/****************************************************************************
 *
 *   Copyright (c) 2015 PX4 Development Team. 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 PX4 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.
 *
 ****************************************************************************/

/**
 * @file px4cannode_led.c
 *
 * PX4FMU SPI backend.
 */

/************************************************************************************
 * Included Files
 ************************************************************************************/

#include <px4_config.h>

#include <stdint.h>
#include <stdbool.h>
#include <errno.h>
#include <debug.h>

#include <nuttx/spi/spi.h>
#include <arch/board/board.h>

#include <nuttx/board.h>
#include "chip.h"
#include "stm32.h"
#include "board_config.h"

#if defined(CONFIG_STM32_SPI1) || defined(CONFIG_STM32_SPI2) || defined(CONFIG_STM32_SPI3)

/************************************************************************************
 * Definitions
 ************************************************************************************/


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

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

/************************************************************************************
 * Name: stm32_spiinitialize
 *
 * Description:
 *   Called to configure SPI chip select GPIO pins for the board.
 *
 ************************************************************************************/

void weak_function board_spiinitialize(void)
{
	/* Setup CS */

#ifdef CONFIG_STM32_SPI1
	stm32_configgpio(USER_CSn);
#endif

#ifdef CONFIG_STM32_SPI2
	stm32_configgpio(MMCSD_CSn);
#endif
}

/****************************************************************************
 * Name:  stm32_spi1/2/3select and stm32_spi1/2/3status
 *
 * Description:
 *   The external functions, stm32_spi1/2/3select and stm32_spi1/2/3status
 *   must be provided by board-specific logic.  They are implementations of
 *   the select and status methods of the SPI interface defined by struct
 *   spi_ops_s (see include/nuttx/spi/spi.h). All other methods (including
 *   stm32_spibus_initialize()) are provided by common STM32 logic.  To use
 *   this common SPI logic on your board:
 *
 *   1. Provide logic in stm32_boardinitialize() to configure SPI chip
 *      select pins.
 *   2. Provide stm32_spi1/2/3select() and stm32_spi1/2/3status() functions
 *      in your board-specific logic.  These functions will perform chip
 *      selection and status operations using GPIOs in the way your board
 *      is configured.
 *   3. Add a calls to stm32_spibus_initialize() in your low level application
 *      initialization logic
 *   4. The handle returned by stm32_spibus_initialize() may then be used to
 *      bind the SPI driver to higher level logic (e.g., calling
 *      mmcsd_spislotinitialize(), for example, will bind the SPI driver to
 *      the SPI MMC/SD driver).
 *
 ****************************************************************************/

#ifdef CONFIG_STM32_SPI1
void stm32_spi1select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
{
	spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");

	if (devid == SPIDEV_USER) {
		stm32_gpiowrite(USER_CSn, !selected);
	}
}

uint8_t stm32_spi1status(FAR struct spi_dev_s *dev, uint32_t devid)
{
	return 0;
}
#endif

#ifdef CONFIG_STM32_SPI2
void stm32_spi2select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
{
	spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
#if defined(CONFIG_MMCSD)

	if (devid == SPIDEV_MMCSD) {
		stm32_gpiowrite(MMCSD_CSn, !selected);
	}

#endif
}

uint8_t stm32_spi2status(FAR struct spi_dev_s *dev, uint32_t devid)
{
	/* No switch on SD card socket so assume it is here */

	return SPI_STATUS_PRESENT;
}
#endif

#ifdef CONFIG_STM32_SPI3
void stm32_spi3select(FAR struct spi_dev_s *dev, uint32_t devid, bool selected)
{
	spiinfo("devid: %d CS: %s\n", (int)devid, selected ? "assert" : "de-assert");
}

uint8_t stm32_spi3status(FAR struct spi_dev_s *dev, uint32_t devid)
{
	return 0;
}
#endif

/****************************************************************************
 * Name: stm32_spi1cmddata
 *
 * Description:
 *   Set or clear the SH1101A A0 or SD1306 D/C n bit to select data (true)
 *   or command (false). This function must be provided by platform-specific
 *   logic. This is an implementation of the cmddata method of the SPI
 *   interface defined by struct spi_ops_s (see include/nuttx/spi/spi.h).
 *
 * Input Parameters:
 *
 *   spi - SPI device that controls the bus the device that requires the CMD/
 *         DATA selection.
 *   devid - If there are multiple devices on the bus, this selects which one
 *         to select cmd or data.  NOTE:  This design restricts, for example,
 *         one one SPI display per SPI bus.
 *   cmd - true: select command; false: select data
 *
 * Returned Value:
 *   None
 *
 ****************************************************************************/

#ifdef CONFIG_SPI_CMDDATA
#ifdef CONFIG_STM32_SPI1
int stm32_spi1cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
{
	return OK;
}
#endif

#ifdef CONFIG_STM32_SPI2
int stm32_spi2cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
{
	return OK;
}
#endif

#ifdef CONFIG_STM32_SPI3
int stm32_spi3cmddata(FAR struct spi_dev_s *dev, uint32_t devid, bool cmd)
{
	return -ENODEV;
}
#endif
#endif /* CONFIG_SPI_CMDDATA */

#endif /* CONFIG_STM32_SPI1 || CONFIG_STM32_SPI2 */
