2 * k8temp.c - Linux kernel module for hardware monitoring
4 * Copyright (C) 2006 Rudolf Marek <r.marek@assembler.cz>
6 * Inspired from the w83785 and amd756 drivers.
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.
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
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>
36 #define TEMP_FROM_REG(val) (((((val) >> 16) & 0xff) - 49) * 1000)
38 #define SEL_PLACE 0x40
42 struct device *hwmon_dev;
43 struct mutex update_lock;
45 char valid; /* zero until following fields are valid */
46 unsigned long last_updated; /* in jiffies */
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 */
55 static struct k8temp_data *k8temp_update_device(struct device *dev)
57 struct k8temp_data *data = dev_get_drvdata(dev);
58 struct pci_dev *pdev = to_pci_dev(dev);
61 mutex_lock(&data->update_lock);
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]);
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,
77 if (data->sensorsp & SEL_CORE) {
78 tmp &= ~SEL_PLACE; /* Select sensor 0, core1 */
80 pci_write_config_byte(pdev, REG_TEMP, tmp);
81 pci_read_config_dword(pdev, REG_TEMP,
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,
92 data->last_updated = jiffies;
96 mutex_unlock(&data->update_lock);
104 static ssize_t show_name(struct device *dev, struct device_attribute
107 struct k8temp_data *data = dev_get_drvdata(dev);
109 return sprintf(buf, "%s\n", data->name);
113 static ssize_t show_temp(struct device *dev,
114 struct device_attribute *devattr, char *buf)
116 struct sensor_device_attribute_2 *attr =
117 to_sensor_dev_attr_2(devattr);
119 int place = attr->index;
121 struct k8temp_data *data = k8temp_update_device(dev);
123 if (data->swap_core_select)
126 temp = TEMP_FROM_REG(data->temp[core][place]) + data->temp_offset;
128 return sprintf(buf, "%d\n", temp);
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);
139 static struct pci_device_id k8temp_ids[] = {
140 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
144 MODULE_DEVICE_TABLE(pci, k8temp_ids);
146 static int __devinit k8temp_probe(struct pci_dev *pdev,
147 const struct pci_device_id *id)
153 struct k8temp_data *data;
155 if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
160 model = boot_cpu_data.x86_model;
161 stepping = boot_cpu_data.x86_mask;
163 switch (boot_cpu_data.x86) {
165 /* feature available since SH-C0, exclude older revisions */
166 if (((model == 4) && (stepping == 0)) ||
167 ((model == 5) && (stepping <= 1))) {
173 * AMD NPT family 0fh, i.e. RevF and RevG:
174 * meaning of SEL_CORE bit is inverted
177 data->swap_core_select = 1;
178 dev_warn(&pdev->dev, "Temperature readouts might be "
179 "wrong - check erratum #141\n");
182 if ((model >= 0x69) &&
183 !(model == 0xc1 || model == 0x6c || model == 0x7c)) {
185 * RevG desktop CPUs (i.e. no socket S1G1 parts)
186 * need additional offset, otherwise reported
187 * temperature is below ambient temperature
189 data->temp_offset = 21000;
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);
200 if (scfg & (SEL_PLACE | SEL_CORE)) {
201 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
206 scfg |= (SEL_PLACE | SEL_CORE);
207 pci_write_config_byte(pdev, REG_TEMP, scfg);
209 /* now we know if we can change core and/or sensor */
210 pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
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;
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;
229 data->name = "k8temp";
230 mutex_init(&data->update_lock);
231 dev_set_drvdata(&pdev->dev, data);
233 /* Register sysfs hooks */
234 err = device_create_file(&pdev->dev,
235 &sensor_dev_attr_temp1_input.dev_attr);
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);
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);
253 if (data->sensorsp & SEL_PLACE)
254 err = device_create_file(&pdev->dev,
255 &sensor_dev_attr_temp4_input.
261 err = device_create_file(&pdev->dev, &dev_attr_name);
265 data->hwmon_dev = hwmon_device_register(&pdev->dev);
267 if (IS_ERR(data->hwmon_dev)) {
268 err = PTR_ERR(data->hwmon_dev);
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);
285 dev_set_drvdata(&pdev->dev, NULL);
291 static void __devexit k8temp_remove(struct pci_dev *pdev)
293 struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
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);
309 static struct pci_driver k8temp_driver = {
311 .id_table = k8temp_ids,
312 .probe = k8temp_probe,
313 .remove = __devexit_p(k8temp_remove),
316 static int __init k8temp_init(void)
318 return pci_register_driver(&k8temp_driver);
321 static void __exit k8temp_exit(void)
323 pci_unregister_driver(&k8temp_driver);
326 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
327 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
328 MODULE_LICENSE("GPL");
330 module_init(k8temp_init)
331 module_exit(k8temp_exit)