Driver for INA209
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Note ==== This driver is compile tested only at this time. Use at your own risk. Test feedback welcome. 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 <email@example.com> Author: Ira W. Snyder <firstname.lastname@example.org> Author: Guenter Roeck <email@example.com> 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_alarm power max alarm limit exceeded power1_crit_alarm power crit alarm limit exceeded curr1_input current measurement (mA) 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.