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/*
* Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Interface to SMC API, needed in order to collect sensors stats.
*/
#include <stdio.h>
#include <string.h>
#include <IOKit/IOKitLib.h>
#include "smc.h"
UInt32 _strtoul(char *str, int size, int base)
{
UInt32 total = 0;
int i;
for (i = 0; i < size; i++) {
if (base == 16)
total += str[i] << (size - 1 - i) * 8;
else
total += (unsigned char) (str[i] << (size - 1 - i) * 8);
}
return total;
}
float _strtof(unsigned char *str, int size, int e)
{
float total = 0;
int i;
for (i = 0; i < size; i++) {
if (i == (size - 1))
total += (str[i] & 0xff) >> e;
else
total += str[i] << (size - 1 - i) * (8 - e);
}
total += (str[size-1] & 0x03) * 0.25;
return total;
}
void _ultostr(char *str, UInt32 val)
{
str[0] = '\0';
sprintf(str, "%c%c%c%c",
(unsigned int) val >> 24,
(unsigned int) val >> 16,
(unsigned int) val >> 8,
(unsigned int) val);
}
kern_return_t SMCOpen(io_connect_t * pconn)
{
kern_return_t result;
io_iterator_t iterator;
io_object_t device;
CFMutableDictionaryRef matchingDictionary = IOServiceMatching("AppleSMC");
result = IOServiceGetMatchingServices(
kIOMasterPortDefault,
matchingDictionary,
&iterator
);
if (result != kIOReturnSuccess) {
return 1;
}
device = IOIteratorNext(iterator);
IOObjectRelease(iterator);
if (device == 0) {
return 1;
}
result = IOServiceOpen(device, mach_task_self(), 0, pconn);
IOObjectRelease(device);
if (result != kIOReturnSuccess) {
return 1;
}
return kIOReturnSuccess;
}
kern_return_t SMCClose(io_connect_t conn)
{
return IOServiceClose(conn);
}
kern_return_t SMCCall(io_connect_t conn,
int index, SMCKeyData_t *inputStructure, SMCKeyData_t *outputStructure)
{
size_t structureInputSize;
size_t structureOutputSize;
structureInputSize = sizeof(SMCKeyData_t);
structureOutputSize = sizeof(SMCKeyData_t);
return IOConnectCallStructMethod(
conn, index, inputStructure, structureInputSize, outputStructure,
&structureOutputSize);
}
kern_return_t SMCReadKey(io_connect_t conn, UInt32Char_t key, SMCVal_t *val) {
kern_return_t result;
SMCKeyData_t inputStructure;
SMCKeyData_t outputStructure;
memset(&inputStructure, 0, sizeof(SMCKeyData_t));
memset(&outputStructure, 0, sizeof(SMCKeyData_t));
memset(val, 0, sizeof(SMCVal_t));
inputStructure.key = _strtoul(key, 4, 16);
inputStructure.data8 = SMC_CMD_READ_KEYINFO;
result = SMCCall(
conn,
KERNEL_INDEX_SMC,
&inputStructure,
&outputStructure
);
if (result != kIOReturnSuccess)
return result;
val->dataSize = outputStructure.keyInfo.dataSize;
_ultostr(val->dataType, outputStructure.keyInfo.dataType);
inputStructure.keyInfo.dataSize = val->dataSize;
inputStructure.data8 = SMC_CMD_READ_BYTES;
result = SMCCall(
conn,
KERNEL_INDEX_SMC,
&inputStructure,
&outputStructure
);
if (result != kIOReturnSuccess)
return result;
memcpy(val->bytes, outputStructure.bytes, sizeof(outputStructure.bytes));
return kIOReturnSuccess;
}
double SMCGetTemperature(io_connect_t conn, char *key) {
SMCVal_t val;
int intValue;
kern_return_t result;
result = SMCReadKey(conn, key, &val);
if (result == kIOReturnSuccess) {
if (val.dataSize > 0) {
if (strcmp(val.dataType, DATATYPE_SP78) == 0) {
intValue = val.bytes[0] * 256 + (unsigned char)val.bytes[1];
return intValue / 256.0;
}
}
}
return 0.0;
}
float SMCGetFanSpeed(int fanNum)
{
SMCVal_t val;
kern_return_t result;
UInt32Char_t key;
io_connect_t conn;
result = SMCOpen(&conn);
if (result != kIOReturnSuccess) {
return -1;
}
sprintf(key, SMC_KEY_FAN_SPEED, fanNum);
result = SMCReadKey(conn, key, &val);
if (result != kIOReturnSuccess) {
SMCClose(conn);
return -1;
}
SMCClose(conn);
return _strtof((unsigned char *)val.bytes, val.dataSize, 2);
}
int SMCGetFanNumber(char *key)
{
SMCVal_t val;
kern_return_t result;
io_connect_t conn;
result = SMCOpen(&conn);
if (result != kIOReturnSuccess) {
return 0;
}
result = SMCReadKey(conn, key, &val);
if (result != kIOReturnSuccess) {
SMCClose(conn);
return 0;
}
SMCClose(conn);
return _strtoul((char *)val.bytes, val.dataSize, 10);
}
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