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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <variant/thermal.h>
/* Thermal Zone */
Scope (\_TZ)
{
ThermalZone (THRM)
{
/* Thermal constants for passive cooling */
Name (_TC1, 0x02)
Name (_TC2, 0x05)
/* Thermal zone polling frequency: 10 seconds */
Name (_TZP, 100)
/* Thermal sampling period for passive cooling: 2 seconds */
Name (_TSP, 20)
/* Convert from Degrees C to 1/10 Kelvin for ACPI */
Method (CTOK, 1) {
/* 10th of Degrees C */
Multiply (Arg0, 10, Local0)
/* Convert to Kelvin */
Add (Local0, 2732, Local0)
Return (Local0)
}
/* Threshold for OS to shutdown */
Method (_CRT, 0, Serialized)
{
Return (CTOK (\TCRT))
}
/* Threshold for passive cooling */
Method (_PSV, 0, Serialized)
{
Return (CTOK (\TPSV))
}
/* Processors used for passive cooling */
Method (_PSL, 0, Serialized)
{
Return (\PPKG ())
}
Method (_TMP, 0, Serialized)
{
/* Get temperature from EC in deci-kelvin */
Store (\_SB.PCI0.LPCB.EC0.TSRD (TMPS), Local0)
/* Critical temperature in deci-kelvin */
Store (CTOK (\TCRT), Local1)
If (LGreaterEqual (Local0, Local1)) {
Store ("CRITICAL TEMPERATURE", Debug)
Store (Local0, Debug)
/* Wait 1 second for EC to re-poll */
Sleep (1000)
/* Re-read temperature from EC */
Store (\_SB.PCI0.LPCB.EC0.TSRD (TMPS), Local0)
Store ("RE-READ TEMPERATURE", Debug)
Store (Local0, Debug)
}
Return (Local0)
}
/* No active fan control (_ACx) on Kahlee */
}
}