linux-kernel - [PATCH 1/2 V2] hwmon: (coretemp) Detect the thermal sensors by CPUID

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Date:	Mon, 10 May 2010 11:35:25 +0800
From:	Huaxu Wan <huaxu.wan@...ux.intel.com>
To:	Huaxu Wan <huaxu.wan@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	huaxu.wan@...el.com, Carsten Emde <Carsten.Emde@...dl.org>
Subject: [PATCH 1/2 V2] hwmon: (coretemp) Detect the thermal sensors by
 CPUID


The thermal sensors of Intel(R) CPUs can be detected by CPUID instruction,
indicated by CPUID.06H.EAX[0].

Signed-off-by: Huaxu Wan <huaxu.wan@...ux.intel.com>
Signed-off-by: Carsten Emde <C.Emde@...dl.org>
---
 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..d194207 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(KERN_WARNING DRVNAME ": CPU (model=0x%x)"
+ 				" has no thermal sensor!\n", c->x86_model);
 			continue;
 		}
 
-- 
1.6.3.3.363.g725cf7

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