From 72a87a47a81e062fc27b7675db33cf29458bc6d2 Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Fri, 9 Jan 2015 17:03:42 +0100 Subject: hwmon: (ina2xx) implement update_interval attribute for ina226 This attribute allows to configure the update interval of ina226. Although the bus and shunt voltage conversion times remain hardcoded to 1.1 ms, we can now modify said interval by changing the averaging rate. While we're at it - add an additional variable to ina2xx_data, which holds the current configuration settings - this way we'll be able to restore the configuration in case of an unexpected chip reset. Signed-off-by: Bartosz Golaszewski Signed-off-by: Guenter Roeck --- Documentation/hwmon/ina2xx | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'Documentation') diff --git a/Documentation/hwmon/ina2xx b/Documentation/hwmon/ina2xx index 320dd69fb5e6..450e3ccd983d 100644 --- a/Documentation/hwmon/ina2xx +++ b/Documentation/hwmon/ina2xx @@ -48,3 +48,10 @@ 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. + +Additionally ina226 supports update_interval attribute as described in +Documentation/hwmon/sysfs-interface. Internally the interval is the sum of +bus and shunt voltage conversion times multiplied by the averaging rate. We +don't touch the conversion times and only modify the number of averages. The +lower limit of the update_interval is 2 ms, the upper limit is 2253 ms. +The actual programmed interval may vary from the desired value. -- cgit v1.2.3-59-g8ed1b