/****************************************************************************
 * system/mdio/mdio_main.c
 *
 *   Copyright (C) 2014 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 <stdio.h>
#include <stdlib.h>

#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>

#include <net/if.h>
#include <arpa/inet.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

#define CONFIG_HELLO_IPADDR     0xc0a8eacd
#define CONFIG_HELLO_PORT       81

/****************************************************************************
 * Private Data
 ****************************************************************************/

/* Socket related variables */

static int g_listen_fd;

static struct sockaddr_in g_sa;

int initialize_socket(void)
{
  /* Prepare listen address */

  g_sa.sin_family      = AF_INET;
  g_sa.sin_port        = HTONS(CONFIG_HELLO_PORT);
  g_sa.sin_addr.s_addr = HTONL(CONFIG_HELLO_IPADDR);

  /* Open listening socket */

  g_listen_fd = socket(g_sa.sin_family, SOCK_DGRAM, 0);

  /* Verify socket creation */

  if (!(g_listen_fd > 0))
    {
      return -1;
    }

  return 0;
}

int get_phy_id(void)
{
  int ret;
  uint16_t phy_id;
  struct ifreq ifr;

  /* Prepare ifreq */

  strncpy(ifr.ifr_name, "eth0", IFNAMSIZ);

  ret = ioctl(g_listen_fd, SIOCGMIIPHY, (unsigned long) &ifr);

  printf("call to %s() ", "ioctl");

  if (ret != 0)
    {
      printf("failed! (value %d, errno %d)\n", ret, errno);
      return -1;
    }

  phy_id = ifr.ifr_mii_phy_id;

  return phy_id;
}

int get_phy_reg(uint16_t phy_id, uint16_t reg_num, uint16_t *val)
{
  int ret;
  struct ifreq ifr;

  strncpy(ifr.ifr_name, "eth0", IFNAMSIZ);

  ifr.ifr_mii_phy_id = phy_id;
  ifr.ifr_mii_reg_num = reg_num;

  ret = ioctl(g_listen_fd, SIOCGMIIREG, (unsigned long) &ifr);

  if(ret == OK)
    {
      *val = ifr.ifr_mii_val_out;
    }

  return ret;
}

int set_phy_reg(uint16_t phy_id, uint16_t reg_num, uint16_t val)
{
  int ret;
  struct ifreq ifr;

  strncpy(ifr.ifr_name, "eth0", IFNAMSIZ);

  ifr.ifr_mii_phy_id = phy_id;
  ifr.ifr_mii_reg_num = reg_num;
  ifr.ifr_mii_val_in = val;

  ret = ioctl(g_listen_fd, SIOCSMIIREG, (unsigned long) &ifr);

  return ret;
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * mdio_main
 ****************************************************************************/

int main(int argc, FAR char *argv[])
{
  int ret;
  int i;

  /* test related */

  uint16_t phy_id;
  uint16_t reg_num;
  uint16_t val_in;
  uint16_t val_out;

  /*--- SETUP --------------------------------------------------------------*/

  if (argc == 1)
    {
      printf("usage:\n");
      printf("\n");
      printf("  %s phy_id reg_no          -- read register\n", argv[0]);
      printf("  %s phy_id reg_no value    -- write register\n", argv[0]);
      printf("\n");
      return -1;
    }

  initialize_socket();

  if (argc == 4) /* Write to register */
    {
      phy_id = strtol(argv[1], NULL, 16);
      reg_num = strtol(argv[2], NULL, 16);
      val_in = strtol(argv[3], NULL, 16);

      ret = set_phy_reg(phy_id, reg_num, val_in);
      if (ret != 0)
        {
          printf("%s() returned %d\n", "set_phy_reg", ret);
        }
    }
  else if (argc == 3) /* Read from register */
    {
      phy_id = strtol(argv[1], NULL, 16);
      reg_num = strtol(argv[2], NULL, 16);

      ret = get_phy_reg(phy_id, reg_num, &val_out);
      if (ret != 0)
        {
          printf("%s() returned %d\n", "get_phy_reg", ret);
        }
      else
        {
          printf("0x%4x\n", val_out);
        }
    }
  else if (argc == 2)
    {
      phy_id = strtol(argv[1], NULL, 16);

      for (i = 0; i < 32; i++)
        {
          (void)get_phy_reg(phy_id, i, &val_out);
          printf("phy[%d][%d] = 0x%4x\n", phy_id, i, val_out);
        }
    }
  else
    {
      /* Read the PHY address */

      phy_id = get_phy_id();

      if (phy_id < 1)
        {
          /* failed (can not be negative) */

          printf("getting phy id failed\n");
        }
      else
        {
          printf("phy_id = %d\n", phy_id);
        }
    }

  return 0;
}