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drivers/hwmon/coretemp.c: 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@linux.intel.com>
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Reviewed-by: Valdis Kletnieks <valdis.kletnieks@vt.edu>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Yong Wang <yong.y.wang@linux.intel.com>
Cc: Rudolf Marek <r.marek@assembler.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Carsten Emde 2010-05-24 14:33:39 -07:00 committed by Linus Torvalds
parent e0c70b8078
commit 5db47b009d
1 changed files with 12 additions and 20 deletions
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32
drivers/hwmon/coretemp.c
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@ -451,28 +451,20 @@ static int __init coretemp_init(void)
for_each_online_cpu(i) {
struct cpuinfo_x86 *c = &cpu_data(i);
/*
* CPUID.06H.EAX[0] indicates whether the CPU has thermal
* sensors. We check this bit only, all the early CPUs
* without thermal sensors will be filtered out.
*/
if (c->cpuid_level >= 6 && (cpuid_eax(0x06) & 0x01)) {
err = coretemp_device_add(i);
if (err)
goto exit_devices_unreg;
/* 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);
continue;
} else {
printk(KERN_INFO DRVNAME ": CPU (model=0x%x)"
" has no thermal sensor.\n", c->x86_model);
}
err = coretemp_device_add(i);
if (err)
goto exit_devices_unreg;
}
if (list_empty(&pdev_list)) {
err = -ENODEV;