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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> | |
267fc978 | 40 | #include <asm/cpu_device_id.h> |
70c38772 HW |
41 | |
42 | #define DRVNAME "via_cputemp" | |
43 | ||
f2799418 | 44 | enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME }; |
70c38772 HW |
45 | |
46 | /* | |
47 | * Functions declaration | |
48 | */ | |
49 | ||
50 | struct via_cputemp_data { | |
51 | struct device *hwmon_dev; | |
52 | const char *name; | |
764e043b | 53 | u8 vrm; |
70c38772 | 54 | u32 id; |
764e043b JD |
55 | u32 msr_temp; |
56 | u32 msr_vid; | |
70c38772 HW |
57 | }; |
58 | ||
59 | /* | |
60 | * Sysfs stuff | |
61 | */ | |
62 | ||
63 | static 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 | ||
77 | static 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 | ||
764e043b | 84 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
70c38772 HW |
85 | if (err) |
86 | return -EAGAIN; | |
87 | ||
88 | return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); | |
89 | } | |
90 | ||
764e043b JD |
91 | static 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 | ||
70c38772 HW |
105 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, |
106 | SHOW_TEMP); | |
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 *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 | ||
117 | static const struct attribute_group via_cputemp_group = { | |
118 | .attrs = via_cputemp_attributes, | |
119 | }; | |
120 | ||
764e043b JD |
121 | /* Optional attributes */ |
122 | static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL); | |
123 | ||
6c931ae1 | 124 | static int via_cputemp_probe(struct platform_device *pdev) |
70c38772 HW |
125 | { |
126 | struct via_cputemp_data *data; | |
127 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); | |
128 | int err; | |
129 | u32 eax, edx; | |
130 | ||
505dc0cc GR |
131 | data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data), |
132 | GFP_KERNEL); | |
133 | if (!data) | |
134 | return -ENOMEM; | |
70c38772 HW |
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 */ | |
764e043b JD |
144 | data->msr_temp = 0x1169; |
145 | data->msr_vid = 0x198; | |
70c38772 HW |
146 | break; |
147 | case 0xF: | |
148 | /* Nano */ | |
764e043b | 149 | data->msr_temp = 0x1423; |
70c38772 HW |
150 | break; |
151 | default: | |
505dc0cc | 152 | return -ENODEV; |
70c38772 HW |
153 | } |
154 | ||
155 | /* test if we can access the TEMPERATURE MSR */ | |
764e043b | 156 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
70c38772 HW |
157 | if (err) { |
158 | dev_err(&pdev->dev, | |
159 | "Unable to access TEMPERATURE MSR, giving up\n"); | |
505dc0cc | 160 | return err; |
70c38772 HW |
161 | } |
162 | ||
163 | platform_set_drvdata(pdev, data); | |
164 | ||
165 | err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group); | |
166 | if (err) | |
505dc0cc | 167 | return err; |
70c38772 | 168 | |
764e043b JD |
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 | ||
70c38772 HW |
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 | ||
188 | exit_remove: | |
764e043b JD |
189 | if (data->vrm) |
190 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 | 191 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
70c38772 HW |
192 | return err; |
193 | } | |
194 | ||
195 | static int __devexit 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); | |
764e043b JD |
200 | if (data->vrm) |
201 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 | 202 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
70c38772 HW |
203 | return 0; |
204 | } | |
205 | ||
206 | static struct platform_driver via_cputemp_driver = { | |
207 | .driver = { | |
208 | .owner = THIS_MODULE, | |
209 | .name = DRVNAME, | |
210 | }, | |
211 | .probe = via_cputemp_probe, | |
9e5e9b7a | 212 | .remove = via_cputemp_remove, |
70c38772 HW |
213 | }; |
214 | ||
215 | struct pdev_entry { | |
216 | struct list_head list; | |
217 | struct platform_device *pdev; | |
218 | unsigned int cpu; | |
219 | }; | |
220 | ||
221 | static LIST_HEAD(pdev_list); | |
222 | static DEFINE_MUTEX(pdev_list_mutex); | |
223 | ||
224 | static int __cpuinit 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; | |
edb8d53c | 233 | pr_err("Device allocation failed\n"); |
70c38772 HW |
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) { | |
edb8d53c | 245 | pr_err("Device addition failed (%d)\n", err); |
70c38772 HW |
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 | ||
257 | exit_device_free: | |
258 | kfree(pdev_entry); | |
259 | exit_device_put: | |
260 | platform_device_put(pdev); | |
261 | exit: | |
262 | return err; | |
263 | } | |
264 | ||
a5f42a6b | 265 | static void __cpuinit via_cputemp_device_remove(unsigned int cpu) |
70c38772 | 266 | { |
ae9e0ce7 JB |
267 | struct pdev_entry *p; |
268 | ||
70c38772 | 269 | mutex_lock(&pdev_list_mutex); |
ae9e0ce7 | 270 | list_for_each_entry(p, &pdev_list, list) { |
70c38772 HW |
271 | if (p->cpu == cpu) { |
272 | platform_device_unregister(p->pdev); | |
273 | list_del(&p->list); | |
ae9e0ce7 | 274 | mutex_unlock(&pdev_list_mutex); |
70c38772 | 275 | kfree(p); |
ae9e0ce7 | 276 | return; |
70c38772 HW |
277 | } |
278 | } | |
279 | mutex_unlock(&pdev_list_mutex); | |
280 | } | |
281 | ||
282 | static int __cpuinit 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 | ||
299 | static struct notifier_block via_cputemp_cpu_notifier __refdata = { | |
300 | .notifier_call = via_cputemp_cpu_callback, | |
301 | }; | |
70c38772 | 302 | |
e273bd98 | 303 | static const struct x86_cpu_id __initconst cputemp_ids[] = { |
267fc978 AK |
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 | }; | |
309 | MODULE_DEVICE_TABLE(x86cpu, cputemp_ids); | |
310 | ||
70c38772 HW |
311 | static int __init via_cputemp_init(void) |
312 | { | |
313 | int i, err; | |
70c38772 | 314 | |
267fc978 AK |
315 | if (!x86_match_cpu(cputemp_ids)) |
316 | return -ENODEV; | |
70c38772 HW |
317 | |
318 | err = platform_driver_register(&via_cputemp_driver); | |
319 | if (err) | |
320 | goto exit; | |
321 | ||
1ec3ddfd | 322 | get_online_cpus(); |
70c38772 HW |
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) { | |
edb8d53c | 333 | pr_warn("Unknown CPU model 0x%x\n", c->x86_model); |
70c38772 HW |
334 | continue; |
335 | } | |
336 | ||
ae9e0ce7 | 337 | via_cputemp_device_add(i); |
70c38772 | 338 | } |
ae9e0ce7 JB |
339 | |
340 | #ifndef CONFIG_HOTPLUG_CPU | |
70c38772 | 341 | if (list_empty(&pdev_list)) { |
1ec3ddfd | 342 | put_online_cpus(); |
70c38772 HW |
343 | err = -ENODEV; |
344 | goto exit_driver_unreg; | |
345 | } | |
ae9e0ce7 | 346 | #endif |
70c38772 | 347 | |
70c38772 | 348 | register_hotcpu_notifier(&via_cputemp_cpu_notifier); |
1ec3ddfd | 349 | put_online_cpus(); |
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 | |
1ec3ddfd | 364 | get_online_cpus(); |
70c38772 | 365 | unregister_hotcpu_notifier(&via_cputemp_cpu_notifier); |
70c38772 HW |
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); | |
1ec3ddfd | 373 | put_online_cpus(); |
70c38772 HW |
374 | platform_driver_unregister(&via_cputemp_driver); |
375 | } | |
376 | ||
377 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); | |
378 | MODULE_DESCRIPTION("VIA CPU temperature monitor"); | |
379 | MODULE_LICENSE("GPL"); | |
380 | ||
381 | module_init(via_cputemp_init) | |
382 | module_exit(via_cputemp_exit) |