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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 | ||
41 | typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_LABEL, SHOW_NAME } SHOW; | |
42 | ||
43 | /* | |
44 | * Functions declaration | |
45 | */ | |
46 | ||
47 | static struct coretemp_data *coretemp_update_device(struct device *dev); | |
48 | ||
49 | struct coretemp_data { | |
1beeffe4 | 50 | struct device *hwmon_dev; |
bebe4678 RM |
51 | struct mutex update_lock; |
52 | const char *name; | |
53 | u32 id; | |
54 | char valid; /* zero until following fields are valid */ | |
55 | unsigned long last_updated; /* in jiffies */ | |
56 | int temp; | |
57 | int tjmax; | |
58 | u8 alarm; | |
59 | }; | |
60 | ||
bebe4678 RM |
61 | /* |
62 | * Sysfs stuff | |
63 | */ | |
64 | ||
65 | static ssize_t show_name(struct device *dev, struct device_attribute | |
66 | *devattr, char *buf) | |
67 | { | |
68 | int ret; | |
69 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
70 | struct coretemp_data *data = dev_get_drvdata(dev); | |
71 | ||
72 | if (attr->index == SHOW_NAME) | |
73 | ret = sprintf(buf, "%s\n", data->name); | |
74 | else /* show label */ | |
75 | ret = sprintf(buf, "Core %d\n", data->id); | |
76 | return ret; | |
77 | } | |
78 | ||
79 | static ssize_t show_alarm(struct device *dev, struct device_attribute | |
80 | *devattr, char *buf) | |
81 | { | |
82 | struct coretemp_data *data = coretemp_update_device(dev); | |
83 | /* read the Out-of-spec log, never clear */ | |
84 | return sprintf(buf, "%d\n", data->alarm); | |
85 | } | |
86 | ||
87 | static ssize_t show_temp(struct device *dev, | |
88 | struct device_attribute *devattr, char *buf) | |
89 | { | |
90 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
91 | struct coretemp_data *data = coretemp_update_device(dev); | |
92 | int err; | |
93 | ||
94 | if (attr->index == SHOW_TEMP) | |
95 | err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN; | |
96 | else | |
97 | err = sprintf(buf, "%d\n", data->tjmax); | |
98 | ||
99 | return err; | |
100 | } | |
101 | ||
102 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, | |
103 | SHOW_TEMP); | |
104 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, | |
105 | SHOW_TJMAX); | |
106 | static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL); | |
107 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
108 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
109 | ||
110 | static struct attribute *coretemp_attributes[] = { | |
111 | &sensor_dev_attr_name.dev_attr.attr, | |
112 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
113 | &dev_attr_temp1_crit_alarm.attr, | |
114 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
115 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
116 | NULL | |
117 | }; | |
118 | ||
119 | static const struct attribute_group coretemp_group = { | |
120 | .attrs = coretemp_attributes, | |
121 | }; | |
122 | ||
123 | static struct coretemp_data *coretemp_update_device(struct device *dev) | |
124 | { | |
125 | struct coretemp_data *data = dev_get_drvdata(dev); | |
126 | ||
127 | mutex_lock(&data->update_lock); | |
128 | ||
129 | if (!data->valid || time_after(jiffies, data->last_updated + HZ)) { | |
130 | u32 eax, edx; | |
131 | ||
132 | data->valid = 0; | |
133 | rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); | |
134 | data->alarm = (eax >> 5) & 1; | |
135 | /* update only if data has been valid */ | |
136 | if (eax & 0x80000000) { | |
137 | data->temp = data->tjmax - (((eax >> 16) | |
138 | & 0x7f) * 1000); | |
139 | data->valid = 1; | |
140 | } else { | |
141 | dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax); | |
142 | } | |
143 | data->last_updated = jiffies; | |
144 | } | |
145 | ||
146 | mutex_unlock(&data->update_lock); | |
147 | return data; | |
148 | } | |
149 | ||
150 | static int __devinit coretemp_probe(struct platform_device *pdev) | |
151 | { | |
152 | struct coretemp_data *data; | |
153 | struct cpuinfo_x86 *c = &(cpu_data)[pdev->id]; | |
154 | int err; | |
155 | u32 eax, edx; | |
156 | ||
157 | if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) { | |
158 | err = -ENOMEM; | |
159 | dev_err(&pdev->dev, "Out of memory\n"); | |
160 | goto exit; | |
161 | } | |
162 | ||
163 | data->id = pdev->id; | |
164 | data->name = "coretemp"; | |
165 | mutex_init(&data->update_lock); | |
166 | /* Tjmax default is 100 degrees C */ | |
167 | data->tjmax = 100000; | |
168 | ||
169 | /* test if we can access the THERM_STATUS MSR */ | |
170 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); | |
171 | if (err) { | |
172 | dev_err(&pdev->dev, | |
173 | "Unable to access THERM_STATUS MSR, giving up\n"); | |
174 | goto exit_free; | |
175 | } | |
176 | ||
67f363b1 RM |
177 | /* Check if we have problem with errata AE18 of Core processors: |
178 | Readings might stop update when processor visited too deep sleep, | |
179 | fixed for stepping D0 (6EC). | |
180 | */ | |
181 | ||
182 | if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) { | |
183 | /* check for microcode update */ | |
184 | rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx); | |
185 | if (edx < 0x39) { | |
6d79af70 | 186 | err = -ENODEV; |
67f363b1 RM |
187 | dev_err(&pdev->dev, |
188 | "Errata AE18 not fixed, update BIOS or " | |
189 | "microcode of the CPU!\n"); | |
190 | goto exit_free; | |
191 | } | |
192 | } | |
193 | ||
bebe4678 RM |
194 | /* Some processors have Tjmax 85 following magic should detect it |
195 | Intel won't disclose the information without signed NDA, but | |
196 | individuals cannot sign it. Catch(ed) 22. | |
197 | */ | |
198 | ||
199 | if (((c->x86_model == 0xf) && (c->x86_mask > 3)) || | |
200 | (c->x86_model == 0xe)) { | |
201 | err = rdmsr_safe_on_cpu(data->id, 0xee, &eax, &edx); | |
202 | if (err) { | |
203 | dev_warn(&pdev->dev, | |
204 | "Unable to access MSR 0xEE, Tjmax left at %d " | |
205 | "degrees C\n", data->tjmax/1000); | |
206 | } else if (eax & 0x40000000) { | |
207 | data->tjmax = 85000; | |
208 | } | |
209 | } | |
210 | ||
67f363b1 RM |
211 | /* Intel says that above should not work for desktop Core2 processors, |
212 | but it seems to work. There is no other way how get the absolute | |
213 | readings. Warn the user about this. First check if are desktop, | |
214 | bit 50 of MSR_IA32_PLATFORM_ID should be 0. | |
215 | */ | |
216 | ||
217 | rdmsr_safe_on_cpu(data->id, MSR_IA32_PLATFORM_ID, &eax, &edx); | |
218 | ||
219 | if ((c->x86_model == 0xf) && (!(edx & 0x00040000))) { | |
220 | dev_warn(&pdev->dev, "Using undocumented features, absolute " | |
221 | "temperature might be wrong!\n"); | |
222 | } | |
223 | ||
bebe4678 RM |
224 | platform_set_drvdata(pdev, data); |
225 | ||
226 | if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group))) | |
227 | goto exit_free; | |
228 | ||
1beeffe4 TJ |
229 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
230 | if (IS_ERR(data->hwmon_dev)) { | |
231 | err = PTR_ERR(data->hwmon_dev); | |
bebe4678 RM |
232 | dev_err(&pdev->dev, "Class registration failed (%d)\n", |
233 | err); | |
234 | goto exit_class; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | ||
239 | exit_class: | |
240 | sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); | |
241 | exit_free: | |
242 | kfree(data); | |
243 | exit: | |
244 | return err; | |
245 | } | |
246 | ||
247 | static int __devexit coretemp_remove(struct platform_device *pdev) | |
248 | { | |
249 | struct coretemp_data *data = platform_get_drvdata(pdev); | |
250 | ||
1beeffe4 | 251 | hwmon_device_unregister(data->hwmon_dev); |
bebe4678 RM |
252 | sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); |
253 | platform_set_drvdata(pdev, NULL); | |
254 | kfree(data); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static struct platform_driver coretemp_driver = { | |
259 | .driver = { | |
260 | .owner = THIS_MODULE, | |
261 | .name = DRVNAME, | |
262 | }, | |
263 | .probe = coretemp_probe, | |
264 | .remove = __devexit_p(coretemp_remove), | |
265 | }; | |
266 | ||
267 | struct pdev_entry { | |
268 | struct list_head list; | |
269 | struct platform_device *pdev; | |
270 | unsigned int cpu; | |
271 | }; | |
272 | ||
273 | static LIST_HEAD(pdev_list); | |
274 | static DEFINE_MUTEX(pdev_list_mutex); | |
275 | ||
276 | static int __cpuinit coretemp_device_add(unsigned int cpu) | |
277 | { | |
278 | int err; | |
279 | struct platform_device *pdev; | |
280 | struct pdev_entry *pdev_entry; | |
281 | ||
282 | pdev = platform_device_alloc(DRVNAME, cpu); | |
283 | if (!pdev) { | |
284 | err = -ENOMEM; | |
285 | printk(KERN_ERR DRVNAME ": Device allocation failed\n"); | |
286 | goto exit; | |
287 | } | |
288 | ||
289 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
290 | if (!pdev_entry) { | |
291 | err = -ENOMEM; | |
292 | goto exit_device_put; | |
293 | } | |
294 | ||
295 | err = platform_device_add(pdev); | |
296 | if (err) { | |
297 | printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", | |
298 | err); | |
299 | goto exit_device_free; | |
300 | } | |
301 | ||
302 | pdev_entry->pdev = pdev; | |
303 | pdev_entry->cpu = cpu; | |
304 | mutex_lock(&pdev_list_mutex); | |
305 | list_add_tail(&pdev_entry->list, &pdev_list); | |
306 | mutex_unlock(&pdev_list_mutex); | |
307 | ||
308 | return 0; | |
309 | ||
310 | exit_device_free: | |
311 | kfree(pdev_entry); | |
312 | exit_device_put: | |
313 | platform_device_put(pdev); | |
314 | exit: | |
315 | return err; | |
316 | } | |
317 | ||
318 | #ifdef CONFIG_HOTPLUG_CPU | |
d2bc7b13 | 319 | static void coretemp_device_remove(unsigned int cpu) |
bebe4678 RM |
320 | { |
321 | struct pdev_entry *p, *n; | |
322 | mutex_lock(&pdev_list_mutex); | |
323 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
324 | if (p->cpu == cpu) { | |
325 | platform_device_unregister(p->pdev); | |
326 | list_del(&p->list); | |
327 | kfree(p); | |
328 | } | |
329 | } | |
330 | mutex_unlock(&pdev_list_mutex); | |
331 | } | |
332 | ||
333 | static int coretemp_cpu_callback(struct notifier_block *nfb, | |
334 | unsigned long action, void *hcpu) | |
335 | { | |
336 | unsigned int cpu = (unsigned long) hcpu; | |
337 | ||
338 | switch (action) { | |
339 | case CPU_ONLINE: | |
8bb78442 | 340 | case CPU_ONLINE_FROZEN: |
bebe4678 RM |
341 | coretemp_device_add(cpu); |
342 | break; | |
343 | case CPU_DEAD: | |
8bb78442 | 344 | case CPU_DEAD_FROZEN: |
bebe4678 RM |
345 | coretemp_device_remove(cpu); |
346 | break; | |
347 | } | |
348 | return NOTIFY_OK; | |
349 | } | |
350 | ||
59a35baf | 351 | static struct notifier_block coretemp_cpu_notifier = { |
bebe4678 RM |
352 | .notifier_call = coretemp_cpu_callback, |
353 | }; | |
354 | #endif /* !CONFIG_HOTPLUG_CPU */ | |
355 | ||
356 | static int __init coretemp_init(void) | |
357 | { | |
358 | int i, err = -ENODEV; | |
359 | struct pdev_entry *p, *n; | |
360 | ||
bebe4678 RM |
361 | /* quick check if we run Intel */ |
362 | if (cpu_data[0].x86_vendor != X86_VENDOR_INTEL) | |
363 | goto exit; | |
364 | ||
365 | err = platform_driver_register(&coretemp_driver); | |
366 | if (err) | |
367 | goto exit; | |
368 | ||
369 | for_each_online_cpu(i) { | |
370 | struct cpuinfo_x86 *c = &(cpu_data)[i]; | |
371 | ||
c940336b | 372 | /* check if family 6, models e, f, 16 */ |
bebe4678 | 373 | if ((c->cpuid_level < 0) || (c->x86 != 0x6) || |
c940336b RM |
374 | !((c->x86_model == 0xe) || (c->x86_model == 0xf) || |
375 | (c->x86_model == 0x16))) { | |
bebe4678 RM |
376 | |
377 | /* supported CPU not found, but report the unknown | |
378 | family 6 CPU */ | |
379 | if ((c->x86 == 0x6) && (c->x86_model > 0xf)) | |
380 | printk(KERN_WARNING DRVNAME ": Unknown CPU " | |
381 | "model %x\n", c->x86_model); | |
382 | continue; | |
383 | } | |
384 | ||
385 | err = coretemp_device_add(i); | |
386 | if (err) | |
387 | goto exit_devices_unreg; | |
388 | } | |
389 | if (list_empty(&pdev_list)) { | |
390 | err = -ENODEV; | |
391 | goto exit_driver_unreg; | |
392 | } | |
393 | ||
394 | #ifdef CONFIG_HOTPLUG_CPU | |
395 | register_hotcpu_notifier(&coretemp_cpu_notifier); | |
396 | #endif | |
397 | return 0; | |
398 | ||
399 | exit_devices_unreg: | |
400 | mutex_lock(&pdev_list_mutex); | |
401 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
402 | platform_device_unregister(p->pdev); | |
403 | list_del(&p->list); | |
404 | kfree(p); | |
405 | } | |
406 | mutex_unlock(&pdev_list_mutex); | |
407 | exit_driver_unreg: | |
408 | platform_driver_unregister(&coretemp_driver); | |
409 | exit: | |
410 | return err; | |
411 | } | |
412 | ||
413 | static void __exit coretemp_exit(void) | |
414 | { | |
415 | struct pdev_entry *p, *n; | |
416 | #ifdef CONFIG_HOTPLUG_CPU | |
417 | unregister_hotcpu_notifier(&coretemp_cpu_notifier); | |
418 | #endif | |
419 | mutex_lock(&pdev_list_mutex); | |
420 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
421 | platform_device_unregister(p->pdev); | |
422 | list_del(&p->list); | |
423 | kfree(p); | |
424 | } | |
425 | mutex_unlock(&pdev_list_mutex); | |
426 | platform_driver_unregister(&coretemp_driver); | |
427 | } | |
428 | ||
429 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); | |
430 | MODULE_DESCRIPTION("Intel Core temperature monitor"); | |
431 | MODULE_LICENSE("GPL"); | |
432 | ||
433 | module_init(coretemp_init) | |
434 | module_exit(coretemp_exit) |