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drivers: power: ltc2378: Add IIO support for LTC2378
Add initial header and source file for LTC2378 IIO driver. Signed-off-by: Cherrence Sarip <cherrence.sarip@analog.com>
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‎drivers/adc/ltc2378/iio_ltc2378.c‎

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/***************************************************************************//**
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* @file iio_ltc2378.c
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* @brief Implementation of iio_ltc2378.c.
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* @author Cherrence Sarip (cherrence.sarip@analog.com)
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********************************************************************************
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* Copyright 2025(c) Analog Devices, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of Analog Devices, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES, INC. “AS IS” AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL ANALOG DEVICES, INC. BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "no_os_alloc.h"
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#include "no_os_error.h"
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#include "no_os_units.h"
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#include "no_os_util.h"
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#include "iio.h"
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#include "ltc2378.h"
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#include "iio_ltc2378.h"
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enum ltc2378_iio_attr {
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LTC2378_IIO_RAW,
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LTC2378_IIO_SCALE,
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LTC2378_IIO_PROCESSED,
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};
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/**
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* @brief Read from ADC and provide IIO data
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* @param dev - The iio device structure.
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* @param buf - Buffer to be filled with requested attr val.
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* @param len - Length of the received command buffer in bytes.
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* @param channel - Command channel info.
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* @param priv - Command attribute id.
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* @return 0 in case of success, negative error code otherwise.
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*/
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static int ltc2378_iio_read(void *dev, char *buf, uint32_t len,
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const struct iio_ch_info *channel, intptr_t priv)
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{
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struct ltc2378_iio_desc *iio_ltc2378 = dev;
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struct ltc2378_dev *ltc2378 = iio_ltc2378->ltc2378_dev;
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int ret;
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int64_t vals[2];
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uint32_t raw_data;
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int32_t voltage_uv;
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if (!dev || !iio_ltc2378->ltc2378_dev)
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return -EINVAL;
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switch (priv) {
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case LTC2378_IIO_RAW:
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ret = ltc2378_read_raw(ltc2378, &raw_data);
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if (ret)
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return ret;
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vals[0] = raw_data;
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vals[1] = 0;
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return iio_format_value(buf, len, IIO_VAL_INT, 1, vals);
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case LTC2378_IIO_SCALE:
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vals[0] = ltc2378->vref_uv;
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if (ltc2378->input_mode == LTC2378_UNIPOLAR) {
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vals[1] = 20;
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} else {
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vals[1] = 19;
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}
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return iio_format_value(buf, len, IIO_VAL_FRACTIONAL_LOG2, 2, vals);
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case LTC2378_IIO_PROCESSED:
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ret = ltc2378_read_raw(ltc2378, &raw_data);
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if (ret) {
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vals[0] = -1000000;
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vals[1] = 0;
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return iio_format_value(buf, len, IIO_VAL_INT, 1, vals);
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}
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ret = ltc2378_raw_to_uv(ltc2378, raw_data, &voltage_uv);
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if (ret) {
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vals[0] = -2000000;
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vals[1] = 0;
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return iio_format_value(buf, len, IIO_VAL_INT, 1, vals);
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}
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vals[0] = voltage_uv;
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vals[1] = 0;
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return iio_format_value(buf, len, IIO_VAL_INT, 1, vals);
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default:
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return -EINVAL;
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}
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}
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static struct iio_attribute ltc2378_iio_attrs[] = {
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{
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.name = "raw",
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.show = ltc2378_iio_read,
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.store = NULL,
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.priv = LTC2378_IIO_RAW,
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},
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{
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.name = "scale",
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.show = ltc2378_iio_read,
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.store = NULL,
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.priv = LTC2378_IIO_SCALE,
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},
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{
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.name = "processed",
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.show = ltc2378_iio_read,
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.store = NULL,
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.priv = LTC2378_IIO_PROCESSED,
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},
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END_ATTRIBUTES_ARRAY
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};
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static struct iio_channel ltc2378_iio_channels[] = {
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{
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.name = "voltage0",
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.attributes = ltc2378_iio_attrs,
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.ch_type = IIO_VOLTAGE,
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.indexed = true,
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}
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};
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static struct iio_device ltc2378_iio_dev = {
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.channels = ltc2378_iio_channels,
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.num_ch = NO_OS_ARRAY_SIZE(ltc2378_iio_channels),
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.debug_reg_read = NULL,
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.debug_reg_write = NULL,
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};
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/**
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* @brief Initialize the IIO LTC2378 driver
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* @param iio_desc - IIO device descriptor.
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* @param init_param - Init parameter structure.
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* @return 0 in case of success, negative error code otherwise.
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*/
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int ltc2378_iio_init(struct ltc2378_iio_desc **iio_desc,
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struct ltc2378_iio_desc_init_param *init_param)
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{
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struct ltc2378_iio_desc *descriptor;
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int ret;
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if (!iio_desc || !init_param || !init_param->ltc2378_init_param)
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return -EINVAL;
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descriptor = no_os_calloc(1, sizeof(*descriptor));
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if (!descriptor)
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return -ENOMEM;
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ret = ltc2378_init(&descriptor->ltc2378_dev, init_param->ltc2378_init_param);
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if (ret)
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goto error_free_desc;
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descriptor->iio_dev = &ltc2378_iio_dev;
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*iio_desc = descriptor;
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return 0;
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error_free_desc:
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no_os_free(descriptor);
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return ret;
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}
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/**
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* @brief Free the resources allocated by ltc2378_iio_init()
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* @param iio_desc - IIO device descriptor.
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* @return 0 in case of success, negative error code otherwise.
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*/
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int ltc2378_iio_remove(struct ltc2378_iio_desc *iio_desc)
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{
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if (!iio_desc)
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return -EINVAL;
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ltc2378_remove(iio_desc->ltc2378_dev);
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no_os_free(iio_desc);
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return 0;
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}

‎drivers/adc/ltc2378/iio_ltc2378.h‎

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/***************************************************************************//**
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* @file iio_ltc2378.h
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* @brief Header file of the LTC2378 IIO Driver
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* @author Cherrence Sarip (cherrence.sarip@analog.com)
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********************************************************************************
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* Copyright 2025(c) Analog Devices, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
9+
* modification, are permitted provided that the following conditions are met:
10+
*
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* 1. Redistributions of source code must retain the above copyright notice,
12+
* this list of conditions and the following disclaimer.
13+
*
14+
* 2. Redistributions in binary form must reproduce the above copyright notice,
15+
* this list of conditions and the following disclaimer in the documentation
16+
* and/or other materials provided with the distribution.
17+
*
18+
* 3. Neither the name of Analog Devices, Inc. nor the names of its
19+
* contributors may be used to endorse or promote products derived from this
20+
* software without specific prior written permission.
21+
*
22+
* THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES, INC. “AS IS” AND ANY EXPRESS OR
23+
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24+
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
25+
* EVENT SHALL ANALOG DEVICES, INC. BE LIABLE FOR ANY DIRECT, INDIRECT,
26+
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27+
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
28+
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29+
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30+
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
31+
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************/
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#ifndef IIO_LTC2378_H
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#define IIO_LTC2378_H
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#include <stdbool.h>
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#include "ltc2378.h"
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struct ltc2378_iio_desc {
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struct ltc2378_dev *ltc2378_dev;
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struct iio_device *iio_dev;
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};
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struct ltc2378_iio_desc_init_param {
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struct ltc2378_init_param *ltc2378_init_param;
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};
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/* Initialize the LTC2378 IIO descriptor */
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int ltc2378_iio_init(struct ltc2378_iio_desc **,
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struct ltc2378_iio_desc_init_param *);
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/* Free resources allocated by the IIO initialization function */
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int ltc2378_iio_remove(struct ltc2378_iio_desc *);
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#endif /* IIO_LTC2378_H */

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