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firmware: smccc: Register smccc_trng platform device

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At the moment we probe for the Random Number Generator SMCCC service,
and use that in the core code (arch_get_random). However the hardware
entropy can also be useful to access from userland, and be it to assess
its quality.

Register a platform device when the SMCCC TRNG service is detected, to
allow a hw_random driver to hook onto this.

The function registering the device is deliberately made in a way which
allows expansion, so other services that could be exposed via a platform
device (or some other interface), can be added here easily.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Andre Przywara 2021-07-31 21:48:44 +01:00 committed by Herbert Xu
parent 5441a07a12
commit b83c2d92be
1 changed files with 17 additions and 0 deletions
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17
drivers/firmware/smccc/smccc.c
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@ -9,6 +9,7 @@
#include <linux/init.h>
#include <linux/arm-smccc.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <asm/archrandom.h>
static u32 smccc_version = ARM_SMCCC_VERSION_1_0;
@ -42,3 +43,19 @@ u32 arm_smccc_get_version(void)
return smccc_version;
}
EXPORT_SYMBOL_GPL(arm_smccc_get_version);
static int __init smccc_devices_init(void)
{
struct platform_device *pdev;
if (smccc_trng_available) {
pdev = platform_device_register_simple("smccc_trng", -1,
NULL, 0);
if (IS_ERR(pdev))
pr_err("smccc_trng: could not register device: %ld\n",
PTR_ERR(pdev));
}
return 0;
}
device_initcall(smccc_devices_init);