Add device open/close.

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 37 matching lines @@
 }
 
 #define assert(expr) do { if (!(expr)) { \
       error("assert fail: %s at %s:%d\n", \
             #expr, __FILE__, __LINE__); }} while(0)
 
 /* Call this first.
  */
 void TlclLibInit(void);
 
+/* Close and open the device.  This is needed for running more complex commands
+ * at user level, such as TPM_TakeOwnership, since the TPM device can be opened
+ * only by one process at a time.
+ */
+void TlclCloseDevice(void);
+void TlclOpenDevice(void);
+
 /* 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.  The TPM error code is
@@ skipping 83 matching lines @@
 
 /* Performs a TPM_Extend.
  */
 uint32_t TlclExtend(int pcr_num, uint8_t* in_digest, uint8_t* out_digest);
 
 /* Gets the permission bits for the NVRAM space with |index|.
  */
 uint32_t TlclGetPermissions(uint32_t index, uint32_t* permissions);
 
 #endif  /* TPM_LITE_TLCL_H_ */