Add gc100 platforms and component (#10159)

* Initial commit of gc100 platforms and component

* Fixed removed temporary code to set import path

* Fixed removed unused import

* Implementing changes requested by @fabaff

* Fixed linter errors

* Remove reference to binary sensor

* Move const

* Add const

* Fix pylint

homeassistant/components/binary_sensor/gc100.py

@@ -0,0 +1,69 @@
+"""
+Support for binary sensor using GC100.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/binary_sensor.gc100/
+"""
+import voluptuous as vol
+
+from homeassistant.components.gc100 import DATA_GC100, CONF_PORTS
+from homeassistant.components.binary_sensor import (
+    BinarySensorDevice, PLATFORM_SCHEMA)
+from homeassistant.const import DEVICE_DEFAULT_NAME
+import homeassistant.helpers.config_validation as cv
+
+DEPENDENCIES = ['gc100']
+
+_SENSORS_SCHEMA = vol.Schema({
+    cv.string: cv.string,
+})
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_PORTS): vol.All(cv.ensure_list, [_SENSORS_SCHEMA])
+})
+
+
+# pylint: disable=unused-argument
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Set up the GC100 devices."""
+    binary_sensors = []
+    ports = config.get(CONF_PORTS)
+    for port in ports:
+        for port_addr, port_name in port.items():
+            binary_sensors.append(GC100BinarySensor(
+                port_name, port_addr, hass.data[DATA_GC100]))
+    add_devices(binary_sensors, True)
+
+
+class GC100BinarySensor(BinarySensorDevice):
+    """Representation of a binary sensor from GC100."""
+
+    def __init__(self, name, port_addr, gc100):
+        """Initialize the GC100 binary sensor."""
+        # pylint: disable=no-member
+        self._name = name or DEVICE_DEFAULT_NAME
+        self._port_addr = port_addr
+        self._gc100 = gc100
+        self._state = None
+
+        # Subscribe to be notified about state changes (PUSH)
+        self._gc100.subscribe(self._port_addr, self.set_state)
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return self._name
+
+    @property
+    def is_on(self):
+        """Return the state of the entity."""
+        return self._state
+
+    def update(self):
+        """Update the sensor state."""
+        self._gc100.read_sensor(self._port_addr, self.set_state)
+
+    def set_state(self, state):
+        """Set the current state."""
+        self._state = state == 1
+        self.schedule_update_ha_state()