18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0+ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Azoteq IQS620AT Temperature Sensor 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com> 68c2ecf20Sopenharmony_ci */ 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci#include <linux/device.h> 98c2ecf20Sopenharmony_ci#include <linux/iio/iio.h> 108c2ecf20Sopenharmony_ci#include <linux/kernel.h> 118c2ecf20Sopenharmony_ci#include <linux/mfd/iqs62x.h> 128c2ecf20Sopenharmony_ci#include <linux/module.h> 138c2ecf20Sopenharmony_ci#include <linux/platform_device.h> 148c2ecf20Sopenharmony_ci#include <linux/regmap.h> 158c2ecf20Sopenharmony_ci 168c2ecf20Sopenharmony_ci#define IQS620_TEMP_UI_OUT 0x1A 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_ci#define IQS620_TEMP_SCALE 1000 198c2ecf20Sopenharmony_ci#define IQS620_TEMP_OFFSET (-100) 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_cistatic int iqs620_temp_read_raw(struct iio_dev *indio_dev, 228c2ecf20Sopenharmony_ci struct iio_chan_spec const *chan, 238c2ecf20Sopenharmony_ci int *val, int *val2, long mask) 248c2ecf20Sopenharmony_ci{ 258c2ecf20Sopenharmony_ci struct iqs62x_core *iqs62x = iio_device_get_drvdata(indio_dev); 268c2ecf20Sopenharmony_ci int ret; 278c2ecf20Sopenharmony_ci __le16 val_buf; 288c2ecf20Sopenharmony_ci 298c2ecf20Sopenharmony_ci switch (mask) { 308c2ecf20Sopenharmony_ci case IIO_CHAN_INFO_RAW: 318c2ecf20Sopenharmony_ci ret = regmap_raw_read(iqs62x->regmap, IQS620_TEMP_UI_OUT, 328c2ecf20Sopenharmony_ci &val_buf, sizeof(val_buf)); 338c2ecf20Sopenharmony_ci if (ret) 348c2ecf20Sopenharmony_ci return ret; 358c2ecf20Sopenharmony_ci 368c2ecf20Sopenharmony_ci *val = le16_to_cpu(val_buf); 378c2ecf20Sopenharmony_ci return IIO_VAL_INT; 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_ci case IIO_CHAN_INFO_SCALE: 408c2ecf20Sopenharmony_ci *val = IQS620_TEMP_SCALE; 418c2ecf20Sopenharmony_ci return IIO_VAL_INT; 428c2ecf20Sopenharmony_ci 438c2ecf20Sopenharmony_ci case IIO_CHAN_INFO_OFFSET: 448c2ecf20Sopenharmony_ci *val = IQS620_TEMP_OFFSET; 458c2ecf20Sopenharmony_ci return IIO_VAL_INT; 468c2ecf20Sopenharmony_ci 478c2ecf20Sopenharmony_ci default: 488c2ecf20Sopenharmony_ci return -EINVAL; 498c2ecf20Sopenharmony_ci } 508c2ecf20Sopenharmony_ci} 518c2ecf20Sopenharmony_ci 528c2ecf20Sopenharmony_cistatic const struct iio_info iqs620_temp_info = { 538c2ecf20Sopenharmony_ci .read_raw = &iqs620_temp_read_raw, 548c2ecf20Sopenharmony_ci}; 558c2ecf20Sopenharmony_ci 568c2ecf20Sopenharmony_cistatic const struct iio_chan_spec iqs620_temp_channels[] = { 578c2ecf20Sopenharmony_ci { 588c2ecf20Sopenharmony_ci .type = IIO_TEMP, 598c2ecf20Sopenharmony_ci .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 608c2ecf20Sopenharmony_ci BIT(IIO_CHAN_INFO_SCALE) | 618c2ecf20Sopenharmony_ci BIT(IIO_CHAN_INFO_OFFSET), 628c2ecf20Sopenharmony_ci }, 638c2ecf20Sopenharmony_ci}; 648c2ecf20Sopenharmony_ci 658c2ecf20Sopenharmony_cistatic int iqs620_temp_probe(struct platform_device *pdev) 668c2ecf20Sopenharmony_ci{ 678c2ecf20Sopenharmony_ci struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent); 688c2ecf20Sopenharmony_ci struct iio_dev *indio_dev; 698c2ecf20Sopenharmony_ci 708c2ecf20Sopenharmony_ci indio_dev = devm_iio_device_alloc(&pdev->dev, 0); 718c2ecf20Sopenharmony_ci if (!indio_dev) 728c2ecf20Sopenharmony_ci return -ENOMEM; 738c2ecf20Sopenharmony_ci 748c2ecf20Sopenharmony_ci iio_device_set_drvdata(indio_dev, iqs62x); 758c2ecf20Sopenharmony_ci 768c2ecf20Sopenharmony_ci indio_dev->modes = INDIO_DIRECT_MODE; 778c2ecf20Sopenharmony_ci indio_dev->channels = iqs620_temp_channels; 788c2ecf20Sopenharmony_ci indio_dev->num_channels = ARRAY_SIZE(iqs620_temp_channels); 798c2ecf20Sopenharmony_ci indio_dev->name = iqs62x->dev_desc->dev_name; 808c2ecf20Sopenharmony_ci indio_dev->info = &iqs620_temp_info; 818c2ecf20Sopenharmony_ci 828c2ecf20Sopenharmony_ci return devm_iio_device_register(&pdev->dev, indio_dev); 838c2ecf20Sopenharmony_ci} 848c2ecf20Sopenharmony_ci 858c2ecf20Sopenharmony_cistatic struct platform_driver iqs620_temp_platform_driver = { 868c2ecf20Sopenharmony_ci .driver = { 878c2ecf20Sopenharmony_ci .name = "iqs620at-temp", 888c2ecf20Sopenharmony_ci }, 898c2ecf20Sopenharmony_ci .probe = iqs620_temp_probe, 908c2ecf20Sopenharmony_ci}; 918c2ecf20Sopenharmony_cimodule_platform_driver(iqs620_temp_platform_driver); 928c2ecf20Sopenharmony_ci 938c2ecf20Sopenharmony_ciMODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>"); 948c2ecf20Sopenharmony_ciMODULE_DESCRIPTION("Azoteq IQS620AT Temperature Sensor"); 958c2ecf20Sopenharmony_ciMODULE_LICENSE("GPL"); 968c2ecf20Sopenharmony_ciMODULE_ALIAS("platform:iqs620at-temp"); 97