tpm: xen-tpmfront: Remove the locality sysfs attribute

Upon deeper review it was agreed to remove the driver-unique
'locality' sysfs attribute before it is present in a released
kernel.

The attribute was introduced in e2683957fb268c6b29316fd9e7191e13239a30a5
during the 3.12 merge window, so this patch needs to go in before
3.12 is released.

The hope is to have a well defined locality API that all the other
locality aware drivers can use, perhaps in 3.13.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Store devname in the tpm_chip

Just put the memory directly in the chip structure, rather than
in a 2nd dedicated kmalloc.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Use container_of to locate the tpm_chip in tpm_open

misc_open sets the file->private_date to the misc_dev when calling
open. We can use container_of to go from the misc_dev back to the
tpm_chip.

Future clean ups will move tpm_open into a new file and this change
means we do not have to export the tpm_chip list.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Remove redundant dev_set_drvdata

TPM drivers should not call dev_set_drvdata (or aliases), only the core
code is allowed to call dev_set_drvdata, and it does it during
tpm_register_hardware.

These extra sets are harmless, but are an anti-pattern that many drivers
have copied.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Remove tpm_show_caps_1_2

The version of the TPM should not depend on the bus it is connected
through. 1.1, 1.2 and soon 2.0 TPMS will be all be able to use the
same bus interfaces.

Make tpm_show_caps try the 1.2 capability first. If that fails then
fall back to the 1.1 capability. This effectively auto-detects what
interface the TPM supports at run-time.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Pull everything related to /dev/tpmX into tpm-dev.c

CLASS-dev.c is a common idiom for Linux subsystems

This pulls all the code related to the miscdev into tpm-dev.c and makes it
static. The identical file_operation structs in the drivers are purged and the
tpm common code unconditionally creates the miscdev.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Pull everything related to sysfs into tpm-sysfs.c

CLASS-sysfs.c is a common idiom for linux subsystems.

This pulls all the sysfs attribute functions and related code
into tpm-sysfs.c. To support this change some constants are moved
from tpm.c to tpm.h and __tpm_pcr_read is made non-static and is
called tpm_pcr_read_dev.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Create a tpm_class_ops structure and use it in the drivers

This replaces the static initialization of a tpm_vendor_specific
structure in the drivers with the standard Linux idiom of providing
a const structure of function pointers.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Use the ops structure instead of a copy in tpm_vendor_specific

This builds on the last commit to use the ops structure in the core
and reduce the size of tpm_vendor_specific.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: st33: Remove chip->data_buffer access from this driver

For some reason this driver thinks that chip->data_buffer needs
to be set before it can call tpm_pm_*. This is not true. data_buffer
is used only by /dev/tpmX, which is why it is managed exclusively
by the fops functions.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
tpm: Make tpm-dev allocate a per-file structure

This consolidates everything that is only used within tpm-dev.c
into tpm-dev.c and out of the publicly visible struct tpm_chip.

The per-file allocation lays the ground work for someday fixing the
strange forced O_EXCL behaviour of the current code.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>