1Kernel driver ltc2945 2===================== 3 4Supported chips: 5 6 * Linear Technology LTC2945 7 8 Prefix: 'ltc2945' 9 10 Addresses scanned: - 11 12 Datasheet: 13 14 https://www.analog.com/media/en/technical-documentation/data-sheets/2945fb.pdf 15 16Author: Guenter Roeck <linux@roeck-us.net> 17 18 19Description 20----------- 21 22The LTC2945 is a rail-to-rail system monitor that measures current, voltage, 23and power consumption. 24 25 26Usage Notes 27----------- 28 29This driver does not probe for LTC2945 devices, since there is no register 30which can be safely used to identify the chip. You will have to instantiate 31the devices explicitly. 32 33Example: the following will load the driver for an LTC2945 at address 0x10 34on I2C bus #1:: 35 36 $ modprobe ltc2945 37 $ echo ltc2945 0x10 > /sys/bus/i2c/devices/i2c-1/new_device 38 39 40Sysfs entries 41------------- 42 43Voltage readings provided by this driver are reported as obtained from the ADC 44registers. If a set of voltage divider resistors is installed, calculate the 45real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the 46value of the divider resistor against the measured voltage and R2 is the value 47of the divider resistor against Ground. 48 49Current reading provided by this driver is reported as obtained from the ADC 50Current Sense register. The reported value assumes that a 1 mOhm sense resistor 51is installed. If a different sense resistor is installed, calculate the real 52current by dividing the reported value by the sense resistor value in mOhm. 53 54======================= ======================================================== 55in1_input VIN voltage (mV). Voltage is measured either at 56 SENSE+ or VDD pin depending on chip configuration. 57in1_min Undervoltage threshold 58in1_max Overvoltage threshold 59in1_lowest Lowest measured voltage 60in1_highest Highest measured voltage 61in1_reset_history Write 1 to reset in1 history 62in1_min_alarm Undervoltage alarm 63in1_max_alarm Overvoltage alarm 64 65in2_input ADIN voltage (mV) 66in2_min Undervoltage threshold 67in2_max Overvoltage threshold 68in2_lowest Lowest measured voltage 69in2_highest Highest measured voltage 70in2_reset_history Write 1 to reset in2 history 71in2_min_alarm Undervoltage alarm 72in2_max_alarm Overvoltage alarm 73 74curr1_input SENSE current (mA) 75curr1_min Undercurrent threshold 76curr1_max Overcurrent threshold 77curr1_lowest Lowest measured current 78curr1_highest Highest measured current 79curr1_reset_history Write 1 to reset curr1 history 80curr1_min_alarm Undercurrent alarm 81curr1_max_alarm Overcurrent alarm 82 83power1_input Power (in uW). Power is calculated based on SENSE+/VDD 84 voltage or ADIN voltage depending on chip configuration. 85power1_min Low lower threshold 86power1_max High power threshold 87power1_input_lowest Historical minimum power use 88power1_input_highest Historical maximum power use 89power1_reset_history Write 1 to reset power1 history 90power1_min_alarm Low power alarm 91power1_max_alarm High power alarm 92======================= ======================================================== 93