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// SPDX-License-Identifier: GPL-2.0
#include <common.h>
#include <driver.h>
#include <init.h>
#include <linux/hw_random.h>
#include <efi.h>
#include <efi/efi-device.h>
struct efi_rng_priv {
struct efi_rng_protocol *protocol;
struct hwrng hwrng;
};
static inline struct efi_rng_priv *to_efi_rng(struct hwrng *hwrng)
{
return container_of(hwrng, struct efi_rng_priv, hwrng);
}
static int efi_rng_read(struct hwrng *hwrng, void *data, size_t len, bool wait)
{
struct efi_rng_protocol *protocol = to_efi_rng(hwrng)->protocol;
efi_status_t efiret;
efiret = protocol->get_rng(protocol, NULL, len, data);
return -efi_errno(efiret) ?: len;
}
static int efi_rng_probe(struct efi_device *efidev)
{
struct efi_rng_priv *priv;
priv = xzalloc(sizeof(*priv));
BS->handle_protocol(efidev->handle, &efi_rng_protocol_guid,
(void **)&priv->protocol);
if (!priv->protocol)
return -ENODEV;
priv->hwrng.name = dev_name(&efidev->dev);
priv->hwrng.read = efi_rng_read;
return hwrng_register(&efidev->dev, &priv->hwrng);
}
static struct efi_driver efi_rng_driver = {
.driver = {
.name = "efi-rng",
},
.probe = efi_rng_probe,
.guid = EFI_RNG_PROTOCOL_GUID,
};
device_efi_driver(efi_rng_driver);
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