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84 lines
1.8 KiB
84 lines
1.8 KiB
// 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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