Add light support to Velbus integration (#30323)

* Add light support to Velbus integration

* Add Velbus light.py to .coveragerc

* Applied black formatting

.coveragerc

@@ -758,6 +758,7 @@ omit =
     homeassistant/components/velbus/climate.py
     homeassistant/components/velbus/const.py
     homeassistant/components/velbus/cover.py
+    homeassistant/components/velbus/light.py
     homeassistant/components/velbus/sensor.py
     homeassistant/components/velbus/switch.py
     homeassistant/components/velux/*

homeassistant/components/velbus/__init__.py

@@ -22,7 +22,7 @@ CONFIG_SCHEMA = vol.Schema(
     {DOMAIN: vol.Schema({vol.Required(CONF_PORT): cv.string})}, extra=vol.ALLOW_EXTRA
 )
 
-COMPONENT_TYPES = ["switch", "sensor", "binary_sensor", "cover", "climate"]
+COMPONENT_TYPES = ["switch", "sensor", "binary_sensor", "cover", "climate", "light"]
 
 
 async def async_setup(hass, config):

homeassistant/components/velbus/light.py

@@ -0,0 +1,77 @@
+"""Support for Velbus light."""
+import logging
+
+from velbus.util import VelbusException
+
+from homeassistant.components.light import (
+    ATTR_BRIGHTNESS,
+    ATTR_TRANSITION,
+    SUPPORT_BRIGHTNESS,
+    SUPPORT_TRANSITION,
+    Light,
+)
+
+from . import VelbusEntity
+from .const import DOMAIN
+
+_LOGGER = logging.getLogger(__name__)
+
+
+async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
+    """Old way."""
+    pass
+
+
+async def async_setup_entry(hass, entry, async_add_entities):
+    """Set up Velbus light based on config_entry."""
+    cntrl = hass.data[DOMAIN][entry.entry_id]["cntrl"]
+    modules_data = hass.data[DOMAIN][entry.entry_id]["light"]
+    entities = []
+    for address, channel in modules_data:
+        module = cntrl.get_module(address)
+        entities.append(VelbusLight(module, channel))
+    async_add_entities(entities)
+
+
+class VelbusLight(VelbusEntity, Light):
+    """Representation of a Velbus light."""
+
+    @property
+    def supported_features(self):
+        """Flag supported features."""
+        return SUPPORT_BRIGHTNESS | SUPPORT_TRANSITION
+
+    @property
+    def is_on(self):
+        """Return true if the light is on."""
+        return self._module.is_on(self._channel)
+
+    @property
+    def brightness(self):
+        """Return the brightness of the light."""
+        return self._module.get_dimmer_state(self._channel)
+
+    def turn_on(self, **kwargs):
+        """Instruct the Velbus light to turn on."""
+        try:
+            if ATTR_BRIGHTNESS in kwargs:
+                self._module.set_dimmer_state(
+                    self._channel,
+                    kwargs[ATTR_BRIGHTNESS],
+                    kwargs.get(ATTR_TRANSITION, 0),
+                )
+            else:
+                self._module.restore_dimmer_state(
+                    self._channel, kwargs.get(ATTR_TRANSITION, 0),
+                )
+        except VelbusException as err:
+            _LOGGER.error("A Velbus error occurred: %s", err)
+
+    def turn_off(self, **kwargs):
+        """Instruct the velbus light to turn off."""
+        try:
+            self._module.set_dimmer_state(
+                self._channel, 0, kwargs.get(ATTR_TRANSITION, 0),
+            )
+        except VelbusException as err:
+            _LOGGER.error("A Velbus error occurred: %s", err)