Initial import

1 files changed, 113 insertions, 0 deletions

diff --git a/PKGBUILD b/PKGBUILD
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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"
+}