2 * coretemp.c - Linux kernel module for hardware monitoring
4 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
6 * Inspired from many hwmon drivers
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/jiffies.h>
29 #include <linux/hwmon.h>
30 #include <linux/sysfs.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
34 #include <linux/list.h>
35 #include <linux/platform_device.h>
36 #include <linux/cpu.h>
37 #include <linux/smp.h>
38 #include <linux/moduleparam.h>
40 #include <asm/processor.h>
41 #include <asm/cpu_device_id.h>
43 #define DRVNAME "coretemp"
46 * force_tjmax only matters when TjMax can't be read from the CPU itself.
47 * When set, it replaces the driver's suboptimal heuristic.
49 static int force_tjmax
;
50 module_param_named(tjmax
, force_tjmax
, int, 0444);
51 MODULE_PARM_DESC(tjmax
, "TjMax value in degrees Celsius");
53 #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
54 #define NUM_REAL_CORES 32 /* Number of Real cores per cpu */
55 #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
56 #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
57 #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
58 #define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
60 #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
61 #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
62 #define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO)
65 #define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu))
67 #define for_each_sibling(i, cpu) for (i = 0; false; )
71 * Per-Core Temperature Data
72 * @last_updated: The time when the current temperature value was updated
73 * earlier (in jiffies).
74 * @cpu_core_id: The CPU Core from which temperature values should be read
75 * This value is passed as "id" field to rdmsr/wrmsr functions.
76 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
77 * from where the temperature values should be read.
78 * @attr_size: Total number of pre-core attrs displayed in the sysfs.
79 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
80 * Otherwise, temp_data holds coretemp data.
81 * @valid: If this is 1, the current temperature is valid.
87 unsigned long last_updated
;
94 struct sensor_device_attribute sd_attrs
[TOTAL_ATTRS
];
95 char attr_name
[TOTAL_ATTRS
][CORETEMP_NAME_LENGTH
];
96 struct mutex update_lock
;
99 /* Platform Data per Physical CPU */
100 struct platform_data
{
101 struct device
*hwmon_dev
;
103 struct temp_data
*core_data
[MAX_CORE_DATA
];
104 struct device_attribute name_attr
;
108 struct list_head list
;
109 struct platform_device
*pdev
;
113 static LIST_HEAD(pdev_list
);
114 static DEFINE_MUTEX(pdev_list_mutex
);
116 static ssize_t
show_name(struct device
*dev
,
117 struct device_attribute
*devattr
, char *buf
)
119 return sprintf(buf
, "%s\n", DRVNAME
);
122 static ssize_t
show_label(struct device
*dev
,
123 struct device_attribute
*devattr
, char *buf
)
125 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
126 struct platform_data
*pdata
= dev_get_drvdata(dev
);
127 struct temp_data
*tdata
= pdata
->core_data
[attr
->index
];
129 if (tdata
->is_pkg_data
)
130 return sprintf(buf
, "Physical id %u\n", pdata
->phys_proc_id
);
132 return sprintf(buf
, "Core %u\n", tdata
->cpu_core_id
);
135 static ssize_t
show_crit_alarm(struct device
*dev
,
136 struct device_attribute
*devattr
, char *buf
)
139 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
140 struct platform_data
*pdata
= dev_get_drvdata(dev
);
141 struct temp_data
*tdata
= pdata
->core_data
[attr
->index
];
143 rdmsr_on_cpu(tdata
->cpu
, tdata
->status_reg
, &eax
, &edx
);
145 return sprintf(buf
, "%d\n", (eax
>> 5) & 1);
148 static ssize_t
show_tjmax(struct device
*dev
,
149 struct device_attribute
*devattr
, char *buf
)
151 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
152 struct platform_data
*pdata
= dev_get_drvdata(dev
);
154 return sprintf(buf
, "%d\n", pdata
->core_data
[attr
->index
]->tjmax
);
157 static ssize_t
show_ttarget(struct device
*dev
,
158 struct device_attribute
*devattr
, char *buf
)
160 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
161 struct platform_data
*pdata
= dev_get_drvdata(dev
);
163 return sprintf(buf
, "%d\n", pdata
->core_data
[attr
->index
]->ttarget
);
166 static ssize_t
show_temp(struct device
*dev
,
167 struct device_attribute
*devattr
, char *buf
)
170 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
171 struct platform_data
*pdata
= dev_get_drvdata(dev
);
172 struct temp_data
*tdata
= pdata
->core_data
[attr
->index
];
174 mutex_lock(&tdata
->update_lock
);
176 /* Check whether the time interval has elapsed */
177 if (!tdata
->valid
|| time_after(jiffies
, tdata
->last_updated
+ HZ
)) {
178 rdmsr_on_cpu(tdata
->cpu
, tdata
->status_reg
, &eax
, &edx
);
180 /* Check whether the data is valid */
181 if (eax
& 0x80000000) {
182 tdata
->temp
= tdata
->tjmax
-
183 ((eax
>> 16) & 0x7f) * 1000;
186 tdata
->last_updated
= jiffies
;
189 mutex_unlock(&tdata
->update_lock
);
190 return tdata
->valid
? sprintf(buf
, "%d\n", tdata
->temp
) : -EAGAIN
;
198 static const struct tjmax __cpuinitconst tjmax_table
[] = {
199 { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
200 { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
201 { "CPU CE4110", 110000 }, /* Model 0x1c, stepping 10 Sodaville */
202 { "CPU CE4150", 110000 }, /* Model 0x1c, stepping 10 */
203 { "CPU CE4170", 110000 }, /* Model 0x1c, stepping 10 */
214 static const struct tjmax_model __cpuinitconst tjmax_model_table
[] = {
215 { 0x1c, 10, 100000 }, /* D4xx, K4xx, N4xx, D5xx, K5xx, N5xx */
216 { 0x1c, ANY
, 90000 }, /* Z5xx, N2xx, possibly others
217 * Note: Also matches 230 and 330,
218 * which are covered by tjmax_table
220 { 0x26, ANY
, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx)
221 * Note: TjMax for E6xxT is 110C, but CPU type
222 * is undetectable by software
224 { 0x27, ANY
, 90000 }, /* Atom Medfield (Z2460) */
225 { 0x35, ANY
, 90000 }, /* Atom Clover Trail/Cloverview (Z2760) */
226 { 0x36, ANY
, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx) */
229 static int __cpuinit
adjust_tjmax(struct cpuinfo_x86
*c
, u32 id
,
232 /* The 100C is default for both mobile and non mobile CPUs */
235 int tjmax_ee
= 85000;
241 /* explicit tjmax table entries override heuristics */
242 for (i
= 0; i
< ARRAY_SIZE(tjmax_table
); i
++) {
243 if (strstr(c
->x86_model_id
, tjmax_table
[i
].id
))
244 return tjmax_table
[i
].tjmax
;
247 for (i
= 0; i
< ARRAY_SIZE(tjmax_model_table
); i
++) {
248 const struct tjmax_model
*tm
= &tjmax_model_table
[i
];
249 if (c
->x86_model
== tm
->model
&&
250 (tm
->mask
== ANY
|| c
->x86_mask
== tm
->mask
))
254 /* Early chips have no MSR for TjMax */
256 if (c
->x86_model
== 0xf && c
->x86_mask
< 4)
259 if (c
->x86_model
> 0xe && usemsr_ee
) {
263 * Now we can detect the mobile CPU using Intel provided table
264 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
265 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
267 err
= rdmsr_safe_on_cpu(id
, 0x17, &eax
, &edx
);
270 "Unable to access MSR 0x17, assuming desktop"
273 } else if (c
->x86_model
< 0x17 && !(eax
& 0x10000000)) {
275 * Trust bit 28 up to Penryn, I could not find any
276 * documentation on that; if you happen to know
277 * someone at Intel please ask
281 /* Platform ID bits 52:50 (EDX starts at bit 32) */
282 platform_id
= (edx
>> 18) & 0x7;
285 * Mobile Penryn CPU seems to be platform ID 7 or 5
288 if (c
->x86_model
== 0x17 &&
289 (platform_id
== 5 || platform_id
== 7)) {
291 * If MSR EE bit is set, set it to 90 degrees C,
292 * otherwise 105 degrees C
301 err
= rdmsr_safe_on_cpu(id
, 0xee, &eax
, &edx
);
304 "Unable to access MSR 0xEE, for Tjmax, left"
306 } else if (eax
& 0x40000000) {
309 } else if (tjmax
== 100000) {
311 * If we don't use msr EE it means we are desktop CPU
312 * (with exeception of Atom)
314 dev_warn(dev
, "Using relative temperature scale!\n");
320 static int __cpuinit
get_tjmax(struct cpuinfo_x86
*c
, u32 id
,
328 * A new feature of current Intel(R) processors, the
329 * IA32_TEMPERATURE_TARGET contains the TjMax value
331 err
= rdmsr_safe_on_cpu(id
, MSR_IA32_TEMPERATURE_TARGET
, &eax
, &edx
);
333 if (c
->x86_model
> 0xe && c
->x86_model
!= 0x1c)
334 dev_warn(dev
, "Unable to read TjMax from CPU %u\n", id
);
336 val
= (eax
>> 16) & 0xff;
338 * If the TjMax is not plausible, an assumption
342 dev_dbg(dev
, "TjMax is %d degrees C\n", val
);
348 dev_notice(dev
, "TjMax forced to %d degrees C by user\n",
350 return force_tjmax
* 1000;
354 * An assumption is made for early CPUs and unreadable MSR.
355 * NOTE: the calculated value may not be correct.
357 return adjust_tjmax(c
, id
, dev
);
360 static int create_name_attr(struct platform_data
*pdata
,
363 sysfs_attr_init(&pdata
->name_attr
.attr
);
364 pdata
->name_attr
.attr
.name
= "name";
365 pdata
->name_attr
.attr
.mode
= S_IRUGO
;
366 pdata
->name_attr
.show
= show_name
;
367 return device_create_file(dev
, &pdata
->name_attr
);
370 static int __cpuinit
create_core_attrs(struct temp_data
*tdata
,
371 struct device
*dev
, int attr_no
)
374 static ssize_t (*const rd_ptr
[TOTAL_ATTRS
]) (struct device
*dev
,
375 struct device_attribute
*devattr
, char *buf
) = {
376 show_label
, show_crit_alarm
, show_temp
, show_tjmax
,
378 static const char *const names
[TOTAL_ATTRS
] = {
379 "temp%d_label", "temp%d_crit_alarm",
380 "temp%d_input", "temp%d_crit",
383 for (i
= 0; i
< tdata
->attr_size
; i
++) {
384 snprintf(tdata
->attr_name
[i
], CORETEMP_NAME_LENGTH
, names
[i
],
386 sysfs_attr_init(&tdata
->sd_attrs
[i
].dev_attr
.attr
);
387 tdata
->sd_attrs
[i
].dev_attr
.attr
.name
= tdata
->attr_name
[i
];
388 tdata
->sd_attrs
[i
].dev_attr
.attr
.mode
= S_IRUGO
;
389 tdata
->sd_attrs
[i
].dev_attr
.show
= rd_ptr
[i
];
390 tdata
->sd_attrs
[i
].index
= attr_no
;
391 err
= device_create_file(dev
, &tdata
->sd_attrs
[i
].dev_attr
);
399 device_remove_file(dev
, &tdata
->sd_attrs
[i
].dev_attr
);
404 static int __cpuinit
chk_ucode_version(unsigned int cpu
)
406 struct cpuinfo_x86
*c
= &cpu_data(cpu
);
409 * Check if we have problem with errata AE18 of Core processors:
410 * Readings might stop update when processor visited too deep sleep,
411 * fixed for stepping D0 (6EC).
413 if (c
->x86_model
== 0xe && c
->x86_mask
< 0xc && c
->microcode
< 0x39) {
414 pr_err("Errata AE18 not fixed, update BIOS or "
415 "microcode of the CPU!\n");
421 static struct platform_device __cpuinit
*coretemp_get_pdev(unsigned int cpu
)
423 u16 phys_proc_id
= TO_PHYS_ID(cpu
);
424 struct pdev_entry
*p
;
426 mutex_lock(&pdev_list_mutex
);
428 list_for_each_entry(p
, &pdev_list
, list
)
429 if (p
->phys_proc_id
== phys_proc_id
) {
430 mutex_unlock(&pdev_list_mutex
);
434 mutex_unlock(&pdev_list_mutex
);
438 static struct temp_data __cpuinit
*init_temp_data(unsigned int cpu
,
441 struct temp_data
*tdata
;
443 tdata
= kzalloc(sizeof(struct temp_data
), GFP_KERNEL
);
447 tdata
->status_reg
= pkg_flag
? MSR_IA32_PACKAGE_THERM_STATUS
:
448 MSR_IA32_THERM_STATUS
;
449 tdata
->is_pkg_data
= pkg_flag
;
451 tdata
->cpu_core_id
= TO_CORE_ID(cpu
);
452 tdata
->attr_size
= MAX_CORE_ATTRS
;
453 mutex_init(&tdata
->update_lock
);
457 static int __cpuinit
create_core_data(struct platform_device
*pdev
,
458 unsigned int cpu
, int pkg_flag
)
460 struct temp_data
*tdata
;
461 struct platform_data
*pdata
= platform_get_drvdata(pdev
);
462 struct cpuinfo_x86
*c
= &cpu_data(cpu
);
467 * Find attr number for sysfs:
468 * We map the attr number to core id of the CPU
469 * The attr number is always core id + 2
470 * The Pkgtemp will always show up as temp1_*, if available
472 attr_no
= pkg_flag
? 1 : TO_ATTR_NO(cpu
);
474 if (attr_no
> MAX_CORE_DATA
- 1)
478 * Provide a single set of attributes for all HT siblings of a core
479 * to avoid duplicate sensors (the processor ID and core ID of all
480 * HT siblings of a core are the same).
481 * Skip if a HT sibling of this core is already registered.
482 * This is not an error.
484 if (pdata
->core_data
[attr_no
] != NULL
)
487 tdata
= init_temp_data(cpu
, pkg_flag
);
491 /* Test if we can access the status register */
492 err
= rdmsr_safe_on_cpu(cpu
, tdata
->status_reg
, &eax
, &edx
);
496 /* We can access status register. Get Critical Temperature */
497 tdata
->tjmax
= get_tjmax(c
, cpu
, &pdev
->dev
);
500 * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET.
501 * The target temperature is available on older CPUs but not in this
502 * register. Atoms don't have the register at all.
504 if (c
->x86_model
> 0xe && c
->x86_model
!= 0x1c) {
505 err
= rdmsr_safe_on_cpu(cpu
, MSR_IA32_TEMPERATURE_TARGET
,
509 = tdata
->tjmax
- ((eax
>> 8) & 0xff) * 1000;
514 pdata
->core_data
[attr_no
] = tdata
;
516 /* Create sysfs interfaces */
517 err
= create_core_attrs(tdata
, &pdev
->dev
, attr_no
);
523 pdata
->core_data
[attr_no
] = NULL
;
528 static void __cpuinit
coretemp_add_core(unsigned int cpu
, int pkg_flag
)
530 struct platform_device
*pdev
= coretemp_get_pdev(cpu
);
536 err
= create_core_data(pdev
, cpu
, pkg_flag
);
538 dev_err(&pdev
->dev
, "Adding Core %u failed\n", cpu
);
541 static void coretemp_remove_core(struct platform_data
*pdata
,
542 struct device
*dev
, int indx
)
545 struct temp_data
*tdata
= pdata
->core_data
[indx
];
547 /* Remove the sysfs attributes */
548 for (i
= 0; i
< tdata
->attr_size
; i
++)
549 device_remove_file(dev
, &tdata
->sd_attrs
[i
].dev_attr
);
551 kfree(pdata
->core_data
[indx
]);
552 pdata
->core_data
[indx
] = NULL
;
555 static int coretemp_probe(struct platform_device
*pdev
)
557 struct platform_data
*pdata
;
560 /* Initialize the per-package data structures */
561 pdata
= kzalloc(sizeof(struct platform_data
), GFP_KERNEL
);
565 err
= create_name_attr(pdata
, &pdev
->dev
);
569 pdata
->phys_proc_id
= pdev
->id
;
570 platform_set_drvdata(pdev
, pdata
);
572 pdata
->hwmon_dev
= hwmon_device_register(&pdev
->dev
);
573 if (IS_ERR(pdata
->hwmon_dev
)) {
574 err
= PTR_ERR(pdata
->hwmon_dev
);
575 dev_err(&pdev
->dev
, "Class registration failed (%d)\n", err
);
581 device_remove_file(&pdev
->dev
, &pdata
->name_attr
);
582 platform_set_drvdata(pdev
, NULL
);
588 static int coretemp_remove(struct platform_device
*pdev
)
590 struct platform_data
*pdata
= platform_get_drvdata(pdev
);
593 for (i
= MAX_CORE_DATA
- 1; i
>= 0; --i
)
594 if (pdata
->core_data
[i
])
595 coretemp_remove_core(pdata
, &pdev
->dev
, i
);
597 device_remove_file(&pdev
->dev
, &pdata
->name_attr
);
598 hwmon_device_unregister(pdata
->hwmon_dev
);
599 platform_set_drvdata(pdev
, NULL
);
604 static struct platform_driver coretemp_driver
= {
606 .owner
= THIS_MODULE
,
609 .probe
= coretemp_probe
,
610 .remove
= coretemp_remove
,
613 static int __cpuinit
coretemp_device_add(unsigned int cpu
)
616 struct platform_device
*pdev
;
617 struct pdev_entry
*pdev_entry
;
619 mutex_lock(&pdev_list_mutex
);
621 pdev
= platform_device_alloc(DRVNAME
, TO_PHYS_ID(cpu
));
624 pr_err("Device allocation failed\n");
628 pdev_entry
= kzalloc(sizeof(struct pdev_entry
), GFP_KERNEL
);
631 goto exit_device_put
;
634 err
= platform_device_add(pdev
);
636 pr_err("Device addition failed (%d)\n", err
);
637 goto exit_device_free
;
640 pdev_entry
->pdev
= pdev
;
641 pdev_entry
->phys_proc_id
= pdev
->id
;
643 list_add_tail(&pdev_entry
->list
, &pdev_list
);
644 mutex_unlock(&pdev_list_mutex
);
651 platform_device_put(pdev
);
653 mutex_unlock(&pdev_list_mutex
);
657 static void __cpuinit
coretemp_device_remove(unsigned int cpu
)
659 struct pdev_entry
*p
, *n
;
660 u16 phys_proc_id
= TO_PHYS_ID(cpu
);
662 mutex_lock(&pdev_list_mutex
);
663 list_for_each_entry_safe(p
, n
, &pdev_list
, list
) {
664 if (p
->phys_proc_id
!= phys_proc_id
)
666 platform_device_unregister(p
->pdev
);
670 mutex_unlock(&pdev_list_mutex
);
673 static bool __cpuinit
is_any_core_online(struct platform_data
*pdata
)
677 /* Find online cores, except pkgtemp data */
678 for (i
= MAX_CORE_DATA
- 1; i
>= 0; --i
) {
679 if (pdata
->core_data
[i
] &&
680 !pdata
->core_data
[i
]->is_pkg_data
) {
687 static void __cpuinit
get_core_online(unsigned int cpu
)
689 struct cpuinfo_x86
*c
= &cpu_data(cpu
);
690 struct platform_device
*pdev
= coretemp_get_pdev(cpu
);
694 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
695 * sensors. We check this bit only, all the early CPUs
696 * without thermal sensors will be filtered out.
698 if (!cpu_has(c
, X86_FEATURE_DTHERM
))
702 /* Check the microcode version of the CPU */
703 if (chk_ucode_version(cpu
))
707 * Alright, we have DTS support.
708 * We are bringing the _first_ core in this pkg
709 * online. So, initialize per-pkg data structures and
710 * then bring this core online.
712 err
= coretemp_device_add(cpu
);
716 * Check whether pkgtemp support is available.
717 * If so, add interfaces for pkgtemp.
719 if (cpu_has(c
, X86_FEATURE_PTS
))
720 coretemp_add_core(cpu
, 1);
723 * Physical CPU device already exists.
724 * So, just add interfaces for this core.
726 coretemp_add_core(cpu
, 0);
729 static void __cpuinit
put_core_offline(unsigned int cpu
)
732 struct platform_data
*pdata
;
733 struct platform_device
*pdev
= coretemp_get_pdev(cpu
);
735 /* If the physical CPU device does not exist, just return */
739 pdata
= platform_get_drvdata(pdev
);
741 indx
= TO_ATTR_NO(cpu
);
743 /* The core id is too big, just return */
744 if (indx
> MAX_CORE_DATA
- 1)
747 if (pdata
->core_data
[indx
] && pdata
->core_data
[indx
]->cpu
== cpu
)
748 coretemp_remove_core(pdata
, &pdev
->dev
, indx
);
751 * If a HT sibling of a core is taken offline, but another HT sibling
752 * of the same core is still online, register the alternate sibling.
753 * This ensures that exactly one set of attributes is provided as long
754 * as at least one HT sibling of a core is online.
756 for_each_sibling(i
, cpu
) {
760 * Display temperature sensor data for one HT sibling
761 * per core only, so abort the loop after one such
762 * sibling has been found.
768 * If all cores in this pkg are offline, remove the device.
769 * coretemp_device_remove calls unregister_platform_device,
770 * which in turn calls coretemp_remove. This removes the
771 * pkgtemp entry and does other clean ups.
773 if (!is_any_core_online(pdata
))
774 coretemp_device_remove(cpu
);
777 static int __cpuinit
coretemp_cpu_callback(struct notifier_block
*nfb
,
778 unsigned long action
, void *hcpu
)
780 unsigned int cpu
= (unsigned long) hcpu
;
784 case CPU_DOWN_FAILED
:
785 get_core_online(cpu
);
787 case CPU_DOWN_PREPARE
:
788 put_core_offline(cpu
);
794 static struct notifier_block coretemp_cpu_notifier __refdata
= {
795 .notifier_call
= coretemp_cpu_callback
,
798 static const struct x86_cpu_id __initconst coretemp_ids
[] = {
799 { X86_VENDOR_INTEL
, X86_FAMILY_ANY
, X86_MODEL_ANY
, X86_FEATURE_DTHERM
},
802 MODULE_DEVICE_TABLE(x86cpu
, coretemp_ids
);
804 static int __init
coretemp_init(void)
809 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
810 * sensors. We check this bit only, all the early CPUs
811 * without thermal sensors will be filtered out.
813 if (!x86_match_cpu(coretemp_ids
))
816 err
= platform_driver_register(&coretemp_driver
);
821 for_each_online_cpu(i
)
824 #ifndef CONFIG_HOTPLUG_CPU
825 if (list_empty(&pdev_list
)) {
828 goto exit_driver_unreg
;
832 register_hotcpu_notifier(&coretemp_cpu_notifier
);
836 #ifndef CONFIG_HOTPLUG_CPU
838 platform_driver_unregister(&coretemp_driver
);
844 static void __exit
coretemp_exit(void)
846 struct pdev_entry
*p
, *n
;
849 unregister_hotcpu_notifier(&coretemp_cpu_notifier
);
850 mutex_lock(&pdev_list_mutex
);
851 list_for_each_entry_safe(p
, n
, &pdev_list
, list
) {
852 platform_device_unregister(p
->pdev
);
856 mutex_unlock(&pdev_list_mutex
);
858 platform_driver_unregister(&coretemp_driver
);
861 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
862 MODULE_DESCRIPTION("Intel Core temperature monitor");
863 MODULE_LICENSE("GPL");
865 module_init(coretemp_init
)
866 module_exit(coretemp_exit
)