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authorEduardo Valentin <eduardo.valentin@ti.com>2013-04-05 12:32:28 +0000
committerZhang Rui <rui.zhang@intel.com>2013-04-15 09:34:28 +0800
commit63c4d919cf66b1b3ffa7861bddb50a697914af5b (patch)
tree374ed703373b2e25a4fd3f528a2a2b6f8a084cd6 /drivers
parentd13cb03aef0c062dcdd16b411bd4c02c1574ff08 (diff)
downloadvexpress-lsk-63c4d919cf66b1b3ffa7861bddb50a697914af5b.tar.gz
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). Cc: Durgadoss R <durgadoss.r@intel.com> Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> Acked-by: Durgadoss R <durgadoss.r@intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/thermal/thermal_core.c38
1 files changed, 38 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,