Hello! Second round for Maxim max9611/max9612 high-side current sense amplifier driver.
For reference, a simplified integration schematic drawing is here reported: ----o----/\/\/-----o-------|LOAD|--- | shunt | ____|______________|___ | RS+ RS- | | |-----gain-----| | | | | | | | |max9611 |->| ADC |===== I2c |______________________| public datasheet available at https://datasheets.maximintegrated.com/en/ds/MAX9611-MAX9612.pdf Compared to v1, all channels whose values are calculated using parameters depending on the applied gain have been transformed in "processed" channels. Gain selection procedure is performed in kernel space, and gain-dependent values (current sense amplifier gain and offset) are not exposed to userspace anymore. output reported from iio_info tool: iio:device0: max9611_vdd 6 channels found: voltage0: (input) 1 channel-specific attributes found: attr 0: input value: 4.085000000 voltage1: (input) 3 channel-specific attributes found: attr 0: scale value: 14 attr 1: offset value: 1 attr 2: raw value: 59 shunt: (input) 2 channel-specific attributes found: attr 0: resistor_power value: 5000 attr 1: resistor_current value: 5000 power: (input) 1 channel-specific attributes found: attr 0: input value: 663.404000000 temp: (input) 2 channel-specific attributes found: attr 0: scale value: 0.480076812 attr 1: raw value: 59 current: (input) 1 channel-specific attributes found: attr 0: input value: 817.000000000 Tested on Salvator-X M3-W board. Thanks j v1 -> v2: - Drop wildcard (max961x) in driver, documentation and dt-bindings. Use max9611 instead. - Make 3 processed channels for csa voltage, csa current and power load - Remove wrapper functions around i2c buffer access - Add locking in read_raw() - Make 2 separate attributes for shunt resistor: current and power - Renamed shunt resistor attribute - Fixed several review comments Jacopo Mondi (4): Documentation: dt-bindings: iio: Add max9611 ADC iio: Documentation: Add max9611 sysfs documentation iio: adc: Add Maxim max9611 ADC driver arm64: dts: salvator-x: Add current sense amplifiers .../ABI/testing/sysfs-bus-iio-adc-max9611 | 16 + .../devicetree/bindings/iio/adc/max9611.txt | 27 + arch/arm64/boot/dts/renesas/r8a7796-salvator-x.dts | 18 + drivers/iio/adc/Kconfig | 10 + drivers/iio/adc/Makefile | 1 + drivers/iio/adc/max9611.c | 590 +++++++++++++++++++++ 6 files changed, 662 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-max9611 create mode 100644 Documentation/devicetree/bindings/iio/adc/max9611.txt create mode 100644 drivers/iio/adc/max9611.c -- 2.7.4