From cf4e471ad0c7baba506c66d93a3adff08e3a9bab Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jakob@yoga.kaivo.net>
Date: Sat, 5 Dec 2015 01:16:06 -0500
Subject: initial commit

---
 README.md     |  3 +++
 autorotate.sh | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)
 create mode 100644 README.md
 create mode 100755 autorotate.sh

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8ca9562
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+This is a simple shell script that monitors the Linux IIO acceleromter for
+device rotation, then rotates the screen and touch inputs accordingly. It was
+developed and tested on a ThinkPad Yoga 12 (2nd generation).
diff --git a/autorotate.sh b/autorotate.sh
new file mode 100755
index 0000000..bf69b73
--- /dev/null
+++ b/autorotate.sh
@@ -0,0 +1,66 @@
+#!/bin/sh
+
+### TODO: These should be automatically identified
+touchpad='PS/2 Synaptics TouchPad'
+touchdev='SYNAPTICS Synaptics Touch Digitizer V04'
+
+# Global variables
+CURRENT='normal'
+GRAV=$(echo 7.0 / $(head -n1 /sys/bus/iio/devices/iio:device*/in_accel_scale) | bc)
+
+rotatetouch() {
+	# For some reason, xrandr causes the touch device to disappear briefly.
+	# This loop waits for it to come back.
+	while ! xinput --list | grep -q "$touchdev"; do :; done
+	xinput set-float-prop "$touchdev" 'Coordinate Transformation Matrix' $*
+}
+
+rotatewacom() {
+	### FIXME: the byte range (38-40) will probably break at some point
+	for dev in $(xsetwacom --list devices | cut -b 38-40); do
+		xsetwacom set "$dev" rotate $1
+	done
+}
+
+check_orientation() {
+	XRAW=$(head -n1 /sys/bus/iio/devices/iio:device*/in_accel_x_raw)
+	YRAW=$(head -n1 /sys/bus/iio/devices/iio:device*/in_accel_y_raw)
+
+	if [ $CURRENT != 'normal' ] && [ $YRAW -le -$GRAV ]; then
+		CURRENT='normal'
+		xrandr -o normal
+		rotatetouch 1 0 0 0 1 0 0 0 1
+		rotatewacom none
+		### FIXME: There should be a separate script to enable/disable touchpad on folding events
+		xinput enable "$touchpad"
+	fi
+
+	if [ $CURRENT != 'inverse' ] && [ $YRAW -ge $GRAV ]; then
+		CURRENT='inverse'
+		xrandr -o inverted
+		rotatetouch -1 0 1 0 -1 1 0 0 1
+		rotatewacom half
+		xinput disable "$touchpad"
+	fi
+
+	if [ $CURRENT != 'left' ] && [ $XRAW -ge $GRAV ]; then
+		CURRENT='left'
+		xrandr -o left
+		rotatetouch 0 -1 1 1 0 0 0 0 1
+		rotatewacom ccw
+		xinput disable "$touchpad"
+	fi
+
+	if [ $CURRENT != 'right' ] && [ $XRAW -le -$GRAV ]; then
+		CURRENT='right'
+		xrandr -o right
+		rotatetouch 0 1 0 -1 0 1 0 0 1
+		rotatewacom cw
+		xinput disable "$touchpad"
+	fi
+}
+
+while true; do
+	check_orientation
+	sleep 1
+done
-- 
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