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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
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
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
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 cpu0_vid_show(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
122static DEVICE_ATTR_RO(cpu0_vid);
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 if (c->x86 == 7) {
140 data->msr_temp = 0x1423;
141 } else {
142 switch (c->x86_model) {
143 case 0xA:
144
145 case 0xD:
146
147 data->msr_temp = 0x1169;
148 data->msr_vid = 0x198;
149 break;
150 case 0xF:
151
152 data->msr_temp = 0x1423;
153 break;
154 default:
155 return -ENODEV;
156 }
157 }
158
159
160 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
161 if (err) {
162 dev_err(&pdev->dev,
163 "Unable to access TEMPERATURE MSR, giving up\n");
164 return err;
165 }
166
167 platform_set_drvdata(pdev, data);
168
169 err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
170 if (err)
171 return err;
172
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
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
192exit_remove:
193 if (data->vrm)
194 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
195 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
196 return err;
197}
198
199static int via_cputemp_remove(struct platform_device *pdev)
200{
201 struct via_cputemp_data *data = platform_get_drvdata(pdev);
202
203 hwmon_device_unregister(data->hwmon_dev);
204 if (data->vrm)
205 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
206 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
207 return 0;
208}
209
210static struct platform_driver via_cputemp_driver = {
211 .driver = {
212 .name = DRVNAME,
213 },
214 .probe = via_cputemp_probe,
215 .remove = via_cputemp_remove,
216};
217
218struct pdev_entry {
219 struct list_head list;
220 struct platform_device *pdev;
221 unsigned int cpu;
222};
223
224static LIST_HEAD(pdev_list);
225static DEFINE_MUTEX(pdev_list_mutex);
226
227static int via_cputemp_online(unsigned int cpu)
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;
236 pr_err("Device allocation failed\n");
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) {
248 pr_err("Device addition failed (%d)\n", err);
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
260exit_device_free:
261 kfree(pdev_entry);
262exit_device_put:
263 platform_device_put(pdev);
264exit:
265 return err;
266}
267
268static int via_cputemp_down_prep(unsigned int cpu)
269{
270 struct pdev_entry *p;
271
272 mutex_lock(&pdev_list_mutex);
273 list_for_each_entry(p, &pdev_list, list) {
274 if (p->cpu == cpu) {
275 platform_device_unregister(p->pdev);
276 list_del(&p->list);
277 mutex_unlock(&pdev_list_mutex);
278 kfree(p);
279 return 0;
280 }
281 }
282 mutex_unlock(&pdev_list_mutex);
283 return 0;
284}
285
286static const struct x86_cpu_id __initconst cputemp_ids[] = {
287 { X86_VENDOR_CENTAUR, 6, 0xa, },
288 { X86_VENDOR_CENTAUR, 6, 0xd, },
289 { X86_VENDOR_CENTAUR, 6, 0xf, },
290 { X86_VENDOR_CENTAUR, 7, X86_MODEL_ANY, },
291 {}
292};
293MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
294
295static enum cpuhp_state via_temp_online;
296
297static int __init via_cputemp_init(void)
298{
299 int err;
300
301 if (!x86_match_cpu(cputemp_ids))
302 return -ENODEV;
303
304 err = platform_driver_register(&via_cputemp_driver);
305 if (err)
306 goto exit;
307
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;
313
314#ifndef CONFIG_HOTPLUG_CPU
315 if (list_empty(&pdev_list)) {
316 err = -ENODEV;
317 goto exit_hp_unreg;
318 }
319#endif
320 return 0;
321
322#ifndef CONFIG_HOTPLUG_CPU
323exit_hp_unreg:
324 cpuhp_remove_state_nocalls(via_temp_online);
325#endif
326exit_driver_unreg:
327 platform_driver_unregister(&via_cputemp_driver);
328exit:
329 return err;
330}
331
332static void __exit via_cputemp_exit(void)
333{
334 cpuhp_remove_state(via_temp_online);
335 platform_driver_unregister(&via_cputemp_driver);
336}
337
338MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
339MODULE_DESCRIPTION("VIA CPU temperature monitor");
340MODULE_LICENSE("GPL");
341
342module_init(via_cputemp_init)
343module_exit(via_cputemp_exit)
344
