Thermal: Add a notification API

This patch adds a notification API which the sensor drivers'
can use to notify the framework. The framework then takes
care of the throttling according to the configured policy.

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

drivers/thermal/thermal_sys.c

@@ -1368,6 +1368,24 @@ void thermal_cdev_update(struct thermal_cooling_device *cdev)
 }
 EXPORT_SYMBOL(thermal_cdev_update);
 
+/**
+ * notify_thermal_framework - Sensor drivers use this API to notify framework
+ * @tz:		thermal zone device
+ * @trip:	indicates which trip point has been crossed
+ *
+ * This function handles the trip events from sensor drivers. It starts
+ * throttling the cooling devices according to the policy configured.
+ * For CRITICAL and HOT trip points, this notifies the respective drivers,
+ * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
+ * The throttling policy is based on the configured platform data; if no
+ * platform data is provided, this uses the step_wise throttling policy.
+ */
+void notify_thermal_framework(struct thermal_zone_device *tz, int trip)
+{
+	handle_thermal_trip(tz, trip);
+}
+EXPORT_SYMBOL(notify_thermal_framework);
+
 /**
  * create_trip_attrs - create attributes for trip points
  * @tz:		the thermal zone device

include/linux/thermal.h

@@ -232,6 +232,7 @@ int get_tz_trend(struct thermal_zone_device *, int);
 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
 		struct thermal_cooling_device *, int);
 void thermal_cdev_update(struct thermal_cooling_device *);
+void notify_thermal_framework(struct thermal_zone_device *, int);
 
 int thermal_register_governor(struct thermal_governor *);
 void thermal_unregister_governor(struct thermal_governor *);