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| author | Carsten Emde <C.Emde@osadl.org> | 2010-05-24 14:33:39 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-25 08:07:07 -0700 |
| commit | 5db47b009d17d69a2f8d84357e7b24c3e3c2edec (patch) | |
| tree | e2b4b84a7a24bc5eb02581bec4f4fa623d046406 /drivers/hwmon/coretemp.c | |
| parent | e0c70b80786296d4f3c35ebe0d52591cebf8f916 (diff) | |
| download | linux-rpi3-5db47b009d17d69a2f8d84357e7b24c3e3c2edec.tar.gz linux-rpi3-5db47b009d17d69a2f8d84357e7b24c3e3c2edec.tar.bz2 linux-rpi3-5db47b009d17d69a2f8d84357e7b24c3e3c2edec.zip | |
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>
Diffstat (limited to 'drivers/hwmon/coretemp.c')
| -rw-r--r-- | drivers/hwmon/coretemp.c | 32 |
1 files changed, 12 insertions, 20 deletions
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index e9b7fbc5a447..9fae7cbc5d76 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -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; |