hwmon: (coretemp) Add core/pkg threshold support to Coretemp

This patch adds the core and pkg support to coretemp.
These thresholds can be configured via the sysfs interfaces tempX_max
and tempX_max_hyst. An interrupt is generated when CPU temperature reaches
or crosses above tempX_max OR drops below tempX_max_hyst.

This patch is based on the documentation in IA Manual vol 3A, that can be
downloaded from here:
http://download.intel.com/design/processor/manuals/253668.pdf

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp
index f85e913a3401..fa8776ab9b18 100644
--- a/Documentation/hwmon/coretemp
+++ b/Documentation/hwmon/coretemp
@@ -35,6 +35,13 @@ the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
 All Sysfs entries are named with their core_id (represented here by 'X').
 tempX_input      - Core temperature (in millidegrees Celsius).
 tempX_max        - All cooling devices should be turned on (on Core2).
+                   Initialized with IA32_THERM_INTERRUPT. When the CPU
+                   temperature reaches this temperature, an interrupt is
+                   generated and tempX_max_alarm is set.
+tempX_max_hyst   - If the CPU temperature falls below than temperature,
+                   an interrupt is generated and tempX_max_alarm is reset.
+tempX_max_alarm  - Set if the temperature reaches or exceeds tempX_max.
+                   Reset if the temperature drops to or below tempX_max_hyst.
 tempX_crit       - Maximum junction temperature (in millidegrees Celsius).
 tempX_crit_alarm - Set when Out-of-spec bit is set, never clears.
                    Correct CPU operation is no longer guaranteed.