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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (C) 2020 Invensense, Inc.4 */5 6#include <linux/kernel.h>7#include <linux/device.h>8#include <linux/mutex.h>9#include <linux/pm_runtime.h>10#include <linux/regmap.h>11#include <linux/iio/iio.h>12 13#include "inv_icm42600.h"14#include "inv_icm42600_temp.h"15 16static int inv_icm42600_temp_read(struct inv_icm42600_state *st, int16_t *temp)17{18 struct device *dev = regmap_get_device(st->map);19 __be16 *raw;20 int ret;21 22 pm_runtime_get_sync(dev);23 mutex_lock(&st->lock);24 25 ret = inv_icm42600_set_temp_conf(st, true, NULL);26 if (ret)27 goto exit;28 29 raw = (__be16 *)&st->buffer[0];30 ret = regmap_bulk_read(st->map, INV_ICM42600_REG_TEMP_DATA, raw, sizeof(*raw));31 if (ret)32 goto exit;33 34 *temp = (int16_t)be16_to_cpup(raw);35 if (*temp == INV_ICM42600_DATA_INVALID)36 ret = -EINVAL;37 38exit:39 mutex_unlock(&st->lock);40 pm_runtime_mark_last_busy(dev);41 pm_runtime_put_autosuspend(dev);42 43 return ret;44}45 46int inv_icm42600_temp_read_raw(struct iio_dev *indio_dev,47 struct iio_chan_spec const *chan,48 int *val, int *val2, long mask)49{50 struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev);51 int16_t temp;52 int ret;53 54 if (chan->type != IIO_TEMP)55 return -EINVAL;56 57 switch (mask) {58 case IIO_CHAN_INFO_RAW:59 ret = iio_device_claim_direct_mode(indio_dev);60 if (ret)61 return ret;62 ret = inv_icm42600_temp_read(st, &temp);63 iio_device_release_direct_mode(indio_dev);64 if (ret)65 return ret;66 *val = temp;67 return IIO_VAL_INT;68 /*69 * T°C = (temp / 132.48) + 2570 * Tm°C = 1000 * ((temp * 100 / 13248) + 25)71 * scale: 100000 / 13248 ~= 7.54830972 * offset: 2500073 */74 case IIO_CHAN_INFO_SCALE:75 *val = 7;76 *val2 = 548309;77 return IIO_VAL_INT_PLUS_MICRO;78 case IIO_CHAN_INFO_OFFSET:79 *val = 25000;80 return IIO_VAL_INT;81 default:82 return -EINVAL;83 }84}85