MTX-4590 MTCDT3AC: Probe I2C GPIO to load device tree overlay on SD manufacturing image

1 files changed, 69 insertions, 0 deletions

diff --git a/recipes-bsp/multitech/mt-dt-overlay/init-mtcpmhs-sdmfg b/recipes-bsp/multitech/mt-dt-overlay/init-mtcpmhs-sdmfg
new file mode 100644
index 0000000..2a0e03d
--- /dev/null
+++ b/recipes-bsp/multitech/mt-dt-overlay/init-mtcpmhs-sdmfg
@@ -0,0 +1,69 @@
+#!/bin/bash
+# This script must be run only to set up device tree on new devices
+# as part of manufacturing process when EEPROMs are empty
+
+
+DEVTREE="/sys/kernel/config/device-tree/overlays/"
+
+install_all_dtbo() {
+  for f in *.dtbo ; do
+    if ! [[ -f $f ]] ; then
+        continue
+    fi
+    # f2 is the extracted device name
+    base=$(basename $f .dtbo)
+    /bin/mkdir ${DEVTREE}/$base || true
+    /bin/cat $f >${DEVTREE}/$base/dtbo
+  done
+}
+
+load_overlay() {
+  if ! pushd /lib/dtoverlays ; then
+    echo "Can't find device tree overlays"
+    return 1
+  fi
+  
+  # Detect PCA9557 I2C GPIO at 0x19 on I2C bus 1
+  RES_="$(/usr/sbin/i2cdetect -r -y 1 0x19 0x19)"
+  if [[ "$RES_" =~ .*(^10:[[:blank:]]+19).* ]]; then
+    if ! pushd MTCDT3/0.2 ; then
+      echo "Can't find MTCDT3/0.2 direcotry"
+      popd
+      return 1
+    fi
+    echo "Loading device tree overlay for MTCDT3 v 0.2"
+    install_all_dtbo
+    popd
+  fi
+
+  # Detect MCP23008 I2C GPIO at 0x21 on I2C bus 1
+  RES_="$(/usr/sbin/i2cdetect -r -y 1 0x21 0x21)"
+  if [[ "$RES_" =~ .*(^20:[[:blank:]]+21).* ]]; then
+    if ! pushd MTCDT3/0.0 ; then
+      echo "Can't find MTCDT3/0.0 direcotry"
+      popd
+      return 1
+    fi
+    echo "Loading device tree overlay for MTCDT3 v 0.0"
+    install_all_dtbo
+    popd
+  fi
+
+  popd
+}
+
+case $1 in
+  start)
+    echo "Loading device tree overlay"
+    load_overlay
+    ;;
+
+  stop)
+    echo "Not implemented"
+    ;;
+
+  *)
+    echo "Usage: $0 {start|stop}"
+    exit 2
+    ;;
+esac