cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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inv_icm42600_temp.c (1834B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      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) + 25
     70	 * Tm°C = 1000 * ((temp * 100 / 13248) + 25)
     71	 * scale: 100000 / 13248 ~= 7.548309
     72	 * offset: 25000
     73	 */
     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}