Commit | Line | Data |
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bebe4678 RM |
1 | /* |
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> | |
1fe63ab4 | 36 | #include <linux/pci.h> |
bebe4678 RM |
37 | #include <asm/msr.h> |
38 | #include <asm/processor.h> | |
39 | ||
40 | #define DRVNAME "coretemp" | |
41 | ||
6369a288 RM |
42 | typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, |
43 | SHOW_NAME } SHOW; | |
bebe4678 RM |
44 | |
45 | /* | |
46 | * Functions declaration | |
47 | */ | |
48 | ||
49 | static struct coretemp_data *coretemp_update_device(struct device *dev); | |
50 | ||
51 | struct coretemp_data { | |
1beeffe4 | 52 | struct device *hwmon_dev; |
bebe4678 RM |
53 | struct mutex update_lock; |
54 | const char *name; | |
55 | u32 id; | |
3f4f09b4 | 56 | u16 core_id; |
bebe4678 RM |
57 | char valid; /* zero until following fields are valid */ |
58 | unsigned long last_updated; /* in jiffies */ | |
59 | int temp; | |
60 | int tjmax; | |
6369a288 | 61 | int ttarget; |
bebe4678 RM |
62 | u8 alarm; |
63 | }; | |
64 | ||
bebe4678 RM |
65 | /* |
66 | * Sysfs stuff | |
67 | */ | |
68 | ||
69 | static ssize_t show_name(struct device *dev, struct device_attribute | |
70 | *devattr, char *buf) | |
71 | { | |
72 | int ret; | |
73 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
74 | struct coretemp_data *data = dev_get_drvdata(dev); | |
75 | ||
76 | if (attr->index == SHOW_NAME) | |
77 | ret = sprintf(buf, "%s\n", data->name); | |
78 | else /* show label */ | |
3f4f09b4 | 79 | ret = sprintf(buf, "Core %d\n", data->core_id); |
bebe4678 RM |
80 | return ret; |
81 | } | |
82 | ||
83 | static ssize_t show_alarm(struct device *dev, struct device_attribute | |
84 | *devattr, char *buf) | |
85 | { | |
86 | struct coretemp_data *data = coretemp_update_device(dev); | |
87 | /* read the Out-of-spec log, never clear */ | |
88 | return sprintf(buf, "%d\n", data->alarm); | |
89 | } | |
90 | ||
91 | static ssize_t show_temp(struct device *dev, | |
92 | struct device_attribute *devattr, char *buf) | |
93 | { | |
94 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
95 | struct coretemp_data *data = coretemp_update_device(dev); | |
96 | int err; | |
97 | ||
98 | if (attr->index == SHOW_TEMP) | |
99 | err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN; | |
6369a288 | 100 | else if (attr->index == SHOW_TJMAX) |
bebe4678 | 101 | err = sprintf(buf, "%d\n", data->tjmax); |
6369a288 RM |
102 | else |
103 | err = sprintf(buf, "%d\n", data->ttarget); | |
bebe4678 RM |
104 | return err; |
105 | } | |
106 | ||
107 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, | |
108 | SHOW_TEMP); | |
109 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, | |
110 | SHOW_TJMAX); | |
6369a288 RM |
111 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, |
112 | SHOW_TTARGET); | |
bebe4678 RM |
113 | static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL); |
114 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
115 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
116 | ||
117 | static struct attribute *coretemp_attributes[] = { | |
118 | &sensor_dev_attr_name.dev_attr.attr, | |
119 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
120 | &dev_attr_temp1_crit_alarm.attr, | |
121 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
122 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
123 | NULL | |
124 | }; | |
125 | ||
126 | static const struct attribute_group coretemp_group = { | |
127 | .attrs = coretemp_attributes, | |
128 | }; | |
129 | ||
130 | static struct coretemp_data *coretemp_update_device(struct device *dev) | |
131 | { | |
132 | struct coretemp_data *data = dev_get_drvdata(dev); | |
133 | ||
134 | mutex_lock(&data->update_lock); | |
135 | ||
136 | if (!data->valid || time_after(jiffies, data->last_updated + HZ)) { | |
137 | u32 eax, edx; | |
138 | ||
139 | data->valid = 0; | |
140 | rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); | |
141 | data->alarm = (eax >> 5) & 1; | |
142 | /* update only if data has been valid */ | |
143 | if (eax & 0x80000000) { | |
144 | data->temp = data->tjmax - (((eax >> 16) | |
145 | & 0x7f) * 1000); | |
146 | data->valid = 1; | |
147 | } else { | |
148 | dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax); | |
149 | } | |
150 | data->last_updated = jiffies; | |
151 | } | |
152 | ||
153 | mutex_unlock(&data->update_lock); | |
154 | return data; | |
155 | } | |
156 | ||
118a8871 RM |
157 | static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) |
158 | { | |
159 | /* The 100C is default for both mobile and non mobile CPUs */ | |
160 | ||
161 | int tjmax = 100000; | |
eccfed42 | 162 | int tjmax_ee = 85000; |
708a62bc | 163 | int usemsr_ee = 1; |
118a8871 RM |
164 | int err; |
165 | u32 eax, edx; | |
1fe63ab4 | 166 | struct pci_dev *host_bridge; |
118a8871 RM |
167 | |
168 | /* Early chips have no MSR for TjMax */ | |
169 | ||
170 | if ((c->x86_model == 0xf) && (c->x86_mask < 4)) { | |
708a62bc | 171 | usemsr_ee = 0; |
118a8871 RM |
172 | } |
173 | ||
1fe63ab4 | 174 | /* Atom CPUs */ |
708a62bc RM |
175 | |
176 | if (c->x86_model == 0x1c) { | |
177 | usemsr_ee = 0; | |
1fe63ab4 YW |
178 | |
179 | host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0)); | |
180 | ||
181 | if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL | |
182 | && (host_bridge->device == 0xa000 /* NM10 based nettop */ | |
183 | || host_bridge->device == 0xa010)) /* NM10 based netbook */ | |
184 | tjmax = 100000; | |
185 | else | |
186 | tjmax = 90000; | |
187 | ||
188 | pci_dev_put(host_bridge); | |
708a62bc RM |
189 | } |
190 | ||
191 | if ((c->x86_model > 0xe) && (usemsr_ee)) { | |
eccfed42 | 192 | u8 platform_id; |
118a8871 RM |
193 | |
194 | /* Now we can detect the mobile CPU using Intel provided table | |
195 | http://softwarecommunity.intel.com/Wiki/Mobility/720.htm | |
196 | For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU | |
197 | */ | |
198 | ||
199 | err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx); | |
200 | if (err) { | |
201 | dev_warn(dev, | |
202 | "Unable to access MSR 0x17, assuming desktop" | |
203 | " CPU\n"); | |
708a62bc | 204 | usemsr_ee = 0; |
eccfed42 RM |
205 | } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) { |
206 | /* Trust bit 28 up to Penryn, I could not find any | |
207 | documentation on that; if you happen to know | |
208 | someone at Intel please ask */ | |
708a62bc | 209 | usemsr_ee = 0; |
eccfed42 RM |
210 | } else { |
211 | /* Platform ID bits 52:50 (EDX starts at bit 32) */ | |
212 | platform_id = (edx >> 18) & 0x7; | |
213 | ||
214 | /* Mobile Penryn CPU seems to be platform ID 7 or 5 | |
215 | (guesswork) */ | |
216 | if ((c->x86_model == 0x17) && | |
217 | ((platform_id == 5) || (platform_id == 7))) { | |
218 | /* If MSR EE bit is set, set it to 90 degrees C, | |
219 | otherwise 105 degrees C */ | |
220 | tjmax_ee = 90000; | |
221 | tjmax = 105000; | |
222 | } | |
118a8871 RM |
223 | } |
224 | } | |
225 | ||
708a62bc | 226 | if (usemsr_ee) { |
118a8871 RM |
227 | |
228 | err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx); | |
229 | if (err) { | |
230 | dev_warn(dev, | |
231 | "Unable to access MSR 0xEE, for Tjmax, left" | |
4d7a5644 | 232 | " at default\n"); |
118a8871 | 233 | } else if (eax & 0x40000000) { |
eccfed42 | 234 | tjmax = tjmax_ee; |
118a8871 | 235 | } |
708a62bc RM |
236 | /* if we dont use msr EE it means we are desktop CPU (with exeception |
237 | of Atom) */ | |
238 | } else if (tjmax == 100000) { | |
118a8871 RM |
239 | dev_warn(dev, "Using relative temperature scale!\n"); |
240 | } | |
241 | ||
242 | return tjmax; | |
243 | } | |
244 | ||
a321cedb CE |
245 | static int __devinit get_tjmax(struct cpuinfo_x86 *c, u32 id, |
246 | struct device *dev) | |
247 | { | |
248 | /* The 100C is default for both mobile and non mobile CPUs */ | |
249 | int err; | |
250 | u32 eax, edx; | |
251 | u32 val; | |
252 | ||
253 | /* A new feature of current Intel(R) processors, the | |
254 | IA32_TEMPERATURE_TARGET contains the TjMax value */ | |
255 | err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); | |
256 | if (err) { | |
257 | dev_warn(dev, "Unable to read TjMax from CPU.\n"); | |
258 | } else { | |
259 | val = (eax >> 16) & 0xff; | |
260 | /* | |
261 | * If the TjMax is not plausible, an assumption | |
262 | * will be used | |
263 | */ | |
264 | if ((val > 80) && (val < 120)) { | |
265 | dev_info(dev, "TjMax is %d C.\n", val); | |
266 | return val * 1000; | |
267 | } | |
268 | } | |
269 | ||
270 | /* | |
271 | * An assumption is made for early CPUs and unreadable MSR. | |
272 | * NOTE: the given value may not be correct. | |
273 | */ | |
274 | ||
275 | switch (c->x86_model) { | |
276 | case 0xe: | |
277 | case 0xf: | |
278 | case 0x16: | |
279 | case 0x1a: | |
280 | dev_warn(dev, "TjMax is assumed as 100 C!\n"); | |
281 | return 100000; | |
282 | break; | |
283 | case 0x17: | |
284 | case 0x1c: /* Atom CPUs */ | |
285 | return adjust_tjmax(c, id, dev); | |
286 | break; | |
287 | default: | |
288 | dev_warn(dev, "CPU (model=0x%x) is not supported yet," | |
289 | " using default TjMax of 100C.\n", c->x86_model); | |
290 | return 100000; | |
291 | } | |
292 | } | |
293 | ||
bebe4678 RM |
294 | static int __devinit coretemp_probe(struct platform_device *pdev) |
295 | { | |
296 | struct coretemp_data *data; | |
92cb7612 | 297 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); |
bebe4678 RM |
298 | int err; |
299 | u32 eax, edx; | |
300 | ||
301 | if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) { | |
302 | err = -ENOMEM; | |
303 | dev_err(&pdev->dev, "Out of memory\n"); | |
304 | goto exit; | |
305 | } | |
306 | ||
307 | data->id = pdev->id; | |
3f4f09b4 JD |
308 | #ifdef CONFIG_SMP |
309 | data->core_id = c->cpu_core_id; | |
310 | #endif | |
bebe4678 RM |
311 | data->name = "coretemp"; |
312 | mutex_init(&data->update_lock); | |
bebe4678 RM |
313 | |
314 | /* test if we can access the THERM_STATUS MSR */ | |
315 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); | |
316 | if (err) { | |
317 | dev_err(&pdev->dev, | |
318 | "Unable to access THERM_STATUS MSR, giving up\n"); | |
319 | goto exit_free; | |
320 | } | |
321 | ||
67f363b1 RM |
322 | /* Check if we have problem with errata AE18 of Core processors: |
323 | Readings might stop update when processor visited too deep sleep, | |
324 | fixed for stepping D0 (6EC). | |
325 | */ | |
326 | ||
327 | if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) { | |
328 | /* check for microcode update */ | |
329 | rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx); | |
330 | if (edx < 0x39) { | |
6d79af70 | 331 | err = -ENODEV; |
67f363b1 RM |
332 | dev_err(&pdev->dev, |
333 | "Errata AE18 not fixed, update BIOS or " | |
334 | "microcode of the CPU!\n"); | |
335 | goto exit_free; | |
336 | } | |
337 | } | |
338 | ||
a321cedb | 339 | data->tjmax = get_tjmax(c, data->id, &pdev->dev); |
bebe4678 RM |
340 | platform_set_drvdata(pdev, data); |
341 | ||
a321cedb CE |
342 | /* |
343 | * read the still undocumented IA32_TEMPERATURE_TARGET. It exists | |
344 | * on older CPUs but not in this register, | |
345 | * Atoms don't have it either. | |
346 | */ | |
6369a288 | 347 | |
708a62bc | 348 | if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) { |
a321cedb CE |
349 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_TEMPERATURE_TARGET, |
350 | &eax, &edx); | |
6369a288 RM |
351 | if (err) { |
352 | dev_warn(&pdev->dev, "Unable to read" | |
353 | " IA32_TEMPERATURE_TARGET MSR\n"); | |
354 | } else { | |
355 | data->ttarget = data->tjmax - | |
356 | (((eax >> 8) & 0xff) * 1000); | |
357 | err = device_create_file(&pdev->dev, | |
358 | &sensor_dev_attr_temp1_max.dev_attr); | |
359 | if (err) | |
360 | goto exit_free; | |
361 | } | |
362 | } | |
363 | ||
bebe4678 | 364 | if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group))) |
6369a288 | 365 | goto exit_dev; |
bebe4678 | 366 | |
1beeffe4 TJ |
367 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
368 | if (IS_ERR(data->hwmon_dev)) { | |
369 | err = PTR_ERR(data->hwmon_dev); | |
bebe4678 RM |
370 | dev_err(&pdev->dev, "Class registration failed (%d)\n", |
371 | err); | |
372 | goto exit_class; | |
373 | } | |
374 | ||
375 | return 0; | |
376 | ||
377 | exit_class: | |
378 | sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); | |
6369a288 RM |
379 | exit_dev: |
380 | device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); | |
bebe4678 RM |
381 | exit_free: |
382 | kfree(data); | |
383 | exit: | |
384 | return err; | |
385 | } | |
386 | ||
387 | static int __devexit coretemp_remove(struct platform_device *pdev) | |
388 | { | |
389 | struct coretemp_data *data = platform_get_drvdata(pdev); | |
390 | ||
1beeffe4 | 391 | hwmon_device_unregister(data->hwmon_dev); |
bebe4678 | 392 | sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); |
6369a288 | 393 | device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); |
bebe4678 RM |
394 | platform_set_drvdata(pdev, NULL); |
395 | kfree(data); | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static struct platform_driver coretemp_driver = { | |
400 | .driver = { | |
401 | .owner = THIS_MODULE, | |
402 | .name = DRVNAME, | |
403 | }, | |
404 | .probe = coretemp_probe, | |
405 | .remove = __devexit_p(coretemp_remove), | |
406 | }; | |
407 | ||
408 | struct pdev_entry { | |
409 | struct list_head list; | |
410 | struct platform_device *pdev; | |
411 | unsigned int cpu; | |
d883b9f0 JD |
412 | #ifdef CONFIG_SMP |
413 | u16 phys_proc_id; | |
414 | u16 cpu_core_id; | |
415 | #endif | |
bebe4678 RM |
416 | }; |
417 | ||
418 | static LIST_HEAD(pdev_list); | |
419 | static DEFINE_MUTEX(pdev_list_mutex); | |
420 | ||
421 | static int __cpuinit coretemp_device_add(unsigned int cpu) | |
422 | { | |
423 | int err; | |
424 | struct platform_device *pdev; | |
425 | struct pdev_entry *pdev_entry; | |
d883b9f0 JD |
426 | #ifdef CONFIG_SMP |
427 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
428 | #endif | |
429 | ||
430 | mutex_lock(&pdev_list_mutex); | |
431 | ||
432 | #ifdef CONFIG_SMP | |
433 | /* Skip second HT entry of each core */ | |
434 | list_for_each_entry(pdev_entry, &pdev_list, list) { | |
435 | if (c->phys_proc_id == pdev_entry->phys_proc_id && | |
436 | c->cpu_core_id == pdev_entry->cpu_core_id) { | |
437 | err = 0; /* Not an error */ | |
438 | goto exit; | |
439 | } | |
440 | } | |
441 | #endif | |
bebe4678 RM |
442 | |
443 | pdev = platform_device_alloc(DRVNAME, cpu); | |
444 | if (!pdev) { | |
445 | err = -ENOMEM; | |
446 | printk(KERN_ERR DRVNAME ": Device allocation failed\n"); | |
447 | goto exit; | |
448 | } | |
449 | ||
450 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
451 | if (!pdev_entry) { | |
452 | err = -ENOMEM; | |
453 | goto exit_device_put; | |
454 | } | |
455 | ||
456 | err = platform_device_add(pdev); | |
457 | if (err) { | |
458 | printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", | |
459 | err); | |
460 | goto exit_device_free; | |
461 | } | |
462 | ||
463 | pdev_entry->pdev = pdev; | |
464 | pdev_entry->cpu = cpu; | |
d883b9f0 JD |
465 | #ifdef CONFIG_SMP |
466 | pdev_entry->phys_proc_id = c->phys_proc_id; | |
467 | pdev_entry->cpu_core_id = c->cpu_core_id; | |
468 | #endif | |
bebe4678 RM |
469 | list_add_tail(&pdev_entry->list, &pdev_list); |
470 | mutex_unlock(&pdev_list_mutex); | |
471 | ||
472 | return 0; | |
473 | ||
474 | exit_device_free: | |
475 | kfree(pdev_entry); | |
476 | exit_device_put: | |
477 | platform_device_put(pdev); | |
478 | exit: | |
d883b9f0 | 479 | mutex_unlock(&pdev_list_mutex); |
bebe4678 RM |
480 | return err; |
481 | } | |
482 | ||
d2bc7b13 | 483 | static void coretemp_device_remove(unsigned int cpu) |
bebe4678 RM |
484 | { |
485 | struct pdev_entry *p, *n; | |
486 | mutex_lock(&pdev_list_mutex); | |
487 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
488 | if (p->cpu == cpu) { | |
489 | platform_device_unregister(p->pdev); | |
490 | list_del(&p->list); | |
491 | kfree(p); | |
492 | } | |
493 | } | |
494 | mutex_unlock(&pdev_list_mutex); | |
495 | } | |
496 | ||
ba7c1927 | 497 | static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, |
bebe4678 RM |
498 | unsigned long action, void *hcpu) |
499 | { | |
500 | unsigned int cpu = (unsigned long) hcpu; | |
501 | ||
502 | switch (action) { | |
503 | case CPU_ONLINE: | |
561d9a96 | 504 | case CPU_DOWN_FAILED: |
bebe4678 RM |
505 | coretemp_device_add(cpu); |
506 | break; | |
561d9a96 | 507 | case CPU_DOWN_PREPARE: |
bebe4678 RM |
508 | coretemp_device_remove(cpu); |
509 | break; | |
510 | } | |
511 | return NOTIFY_OK; | |
512 | } | |
513 | ||
ba7c1927 | 514 | static struct notifier_block coretemp_cpu_notifier __refdata = { |
bebe4678 RM |
515 | .notifier_call = coretemp_cpu_callback, |
516 | }; | |
bebe4678 RM |
517 | |
518 | static int __init coretemp_init(void) | |
519 | { | |
520 | int i, err = -ENODEV; | |
bebe4678 | 521 | |
bebe4678 | 522 | /* quick check if we run Intel */ |
92cb7612 | 523 | if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL) |
bebe4678 RM |
524 | goto exit; |
525 | ||
526 | err = platform_driver_register(&coretemp_driver); | |
527 | if (err) | |
528 | goto exit; | |
529 | ||
530 | for_each_online_cpu(i) { | |
92cb7612 | 531 | struct cpuinfo_x86 *c = &cpu_data(i); |
5db47b00 CE |
532 | /* |
533 | * CPUID.06H.EAX[0] indicates whether the CPU has thermal | |
534 | * sensors. We check this bit only, all the early CPUs | |
535 | * without thermal sensors will be filtered out. | |
536 | */ | |
851b29cb CG |
537 | if (c->cpuid_level >= 6 && (cpuid_eax(0x06) & 0x01)) |
538 | coretemp_device_add(i); | |
539 | else { | |
5db47b00 CE |
540 | printk(KERN_INFO DRVNAME ": CPU (model=0x%x)" |
541 | " has no thermal sensor.\n", c->x86_model); | |
bebe4678 | 542 | } |
bebe4678 RM |
543 | } |
544 | if (list_empty(&pdev_list)) { | |
545 | err = -ENODEV; | |
546 | goto exit_driver_unreg; | |
547 | } | |
548 | ||
bebe4678 | 549 | register_hotcpu_notifier(&coretemp_cpu_notifier); |
bebe4678 RM |
550 | return 0; |
551 | ||
bebe4678 | 552 | exit_driver_unreg: |
0dca94ba | 553 | #ifndef CONFIG_HOTPLUG_CPU |
bebe4678 | 554 | platform_driver_unregister(&coretemp_driver); |
0dca94ba | 555 | #endif |
bebe4678 RM |
556 | exit: |
557 | return err; | |
558 | } | |
559 | ||
560 | static void __exit coretemp_exit(void) | |
561 | { | |
562 | struct pdev_entry *p, *n; | |
563 | #ifdef CONFIG_HOTPLUG_CPU | |
564 | unregister_hotcpu_notifier(&coretemp_cpu_notifier); | |
565 | #endif | |
566 | mutex_lock(&pdev_list_mutex); | |
567 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
568 | platform_device_unregister(p->pdev); | |
569 | list_del(&p->list); | |
570 | kfree(p); | |
571 | } | |
572 | mutex_unlock(&pdev_list_mutex); | |
573 | platform_driver_unregister(&coretemp_driver); | |
574 | } | |
575 | ||
576 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); | |
577 | MODULE_DESCRIPTION("Intel Core temperature monitor"); | |
578 | MODULE_LICENSE("GPL"); | |
579 | ||
580 | module_init(coretemp_init) | |
581 | module_exit(coretemp_exit) |