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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 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.
*/
// Thermal Zone
Scope (\_TZ)
{
ThermalZone (THRM)
{
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 (TCHK, 0, Serialized)
{
// Get Temperature from TIN# set in NVS
Store (\_SB.PCI0.LPCB.EC0.TINS (TMPS), Local0)
// Check for sensor not calibrated
If (LEqual (Local0, \_SB.PCI0.LPCB.EC0.TNCA)) {
Return (CTOK(0))
}
// Check for sensor not present
If (LEqual (Local0, \_SB.PCI0.LPCB.EC0.TNPR)) {
Return (CTOK(0))
}
// Check for sensor not powered
If (LEqual (Local0, \_SB.PCI0.LPCB.EC0.TNOP)) {
Return (CTOK(0))
}
// Check for sensor bad reading
If (LEqual (Local0, \_SB.PCI0.LPCB.EC0.TBAD)) {
Return (CTOK(0))
}
// Adjust by offset to get Kelvin
Add (\_SB.PCI0.LPCB.EC0.TOFS, Local0, Local0)
// Convert to 1/10 Kelvin
Multiply (Local0, 10, Local0)
Return (Local0)
}
Method (_TMP, 0, Serialized)
{
// Get temperature from EC in deci-kelvin
Store (TCHK (), 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 (TCHK (), Local0)
Store ("RE-READ TEMPERATURE", Debug)
Store (Local0, Debug)
}
Return (Local0)
}
}
}
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