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1// SPDX-License-Identifier: GPL-2.0+2/*3 * Azoteq IQS620AT Temperature Sensor4 *5 * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>6 */7 8#include <linux/device.h>9#include <linux/iio/iio.h>10#include <linux/kernel.h>11#include <linux/mfd/iqs62x.h>12#include <linux/module.h>13#include <linux/platform_device.h>14#include <linux/regmap.h>15 16#define IQS620_TEMP_UI_OUT 0x1A17 18#define IQS620_TEMP_SCALE 100019#define IQS620_TEMP_OFFSET (-100)20#define IQS620_TEMP_OFFSET_V3 (-40)21 22static int iqs620_temp_read_raw(struct iio_dev *indio_dev,23 struct iio_chan_spec const *chan,24 int *val, int *val2, long mask)25{26 struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev);27 int ret;28 __le16 val_buf;29 30 switch (mask) {31 case IIO_CHAN_INFO_RAW:32 ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT,33 &val_buf, sizeof(val_buf));34 if (ret)35 return ret;36 37 *val = le16_to_cpu(val_buf);38 return IIO_VAL_INT;39 40 case IIO_CHAN_INFO_SCALE:41 *val = IQS620_TEMP_SCALE;42 return IIO_VAL_INT;43 44 case IIO_CHAN_INFO_OFFSET:45 *val = iqs62x->hw_num < IQS620_HW_NUM_V3 ? IQS620_TEMP_OFFSET46 : IQS620_TEMP_OFFSET_V3;47 return IIO_VAL_INT;48 49 default:50 return -EINVAL;51 }52}53 54static const struct iio_info iqs620_temp_info = {55 .read_raw = &iqs620_temp_read_raw,56};57 58static const struct iio_chan_spec iqs620_temp_channels[] = {59 {60 .type = IIO_TEMP,61 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |62 BIT(IIO_CHAN_INFO_SCALE) |63 BIT(IIO_CHAN_INFO_OFFSET),64 },65};66 67static int iqs620_temp_probe(struct platform_device *pdev)68{69 struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);70 struct iio_dev *indio_dev;71 72 indio_dev = devm_iio_device_alloc(&pdev->dev, 0);73 if (!indio_dev)74 return -ENOMEM;75 76 iio_device_set_drvdata(indio_dev, iqs62x);77 78 indio_dev->modes = INDIO_DIRECT_MODE;79 indio_dev->channels = iqs620_temp_channels;80 indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels);81 indio_dev->name = iqs62x->dev_desc->dev_name;82 indio_dev->info = &iqs620_temp_info;83 84 return devm_iio_device_register(&pdev->dev, indio_dev);85}86 87static struct platform_driver iqs620_temp_platform_driver = {88 .driver = {89 .name = "iqs620at-temp",90 },91 .probe = iqs620_temp_probe,92};93module_platform_driver(iqs620_temp_platform_driver);94 95MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");96MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");97MODULE_LICENSE("GPL");98MODULE_ALIAS("platform:iqs620at-temp");99