Initial version.

2023-12-20 00:11:03 +08:00
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+/***************************************************************************//**
+ *   @file   trng.c
+ *   @brief  Implementation of the TRNG Interface
+ *   @author Antoniu Miclaus ([email protected])
+********************************************************************************
+ * Copyright 2023(c) Analog Devices, Inc.
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *  - Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  - Neither the name of Analog Devices, Inc. nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *  - The use of this software may or may not infringe the patent rights
+ *    of one or more patent holders.  This license does not release you
+ *    from the requirement that you obtain separate licenses from these
+ *    patent holders to use this software.
+ *  - Use of the software either in source or binary form, must be run
+ *    on or directly connected to an Analog Devices Inc. component.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*******************************************************************************/
+
+/******************************************************************************/
+/***************************** Include Files **********************************/
+/******************************************************************************/
+#include <inttypes.h>
+#include "trng.h"
+#include <stdlib.h>
+#include "error.h"
+
+/******************************************************************************/
+/************************ Functions Definitions *******************************/
+/******************************************************************************/
+
+/**
+ * @brief Initialize the TRNG.
+ * @param desc - The TRNG descriptor.
+ * @param param - The structure that contains the TRNG parameters.
+ * @return 0 in case of success, -1 otherwise.
+ */
+int trng_init(struct trng_desc **desc,
+		    const struct trng_init_param *param)
+{
+	int ret;
+
+	if (!param || !param->platform_ops)
+		return -EINVAL;
+
+	if (!param->platform_ops->init)
+		return -ENOSYS;
+
+	ret = param->platform_ops->init(desc, param);
+	if (ret)
+		return ret;
+
+	(*desc)->platform_ops = param->platform_ops;
+
+	return 0;
+}
+
+/**
+ * @brief Free the resources allocated by trng_init().
+ * @param desc - The TRNG descriptor.
+ * @return 0 in case of success, -1 otherwise.
+ */
+int trng_remove(struct trng_desc *desc)
+{
+	if (!desc || !desc->platform_ops)
+		return -EINVAL;
+
+	if (!desc->platform_ops->remove)
+		return -ENOSYS;
+
+	return desc->platform_ops->remove(desc);
+}
+
+/**
+ * @brief Fill buffer with rng data.
+ * @param desc - The TRNG descriptor.
+ * @param buff - Buffer to be filled
+ * @param len - Size of the buffer
+ * @return 0 in case of success, -1 otherwise.
+ */
+int trng_fill_buffer(struct trng_desc *desc, uint8_t *buff,
+			   uint32_t len)
+{
+	if (!desc || !desc->platform_ops)
+		return -EINVAL;
+
+	if (!desc->platform_ops->fill_buffer)
+		return -ENOSYS;
+
+	return desc->platform_ops->fill_buffer(desc, buff, len);
+}