tpm: rng: Add driver model interface for TPM RNG device
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>
diff --git a/lib/Kconfig b/lib/Kconfig
index 7dd777b..e888c29 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -360,6 +360,7 @@
config TPM
bool "Trusted Platform Module (TPM) Support"
depends on DM
+ imply DM_RNG
help
This enables support for TPMs which can be used to provide security
features for your board. The TPM can be connected via LPC or I2C
diff --git a/lib/tpm_api.c b/lib/tpm_api.c
index 4ac4612..032f383 100644
--- a/lib/tpm_api.c
+++ b/lib/tpm_api.c
@@ -269,7 +269,7 @@
if (tpm_is_v1(dev))
return tpm1_get_random(dev, data, count);
else if (tpm_is_v2(dev))
- return -ENOSYS; /* not implemented yet */
- else
- return -ENOSYS;
+ return tpm2_get_random(dev, data, count);
+
+ return -ENOSYS;
}