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// SPDX-License-Identifier: GPL-2.0+
/*
* Azoteq IQS620AT Temperature Sensor
*
* Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
*/
#include <linux/device.h>
#include <linux/iio/iio.h>
#include <linux/kernel.h>
#include <linux/mfd/iqs62x.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define IQS620_TEMP_UI_OUT 0x1A
#define IQS620_TEMP_SCALE 1000
#define IQS620_TEMP_OFFSET (-100)
#define IQS620_TEMP_OFFSET_V3 (-40)
static int iqs620_temp_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev);
int ret;
__le16 val_buf;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT,
&val_buf, sizeof(val_buf));
if (ret)
return ret;
*val = le16_to_cpu(val_buf);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = IQS620_TEMP_SCALE;
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
*val = iqs62x->hw_num < IQS620_HW_NUM_V3 ? IQS620_TEMP_OFFSET
: IQS620_TEMP_OFFSET_V3;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static const struct iio_info iqs620_temp_info = {
.read_raw = &iqs620_temp_read_raw,
};
static const struct iio_chan_spec iqs620_temp_channels[] = {
{
.type = IIO_TEMP,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET),
},
};
static int iqs620_temp_probe(struct platform_device *pdev)
{
struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
struct iio_dev *indio_dev;
indio_dev = devm_iio_device_alloc(&pdev->dev, 0);
if (!indio_dev)
return -ENOMEM;
iio_device_set_drvdata(indio_dev, iqs62x);
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = iqs620_temp_channels;
indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels);
indio_dev->name = iqs62x->dev_desc->dev_name;
indio_dev->info = &iqs620_temp_info;
return devm_iio_device_register(&pdev->dev, indio_dev);
}
static struct platform_driver iqs620_temp_platform_driver = {
.driver = {
.name = "iqs620at-temp",
},
.probe = iqs620_temp_probe,
};
module_platform_driver(iqs620_temp_platform_driver);
MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:iqs620at-temp");
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