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-rw-r--r--drivers/thermal/thermal_core.c38
-rw-r--r--include/linux/thermal.h1
2 files changed, 39 insertions, 0 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 4cdc3e32722..5045473485c 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1754,6 +1754,44 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
}
EXPORT_SYMBOL(thermal_zone_device_unregister);
+/**
+ * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
+ * @name: thermal zone name to fetch the temperature
+ *
+ * When only one zone is found with the passed name, returns a reference to it.
+ *
+ * Return: On success returns a reference to an unique thermal zone with
+ * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
+ * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
+ */
+struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
+{
+ struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
+ unsigned int found = 0;
+
+ if (!name)
+ goto exit;
+
+ mutex_lock(&thermal_list_lock);
+ list_for_each_entry(pos, &thermal_tz_list, node)
+ if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
+ found++;
+ ref = pos;
+ }
+ mutex_unlock(&thermal_list_lock);
+
+ /* nothing has been found, thus an error code for it */
+ if (found == 0)
+ ref = ERR_PTR(-ENODEV);
+ else if (found > 1)
+ /* Success only when an unique zone is found */
+ ref = ERR_PTR(-EEXIST);
+
+exit:
+ return ref;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
+
#ifdef CONFIG_NET
static struct genl_family thermal_event_genl_family = {
.id = GENL_ID_GENERATE,
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 3bda306f7a5..9af2f3a9965 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -239,6 +239,7 @@ void thermal_zone_device_update(struct thermal_zone_device *);
struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
const struct thermal_cooling_device_ops *);
void thermal_cooling_device_unregister(struct thermal_cooling_device *);
+struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
int get_tz_trend(struct thermal_zone_device *, int);
struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,