| 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> |
| - Ira W. Snyder <iws@ovro.caltech.edu> |
| - 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. |
