| Kernel driver ltc2945 | |
| ===================== | |
| Supported chips: | |
| * Linear Technology LTC2945 | |
| Prefix: 'ltc2945' | |
| Addresses scanned: - | |
| Datasheet: | |
| http://cds.linear.com/docs/en/datasheet/2945fa.pdf | |
| Author: Guenter Roeck <linux@roeck-us.net> | |
| Description | |
| ----------- | |
| The LTC2945 is a rail-to-rail system monitor that measures current, voltage, | |
| and power consumption. | |
| Usage Notes | |
| ----------- | |
| This driver does not probe for LTC2945 devices, since there is no register | |
| which can be safely used to identify the chip. You will have to instantiate | |
| the devices explicitly. | |
| Example: the following will load the driver for an LTC2945 at address 0x10 | |
| on I2C bus #1: | |
| $ modprobe ltc2945 | |
| $ echo ltc2945 0x10 > /sys/bus/i2c/devices/i2c-1/new_device | |
| Sysfs entries | |
| ------------- | |
| Voltage readings provided by this driver are reported as obtained from the ADC | |
| registers. If a set of voltage divider resistors is installed, calculate the | |
| real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the | |
| value of the divider resistor against the measured voltage and R2 is the value | |
| of the divider resistor against Ground. | |
| Current reading provided by this driver is reported as obtained from the ADC | |
| Current Sense register. The reported value assumes that a 1 mOhm sense resistor | |
| is installed. If a different sense resistor is installed, calculate the real | |
| current by dividing the reported value by the sense resistor value in mOhm. | |
| in1_input VIN voltage (mV). Voltage is measured either at | |
| SENSE+ or VDD pin depending on chip configuration. | |
| in1_min Undervoltage threshold | |
| in1_max Overvoltage threshold | |
| in1_lowest Lowest measured voltage | |
| in1_highest Highest measured voltage | |
| in1_reset_history Write 1 to reset in1 history | |
| in1_min_alarm Undervoltage alarm | |
| in1_max_alarm Overvoltage alarm | |
| in2_input ADIN voltage (mV) | |
| in2_min Undervoltage threshold | |
| in2_max Overvoltage threshold | |
| in2_lowest Lowest measured voltage | |
| in2_highest Highest measured voltage | |
| in2_reset_history Write 1 to reset in2 history | |
| in2_min_alarm Undervoltage alarm | |
| in2_max_alarm Overvoltage alarm | |
| curr1_input SENSE current (mA) | |
| curr1_min Undercurrent threshold | |
| curr1_max Overcurrent threshold | |
| curr1_lowest Lowest measured current | |
| curr1_highest Highest measured current | |
| curr1_reset_history Write 1 to reset curr1 history | |
| curr1_min_alarm Undercurrent alarm | |
| curr1_max_alarm Overcurrent alarm | |
| power1_input Power (in uW). Power is calculated based on SENSE+/VDD | |
| voltage or ADIN voltage depending on chip configuration. | |
| power1_min Low lower threshold | |
| power1_max High power threshold | |
| power1_input_lowest Historical minimum power use | |
| power1_input_highest Historical maximum power use | |
| power1_reset_history Write 1 to reset power1 history | |
| power1_min_alarm Low power alarm | |
| power1_max_alarm High power alarm |