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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
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
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
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
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
131 case 0xD:
132
133 data->msr_temp = 0x1169;
134 data->msr_vid = 0x198;
135 break;
136 case 0xF:
137
138 data->msr_temp = 0x1423;
139 break;
140 default:
141 return -ENODEV;
142 }
143 }
144
145
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 int 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 return 0;
194}
195
196static struct platform_driver via_cputemp_driver = {
197 .driver = {
198 .name = DRVNAME,
199 },
200 .probe = via_cputemp_probe,
201 .remove = via_cputemp_remove,
202};
203
204struct pdev_entry {
205 struct list_head list;
206 struct platform_device *pdev;
207 unsigned int cpu;
208};
209
210static LIST_HEAD(pdev_list);
211static DEFINE_MUTEX(pdev_list_mutex);
212
213static int via_cputemp_online(unsigned int cpu)
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;
222 pr_err("Device allocation failed\n");
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) {
234 pr_err("Device addition failed (%d)\n", err);
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
246exit_device_free:
247 kfree(pdev_entry);
248exit_device_put:
249 platform_device_put(pdev);
250exit:
251 return err;
252}
253
254static int via_cputemp_down_prep(unsigned int cpu)
255{
256 struct pdev_entry *p;
257
258 mutex_lock(&pdev_list_mutex);
259 list_for_each_entry(p, &pdev_list, list) {
260 if (p->cpu == cpu) {
261 platform_device_unregister(p->pdev);
262 list_del(&p->list);
263 mutex_unlock(&pdev_list_mutex);
264 kfree(p);
265 return 0;
266 }
267 }
268 mutex_unlock(&pdev_list_mutex);
269 return 0;
270}
271
272static const struct x86_cpu_id __initconst cputemp_ids[] = {
273 { X86_VENDOR_CENTAUR, 6, 0xa, },
274 { X86_VENDOR_CENTAUR, 6, 0xd, },
275 { X86_VENDOR_CENTAUR, 6, 0xf, },
276 { X86_VENDOR_CENTAUR, 7, X86_MODEL_ANY, },
277 {}
278};
279MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
280
281static enum cpuhp_state via_temp_online;
282
283static int __init via_cputemp_init(void)
284{
285 int err;
286
287 if (!x86_match_cpu(cputemp_ids))
288 return -ENODEV;
289
290 err = platform_driver_register(&via_cputemp_driver);
291 if (err)
292 goto exit;
293
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;
299
300#ifndef CONFIG_HOTPLUG_CPU
301 if (list_empty(&pdev_list)) {
302 err = -ENODEV;
303 goto exit_hp_unreg;
304 }
305#endif
306 return 0;
307
308#ifndef CONFIG_HOTPLUG_CPU
309exit_hp_unreg:
310 cpuhp_remove_state_nocalls(via_temp_online);
311#endif
312exit_driver_unreg:
313 platform_driver_unregister(&via_cputemp_driver);
314exit:
315 return err;
316}
317
318static void __exit via_cputemp_exit(void)
319{
320 cpuhp_remove_state(via_temp_online);
321 platform_driver_unregister(&via_cputemp_driver);
322}
323
324MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
325MODULE_DESCRIPTION("VIA CPU temperature monitor");
326MODULE_LICENSE("GPL");
327
328module_init(via_cputemp_init)
329module_exit(via_cputemp_exit)
330
