text: /****************************************************************************
   * boards/arm/stm32/stm32f103-minimum/src/stm32_at24.c
   *
   *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <stdbool.h>
  #include <stdio.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/i2c/i2c_master.h>
  #include <nuttx/mtd/mtd.h>
  #include <nuttx/fs/fs.h>
  #include <nuttx/fs/nxffs.h>
  
  #include "stm32_i2c.h"
  #include "stm32f103_minimum.h"
  
  #ifdef HAVE_AT24
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: stm32_at24_automount
   *
   * Description:
   *   Initialize and configure the AT24 serial EEPROM
   *
   ****************************************************************************/
  
  int stm32_at24_automount(int minor)
  {
    FAR struct i2c_master_s *i2c;
    FAR struct mtd_dev_s *mtd;
    static bool initialized = false;
    int ret;
  
    /* Have we already initialized? */
  
    if (!initialized)
      {
        /* No.. Get the I2C bus driver */
  
        finfo("Initialize I2C%d\n", AT24_I2C_BUS);
        i2c = stm32_i2cbus_initialize(AT24_I2C_BUS);
        if (!i2c)
          {
            ferr("ERROR: Failed to initialize I2C%d\n", AT24_I2C_BUS);
            return -ENODEV;
          }
  
        /* Now bind the I2C interface to the AT24 I2C EEPROM driver */
  
        finfo("Bind the AT24 EEPROM driver to I2C%d\n", AT24_I2C_BUS);
        mtd = at24c_initialize(i2c);
        if (!mtd)
          {
            ferr("ERROR: Failed to bind TWI%d to the AT24 EEPROM driver\n",
                 AT24_I2C_BUS);
            return -ENODEV;
          }
  
  #if defined(CONFIG_STM32F103MINIMUM_AT24_FTL)
        /* And use the FTL layer to wrap the MTD driver as a block driver */
  
        finfo("Initialize the FTL layer to create /dev/mtdblock%d\n",
              AT24_MINOR);
        ret = ftl_initialize(AT24_MINOR, mtd);
        if (ret < 0)
          {
            ferr("ERROR: Failed to initialize the FTL layer: %d\n", ret);
            return ret;
          }
  
  #elif defined(CONFIG_STM32F103MINIMUM_AT24_NXFFS)
        /* Initialize to provide NXFFS on the MTD interface */
  
        finfo("Initialize the NXFFS file system\n");
        ret = nxffs_initialize(mtd);
        if (ret < 0)
          {
            ferr("ERROR: NXFFS initialization failed: %d\n", ret);
            return ret;
          }
  
        /* Mount the file system at /mnt/at24 */
  
        finfo("Mount the NXFFS file system at /dev/at24\n");
        ret = nx_mount(NULL, "/mnt/at24", "nxffs", 0, NULL);
        if (ret < 0)
          {
            ferr("ERROR: Failed to mount the NXFFS volume: %d\n", ret);
            return ret;
          }
  #endif
  
        /* Now we are initialized */
  
        initialized = true;
      }
  
    return OK;
  }
  
  #endif /* HAVE_AT24 */
  