001package com.pi4j.io.i2c.impl; 002 003/* 004 * #%L 005 * ********************************************************************** 006 * ORGANIZATION : Pi4J 007 * PROJECT : Pi4J :: Java Library (Core) 008 * FILENAME : I2CProviderImpl.java 009 * 010 * This file is part of the Pi4J project. More information about 011 * this project can be found here: https://www.pi4j.com/ 012 * ********************************************************************** 013 * %% 014 * Copyright (C) 2012 - 2019 Pi4J 015 * %% 016 * This program is free software: you can redistribute it and/or modify 017 * it under the terms of the GNU Lesser General Public License as 018 * published by the Free Software Foundation, either version 3 of the 019 * License, or (at your option) any later version. 020 * 021 * This program is distributed in the hope that it will be useful, 022 * but WITHOUT ANY WARRANTY; without even the implied warranty of 023 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 024 * GNU General Lesser Public License for more details. 025 * 026 * You should have received a copy of the GNU General Lesser Public 027 * License along with this program. If not, see 028 * <http://www.gnu.org/licenses/lgpl-3.0.html>. 029 * #L% 030 */ 031 032import java.io.File; 033import java.io.IOException; 034 035import java.util.concurrent.TimeUnit; 036 037import com.pi4j.io.i2c.I2CBus; 038import com.pi4j.io.i2c.I2CFactory.UnsupportedBusNumberException; 039import com.pi4j.io.i2c.I2CFactoryProvider; 040 041public class I2CProviderImpl implements I2CFactoryProvider { 042 043 public I2CProviderImpl() { 044 } 045 046 public I2CBus getBus(final int busNumber, final long lockAquireTimeout, final TimeUnit lockAquireTimeoutUnit) throws UnsupportedBusNumberException, IOException { 047 final File sysfs = new File("/sys/bus/i2c/devices/i2c-" + busNumber); 048 if (!sysfs.exists() || !sysfs.isDirectory()) { 049 throw new UnsupportedBusNumberException(); 050 } 051 052 final File devfs = new File("/dev/i2c-" + busNumber); 053 if (!devfs.exists() || !devfs.canRead() || !devfs.canWrite()) { 054 throw new UnsupportedBusNumberException(); 055 } 056 057 I2CBusImpl result = new I2CBusImpl(busNumber, devfs.getCanonicalPath(), lockAquireTimeout, lockAquireTimeoutUnit); 058 result.open(); 059 060 return result; 061 } 062}