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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> | |
36 | #include <asm/msr.h> | |
37 | #include <asm/processor.h> | |
38 | ||
39 | #define DRVNAME "coretemp" | |
40 | ||
6369a288 RM |
41 | typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, |
42 | SHOW_NAME } SHOW; | |
bebe4678 RM |
43 | |
44 | /* | |
45 | * Functions declaration | |
46 | */ | |
47 | ||
48 | static struct coretemp_data *coretemp_update_device(struct device *dev); | |
49 | ||
50 | struct coretemp_data { | |
1beeffe4 | 51 | struct device *hwmon_dev; |
bebe4678 RM |
52 | struct mutex update_lock; |
53 | const char *name; | |
54 | u32 id; | |
55 | char valid; /* zero until following fields are valid */ | |
56 | unsigned long last_updated; /* in jiffies */ | |
57 | int temp; | |
58 | int tjmax; | |
6369a288 | 59 | int ttarget; |
bebe4678 RM |
60 | u8 alarm; |
61 | }; | |
62 | ||
bebe4678 RM |
63 | /* |
64 | * Sysfs stuff | |
65 | */ | |
66 | ||
67 | static ssize_t show_name(struct device *dev, struct device_attribute | |
68 | *devattr, char *buf) | |
69 | { | |
70 | int ret; | |
71 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
72 | struct coretemp_data *data = dev_get_drvdata(dev); | |
73 | ||
74 | if (attr->index == SHOW_NAME) | |
75 | ret = sprintf(buf, "%s\n", data->name); | |
76 | else /* show label */ | |
77 | ret = sprintf(buf, "Core %d\n", data->id); | |
78 | return ret; | |
79 | } | |
80 | ||
81 | static ssize_t show_alarm(struct device *dev, struct device_attribute | |
82 | *devattr, char *buf) | |
83 | { | |
84 | struct coretemp_data *data = coretemp_update_device(dev); | |
85 | /* read the Out-of-spec log, never clear */ | |
86 | return sprintf(buf, "%d\n", data->alarm); | |
87 | } | |
88 | ||
89 | static ssize_t show_temp(struct device *dev, | |
90 | struct device_attribute *devattr, char *buf) | |
91 | { | |
92 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
93 | struct coretemp_data *data = coretemp_update_device(dev); | |
94 | int err; | |
95 | ||
96 | if (attr->index == SHOW_TEMP) | |
97 | err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN; | |
6369a288 | 98 | else if (attr->index == SHOW_TJMAX) |
bebe4678 | 99 | err = sprintf(buf, "%d\n", data->tjmax); |
6369a288 RM |
100 | else |
101 | err = sprintf(buf, "%d\n", data->ttarget); | |
bebe4678 RM |
102 | return err; |
103 | } | |
104 | ||
105 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, | |
106 | SHOW_TEMP); | |
107 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, | |
108 | SHOW_TJMAX); | |
6369a288 RM |
109 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, |
110 | SHOW_TTARGET); | |
bebe4678 RM |
111 | static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL); |
112 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
113 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
114 | ||
115 | static struct attribute *coretemp_attributes[] = { | |
116 | &sensor_dev_attr_name.dev_attr.attr, | |
117 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
118 | &dev_attr_temp1_crit_alarm.attr, | |
119 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
120 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
121 | NULL | |
122 | }; | |
123 | ||
124 | static const struct attribute_group coretemp_group = { | |
125 | .attrs = coretemp_attributes, | |
126 | }; | |
127 | ||
128 | static struct coretemp_data *coretemp_update_device(struct device *dev) | |
129 | { | |
130 | struct coretemp_data *data = dev_get_drvdata(dev); | |
131 | ||
132 | mutex_lock(&data->update_lock); | |
133 | ||
134 | if (!data->valid || time_after(jiffies, data->last_updated + HZ)) { | |
135 | u32 eax, edx; | |
136 | ||
137 | data->valid = 0; | |
138 | rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); | |
139 | data->alarm = (eax >> 5) & 1; | |
140 | /* update only if data has been valid */ | |
141 | if (eax & 0x80000000) { | |
142 | data->temp = data->tjmax - (((eax >> 16) | |
143 | & 0x7f) * 1000); | |
144 | data->valid = 1; | |
145 | } else { | |
146 | dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax); | |
147 | } | |
148 | data->last_updated = jiffies; | |
149 | } | |
150 | ||
151 | mutex_unlock(&data->update_lock); | |
152 | return data; | |
153 | } | |
154 | ||
155 | static int __devinit coretemp_probe(struct platform_device *pdev) | |
156 | { | |
157 | struct coretemp_data *data; | |
92cb7612 | 158 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); |
bebe4678 RM |
159 | int err; |
160 | u32 eax, edx; | |
161 | ||
162 | if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) { | |
163 | err = -ENOMEM; | |
164 | dev_err(&pdev->dev, "Out of memory\n"); | |
165 | goto exit; | |
166 | } | |
167 | ||
168 | data->id = pdev->id; | |
169 | data->name = "coretemp"; | |
170 | mutex_init(&data->update_lock); | |
171 | /* Tjmax default is 100 degrees C */ | |
172 | data->tjmax = 100000; | |
173 | ||
174 | /* test if we can access the THERM_STATUS MSR */ | |
175 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); | |
176 | if (err) { | |
177 | dev_err(&pdev->dev, | |
178 | "Unable to access THERM_STATUS MSR, giving up\n"); | |
179 | goto exit_free; | |
180 | } | |
181 | ||
67f363b1 RM |
182 | /* Check if we have problem with errata AE18 of Core processors: |
183 | Readings might stop update when processor visited too deep sleep, | |
184 | fixed for stepping D0 (6EC). | |
185 | */ | |
186 | ||
187 | if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) { | |
188 | /* check for microcode update */ | |
189 | rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx); | |
190 | if (edx < 0x39) { | |
6d79af70 | 191 | err = -ENODEV; |
67f363b1 RM |
192 | dev_err(&pdev->dev, |
193 | "Errata AE18 not fixed, update BIOS or " | |
194 | "microcode of the CPU!\n"); | |
195 | goto exit_free; | |
196 | } | |
197 | } | |
198 | ||
bebe4678 RM |
199 | /* Some processors have Tjmax 85 following magic should detect it |
200 | Intel won't disclose the information without signed NDA, but | |
201 | individuals cannot sign it. Catch(ed) 22. | |
202 | */ | |
203 | ||
204 | if (((c->x86_model == 0xf) && (c->x86_mask > 3)) || | |
205 | (c->x86_model == 0xe)) { | |
206 | err = rdmsr_safe_on_cpu(data->id, 0xee, &eax, &edx); | |
207 | if (err) { | |
208 | dev_warn(&pdev->dev, | |
209 | "Unable to access MSR 0xEE, Tjmax left at %d " | |
210 | "degrees C\n", data->tjmax/1000); | |
211 | } else if (eax & 0x40000000) { | |
212 | data->tjmax = 85000; | |
213 | } | |
214 | } | |
215 | ||
67f363b1 RM |
216 | /* Intel says that above should not work for desktop Core2 processors, |
217 | but it seems to work. There is no other way how get the absolute | |
218 | readings. Warn the user about this. First check if are desktop, | |
219 | bit 50 of MSR_IA32_PLATFORM_ID should be 0. | |
220 | */ | |
221 | ||
222 | rdmsr_safe_on_cpu(data->id, MSR_IA32_PLATFORM_ID, &eax, &edx); | |
223 | ||
224 | if ((c->x86_model == 0xf) && (!(edx & 0x00040000))) { | |
225 | dev_warn(&pdev->dev, "Using undocumented features, absolute " | |
226 | "temperature might be wrong!\n"); | |
227 | } | |
228 | ||
bebe4678 RM |
229 | platform_set_drvdata(pdev, data); |
230 | ||
6369a288 RM |
231 | /* read the still undocumented IA32_TEMPERATURE_TARGET it exists |
232 | on older CPUs but not in this register */ | |
233 | ||
234 | if (c->x86_model > 0xe) { | |
235 | err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx); | |
236 | if (err) { | |
237 | dev_warn(&pdev->dev, "Unable to read" | |
238 | " IA32_TEMPERATURE_TARGET MSR\n"); | |
239 | } else { | |
240 | data->ttarget = data->tjmax - | |
241 | (((eax >> 8) & 0xff) * 1000); | |
242 | err = device_create_file(&pdev->dev, | |
243 | &sensor_dev_attr_temp1_max.dev_attr); | |
244 | if (err) | |
245 | goto exit_free; | |
246 | } | |
247 | } | |
248 | ||
bebe4678 | 249 | if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group))) |
6369a288 | 250 | goto exit_dev; |
bebe4678 | 251 | |
1beeffe4 TJ |
252 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
253 | if (IS_ERR(data->hwmon_dev)) { | |
254 | err = PTR_ERR(data->hwmon_dev); | |
bebe4678 RM |
255 | dev_err(&pdev->dev, "Class registration failed (%d)\n", |
256 | err); | |
257 | goto exit_class; | |
258 | } | |
259 | ||
260 | return 0; | |
261 | ||
262 | exit_class: | |
263 | sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); | |
6369a288 RM |
264 | exit_dev: |
265 | device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); | |
bebe4678 RM |
266 | exit_free: |
267 | kfree(data); | |
268 | exit: | |
269 | return err; | |
270 | } | |
271 | ||
272 | static int __devexit coretemp_remove(struct platform_device *pdev) | |
273 | { | |
274 | struct coretemp_data *data = platform_get_drvdata(pdev); | |
275 | ||
1beeffe4 | 276 | hwmon_device_unregister(data->hwmon_dev); |
bebe4678 | 277 | sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); |
6369a288 | 278 | device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); |
bebe4678 RM |
279 | platform_set_drvdata(pdev, NULL); |
280 | kfree(data); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static struct platform_driver coretemp_driver = { | |
285 | .driver = { | |
286 | .owner = THIS_MODULE, | |
287 | .name = DRVNAME, | |
288 | }, | |
289 | .probe = coretemp_probe, | |
290 | .remove = __devexit_p(coretemp_remove), | |
291 | }; | |
292 | ||
293 | struct pdev_entry { | |
294 | struct list_head list; | |
295 | struct platform_device *pdev; | |
296 | unsigned int cpu; | |
297 | }; | |
298 | ||
299 | static LIST_HEAD(pdev_list); | |
300 | static DEFINE_MUTEX(pdev_list_mutex); | |
301 | ||
302 | static int __cpuinit coretemp_device_add(unsigned int cpu) | |
303 | { | |
304 | int err; | |
305 | struct platform_device *pdev; | |
306 | struct pdev_entry *pdev_entry; | |
307 | ||
308 | pdev = platform_device_alloc(DRVNAME, cpu); | |
309 | if (!pdev) { | |
310 | err = -ENOMEM; | |
311 | printk(KERN_ERR DRVNAME ": Device allocation failed\n"); | |
312 | goto exit; | |
313 | } | |
314 | ||
315 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
316 | if (!pdev_entry) { | |
317 | err = -ENOMEM; | |
318 | goto exit_device_put; | |
319 | } | |
320 | ||
321 | err = platform_device_add(pdev); | |
322 | if (err) { | |
323 | printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", | |
324 | err); | |
325 | goto exit_device_free; | |
326 | } | |
327 | ||
328 | pdev_entry->pdev = pdev; | |
329 | pdev_entry->cpu = cpu; | |
330 | mutex_lock(&pdev_list_mutex); | |
331 | list_add_tail(&pdev_entry->list, &pdev_list); | |
332 | mutex_unlock(&pdev_list_mutex); | |
333 | ||
334 | return 0; | |
335 | ||
336 | exit_device_free: | |
337 | kfree(pdev_entry); | |
338 | exit_device_put: | |
339 | platform_device_put(pdev); | |
340 | exit: | |
341 | return err; | |
342 | } | |
343 | ||
344 | #ifdef CONFIG_HOTPLUG_CPU | |
d2bc7b13 | 345 | static void coretemp_device_remove(unsigned int cpu) |
bebe4678 RM |
346 | { |
347 | struct pdev_entry *p, *n; | |
348 | mutex_lock(&pdev_list_mutex); | |
349 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
350 | if (p->cpu == cpu) { | |
351 | platform_device_unregister(p->pdev); | |
352 | list_del(&p->list); | |
353 | kfree(p); | |
354 | } | |
355 | } | |
356 | mutex_unlock(&pdev_list_mutex); | |
357 | } | |
358 | ||
ba7c1927 | 359 | static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, |
bebe4678 RM |
360 | unsigned long action, void *hcpu) |
361 | { | |
362 | unsigned int cpu = (unsigned long) hcpu; | |
363 | ||
364 | switch (action) { | |
365 | case CPU_ONLINE: | |
561d9a96 | 366 | case CPU_DOWN_FAILED: |
bebe4678 RM |
367 | coretemp_device_add(cpu); |
368 | break; | |
561d9a96 | 369 | case CPU_DOWN_PREPARE: |
bebe4678 RM |
370 | coretemp_device_remove(cpu); |
371 | break; | |
372 | } | |
373 | return NOTIFY_OK; | |
374 | } | |
375 | ||
ba7c1927 | 376 | static struct notifier_block coretemp_cpu_notifier __refdata = { |
bebe4678 RM |
377 | .notifier_call = coretemp_cpu_callback, |
378 | }; | |
379 | #endif /* !CONFIG_HOTPLUG_CPU */ | |
380 | ||
381 | static int __init coretemp_init(void) | |
382 | { | |
383 | int i, err = -ENODEV; | |
384 | struct pdev_entry *p, *n; | |
385 | ||
bebe4678 | 386 | /* quick check if we run Intel */ |
92cb7612 | 387 | if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL) |
bebe4678 RM |
388 | goto exit; |
389 | ||
390 | err = platform_driver_register(&coretemp_driver); | |
391 | if (err) | |
392 | goto exit; | |
393 | ||
394 | for_each_online_cpu(i) { | |
92cb7612 | 395 | struct cpuinfo_x86 *c = &cpu_data(i); |
bebe4678 | 396 | |
c940336b | 397 | /* check if family 6, models e, f, 16 */ |
bebe4678 | 398 | if ((c->cpuid_level < 0) || (c->x86 != 0x6) || |
c940336b RM |
399 | !((c->x86_model == 0xe) || (c->x86_model == 0xf) || |
400 | (c->x86_model == 0x16))) { | |
bebe4678 RM |
401 | |
402 | /* supported CPU not found, but report the unknown | |
403 | family 6 CPU */ | |
404 | if ((c->x86 == 0x6) && (c->x86_model > 0xf)) | |
405 | printk(KERN_WARNING DRVNAME ": Unknown CPU " | |
406 | "model %x\n", c->x86_model); | |
407 | continue; | |
408 | } | |
409 | ||
410 | err = coretemp_device_add(i); | |
411 | if (err) | |
412 | goto exit_devices_unreg; | |
413 | } | |
414 | if (list_empty(&pdev_list)) { | |
415 | err = -ENODEV; | |
416 | goto exit_driver_unreg; | |
417 | } | |
418 | ||
419 | #ifdef CONFIG_HOTPLUG_CPU | |
420 | register_hotcpu_notifier(&coretemp_cpu_notifier); | |
421 | #endif | |
422 | return 0; | |
423 | ||
424 | exit_devices_unreg: | |
425 | mutex_lock(&pdev_list_mutex); | |
426 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
427 | platform_device_unregister(p->pdev); | |
428 | list_del(&p->list); | |
429 | kfree(p); | |
430 | } | |
431 | mutex_unlock(&pdev_list_mutex); | |
432 | exit_driver_unreg: | |
433 | platform_driver_unregister(&coretemp_driver); | |
434 | exit: | |
435 | return err; | |
436 | } | |
437 | ||
438 | static void __exit coretemp_exit(void) | |
439 | { | |
440 | struct pdev_entry *p, *n; | |
441 | #ifdef CONFIG_HOTPLUG_CPU | |
442 | unregister_hotcpu_notifier(&coretemp_cpu_notifier); | |
443 | #endif | |
444 | mutex_lock(&pdev_list_mutex); | |
445 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
446 | platform_device_unregister(p->pdev); | |
447 | list_del(&p->list); | |
448 | kfree(p); | |
449 | } | |
450 | mutex_unlock(&pdev_list_mutex); | |
451 | platform_driver_unregister(&coretemp_driver); | |
452 | } | |
453 | ||
454 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); | |
455 | MODULE_DESCRIPTION("Intel Core temperature monitor"); | |
456 | MODULE_LICENSE("GPL"); | |
457 | ||
458 | module_init(coretemp_init) | |
459 | module_exit(coretemp_exit) |