Initial commit: CB-C6s-STU GSI Fixes

TWRP flashable zip for CB-C6s-STU tablet running GSI.
- build.prop: append tablet characteristics, brightness, orientation, BT offload
- goodix_ts.idc: touchscreen IDC config
- sensor_config.xml: camera sensor module mapping (hi846 / gc8034)
- Shell-script update-binary with append-only build.prop logic

META-INF/com/google/android/update-binary

@@ -0,0 +1,123 @@
+#!/sbin/sh
+
+# ============================================================
+# TWRP Flashable Zip — CB-C6s-STU-GSI-Fixes
+#
+# This is a shell-script update-binary. TWRP extracts the zip,
+# sets the working dir to that temp location, and runs this script.
+# The updater-script is a dummy — all logic lives here.
+#
+# What it does:
+#   - Appends build.prop entries to /system/build.prop (not replace!)
+#   - Installs goodix_ts.idc to /system/usr/idc/
+#   - Installs sensor_config.xml to /vendor/etc/
+# ============================================================
+
+OUTFD=$2
+ZIPFILE=$3
+
+# ----- helpers -----
+ui_print() {
+  echo -n -e "ui_print $1\n" > /proc/self/fd/$OUTFD
+  echo -n -e "ui_print\n" > /proc/self/fd/$OUTFD
+}
+
+abort() {
+  ui_print " "
+  ui_print "ERROR: $1"
+  ui_print "Installation aborted."
+  exit 1
+}
+
+# ----- locate zip root -----
+# The script lives at:  META-INF/com/google/android/update-binary
+# Zip root is 3 levels up from the script's directory.
+SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
+ZIPROOT=$(cd "$SCRIPT_DIR/../../.." && pwd)
+
+ui_print "========================================"
+ui_print "  CB-C6s-STU-GSI-Fixes"
+ui_print "  Tablet GSI tweaks"
+ui_print "========================================"
+
+# ----- mount partitions -----
+ui_print " "
+ui_print "Mounting partitions..."
+
+mount /system 2>/dev/null
+mount /vendor 2>/dev/null
+
+# Verify /system is accessible
+if [ ! -d /system ] || [ ! -f /system/build.prop ]; then
+  abort "Cannot access /system. Is the system partition mounted?"
+fi
+
+ui_print "Partitions ready."
+
+# ----- 1. APPEND build.prop (关键：追加，不覆盖) -----
+ui_print " "
+ui_print "[1/3] Appending entries to /system/build.prop..."
+
+BUILDPROP_SRC="$ZIPROOT/system/build.prop"
+
+if [ ! -f "$BUILDPROP_SRC" ]; then
+  abort "build.prop not found inside zip."
+fi
+
+# Backup original before modifying
+cp /system/build.prop /system/build.prop.bak 2>/dev/null
+chmod 644 /system/build.prop.bak 2>/dev/null
+
+# APPEND — 使用 >> 追加而非覆盖
+cat "$BUILDPROP_SRC" >> /system/build.prop
+chmod 644 /system/build.prop
+
+ui_print "build.prop: entries appended. Backup at build.prop.bak"
+
+# ----- 2. Install touchscreen IDC -----
+ui_print " "
+ui_print "[2/3] Installing goodix_ts.idc..."
+
+IDC_SRC="$ZIPROOT/system/usr/idc/goodix_ts.idc"
+IDC_DST="/system/usr/idc/goodix_ts.idc"
+
+if [ -f "$IDC_SRC" ]; then
+  mkdir -p /system/usr/idc 2>/dev/null
+  cp -f "$IDC_SRC" "$IDC_DST"
+  chmod 644 "$IDC_DST"
+  ui_print "goodix_ts.idc installed."
+else
+  ui_print "goodix_ts.idc not found — skipped."
+fi
+
+# ----- 3. Install sensor config -----
+ui_print " "
+ui_print "[3/3] Installing sensor_config.xml..."
+
+SENSOR_SRC="$ZIPROOT/vendor/etc/sensor_config.xml"
+
+if [ -f "$SENSOR_SRC" ]; then
+  # /vendor may be a separate partition OR a symlink under /system
+  if [ -d /vendor/etc ]; then
+    cp -f "$SENSOR_SRC" /vendor/etc/sensor_config.xml
+    chmod 644 /vendor/etc/sensor_config.xml
+    ui_print "sensor_config.xml → /vendor/etc/"
+  elif [ -d /system/vendor/etc ]; then
+    cp -f "$SENSOR_SRC" /system/vendor/etc/sensor_config.xml
+    chmod 644 /system/vendor/etc/sensor_config.xml
+    ui_print "sensor_config.xml → /system/vendor/etc/"
+  else
+    ui_print "WARNING: /vendor/etc not found — skipped."
+  fi
+else
+  ui_print "sensor_config.xml not found — skipped."
+fi
+
+# ----- done -----
+ui_print " "
+ui_print "========================================"
+ui_print "  Installation complete!"
+ui_print "  Reboot to apply changes."
+ui_print "========================================"
+
+exit 0