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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2015-01-09 17:03:42 +0100
committerGuenter Roeck <linux@roeck-us.net>2015-01-25 21:23:59 -0800
commit72a87a47a81e062fc27b7675db33cf29458bc6d2 (patch)
tree36b42c9ca7a0f0874992c483b4687a7c57aeab4d /Documentation/hwmon
parent8a5fc79513afe325fd755026299d0bfdb47e42de (diff)
downloadkernel-72a87a47a81e062fc27b7675db33cf29458bc6d2.tar.gz
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 <bgolaszewski@baylibre.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon')
-rw-r--r--Documentation/hwmon/ina2xx7
1 files changed, 7 insertions, 0 deletions
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.