mirror of https://gitee.com/openkylin/linux.git
44 lines
1.3 KiB
Plaintext
44 lines
1.3 KiB
Plaintext
Kernel driver ltc2990
|
|
=====================
|
|
|
|
Supported chips:
|
|
* Linear Technology LTC2990
|
|
Prefix: 'ltc2990'
|
|
Addresses scanned: -
|
|
Datasheet: http://www.linear.com/product/ltc2990
|
|
|
|
Author: Mike Looijmans <mike.looijmans@topic.nl>
|
|
|
|
|
|
Description
|
|
-----------
|
|
|
|
LTC2990 is a Quad I2C Voltage, Current and Temperature Monitor.
|
|
The chip's inputs can measure 4 voltages, or two inputs together (1+2 and 3+4)
|
|
can be combined to measure a differential voltage, which is typically used to
|
|
measure current through a series resistor, or a temperature.
|
|
|
|
This driver currently uses the 2x differential mode only. In order to support
|
|
other modes, the driver will need to be expanded.
|
|
|
|
|
|
Usage Notes
|
|
-----------
|
|
|
|
This driver does not probe for PMBus devices. You will have to instantiate
|
|
devices explicitly.
|
|
|
|
|
|
Sysfs attributes
|
|
----------------
|
|
|
|
The "curr*_input" measurements actually report the voltage drop across the
|
|
input pins in microvolts. This is equivalent to the current through a 1mOhm
|
|
sense resistor. Divide the reported value by the actual sense resistor value
|
|
in mOhm to get the actual value.
|
|
|
|
in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V)
|
|
temp1_input Internal chip temperature in millidegrees Celcius
|
|
curr1_input Current in mA across v1-v2 assuming a 1mOhm sense resistor.
|
|
curr2_input Current in mA across v3-v4 assuming a 1mOhm sense resistor.
|