79 lines
1.6 KiB
Bash
Executable file
79 lines
1.6 KiB
Bash
Executable file
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0-or-later
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# Copyright (C) 2020-present Fewtarius
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BRIGHTNESS_DEV="$(ls /sys/class/backlight | head -n 1)"
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MIN=5
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MAX=$(cat /sys/class/backlight/${BRIGHTNESS_DEV}/max_brightness)
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if [ "${MAX}" = 255 ]
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then
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STEP=15
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else
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STEP=5
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fi
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if [[ -n "$2" ]]; then
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STEP=$2
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fi
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# Ensure set_setting exists in all contexts
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if ! type set_setting &>/dev/null
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then
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source /etc/profile
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fi
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if [ ! -f /sys/class/backlight/${BRIGHTNESS_DEV}/brightness ]
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then
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echo "ERROR: There is no BRIGHTNESS object to manage."
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exit 1
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fi
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round() {
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awk -v val=$1 'BEGIN{print int((val+5/2)/5) * 5}'
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}
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stepUp() {
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getBrightness
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MYBRIGHTNESS=$?
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NEWBRIGHTNESS=$((${MYBRIGHTNESS}+$(round ${STEP})))
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if (( ${NEWBRIGHTNESS} > ${MAX} ))
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then
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NEWBRIGHTNESS=${MAX}
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fi
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echo "${NEWBRIGHTNESS}" > /sys/class/backlight/${BRIGHTNESS_DEV}/brightness
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set_setting system.brightness ${NEWBRIGHTNESS}
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}
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stepDown() {
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getBrightness
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MYBRIGHTNESS=$?
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NEWBRIGHTNESS=$((${MYBRIGHTNESS}-$(round ${STEP})))
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if (( ${NEWBRIGHTNESS} < ${MIN} ))
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then
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NEWBRIGHTNESS=${MIN}
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fi
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echo "${NEWBRIGHTNESS}" > /sys/class/backlight/${BRIGHTNESS_DEV}/brightness
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set_setting system.brightness ${NEWBRIGHTNESS}
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}
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getBrightness() {
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local BRIGHTNESS=$(cat /sys/class/backlight/${BRIGHTNESS_DEV}/brightness)
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return ${BRIGHTNESS}
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}
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case ${1} in
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"up")
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stepUp ${BRIGHTNESS}
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;;
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"down")
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stepDown ${BRIGHTNESS}
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;;
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"device")
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echo ${BRIGHTNESS_DEV}
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;;
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*)
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getBrightness
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echo $?
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;;
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esac
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