BMIDevice.java

package com.buglabs.bug.sysfs;

import java.io.File;
import java.io.IOException;

/**
 * A for properties associated with a BMI module attached to
 * BUG.  This class is designed to be subclassed for specific modules.
 * 
 * @author kgilmer
 * 
 */
public class BMIDevice extends SysfsNode {
	private static final String SUSPEND_FILENAME = "suspend";
	
	private String description;
	private int gpio_usage;
	private int power_use;
	private int revision;
	private int vendor;
	private int bus_usage;
	private int memory_size;
	private int power_charging;
	private String product_id;
	private String serial_num;
	private final int slot;
	private int gpioUsage;
	private int powerUse;
	private int busUsage;
	private int memorySize;
	private int powerCharging;
	private String serialNum;
	
	public BMIDevice(File root, int slot) {
		super(root);
		this.slot = slot;
		this.description = getFirstLineofFile(new File(root, "description"));
		this.gpioUsage = parseInt(getFirstLineofFile(new File(root, "gpio_usage")));
		this.powerUse = parseInt(getFirstLineofFile(new File(root, "power_use")));
		this.revision = parseInt(getFirstLineofFile(new File(root, "revision")));
		this.vendor = parseInt(getFirstLineofFile(new File(root, "vendor")));
		this.busUsage = parseInt(getFirstLineofFile(new File(root, "bus_usage")));
		this.memorySize = parseInt(getFirstLineofFile(new File(root, "memory_size")));
		this.powerCharging = parseInt(getFirstLineofFile(new File(root, "power_charging")));
		this.product_id = parseHexInt(getFirstLineofFile(new File(root, "product")));
		this.serialNum = parseMultiInt(getFirstLineofFile(new File(root, "serial_num")));
	}

	/**
	 * Create an instance of BMIModuleProperties class using the base BMI /sys
	 * filesystem directory, for example /sys/devices/conn-m1.
	 * 
	 * @param directory
	 * @param slot 
	 * @return
	 * @throws IOException if the root directory is not valid and readable.
	 */
	protected static BMIDevice createFromSYSDirectory(File directory, int slot) {
		if (directory == null || !directory.exists() || !directory.isDirectory()) {
			return null;
		}
		
		String productId = parseHexInt(getFirstLineofFile(new File(directory, "product")));

		if (productId.equals("000F")) {
			return new CameraDevice(directory, slot);
		} 
		
		if (productId.equals("000D")) {
			return new VideoOutDevice(directory, slot);
		} 
		
		return new BMIDevice(directory, slot);
	}
	
	public int getSlot() {
		return slot;
	}

	public String getDescription() {
		return description;
	}

	public int getGpioUsage() {
		return gpio_usage;
	}

	public int getPowerUse() {
		return power_use;
	}

	public int getRevision() {
		return revision;
	}

	public int getVendor() {
		return vendor;
	}

	public int getBusUsage() {
		return bus_usage;
	}

	public int getMemorySize() {
		return memory_size;
	}

	public int getPowerCharging() {
		return power_charging;
	}

	public String getProductId() {
		return product_id;
	}

	public String getSerialNum() {
		return serial_num;
	}
	
	public boolean suspend() {
		try {
			println(new File(root, SUSPEND_FILENAME), "1");
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		}
		return true;
	}
	
	public boolean resume() {
		try {
			println(new File(root, SUSPEND_FILENAME), "0");
		} catch (IOException e) {
			e.printStackTrace();
			return false;
		}
		return true;
	}
}