Now that we can have multiple .c files in the tpm module there is
no reason for tpm-bios.

tpm-bios exported several functions: tpm_bios_log_setup,
tpm_bios_log_teardown, tpm_add_ppi, and tpm_remove_ppi.

They are only used by tpm, and if tpm-bios is built then
tpm will unconditionally require them. Further, tpm-bios does
nothing on its own, it has no module_init function.

Thus we remove the exports and merge the modules to simplify things.

The Makefile conditions are changed slightly to match the code,
tpm_ppi is always required if CONFIG_ACPI is set.
Signed-off-by: NJason Gunthorpe <jgunthorpe@obsidianresearch.com>

 Ensure that the 'version' string includes a NULL terminator after its
copied out of the acpi table.
Signed-off-by: NChen Gang <gang.chen@asianux.com>
Signed-off-by: NKent Yoder <key@linux.vnet.ibm.com>

This patch try to fix the S3 regression https://lkml.org/lkml/2012/10/5/433,
which includes below line:
[ 1554.684638] sysfs: cannot create duplicate filename '/devices/pnp0/00:0c/ppi'

The root cause is that ppi sysfs teardown code is MIA, so while S3 resume,
the ppi kobject will be created again upon existing one.

To make the tear down code simple, change the ppi subfolder creation from
using kobject_create_and_add to just using a named ppi attribute_group. Then
ppi sysfs teardown could be done with a simple sysfs_remove_group call.

Adjusted the name & return type for ppi sysfs init function.
Reported-by: NBen Guthro <ben@guthro.net>
Signed-off-by: NGang Wei <gang.wei@intel.com>
Signed-off-by: NKent Yoder <key@linux.vnet.ibm.com>

This patch declares the internal struct and functions as static to provide
more security.
Signed-off-by: NXiaoyan Zhang <xiaoyan.zhang@intel.com>
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Reviewed-by: NKent Yoder <key@linux.vnet.ibm.com>
Signed-off-by: NJames Morris <james.l.morris@oracle.com>

The Physical Presence Interface enables the OS and the BIOS to cooperate and
provides a simple and straightforward platform user experience for
administering the TPM without sacrificing security.

V2: separate the patch out in a separate source file,
    add #ifdef CONFIG_ACPI so it compiles out on ppc,
    use standard error instead of ACPI error as return code of show/store fns.
V3: move #ifdef CONFIG_ACPI from .c file to .h file.
V4: move tpm_ppi code from tpm module to tpm_bios module.
V5: modify sys_add_ppi() so that ppi_attr_grp doesn't need to be exported
Signed-off-by: NXiaoyan Zhang <xiaoyan.zhang@intel.com>
Signed-off-by: NKent Yoder <key@linux.vnet.ibm.com>