| /* |
| * 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. |
| */ |
| |
| // 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). |
| |
| } |
| } |