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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 switch (c->x86_model) {
140 case 0xA:
141
142 case 0xD:
143
144 data->msr_temp = 0x1169;
145 data->msr_vid = 0x198;
146 break;
147 case 0xF:
148
149 data->msr_temp = 0x1423;
150 break;
151 default:
152 return -ENODEV;
153 }
154
155
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 .name = DRVNAME,
209 },
210 .probe = via_cputemp_probe,
211 .remove = via_cputemp_remove,
212};
213
214struct pdev_entry {
215 struct list_head list;
216 struct platform_device *pdev;
217 unsigned int cpu;
218};
219
220static LIST_HEAD(pdev_list);
221static DEFINE_MUTEX(pdev_list_mutex);
222
223static int via_cputemp_online(unsigned int cpu)
224{
225 int err;
226 struct platform_device *pdev;
227 struct pdev_entry *pdev_entry;
228
229 pdev = platform_device_alloc(DRVNAME, cpu);
230 if (!pdev) {
231 err = -ENOMEM;
232 pr_err("Device allocation failed\n");
233 goto exit;
234 }
235
236 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
237 if (!pdev_entry) {
238 err = -ENOMEM;
239 goto exit_device_put;
240 }
241
242 err = platform_device_add(pdev);
243 if (err) {
244 pr_err("Device addition failed (%d)\n", err);
245 goto exit_device_free;
246 }
247
248 pdev_entry->pdev = pdev;
249 pdev_entry->cpu = cpu;
250 mutex_lock(&pdev_list_mutex);
251 list_add_tail(&pdev_entry->list, &pdev_list);
252 mutex_unlock(&pdev_list_mutex);
253
254 return 0;
255
256exit_device_free:
257 kfree(pdev_entry);
258exit_device_put:
259 platform_device_put(pdev);
260exit:
261 return err;
262}
263
264static int via_cputemp_down_prep(unsigned int cpu)
265{
266 struct pdev_entry *p;
267
268 mutex_lock(&pdev_list_mutex);
269 list_for_each_entry(p, &pdev_list, list) {
270 if (p->cpu == cpu) {
271 platform_device_unregister(p->pdev);
272 list_del(&p->list);
273 mutex_unlock(&pdev_list_mutex);
274 kfree(p);
275 return 0;
276 }
277 }
278 mutex_unlock(&pdev_list_mutex);
279 return 0;
280}
281
282static const struct x86_cpu_id __initconst cputemp_ids[] = {
283 { X86_VENDOR_CENTAUR, 6, 0xa, },
284 { X86_VENDOR_CENTAUR, 6, 0xd, },
285 { X86_VENDOR_CENTAUR, 6, 0xf, },
286 {}
287};
288MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
289
290static enum cpuhp_state via_temp_online;
291
292static int __init via_cputemp_init(void)
293{
294 int err;
295
296 if (!x86_match_cpu(cputemp_ids))
297 return -ENODEV;
298
299 err = platform_driver_register(&via_cputemp_driver);
300 if (err)
301 goto exit;
302
303 err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/via:online",
304 via_cputemp_online, via_cputemp_down_prep);
305 if (err < 0)
306 goto exit_driver_unreg;
307 via_temp_online = err;
308
309#ifndef CONFIG_HOTPLUG_CPU
310 if (list_empty(&pdev_list)) {
311 err = -ENODEV;
312 goto exit_hp_unreg;
313 }
314#endif
315 return 0;
316
317#ifndef CONFIG_HOTPLUG_CPU
318exit_hp_unreg:
319 cpuhp_remove_state_nocalls(via_temp_online);
320#endif
321exit_driver_unreg:
322 platform_driver_unregister(&via_cputemp_driver);
323exit:
324 return err;
325}
326
327static void __exit via_cputemp_exit(void)
328{
329 cpuhp_remove_state(via_temp_online);
330 platform_driver_unregister(&via_cputemp_driver);
331}
332
333MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
334MODULE_DESCRIPTION("VIA CPU temperature monitor");
335MODULE_LICENSE("GPL");
336
337module_init(via_cputemp_init)
338module_exit(via_cputemp_exit)
339
