From 2c13a3261a7c17ffa4d3ce08167c07be25ca17f1 Mon Sep 17 00:00:00 2001
From: John Klug <john.klug@multitech.com>
Date: Mon, 15 Feb 2021 16:02:33 -0600
Subject: Wait for supercap charge up to 3 minutes.  Poweroff if no power

---
 recipes-bsp/multitech/mts-io.inc               |  2 +-
 recipes-bsp/multitech/mts-io/mts-io.conf       | 10 +++++++
 recipes-bsp/multitech/mts-io/mts-io.mtcap.init | 38 ++++++++++++++++++++++++++
 3 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/recipes-bsp/multitech/mts-io.inc b/recipes-bsp/multitech/mts-io.inc
index e33ae00..65cb00c 100644
--- a/recipes-bsp/multitech/mts-io.inc
+++ b/recipes-bsp/multitech/mts-io.inc
@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://io-module/COPYING;md5=94d55d512a9ba36caa9b7df079bae19
                     file://io-tool/COPYING;md5=94d55d512a9ba36caa9b7df079bae19f \
 "
 do_fetch[depends] += "virtual/kernel:do_shared_workdir"
-INC_PR = "r3"
+INC_PR = "r4"
 
 SRCREV = "${PV}"
 PR = "${INC_PR}.0-${KERNEL_MODULE_PACKAGE_SUFFIX}"
diff --git a/recipes-bsp/multitech/mts-io/mts-io.conf b/recipes-bsp/multitech/mts-io/mts-io.conf
index b5b4275..4ed5e31 100644
--- a/recipes-bsp/multitech/mts-io/mts-io.conf
+++ b/recipes-bsp/multitech/mts-io/mts-io.conf
@@ -7,3 +7,13 @@ GPSGNSSRESET=1
 # 0 is off
 # 1 is on
 DEBUG=0
+
+# Supercap Feature
+# Do not let boot proceed until supercap is full.
+# Prevents loss of data when power is out.
+SUPERCAPFULL=1
+
+# Maximum wait time for SUPERCAPFULL
+#
+SUPERCAPFULL_MAXWAIT=180
+
diff --git a/recipes-bsp/multitech/mts-io/mts-io.mtcap.init b/recipes-bsp/multitech/mts-io/mts-io.mtcap.init
index 19bfa4a..ff0e947 100644
--- a/recipes-bsp/multitech/mts-io/mts-io.mtcap.init
+++ b/recipes-bsp/multitech/mts-io/mts-io.mtcap.init
@@ -103,6 +103,42 @@ cell_init() {
 start_lora_led_updater() {
   lora-led-updater &
 }
+gettime() {
+  [[ $(cat /proc/uptime) =~ ([^[:space:]]+) ]]
+  echo ${BASH_REMATCH[1]}
+}
+wait_for_supercap() {
+  supercap=$(mts-io-sysfs show capability/supercap 2>/dev/null)
+  if ((supercap != 1)) ; then
+      return
+  fi
+  if ((SUPERCAPFULL != 1)) ; then
+     break
+  fi
+  t0=$(gettime)
+  maxwait=$(awk "BEGIN {print ${t0}+${SUPERCAPFULL_MAXWAIT}}")
+  while : ; do
+    if (($(mts-io-sysfs show power-fail) == 1)) ; then
+      # If we are booting, then go down.
+      # This will not work with systemd.
+      if [[ $(ps -h -o cmd -p $PPID) =~ /bin/sh[[:space:]]/etc/init.d/rc[[:space:]]S$ ]] ; then
+          logger -s -t 'mts-io' -p daemon.err "No power during boot, so power off"
+          exec /sbin/poweroff
+          # NOT REACHED
+      fi
+    fi
+    if (($(mts-io-sysfs show supercap-full) == 1)) ; then
+      logger -s -t 'mts-io' -p daemon.err 'Supercap Charged'
+      return
+    fi
+    t1=$(gettime)
+    if awk "BEGIN { if($t1<$maxwait)exit 1 }" ; then
+	break
+    fi
+    sleep 1
+  done
+  logger -s -t 'mts-io' -p daemon.err 'Supercap not full but timer expired -- continuing boot'
+}
 
 case $1 in
   start)
@@ -129,6 +165,8 @@ case $1 in
     (($WIFICAP)) && modprobe wilc1000-sdio
     set_hw_name
     set_gpslink
+    wait_for_supercap
+
     ;;
 
   stop)
-- 
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