Migrate niko_home_control light to color_mode (#70914)

* Migrate niko_home_control light to color_mode

* Remove useless brightness related code

homeassistant/components/niko_home_control/light.py

@@ -8,7 +8,7 @@ import nikohomecontrol
 import voluptuous as vol
 
 # Import the device class from the component that you want to support
-from homeassistant.components.light import ATTR_BRIGHTNESS, PLATFORM_SCHEMA, LightEntity
+from homeassistant.components.light import PLATFORM_SCHEMA, ColorMode, LightEntity
 from homeassistant.const import CONF_HOST
 from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import PlatformNotReady
@@ -51,6 +51,9 @@ async def async_setup_platform(
 class NikoHomeControlLight(LightEntity):
     """Representation of an Niko Light."""
 
+    _attr_color_mode = ColorMode.ONOFF
+    _attr_supported_color_modes = {ColorMode.ONOFF}
+
     def __init__(self, light, data):
         """Set up the Niko Home Control light platform."""
         self._data = data
@@ -58,7 +61,6 @@ class NikoHomeControlLight(LightEntity):
         self._unique_id = f"light-{light.id}"
         self._name = light.name
         self._state = light.is_on
-        self._brightness = None
 
     @property
     def unique_id(self):
@@ -70,11 +72,6 @@ class NikoHomeControlLight(LightEntity):
         """Return the display name of this light."""
         return self._name
 
-    @property
-    def brightness(self):
-        """Return the brightness of the light."""
-        return self._brightness
-
     @property
     def is_on(self):
         """Return true if light is on."""
@@ -82,7 +79,6 @@ class NikoHomeControlLight(LightEntity):
 
     def turn_on(self, **kwargs):
         """Instruct the light to turn on."""
-        self._light.brightness = kwargs.get(ATTR_BRIGHTNESS, 255)
         _LOGGER.debug("Turn on: %s", self.name)
         self._light.turn_on()