The AD4170-4 is a multichannel, low noise, 24-bit precision sigma-delta
analog to digital converter. The AD4170-4 design offers a flexible data
acquisition solution with crosspoint multiplexed analog inputs,
configurable ADC voltage reference inputs, ultra-low noise integrated PGA,
digital filtering, wide range of configurable output data rates, internal
oscillator and temperature sensor, four GPIOs, and integrated features for
interfacing with load cell weigh scales, RTD, and thermocouple sensors.
Add basic support for the AD4170-4 ADC with the following features:
- Single-shot read.
- Analog front end PGA configuration.
- Differential and pseudo-differential input configuration.
iio: imu: inv_icm42600: reorganize DMA aligned buffers in structure
Move all DMA aligned buffers together at the end of the structure.
1. Timestamp anynomous structure is not used with DMA so it doesn't
belong after __aligned(IIO_DMA_MINALIGN).
2. struct inv_icm42600_fifo contains it's own __aligned(IIO_DMA_MINALIGN)
within it at the end so it should not be after __aligned(IIO_DMA_MINALIGN)
in the outer struct either.
3. Normally 1 would have been considered a bug, but because of the extra
alignment from 2, it actually was OK, but we shouldn't be relying on such
quirks.
Refactor the sensor interrupt mapping by utilizing regmap_assign_bits(),
which accepts a boolean value directly. Introduce a helper function to
streamline the identification of the configured interrupt line pin. Also,
use identifiers from units.h to represent the full 8-bit register when
setting bits.
This is a purely refactoring change and does not affect functionality.
iio: accel: adxl313: add AC coupled activity/inactivity events
Introduce AC-coupled activity and inactivity as MAG_ADAPTIVE events.
This adds a new set of threshold and duration configuration options,
ensures proper handling of event disabling, and extends the use of the
link bit to support complementary event configurations.
For example, either ACTIVITY or ACTIVITY_AC can be enabled, but only the
most recently set configuration will remain active. Disabling ACTIVITY
will have no effect if ACTIVITY_AC is currently enabled, as the event
types must match (i.e., ACTIVITY_AC must be explicitly disabled). When
either INACTIVITY or INACTIVITY_AC is enabled alongside an activity
event, the link bit is set.
With the link bit and auto-sleep enabled, activity and inactivity events
represent changes in the sensor's power-saving state and are only
triggered upon actual state transitions. Since AC coupling uses separate
bits for activity and inactivity, each can be configured independently.
For instance, ACTIVITY can be linked with INACTIVITY_AC.
If one of the linked events is disabled, the link bit is cleared. In
that case, the remaining event will no longer reflect a state transition
but will instead trigger based on periodic inactivity or whenever the
activity threshold is exceeded.
iio: accel: adxl313: implement power-save on inactivity
Configure the link bit to associate activity and inactivity sensing,
allowing the sensor to reflect its internal power-saving state.
Additionally, enable the auto-sleep bit to transition the sensor into
auto-sleep mode during periods of inactivity, as outlined in the
datasheet.
Enhance the interrupt handler to process inactivity events. Introduce
functions to configure the threshold and period registers for
inactivity detection, as well as to enable or disable the inactivity
feature. Extend the fake IIO channel to handle inactivity events by
combining the x, y, and z axes using a logical AND operation.
Add support for configuring an activity detection threshold. Extend the
interrupt handler to process activity-related interrupts, and provide
functions to set the threshold as well as to enable or disable activity
sensing. Additionally, introduce a virtual channel that represents the
logical AND of the x, y, and z axes in the IIO channel.
This patch serves as a preparatory step; some definitions and functions
introduced here are intended to be extended later to support inactivity
detection.
iio: accel: adxl313: add buffered FIFO watermark with interrupt handling
Cover the following tasks:
- Add scan_mask and scan_index to the IIO channel configuration. The
scan_index sets up buffer usage. According to the datasheet, the ADXL313
uses a 13-bit wide data field in full-resolution mode. Set the
signedness, number of storage bits, and endianness accordingly.
- Parse the devicetree for an optional interrupt line and configure the
interrupt mapping based on its presence. If no interrupt line is
specified, keep the FIFO in bypass mode as currently implemented.
- Set up the interrupt handler. Add register access to detect and
evaluate interrupts. Implement functions to clear status registers and
reset the FIFO.
- Implement FIFO watermark configuration and handling. Allow the
watermark level to be set, evaluate the corresponding interrupt, read
the FIFO contents, and push the data to the IIO channel.
iio: accel: adxl313: add function to enable measurement
Refactor the control of measurement and standby modes for the sensor.
Instead of directly writing to the register, encapsulate this operation
in a dedicated function that handles enabling and disabling measurement.
This approach will reduce code duplication wherever sensor configuration
changes are required. In subsequent patches, measurement mode will be
set to standby as part of this process.
Additionally, simplify the control mask to include only the measurement
bit. The sleep bit governs a different behavior—putting the sensor into
sleep mode, not just standby for configuration—and is currently unused.
Therefore, there's no need to include both the sleep and measurement
bits in the same mask.
Reviewed-by: Andy Shevchenko <andy@kernel.org> Signed-off-by: Lothar Rubusch <l.rubusch@gmail.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/20250702230819.19353-3-l.rubusch@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
iio: adc: mt6359: Add support for MediaTek MT6373 PMIC AUXADC
MediaTek MT6373 is a PMIC found on MT8196/MT6991 board designs
and communicates with the SoC over SPMI.
This PMIC integrates an Auxiliary ADC (AUXADC) which has a grand
total of 54 channels, of which usually only 9 are used as this
is usually paired with MT6363 on the same board.
For the Auxiliary ADC part, this reuses the same register layout
as the MT6363 PMIC, but exposes only a subset of the ADC chans.
iio: adc: mt6359: Add support for MediaTek MT6363 PMIC AUXADC
MediaTek MT6363 is a PMIC found on MT8196/MT6991 board designs
and communicates with the SoC over SPMI.
This PMIC integrates an Auxiliary ADC (AUXADC) which has a grand
total of 54 ADC channels: 49 PMIC-internal channels, 2 external
NTC thermistor channels and 2 generic ADC channels (mapped to 7
PMIC ADC external inputs).
To use a generic ADC channel it is necessary to enable one of
the PMIC ADC inputs at a time and only then start the reading,
so in this case it is possible to read only one external input
for each generic ADC channel.
Due to the lack of documentation, this implementation supports
using only one generic ADC channel, hence supports reading only
one external input at a time.
iio: adc: mt6359: Move reference voltage to platform data
In preparation to add support for new PMICs, add a `vref_mv`
member to struct mtk_pmic_auxadc_info and use it in place of
the AUXADC_VOLT_FULL definition.
As a consequence, the definition was also removed.
iio: adc: mt6359: Add ready register index and mask to channel data
In preparation for adding support for the AUXADC block found in
the MT6363 PMIC, add the ready register index and mask to the
mtk_pmic_auxadc_chan structure, populate those in the channel
description for all of the already supported SoCs and make use
of them in the .read_imp() callbacks.
Add a compatible and channel bindings for MediaTek's MT6373 PMIC,
featuring an Auxiliary ADC IP with 15 ADC channels for external
(SoC) temperatures and external voltage inputs.
Acked-by: Rob Herring (Arm) <robh@kernel.org> Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Nuno Sá <nuno.sa@analog.com> Link: https://patch.msgid.link/20250703141146.171431-3-angelogioacchino.delregno@collabora.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Add a compatible and channel bindings for MediaTek's MT6363 PMIC,
featuring an Auxiliary ADC IP with 15 ADC channels used for both
internal temperatures and voltages and for external voltage inputs.
Acked-by: Rob Herring (Arm) <robh@kernel.org> Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Reviewed-by: Nuno Sá <nuno.sa@analog.com> Link: https://patch.msgid.link/20250703141146.171431-2-angelogioacchino.delregno@collabora.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
David Lechner [Tue, 1 Jul 2025 21:37:59 +0000 (16:37 -0500)]
iio: adc: ad_sigma_delta: add SPI offload support
Add SPI offload support to the ad_sigma_delta module.
When the SPI controller has SPI offload capabilities, the module will
now use that for buffered reads instead of the RDY interrupt trigger.
Drivers that use the ad_sigma_delta module will have to opt into this
by setting supports_spi_offload since each driver will likely need
additional changes before SPI offload can be used. This will allow us
to gradually enable SPI offload support for each driver.
David Lechner [Tue, 1 Jul 2025 21:37:56 +0000 (16:37 -0500)]
iio: adc: ad_sigma_delta: use spi_optimize_message()
Use spi_optimize_message() to improve the performance of buffered reads.
By setting up the SPI message and pre-optimizing it in the buffer
postenable callback, we can reduce overhead during each sample read.
A rough estimate shows that this reduced the CPU usage of the interrupt
handler thread from 22% to 16% using an EVAL-AD4112ARDZ board on a
DE10-Nano (measuring a single channel at the default 6.2 kHz sample
rate).
David Lechner [Tue, 1 Jul 2025 21:37:54 +0000 (16:37 -0500)]
iio: adc: ad_sigma_delta: audit included headers
Drop linux/iio/sysfs.h since it is unused and replace linux/kernel.h
with more explicit headers. There are a couple of other headers added
weren't covered by kernel.h, like linux/gpio/consumer.h that are added
since the module makes use of those APIs as well.
David Lechner [Tue, 1 Jul 2025 21:37:53 +0000 (16:37 -0500)]
iio: adc: ad_sigma_delta: use BITS_TO_BYTES() macro
Use the BITS_TO_BYTES() macro instead of dividing by 8 to convert bits
to bytes.
This makes it more obvious what unit conversion is taking place.
In one instance, we also avoid the temporary assignment to a variable
as it was confusing that reg_size was being used with two different
units (bits and bytes).
scan_type is factored out to reduce line wrapping.
David Lechner [Tue, 1 Jul 2025 21:37:51 +0000 (16:37 -0500)]
iio: adc: ad_sigma_delta: use u8 instead of uint8_t
Replace uint8_t with u8 in the ad_sigma_delta driver.
Technically, uint8_t comes from the C standard library, while u8 is a
Linux kernel type. Since we don't use the C standard library in the
kernel, we should use the kernel types instead.
There is also one instance where int64_t is replaced with s64.
iio: imu: inv_mpu6050: Replace scnprintf with sysfs_emit
Documentation/filesystems/sysfs.rst mentions that show() should only
use sysfs_emit() or sysfs_emit_at() when formating the value to be
returned to user space. So replace scnprintf() with sysfs_emit().
Signed-off-by: Chelsy Ratnawat <chelsyratnawat2001@gmail.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com> Link: https://patch.msgid.link/20250701154720.54276-1-chelsyratnawat2001@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
David Lechner [Sat, 28 Jun 2025 18:15:10 +0000 (13:15 -0500)]
iio: pressure: dlhl60d: Use separate structures rather than an array for chip info
Change the dlhl60d driver to use individual chip info structures instead
of an array. This reduces the verbosity of the code. Also, the data is
now const as it should have been in the first place.
David Lechner [Sat, 28 Jun 2025 17:52:30 +0000 (12:52 -0500)]
iio: light: cm3232: move calibscale to struct cm3232_chip
Move the calibscale field from struct cm3232_als_info to struct
cm3232_chip. The chip info struct is supposed to be const while the
driver data struct should contain mutable fields. Since calibscale
is a mutable field, it should be in the driver data struct.
David Lechner [Sat, 28 Jun 2025 17:27:46 +0000 (12:27 -0500)]
iio: imu: adis16400: Use separate structures rather than an array for chip info
Change the adis16400 driver to use individual chip info structures
instead of an array. This reduces the verbosity of the code. Also, the
data is now const as it should have been in the first place.
Ad7768-1 has a different -3db frequency multiplier depending on
the filter type configured. The cutoff frequency also varies according
to the current ODR.
Add a readonly low pass -3dB frequency cutoff attribute to clarify to
the user which bandwidth is being allowed depending on the filter
configurations.
David Lechner [Sat, 28 Jun 2025 16:16:51 +0000 (11:16 -0500)]
iio: adc: ad7124: Use separate structures rather than array for chip info
Change the ad7124 driver to use individual chip info structures instead
of an array. This reduces the verbosity of the code. Also, the data is
now const as it should have been in the first place.
Allow clocks property to fix below CHECK_DTB warning:
arch/arm/boot/dts/nxp/lpc/lpc3250-ea3250.dtb: adc@40048000 (nxp,lpc3220-adc): 'clocks' does not match any of the regexes: 'pinctrl-[0-9]+'
David Lechner [Fri, 20 Jun 2025 14:30:46 +0000 (09:30 -0500)]
iio: adc: ad7173: simplify clock enable/disable
Use devm_clk_get_enabled() instead of devm_clk_get(),
clk_prepare_enable(), devm_add_action_or_reset() to simplify the
code as it effectively does the same thing.
We can also drop ext_clk from struct ad7173_state since it is not used
anywhere else.
Andy Shevchenko [Mon, 16 Jun 2025 09:03:21 +0000 (12:03 +0300)]
iio: imu: inv_icm42600: Convert to uXX and sXX integer types
The driver code is full of intXX_t and uintXX_t types which is
not the pattern we use in the IIO subsystem. Switch the driver
to use kernel internal types for that. No functional changes.
David Lechner [Wed, 11 Jun 2025 22:39:13 +0000 (17:39 -0500)]
iio: light: veml6030: use = { } instead of memset()
Use { } instead of memset() to zero-initialize stack memory to simplify
the code.
Signed-off-by: David Lechner <dlechner@baylibre.com> Tested-by: Javier Carrasco <javier.carrasco.cruz@gmail.com> Reviewed-by: Javier Carrasco <javier.carrasco.cruz@gmail.com> Reviewed-by: Nuno Sá <nuno.sa@analog.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/20250611-iio-zero-init-stack-with-instead-of-memset-v1-21-ebb2d0a24302@baylibre.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Lothar Rubusch [Tue, 10 Jun 2025 21:59:25 +0000 (21:59 +0000)]
iio: accel: adxl345: simplify measure enable
Simplify the function to enable or disable measurement. Replace the
separate decision logic and call to regmap_update_bits() by a single
call to regmap_assign_bits() taking a boolean argument directly.
This is a refactoring change and should not impact functionality.
projects / thirdparty / linux.git / log
