[PATCH v3 1/5] thermal: of: Extend of-thermal.c to provide number of trip points

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

This patch extends the of-thermal.c to provide information about number of
available trip points.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
---
Changes for v3:
- Exporting of_thermal_get_ntrips symbol as a GPL
- Fix build error when CONFIG_THERMAL_OF is disabled

Changes for v2:
- Provide detailed (doxygen like) description of the of_thermal_get_ntrips()
  method
- Check for data pointer not being NULL
---
 drivers/thermal/of-thermal.c   | 21 +++++++++++++++++++++
 drivers/thermal/thermal_core.h |  5 +++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index b7982f0..7facd23 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -112,6 +112,27 @@ static int of_thermal_get_temp(struct thermal_zone_device *tz,
 	return data->ops->get_temp(data->sensor_data, temp);
 }
 
+/**
+ * of_thermal_get_ntrips - function to export number of available trip
+ *			   points.
+ * @tz: pointer to a thermal zone
+ *
+ * This function is a globally visible wrapper to get number of trip points
+ * stored in the local struct __thermal_zone
+ *
+ * Return: number of available trip points, -ENODEV when data not available
+ */
+int of_thermal_get_ntrips(struct thermal_zone_device *tz)
+{
+	struct __thermal_zone *data = tz->devdata;
+
+	if (!data || IS_ERR(data))
+		return -ENODEV;
+
+	return data->ntrips;
+}
+EXPORT_SYMBOL_GPL(of_thermal_get_ntrips);
+
 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 d15d243..1cc5041 100644
--- a/drivers/thermal/thermal_core.h
+++ b/drivers/thermal/thermal_core.h
@@ -89,9 +89,14 @@ static inline void thermal_gov_user_space_unregister(void) {}
 #ifdef CONFIG_THERMAL_OF
 int of_parse_thermal_zones(void);
 void of_thermal_destroy_zones(void);
+int of_thermal_get_ntrips(struct thermal_zone_device *);
 #else
 static inline int of_parse_thermal_zones(void) { return 0; }
 static inline void of_thermal_destroy_zones(void) { }
+static inline int of_thermal_get_ntrips(struct thermal_zone_device *tz)
+{
+	return 0;
+}
 #endif
 
 #endif /* __THERMAL_CORE_H__ */
-- 
2.0.0.rc2