blob: 2988da150ed6f7a223e64e892eed6d1ca2a18895 [file] [log] [blame]
Rudolf Marekbebe4672007-05-08 17:22:02 +02001/*
2 * coretemp.c - Linux kernel module for hardware monitoring
3 *
4 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
5 *
6 * Inspired from many hwmon drivers
7 *
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.
11 *
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.
16 *
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
20 * 02110-1301 USA.
21 */
22
23#include <linux/module.h>
24#include <linux/delay.h>
25#include <linux/init.h>
26#include <linux/slab.h>
27#include <linux/jiffies.h>
28#include <linux/hwmon.h>
29#include <linux/sysfs.h>
30#include <linux/hwmon-sysfs.h>
31#include <linux/err.h>
32#include <linux/mutex.h>
33#include <linux/list.h>
34#include <linux/platform_device.h>
35#include <linux/cpu.h>
Yong Wang1fe63ab2010-01-10 20:52:34 +010036#include <linux/pci.h>
Rudolf Marekbebe4672007-05-08 17:22:02 +020037#include <asm/msr.h>
38#include <asm/processor.h>
39
40#define DRVNAME "coretemp"
41
Rudolf Marek6369a2882008-01-18 00:42:54 +010042typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL,
43 SHOW_NAME } SHOW;
Rudolf Marekbebe4672007-05-08 17:22:02 +020044
45/*
46 * Functions declaration
47 */
48
49static struct coretemp_data *coretemp_update_device(struct device *dev);
50
51struct coretemp_data {
Tony Jones1beeffe2007-08-20 13:46:20 -070052 struct device *hwmon_dev;
Rudolf Marekbebe4672007-05-08 17:22:02 +020053 struct mutex update_lock;
54 const char *name;
55 u32 id;
56 char valid; /* zero until following fields are valid */
57 unsigned long last_updated; /* in jiffies */
58 int temp;
59 int tjmax;
Rudolf Marek6369a2882008-01-18 00:42:54 +010060 int ttarget;
Rudolf Marekbebe4672007-05-08 17:22:02 +020061 u8 alarm;
62};
63
Rudolf Marekbebe4672007-05-08 17:22:02 +020064/*
65 * Sysfs stuff
66 */
67
68static ssize_t show_name(struct device *dev, struct device_attribute
69 *devattr, char *buf)
70{
71 int ret;
72 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
73 struct coretemp_data *data = dev_get_drvdata(dev);
74
75 if (attr->index == SHOW_NAME)
76 ret = sprintf(buf, "%s\n", data->name);
77 else /* show label */
78 ret = sprintf(buf, "Core %d\n", data->id);
79 return ret;
80}
81
82static ssize_t show_alarm(struct device *dev, struct device_attribute
83 *devattr, char *buf)
84{
85 struct coretemp_data *data = coretemp_update_device(dev);
86 /* read the Out-of-spec log, never clear */
87 return sprintf(buf, "%d\n", data->alarm);
88}
89
90static ssize_t show_temp(struct device *dev,
91 struct device_attribute *devattr, char *buf)
92{
93 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
94 struct coretemp_data *data = coretemp_update_device(dev);
95 int err;
96
97 if (attr->index == SHOW_TEMP)
98 err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN;
Rudolf Marek6369a2882008-01-18 00:42:54 +010099 else if (attr->index == SHOW_TJMAX)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200100 err = sprintf(buf, "%d\n", data->tjmax);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100101 else
102 err = sprintf(buf, "%d\n", data->ttarget);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200103 return err;
104}
105
106static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
107 SHOW_TEMP);
108static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL,
109 SHOW_TJMAX);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100110static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL,
111 SHOW_TTARGET);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200112static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
113static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
114static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
115
116static struct attribute *coretemp_attributes[] = {
117 &sensor_dev_attr_name.dev_attr.attr,
118 &sensor_dev_attr_temp1_label.dev_attr.attr,
119 &dev_attr_temp1_crit_alarm.attr,
120 &sensor_dev_attr_temp1_input.dev_attr.attr,
121 &sensor_dev_attr_temp1_crit.dev_attr.attr,
122 NULL
123};
124
125static const struct attribute_group coretemp_group = {
126 .attrs = coretemp_attributes,
127};
128
129static struct coretemp_data *coretemp_update_device(struct device *dev)
130{
131 struct coretemp_data *data = dev_get_drvdata(dev);
132
133 mutex_lock(&data->update_lock);
134
135 if (!data->valid || time_after(jiffies, data->last_updated + HZ)) {
136 u32 eax, edx;
137
138 data->valid = 0;
139 rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
140 data->alarm = (eax >> 5) & 1;
141 /* update only if data has been valid */
142 if (eax & 0x80000000) {
143 data->temp = data->tjmax - (((eax >> 16)
144 & 0x7f) * 1000);
145 data->valid = 1;
146 } else {
147 dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax);
148 }
149 data->last_updated = jiffies;
150 }
151
152 mutex_unlock(&data->update_lock);
153 return data;
154}
155
Rudolf Marek118a8872008-02-17 22:59:39 +0100156static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
157{
158 /* The 100C is default for both mobile and non mobile CPUs */
159
160 int tjmax = 100000;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200161 int tjmax_ee = 85000;
Rudolf Marek708a62b2009-09-23 22:59:42 +0200162 int usemsr_ee = 1;
Rudolf Marek118a8872008-02-17 22:59:39 +0100163 int err;
164 u32 eax, edx;
Yong Wang1fe63ab2010-01-10 20:52:34 +0100165 struct pci_dev *host_bridge;
Rudolf Marek118a8872008-02-17 22:59:39 +0100166
167 /* Early chips have no MSR for TjMax */
168
169 if ((c->x86_model == 0xf) && (c->x86_mask < 4)) {
Rudolf Marek708a62b2009-09-23 22:59:42 +0200170 usemsr_ee = 0;
Rudolf Marek118a8872008-02-17 22:59:39 +0100171 }
172
Yong Wang1fe63ab2010-01-10 20:52:34 +0100173 /* Atom CPUs */
Rudolf Marek708a62b2009-09-23 22:59:42 +0200174
175 if (c->x86_model == 0x1c) {
176 usemsr_ee = 0;
Yong Wang1fe63ab2010-01-10 20:52:34 +0100177
178 host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
179
180 if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL
181 && (host_bridge->device == 0xa000 /* NM10 based nettop */
182 || host_bridge->device == 0xa010)) /* NM10 based netbook */
183 tjmax = 100000;
184 else
185 tjmax = 90000;
186
187 pci_dev_put(host_bridge);
Rudolf Marek708a62b2009-09-23 22:59:42 +0200188 }
189
190 if ((c->x86_model > 0xe) && (usemsr_ee)) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200191 u8 platform_id;
Rudolf Marek118a8872008-02-17 22:59:39 +0100192
193 /* Now we can detect the mobile CPU using Intel provided table
194 http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
195 For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
196 */
197
198 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
199 if (err) {
200 dev_warn(dev,
201 "Unable to access MSR 0x17, assuming desktop"
202 " CPU\n");
Rudolf Marek708a62b2009-09-23 22:59:42 +0200203 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200204 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
205 /* Trust bit 28 up to Penryn, I could not find any
206 documentation on that; if you happen to know
207 someone at Intel please ask */
Rudolf Marek708a62b2009-09-23 22:59:42 +0200208 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200209 } else {
210 /* Platform ID bits 52:50 (EDX starts at bit 32) */
211 platform_id = (edx >> 18) & 0x7;
212
213 /* Mobile Penryn CPU seems to be platform ID 7 or 5
214 (guesswork) */
215 if ((c->x86_model == 0x17) &&
216 ((platform_id == 5) || (platform_id == 7))) {
217 /* If MSR EE bit is set, set it to 90 degrees C,
218 otherwise 105 degrees C */
219 tjmax_ee = 90000;
220 tjmax = 105000;
221 }
Rudolf Marek118a8872008-02-17 22:59:39 +0100222 }
223 }
224
Rudolf Marek708a62b2009-09-23 22:59:42 +0200225 if (usemsr_ee) {
Rudolf Marek118a8872008-02-17 22:59:39 +0100226
227 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
228 if (err) {
229 dev_warn(dev,
230 "Unable to access MSR 0xEE, for Tjmax, left"
Dean Nelson4d7a5642010-03-29 22:03:00 +0200231 " at default\n");
Rudolf Marek118a8872008-02-17 22:59:39 +0100232 } else if (eax & 0x40000000) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200233 tjmax = tjmax_ee;
Rudolf Marek118a8872008-02-17 22:59:39 +0100234 }
Rudolf Marek708a62b2009-09-23 22:59:42 +0200235 /* if we dont use msr EE it means we are desktop CPU (with exeception
236 of Atom) */
237 } else if (tjmax == 100000) {
Rudolf Marek118a8872008-02-17 22:59:39 +0100238 dev_warn(dev, "Using relative temperature scale!\n");
239 }
240
241 return tjmax;
242}
243
Carsten Emdea321ced2010-05-24 14:33:41 -0700244static int __devinit get_tjmax(struct cpuinfo_x86 *c, u32 id,
245 struct device *dev)
246{
247 /* The 100C is default for both mobile and non mobile CPUs */
248 int err;
249 u32 eax, edx;
250 u32 val;
251
252 /* A new feature of current Intel(R) processors, the
253 IA32_TEMPERATURE_TARGET contains the TjMax value */
254 err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
255 if (err) {
256 dev_warn(dev, "Unable to read TjMax from CPU.\n");
257 } else {
258 val = (eax >> 16) & 0xff;
259 /*
260 * If the TjMax is not plausible, an assumption
261 * will be used
262 */
263 if ((val > 80) && (val < 120)) {
264 dev_info(dev, "TjMax is %d C.\n", val);
265 return val * 1000;
266 }
267 }
268
269 /*
270 * An assumption is made for early CPUs and unreadable MSR.
271 * NOTE: the given value may not be correct.
272 */
273
274 switch (c->x86_model) {
275 case 0xe:
276 case 0xf:
277 case 0x16:
278 case 0x1a:
279 dev_warn(dev, "TjMax is assumed as 100 C!\n");
280 return 100000;
281 break;
282 case 0x17:
283 case 0x1c: /* Atom CPUs */
284 return adjust_tjmax(c, id, dev);
285 break;
286 default:
287 dev_warn(dev, "CPU (model=0x%x) is not supported yet,"
288 " using default TjMax of 100C.\n", c->x86_model);
289 return 100000;
290 }
291}
292
Rudolf Marekbebe4672007-05-08 17:22:02 +0200293static int __devinit coretemp_probe(struct platform_device *pdev)
294{
295 struct coretemp_data *data;
Mike Travis92cb7612007-10-19 20:35:04 +0200296 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200297 int err;
298 u32 eax, edx;
299
300 if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) {
301 err = -ENOMEM;
302 dev_err(&pdev->dev, "Out of memory\n");
303 goto exit;
304 }
305
306 data->id = pdev->id;
307 data->name = "coretemp";
308 mutex_init(&data->update_lock);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200309
310 /* test if we can access the THERM_STATUS MSR */
311 err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
312 if (err) {
313 dev_err(&pdev->dev,
314 "Unable to access THERM_STATUS MSR, giving up\n");
315 goto exit_free;
316 }
317
Rudolf Marek67f363b2007-05-27 22:17:43 +0200318 /* Check if we have problem with errata AE18 of Core processors:
319 Readings might stop update when processor visited too deep sleep,
320 fixed for stepping D0 (6EC).
321 */
322
323 if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) {
324 /* check for microcode update */
325 rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx);
326 if (edx < 0x39) {
Jean Delvare6d79af72007-06-23 17:16:24 -0700327 err = -ENODEV;
Rudolf Marek67f363b2007-05-27 22:17:43 +0200328 dev_err(&pdev->dev,
329 "Errata AE18 not fixed, update BIOS or "
330 "microcode of the CPU!\n");
331 goto exit_free;
332 }
333 }
334
Carsten Emdea321ced2010-05-24 14:33:41 -0700335 data->tjmax = get_tjmax(c, data->id, &pdev->dev);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200336 platform_set_drvdata(pdev, data);
337
Carsten Emdea321ced2010-05-24 14:33:41 -0700338 /*
339 * read the still undocumented IA32_TEMPERATURE_TARGET. It exists
340 * on older CPUs but not in this register,
341 * Atoms don't have it either.
342 */
Rudolf Marek6369a2882008-01-18 00:42:54 +0100343
Rudolf Marek708a62b2009-09-23 22:59:42 +0200344 if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) {
Carsten Emdea321ced2010-05-24 14:33:41 -0700345 err = rdmsr_safe_on_cpu(data->id, MSR_IA32_TEMPERATURE_TARGET,
346 &eax, &edx);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100347 if (err) {
348 dev_warn(&pdev->dev, "Unable to read"
349 " IA32_TEMPERATURE_TARGET MSR\n");
350 } else {
351 data->ttarget = data->tjmax -
352 (((eax >> 8) & 0xff) * 1000);
353 err = device_create_file(&pdev->dev,
354 &sensor_dev_attr_temp1_max.dev_attr);
355 if (err)
356 goto exit_free;
357 }
358 }
359
Rudolf Marekbebe4672007-05-08 17:22:02 +0200360 if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
Rudolf Marek6369a2882008-01-18 00:42:54 +0100361 goto exit_dev;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200362
Tony Jones1beeffe2007-08-20 13:46:20 -0700363 data->hwmon_dev = hwmon_device_register(&pdev->dev);
364 if (IS_ERR(data->hwmon_dev)) {
365 err = PTR_ERR(data->hwmon_dev);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200366 dev_err(&pdev->dev, "Class registration failed (%d)\n",
367 err);
368 goto exit_class;
369 }
370
371 return 0;
372
373exit_class:
374 sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100375exit_dev:
376 device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200377exit_free:
378 kfree(data);
379exit:
380 return err;
381}
382
383static int __devexit coretemp_remove(struct platform_device *pdev)
384{
385 struct coretemp_data *data = platform_get_drvdata(pdev);
386
Tony Jones1beeffe2007-08-20 13:46:20 -0700387 hwmon_device_unregister(data->hwmon_dev);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200388 sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100389 device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200390 platform_set_drvdata(pdev, NULL);
391 kfree(data);
392 return 0;
393}
394
395static struct platform_driver coretemp_driver = {
396 .driver = {
397 .owner = THIS_MODULE,
398 .name = DRVNAME,
399 },
400 .probe = coretemp_probe,
401 .remove = __devexit_p(coretemp_remove),
402};
403
404struct pdev_entry {
405 struct list_head list;
406 struct platform_device *pdev;
407 unsigned int cpu;
408};
409
410static LIST_HEAD(pdev_list);
411static DEFINE_MUTEX(pdev_list_mutex);
412
413static int __cpuinit coretemp_device_add(unsigned int cpu)
414{
415 int err;
416 struct platform_device *pdev;
417 struct pdev_entry *pdev_entry;
418
419 pdev = platform_device_alloc(DRVNAME, cpu);
420 if (!pdev) {
421 err = -ENOMEM;
422 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
423 goto exit;
424 }
425
426 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
427 if (!pdev_entry) {
428 err = -ENOMEM;
429 goto exit_device_put;
430 }
431
432 err = platform_device_add(pdev);
433 if (err) {
434 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
435 err);
436 goto exit_device_free;
437 }
438
439 pdev_entry->pdev = pdev;
440 pdev_entry->cpu = cpu;
441 mutex_lock(&pdev_list_mutex);
442 list_add_tail(&pdev_entry->list, &pdev_list);
443 mutex_unlock(&pdev_list_mutex);
444
445 return 0;
446
447exit_device_free:
448 kfree(pdev_entry);
449exit_device_put:
450 platform_device_put(pdev);
451exit:
452 return err;
453}
454
455#ifdef CONFIG_HOTPLUG_CPU
Adrian Bunkd2bc7b12007-07-06 01:23:06 +0200456static void coretemp_device_remove(unsigned int cpu)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200457{
458 struct pdev_entry *p, *n;
459 mutex_lock(&pdev_list_mutex);
460 list_for_each_entry_safe(p, n, &pdev_list, list) {
461 if (p->cpu == cpu) {
462 platform_device_unregister(p->pdev);
463 list_del(&p->list);
464 kfree(p);
465 }
466 }
467 mutex_unlock(&pdev_list_mutex);
468}
469
Sam Ravnborgba7c1922008-02-17 13:22:51 +0100470static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb,
Rudolf Marekbebe4672007-05-08 17:22:02 +0200471 unsigned long action, void *hcpu)
472{
473 unsigned int cpu = (unsigned long) hcpu;
474
475 switch (action) {
476 case CPU_ONLINE:
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100477 case CPU_DOWN_FAILED:
Rudolf Marekbebe4672007-05-08 17:22:02 +0200478 coretemp_device_add(cpu);
479 break;
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100480 case CPU_DOWN_PREPARE:
Rudolf Marekbebe4672007-05-08 17:22:02 +0200481 coretemp_device_remove(cpu);
482 break;
483 }
484 return NOTIFY_OK;
485}
486
Sam Ravnborgba7c1922008-02-17 13:22:51 +0100487static struct notifier_block coretemp_cpu_notifier __refdata = {
Rudolf Marekbebe4672007-05-08 17:22:02 +0200488 .notifier_call = coretemp_cpu_callback,
489};
490#endif /* !CONFIG_HOTPLUG_CPU */
491
492static int __init coretemp_init(void)
493{
494 int i, err = -ENODEV;
495 struct pdev_entry *p, *n;
496
Rudolf Marekbebe4672007-05-08 17:22:02 +0200497 /* quick check if we run Intel */
Mike Travis92cb7612007-10-19 20:35:04 +0200498 if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200499 goto exit;
500
501 err = platform_driver_register(&coretemp_driver);
502 if (err)
503 goto exit;
504
505 for_each_online_cpu(i) {
Mike Travis92cb7612007-10-19 20:35:04 +0200506 struct cpuinfo_x86 *c = &cpu_data(i);
Carsten Emde5db47b02010-05-24 14:33:39 -0700507 /*
508 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
509 * sensors. We check this bit only, all the early CPUs
510 * without thermal sensors will be filtered out.
511 */
512 if (c->cpuid_level >= 6 && (cpuid_eax(0x06) & 0x01)) {
513 err = coretemp_device_add(i);
514 if (err)
515 goto exit_devices_unreg;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200516
Carsten Emde5db47b02010-05-24 14:33:39 -0700517 } else {
518 printk(KERN_INFO DRVNAME ": CPU (model=0x%x)"
519 " has no thermal sensor.\n", c->x86_model);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200520 }
Rudolf Marekbebe4672007-05-08 17:22:02 +0200521 }
522 if (list_empty(&pdev_list)) {
523 err = -ENODEV;
524 goto exit_driver_unreg;
525 }
526
527#ifdef CONFIG_HOTPLUG_CPU
528 register_hotcpu_notifier(&coretemp_cpu_notifier);
529#endif
530 return 0;
531
532exit_devices_unreg:
533 mutex_lock(&pdev_list_mutex);
534 list_for_each_entry_safe(p, n, &pdev_list, list) {
535 platform_device_unregister(p->pdev);
536 list_del(&p->list);
537 kfree(p);
538 }
539 mutex_unlock(&pdev_list_mutex);
540exit_driver_unreg:
541 platform_driver_unregister(&coretemp_driver);
542exit:
543 return err;
544}
545
546static void __exit coretemp_exit(void)
547{
548 struct pdev_entry *p, *n;
549#ifdef CONFIG_HOTPLUG_CPU
550 unregister_hotcpu_notifier(&coretemp_cpu_notifier);
551#endif
552 mutex_lock(&pdev_list_mutex);
553 list_for_each_entry_safe(p, n, &pdev_list, list) {
554 platform_device_unregister(p->pdev);
555 list_del(&p->list);
556 kfree(p);
557 }
558 mutex_unlock(&pdev_list_mutex);
559 platform_driver_unregister(&coretemp_driver);
560}
561
562MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
563MODULE_DESCRIPTION("Intel Core temperature monitor");
564MODULE_LICENSE("GPL");
565
566module_init(coretemp_init)
567module_exit(coretemp_exit)