MCP23017 (#23127)

* Added support for MCP23017 I2C GPIO extender.

* Updated .coveragerc to exclude mcp23017 component from tests.

* Generated CODEOWNERS for mcp23017 usign script.

* Removed .svn folder that had been accidentally uploaded.

* Added link to www.home-assistant.io docs in manifest.json

* Fixed logic error in switch platform.

* Cleaned up code and removed unnecessary should_poll() function.

* Limited the options for pull mode to UP and DOWN

* Fixed line too long in binary sensor.

* Fixed line too long on switch.py

* Changed to setup_platform.

* Reorder constants

homeassistant/components/mcp23017/switch.py

@@ -0,0 +1,92 @@
+"""Support for switch sensor using I2C MCP23017 chip."""
+import logging
+
+import voluptuous as vol
+
+from homeassistant.components.switch import PLATFORM_SCHEMA
+from homeassistant.const import DEVICE_DEFAULT_NAME
+from homeassistant.helpers.entity import ToggleEntity
+import homeassistant.helpers.config_validation as cv
+
+_LOGGER = logging.getLogger(__name__)
+
+CONF_INVERT_LOGIC = 'invert_logic'
+CONF_I2C_ADDRESS = 'i2c_address'
+CONF_PINS = 'pins'
+CONF_PULL_MODE = 'pull_mode'
+
+DEFAULT_INVERT_LOGIC = False
+DEFAULT_I2C_ADDRESS = 0x20
+
+_SWITCHES_SCHEMA = vol.Schema({
+    cv.positive_int: cv.string,
+})
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_PINS): _SWITCHES_SCHEMA,
+    vol.Optional(CONF_INVERT_LOGIC, default=DEFAULT_INVERT_LOGIC): cv.boolean,
+    vol.Optional(CONF_I2C_ADDRESS, default=DEFAULT_I2C_ADDRESS):
+    vol.Coerce(int),
+})
+
+
+def setup_platform(hass, config, add_entities, discovery_info=None):
+    """Set up the MCP23017 devices."""
+    import board
+    import busio
+    import adafruit_mcp230xx
+
+    invert_logic = config.get(CONF_INVERT_LOGIC)
+    i2c_address = config.get(CONF_I2C_ADDRESS)
+
+    i2c = busio.I2C(board.SCL, board.SDA)
+    mcp = adafruit_mcp230xx.MCP23017(i2c, address=i2c_address)
+
+    switches = []
+    pins = config.get(CONF_PINS)
+    for pin_num, pin_name in pins.items():
+        pin = mcp.get_pin(pin_num)
+        switches.append(MCP23017Switch(pin_name, pin, invert_logic))
+    add_entities(switches)
+
+
+class MCP23017Switch(ToggleEntity):
+    """Representation of a  MCP23017 output pin."""
+
+    def __init__(self, name, pin, invert_logic):
+        """Initialize the pin."""
+        import digitalio
+        self._name = name or DEVICE_DEFAULT_NAME
+        self._pin = pin
+        self._invert_logic = invert_logic
+        self._state = False
+
+        self._pin.direction = digitalio.Direction.OUTPUT
+        self._pin.value = self._invert_logic
+
+    @property
+    def name(self):
+        """Return the name of the switch."""
+        return self._name
+
+    @property
+    def should_poll(self):
+        """No polling needed."""
+        return False
+
+    @property
+    def is_on(self):
+        """Return true if device is on."""
+        return self._state
+
+    def turn_on(self, **kwargs):
+        """Turn the device on."""
+        self._pin.value = not self._invert_logic
+        self._state = True
+        self.schedule_update_ha_state()
+
+    def turn_off(self, **kwargs):
+        """Turn the device off."""
+        self._pin.value = self._invert_logic
+        self._state = False
+        self.schedule_update_ha_state()