how to use ina220 current monitor

[odasong]

I used the ina220 current monitor by referring to the ls1046frwy document. 

http://www1.futureelectronics.com/doc/NXP/FRWY-LS1046A-TP.pdf 

The ina220 current monitor result value is different from what I expected, so I want to modify the ina2xx.c code. According to the QorIQ LS1046A BSP v0.4 document, the source code location is drivers/hwmon/ina2xx.c, but hwmon is not visible in /sys/bus/i2c/drivers. I found hwmon in /sys/class, but when I entered hwmon0 inside, I couldn't find ina2xx.c. I would like to know where I can find ina2xx.c. 

https://www.nxp.com/docs/en/supporting-information/QORIQ_LS1046A_BSP_V0-4_REV-A.pdf 

Additionally, there is a problem that a total of 3 ina220s are used, but only 1 is captured. Is it correct to put the i2c address in channel@2 of the default node in ina2xx.c as shown in the picture below? Also, it would be nice if you could tell me where to modify the calibration register.

[yipingwang]

Please enable the following options in Linux Kernel configuration file and rebuild Linux Kernel. It seems that these options are not enabled by default.

CONFIG_I2C_MPC=y

SENSORS_INA2XX=y

In the dts configuration, reg is I2C address of the device.

ina220@44 {
compatible = "ti,ina220";
reg = <0x44>;
shunt-resistor = <1000>;
};