Re: [PATCH v2 5/9] iio: imu: st_lsm6dsx: remove event_threshold field from hw struct

Lorenzo Bianconi
2025-11-21T08:14:10Z

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> This field is used to store the wakeup event detection threshold value.
> When adding support for more event types, some of which may have different
> threshold values for different axes, storing all threshold values for all
> event sources would be cumbersome. Thus, remove this field altogether, and
> read the currently configured value from the sensor when requested by
> userspace.
>
> Signed-off-by: Francesco Lavra <flavra@baylibre.com>

Just a nit inline, fixing it:

Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>

> ---
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h | 3 +--
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 12 +++++++++---
> 2 files changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> index bbb967b2754b..e727a87413e5 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
> @@ -79,6 +79,7 @@ enum st_lsm6dsx_hw_id {
> #define ST_LSM6DSX_MAX_TAGGED_WORD_LEN ((32 / ST_LSM6DSX_TAGGED_SAMPLE_SIZE) \
> * ST_LSM6DSX_TAGGED_SAMPLE_SIZE)
> #define ST_LSM6DSX_SHIFT_VAL(val, mask) (((val) << __ffs(mask)) & (mask))
> +#define st_lsm6dsx_field_get(mask, reg) ((reg & mask) >> __ffs(mask))

To be aligned with the rest of the code, I guess we could use capital letters
here:

#define ST_LSM6DSX_FIELD_GET(mask, reg)▸ ((reg & mask) >> __ffs(mask))

>
> #define ST_LSM6DSX_CHANNEL_ACC(chan_type, addr, mod, scan_idx) \
> { \
> @@ -422,7 +423,6 @@ struct st_lsm6dsx_sensor {
> * @sip: Total number of samples (acc/gyro/ts) in a given pattern.
> * @buff: Device read buffer.
> * @irq_routing: pointer to interrupt routing configuration.
> - * @event_threshold: wakeup event threshold.
> * @enable_event: enabled event bitmask.
> * @iio_devs: Pointers to acc/gyro iio_dev instances.
> * @settings: Pointer to the specific sensor settings in use.
> @@ -446,7 +446,6 @@ struct st_lsm6dsx_hw {
> u8 sip;
>
> u8 irq_routing;
> - u8 event_threshold;
> u8 enable_event;
>
> u8 *buff;
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 287a85d4bd58..117ecb080d8e 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -1900,12 +1900,20 @@ static int st_lsm6dsx_read_event(struct iio_dev *iio_dev,
> {
> struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
> struct st_lsm6dsx_hw *hw = sensor->hw;
> + const struct st_lsm6dsx_reg *reg;
> + u8 data;
> + int err;
>
> if (type != IIO_EV_TYPE_THRESH)
> return -EINVAL;
>
> + reg = &hw->settings->event_settings.sources[ST_LSM6DSX_EVENT_WAKEUP].value;
> + err = st_lsm6dsx_read_locked(hw, reg->addr, &data, sizeof(data));
> + if (err < 0)
> + return err;
> +
> *val2 = 0;
> - *val = hw->event_threshold;
> + *val = st_lsm6dsx_field_get(reg->mask, data);
>
> return IIO_VAL_INT;
> }
> @@ -1937,8 +1945,6 @@ st_lsm6dsx_write_event(struct iio_dev *iio_dev,
> if (err < 0)
> return -EINVAL;
>
> - hw->event_threshold = val;
> -
> return 0;
> }
>
> --
> 2.39.5
>

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