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