hwmon: (tmp421) Add documentation

[safe/jmp/linux-2.6] / Documentation / hwmon / sysfs-interface

diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index 004ee16..dcbd502 100644 (file)
--- a/Documentation/hwmon/sysfs-interface
+++ b/Documentation/hwmon/sysfs-interface
@@ -70,6 +70,7 @@ are interpreted as 0! For more on how written strings are interpreted see the
 [0-*]  denotes any positive number starting from 0
 [1-*]  denotes any positive number starting from 1
 RO     read only value
+WO     write only value
 RW     read/write value
 
 Read/write values may be read-only for some chips, depending on the
@@ -295,6 +296,24 @@ temp[1-*]_label    Suggested temperature channel label.
                user-space.
                RO
 
+temp[1-*]_lowest
+               Historical minimum temperature
+               Unit: millidegree Celsius
+               RO
+
+temp[1-*]_highest
+               Historical maximum temperature
+               Unit: millidegree Celsius
+               RO
+
+temp[1-*]_reset_history
+               Reset temp_lowest and temp_highest
+               WO
+
+temp_reset_history
+               Reset temp_lowest and temp_highest for all sensors
+               WO
+
 Some chips measure temperature using external thermistors and an ADC, and
 report the temperature measurement as a voltage. Converting this voltage
 back to a temperature (or the other way around for limits) requires