Re: [PATCH v1 09/12] iio: accel: adxl345: add double tap suppress bit

[Jonathan Cameron <jic23@kernel.org>]

On Tue, 28 Jan 2025 12:00:57 +0000
Lothar Rubusch <l.rubusch@gmail.com> wrote:

> Add the suppress bit feature to make double tap (in)sensitive to the
> configured threshold value for the tap feature. The feature is being
> enabled by a sysfs handle for enabling. This is also needed for further
> features in follow up patches.
> 
> Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com>

Why would you change this?  From that description it sounds like this
should always be enabled or disabled (I'm not entirely sure). Not
something I'd expect a user to actually tweak.

Anyhow, new ABI. docs missing so hard to know what this is.

> ---
>  drivers/iio/accel/adxl345_core.c | 67 ++++++++++++++++++++++++++++++++
>  1 file changed, 67 insertions(+)
> 
> diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
> index f9e5f47ba303..ef0a12fd59be 100644
> --- a/drivers/iio/accel/adxl345_core.c
> +++ b/drivers/iio/accel/adxl345_core.c
> @@ -120,6 +120,7 @@
>  #define ADXL345_INT2			1
>  
>  #define ADXL345_REG_TAP_AXIS_MSK	GENMASK(2, 0)
> +#define ADXL345_REG_TAP_SUPPRESS_MSK	BIT(3)
>  
>  enum adxl345_axis {
>  	ADXL345_Z_EN = BIT(0),
> @@ -167,6 +168,7 @@ struct adxl345_state {
>  	u32 tap_duration_us;
>  	u32 tap_latent_us;
>  	u32 tap_window_us;
> +	bool tap_suppressed;
>  
>  	__le16 fifo_buf[ADXL345_DIRS * ADXL345_FIFO_SIZE + 1] __aligned(IIO_DMA_MINALIGN);
>  };
> @@ -346,6 +348,22 @@ static int adxl345_set_doubletap_en(struct adxl345_state *st, bool en)
>  	return _adxl345_set_tap_int(st, ADXL345_DOUBLE_TAP, en);
>  }
>  
> +static int adxl345_is_suppressed_en(struct adxl345_state *st, bool *en)
> +{
> +	*en = st->tap_suppressed;
> +
> +	return 0;
> +}
> +
> +static int adxl345_set_suppressed_en(struct adxl345_state *st, bool en)
> +{
> +	st->tap_suppressed = en;
> +
> +	return regmap_update_bits(st->regmap, ADXL345_REG_TAP_AXIS,
> +				  ADXL345_REG_TAP_SUPPRESS_MSK,
> +				  en ? ADXL345_TAP_SUPPRESS : ~ADXL345_TAP_SUPPRESS);
> +}
> +
>  static int adxl345_set_tap_value(struct adxl345_state *st, u8 val)
>  {
>  	st->tap_threshold = val;
> @@ -693,6 +711,52 @@ static int adxl345_write_raw_get_fmt(struct iio_dev *indio_dev,
>  	}
>  }
>  
> +#define ADXL345_generate_iio_dev_attr_EN(A, B)				\
> +	static ssize_t in_accel_##A##_##B##_en_show(struct device *dev, \
> +						    struct device_attribute *attr, \
> +						    char *buf)		\
> +	{								\
> +		struct iio_dev *indio_dev = dev_to_iio_dev(dev);	\
> +		struct adxl345_state *st = iio_priv(indio_dev);		\
> +		bool en;						\
> +		int val, ret;						\
> +									\
> +		ret = adxl345_is_##B##_en(st, &en);			\
> +		if (ret)						\
> +			return ret;					\
> +		val = en ? 1 : 0;					\
> +									\
> +		return iio_format_value(buf, IIO_VAL_INT, 1, &val);	\
> +	}								\
> +									\
> +	static ssize_t in_accel_##A##_##B##_en_store(struct device *dev, \
> +						     struct device_attribute *attr, \
> +						     const char *buf, size_t len) \
> +	{								\
> +		struct iio_dev *indio_dev = dev_to_iio_dev(dev);	\
> +		struct adxl345_state *st = iio_priv(indio_dev);		\
> +		int val, ret;						\
> +									\
> +		ret = kstrtoint(buf, 0, &val);				\
> +		if (ret)						\
> +			return ret;					\
> +									\
> +		ret = adxl345_set_measure_en(st, false);		\
> +		if (ret)						\
> +			return ret;					\
> +									\
> +		ret = adxl345_set_##B##_en(st, val > 0);		\
> +		if (ret)						\
> +			return ret;					\
> +									\
> +		ret =  adxl345_set_measure_en(st, true);		\
> +		if (ret)						\
> +			return ret;					\
> +									\
> +		return len;						\
> +	}								\
> +	static IIO_DEVICE_ATTR_RW(in_accel_##A##_##B##_en, 0)
> +
>  #define ADXL345_generate_iio_dev_attr_FRACTIONAL(A, B, C, D, E)		\
>  	static ssize_t in_accel_##A##_##C##_##E##_show(struct device *dev, \
>  						       struct device_attribute *attr, \
> @@ -738,8 +802,11 @@ ADXL345_generate_iio_dev_attr_FRACTIONAL(gesture_singletap, tap, duration, MICRO
>  ADXL345_generate_iio_dev_attr_FRACTIONAL(gesture_doubletap, tap, window, MICRO, us);
>  ADXL345_generate_iio_dev_attr_FRACTIONAL(gesture_doubletap, tap, latent, MICRO, us);
>  
> +ADXL345_generate_iio_dev_attr_EN(gesture_doubletap, suppressed);
> +
>  static struct attribute *adxl345_event_attrs[] = {
>  	&iio_dev_attr_in_accel_gesture_singletap_duration_us.dev_attr.attr,
> +	&iio_dev_attr_in_accel_gesture_doubletap_suppressed_en.dev_attr.attr,
>  	&iio_dev_attr_in_accel_gesture_doubletap_latent_us.dev_attr.attr,
>  	&iio_dev_attr_in_accel_gesture_doubletap_window_us.dev_attr.attr,
>  	NULL