thermal: introduce thermal_zone_get_zone_by_name helper function

This patch adds a helper function to get a reference of
a thermal zone, based on the zone type name.

It will perform a zone name lookup and return a reference
to a thermal zone device that matches the name requested.
In case the zone is not found or when several zones match
same name or if the required parameters are invalid, it will return
the corresponding error code (ERR_PTR).

Acked-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 1a19a2f4ba2744b7a7d06abe1f949224f83ad3c5..06f5123dc371990c1c2d95c9ca43112c4cfcccab 100644 (file)
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -1763,6 +1763,44 @@ 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 f0bd7f90a90d45d3aeeb3aed8bc2d2f8295c8be0..32c3458a331ccbbf6b8de18b049d1f3eae9f1f4c 100644 (file)
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -237,6 +237,7 @@ 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 *,