Based on kernel version 3.16. Page generated on 2014-08-06 21:39 EST.
1 Kernel driver ina209 2 ===================== 3 4 Supported chips: 5 * Burr-Brown / Texas Instruments INA209 6 Prefix: 'ina209' 7 Addresses scanned: - 8 Datasheet: 9 http://www.ti.com/lit/gpn/ina209 10 11 Author: Paul Hays <Paul.Hays@cattail.ca> 12 Author: Ira W. Snyder <email@example.com> 13 Author: Guenter Roeck <firstname.lastname@example.org> 14 15 16 Description 17 ----------- 18 19 The TI / Burr-Brown INA209 monitors voltage, current, and power on the high side 20 of a D.C. power supply. It can perform measurements and calculations in the 21 background to supply readings at any time. It includes a programmable 22 calibration multiplier to scale the displayed current and power values. 23 24 25 Sysfs entries 26 ------------- 27 28 The INA209 chip is highly configurable both via hardwiring and via 29 the I2C bus. See the datasheet for details. 30 31 This tries to expose most monitoring features of the hardware via 32 sysfs. It does not support every feature of this chip. 33 34 35 in0_input shunt voltage (mV) 36 in0_input_highest shunt voltage historical maximum reading (mV) 37 in0_input_lowest shunt voltage historical minimum reading (mV) 38 in0_reset_history reset shunt voltage history 39 in0_max shunt voltage max alarm limit (mV) 40 in0_min shunt voltage min alarm limit (mV) 41 in0_crit_max shunt voltage crit max alarm limit (mV) 42 in0_crit_min shunt voltage crit min alarm limit (mV) 43 in0_max_alarm shunt voltage max alarm limit exceeded 44 in0_min_alarm shunt voltage min alarm limit exceeded 45 in0_crit_max_alarm shunt voltage crit max alarm limit exceeded 46 in0_crit_min_alarm shunt voltage crit min alarm limit exceeded 47 48 in1_input bus voltage (mV) 49 in1_input_highest bus voltage historical maximum reading (mV) 50 in1_input_lowest bus voltage historical minimum reading (mV) 51 in1_reset_history reset bus voltage history 52 in1_max bus voltage max alarm limit (mV) 53 in1_min bus voltage min alarm limit (mV) 54 in1_crit_max bus voltage crit max alarm limit (mV) 55 in1_crit_min bus voltage crit min alarm limit (mV) 56 in1_max_alarm bus voltage max alarm limit exceeded 57 in1_min_alarm bus voltage min alarm limit exceeded 58 in1_crit_max_alarm bus voltage crit max alarm limit exceeded 59 in1_crit_min_alarm bus voltage crit min alarm limit exceeded 60 61 power1_input power measurement (uW) 62 power1_input_highest power historical maximum reading (uW) 63 power1_reset_history reset power history 64 power1_max power max alarm limit (uW) 65 power1_crit power crit alarm limit (uW) 66 power1_max_alarm power max alarm limit exceeded 67 power1_crit_alarm power crit alarm limit exceeded 68 69 curr1_input current measurement (mA) 70 71 update_interval data conversion time; affects number of samples used 72 to average results for shunt and bus voltages. 73 74 General Remarks 75 --------------- 76 77 The power and current registers in this chip require that the calibration 78 register is programmed correctly before they are used. Normally this is expected 79 to be done in the BIOS. In the absence of BIOS programming, the shunt resistor 80 voltage can be provided using platform data. The driver uses platform data from 81 the ina2xx driver for this purpose. If calibration register data is not provided 82 via platform data, the driver checks if the calibration register has been 83 programmed (ie has a value not equal to zero). If so, this value is retained. 84 Otherwise, a default value reflecting a shunt resistor value of 10 mOhm is 85 programmed into the calibration register. 86 87 88 Output Pins 89 ----------- 90 91 Output pin programming is a board feature which depends on the BIOS. It is 92 outside the scope of a hardware monitoring driver to enable or disable output 93 pins.