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1/*
2 * via-cputemp.c - Driver for VIA CPU core temperature monitoring
3 * Copyright (C) 2009 VIA Technologies, Inc.
4 *
5 * based on existing coretemp.c, which is
6 *
7 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 * 02110-1301 USA.
22 */
23
24#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <linux/hwmon.h>
30#include <linux/hwmon-vid.h>
31#include <linux/sysfs.h>
32#include <linux/hwmon-sysfs.h>
33#include <linux/err.h>
34#include <linux/mutex.h>
35#include <linux/list.h>
36#include <linux/platform_device.h>
37#include <linux/cpu.h>
38#include <asm/msr.h>
39#include <asm/processor.h>
40
41#define DRVNAME "via_cputemp"
42
43enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
44
45/*
46 * Functions declaration
47 */
48
49struct via_cputemp_data {
50 struct device *hwmon_dev;
51 const char *name;
52 u8 vrm;
53 u32 id;
54 u32 msr_temp;
55 u32 msr_vid;
56};
57
58/*
59 * Sysfs stuff
60 */
61
62static ssize_t show_name(struct device *dev, struct device_attribute
63 *devattr, char *buf)
64{
65 int ret;
66 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
67 struct via_cputemp_data *data = dev_get_drvdata(dev);
68
69 if (attr->index == SHOW_NAME)
70 ret = sprintf(buf, "%s\n", data->name);
71 else /* show label */
72 ret = sprintf(buf, "Core %d\n", data->id);
73 return ret;
74}
75
76static ssize_t show_temp(struct device *dev,
77 struct device_attribute *devattr, char *buf)
78{
79 struct via_cputemp_data *data = dev_get_drvdata(dev);
80 u32 eax, edx;
81 int err;
82
83 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
84 if (err)
85 return -EAGAIN;
86
87 return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
88}
89
90static ssize_t show_cpu_vid(struct device *dev,
91 struct device_attribute *devattr, char *buf)
92{
93 struct via_cputemp_data *data = dev_get_drvdata(dev);
94 u32 eax, edx;
95 int err;
96
97 err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
98 if (err)
99 return -EAGAIN;
100
101 return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
102}
103
104static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
105 SHOW_TEMP);
106static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
107static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
108
109static struct attribute *via_cputemp_attributes[] = {
110 &sensor_dev_attr_name.dev_attr.attr,
111 &sensor_dev_attr_temp1_label.dev_attr.attr,
112 &sensor_dev_attr_temp1_input.dev_attr.attr,
113 NULL
114};
115
116static const struct attribute_group via_cputemp_group = {
117 .attrs = via_cputemp_attributes,
118};
119
120/* Optional attributes */
121static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);
122
123static int __devinit via_cputemp_probe(struct platform_device *pdev)
124{
125 struct via_cputemp_data *data;
126 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
127 int err;
128 u32 eax, edx;
129
130 data = kzalloc(sizeof(struct via_cputemp_data), GFP_KERNEL);
131 if (!data) {
132 err = -ENOMEM;
133 dev_err(&pdev->dev, "Out of memory\n");
134 goto exit;
135 }
136
137 data->id = pdev->id;
138 data->name = "via_cputemp";
139
140 switch (c->x86_model) {
141 case 0xA:
142 /* C7 A */
143 case 0xD:
144 /* C7 D */
145 data->msr_temp = 0x1169;
146 data->msr_vid = 0x198;
147 break;
148 case 0xF:
149 /* Nano */
150 data->msr_temp = 0x1423;
151 break;
152 default:
153 err = -ENODEV;
154 goto exit_free;
155 }
156
157 /* test if we can access the TEMPERATURE MSR */
158 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
159 if (err) {
160 dev_err(&pdev->dev,
161 "Unable to access TEMPERATURE MSR, giving up\n");
162 goto exit_free;
163 }
164
165 platform_set_drvdata(pdev, data);
166
167 err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
168 if (err)
169 goto exit_free;
170
171 if (data->msr_vid)
172 data->vrm = vid_which_vrm();
173
174 if (data->vrm) {
175 err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
176 if (err)
177 goto exit_remove;
178 }
179
180 data->hwmon_dev = hwmon_device_register(&pdev->dev);
181 if (IS_ERR(data->hwmon_dev)) {
182 err = PTR_ERR(data->hwmon_dev);
183 dev_err(&pdev->dev, "Class registration failed (%d)\n",
184 err);
185 goto exit_remove;
186 }
187
188 return 0;
189
190exit_remove:
191 if (data->vrm)
192 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
193 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
194exit_free:
195 platform_set_drvdata(pdev, NULL);
196 kfree(data);
197exit:
198 return err;
199}
200
201static int __devexit via_cputemp_remove(struct platform_device *pdev)
202{
203 struct via_cputemp_data *data = platform_get_drvdata(pdev);
204
205 hwmon_device_unregister(data->hwmon_dev);
206 if (data->vrm)
207 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
208 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
209 platform_set_drvdata(pdev, NULL);
210 kfree(data);
211 return 0;
212}
213
214static struct platform_driver via_cputemp_driver = {
215 .driver = {
216 .owner = THIS_MODULE,
217 .name = DRVNAME,
218 },
219 .probe = via_cputemp_probe,
220 .remove = __devexit_p(via_cputemp_remove),
221};
222
223struct pdev_entry {
224 struct list_head list;
225 struct platform_device *pdev;
226 unsigned int cpu;
227};
228
229static LIST_HEAD(pdev_list);
230static DEFINE_MUTEX(pdev_list_mutex);
231
232static int __cpuinit via_cputemp_device_add(unsigned int cpu)
233{
234 int err;
235 struct platform_device *pdev;
236 struct pdev_entry *pdev_entry;
237
238 pdev = platform_device_alloc(DRVNAME, cpu);
239 if (!pdev) {
240 err = -ENOMEM;
241 pr_err("Device allocation failed\n");
242 goto exit;
243 }
244
245 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
246 if (!pdev_entry) {
247 err = -ENOMEM;
248 goto exit_device_put;
249 }
250
251 err = platform_device_add(pdev);
252 if (err) {
253 pr_err("Device addition failed (%d)\n", err);
254 goto exit_device_free;
255 }
256
257 pdev_entry->pdev = pdev;
258 pdev_entry->cpu = cpu;
259 mutex_lock(&pdev_list_mutex);
260 list_add_tail(&pdev_entry->list, &pdev_list);
261 mutex_unlock(&pdev_list_mutex);
262
263 return 0;
264
265exit_device_free:
266 kfree(pdev_entry);
267exit_device_put:
268 platform_device_put(pdev);
269exit:
270 return err;
271}
272
273static void __cpuinit via_cputemp_device_remove(unsigned int cpu)
274{
275 struct pdev_entry *p;
276
277 mutex_lock(&pdev_list_mutex);
278 list_for_each_entry(p, &pdev_list, list) {
279 if (p->cpu == cpu) {
280 platform_device_unregister(p->pdev);
281 list_del(&p->list);
282 mutex_unlock(&pdev_list_mutex);
283 kfree(p);
284 return;
285 }
286 }
287 mutex_unlock(&pdev_list_mutex);
288}
289
290static int __cpuinit via_cputemp_cpu_callback(struct notifier_block *nfb,
291 unsigned long action, void *hcpu)
292{
293 unsigned int cpu = (unsigned long) hcpu;
294
295 switch (action) {
296 case CPU_ONLINE:
297 case CPU_DOWN_FAILED:
298 via_cputemp_device_add(cpu);
299 break;
300 case CPU_DOWN_PREPARE:
301 via_cputemp_device_remove(cpu);
302 break;
303 }
304 return NOTIFY_OK;
305}
306
307static struct notifier_block via_cputemp_cpu_notifier __refdata = {
308 .notifier_call = via_cputemp_cpu_callback,
309};
310
311static int __init via_cputemp_init(void)
312{
313 int i, err;
314
315 if (cpu_data(0).x86_vendor != X86_VENDOR_CENTAUR) {
316 printk(KERN_DEBUG DRVNAME ": Not a VIA CPU\n");
317 err = -ENODEV;
318 goto exit;
319 }
320
321 err = platform_driver_register(&via_cputemp_driver);
322 if (err)
323 goto exit;
324
325 for_each_online_cpu(i) {
326 struct cpuinfo_x86 *c = &cpu_data(i);
327
328 if (c->x86 != 6)
329 continue;
330
331 if (c->x86_model < 0x0a)
332 continue;
333
334 if (c->x86_model > 0x0f) {
335 pr_warn("Unknown CPU model 0x%x\n", c->x86_model);
336 continue;
337 }
338
339 via_cputemp_device_add(i);
340 }
341
342#ifndef CONFIG_HOTPLUG_CPU
343 if (list_empty(&pdev_list)) {
344 err = -ENODEV;
345 goto exit_driver_unreg;
346 }
347#endif
348
349 register_hotcpu_notifier(&via_cputemp_cpu_notifier);
350 return 0;
351
352#ifndef CONFIG_HOTPLUG_CPU
353exit_driver_unreg:
354 platform_driver_unregister(&via_cputemp_driver);
355#endif
356exit:
357 return err;
358}
359
360static void __exit via_cputemp_exit(void)
361{
362 struct pdev_entry *p, *n;
363
364 unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
365 mutex_lock(&pdev_list_mutex);
366 list_for_each_entry_safe(p, n, &pdev_list, list) {
367 platform_device_unregister(p->pdev);
368 list_del(&p->list);
369 kfree(p);
370 }
371 mutex_unlock(&pdev_list_mutex);
372 platform_driver_unregister(&via_cputemp_driver);
373}
374
375MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
376MODULE_DESCRIPTION("VIA CPU temperature monitor");
377MODULE_LICENSE("GPL");
378
379module_init(via_cputemp_init)
380module_exit(via_cputemp_exit)
1/*
2 * via-cputemp.c - Driver for VIA CPU core temperature monitoring
3 * Copyright (C) 2009 VIA Technologies, Inc.
4 *
5 * based on existing coretemp.c, which is
6 *
7 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 * 02110-1301 USA.
22 */
23
24#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <linux/hwmon.h>
30#include <linux/hwmon-vid.h>
31#include <linux/sysfs.h>
32#include <linux/hwmon-sysfs.h>
33#include <linux/err.h>
34#include <linux/mutex.h>
35#include <linux/list.h>
36#include <linux/platform_device.h>
37#include <linux/cpu.h>
38#include <asm/msr.h>
39#include <asm/processor.h>
40#include <asm/cpu_device_id.h>
41
42#define DRVNAME "via_cputemp"
43
44enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
45
46/*
47 * Functions declaration
48 */
49
50struct via_cputemp_data {
51 struct device *hwmon_dev;
52 const char *name;
53 u8 vrm;
54 u32 id;
55 u32 msr_temp;
56 u32 msr_vid;
57};
58
59/*
60 * Sysfs stuff
61 */
62
63static ssize_t show_name(struct device *dev, struct device_attribute
64 *devattr, char *buf)
65{
66 int ret;
67 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
68 struct via_cputemp_data *data = dev_get_drvdata(dev);
69
70 if (attr->index == SHOW_NAME)
71 ret = sprintf(buf, "%s\n", data->name);
72 else /* show label */
73 ret = sprintf(buf, "Core %d\n", data->id);
74 return ret;
75}
76
77static ssize_t show_temp(struct device *dev,
78 struct device_attribute *devattr, char *buf)
79{
80 struct via_cputemp_data *data = dev_get_drvdata(dev);
81 u32 eax, edx;
82 int err;
83
84 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
85 if (err)
86 return -EAGAIN;
87
88 return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
89}
90
91static ssize_t show_cpu_vid(struct device *dev,
92 struct device_attribute *devattr, char *buf)
93{
94 struct via_cputemp_data *data = dev_get_drvdata(dev);
95 u32 eax, edx;
96 int err;
97
98 err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
99 if (err)
100 return -EAGAIN;
101
102 return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
103}
104
105static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
106 SHOW_TEMP);
107static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
108static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
109
110static struct attribute *via_cputemp_attributes[] = {
111 &sensor_dev_attr_name.dev_attr.attr,
112 &sensor_dev_attr_temp1_label.dev_attr.attr,
113 &sensor_dev_attr_temp1_input.dev_attr.attr,
114 NULL
115};
116
117static const struct attribute_group via_cputemp_group = {
118 .attrs = via_cputemp_attributes,
119};
120
121/* Optional attributes */
122static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);
123
124static int via_cputemp_probe(struct platform_device *pdev)
125{
126 struct via_cputemp_data *data;
127 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
128 int err;
129 u32 eax, edx;
130
131 data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data),
132 GFP_KERNEL);
133 if (!data)
134 return -ENOMEM;
135
136 data->id = pdev->id;
137 data->name = "via_cputemp";
138
139 switch (c->x86_model) {
140 case 0xA:
141 /* C7 A */
142 case 0xD:
143 /* C7 D */
144 data->msr_temp = 0x1169;
145 data->msr_vid = 0x198;
146 break;
147 case 0xF:
148 /* Nano */
149 data->msr_temp = 0x1423;
150 break;
151 default:
152 return -ENODEV;
153 }
154
155 /* test if we can access the TEMPERATURE MSR */
156 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
157 if (err) {
158 dev_err(&pdev->dev,
159 "Unable to access TEMPERATURE MSR, giving up\n");
160 return err;
161 }
162
163 platform_set_drvdata(pdev, data);
164
165 err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
166 if (err)
167 return err;
168
169 if (data->msr_vid)
170 data->vrm = vid_which_vrm();
171
172 if (data->vrm) {
173 err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
174 if (err)
175 goto exit_remove;
176 }
177
178 data->hwmon_dev = hwmon_device_register(&pdev->dev);
179 if (IS_ERR(data->hwmon_dev)) {
180 err = PTR_ERR(data->hwmon_dev);
181 dev_err(&pdev->dev, "Class registration failed (%d)\n",
182 err);
183 goto exit_remove;
184 }
185
186 return 0;
187
188exit_remove:
189 if (data->vrm)
190 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
191 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
192 return err;
193}
194
195static int via_cputemp_remove(struct platform_device *pdev)
196{
197 struct via_cputemp_data *data = platform_get_drvdata(pdev);
198
199 hwmon_device_unregister(data->hwmon_dev);
200 if (data->vrm)
201 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
202 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
203 return 0;
204}
205
206static struct platform_driver via_cputemp_driver = {
207 .driver = {
208 .owner = THIS_MODULE,
209 .name = DRVNAME,
210 },
211 .probe = via_cputemp_probe,
212 .remove = via_cputemp_remove,
213};
214
215struct pdev_entry {
216 struct list_head list;
217 struct platform_device *pdev;
218 unsigned int cpu;
219};
220
221static LIST_HEAD(pdev_list);
222static DEFINE_MUTEX(pdev_list_mutex);
223
224static int via_cputemp_device_add(unsigned int cpu)
225{
226 int err;
227 struct platform_device *pdev;
228 struct pdev_entry *pdev_entry;
229
230 pdev = platform_device_alloc(DRVNAME, cpu);
231 if (!pdev) {
232 err = -ENOMEM;
233 pr_err("Device allocation failed\n");
234 goto exit;
235 }
236
237 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
238 if (!pdev_entry) {
239 err = -ENOMEM;
240 goto exit_device_put;
241 }
242
243 err = platform_device_add(pdev);
244 if (err) {
245 pr_err("Device addition failed (%d)\n", err);
246 goto exit_device_free;
247 }
248
249 pdev_entry->pdev = pdev;
250 pdev_entry->cpu = cpu;
251 mutex_lock(&pdev_list_mutex);
252 list_add_tail(&pdev_entry->list, &pdev_list);
253 mutex_unlock(&pdev_list_mutex);
254
255 return 0;
256
257exit_device_free:
258 kfree(pdev_entry);
259exit_device_put:
260 platform_device_put(pdev);
261exit:
262 return err;
263}
264
265static void via_cputemp_device_remove(unsigned int cpu)
266{
267 struct pdev_entry *p;
268
269 mutex_lock(&pdev_list_mutex);
270 list_for_each_entry(p, &pdev_list, list) {
271 if (p->cpu == cpu) {
272 platform_device_unregister(p->pdev);
273 list_del(&p->list);
274 mutex_unlock(&pdev_list_mutex);
275 kfree(p);
276 return;
277 }
278 }
279 mutex_unlock(&pdev_list_mutex);
280}
281
282static int via_cputemp_cpu_callback(struct notifier_block *nfb,
283 unsigned long action, void *hcpu)
284{
285 unsigned int cpu = (unsigned long) hcpu;
286
287 switch (action) {
288 case CPU_ONLINE:
289 case CPU_DOWN_FAILED:
290 via_cputemp_device_add(cpu);
291 break;
292 case CPU_DOWN_PREPARE:
293 via_cputemp_device_remove(cpu);
294 break;
295 }
296 return NOTIFY_OK;
297}
298
299static struct notifier_block via_cputemp_cpu_notifier __refdata = {
300 .notifier_call = via_cputemp_cpu_callback,
301};
302
303static const struct x86_cpu_id __initconst cputemp_ids[] = {
304 { X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */
305 { X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */
306 { X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */
307 {}
308};
309MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
310
311static int __init via_cputemp_init(void)
312{
313 int i, err;
314
315 if (!x86_match_cpu(cputemp_ids))
316 return -ENODEV;
317
318 err = platform_driver_register(&via_cputemp_driver);
319 if (err)
320 goto exit;
321
322 cpu_notifier_register_begin();
323 for_each_online_cpu(i) {
324 struct cpuinfo_x86 *c = &cpu_data(i);
325
326 if (c->x86 != 6)
327 continue;
328
329 if (c->x86_model < 0x0a)
330 continue;
331
332 if (c->x86_model > 0x0f) {
333 pr_warn("Unknown CPU model 0x%x\n", c->x86_model);
334 continue;
335 }
336
337 via_cputemp_device_add(i);
338 }
339
340#ifndef CONFIG_HOTPLUG_CPU
341 if (list_empty(&pdev_list)) {
342 cpu_notifier_register_done();
343 err = -ENODEV;
344 goto exit_driver_unreg;
345 }
346#endif
347
348 __register_hotcpu_notifier(&via_cputemp_cpu_notifier);
349 cpu_notifier_register_done();
350 return 0;
351
352#ifndef CONFIG_HOTPLUG_CPU
353exit_driver_unreg:
354 platform_driver_unregister(&via_cputemp_driver);
355#endif
356exit:
357 return err;
358}
359
360static void __exit via_cputemp_exit(void)
361{
362 struct pdev_entry *p, *n;
363
364 cpu_notifier_register_begin();
365 __unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
366 mutex_lock(&pdev_list_mutex);
367 list_for_each_entry_safe(p, n, &pdev_list, list) {
368 platform_device_unregister(p->pdev);
369 list_del(&p->list);
370 kfree(p);
371 }
372 mutex_unlock(&pdev_list_mutex);
373 cpu_notifier_register_done();
374 platform_driver_unregister(&via_cputemp_driver);
375}
376
377MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
378MODULE_DESCRIPTION("VIA CPU temperature monitor");
379MODULE_LICENSE("GPL");
380
381module_init(via_cputemp_init)
382module_exit(via_cputemp_exit)