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>
39 #include <linux/pci.h>
41 #include <asm/processor.h>
42 #include <asm/cpu_device_id.h>
44 #define DRVNAME "coretemp"
47 * force_tjmax only matters when TjMax can't be read from the CPU itself.
48 * When set, it replaces the driver's suboptimal heuristic.
50 static int force_tjmax;
51 module_param_named(tjmax, force_tjmax, int, 0444);
52 MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
54 #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
55 #define NUM_REAL_CORES 32 /* Number of Real cores per cpu */
56 #define CORETEMP_NAME_LENGTH 19 /* String Length of attrs */
57 #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
58 #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
59 #define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
61 #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
62 #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
63 #define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO)
66 #define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu))
68 #define for_each_sibling(i, cpu) for (i = 0; false; )
72 * Per-Core Temperature Data
73 * @last_updated: The time when the current temperature value was updated
74 * earlier (in jiffies).
75 * @cpu_core_id: The CPU Core from which temperature values should be read
76 * This value is passed as "id" field to rdmsr/wrmsr functions.
77 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
78 * from where the temperature values should be read.
79 * @attr_size: Total number of pre-core attrs displayed in the sysfs.
80 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
81 * Otherwise, temp_data holds coretemp data.
82 * @valid: If this is 1, the current temperature is valid.
88 unsigned long last_updated;
95 struct sensor_device_attribute sd_attrs[TOTAL_ATTRS];
96 char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH];
97 struct attribute *attrs[TOTAL_ATTRS + 1];
98 struct attribute_group attr_group;
99 struct mutex update_lock;
102 /* Platform Data per Physical CPU */
103 struct platform_data {
104 struct device *hwmon_dev;
106 struct temp_data *core_data[MAX_CORE_DATA];
107 struct device_attribute name_attr;
111 struct list_head list;
112 struct platform_device *pdev;
116 static LIST_HEAD(pdev_list);
117 static DEFINE_MUTEX(pdev_list_mutex);
119 static ssize_t show_name(struct device *dev,
120 struct device_attribute *devattr, char *buf)
122 return sprintf(buf, "%s\n", DRVNAME);
125 static ssize_t show_label(struct device *dev,
126 struct device_attribute *devattr, char *buf)
128 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
129 struct platform_data *pdata = dev_get_drvdata(dev);
130 struct temp_data *tdata = pdata->core_data[attr->index];
132 if (tdata->is_pkg_data)
133 return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
135 return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
138 static ssize_t show_crit_alarm(struct device *dev,
139 struct device_attribute *devattr, char *buf)
142 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
143 struct platform_data *pdata = dev_get_drvdata(dev);
144 struct temp_data *tdata = pdata->core_data[attr->index];
146 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
148 return sprintf(buf, "%d\n", (eax >> 5) & 1);
151 static ssize_t show_tjmax(struct device *dev,
152 struct device_attribute *devattr, char *buf)
154 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
155 struct platform_data *pdata = dev_get_drvdata(dev);
157 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
160 static ssize_t show_ttarget(struct device *dev,
161 struct device_attribute *devattr, char *buf)
163 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
164 struct platform_data *pdata = dev_get_drvdata(dev);
166 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
169 static ssize_t show_temp(struct device *dev,
170 struct device_attribute *devattr, char *buf)
173 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
174 struct platform_data *pdata = dev_get_drvdata(dev);
175 struct temp_data *tdata = pdata->core_data[attr->index];
177 mutex_lock(&tdata->update_lock);
179 /* Check whether the time interval has elapsed */
180 if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) {
181 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
183 * Ignore the valid bit. In all observed cases the register
184 * value is either low or zero if the valid bit is 0.
185 * Return it instead of reporting an error which doesn't
186 * really help at all.
188 tdata->temp = tdata->tjmax - ((eax >> 16) & 0x7f) * 1000;
190 tdata->last_updated = jiffies;
193 mutex_unlock(&tdata->update_lock);
194 return sprintf(buf, "%d\n", tdata->temp);
202 static const struct tjmax_pci tjmax_pci_table[] = {
203 { 0x0708, 110000 }, /* CE41x0 (Sodaville ) */
204 { 0x0c72, 102000 }, /* Atom S1240 (Centerton) */
205 { 0x0c73, 95000 }, /* Atom S1220 (Centerton) */
206 { 0x0c75, 95000 }, /* Atom S1260 (Centerton) */
214 static const struct tjmax tjmax_table[] = {
215 { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
216 { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
227 static const struct tjmax_model tjmax_model_table[] = {
228 { 0x1c, 10, 100000 }, /* D4xx, K4xx, N4xx, D5xx, K5xx, N5xx */
229 { 0x1c, ANY, 90000 }, /* Z5xx, N2xx, possibly others
230 * Note: Also matches 230 and 330,
231 * which are covered by tjmax_table
233 { 0x26, ANY, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx)
234 * Note: TjMax for E6xxT is 110C, but CPU type
235 * is undetectable by software
237 { 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */
238 { 0x35, ANY, 90000 }, /* Atom Clover Trail/Cloverview (Z27x0) */
239 { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx)
240 * Also matches S12x0 (stepping 9), covered by
245 static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
247 /* The 100C is default for both mobile and non mobile CPUs */
250 int tjmax_ee = 85000;
255 struct pci_dev *host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
258 * Explicit tjmax table entries override heuristics.
259 * First try PCI host bridge IDs, followed by model ID strings
260 * and model/stepping information.
262 if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL) {
263 for (i = 0; i < ARRAY_SIZE(tjmax_pci_table); i++) {
264 if (host_bridge->device == tjmax_pci_table[i].device)
265 return tjmax_pci_table[i].tjmax;
269 for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
270 if (strstr(c->x86_model_id, tjmax_table[i].id))
271 return tjmax_table[i].tjmax;
274 for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
275 const struct tjmax_model *tm = &tjmax_model_table[i];
276 if (c->x86_model == tm->model &&
277 (tm->mask == ANY || c->x86_mask == tm->mask))
281 /* Early chips have no MSR for TjMax */
283 if (c->x86_model == 0xf && c->x86_mask < 4)
286 if (c->x86_model > 0xe && usemsr_ee) {
290 * Now we can detect the mobile CPU using Intel provided table
291 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
292 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
294 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
297 "Unable to access MSR 0x17, assuming desktop"
300 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
302 * Trust bit 28 up to Penryn, I could not find any
303 * documentation on that; if you happen to know
304 * someone at Intel please ask
308 /* Platform ID bits 52:50 (EDX starts at bit 32) */
309 platform_id = (edx >> 18) & 0x7;
312 * Mobile Penryn CPU seems to be platform ID 7 or 5
315 if (c->x86_model == 0x17 &&
316 (platform_id == 5 || platform_id == 7)) {
318 * If MSR EE bit is set, set it to 90 degrees C,
319 * otherwise 105 degrees C
328 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
331 "Unable to access MSR 0xEE, for Tjmax, left"
333 } else if (eax & 0x40000000) {
336 } else if (tjmax == 100000) {
338 * If we don't use msr EE it means we are desktop CPU
339 * (with exeception of Atom)
341 dev_warn(dev, "Using relative temperature scale!\n");
347 static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
349 u8 model = c->x86_model;
351 return model > 0xe &&
359 static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
366 * A new feature of current Intel(R) processors, the
367 * IA32_TEMPERATURE_TARGET contains the TjMax value
369 err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
371 if (cpu_has_tjmax(c))
372 dev_warn(dev, "Unable to read TjMax from CPU %u\n", id);
374 val = (eax >> 16) & 0x7f;
376 * If the TjMax is not plausible, an assumption
380 dev_dbg(dev, "TjMax is %d degrees C\n", val);
386 dev_notice(dev, "TjMax forced to %d degrees C by user\n",
388 return force_tjmax * 1000;
392 * An assumption is made for early CPUs and unreadable MSR.
393 * NOTE: the calculated value may not be correct.
395 return adjust_tjmax(c, id, dev);
398 static int create_name_attr(struct platform_data *pdata,
401 sysfs_attr_init(&pdata->name_attr.attr);
402 pdata->name_attr.attr.name = "name";
403 pdata->name_attr.attr.mode = S_IRUGO;
404 pdata->name_attr.show = show_name;
405 return device_create_file(dev, &pdata->name_attr);
408 static int create_core_attrs(struct temp_data *tdata, struct device *dev,
412 static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
413 struct device_attribute *devattr, char *buf) = {
414 show_label, show_crit_alarm, show_temp, show_tjmax,
416 static const char *const names[TOTAL_ATTRS] = {
417 "temp%d_label", "temp%d_crit_alarm",
418 "temp%d_input", "temp%d_crit",
421 for (i = 0; i < tdata->attr_size; i++) {
422 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i],
424 sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
425 tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
426 tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO;
427 tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
428 tdata->sd_attrs[i].index = attr_no;
429 tdata->attrs[i] = &tdata->sd_attrs[i].dev_attr.attr;
431 tdata->attr_group.attrs = tdata->attrs;
432 return sysfs_create_group(&dev->kobj, &tdata->attr_group);
436 static int chk_ucode_version(unsigned int cpu)
438 struct cpuinfo_x86 *c = &cpu_data(cpu);
441 * Check if we have problem with errata AE18 of Core processors:
442 * Readings might stop update when processor visited too deep sleep,
443 * fixed for stepping D0 (6EC).
445 if (c->x86_model == 0xe && c->x86_mask < 0xc && c->microcode < 0x39) {
446 pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
452 static struct platform_device *coretemp_get_pdev(unsigned int cpu)
454 u16 phys_proc_id = TO_PHYS_ID(cpu);
455 struct pdev_entry *p;
457 mutex_lock(&pdev_list_mutex);
459 list_for_each_entry(p, &pdev_list, list)
460 if (p->phys_proc_id == phys_proc_id) {
461 mutex_unlock(&pdev_list_mutex);
465 mutex_unlock(&pdev_list_mutex);
469 static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
471 struct temp_data *tdata;
473 tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
477 tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
478 MSR_IA32_THERM_STATUS;
479 tdata->is_pkg_data = pkg_flag;
481 tdata->cpu_core_id = TO_CORE_ID(cpu);
482 tdata->attr_size = MAX_CORE_ATTRS;
483 mutex_init(&tdata->update_lock);
487 static int create_core_data(struct platform_device *pdev, unsigned int cpu,
490 struct temp_data *tdata;
491 struct platform_data *pdata = platform_get_drvdata(pdev);
492 struct cpuinfo_x86 *c = &cpu_data(cpu);
497 * Find attr number for sysfs:
498 * We map the attr number to core id of the CPU
499 * The attr number is always core id + 2
500 * The Pkgtemp will always show up as temp1_*, if available
502 attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu);
504 if (attr_no > MAX_CORE_DATA - 1)
508 * Provide a single set of attributes for all HT siblings of a core
509 * to avoid duplicate sensors (the processor ID and core ID of all
510 * HT siblings of a core are the same).
511 * Skip if a HT sibling of this core is already registered.
512 * This is not an error.
514 if (pdata->core_data[attr_no] != NULL)
517 tdata = init_temp_data(cpu, pkg_flag);
521 /* Test if we can access the status register */
522 err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx);
526 /* We can access status register. Get Critical Temperature */
527 tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
530 * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET.
531 * The target temperature is available on older CPUs but not in this
532 * register. Atoms don't have the register at all.
534 if (c->x86_model > 0xe && c->x86_model != 0x1c) {
535 err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET,
539 = tdata->tjmax - ((eax >> 8) & 0xff) * 1000;
544 pdata->core_data[attr_no] = tdata;
546 /* Create sysfs interfaces */
547 err = create_core_attrs(tdata, &pdev->dev, attr_no);
553 pdata->core_data[attr_no] = NULL;
558 static void coretemp_add_core(unsigned int cpu, int pkg_flag)
560 struct platform_device *pdev = coretemp_get_pdev(cpu);
566 err = create_core_data(pdev, cpu, pkg_flag);
568 dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
571 static void coretemp_remove_core(struct platform_data *pdata,
572 struct device *dev, int indx)
574 struct temp_data *tdata = pdata->core_data[indx];
576 /* Remove the sysfs attributes */
577 sysfs_remove_group(&dev->kobj, &tdata->attr_group);
579 kfree(pdata->core_data[indx]);
580 pdata->core_data[indx] = NULL;
583 static int coretemp_probe(struct platform_device *pdev)
585 struct device *dev = &pdev->dev;
586 struct platform_data *pdata;
589 /* Initialize the per-package data structures */
590 pdata = devm_kzalloc(dev, sizeof(struct platform_data), GFP_KERNEL);
594 err = create_name_attr(pdata, dev);
598 pdata->phys_proc_id = pdev->id;
599 platform_set_drvdata(pdev, pdata);
601 pdata->hwmon_dev = hwmon_device_register(dev);
602 if (IS_ERR(pdata->hwmon_dev)) {
603 err = PTR_ERR(pdata->hwmon_dev);
604 dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
610 device_remove_file(&pdev->dev, &pdata->name_attr);
614 static int coretemp_remove(struct platform_device *pdev)
616 struct platform_data *pdata = platform_get_drvdata(pdev);
619 for (i = MAX_CORE_DATA - 1; i >= 0; --i)
620 if (pdata->core_data[i])
621 coretemp_remove_core(pdata, &pdev->dev, i);
623 device_remove_file(&pdev->dev, &pdata->name_attr);
624 hwmon_device_unregister(pdata->hwmon_dev);
628 static struct platform_driver coretemp_driver = {
630 .owner = THIS_MODULE,
633 .probe = coretemp_probe,
634 .remove = coretemp_remove,
637 static int coretemp_device_add(unsigned int cpu)
640 struct platform_device *pdev;
641 struct pdev_entry *pdev_entry;
643 mutex_lock(&pdev_list_mutex);
645 pdev = platform_device_alloc(DRVNAME, TO_PHYS_ID(cpu));
648 pr_err("Device allocation failed\n");
652 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
655 goto exit_device_put;
658 err = platform_device_add(pdev);
660 pr_err("Device addition failed (%d)\n", err);
661 goto exit_device_free;
664 pdev_entry->pdev = pdev;
665 pdev_entry->phys_proc_id = pdev->id;
667 list_add_tail(&pdev_entry->list, &pdev_list);
668 mutex_unlock(&pdev_list_mutex);
675 platform_device_put(pdev);
677 mutex_unlock(&pdev_list_mutex);
681 static void coretemp_device_remove(unsigned int cpu)
683 struct pdev_entry *p, *n;
684 u16 phys_proc_id = TO_PHYS_ID(cpu);
686 mutex_lock(&pdev_list_mutex);
687 list_for_each_entry_safe(p, n, &pdev_list, list) {
688 if (p->phys_proc_id != phys_proc_id)
690 platform_device_unregister(p->pdev);
694 mutex_unlock(&pdev_list_mutex);
697 static bool is_any_core_online(struct platform_data *pdata)
701 /* Find online cores, except pkgtemp data */
702 for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
703 if (pdata->core_data[i] &&
704 !pdata->core_data[i]->is_pkg_data) {
711 static void get_core_online(unsigned int cpu)
713 struct cpuinfo_x86 *c = &cpu_data(cpu);
714 struct platform_device *pdev = coretemp_get_pdev(cpu);
718 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
719 * sensors. We check this bit only, all the early CPUs
720 * without thermal sensors will be filtered out.
722 if (!cpu_has(c, X86_FEATURE_DTHERM))
726 /* Check the microcode version of the CPU */
727 if (chk_ucode_version(cpu))
731 * Alright, we have DTS support.
732 * We are bringing the _first_ core in this pkg
733 * online. So, initialize per-pkg data structures and
734 * then bring this core online.
736 err = coretemp_device_add(cpu);
740 * Check whether pkgtemp support is available.
741 * If so, add interfaces for pkgtemp.
743 if (cpu_has(c, X86_FEATURE_PTS))
744 coretemp_add_core(cpu, 1);
747 * Physical CPU device already exists.
748 * So, just add interfaces for this core.
750 coretemp_add_core(cpu, 0);
753 static void put_core_offline(unsigned int cpu)
756 struct platform_data *pdata;
757 struct platform_device *pdev = coretemp_get_pdev(cpu);
759 /* If the physical CPU device does not exist, just return */
763 pdata = platform_get_drvdata(pdev);
765 indx = TO_ATTR_NO(cpu);
767 /* The core id is too big, just return */
768 if (indx > MAX_CORE_DATA - 1)
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 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 const struct x86_cpu_id __initconst coretemp_ids[] = {
823 { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM },
826 MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
828 static int __init coretemp_init(void)
833 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
834 * sensors. We check this bit only, all the early CPUs
835 * without thermal sensors will be filtered out.
837 if (!x86_match_cpu(coretemp_ids))
840 err = platform_driver_register(&coretemp_driver);
845 for_each_online_cpu(i)
848 #ifndef CONFIG_HOTPLUG_CPU
849 if (list_empty(&pdev_list)) {
852 goto exit_driver_unreg;
856 register_hotcpu_notifier(&coretemp_cpu_notifier);
860 #ifndef CONFIG_HOTPLUG_CPU
862 platform_driver_unregister(&coretemp_driver);
868 static void __exit coretemp_exit(void)
870 struct pdev_entry *p, *n;
873 unregister_hotcpu_notifier(&coretemp_cpu_notifier);
874 mutex_lock(&pdev_list_mutex);
875 list_for_each_entry_safe(p, n, &pdev_list, list) {
876 platform_device_unregister(p->pdev);
880 mutex_unlock(&pdev_list_mutex);
882 platform_driver_unregister(&coretemp_driver);
885 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
886 MODULE_DESCRIPTION("Intel Core temperature monitor");
887 MODULE_LICENSE("GPL");
889 module_init(coretemp_init)
890 module_exit(coretemp_exit)