regulator: Provide devm_regulator_bulk_get()

Allow drivers to benefit from both the bulk APIs and managed resources
simultaneously.

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

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 88bcb11..1432c22 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2463,6 +2463,52 @@ 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 60c2f99..35c4283 100644 (file)
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -148,6 +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,