106 lines
1.4 KiB
Bash
Executable File
106 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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# brightne.sh
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# changes my backlight brightness, for use with nvidiabl
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# possibly the ugliest bash script ever
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# Requires /sys/class/backlight/nvidia_backlight/
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E_NOARGS=75
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backlight_path=/sys/class/backlight/nvidia_backlight
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usage() {
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echo "Usage: brightne.sh [set|fix|up|down] arg between 0 and 1024"
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}
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get_raw_maximum() {
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return `cat $backlight_path/max_brightness`
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}
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get_raw_current() {
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return `cat $backlight_path/brightness`
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}
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set_raw() {
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echo $1 > $backlight_path/brightness
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}
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# from 0-1024 to 0-max
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scale_to_bl() {
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get_raw_maximum
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max=$?
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scale_from_to $1 $max
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}
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scale_from_to() {
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echo "$2 * $1 / 1024" | bc
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}
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# from 0-max to 0-1024
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scale_from_bl() {
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get_raw_maximum
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max=$?
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echo "1024 * $1 / $max" | bc
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}
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off() {
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set_raw 0;
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}
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max() {
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get_raw_maximum
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raw_current=$?
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set_raw $raw_current
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}
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set_bl() {
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set_raw $(scale_to_bl $1)
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}
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get() {
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get_raw_current
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echo $(scale_from_bl $?)
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}
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fix() {
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get_raw_current
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set_raw $?
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}
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up() {
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local addvalue=$1
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if [ -z $1 ]
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then
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addvalue=10
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fi
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set_bl $(echo "$(get) + $addvalue" | bc)
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}
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down() {
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local addvalue=$1
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if [ -z $1 ]
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then
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addvalue=10
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fi
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set_bl $(echo "$(get) - $addvalue" | bc)
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}
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if [ -z "$1" ]
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then
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usage
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exit $E_NOARGS
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fi
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case $1 in
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"up" ) up $2;;
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"set" ) set_bl $2;;
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"down" ) down $2;;
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"fix" ) fix;;
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"get" ) get;;
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"off" ) off ;;
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"max" ) max ;;
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* ) usage;;
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esac
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exit 0 |