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[linux-2.6.git] / drivers / hwmon / k8temp.c
1 /*
2  * k8temp.c - Linux kernel module for hardware monitoring
3  *
4  * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
5  *
6  * Inspired from the w83785 and amd756 drivers.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
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 #include <linux/module.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/jiffies.h>
29 #include <linux/pci.h>
30 #include <linux/hwmon.h>
31 #include <linux/hwmon-sysfs.h>
32 #include <linux/err.h>
33 #include <linux/mutex.h>
34 #include <asm/processor.h>
35
36 #define TEMP_FROM_REG(val)      (((((val) >> 16) & 0xff) - 49) * 1000)
37 #define REG_TEMP        0xe4
38 #define SEL_PLACE       0x40
39 #define SEL_CORE        0x04
40
41 struct k8temp_data {
42         struct device *hwmon_dev;
43         struct mutex update_lock;
44         const char *name;
45         char valid;             /* zero until following fields are valid */
46         unsigned long last_updated;     /* in jiffies */
47
48         /* registers values */
49         u8 sensorsp;            /* sensor presence bits - SEL_CORE & SEL_PLACE */
50         u32 temp[2][2];         /* core, place */
51         u8 swap_core_select;    /* meaning of SEL_CORE is inverted */
52         u32 temp_offset;
53 };
54
55 static struct k8temp_data *k8temp_update_device(struct device *dev)
56 {
57         struct k8temp_data *data = dev_get_drvdata(dev);
58         struct pci_dev *pdev = to_pci_dev(dev);
59         u8 tmp;
60
61         mutex_lock(&data->update_lock);
62
63         if (!data->valid
64             || time_after(jiffies, data->last_updated + HZ)) {
65                 pci_read_config_byte(pdev, REG_TEMP, &tmp);
66                 tmp &= ~(SEL_PLACE | SEL_CORE);         /* Select sensor 0, core0 */
67                 pci_write_config_byte(pdev, REG_TEMP, tmp);
68                 pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
69
70                 if (data->sensorsp & SEL_PLACE) {
71                         tmp |= SEL_PLACE;       /* Select sensor 1, core0 */
72                         pci_write_config_byte(pdev, REG_TEMP, tmp);
73                         pci_read_config_dword(pdev, REG_TEMP,
74                                               &data->temp[0][1]);
75                 }
76
77                 if (data->sensorsp & SEL_CORE) {
78                         tmp &= ~SEL_PLACE;      /* Select sensor 0, core1 */
79                         tmp |= SEL_CORE;
80                         pci_write_config_byte(pdev, REG_TEMP, tmp);
81                         pci_read_config_dword(pdev, REG_TEMP,
82                                               &data->temp[1][0]);
83
84                         if (data->sensorsp & SEL_PLACE) {
85                                 tmp |= SEL_PLACE;       /* Select sensor 1, core1 */
86                                 pci_write_config_byte(pdev, REG_TEMP, tmp);
87                                 pci_read_config_dword(pdev, REG_TEMP,
88                                                       &data->temp[1][1]);
89                         }
90                 }
91
92                 data->last_updated = jiffies;
93                 data->valid = 1;
94         }
95
96         mutex_unlock(&data->update_lock);
97         return data;
98 }
99
100 /*
101  * Sysfs stuff
102  */
103
104 static ssize_t show_name(struct device *dev, struct device_attribute
105                          *devattr, char *buf)
106 {
107         struct k8temp_data *data = dev_get_drvdata(dev);
108
109         return sprintf(buf, "%s\n", data->name);
110 }
111
112
113 static ssize_t show_temp(struct device *dev,
114                          struct device_attribute *devattr, char *buf)
115 {
116         struct sensor_device_attribute_2 *attr =
117             to_sensor_dev_attr_2(devattr);
118         int core = attr->nr;
119         int place = attr->index;
120         int temp;
121         struct k8temp_data *data = k8temp_update_device(dev);
122
123         if (data->swap_core_select)
124                 core = core ? 0 : 1;
125
126         temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
127
128         return sprintf(buf, "%d\n", temp);
129 }
130
131 /* core, place */
132
133 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
134 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
135 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
136 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
137 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
138
139 static struct pci_device_id k8temp_ids[] = {
140         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
141         { 0 },
142 };
143
144 MODULE_DEVICE_TABLE(pci, k8temp_ids);
145
146 static int __devinit k8temp_probe(struct pci_dev *pdev,
147                                   const struct pci_device_id *id)
148 {
149         int err;
150         u8 scfg;
151         u32 temp;
152         u8 model, stepping;
153         struct k8temp_data *data;
154
155         if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
156                 err = -ENOMEM;
157                 goto exit;
158         }
159
160         model = boot_cpu_data.x86_model;
161         stepping = boot_cpu_data.x86_mask;
162
163         switch (boot_cpu_data.x86) {
164         case 0xf:
165                 /* feature available since SH-C0, exclude older revisions */
166                 if (((model == 4) && (stepping == 0)) ||
167                     ((model == 5) && (stepping <= 1))) {
168                         err = -ENODEV;
169                         goto exit_free;
170                 }
171
172                 /*
173                  * AMD NPT family 0fh, i.e. RevF and RevG:
174                  * meaning of SEL_CORE bit is inverted
175                  */
176                 if (model >= 0x40) {
177                         data->swap_core_select = 1;
178                         dev_warn(&pdev->dev, "Temperature readouts might be "
179                                  "wrong - check erratum #141\n");
180                 }
181
182                 if ((model >= 0x69) &&
183                     !(model == 0xc1 || model == 0x6c || model == 0x7c)) {
184                         /*
185                          * RevG desktop CPUs (i.e. no socket S1G1 parts)
186                          * need additional offset, otherwise reported
187                          * temperature is below ambient temperature
188                          */
189                         data->temp_offset = 21000;
190                 }
191
192                 break;
193         }
194
195         pci_read_config_byte(pdev, REG_TEMP, &scfg);
196         scfg &= ~(SEL_PLACE | SEL_CORE);                /* Select sensor 0, core0 */
197         pci_write_config_byte(pdev, REG_TEMP, scfg);
198         pci_read_config_byte(pdev, REG_TEMP, &scfg);
199
200         if (scfg & (SEL_PLACE | SEL_CORE)) {
201                 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
202                 err = -ENODEV;
203                 goto exit_free;
204         }
205
206         scfg |= (SEL_PLACE | SEL_CORE);
207         pci_write_config_byte(pdev, REG_TEMP, scfg);
208
209         /* now we know if we can change core and/or sensor */
210         pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
211
212         if (data->sensorsp & SEL_PLACE) {
213                 scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
214                 pci_write_config_byte(pdev, REG_TEMP, scfg);
215                 pci_read_config_dword(pdev, REG_TEMP, &temp);
216                 scfg |= SEL_CORE;       /* prepare for next selection */
217                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
218                         data->sensorsp &= ~SEL_PLACE;
219         }
220
221         if (data->sensorsp & SEL_CORE) {
222                 scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
223                 pci_write_config_byte(pdev, REG_TEMP, scfg);
224                 pci_read_config_dword(pdev, REG_TEMP, &temp);
225                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
226                         data->sensorsp &= ~SEL_CORE;
227         }
228
229         data->name = "k8temp";
230         mutex_init(&data->update_lock);
231         dev_set_drvdata(&pdev->dev, data);
232
233         /* Register sysfs hooks */
234         err = device_create_file(&pdev->dev,
235                            &sensor_dev_attr_temp1_input.dev_attr);
236         if (err)
237                 goto exit_remove;
238
239         /* sensor can be changed and reports something */
240         if (data->sensorsp & SEL_PLACE) {
241                 err = device_create_file(&pdev->dev,
242                                    &sensor_dev_attr_temp2_input.dev_attr);
243                 if (err)
244                         goto exit_remove;
245         }
246
247         /* core can be changed and reports something */
248         if (data->sensorsp & SEL_CORE) {
249                 err = device_create_file(&pdev->dev,
250                                    &sensor_dev_attr_temp3_input.dev_attr);
251                 if (err)
252                         goto exit_remove;
253                 if (data->sensorsp & SEL_PLACE)
254                         err = device_create_file(&pdev->dev,
255                                            &sensor_dev_attr_temp4_input.
256                                            dev_attr);
257                         if (err)
258                                 goto exit_remove;
259         }
260
261         err = device_create_file(&pdev->dev, &dev_attr_name);
262         if (err)
263                 goto exit_remove;
264
265         data->hwmon_dev = hwmon_device_register(&pdev->dev);
266
267         if (IS_ERR(data->hwmon_dev)) {
268                 err = PTR_ERR(data->hwmon_dev);
269                 goto exit_remove;
270         }
271
272         return 0;
273
274 exit_remove:
275         device_remove_file(&pdev->dev,
276                            &sensor_dev_attr_temp1_input.dev_attr);
277         device_remove_file(&pdev->dev,
278                            &sensor_dev_attr_temp2_input.dev_attr);
279         device_remove_file(&pdev->dev,
280                            &sensor_dev_attr_temp3_input.dev_attr);
281         device_remove_file(&pdev->dev,
282                            &sensor_dev_attr_temp4_input.dev_attr);
283         device_remove_file(&pdev->dev, &dev_attr_name);
284 exit_free:
285         dev_set_drvdata(&pdev->dev, NULL);
286         kfree(data);
287 exit:
288         return err;
289 }
290
291 static void __devexit k8temp_remove(struct pci_dev *pdev)
292 {
293         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
294
295         hwmon_device_unregister(data->hwmon_dev);
296         device_remove_file(&pdev->dev,
297                            &sensor_dev_attr_temp1_input.dev_attr);
298         device_remove_file(&pdev->dev,
299                            &sensor_dev_attr_temp2_input.dev_attr);
300         device_remove_file(&pdev->dev,
301                            &sensor_dev_attr_temp3_input.dev_attr);
302         device_remove_file(&pdev->dev,
303                            &sensor_dev_attr_temp4_input.dev_attr);
304         device_remove_file(&pdev->dev, &dev_attr_name);
305         dev_set_drvdata(&pdev->dev, NULL);
306         kfree(data);
307 }
308
309 static struct pci_driver k8temp_driver = {
310         .name = "k8temp",
311         .id_table = k8temp_ids,
312         .probe = k8temp_probe,
313         .remove = __devexit_p(k8temp_remove),
314 };
315
316 static int __init k8temp_init(void)
317 {
318         return pci_register_driver(&k8temp_driver);
319 }
320
321 static void __exit k8temp_exit(void)
322 {
323         pci_unregister_driver(&k8temp_driver);
324 }
325
326 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
327 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
328 MODULE_LICENSE("GPL");
329
330 module_init(k8temp_init)
331 module_exit(k8temp_exit)