kern_return_t SMCWriteKey(io_connect_t conn, const SMCVal_t *val)
{
SMCVal_t readVal;
IOReturn result = SMCReadKey(conn, val->key, &readVal);
if (result != kIOReturnSuccess)
return result;
if (readVal.dataSize != val->dataSize)
return kIOReturnError;
return SMCWriteKeyUnsafe(conn, val);
}
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;
}
}
}
IoObject *IoAppleSensors_getRAMTemperature(IoAppleSensors *self, IoObject *locals, IoMessage *m)
{
/*doc AppleSensors getRAMTemperature
Returns a number for the RAM temperature sensor.
*/
SMCVal_t val = createEmptyValue();
char cStr[16];
kern_return_t result = SMCReadKey("TM0P", &val);
if (result == kIOReturnSuccess) {
result = representValue(val, &cStr[0]);
if (result == TRUE) {
float ftemp = atof(&cStr[0]);
return IONUMBER(ftemp);
}
}
return IONUMBER(-127);
}