1Kernel driver ina3221
2=====================
3
4Supported chips:
5
6  * Texas Instruments INA3221
7
8    Prefix: 'ina3221'
9
10    Addresses: I2C 0x40 - 0x43
11
12    Datasheet: Publicly available at the Texas Instruments website
13
14	       http://www.ti.com/
15
16Author: Andrew F. Davis <afd@ti.com>
17
18Description
19-----------
20
21The Texas Instruments INA3221 monitors voltage, current, and power on the high
22side of up to three D.C. power supplies. The INA3221 monitors both shunt drop
23and supply voltage, with programmable conversion times and averaging, current
24and power are calculated host-side from these.
25
26Sysfs entries
27-------------
28
29======================= =======================================================
30in[123]_label           Voltage channel labels
31in[123]_enable          Voltage channel enable controls
32in[123]_input           Bus voltage(mV) channels
33curr[123]_input         Current(mA) measurement channels
34shunt[123]_resistor     Shunt resistance(uOhm) channels
35curr[123]_crit          Critical alert current(mA) setting, activates the
36			corresponding alarm when the respective current
37			is above this value
38curr[123]_crit_alarm    Critical alert current limit exceeded
39curr[123]_max           Warning alert current(mA) setting, activates the
40			corresponding alarm when the respective current
41			average is above this value.
42curr[123]_max_alarm     Warning alert current limit exceeded
43in[456]_input           Shunt voltage(uV) for channels 1, 2, and 3 respectively
44in7_input               Sum of shunt voltage(uV) channels
45in7_label               Channel label for sum of shunt voltage
46curr4_input             Sum of current(mA) measurement channels,
47                        (only available when all channels use the same resistor
48                        value for their shunt resistors)
49curr4_crit              Critical alert current(mA) setting for sum of current
50                        measurements, activates the corresponding alarm
51                        when the respective current is above this value
52                        (only effective when all channels use the same resistor
53                        value for their shunt resistors)
54curr4_crit_alarm        Critical alert current limit exceeded for sum of
55                        current measurements.
56samples                 Number of samples using in the averaging mode.
57
58                        Supports the list of number of samples:
59
60                          1, 4, 16, 64, 128, 256, 512, 1024
61
62update_interval         Data conversion time in millisecond, following:
63
64                          update_interval = C x S x (BC + SC)
65
66                          * C:	number of enabled channels
67                          * S:	number of samples
68                          * BC:	bus-voltage conversion time in millisecond
69                          * SC:	shunt-voltage conversion time in millisecond
70
71                        Affects both Bus- and Shunt-voltage conversion time.
72                        Note that setting update_interval to 0ms sets both BC
73                        and SC to 140 us (minimum conversion time).
74======================= =======================================================
75