<commit_before>from pi_mqtt_gpio.modules import GenericGPIO, PinDirection, PinPullup, \
                                 InterruptEdge
import asyncio

REQUIREMENTS = ("gpiod",)

DIRECTIONS = None
PULLUPS = None
INTERRUPT = None
GPIO_INTERRUPT_CALLBACK_LOOKUP = {}


class GPIO(GenericGPIO):
    """
    Implementation of GPIO class for Raspberry Pi native GPIO.
    """

    def __init__(self, config):
        global DIRECTIONS, PULLUPS, INTERRUPT
        import gpiod as gpio

        self.io = gpio
        self.chip = config.chip
        self.pins = {}
        self.loop = asyncio.get_event_loop()
        self.loop.run_forever()

        DIRECTIONS = {PinDirection.INPUT: gpio.line_request.DIRECTION_INPUT, PinDirection.OUTPUT: gpio.line_request.DIRECTION_OUTPUT}

        PULLUPS = {
            PinPullup.OFF: gpio.line.BIAS_DISABLE,
            PinPullup.UP: gpio.line.BIAS_PULL_UP,
            PinPullup.DOWN: gpio.line.BIAS_PULL_DOWN,
        }

        INTERRUPT = {
            InterruptEdge.RISING: gpio.line_request.EVENT_RISING_EDGE,
            InterruptEdge.FALLING: gpio.line_request.EVENT_FALLING_EDGE,
            InterruptEdge.BOTH: gpio.line_request.EVENT_BOTH_EDGES
        }

    def setup_pin(self, pin, direction, pullup, pin_config):
        direction = DIRECTIONS[direction]
        offset = pin

        if pullup is None:
            pullup = PULLUPS[PinPullup.OFF]
        else:
            pullup = PULLUPS[pullup]

        pin = self.chip.get_line(offset)
        pin.bias = pullup

        config = self.io.line_request()
        config.consumer = 'pi-mqtt-gpio'

        pin.request(config)
        self.pins[offset] = pin

    def setup_interrupt(self, handle, pin, edge, callback, bouncetime=100):
        """
        install interrupt callback function
        handle:     is returned in the callback function as identification
        pin:        gpio to watch for interrupts
        edge:       triggering edge: RISING, FALLING or BOTH
        callback:   the callback function to be called, when interrupt occurs
        bouncetime: minimum time between two interrupts
        """
        edge = INTERRUPT[edge]
        offset = pin

        pin = self.chip.get_line(offset)

        config = self.io.line_request()
        config.consumer = 'pi-mqtt-gpio'
        config.request_type = edge

        self.loop.create_task(self._add_event_detect(pin, self.interrupt_callback))
        self.GPIO_INTERRUPT_CALLBACK_LOOKUP[offset] = {"handle": handle,
                                                    "callback": callback}

    def set_pin(self, pin, value):
        offset = pin
        self.pins[offset].set_value(value)

    def get_pin(self, pin):
        offset = pin
        return self.pins[offset].get_value()

    def cleanup(self):
        pass

    async def _add_event_detect(self, pin, callback):
        while True:
            if pin.event_wait():
                callback()
<commit_msg>Add threading to watch for gpio interrupts<commit_after>from pi_mqtt_gpio.modules import GenericGPIO, PinDirection, PinPullup, \
                                 InterruptEdge

from threading import Thread

REQUIREMENTS = ("gpiod",)

DIRECTIONS = None
PULLUPS = None
INTERRUPT = None
GPIO_INTERRUPT_CALLBACK_LOOKUP = {}


class GPIO(GenericGPIO):
    """
    Implementation of GPIO class for Raspberry Pi native GPIO.
    """

    def __init__(self, config):
        global DIRECTIONS, PULLUPS, INTERRUPT
        import gpiod as gpio

        self.io = gpio
        self.chip = config.chip
        self.pins = {}
        self.watchers = {}

        DIRECTIONS = {PinDirection.INPUT: gpio.line_request.DIRECTION_INPUT, PinDirection.OUTPUT: gpio.line_request.DIRECTION_OUTPUT}

        PULLUPS = {
            PinPullup.OFF: gpio.line.BIAS_DISABLE,
            PinPullup.UP: gpio.line.BIAS_PULL_UP,
            PinPullup.DOWN: gpio.line.BIAS_PULL_DOWN,
        }

        INTERRUPT = {
            InterruptEdge.RISING: gpio.line_request.EVENT_RISING_EDGE,
            InterruptEdge.FALLING: gpio.line_request.EVENT_FALLING_EDGE,
            InterruptEdge.BOTH: gpio.line_request.EVENT_BOTH_EDGES
        }

    def setup_pin(self, pin, direction, pullup, pin_config):
        direction = DIRECTIONS[direction]
        offset = pin

        if pullup is None:
            pullup = PULLUPS[PinPullup.OFF]
        else:
            pullup = PULLUPS[pullup]

        pin = self.chip.get_line(offset)
        pin.bias = pullup

        config = self.io.line_request()
        config.consumer = 'pi-mqtt-gpio'

        pin.request(config)
        self.pins[offset] = pin

    def setup_interrupt(self, handle, pin, edge, callback, bouncetime=100):
        """
        install interrupt callback function
        handle:     is returned in the callback function as identification
        pin:        gpio to watch for interrupts
        edge:       triggering edge: RISING, FALLING or BOTH
        callback:   the callback function to be called, when interrupt occurs
        bouncetime: minimum time between two interrupts
        """
        edge = INTERRUPT[edge]
        offset = pin

        pin = self.chip.get_line(offset)

        config = self.io.line_request()
        config.consumer = 'pi-mqtt-gpio'
        config.request_type = edge
        
        t = Thread(target=self._event_detect, args=(pin,self.interrupt_callback,))
        t.start()

        self.watchers[offset] = t
        self.GPIO_INTERRUPT_CALLBACK_LOOKUP[offset] = {"handle": handle,
                                                    "callback": callback}

    def set_pin(self, pin, value):
        offset = pin
        self.pins[offset].set_value(value)

    def get_pin(self, pin):
        offset = pin
        return self.pins[offset].get_value()

    def cleanup(self):
        pass

    def _event_detect(self, pin, callback):
        while True:
            if pin.event_wait():
                callback()

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