Add binary_sensor platform for Xiaomi Miio integration (#54096)

.coveragerc

@@ -1202,6 +1202,7 @@ omit =
     homeassistant/components/xiaomi_miio/__init__.py
     homeassistant/components/xiaomi_miio/air_quality.py
     homeassistant/components/xiaomi_miio/alarm_control_panel.py
+    homeassistant/components/xiaomi_miio/binary_sensor.py
     homeassistant/components/xiaomi_miio/device.py
     homeassistant/components/xiaomi_miio/device_tracker.py
     homeassistant/components/xiaomi_miio/fan.py

homeassistant/components/xiaomi_miio/__init__.py

@@ -37,7 +37,14 @@ _LOGGER = logging.getLogger(__name__)
 GATEWAY_PLATFORMS = ["alarm_control_panel", "light", "sensor", "switch"]
 SWITCH_PLATFORMS = ["switch"]
 FAN_PLATFORMS = ["fan"]
-HUMIDIFIER_PLATFORMS = ["humidifier", "number", "select", "sensor", "switch"]
+HUMIDIFIER_PLATFORMS = [
+    "binary_sensor",
+    "humidifier",
+    "number",
+    "select",
+    "sensor",
+    "switch",
+]
 LIGHT_PLATFORMS = ["light"]
 VACUUM_PLATFORMS = ["vacuum"]
 AIR_MONITOR_PLATFORMS = ["air_quality", "sensor"]

homeassistant/components/xiaomi_miio/binary_sensor.py

@@ -0,0 +1,87 @@
+"""Support for Xiaomi Miio binary sensors."""
+from enum import Enum
+
+from homeassistant.components.binary_sensor import (
+    BinarySensorEntity,
+    BinarySensorEntityDescription,
+)
+
+from .const import (
+    CONF_DEVICE,
+    CONF_FLOW_TYPE,
+    CONF_MODEL,
+    DOMAIN,
+    KEY_COORDINATOR,
+    KEY_DEVICE,
+    MODELS_HUMIDIFIER_MJJSQ,
+)
+from .device import XiaomiCoordinatedMiioEntity
+
+ATTR_NO_WATER = "no_water"
+ATTR_WATER_TANK_DETACHED = "water_tank_detached"
+
+BINARY_SENSOR_TYPES = (
+    BinarySensorEntityDescription(
+        key=ATTR_NO_WATER,
+        name="Water Tank Empty",
+        icon="mdi:water-off-outline",
+    ),
+    BinarySensorEntityDescription(
+        key=ATTR_WATER_TANK_DETACHED,
+        name="Water Tank Detached",
+        icon="mdi:flask-empty-off-outline",
+    ),
+)
+
+HUMIDIFIER_MJJSQ_BINARY_SENSORS = (ATTR_NO_WATER, ATTR_WATER_TANK_DETACHED)
+
+
+async def async_setup_entry(hass, config_entry, async_add_entities):
+    """Set up the Xiaomi sensor from a config entry."""
+    entities = []
+
+    if config_entry.data[CONF_FLOW_TYPE] == CONF_DEVICE:
+        model = config_entry.data[CONF_MODEL]
+        sensors = []
+        if model in MODELS_HUMIDIFIER_MJJSQ:
+            sensors = HUMIDIFIER_MJJSQ_BINARY_SENSORS
+        for description in BINARY_SENSOR_TYPES:
+            if description.key not in sensors:
+                continue
+            entities.append(
+                XiaomiGenericBinarySensor(
+                    f"{config_entry.title} {description.name}",
+                    hass.data[DOMAIN][config_entry.entry_id][KEY_DEVICE],
+                    config_entry,
+                    f"{description.key}_{config_entry.unique_id}",
+                    hass.data[DOMAIN][config_entry.entry_id][KEY_COORDINATOR],
+                    description,
+                )
+            )
+
+    async_add_entities(entities)
+
+
+class XiaomiGenericBinarySensor(XiaomiCoordinatedMiioEntity, BinarySensorEntity):
+    """Representation of a Xiaomi Humidifier binary sensor."""
+
+    def __init__(self, name, device, entry, unique_id, coordinator, description):
+        """Initialize the entity."""
+        super().__init__(name, device, entry, unique_id, coordinator)
+
+        self.entity_description = description
+
+    @property
+    def is_on(self):
+        """Return true if the binary sensor is on."""
+        return self._extract_value_from_attribute(
+            self.coordinator.data, self.entity_description.key
+        )
+
+    @staticmethod
+    def _extract_value_from_attribute(state, attribute):
+        value = getattr(state, attribute)
+        if isinstance(value, Enum):
+            return value.value
+
+        return value