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