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70c38772 HW |
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 | ||
edb8d53c JP |
24 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
25 | ||
70c38772 | 26 | #include <linux/module.h> |
70c38772 HW |
27 | #include <linux/init.h> |
28 | #include <linux/slab.h> | |
70c38772 | 29 | #include <linux/hwmon.h> |
764e043b | 30 | #include <linux/hwmon-vid.h> |
70c38772 HW |
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 | ||
f2799418 | 43 | enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME }; |
70c38772 HW |
44 | |
45 | /* | |
46 | * Functions declaration | |
47 | */ | |
48 | ||
49 | struct via_cputemp_data { | |
50 | struct device *hwmon_dev; | |
51 | const char *name; | |
764e043b | 52 | u8 vrm; |
70c38772 | 53 | u32 id; |
764e043b JD |
54 | u32 msr_temp; |
55 | u32 msr_vid; | |
70c38772 HW |
56 | }; |
57 | ||
58 | /* | |
59 | * Sysfs stuff | |
60 | */ | |
61 | ||
62 | static 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 | ||
76 | static 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 | ||
764e043b | 83 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
70c38772 HW |
84 | if (err) |
85 | return -EAGAIN; | |
86 | ||
87 | return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); | |
88 | } | |
89 | ||
764e043b JD |
90 | static 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 | ||
70c38772 HW |
104 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, |
105 | SHOW_TEMP); | |
106 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
107 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
108 | ||
109 | static 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 | ||
116 | static const struct attribute_group via_cputemp_group = { | |
117 | .attrs = via_cputemp_attributes, | |
118 | }; | |
119 | ||
764e043b JD |
120 | /* Optional attributes */ |
121 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL); | |
122 | ||
70c38772 HW |
123 | static 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 */ | |
764e043b JD |
145 | data->msr_temp = 0x1169; |
146 | data->msr_vid = 0x198; | |
70c38772 HW |
147 | break; |
148 | case 0xF: | |
149 | /* Nano */ | |
764e043b | 150 | data->msr_temp = 0x1423; |
70c38772 HW |
151 | break; |
152 | default: | |
153 | err = -ENODEV; | |
154 | goto exit_free; | |
155 | } | |
156 | ||
157 | /* test if we can access the TEMPERATURE MSR */ | |
764e043b | 158 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
70c38772 HW |
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 | ||
764e043b JD |
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 | ||
70c38772 HW |
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 | ||
190 | exit_remove: | |
764e043b JD |
191 | if (data->vrm) |
192 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 HW |
193 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
194 | exit_free: | |
195 | platform_set_drvdata(pdev, NULL); | |
196 | kfree(data); | |
197 | exit: | |
198 | return err; | |
199 | } | |
200 | ||
201 | static 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); | |
764e043b JD |
206 | if (data->vrm) |
207 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 HW |
208 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
209 | platform_set_drvdata(pdev, NULL); | |
210 | kfree(data); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static 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 | ||
223 | struct pdev_entry { | |
224 | struct list_head list; | |
225 | struct platform_device *pdev; | |
226 | unsigned int cpu; | |
227 | }; | |
228 | ||
229 | static LIST_HEAD(pdev_list); | |
230 | static DEFINE_MUTEX(pdev_list_mutex); | |
231 | ||
232 | static 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; | |
edb8d53c | 241 | pr_err("Device allocation failed\n"); |
70c38772 HW |
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) { | |
edb8d53c | 253 | pr_err("Device addition failed (%d)\n", err); |
70c38772 HW |
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 | ||
265 | exit_device_free: | |
266 | kfree(pdev_entry); | |
267 | exit_device_put: | |
268 | platform_device_put(pdev); | |
269 | exit: | |
270 | return err; | |
271 | } | |
272 | ||
a5f42a6b | 273 | static void __cpuinit via_cputemp_device_remove(unsigned int cpu) |
70c38772 | 274 | { |
ae9e0ce7 JB |
275 | struct pdev_entry *p; |
276 | ||
70c38772 | 277 | mutex_lock(&pdev_list_mutex); |
ae9e0ce7 | 278 | list_for_each_entry(p, &pdev_list, list) { |
70c38772 HW |
279 | if (p->cpu == cpu) { |
280 | platform_device_unregister(p->pdev); | |
281 | list_del(&p->list); | |
ae9e0ce7 | 282 | mutex_unlock(&pdev_list_mutex); |
70c38772 | 283 | kfree(p); |
ae9e0ce7 | 284 | return; |
70c38772 HW |
285 | } |
286 | } | |
287 | mutex_unlock(&pdev_list_mutex); | |
288 | } | |
289 | ||
290 | static 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 | ||
307 | static struct notifier_block via_cputemp_cpu_notifier __refdata = { | |
308 | .notifier_call = via_cputemp_cpu_callback, | |
309 | }; | |
70c38772 HW |
310 | |
311 | static int __init via_cputemp_init(void) | |
312 | { | |
313 | int i, err; | |
70c38772 HW |
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) { | |
edb8d53c | 335 | pr_warn("Unknown CPU model 0x%x\n", c->x86_model); |
70c38772 HW |
336 | continue; |
337 | } | |
338 | ||
ae9e0ce7 | 339 | via_cputemp_device_add(i); |
70c38772 | 340 | } |
ae9e0ce7 JB |
341 | |
342 | #ifndef CONFIG_HOTPLUG_CPU | |
70c38772 HW |
343 | if (list_empty(&pdev_list)) { |
344 | err = -ENODEV; | |
345 | goto exit_driver_unreg; | |
346 | } | |
ae9e0ce7 | 347 | #endif |
70c38772 | 348 | |
70c38772 | 349 | register_hotcpu_notifier(&via_cputemp_cpu_notifier); |
70c38772 HW |
350 | return 0; |
351 | ||
ae9e0ce7 | 352 | #ifndef CONFIG_HOTPLUG_CPU |
70c38772 HW |
353 | exit_driver_unreg: |
354 | platform_driver_unregister(&via_cputemp_driver); | |
ae9e0ce7 | 355 | #endif |
70c38772 HW |
356 | exit: |
357 | return err; | |
358 | } | |
359 | ||
360 | static void __exit via_cputemp_exit(void) | |
361 | { | |
362 | struct pdev_entry *p, *n; | |
17c10d61 | 363 | |
70c38772 | 364 | unregister_hotcpu_notifier(&via_cputemp_cpu_notifier); |
70c38772 HW |
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 | ||
375 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); | |
376 | MODULE_DESCRIPTION("VIA CPU temperature monitor"); | |
377 | MODULE_LICENSE("GPL"); | |
378 | ||
379 | module_init(via_cputemp_init) | |
380 | module_exit(via_cputemp_exit) |