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- Kernel driver ina209
- =====================
- Supported chips:
- * Burr-Brown / Texas Instruments INA209
- Prefix: 'ina209'
- Addresses scanned: -
- Datasheet:
- http://www.ti.com/lit/gpn/ina209
- Author: Paul Hays <Paul.Hays@cattail.ca>
- Author: Ira W. Snyder <iws@ovro.caltech.edu>
- Author: Guenter Roeck <linux@roeck-us.net>
- Description
- -----------
- The TI / Burr-Brown INA209 monitors voltage, current, and power on the high side
- of a D.C. power supply. It can perform measurements and calculations in the
- background to supply readings at any time. It includes a programmable
- calibration multiplier to scale the displayed current and power values.
- Sysfs entries
- -------------
- The INA209 chip is highly configurable both via hardwiring and via
- the I2C bus. See the datasheet for details.
- This tries to expose most monitoring features of the hardware via
- sysfs. It does not support every feature of this chip.
- in0_input shunt voltage (mV)
- in0_input_highest shunt voltage historical maximum reading (mV)
- in0_input_lowest shunt voltage historical minimum reading (mV)
- in0_reset_history reset shunt voltage history
- in0_max shunt voltage max alarm limit (mV)
- in0_min shunt voltage min alarm limit (mV)
- in0_crit_max shunt voltage crit max alarm limit (mV)
- in0_crit_min shunt voltage crit min alarm limit (mV)
- in0_max_alarm shunt voltage max alarm limit exceeded
- in0_min_alarm shunt voltage min alarm limit exceeded
- in0_crit_max_alarm shunt voltage crit max alarm limit exceeded
- in0_crit_min_alarm shunt voltage crit min alarm limit exceeded
- in1_input bus voltage (mV)
- in1_input_highest bus voltage historical maximum reading (mV)
- in1_input_lowest bus voltage historical minimum reading (mV)
- in1_reset_history reset bus voltage history
- in1_max bus voltage max alarm limit (mV)
- in1_min bus voltage min alarm limit (mV)
- in1_crit_max bus voltage crit max alarm limit (mV)
- in1_crit_min bus voltage crit min alarm limit (mV)
- in1_max_alarm bus voltage max alarm limit exceeded
- in1_min_alarm bus voltage min alarm limit exceeded
- in1_crit_max_alarm bus voltage crit max alarm limit exceeded
- in1_crit_min_alarm bus voltage crit min alarm limit exceeded
- power1_input power measurement (uW)
- power1_input_highest power historical maximum reading (uW)
- power1_reset_history reset power history
- power1_max power max alarm limit (uW)
- power1_crit power crit alarm limit (uW)
- power1_max_alarm power max alarm limit exceeded
- power1_crit_alarm power crit alarm limit exceeded
- curr1_input current measurement (mA)
- update_interval data conversion time; affects number of samples used
- to average results for shunt and bus voltages.
- General Remarks
- ---------------
- The power and current registers in this chip require that the calibration
- register is programmed correctly before they are used. Normally this is expected
- to be done in the BIOS. In the absence of BIOS programming, the shunt resistor
- voltage can be provided using platform data. The driver uses platform data from
- the ina2xx driver for this purpose. If calibration register data is not provided
- via platform data, the driver checks if the calibration register has been
- programmed (ie has a value not equal to zero). If so, this value is retained.
- Otherwise, a default value reflecting a shunt resistor value of 10 mOhm is
- programmed into the calibration register.
- Output Pins
- -----------
- Output pin programming is a board feature which depends on the BIOS. It is
- outside the scope of a hardware monitoring driver to enable or disable output
- pins.
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