Kernel driver ina2xx

Supported chips:

Texas Instruments INA219

Prefix: 'ina219' Addresses: I2C 0x40 - 0x4f

Datasheet: Publicly available at the Texas Instruments website
```
   https://www.ti.com/
```
Texas Instruments INA220

Prefix: 'ina220'

Addresses: I2C 0x40 - 0x4f

Datasheet: Publicly available at the Texas Instruments website
```
   https://www.ti.com/
```
Texas Instruments INA226

Prefix: 'ina226'

Addresses: I2C 0x40 - 0x4f

Datasheet: Publicly available at the Texas Instruments website
```
   https://www.ti.com/
```
Texas Instruments INA230

Prefix: 'ina230'

Addresses: I2C 0x40 - 0x4f

Datasheet: Publicly available at the Texas Instruments website
```
   https://www.ti.com/
```
Texas Instruments INA231

Prefix: 'ina231'

Addresses: I2C 0x40 - 0x4f

Datasheet: Publicly available at the Texas Instruments website
```
   https://www.ti.com/
```
Texas Instruments INA260

Prefix: 'ina260'

Addresses: I2C 0x40 - 0x4f

Datasheet: Publicly available at the Texas Instruments website
```
   https://www.ti.com/
```
Silergy SY24655

Prefix: 'sy24655'

Addresses: I2C 0x40 - 0x4f

Datasheet: Publicly available at the Silergy website
```
   https://us1.silergy.com/
```

Description

The INA219 is a high-side current shunt and power monitor with an I2C interface. The INA219 monitors both shunt drop and supply voltage, with programmable conversion times and filtering.

The INA220 is a high or low side current shunt and power monitor with an I2C interface. The INA220 monitors both shunt drop and supply voltage.

The INA226 is a current shunt and power monitor with an I2C interface. The INA226 monitors both a shunt voltage drop and bus supply voltage.

INA230 and INA231 are high or low side current shunt and power monitors with an I2C interface. The chips monitor both a shunt voltage drop and bus supply voltage.

INA260 is a high or low side current and power monitor with integrated shunt resistor.

The SY24655 is a high- and low-side current shunt and power monitor with an I2C interface. The SY24655 supports both shunt drop and supply voltage, with programmable calibration value and conversion times. The SY24655 can also calculate average power for use in energy conversion.

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.

Additionally ina226 supports update_interval attribute as described in Documentation/hwmon/sysfs-interface.rst. Internally the interval is the sum of bus and shunt voltage conversion times multiplied by the averaging rate. We don't touch the conversion times and only modify the number of averages. The lower limit of the update_interval is 2 ms, the upper limit is 2253 ms. The actual programmed interval may vary from the desired value.

General sysfs entries

======================= =============================================== in0_input Shunt voltage(mV) channel in1_input Bus voltage(mV) channel curr1_input Current(mA) measurement channel power1_input Power(uW) measurement channel shunt_resistor Shunt resistance(uOhm) channel (not for ina260) ======================= ===============================================

Additional sysfs entries for ina226, ina230, ina231, ina260, and sy24655

======================= ==================================================== curr1_lcrit Critical low current curr1_crit Critical high current curr1_lcrit_alarm Current critical low alarm curr1_crit_alarm Current critical high alarm in0_lcrit Critical low shunt voltage in0_crit Critical high shunt voltage in0_lcrit_alarm Shunt voltage critical low alarm in0_crit_alarm Shunt voltage critical high alarm in1_lcrit Critical low bus voltage in1_crit Critical high bus voltage in1_lcrit_alarm Bus voltage critical low alarm in1_crit_alarm Bus voltage critical high alarm power1_crit Critical high power power1_crit_alarm Power critical high alarm update_interval data conversion time; affects number of samples used to average results for shunt and bus voltages. ======================= ====================================================

Sysfs entries for sy24655 only

======================= ==================================================== power1_average average power from last reading to the present. ======================= ====================================================

.. note::

Configure shunt_resistor before configure power1_crit, because power value is calculated based on shunt_resistor set.
Because of the underlying register implementation, only one *crit setting and its alarm can be active. Writing to one *crit setting clears other *crit settings and alarms. Writing 0 to any *crit setting clears all *crit settings and alarms.