3 files changed, 135 insertions, 0 deletions

diff --git a/Documentation/driver-model/devres.txt b/Documentation/driver-model/devres.txt
index 41c0c5d1ba1..2a596a4fc23 100644
--- a/Documentation/driver-model/devres.txt
+++ b/Documentation/driver-model/devres.txt
@@ -271,3 +271,8 @@ IOMAP
   pcim_iounmap()
   pcim_iomap_table()    : array of mapped addresses indexed by BAR
   pcim_iomap_regions()  : do request_region() and iomap() on multiple BARs
+
+REGULATOR
+  devm_regulator_get()
+  devm_regulator_put()
+  devm_regulator_bulk_get()
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 8f11d0eb59a..f4d31830f12 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1316,6 +1316,40 @@ struct regulator *regulator_get(struct device *dev, const char *id)
 }
 EXPORT_SYMBOL_GPL(regulator_get);
 
+static void devm_regulator_release(struct device *dev, void *res)
+{
+        regulator_put(*(struct regulator **)res);
+}
+
+/**
+ * devm_regulator_get - Resource managed regulator_get()
+ * @dev: device for regulator "consumer"
+ * @id: Supply name or regulator ID.
+ *
+ * Managed regulator_get(). Regulators returned from this function are
+ * automatically regulator_put() on driver detach. See regulator_get() for more
+ * information.
+ */
+struct regulator *devm_regulator_get(struct device *dev, const char *id)
+{
+        struct regulator **ptr, *regulator;
+
+        ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
+        if (!ptr)
+                return ERR_PTR(-ENOMEM);
+
+        regulator = regulator_get(dev, id);
+        if (!IS_ERR(regulator)) {
+                *ptr = regulator;
+                devres_add(dev, ptr);
+        } else {
+                devres_free(ptr);
+        }
+
+        return regulator;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_get);
+
 /**
  * regulator_get_exclusive - obtain exclusive access to a regulator.
  * @dev: device for regulator "consumer"
@@ -1381,6 +1415,34 @@ 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)
@@ -2399,6 +2461,52 @@ err:
 }
 EXPORT_SYMBOL_GPL(regulator_bulk_get);
 
+/**
+ * devm_regulator_bulk_get - managed get multiple regulator consumers
+ *
+ * @dev:           Device to supply
+ * @num_consumers: Number of consumers to register
+ * @consumers:     Configuration of consumers; clients are stored here.
+ *
+ * @return 0 on success, an errno on failure.
+ *
+ * This helper function allows drivers to get several regulator
+ * consumers in one operation with management, the regulators will
+ * automatically be freed when the device is unbound.  If any of the
+ * regulators cannot be acquired then any regulators that were
+ * allocated will be freed before returning to the caller.
+ */
+int devm_regulator_bulk_get(struct device *dev, int num_consumers,
+                            struct regulator_bulk_data *consumers)
+{
+        int i;
+        int ret;
+
+        for (i = 0; i < num_consumers; i++)
+                consumers[i].consumer = NULL;
+
+        for (i = 0; i < num_consumers; i++) {
+                consumers[i].consumer = devm_regulator_get(dev,
+                                                           consumers[i].supply);
+                if (IS_ERR(consumers[i].consumer)) {
+                        ret = PTR_ERR(consumers[i].consumer);
+                        dev_err(dev, "Failed to get supply '%s': %d\n",
+                                consumers[i].supply, ret);
+                        consumers[i].consumer = NULL;
+                        goto err;
+                }
+        }
+
+        return 0;
+
+err:
+        for (i = 0; i < num_consumers && consumers[i].consumer; i++)
+                devm_regulator_put(consumers[i].consumer);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
+
 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
 {
         struct regulator_bulk_data *bulk = data;
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index f2698a0edfc..b6c8d717c7e 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -132,9 +132,12 @@ struct regulator_bulk_data {
 /* regulator get and put */
 struct regulator *__must_check regulator_get(struct device *dev,
                                              const char *id);
+struct regulator *__must_check devm_regulator_get(struct device *dev,
+                                             const char *id);
 struct regulator *__must_check regulator_get_exclusive(struct device *dev,
                                                        const char *id);
 void regulator_put(struct regulator *regulator);
+void devm_regulator_put(struct regulator *regulator);
 
 /* regulator output control and status */
 int regulator_enable(struct regulator *regulator);
@@ -145,6 +148,8 @@ int regulator_disable_deferred(struct regulator *regulator, int ms);
 
 int regulator_bulk_get(struct device *dev, int num_consumers,
                        struct regulator_bulk_data *consumers);
+int devm_regulator_bulk_get(struct device *dev, int num_consumers,
+                            struct regulator_bulk_data *consumers);
 int regulator_bulk_enable(int num_consumers,
                           struct regulator_bulk_data *consumers);
 int regulator_bulk_disable(int num_consumers,
@@ -200,10 +205,21 @@ static inline struct regulator *__must_check regulator_get(struct device *dev,
          */
         return NULL;
 }
+
+static inline struct regulator *__must_check
+devm_regulator_get(struct device *dev, const char *id)
+{
+        return NULL;
+}
+
 static inline void regulator_put(struct regulator *regulator)
 {
 }
 
+static inline void devm_regulator_put(struct regulator *regulator)
+{
+}
+
 static inline int regulator_enable(struct regulator *regulator)
 {
         return 0;
@@ -237,6 +253,12 @@ static inline int regulator_bulk_get(struct device *dev,
         return 0;
 }
 
+static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers,
+                                          struct regulator_bulk_data *consumers)
+{
+        return 0;
+}
+
 static inline int regulator_bulk_enable(int num_consumers,
                                         struct regulator_bulk_data *consumers)
 {