Skip to content

Instantly share code, notes, and snippets.

@edvakf edvakf/smc.c
Created Nov 10, 2012

Embed
What would you like to do?
SMC
/*
* 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"
static 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 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;
result = 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)
{
#if __LP64__
size_t structureInputSize;
size_t structureOutputSize;
#else
IOItemCount structureInputSize;
IOByteCount structureOutputSize;
#endif
structureInputSize = sizeof(SMCKeyData_t);
structureOutputSize = sizeof(SMCKeyData_t);
#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
return IOConnectCallStructMethod(
conn,
index,
inputStructure,
structureInputSize,
outputStructure,
&structureOutputSize
);
#else
return IOConnectMethodStructureIStructureO(
conn,
index,
structureInputSize,
&structureOutputSize,
inputStructure,
outputStructure
);
#endif
}
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);
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 = SMCCall(KERNEL_INDEX_SMC, &inputStructure, &outputStructure);
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);
result = 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");
double temp;
temp = SMCGetTemperature(SMC_KEY_CPU_TEMP);
printf(" Temp = %g\n", temp);
temp = SMCGetTemperature("TB0T");
printf(" Temp TB0T = %g\n", temp);
temp = SMCGetTemperature("TC0D");
printf(" Temp TC0D = %g\n", temp);
temp = SMCGetTemperature("TC0P");
printf(" Temp TC0P = %g\n", temp);
temp = SMCGetTemperature("TM0P");
printf(" Temp TM0P = %g\n", temp);
temp = SMCGetTemperature("TN0P");
printf(" Temp TN0P = %g\n", temp);
temp = SMCGetTemperature("Th0H");
printf(" Temp Th0H = %g\n", temp);
temp = SMCGetTemperature("Ts0P");
printf(" Temp Ts0P = %g\n", temp);
temp = SMCGetTemperature("TN1P");
printf(" Temp TN1P = %g\n", temp);
temp = SMCGetTemperature("Th1H");
printf(" Temp Th1H = %g\n", temp);
}
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");
}
double SMCGetTemperature(char *key)
{
SMCVal_t val;
kern_return_t result;
result = SMCReadKey(key, &val);
if (result == kIOReturnSuccess) {
// read succeeded - check returned value
if (val.dataSize > 0) {
if (strcmp(val.dataType, DATATYPE_SP78) == 0) {
// convert fp78 value to temperature
int intValue = (val.bytes[0] * 256 + val.bytes[1]) >> 2;
return intValue / 64.0;
}
}
}
// read failed
return 0.0;
}
kern_return_t SMCSetFanRpm(char *key, int rpm)
{
SMCVal_t val;
strcpy(val.key, key);
val.bytes[0] = (rpm << 2) / 256;
val.bytes[1] = (rpm << 2) % 256;
val.dataSize = 2;
return SMCWriteKey(val);
}
int SMCGetFanRpm(char *key)
{
SMCVal_t val;
kern_return_t result;
result = SMCReadKey(key, &val);
if (result == kIOReturnSuccess) {
// read succeeded - check returned value
if (val.dataSize > 0) {
if (strcmp(val.dataType, DATATYPE_FPE2) == 0) {
// convert FPE2 value to int value
return (int)_strtof(val.bytes, val.dataSize, 2);
}
}
}
// read failed
return -1;
}
int main(int argc, char *argv[])
{
int c;
extern char *optarg;
extern int optind, optopt, opterr;
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':
if (strlen(optarg) > sizeof(UInt32Char_t)) {
memcpy(key, optarg, sizeof(UInt32Char_t));
} else {
memcpy(key, optarg, strlen(optarg));
}
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)
{
memcpy(val.key, key, strlen(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;;
}
/*
* 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_2"
#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"
#define DATATYPE_SP78 "sp78"
// key values
#define SMC_KEY_CPU_TEMP "TC0D"
#define SMC_KEY_FAN0_RPM_MIN "F0Mn"
#define SMC_KEY_FAN1_RPM_MIN "F1Mn"
#define SMC_KEY_FAN0_RPM_CUR "F0Ac"
#define SMC_KEY_FAN1_RPM_CUR "F1Ac"
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;
// prototypes
double SMCGetTemperature(char *key);
kern_return_t SMCSetFanRpm(char *key, int rpm);
int SMCGetFanRpm(char *key);
@edvakf

This comment has been minimized.

Copy link
Owner Author

edvakf commented Nov 10, 2012

Redistribution of source code included in "ClamNF.app v5.5.5 for Mac OS X 10.5.8 (12/5/2011)" found here http://www.geocities.jp/freeggggroup/nf/

build with command:

clang -framework IOKit -o smc smc.c

usage:

$ ./smc -h
Apple System Management Control (SMC) tool 0.01_2
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
$ ./smc -f
Total fans in system: 1

Fan #0:
    Actual speed : 1997
    Minimum speed: 2000
    Maximum speed: 6500
    Safe speed   : 0
    Target speed : 2000
    Mode         : auto
    Temp         = 55.375
    Temp TB0T        = 32.6875
    Temp TC0D        = 55.375
    Temp TC0P        = 50.5
    Temp TM0P        = 46.875
    Temp TN0P        = 0
    Temp Th0H        = 0
    Temp Ts0P        = 30.625
    Temp TN1P        = 0
    Temp Th1H        = 35.375
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.