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   1 /**
   2  * Copyright (c) 2010-2022 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.mcp23017.internal.handler;
  14
  15 import static org.openhab.binding.mcp23017.internal.Mcp23017BindingConstants.DEFAULT_STATE;
  16
  17 import java.util.HashMap;
  18 import java.util.Map;
  19 import java.util.Map.Entry;
  20 import java.util.Optional;
  21
  22 import org.openhab.binding.mcp23017.internal.GPIODataHolder;
  23 import org.openhab.binding.mcp23017.internal.PinMapper;
  24 import org.openhab.core.config.core.Configuration;
  25 import org.openhab.core.thing.ChannelUID;
  26 import org.openhab.core.thing.Thing;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 import com.pi4j.gpio.extension.mcp.MCP23017GpioProvider;
  31 import com.pi4j.io.gpio.GpioPin;
  32 import com.pi4j.io.gpio.GpioPinDigitalInput;
  33 import com.pi4j.io.gpio.GpioPinDigitalOutput;
  34 import com.pi4j.io.gpio.Pin;
  35 import com.pi4j.io.gpio.PinState;
  36
  37 /**
  38  * The {@link Mcp23017PinStateHolder} is a class where MCP23017 PIN state is held
  39  *
  40  * @author Anatol Ogorek - Initial contribution
  41  */
  42 public class Mcp23017PinStateHolder {
  43
  44     private final Logger logger = LoggerFactory.getLogger(getClass());
  45     private Map<ChannelUID, GpioPinDigitalInput> inputPins = new HashMap<>();
  46     private Map<ChannelUID, GpioPinDigitalOutput> outputPins = new HashMap<>();
  47     private MCP23017GpioProvider mcpProvider;
  48     private Thing thing;
  49
  50     public Mcp23017PinStateHolder(MCP23017GpioProvider mcpProvider, Thing thing) {
  51         this.mcpProvider = mcpProvider;
  52         this.thing = thing;
  53     }
  54
  55     public GpioPin getInputPin(ChannelUID channel) {
  56         return inputPins.get(channel);
  57     }
  58
  59     public GpioPinDigitalOutput getOutputPin(ChannelUID channel) {
  60         logger.debug("Getting output pin for channel {}", channel);
  61         GpioPinDigitalOutput outputPin = outputPins.get(channel);
  62         if (outputPin == null) {
  63             outputPin = initializeOutputPin(channel);
  64             outputPins.put(channel, outputPin);
  65         }
  66         return outputPin;
  67     }
  68
  69     private GpioPinDigitalOutput initializeOutputPin(ChannelUID channel) {
  70         Pin pin = PinMapper.get(channel.getIdWithoutGroup());
  71         logger.debug("initializeOutputPin for channel {}", channel);
  72         Configuration configuration = thing.getChannel(channel.getId()).getConfiguration();
  73         PinState pinState = PinState.valueOf((String) configuration.get(DEFAULT_STATE));
  74         logger.debug("initializing for pinState {}", pinState);
  75         GpioPinDigitalOutput gpioPin = GPIODataHolder.GPIO.provisionDigitalOutputPin(mcpProvider, pin,
  76                 channel.getIdWithoutGroup(), pinState);
  77         logger.debug("Bound digital output for PIN: {}, channel: {}, pinState: {}", pin, channel, pinState);
  78         return gpioPin;
  79     }
  80
  81     public void unBindGpioPins() {
  82         inputPins.values().stream().forEach(gpioPin -> GPIODataHolder.GPIO.unprovisionPin(gpioPin));
  83         inputPins.clear();
  84
  85         outputPins.values().stream().forEach(gpioPin -> GPIODataHolder.GPIO.unprovisionPin(gpioPin));
  86         outputPins.clear();
  87     }
  88
  89     public ChannelUID getChannelForInputPin(GpioPinDigitalInput pin) {
  90         Optional<Entry<ChannelUID, GpioPinDigitalInput>> result = inputPins.entrySet().stream()
  91                 .filter(entry -> entry.getValue().equals(pin)).findFirst();
  92         if (result.isPresent()) {
  93             return result.get().getKey();
  94         }
  95         return null;
  96     }
  97
  98     public void addInputPin(GpioPinDigitalInput pin, ChannelUID channel) {
  99         inputPins.put(channel, pin);
 100     }
 101 }