1Kernel driver ina209 2==================== 3 4Supported chips: 5 6 * Burr-Brown / Texas Instruments INA209 7 8 Prefix: 'ina209' 9 10 Addresses scanned: - 11 12 Datasheet: 13 https://www.ti.com/lit/gpn/ina209 14 15Author: 16 - Paul Hays <Paul.Hays@cattail.ca> 17 - Ira W. Snyder <iws@ovro.caltech.edu> 18 - Guenter Roeck <linux@roeck-us.net> 19 20 21Description 22----------- 23 24The TI / Burr-Brown INA209 monitors voltage, current, and power on the high side 25of a D.C. power supply. It can perform measurements and calculations in the 26background to supply readings at any time. It includes a programmable 27calibration multiplier to scale the displayed current and power values. 28 29 30Sysfs entries 31------------- 32 33The INA209 chip is highly configurable both via hardwiring and via 34the I2C bus. See the datasheet for details. 35 36This tries to expose most monitoring features of the hardware via 37sysfs. It does not support every feature of this chip. 38 39======================= ======================================================= 40in0_input shunt voltage (mV) 41in0_input_highest shunt voltage historical maximum reading (mV) 42in0_input_lowest shunt voltage historical minimum reading (mV) 43in0_reset_history reset shunt voltage history 44in0_max shunt voltage max alarm limit (mV) 45in0_min shunt voltage min alarm limit (mV) 46in0_crit_max shunt voltage crit max alarm limit (mV) 47in0_crit_min shunt voltage crit min alarm limit (mV) 48in0_max_alarm shunt voltage max alarm limit exceeded 49in0_min_alarm shunt voltage min alarm limit exceeded 50in0_crit_max_alarm shunt voltage crit max alarm limit exceeded 51in0_crit_min_alarm shunt voltage crit min alarm limit exceeded 52 53in1_input bus voltage (mV) 54in1_input_highest bus voltage historical maximum reading (mV) 55in1_input_lowest bus voltage historical minimum reading (mV) 56in1_reset_history reset bus voltage history 57in1_max bus voltage max alarm limit (mV) 58in1_min bus voltage min alarm limit (mV) 59in1_crit_max bus voltage crit max alarm limit (mV) 60in1_crit_min bus voltage crit min alarm limit (mV) 61in1_max_alarm bus voltage max alarm limit exceeded 62in1_min_alarm bus voltage min alarm limit exceeded 63in1_crit_max_alarm bus voltage crit max alarm limit exceeded 64in1_crit_min_alarm bus voltage crit min alarm limit exceeded 65 66power1_input power measurement (uW) 67power1_input_highest power historical maximum reading (uW) 68power1_reset_history reset power history 69power1_max power max alarm limit (uW) 70power1_crit power crit alarm limit (uW) 71power1_max_alarm power max alarm limit exceeded 72power1_crit_alarm power crit alarm limit exceeded 73 74curr1_input current measurement (mA) 75 76update_interval data conversion time; affects number of samples used 77 to average results for shunt and bus voltages. 78======================= ======================================================= 79 80General Remarks 81--------------- 82 83The power and current registers in this chip require that the calibration 84register is programmed correctly before they are used. Normally this is expected 85to be done in the BIOS. In the absence of BIOS programming, the shunt resistor 86voltage can be provided using platform data. The driver uses platform data from 87the ina2xx driver for this purpose. If calibration register data is not provided 88via platform data, the driver checks if the calibration register has been 89programmed (ie has a value not equal to zero). If so, this value is retained. 90Otherwise, a default value reflecting a shunt resistor value of 10 mOhm is 91programmed into the calibration register. 92 93 94Output Pins 95----------- 96 97Output pin programming is a board feature which depends on the BIOS. It is 98outside the scope of a hardware monitoring driver to enable or disable output 99pins. 100