mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
7ebd8b66dd
Now that all files were converted to ReST format, rename them and add an index. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
63 lines
1.8 KiB
ReStructuredText
63 lines
1.8 KiB
ReStructuredText
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>
|
|
- Tom Levens <tom.levens@cern.ch>
|
|
|
|
|
|
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 with an external
|
|
diode.
|
|
|
|
|
|
Usage Notes
|
|
-----------
|
|
|
|
This driver does not probe for PMBus devices. You will have to instantiate
|
|
devices explicitly.
|
|
|
|
|
|
Sysfs attributes
|
|
----------------
|
|
|
|
============= ==================================================
|
|
in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V)
|
|
temp1_input Internal chip temperature in millidegrees Celsius
|
|
============= ==================================================
|
|
|
|
A subset of the following attributes are visible, depending on the measurement
|
|
mode of the chip.
|
|
|
|
============= ==========================================================
|
|
in[1-4]_input Voltage at V[1-4] pin in millivolt
|
|
temp2_input External temperature sensor TR1 in millidegrees Celsius
|
|
temp3_input External temperature sensor TR2 in millidegrees Celsius
|
|
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
|
|
============= ==========================================================
|
|
|
|
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.
|