Thermal: Add get trend, get instance API's to thermal_sys

This patch adds the following API's to thermal_sys.c, that
can be used by other Thermal drivers.
 * get_tz_trend: obtain the trend of the given thermal zone
 * get_thermal_instance: obtain the instance corresponding
   to the given tz, cdev and the trip point.

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

2 files changed, 44 insertions, 0 deletions

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index bbc834625f7f..1f98c560a88e 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -82,6 +82,46 @@ static void release_idr(struct idr *idr, struct mutex *lock, int id)
                 mutex_unlock(lock);
 }
 
+int get_tz_trend(struct thermal_zone_device *tz, int trip)
+{
+        enum thermal_trend trend;
+
+        if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
+                if (tz->temperature > tz->last_temperature)
+                        trend = THERMAL_TREND_RAISING;
+                else if (tz->temperature < tz->last_temperature)
+                        trend = THERMAL_TREND_DROPPING;
+                else
+                        trend = THERMAL_TREND_STABLE;
+        }
+
+        return trend;
+}
+EXPORT_SYMBOL(get_tz_trend);
+
+struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
+                        struct thermal_cooling_device *cdev, int trip)
+{
+        struct thermal_instance *pos = NULL;
+        struct thermal_instance *target_instance = NULL;
+
+        mutex_lock(&tz->lock);
+        mutex_lock(&cdev->lock);
+
+        list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
+                if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
+                        target_instance = pos;
+                        break;
+                }
+        }
+
+        mutex_unlock(&cdev->lock);
+        mutex_unlock(&tz->lock);
+
+        return target_instance;
+}
+EXPORT_SYMBOL(get_thermal_instance);
+
 /* sys I/F for thermal zone */
 
 #define to_thermal_zone(_dev) \
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 8611e3eba60c..32af124d23cd 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -185,6 +185,10 @@ struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
                 const struct thermal_cooling_device_ops *);
 void thermal_cooling_device_unregister(struct thermal_cooling_device *);
 
+int get_tz_trend(struct thermal_zone_device *, int);
+struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
+                struct thermal_cooling_device *, int);
+
 #ifdef CONFIG_NET
 extern int thermal_generate_netlink_event(u32 orig, enum events event);
 #else