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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
// Thermal Zone
Scope (\_TZ)
{
ThermalZone (THRM)
{
Name (_TC1, 0x02)
Name (_TC2, 0x05)
// Ignore critical temps for the first few reads
// at boot to prevent unexpected shutdown
Name (IRDC, 4)
Name (CRDC, 0)
// 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 CPU Temperature from the Embedded Controller
Store (\_SB.PCI0.LPCB.EC0.CTMP, Local0)
// Re-read from EC if the temperature is very high to
// avoid OS shutdown if we got a bad reading.
If (LGreaterEqual (Local0, \TCRT)) {
Store (\_SB.PCI0.LPCB.EC0.CTMP, Local0)
If (LGreaterEqual (Local0, \TCRT)) {
// Check if this is an early read
If (LLess (CRDC, IRDC)) {
Store (0, Local0)
}
}
}
// Keep track of first few reads by the OS
If (LLess (CRDC, IRDC)) {
Increment (CRDC)
}
Return (CTOK (Local0))
}
// The EC does all fan control. The is no Active Cooling Fan control (_ACx).
}
}
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