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-rw-r--r--drivers/hwmon/coretemp.c406
1 files changed, 406 insertions, 0 deletions
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
new file mode 100644
index 000000000000..03b1f650d1c4
--- /dev/null
+++ b/drivers/hwmon/coretemp.c
@@ -0,0 +1,406 @@
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
41typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_LABEL, SHOW_NAME } SHOW;
42
43/*
44 * Functions declaration
45 */
46
47static struct coretemp_data *coretemp_update_device(struct device *dev);
48
49struct coretemp_data {
50 struct class_device *class_dev;
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
61static struct coretemp_data *coretemp_update_device(struct device *dev);
62
63/*
64 * Sysfs stuff
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 /* show label */
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 /* read the Out-of-spec log, never clear */
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
99 err = sprintf(buf, "%d\n", data->tjmax);
100
101 return err;
102}
103
104static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
105 SHOW_TEMP);
106static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL,
107 SHOW_TJMAX);
108static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
109static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
110static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
111
112static struct attribute *coretemp_attributes[] = {
113 &sensor_dev_attr_name.dev_attr.attr,
114 &sensor_dev_attr_temp1_label.dev_attr.attr,
115 &dev_attr_temp1_crit_alarm.attr,
116 &sensor_dev_attr_temp1_input.dev_attr.attr,
117 &sensor_dev_attr_temp1_crit.dev_attr.attr,
118 NULL
119};
120
121static const struct attribute_group coretemp_group = {
122 .attrs = coretemp_attributes,
123};
124
125static struct coretemp_data *coretemp_update_device(struct device *dev)
126{
127 struct coretemp_data *data = dev_get_drvdata(dev);
128
129 mutex_lock(&data->update_lock);
130
131 if (!data->valid || time_after(jiffies, data->last_updated + HZ)) {
132 u32 eax, edx;
133
134 data->valid = 0;
135 rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
136 data->alarm = (eax >> 5) & 1;
137 /* update only if data has been valid */
138 if (eax & 0x80000000) {
139 data->temp = data->tjmax - (((eax >> 16)
140 & 0x7f) * 1000);
141 data->valid = 1;
142 } else {
143 dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax);
144 }
145 data->last_updated = jiffies;
146 }
147
148 mutex_unlock(&data->update_lock);
149 return data;
150}
151
152static int __devinit coretemp_probe(struct platform_device *pdev)
153{
154 struct coretemp_data *data;
155 struct cpuinfo_x86 *c = &(cpu_data)[pdev->id];
156 int err;
157 u32 eax, edx;
158
159 if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) {
160 err = -ENOMEM;
161 dev_err(&pdev->dev, "Out of memory\n");
162 goto exit;
163 }
164
165 data->id = pdev->id;
166 data->name = "coretemp";
167 mutex_init(&data->update_lock);
168 /* Tjmax default is 100 degrees C */
169 data->tjmax = 100000;
170
171 /* test if we can access the THERM_STATUS MSR */
172 err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
173 if (err) {
174 dev_err(&pdev->dev,
175 "Unable to access THERM_STATUS MSR, giving up\n");
176 goto exit_free;
177 }
178
179 /* Some processors have Tjmax 85 following magic should detect it
180 Intel won't disclose the information without signed NDA, but
181 individuals cannot sign it. Catch(ed) 22.
182 */
183
184 if (((c->x86_model == 0xf) && (c->x86_mask > 3)) ||
185 (c->x86_model == 0xe)) {
186 err = rdmsr_safe_on_cpu(data->id, 0xee, &eax, &edx);
187 if (err) {
188 dev_warn(&pdev->dev,
189 "Unable to access MSR 0xEE, Tjmax left at %d "
190 "degrees C\n", data->tjmax/1000);
191 } else if (eax & 0x40000000) {
192 data->tjmax = 85000;
193 }
194 }
195
196 platform_set_drvdata(pdev, data);
197
198 if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
199 goto exit_free;
200
201 data->class_dev = hwmon_device_register(&pdev->dev);
202 if (IS_ERR(data->class_dev)) {
203 err = PTR_ERR(data->class_dev);
204 dev_err(&pdev->dev, "Class registration failed (%d)\n",
205 err);
206 goto exit_class;
207 }
208
209 return 0;
210
211exit_class:
212 sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
213exit_free:
214 kfree(data);
215exit:
216 return err;
217}
218
219static int __devexit coretemp_remove(struct platform_device *pdev)
220{
221 struct coretemp_data *data = platform_get_drvdata(pdev);
222
223 hwmon_device_unregister(data->class_dev);
224 sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
225 platform_set_drvdata(pdev, NULL);
226 kfree(data);
227 return 0;
228}
229
230static struct platform_driver coretemp_driver = {
231 .driver = {
232 .owner = THIS_MODULE,
233 .name = DRVNAME,
234 },
235 .probe = coretemp_probe,
236 .remove = __devexit_p(coretemp_remove),
237};
238
239struct pdev_entry {
240 struct list_head list;
241 struct platform_device *pdev;
242 unsigned int cpu;
243};
244
245static LIST_HEAD(pdev_list);
246static DEFINE_MUTEX(pdev_list_mutex);
247
248static int __cpuinit coretemp_device_add(unsigned int cpu)
249{
250 int err;
251 struct platform_device *pdev;
252 struct pdev_entry *pdev_entry;
253
254 pdev = platform_device_alloc(DRVNAME, cpu);
255 if (!pdev) {
256 err = -ENOMEM;
257 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
258 goto exit;
259 }
260
261 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
262 if (!pdev_entry) {
263 err = -ENOMEM;
264 goto exit_device_put;
265 }
266
267 err = platform_device_add(pdev);
268 if (err) {
269 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
270 err);
271 goto exit_device_free;
272 }
273
274 pdev_entry->pdev = pdev;
275 pdev_entry->cpu = cpu;
276 mutex_lock(&pdev_list_mutex);
277 list_add_tail(&pdev_entry->list, &pdev_list);
278 mutex_unlock(&pdev_list_mutex);
279
280 return 0;
281
282exit_device_free:
283 kfree(pdev_entry);
284exit_device_put:
285 platform_device_put(pdev);
286exit:
287 return err;
288}
289
290#ifdef CONFIG_HOTPLUG_CPU
291void coretemp_device_remove(unsigned int cpu)
292{
293 struct pdev_entry *p, *n;
294 mutex_lock(&pdev_list_mutex);
295 list_for_each_entry_safe(p, n, &pdev_list, list) {
296 if (p->cpu == cpu) {
297 platform_device_unregister(p->pdev);
298 list_del(&p->list);
299 kfree(p);
300 }
301 }
302 mutex_unlock(&pdev_list_mutex);
303}
304
305static int coretemp_cpu_callback(struct notifier_block *nfb,
306 unsigned long action, void *hcpu)
307{
308 unsigned int cpu = (unsigned long) hcpu;
309
310 switch (action) {
311 case CPU_ONLINE:
312 coretemp_device_add(cpu);
313 break;
314 case CPU_DEAD:
315 coretemp_device_remove(cpu);
316 break;
317 }
318 return NOTIFY_OK;
319}
320
321static struct notifier_block __cpuinitdata coretemp_cpu_notifier = {
322 .notifier_call = coretemp_cpu_callback,
323};
324#endif /* !CONFIG_HOTPLUG_CPU */
325
326static int __init coretemp_init(void)
327{
328 int i, err = -ENODEV;
329 struct pdev_entry *p, *n;
330
331 printk(KERN_NOTICE DRVNAME ": This driver uses undocumented features "
332 "of Core CPU. Temperature might be wrong!\n");
333
334 /* quick check if we run Intel */
335 if (cpu_data[0].x86_vendor != X86_VENDOR_INTEL)
336 goto exit;
337
338 err = platform_driver_register(&coretemp_driver);
339 if (err)
340 goto exit;
341
342 for_each_online_cpu(i) {
343 struct cpuinfo_x86 *c = &(cpu_data)[i];
344
345 /* check if family 6, models e, f */
346 if ((c->cpuid_level < 0) || (c->x86 != 0x6) ||
347 !((c->x86_model == 0xe) || (c->x86_model == 0xf))) {
348
349 /* supported CPU not found, but report the unknown
350 family 6 CPU */
351 if ((c->x86 == 0x6) && (c->x86_model > 0xf))
352 printk(KERN_WARNING DRVNAME ": Unknown CPU "
353 "model %x\n", c->x86_model);
354 continue;
355 }
356
357 err = coretemp_device_add(i);
358 if (err)
359 goto exit_devices_unreg;
360 }
361 if (list_empty(&pdev_list)) {
362 err = -ENODEV;
363 goto exit_driver_unreg;
364 }
365
366#ifdef CONFIG_HOTPLUG_CPU
367 register_hotcpu_notifier(&coretemp_cpu_notifier);
368#endif
369 return 0;
370
371exit_devices_unreg:
372 mutex_lock(&pdev_list_mutex);
373 list_for_each_entry_safe(p, n, &pdev_list, list) {
374 platform_device_unregister(p->pdev);
375 list_del(&p->list);
376 kfree(p);
377 }
378 mutex_unlock(&pdev_list_mutex);
379exit_driver_unreg:
380 platform_driver_unregister(&coretemp_driver);
381exit:
382 return err;
383}
384
385static void __exit coretemp_exit(void)
386{
387 struct pdev_entry *p, *n;
388#ifdef CONFIG_HOTPLUG_CPU
389 unregister_hotcpu_notifier(&coretemp_cpu_notifier);
390#endif
391 mutex_lock(&pdev_list_mutex);
392 list_for_each_entry_safe(p, n, &pdev_list, list) {
393 platform_device_unregister(p->pdev);
394 list_del(&p->list);
395 kfree(p);
396 }
397 mutex_unlock(&pdev_list_mutex);
398 platform_driver_unregister(&coretemp_driver);
399}
400
401MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
402MODULE_DESCRIPTION("Intel Core temperature monitor");
403MODULE_LICENSE("GPL");
404
405module_init(coretemp_init)
406module_exit(coretemp_exit)
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-25 22:08:37 -0500