1Kernel driver ina209 2===================== 3 4Supported chips: 5 * Burr-Brown / Texas Instruments INA209 6 Prefix: 'ina209' 7 Addresses scanned: - 8 Datasheet: 9 http://www.ti.com/lit/gpn/ina209 10 11Author: Paul Hays <Paul.Hays@cattail.ca> 12Author: Ira W. Snyder <iws@ovro.caltech.edu> 13Author: Guenter Roeck <linux@roeck-us.net> 14 15 16Description 17----------- 18 19The TI / Burr-Brown INA209 monitors voltage, current, and power on the high side 20of a D.C. power supply. It can perform measurements and calculations in the 21background to supply readings at any time. It includes a programmable 22calibration multiplier to scale the displayed current and power values. 23 24 25Sysfs entries 26------------- 27 28The INA209 chip is highly configurable both via hardwiring and via 29the I2C bus. See the datasheet for details. 30 31This tries to expose most monitoring features of the hardware via 32sysfs. It does not support every feature of this chip. 33 34 35in0_input shunt voltage (mV) 36in0_input_highest shunt voltage historical maximum reading (mV) 37in0_input_lowest shunt voltage historical minimum reading (mV) 38in0_reset_history reset shunt voltage history 39in0_max shunt voltage max alarm limit (mV) 40in0_min shunt voltage min alarm limit (mV) 41in0_crit_max shunt voltage crit max alarm limit (mV) 42in0_crit_min shunt voltage crit min alarm limit (mV) 43in0_max_alarm shunt voltage max alarm limit exceeded 44in0_min_alarm shunt voltage min alarm limit exceeded 45in0_crit_max_alarm shunt voltage crit max alarm limit exceeded 46in0_crit_min_alarm shunt voltage crit min alarm limit exceeded 47 48in1_input bus voltage (mV) 49in1_input_highest bus voltage historical maximum reading (mV) 50in1_input_lowest bus voltage historical minimum reading (mV) 51in1_reset_history reset bus voltage history 52in1_max bus voltage max alarm limit (mV) 53in1_min bus voltage min alarm limit (mV) 54in1_crit_max bus voltage crit max alarm limit (mV) 55in1_crit_min bus voltage crit min alarm limit (mV) 56in1_max_alarm bus voltage max alarm limit exceeded 57in1_min_alarm bus voltage min alarm limit exceeded 58in1_crit_max_alarm bus voltage crit max alarm limit exceeded 59in1_crit_min_alarm bus voltage crit min alarm limit exceeded 60 61power1_input power measurement (uW) 62power1_input_highest power historical maximum reading (uW) 63power1_reset_history reset power history 64power1_max power max alarm limit (uW) 65power1_crit power crit alarm limit (uW) 66power1_max_alarm power max alarm limit exceeded 67power1_crit_alarm power crit alarm limit exceeded 68 69curr1_input current measurement (mA) 70 71update_interval data conversion time; affects number of samples used 72 to average results for shunt and bus voltages. 73 74General Remarks 75--------------- 76 77The power and current registers in this chip require that the calibration 78register is programmed correctly before they are used. Normally this is expected 79to be done in the BIOS. In the absence of BIOS programming, the shunt resistor 80voltage can be provided using platform data. The driver uses platform data from 81the ina2xx driver for this purpose. If calibration register data is not provided 82via platform data, the driver checks if the calibration register has been 83programmed (ie has a value not equal to zero). If so, this value is retained. 84Otherwise, a default value reflecting a shunt resistor value of 10 mOhm is 85programmed into the calibration register. 86 87 88Output Pins 89----------- 90 91Output pin programming is a board feature which depends on the BIOS. It is 92outside the scope of a hardware monitoring driver to enable or disable output 93pins. 94