LXR linux/drivers/iio/temperature/iqs620at-temp.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Azoteq IQS620AT Temperature Sensor
   4 *
   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                      0x1A
  17
  18#define IQS620_TEMP_SCALE                       1000
  19#define IQS620_TEMP_OFFSET                      (-100)
  20
  21static int iqs620_temp_read_raw(struct iio_dev *indio_dev,
  22                                struct iio_chan_spec const *chan,
  23                                int *val, int *val2, long mask)
  24{
  25        struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev);
  26        int ret;
  27        __le16 val_buf;
  28
  29        switch (mask) {
  30        case IIO_CHAN_INFO_RAW:
  31                ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT,
  32                                      &val_buf, sizeof(val_buf));
  33                if (ret)
  34                        return ret;
  35
  36                *val = le16_to_cpu(val_buf);
  37                return IIO_VAL_INT;
  38
  39        case IIO_CHAN_INFO_SCALE:
  40                *val = IQS620_TEMP_SCALE;
  41                return IIO_VAL_INT;
  42
  43        case IIO_CHAN_INFO_OFFSET:
  44                *val = IQS620_TEMP_OFFSET;
  45                return IIO_VAL_INT;
  46
  47        default:
  48                return -EINVAL;
  49        }
  50}
  51
  52static const struct iio_info iqs620_temp_info = {
  53        .read_raw = &iqs620_temp_read_raw,
  54};
  55
  56static const struct iio_chan_spec iqs620_temp_channels[] = {
  57        {
  58                .type = IIO_TEMP,
  59                .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
  60                                      BIT(IIO_CHAN_INFO_SCALE) |
  61                                      BIT(IIO_CHAN_INFO_OFFSET),
  62        },
  63};
  64
  65static int iqs620_temp_probe(struct platform_device *pdev)
  66{
  67        struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
  68        struct iio_dev *indio_dev;
  69
  70        indio_dev = devm_iio_device_alloc(&pdev->dev, 0);
  71        if (!indio_dev)
  72                return -ENOMEM;
  73
  74        iio_device_set_drvdata(indio_dev, iqs62x);
  75
  76        indio_dev->modes = INDIO_DIRECT_MODE;
  77        indio_dev->channels = iqs620_temp_channels;
  78        indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels);
  79        indio_dev->name = iqs62x->dev_desc->dev_name;
  80        indio_dev->info = &iqs620_temp_info;
  81
  82        return devm_iio_device_register(&pdev->dev, indio_dev);
  83}
  84
  85static struct platform_driver iqs620_temp_platform_driver = {
  86        .driver = {
  87                .name = "iqs620at-temp",
  88        },
  89        .probe = iqs620_temp_probe,
  90};
  91module_platform_driver(iqs620_temp_platform_driver);
  92
  93MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
  94MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
  95MODULE_LICENSE("GPL");
  96MODULE_ALIAS("platform:iqs620at-temp");
  97