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linux/Documentation/iio/ade9000.rst
Antoniu Miclaus 942ab02bc9 docs: iio: add documentation for ade9000 driver 
Add documentation for ade9000 driver which describes the driver
device files and shows how the user may use the ABI for various
scenarios (configuration, measurement, etc.).

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2025-09-13 14:20:44 +01:00

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.. SPDX-License-Identifier: GPL-2.0
===============
ADE9000 driver
===============
This driver supports Analog Device's ADE9000 energy measurement IC on SPI bus.
1. Supported devices
====================
* `ADE9000 <https://www.analog.com/media/en/technical-documentation/data-sheets/ADE9000.pdf>`_
The ADE9000 is a highly accurate, fully integrated, multiphase energy and power
quality monitoring device. Superior analog performance and a digital signal
processing (DSP) core enable accurate energy monitoring over a wide dynamic
range. An integrated high end reference ensures low drift over temperature
with a combined drift of less than ±25 ppm/°C maximum for the entire channel
including a programmable gain amplifier (PGA) and an analog-to-digital
converter (ADC).
2. Device attributes
====================
Power and energy measurements are provided for voltage, current, active power,
reactive power, apparent power, and power factor across three phases.
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 question. These files are consistently generalized and documented in
the IIO ABI documentation.
The following tables show the ADE9000 related device files, found in the
specific device folder path ``/sys/bus/iio/devices/iio:deviceX``.
+---------------------------------------------------+----------------------------------------------------------+
| Current measurement related device files | Description |
+---------------------------------------------------+----------------------------------------------------------+
| in_current[0-2]_raw | Raw current measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_current[0-2]_scale | Scale for current channels. |
+---------------------------------------------------+----------------------------------------------------------+
| in_current[0-2]_calibscale | Calibration gain for current channels (AIGAIN reg). |
+---------------------------------------------------+----------------------------------------------------------+
| in_altcurrent[0-2]_rms_raw | RMS current measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_altcurrent[0-2]_rms_scale | Scale for RMS current channels. |
+---------------------------------------------------+----------------------------------------------------------+
| in_altcurrent[0-2]_rms_calibbias | RMS offset correction for current channels (IRMSOS reg). |
+---------------------------------------------------+----------------------------------------------------------+
+---------------------------------------------------+----------------------------------------------------------+
| Voltage measurement related device files | Description |
+---------------------------------------------------+----------------------------------------------------------+
| in_voltage[0-2]_raw | Raw voltage measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_voltage[0-2]_scale | Scale for voltage channels. |
+---------------------------------------------------+----------------------------------------------------------+
| in_voltage[0-2]_calibscale | Calibration gain for voltage channels (AVGAIN reg). |
+---------------------------------------------------+----------------------------------------------------------+
| in_voltage[0-2]_frequency | Measured line frequency from instantaneous voltage. |
+---------------------------------------------------+----------------------------------------------------------+
| in_altvoltage[0-2]_rms_raw | RMS voltage measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_altvoltage[0-2]_rms_scale | Scale for RMS voltage channels. |
+---------------------------------------------------+----------------------------------------------------------+
| in_altvoltage[0-2]_rms_calibbias | RMS offset correction for voltage channels (VRMSOS reg). |
+---------------------------------------------------+----------------------------------------------------------+
+---------------------------------------------------+----------------------------------------------------------+
| Power measurement related device files | Description |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_active_raw | Active power measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_active_scale | Scale for active power channels. |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_active_calibbias | Calibration offset for active power (xWATTOS regs). |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_active_calibscale | Calibration gain for active power (APGAIN reg). |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_reactive_raw | Reactive power measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_reactive_scale | Scale for reactive power channels. |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_reactive_calibbias | Calibration offset for reactive power (xVAROS regs). |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_apparent_raw | Apparent power measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_apparent_scale | Scale for apparent power channels. |
+---------------------------------------------------+----------------------------------------------------------+
| in_power[0-2]_powerfactor | Power factor for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
+---------------------------------------------------+----------------------------------------------------------+
| Energy measurement related device files | Description |
+---------------------------------------------------+----------------------------------------------------------+
| in_energy[0-2]_active_raw | Active energy measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_energy[0-2]_reactive_raw | Reactive energy measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
| in_energy[0-2]_apparent_raw | Apparent energy measurement for phases A, B, C. |
+---------------------------------------------------+----------------------------------------------------------+
+------------------------------+------------------------------------------------------------------+
| Shared device attributes | Description |
+------------------------------+------------------------------------------------------------------+
| name | Name of the IIO device. |
+------------------------------+------------------------------------------------------------------+
| filter_type | Waveform buffer filter type (sinc4, sinc4+lp). |
+------------------------------+------------------------------------------------------------------+
| filter_type_available | Available filter types for waveform buffer. |
+------------------------------+------------------------------------------------------------------+
3. Calibration and scaling
===========================
The ADE9000 provides multiple levels of gain and offset correction:
**Calibration Gain (per-channel)**
Fine-tuning calibration gains applied in the digital domain for each channel type.
Controlled via ``calibscale`` attributes (AIGAIN, AVGAIN, APGAIN registers).
**Calibration Bias (per-channel)**
Hardware calibration offsets applied by the device internally:
- Power measurements: Controlled via ``calibbias`` attributes for power channels (xWATTOS, xVAROS registers).
- RMS measurements: Controlled via ``calibbias`` attributes for RMS channels (IRMSOS, VRMSOS registers).
These are internal chip calibrations, not userspace-applied offsets.
4. Event attributes
===================
The ADE9000 provides various interrupts that are mapped to IIO events.
Event functionality is only available if the corresponding interrupts are
connected in the device tree.
+---------------------------------------------------+----------------------------------------------------------+
| IIO Event Attribute | ADE9000 Datasheet Equivalent |
+---------------------------------------------------+----------------------------------------------------------+
| in_voltage[0-2]_thresh_either_en | Zero crossing detection interrupt (ZXVx) |
+---------------------------------------------------+----------------------------------------------------------+
| in_altvoltage[0-2]_rms_thresh_rising_en | RMS swell detection interrupt (SWELLx) |
+---------------------------------------------------+----------------------------------------------------------+
| in_altvoltage[0-2]_rms_thresh_rising_value | RMS swell threshold (SWELL_LVL register) |
+---------------------------------------------------+----------------------------------------------------------+
| in_altvoltage[0-2]_rms_thresh_falling_en | RMS sag/dip detection interrupt (DIPx) |
+---------------------------------------------------+----------------------------------------------------------+
| in_altvoltage[0-2]_rms_thresh_falling_value | RMS sag/dip threshold (DIP_LVL register) |
+---------------------------------------------------+----------------------------------------------------------+
| in_current[0-2]_thresh_either_en | Current zero crossing detection interrupt (ZXIx) |
+---------------------------------------------------+----------------------------------------------------------+
Event directions:
- ``rising``: Upper threshold crossing (swell detection)
- ``falling``: Lower threshold crossing (sag/dip detection)
- ``either``: Any threshold crossing (zero crossing detection)
- ``none``: Timeout or non-directional events
**Note**: Event attributes are only available if the corresponding interrupts
(irq0, irq1, dready) are specified in the device tree. The driver works without
interrupts but with reduced functionality.
5. Device buffers
=================
This driver supports IIO buffers for waveform capture. Buffer functionality
requires the dready interrupt to be connected.
The device supports capturing voltage and current waveforms for power quality
analysis. The waveform buffer can be configured to capture data from different
channel combinations.
Supported channel combinations for buffered capture:
- Phase A: voltage and current (IA + VA)
- Phase B: voltage and current (IB + VB)
- Phase C: voltage and current (IC + VC)
- All phases: all voltage and current channels
- Individual channels: IA, VA, IB, VB, IC, VC
Usage examples
--------------
Enable waveform capture for Phase A:
.. code-block:: bash
root:/sys/bus/iio/devices/iio:device0> echo 1 > scan_elements/in_current0_en
root:/sys/bus/iio/devices/iio:device0> echo 1 > scan_elements/in_voltage0_en
Set buffer length and enable:
.. code-block:: bash
root:/sys/bus/iio/devices/iio:device0> echo 100 > buffer/length
root:/sys/bus/iio/devices/iio:device0> echo 1 > buffer/enable
6. Clock output
===============
The ADE9000 can provide a clock output via the CLKOUT pin when using an external
crystal/clock source. This feature is enabled by specifying ``#clock-cells = <0>``
in the device tree. The output clock will be registered as "clkout" and can be
referenced by other devices.
7. Usage examples
=================
Show device name:
.. code-block:: bash
root:/sys/bus/iio/devices/iio:device0> cat name
ade9000
Read voltage measurements:
.. code-block:: bash
root:/sys/bus/iio/devices/iio:device0> cat in_voltage0_raw
12345
root:/sys/bus/iio/devices/iio:device0> cat in_voltage0_scale
0.000030517
- Phase A voltage = in_voltage0_raw * in_voltage0_scale = 0.3769 V
Read power measurements:
.. code-block:: bash
root:/sys/bus/iio/devices/iio:device0> cat in_power0_active_raw
5678
root:/sys/bus/iio/devices/iio:device0> cat in_power0_scale
0.000244140
- Phase A active power = in_power0_active_raw * in_power0_scale = 1.386 W
Configure calibration gains:
.. code-block:: bash
# Set current channel 0 calibration gain
root:/sys/bus/iio/devices/iio:device0> echo 0x800000 > in_current0_calibscale
# Set voltage channel 0 calibration gain
root:/sys/bus/iio/devices/iio:device0> echo 0x7FFFFF > in_voltage0_calibscale
Configure RMS voltage event thresholds (requires interrupts):
.. code-block:: bash
# Set RMS sag detection threshold
root:/sys/bus/iio/devices/iio:device0> echo 180000 > events/in_altvoltage0_rms_thresh_falling_value
# Enable RMS sag detection
root:/sys/bus/iio/devices/iio:device0> echo 1 > events/in_altvoltage0_rms_thresh_falling_en
# Set RMS swell detection threshold
root:/sys/bus/iio/devices/iio:device0> echo 260000 > events/in_altvoltage0_rms_thresh_rising_value
# Enable RMS swell detection
root:/sys/bus/iio/devices/iio:device0> echo 1 > events/in_altvoltage0_rms_thresh_rising_en
8. IIO Interfacing Tools
========================
See ``Documentation/iio/iio_tools.rst`` for the description of the available IIO
interfacing tools.
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