A user complained that the ftsteutates driver was displaying
bogus values since its introduction. This happens because the
sensor measurements need to be scaled in order to produce
meaningful results:
- the fan speed needs to be multiplied by 60 since its in RPS
- the temperature is in degrees celsius and needs an offset of 64
- the voltage is in 1/256 of 3.3V
The offical datasheet says the voltage needs to be divided by 256,
but this is likely an off-by-one-error, since even the BIOS
devides by 255 (otherwise 3.3V could not be measured).
The voltage channels additionally need a board-specific multiplier,
however this can be done by the driver since its board-specific.
The reason the missing scaling of measurements is the way Fujitsu
used this driver when it was still out-of-tree. Back then, all
scaling was done in userspace by libsensors, even the generic one.
Tested on a Fujitsu DS3401-B1.
Fixes: 08426eda58e0 ("hwmon: Add driver for FTS BMC chip "Teutates"")
Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
---
Documentation/hwmon/ftsteutates.rst | 4 ++++
drivers/hwmon/ftsteutates.c | 19 +++++++++++++------
2 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/Documentation/hwmon/ftsteutates.rst b/Documentation/hwmon/ftsteutates.rst
index 58a2483d8d0d..198fa8e2819d 100644
--- a/Documentation/hwmon/ftsteutates.rst
+++ b/Documentation/hwmon/ftsteutates.rst
@@ -22,6 +22,10 @@ enhancements. It can monitor up to 4 voltages, 16 temperatures and
8 fans. It also contains an integrated watchdog which is currently
implemented in this driver.
+The 4 voltages require a board-specific multiplier, since the BMC can
+only measure voltages up to 3.3V and thus relies on voltage dividers.
+Consult your motherboard manual for details.
+
To clear a temperature or fan alarm, execute the following command with the
correct path to the alarm file::
diff --git a/drivers/hwmon/ftsteutates.c b/drivers/hwmon/ftsteutates.c
index f5b8e724a8ca..ffa0bb364877 100644
--- a/drivers/hwmon/ftsteutates.c
+++ b/drivers/hwmon/ftsteutates.c
@@ -12,6 +12,7 @@
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/jiffies.h>
+#include <linux/math.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
@@ -347,13 +348,15 @@ static ssize_t in_value_show(struct device *dev,
{
struct fts_data *data = dev_get_drvdata(dev);
int index = to_sensor_dev_attr(devattr)->index;
- int err;
+ int value, err;
err = fts_update_device(data);
if (err < 0)
return err;
- return sprintf(buf, "%u\n", data->volt[index]);
+ value = DIV_ROUND_CLOSEST(data->volt[index] * 3300, 255);
+
+ return sprintf(buf, "%d\n", value);
}
static ssize_t temp_value_show(struct device *dev,
@@ -361,13 +364,15 @@ static ssize_t temp_value_show(struct device *dev,
{
struct fts_data *data = dev_get_drvdata(dev);
int index = to_sensor_dev_attr(devattr)->index;
- int err;
+ int value, err;
err = fts_update_device(data);
if (err < 0)
return err;
- return sprintf(buf, "%u\n", data->temp_input[index]);
+ value = (data->temp_input[index] - 64) * 1000;
+
+ return sprintf(buf, "%d\n", value);
}
static ssize_t temp_fault_show(struct device *dev,
@@ -436,13 +441,15 @@ static ssize_t fan_value_show(struct device *dev,
{
struct fts_data *data = dev_get_drvdata(dev);
int index = to_sensor_dev_attr(devattr)->index;
- int err;
+ int value, err;
err = fts_update_device(data);
if (err < 0)
return err;
- return sprintf(buf, "%u\n", data->fan_input[index]);
+ value = data->fan_input[index] * 60;
+
+ return sprintf(buf, "%d\n", value);
}
static ssize_t fan_source_show(struct device *dev,
--
2.30.2
