diff --git a/homeassistant/components/ads/binary_sensor.py b/homeassistant/components/ads/binary_sensor.py
index 4704026e454..72a12506dc1 100644
--- a/homeassistant/components/ads/binary_sensor.py
+++ b/homeassistant/components/ads/binary_sensor.py
@@ -19,6 +19,7 @@ from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from .const import CONF_ADS_VAR, DATA_ADS, STATE_KEY_STATE
 from .entity import AdsEntity
+from .hub import AdsHub
 
 DEFAULT_NAME = "ADS binary sensor"
 PLATFORM_SCHEMA = BINARY_SENSOR_PLATFORM_SCHEMA.extend(
@@ -50,7 +51,13 @@ def setup_platform(
 class AdsBinarySensor(AdsEntity, BinarySensorEntity):
     """Representation of ADS binary sensors."""
 
-    def __init__(self, ads_hub, name, ads_var, device_class):
+    def __init__(
+        self,
+        ads_hub: AdsHub,
+        name: str,
+        ads_var: str,
+        device_class: BinarySensorDeviceClass | None,
+    ) -> None:
         """Initialize ADS binary sensor."""
         super().__init__(ads_hub, name, ads_var)
         self._attr_device_class = device_class or BinarySensorDeviceClass.MOVING
diff --git a/homeassistant/components/ads/cover.py b/homeassistant/components/ads/cover.py
index 31c1eac5d18..541f8bfc82c 100644
--- a/homeassistant/components/ads/cover.py
+++ b/homeassistant/components/ads/cover.py
@@ -23,6 +23,7 @@ from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from .const import CONF_ADS_VAR, DATA_ADS, STATE_KEY_STATE
 from .entity import AdsEntity
+from .hub import AdsHub
 
 DEFAULT_NAME = "ADS Cover"
 
@@ -57,7 +58,7 @@ def setup_platform(
     """Set up the cover platform for ADS."""
     ads_hub = hass.data[DATA_ADS]
 
-    ads_var_is_closed: str | None = config.get(CONF_ADS_VAR)
+    ads_var_is_closed: str = config[CONF_ADS_VAR]
     ads_var_position: str | None = config.get(CONF_ADS_VAR_POSITION)
     ads_var_pos_set: str | None = config.get(CONF_ADS_VAR_SET_POS)
     ads_var_open: str | None = config.get(CONF_ADS_VAR_OPEN)
@@ -88,16 +89,16 @@ class AdsCover(AdsEntity, CoverEntity):
 
     def __init__(
         self,
-        ads_hub,
-        ads_var_is_closed,
-        ads_var_position,
-        ads_var_pos_set,
-        ads_var_open,
-        ads_var_close,
-        ads_var_stop,
-        name,
-        device_class,
-    ):
+        ads_hub: AdsHub,
+        ads_var_is_closed: str,
+        ads_var_position: str | None,
+        ads_var_pos_set: str | None,
+        ads_var_open: str | None,
+        ads_var_close: str | None,
+        ads_var_stop: str | None,
+        name: str,
+        device_class: CoverDeviceClass | None,
+    ) -> None:
         """Initialize AdsCover entity."""
         super().__init__(ads_hub, name, ads_var_is_closed)
         if self._attr_unique_id is None:
diff --git a/homeassistant/components/ads/entity.py b/homeassistant/components/ads/entity.py
index 3973d279a22..f51ede2bbc8 100644
--- a/homeassistant/components/ads/entity.py
+++ b/homeassistant/components/ads/entity.py
@@ -3,10 +3,12 @@
 import asyncio
 from asyncio import timeout
 import logging
+from typing import Any
 
 from homeassistant.helpers.entity import Entity
 
 from .const import STATE_KEY_STATE
+from .hub import AdsHub
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -16,19 +18,23 @@ class AdsEntity(Entity):
 
     _attr_should_poll = False
 
-    def __init__(self, ads_hub, name, ads_var):
+    def __init__(self, ads_hub: AdsHub, name: str, ads_var: str) -> None:
         """Initialize ADS binary sensor."""
-        self._state_dict = {}
+        self._state_dict: dict[str, Any] = {}
         self._state_dict[STATE_KEY_STATE] = None
         self._ads_hub = ads_hub
         self._ads_var = ads_var
-        self._event = None
+        self._event: asyncio.Event | None = None
         self._attr_unique_id = ads_var
         self._attr_name = name
 
     async def async_initialize_device(
-        self, ads_var, plctype, state_key=STATE_KEY_STATE, factor=None
-    ):
+        self,
+        ads_var: str,
+        plctype: type,
+        state_key: str = STATE_KEY_STATE,
+        factor: int | None = None,
+    ) -> None:
         """Register device notification."""
 
         def update(name, value):
diff --git a/homeassistant/components/ads/light.py b/homeassistant/components/ads/light.py
index 17e94923b01..5ea4868bf11 100644
--- a/homeassistant/components/ads/light.py
+++ b/homeassistant/components/ads/light.py
@@ -21,6 +21,7 @@ from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 
 from .const import CONF_ADS_VAR, DATA_ADS, STATE_KEY_STATE
 from .entity import AdsEntity
+from .hub import AdsHub
 
 CONF_ADS_VAR_BRIGHTNESS = "adsvar_brightness"
 STATE_KEY_BRIGHTNESS = "brightness"
@@ -54,7 +55,13 @@ def setup_platform(
 class AdsLight(AdsEntity, LightEntity):
     """Representation of ADS light."""
 
-    def __init__(self, ads_hub, ads_var_enable, ads_var_brightness, name):
+    def __init__(
+        self,
+        ads_hub: AdsHub,
+        ads_var_enable: str,
+        ads_var_brightness: str | None,
+        name: str,
+    ) -> None:
         """Initialize AdsLight entity."""
         super().__init__(ads_hub, name, ads_var_enable)
         self._state_dict[STATE_KEY_BRIGHTNESS] = None
diff --git a/homeassistant/components/ads/valve.py b/homeassistant/components/ads/valve.py
index f20e21477db..b94215ec9ea 100644
--- a/homeassistant/components/ads/valve.py
+++ b/homeassistant/components/ads/valve.py
@@ -45,11 +45,8 @@ def setup_platform(
     ads_var: str = config[CONF_ADS_VAR]
     name: str = config[CONF_NAME]
     device_class: ValveDeviceClass | None = config.get(CONF_DEVICE_CLASS)
-    supported_features: ValveEntityFeature = (
-        ValveEntityFeature.OPEN | ValveEntityFeature.CLOSE
-    )
 
-    entity = AdsValve(ads_hub, ads_var, name, device_class, supported_features)
+    entity = AdsValve(ads_hub, ads_var, name, device_class)
 
     add_entities([entity])
 
@@ -57,18 +54,18 @@ def setup_platform(
 class AdsValve(AdsEntity, ValveEntity):
     """Representation of an ADS valve entity."""
 
+    _attr_supported_features = ValveEntityFeature.OPEN | ValveEntityFeature.CLOSE
+
     def __init__(
         self,
         ads_hub: AdsHub,
         ads_var: str,
         name: str,
         device_class: ValveDeviceClass | None,
-        supported_features: ValveEntityFeature,
     ) -> None:
         """Initialize AdsValve entity."""
         super().__init__(ads_hub, name, ads_var)
         self._attr_device_class = device_class
-        self._attr_supported_features = supported_features
         self._attr_reports_position = False
         self._attr_is_closed = True