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SubjectRe: [PATCH 5/6] tpm_tis: convert from pnp_driver to acpi_driver
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On Wed, 2009-07-01 at 11:01 +0100, Alan Cox wrote:
> On Tue, 30 Jun 2009 18:04:14 -0700
> Andy Isaacson <adi@vmware.com> wrote:
>
> > Not all TIS-compatible TPM chips have a _HID method in their ACPI entry,
> > and the TPM spec says that the _CID method should be used to enumerate
> > the TPM chip.
>
> There are a number of systems with TPMs (older laptops) that don't work
> very well if you enable ACPI.
>
> This is therefore a regression - NAK
>
> Probably the best thing to do is to provide both ACPI and PnP
> registration according to what is configured into the kernel. (And I
> guess spot duplicates although the resource should be busy anyway)
> --
David sent this earlier when I said that PNP didn't work with this chip:

<quote>
The problem here is acpi pnp but the fix is really simple. The current
pnpacpi/core.c routine that looks for isapnp devices enumerated in acpi
enforces that the acpi hid be a valid isapnp id (the formats are
slightly different). But that's broken: it shoudl be enforcing that
either the acpi hid or any acpi cids be valid isapnp ids. It's a
one-line change to do this, see patch 2.

commit 7a553b4e7439ad0733da7da8663d32aa4865aa9e
Author: David Smith <dds@google.com>
Date: Tue Apr 28 18:52:02 2009 +0900

Update ACPI PNP to support devices with EISA PNP CIDs but non-PNP HIDs

Signed-off-by: David Smith <dds@google.com>

diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
index 9496494..8bfddfb 100644
--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -159,8 +159,8 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
* driver should not be loaded.
*/
status = acpi_get_handle(device->handle, "_CRS", &temp);
- if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
- is_exclusive_device(device) || (!device->status.present))
+ if (ACPI_FAILURE(status) || is_exclusive_device(device) ||
+ (!device->status.present))
return 0;

dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
</quote>

If so, we can just base our DATA_EXPECT bypass on the EISA PNP CID:

>From 47516ff6b63b81d1e806148dc5e3052a001e45d0 Mon Sep 17 00:00:00 2001
From: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
Date: Wed, 1 Jul 2009 09:59:55 -0300
Subject: [PATCH] TPM: DATA_EXPECT bit check bypass

Since the iTPM doesn't set the DATA_EXPECT bit when it should, we bypass
this bit check in case we're running the code over this specific TPM.

Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
---
drivers/char/tpm/tpm.h | 1 +
drivers/char/tpm/tpm_tis.c | 11 ++++++++++-
2 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 8e00b4d..ed4ecf0 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -109,6 +109,7 @@ struct tpm_chip {

struct list_head list;
void (*release) (struct device *);
+ bool is_itpm;
};

#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index aec1931..74a60d7 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -27,6 +27,7 @@
#include "tpm.h"

#define TPM_HEADER_SIZE 10
+#define ITPM_ID "INTC0102"

enum tis_access {
TPM_ACCESS_VALID = 0x80,
@@ -293,7 +294,9 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
&chip->vendor.int_queue);
status = tpm_tis_status(chip);
- if ((status & TPM_STS_DATA_EXPECT) == 0) {
+ /* iTPM never sets the DATA_EXPECT bit */
+ if (((status & TPM_STS_DATA_EXPECT) == 0) &&
+ (!chip->is_itpm)) {
rc = -EIO;
goto out_err;
}
@@ -582,6 +585,12 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
tpm_get_timeouts(chip);
tpm_continue_selftest(chip);

+ for (i=0; i < 8; i++)
+ if (ITPM_ID[i] != to_pnp_dev(dev)->id->id[i])
+ break;
+ if (i == 8)
+ chip->is_itpm = 1;
+
return 0;
out_err:
if (chip->vendor.iobase)
--
1.6.3.1







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