Re: [RFC PATCH 3/3] iio: imu: st_lsm6dsx: add wake on accelerometer threshold hook in sysfs

[Lorenzo Bianconi <lorenzo@kernel.org>]

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> This adds a wakeup threshold hook in sysfs, it enables us to
> change the threshold value on the run.
> For now this is the raw register value...
> 
> Signed-off-by: Sean Nyekjaer <sean@geanix.com>
> ---
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 34 ++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 

What about using write_event_config routine pointer for it instead od adding a sysfs
entries?
@Jonathan: what do you think?

Regards,
Lorenzo

> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index 2c8ad7d65d2f..cbcd7920f05d 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -657,12 +657,45 @@ static ssize_t st_lsm6dsx_sysfs_set_wakeup_enabled(struct device *dev,
>  	return len;
>  }
>  
> +static ssize_t st_lsm6dsx_sysfs_get_wakeup_threshold(struct device *dev,
> +					    struct device_attribute *attr,
> +					    char *buf)
> +{
> +	struct st_lsm6dsx_sensor *sensor = iio_priv(dev_get_drvdata(dev));
> +	struct st_lsm6dsx_hw *hw = sensor->hw;
> +
> +	return sprintf(buf, "%d\n", hw->wake_threshold);
> +}
> +
> +static ssize_t st_lsm6dsx_sysfs_set_wakeup_threshold(struct device *dev,
> +					    struct device_attribute *attr,
> +					    const char *buf, size_t len)
> +{
> +	struct st_lsm6dsx_sensor *sensor = iio_priv(dev_get_drvdata(dev));
> +	struct st_lsm6dsx_hw *hw = sensor->hw;
> +	int threshold;
> +
> +	if (kstrtoint(buf, 0, &threshold))
> +		return -EINVAL;
> +
> +	if ((threshold < 0) || (threshold > 31))
> +		return -EINVAL;
> +
> +	if (!st_lsm6dsx_set_wake_threshold(hw, threshold))
> +		return len;
> +
> +	return -EINVAL;
> +}
> +
>  static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(st_lsm6dsx_sysfs_sampling_frequency_avail);
>  static IIO_DEVICE_ATTR(in_accel_scale_available, 0444,
>  		       st_lsm6dsx_sysfs_scale_avail, NULL, 0);
>  static IIO_DEVICE_ATTR(wakeup_enabled, 0644,
>  		       st_lsm6dsx_sysfs_get_wakeup_enabled,
>  		       st_lsm6dsx_sysfs_set_wakeup_enabled, 0);
> +static IIO_DEVICE_ATTR(wakeup_threshold, 0644,
> +		       st_lsm6dsx_sysfs_get_wakeup_threshold,
> +		       st_lsm6dsx_sysfs_set_wakeup_threshold, 0);
>  static IIO_DEVICE_ATTR(in_anglvel_scale_available, 0444,
>  		       st_lsm6dsx_sysfs_scale_avail, NULL, 0);
>  
> @@ -670,6 +703,7 @@ static struct attribute *st_lsm6dsx_acc_attributes[] = {
>  	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
>  	&iio_dev_attr_in_accel_scale_available.dev_attr.attr,
>  	&iio_dev_attr_wakeup_enabled.dev_attr.attr,
> +	&iio_dev_attr_wakeup_threshold.dev_attr.attr,
>  	NULL,
>  };
>  
> -- 
> 2.22.0
> 

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