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Message-Id: <20250518111321.75226-13-l.rubusch@gmail.com>
Date: Sun, 18 May 2025 11:13:21 +0000
From: Lothar Rubusch <l.rubusch@...il.com>
To: jic23@...nel.org,
dlechner@...libre.com,
nuno.sa@...log.com,
andy@...nel.org,
corbet@....net,
lucas.p.stankus@...il.com,
lars@...afoo.de,
Michael.Hennerich@...log.com
Cc: linux-iio@...r.kernel.org,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
Lothar Rubusch <l.rubusch@...il.com>
Subject: [PATCH v1 12/12] docs: iio: add ADXL313 accelerometer
Add documentation for the ADXL313 accelerometer driver.
Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
---
Documentation/iio/adxl313.rst | 196 ++++++++++++++++++++++++++++++++++
Documentation/iio/index.rst | 1 +
2 files changed, 197 insertions(+)
create mode 100644 Documentation/iio/adxl313.rst
diff --git a/Documentation/iio/adxl313.rst b/Documentation/iio/adxl313.rst
new file mode 100644
index 000000000000..8c4e2d141594
--- /dev/null
+++ b/Documentation/iio/adxl313.rst
@@ -0,0 +1,196 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+===============
+ADXL313 driver
+===============
+
+This driver supports Analog Device's ADXL313 on SPI/I2C bus.
+
+1. Supported devices
+====================
+
+* `ADXL313 <https://www.analog.com/ADXL313>`_
+
+The ADXL313is a low noise density, low power, 3-axis accelerometer with
+selectable measurement ranges. The ADXL313 supports the ±0.5 g, ±1 g, ±2 g and
+±4 g ranges.
+
+2. Device attributes
+====================
+
+Accelerometer measurements are always provided.
+
+Temperature data are also provided. This data can be used to monitor the
+internal system temperature or to improve the temperature stability of the
+device via calibration.
+
+Each IIO device, has a device folder under ``/sys/bus/iio/devices/iio:deviceX``,
+where X is the IIO index of the device. Under these folders reside a set of
+device files, depending on the characteristics and features of the hardware
+device in questions. These files are consistently generalized and documented in
+the IIO ABI documentation.
+
+The following tables show the adxl313 related device files, found in the
+specific device folder path ``/sys/bus/iio/devices/iio:deviceX``.
+
++---------------------------------------------------+----------------------------------------------------------+
+| 3-Axis Accelerometer related device files | Description |
++---------------------------------------------------+----------------------------------------------------------+
+| in_accel_scale | Scale for the accelerometer channels. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_accel_x_calibbias | Calibration offset for the X-axis accelerometer channel. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_accel_x_raw | Raw X-axis accelerometer channel value. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_accel_y_calibbias | y-axis acceleration offset correction |
++---------------------------------------------------+----------------------------------------------------------+
+| in_accel_y_raw | Raw Y-axis accelerometer channel value. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_accel_z_calibbias | Calibration offset for the Z-axis accelerometer channel. |
++---------------------------------------------------+----------------------------------------------------------+
+| in_accel_z_raw | Raw Z-axis accelerometer channel value. |
++---------------------------------------------------+----------------------------------------------------------+
+
++---------------------------------------+----------------------------------------------+
+| Miscellaneous device files | Description |
++---------------------------------------+----------------------------------------------+
+| name | Name of the IIO device. |
++---------------------------------------+----------------------------------------------+
+| in_accel_sampling_frequency | Currently selected sample rate. |
++---------------------------------------+----------------------------------------------+
+| in_accel_sampling_frequency_available | Available sampling frequency configurations. |
++---------------------------------------+----------------------------------------------+
+
+Channels processed values
+-------------------------
+
+A channel value can be read from its _raw attribute. The value returned is the
+raw value as reported by the devices. To get the processed value of the channel,
+apply the following formula:
+
+.. code-block:: bash
+
+ processed value = (_raw + _offset) * _scale
+
+Where _offset and _scale are device attributes. If no _offset attribute is
+present, simply assume its value is 0.
+
+The ADXL313 driver offers data for a single types of channels, the table below
+shows the measurement units for the processed value, which are defined by the
+IIO framework:
+
++-------------------------------------+---------------------------+
+| Channel type | Measurement unit |
++-------------------------------------+---------------------------+
+| Acceleration on X, Y, and Z axis | Meters per Second squared |
++-------------------------------------+---------------------------+
+
+Usage examples
+--------------
+
+Show device name:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> cat name
+ adxl313
+
+Show accelerometer channels value:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_x_raw
+ 2
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_y_raw
+ -57
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_z_raw
+ 2
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_scale
+ 0.009576806
+
+- X-axis acceleration = in_accel_x_raw * in_accel_scale = 0.0191536 m/s^2
+- Y-axis acceleration = in_accel_y_raw * in_accel_scale = -0.5458779 m/s^2
+- Z-axis acceleration = in_accel_z_raw * in_accel_scale = 0.0191536 m/s^2
+
+Set calibration offset for accelerometer channels. Note, the calibration will be
+rounded according to the graduation of LSB units:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_x_calibbias
+ 0
+
+ root:/sys/bus/iio/devices/iio:device0> echo 50 > in_accel_x_calibbias
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_x_calibbias
+ 48
+
+Set sampling frequency:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_sampling_frequency
+ 100.000000
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_sampling_frequency_available
+ 6.250000 12.500000 25.000000 50.000000 100.000000 200.000000 400.000000 800.000000 1600.000000 3200.000000
+
+ root:/sys/bus/iio/devices/iio:device0> echo 400 > in_accel_sampling_frequency
+ root:/sys/bus/iio/devices/iio:device0> cat in_accel_sampling_frequency
+ 400.000000
+
+3. Device buffers
+=================
+
+This driver supports IIO buffers.
+
+All devices support retrieving the raw acceleration measurements using buffers.
+
+Usage examples
+--------------
+
+Select channels for buffer read:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > scan_elements/in_accel_x_en
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > scan_elements/in_accel_y_en
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > scan_elements/in_accel_z_en
+
+Set the number of samples to be stored in the buffer:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> echo 10 > buffer/length
+
+Enable buffer readings:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> echo 1 > buffer/enable
+
+Obtain buffered data:
+
+.. code-block:: bash
+
+ root:/sys/bus/iio/devices/iio:device0> hexdump -C /dev/iio\:device0
+ ...
+ 000000d0 01 fc 31 00 c7 ff 03 fc 31 00 c7 ff 04 fc 33 00 |..1.....1.....3.|
+ 000000e0 c8 ff 03 fc 32 00 c5 ff ff fc 32 00 c7 ff 0a fc |....2.....2.....|
+ 000000f0 30 00 c8 ff 06 fc 33 00 c7 ff 01 fc 2f 00 c8 ff |0.....3...../...|
+ 00000100 02 fc 32 00 c6 ff 04 fc 33 00 c8 ff 05 fc 33 00 |..2.....3.....3.|
+ 00000110 ca ff 02 fc 31 00 c7 ff 02 fc 30 00 c9 ff 09 fc |....1.....0.....|
+ 00000120 35 00 c9 ff 08 fc 35 00 c8 ff 02 fc 31 00 c5 ff |5.....5.....1...|
+ 00000130 03 fc 32 00 c7 ff 04 fc 32 00 c7 ff 02 fc 31 00 |..2.....2.....1.|
+ 00000140 c7 ff 08 fc 30 00 c7 ff 02 fc 32 00 c5 ff ff fc |....0.....2.....|
+ 00000150 31 00 c5 ff 04 fc 31 00 c8 ff 03 fc 32 00 c8 ff |1.....1.....2...|
+ 00000160 01 fc 31 00 c7 ff 05 fc 31 00 c3 ff 04 fc 31 00 |..1.....1.....1.|
+ 00000170 c5 ff 04 fc 30 00 c7 ff 03 fc 31 00 c9 ff 03 fc |....0.....1.....|
+ ...
+
+See ``Documentation/iio/iio_devbuf.rst`` for more information about how buffered
+data is structured.
+
+4. IIO Interfacing Tools
+========================
+
+See ``Documentation/iio/iio_tools.rst`` for the description of the available IIO
+interfacing tools.
diff --git a/Documentation/iio/index.rst b/Documentation/iio/index.rst
index 2d6afc5a8ed5..c106402a91f7 100644
--- a/Documentation/iio/index.rst
+++ b/Documentation/iio/index.rst
@@ -31,6 +31,7 @@ Industrial I/O Kernel Drivers
adis16475
adis16480
adis16550
+ adxl313
adxl380
bno055
ep93xx_adc
--
2.39.5
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