253 lines
6.7 KiB
C
253 lines
6.7 KiB
C
/*
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* devres.c -- Voltage/Current Regulator framework devres implementation.
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*
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* Copyright 2013 Linaro Ltd
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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#include <linux/regulator/driver.h>
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#include <linux/module.h>
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#include "internal.h"
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enum {
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NORMAL_GET,
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EXCLUSIVE_GET,
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OPTIONAL_GET,
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};
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static void devm_regulator_release(struct device *dev, void *res)
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{
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regulator_put(*(struct regulator **)res);
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}
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static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
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int get_type)
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{
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struct regulator **ptr, *regulator;
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ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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switch (get_type) {
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case NORMAL_GET:
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regulator = regulator_get(dev, id);
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break;
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case EXCLUSIVE_GET:
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regulator = regulator_get_exclusive(dev, id);
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break;
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case OPTIONAL_GET:
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regulator = regulator_get_optional(dev, id);
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break;
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default:
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regulator = ERR_PTR(-EINVAL);
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}
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if (!IS_ERR(regulator)) {
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*ptr = regulator;
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devres_add(dev, ptr);
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} else {
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devres_free(ptr);
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}
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return regulator;
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}
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/**
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* devm_regulator_get - Resource managed regulator_get()
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* @dev: device for regulator "consumer"
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* @id: Supply name or regulator ID.
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*
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* Managed regulator_get(). Regulators returned from this function are
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* automatically regulator_put() on driver detach. See regulator_get() for more
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* information.
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*/
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struct regulator *devm_regulator_get(struct device *dev, const char *id)
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{
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return _devm_regulator_get(dev, id, NORMAL_GET);
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}
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EXPORT_SYMBOL_GPL(devm_regulator_get);
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/**
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* devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
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* @dev: device for regulator "consumer"
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* @id: Supply name or regulator ID.
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*
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* Managed regulator_get_exclusive(). Regulators returned from this function
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* are automatically regulator_put() on driver detach. See regulator_get() for
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* more information.
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*/
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struct regulator *devm_regulator_get_exclusive(struct device *dev,
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const char *id)
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{
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return _devm_regulator_get(dev, id, EXCLUSIVE_GET);
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}
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EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);
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/**
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* devm_regulator_get_optional - Resource managed regulator_get_optional()
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* @dev: device for regulator "consumer"
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* @id: Supply name or regulator ID.
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*
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* Managed regulator_get_optional(). Regulators returned from this
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* function are automatically regulator_put() on driver detach. See
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* regulator_get_optional() for more information.
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*/
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struct regulator *devm_regulator_get_optional(struct device *dev,
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const char *id)
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{
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return _devm_regulator_get(dev, id, OPTIONAL_GET);
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}
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EXPORT_SYMBOL_GPL(devm_regulator_get_optional);
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static int devm_regulator_match(struct device *dev, void *res, void *data)
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{
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struct regulator **r = res;
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if (!r || !*r) {
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WARN_ON(!r || !*r);
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return 0;
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}
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return *r == data;
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}
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/**
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* devm_regulator_put - Resource managed regulator_put()
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* @regulator: regulator to free
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*
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* Deallocate a regulator allocated with devm_regulator_get(). Normally
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* this function will not need to be called and the resource management
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* code will ensure that the resource is freed.
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*/
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void devm_regulator_put(struct regulator *regulator)
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{
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int rc;
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rc = devres_release(regulator->dev, devm_regulator_release,
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devm_regulator_match, regulator);
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if (rc != 0)
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WARN_ON(rc);
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}
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EXPORT_SYMBOL_GPL(devm_regulator_put);
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/**
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* devm_regulator_bulk_get - managed get multiple regulator consumers
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*
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* @dev: Device to supply
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* @num_consumers: Number of consumers to register
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* @consumers: Configuration of consumers; clients are stored here.
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*
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* @return 0 on success, an errno on failure.
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*
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* This helper function allows drivers to get several regulator
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* consumers in one operation with management, the regulators will
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* automatically be freed when the device is unbound. If any of the
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* regulators cannot be acquired then any regulators that were
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* allocated will be freed before returning to the caller.
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*/
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int devm_regulator_bulk_get(struct device *dev, int num_consumers,
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struct regulator_bulk_data *consumers)
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{
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int i;
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int ret;
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for (i = 0; i < num_consumers; i++)
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consumers[i].consumer = NULL;
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for (i = 0; i < num_consumers; i++) {
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consumers[i].consumer = devm_regulator_get(dev,
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consumers[i].supply);
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if (IS_ERR(consumers[i].consumer)) {
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ret = PTR_ERR(consumers[i].consumer);
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dev_err(dev, "Failed to get supply '%s': %d\n",
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consumers[i].supply, ret);
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consumers[i].consumer = NULL;
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goto err;
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}
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}
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return 0;
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err:
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for (i = 0; i < num_consumers && consumers[i].consumer; i++)
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devm_regulator_put(consumers[i].consumer);
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return ret;
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}
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EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
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static void devm_rdev_release(struct device *dev, void *res)
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{
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regulator_unregister(*(struct regulator_dev **)res);
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}
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/**
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* devm_regulator_register - Resource managed regulator_register()
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* @regulator_desc: regulator to register
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* @config: runtime configuration for regulator
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*
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* Called by regulator drivers to register a regulator. Returns a
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* valid pointer to struct regulator_dev on success or an ERR_PTR() on
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* error. The regulator will automatically be released when the device
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* is unbound.
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*/
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struct regulator_dev *devm_regulator_register(struct device *dev,
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const struct regulator_desc *regulator_desc,
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const struct regulator_config *config)
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{
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struct regulator_dev **ptr, *rdev;
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ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
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GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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rdev = regulator_register(regulator_desc, config);
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if (!IS_ERR(rdev)) {
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*ptr = rdev;
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devres_add(dev, ptr);
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} else {
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devres_free(ptr);
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}
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return rdev;
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}
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EXPORT_SYMBOL_GPL(devm_regulator_register);
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static int devm_rdev_match(struct device *dev, void *res, void *data)
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{
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struct regulator_dev **r = res;
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if (!r || !*r) {
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WARN_ON(!r || !*r);
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return 0;
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}
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return *r == data;
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}
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/**
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* devm_regulator_unregister - Resource managed regulator_unregister()
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* @regulator: regulator to free
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*
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* Unregister a regulator registered with devm_regulator_register().
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* Normally this function will not need to be called and the resource
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* management code will ensure that the resource is freed.
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*/
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void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev)
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{
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int rc;
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rc = devres_release(dev, devm_rdev_release, devm_rdev_match, rdev);
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if (rc != 0)
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WARN_ON(rc);
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}
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EXPORT_SYMBOL_GPL(devm_regulator_unregister);
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