C++ (Cpp) snfc_i2c_read示例

示例#1

文件： snfc_available_poll.c 项目： AbdulrahmanAmir/Dorimanx-LG-G2-D802-Kernel

/*
 * Description:
 * Input:
 * Output:
 */
static int __snfc_avail_poll_get_cen_status(void)
{
    int rc = 0;
    unsigned char read_buf = 0x00;
    int cen_status;

    rc = snfc_i2c_read(0x02, &read_buf, 1);
    if(rc)
    {
        SNFC_DEBUG_MSG("[__snfc_avail_poll_get_cen_status] snfc_i2c_read : %d \n",rc);
        return -1;
    }
    // check bit 7(locken)
    if(read_buf&0x01)
    {
        SNFC_DEBUG_MSG_LOW("[__snfc_avail_poll_get_cen_status] CEN = High (UNLOCK) \n");
        cen_status = GPIO_HIGH_VALUE;
    }
    else
    {
        SNFC_DEBUG_MSG_LOW("[__snfc_avail_poll_get_cen_status] CEN = Low (LOCK) \n");
        cen_status = GPIO_LOW_VALUE;
    }

    return cen_status;
}

示例#2

文件： snfc_cen.c 项目： adyjl/DORIMANX_LG_STOCK_LP_KERNEL

/*
 * Description:
 * Input:
 * Output:
 */
static ssize_t snfc_cen_read(struct file *fp, char *buf, size_t count, loff_t *pos)
{
    //struct snfc_i2c_dev *snfc_i2c_dev = fp->private_data;

    unsigned char read_buf = 0x00;
    char snfc_cen = -1, rc = -1;

  SNFC_DEBUG_MSG_LOW("[snfc_cen] snfc_cen_read - start \n");

/* Check error */
  if(NULL == fp || NULL == buf || 1 != count || NULL == pos)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] parameter ERROR \n");
    return -1;
  }

  mutex_lock(&nfc_cen_mutex);
  rc = snfc_i2c_read(0x02, &read_buf, 1, snfc_i2c_dev.client);
  mutex_unlock(&nfc_cen_mutex);

  if(rc)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] snfc_i2c_read : %d \n",rc);
    return -1;
  }

  // check bit 7(locken)
  if(read_buf&0x01)  // unlock
  {
    SNFC_DEBUG_MSG_MIDDLE("[snfc_cen][read] CEN = High (UNLOCK) \n");
    snfc_cen = (char)GPIO_HIGH_VALUE;
  }
  else  // lock
  {
    SNFC_DEBUG_MSG_MIDDLE("[snfc_cen][read] CEN = Low (LOCK) \n");
    snfc_cen = (char)GPIO_LOW_VALUE;
  }

  rc = copy_to_user(buf, &snfc_cen, count);
  if(rc)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] ERROR - copy_from_user \n");
    return -1;
  }

  SNFC_DEBUG_MSG_LOW("[snfc_cen][read] snfc_cen_read - end \n");

  return 1;
}

示例#3

/*
 * Description:
 * Input:
 * Output:
 */
static ssize_t snfc_cen_read(struct file *fp, char *buf, size_t count, loff_t *pos)
{
  unsigned char read_buf = 0x00;
  char snfc_cen = -1, rc = -1;

#ifdef FEATURE_DEBUG_LOW
  SNFC_DEBUG_MSG("[snfc_cen] snfc_cen_read - start \n");
#endif

/* Check error */
  if(NULL == fp)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] ERROR fp \n");
    return -1;    
  }

  if(NULL == buf)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] ERROR buf \n");
    return -1;    
  }
  
  if(1 != count)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] ERROR count, count = %d \n", count);
    //return -1;    
  }

  if(NULL == pos)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] ERROR file \n");
    //return -1;    
  }


  mutex_lock(&nfc_cen_mutex);
  rc = snfc_i2c_read(0x02, &read_buf, 1);
  mutex_unlock(&nfc_cen_mutex);

  if(rc)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] snfc_i2c_read : %d \n",rc);
    return -1;
  }

  // check bit 7(locken)
  if(read_buf&0x01)  // unlock
  {
#ifdef FEATURE_DEBUG_LOW
    SNFC_DEBUG_MSG("[snfc_cen][read] CEN = High (UNLOCK) \n");
#endif
    snfc_cen = (char)GPIO_HIGH_VALUE;
  }
  else  // lock
  {
#ifdef FEATURE_DEBUG_LOW
    SNFC_DEBUG_MSG("[snfc_cen][read] CEN = Low (LOCK) \n");
#endif
    snfc_cen = (char)GPIO_LOW_VALUE;
  }

  rc = copy_to_user(buf, &snfc_cen, count);
  if(rc)
  {
    SNFC_DEBUG_MSG("[snfc_cen][read] ERROR - copy_from_user \n");
    return -1;
  }

#ifdef FEATURE_DEBUG_LOW
  SNFC_DEBUG_MSG("[snfc_cen][read] snfc_cen_read - end \n");
#endif

  return 1;
}