1Kernel driver ina2xx
2====================
3
4Supported chips:
5  * Texas Instruments INA219
6    Prefix: 'ina219'
7    Addresses: I2C 0x40 - 0x4f
8    Datasheet: Publicly available at the Texas Instruments website
9               http://www.ti.com/
10
11  * Texas Instruments INA220
12    Prefix: 'ina220'
13    Addresses: I2C 0x40 - 0x4f
14    Datasheet: Publicly available at the Texas Instruments website
15               http://www.ti.com/
16
17  * Texas Instruments INA226
18    Prefix: 'ina226'
19    Addresses: I2C 0x40 - 0x4f
20    Datasheet: Publicly available at the Texas Instruments website
21               http://www.ti.com/
22
23  * Texas Instruments INA230
24    Prefix: 'ina230'
25    Addresses: I2C 0x40 - 0x4f
26    Datasheet: Publicly available at the Texas Instruments website
27               http://www.ti.com/
28
29  * Texas Instruments INA231
30    Prefix: 'ina231'
31    Addresses: I2C 0x40 - 0x4f
32    Datasheet: Publicly available at the Texas Instruments website
33               http://www.ti.com/
34
35Author: Lothar Felten <l-felten@ti.com>
36
37Description
38-----------
39
40The INA219 is a high-side current shunt and power monitor with an I2C
41interface. The INA219 monitors both shunt drop and supply voltage, with
42programmable conversion times and filtering.
43
44The INA220 is a high or low side current shunt and power monitor with an I2C
45interface. The INA220 monitors both shunt drop and supply voltage.
46
47The INA226 is a current shunt and power monitor with an I2C interface.
48The INA226 monitors both a shunt voltage drop and bus supply voltage.
49
50INA230 and INA231 are high or low side current shunt and power monitors
51with an I2C interface. The chips monitor both a shunt voltage drop and
52bus supply voltage.
53
54The shunt value in micro-ohms can be set via platform data or device tree at
55compile-time or via the shunt_resistor attribute in sysfs at run-time. Please
56refer to the Documentation/devicetree/bindings/i2c/ina2xx.txt for bindings
57if the device tree is used.
58
59Additionally ina226 supports update_interval attribute as described in
60Documentation/hwmon/sysfs-interface. Internally the interval is the sum of
61bus and shunt voltage conversion times multiplied by the averaging rate. We
62don't touch the conversion times and only modify the number of averages. The
63lower limit of the update_interval is 2 ms, the upper limit is 2253 ms.
64The actual programmed interval may vary from the desired value.
65