Make all TPM command functions return TPM_SUCCESS or the TPM error code.

src/tlcl/tlcl.h

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* TPM Lightweight Command Library.
  *
  * A low-level library for interfacing to TPM hardware or an emulator.
  */
 
@@ skipping 46 matching lines @@
 
 /* Logs to stdout.  Arguments like printf.
  */
 void TlclLog(char* format, ...);
 
 /* Sets the log level.  0 is quietest.
  */
 void TlclSetLogLevel(int level);
 
 /* Sends a TPM_Startup(ST_CLEAR).  Note that this is a no-op for the emulator,
- * because it runs this command during initialization.
+ * because it runs this command during initialization.  The TPM error code is
+ * returned (0 for success).
  */
-void TlclStartup(void);
+uint32_t TlclStartup(void);
 
 /* Run the self test.  Note---this is synchronous.  To run this in parallel
- * with other firmware, use ContinueSelfTest.
+ * with other firmware, use ContinueSelfTest.  The TPM error code is returned.
  */
-void TlclSelftestfull(void);
+uint32_t TlclSelftestfull(void);
 
 /* Defines a space with permission [perm].  [index] is the index for the space,
- * [size] the usable data size.  Errors are ignored.
+ * [size] the usable data size.  The TPM error code is returned.
  */
-void TlclDefineSpace(uint32_t index, uint32_t perm, uint32_t size);
+uint32_t TlclDefineSpace(uint32_t index, uint32_t perm, uint32_t size);
 
 /* Writes [length] bytes of [data] to space at [index].  The TPM error code is
- * returned (0 for success).
+ * returned.
  */
 uint32_t TlclWrite(uint32_t index, uint8_t *data, uint32_t length);
 
 /* Reads [length] bytes from space at [index] into [data].  The TPM error code
- * is returned (0 for success).
+ * is returned.
  */
 uint32_t TlclRead(uint32_t index, uint8_t *data, uint32_t length);
 
-/* Write-locks space at [index].
+/* Write-locks space at [index].  The TPM error code is returned.
  */
-void TlclWriteLock(uint32_t index);
+uint32_t TlclWriteLock(uint32_t index);
 
-/* Read-locks space at [index].
+/* Read-locks space at [index].  The TPM error code is returned.
  */
-void TlclReadLock(uint32_t index);
+uint32_t TlclReadLock(uint32_t index);
 
-/* Asserts physical presence in software.
+/* Asserts physical presence in software.  The TPM error code is returned.
  */
-void TlclAssertPhysicalPresence(void);
+uint32_t TlclAssertPhysicalPresence(void);
 
-/* Turns off physical presence and locks it off until next reboot.
+/* Turns off physical presence and locks it off until next reboot.  The TPM
+ * error code is returned.
  */
 uint32_t TlclLockPhysicalPresence(void);
 
-/* Sets the nvLocked bit.
+/* Sets the nvLocked bit.  The TPM error code is returned.
  */
-void TlclSetNvLocked(void);
+uint32_t TlclSetNvLocked(void);
 
 /* Returns 1 if the TPM is owned, 0 otherwise.
  */
 int TlclIsOwned(void);
 
-/* Issues a ForceClear.
+/* Issues a ForceClear.  The TPM error code is returned.
  */
-void TlclForceClear(void);
+uint32_t TlclForceClear(void);
 
-/* Issues a SetEnable.
+/* Issues a SetEnable.  The TPM error code is returned.
  */
-void TlclSetEnable(void);
+uint32_t TlclSetEnable(void);
 
 /* Issues a SetDeactivated.  Pass 0 to activate.  Returns result code.
  */
-int TlclSetDeactivated(uint8_t flag);
+uint32_t TlclSetDeactivated(uint8_t flag);
 
-/* Gets flags of interest.  (Add more here as needed.)
+/* Gets flags of interest.  (Add more here as needed.)  The TPM error code is
+ * returned.
  */
-int TlclGetFlags(uint8_t* disable, uint8_t* deactivated);
+uint32_t TlclGetFlags(uint8_t* disable, uint8_t* deactivated);
 
-/* Sets the bGlobalLock flag, which only a reboot can clear.
+/* Sets the bGlobalLock flag, which only a reboot can clear.  The TPM error
+ * code is returned.
  */
 uint32_t TlclSetGlobalLock(void);
 
 #endif  /* TPM_LITE_TLCL_H_ */