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Hendrik Holtmann
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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Copyright (C) <year> <name of author>
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Also add information on how to contact you by electronic and paper mail.
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
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library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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CC = gcc
CFLAGS = -mmacosx-version-min=10.4 -Wall -g -framework IOKit
all: smc
smc: smc.o
$(CC) $(CFLAGS) -o smc smc.o
smc.o: smc.h smc.c
$(CC) -c smc.c
clean:
-rm -f smc smc.o

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Warning
-------
This tool will allow you to write values to the SMC which could irreversably damage your
computer. Manipulating the fans could cause overheating and permanent damange. USE THIS
PROGRAM AT YOUR OWN RISK!
Background
----------
I created this program because I was unhappy with my MacBook Pro running so hot and it
annoyed me that Apple didn't make any way for end users to set fan preferences.
This program will allow you to read and write values to the SMC using the AppleSMC kernel
extension. The purpose of this is to show how to talk to the controller. I've made no
effort to make it user friendly, however I'm releasing this in hopes that someone will
take the next logical step and make a nice *free* GUI. I think it's absurd that some
people are trying to charge for simple programs to manipulate this type of data.
In my testing I've been able to lower the average system temperature by 15C just
by running the fans at a low speed like 3500 RPM, which you can barely hear.
Usage
------
# smc -h
Apple System Management Control (SMC) tool 0.01
Usage:
./smc [options]
-f : fan info decoded
-h : help
-k <key> : key to manipulate
-l : list all keys and values
-r : read the value of a key
-w <value> : write the specified value to a key
-v : version
Fan control
-----------
To decode:
# smc -f
To manually query and control:
FNum - tells you how many fans are in the system
To read data from each fan:
F0Ac - Fan actual speed
F0Mn - Fan minimum speed
F0Mx - Fan maximum speed
F0Sf - Fan safe speed
F0Tg - Fan target speed
FS! - See if fans are in automatic or forced mode
[Replace 0 with fan #. In the MacBook Pro there two fans so this applies for 0 (left)
and 1 (right).]
To set a fan to a specific speed:
FS! - Sets "force mode" to fan. Bit 0 (right to left) is fan 0, bit 1
is fan 1, etc
F0Tg - Sets target speed, make sure you fp78 encode it (left shift by 2)
For example, to force both fans to 3500 RPM:
# python -c "print hex(3500 << 2)"
0x36b0
# smc -k "FS! " -w 0003
# smc -k F0Tg -w 36b0
# smc -k F1Tg -w 36b0
..to force fan 0 to 4000 RPM and leave fan 1 in automatic mode:
# smc -k "FS! " -w 0001
# smc -k F0Tg -w 3e80
..to return both fans to automatic mode:
# smc -k "FS! " -w 0000
Temperature sensors
-------------------
TB0T
TC0D
TC0P
TM0P
TN0P
Th0H
Ts0P
TN1P
Th1H
Light sensors
-------------
ALV0 - Left
ALV1 - Right
Motion sensors
--------------
MO_X
MO_Y
MO_Z

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/*
* Apple System Management Control (SMC) Tool
* Copyright (C) 2006 devnull
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <IOKit/IOKitLib.h>
#include "smc.h"
io_connect_t conn;
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;
}
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);
}
float _strtof(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);
}
return total;
}
void smc_init(){
SMCOpen(&conn);
}
void smc_close(){
SMCClose(conn);
}
void printFPE2(SMCVal_t val)
{
/* FIXME: This decode is incomplete, last 2 bits are dropped */
printf("%.0f ", _strtof(val.bytes, val.dataSize, 2));
}
void printUInt(SMCVal_t val)
{
printf("%u ", (unsigned int) _strtoul(val.bytes, val.dataSize, 10));
}
void printBytesHex(SMCVal_t val)
{
int i;
printf("(bytes");
for (i = 0; i < val.dataSize; i++)
printf(" %02x", (unsigned char) val.bytes[i]);
printf(")\n");
}
void printVal(SMCVal_t val)
{
printf(" %-4s [%-4s] ", val.key, val.dataType);
if (val.dataSize > 0)
{
if ((strcmp(val.dataType, DATATYPE_UINT8) == 0) ||
(strcmp(val.dataType, DATATYPE_UINT16) == 0) ||
(strcmp(val.dataType, DATATYPE_UINT32) == 0))
printUInt(val);
else if (strcmp(val.dataType, DATATYPE_FPE2) == 0)
printFPE2(val);
printBytesHex(val);
}
else
{
printf("no data\n");
}
}
kern_return_t SMCOpen(io_connect_t *conn)
{
kern_return_t result;
mach_port_t masterPort;
io_iterator_t iterator;
io_object_t device;
IOMasterPort(MACH_PORT_NULL, &masterPort);
CFMutableDictionaryRef matchingDictionary = IOServiceMatching("AppleSMC");
result = IOServiceGetMatchingServices(masterPort, matchingDictionary, &iterator);
if (result != kIOReturnSuccess)
{
printf("Error: IOServiceGetMatchingServices() = %08x\n", result);
return 1;
}
device = IOIteratorNext(iterator);
IOObjectRelease(iterator);
if (device == 0)
{
printf("Error: no SMC found\n");
return 1;
}
result = IOServiceOpen(device, mach_task_self(), 0, conn);
IOObjectRelease(device);
if (result != kIOReturnSuccess)
{
printf("Error: IOServiceOpen() = %08x\n", result);
return 1;
}
return kIOReturnSuccess;
}
kern_return_t SMCClose(io_connect_t conn)
{
return IOServiceClose(conn);
}
kern_return_t SMCCall(int index, SMCKeyData_t *inputStructure, SMCKeyData_t *outputStructure)
{
size_t structureInputSize;
size_t structureOutputSize;
structureInputSize = sizeof(SMCKeyData_t);
structureOutputSize = sizeof(SMCKeyData_t);
/*
return IOConnectMethodStructureIStructureO(
conn,
index,
structureInputSize,
&structureOutputSize,
inputStructure,
outputStructure
);
*/
return IOConnectCallStructMethod(conn, index, inputStructure, structureInputSize, outputStructure, &structureOutputSize);
}
kern_return_t SMCCall2(int index, SMCKeyData_t *inputStructure, SMCKeyData_t *outputStructure,io_connect_t conn)
{
size_t structureInputSize;
size_t structureOutputSize;
structureInputSize = sizeof(SMCKeyData_t);
structureOutputSize = sizeof(SMCKeyData_t);
/* return IOConnectMethodStructureIStructureO(
conn,
index,
structureInputSize,
&structureOutputSize,
inputStructure,
outputStructure
);
*/
return IOConnectCallStructMethod(conn, index, inputStructure, structureInputSize, outputStructure, &structureOutputSize);
}
kern_return_t SMCReadKey2(UInt32Char_t key, SMCVal_t *val,io_connect_t conn)
{
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);
sprintf(val->key, key);
inputStructure.data8 = SMC_CMD_READ_KEYINFO;
result = SMCCall2(KERNEL_INDEX_SMC, &inputStructure, &outputStructure,conn);
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 = SMCCall2(KERNEL_INDEX_SMC, &inputStructure, &outputStructure,conn);
if (result != kIOReturnSuccess)
return result;
memcpy(val->bytes, outputStructure.bytes, sizeof(outputStructure.bytes));
return kIOReturnSuccess;
}
kern_return_t SMCReadKey(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);
sprintf(val->key, key);
inputStructure.data8 = SMC_CMD_READ_KEYINFO;
result = SMCCall(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(KERNEL_INDEX_SMC, &inputStructure, &outputStructure);
if (result != kIOReturnSuccess)
return result;
memcpy(val->bytes, outputStructure.bytes, sizeof(outputStructure.bytes));
return kIOReturnSuccess;
}
kern_return_t SMCWriteKey(SMCVal_t writeVal)
{
kern_return_t result;
SMCKeyData_t inputStructure;
SMCKeyData_t outputStructure;
SMCVal_t readVal;
result = SMCReadKey(writeVal.key, &readVal);
if (result != kIOReturnSuccess)
return result;
if (readVal.dataSize != writeVal.dataSize)
return kIOReturnError;
memset(&inputStructure, 0, sizeof(SMCKeyData_t));
memset(&outputStructure, 0, sizeof(SMCKeyData_t));
inputStructure.key = _strtoul(writeVal.key, 4, 16);
inputStructure.data8 = SMC_CMD_WRITE_BYTES;
inputStructure.keyInfo.dataSize = writeVal.dataSize;
memcpy(inputStructure.bytes, writeVal.bytes, sizeof(writeVal.bytes));
result = SMCCall2(KERNEL_INDEX_SMC, &inputStructure, &outputStructure,conn);
if (result != kIOReturnSuccess)
return result;
return kIOReturnSuccess;
}
kern_return_t SMCWriteKey2(SMCVal_t writeVal,io_connect_t conn)
{
kern_return_t result;
SMCKeyData_t inputStructure;
SMCKeyData_t outputStructure;
SMCVal_t readVal;
result = SMCReadKey2(writeVal.key, &readVal,conn);
if (result != kIOReturnSuccess)
return result;
if (readVal.dataSize != writeVal.dataSize)
return kIOReturnError;
memset(&inputStructure, 0, sizeof(SMCKeyData_t));
memset(&outputStructure, 0, sizeof(SMCKeyData_t));
inputStructure.key = _strtoul(writeVal.key, 4, 16);
inputStructure.data8 = SMC_CMD_WRITE_BYTES;
inputStructure.keyInfo.dataSize = writeVal.dataSize;
memcpy(inputStructure.bytes, writeVal.bytes, sizeof(writeVal.bytes));
result = SMCCall2(KERNEL_INDEX_SMC, &inputStructure, &outputStructure,conn);
if (result != kIOReturnSuccess)
return result;
return kIOReturnSuccess;
}
UInt32 SMCReadIndexCount(void)
{
SMCVal_t val;
SMCReadKey("#KEY", &val);
return _strtoul(val.bytes, val.dataSize, 10);
}
kern_return_t SMCPrintAll(void)
{
kern_return_t result;
SMCKeyData_t inputStructure;
SMCKeyData_t outputStructure;
int totalKeys, i;
UInt32Char_t key;
SMCVal_t val;
totalKeys = SMCReadIndexCount();
for (i = 0; i < totalKeys; i++)
{
memset(&inputStructure, 0, sizeof(SMCKeyData_t));
memset(&outputStructure, 0, sizeof(SMCKeyData_t));
memset(&val, 0, sizeof(SMCVal_t));
inputStructure.data8 = SMC_CMD_READ_INDEX;
inputStructure.data32 = i;
result = SMCCall(KERNEL_INDEX_SMC, &inputStructure, &outputStructure);
if (result != kIOReturnSuccess)
continue;
_ultostr(key, outputStructure.key);
SMCReadKey(key, &val);
printVal(val);
}
return kIOReturnSuccess;
}
kern_return_t SMCPrintFans(void)
{
kern_return_t result;
SMCVal_t val;
UInt32Char_t key;
int totalFans, i;
result = SMCReadKey("FNum", &val);
if (result != kIOReturnSuccess)
return kIOReturnError;
totalFans = _strtoul(val.bytes, val.dataSize, 10);
printf("Total fans in system: %d\n", totalFans);
for (i = 0; i < totalFans; i++)
{
printf("\nFan #%d:\n", i);
sprintf(key, "F%dAc", i);
SMCReadKey(key, &val);
printf(" Actual speed : %.0f\n", _strtof(val.bytes, val.dataSize, 2));
sprintf(key, "F%dMn", i);
SMCReadKey(key, &val);
printf(" Minimum speed: %.0f\n", _strtof(val.bytes, val.dataSize, 2));
sprintf(key, "F%dMx", i);
SMCReadKey(key, &val);
printf(" Maximum speed: %.0f\n", _strtof(val.bytes, val.dataSize, 2));
sprintf(key, "F%dSf", i);
SMCReadKey(key, &val);
printf(" Safe speed : %.0f\n", _strtof(val.bytes, val.dataSize, 2));
sprintf(key, "F%dTg", i);
SMCReadKey(key, &val);
printf(" Target speed : %.0f\n", _strtof(val.bytes, val.dataSize, 2));
SMCReadKey("FS! ", &val);
if ((_strtoul(val.bytes, 2, 16) & (1 << i)) == 0)
printf(" Mode : auto\n");
else
printf(" Mode : forced\n");
}
return kIOReturnSuccess;
}
void usage(char* prog)
{
printf("Apple System Management Control (SMC) tool %s\n", VERSION);
printf("Usage:\n");
printf("%s [options]\n", prog);
printf(" -f : fan info decoded\n");
printf(" -h : help\n");
printf(" -k <key> : key to manipulate\n");
printf(" -l : list all keys and values\n");
printf(" -r : read the value of a key\n");
printf(" -w <value> : write the specified value to a key\n");
printf(" -v : version\n");
printf("\n");
}
kern_return_t SMCWriteSimple(UInt32Char_t key,char *wvalue,io_connect_t conn)
{
kern_return_t result;
SMCVal_t val;
int i;
char c[3];
for (i = 0; i < strlen(wvalue); i++)
{
sprintf(c, "%c%c", wvalue[i * 2], wvalue[(i * 2) + 1]);
val.bytes[i] = (int) strtol(c, NULL, 16);
}
val.dataSize = i / 2;
sprintf(val.key, key);
result = SMCWriteKey2(val,conn);
if (result != kIOReturnSuccess)
printf("Error: SMCWriteKey() = %08x\n", result);
return result;
}
#ifdef CMD_TOOL
int main(int argc, char *argv[])
{
int c;
extern char *optarg;
kern_return_t result;
int op = OP_NONE;
UInt32Char_t key = "\0";
SMCVal_t val;
while ((c = getopt(argc, argv, "fhk:lrw:v")) != -1)
{
switch(c)
{
case 'f':
op = OP_READ_FAN;
break;
case 'k':
strncpy(key, optarg, sizeof(key)); //fix for buffer overflow
break;
case 'l':
op = OP_LIST;
break;
case 'r':
op = OP_READ;
break;
case 'v':
printf("%s\n", VERSION);
return 0;
break;
case 'w':
op = OP_WRITE;
{
int i;
char c[3];
for (i = 0; i < strlen(optarg); i++)
{
sprintf(c, "%c%c", optarg[i * 2], optarg[(i * 2) + 1]);
val.bytes[i] = (int) strtol(c, NULL, 16);
}
val.dataSize = i / 2;
if ((val.dataSize * 2) != strlen(optarg))
{
printf("Error: value is not valid\n");
return 1;
}
}
break;
case 'h':
case '?':
op = OP_NONE;
break;
}
}
if (op == OP_NONE)
{
usage(argv[0]);
return 1;
}
SMCOpen(&conn);
switch(op)
{
case OP_LIST:
result = SMCPrintAll();
if (result != kIOReturnSuccess)
printf("Error: SMCPrintAll() = %08x\n", result);
break;
case OP_READ:
if (strlen(key) > 0)
{
result = SMCReadKey(key, &val);
if (result != kIOReturnSuccess)
printf("Error: SMCReadKey() = %08x\n", result);
else
printVal(val);
}
else
{
printf("Error: specify a key to read\n");
}
break;
case OP_READ_FAN:
result = SMCPrintFans();
if (result != kIOReturnSuccess)
printf("Error: SMCPrintFans() = %08x\n", result);
break;
case OP_WRITE:
if (strlen(key) > 0)
{
sprintf(val.key, key);
result = SMCWriteKey(val);
if (result != kIOReturnSuccess)
printf("Error: SMCWriteKey() = %08x\n", result);
}
else
{
printf("Error: specify a key to write\n");
}
break;
}
SMCClose(conn);
return 0;;
}
#endif

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smc-command/smc.h Normal file
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/*
* Apple System Management Control (SMC) Tool
* Copyright (C) 2006 devnull
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef __SMC_H__
#define __SMC_H__
#endif
#define VERSION "0.01"
#define OP_NONE 0
#define OP_LIST 1
#define OP_READ 2
#define OP_READ_FAN 3
#define OP_WRITE 4
#define KERNEL_INDEX_SMC 2
#define SMC_CMD_READ_BYTES 5
#define SMC_CMD_WRITE_BYTES 6
#define SMC_CMD_READ_INDEX 8
#define SMC_CMD_READ_KEYINFO 9
#define SMC_CMD_READ_PLIMIT 11
#define SMC_CMD_READ_VERS 12
#define DATATYPE_FPE2 "fpe2"
#define DATATYPE_UINT8 "ui8 "
#define DATATYPE_UINT16 "ui16"
#define DATATYPE_UINT32 "ui32"
typedef struct {
char major;
char minor;
char build;
char reserved[1];
UInt16 release;
} SMCKeyData_vers_t;
typedef struct {
UInt16 version;
UInt16 length;
UInt32 cpuPLimit;
UInt32 gpuPLimit;
UInt32 memPLimit;
} SMCKeyData_pLimitData_t;
typedef struct {
UInt32 dataSize;
UInt32 dataType;
char dataAttributes;
} SMCKeyData_keyInfo_t;
typedef char SMCBytes_t[32];
typedef struct {
UInt32 key;
SMCKeyData_vers_t vers;
SMCKeyData_pLimitData_t pLimitData;
SMCKeyData_keyInfo_t keyInfo;
char result;
char status;
char data8;
UInt32 data32;
SMCBytes_t bytes;
} SMCKeyData_t;
typedef char UInt32Char_t[5];
typedef struct {
UInt32Char_t key;
UInt32 dataSize;
UInt32Char_t dataType;
SMCBytes_t bytes;
} SMCVal_t;
UInt32 _strtoul(char *str, int size, int base);
kern_return_t SMCOpen(io_connect_t *conn);
kern_return_t SMCReadKey(UInt32Char_t key, SMCVal_t *val);
kern_return_t SMCReadKey2(UInt32Char_t key, SMCVal_t *val,io_connect_t conn);
kern_return_t SMCWriteSimple(UInt32Char_t key,char *wvalue,io_connect_t conn);
kern_return_t SMCClose(io_connect_t conn);
void smc_init();
void smc_close();
float _strtof(char *str, int size, int e);