ACPI: thinkpad-acpi: make sure DSDT TMPx readings don't return +128
authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Thu, 19 Jul 2007 02:45:45 +0000 (23:45 -0300)
committerLen Brown <len.brown@intel.com>
Sun, 22 Jul 2007 03:49:55 +0000 (23:49 -0400)
commita8fba3da3d11d808137be7ebeb3b6938a42f011f
treecaf34342b50fcd152625655e785d78c982151ad1
parentedf0e0e56904f794c97ca6c4562d8256e3d8d8e3
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>
drivers/misc/thinkpad_acpi.c