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/binary_sensor.py

@@ -0,0 +1,89 @@
+"""Support for binary sensor using I2C MCP23017 chip."""
+import logging
+
+import voluptuous as vol
+
+from homeassistant.components.binary_sensor import (
+    BinarySensorDevice, PLATFORM_SCHEMA)
+from homeassistant.const import DEVICE_DEFAULT_NAME
+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'
+
+MODE_UP = 'UP'
+MODE_DOWN = 'DOWN'
+
+DEFAULT_INVERT_LOGIC = False
+DEFAULT_I2C_ADDRESS = 0x20
+DEFAULT_PULL_MODE = MODE_UP
+
+_SENSORS_SCHEMA = vol.Schema({
+    cv.positive_int: cv.string,
+})
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_PINS): _SENSORS_SCHEMA,
+    vol.Optional(CONF_INVERT_LOGIC, default=DEFAULT_INVERT_LOGIC): cv.boolean,
+    vol.Optional(CONF_PULL_MODE, default=DEFAULT_PULL_MODE):
+        vol.All(vol.Upper, vol.In([MODE_UP, MODE_DOWN])),
+    vol.Optional(CONF_I2C_ADDRESS, default=DEFAULT_I2C_ADDRESS):
+    vol.Coerce(int),
+})
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Set up the MCP23017 binary sensors."""
+    import board
+    import busio
+    import adafruit_mcp230xx
+
+    pull_mode = config[CONF_PULL_MODE]
+    invert_logic = config[CONF_INVERT_LOGIC]
+    i2c_address = config[CONF_I2C_ADDRESS]
+
+    i2c = busio.I2C(board.SCL, board.SDA)
+    mcp = adafruit_mcp230xx.MCP23017(i2c, address=i2c_address)
+
+    binary_sensors = []
+    pins = config[CONF_PINS]
+
+    for pin_num, pin_name in pins.items():
+        pin = mcp.get_pin(pin_num)
+        binary_sensors.append(MCP23017BinarySensor(
+            pin_name, pin, pull_mode, invert_logic))
+
+    add_devices(binary_sensors, True)
+
+
+class MCP23017BinarySensor(BinarySensorDevice):
+    """Represent a binary sensor that uses MCP23017."""
+
+    def __init__(self, name, pin, pull_mode, invert_logic):
+        """Initialize the MCP23017 binary sensor."""
+        import digitalio
+        self._name = name or DEVICE_DEFAULT_NAME
+        self._pin = pin
+        self._pull_mode = pull_mode
+        self._invert_logic = invert_logic
+        self._state = None
+        self._pin.direction = digitalio.Direction.INPUT
+        self._pin.pull = digitalio.Pull.UP
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return self._name
+
+    @property
+    def is_on(self):
+        """Return the state of the entity."""
+        return self._state != self._invert_logic
+
+    def update(self):
+        """Update the GPIO state."""
+        self._state = self._pin.value