85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2020 Invensense, Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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#include <linux/iio/iio.h>
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#include "inv_icm42600.h"
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#include "inv_icm42600_temp.h"
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static int inv_icm42600_temp_read(struct inv_icm42600_state *st, int16_t *temp)
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{
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struct device *dev = regmap_get_device(st->map);
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__be16 *raw;
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int ret;
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pm_runtime_get_sync(dev);
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mutex_lock(&st->lock);
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ret = inv_icm42600_set_temp_conf(st, true, NULL);
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if (ret)
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goto exit;
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raw = (__be16 *)&st->buffer[0];
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ret = regmap_bulk_read(st->map, INV_ICM42600_REG_TEMP_DATA, raw, sizeof(*raw));
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if (ret)
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goto exit;
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*temp = (int16_t)be16_to_cpup(raw);
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if (*temp == INV_ICM42600_DATA_INVALID)
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ret = -EINVAL;
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exit:
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mutex_unlock(&st->lock);
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pm_runtime_mark_last_busy(dev);
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pm_runtime_put_autosuspend(dev);
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return ret;
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}
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int inv_icm42600_temp_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev);
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int16_t temp;
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int ret;
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if (chan->type != IIO_TEMP)
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return -EINVAL;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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ret = inv_icm42600_temp_read(st, &temp);
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iio_device_release_direct_mode(indio_dev);
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if (ret)
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return ret;
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*val = temp;
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return IIO_VAL_INT;
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/*
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* T°C = (temp / 132.48) + 25
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* Tm°C = 1000 * ((temp * 100 / 13248) + 25)
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* scale: 100000 / 13248 ~= 7.548309
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* offset: 25000
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*/
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case IIO_CHAN_INFO_SCALE:
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*val = 7;
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*val2 = 548309;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_OFFSET:
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*val = 25000;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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