regulator: Implement devm_regulator_free()

Allow consumers to free regulators allocated using devm_regulator_get()
if they need to. This will not normally be required.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 214640db084b..88bcb111ca68 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1421,6 +1421,34 @@ void regulator_put(struct regulator *regulator)
 }
 EXPORT_SYMBOL_GPL(regulator_put);
 
+static int devm_regulator_match(struct device *dev, void *res, void *data)
+{
+        struct regulator **r = res;
+        if (!r || !*r) {
+                WARN_ON(!r || !*r);
+                return 0;
+        }
+        return *r == data;
+}
+
+/**
+ * devm_regulator_put - Resource managed regulator_put()
+ * @regulator: regulator to free
+ *
+ * Deallocate a regulator allocated with devm_regulator_get(). Normally
+ * this function will not need to be called and the resource management
+ * code will ensure that the resource is freed.
+ */
+void devm_regulator_put(struct regulator *regulator)
+{
+        int rc;
+
+        rc = devres_destroy(regulator->dev, devm_regulator_release,
+                            devm_regulator_match, regulator);
+        WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_put);
+
 static int _regulator_can_change_status(struct regulator_dev *rdev)
 {
         if (!rdev->constraints)