Merge remote-tracking branch 'regulator/topic/core' into regulator-next

drivers/regulator/core.c

@@ -1455,12 +1455,14 @@ static struct regulator_dev *regulator_lookup_by_name(const char *name)
  * lookup could succeed in the future.
  *
  * If successful, returns a struct regulator_dev that corresponds to the name
- * @supply and with the embedded struct device refcount incremented by one,
+ * @supply and with the embedded struct device refcount incremented by one.
- * or NULL on failure. The refcount must be dropped by calling put_device().
+ * The refcount must be dropped by calling put_device().
+ * On failure one of the following ERR-PTR-encoded values is returned:
+ * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
+ * in the future.
  */
 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
-						  const char *supply,
+						  const char *supply)
-						  int *ret)
 {
 	struct regulator_dev *r;
 	struct device_node *node;
@@ -1476,16 +1478,12 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
 			r = of_find_regulator_by_node(node);
 			if (r)
 				return r;
-			*ret = -EPROBE_DEFER;
+
-			return NULL;
-		} else {
 			/*
-			 * If we couldn't even get the node then it's
+			 * We have a node, but there is no device.
-			 * not just that the device didn't register
+			 * assume it has not registered yet.
-			 * yet, there's no node and we'll never
-			 * succeed.
 			 */
-			*ret = -ENODEV;
+			return ERR_PTR(-EPROBE_DEFER);
 		}
 	}
 
@@ -1506,13 +1504,16 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
 
 		if (strcmp(map->supply, supply) == 0 &&
 		    get_device(&map->regulator->dev)) {
-			mutex_unlock(&regulator_list_mutex);
+			r = map->regulator;
-			return map->regulator;
+			break;
 		}
 	}
 	mutex_unlock(&regulator_list_mutex);
 
-	return NULL;
+	if (r)
+		return r;
+
+	return ERR_PTR(-ENODEV);
 }
 
 static int regulator_resolve_supply(struct regulator_dev *rdev)
@@ -1529,8 +1530,10 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
 	if (rdev->supply)
 		return 0;
 
-	r = regulator_dev_lookup(dev, rdev->supply_name, &ret);
+	r = regulator_dev_lookup(dev, rdev->supply_name);
-	if (!r) {
+	if (IS_ERR(r)) {
+		ret = PTR_ERR(r);
+
 		if (ret == -ENODEV) {
 			/*
 			 * No supply was specified for this regulator and
@@ -1580,69 +1583,72 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
 }
 
 /* Internal regulator request function */
-static struct regulator *_regulator_get(struct device *dev, const char *id,
+struct regulator *_regulator_get(struct device *dev, const char *id,
-					bool exclusive, bool allow_dummy)
+				 enum regulator_get_type get_type)
 {
 	struct regulator_dev *rdev;
-	struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
+	struct regulator *regulator;
-	const char *devname = NULL;
+	const char *devname = dev ? dev_name(dev) : "deviceless";
 	int ret;
 
+	if (get_type >= MAX_GET_TYPE) {
+		dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
+		return ERR_PTR(-EINVAL);
+	}
+
 	if (id == NULL) {
 		pr_err("get() with no identifier\n");
 		return ERR_PTR(-EINVAL);
 	}
 
-	if (dev)
+	rdev = regulator_dev_lookup(dev, id);
-		devname = dev_name(dev);
+	if (IS_ERR(rdev)) {
+		ret = PTR_ERR(rdev);
 
-	if (have_full_constraints())
+		/*
-		ret = -ENODEV;
+		 * If regulator_dev_lookup() fails with error other
-	else
+		 * than -ENODEV our job here is done, we simply return it.
-		ret = -EPROBE_DEFER;
+		 */
+		if (ret != -ENODEV)
+			return ERR_PTR(ret);
 
-	rdev = regulator_dev_lookup(dev, id, &ret);
+		if (!have_full_constraints()) {
-	if (rdev)
+			dev_warn(dev,
-		goto found;
+				 "incomplete constraints, dummy supplies not allowed\n");
+			return ERR_PTR(-ENODEV);
+		}
 
-	regulator = ERR_PTR(ret);
+		switch (get_type) {
+		case NORMAL_GET:
+			/*
+			 * Assume that a regulator is physically present and
+			 * enabled, even if it isn't hooked up, and just
+			 * provide a dummy.
+			 */
+			dev_warn(dev,
+				 "%s supply %s not found, using dummy regulator\n",
+				 devname, id);
+			rdev = dummy_regulator_rdev;
+			get_device(&rdev->dev);
+			break;
 
-	/*
+		case EXCLUSIVE_GET:
-	 * If we have return value from dev_lookup fail, we do not expect to
+			dev_warn(dev,
-	 * succeed, so, quit with appropriate error value
+				 "dummy supplies not allowed for exclusive requests\n");
-	 */
+			/* fall through */
-	if (ret && ret != -ENODEV)
-		return regulator;
 
-	if (!devname)
+		default:
-		devname = "deviceless";
+			return ERR_PTR(-ENODEV);
-
+		}
-	/*
-	 * Assume that a regulator is physically present and enabled
-	 * even if it isn't hooked up and just provide a dummy.
-	 */
-	if (have_full_constraints() && allow_dummy) {
-		pr_warn("%s supply %s not found, using dummy regulator\n",
-			devname, id);
-
-		rdev = dummy_regulator_rdev;
-		get_device(&rdev->dev);
-		goto found;
-	/* Don't log an error when called from regulator_get_optional() */
-	} else if (!have_full_constraints() || exclusive) {
-		dev_warn(dev, "dummy supplies not allowed\n");
 	}
 
-	return regulator;
-
-found:
 	if (rdev->exclusive) {
 		regulator = ERR_PTR(-EPERM);
 		put_device(&rdev->dev);
 		return regulator;
 	}
 
-	if (exclusive && rdev->open_count) {
+	if (get_type == EXCLUSIVE_GET && rdev->open_count) {
 		regulator = ERR_PTR(-EBUSY);
 		put_device(&rdev->dev);
 		return regulator;
@@ -1656,6 +1662,7 @@ found:
 	}
 
 	if (!try_module_get(rdev->owner)) {
+		regulator = ERR_PTR(-EPROBE_DEFER);
 		put_device(&rdev->dev);
 		return regulator;
 	}
@@ -1669,7 +1676,7 @@ found:
 	}
 
 	rdev->open_count++;
-	if (exclusive) {
+	if (get_type == EXCLUSIVE_GET) {
 		rdev->exclusive = 1;
 
 		ret = _regulator_is_enabled(rdev);
@@ -1697,7 +1704,7 @@ found:
  */
 struct regulator *regulator_get(struct device *dev, const char *id)
 {
-	return _regulator_get(dev, id, false, true);
+	return _regulator_get(dev, id, NORMAL_GET);
 }
 EXPORT_SYMBOL_GPL(regulator_get);
 
@@ -1724,7 +1731,7 @@ EXPORT_SYMBOL_GPL(regulator_get);
  */
 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
 {
-	return _regulator_get(dev, id, true, false);
+	return _regulator_get(dev, id, EXCLUSIVE_GET);
 }
 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
 
@@ -1750,7 +1757,7 @@ EXPORT_SYMBOL_GPL(regulator_get_exclusive);
  */
 struct regulator *regulator_get_optional(struct device *dev, const char *id)
 {
-	return _regulator_get(dev, id, false, false);
+	return _regulator_get(dev, id, OPTIONAL_GET);
 }
 EXPORT_SYMBOL_GPL(regulator_get_optional);
 
@@ -3660,7 +3667,7 @@ err:
 	for (++i; i < num_consumers; ++i) {
 		r = regulator_enable(consumers[i].consumer);
 		if (r != 0)
-			pr_err("Failed to reename %s: %d\n",
+			pr_err("Failed to re-enable %s: %d\n",
 			       consumers[i].supply, r);
 	}
 
@@ -3686,21 +3693,17 @@ int regulator_bulk_force_disable(int num_consumers,
 			   struct regulator_bulk_data *consumers)
 {
 	int i;
-	int ret;
+	int ret = 0;
 
-	for (i = 0; i < num_consumers; i++)
+	for (i = 0; i < num_consumers; i++) {
 		consumers[i].ret =
 			    regulator_force_disable(consumers[i].consumer);
 
-	for (i = 0; i < num_consumers; i++) {
+		/* Store first error for reporting */
-		if (consumers[i].ret != 0) {
+		if (consumers[i].ret && !ret)
 			ret = consumers[i].ret;
-			goto out;
-		}
 	}
 
-	return 0;
-out:
 	return ret;
 }
 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);

drivers/regulator/devres.c

@@ -19,12 +19,6 @@
 
 #include "internal.h"
 
-enum {
-	NORMAL_GET,
-	EXCLUSIVE_GET,
-	OPTIONAL_GET,
-};
-
 static void devm_regulator_release(struct device *dev, void *res)
 {
 	regulator_put(*(struct regulator **)res);
@@ -39,20 +33,7 @@ static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
 	if (!ptr)
 		return ERR_PTR(-ENOMEM);
 
-	switch (get_type) {
+	regulator = _regulator_get(dev, id, get_type);
-	case NORMAL_GET:
-		regulator = regulator_get(dev, id);
-		break;
-	case EXCLUSIVE_GET:
-		regulator = regulator_get_exclusive(dev, id);
-		break;
-	case OPTIONAL_GET:
-		regulator = regulator_get_optional(dev, id);
-		break;
-	default:
-		regulator = ERR_PTR(-EINVAL);
-	}
-
 	if (!IS_ERR(regulator)) {
 		*ptr = regulator;
 		devres_add(dev, ptr);
@@ -139,6 +120,18 @@ void devm_regulator_put(struct regulator *regulator)
 }
 EXPORT_SYMBOL_GPL(devm_regulator_put);
 
+struct regulator_bulk_devres {
+	struct regulator_bulk_data *consumers;
+	int num_consumers;
+};
+
+static void devm_regulator_bulk_release(struct device *dev, void *res)
+{
+	struct regulator_bulk_devres *devres = res;
+
+	regulator_bulk_free(devres->num_consumers, devres->consumers);
+}
+
 /**
  * devm_regulator_bulk_get - managed get multiple regulator consumers
  *
@@ -157,30 +150,23 @@ EXPORT_SYMBOL_GPL(devm_regulator_put);
 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
 			    struct regulator_bulk_data *consumers)
 {
-	int i;
+	struct regulator_bulk_devres *devres;
 	int ret;
 
-	for (i = 0; i < num_consumers; i++)
+	devres = devres_alloc(devm_regulator_bulk_release,
-		consumers[i].consumer = NULL;
+			      sizeof(*devres), GFP_KERNEL);
+	if (!devres)
+		return -ENOMEM;
 
-	for (i = 0; i < num_consumers; i++) {
+	ret = regulator_bulk_get(dev, num_consumers, consumers);
-		consumers[i].consumer = devm_regulator_get(dev,
+	if (!ret) {
-							   consumers[i].supply);
+		devres->consumers = consumers;
-		if (IS_ERR(consumers[i].consumer)) {
+		devres->num_consumers = num_consumers;
-			ret = PTR_ERR(consumers[i].consumer);
+		devres_add(dev, devres);
-			dev_err(dev, "Failed to get supply '%s': %d\n",
+	} else {
-				consumers[i].supply, ret);
+		devres_free(devres);
-			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);

drivers/regulator/internal.h

@@ -51,4 +51,14 @@ regulator_of_get_init_data(struct device *dev,
 }
 #endif
 
+enum regulator_get_type {
+	NORMAL_GET,
+	EXCLUSIVE_GET,
+	OPTIONAL_GET,
+	MAX_GET_TYPE
+};
+
+struct regulator *_regulator_get(struct device *dev, const char *id,
+				 enum regulator_get_type get_type);
+
 #endif