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1// SPDX-License-Identifier: GPL-2.0-only
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>
9 */
10
11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/hwmon.h>
17#include <linux/hwmon-vid.h>
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>
27#include <asm/cpu_device_id.h>
28
29#define DRVNAME "via_cputemp"
30
31enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
32
33/*
34 * Functions declaration
35 */
36
37struct via_cputemp_data {
38 struct device *hwmon_dev;
39 const char *name;
40 u8 vrm;
41 u32 id;
42 u32 msr_temp;
43 u32 msr_vid;
44};
45
46/*
47 * Sysfs stuff
48 */
49
50static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
51 char *buf)
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
64static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
65 char *buf)
66{
67 struct via_cputemp_data *data = dev_get_drvdata(dev);
68 u32 eax, edx;
69 int err;
70
71 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
72 if (err)
73 return -EAGAIN;
74
75 return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
76}
77
78static ssize_t cpu0_vid_show(struct device *dev,
79 struct device_attribute *devattr, char *buf)
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
92static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, SHOW_TEMP);
93static SENSOR_DEVICE_ATTR_RO(temp1_label, name, SHOW_LABEL);
94static SENSOR_DEVICE_ATTR_RO(name, name, SHOW_NAME);
95
96static 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
103static const struct attribute_group via_cputemp_group = {
104 .attrs = via_cputemp_attributes,
105};
106
107/* Optional attributes */
108static DEVICE_ATTR_RO(cpu0_vid);
109
110static int via_cputemp_probe(struct platform_device *pdev)
111{
112 struct via_cputemp_data *data;
113 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
114 int err;
115 u32 eax, edx;
116
117 data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data),
118 GFP_KERNEL);
119 if (!data)
120 return -ENOMEM;
121
122 data->id = pdev->id;
123 data->name = "via_cputemp";
124
125 if (c->x86 == 7) {
126 data->msr_temp = 0x1423;
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 }
143 }
144
145 /* test if we can access the TEMPERATURE MSR */
146 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
147 if (err) {
148 dev_err(&pdev->dev,
149 "Unable to access TEMPERATURE MSR, giving up\n");
150 return err;
151 }
152
153 platform_set_drvdata(pdev, data);
154
155 err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
156 if (err)
157 return err;
158
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
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
178exit_remove:
179 if (data->vrm)
180 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
181 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
182 return err;
183}
184
185static void via_cputemp_remove(struct platform_device *pdev)
186{
187 struct via_cputemp_data *data = platform_get_drvdata(pdev);
188
189 hwmon_device_unregister(data->hwmon_dev);
190 if (data->vrm)
191 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
192 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
193}
194
195static struct platform_driver via_cputemp_driver = {
196 .driver = {
197 .name = DRVNAME,
198 },
199 .probe = via_cputemp_probe,
200 .remove_new = via_cputemp_remove,
201};
202
203struct pdev_entry {
204 struct list_head list;
205 struct platform_device *pdev;
206 unsigned int cpu;
207};
208
209static LIST_HEAD(pdev_list);
210static DEFINE_MUTEX(pdev_list_mutex);
211
212static int via_cputemp_online(unsigned int cpu)
213{
214 int err;
215 struct platform_device *pdev;
216 struct pdev_entry *pdev_entry;
217
218 pdev = platform_device_alloc(DRVNAME, cpu);
219 if (!pdev) {
220 err = -ENOMEM;
221 pr_err("Device allocation failed\n");
222 goto exit;
223 }
224
225 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
226 if (!pdev_entry) {
227 err = -ENOMEM;
228 goto exit_device_put;
229 }
230
231 err = platform_device_add(pdev);
232 if (err) {
233 pr_err("Device addition failed (%d)\n", err);
234 goto exit_device_free;
235 }
236
237 pdev_entry->pdev = pdev;
238 pdev_entry->cpu = cpu;
239 mutex_lock(&pdev_list_mutex);
240 list_add_tail(&pdev_entry->list, &pdev_list);
241 mutex_unlock(&pdev_list_mutex);
242
243 return 0;
244
245exit_device_free:
246 kfree(pdev_entry);
247exit_device_put:
248 platform_device_put(pdev);
249exit:
250 return err;
251}
252
253static int via_cputemp_down_prep(unsigned int cpu)
254{
255 struct pdev_entry *p;
256
257 mutex_lock(&pdev_list_mutex);
258 list_for_each_entry(p, &pdev_list, list) {
259 if (p->cpu == cpu) {
260 platform_device_unregister(p->pdev);
261 list_del(&p->list);
262 mutex_unlock(&pdev_list_mutex);
263 kfree(p);
264 return 0;
265 }
266 }
267 mutex_unlock(&pdev_list_mutex);
268 return 0;
269}
270
271static const struct x86_cpu_id __initconst cputemp_ids[] = {
272 X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_A, NULL),
273 X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_C7_D, NULL),
274 X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 6, X86_CENTAUR_FAM6_NANO, NULL),
275 X86_MATCH_VENDOR_FAM_MODEL(CENTAUR, 7, X86_MODEL_ANY, NULL),
276 {}
277};
278MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
279
280static enum cpuhp_state via_temp_online;
281
282static int __init via_cputemp_init(void)
283{
284 int err;
285
286 if (!x86_match_cpu(cputemp_ids))
287 return -ENODEV;
288
289 err = platform_driver_register(&via_cputemp_driver);
290 if (err)
291 goto exit;
292
293 err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online",
294 via_cputemp_online, via_cputemp_down_prep);
295 if (err < 0)
296 goto exit_driver_unreg;
297 via_temp_online = err;
298
299#ifndef CONFIG_HOTPLUG_CPU
300 if (list_empty(&pdev_list)) {
301 err = -ENODEV;
302 goto exit_hp_unreg;
303 }
304#endif
305 return 0;
306
307#ifndef CONFIG_HOTPLUG_CPU
308exit_hp_unreg:
309 cpuhp_remove_state_nocalls(via_temp_online);
310#endif
311exit_driver_unreg:
312 platform_driver_unregister(&via_cputemp_driver);
313exit:
314 return err;
315}
316
317static void __exit via_cputemp_exit(void)
318{
319 cpuhp_remove_state(via_temp_online);
320 platform_driver_unregister(&via_cputemp_driver);
321}
322
323MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
324MODULE_DESCRIPTION("VIA CPU temperature monitor");
325MODULE_LICENSE("GPL");
326
327module_init(via_cputemp_init)
328module_exit(via_cputemp_exit)
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <linux/hwmon.h>
30#include <linux/hwmon-vid.h>
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>
40#include <asm/cpu_device_id.h>
41
42#define DRVNAME "via_cputemp"
43
44enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
45
46/*
47 * Functions declaration
48 */
49
50struct via_cputemp_data {
51 struct device *hwmon_dev;
52 const char *name;
53 u8 vrm;
54 u32 id;
55 u32 msr_temp;
56 u32 msr_vid;
57};
58
59/*
60 * Sysfs stuff
61 */
62
63static 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
77static 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
84 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
85 if (err)
86 return -EAGAIN;
87
88 return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
89}
90
91static ssize_t show_cpu_vid(struct device *dev,
92 struct device_attribute *devattr, char *buf)
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
105static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
106 SHOW_TEMP);
107static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
108static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
109
110static 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
117static const struct attribute_group via_cputemp_group = {
118 .attrs = via_cputemp_attributes,
119};
120
121/* Optional attributes */
122static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);
123
124static int via_cputemp_probe(struct platform_device *pdev)
125{
126 struct via_cputemp_data *data;
127 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
128 int err;
129 u32 eax, edx;
130
131 data = devm_kzalloc(&pdev->dev, sizeof(struct via_cputemp_data),
132 GFP_KERNEL);
133 if (!data)
134 return -ENOMEM;
135
136 data->id = pdev->id;
137 data->name = "via_cputemp";
138
139 switch (c->x86_model) {
140 case 0xA:
141 /* C7 A */
142 case 0xD:
143 /* C7 D */
144 data->msr_temp = 0x1169;
145 data->msr_vid = 0x198;
146 break;
147 case 0xF:
148 /* Nano */
149 data->msr_temp = 0x1423;
150 break;
151 default:
152 return -ENODEV;
153 }
154
155 /* test if we can access the TEMPERATURE MSR */
156 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
157 if (err) {
158 dev_err(&pdev->dev,
159 "Unable to access TEMPERATURE MSR, giving up\n");
160 return err;
161 }
162
163 platform_set_drvdata(pdev, data);
164
165 err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
166 if (err)
167 return err;
168
169 if (data->msr_vid)
170 data->vrm = vid_which_vrm();
171
172 if (data->vrm) {
173 err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
174 if (err)
175 goto exit_remove;
176 }
177
178 data->hwmon_dev = hwmon_device_register(&pdev->dev);
179 if (IS_ERR(data->hwmon_dev)) {
180 err = PTR_ERR(data->hwmon_dev);
181 dev_err(&pdev->dev, "Class registration failed (%d)\n",
182 err);
183 goto exit_remove;
184 }
185
186 return 0;
187
188exit_remove:
189 if (data->vrm)
190 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
191 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
192 return err;
193}
194
195static int via_cputemp_remove(struct platform_device *pdev)
196{
197 struct via_cputemp_data *data = platform_get_drvdata(pdev);
198
199 hwmon_device_unregister(data->hwmon_dev);
200 if (data->vrm)
201 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
202 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
203 return 0;
204}
205
206static struct platform_driver via_cputemp_driver = {
207 .driver = {
208 .owner = THIS_MODULE,
209 .name = DRVNAME,
210 },
211 .probe = via_cputemp_probe,
212 .remove = via_cputemp_remove,
213};
214
215struct pdev_entry {
216 struct list_head list;
217 struct platform_device *pdev;
218 unsigned int cpu;
219};
220
221static LIST_HEAD(pdev_list);
222static DEFINE_MUTEX(pdev_list_mutex);
223
224static int via_cputemp_device_add(unsigned int cpu)
225{
226 int err;
227 struct platform_device *pdev;
228 struct pdev_entry *pdev_entry;
229
230 pdev = platform_device_alloc(DRVNAME, cpu);
231 if (!pdev) {
232 err = -ENOMEM;
233 pr_err("Device allocation failed\n");
234 goto exit;
235 }
236
237 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
238 if (!pdev_entry) {
239 err = -ENOMEM;
240 goto exit_device_put;
241 }
242
243 err = platform_device_add(pdev);
244 if (err) {
245 pr_err("Device addition failed (%d)\n", err);
246 goto exit_device_free;
247 }
248
249 pdev_entry->pdev = pdev;
250 pdev_entry->cpu = cpu;
251 mutex_lock(&pdev_list_mutex);
252 list_add_tail(&pdev_entry->list, &pdev_list);
253 mutex_unlock(&pdev_list_mutex);
254
255 return 0;
256
257exit_device_free:
258 kfree(pdev_entry);
259exit_device_put:
260 platform_device_put(pdev);
261exit:
262 return err;
263}
264
265static void via_cputemp_device_remove(unsigned int cpu)
266{
267 struct pdev_entry *p;
268
269 mutex_lock(&pdev_list_mutex);
270 list_for_each_entry(p, &pdev_list, list) {
271 if (p->cpu == cpu) {
272 platform_device_unregister(p->pdev);
273 list_del(&p->list);
274 mutex_unlock(&pdev_list_mutex);
275 kfree(p);
276 return;
277 }
278 }
279 mutex_unlock(&pdev_list_mutex);
280}
281
282static int via_cputemp_cpu_callback(struct notifier_block *nfb,
283 unsigned long action, void *hcpu)
284{
285 unsigned int cpu = (unsigned long) hcpu;
286
287 switch (action) {
288 case CPU_ONLINE:
289 case CPU_DOWN_FAILED:
290 via_cputemp_device_add(cpu);
291 break;
292 case CPU_DOWN_PREPARE:
293 via_cputemp_device_remove(cpu);
294 break;
295 }
296 return NOTIFY_OK;
297}
298
299static struct notifier_block via_cputemp_cpu_notifier __refdata = {
300 .notifier_call = via_cputemp_cpu_callback,
301};
302
303static const struct x86_cpu_id __initconst cputemp_ids[] = {
304 { X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */
305 { X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */
306 { X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */
307 {}
308};
309MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
310
311static int __init via_cputemp_init(void)
312{
313 int i, err;
314
315 if (!x86_match_cpu(cputemp_ids))
316 return -ENODEV;
317
318 err = platform_driver_register(&via_cputemp_driver);
319 if (err)
320 goto exit;
321
322 cpu_notifier_register_begin();
323 for_each_online_cpu(i) {
324 struct cpuinfo_x86 *c = &cpu_data(i);
325
326 if (c->x86 != 6)
327 continue;
328
329 if (c->x86_model < 0x0a)
330 continue;
331
332 if (c->x86_model > 0x0f) {
333 pr_warn("Unknown CPU model 0x%x\n", c->x86_model);
334 continue;
335 }
336
337 via_cputemp_device_add(i);
338 }
339
340#ifndef CONFIG_HOTPLUG_CPU
341 if (list_empty(&pdev_list)) {
342 cpu_notifier_register_done();
343 err = -ENODEV;
344 goto exit_driver_unreg;
345 }
346#endif
347
348 __register_hotcpu_notifier(&via_cputemp_cpu_notifier);
349 cpu_notifier_register_done();
350 return 0;
351
352#ifndef CONFIG_HOTPLUG_CPU
353exit_driver_unreg:
354 platform_driver_unregister(&via_cputemp_driver);
355#endif
356exit:
357 return err;
358}
359
360static void __exit via_cputemp_exit(void)
361{
362 struct pdev_entry *p, *n;
363
364 cpu_notifier_register_begin();
365 __unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
366 mutex_lock(&pdev_list_mutex);
367 list_for_each_entry_safe(p, n, &pdev_list, list) {
368 platform_device_unregister(p->pdev);
369 list_del(&p->list);
370 kfree(p);
371 }
372 mutex_unlock(&pdev_list_mutex);
373 cpu_notifier_register_done();
374 platform_driver_unregister(&via_cputemp_driver);
375}
376
377MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
378MODULE_DESCRIPTION("VIA CPU temperature monitor");
379MODULE_LICENSE("GPL");
380
381module_init(via_cputemp_init)
382module_exit(via_cputemp_exit)