/****************************************************************************
 * arch/drivers/analog/dac7554.c
 *
 *   Copyright (C) 2010, 2016, 2018 Gregory Nutt. All rights reserved.
 *   Copyright (C) 2018 Daniel P. Carvalho. All rights reserved.
 *   Copyright (C) 2019 Augusto Fraga Giachero. All rights reserved.
 *   Author:  Augusto Fraga Giachero <afg@augustofg.net>
 *
 * This file is a part of NuttX:
 *
 *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
 *
 * 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 <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <errno.h>
#include <debug.h>

#include <nuttx/kmalloc.h>
#include <nuttx/arch.h>
#include <nuttx/analog/dac.h>
#include <nuttx/spi/spi.h>

/****************************************************************************
 * Preprocessor definitions
 ****************************************************************************/

#if !defined(CONFIG_SPI)
#  error SPI Support Required.
#endif

#if defined(CONFIG_DAC7554)

#ifndef CONFIG_DAC7554_SPI_FREQUENCY
#  define CONFIG_DAC7554_SPI_FREQUENCY 1000000
#endif

#define DAC7554_SPI_MODE (SPIDEV_MODE2) /* SPI Mode 2: CPOL=1,CPHA=0 */

/****************************************************************************
 * Private Types
 ****************************************************************************/

struct dac7554_dev_s
{
  FAR struct spi_dev_s *spi;  /* SPI interface */
  int spidev;                 /* SPI Chip Select number */
};

/****************************************************************************
 * Private Function Prototypes
 ****************************************************************************/

/* I2C Helpers */

/* DAC methods */

static void dac7554_reset(FAR struct dac_dev_s *dev);
static int  dac7554_setup(FAR struct dac_dev_s *dev);
static void dac7554_shutdown(FAR struct dac_dev_s *dev);
static void dac7554_txint(FAR struct dac_dev_s *dev, bool enable);
static int  dac7554_send(FAR struct dac_dev_s *dev,
              FAR struct dac_msg_s *msg);
static int  dac7554_ioctl(FAR struct dac_dev_s *dev, int cmd,
              unsigned long arg);

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

static const struct dac_ops_s g_dacops =
{
  .ao_reset    = dac7554_reset,
  .ao_setup    = dac7554_setup,
  .ao_shutdown = dac7554_shutdown,
  .ao_txint    = dac7554_txint,
  .ao_send     = dac7554_send,
  .ao_ioctl    = dac7554_ioctl,
};

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: dac7554_configspi
 *
 * Description:
 *   Configure the SPI interface
 *
 ****************************************************************************/

static inline void dac7554_configspi(FAR struct spi_dev_s *spi)
{
  SPI_SETMODE(spi, DAC7554_SPI_MODE);
  SPI_SETBITS(spi, 8);
  SPI_HWFEATURES(spi, 0);
  SPI_SETFREQUENCY(spi, CONFIG_DAC7554_SPI_FREQUENCY);
}

/****************************************************************************
 * Name: dac7554_reset
 *
 * Description:
 *   Reset the DAC device. Called early to initialize the hardware. This
 *   is called, before ao_setup() and on error conditions.
 *
 ****************************************************************************/

static void dac7554_reset(FAR struct dac_dev_s *dev)
{
}

/****************************************************************************
 * Name: dac7554_setup
 *
 * Description:
 *   Configure the DAC. This method is called the first time that the DAC
 *   device is opened.  This will occur when the port is first opened.
 *   This setup includes configuring and attaching DAC interrupts.  Interrupts
 *   are all disabled upon return.
 *
 ****************************************************************************/

static int  dac7554_setup(FAR struct dac_dev_s *dev)
{
  return OK;
}

/****************************************************************************
 * Name: dac7554_shutdown
 *
 * Description:
 *   Disable the DAC. This method is called when the DAC device is closed.
 *   This method reverses the operation the setup method.
 *
 ****************************************************************************/

static void dac7554_shutdown(FAR struct dac_dev_s *dev)
{
}

/****************************************************************************
 * Name: dac7554_txint
 *
 * Description:
 *   Call to enable or disable TX interrupts
 *
 ****************************************************************************/

static void dac7554_txint(FAR struct dac_dev_s *dev, bool enable)
{
}

/****************************************************************************
 * Name: dac7554_send
 ****************************************************************************/

static int dac7554_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg)
{
  FAR struct dac7554_dev_s *priv = (FAR struct dac7554_dev_s *)dev->ad_priv;
  uint16_t data;

  /* Sanity check */

  DEBUGASSERT(priv->SPI != NULL);

  /* Set up message to send */

  ainfo("value: %08x\n", msg->am_data);

  SPI_LOCK(priv->spi, true);

  dac7554_configspi(priv->spi);

  data = ((msg->am_data >> 16) & 0x0fff) | ((msg->am_channel & 0x03) << 12) |
    (1 << 15);

  SPI_SELECT(priv->spi, priv->spidev, true);

  SPI_SEND(priv->spi, (data >> 8));
  SPI_SEND(priv->spi, (data & 0xff));

  SPI_SELECT(priv->spi, priv->spidev, false);

  SPI_LOCK(priv->spi, false);

  dac_txdone(dev);
  return 0;
}

/****************************************************************************
 * Name: dac7554_ioctl
 ****************************************************************************/

static int dac7554_ioctl(FAR struct dac_dev_s *dev, int cmd,
                         unsigned long arg)
{
  return -ENOTTY;
}

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

/****************************************************************************
 * Name: dac7554_initialize
 *
 * Description:
 *   Initialize DAC
 *
 * Input Parameters:
 *   Port number (for hardware that has multiple DAC interfaces)
 *
 * Returned Value:
 *   Valid DAC7554 device structure reference on success; a NULL on failure
 *
 ****************************************************************************/

FAR struct dac_dev_s *dac7554_initialize(FAR struct spi_dev_s *spi,
                                         int spidev)
{
  FAR struct dac7554_dev_s *priv;
  FAR struct dac_dev_s *g_dacdev;

  /* Sanity check */

  DEBUGASSERT(i2c != NULL);

  /* Initialize the DAC7554 device structure */

  priv = (FAR struct dac7554_dev_s *)kmm_malloc(sizeof(struct dac7554_dev_s));
  priv->spi = spi;
  priv->spidev = spidev;

  g_dacdev = (FAR struct dac_dev_s *)kmm_malloc(sizeof(struct dac_dev_s));
  g_dacdev->ad_ops = &g_dacops;
  g_dacdev->ad_priv = priv;

  return g_dacdev;
}

#endif /* CONFIG_DAC7554 */