Add binary_sensor to ElkM1 integration (#74485)

* Add binary_sensor to ElkM1 integration

* Update for review comments.

* Fix black.

* Fix pylint error.

Co-authored-by: J. Nick Koston <nick@koston.org>

homeassistant/components/elkm1/binary_sensor.py

@@ -0,0 +1,57 @@
+"""Support for control of ElkM1 binary sensors."""
+from __future__ import annotations
+
+from typing import Any
+
+from elkm1_lib.const import ZoneLogicalStatus, ZoneType
+from elkm1_lib.elements import Element
+from elkm1_lib.zones import Zone
+
+from homeassistant.components.binary_sensor import BinarySensorEntity
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+
+from . import ElkAttachedEntity, ElkEntity
+from .const import DOMAIN
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    config_entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Create the Elk-M1 sensor platform."""
+
+    elk_data = hass.data[DOMAIN][config_entry.entry_id]
+    auto_configure = elk_data["auto_configure"]
+    elk = elk_data["elk"]
+
+    entities: list[ElkEntity] = []
+    for element in elk.zones:
+        # Don't create binary sensors for zones that are analog
+        if element.definition in {ZoneType.TEMPERATURE, ZoneType.ANALOG_ZONE}:
+            continue
+
+        if auto_configure:
+            if not element.configured:
+                continue
+        elif not elk_data["config"]["zone"]["included"][element.index]:
+            continue
+
+        entities.append(ElkBinarySensor(element, elk, elk_data))
+
+    async_add_entities(entities)
+
+
+class ElkBinarySensor(ElkAttachedEntity, BinarySensorEntity):
+    """Representation of ElkM1 binary sensor."""
+
+    _element: Zone
+    _attr_entity_registry_enabled_default = False
+
+    def _element_changed(self, _: Element, changeset: Any) -> None:
+        # Zone in NORMAL state is OFF; any other state is ON
+        self._attr_is_on = bool(
+            self._element.logical_status != ZoneLogicalStatus.NORMAL
+        )