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hwmon: (ina2xx) make shunt resistance configurable at run-time

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The shunt resistance can only be set via platform_data or device tree. This
isn't suitable for devices in which the shunt resistance can change/isn't
known at boot-time.

Add a sysfs attribute that allows to read and set the shunt resistance.

Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>
This commit is contained in:
Bartosz Golaszewski 2015-01-05 15:20:55 +01:00 • committed by Guenter Roeck
commit 8a5fc79513
2 changed files with 49 additions and 4 deletions
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5
Documentation/hwmon/ina2xx
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@ -44,6 +44,7 @@ The INA226 monitors both a shunt voltage drop and bus supply voltage.
The INA230 is a high or low side current shunt and power monitor with an I2C
interface. The INA230 monitors both a shunt voltage drop and bus supply voltage.
The shunt value in micro-ohms can be set via platform data or device tree.
Please refer to the Documentation/devicetree/bindings/i2c/ina2xx.txt for bindings
The shunt value in micro-ohms can be set via platform data or device tree at
compile-time or via the shunt_resistor attribute in sysfs at run-time. Please
refer to the Documentation/devicetree/bindings/i2c/ina2xx.txt for bindings
if the device tree is used.