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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Azoteq IQS620AT Temperature Sensor
- *
- * Copyright (C) 2019 Jeff LaBundy <[email protected]>
- */
- #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 <[email protected]>");
- MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:iqs620at-temp");
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