Wait for supercap charge up to 3 minutes. Poweroff if no power

2 files changed, 48 insertions, 0 deletions

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)