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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 | ||
24 | #include <linux/module.h> | |
70c38772 HW |
25 | #include <linux/init.h> |
26 | #include <linux/slab.h> | |
70c38772 HW |
27 | #include <linux/hwmon.h> |
28 | #include <linux/sysfs.h> | |
29 | #include <linux/hwmon-sysfs.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/mutex.h> | |
32 | #include <linux/list.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/cpu.h> | |
35 | #include <asm/msr.h> | |
36 | #include <asm/processor.h> | |
37 | ||
38 | #define DRVNAME "via_cputemp" | |
39 | ||
f2799418 | 40 | enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME }; |
70c38772 HW |
41 | |
42 | /* | |
43 | * Functions declaration | |
44 | */ | |
45 | ||
46 | struct via_cputemp_data { | |
47 | struct device *hwmon_dev; | |
48 | const char *name; | |
49 | u32 id; | |
50 | u32 msr; | |
51 | }; | |
52 | ||
53 | /* | |
54 | * Sysfs stuff | |
55 | */ | |
56 | ||
57 | static ssize_t show_name(struct device *dev, struct device_attribute | |
58 | *devattr, char *buf) | |
59 | { | |
60 | int ret; | |
61 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
62 | struct via_cputemp_data *data = dev_get_drvdata(dev); | |
63 | ||
64 | if (attr->index == SHOW_NAME) | |
65 | ret = sprintf(buf, "%s\n", data->name); | |
66 | else /* show label */ | |
67 | ret = sprintf(buf, "Core %d\n", data->id); | |
68 | return ret; | |
69 | } | |
70 | ||
71 | static ssize_t show_temp(struct device *dev, | |
72 | struct device_attribute *devattr, char *buf) | |
73 | { | |
74 | struct via_cputemp_data *data = dev_get_drvdata(dev); | |
75 | u32 eax, edx; | |
76 | int err; | |
77 | ||
78 | err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx); | |
79 | if (err) | |
80 | return -EAGAIN; | |
81 | ||
82 | return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); | |
83 | } | |
84 | ||
85 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, | |
86 | SHOW_TEMP); | |
87 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
88 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
89 | ||
90 | static struct attribute *via_cputemp_attributes[] = { | |
91 | &sensor_dev_attr_name.dev_attr.attr, | |
92 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
93 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
94 | NULL | |
95 | }; | |
96 | ||
97 | static const struct attribute_group via_cputemp_group = { | |
98 | .attrs = via_cputemp_attributes, | |
99 | }; | |
100 | ||
101 | static int __devinit via_cputemp_probe(struct platform_device *pdev) | |
102 | { | |
103 | struct via_cputemp_data *data; | |
104 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); | |
105 | int err; | |
106 | u32 eax, edx; | |
107 | ||
108 | data = kzalloc(sizeof(struct via_cputemp_data), GFP_KERNEL); | |
109 | if (!data) { | |
110 | err = -ENOMEM; | |
111 | dev_err(&pdev->dev, "Out of memory\n"); | |
112 | goto exit; | |
113 | } | |
114 | ||
115 | data->id = pdev->id; | |
116 | data->name = "via_cputemp"; | |
117 | ||
118 | switch (c->x86_model) { | |
119 | case 0xA: | |
120 | /* C7 A */ | |
121 | case 0xD: | |
122 | /* C7 D */ | |
123 | data->msr = 0x1169; | |
124 | break; | |
125 | case 0xF: | |
126 | /* Nano */ | |
127 | data->msr = 0x1423; | |
128 | break; | |
129 | default: | |
130 | err = -ENODEV; | |
131 | goto exit_free; | |
132 | } | |
133 | ||
134 | /* test if we can access the TEMPERATURE MSR */ | |
135 | err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx); | |
136 | if (err) { | |
137 | dev_err(&pdev->dev, | |
138 | "Unable to access TEMPERATURE MSR, giving up\n"); | |
139 | goto exit_free; | |
140 | } | |
141 | ||
142 | platform_set_drvdata(pdev, data); | |
143 | ||
144 | err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group); | |
145 | if (err) | |
146 | goto exit_free; | |
147 | ||
148 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
149 | if (IS_ERR(data->hwmon_dev)) { | |
150 | err = PTR_ERR(data->hwmon_dev); | |
151 | dev_err(&pdev->dev, "Class registration failed (%d)\n", | |
152 | err); | |
153 | goto exit_remove; | |
154 | } | |
155 | ||
156 | return 0; | |
157 | ||
158 | exit_remove: | |
159 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); | |
160 | exit_free: | |
161 | platform_set_drvdata(pdev, NULL); | |
162 | kfree(data); | |
163 | exit: | |
164 | return err; | |
165 | } | |
166 | ||
167 | static int __devexit via_cputemp_remove(struct platform_device *pdev) | |
168 | { | |
169 | struct via_cputemp_data *data = platform_get_drvdata(pdev); | |
170 | ||
171 | hwmon_device_unregister(data->hwmon_dev); | |
172 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); | |
173 | platform_set_drvdata(pdev, NULL); | |
174 | kfree(data); | |
175 | return 0; | |
176 | } | |
177 | ||
178 | static struct platform_driver via_cputemp_driver = { | |
179 | .driver = { | |
180 | .owner = THIS_MODULE, | |
181 | .name = DRVNAME, | |
182 | }, | |
183 | .probe = via_cputemp_probe, | |
184 | .remove = __devexit_p(via_cputemp_remove), | |
185 | }; | |
186 | ||
187 | struct pdev_entry { | |
188 | struct list_head list; | |
189 | struct platform_device *pdev; | |
190 | unsigned int cpu; | |
191 | }; | |
192 | ||
193 | static LIST_HEAD(pdev_list); | |
194 | static DEFINE_MUTEX(pdev_list_mutex); | |
195 | ||
196 | static int __cpuinit via_cputemp_device_add(unsigned int cpu) | |
197 | { | |
198 | int err; | |
199 | struct platform_device *pdev; | |
200 | struct pdev_entry *pdev_entry; | |
201 | ||
202 | pdev = platform_device_alloc(DRVNAME, cpu); | |
203 | if (!pdev) { | |
204 | err = -ENOMEM; | |
205 | printk(KERN_ERR DRVNAME ": Device allocation failed\n"); | |
206 | goto exit; | |
207 | } | |
208 | ||
209 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
210 | if (!pdev_entry) { | |
211 | err = -ENOMEM; | |
212 | goto exit_device_put; | |
213 | } | |
214 | ||
215 | err = platform_device_add(pdev); | |
216 | if (err) { | |
217 | printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", | |
218 | err); | |
219 | goto exit_device_free; | |
220 | } | |
221 | ||
222 | pdev_entry->pdev = pdev; | |
223 | pdev_entry->cpu = cpu; | |
224 | mutex_lock(&pdev_list_mutex); | |
225 | list_add_tail(&pdev_entry->list, &pdev_list); | |
226 | mutex_unlock(&pdev_list_mutex); | |
227 | ||
228 | return 0; | |
229 | ||
230 | exit_device_free: | |
231 | kfree(pdev_entry); | |
232 | exit_device_put: | |
233 | platform_device_put(pdev); | |
234 | exit: | |
235 | return err; | |
236 | } | |
237 | ||
238 | #ifdef CONFIG_HOTPLUG_CPU | |
a5f42a6b | 239 | static void __cpuinit via_cputemp_device_remove(unsigned int cpu) |
70c38772 HW |
240 | { |
241 | struct pdev_entry *p, *n; | |
242 | mutex_lock(&pdev_list_mutex); | |
243 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
244 | if (p->cpu == cpu) { | |
245 | platform_device_unregister(p->pdev); | |
246 | list_del(&p->list); | |
247 | kfree(p); | |
248 | } | |
249 | } | |
250 | mutex_unlock(&pdev_list_mutex); | |
251 | } | |
252 | ||
253 | static int __cpuinit via_cputemp_cpu_callback(struct notifier_block *nfb, | |
254 | unsigned long action, void *hcpu) | |
255 | { | |
256 | unsigned int cpu = (unsigned long) hcpu; | |
257 | ||
258 | switch (action) { | |
259 | case CPU_ONLINE: | |
260 | case CPU_DOWN_FAILED: | |
261 | via_cputemp_device_add(cpu); | |
262 | break; | |
263 | case CPU_DOWN_PREPARE: | |
264 | via_cputemp_device_remove(cpu); | |
265 | break; | |
266 | } | |
267 | return NOTIFY_OK; | |
268 | } | |
269 | ||
270 | static struct notifier_block via_cputemp_cpu_notifier __refdata = { | |
271 | .notifier_call = via_cputemp_cpu_callback, | |
272 | }; | |
273 | #endif /* !CONFIG_HOTPLUG_CPU */ | |
274 | ||
275 | static int __init via_cputemp_init(void) | |
276 | { | |
277 | int i, err; | |
278 | struct pdev_entry *p, *n; | |
279 | ||
280 | if (cpu_data(0).x86_vendor != X86_VENDOR_CENTAUR) { | |
281 | printk(KERN_DEBUG DRVNAME ": Not a VIA CPU\n"); | |
282 | err = -ENODEV; | |
283 | goto exit; | |
284 | } | |
285 | ||
286 | err = platform_driver_register(&via_cputemp_driver); | |
287 | if (err) | |
288 | goto exit; | |
289 | ||
290 | for_each_online_cpu(i) { | |
291 | struct cpuinfo_x86 *c = &cpu_data(i); | |
292 | ||
293 | if (c->x86 != 6) | |
294 | continue; | |
295 | ||
296 | if (c->x86_model < 0x0a) | |
297 | continue; | |
298 | ||
299 | if (c->x86_model > 0x0f) { | |
300 | printk(KERN_WARNING DRVNAME ": Unknown CPU " | |
301 | "model 0x%x\n", c->x86_model); | |
302 | continue; | |
303 | } | |
304 | ||
305 | err = via_cputemp_device_add(i); | |
306 | if (err) | |
307 | goto exit_devices_unreg; | |
308 | } | |
309 | if (list_empty(&pdev_list)) { | |
310 | err = -ENODEV; | |
311 | goto exit_driver_unreg; | |
312 | } | |
313 | ||
314 | #ifdef CONFIG_HOTPLUG_CPU | |
315 | register_hotcpu_notifier(&via_cputemp_cpu_notifier); | |
316 | #endif | |
317 | return 0; | |
318 | ||
319 | exit_devices_unreg: | |
320 | mutex_lock(&pdev_list_mutex); | |
321 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
322 | platform_device_unregister(p->pdev); | |
323 | list_del(&p->list); | |
324 | kfree(p); | |
325 | } | |
326 | mutex_unlock(&pdev_list_mutex); | |
327 | exit_driver_unreg: | |
328 | platform_driver_unregister(&via_cputemp_driver); | |
329 | exit: | |
330 | return err; | |
331 | } | |
332 | ||
333 | static void __exit via_cputemp_exit(void) | |
334 | { | |
335 | struct pdev_entry *p, *n; | |
336 | #ifdef CONFIG_HOTPLUG_CPU | |
337 | unregister_hotcpu_notifier(&via_cputemp_cpu_notifier); | |
338 | #endif | |
339 | mutex_lock(&pdev_list_mutex); | |
340 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
341 | platform_device_unregister(p->pdev); | |
342 | list_del(&p->list); | |
343 | kfree(p); | |
344 | } | |
345 | mutex_unlock(&pdev_list_mutex); | |
346 | platform_driver_unregister(&via_cputemp_driver); | |
347 | } | |
348 | ||
349 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); | |
350 | MODULE_DESCRIPTION("VIA CPU temperature monitor"); | |
351 | MODULE_LICENSE("GPL"); | |
352 | ||
353 | module_init(via_cputemp_init) | |
354 | module_exit(via_cputemp_exit) |