Thermal: Add Hysteresis attributes

The Linux Thermal Framework does not support hysteresis
attributes. Most thermal sensors, today, have a
hysteresis value associated with trip points.

This patch adds hysteresis attributes on a per-trip-point
basis, to the Thermal Framework. These attributes are
optionally writable.

Signed-off-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 6eaf9146c847..cfc8d908892e 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -60,6 +60,10 @@ struct thermal_zone_device_ops {
                               unsigned long *);
         int (*set_trip_temp) (struct thermal_zone_device *, int,
                               unsigned long);
+        int (*get_trip_hyst) (struct thermal_zone_device *, int,
+                              unsigned long *);
+        int (*set_trip_hyst) (struct thermal_zone_device *, int,
+                              unsigned long);
         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
         int (*notify) (struct thermal_zone_device *, int,
                        enum thermal_trip_type);
@@ -98,6 +102,7 @@ struct thermal_zone_device {
         struct device device;
         struct thermal_attr *trip_temp_attrs;
         struct thermal_attr *trip_type_attrs;
+        struct thermal_attr *trip_hyst_attrs;
         void *devdata;
         int trips;
         int tc1;