[PATCH 0/6] tpm_tis: various cleanups, and support for Intel iTPM

[Andy Isaacson <adi@vmware.com>]

Several patches to improve drivers/char/tpm/tpm_tis.c:

 - autoload tpm_tis.ko based on acpi / pnp
 - fix driver/hardware bugs observed on iTPM
 - improve module probing printks
 - add workaround code for iTPM

With these patches, the T500's iTPM probes ok and has reasonable
contents in /sys/kernel/security/tpm0/ascii_bios_measurements:

% dmesg|grep tpm
[    8.599680] tpm_tis INTC0102:00: found 0xfed40000(0x5000)
[    8.599769] tpm_tis INTC0102:00: no IRQ found in _CRS, polling mode
[    8.608607] tpm_tis INTC0102:00: 1.2 TPM (8086:1020 rev 6)
[    8.608665] tpm_tis INTC0102:00: Intel iTPM workaround enabled
% sudo head -3 /sys/kernel/security/tpm0/ascii_bios_measurements
 0 d6184a2d2e3a8bfae13a1ebb37d62e222bfab57d 08 [S-CRTM Version]
 1 0f18524a0ed83806de3bab13c05e2dcc7a8e9c09 09 [CPU Microcode]
 0 d9f7d65755c884f6c25680d577f348523006eed3 01 [POST CODE]

Also, I've tested that the driver still works on Dell E4300.

I'm not sure that switching to ACPI probing is either necessary or a
good idea, but I wasn't able to get the pnp_driver system to load the
driver on the Lenovo.

 drivers/char/tpm/Kconfig   |    2 +-
 drivers/char/tpm/tpm_tis.c |  202 +++++++++++++++++------
 2 files changed, 150 insertions(+), 54 deletions(-)

-andy