1Kernel driver ltc2990 2===================== 3 4Supported chips: 5 * Linear Technology LTC2990 6 Prefix: 'ltc2990' 7 Addresses scanned: - 8 Datasheet: http://www.linear.com/product/ltc2990 9 10Author: Mike Looijmans <mike.looijmans@topic.nl> 11 Tom Levens <tom.levens@cern.ch> 12 13 14Description 15----------- 16 17LTC2990 is a Quad I2C Voltage, Current and Temperature Monitor. 18The chip's inputs can measure 4 voltages, or two inputs together (1+2 and 3+4) 19can be combined to measure a differential voltage, which is typically used to 20measure current through a series resistor, or a temperature with an external 21diode. 22 23 24Usage Notes 25----------- 26 27This driver does not probe for PMBus devices. You will have to instantiate 28devices explicitly. 29 30 31Sysfs attributes 32---------------- 33 34in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V) 35temp1_input Internal chip temperature in millidegrees Celcius 36 37A subset of the following attributes are visible, depending on the measurement 38mode of the chip. 39 40in[1-4]_input Voltage at V[1-4] pin in millivolt 41temp2_input External temperature sensor TR1 in millidegrees Celcius 42temp3_input External temperature sensor TR2 in millidegrees Celcius 43curr1_input Current in mA across V1-V2 assuming a 1mOhm sense resistor 44curr2_input Current in mA across V3-V4 assuming a 1mOhm sense resistor 45 46The "curr*_input" measurements actually report the voltage drop across the 47input pins in microvolts. This is equivalent to the current through a 1mOhm 48sense resistor. Divide the reported value by the actual sense resistor value 49in mOhm to get the actual value. 50