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/pci.h>
38 #include <linux/smp.h>
40 #include <asm/processor.h>
42 #define DRVNAME "coretemp"
44 #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
45 #define NUM_REAL_CORES 16 /* Number of Real cores per cpu */
46 #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
47 #define MAX_ATTRS 5 /* Maximum no of per-core attrs */
48 #define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
51 #define TO_PHYS_ID(cpu) cpu_data(cpu).phys_proc_id
52 #define TO_CORE_ID(cpu) cpu_data(cpu).cpu_core_id
53 #define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO)
54 #define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu))
56 #define TO_PHYS_ID(cpu) (cpu)
57 #define TO_CORE_ID(cpu) (cpu)
58 #define TO_ATTR_NO(cpu) (cpu)
59 #define for_each_sibling(i, cpu) for (i = 0; false; )
63 * Per-Core Temperature Data
64 * @last_updated: The time when the current temperature value was updated
65 * earlier (in jiffies).
66 * @cpu_core_id: The CPU Core from which temperature values should be read
67 * This value is passed as "id" field to rdmsr/wrmsr functions.
68 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
69 * from where the temperature values should be read.
70 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
71 * Otherwise, temp_data holds coretemp data.
72 * @valid: If this is 1, the current temperature is valid.
78 unsigned long last_updated
;
84 struct sensor_device_attribute sd_attrs
[MAX_ATTRS
];
85 char attr_name
[MAX_ATTRS
][CORETEMP_NAME_LENGTH
];
86 struct mutex update_lock
;
89 /* Platform Data per Physical CPU */
90 struct platform_data
{
91 struct device
*hwmon_dev
;
93 struct temp_data
*core_data
[MAX_CORE_DATA
];
94 struct device_attribute name_attr
;
98 struct list_head list
;
99 struct platform_device
*pdev
;
105 static LIST_HEAD(pdev_list
);
106 static DEFINE_MUTEX(pdev_list_mutex
);
108 static ssize_t
show_name(struct device
*dev
,
109 struct device_attribute
*devattr
, char *buf
)
111 return sprintf(buf
, "%s\n", DRVNAME
);
114 static ssize_t
show_label(struct device
*dev
,
115 struct device_attribute
*devattr
, char *buf
)
117 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
118 struct platform_data
*pdata
= dev_get_drvdata(dev
);
119 struct temp_data
*tdata
= pdata
->core_data
[attr
->index
];
121 if (tdata
->is_pkg_data
)
122 return sprintf(buf
, "Physical id %u\n", pdata
->phys_proc_id
);
124 return sprintf(buf
, "Core %u\n", tdata
->cpu_core_id
);
127 static ssize_t
show_crit_alarm(struct device
*dev
,
128 struct device_attribute
*devattr
, char *buf
)
131 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
132 struct platform_data
*pdata
= dev_get_drvdata(dev
);
133 struct temp_data
*tdata
= pdata
->core_data
[attr
->index
];
135 rdmsr_on_cpu(tdata
->cpu
, tdata
->status_reg
, &eax
, &edx
);
137 return sprintf(buf
, "%d\n", (eax
>> 5) & 1);
140 static ssize_t
show_tjmax(struct device
*dev
,
141 struct device_attribute
*devattr
, char *buf
)
143 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
144 struct platform_data
*pdata
= dev_get_drvdata(dev
);
146 return sprintf(buf
, "%d\n", pdata
->core_data
[attr
->index
]->tjmax
);
149 static ssize_t
show_ttarget(struct device
*dev
,
150 struct device_attribute
*devattr
, char *buf
)
152 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
153 struct platform_data
*pdata
= dev_get_drvdata(dev
);
155 return sprintf(buf
, "%d\n", pdata
->core_data
[attr
->index
]->ttarget
);
158 static ssize_t
show_temp(struct device
*dev
,
159 struct device_attribute
*devattr
, char *buf
)
162 struct sensor_device_attribute
*attr
= to_sensor_dev_attr(devattr
);
163 struct platform_data
*pdata
= dev_get_drvdata(dev
);
164 struct temp_data
*tdata
= pdata
->core_data
[attr
->index
];
166 mutex_lock(&tdata
->update_lock
);
168 /* Check whether the time interval has elapsed */
169 if (!tdata
->valid
|| time_after(jiffies
, tdata
->last_updated
+ HZ
)) {
170 rdmsr_on_cpu(tdata
->cpu
, tdata
->status_reg
, &eax
, &edx
);
172 /* Check whether the data is valid */
173 if (eax
& 0x80000000) {
174 tdata
->temp
= tdata
->tjmax
-
175 ((eax
>> 16) & 0x7f) * 1000;
178 tdata
->last_updated
= jiffies
;
181 mutex_unlock(&tdata
->update_lock
);
182 return tdata
->valid
? sprintf(buf
, "%d\n", tdata
->temp
) : -EAGAIN
;
185 static int adjust_tjmax(struct cpuinfo_x86
*c
, u32 id
, struct device
*dev
)
187 /* The 100C is default for both mobile and non mobile CPUs */
190 int tjmax_ee
= 85000;
194 struct pci_dev
*host_bridge
;
196 /* Early chips have no MSR for TjMax */
198 if (c
->x86_model
== 0xf && c
->x86_mask
< 4)
203 if (c
->x86_model
== 0x1c) {
206 host_bridge
= pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
208 if (host_bridge
&& host_bridge
->vendor
== PCI_VENDOR_ID_INTEL
209 && (host_bridge
->device
== 0xa000 /* NM10 based nettop */
210 || host_bridge
->device
== 0xa010)) /* NM10 based netbook */
215 pci_dev_put(host_bridge
);
218 if (c
->x86_model
> 0xe && usemsr_ee
) {
222 * Now we can detect the mobile CPU using Intel provided table
223 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
224 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
226 err
= rdmsr_safe_on_cpu(id
, 0x17, &eax
, &edx
);
229 "Unable to access MSR 0x17, assuming desktop"
232 } else if (c
->x86_model
< 0x17 && !(eax
& 0x10000000)) {
234 * Trust bit 28 up to Penryn, I could not find any
235 * documentation on that; if you happen to know
236 * someone at Intel please ask
240 /* Platform ID bits 52:50 (EDX starts at bit 32) */
241 platform_id
= (edx
>> 18) & 0x7;
244 * Mobile Penryn CPU seems to be platform ID 7 or 5
247 if (c
->x86_model
== 0x17 &&
248 (platform_id
== 5 || platform_id
== 7)) {
250 * If MSR EE bit is set, set it to 90 degrees C,
251 * otherwise 105 degrees C
260 err
= rdmsr_safe_on_cpu(id
, 0xee, &eax
, &edx
);
263 "Unable to access MSR 0xEE, for Tjmax, left"
265 } else if (eax
& 0x40000000) {
268 } else if (tjmax
== 100000) {
270 * If we don't use msr EE it means we are desktop CPU
271 * (with exeception of Atom)
273 dev_warn(dev
, "Using relative temperature scale!\n");
279 static int get_tjmax(struct cpuinfo_x86
*c
, u32 id
, struct device
*dev
)
281 /* The 100C is default for both mobile and non mobile CPUs */
287 * A new feature of current Intel(R) processors, the
288 * IA32_TEMPERATURE_TARGET contains the TjMax value
290 err
= rdmsr_safe_on_cpu(id
, MSR_IA32_TEMPERATURE_TARGET
, &eax
, &edx
);
292 dev_warn(dev
, "Unable to read TjMax from CPU.\n");
294 val
= (eax
>> 16) & 0xff;
296 * If the TjMax is not plausible, an assumption
299 if (val
> 80 && val
< 120) {
300 dev_info(dev
, "TjMax is %d C.\n", val
);
306 * An assumption is made for early CPUs and unreadable MSR.
307 * NOTE: the given value may not be correct.
310 switch (c
->x86_model
) {
315 dev_warn(dev
, "TjMax is assumed as 100 C!\n");
318 case 0x1c: /* Atom CPUs */
319 return adjust_tjmax(c
, id
, dev
);
321 dev_warn(dev
, "CPU (model=0x%x) is not supported yet,"
322 " using default TjMax of 100C.\n", c
->x86_model
);
327 static void __devinit
get_ucode_rev_on_cpu(void *edx
)
331 wrmsr(MSR_IA32_UCODE_REV
, 0, 0);
333 rdmsr(MSR_IA32_UCODE_REV
, eax
, *(u32
*)edx
);
336 static int get_pkg_tjmax(unsigned int cpu
, struct device
*dev
)
341 err
= rdmsr_safe_on_cpu(cpu
, MSR_IA32_TEMPERATURE_TARGET
, &eax
, &edx
);
343 val
= (eax
>> 16) & 0xff;
344 if (val
> 80 && val
< 120)
347 dev_warn(dev
, "Unable to read Pkg-TjMax from CPU:%u\n", cpu
);
348 return 100000; /* Default TjMax: 100 degree celsius */
351 static int create_name_attr(struct platform_data
*pdata
, struct device
*dev
)
353 sysfs_attr_init(&pdata
->name_attr
.attr
);
354 pdata
->name_attr
.attr
.name
= "name";
355 pdata
->name_attr
.attr
.mode
= S_IRUGO
;
356 pdata
->name_attr
.show
= show_name
;
357 return device_create_file(dev
, &pdata
->name_attr
);
360 static int create_core_attrs(struct temp_data
*tdata
, struct device
*dev
,
364 static ssize_t (*rd_ptr
[MAX_ATTRS
]) (struct device
*dev
,
365 struct device_attribute
*devattr
, char *buf
) = {
366 show_label
, show_crit_alarm
, show_ttarget
,
367 show_temp
, show_tjmax
};
368 static const char *names
[MAX_ATTRS
] = {
369 "temp%d_label", "temp%d_crit_alarm",
370 "temp%d_max", "temp%d_input",
373 for (i
= 0; i
< MAX_ATTRS
; i
++) {
374 snprintf(tdata
->attr_name
[i
], CORETEMP_NAME_LENGTH
, names
[i
],
376 sysfs_attr_init(&tdata
->sd_attrs
[i
].dev_attr
.attr
);
377 tdata
->sd_attrs
[i
].dev_attr
.attr
.name
= tdata
->attr_name
[i
];
378 tdata
->sd_attrs
[i
].dev_attr
.attr
.mode
= S_IRUGO
;
379 tdata
->sd_attrs
[i
].dev_attr
.show
= rd_ptr
[i
];
380 tdata
->sd_attrs
[i
].dev_attr
.store
= NULL
;
381 tdata
->sd_attrs
[i
].index
= attr_no
;
382 err
= device_create_file(dev
, &tdata
->sd_attrs
[i
].dev_attr
);
390 device_remove_file(dev
, &tdata
->sd_attrs
[i
].dev_attr
);
394 static void update_ttarget(__u8 cpu_model
, struct temp_data
*tdata
,
401 * Initialize ttarget value. Eventually this will be
402 * initialized with the value from MSR_IA32_THERM_INTERRUPT
403 * register. If IA32_TEMPERATURE_TARGET is supported, this
404 * value will be over written below.
405 * To Do: Patch to initialize ttarget from MSR_IA32_THERM_INTERRUPT
407 tdata
->ttarget
= tdata
->tjmax
- 20000;
410 * Read the still undocumented IA32_TEMPERATURE_TARGET. It exists
411 * on older CPUs but not in this register,
412 * Atoms don't have it either.
414 if (cpu_model
> 0xe && cpu_model
!= 0x1c) {
415 err
= rdmsr_safe_on_cpu(tdata
->cpu
,
416 MSR_IA32_TEMPERATURE_TARGET
, &eax
, &edx
);
419 "Unable to read IA32_TEMPERATURE_TARGET MSR\n");
421 tdata
->ttarget
= tdata
->tjmax
-
422 ((eax
>> 8) & 0xff) * 1000;
427 static int __devinit
chk_ucode_version(struct platform_device
*pdev
)
429 struct cpuinfo_x86
*c
= &cpu_data(pdev
->id
);
434 * Check if we have problem with errata AE18 of Core processors:
435 * Readings might stop update when processor visited too deep sleep,
436 * fixed for stepping D0 (6EC).
438 if (c
->x86_model
== 0xe && c
->x86_mask
< 0xc) {
439 /* check for microcode update */
440 err
= smp_call_function_single(pdev
->id
, get_ucode_rev_on_cpu
,
444 "Cannot determine microcode revision of "
445 "CPU#%u (%d)!\n", pdev
->id
, err
);
447 } else if (edx
< 0x39) {
449 "Errata AE18 not fixed, update BIOS or "
450 "microcode of the CPU!\n");
457 static struct platform_device
*coretemp_get_pdev(unsigned int cpu
)
459 u16 phys_proc_id
= TO_PHYS_ID(cpu
);
460 struct pdev_entry
*p
;
462 mutex_lock(&pdev_list_mutex
);
464 list_for_each_entry(p
, &pdev_list
, list
)
465 if (p
->phys_proc_id
== phys_proc_id
) {
466 mutex_unlock(&pdev_list_mutex
);
470 mutex_unlock(&pdev_list_mutex
);
474 static struct temp_data
*init_temp_data(unsigned int cpu
, int pkg_flag
)
476 struct temp_data
*tdata
;
478 tdata
= kzalloc(sizeof(struct temp_data
), GFP_KERNEL
);
482 tdata
->status_reg
= pkg_flag
? MSR_IA32_PACKAGE_THERM_STATUS
:
483 MSR_IA32_THERM_STATUS
;
484 tdata
->is_pkg_data
= pkg_flag
;
486 tdata
->cpu_core_id
= TO_CORE_ID(cpu
);
487 mutex_init(&tdata
->update_lock
);
491 static int create_core_data(struct platform_data
*pdata
,
492 struct platform_device
*pdev
,
493 unsigned int cpu
, int pkg_flag
)
495 struct temp_data
*tdata
;
496 struct cpuinfo_x86
*c
= &cpu_data(cpu
);
501 * Find attr number for sysfs:
502 * We map the attr number to core id of the CPU
503 * The attr number is always core id + 2
504 * The Pkgtemp will always show up as temp1_*, if available
506 attr_no
= pkg_flag
? 1 : TO_ATTR_NO(cpu
);
508 if (attr_no
> MAX_CORE_DATA
- 1)
512 * Provide a single set of attributes for all HT siblings of a core
513 * to avoid duplicate sensors (the processor ID and core ID of all
514 * HT siblings of a core are the same).
515 * Skip if a HT sibling of this core is already registered.
516 * This is not an error.
518 if (pdata
->core_data
[attr_no
] != NULL
)
521 tdata
= init_temp_data(cpu
, pkg_flag
);
525 /* Test if we can access the status register */
526 err
= rdmsr_safe_on_cpu(cpu
, tdata
->status_reg
, &eax
, &edx
);
530 /* We can access status register. Get Critical Temperature */
532 tdata
->tjmax
= get_pkg_tjmax(pdev
->id
, &pdev
->dev
);
534 tdata
->tjmax
= get_tjmax(c
, cpu
, &pdev
->dev
);
536 update_ttarget(c
->x86_model
, tdata
, &pdev
->dev
);
537 pdata
->core_data
[attr_no
] = tdata
;
539 /* Create sysfs interfaces */
540 err
= create_core_attrs(tdata
, &pdev
->dev
, attr_no
);
550 static void coretemp_add_core(unsigned int cpu
, int pkg_flag
)
552 struct platform_data
*pdata
;
553 struct platform_device
*pdev
= coretemp_get_pdev(cpu
);
559 pdata
= platform_get_drvdata(pdev
);
561 err
= create_core_data(pdata
, pdev
, cpu
, pkg_flag
);
563 dev_err(&pdev
->dev
, "Adding Core %u failed\n", cpu
);
566 static void coretemp_remove_core(struct platform_data
*pdata
,
567 struct device
*dev
, int indx
)
570 struct temp_data
*tdata
= pdata
->core_data
[indx
];
572 /* Remove the sysfs attributes */
573 for (i
= 0; i
< MAX_ATTRS
; i
++)
574 device_remove_file(dev
, &tdata
->sd_attrs
[i
].dev_attr
);
576 kfree(pdata
->core_data
[indx
]);
577 pdata
->core_data
[indx
] = NULL
;
580 static int __devinit
coretemp_probe(struct platform_device
*pdev
)
582 struct platform_data
*pdata
;
585 /* Check the microcode version of the CPU */
586 err
= chk_ucode_version(pdev
);
590 /* Initialize the per-package data structures */
591 pdata
= kzalloc(sizeof(struct platform_data
), GFP_KERNEL
);
595 err
= create_name_attr(pdata
, &pdev
->dev
);
599 pdata
->phys_proc_id
= TO_PHYS_ID(pdev
->id
);
600 platform_set_drvdata(pdev
, pdata
);
602 pdata
->hwmon_dev
= hwmon_device_register(&pdev
->dev
);
603 if (IS_ERR(pdata
->hwmon_dev
)) {
604 err
= PTR_ERR(pdata
->hwmon_dev
);
605 dev_err(&pdev
->dev
, "Class registration failed (%d)\n", err
);
611 device_remove_file(&pdev
->dev
, &pdata
->name_attr
);
612 platform_set_drvdata(pdev
, NULL
);
618 static int __devexit
coretemp_remove(struct platform_device
*pdev
)
620 struct platform_data
*pdata
= platform_get_drvdata(pdev
);
623 for (i
= MAX_CORE_DATA
- 1; i
>= 0; --i
)
624 if (pdata
->core_data
[i
])
625 coretemp_remove_core(pdata
, &pdev
->dev
, i
);
627 device_remove_file(&pdev
->dev
, &pdata
->name_attr
);
628 hwmon_device_unregister(pdata
->hwmon_dev
);
629 platform_set_drvdata(pdev
, NULL
);
634 static struct platform_driver coretemp_driver
= {
636 .owner
= THIS_MODULE
,
639 .probe
= coretemp_probe
,
640 .remove
= __devexit_p(coretemp_remove
),
643 static int __cpuinit
coretemp_device_add(unsigned int cpu
)
646 struct platform_device
*pdev
;
647 struct pdev_entry
*pdev_entry
;
649 mutex_lock(&pdev_list_mutex
);
651 pdev
= platform_device_alloc(DRVNAME
, cpu
);
654 pr_err("Device allocation failed\n");
658 pdev_entry
= kzalloc(sizeof(struct pdev_entry
), GFP_KERNEL
);
661 goto exit_device_put
;
664 err
= platform_device_add(pdev
);
666 pr_err("Device addition failed (%d)\n", err
);
667 goto exit_device_free
;
670 pdev_entry
->pdev
= pdev
;
671 pdev_entry
->cpu
= cpu
;
672 pdev_entry
->phys_proc_id
= TO_PHYS_ID(cpu
);
673 pdev_entry
->cpu_core_id
= TO_CORE_ID(cpu
);
675 list_add_tail(&pdev_entry
->list
, &pdev_list
);
676 mutex_unlock(&pdev_list_mutex
);
683 platform_device_put(pdev
);
685 mutex_unlock(&pdev_list_mutex
);
689 static void coretemp_device_remove(unsigned int cpu
)
691 struct pdev_entry
*p
, *n
;
692 u16 phys_proc_id
= TO_PHYS_ID(cpu
);
694 mutex_lock(&pdev_list_mutex
);
695 list_for_each_entry_safe(p
, n
, &pdev_list
, list
) {
696 if (p
->phys_proc_id
!= phys_proc_id
)
698 platform_device_unregister(p
->pdev
);
702 mutex_unlock(&pdev_list_mutex
);
705 static bool is_any_core_online(struct platform_data
*pdata
)
709 /* Find online cores, except pkgtemp data */
710 for (i
= MAX_CORE_DATA
- 1; i
>= 0; --i
) {
711 if (pdata
->core_data
[i
] &&
712 !pdata
->core_data
[i
]->is_pkg_data
) {
719 static void __cpuinit
get_core_online(unsigned int cpu
)
721 struct cpuinfo_x86
*c
= &cpu_data(cpu
);
722 struct platform_device
*pdev
= coretemp_get_pdev(cpu
);
726 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
727 * sensors. We check this bit only, all the early CPUs
728 * without thermal sensors will be filtered out.
730 if (!cpu_has(c
, X86_FEATURE_DTS
))
735 * Alright, we have DTS support.
736 * We are bringing the _first_ core in this pkg
737 * online. So, initialize per-pkg data structures and
738 * then bring this core online.
740 err
= coretemp_device_add(cpu
);
744 * Check whether pkgtemp support is available.
745 * If so, add interfaces for pkgtemp.
747 if (cpu_has(c
, X86_FEATURE_PTS
))
748 coretemp_add_core(cpu
, 1);
751 * Physical CPU device already exists.
752 * So, just add interfaces for this core.
754 coretemp_add_core(cpu
, 0);
757 static void __cpuinit
put_core_offline(unsigned int cpu
)
760 struct platform_data
*pdata
;
761 struct platform_device
*pdev
= coretemp_get_pdev(cpu
);
763 /* If the physical CPU device does not exist, just return */
767 pdata
= platform_get_drvdata(pdev
);
769 indx
= TO_ATTR_NO(cpu
);
771 if (pdata
->core_data
[indx
] && pdata
->core_data
[indx
]->cpu
== cpu
)
772 coretemp_remove_core(pdata
, &pdev
->dev
, indx
);
775 * If a HT sibling of a core is taken offline, but another HT sibling
776 * of the same core is still online, register the alternate sibling.
777 * This ensures that exactly one set of attributes is provided as long
778 * as at least one HT sibling of a core is online.
780 for_each_sibling(i
, cpu
) {
784 * Display temperature sensor data for one HT sibling
785 * per core only, so abort the loop after one such
786 * sibling has been found.
792 * If all cores in this pkg are offline, remove the device.
793 * coretemp_device_remove calls unregister_platform_device,
794 * which in turn calls coretemp_remove. This removes the
795 * pkgtemp entry and does other clean ups.
797 if (!is_any_core_online(pdata
))
798 coretemp_device_remove(cpu
);
801 static int __cpuinit
coretemp_cpu_callback(struct notifier_block
*nfb
,
802 unsigned long action
, void *hcpu
)
804 unsigned int cpu
= (unsigned long) hcpu
;
808 case CPU_DOWN_FAILED
:
809 get_core_online(cpu
);
811 case CPU_DOWN_PREPARE
:
812 put_core_offline(cpu
);
818 static struct notifier_block coretemp_cpu_notifier __refdata
= {
819 .notifier_call
= coretemp_cpu_callback
,
822 static int __init
coretemp_init(void)
824 int i
, err
= -ENODEV
;
826 /* quick check if we run Intel */
827 if (cpu_data(0).x86_vendor
!= X86_VENDOR_INTEL
)
830 err
= platform_driver_register(&coretemp_driver
);
834 for_each_online_cpu(i
)
837 #ifndef CONFIG_HOTPLUG_CPU
838 if (list_empty(&pdev_list
)) {
840 goto exit_driver_unreg
;
844 register_hotcpu_notifier(&coretemp_cpu_notifier
);
847 #ifndef CONFIG_HOTPLUG_CPU
849 platform_driver_unregister(&coretemp_driver
);
855 static void __exit
coretemp_exit(void)
857 struct pdev_entry
*p
, *n
;
859 unregister_hotcpu_notifier(&coretemp_cpu_notifier
);
860 mutex_lock(&pdev_list_mutex
);
861 list_for_each_entry_safe(p
, n
, &pdev_list
, list
) {
862 platform_device_unregister(p
->pdev
);
866 mutex_unlock(&pdev_list_mutex
);
867 platform_driver_unregister(&coretemp_driver
);
870 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
871 MODULE_DESCRIPTION("Intel Core temperature monitor");
872 MODULE_LICENSE("GPL");
874 module_init(coretemp_init
)
875 module_exit(coretemp_exit
)