Add a command to enable the physical presence command.

firmware/lib/tpm_lite/tlcl.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.
  */
 
 /* A lightweight TPM command library.
  *
  * The general idea is that TPM commands are array of bytes whose
  * fields are mostly compile-time constant.  The goal is to build much
  * of the commands at compile time (or build time) and change some of
@@ skipping 158 matching lines @@
 uint32_t TlclReadLock(uint32_t index) {
   VBDEBUG(("TPM: Read lock 0x%x\n", index));
   return TlclRead(index, NULL, 0);
 }
 
 uint32_t TlclAssertPhysicalPresence(void) {
   VBDEBUG(("TPM: Asserting physical presence\n"));
   return Send(tpm_ppassert_cmd.buffer);
 }
 
+uint32_t TlclPhysicalPresenceCMDEnable(void) {
+  VBDEBUG(("TPM: Enable the physical presence command\n"));
+  return Send(tpm_ppenable_cmd.buffer);
+}
+
 uint32_t TlclAssertPhysicalPresenceResult(void) {
   uint8_t response[TPM_LARGE_ENOUGH_COMMAND_SIZE];
   return TlclSendReceive(tpm_ppassert_cmd.buffer, response, sizeof(response));
 }
 
 uint32_t TlclLockPhysicalPresence(void) {
   VBDEBUG(("TPM: Lock physical presence\n"));
   return Send(tpm_pplock_cmd.buffer);
 }
 
@@ skipping 73 matching lines @@
       *disable = pflags.disable;
     if (deactivated)
       *deactivated = pflags.deactivated;
     if (nvlocked)
       *nvlocked = pflags.nvLocked;
     VBDEBUG(("TPM: Got flags disable=%d, deactivated=%d, nvlocked=%d\n",
              pflags.disable, pflags.deactivated, pflags.nvLocked));
   }
   return result;
 }
-    
+
 uint32_t TlclSetGlobalLock(void) {
   uint32_t x;
   VBDEBUG(("TPM: Set global lock\n"));
   return TlclWrite(TPM_NV_INDEX0, (uint8_t*) &x, 0);
 }
 
 uint32_t TlclExtend(int pcr_num, uint8_t* in_digest, uint8_t* out_digest) {
   struct s_tpm_extend_cmd cmd;
   uint8_t response[kTpmResponseHeaderLength + kPcrDigestLength];
   uint32_t result;
@@ skipping 20 matching lines @@
   Memcpy(&cmd, &tpm_getpermissions_cmd, sizeof(cmd));
   ToTpmUint32(cmd.buffer + tpm_getpermissions_cmd.index, index);
   result = TlclSendReceive(cmd.buffer, response, sizeof(response));
   if (result != TPM_SUCCESS)
     return result;
 
   nvdata = response + kTpmResponseHeaderLength + sizeof(size);
   FromTpmUint32(nvdata + kNvDataPublicPermissionsOffset, permissions);
   return result;
 }