83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
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/**
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* @file random.h
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*
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* @brief Public APIs for the random driver.
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*/
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/*
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* Copyright (c) 2016 ARM Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __RANDOM_H__
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#define __RANDOM_H__
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/**
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* @brief Random Interface
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* @defgroup random_interface Random Interface
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* @ingroup io_interfaces
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* @{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <device.h>
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/**
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* @typedef random_get_entropy_t
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* @brief Callback API to get entropy.
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*
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* See random_get_entropy() for argument description
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*/
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typedef int (*random_get_entropy_t)(struct device *dev,
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uint8_t *buffer,
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uint16_t length);
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struct random_driver_api {
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random_get_entropy_t get_entropy;
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};
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/**
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* @brief Get entropy from the random driver.
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*
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* Fill a buffer with entropy from the random driver.
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*
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* @param dev Pointer to the random device.
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* @param buffer Buffer to fill with entropy.
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* @param length Buffer length.
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* @retval 0 on success.
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* @retval -ERRNO errno code on error.
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*/
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static inline int random_get_entropy(struct device *dev,
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uint8_t *buffer,
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uint16_t length)
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{
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const struct random_driver_api *api = dev->driver_api;
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__ASSERT(api->get_entropy, "Callback pointer should not be NULL");
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return api->get_entropy(dev, buffer, length);
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}
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#ifdef __cplusplus
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}
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#endif
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/**
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* @}
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*/
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#endif /* __RANDOM_H__ */
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