Add clear command.

utility/tpmc.c

 /* 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 command utility.  Runs simple TPM commands.  Mostly useful when physical
  * presence has not been locked.
  */
 
 #include <stdio.h>
 #include <string.h>
@@ skipping 42 matching lines @@
   { "continueselftest", "ctest", "issue a ContinueSelfTest command",
     TlclContinueSelfTest },
   { "assertphysicalpresence", "ppon", "assert Physical Presence",
     TlclAssertPhysicalPresence },
   { "enable", "ena", "enable the TPM (needs PP)", TlclSetEnable },
   { "disable", "dis", "disable the TPM (needs PP)", TlclClearEnable },
   { "activate", "act", "activate the TPM (needs PP, maybe reboot)",
     HandlerActivate },
   { "deactivate", "deact", "deactivate the TPM (needs PP, maybe reboot)",
     HandlerDeactivate },
+  { "clear", "clr", "clear the TPM owner (needs PP)", TlclForceClear },
 };
 
 static int n_commands = sizeof(command_table) / sizeof(command_table[0]);
 
 int main(int argc, char* argv[]) {
   if (argc < 2) {
     fprintf(stderr, "usage: %s <TPM command>\n   or: %s help\n",
             argv[0], argv[0]);
     exit(1);
   } else {
@@ skipping 32 matching lines @@
           return 1;
         }
       }
     }
 
     /* No command matched. */
     fprintf(stderr, "%s: unknown command: %s\n", argv[0], cmd);
     return 1;
   }
 }