Implemented dependency check between ShutdownButton and StatusLed

* untested
* If a ShutdownButton and a StatusLed are both configured and use the same led pin, the status that the led should have in case a shutdown request (blinking shutdown led) is cancelled is set at the ShutdownButton

components/gpio_control/GPIODevices/shutdown_button.py

@@ -15,6 +15,7 @@ def __init__(self, pin, action=lambda *args: None, name=None, bouncetime=500, an
                  led_pin=None, hold_time=3.0, pull_up_down='pull_up', iteration_time=.2):
         self.led_pin = led_pin
         self.iteration_time = iteration_time
+        self.led_state_shutdown_cancelled = GPIO.LOW
         if self.led_pin is not None:
             GPIO.setup(self.led_pin, GPIO.OUT)
         super(ShutdownButton, self).__init__(pin=pin, action=action, name=name, bouncetime=bouncetime,

components/gpio_control/gpio_control.py

@@ -101,6 +101,18 @@ def get_all_devices(self, config):
                 self.logger.info('Device {} not enabled'.format(section))
         return self.devices
 
+    # Sets the led value at the shutdown button that should be used in case of the shutdown
+    # sequence is cancelled if StatusLED and ShutdownLED use the sampe GPIO
+    def checkDevicesDependencies(self):
+        for dev in self.devices:
+            if isinstance(dev, ShutdownButton):
+                shutdownButtonFound = dev
+            elif isinstance(dev, StatusLED):
+                statusLedFound = dev
+        if statusLedFound and shutdownButtonFound:
+            if statusLedFound.pin == shutdownButtonFound.led_pin:
+                shutdownButtonFound.led_state_shutdown_cancelled = GPIO.HIGH
+
     def print_all_devices(self):
         for dev in self.devices:
             print(dev)