[PATCH v2 3/4] thermal: of: Extend of-thermal to export table of trip points

[Lukasz Majewski <l.majewski@samsung.com>]

This patch extends the of-thermal.c to export copy of trip points for
a given thermal zone.

Thermal drivers should use of_thermal_get_trip_points() method to get
pointer to table of thermal trip points.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
---
Changes for v2:
- New patch - as suggested by Eduardo Valentin
---
 drivers/thermal/of-thermal.c   | 33 +++++++++++++++++++++++++++++++++
 drivers/thermal/thermal_core.h |  7 +++++++
 include/linux/thermal.h        | 14 ++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index 336af7f..33921c5 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -89,6 +89,7 @@ struct __thermal_zone {
 	/* trip data */
 	int ntrips;
 	struct __thermal_trip *trips;
+	struct thermal_trip *gtrips;
 
 	/* cooling binding data */
 	int num_tbps;
@@ -152,6 +153,27 @@ bool of_thermal_is_trip_en(struct thermal_zone_device *tz, int trip)
 	return true;
 }
 
+/**
+ * of_thermal_get_trip_points - function to get access to a globally exported
+ *				trip points
+ *
+ * @tz:	pointer to a thermal zone
+ *
+ * This function provides a pointer to the copy of trip points table
+ *
+ * Return: pointer to trip points table, NULL otherwise
+ */
+const struct thermal_trip * const
+of_thermal_get_trip_points(struct thermal_zone_device *tz)
+{
+	struct __thermal_zone *data = tz->devdata;
+
+	if (!data)
+		return NULL;
+
+	return data->gtrips;
+}
+
 static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
 				enum thermal_trend *trend)
 {
@@ -767,6 +789,16 @@ thermal_of_build_thermal_zone(struct device_node *np)
 			goto free_tbps;
 	}
 
+	tz->gtrips = kcalloc(tz->ntrips, sizeof(*tz->gtrips), GFP_KERNEL);
+	if (!tz->gtrips) {
+		ret = -ENOMEM;
+		goto free_tbps;
+	}
+
+	for (i = 0; i < tz->ntrips; i++)
+		memcpy(&(tz->gtrips[i]), &(tz->trips[i].temperature),
+		       sizeof(*tz->gtrips));
+
 finish:
 	of_node_put(child);
 	tz->mode = THERMAL_DEVICE_DISABLED;
@@ -793,6 +825,7 @@ static inline void of_thermal_free_zone(struct __thermal_zone *tz)
 {
 	int i;
 
+	kfree(tz->gtrips);
 	for (i = 0; i < tz->num_tbps; i++)
 		of_node_put(tz->tbps[i].cooling_device);
 	kfree(tz->tbps);
diff --git a/drivers/thermal/thermal_core.h b/drivers/thermal/thermal_core.h
index 466208c..a9580ca 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -91,6 +91,8 @@ 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_en(struct thermal_zone_device *, int);
+const struct thermal_trip * const
+of_thermal_get_trip_points(struct thermal_zone_device *);
 #else
 static inline int of_parse_thermal_zones(void) { return 0; }
 static inline void of_thermal_destroy_zones(void) { }
@@ -102,6 +104,11 @@ static inline bool of_thermal_is_trip_en(struct thermal_zone_device *, int)
 {
 	return 0;
 }
+static inline const struct thermal_trip * const
+of_thermal_get_trip_points(struct thermal_zone_device *)
+{
+	return NULL;
+}
 #endif
 
 #endif /* __THERMAL_CORE_H__ */
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 5bc28a7..88d7249 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -303,6 +303,20 @@ struct thermal_zone_of_device_ops {
 	int (*get_trend)(void *, long *);
 };
 
+/**
+ * struct thermal_trip - Structure representing themal trip points exported from
+ *                       of-thermal
+ *
+ * @temperature:	trip point temperature
+ * @hysteresis:		trip point hysteresis
+ * @type:		trip point type
+ */
+struct thermal_trip {
+	unsigned long int temperature;
+	unsigned long int hysteresis;
+	enum thermal_trip_type type;
+};
+
 /* Function declarations */
 #ifdef CONFIG_THERMAL_OF
 struct thermal_zone_device *
-- 
2.0.0.rc2