thermal: of: Extend of-thermal.c to provide check if trip point is valid

This patch extends the of-thermal.c to provide check if trip point is
valid.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

2 files changed, 27 insertions, 0 deletions

diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index 7facd23b1d9b..87b9cfe28eb8 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -133,6 +133,27 @@ int of_thermal_get_ntrips(struct thermal_zone_device *tz)
 }
 EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
 
+/**
+ * of_thermal_is_trip_valid - function to check if trip point is valid
+ *
+ * @tz: pointer to a thermal zone
+ * @trip:       trip point to evaluate
+ *
+ * This function is responsible for checking if passed trip point is valid
+ *
+ * Return: true if trip point is valid, false otherwise
+ */
+bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip)
+{
+        struct __thermal_zone *data = tz->devdata;
+
+        if (!data || trip >= data->ntrips || trip < 0)
+                return false;
+
+        return true;
+}
+EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid);
+
 static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
                                 enum thermal_trend *trend)
 {
diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
index 1cc5041b7a26..58a0dfa44705 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -90,6 +90,7 @@ static inline void thermal_gov_user_space_unregister(void) {}
 int of_parse_thermal_zones(void);
 void of_thermal_destroy_zones(void);
 int of_thermal_get_ntrips(struct thermal_zone_device *);
+bool of_thermal_is_trip_valid(struct thermal_zone_device *, int);
 #else
 static inline int of_parse_thermal_zones(void) { return 0; }
 static inline void of_thermal_destroy_zones(void) { }
@@ -97,6 +98,11 @@ static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
 {
         return 0;
 }
+static inline bool of_thermal_is_trip_valid(struct thermal_zone_device *tz,
+                                            int trip)
+{
+        return 0;
+}
 #endif
 
 #endif /* __THERMAL_CORE_H__ */