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Linux/drivers/hwmon/via-cputemp.c

  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 
 44 enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
 45 
 46 /*
 47  * Functions declaration
 48  */
 49 
 50 struct 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 
 63 static 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 
 77 static 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 
 91 static 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 
105 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
106                           SHOW_TEMP);
107 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
108 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
109 
110 static 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 
117 static const struct attribute_group via_cputemp_group = {
118         .attrs = via_cputemp_attributes,
119 };
120 
121 /* Optional attributes */
122 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);
123 
124 static 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 
188 exit_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 
195 static 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 
206 static struct platform_driver via_cputemp_driver = {
207         .driver = {
208                 .name = DRVNAME,
209         },
210         .probe = via_cputemp_probe,
211         .remove = via_cputemp_remove,
212 };
213 
214 struct pdev_entry {
215         struct list_head list;
216         struct platform_device *pdev;
217         unsigned int cpu;
218 };
219 
220 static LIST_HEAD(pdev_list);
221 static DEFINE_MUTEX(pdev_list_mutex);
222 
223 static 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 
256 exit_device_free:
257         kfree(pdev_entry);
258 exit_device_put:
259         platform_device_put(pdev);
260 exit:
261         return err;
262 }
263 
264 static 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 
282 static const struct x86_cpu_id __initconst cputemp_ids[] = {
283         { X86_VENDOR_CENTAUR, 6, 0xa, }, /* C7 A */
284         { X86_VENDOR_CENTAUR, 6, 0xd, }, /* C7 D */
285         { X86_VENDOR_CENTAUR, 6, 0xf, }, /* Nano */
286         {}
287 };
288 MODULE_DEVICE_TABLE(x86cpu, cputemp_ids);
289 
290 static enum cpuhp_state via_temp_online;
291 
292 static 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
318 exit_hp_unreg:
319         cpuhp_remove_state_nocalls(via_temp_online);
320 #endif
321 exit_driver_unreg:
322         platform_driver_unregister(&via_cputemp_driver);
323 exit:
324         return err;
325 }
326 
327 static void __exit via_cputemp_exit(void)
328 {
329         cpuhp_remove_state(via_temp_online);
330         platform_driver_unregister(&via_cputemp_driver);
331 }
332 
333 MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
334 MODULE_DESCRIPTION("VIA CPU temperature monitor");
335 MODULE_LICENSE("GPL");
336 
337 module_init(via_cputemp_init)
338 module_exit(via_cputemp_exit)
339 

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