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Sun, 01 Feb 2026 10:33:49 -0800 (PST) From: Taha Ed-Dafili <0rayn.dev@gmail.com> To: jic23@kernel.org Cc: me@brighamcampbell.com, skhan@linuxfoundation.org, linux-kernel-mentees-archive@lists.linuxfoundation.org, rdunlap@infradead.org, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, corbet@lwn.net, lars@metafoo.de, Michael.Hennerich@analog.com, linux-iio@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Taha Ed-Dafili <0rayn.dev@gmail.com> Subject: [PATCH v2 3/4] iio: accel: adxl345: Implement event scaling for ABI compliance Date: Sun, 1 Feb 2026 13:33:12 -0500 Message-ID: <20260201183320.27023-4-0rayn.dev@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260201183320.27023-1-0rayn.dev@gmail.com> References: <20260201183320.27023-1-0rayn.dev@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The ADXL345 uses a fixed threshold resolution of 62.5 mg/LSB for event-related registers. Previously, the driver reported raw values without a scale factor. Implement IIO_EV_INFO_SCALE for all event types to provide the conversion factor (0.612915 m/s^2) as required by the IIO ABI. Suggested-by: Jonathan Cameron Signed-off-by: Taha Ed-Dafili <0rayn.dev@gmail.com> --- drivers/iio/accel/adxl345_core.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-) diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c index 78e3f799ecc1..dfe3169ffc5f 100644 --- a/drivers/iio/accel/adxl345_core.c +++ b/drivers/iio/accel/adxl345_core.c @@ -212,7 +212,8 @@ static const struct iio_event_spec adxl345_events[] = { .type = IIO_EV_TYPE_MAG, .dir = IIO_EV_DIR_RISING, .mask_shared_by_type = - BIT(IIO_EV_INFO_ENABLE) | + BIT(IIO_EV_INFO_ENABLE) | + BIT(IIO_EV_INFO_SCALE) | BIT(IIO_EV_INFO_VALUE), }, { @@ -221,6 +222,7 @@ static const struct iio_event_spec adxl345_events[] = { .dir = IIO_EV_DIR_RISING, .mask_shared_by_type = BIT(IIO_EV_INFO_ENABLE) | + BIT(IIO_EV_INFO_SCALE) | BIT(IIO_EV_INFO_VALUE), }, { @@ -228,15 +230,19 @@ static const struct iio_event_spec adxl345_events[] = { .type = IIO_EV_TYPE_GESTURE, .dir = IIO_EV_DIR_SINGLETAP, .mask_separate = BIT(IIO_EV_INFO_ENABLE), - .mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) | + .mask_shared_by_type = + BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_SCALE) | BIT(IIO_EV_INFO_TIMEOUT), }, { /* double tap */ .type = IIO_EV_TYPE_GESTURE, .dir = IIO_EV_DIR_DOUBLETAP, - .mask_shared_by_type = BIT(IIO_EV_INFO_ENABLE) | - BIT(IIO_EV_INFO_RESET_TIMEOUT) | + .mask_shared_by_type = + BIT(IIO_EV_INFO_ENABLE) | + BIT(IIO_EV_INFO_RESET_TIMEOUT) | + BIT(IIO_EV_INFO_SCALE) | BIT(IIO_EV_INFO_TAP2_MIN_DELAY), }, }; @@ -274,7 +280,8 @@ static const struct iio_event_spec adxl345_fake_chan_events[] = { .dir = IIO_EV_DIR_FALLING, .mask_separate = BIT(IIO_EV_INFO_ENABLE), .mask_shared_by_type = - BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_SCALE) | BIT(IIO_EV_INFO_PERIOD), }, { @@ -283,7 +290,8 @@ static const struct iio_event_spec adxl345_fake_chan_events[] = { .dir = IIO_EV_DIR_FALLING, .mask_separate = BIT(IIO_EV_INFO_ENABLE), .mask_shared_by_type = - BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_VALUE) | + BIT(IIO_EV_INFO_SCALE) | BIT(IIO_EV_INFO_PERIOD), }, }; @@ -1367,6 +1375,14 @@ static int adxl345_read_event_value(struct iio_dev *indio_dev, return ret; *val = sign_extend32(tap_threshold, 7); return IIO_VAL_INT; + case IIO_EV_INFO_SCALE: + /* + * The event threshold LSB is fixed at 62.5 mg/LSB + * 0.0625 * 9.80665 = 0.612915625 m/s^2 + */ + *val = 0; + *val2 = 612915; + return IIO_VAL_INT_PLUS_MICRO; case IIO_EV_INFO_TIMEOUT: *val = st->tap_duration_us; *val2 = MICRO; -- 2.47.3