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authorJean Delvare <khali@linux-fr.org>2010-08-14 21:08:59 +0200
committerJean Delvare <khali@linux-fr.org>2010-08-14 21:08:59 +0200
commit008e5f3350e0a474baff3ed3eb4f79653a6b6745 (patch)
treeb2a2b27fd68b6071bbe3f2560df477d39d2ddb24 /Documentation
parent9d32df192d2e4db4d59f26a3ea73601bd1a733e5 (diff)
downloadlinux-linaro-android-008e5f3350e0a474baff3ed3eb4f79653a6b6745.tar.gz
hwmon: (pc87427) Add temperature monitoring support
Add support for the 6 temperature monitoring channels of the PC87427. Note that the sensors resolution can vary, and I couldn't find a way to figure it out, so we might have to compensate in user-space. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwmon/pc8742714
1 files changed, 13 insertions, 1 deletions
diff --git a/Documentation/hwmon/pc87427 b/Documentation/hwmon/pc87427
index 3282bf39d67..8fdd08c9e48 100644
--- a/Documentation/hwmon/pc87427
+++ b/Documentation/hwmon/pc87427
@@ -18,7 +18,8 @@ Description
The National Semiconductor Super I/O chip includes complete hardware
monitoring capabilities. It can monitor up to 18 voltages, 8 fans and
-6 temperature sensors. Only the fans are supported at the moment.
+6 temperature sensors. Only the fans and temperatures are supported at
+the moment, voltages aren't.
This chip also has fan controlling features (up to 4 PWM outputs),
which are partly supported by this driver.
@@ -45,3 +46,14 @@ Fan speed can be controlled by PWM outputs. There are 4 possible modes:
always off, always on, manual and automatic. The latter isn't supported
by the driver: you can only return to that mode if it was the original
setting, and the configuration interface is missing.
+
+
+Temperature Monitoring
+----------------------
+
+The PC87427 relies on external sensors (following the SensorPath
+standard), so the resolution and range depend on the type of sensor
+connected. The integer part can be 8-bit or 9-bit, and can be signed or
+not. I couldn't find a way to figure out the external sensor data
+temperature format, so user-space adjustment (typically by a factor 2)
+may be required.