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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 | ||
1664d7fd JL |
91 | static ssize_t cpu0_vid_show(struct device *dev, |
92 | struct device_attribute *devattr, char *buf) | |
764e043b JD |
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 | 121 | /* Optional attributes */ |
1664d7fd | 122 | static DEVICE_ATTR_RO(cpu0_vid); |
764e043b | 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 | ||
e3a2d2be | 139 | if (c->x86 == 7) { |
764e043b | 140 | data->msr_temp = 0x1423; |
e3a2d2be | 141 | } else { |
142 | switch (c->x86_model) { | |
143 | case 0xA: | |
144 | /* C7 A */ | |
145 | case 0xD: | |
146 | /* C7 D */ | |
147 | data->msr_temp = 0x1169; | |
148 | data->msr_vid = 0x198; | |
149 | break; | |
150 | case 0xF: | |
151 | /* Nano */ | |
152 | data->msr_temp = 0x1423; | |
153 | break; | |
154 | default: | |
155 | return -ENODEV; | |
156 | } | |
70c38772 HW |
157 | } |
158 | ||
159 | /* test if we can access the TEMPERATURE MSR */ | |
764e043b | 160 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
70c38772 HW |
161 | if (err) { |
162 | dev_err(&pdev->dev, | |
163 | "Unable to access TEMPERATURE MSR, giving up\n"); | |
505dc0cc | 164 | return err; |
70c38772 HW |
165 | } |
166 | ||
167 | platform_set_drvdata(pdev, data); | |
168 | ||
169 | err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group); | |
170 | if (err) | |
505dc0cc | 171 | return err; |
70c38772 | 172 | |
764e043b JD |
173 | if (data->msr_vid) |
174 | data->vrm = vid_which_vrm(); | |
175 | ||
176 | if (data->vrm) { | |
177 | err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid); | |
178 | if (err) | |
179 | goto exit_remove; | |
180 | } | |
181 | ||
70c38772 HW |
182 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
183 | if (IS_ERR(data->hwmon_dev)) { | |
184 | err = PTR_ERR(data->hwmon_dev); | |
185 | dev_err(&pdev->dev, "Class registration failed (%d)\n", | |
186 | err); | |
187 | goto exit_remove; | |
188 | } | |
189 | ||
190 | return 0; | |
191 | ||
192 | exit_remove: | |
764e043b JD |
193 | if (data->vrm) |
194 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 | 195 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
70c38772 HW |
196 | return err; |
197 | } | |
198 | ||
281dfd0b | 199 | static int via_cputemp_remove(struct platform_device *pdev) |
70c38772 HW |
200 | { |
201 | struct via_cputemp_data *data = platform_get_drvdata(pdev); | |
202 | ||
203 | hwmon_device_unregister(data->hwmon_dev); | |
764e043b JD |
204 | if (data->vrm) |
205 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 | 206 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
70c38772 HW |
207 | return 0; |
208 | } | |
209 | ||
210 | static struct platform_driver via_cputemp_driver = { | |
211 | .driver = { | |
70c38772 HW |
212 | .name = DRVNAME, |
213 | }, | |
214 | .probe = via_cputemp_probe, | |
9e5e9b7a | 215 | .remove = via_cputemp_remove, |
70c38772 HW |
216 | }; |
217 | ||
218 | struct pdev_entry { | |
219 | struct list_head list; | |
220 | struct platform_device *pdev; | |
221 | unsigned int cpu; | |
222 | }; | |
223 | ||
224 | static LIST_HEAD(pdev_list); | |
225 | static DEFINE_MUTEX(pdev_list_mutex); | |
226 | ||
df60d701 | 227 | static int via_cputemp_online(unsigned int cpu) |
70c38772 HW |
228 | { |
229 | int err; | |
230 | struct platform_device *pdev; | |
231 | struct pdev_entry *pdev_entry; | |
232 | ||
233 | pdev = platform_device_alloc(DRVNAME, cpu); | |
234 | if (!pdev) { | |
235 | err = -ENOMEM; | |
edb8d53c | 236 | pr_err("Device allocation failed\n"); |
70c38772 HW |
237 | goto exit; |
238 | } | |
239 | ||
240 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
241 | if (!pdev_entry) { | |
242 | err = -ENOMEM; | |
243 | goto exit_device_put; | |
244 | } | |
245 | ||
246 | err = platform_device_add(pdev); | |
247 | if (err) { | |
edb8d53c | 248 | pr_err("Device addition failed (%d)\n", err); |
70c38772 HW |
249 | goto exit_device_free; |
250 | } | |
251 | ||
252 | pdev_entry->pdev = pdev; | |
253 | pdev_entry->cpu = cpu; | |
254 | mutex_lock(&pdev_list_mutex); | |
255 | list_add_tail(&pdev_entry->list, &pdev_list); | |
256 | mutex_unlock(&pdev_list_mutex); | |
257 | ||
258 | return 0; | |
259 | ||
260 | exit_device_free: | |
261 | kfree(pdev_entry); | |
262 | exit_device_put: | |
263 | platform_device_put(pdev); | |
264 | exit: | |
265 | return err; | |
266 | } | |
267 | ||
df60d701 | 268 | static int via_cputemp_down_prep(unsigned int cpu) |
70c38772 | 269 | { |
ae9e0ce7 JB |
270 | struct pdev_entry *p; |
271 | ||
70c38772 | 272 | mutex_lock(&pdev_list_mutex); |
ae9e0ce7 | 273 | list_for_each_entry(p, &pdev_list, list) { |
70c38772 HW |
274 | if (p->cpu == cpu) { |
275 | platform_device_unregister(p->pdev); | |
276 | list_del(&p->list); | |
ae9e0ce7 | 277 | mutex_unlock(&pdev_list_mutex); |
70c38772 | 278 | kfree(p); |
df60d701 | 279 | return 0; |
70c38772 HW |
280 | } |
281 | } | |
282 | mutex_unlock(&pdev_list_mutex); | |
df60d701 | 283 | return 0; |
70c38772 HW |
284 | } |
285 | ||
e273bd98 | 286 | static const struct x86_cpu_id __initconst cputemp_ids[] = { |
267fc978 AK |
287 | { X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */ |
288 | { X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */ | |
289 | { X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */ | |
e3a2d2be | 290 | { X86_VENDOR_CENTAUR, 7, X86_MODEL_ANY, }, |
267fc978 AK |
291 | {} |
292 | }; | |
293 | MODULE_DEVICE_TABLE(x86cpu, cputemp_ids); | |
294 | ||
df60d701 SAS |
295 | static enum cpuhp_state via_temp_online; |
296 | ||
70c38772 HW |
297 | static int __init via_cputemp_init(void) |
298 | { | |
df60d701 | 299 | int err; |
70c38772 | 300 | |
267fc978 AK |
301 | if (!x86_match_cpu(cputemp_ids)) |
302 | return -ENODEV; | |
70c38772 HW |
303 | |
304 | err = platform_driver_register(&via_cputemp_driver); | |
305 | if (err) | |
306 | goto exit; | |
307 | ||
df60d701 SAS |
308 | err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online", |
309 | via_cputemp_online, via_cputemp_down_prep); | |
310 | if (err < 0) | |
311 | goto exit_driver_unreg; | |
312 | via_temp_online = err; | |
ae9e0ce7 JB |
313 | |
314 | #ifndef CONFIG_HOTPLUG_CPU | |
70c38772 HW |
315 | if (list_empty(&pdev_list)) { |
316 | err = -ENODEV; | |
df60d701 | 317 | goto exit_hp_unreg; |
70c38772 | 318 | } |
ae9e0ce7 | 319 | #endif |
70c38772 HW |
320 | return 0; |
321 | ||
ae9e0ce7 | 322 | #ifndef CONFIG_HOTPLUG_CPU |
df60d701 SAS |
323 | exit_hp_unreg: |
324 | cpuhp_remove_state_nocalls(via_temp_online); | |
325 | #endif | |
70c38772 HW |
326 | exit_driver_unreg: |
327 | platform_driver_unregister(&via_cputemp_driver); | |
328 | exit: | |
329 | return err; | |
330 | } | |
331 | ||
332 | static void __exit via_cputemp_exit(void) | |
333 | { | |
df60d701 | 334 | cpuhp_remove_state(via_temp_online); |
70c38772 HW |
335 | platform_driver_unregister(&via_cputemp_driver); |
336 | } | |
337 | ||
338 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); | |
339 | MODULE_DESCRIPTION("VIA CPU temperature monitor"); | |
340 | MODULE_LICENSE("GPL"); | |
341 | ||
342 | module_init(via_cputemp_init) | |
343 | module_exit(via_cputemp_exit) |