Add Tuya fan support (#15525)

* Add Tuya fan platform

* Add Tuya fan platform

* fix as review required

homeassistant/components/fan/tuya.py

@@ -0,0 +1,99 @@
+"""
+Support for Tuya fans.
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/fan.tuya/
+"""
+
+from homeassistant.components.fan import (
+    ENTITY_ID_FORMAT, FanEntity, SUPPORT_OSCILLATE, SUPPORT_SET_SPEED)
+from homeassistant.components.tuya import DATA_TUYA, TuyaDevice
+from homeassistant.const import STATE_OFF
+
+DEPENDENCIES = ['tuya']
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Set up Tuya fan platform."""
+    if discovery_info is None:
+        return
+    tuya = hass.data[DATA_TUYA]
+    dev_ids = discovery_info.get('dev_ids')
+    devices = []
+    for dev_id in dev_ids:
+        device = tuya.get_device_by_id(dev_id)
+        if device is None:
+            continue
+        devices.append(TuyaFanDevice(device))
+    add_devices(devices)
+
+
+class TuyaFanDevice(TuyaDevice, FanEntity):
+    """Tuya fan devices."""
+
+    def __init__(self, tuya):
+        """Init Tuya fan device."""
+        super().__init__(tuya)
+        self.entity_id = ENTITY_ID_FORMAT.format(tuya.object_id())
+        self.speeds = [STATE_OFF]
+
+    async def async_added_to_hass(self):
+        """Create fan list when add to hass."""
+        await super().async_added_to_hass()
+        self.speeds.extend(self.tuya.speed_list())
+
+    def set_speed(self, speed: str) -> None:
+        """Set the speed of the fan."""
+        if speed == STATE_OFF:
+            self.turn_off()
+        else:
+            self.tuya.set_speed(speed)
+
+    def turn_on(self, speed: str = None, **kwargs) -> None:
+        """Turn on the fan."""
+        if speed is not None:
+            self.set_speed(speed)
+        else:
+            self.tuya.turn_on()
+
+    def turn_off(self, **kwargs) -> None:
+        """Turn the entity off."""
+        self.tuya.turn_off()
+
+    def oscillate(self, oscillating) -> None:
+        """Oscillate the fan."""
+        self.tuya.oscillate(oscillating)
+
+    @property
+    def oscillating(self):
+        """Return current oscillating status."""
+        if self.supported_features & SUPPORT_OSCILLATE == 0:
+            return None
+        if self.speed == STATE_OFF:
+            return False
+        return self.tuya.oscillating()
+
+    @property
+    def is_on(self):
+        """Return true if the entity is on."""
+        return self.tuya.state()
+
+    @property
+    def speed(self) -> str:
+        """Return the current speed."""
+        if self.is_on:
+            return self.tuya.speed()
+        return STATE_OFF
+
+    @property
+    def speed_list(self) -> list:
+        """Get the list of available speeds."""
+        return self.speeds
+
+    @property
+    def supported_features(self) -> int:
+        """Flag supported features."""
+        supports = SUPPORT_SET_SPEED
+        if self.tuya.support_oscillate():
+            supports = supports | SUPPORT_OSCILLATE
+        return supports

homeassistant/components/tuya.py

@@ -34,6 +34,7 @@ SERVICE_PULL_DEVICES = 'pull_devices'
 
 TUYA_TYPE_TO_HA = {
     'climate': 'climate',
+    'fan': 'fan',
     'light': 'light',
     'switch': 'switch',
 }