// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2020 Invensense, Inc.
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>

#include "inv_icm42600.h"
#include "inv_icm42600_temp.h"

static int inv_icm42600_temp_read(struct inv_icm42600_state *st, s16 *temp)
{
        struct device *dev = regmap_get_device(st->map);
        __be16 *raw;
        int ret;

        pm_runtime_get_sync(dev);
        mutex_lock(&st->lock);

        ret = inv_icm42600_set_temp_conf(st, true, NULL);
        if (ret)
                goto exit;

        raw = (__be16 *)&st->buffer[0];
        ret = regmap_bulk_read(st->map, INV_ICM42600_REG_TEMP_DATA, raw, sizeof(*raw));
        if (ret)
                goto exit;

        *temp = (s16)be16_to_cpup(raw);
        /*
         * Temperature data is invalid if both accel and gyro are off.
         * Return -EBUSY in this case.
         */
        if (*temp == INV_ICM42600_DATA_INVALID)
                ret = -EBUSY;

exit:
        mutex_unlock(&st->lock);
        pm_runtime_put_autosuspend(dev);

        return ret;
}

int inv_icm42600_temp_read_raw(struct iio_dev *indio_dev,
                               struct iio_chan_spec const *chan,
                               int *val, int *val2, long mask)
{
        struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev);
        s16 temp;
        int ret;

        if (chan->type != IIO_TEMP)
                return -EINVAL;

        switch (mask) {
        case IIO_CHAN_INFO_RAW:
                ret = inv_icm42600_temp_read(st, &temp);
                if (ret)
                        return ret;
                *val = temp;
                return IIO_VAL_INT;
        /*
         * T°C = (temp / 132.48) + 25
         * Tm°C = 1000 * ((temp / 132.48) + 25)
         * Tm°C = 7.548309 * temp + 25000
         * Tm°C = (temp + 3312) * 7.548309
         * scale: 100000 / 13248 ~= 7.548309
         * offset: 3312
         */
        case IIO_CHAN_INFO_SCALE:
                *val = 7;
                *val2 = 548309;
                return IIO_VAL_INT_PLUS_MICRO;
        case IIO_CHAN_INFO_OFFSET:
                *val = 3312;
                return IIO_VAL_INT;
        default:
                return -EINVAL;
        }
}