Add firmware module for smartdevice (#766)

Initial firmware module implementation.

New switch: `Auto update enabled (auto_update_enabled): False`
New binary sensor: `Update available (update_available): False`

kasa/smart/modules/__init__.py

@@ -15,6 +15,7 @@
     "ChildDeviceModule",
     "AutoOffModule",
     "LedModule",
+    "Firmware",
     "CloudModule",
     "LightTransitionModule",
 ]

kasa/smart/modules/firmware.py

@@ -0,0 +1,104 @@
+"""Implementation of firmware module."""
+from typing import TYPE_CHECKING, Dict, Optional
+
+from ...exceptions import SmartErrorCode
+from ...feature import Feature, FeatureType
+from ..smartmodule import SmartModule
+
+try:
+    from pydantic.v1 import BaseModel, Field, validator
+except ImportError:
+    from pydantic import BaseModel, Field, validator
+from datetime import date
+
+if TYPE_CHECKING:
+    from ..smartdevice import SmartDevice
+
+
+class UpdateInfo(BaseModel):
+    """Update info status object."""
+
+    status: int = Field(alias="type")
+    fw_ver: Optional[str] = None
+    release_date: Optional[date] = None
+    release_notes: Optional[str] = Field(alias="release_note", default=None)
+    fw_size: Optional[int] = None
+    oem_id: Optional[str] = None
+    needs_upgrade: bool = Field(alias="need_to_upgrade")
+
+    @validator("release_date", pre=True)
+    def _release_date_optional(cls, v):
+        if not v:
+            return None
+
+        return v
+
+    @property
+    def update_available(self):
+        """Return True if update available."""
+        if self.status != 0:
+            return True
+        return False
+
+
+class Firmware(SmartModule):
+    """Implementation of firmware module."""
+
+    REQUIRED_COMPONENT = "firmware"
+
+    def __init__(self, device: "SmartDevice", module: str):
+        super().__init__(device, module)
+        self._add_feature(
+            Feature(
+                device,
+                "Auto update enabled",
+                container=self,
+                attribute_getter="auto_update_enabled",
+                type=FeatureType.Switch,
+            )
+        )
+        self._add_feature(
+            Feature(
+                device,
+                "Update available",
+                container=self,
+                attribute_getter="update_available",
+                type=FeatureType.BinarySensor,
+            )
+        )
+
+    def query(self) -> Dict:
+        """Query to execute during the update cycle."""
+        return {"get_auto_update_info": None, "get_latest_fw": None}
+
+    @property
+    def latest_firmware(self):
+        """Return latest firmware information."""
+        fw = self.data["get_latest_fw"]
+        if isinstance(fw, SmartErrorCode):
+            # Error in response, probably disconnected from the cloud.
+            return UpdateInfo(type=0, need_to_upgrade=False)
+
+        return UpdateInfo.parse_obj(fw)
+
+    @property
+    def update_available(self):
+        """Return True if update is available."""
+        return self.latest_firmware.update_available
+
+    async def get_update_state(self):
+        """Return update state."""
+        return await self.call("get_fw_download_state")
+
+    async def update(self):
+        """Update the device firmware."""
+        return await self.call("fw_download")
+
+    @property
+    def auto_update_enabled(self):
+        """Return True if autoupdate is enabled."""
+        return self.data["get_auto_update_info"]["enable"]
+
+    async def set_auto_update_enabled(self, enabled: bool):
+        """Change autoupdate setting."""
+        await self.call("set_auto_update_info", {"enable": enabled})