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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 HW |
29 | #include <linux/hwmon.h> |
30 | #include <linux/sysfs.h> | |
31 | #include <linux/hwmon-sysfs.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/mutex.h> | |
34 | #include <linux/list.h> | |
35 | #include <linux/platform_device.h> | |
36 | #include <linux/cpu.h> | |
37 | #include <asm/msr.h> | |
38 | #include <asm/processor.h> | |
39 | ||
40 | #define DRVNAME "via_cputemp" | |
41 | ||
f2799418 | 42 | enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME }; |
70c38772 HW |
43 | |
44 | /* | |
45 | * Functions declaration | |
46 | */ | |
47 | ||
48 | struct via_cputemp_data { | |
49 | struct device *hwmon_dev; | |
50 | const char *name; | |
51 | u32 id; | |
52 | u32 msr; | |
53 | }; | |
54 | ||
55 | /* | |
56 | * Sysfs stuff | |
57 | */ | |
58 | ||
59 | static ssize_t show_name(struct device *dev, struct device_attribute | |
60 | *devattr, char *buf) | |
61 | { | |
62 | int ret; | |
63 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
64 | struct via_cputemp_data *data = dev_get_drvdata(dev); | |
65 | ||
66 | if (attr->index == SHOW_NAME) | |
67 | ret = sprintf(buf, "%s\n", data->name); | |
68 | else /* show label */ | |
69 | ret = sprintf(buf, "Core %d\n", data->id); | |
70 | return ret; | |
71 | } | |
72 | ||
73 | static ssize_t show_temp(struct device *dev, | |
74 | struct device_attribute *devattr, char *buf) | |
75 | { | |
76 | struct via_cputemp_data *data = dev_get_drvdata(dev); | |
77 | u32 eax, edx; | |
78 | int err; | |
79 | ||
80 | err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx); | |
81 | if (err) | |
82 | return -EAGAIN; | |
83 | ||
84 | return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); | |
85 | } | |
86 | ||
87 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, | |
88 | SHOW_TEMP); | |
89 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
90 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
91 | ||
92 | static struct attribute *via_cputemp_attributes[] = { | |
93 | &sensor_dev_attr_name.dev_attr.attr, | |
94 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
95 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
96 | NULL | |
97 | }; | |
98 | ||
99 | static const struct attribute_group via_cputemp_group = { | |
100 | .attrs = via_cputemp_attributes, | |
101 | }; | |
102 | ||
103 | static int __devinit via_cputemp_probe(struct platform_device *pdev) | |
104 | { | |
105 | struct via_cputemp_data *data; | |
106 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); | |
107 | int err; | |
108 | u32 eax, edx; | |
109 | ||
110 | data = kzalloc(sizeof(struct via_cputemp_data), GFP_KERNEL); | |
111 | if (!data) { | |
112 | err = -ENOMEM; | |
113 | dev_err(&pdev->dev, "Out of memory\n"); | |
114 | goto exit; | |
115 | } | |
116 | ||
117 | data->id = pdev->id; | |
118 | data->name = "via_cputemp"; | |
119 | ||
120 | switch (c->x86_model) { | |
121 | case 0xA: | |
122 | /* C7 A */ | |
123 | case 0xD: | |
124 | /* C7 D */ | |
125 | data->msr = 0x1169; | |
126 | break; | |
127 | case 0xF: | |
128 | /* Nano */ | |
129 | data->msr = 0x1423; | |
130 | break; | |
131 | default: | |
132 | err = -ENODEV; | |
133 | goto exit_free; | |
134 | } | |
135 | ||
136 | /* test if we can access the TEMPERATURE MSR */ | |
137 | err = rdmsr_safe_on_cpu(data->id, data->msr, &eax, &edx); | |
138 | if (err) { | |
139 | dev_err(&pdev->dev, | |
140 | "Unable to access TEMPERATURE MSR, giving up\n"); | |
141 | goto exit_free; | |
142 | } | |
143 | ||
144 | platform_set_drvdata(pdev, data); | |
145 | ||
146 | err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group); | |
147 | if (err) | |
148 | goto exit_free; | |
149 | ||
150 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
151 | if (IS_ERR(data->hwmon_dev)) { | |
152 | err = PTR_ERR(data->hwmon_dev); | |
153 | dev_err(&pdev->dev, "Class registration failed (%d)\n", | |
154 | err); | |
155 | goto exit_remove; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | ||
160 | exit_remove: | |
161 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); | |
162 | exit_free: | |
163 | platform_set_drvdata(pdev, NULL); | |
164 | kfree(data); | |
165 | exit: | |
166 | return err; | |
167 | } | |
168 | ||
169 | static int __devexit via_cputemp_remove(struct platform_device *pdev) | |
170 | { | |
171 | struct via_cputemp_data *data = platform_get_drvdata(pdev); | |
172 | ||
173 | hwmon_device_unregister(data->hwmon_dev); | |
174 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); | |
175 | platform_set_drvdata(pdev, NULL); | |
176 | kfree(data); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | static struct platform_driver via_cputemp_driver = { | |
181 | .driver = { | |
182 | .owner = THIS_MODULE, | |
183 | .name = DRVNAME, | |
184 | }, | |
185 | .probe = via_cputemp_probe, | |
186 | .remove = __devexit_p(via_cputemp_remove), | |
187 | }; | |
188 | ||
189 | struct pdev_entry { | |
190 | struct list_head list; | |
191 | struct platform_device *pdev; | |
192 | unsigned int cpu; | |
193 | }; | |
194 | ||
195 | static LIST_HEAD(pdev_list); | |
196 | static DEFINE_MUTEX(pdev_list_mutex); | |
197 | ||
198 | static int __cpuinit via_cputemp_device_add(unsigned int cpu) | |
199 | { | |
200 | int err; | |
201 | struct platform_device *pdev; | |
202 | struct pdev_entry *pdev_entry; | |
203 | ||
204 | pdev = platform_device_alloc(DRVNAME, cpu); | |
205 | if (!pdev) { | |
206 | err = -ENOMEM; | |
edb8d53c | 207 | pr_err("Device allocation failed\n"); |
70c38772 HW |
208 | goto exit; |
209 | } | |
210 | ||
211 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
212 | if (!pdev_entry) { | |
213 | err = -ENOMEM; | |
214 | goto exit_device_put; | |
215 | } | |
216 | ||
217 | err = platform_device_add(pdev); | |
218 | if (err) { | |
edb8d53c | 219 | pr_err("Device addition failed (%d)\n", err); |
70c38772 HW |
220 | goto exit_device_free; |
221 | } | |
222 | ||
223 | pdev_entry->pdev = pdev; | |
224 | pdev_entry->cpu = cpu; | |
225 | mutex_lock(&pdev_list_mutex); | |
226 | list_add_tail(&pdev_entry->list, &pdev_list); | |
227 | mutex_unlock(&pdev_list_mutex); | |
228 | ||
229 | return 0; | |
230 | ||
231 | exit_device_free: | |
232 | kfree(pdev_entry); | |
233 | exit_device_put: | |
234 | platform_device_put(pdev); | |
235 | exit: | |
236 | return err; | |
237 | } | |
238 | ||
a5f42a6b | 239 | static void __cpuinit via_cputemp_device_remove(unsigned int cpu) |
70c38772 | 240 | { |
ae9e0ce7 JB |
241 | struct pdev_entry *p; |
242 | ||
70c38772 | 243 | mutex_lock(&pdev_list_mutex); |
ae9e0ce7 | 244 | list_for_each_entry(p, &pdev_list, list) { |
70c38772 HW |
245 | if (p->cpu == cpu) { |
246 | platform_device_unregister(p->pdev); | |
247 | list_del(&p->list); | |
ae9e0ce7 | 248 | mutex_unlock(&pdev_list_mutex); |
70c38772 | 249 | kfree(p); |
ae9e0ce7 | 250 | return; |
70c38772 HW |
251 | } |
252 | } | |
253 | mutex_unlock(&pdev_list_mutex); | |
254 | } | |
255 | ||
256 | static int __cpuinit via_cputemp_cpu_callback(struct notifier_block *nfb, | |
257 | unsigned long action, void *hcpu) | |
258 | { | |
259 | unsigned int cpu = (unsigned long) hcpu; | |
260 | ||
261 | switch (action) { | |
262 | case CPU_ONLINE: | |
263 | case CPU_DOWN_FAILED: | |
264 | via_cputemp_device_add(cpu); | |
265 | break; | |
266 | case CPU_DOWN_PREPARE: | |
267 | via_cputemp_device_remove(cpu); | |
268 | break; | |
269 | } | |
270 | return NOTIFY_OK; | |
271 | } | |
272 | ||
273 | static struct notifier_block via_cputemp_cpu_notifier __refdata = { | |
274 | .notifier_call = via_cputemp_cpu_callback, | |
275 | }; | |
70c38772 HW |
276 | |
277 | static int __init via_cputemp_init(void) | |
278 | { | |
279 | int i, err; | |
70c38772 HW |
280 | |
281 | if (cpu_data(0).x86_vendor != X86_VENDOR_CENTAUR) { | |
282 | printk(KERN_DEBUG DRVNAME ": Not a VIA CPU\n"); | |
283 | err = -ENODEV; | |
284 | goto exit; | |
285 | } | |
286 | ||
287 | err = platform_driver_register(&via_cputemp_driver); | |
288 | if (err) | |
289 | goto exit; | |
290 | ||
291 | for_each_online_cpu(i) { | |
292 | struct cpuinfo_x86 *c = &cpu_data(i); | |
293 | ||
294 | if (c->x86 != 6) | |
295 | continue; | |
296 | ||
297 | if (c->x86_model < 0x0a) | |
298 | continue; | |
299 | ||
300 | if (c->x86_model > 0x0f) { | |
edb8d53c | 301 | pr_warn("Unknown CPU model 0x%x\n", c->x86_model); |
70c38772 HW |
302 | continue; |
303 | } | |
304 | ||
ae9e0ce7 | 305 | via_cputemp_device_add(i); |
70c38772 | 306 | } |
ae9e0ce7 JB |
307 | |
308 | #ifndef CONFIG_HOTPLUG_CPU | |
70c38772 HW |
309 | if (list_empty(&pdev_list)) { |
310 | err = -ENODEV; | |
311 | goto exit_driver_unreg; | |
312 | } | |
ae9e0ce7 | 313 | #endif |
70c38772 | 314 | |
70c38772 | 315 | register_hotcpu_notifier(&via_cputemp_cpu_notifier); |
70c38772 HW |
316 | return 0; |
317 | ||
ae9e0ce7 | 318 | #ifndef CONFIG_HOTPLUG_CPU |
70c38772 HW |
319 | exit_driver_unreg: |
320 | platform_driver_unregister(&via_cputemp_driver); | |
ae9e0ce7 | 321 | #endif |
70c38772 HW |
322 | exit: |
323 | return err; | |
324 | } | |
325 | ||
326 | static void __exit via_cputemp_exit(void) | |
327 | { | |
328 | struct pdev_entry *p, *n; | |
17c10d61 | 329 | |
70c38772 | 330 | unregister_hotcpu_notifier(&via_cputemp_cpu_notifier); |
70c38772 HW |
331 | mutex_lock(&pdev_list_mutex); |
332 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
333 | platform_device_unregister(p->pdev); | |
334 | list_del(&p->list); | |
335 | kfree(p); | |
336 | } | |
337 | mutex_unlock(&pdev_list_mutex); | |
338 | platform_driver_unregister(&via_cputemp_driver); | |
339 | } | |
340 | ||
341 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); | |
342 | MODULE_DESCRIPTION("VIA CPU temperature monitor"); | |
343 | MODULE_LICENSE("GPL"); | |
344 | ||
345 | module_init(via_cputemp_init) | |
346 | module_exit(via_cputemp_exit) |