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ACPI: thinkpad-acpi: improve thinkpad detection

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Improve the detection of ThinkPads, so as to reduce the chances of false
positives.

Since this could potentially add false negatives on the very old models,
add a module parameter to force the detection of a thinkpad.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh
2007-04-21 11:08:34 -03:00
committed by Len Brown
parent a5763f2223
commit 0dcef77c5b
3 changed files with 21 additions and 0 deletions
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13
drivers/misc/thinkpad_acpi.c
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@@ -2881,6 +2881,16 @@ 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 = dmi_name_in_vendors("IBM");
if (!is_thinkpad && !force_load)
return -ENODEV;
return 0;
}
@@ -2986,6 +2996,9 @@ module_param(experimental, int, 0);
static u32 dbg_level;
module_param_named(debug, dbg_level, uint, 0);
static int force_load;
module_param(force_load, int, 0);
#define IBM_PARAM(feature) \
module_param_call(feature, set_ibm_param, NULL, NULL, 0)