__init__.py

import abc

from enum import Enum


BASE_SCHEMA = {
    "name": {
        "required": True,
        "empty": False
    },
    "module": {
        "required": True,
        "empty": False
    },
    "cleanup": {
        "required": False,
        "type": "boolean",
        "default": True
    }
}


class PinDirection(Enum):
    INPUT = 0
    OUTPUT = 1


class PinPullup(Enum):
    OFF = 0
    UP = 1
    DOWN = 2


class GenericGPIO(object):
    """
    Abstracts a generic GPIO interface to be implemented by the modules in this
    directory.
    """
    __metaclass__ = abc.ABCMeta

    @abc.abstractmethod
    def setup_pin(self, pin, direction, pullup, pin_config):
        pass

    @abc.abstractmethod
    def set_pin(self, pin, value):
        pass

    @abc.abstractmethod
    def get_pin(self, pin):
        pass

    def cleanup(self):
        """
        Called when closing the program to handle any cleanup operations.
        """
        pass