Kernel driver ina238

Supported chips:

Author: Nathan Rossi <>


The INA238 is a current shunt, power and temperature monitor with an I2C interface. It includes a number of programmable functions including alerts, conversion rate, sample averaging and selectable shunt voltage accuracy.

The shunt value in micro-ohms can be set via platform data or device tree at compile-time or via the shunt_resistor attribute in sysfs at run-time. Please refer to the Documentation/devicetree/bindings/hwmon/ti,ina2xx.yaml for bindings if the device tree is used.

Sysfs entries

in0_input Shunt voltage (mV)
in0_min Minimum shunt voltage threshold (mV)
in0_min_alarm Minimum shunt voltage alarm
in0_max Maximum shunt voltage threshold (mV)
in0_max_alarm Maximum shunt voltage alarm
in1_input Bus voltage (mV)
in1_min Minimum bus voltage threshold (mV)
in1_min_alarm Minimum shunt voltage alarm
in1_max Maximum bus voltage threshold (mV)
in1_max_alarm Maximum shunt voltage alarm
power1_input Power measurement (uW)
power1_max Maximum power threshold (uW)
power1_max_alarm Maximum power alarm
curr1_input Current measurement (mA)
temp1_input Die temperature measurement (mC)
temp1_max Maximum die temperature threshold (mC)
temp1_max_alarm Maximum die temperature alarm