feat: initial release — LedGrab Home Assistant integration

HACS-compatible custom component split out from the main LedGrab repo.
Creates light, switch, sensor, number, and select entities for each
configured LedGrab device.

custom_components/ledgrab/button.py

@@ -0,0 +1,74 @@
+"""Button platform for LED Screen Controller — scene preset activation."""
+from __future__ import annotations
+
+import logging
+from typing import Any
+
+from homeassistant.components.button import ButtonEntity
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers.entity_platform import AddEntitiesCallback
+from homeassistant.helpers.update_coordinator import CoordinatorEntity
+
+from .const import DOMAIN, DATA_COORDINATOR
+from .coordinator import LedGrabCoordinator
+
+_LOGGER = logging.getLogger(__name__)
+
+
+async def async_setup_entry(
+    hass: HomeAssistant,
+    entry: ConfigEntry,
+    async_add_entities: AddEntitiesCallback,
+) -> None:
+    """Set up scene preset buttons."""
+    data = hass.data[DOMAIN][entry.entry_id]
+    coordinator: LedGrabCoordinator = data[DATA_COORDINATOR]
+
+    entities = []
+    if coordinator.data:
+        for preset in coordinator.data.get("scene_presets", []):
+            entities.append(
+                SceneActivateButton(coordinator, preset, entry.entry_id)
+            )
+
+    async_add_entities(entities)
+
+
+class SceneActivateButton(CoordinatorEntity, ButtonEntity):
+    """Button that activates a scene preset."""
+
+    _attr_has_entity_name = True
+
+    def __init__(
+        self,
+        coordinator: LedGrabCoordinator,
+        preset: dict[str, Any],
+        entry_id: str,
+    ) -> None:
+        """Initialize the button."""
+        super().__init__(coordinator)
+        self._preset_id = preset["id"]
+        self._entry_id = entry_id
+        self._attr_unique_id = f"{entry_id}_scene_{preset['id']}"
+        self._attr_translation_key = "activate_scene"
+        self._attr_translation_placeholders = {"scene_name": preset["name"]}
+        self._attr_icon = "mdi:palette"
+
+    @property
+    def device_info(self) -> dict[str, Any]:
+        """Return device information — all scene buttons belong to the Scenes device."""
+        return {"identifiers": {(DOMAIN, f"{self._entry_id}_scenes")}}
+
+    @property
+    def available(self) -> bool:
+        """Return if entity is available."""
+        if not self.coordinator.data:
+            return False
+        return self._preset_id in {
+            p["id"] for p in self.coordinator.data.get("scene_presets", [])
+        }
+
+    async def async_press(self) -> None:
+        """Activate the scene preset."""
+        await self.coordinator.activate_scene(self._preset_id)