File content as of revision 0:e8a1ba50c46b:

/***************************************************************************//**
 *   @file   ad5593r.c
 *   @brief  Implementation of AD5593R driver.
 *   @author Mircea Caprioru (mircea.caprioru@analog.com)
********************************************************************************
 * Copyright 2018, 2020(c) Analog Devices, Inc.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - 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.
 *  - Neither the name of Analog Devices, Inc. nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *  - The use of this software may or may not infringe the patent rights
 *    of one or more patent holders.  This license does not release you
 *    from the requirement that you obtain separate licenses from these
 *    patent holders to use this software.
 *  - Use of the software either in source or binary form, must be run
 *    on or directly connected to an Analog Devices Inc. component.
 *
 * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, 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.
*******************************************************************************/

#include "ad5592r-base.h"
#include "error.h"
#include "ad5593r.h"

#define AD5593R_MODE_CONF		(0 << 4)
#define AD5593R_MODE_DAC_WRITE		(1 << 4)
#define AD5593R_MODE_ADC_READBACK	(4 << 4)
#define AD5593R_MODE_DAC_READBACK	(5 << 4)
#define AD5593R_MODE_GPIO_READBACK	(6 << 4)
#define AD5593R_MODE_REG_READBACK	(7 << 4)

#define STOP_BIT	1
#define RESTART_BIT	0
#define AD5593R_ADC_VALUES_BUFF_SIZE	    18

const struct ad5592r_rw_ops ad5593r_rw_ops = {
	.write_dac = ad5593r_write_dac,
	.read_adc = ad5593r_read_adc,
	.multi_read_adc= ad5593r_multi_read_adc,
	.reg_write = ad5593r_reg_write,
	.reg_read = ad5593r_reg_read,
	.gpio_read = ad5593r_gpio_read,
};

/**
 * Write DAC channel.
 *
 * @param dev - The device structure.
 * @param chan - The channel number.
 * @param value - DAC value
 * @return 0 in case of success, negative error code otherwise
 */
int32_t ad5593r_write_dac(struct ad5592r_dev *dev, uint8_t chan,
			  uint16_t value)
{
	uint8_t data[3];

	if (!dev)
		return FAILURE;

	data[0] = AD5593R_MODE_DAC_WRITE | chan;
	data[1] = (value >> 8) & 0xF ;
	data[2] = value & 0xFF;

	return i2c_write(dev->i2c, data, sizeof(data), STOP_BIT);
}

/**
 * Read ADC channel.
 *
 * @param dev - The device structure.
 * @param chan - The channel number.
 * @param value - ADC value
 * @return 0 in case of success, negative error code otherwise
 */
int32_t ad5593r_read_adc(struct ad5592r_dev *dev, uint8_t chan,
			 uint16_t *value)
{
	int32_t ret;
	uint8_t data[3];
	uint16_t temp;

	if (!dev)
		return FAILURE;

	temp = BIT(chan);

	data[0] = AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ;
	data[1] = temp >> 8;
	data[2] = temp & 0xFF;

	ret = i2c_write(dev->i2c, data, sizeof(data), STOP_BIT);
	if (ret < 0)
		return ret;

	data[0] = AD5593R_MODE_ADC_READBACK;
	ret = i2c_write(dev->i2c, data, 1, STOP_BIT);
	if (ret < 0)
		return ret;

	ret = i2c_read(dev->i2c, data, 2, STOP_BIT);
	if (ret < 0)
		return ret;

	*value = (uint16_t)((data[0] & 0x0F) << 8) + data[1];

	return 0;
}

/**
 * Read Multiple ADC Channels.
 *
 * @param dev - The device structure.
 * @param chans - The ADC channels to be readback
 * @param values - ADC value array
 * @return 0 in case of success, negative error code otherwise
 */
int32_t ad5593r_multi_read_adc(struct ad5592r_dev *dev, uint16_t chans,
			       uint16_t *values)
{
	uint8_t data[AD5593R_ADC_VALUES_BUFF_SIZE], i;
	int32_t ret;
	uint8_t samples;

	if (!dev)
		return FAILURE;

	samples = hweight8(chans);

	data[0] = AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ;
	data[1] = chans >> 8;
	data[2] = chans & 0xFF;

	ret = i2c_write(dev->i2c, data, 3, STOP_BIT);
	if (ret < 0)
		return ret;

	data[0] = AD5593R_MODE_ADC_READBACK;
	ret = i2c_write(dev->i2c, data, 1, RESTART_BIT);
	if (ret < 0)
		return ret;

	ret = i2c_read(dev->i2c, data, (2 * samples), STOP_BIT);
	if (ret < 0)
		return ret;

	for (i = 0; i < samples; i++) {
		values[i] = ((uint16_t)(((data[2 * i] & 0xFF) << 8) + data[(2 * i) + 1]));
	}

	return 0;
}

/**
 * Write register.
 *
 * @param dev - The device structure.
 * @param reg - The register address.
 * @param value - register value
 * @return 0 in case of success, negative error code otherwise
 */
int32_t ad5593r_reg_write(struct ad5592r_dev *dev, uint8_t reg,
			  uint16_t value)
{
	int32_t ret;
	uint8_t data[3];

	if (!dev)
		return FAILURE;

	data[0] = AD5593R_MODE_CONF | reg;
	data[1] = value >> 8;
	data[2] = value;

	ret = i2c_write(dev->i2c, data,sizeof(data), STOP_BIT);

	if (reg == AD5592R_REG_RESET && ret < 0) {
		return SUCCESS;
	}

	return ret;
}

/**
 * Read register.
 *
 * @param dev - The device structure.
 * @param reg - The register address.
 * @param value - register value
 * @return 0 in case of success, negative error code otherwise
 */
int32_t ad5593r_reg_read(struct ad5592r_dev *dev, uint8_t reg,
			 uint16_t *value)
{
	int32_t ret;
	uint8_t data[2];

	if (!dev)
		return FAILURE;

	data[0] = AD5593R_MODE_REG_READBACK | reg;

	ret = i2c_write(dev->i2c, data, 1, STOP_BIT);
	if (ret < 0)
		return ret;

	ret = i2c_read(dev->i2c, data, sizeof(data), STOP_BIT);
	if (ret < 0)
		return ret;

	*value = (uint16_t) (data[0] << 8) + data[1];

	return 0;
}

/**
 * Read GPIOs.
 *
 * @param dev - The device structure.
 * @param value - GPIOs value.
 * @return 0 in case of success, negative error code otherwise
 */
int32_t ad5593r_gpio_read(struct ad5592r_dev *dev, uint8_t *value)
{
	int32_t ret;
	uint8_t data[2];

	if (!dev)
		return FAILURE;

	data[0] = AD5593R_MODE_GPIO_READBACK;
	ret = i2c_write(dev->i2c, data, 1, STOP_BIT);
	if (ret < 0)
		return ret;

	ret = i2c_read(dev->i2c, data, sizeof(data), STOP_BIT);
	if (ret < 0)
		return ret;

	*value = data[1];

	return 0;
}

/**
 * Initialize AD5593r device.
 *
 * @param dev - The device structure.
 * @param init_param - The initial parameters of the device.
 * @return 0 in case of success, negative error code otherwise
 */
int32_t ad5593r_init(struct ad5592r_dev *dev,
		     struct ad5592r_init_param *init_param)
{
	int32_t ret;
	uint16_t temp_reg_val;

	if (!dev)
		return FAILURE;

	dev->ops = &ad5593r_rw_ops;

	ret = ad5592r_software_reset(dev);
	if (ret < 0)
		return ret;

	ret = ad5592r_set_channel_modes(dev);
	if (ret < 0)
		return ret;

	if(init_param->int_ref) {
		ret = ad5593r_reg_read(dev, AD5592R_REG_PD, &temp_reg_val);
		if (ret < 0)
			return ret;
		temp_reg_val |= AD5592R_REG_PD_EN_REF;

		return ad5593r_reg_write(dev, AD5592R_REG_PD, temp_reg_val);
	}

	return ret;
}