Add HomematicIP Cloud dimmer light device (#15456)

* Add dimmable light device

* Add imports

* Fix float and int conversion

homeassistant/components/light/homematicip_cloud.py

@@ -7,7 +7,8 @@ https://home-assistant.io/components/light.homematicip_cloud/
 
 import logging
 
-from homeassistant.components.light import Light
+from homeassistant.components.light import (
+    Light, ATTR_BRIGHTNESS, SUPPORT_BRIGHTNESS)
 from homeassistant.components.homematicip_cloud import (
     HomematicipGenericDevice, DOMAIN as HMIPC_DOMAIN,
     HMIPC_HAPID)
@@ -30,13 +31,15 @@ async def async_setup_platform(hass, config, async_add_devices,
 async def async_setup_entry(hass, config_entry, async_add_devices):
     """Set up the HomematicIP lights from a config entry."""
     from homematicip.aio.device import (
-        AsyncBrandSwitchMeasuring)
+        AsyncBrandSwitchMeasuring, AsyncPluggableDimmer)
 
     home = hass.data[HMIPC_DOMAIN][config_entry.data[HMIPC_HAPID]].home
     devices = []
     for device in home.devices:
         if isinstance(device, AsyncBrandSwitchMeasuring):
             devices.append(HomematicipLightMeasuring(home, device))
+        elif isinstance(device, AsyncPluggableDimmer):
+            devices.append(HomematicipDimmer(home, device))
 
     if devices:
         async_add_devices(devices)
@@ -79,3 +82,38 @@ class HomematicipLightMeasuring(HomematicipLight):
             ATTR_ENERGIE_COUNTER: round(self._device.energyCounter, 2)
         })
         return attr
+
+
+class HomematicipDimmer(HomematicipGenericDevice, Light):
+    """MomematicIP dimmer light device."""
+
+    def __init__(self, home, device):
+        """Initialize the dimmer light device."""
+        super().__init__(home, device)
+
+    @property
+    def is_on(self):
+        """Return true if device is on."""
+        return self._device.dimLevel != 0
+
+    @property
+    def brightness(self):
+        """Return the brightness of this light between 0..255."""
+        return int(self._device.dimLevel*255)
+
+    @property
+    def supported_features(self):
+        """Flag supported features."""
+        return SUPPORT_BRIGHTNESS
+
+    async def async_turn_on(self, **kwargs):
+        """Turn the light on."""
+        if ATTR_BRIGHTNESS in kwargs:
+            await self._device.set_dim_level(
+                kwargs[ATTR_BRIGHTNESS]/255.0)
+        else:
+            await self._device.set_dim_level(1)
+
+    async def async_turn_off(self, **kwargs):
+        """Turn the light off."""
+        await self._device.set_dim_level(0)