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 #define IQS620_TEMP_OFFSET_V3 (-40) 21 22 static 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_OFFSET 46 : IQS620_TEMP_OFFSET_V3; 47 return IIO_VAL_INT; 48 49 default: 50 return -EINVAL; 51 } 52 } 53 54 static const struct iio_info iqs620_temp_info = { 55 .read_raw = &iqs620_temp_read_raw, 56 }; 57 58 static 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 67 static 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 87 static struct platform_driver iqs620_temp_platform_driver = { 88 .driver = { 89 .name = "iqs620at-temp", 90 }, 91 .probe = iqs620_temp_probe, 92 }; 93 module_platform_driver(iqs620_temp_platform_driver); 94 95 MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>"); 96 MODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor"); 97 MODULE_LICENSE("GPL"); 98 MODULE_ALIAS("platform:iqs620at-temp"); 99