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diff --git a/Documentation/hwmon/ina2xx b/Documentation/hwmon/ina2xx new file mode 100644 index 000000000..cfd31d94c --- /dev/null +++ b/Documentation/hwmon/ina2xx @@ -0,0 +1,64 @@ +Kernel driver ina2xx +==================== + +Supported chips: + * Texas Instruments INA219 + Prefix: 'ina219' + Addresses: I2C 0x40 - 0x4f + Datasheet: Publicly available at the Texas Instruments website + http://www.ti.com/ + + * Texas Instruments INA220 + Prefix: 'ina220' + Addresses: I2C 0x40 - 0x4f + Datasheet: Publicly available at the Texas Instruments website + http://www.ti.com/ + + * Texas Instruments INA226 + Prefix: 'ina226' + Addresses: I2C 0x40 - 0x4f + Datasheet: Publicly available at the Texas Instruments website + http://www.ti.com/ + + * Texas Instruments INA230 + Prefix: 'ina230' + Addresses: I2C 0x40 - 0x4f + Datasheet: Publicly available at the Texas Instruments website + http://www.ti.com/ + + * Texas Instruments INA231 + Prefix: 'ina231' + Addresses: I2C 0x40 - 0x4f + Datasheet: Publicly available at the Texas Instruments website + http://www.ti.com/ + +Author: Lothar Felten <l-felten@ti.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. + +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/i2c/ina2xx.txt for bindings +if the device tree is used. + +Additionally ina226 supports update_interval attribute as described in +Documentation/hwmon/sysfs-interface. 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. |