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 };
  52
  53 static struct k8temp_data *k8temp_update_device(struct device *dev)
  54 {
  55         struct k8temp_data *data = dev_get_drvdata(dev);
  56         struct pci_dev *pdev = to_pci_dev(dev);
  57         u8 tmp;
  58
  59         mutex_lock(&data->update_lock);
  60
  61         if (!data->valid
  62             || time_after(jiffies, data->last_updated + HZ)) {
  63                 pci_read_config_byte(pdev, REG_TEMP, &tmp);
  64                 tmp &= ~(SEL_PLACE | SEL_CORE);         /* Select sensor 0, core0 */
  65                 pci_write_config_byte(pdev, REG_TEMP, tmp);
  66                 pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
  67
  68                 if (data->sensorsp & SEL_PLACE) {
  69                         tmp |= SEL_PLACE;       /* Select sensor 1, core0 */
  70                         pci_write_config_byte(pdev, REG_TEMP, tmp);
  71                         pci_read_config_dword(pdev, REG_TEMP,
  72                                               &data->temp[0][1]);
  73                 }
  74
  75                 if (data->sensorsp & SEL_CORE) {
  76                         tmp &= ~SEL_PLACE;      /* Select sensor 0, core1 */
  77                         tmp |= SEL_CORE;
  78                         pci_write_config_byte(pdev, REG_TEMP, tmp);
  79                         pci_read_config_dword(pdev, REG_TEMP,
  80                                               &data->temp[1][0]);
  81
  82                         if (data->sensorsp & SEL_PLACE) {
  83                                 tmp |= SEL_PLACE;       /* Select sensor 1, core1 */
  84                                 pci_write_config_byte(pdev, REG_TEMP, tmp);
  85                                 pci_read_config_dword(pdev, REG_TEMP,
  86                                                       &data->temp[1][1]);
  87                         }
  88                 }
  89
  90                 data->last_updated = jiffies;
  91                 data->valid = 1;
  92         }
  93
  94         mutex_unlock(&data->update_lock);
  95         return data;
  96 }
  97
  98 /*
  99  * Sysfs stuff
 100  */
 101
 102 static ssize_t show_name(struct device *dev, struct device_attribute
 103                          *devattr, char *buf)
 104 {
 105         struct k8temp_data *data = dev_get_drvdata(dev);
 106
 107         return sprintf(buf, "%s\n", data->name);
 108 }
 109
 110
 111 static ssize_t show_temp(struct device *dev,
 112                          struct device_attribute *devattr, char *buf)
 113 {
 114         struct sensor_device_attribute_2 *attr =
 115             to_sensor_dev_attr_2(devattr);
 116         int core = attr->nr;
 117         int place = attr->index;
 118         struct k8temp_data *data = k8temp_update_device(dev);
 119
 120         return sprintf(buf, "%d\n",
 121                        TEMP_FROM_REG(data->temp[core][place]));
 122 }
 123
 124 /* core, place */
 125
 126 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 127 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 128 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
 129 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
 130 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 131
 132 static struct pci_device_id k8temp_ids[] = {
 133         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
 134         { 0 },
 135 };
 136
 137 MODULE_DEVICE_TABLE(pci, k8temp_ids);
 138
 139 static int __devinit k8temp_probe(struct pci_dev *pdev,
 140                                   const struct pci_device_id *id)
 141 {
 142         int err;
 143         u8 scfg;
 144         u32 temp;
 145         u8 model, stepping;
 146         struct k8temp_data *data;
 147
 148         if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
 149                 err = -ENOMEM;
 150                 goto exit;
 151         }
 152
 153         model = boot_cpu_data.x86_model;
 154         stepping = boot_cpu_data.x86_mask;
 155
 156         switch (boot_cpu_data.x86) {
 157         case 0xf:
 158                 /* feature available since SH-C0, exclude older revisions */
 159                 if (((model == 4) && (stepping == 0)) ||
 160                     ((model == 5) && (stepping <= 1))) {
 161                         err = -ENODEV;
 162                         goto exit_free;
 163                 }
 164
 165                 if (model >= 0x40) {
 166                         dev_warn(&pdev->dev, "Temperature readouts might be "
 167                                  "wrong - check erratum #141\n");
 168                 }
 169
 170                 break;
 171         }
 172
 173         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 174         scfg &= ~(SEL_PLACE | SEL_CORE);                /* Select sensor 0, core0 */
 175         pci_write_config_byte(pdev, REG_TEMP, scfg);
 176         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 177
 178         if (scfg & (SEL_PLACE | SEL_CORE)) {
 179                 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
 180                 err = -ENODEV;
 181                 goto exit_free;
 182         }
 183
 184         scfg |= (SEL_PLACE | SEL_CORE);
 185         pci_write_config_byte(pdev, REG_TEMP, scfg);
 186
 187         /* now we know if we can change core and/or sensor */
 188         pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
 189
 190         if (data->sensorsp & SEL_PLACE) {
 191                 scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
 192                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 193                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 194                 scfg |= SEL_CORE;       /* prepare for next selection */
 195                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 196                         data->sensorsp &= ~SEL_PLACE;
 197         }
 198
 199         if (data->sensorsp & SEL_CORE) {
 200                 scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
 201                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 202                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 203                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 204                         data->sensorsp &= ~SEL_CORE;
 205         }
 206
 207         data->name = "k8temp";
 208         mutex_init(&data->update_lock);
 209         dev_set_drvdata(&pdev->dev, data);
 210
 211         /* Register sysfs hooks */
 212         err = device_create_file(&pdev->dev,
 213                            &sensor_dev_attr_temp1_input.dev_attr);
 214         if (err)
 215                 goto exit_remove;
 216
 217         /* sensor can be changed and reports something */
 218         if (data->sensorsp & SEL_PLACE) {
 219                 err = device_create_file(&pdev->dev,
 220                                    &sensor_dev_attr_temp2_input.dev_attr);
 221                 if (err)
 222                         goto exit_remove;
 223         }
 224
 225         /* core can be changed and reports something */
 226         if (data->sensorsp & SEL_CORE) {
 227                 err = device_create_file(&pdev->dev,
 228                                    &sensor_dev_attr_temp3_input.dev_attr);
 229                 if (err)
 230                         goto exit_remove;
 231                 if (data->sensorsp & SEL_PLACE)
 232                         err = device_create_file(&pdev->dev,
 233                                            &sensor_dev_attr_temp4_input.
 234                                            dev_attr);
 235                         if (err)
 236                                 goto exit_remove;
 237         }
 238
 239         err = device_create_file(&pdev->dev, &dev_attr_name);
 240         if (err)
 241                 goto exit_remove;
 242
 243         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 244
 245         if (IS_ERR(data->hwmon_dev)) {
 246                 err = PTR_ERR(data->hwmon_dev);
 247                 goto exit_remove;
 248         }
 249
 250         return 0;
 251
 252 exit_remove:
 253         device_remove_file(&pdev->dev,
 254                            &sensor_dev_attr_temp1_input.dev_attr);
 255         device_remove_file(&pdev->dev,
 256                            &sensor_dev_attr_temp2_input.dev_attr);
 257         device_remove_file(&pdev->dev,
 258                            &sensor_dev_attr_temp3_input.dev_attr);
 259         device_remove_file(&pdev->dev,
 260                            &sensor_dev_attr_temp4_input.dev_attr);
 261         device_remove_file(&pdev->dev, &dev_attr_name);
 262 exit_free:
 263         dev_set_drvdata(&pdev->dev, NULL);
 264         kfree(data);
 265 exit:
 266         return err;
 267 }
 268
 269 static void __devexit k8temp_remove(struct pci_dev *pdev)
 270 {
 271         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
 272
 273         hwmon_device_unregister(data->hwmon_dev);
 274         device_remove_file(&pdev->dev,
 275                            &sensor_dev_attr_temp1_input.dev_attr);
 276         device_remove_file(&pdev->dev,
 277                            &sensor_dev_attr_temp2_input.dev_attr);
 278         device_remove_file(&pdev->dev,
 279                            &sensor_dev_attr_temp3_input.dev_attr);
 280         device_remove_file(&pdev->dev,
 281                            &sensor_dev_attr_temp4_input.dev_attr);
 282         device_remove_file(&pdev->dev, &dev_attr_name);
 283         dev_set_drvdata(&pdev->dev, NULL);
 284         kfree(data);
 285 }
 286
 287 static struct pci_driver k8temp_driver = {
 288         .name = "k8temp",
 289         .id_table = k8temp_ids,
 290         .probe = k8temp_probe,
 291         .remove = __devexit_p(k8temp_remove),
 292 };
 293
 294 static int __init k8temp_init(void)
 295 {
 296         return pci_register_driver(&k8temp_driver);
 297 }
 298
 299 static void __exit k8temp_exit(void)
 300 {
 301         pci_unregister_driver(&k8temp_driver);
 302 }
 303
 304 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 305 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 306 MODULE_LICENSE("GPL");
 307
 308 module_init(k8temp_init)
 309 module_exit(k8temp_exit)