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# Author: Stefan Majewsky <majewsky at-the-server gmx with-the-tld net>
pkgname=asus-kbd-backlight
pkgver=1.1
pkgrel=1
pkgdesc="Helper for adjusting keyboard backlight brightness in Asus Zenbook UX31A and similar models"
url="https://wiki.archlinux.org/index.php/ASUS_Zenbook_Prime_UX31A#keyboard_backlight_script"
arch=('any')
license=(FDL1.3)
depends=('bash')
optdepends=('systemd: automatically grant user access to keyboard backlight control')
install="asus-kbd-backlight.install"
# general note: this package contains only two files; I don't see any added
# value in stuffing these into a tarball when I can also place them in here
# using heredocs (cf. http://stackoverflow.com/a/2954835/334761 for reference)
build() {
mkdir -p $srcdir/$pkgname-$pkgver/
cd $srcdir/$pkgname-$pkgver/
# write the backlight helper script
cat <<-'EOF' > ./asus-kbd-backlight
#!/bin/bash
path="/sys/class/leds/asus::kbd_backlight"
if [ ! -e "$path" ]; then
path="/sys/devices/platform/asus-nb-wmi/leds/asus::kbd_backlight"
fi
# max should be 3
max=$(cat ${path}/max_brightness)
# step: represent the difference between previous and next brightness
step=1
previous=$(cat ${path}/brightness)
function commit {
if [[ $1 = [0-9]* ]]
then
if [[ $1 -gt $max ]]
then
next=$max
elif [[ $1 -lt 0 ]]
then
next=0
else
next=$1
fi
echo $next >> ${path}/brightness
exit 0
else
exit 1
fi
}
case "$1" in
up)
commit $(($previous + $step))
;;
down)
commit $(($previous - $step))
;;
max)
commit $max
;;
on)
$0 max
;;
off)
commit 0
;;
show)
echo $previous
;;
night)
commit 1
;;
allowusers)
# Allow members of users group to change brightness
sudo chgrp users ${path}/brightness
sudo chmod g+w ${path}/brightness
;;
disallowusers)
# Allow members of users group to change brightness
sudo chgrp root ${path}/brightness
sudo chmod g-w ${path}/brightness
;;
*)
commit $1
esac
exit 0
EOF
# write the systemd unit file
cat <<-'EOF' > ./asus-kbd-backlight.service
[Unit]
Description=Allow user access to keyboard backlight
After=systemd-udevd.service
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/usr/bin/asus-kbd-backlight allowusers
ExecStop=/usr/bin/asus-kbd-backlight disallowusers
[Install]
WantedBy=multi-user.target
EOF
}
package() {
cd $srcdir/$pkgname-$pkgver/
install -D -m 0755 asus-kbd-backlight "$pkgdir/usr/bin/asus-kbd-backlight"
install -D -m 0644 asus-kbd-backlight.service "$pkgdir/usr/lib/systemd/system/asus-kbd-backlight.service"
}
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