3ad867001c
fix the sysfs shunt resistor read access: return the shunt resistor value, not the calibration register contents. update email address Signed-off-by: Lothar Felten <lothar.felten@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
64 lines
2.3 KiB
Text
64 lines
2.3 KiB
Text
Kernel driver ina2xx
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====================
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Supported chips:
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* Texas Instruments INA219
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Prefix: 'ina219'
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Addresses: I2C 0x40 - 0x4f
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Datasheet: Publicly available at the Texas Instruments website
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http://www.ti.com/
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* Texas Instruments INA220
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Prefix: 'ina220'
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Addresses: I2C 0x40 - 0x4f
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Datasheet: Publicly available at the Texas Instruments website
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http://www.ti.com/
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* Texas Instruments INA226
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Prefix: 'ina226'
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Addresses: I2C 0x40 - 0x4f
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Datasheet: Publicly available at the Texas Instruments website
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http://www.ti.com/
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* Texas Instruments INA230
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Prefix: 'ina230'
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Addresses: I2C 0x40 - 0x4f
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Datasheet: Publicly available at the Texas Instruments website
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http://www.ti.com/
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* Texas Instruments INA231
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Prefix: 'ina231'
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Addresses: I2C 0x40 - 0x4f
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Datasheet: Publicly available at the Texas Instruments website
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http://www.ti.com/
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Author: Lothar Felten <lothar.felten@gmail.com>
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Description
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-----------
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The INA219 is a high-side current shunt and power monitor with an I2C
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interface. The INA219 monitors both shunt drop and supply voltage, with
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programmable conversion times and filtering.
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The INA220 is a high or low side current shunt and power monitor with an I2C
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interface. The INA220 monitors both shunt drop and supply voltage.
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The INA226 is a current shunt and power monitor with an I2C interface.
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The INA226 monitors both a shunt voltage drop and bus supply voltage.
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INA230 and INA231 are high or low side current shunt and power monitors
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with an I2C interface. The chips monitor both a shunt voltage drop and
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bus supply voltage.
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The shunt value in micro-ohms can be set via platform data or device tree at
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compile-time or via the shunt_resistor attribute in sysfs at run-time. Please
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refer to the Documentation/devicetree/bindings/hwmon/ina2xx.txt for bindings
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if the device tree is used.
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Additionally ina226 supports update_interval attribute as described in
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Documentation/hwmon/sysfs-interface. Internally the interval is the sum of
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bus and shunt voltage conversion times multiplied by the averaging rate. We
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don't touch the conversion times and only modify the number of averages. The
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lower limit of the update_interval is 2 ms, the upper limit is 2253 ms.
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The actual programmed interval may vary from the desired value.
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