From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755573Ab0EGJqD (ORCPT ); Fri, 7 May 2010 05:46:03 -0400 Received: from mga06.intel.com ([134.134.136.21]:47966 "EHLO orsmga101.jf.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753096Ab0EGJqA (ORCPT ); Fri, 7 May 2010 05:46:00 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.52,347,1270450800"; d="scan'208";a="619683838" Date: Fri, 7 May 2010 17:54:59 +0800 From: Huaxu Wan To: linux-kernel@vger.kernel.org, lm-sensors@lm-sensors.org Cc: huaxu.wan@intel.com, khali@linux-fr.org Subject: [PATCH 1/2] hwmon: (coretemp) Detect the thermal sensors by CPUID Message-ID: <20100507095459.GA12190@owl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The thermal sensors of Intel(R) CPUs can be detected by CPUID instruction, indicated by CPUID.06H.EAX[0]. Signed-off-by: Huaxu Wan --- drivers/hwmon/coretemp.c | 24 +++++++----------------- 1 files changed, 7 insertions(+), 17 deletions(-) diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index e9b7fbc..237c68d 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -440,6 +440,7 @@ static int __init coretemp_init(void) { int i, err = -ENODEV; struct pdev_entry *p, *n; + u32 eax; /* quick check if we run Intel */ if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL) @@ -450,23 +451,12 @@ static int __init coretemp_init(void) goto exit; for_each_online_cpu(i) { - struct cpuinfo_x86 *c = &cpu_data(i); - - /* check if family 6, models 0xe (Pentium M DC), - 0xf (Core 2 DC 65nm), 0x16 (Core 2 SC 65nm), - 0x17 (Penryn 45nm), 0x1a (Nehalem), 0x1c (Atom), - 0x1e (Lynnfield) */ - if ((c->cpuid_level < 0) || (c->x86 != 0x6) || - !((c->x86_model == 0xe) || (c->x86_model == 0xf) || - (c->x86_model == 0x16) || (c->x86_model == 0x17) || - (c->x86_model == 0x1a) || (c->x86_model == 0x1c) || - (c->x86_model == 0x1e))) { - - /* supported CPU not found, but report the unknown - family 6 CPU */ - if ((c->x86 == 0x6) && (c->x86_model > 0xf)) - printk(KERN_WARNING DRVNAME ": Unknown CPU " - "model 0x%x\n", c->x86_model); + /* check if the CPU has thermal sensor */ + eax = cpuid_eax(0x06); + if (!(eax & 0x01)) { + struct cpuinfo_x86 *c = &cpu_data(i); + printk_once(KERN_WARNING DRVNAME ": CPU (model=0x%x)" + " has no thermal sensor!\n", c->x86_model); continue; } -- 1.6.3.3.363.g725cf7