From e675abafcc0df38125e6e94a9ba91c92fe774f52 Mon Sep 17 00:00:00 2001 From: Henrique de Moraes Holschuh Date: Sat, 12 Sep 2009 15:22:13 -0300 Subject: [PATCH] thinkpad-acpi: be more strict when detecting a ThinkPad Use stricter checks to decide that we're running on a supported ThinkPad. This should remove some possible false positives, although nobody ever bothered to report any. Signed-off-by: Henrique de Moraes Holschuh Signed-off-by: Len Brown --- drivers/platform/x86/thinkpad_acpi.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index cc4155c3620..d69ab3f0bdb 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -1621,6 +1621,9 @@ static void tpacpi_remove_driver_attributes(struct device_driver *drv) * * Sources: IBM ThinkPad Public Web Documents (update changelogs), * Information from users in ThinkWiki + * + * WARNING: we use this table also to detect that the machine is + * a ThinkPad in some cases, so don't remove entries lightly. */ #define TPV_Q(__v, __id1, __id2, __bv1, __bv2) \ @@ -1782,6 +1785,12 @@ static void __init tpacpi_check_outdated_fw(void) } } +static bool __init tpacpi_is_fw_known(void) +{ + return tpacpi_check_quirks(tpacpi_bios_version_qtable, + ARRAY_SIZE(tpacpi_bios_version_qtable)) != 0; +} + /**************************************************************************** **************************************************************************** * @@ -7706,9 +7715,11 @@ static int __init probe_for_thinkpad(void) /* * Non-ancient models have better DMI tagging, but very old models - * don't. + * don't. tpacpi_is_fw_known() is a cheat to help in that case. */ - is_thinkpad = (thinkpad_id.model_str != NULL); + is_thinkpad = (thinkpad_id.model_str != NULL) || + (thinkpad_id.ec_model != 0) || + tpacpi_is_fw_known(); /* ec is required because many other handles are relative to it */ TPACPI_ACPIHANDLE_INIT(ec); @@ -7719,13 +7730,6 @@ static int __init probe_for_thinkpad(void) return -ENODEV; } - /* - * Risks a regression on very old machines, but reduces potential - * false positives a damn great deal - */ - if (!is_thinkpad) - is_thinkpad = (thinkpad_id.vendor == PCI_VENDOR_ID_IBM); - if (!is_thinkpad && !force_load) return -ENODEV; -- 2.11.4.GIT