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
  21 static 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
  52 static const struct iio_info iqs620_temp_info = {
  53         .read_raw = &iqs620_temp_read_raw,
  54 };
  55
  56 static 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
  65 static 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
  85 static struct platform_driver iqs620_temp_platform_driver = {
  86         .driver = {
  87                 .name = "iqs620at-temp",
  88         },
  89         .probe = iqs620_temp_probe,
  90 };
  91 module_platform_driver(iqs620_temp_platform_driver);
  92
  93 MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
  94 MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor");
  95 MODULE_LICENSE("GPL");
  96 MODULE_ALIAS("platform:iqs620at-temp");