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Documentation/hwmon/ltc2945 2.75 KB
6700ce035   Guenter Roeck   hwmon: Driver for...
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  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