linux-kernel - Re: [PATCH v2 5/9] iio: imu: st_lsm6dsx: remove event

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Message-ID: <aSAfT3OZRnaTtjXn@lore-desk>
Date: Fri, 21 Nov 2025 09:14:07 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Francesco Lavra <flavra@...libre.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/9] iio: imu: st_lsm6dsx: remove event_threshold
 field from hw struct

> 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@...libre.com>

Just a nit inline, fixing it:

Acked-by: Lorenzo Bianconi <lorenzo@...nel.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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