LinuxQuestions.org - About errno:70, writing data to Fm1188 voice chip

Hi friends,
I try to write to a voice processesor,

The i2c-2 device open succesfully, and Slave adress set successfully
But "write" returns -1 value and I get errno:70(Commnication error on send)

Anyone have detailed information about Errno:70, what caused errno:70? I couldnt find useful info yet about it.

Part of my code below:

Code:

JNIEXPORT jint JNICALL Java_com_I2CInterface_i2cwrite

  (JNIEnv * env, jclass jc, jintArray data)

{

  jint rc = -1;



  jint *buffer = (*env)->GetByteArrayElements(env, data, NULL);



  if (NULL == buffer)

  {

      LOGE("Buffer empty");

      return 0;

  }

  // Get data length

  jsize data_len = (*env)->GetArrayLength(env, data);

  LOGI("data_len = %d", data_len);



  // i2c-dev open

  int fd = open("/dev/i2c-2", O_RDWR);

  LOGI("fd return value = %d",fd);



  if(fd > 0)

  {  

int SLAVEADDR=0x60;

int in=ioctl(fd, I2C_SLAVE_FORCE, SLAVEADDR);

LOGI("IOCTL value: %d",in);



      if( in < 0)

      {

            char* error_str = strerror(errno);

        LOGE("Slave Address could not set, errno = %d (%s)", errno, error_str);

        goto _error;



      }

// writing data

int mq=write(fd, buffer, data_len);

LOGI("Write retun value: %d",mq);

    

    if(mq != data_len)

    {

    char* error_str = strerror(errno);

    LOGE("Couldnt write data!, errno = %d (%s)", errno, error_str);

    goto _error;

    }



      LOGI("Data write succesfully \n");

    

      rc = 0;



  _error:

      close(fd);

  }

  else

  {

      char* error_str = strerror(errno);

      LOGE("i2c device couldnt open-> I2C port 1, errno = %d (%s)", errno, error_str);

  }



  return (rc);

}