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Tue, 28 Jul 2026 15:58:12 -0700 (PDT) From: Chris Morgan To: linux-iio@vger.kernel.org Cc: andy@kernel.org, nuno.sa@analog.com, dlechner@baylibre.com, jic23@kernel.org, jean-baptiste.maneyrol@tdk.com, linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, heiko@sntech.de, conor+dt@kernel.org, krzk+dt@kernel.org, robh@kernel.org, andriy.shevchenko@intel.com, Chris Morgan Subject: [PATCH V21 8/9] iio: imu: inv_icm42607: Add Temp Support in icm42607 Date: Tue, 28 Jul 2026 17:55:39 -0500 Message-ID: <20260728225542.174825-9-macroalpha82@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260728225542.174825-1-macroalpha82@gmail.com> References: <20260728225542.174825-1-macroalpha82@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Chris Morgan Add functions for reading temperature sensor data. Signed-off-by: Chris Morgan --- drivers/iio/imu/inv_icm42607/Makefile | 1 + .../iio/imu/inv_icm42607/inv_icm42607_accel.c | 8 ++ .../iio/imu/inv_icm42607/inv_icm42607_gyro.c | 8 ++ .../iio/imu/inv_icm42607/inv_icm42607_temp.c | 99 +++++++++++++++++++ .../iio/imu/inv_icm42607/inv_icm42607_temp.h | 38 +++++++ 5 files changed, 154 insertions(+) create mode 100644 drivers/iio/imu/inv_icm42607/inv_icm42607_temp.c create mode 100644 drivers/iio/imu/inv_icm42607/inv_icm42607_temp.h diff --git a/drivers/iio/imu/inv_icm42607/Makefile b/drivers/iio/imu/inv_icm42607/Makefile index 8e73385c8f4b..7b907e019601 100644 --- a/drivers/iio/imu/inv_icm42607/Makefile +++ b/drivers/iio/imu/inv_icm42607/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_INV_ICM42607) += inv-icm42607.o inv-icm42607-y += inv_icm42607_core.o inv-icm42607-y += inv_icm42607_gyro.o inv-icm42607-y += inv_icm42607_accel.o +inv-icm42607-y += inv_icm42607_temp.o obj-$(CONFIG_INV_ICM42607_I2C) += inv-icm42607-i2c.o inv-icm42607-i2c-y += inv_icm42607_i2c.o diff --git a/drivers/iio/imu/inv_icm42607/inv_icm42607_accel.c b/drivers/iio/imu/inv_icm42607/inv_icm42607_accel.c index f563c7708420..0b3f035c2da0 100644 --- a/drivers/iio/imu/inv_icm42607/inv_icm42607_accel.c +++ b/drivers/iio/imu/inv_icm42607/inv_icm42607_accel.c @@ -15,6 +15,7 @@ #include #include "inv_icm42607.h" +#include "inv_icm42607_temp.h" #define INV_ICM42607_ACCEL_CHAN(_modifier, _index, _ext_info) \ { \ @@ -40,6 +41,7 @@ enum inv_icm42607_accel_scan { INV_ICM42607_ACCEL_SCAN_X, INV_ICM42607_ACCEL_SCAN_Y, INV_ICM42607_ACCEL_SCAN_Z, + INV_ICM42607_ACCEL_SCAN_TEMP, }; static const struct iio_chan_spec_ext_info inv_icm42607_accel_ext_infos[] = { @@ -54,6 +56,7 @@ static const struct iio_chan_spec inv_icm42607_accel_channels[] = { inv_icm42607_accel_ext_infos), INV_ICM42607_ACCEL_CHAN(IIO_MOD_Z, INV_ICM42607_ACCEL_SCAN_Z, inv_icm42607_accel_ext_infos), + INV_ICM42607_TEMP_CHAN(INV_ICM42607_ACCEL_SCAN_TEMP), }; static const int inv_icm42607_accel_scale_nano[][2] = { @@ -187,6 +190,11 @@ static int inv_icm42607_accel_read_raw(struct iio_dev *indio_dev, switch (chan->type) { case IIO_ACCEL: break; + case IIO_TEMP: + if (mask != IIO_CHAN_INFO_SAMP_FREQ) + return inv_icm42607_temp_read_raw(indio_dev, chan, + val, val2, mask); + break; default: return -EINVAL; } diff --git a/drivers/iio/imu/inv_icm42607/inv_icm42607_gyro.c b/drivers/iio/imu/inv_icm42607/inv_icm42607_gyro.c index b68d4d6f5c3f..5b4683c2dd1e 100644 --- a/drivers/iio/imu/inv_icm42607/inv_icm42607_gyro.c +++ b/drivers/iio/imu/inv_icm42607/inv_icm42607_gyro.c @@ -15,6 +15,7 @@ #include #include "inv_icm42607.h" +#include "inv_icm42607_temp.h" #define INV_ICM42607_GYRO_CHAN(_modifier, _index, _ext_info) \ { \ @@ -40,6 +41,7 @@ enum inv_icm42607_gyro_scan { INV_ICM42607_GYRO_SCAN_X, INV_ICM42607_GYRO_SCAN_Y, INV_ICM42607_GYRO_SCAN_Z, + INV_ICM42607_GYRO_SCAN_TEMP, }; static const struct iio_chan_spec_ext_info inv_icm42607_gyro_ext_infos[] = { @@ -54,6 +56,7 @@ static const struct iio_chan_spec inv_icm42607_gyro_channels[] = { inv_icm42607_gyro_ext_infos), INV_ICM42607_GYRO_CHAN(IIO_MOD_Z, INV_ICM42607_GYRO_SCAN_Z, inv_icm42607_gyro_ext_infos), + INV_ICM42607_TEMP_CHAN(INV_ICM42607_GYRO_SCAN_TEMP), }; static const int inv_icm42607_gyro_scale_nano[][2] = { @@ -184,6 +187,11 @@ static int inv_icm42607_gyro_read_raw(struct iio_dev *indio_dev, switch (chan->type) { case IIO_ANGL_VEL: break; + case IIO_TEMP: + if (mask != IIO_CHAN_INFO_SAMP_FREQ) + return inv_icm42607_temp_read_raw(indio_dev, chan, + val, val2, mask); + break; default: return -EINVAL; } diff --git a/drivers/iio/imu/inv_icm42607/inv_icm42607_temp.c b/drivers/iio/imu/inv_icm42607/inv_icm42607_temp.c new file mode 100644 index 000000000000..53f0484c0845 --- /dev/null +++ b/drivers/iio/imu/inv_icm42607/inv_icm42607_temp.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2026 InvenSense, Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "inv_icm42607.h" +#include "inv_icm42607_temp.h" + +static int inv_icm42607_temp_read(struct inv_icm42607_state *st, s16 *temp) +{ + struct inv_icm42607_sensor_conf conf = INV_ICM42607_SENSOR_CONF_INIT; + struct device *dev = regmap_get_device(st->map); + int ret, gyro_mode, accel_mode; + unsigned int val; + u8 raw[2]; + + PM_RUNTIME_ACQUIRE_AUTOSUSPEND(dev, pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + guard(mutex)(&st->lock); + + /* + * Check if both the gyro and accel are off and if so, enable one + * of them. The temp sensor cannot be read if both the gyro and + * accel sensor are off. Prefer to enable the accel over the gyro + * as the datasheet says the gyro uses 5x more power and it has + * a minimum run time of 45ms. + */ + ret = regmap_read(st->map, INV_ICM42607_REG_PWR_MGMT0, &val); + if (ret) + return ret; + + accel_mode = FIELD_GET(INV_ICM42607_PWR_MGMT0_ACCEL_MODE_MASK, val); + gyro_mode = FIELD_GET(INV_ICM42607_PWR_MGMT0_GYRO_MODE_MASK, val); + if (!gyro_mode && !accel_mode) { + /* enable accel sensor */ + conf.mode = INV_ICM42607_SENSOR_MODE_LOW_NOISE; + ret = inv_icm42607_set_sensor_conf(st, &conf, IIO_ACCEL); + if (ret) + return ret; + } + + ret = regmap_bulk_read(st->map, INV_ICM42607_REG_TEMP_DATA1, + raw, sizeof(raw)); + if (ret) + return ret; + + *temp = get_unaligned_be16(raw); + if (*temp == INV_ICM42607_DATA_INVALID) + return -EINVAL; + + return 0; +} + +int inv_icm42607_temp_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct inv_icm42607_state *st = iio_device_get_drvdata(indio_dev); + s16 temp; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = inv_icm42607_temp_read(st, &temp); + if (ret) + return ret; + *val = temp; + return IIO_VAL_INT; + /* + * T°C = (temp / 128) + 25 + * Tm°C = 1000 * ((temp * 100 / 12800) + 25) + * scale: 100000 / 12800 ~= 7.8125 + * offset: 3200 + */ + case IIO_CHAN_INFO_SCALE: + *val = 7; + *val2 = 812500000; + return IIO_VAL_INT_PLUS_NANO; + case IIO_CHAN_INFO_OFFSET: + *val = 3200; + return IIO_VAL_INT; + default: + return -EINVAL; + } +} diff --git a/drivers/iio/imu/inv_icm42607/inv_icm42607_temp.h b/drivers/iio/imu/inv_icm42607/inv_icm42607_temp.h new file mode 100644 index 000000000000..18499b4d0b94 --- /dev/null +++ b/drivers/iio/imu/inv_icm42607/inv_icm42607_temp.h @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2026 InvenSense, Inc. + */ + +#ifndef INV_ICM42607_TEMP_H_ +#define INV_ICM42607_TEMP_H_ + +#include + +struct iio_dev; +struct iio_chan_spec; + +#define INV_ICM42607_TEMP_CHAN(_index) \ +{ \ + .type = IIO_TEMP, \ + .info_mask_separate = \ + BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_OFFSET) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_all = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .info_mask_shared_by_all_available = \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ + .scan_index = _index, \ + .scan_type = { \ + .sign = 's', \ + .realbits = 16, \ + .storagebits = 16, \ + .endianness = IIO_BE, \ + }, \ +} + +int inv_icm42607_temp_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask); + +#endif -- 2.43.0