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/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2016 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/dblock/oshi/graphs/contributors
*/
package oshi.util.platform.mac;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.sun.jna.ptr.IntByReference;
import oshi.jna.platform.mac.IOKit;
import oshi.jna.platform.mac.IOKit.IOConnect;
import oshi.jna.platform.mac.IOKit.SMCKeyData;
import oshi.jna.platform.mac.IOKit.SMCKeyDataKeyInfo;
import oshi.jna.platform.mac.IOKit.SMCVal;
import oshi.jna.platform.mac.SystemB;
import oshi.util.ParseUtil;
import oshi.util.Util;
/**
* Provides access to SMC calls on OS X
*
* @author widdis[at]gmail[dot]com
*/
public class SmcUtil {
private static final Logger LOG = LoggerFactory.getLogger(SmcUtil.class);
private static IOConnect conn = new IOConnect();
/**
* Map for caching info retrieved by a key necessary for subsequent calls.
*/
private static Map keyInfoCache = new HashMap();
/**
* Byte array used for matching return type
*/
private final static byte[] DATATYPE_SP78 = ParseUtil.stringToByteArray("sp78", 5);
/**
* Open a connection to SMC
*
* @return 0 if successful, nonzero if failure
*/
public static int smcOpen() {
int service = IOKitUtil.getMatchingService("AppleSMC");
if (service == 0) {
LOG.error("Error: no SMC found");
return 1;
}
int result = IOKit.INSTANCE.IOServiceOpen(service, SystemB.INSTANCE.mach_task_self(), 0, conn);
IOKit.INSTANCE.IOObjectRelease(service);
if (result != 0) {
LOG.error(String.format("Error: IOServiceOpen() = 0x%08x", result));
return result;
}
// Delay to improve success of next query
Util.sleep(5);
return 0;
}
/**
* Close connection to SMC
*
* @return 0 if successful, nonzero if failure
*/
public static int smcClose() {
return IOKit.INSTANCE.IOServiceClose(conn.getValue());
}
/**
* Get a value from SMC which is in SP78 datatype (used for Temperature)
* First bit is sign, next 7 bits are integer portion, last 8 bits are
* fractional portion
*
* @param key
* The key to retrieve
* @param retries
* Number of times to retry the key
* @return Double representing the value
*/
public static double smcGetSp78(String key, int retries) {
SMCVal val = new SMCVal();
int result = smcReadKey(key, val, retries);
if (result == 0 && val.dataSize > 0 && Arrays.equals(val.dataType, DATATYPE_SP78)) {
return val.bytes[0] + val.bytes[1] / 256d;
}
// Read failed
return 0d;
}
/**
* Get a 64-bit integer value from SMC
*
* @param key
* The key to retrieve
* @param retries
* Number of times to retry the key
* @return Long representing the value
*/
public static long smcGetLong(String key, int retries) {
SMCVal val = new SMCVal();
int result = smcReadKey(key, val, retries);
if (result == 0) {
return ParseUtil.byteArrayToLong(val.bytes, val.dataSize);
}
// Read failed
return 0;
}
/**
* Get a value from SMC which is in FPE2 datatype. First E (14) bits are
* unsigned integer portion, Last 2 bits are fractional portion
*
* @param key
* The key to retrieve
* @param retries
* Number of times to retry the key
* @return Float representing the value
*/
public static float smcGetFpe2(String key, int retries) {
SMCVal val = new SMCVal();
int result = smcReadKey(key, val, retries);
if (result == 0) {
return ParseUtil.byteArrayToFloat(val.bytes, val.dataSize, 2);
}
// Read failed
return 0f;
}
/**
* Get cached keyInfo if it exists, or generate new keyInfo
*
* @param inputStructure
* Key data input
* @param outputStructure
* Key data output
* @return 0 if successful, nonzero if failure
*/
public static int smcGetKeyInfo(SMCKeyData inputStructure, SMCKeyData outputStructure) {
if (keyInfoCache.containsKey(inputStructure.key)) {
SMCKeyDataKeyInfo keyInfo = keyInfoCache.get(inputStructure.key);
outputStructure.keyInfo.dataSize = keyInfo.dataSize;
outputStructure.keyInfo.dataType = keyInfo.dataType;
outputStructure.keyInfo.dataAttributes = keyInfo.dataAttributes;
} else {
int result = 0;
inputStructure.data8 = IOKit.SMC_CMD_READ_KEYINFO;
Util.sleep(4);
result = smcCall(IOKit.KERNEL_INDEX_SMC, inputStructure, outputStructure);
if (result != 0) {
return result;
}
SMCKeyDataKeyInfo keyInfo = new SMCKeyDataKeyInfo();
keyInfo.dataSize = outputStructure.keyInfo.dataSize;
keyInfo.dataType = outputStructure.keyInfo.dataType;
keyInfo.dataAttributes = outputStructure.keyInfo.dataAttributes;
keyInfoCache.put(inputStructure.key, keyInfo);
}
return 0;
}
/**
* Read a key from SMC
*
* @param key
* Key to read
* @param val
* Structure to receive the result
* @param retries
* Number of attempts to try
* @return 0 if successful, nonzero if failure
*/
public static int smcReadKey(String key, SMCVal val, int retries) {
SMCKeyData inputStructure = new SMCKeyData();
SMCKeyData outputStructure = new SMCKeyData();
inputStructure.key = (int) ParseUtil.strToLong(key, 4);
int result;
do {
result = smcGetKeyInfo(inputStructure, outputStructure);
if (result != 0) {
continue;
}
val.dataSize = outputStructure.keyInfo.dataSize;
val.dataType = ParseUtil.longToByteArray(outputStructure.keyInfo.dataType, 4, 5);
inputStructure.keyInfo.dataSize = val.dataSize;
inputStructure.data8 = IOKit.SMC_CMD_READ_BYTES;
Util.sleep(4);
result = smcCall(IOKit.KERNEL_INDEX_SMC, inputStructure, outputStructure);
// If we got success, exit!
if (result == 0) {
break;
}
} while (--retries > 0);
// If we errored out return code
if (result != 0) {
return result;
}
System.arraycopy(outputStructure.bytes, 0, val.bytes, 0, val.bytes.length);
// Success
return 0;
}
/**
* Call SMC
*
* @param index
* Kernel index
* @param inputStructure
* Key data input
* @param outputStructure
* Key data output
* @return 0 if successful, nonzero if failure
*/
public static int smcCall(int index, SMCKeyData inputStructure, SMCKeyData outputStructure) {
int structureInputSize = inputStructure.size();
IntByReference structureOutputSizePtr = new IntByReference(outputStructure.size());
int result = IOKit.INSTANCE.IOConnectCallStructMethod(conn.getValue(), index, inputStructure,
structureInputSize, outputStructure, structureOutputSizePtr);
if (result != 0) {
// This frequently resulted in kIOReturnIPCError in testing. TODO
// find out why!
// LOG.error(String.format("Error: IOConnectCallStructMethod() =
// 0x%08x", result));
return result;
}
// Success
return result;
}
}
