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"); 97