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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
41typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL,
42 SHOW_NAME } SHOW;
43
44
45
46
47
48static struct coretemp_data *coretemp_update_device(struct device *dev);
49
50struct coretemp_data {
51 struct device *hwmon_dev;
52 struct mutex update_lock;
53 const char *name;
54 u32 id;
55 char valid;
56 unsigned long last_updated;
57 int temp;
58 int tjmax;
59 int ttarget;
60 u8 alarm;
61};
62
63
64
65
66
67static 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
77 ret = sprintf(buf, "Core %d\n", data->id);
78 return ret;
79}
80
81static 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
86 return sprintf(buf, "%d\n", data->alarm);
87}
88
89static 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;
98 else if (attr->index == SHOW_TJMAX)
99 err = sprintf(buf, "%d\n", data->tjmax);
100 else
101 err = sprintf(buf, "%d\n", data->ttarget);
102 return err;
103}
104
105static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
106 SHOW_TEMP);
107static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL,
108 SHOW_TJMAX);
109static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL,
110 SHOW_TTARGET);
111static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
112static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
113static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
114
115static 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
124static const struct attribute_group coretemp_group = {
125 .attrs = coretemp_attributes,
126};
127
128static 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
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
155static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
156{
157
158
159 int tjmax = 100000;
160 int tjmax_ee = 85000;
161 int usemsr_ee = 1;
162 int err;
163 u32 eax, edx;
164
165
166
167 if ((c->x86_model == 0xf) && (c->x86_mask < 4)) {
168 usemsr_ee = 0;
169 }
170
171
172
173 if (c->x86_model == 0x1c) {
174 usemsr_ee = 0;
175 tjmax = 90000;
176 }
177
178 if ((c->x86_model > 0xe) && (usemsr_ee)) {
179 u8 platform_id;
180
181
182
183
184
185
186 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
187 if (err) {
188 dev_warn(dev,
189 "Unable to access MSR 0x17, assuming desktop"
190 " CPU\n");
191 usemsr_ee = 0;
192 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
193
194
195
196 usemsr_ee = 0;
197 } else {
198
199 platform_id = (edx >> 18) & 0x7;
200
201
202
203 if ((c->x86_model == 0x17) &&
204 ((platform_id == 5) || (platform_id == 7))) {
205
206
207 tjmax_ee = 90000;
208 tjmax = 105000;
209 }
210 }
211 }
212
213 if (usemsr_ee) {
214
215 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
216 if (err) {
217 dev_warn(dev,
218 "Unable to access MSR 0xEE, for Tjmax, left"
219 " at default");
220 } else if (eax & 0x40000000) {
221 tjmax = tjmax_ee;
222 }
223
224
225 } else if (tjmax == 100000) {
226 dev_warn(dev, "Using relative temperature scale!\n");
227 }
228
229 return tjmax;
230}
231
232static int __devinit coretemp_probe(struct platform_device *pdev)
233{
234 struct coretemp_data *data;
235 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
236 int err;
237 u32 eax, edx;
238
239 if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) {
240 err = -ENOMEM;
241 dev_err(&pdev->dev, "Out of memory\n");
242 goto exit;
243 }
244
245 data->id = pdev->id;
246 data->name = "coretemp";
247 mutex_init(&data->update_lock);
248
249
250 err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
251 if (err) {
252 dev_err(&pdev->dev,
253 "Unable to access THERM_STATUS MSR, giving up\n");
254 goto exit_free;
255 }
256
257
258
259
260
261
262 if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) {
263
264 rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx);
265 if (edx < 0x39) {
266 err = -ENODEV;
267 dev_err(&pdev->dev,
268 "Errata AE18 not fixed, update BIOS or "
269 "microcode of the CPU!\n");
270 goto exit_free;
271 }
272 }
273
274 data->tjmax = adjust_tjmax(c, data->id, &pdev->dev);
275 platform_set_drvdata(pdev, data);
276
277
278
279
280 if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) {
281 err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx);
282 if (err) {
283 dev_warn(&pdev->dev, "Unable to read"
284 " IA32_TEMPERATURE_TARGET MSR\n");
285 } else {
286 data->ttarget = data->tjmax -
287 (((eax >> 8) & 0xff) * 1000);
288 err = device_create_file(&pdev->dev,
289 &sensor_dev_attr_temp1_max.dev_attr);
290 if (err)
291 goto exit_free;
292 }
293 }
294
295 if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
296 goto exit_dev;
297
298 data->hwmon_dev = hwmon_device_register(&pdev->dev);
299 if (IS_ERR(data->hwmon_dev)) {
300 err = PTR_ERR(data->hwmon_dev);
301 dev_err(&pdev->dev, "Class registration failed (%d)\n",
302 err);
303 goto exit_class;
304 }
305
306 return 0;
307
308exit_class:
309 sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
310exit_dev:
311 device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
312exit_free:
313 kfree(data);
314exit:
315 return err;
316}
317
318static int __devexit coretemp_remove(struct platform_device *pdev)
319{
320 struct coretemp_data *data = platform_get_drvdata(pdev);
321
322 hwmon_device_unregister(data->hwmon_dev);
323 sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
324 device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
325 platform_set_drvdata(pdev, NULL);
326 kfree(data);
327 return 0;
328}
329
330static struct platform_driver coretemp_driver = {
331 .driver = {
332 .owner = THIS_MODULE,
333 .name = DRVNAME,
334 },
335 .probe = coretemp_probe,
336 .remove = __devexit_p(coretemp_remove),
337};
338
339struct pdev_entry {
340 struct list_head list;
341 struct platform_device *pdev;
342 unsigned int cpu;
343};
344
345static LIST_HEAD(pdev_list);
346static DEFINE_MUTEX(pdev_list_mutex);
347
348static int __cpuinit coretemp_device_add(unsigned int cpu)
349{
350 int err;
351 struct platform_device *pdev;
352 struct pdev_entry *pdev_entry;
353
354 pdev = platform_device_alloc(DRVNAME, cpu);
355 if (!pdev) {
356 err = -ENOMEM;
357 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
358 goto exit;
359 }
360
361 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
362 if (!pdev_entry) {
363 err = -ENOMEM;
364 goto exit_device_put;
365 }
366
367 err = platform_device_add(pdev);
368 if (err) {
369 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
370 err);
371 goto exit_device_free;
372 }
373
374 pdev_entry->pdev = pdev;
375 pdev_entry->cpu = cpu;
376 mutex_lock(&pdev_list_mutex);
377 list_add_tail(&pdev_entry->list, &pdev_list);
378 mutex_unlock(&pdev_list_mutex);
379
380 return 0;
381
382exit_device_free:
383 kfree(pdev_entry);
384exit_device_put:
385 platform_device_put(pdev);
386exit:
387 return err;
388}
389
390#ifdef CONFIG_HOTPLUG_CPU
391static void coretemp_device_remove(unsigned int cpu)
392{
393 struct pdev_entry *p, *n;
394 mutex_lock(&pdev_list_mutex);
395 list_for_each_entry_safe(p, n, &pdev_list, list) {
396 if (p->cpu == cpu) {
397 platform_device_unregister(p->pdev);
398 list_del(&p->list);
399 kfree(p);
400 }
401 }
402 mutex_unlock(&pdev_list_mutex);
403}
404
405static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb,
406 unsigned long action, void *hcpu)
407{
408 unsigned int cpu = (unsigned long) hcpu;
409
410 switch (action) {
411 case CPU_ONLINE:
412 case CPU_DOWN_FAILED:
413 coretemp_device_add(cpu);
414 break;
415 case CPU_DOWN_PREPARE:
416 coretemp_device_remove(cpu);
417 break;
418 }
419 return NOTIFY_OK;
420}
421
422static struct notifier_block coretemp_cpu_notifier __refdata = {
423 .notifier_call = coretemp_cpu_callback,
424};
425#endif
426
427static int __init coretemp_init(void)
428{
429 int i, err = -ENODEV;
430 struct pdev_entry *p, *n;
431
432
433 if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
434 goto exit;
435
436 err = platform_driver_register(&coretemp_driver);
437 if (err)
438 goto exit;
439
440 for_each_online_cpu(i) {
441 struct cpuinfo_x86 *c = &cpu_data(i);
442
443
444
445
446
447 if ((c->cpuid_level < 0) || (c->x86 != 0x6) ||
448 !((c->x86_model == 0xe) || (c->x86_model == 0xf) ||
449 (c->x86_model == 0x16) || (c->x86_model == 0x17) ||
450 (c->x86_model == 0x1a) || (c->x86_model == 0x1c) ||
451 (c->x86_model == 0x1e))) {
452
453
454
455 if ((c->x86 == 0x6) && (c->x86_model > 0xf))
456 printk(KERN_WARNING DRVNAME ": Unknown CPU "
457 "model %x\n", c->x86_model);
458 continue;
459 }
460
461 err = coretemp_device_add(i);
462 if (err)
463 goto exit_devices_unreg;
464 }
465 if (list_empty(&pdev_list)) {
466 err = -ENODEV;
467 goto exit_driver_unreg;
468 }
469
470#ifdef CONFIG_HOTPLUG_CPU
471 register_hotcpu_notifier(&coretemp_cpu_notifier);
472#endif
473 return 0;
474
475exit_devices_unreg:
476 mutex_lock(&pdev_list_mutex);
477 list_for_each_entry_safe(p, n, &pdev_list, list) {
478 platform_device_unregister(p->pdev);
479 list_del(&p->list);
480 kfree(p);
481 }
482 mutex_unlock(&pdev_list_mutex);
483exit_driver_unreg:
484 platform_driver_unregister(&coretemp_driver);
485exit:
486 return err;
487}
488
489static void __exit coretemp_exit(void)
490{
491 struct pdev_entry *p, *n;
492#ifdef CONFIG_HOTPLUG_CPU
493 unregister_hotcpu_notifier(&coretemp_cpu_notifier);
494#endif
495 mutex_lock(&pdev_list_mutex);
496 list_for_each_entry_safe(p, n, &pdev_list, list) {
497 platform_device_unregister(p->pdev);
498 list_del(&p->list);
499 kfree(p);
500 }
501 mutex_unlock(&pdev_list_mutex);
502 platform_driver_unregister(&coretemp_driver);
503}
504
505MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
506MODULE_DESCRIPTION("Intel Core temperature monitor");
507MODULE_LICENSE("GPL");
508
509module_init(coretemp_init)
510module_exit(coretemp_exit)
511
