text: import voluptuous as vol
  
  from pi4home import pins
  import pi4home.config_validation as cv
  from pi4home.const import CONF_ADDRESS, CONF_ID, CONF_PCF8575
  from pi4home.cpp_generator import Pvariable
  from pi4home.cpp_helpers import setup_component
  from pi4home.cpp_types import App, GPIOInputPin, GPIOOutputPin, io_ns
  
  DEPENDENCIES = ['i2c']
  MULTI_CONF = True
  
  PCF8574GPIOMode = io_ns.enum('PCF8574GPIOMode')
  PCF8675_GPIO_MODES = {
      'INPUT': PCF8574GPIOMode.PCF8574_INPUT,
      'INPUT_PULLUP': PCF8574GPIOMode.PCF8574_INPUT_PULLUP,
      'OUTPUT': PCF8574GPIOMode.PCF8574_OUTPUT,
  }
  
  PCF8574GPIOInputPin = io_ns.class_('PCF8574GPIOInputPin', GPIOInputPin)
  PCF8574GPIOOutputPin = io_ns.class_('PCF8574GPIOOutputPin', GPIOOutputPin)
  
  CONFIG_SCHEMA = cv.Schema({
      vol.Required(CONF_ID): cv.declare_variable_id(pins.PCF8574Component),
      vol.Optional(CONF_ADDRESS, default=0x21): cv.i2c_address,
      vol.Optional(CONF_PCF8575, default=False): cv.boolean,
  }).extend(cv.COMPONENT_SCHEMA.schema)
  
  
  def to_code(config):
      rhs = App.make_pcf8574_component(config[CONF_ADDRESS], config[CONF_PCF8575])
      var = Pvariable(config[CONF_ID], rhs)
      setup_component(var, config)
  
  
  BUILD_FLAGS = '-DUSE_PCF8574'
  