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>

1 files changed, 21 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)
 {