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