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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2007-07-19 06:45:45 +0400
committerLen Brown <len.brown@intel.com>2007-07-22 07:49:55 +0400
commita8fba3da3d11d808137be7ebeb3b6938a42f011f (patch)
treecaf34342b50fcd152625655e785d78c982151ad1 /drivers/misc
parentedf0e0e56904f794c97ca6c4562d8256e3d8d8e3 (diff)
downloadlinux-a8fba3da3d11d808137be7ebeb3b6938a42f011f.tar.xz
ACPI: thinkpad-acpi: make sure DSDT TMPx readings don't return +128
We get +128 instead of -128 from the DSDT TMPx methods, due to errors when converting a EC byte return that is a s8 to an ACPI handler return that is an int. Fix it once and for all, by clamping acceptable temperature readings from DSDT TMPx so that anything outside the [-127,+127] range is converted to TP_EC_THERMAL_TMP_NA (-128). Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Michael Olbrich <michael.olbrich@gmx.net> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/thinkpad_acpi.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 623d36fd8dbe..f74d7d600d83 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -2853,6 +2853,8 @@ static int thermal_get_sensor(int idx, s32 *value)
snprintf(tmpi, sizeof(tmpi), "TMP%c", '0' + idx);
if (!acpi_evalf(ec_handle, &t, tmpi, "d"))
return -EIO;
+ if (t > 127 || t < -127)
+ t = TP_EC_THERMAL_TMP_NA;
*value = t * 1000;
return 0;
}