tpm: add tpm_auto_startup() into tpm-interface.c

Add wrapper tpm_auto_startup() to tpm-interface.c
instead of open coded decision between TPM 1.x and TPM 2.x
in tpm-chip.c

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

drivers/char/tpm/tpm-chip.c

@@ -451,14 +451,9 @@ int tpm_chip_register(struct tpm_chip *chip)
 {
 	int rc;
 
-	if (chip->ops->flags & TPM_OPS_AUTO_STARTUP) {
-		if (chip->flags & TPM_CHIP_FLAG_TPM2)
-			rc = tpm2_auto_startup(chip);
-		else
-			rc = tpm1_auto_startup(chip);
-		if (rc)
-			return rc;
-	}
+	rc = tpm_auto_startup(chip);
+	if (rc)
+		return rc;
 
 	tpm_sysfs_add_device(chip);
 

drivers/char/tpm/tpm-interface.c

@@ -544,6 +544,21 @@ int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
 }
 EXPORT_SYMBOL_GPL(tpm_send);
 
+int tpm_auto_startup(struct tpm_chip *chip)
+{
+	int rc;
+
+	if (!(chip->ops->flags & TPM_OPS_AUTO_STARTUP))
+		return 0;
+
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		rc = tpm2_auto_startup(chip);
+	else
+		rc = tpm1_auto_startup(chip);
+
+	return rc;
+}
+
 /*
  * We are about to suspend. Save the TPM state
  * so that it can be restored.

drivers/char/tpm/tpm.h

@@ -541,6 +541,7 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
 			 size_t min_rsp_body_length, unsigned int flags,
 			 const char *desc);
 int tpm_get_timeouts(struct tpm_chip *);
+int tpm_auto_startup(struct tpm_chip *chip);
 
 int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr);
 int tpm1_auto_startup(struct tpm_chip *chip);