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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 | ||
f74c24f8 GR |
63 | static ssize_t name_show(struct device *dev, struct device_attribute *devattr, |
64 | char *buf) | |
70c38772 HW |
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 | ||
f74c24f8 GR |
77 | static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
78 | char *buf) | |
70c38772 HW |
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 | ||
f74c24f8 GR |
105 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, SHOW_TEMP); |
106 | static SENSOR_DEVICE_ATTR_RO(temp1_label, name, SHOW_LABEL); | |
107 | static SENSOR_DEVICE_ATTR_RO(name, name, SHOW_NAME); | |
70c38772 HW |
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 | 120 | /* Optional attributes */ |
1664d7fd | 121 | static DEVICE_ATTR_RO(cpu0_vid); |
764e043b | 122 | |
6c931ae1 | 123 | static int via_cputemp_probe(struct platform_device *pdev) |
70c38772 HW |
124 | { |
125 | struct via_cputemp_data *data; | |
126 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); | |
127 | int err; | |
128 | u32 eax, edx; | |
129 | ||
505dc0cc GR |
130 | data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data), |
131 | GFP_KERNEL); | |
132 | if (!data) | |
133 | return -ENOMEM; | |
70c38772 HW |
134 | |
135 | data->id = pdev->id; | |
136 | data->name = "via_cputemp"; | |
137 | ||
e3a2d2be | 138 | if (c->x86 == 7) { |
764e043b | 139 | data->msr_temp = 0x1423; |
e3a2d2be | 140 | } else { |
141 | switch (c->x86_model) { | |
142 | case 0xA: | |
143 | /* C7 A */ | |
144 | case 0xD: | |
145 | /* C7 D */ | |
146 | data->msr_temp = 0x1169; | |
147 | data->msr_vid = 0x198; | |
148 | break; | |
149 | case 0xF: | |
150 | /* Nano */ | |
151 | data->msr_temp = 0x1423; | |
152 | break; | |
153 | default: | |
154 | return -ENODEV; | |
155 | } | |
70c38772 HW |
156 | } |
157 | ||
158 | /* test if we can access the TEMPERATURE MSR */ | |
764e043b | 159 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
70c38772 HW |
160 | if (err) { |
161 | dev_err(&pdev->dev, | |
162 | "Unable to access TEMPERATURE MSR, giving up\n"); | |
505dc0cc | 163 | return err; |
70c38772 HW |
164 | } |
165 | ||
166 | platform_set_drvdata(pdev, data); | |
167 | ||
168 | err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group); | |
169 | if (err) | |
505dc0cc | 170 | return err; |
70c38772 | 171 | |
764e043b JD |
172 | if (data->msr_vid) |
173 | data->vrm = vid_which_vrm(); | |
174 | ||
175 | if (data->vrm) { | |
176 | err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid); | |
177 | if (err) | |
178 | goto exit_remove; | |
179 | } | |
180 | ||
70c38772 HW |
181 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
182 | if (IS_ERR(data->hwmon_dev)) { | |
183 | err = PTR_ERR(data->hwmon_dev); | |
184 | dev_err(&pdev->dev, "Class registration failed (%d)\n", | |
185 | err); | |
186 | goto exit_remove; | |
187 | } | |
188 | ||
189 | return 0; | |
190 | ||
191 | exit_remove: | |
764e043b JD |
192 | if (data->vrm) |
193 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 | 194 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
70c38772 HW |
195 | return err; |
196 | } | |
197 | ||
281dfd0b | 198 | static int via_cputemp_remove(struct platform_device *pdev) |
70c38772 HW |
199 | { |
200 | struct via_cputemp_data *data = platform_get_drvdata(pdev); | |
201 | ||
202 | hwmon_device_unregister(data->hwmon_dev); | |
764e043b JD |
203 | if (data->vrm) |
204 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 | 205 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
70c38772 HW |
206 | return 0; |
207 | } | |
208 | ||
209 | static struct platform_driver via_cputemp_driver = { | |
210 | .driver = { | |
70c38772 HW |
211 | .name = DRVNAME, |
212 | }, | |
213 | .probe = via_cputemp_probe, | |
9e5e9b7a | 214 | .remove = via_cputemp_remove, |
70c38772 HW |
215 | }; |
216 | ||
217 | struct pdev_entry { | |
218 | struct list_head list; | |
219 | struct platform_device *pdev; | |
220 | unsigned int cpu; | |
221 | }; | |
222 | ||
223 | static LIST_HEAD(pdev_list); | |
224 | static DEFINE_MUTEX(pdev_list_mutex); | |
225 | ||
df60d701 | 226 | static int via_cputemp_online(unsigned int cpu) |
70c38772 HW |
227 | { |
228 | int err; | |
229 | struct platform_device *pdev; | |
230 | struct pdev_entry *pdev_entry; | |
231 | ||
232 | pdev = platform_device_alloc(DRVNAME, cpu); | |
233 | if (!pdev) { | |
234 | err = -ENOMEM; | |
edb8d53c | 235 | pr_err("Device allocation failed\n"); |
70c38772 HW |
236 | goto exit; |
237 | } | |
238 | ||
239 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
240 | if (!pdev_entry) { | |
241 | err = -ENOMEM; | |
242 | goto exit_device_put; | |
243 | } | |
244 | ||
245 | err = platform_device_add(pdev); | |
246 | if (err) { | |
edb8d53c | 247 | pr_err("Device addition failed (%d)\n", err); |
70c38772 HW |
248 | goto exit_device_free; |
249 | } | |
250 | ||
251 | pdev_entry->pdev = pdev; | |
252 | pdev_entry->cpu = cpu; | |
253 | mutex_lock(&pdev_list_mutex); | |
254 | list_add_tail(&pdev_entry->list, &pdev_list); | |
255 | mutex_unlock(&pdev_list_mutex); | |
256 | ||
257 | return 0; | |
258 | ||
259 | exit_device_free: | |
260 | kfree(pdev_entry); | |
261 | exit_device_put: | |
262 | platform_device_put(pdev); | |
263 | exit: | |
264 | return err; | |
265 | } | |
266 | ||
df60d701 | 267 | static int via_cputemp_down_prep(unsigned int cpu) |
70c38772 | 268 | { |
ae9e0ce7 JB |
269 | struct pdev_entry *p; |
270 | ||
70c38772 | 271 | mutex_lock(&pdev_list_mutex); |
ae9e0ce7 | 272 | list_for_each_entry(p, &pdev_list, list) { |
70c38772 HW |
273 | if (p->cpu == cpu) { |
274 | platform_device_unregister(p->pdev); | |
275 | list_del(&p->list); | |
ae9e0ce7 | 276 | mutex_unlock(&pdev_list_mutex); |
70c38772 | 277 | kfree(p); |
df60d701 | 278 | return 0; |
70c38772 HW |
279 | } |
280 | } | |
281 | mutex_unlock(&pdev_list_mutex); | |
df60d701 | 282 | return 0; |
70c38772 HW |
283 | } |
284 | ||
e273bd98 | 285 | static const struct x86_cpu_id __initconst cputemp_ids[] = { |
267fc978 AK |
286 | { X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */ |
287 | { X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */ | |
288 | { X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */ | |
e3a2d2be | 289 | { X86_VENDOR_CENTAUR, 7, X86_MODEL_ANY, }, |
267fc978 AK |
290 | {} |
291 | }; | |
292 | MODULE_DEVICE_TABLE(x86cpu, cputemp_ids); | |
293 | ||
df60d701 SAS |
294 | static enum cpuhp_state via_temp_online; |
295 | ||
70c38772 HW |
296 | static int __init via_cputemp_init(void) |
297 | { | |
df60d701 | 298 | int err; |
70c38772 | 299 | |
267fc978 AK |
300 | if (!x86_match_cpu(cputemp_ids)) |
301 | return -ENODEV; | |
70c38772 HW |
302 | |
303 | err = platform_driver_register(&via_cputemp_driver); | |
304 | if (err) | |
305 | goto exit; | |
306 | ||
df60d701 SAS |
307 | err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online", |
308 | via_cputemp_online, via_cputemp_down_prep); | |
309 | if (err < 0) | |
310 | goto exit_driver_unreg; | |
311 | via_temp_online = err; | |
ae9e0ce7 JB |
312 | |
313 | #ifndef CONFIG_HOTPLUG_CPU | |
70c38772 HW |
314 | if (list_empty(&pdev_list)) { |
315 | err = -ENODEV; | |
df60d701 | 316 | goto exit_hp_unreg; |
70c38772 | 317 | } |
ae9e0ce7 | 318 | #endif |
70c38772 HW |
319 | return 0; |
320 | ||
ae9e0ce7 | 321 | #ifndef CONFIG_HOTPLUG_CPU |
df60d701 SAS |
322 | exit_hp_unreg: |
323 | cpuhp_remove_state_nocalls(via_temp_online); | |
324 | #endif | |
70c38772 HW |
325 | exit_driver_unreg: |
326 | platform_driver_unregister(&via_cputemp_driver); | |
327 | exit: | |
328 | return err; | |
329 | } | |
330 | ||
331 | static void __exit via_cputemp_exit(void) | |
332 | { | |
df60d701 | 333 | cpuhp_remove_state(via_temp_online); |
70c38772 HW |
334 | platform_driver_unregister(&via_cputemp_driver); |
335 | } | |
336 | ||
337 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); | |
338 | MODULE_DESCRIPTION("VIA CPU temperature monitor"); | |
339 | MODULE_LICENSE("GPL"); | |
340 | ||
341 | module_init(via_cputemp_init) | |
342 | module_exit(via_cputemp_exit) |