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iio: imu: inv_icm42600: add temperature sensor support

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Add temperature channel in gyroscope and accelerometer devices.

Temperature is available in full 16 bits resolution when reading
register and in low 8 bits resolution in the FIFO. Return full
precision raw temperature with corresponding scale and offset.

Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jean-Baptiste Maneyrol 2020-06-22 17:37:22 +02:00 committed by Jonathan Cameron
parent a47c1cdcb9
commit bc3eb0207f
4 changed files with 134 additions and 2 deletions
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11
drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
View File

@ -13,6 +13,7 @@
#include <linux/iio/iio.h>
#include "inv_icm42600.h"
#include "inv_icm42600_temp.h"
#define INV_ICM42600_ACCEL_CHAN(_modifier, _index, _ext_info) \
{ \
@ -45,6 +46,7 @@ enum inv_icm42600_accel_scan {
INV_ICM42600_ACCEL_SCAN_X,
INV_ICM42600_ACCEL_SCAN_Y,
INV_ICM42600_ACCEL_SCAN_Z,
INV_ICM42600_ACCEL_SCAN_TEMP,
};
static const struct iio_chan_spec_ext_info inv_icm42600_accel_ext_infos[] = {
@ -59,6 +61,7 @@ static const struct iio_chan_spec inv_icm42600_accel_channels[] = {
inv_icm42600_accel_ext_infos),
INV_ICM42600_ACCEL_CHAN(IIO_MOD_Z, INV_ICM42600_ACCEL_SCAN_Z,
inv_icm42600_accel_ext_infos),
INV_ICM42600_TEMP_CHAN(INV_ICM42600_ACCEL_SCAN_TEMP),
};
static int inv_icm42600_accel_read_sensor(struct inv_icm42600_state *st,
@ -450,8 +453,14 @@ static int inv_icm42600_accel_read_raw(struct iio_dev *indio_dev,
int16_t data;
int ret;
if (chan->type != IIO_ACCEL)
switch (chan->type) {
case IIO_ACCEL:
break;
case IIO_TEMP:
return inv_icm42600_temp_read_raw(indio_dev, chan, val, val2, mask);
default:
return -EINVAL;
}
switch (mask) {
case IIO_CHAN_INFO_RAW:

11
drivers/iio/imu/inv_icm42600/inv_icm42600_gyro.c
View File

@ -13,6 +13,7 @@
#include <linux/iio/iio.h>
#include "inv_icm42600.h"
#include "inv_icm42600_temp.h"
#define INV_ICM42600_GYRO_CHAN(_modifier, _index, _ext_info) \
{ \
@ -45,6 +46,7 @@ enum inv_icm42600_gyro_scan {
INV_ICM42600_GYRO_SCAN_X,
INV_ICM42600_GYRO_SCAN_Y,
INV_ICM42600_GYRO_SCAN_Z,
INV_ICM42600_GYRO_SCAN_TEMP,
};
static const struct iio_chan_spec_ext_info inv_icm42600_gyro_ext_infos[] = {
@ -59,6 +61,7 @@ static const struct iio_chan_spec inv_icm42600_gyro_channels[] = {
inv_icm42600_gyro_ext_infos),
INV_ICM42600_GYRO_CHAN(IIO_MOD_Z, INV_ICM42600_GYRO_SCAN_Z,
inv_icm42600_gyro_ext_infos),
INV_ICM42600_TEMP_CHAN(INV_ICM42600_GYRO_SCAN_TEMP),
};
static int inv_icm42600_gyro_read_sensor(struct inv_icm42600_state *st,
@ -461,8 +464,14 @@ static int inv_icm42600_gyro_read_raw(struct iio_dev *indio_dev,
int16_t data;
int ret;
if (chan->type != IIO_ANGL_VEL)
switch (chan->type) {
case IIO_ANGL_VEL:
break;
case IIO_TEMP:
return inv_icm42600_temp_read_raw(indio_dev, chan, val, val2, mask);
default:
return -EINVAL;
}
switch (mask) {
case IIO_CHAN_INFO_RAW:

84
drivers/iio/imu/inv_icm42600/inv_icm42600_temp.c Normal file
View File

@ -0,0 +1,84 @@
// 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, int16_t *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 = (int16_t)be16_to_cpup(raw);
if (*temp == INV_ICM42600_DATA_INVALID)
ret = -EINVAL;
exit:
mutex_unlock(&st->lock);
pm_runtime_mark_last_busy(dev);
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);
int16_t temp;
int ret;
if (chan->type != IIO_TEMP)
return -EINVAL;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = inv_icm42600_temp_read(st, &temp);
iio_device_release_direct_mode(indio_dev);
if (ret)
return ret;
*val = temp;
return IIO_VAL_INT;
/*
* T°C = (temp / 132.48) + 25
* Tm°C = 1000 * ((temp * 100 / 13248) + 25)
* scale: 100000 / 13248 ~= 7.548309
* offset: 25000
*/
case IIO_CHAN_INFO_SCALE:
*val = 7;
*val2 = 548309;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_OFFSET:
*val = 25000;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}

30
drivers/iio/imu/inv_icm42600/inv_icm42600_temp.h Normal file
View File

@ -0,0 +1,30 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2020 Invensense, Inc.
*/
#ifndef INV_ICM42600_TEMP_H_
#define INV_ICM42600_TEMP_H_
#include <linux/iio/iio.h>
#define INV_ICM42600_TEMP_CHAN(_index) \
{ \
.type = IIO_TEMP, \
.info_mask_separate = \
BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_OFFSET) | \
BIT(IIO_CHAN_INFO_SCALE), \
.scan_index = _index, \
.scan_type = { \
.sign = 's', \
.realbits = 16, \
.storagebits = 16, \
}, \
}
int inv_icm42600_temp_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask);
#endif