--- /dev/null
+/*
+ * devres.c -- Voltage/Current Regulator framework devres implementation.
+ *
+ * Copyright 2013 Linaro Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/driver.h>
+#include <linux/module.h>
+
+#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);
+}
+
+static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
+ int get_type)
+{
+ struct regulator **ptr, *regulator;
+
+ ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ switch (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);
+ } else {
+ devres_free(ptr);
+ }
+
+ return regulator;
+}
+
+/**
+ * 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)
+{
+ return _devm_regulator_get(dev, id, NORMAL_GET);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_get);
+
+/**
+ * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
+ * @dev: device for regulator "consumer"
+ * @id: Supply name or regulator ID.
+ *
+ * Managed regulator_get_exclusive(). Regulators returned from this function
+ * are automatically regulator_put() on driver detach. See regulator_get() for
+ * more information.
+ */
+struct regulator *devm_regulator_get_exclusive(struct device *dev,
+ const char *id)
+{
+ return _devm_regulator_get(dev, id, EXCLUSIVE_GET);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);
+
+/**
+ * devm_regulator_get_optional - Resource managed regulator_get_optional()
+ * @dev: device for regulator "consumer"
+ * @id: Supply name or regulator ID.
+ *
+ * Managed regulator_get_optional(). Regulators returned from this
+ * function are automatically regulator_put() on driver detach. See
+ * regulator_get_optional() for more information.
+ */
+struct regulator *devm_regulator_get_optional(struct device *dev,
+ const char *id)
+{
+ return _devm_regulator_get(dev, id, OPTIONAL_GET);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_get_optional);
+
+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_release(regulator->dev, devm_regulator_release,
+ devm_regulator_match, regulator);
+ if (rc != 0)
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_put);
+
+/**
+ * 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 devm_rdev_release(struct device *dev, void *res)
+{
+ regulator_unregister(*(struct regulator_dev **)res);
+}
+
+/**
+ * devm_regulator_register - Resource managed regulator_register()
+ * @regulator_desc: regulator to register
+ * @config: runtime configuration for regulator
+ *
+ * Called by regulator drivers to register a regulator. Returns a
+ * valid pointer to struct regulator_dev on success or an ERR_PTR() on
+ * error. The regulator will automatically be released when the device
+ * is unbound.
+ */
+struct regulator_dev *devm_regulator_register(struct device *dev,
+ const struct regulator_desc *regulator_desc,
+ const struct regulator_config *config)
+{
+ struct regulator_dev **ptr, *rdev;
+
+ ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ rdev = regulator_register(regulator_desc, config);
+ if (!IS_ERR(rdev)) {
+ *ptr = rdev;
+ devres_add(dev, ptr);
+ } else {
+ devres_free(ptr);
+ }
+
+ return rdev;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_register);
+
+static int devm_rdev_match(struct device *dev, void *res, void *data)
+{
+ struct regulator_dev **r = res;
+ if (!r || !*r) {
+ WARN_ON(!r || !*r);
+ return 0;
+ }
+ return *r == data;
+}
+
+/**
+ * devm_regulator_unregister - Resource managed regulator_unregister()
+ * @regulator: regulator to free
+ *
+ * Unregister a regulator registered with devm_regulator_register().
+ * Normally this function will not need to be called and the resource
+ * management code will ensure that the resource is freed.
+ */
+void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev)
+{
+ int rc;
+
+ rc = devres_release(dev, devm_rdev_release, devm_rdev_match, rdev);
+ if (rc != 0)
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_unregister);
+
+struct regulator_supply_alias_match {
+ struct device *dev;
+ const char *id;
+};
+
+static int devm_regulator_match_supply_alias(struct device *dev, void *res,
+ void *data)
+{
+ struct regulator_supply_alias_match *match = res;
+ struct regulator_supply_alias_match *target = data;
+
+ return match->dev == target->dev && strcmp(match->id, target->id) == 0;
+}
+
+static void devm_regulator_destroy_supply_alias(struct device *dev, void *res)
+{
+ struct regulator_supply_alias_match *match = res;
+
+ regulator_unregister_supply_alias(match->dev, match->id);
+}
+
+/**
+ * devm_regulator_register_supply_alias - Resource managed
+ * regulator_register_supply_alias()
+ *
+ * @dev: device that will be given as the regulator "consumer"
+ * @id: Supply name or regulator ID
+ * @alias_dev: device that should be used to lookup the supply
+ * @alias_id: Supply name or regulator ID that should be used to lookup the
+ * supply
+ *
+ * The supply alias will automatically be unregistered when the source
+ * device is unbound.
+ */
+int devm_regulator_register_supply_alias(struct device *dev, const char *id,
+ struct device *alias_dev,
+ const char *alias_id)
+{
+ struct regulator_supply_alias_match *match;
+ int ret;
+
+ match = devres_alloc(devm_regulator_destroy_supply_alias,
+ sizeof(struct regulator_supply_alias_match),
+ GFP_KERNEL);
+ if (!match)
+ return -ENOMEM;
+
+ match->dev = dev;
+ match->id = id;
+
+ ret = regulator_register_supply_alias(dev, id, alias_dev, alias_id);
+ if (ret < 0) {
+ devres_free(match);
+ return ret;
+ }
+
+ devres_add(dev, match);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_register_supply_alias);
+
+/**
+ * devm_regulator_unregister_supply_alias - Resource managed
+ * regulator_unregister_supply_alias()
+ *
+ * @dev: device that will be given as the regulator "consumer"
+ * @id: Supply name or regulator ID
+ *
+ * Unregister an alias registered with
+ * devm_regulator_register_supply_alias(). Normally this function
+ * will not need to be called and the resource management code
+ * will ensure that the resource is freed.
+ */
+void devm_regulator_unregister_supply_alias(struct device *dev, const char *id)
+{
+ struct regulator_supply_alias_match match;
+ int rc;
+
+ match.dev = dev;
+ match.id = id;
+
+ rc = devres_release(dev, devm_regulator_destroy_supply_alias,
+ devm_regulator_match_supply_alias, &match);
+ if (rc != 0)
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_unregister_supply_alias);
+
+/**
+ * devm_regulator_bulk_register_supply_alias - Managed register
+ * multiple aliases
+ *
+ * @dev: device that will be given as the regulator "consumer"
+ * @id: List of supply names or regulator IDs
+ * @alias_dev: device that should be used to lookup the supply
+ * @alias_id: List of supply names or regulator IDs that should be used to
+ * lookup the supply
+ * @num_id: Number of aliases to register
+ *
+ * @return 0 on success, an errno on failure.
+ *
+ * This helper function allows drivers to register several supply
+ * aliases in one operation, the aliases will be automatically
+ * unregisters when the source device is unbound. If any of the
+ * aliases cannot be registered any aliases that were registered
+ * will be removed before returning to the caller.
+ */
+int devm_regulator_bulk_register_supply_alias(struct device *dev,
+ const char *const *id,
+ struct device *alias_dev,
+ const char *const *alias_id,
+ int num_id)
+{
+ int i;
+ int ret;
+
+ for (i = 0; i < num_id; ++i) {
+ ret = devm_regulator_register_supply_alias(dev, id[i],
+ alias_dev,
+ alias_id[i]);
+ if (ret < 0)
+ goto err;
+ }
+
+ return 0;
+
+err:
+ dev_err(dev,
+ "Failed to create supply alias %s,%s -> %s,%s\n",
+ id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
+
+ while (--i >= 0)
+ devm_regulator_unregister_supply_alias(dev, id[i]);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_bulk_register_supply_alias);
+
+/**
+ * devm_regulator_bulk_unregister_supply_alias - Managed unregister
+ * multiple aliases
+ *
+ * @dev: device that will be given as the regulator "consumer"
+ * @id: List of supply names or regulator IDs
+ * @num_id: Number of aliases to unregister
+ *
+ * Unregister aliases registered with
+ * devm_regulator_bulk_register_supply_alias(). Normally this function
+ * will not need to be called and the resource management code
+ * will ensure that the resource is freed.
+ */
+void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
+ const char *const *id,
+ int num_id)
+{
+ int i;
+
+ for (i = 0; i < num_id; ++i)
+ devm_regulator_unregister_supply_alias(dev, id[i]);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_bulk_unregister_supply_alias);
+
+struct regulator_notifier_match {
+ struct regulator *regulator;
+ struct notifier_block *nb;
+};
+
+static int devm_regulator_match_notifier(struct device *dev, void *res,
+ void *data)
+{
+ struct regulator_notifier_match *match = res;
+ struct regulator_notifier_match *target = data;
+
+ return match->regulator == target->regulator && match->nb == target->nb;
+}
+
+static void devm_regulator_destroy_notifier(struct device *dev, void *res)
+{
+ struct regulator_notifier_match *match = res;
+
+ regulator_unregister_notifier(match->regulator, match->nb);
+}
+
+/**
+ * devm_regulator_register_notifier - Resource managed
+ * regulator_register_notifier
+ *
+ * @regulator: regulator source
+ * @nb: notifier block
+ *
+ * The notifier will be registers under the consumer device and be
+ * automatically be unregistered when the source device is unbound.
+ */
+int devm_regulator_register_notifier(struct regulator *regulator,
+ struct notifier_block *nb)
+{
+ struct regulator_notifier_match *match;
+ int ret;
+
+ match = devres_alloc(devm_regulator_destroy_notifier,
+ sizeof(struct regulator_notifier_match),
+ GFP_KERNEL);
+ if (!match)
+ return -ENOMEM;
+
+ match->regulator = regulator;
+ match->nb = nb;
+
+ ret = regulator_register_notifier(regulator, nb);
+ if (ret < 0) {
+ devres_free(match);
+ return ret;
+ }
+
+ devres_add(regulator->dev, match);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_regulator_register_notifier);
+
+/**
+ * devm_regulator_unregister_notifier - Resource managed
+ * regulator_unregister_notifier()
+ *
+ * @regulator: regulator source
+ * @nb: notifier block
+ *
+ * Unregister a notifier registered with devm_regulator_register_notifier().
+ * Normally this function will not need to be called and the resource
+ * management code will ensure that the resource is freed.
+ */
+void devm_regulator_unregister_notifier(struct regulator *regulator,
+ struct notifier_block *nb)
+{
+ struct regulator_notifier_match match;
+ int rc;
+
+ match.regulator = regulator;
+ match.nb = nb;
+
+ rc = devres_release(regulator->dev, devm_regulator_destroy_notifier,
+ devm_regulator_match_notifier, &match);
+ if (rc != 0)
+ WARN_ON(rc);
+}
+EXPORT_SYMBOL_GPL(devm_regulator_unregister_notifier);
Code Review / kvmfornfv.git / blobdiff