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>

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index b246d4589348819dd6262cc3270fc08909784f5a..798c628b189584aa17b10a2630933e184ff7aae1 100644 (file)
--- 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 8611e3eba60cb132888399494567fd9d76112db5..32af124d23cd9cd4c800a15c42d3dc6ad3ebcb08 100644 (file)
--- 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