Add tradfri device info (#16768)

homeassistant/components/light/tradfri.py

@@ -13,7 +13,8 @@ from homeassistant.components.light import (
     SUPPORT_COLOR, Light)
 from homeassistant.components.light import \
     PLATFORM_SCHEMA as LIGHT_PLATFORM_SCHEMA
-from homeassistant.components.tradfri import KEY_GATEWAY, KEY_API
+from homeassistant.components.tradfri import (
+    KEY_GATEWAY, KEY_API, DOMAIN as TRADFRI_DOMAIN)
 from homeassistant.components.tradfri.const import (
     CONF_IMPORT_GROUPS, CONF_GATEWAY_ID)
 import homeassistant.util.color as color_util
@@ -161,6 +162,7 @@ class TradfriLight(Light):
         self._hs_color = None
         self._features = SUPPORTED_FEATURES
         self._available = True
+        self._gateway_id = gateway_id
 
         self._refresh(light)
 
@@ -169,6 +171,22 @@ class TradfriLight(Light):
         """Return unique ID for light."""
         return self._unique_id
 
+    @property
+    def device_info(self):
+        """Return the device info."""
+        info = self._light.device_info
+
+        return {
+            'identifiers': {
+                (TRADFRI_DOMAIN, self._light.id)
+            },
+            'name': self._name,
+            'manufacturer': info.manufacturer,
+            'model': info.model_number,
+            'sw_version': info.firmware_version,
+            'via_hub': (TRADFRI_DOMAIN, self._gateway_id),
+        }
+
     @property
     def min_mireds(self):
         """Return the coldest color_temp that this light supports."""