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iio: adc: add support for pac1921

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Add support for Microchip PAC1921 Power/Current monitor.

Implemented features:
* capture of bus voltage, sense voltage, current and power measurements
  in free-run integration mode
* support for both raw and triggered buffer reading
* support for overflow events
* scale attributes to control voltage and current gains
* oversampling ratio attribute to control the number of integration
  samples
* sampling rate attribute that reflects the integration period
* userspace attribute and DT parameter to control shunt resistor
* simple power management support

Limitations:
* operation mode fixed to free-run integration
* READ/INT pin and OUT pin not supported
* no controls for measurement resolutions and filters

Signed-off-by: Matteo Martelli <matteomartelli3@gmail.com>
Link: https://patch.msgid.link/20240724-iio-pac1921-v4-3-723698e903a3@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Matteo Martelli 2024-07-24 11:08:33 +02:00 committed by Jonathan Cameron
parent e5535ccf44
commit 371f778b83
4 changed files with 1282 additions and 0 deletions
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7
MAINTAINERS
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@ -15054,6 +15054,13 @@ F: Documentation/devicetree/bindings/nvmem/microchip,sama7g5-otpc.yaml
F: drivers/nvmem/microchip-otpc.c
F: include/dt-bindings/nvmem/microchip,sama7g5-otpc.h
MICROCHIP PAC1921 POWER/CURRENT MONITOR DRIVER
M: Matteo Martelli <matteomartelli3@gmail.com>
L: linux-iio@vger.kernel.org
S: Supported
F: Documentation/devicetree/bindings/iio/adc/microchip,pac1921.yaml
F: drivers/iio/adc/pac1921.c
MICROCHIP PAC1934 POWER/ENERGY MONITOR DRIVER
M: Marius Cristea <marius.cristea@microchip.com>
L: linux-iio@vger.kernel.org

13
drivers/iio/adc/Kconfig
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@ -1002,6 +1002,19 @@ config NPCM_ADC
This driver can also be built as a module. If so, the module
will be called npcm_adc.
config PAC1921
tristate "Microchip Technology PAC1921 driver"
depends on I2C
select REGMAP_I2C
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
help
Say yes here to build support for Microchip Technology's PAC1921
High-Side Power/Current Monitor with Analog Output.
This driver can also be built as a module. If so, the module
will be called pac1921.
config PAC1934
tristate "Microchip Technology PAC1934 driver"
depends on I2C

1
drivers/iio/adc/Makefile
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@ -91,6 +91,7 @@ obj-$(CONFIG_MP2629_ADC) += mp2629_adc.o
obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
obj-$(CONFIG_NAU7802) += nau7802.o
obj-$(CONFIG_NPCM_ADC) += npcm_adc.o
obj-$(CONFIG_PAC1921) += pac1921.o
obj-$(CONFIG_PAC1934) += pac1934.o
obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
obj-$(CONFIG_QCOM_PM8XXX_XOADC) += qcom-pm8xxx-xoadc.o

1261
drivers/iio/adc/pac1921.c Normal file
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