From b92b21b9548a5c7635e9cab6c15b872c5413d9cf Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Wed, 24 Jul 2019 02:36:14 +0200
Subject: [PATCH] enabled touch rotation, removed fixed screen rotation

---
 config.example             |  3 ---
 modules/display_ws5inch.mk | 35 ++++++++++++++++++++++-------------
 2 files changed, 22 insertions(+), 16 deletions(-)

diff --git a/config.example b/config.example
index 95d1485..07edc44 100644
--- a/config.example
+++ b/config.example
@@ -46,9 +46,6 @@
 ## In nodm, use full screen chromium web browser as session
 # webui=http://localhost/
 
-## Rotation for some Raspberry Displays
-# display_rotate=0
-
 ## When using NIS modules the directory server should be given
 # nis_server=nismaster
 
diff --git a/modules/display_ws5inch.mk b/modules/display_ws5inch.mk
index 7b3e941..6f03a5d 100644
--- a/modules/display_ws5inch.mk
+++ b/modules/display_ws5inch.mk
@@ -1,12 +1,4 @@
-ifndef display_rotate
-  display_rotate := 0
-endif
-
-ifeq "${display_rotate}" "0"
-  display_touch_calibration := 200 3950 250 4000
-else ifeq "${display_rotate}" "2"
-  display_touch_calibration := 3950 200 4000 250
-endif
+PACKAGES += xserver-xorg-input-evdev xinput xinput-calibrator
 
 define RPICONFIG +=
 
@@ -16,30 +8,47 @@ hdmi_mode=87
 hdmi_cvt=800 480 60 6 0 0 0
 hdmi_drive=1
 dtoverlay=ads7846,cs=1,penirq=25,penirq_pull=2,speed=50000,keep_vref_on=0,swapxy=0,pmax=255,xohms=150,xmin=200,xmax=3900,ymin=200,ymax=3900
-display_rotate=${display_rotate}
 endef
 
+export display_ws5inch_cfg display_ws5inch_rotation
+
 define display_ws5inch_cfg :=
 Section "InputClass"
 	Identifier "evdev touchscreen catchall"
 	MatchIsTouchscreen "on"
-	Option  "Calibration"   "${display_touch_calibration}"
+	Option  "Calibration"   "200 3950 250 4000"
 	MatchDevicePath "/dev/input/event*"
 	Driver "evdev"
 EndSection
 endef
 
-export display_ws5inch_cfg
+define display_ws5inch_rotation :=
+# Keep touch matrix rotated in accordance with screen rotation
+while sleep 3; do
+  oldrotate="$${rotate}"
+  rotate="$$(xrandr |grep primary)"
+  rotate="$${rotate#*+0+0 }"
+  rotate="$${rotate% (*}"
 
-PACKAGES += xserver-xorg-input-evdev xinput xinput-calibrator
+  [ "$${oldrotate}" = "$${rotate}" ] || case $$rotate in
+    left)     xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' 0 -1 1  1 0 0  0 0 1;;
+    right)    xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' 0 1 0  -1 0 1  0 0 1;;
+    inverted) xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' -1 0 1  0 -1 1  0 0 1;;
+    *)        xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' 1 0 0  0 1 0  0 0 1;;
+  esac
+done &
+endef
 
 .PHONY: _display_ws5inch
 _config: _display_ws5inch
 _display_ws5inch: ${CFGROOT} _copy _mount
+	# Rough touch calibration
 	mkdir -p "$${CFGROOT}/usr/share/X11/xorg.conf.d/"
 	printf '%s\n' "$${display_ws5inch_cfg}" >"$${CFGROOT}/usr/share/X11/xorg.conf.d/45-evdev.conf"
+	# Resolution / Rotation stuff
 	mkdir -p "$${CFGROOT}/etc/X11/Xsession.d/"
 	printf 'xrandr --size 800x480\n' >"$${CFGROOT}/etc/X11/Xsession.d/10display_resolution"
+	printf '%s\n' "$$display_ws5inch_rotation" >"$${CFGROOT}/etc/X11/Xsession.d/20touch_rotation"
 	# Correct DPI scaling, although application support is mediocre
 	mkdir -p "$${CFGROOT}/etc/X11/Xresources/"
 	printf 'Xft.dpi: 180\n' >"$${CFGROOT}/etc/X11/Xresources/dpi_resolution"
-- 
2.39.2