tpm: allow TPM v1 and v2 to be compiled at the same time

While there is probably no reason to do so in a real life situation, it
will allow to compile test both stacks with the same sandbox defconfig.

As we cannot define two 'tpm' commands at the same time, the command for
TPM v1 is still called 'tpm' and the one for TPM v2 'tpm2'. While this
is the exact command name that must be written into eg. test files, any
user already using the TPM v2 stack can continue to do so by just writing
'tpm' because as long as TPM v1 support is not compiled, U-Boot prompt
will search for the closest command named after 'tpm'.

The command set can also be changed at runtime (not supported yet, but
ready to be), but as one can compile only either one stack or the other,
there is still one spot in the code where conditionals are used: to
retrieve the v1 or v2 command set.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
[trini: In sandbox_tpm2_fill_buf() use NULL not \0 to ensure NULL
terminated string due to LLVM warning]
Signed-off-by: Tom Rini <trini@konsulko.com>

4 files changed, 10 insertions, 9 deletions

diff --git a/drivers/tpm/Kconfig b/drivers/tpm/Kconfig
index da1ed8f..782a620 100644
--- a/drivers/tpm/Kconfig
+++ b/drivers/tpm/Kconfig
@@ -4,9 +4,6 @@
 
 menu "TPM support"
 
-comment "Please select only one TPM revision"
-	depends on TPM_V1 && TPM_V2
-
 config TPM_V1
 	bool "TPMv1.x support"
 	depends on TPM
@@ -15,7 +12,7 @@ config TPM_V1
 	  Major TPM versions are not compatible at all, choose either
 	  one or the other. This option enables TPMv1.x drivers/commands.
 
-if TPM_V1 && !TPM_V2
+if TPM_V1
 
 config TPM_TIS_SANDBOX
 	bool "Enable sandbox TPM driver"
@@ -127,7 +124,7 @@ config TPM_V2
 	  Major TPM versions are not compatible at all, choose either
 	  one or the other. This option enables TPMv2.x drivers/commands.
 
-if TPM_V2 && !TPM_V1
+if TPM_V2
 
 config TPM2_TIS_SANDBOX
 	bool "Enable sandbox TPMv2.x driver"
diff --git a/drivers/tpm/tpm-uclass.c b/drivers/tpm/tpm-uclass.c
index 412697e..c83f53a 100644
--- a/drivers/tpm/tpm-uclass.c
+++ b/drivers/tpm/tpm-uclass.c
@@ -7,11 +7,8 @@
 #include <common.h>
 #include <dm.h>
 #include <linux/unaligned/be_byteshift.h>
-#if defined(CONFIG_TPM_V1)
 #include <tpm-v1.h>
-#elif defined(CONFIG_TPM_V2)
 #include <tpm-v2.h>
-#endif
 #include "tpm_internal.h"
 
 int tpm_open(struct udevice *dev)
diff --git a/drivers/tpm/tpm2_tis_sandbox.c b/drivers/tpm/tpm2_tis_sandbox.c
index 3240cc5..66f6c9b 100644
--- a/drivers/tpm/tpm2_tis_sandbox.c
+++ b/drivers/tpm/tpm2_tis_sandbox.c
@@ -232,7 +232,7 @@ static int sandbox_tpm2_fill_buf(u8 **recv, size_t *recv_len, u16 tag, u32 rc)
 	*recv += sizeof(rc);
 
 	/* Add trailing \0 */
-	*recv = '\0';
+	*recv = NULL;
 
 	return 0;
 }
@@ -590,6 +590,9 @@ static int sandbox_tpm2_probe(struct udevice *dev)
 	struct sandbox_tpm2 *tpm = dev_get_priv(dev);
 	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 
+	/* Use the TPM v2 stack */
+	priv->version = TPM_V2;
+
 	memset(tpm, 0, sizeof(*tpm));
 
 	priv->pcr_count = 32;
diff --git a/drivers/tpm/tpm2_tis_spi.c b/drivers/tpm/tpm2_tis_spi.c
index c5d17a6..8878130 100644
--- a/drivers/tpm/tpm2_tis_spi.c
+++ b/drivers/tpm/tpm2_tis_spi.c
@@ -510,6 +510,7 @@ static int tpm_tis_spi_cleanup(struct udevice *dev)
 static int tpm_tis_spi_open(struct udevice *dev)
 {
 	struct tpm_chip *chip = dev_get_priv(dev);
+	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
 
 	if (chip->is_open)
 		return -EBUSY;
@@ -575,6 +576,9 @@ static int tpm_tis_spi_probe(struct udevice *dev)
 	struct tpm_chip *chip = dev_get_priv(dev);
 	int ret;
 
+	/* Use the TPM v2 stack */
+	priv->version = TPM_V2;
+
 	if (IS_ENABLED(CONFIG_DM_GPIO)) {
 		struct gpio_desc reset_gpio;