The series of patches add PPI support in linux kernel. The Physical Presence Interface enables the OS and the BIOS to cooperate to provide a simple and straightforward platform user experience for administering the TPM without sacrificing security. PATCH 1: drivers: Add PPI support in tpm driver PATCH 2: Documentation: sysfs for physical presence interface ��.n��������+%������w��{.n�����{����*jg��������ݢj����G�������j:+v���w�m������w�������h�����٥