1Kernel driver ltc2990
2=====================
3
4
5Supported chips:
6
7  * Linear Technology LTC2990
8
9    Prefix: 'ltc2990'
10
11    Addresses scanned: -
12
13    Datasheet: http://www.linear.com/product/ltc2990
14
15
16
17Author:
18
19	- Mike Looijmans <mike.looijmans@topic.nl>
20	- Tom Levens <tom.levens@cern.ch>
21
22
23Description
24-----------
25
26LTC2990 is a Quad I2C Voltage, Current and Temperature Monitor.
27The chip's inputs can measure 4 voltages, or two inputs together (1+2 and 3+4)
28can be combined to measure a differential voltage, which is typically used to
29measure current through a series resistor, or a temperature with an external
30diode.
31
32
33Usage Notes
34-----------
35
36This driver does not probe for PMBus devices. You will have to instantiate
37devices explicitly.
38
39
40Sysfs attributes
41----------------
42
43============= ==================================================
44in0_input     Voltage at Vcc pin in millivolt (range 2.5V to 5V)
45temp1_input   Internal chip temperature in millidegrees Celsius
46============= ==================================================
47
48A subset of the following attributes are visible, depending on the measurement
49mode of the chip.
50
51============= ==========================================================
52in[1-4]_input Voltage at V[1-4] pin in millivolt
53temp2_input   External temperature sensor TR1 in millidegrees Celsius
54temp3_input   External temperature sensor TR2 in millidegrees Celsius
55curr1_input   Current in mA across V1-V2 assuming a 1mOhm sense resistor
56curr2_input   Current in mA across V3-V4 assuming a 1mOhm sense resistor
57============= ==========================================================
58
59The "curr*_input" measurements actually report the voltage drop across the
60input pins in microvolts. This is equivalent to the current through a 1mOhm
61sense resistor. Divide the reported value by the actual sense resistor value
62in mOhm to get the actual value.
63