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>
#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;
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);