hwmon: (lm90) Support the extra resolution bits of MAX6657
The Maxim MAX6657, MAX6658 and MAX6659 have extra resolution bits for
the local temperature measurement. Let the lm90 driver read them and
export them to user-space.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Martyn Welch <martyn.welch@gefanuc.com>
diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90
index aa4a0ec..0b3e8bb 100644
--- a/Documentation/hwmon/lm90
+++ b/Documentation/hwmon/lm90
@@ -86,9 +86,8 @@
increased resolution of the remote temperature measurement.
The different chipsets of the family are not strictly identical, although
-very similar. This driver doesn't handle any specific feature for now,
-with the exception of SMBus PEC. For reference, here comes a non-exhaustive
-list of specific features:
+very similar. For reference, here comes a non-exhaustive list of specific
+features:
LM90:
* Filter and alert configuration register at 0xBF.
@@ -114,9 +113,11 @@
* Lower resolution for remote temperature
MAX6657 and MAX6658:
+ * Better local resolution
* Remote sensor type selection
MAX6659:
+ * Better local resolution
* Selectable address
* Second critical temperature limit
* Remote sensor type selection
@@ -127,7 +128,8 @@
All temperature values are given in degrees Celsius. Resolution
is 1.0 degree for the local temperature, 0.125 degree for the remote
-temperature.
+temperature, except for the MAX6657, MAX6658 and MAX6659 which have a
+resolution of 0.125 degree for both temperatures.
Each sensor has its own high and low limits, plus a critical limit.
Additionally, there is a relative hysteresis value common to both critical