linux-kernel - Re: [PATCH v3 09/15] iio: accel: adxl345: add freefall feature

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Message-ID: <20250304132320.5caad2d2@jic23-huawei>
Date: Tue, 4 Mar 2025 13:23:19 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Lothar Rubusch <l.rubusch@...il.com>
Cc: lars@...afoo.de, Michael.Hennerich@...log.com,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 eraretuya@...il.com
Subject: Re: [PATCH v3 09/15] iio: accel: adxl345: add freefall feature

On Thu, 20 Feb 2025 10:42:28 +0000
Lothar Rubusch <l.rubusch@...il.com> wrote:

> Add the freefall detection of the sensor together with a threshold and
> time parameter. A freefall event is detected if the measuring signal
> falls below the threshold.
> 
> Introduce a freefall threshold stored in regmap cache, and a freefall
> time, having the scaled time value stored as a member variable in the
> state instance.
> 
> Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
Hi, one thing inline.

> @@ -855,6 +958,17 @@ static int adxl345_push_event(struct iio_dev *indio_dev, int int_stat,
>  			return ret;
>  	}
>  
> +	if (FIELD_GET(ADXL345_INT_FREE_FALL, int_stat)) {
> +		ret = iio_push_event(indio_dev,
> +				     IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
> +							IIO_MOD_X_OR_Y_OR_Z,
> +							IIO_EV_TYPE_MAG,
> +							IIO_EV_DIR_FALLING),
> +				     ts);
> +		if (ret)
> +			return ret;
> +	}
> +

Seems unlikely to be right. Pushed an event without error yet this function
is returning an error here?

>  	return -ENOENT;
>  }
>  
> @@ -954,6 +1068,7 @@ int adxl345_core_probe(struct device *dev, struct regmap *regmap,
>  					 ADXL345_DATA_FORMAT_FULL_RES |
>  					 ADXL345_DATA_FORMAT_SELF_TEST);
>  	unsigned int tap_threshold;
> +	unsigned int ff_threshold;
>  	int ret;
>  
>  	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
> @@ -973,6 +1088,9 @@ int adxl345_core_probe(struct device *dev, struct regmap *regmap,
>  	st->tap_window_us = 64;			/*   64 [0x40] -> .080    */
>  	st->tap_latent_us = 16;			/*   16 [0x10] -> .020    */
>  
> +	ff_threshold = 8;			/*    8 [0x08]            */
> +	st->ff_time_ms = 32;			/*   32 [0x20] -> 0.16    */
> +
>  	indio_dev->name = st->info->name;
>  	indio_dev->info = &adxl345_info;
>  	indio_dev->modes = INDIO_DIRECT_MODE;
> @@ -1049,6 +1167,10 @@ int adxl345_core_probe(struct device *dev, struct regmap *regmap,
>  		if (ret)
>  			return ret;
>  
> +		ret = regmap_write(st->regmap, ADXL345_REG_THRESH_FF, ff_threshold);
> +		if (ret)
> +			return ret;
> +
>  		/* FIFO_STREAM mode is going to be activated later */
>  		ret = devm_iio_kfifo_buffer_setup(dev, indio_dev, &adxl345_buffer_ops);
>  		if (ret)