Messages in this thread Patches in this message | | | Subject | Re: [PATCH 5/6] tpm_tis: convert from pnp_driver to acpi_driver | From | Rajiv Andrade <> | Date | Wed, 01 Jul 2009 10:45:19 -0300 |
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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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