply/axp20x-battery/capacity
|
|
BAT_PERCENT_RESCALED_FILE=/tmp/current_battery_percentage
|
|
LOW_BAT_ICON=/sys/class/graphics/fb0/low_battery
|
|
|
|
# Variables declaration
|
|
low_bat_status=0
|
|
low_bat_displayed=0
|
|
cur_secs_disp=0
|
|
cur_nb_extremely_low_bat_before_shutdown=0
|
|
|
|
# Default: Hide Low Bat Icon
|
|
echo 0 > ${LOW_BAT_ICON}
|
|
|
|
# Check low bat #
|
|
while true; do
|
|
#echo "Bat present: $(cat ${BAT_PRESENT_FILE})"
|
|
#echo "USB present: $(cat ${USB_PRESENT_FILE})"
|
|
#echo "Bat percentage: $(cat ${BAT_PERCENT_FILE})"
|
|
|
|
# Get current bat percentage here once
|
|
cur_bat_percent=$(cat ${BAT_PERCENT_FILE})
|
|
#echo "cur_bat_percent = ${cur_bat_percent}"
|
|
|
|
# Rescale bat percentage between 0 and RESCALE_MAX_PERCENTAGE
|
|
bat_percent_rescaled=$(printf "%.f" $(echo $cur_bat_percent $RESCALE_MAX_PERCENTAGE | awk '{print $1*$2/100}'))
|
|
#echo "bat_percent_rescaled = ${bat_percent_rescaled}"
|
|
|
|
# Re-maximize to 100%
|
|
bat_percent_rescaled_maxed=$(( bat_percent_rescaled < 100 ? bat_percent_rescaled : 100 ))
|
|
#echo "bat_percent_rescaled_maxed = ${bat_percent_rescaled_maxed}"
|
|
|
|
# Save in file
|
|
echo ${bat_percent_rescaled_maxed} > ${BAT_PERCENT_RESCALED_FILE}
|
|
|
|
# Low bat status detection
|
|
if [ "$(cat ${USB_PRESENT_FILE})" -eq "0" ]; then
|
|
|
|
# Value of 0 means wrong i2c reading
|
|
if [ "${cur_bat_percent}" -ne "0" ]; then
|
|
|
|
# Check if we must change state
|
|
if [ ${cur_bat_percent} -le ${THRESHOLD_PERCENT_LOW_BAT} -a ${low_bat_status} -eq 0 ]; then
|
|
|
|
# Set Low Bat status
|
|
low_bat_status=1
|
|
low_bat_displayed=1
|
|
cur_secs_disp=0
|
|
echo 1 > ${LOW_BAT_ICON}
|
|
|
|
elif [ ${cur_bat_percent} -gt ${THRESHOLD_PERCENT_LOW_BAT} -a ${low_bat_status} -eq 1 ]; then
|
|
|
|
# Reset status
|
|
low_bat_status=0
|
|
cur_nb_extremely_low_bat_before_shutdown=0
|
|
echo 0 > ${LOW_BAT_ICON}
|
|
fi
|
|
fi
|
|
else
|
|
if [ ${low_bat_status} -eq 1 ]; then
|
|
|
|
# Reset status
|
|
low_bat_status=0
|
|
cur_nb_extremely_low_bat_before_shutdown=0
|
|
echo 0 > ${LOW_BAT_ICON}
|
|
fi
|
|
fi
|
|
|
|
# Low bat processing
|
|
if [ ${low_bat_status} -eq 1 ]; then
|
|
|
|
# Check extremely low bat for clean shutdown
|
|
if [ ${cur_bat_percent} -le ${THRESHOLD_PERCENT_EXTREMELY_LOW_BAT} ]; then
|
|
let cur_nb_extremely_low_bat_before_shutdown++
|
|
echo "cur_nb_extremely_low_bat_before_shutdown = ${cur_nb_extremely_low_bat_before_shutdown}"
|
|
|
|
# Clean shutdown
|
|
if [ ${cur_nb_extremely_low_bat_before_shutdown} -ge ${MAX_EXTREMELY_LOW_BAT_BEFORE_SHUTDOWN} ]; then
|
|
echo "Battery extremely low, shutting down now..."
|
|
sched_shutdown 1 & signal_usr1_to_emulators
|
|
exit 0
|
|
fi
|
|
fi
|
|
|
|
# Blinking process
|
|
if [ ${BLINK_ICON} -eq 1 ]; then
|
|
if [ ${low_bat_displayed} -eq 1 -a ${cur_secs_disp} -ge ${LOW_BAT_SECS_DISPLAYED} ]; then
|
|
low_bat_displayed=0
|
|
cur_secs_disp=0
|
|
echo 0 > ${LOW_BAT_ICON}
|
|
elif [ ${low_bat_displayed} -eq 0 -a ${cur_secs_disp} -ge ${LOW_BAT_SECS_NOT_DISPLAYED} ]; then
|
|
low_bat_displayed=1
|
|
cur_secs_disp=0
|
|
echo 1 > ${LOW_BAT_ICON}
|
|
fi
|
|
fi
|
|
fi
|
|
|
|
# Sleep before next check
|
|
sleep ${SLEEP_SECS}
|
|
|
|
# Increase vars
|
|
let cur_secs_disp+=${SLEEP_SECS}
|
|
done
|
|
exit 0
|