hwmon: (tmp401) Add documentation

Documentation for the tmp401 driver.

The documentation describes the tmp401 driver and the supported Texas
Instruments TMP401 and TMP411 temperature sensor chips.

Further documentation for new sysfs attributes supported by this
driver is added to Documentation/hwmon/sysfs-interface.

Signed-off-by: Andre Prendel <andre.prendel@gmx.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/Documentation/hwmon/sysfs-interface b/Documentation/hwmon/sysfs-interface
index 004ee161721..dcbd502c879 100644
--- 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