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The TPM device has a builtin random number generator(RNG) functionality. Expose the RNG functions of the TPM device to the driver model so that they can be used by the EFI_RNG_PROTOCOL if the protocol is installed. Also change the function arguments and return type of the random number functions to comply with the driver model api. Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
23 lines
459 B
C
23 lines
459 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2022, Linaro Limited
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*/
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#include <dm.h>
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#include <rng.h>
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#include <tpm_api.h>
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static int rng_tpm_random_read(struct udevice *dev, void *data, size_t count)
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{
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return tpm_get_random(dev_get_parent(dev), data, count);
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}
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static const struct dm_rng_ops tpm_rng_ops = {
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.read = rng_tpm_random_read,
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};
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U_BOOT_DRIVER(tpm_rng) = {
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.name = "tpm-rng",
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.id = UCLASS_RNG,
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.ops = &tpm_rng_ops,
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};
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