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 && (data->sensorsp & SEL_CORE))
 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 const 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                       model == 0x6b || model == 0x6f || model == 0x7f)) {
 185                         /*
 186                          * RevG desktop CPUs (i.e. no socket S1G1 or
 187                          * ASB1 parts) need additional offset,
 188                          * otherwise reported temperature is below
 189                          * ambient temperature
 190                          */
 191                         data->temp_offset = 21000;
 192                 }
 193
 194                 break;
 195         }
 196
 197         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 198         scfg &= ~(SEL_PLACE | SEL_CORE);                /* Select sensor 0, core0 */
 199         pci_write_config_byte(pdev, REG_TEMP, scfg);
 200         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 201
 202         if (scfg & (SEL_PLACE | SEL_CORE)) {
 203                 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
 204                 err = -ENODEV;
 205                 goto exit_free;
 206         }
 207
 208         scfg |= (SEL_PLACE | SEL_CORE);
 209         pci_write_config_byte(pdev, REG_TEMP, scfg);
 210
 211         /* now we know if we can change core and/or sensor */
 212         pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
 213
 214         if (data->sensorsp & SEL_PLACE) {
 215                 scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
 216                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 217                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 218                 scfg |= SEL_CORE;       /* prepare for next selection */
 219                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 220                         data->sensorsp &= ~SEL_PLACE;
 221         }
 222
 223         if (data->sensorsp & SEL_CORE) {
 224                 scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
 225                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 226                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 227                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 228                         data->sensorsp &= ~SEL_CORE;
 229         }
 230
 231         data->name = "k8temp";
 232         mutex_init(&data->update_lock);
 233         dev_set_drvdata(&pdev->dev, data);
 234
 235         /* Register sysfs hooks */
 236         err = device_create_file(&pdev->dev,
 237                            &sensor_dev_attr_temp1_input.dev_attr);
 238         if (err)
 239                 goto exit_remove;
 240
 241         /* sensor can be changed and reports something */
 242         if (data->sensorsp & SEL_PLACE) {
 243                 err = device_create_file(&pdev->dev,
 244                                    &sensor_dev_attr_temp2_input.dev_attr);
 245                 if (err)
 246                         goto exit_remove;
 247         }
 248
 249         /* core can be changed and reports something */
 250         if (data->sensorsp & SEL_CORE) {
 251                 err = device_create_file(&pdev->dev,
 252                                    &sensor_dev_attr_temp3_input.dev_attr);
 253                 if (err)
 254                         goto exit_remove;
 255                 if (data->sensorsp & SEL_PLACE) {
 256                         err = device_create_file(&pdev->dev,
 257                                            &sensor_dev_attr_temp4_input.
 258                                            dev_attr);
 259                         if (err)
 260                                 goto exit_remove;
 261                 }
 262         }
 263
 264         err = device_create_file(&pdev->dev, &dev_attr_name);
 265         if (err)
 266                 goto exit_remove;
 267
 268         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 269
 270         if (IS_ERR(data->hwmon_dev)) {
 271                 err = PTR_ERR(data->hwmon_dev);
 272                 goto exit_remove;
 273         }
 274
 275         return 0;
 276
 277 exit_remove:
 278         device_remove_file(&pdev->dev,
 279                            &sensor_dev_attr_temp1_input.dev_attr);
 280         device_remove_file(&pdev->dev,
 281                            &sensor_dev_attr_temp2_input.dev_attr);
 282         device_remove_file(&pdev->dev,
 283                            &sensor_dev_attr_temp3_input.dev_attr);
 284         device_remove_file(&pdev->dev,
 285                            &sensor_dev_attr_temp4_input.dev_attr);
 286         device_remove_file(&pdev->dev, &dev_attr_name);
 287 exit_free:
 288         dev_set_drvdata(&pdev->dev, NULL);
 289         kfree(data);
 290 exit:
 291         return err;
 292 }
 293
 294 static void __devexit k8temp_remove(struct pci_dev *pdev)
 295 {
 296         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
 297
 298         hwmon_device_unregister(data->hwmon_dev);
 299         device_remove_file(&pdev->dev,
 300                            &sensor_dev_attr_temp1_input.dev_attr);
 301         device_remove_file(&pdev->dev,
 302                            &sensor_dev_attr_temp2_input.dev_attr);
 303         device_remove_file(&pdev->dev,
 304                            &sensor_dev_attr_temp3_input.dev_attr);
 305         device_remove_file(&pdev->dev,
 306                            &sensor_dev_attr_temp4_input.dev_attr);
 307         device_remove_file(&pdev->dev, &dev_attr_name);
 308         dev_set_drvdata(&pdev->dev, NULL);
 309         kfree(data);
 310 }
 311
 312 static struct pci_driver k8temp_driver = {
 313         .name = "k8temp",
 314         .id_table = k8temp_ids,
 315         .probe = k8temp_probe,
 316         .remove = __devexit_p(k8temp_remove),
 317 };
 318
 319 static int __init k8temp_init(void)
 320 {
 321         return pci_register_driver(&k8temp_driver);
 322 }
 323
 324 static void __exit k8temp_exit(void)
 325 {
 326         pci_unregister_driver(&k8temp_driver);
 327 }
 328
 329 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 330 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 331 MODULE_LICENSE("GPL");
 332
 333 module_init(k8temp_init)
 334 module_exit(k8temp_exit)