ublox-gsm-config: Create a daemon to keep control of gpios

recipes-connectivity/ublox-gsm-config/files/ublox-gsm-config.py

@@ -6,6 +6,7 @@ import time
 import os
 import configparser
 import gpiod
+import signal
 config_dump = __import__("modem-config-dump")
 
 SERIAL_DEV = '/dev/ttyACM0'
@@ -13,6 +14,9 @@ WWAN_DEV = '/sys/class/net/wwan0'
 SIM_CONFIG = '/etc/sim.conf'
 APN_CONFIG = '/etc/apn.conf'
 
+sim_sw = gpiod.find_line('SIM_SW')
+gsm_pwr_en = gpiod.find_line('GSM_SUP_EN')
+
 def execute_and_check(ser, cmd):
     tries = 0
     MAX_TRY = 5
@@ -32,14 +36,10 @@ def execute_and_check(ser, cmd):
         tries = 0
 
 def init_sim_sw():
-    line = gpiod.find_line('SIM_SW')
-    line.request(consumer='ublox-config', type=gpiod.LINE_REQ_DIR_OUT)
-    line.set_value(1)
+    sim_sw.request(consumer='ublox-config', type=gpiod.LINE_REQ_DIR_OUT, default_vals=[ 1 ])
 
 def switch_sim():
-    line = gpiod.find_line('SIM_SW')
-    line.request(consumer='ublox-config', type=gpiod.LINE_REQ_DIR_OUT)
-    line.set_value(0)
+    sim_sw.set_value(0)
 
 def sim_present(ser):
     cmd = b'AT+CCID?'
@@ -138,11 +138,11 @@ def factory_reset():
     execute_and_check(ser, b'AT+UFACTORY=2,1')
     reset_modem(ser)
 
-def poweroff(gpio):
+def poweroff():
     print('poweroff')
     if not os.path.exists(SERIAL_DEV):
         print('serial interface is not available')
-        gpio.set_value(0)
+        gsm_pwr_en.set_value(0)
         return -1
     ser = serial.Serial(SERIAL_DEV, 115200, timeout=0.5)
     ser.write(b'AT+CPWROFF\r')
@@ -150,15 +150,27 @@ def poweroff(gpio):
 
     time.sleep(7.5)
 
-    gpio.set_value(0)
+    gsm_pwr_en.set_value(0)
+
+def signal_handler(sig, frame):
+    poweroff()
+    sys.exit(0)
+
+def daemonize():
+    n = os.fork()
+    if n > 0:
+        f = open('/run/ublox-gsm-config.pid', 'w')
+        f.write(str(n))
+        return
+
+    signal.signal(signal.SIGTERM, signal_handler)
+    while True:
+        time.sleep(10)
 
 def help():
     print('Usage : {} [stop|factory-reset]'.format(sys.argv[0]))
 
 def main():
-    line = gpiod.find_line('GSM_SUP_EN')
-    line.request(consumer='ublox-config', type=gpiod.LINE_REQ_DIR_OUT)
-    init_sim_sw()
     if len(sys.argv) == 2:
         if sys.argv[1] == 'stop':
             return poweroff(line)
@@ -167,8 +179,9 @@ def main():
         else:
             return help()
 
-    # Power on
-    line.set_value(1)
+    # Power modem
+    init_sim_sw()
+    gsm_pwr_en.request(consumer='ublox-config', type=gpiod.LINE_REQ_DIR_OUT, default_vals= [ 1 ])
 
     # Wait on device
     while not os.path.exists(SERIAL_DEV):
@@ -195,6 +208,7 @@ def main():
     apn_setup(ser)
     config_dump.dump_modem_config(ser)
     ser.close()
+    daemonize()
 
 if __name__ == '__main__':
     main()

recipes-connectivity/ublox-gsm-config/files/ublox-gsm-config.service

@@ -3,11 +3,9 @@ Description=ublox GSM Modem configuration
 Before=ModemManager.service
 
 [Service]
-Type=oneshot
+Type=forking
 ExecStart=/usr/bin/ublox-gsm-config
-ExecStop=/usr/bin/ublox-gsm-config stop
-RemainAfterExit=yes
-TimeoutStopSec=20
+PIDFile=/run/ublox-gsm-config.pid
 
 [Install]
 RequiredBy=ModemManager.service