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}
85