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935912c5 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
70c38772 HW |
2 | /* |
3 | * via-cputemp.c - Driver for VIA CPU core temperature monitoring | |
4 | * Copyright (C) 2009 VIA Technologies, Inc. | |
5 | * | |
6 | * based on existing coretemp.c, which is | |
7 | * | |
8 | * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> | |
70c38772 HW |
9 | */ |
10 | ||
edb8d53c JP |
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
12 | ||
70c38772 | 13 | #include <linux/module.h> |
70c38772 HW |
14 | #include <linux/init.h> |
15 | #include <linux/slab.h> | |
70c38772 | 16 | #include <linux/hwmon.h> |
764e043b | 17 | #include <linux/hwmon-vid.h> |
70c38772 HW |
18 | #include <linux/sysfs.h> |
19 | #include <linux/hwmon-sysfs.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/mutex.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/cpu.h> | |
25 | #include <asm/msr.h> | |
26 | #include <asm/processor.h> | |
267fc978 | 27 | #include <asm/cpu_device_id.h> |
70c38772 HW |
28 | |
29 | #define DRVNAME "via_cputemp" | |
30 | ||
f2799418 | 31 | enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME }; |
70c38772 HW |
32 | |
33 | /* | |
34 | * Functions declaration | |
35 | */ | |
36 | ||
37 | struct via_cputemp_data { | |
38 | struct device *hwmon_dev; | |
39 | const char *name; | |
764e043b | 40 | u8 vrm; |
70c38772 | 41 | u32 id; |
764e043b JD |
42 | u32 msr_temp; |
43 | u32 msr_vid; | |
70c38772 HW |
44 | }; |
45 | ||
46 | /* | |
47 | * Sysfs stuff | |
48 | */ | |
49 | ||
f74c24f8 GR |
50 | static ssize_t name_show(struct device *dev, struct device_attribute *devattr, |
51 | char *buf) | |
70c38772 HW |
52 | { |
53 | int ret; | |
54 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
55 | struct via_cputemp_data *data = dev_get_drvdata(dev); | |
56 | ||
57 | if (attr->index == SHOW_NAME) | |
58 | ret = sprintf(buf, "%s\n", data->name); | |
59 | else /* show label */ | |
60 | ret = sprintf(buf, "Core %d\n", data->id); | |
61 | return ret; | |
62 | } | |
63 | ||
f74c24f8 GR |
64 | static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
65 | char *buf) | |
70c38772 HW |
66 | { |
67 | struct via_cputemp_data *data = dev_get_drvdata(dev); | |
68 | u32 eax, edx; | |
69 | int err; | |
70 | ||
764e043b | 71 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
70c38772 HW |
72 | if (err) |
73 | return -EAGAIN; | |
74 | ||
75 | return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000); | |
76 | } | |
77 | ||
1664d7fd JL |
78 | static ssize_t cpu0_vid_show(struct device *dev, |
79 | struct device_attribute *devattr, char *buf) | |
764e043b JD |
80 | { |
81 | struct via_cputemp_data *data = dev_get_drvdata(dev); | |
82 | u32 eax, edx; | |
83 | int err; | |
84 | ||
85 | err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx); | |
86 | if (err) | |
87 | return -EAGAIN; | |
88 | ||
89 | return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm)); | |
90 | } | |
91 | ||
f74c24f8 GR |
92 | static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, SHOW_TEMP); |
93 | static SENSOR_DEVICE_ATTR_RO(temp1_label, name, SHOW_LABEL); | |
94 | static SENSOR_DEVICE_ATTR_RO(name, name, SHOW_NAME); | |
70c38772 HW |
95 | |
96 | static struct attribute *via_cputemp_attributes[] = { | |
97 | &sensor_dev_attr_name.dev_attr.attr, | |
98 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
99 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
100 | NULL | |
101 | }; | |
102 | ||
103 | static const struct attribute_group via_cputemp_group = { | |
104 | .attrs = via_cputemp_attributes, | |
105 | }; | |
106 | ||
764e043b | 107 | /* Optional attributes */ |
1664d7fd | 108 | static DEVICE_ATTR_RO(cpu0_vid); |
764e043b | 109 | |
6c931ae1 | 110 | static int via_cputemp_probe(struct platform_device *pdev) |
70c38772 HW |
111 | { |
112 | struct via_cputemp_data *data; | |
113 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); | |
114 | int err; | |
115 | u32 eax, edx; | |
116 | ||
505dc0cc GR |
117 | data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data), |
118 | GFP_KERNEL); | |
119 | if (!data) | |
120 | return -ENOMEM; | |
70c38772 HW |
121 | |
122 | data->id = pdev->id; | |
123 | data->name = "via_cputemp"; | |
124 | ||
e3a2d2be | 125 | if (c->x86 == 7) { |
764e043b | 126 | data->msr_temp = 0x1423; |
e3a2d2be | 127 | } else { |
128 | switch (c->x86_model) { | |
129 | case 0xA: | |
130 | /* C7 A */ | |
131 | case 0xD: | |
132 | /* C7 D */ | |
133 | data->msr_temp = 0x1169; | |
134 | data->msr_vid = 0x198; | |
135 | break; | |
136 | case 0xF: | |
137 | /* Nano */ | |
138 | data->msr_temp = 0x1423; | |
139 | break; | |
140 | default: | |
141 | return -ENODEV; | |
142 | } | |
70c38772 HW |
143 | } |
144 | ||
145 | /* test if we can access the TEMPERATURE MSR */ | |
764e043b | 146 | err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx); |
70c38772 HW |
147 | if (err) { |
148 | dev_err(&pdev->dev, | |
149 | "Unable to access TEMPERATURE MSR, giving up\n"); | |
505dc0cc | 150 | return err; |
70c38772 HW |
151 | } |
152 | ||
153 | platform_set_drvdata(pdev, data); | |
154 | ||
155 | err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group); | |
156 | if (err) | |
505dc0cc | 157 | return err; |
70c38772 | 158 | |
764e043b JD |
159 | if (data->msr_vid) |
160 | data->vrm = vid_which_vrm(); | |
161 | ||
162 | if (data->vrm) { | |
163 | err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid); | |
164 | if (err) | |
165 | goto exit_remove; | |
166 | } | |
167 | ||
70c38772 HW |
168 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
169 | if (IS_ERR(data->hwmon_dev)) { | |
170 | err = PTR_ERR(data->hwmon_dev); | |
171 | dev_err(&pdev->dev, "Class registration failed (%d)\n", | |
172 | err); | |
173 | goto exit_remove; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | ||
178 | exit_remove: | |
764e043b JD |
179 | if (data->vrm) |
180 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 | 181 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
70c38772 HW |
182 | return err; |
183 | } | |
184 | ||
281dfd0b | 185 | static int via_cputemp_remove(struct platform_device *pdev) |
70c38772 HW |
186 | { |
187 | struct via_cputemp_data *data = platform_get_drvdata(pdev); | |
188 | ||
189 | hwmon_device_unregister(data->hwmon_dev); | |
764e043b JD |
190 | if (data->vrm) |
191 | device_remove_file(&pdev->dev, &dev_attr_cpu0_vid); | |
70c38772 | 192 | sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group); |
70c38772 HW |
193 | return 0; |
194 | } | |
195 | ||
196 | static struct platform_driver via_cputemp_driver = { | |
197 | .driver = { | |
70c38772 HW |
198 | .name = DRVNAME, |
199 | }, | |
200 | .probe = via_cputemp_probe, | |
9e5e9b7a | 201 | .remove = via_cputemp_remove, |
70c38772 HW |
202 | }; |
203 | ||
204 | struct pdev_entry { | |
205 | struct list_head list; | |
206 | struct platform_device *pdev; | |
207 | unsigned int cpu; | |
208 | }; | |
209 | ||
210 | static LIST_HEAD(pdev_list); | |
211 | static DEFINE_MUTEX(pdev_list_mutex); | |
212 | ||
df60d701 | 213 | static int via_cputemp_online(unsigned int cpu) |
70c38772 HW |
214 | { |
215 | int err; | |
216 | struct platform_device *pdev; | |
217 | struct pdev_entry *pdev_entry; | |
218 | ||
219 | pdev = platform_device_alloc(DRVNAME, cpu); | |
220 | if (!pdev) { | |
221 | err = -ENOMEM; | |
edb8d53c | 222 | pr_err("Device allocation failed\n"); |
70c38772 HW |
223 | goto exit; |
224 | } | |
225 | ||
226 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
227 | if (!pdev_entry) { | |
228 | err = -ENOMEM; | |
229 | goto exit_device_put; | |
230 | } | |
231 | ||
232 | err = platform_device_add(pdev); | |
233 | if (err) { | |
edb8d53c | 234 | pr_err("Device addition failed (%d)\n", err); |
70c38772 HW |
235 | goto exit_device_free; |
236 | } | |
237 | ||
238 | pdev_entry->pdev = pdev; | |
239 | pdev_entry->cpu = cpu; | |
240 | mutex_lock(&pdev_list_mutex); | |
241 | list_add_tail(&pdev_entry->list, &pdev_list); | |
242 | mutex_unlock(&pdev_list_mutex); | |
243 | ||
244 | return 0; | |
245 | ||
246 | exit_device_free: | |
247 | kfree(pdev_entry); | |
248 | exit_device_put: | |
249 | platform_device_put(pdev); | |
250 | exit: | |
251 | return err; | |
252 | } | |
253 | ||
df60d701 | 254 | static int via_cputemp_down_prep(unsigned int cpu) |
70c38772 | 255 | { |
ae9e0ce7 JB |
256 | struct pdev_entry *p; |
257 | ||
70c38772 | 258 | mutex_lock(&pdev_list_mutex); |
ae9e0ce7 | 259 | list_for_each_entry(p, &pdev_list, list) { |
70c38772 HW |
260 | if (p->cpu == cpu) { |
261 | platform_device_unregister(p->pdev); | |
262 | list_del(&p->list); | |
ae9e0ce7 | 263 | mutex_unlock(&pdev_list_mutex); |
70c38772 | 264 | kfree(p); |
df60d701 | 265 | return 0; |
70c38772 HW |
266 | } |
267 | } | |
268 | mutex_unlock(&pdev_list_mutex); | |
df60d701 | 269 | return 0; |
70c38772 HW |
270 | } |
271 | ||
e273bd98 | 272 | static const struct x86_cpu_id __initconst cputemp_ids[] = { |
267fc978 AK |
273 | { X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */ |
274 | { X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */ | |
275 | { X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */ | |
e3a2d2be | 276 | { X86_VENDOR_CENTAUR, 7, X86_MODEL_ANY, }, |
267fc978 AK |
277 | {} |
278 | }; | |
279 | MODULE_DEVICE_TABLE(x86cpu, cputemp_ids); | |
280 | ||
df60d701 SAS |
281 | static enum cpuhp_state via_temp_online; |
282 | ||
70c38772 HW |
283 | static int __init via_cputemp_init(void) |
284 | { | |
df60d701 | 285 | int err; |
70c38772 | 286 | |
267fc978 AK |
287 | if (!x86_match_cpu(cputemp_ids)) |
288 | return -ENODEV; | |
70c38772 HW |
289 | |
290 | err = platform_driver_register(&via_cputemp_driver); | |
291 | if (err) | |
292 | goto exit; | |
293 | ||
df60d701 SAS |
294 | err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online", |
295 | via_cputemp_online, via_cputemp_down_prep); | |
296 | if (err < 0) | |
297 | goto exit_driver_unreg; | |
298 | via_temp_online = err; | |
ae9e0ce7 JB |
299 | |
300 | #ifndef CONFIG_HOTPLUG_CPU | |
70c38772 HW |
301 | if (list_empty(&pdev_list)) { |
302 | err = -ENODEV; | |
df60d701 | 303 | goto exit_hp_unreg; |
70c38772 | 304 | } |
ae9e0ce7 | 305 | #endif |
70c38772 HW |
306 | return 0; |
307 | ||
ae9e0ce7 | 308 | #ifndef CONFIG_HOTPLUG_CPU |
df60d701 SAS |
309 | exit_hp_unreg: |
310 | cpuhp_remove_state_nocalls(via_temp_online); | |
311 | #endif | |
70c38772 HW |
312 | exit_driver_unreg: |
313 | platform_driver_unregister(&via_cputemp_driver); | |
314 | exit: | |
315 | return err; | |
316 | } | |
317 | ||
318 | static void __exit via_cputemp_exit(void) | |
319 | { | |
df60d701 | 320 | cpuhp_remove_state(via_temp_online); |
70c38772 HW |
321 | platform_driver_unregister(&via_cputemp_driver); |
322 | } | |
323 | ||
324 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); | |
325 | MODULE_DESCRIPTION("VIA CPU temperature monitor"); | |
326 | MODULE_LICENSE("GPL"); | |
327 | ||
328 | module_init(via_cputemp_init) | |
329 | module_exit(via_cputemp_exit) |