Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / via-cputemp.c
blob8eac67d769fa8a18788b15da2debe6a5256ed47a
1 /*
2 * via-cputemp.c - Driver for VIA CPU core temperature monitoring
3 * Copyright (C) 2009 VIA Technologies, Inc.
5 * based on existing coretemp.c, which is
7 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
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.
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.
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.
24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
41 #define DRVNAME "via_cputemp"
43 enum { SHOW_TEMP, SHOW_LABEL, SHOW_NAME };
46 * Functions declaration
49 struct via_cputemp_data {
50 struct device *hwmon_dev;
51 const char *name;
52 u8 vrm;
53 u32 id;
54 u32 msr_temp;
55 u32 msr_vid;
59 * Sysfs stuff
62 static ssize_t show_name(struct device *dev, struct device_attribute
63 *devattr, char *buf)
65 int ret;
66 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
67 struct via_cputemp_data *data = dev_get_drvdata(dev);
69 if (attr->index == SHOW_NAME)
70 ret = sprintf(buf, "%s\n", data->name);
71 else /* show label */
72 ret = sprintf(buf, "Core %d\n", data->id);
73 return ret;
76 static ssize_t show_temp(struct device *dev,
77 struct device_attribute *devattr, char *buf)
79 struct via_cputemp_data *data = dev_get_drvdata(dev);
80 u32 eax, edx;
81 int err;
83 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
84 if (err)
85 return -EAGAIN;
87 return sprintf(buf, "%lu\n", ((unsigned long)eax & 0xffffff) * 1000);
90 static ssize_t show_cpu_vid(struct device *dev,
91 struct device_attribute *devattr, char *buf)
93 struct via_cputemp_data *data = dev_get_drvdata(dev);
94 u32 eax, edx;
95 int err;
97 err = rdmsr_safe_on_cpu(data->id, data->msr_vid, &eax, &edx);
98 if (err)
99 return -EAGAIN;
101 return sprintf(buf, "%d\n", vid_from_reg(~edx & 0x7f, data->vrm));
104 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
105 SHOW_TEMP);
106 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
107 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
109 static struct attribute *via_cputemp_attributes[] = {
110 &sensor_dev_attr_name.dev_attr.attr,
111 &sensor_dev_attr_temp1_label.dev_attr.attr,
112 &sensor_dev_attr_temp1_input.dev_attr.attr,
113 NULL
116 static const struct attribute_group via_cputemp_group = {
117 .attrs = via_cputemp_attributes,
120 /* Optional attributes */
121 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_cpu_vid, NULL);
123 static int __devinit via_cputemp_probe(struct platform_device *pdev)
125 struct via_cputemp_data *data;
126 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
127 int err;
128 u32 eax, edx;
130 data = kzalloc(sizeof(struct via_cputemp_data), GFP_KERNEL);
131 if (!data) {
132 err = -ENOMEM;
133 dev_err(&pdev->dev, "Out of memory\n");
134 goto exit;
137 data->id = pdev->id;
138 data->name = "via_cputemp";
140 switch (c->x86_model) {
141 case 0xA:
142 /* C7 A */
143 case 0xD:
144 /* C7 D */
145 data->msr_temp = 0x1169;
146 data->msr_vid = 0x198;
147 break;
148 case 0xF:
149 /* Nano */
150 data->msr_temp = 0x1423;
151 break;
152 default:
153 err = -ENODEV;
154 goto exit_free;
157 /* test if we can access the TEMPERATURE MSR */
158 err = rdmsr_safe_on_cpu(data->id, data->msr_temp, &eax, &edx);
159 if (err) {
160 dev_err(&pdev->dev,
161 "Unable to access TEMPERATURE MSR, giving up\n");
162 goto exit_free;
165 platform_set_drvdata(pdev, data);
167 err = sysfs_create_group(&pdev->dev.kobj, &via_cputemp_group);
168 if (err)
169 goto exit_free;
171 if (data->msr_vid)
172 data->vrm = vid_which_vrm();
174 if (data->vrm) {
175 err = device_create_file(&pdev->dev, &dev_attr_cpu0_vid);
176 if (err)
177 goto exit_remove;
180 data->hwmon_dev = hwmon_device_register(&pdev->dev);
181 if (IS_ERR(data->hwmon_dev)) {
182 err = PTR_ERR(data->hwmon_dev);
183 dev_err(&pdev->dev, "Class registration failed (%d)\n",
184 err);
185 goto exit_remove;
188 return 0;
190 exit_remove:
191 if (data->vrm)
192 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
193 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
194 exit_free:
195 platform_set_drvdata(pdev, NULL);
196 kfree(data);
197 exit:
198 return err;
201 static int __devexit via_cputemp_remove(struct platform_device *pdev)
203 struct via_cputemp_data *data = platform_get_drvdata(pdev);
205 hwmon_device_unregister(data->hwmon_dev);
206 if (data->vrm)
207 device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
208 sysfs_remove_group(&pdev->dev.kobj, &via_cputemp_group);
209 platform_set_drvdata(pdev, NULL);
210 kfree(data);
211 return 0;
214 static struct platform_driver via_cputemp_driver = {
215 .driver = {
216 .owner = THIS_MODULE,
217 .name = DRVNAME,
219 .probe = via_cputemp_probe,
220 .remove = __devexit_p(via_cputemp_remove),
223 struct pdev_entry {
224 struct list_head list;
225 struct platform_device *pdev;
226 unsigned int cpu;
229 static LIST_HEAD(pdev_list);
230 static DEFINE_MUTEX(pdev_list_mutex);
232 static int __cpuinit via_cputemp_device_add(unsigned int cpu)
234 int err;
235 struct platform_device *pdev;
236 struct pdev_entry *pdev_entry;
238 pdev = platform_device_alloc(DRVNAME, cpu);
239 if (!pdev) {
240 err = -ENOMEM;
241 pr_err("Device allocation failed\n");
242 goto exit;
245 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
246 if (!pdev_entry) {
247 err = -ENOMEM;
248 goto exit_device_put;
251 err = platform_device_add(pdev);
252 if (err) {
253 pr_err("Device addition failed (%d)\n", err);
254 goto exit_device_free;
257 pdev_entry->pdev = pdev;
258 pdev_entry->cpu = cpu;
259 mutex_lock(&pdev_list_mutex);
260 list_add_tail(&pdev_entry->list, &pdev_list);
261 mutex_unlock(&pdev_list_mutex);
263 return 0;
265 exit_device_free:
266 kfree(pdev_entry);
267 exit_device_put:
268 platform_device_put(pdev);
269 exit:
270 return err;
273 static void __cpuinit via_cputemp_device_remove(unsigned int cpu)
275 struct pdev_entry *p;
277 mutex_lock(&pdev_list_mutex);
278 list_for_each_entry(p, &pdev_list, list) {
279 if (p->cpu == cpu) {
280 platform_device_unregister(p->pdev);
281 list_del(&p->list);
282 mutex_unlock(&pdev_list_mutex);
283 kfree(p);
284 return;
287 mutex_unlock(&pdev_list_mutex);
290 static int __cpuinit via_cputemp_cpu_callback(struct notifier_block *nfb,
291 unsigned long action, void *hcpu)
293 unsigned int cpu = (unsigned long) hcpu;
295 switch (action) {
296 case CPU_ONLINE:
297 case CPU_DOWN_FAILED:
298 via_cputemp_device_add(cpu);
299 break;
300 case CPU_DOWN_PREPARE:
301 via_cputemp_device_remove(cpu);
302 break;
304 return NOTIFY_OK;
307 static struct notifier_block via_cputemp_cpu_notifier __refdata = {
308 .notifier_call = via_cputemp_cpu_callback,
311 static int __init via_cputemp_init(void)
313 int i, err;
315 if (cpu_data(0).x86_vendor != X86_VENDOR_CENTAUR) {
316 printk(KERN_DEBUG DRVNAME ": Not a VIA CPU\n");
317 err = -ENODEV;
318 goto exit;
321 err = platform_driver_register(&via_cputemp_driver);
322 if (err)
323 goto exit;
325 for_each_online_cpu(i) {
326 struct cpuinfo_x86 *c = &cpu_data(i);
328 if (c->x86 != 6)
329 continue;
331 if (c->x86_model < 0x0a)
332 continue;
334 if (c->x86_model > 0x0f) {
335 pr_warn("Unknown CPU model 0x%x\n", c->x86_model);
336 continue;
339 via_cputemp_device_add(i);
342 #ifndef CONFIG_HOTPLUG_CPU
343 if (list_empty(&pdev_list)) {
344 err = -ENODEV;
345 goto exit_driver_unreg;
347 #endif
349 register_hotcpu_notifier(&via_cputemp_cpu_notifier);
350 return 0;
352 #ifndef CONFIG_HOTPLUG_CPU
353 exit_driver_unreg:
354 platform_driver_unregister(&via_cputemp_driver);
355 #endif
356 exit:
357 return err;
360 static void __exit via_cputemp_exit(void)
362 struct pdev_entry *p, *n;
364 unregister_hotcpu_notifier(&via_cputemp_cpu_notifier);
365 mutex_lock(&pdev_list_mutex);
366 list_for_each_entry_safe(p, n, &pdev_list, list) {
367 platform_device_unregister(p->pdev);
368 list_del(&p->list);
369 kfree(p);
371 mutex_unlock(&pdev_list_mutex);
372 platform_driver_unregister(&via_cputemp_driver);
375 MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>");
376 MODULE_DESCRIPTION("VIA CPU temperature monitor");
377 MODULE_LICENSE("GPL");
379 module_init(via_cputemp_init)
380 module_exit(via_cputemp_exit)