| 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 |
