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 };
  53
  54 static struct k8temp_data *k8temp_update_device(struct device *dev)
  55 {
  56         struct k8temp_data *data = dev_get_drvdata(dev);
  57         struct pci_dev *pdev = to_pci_dev(dev);
  58         u8 tmp;
  59
  60         mutex_lock(&data->update_lock);
  61
  62         if (!data->valid
  63             || time_after(jiffies, data->last_updated + HZ)) {
  64                 pci_read_config_byte(pdev, REG_TEMP, &tmp);
  65                 tmp &= ~(SEL_PLACE | SEL_CORE);         /* Select sensor 0, core0 */
  66                 pci_write_config_byte(pdev, REG_TEMP, tmp);
  67                 pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
  68
  69                 if (data->sensorsp & SEL_PLACE) {
  70                         tmp |= SEL_PLACE;       /* Select sensor 1, core0 */
  71                         pci_write_config_byte(pdev, REG_TEMP, tmp);
  72                         pci_read_config_dword(pdev, REG_TEMP,
  73                                               &data->temp[0][1]);
  74                 }
  75
  76                 if (data->sensorsp & SEL_CORE) {
  77                         tmp &= ~SEL_PLACE;      /* Select sensor 0, core1 */
  78                         tmp |= SEL_CORE;
  79                         pci_write_config_byte(pdev, REG_TEMP, tmp);
  80                         pci_read_config_dword(pdev, REG_TEMP,
  81                                               &data->temp[1][0]);
  82
  83                         if (data->sensorsp & SEL_PLACE) {
  84                                 tmp |= SEL_PLACE;       /* Select sensor 1, core1 */
  85                                 pci_write_config_byte(pdev, REG_TEMP, tmp);
  86                                 pci_read_config_dword(pdev, REG_TEMP,
  87                                                       &data->temp[1][1]);
  88                         }
  89                 }
  90
  91                 data->last_updated = jiffies;
  92                 data->valid = 1;
  93         }
  94
  95         mutex_unlock(&data->update_lock);
  96         return data;
  97 }
  98
  99 /*
 100  * Sysfs stuff
 101  */
 102
 103 static ssize_t show_name(struct device *dev, struct device_attribute
 104                          *devattr, char *buf)
 105 {
 106         struct k8temp_data *data = dev_get_drvdata(dev);
 107
 108         return sprintf(buf, "%s\n", data->name);
 109 }
 110
 111
 112 static ssize_t show_temp(struct device *dev,
 113                          struct device_attribute *devattr, char *buf)
 114 {
 115         struct sensor_device_attribute_2 *attr =
 116             to_sensor_dev_attr_2(devattr);
 117         int core = attr->nr;
 118         int place = attr->index;
 119         struct k8temp_data *data = k8temp_update_device(dev);
 120
 121         if (data->swap_core_select)
 122                 core = core ? 0 : 1;
 123
 124         return sprintf(buf, "%d\n",
 125                        TEMP_FROM_REG(data->temp[core][place]));
 126 }
 127
 128 /* core, place */
 129
 130 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 131 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 132 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
 133 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
 134 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 135
 136 static struct pci_device_id k8temp_ids[] = {
 137         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
 138         { 0 },
 139 };
 140
 141 MODULE_DEVICE_TABLE(pci, k8temp_ids);
 142
 143 static int __devinit k8temp_probe(struct pci_dev *pdev,
 144                                   const struct pci_device_id *id)
 145 {
 146         int err;
 147         u8 scfg;
 148         u32 temp;
 149         u8 model, stepping;
 150         struct k8temp_data *data;
 151
 152         if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
 153                 err = -ENOMEM;
 154                 goto exit;
 155         }
 156
 157         model = boot_cpu_data.x86_model;
 158         stepping = boot_cpu_data.x86_mask;
 159
 160         switch (boot_cpu_data.x86) {
 161         case 0xf:
 162                 /* feature available since SH-C0, exclude older revisions */
 163                 if (((model == 4) && (stepping == 0)) ||
 164                     ((model == 5) && (stepping <= 1))) {
 165                         err = -ENODEV;
 166                         goto exit_free;
 167                 }
 168
 169                 /*
 170                  * AMD NPT family 0fh, i.e. RevF and RevG:
 171                  * meaning of SEL_CORE bit is inverted
 172                  */
 173                 if (model >= 0x40) {
 174                         data->swap_core_select = 1;
 175                         dev_warn(&pdev->dev, "Temperature readouts might be "
 176                                  "wrong - check erratum #141\n");
 177                 }
 178
 179                 break;
 180         }
 181
 182         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 183         scfg &= ~(SEL_PLACE | SEL_CORE);                /* Select sensor 0, core0 */
 184         pci_write_config_byte(pdev, REG_TEMP, scfg);
 185         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 186
 187         if (scfg & (SEL_PLACE | SEL_CORE)) {
 188                 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
 189                 err = -ENODEV;
 190                 goto exit_free;
 191         }
 192
 193         scfg |= (SEL_PLACE | SEL_CORE);
 194         pci_write_config_byte(pdev, REG_TEMP, scfg);
 195
 196         /* now we know if we can change core and/or sensor */
 197         pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
 198
 199         if (data->sensorsp & SEL_PLACE) {
 200                 scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
 201                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 202                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 203                 scfg |= SEL_CORE;       /* prepare for next selection */
 204                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 205                         data->sensorsp &= ~SEL_PLACE;
 206         }
 207
 208         if (data->sensorsp & SEL_CORE) {
 209                 scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
 210                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 211                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 212                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 213                         data->sensorsp &= ~SEL_CORE;
 214         }
 215
 216         data->name = "k8temp";
 217         mutex_init(&data->update_lock);
 218         dev_set_drvdata(&pdev->dev, data);
 219
 220         /* Register sysfs hooks */
 221         err = device_create_file(&pdev->dev,
 222                            &sensor_dev_attr_temp1_input.dev_attr);
 223         if (err)
 224                 goto exit_remove;
 225
 226         /* sensor can be changed and reports something */
 227         if (data->sensorsp & SEL_PLACE) {
 228                 err = device_create_file(&pdev->dev,
 229                                    &sensor_dev_attr_temp2_input.dev_attr);
 230                 if (err)
 231                         goto exit_remove;
 232         }
 233
 234         /* core can be changed and reports something */
 235         if (data->sensorsp & SEL_CORE) {
 236                 err = device_create_file(&pdev->dev,
 237                                    &sensor_dev_attr_temp3_input.dev_attr);
 238                 if (err)
 239                         goto exit_remove;
 240                 if (data->sensorsp & SEL_PLACE)
 241                         err = device_create_file(&pdev->dev,
 242                                            &sensor_dev_attr_temp4_input.
 243                                            dev_attr);
 244                         if (err)
 245                                 goto exit_remove;
 246         }
 247
 248         err = device_create_file(&pdev->dev, &dev_attr_name);
 249         if (err)
 250                 goto exit_remove;
 251
 252         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 253
 254         if (IS_ERR(data->hwmon_dev)) {
 255                 err = PTR_ERR(data->hwmon_dev);
 256                 goto exit_remove;
 257         }
 258
 259         return 0;
 260
 261 exit_remove:
 262         device_remove_file(&pdev->dev,
 263                            &sensor_dev_attr_temp1_input.dev_attr);
 264         device_remove_file(&pdev->dev,
 265                            &sensor_dev_attr_temp2_input.dev_attr);
 266         device_remove_file(&pdev->dev,
 267                            &sensor_dev_attr_temp3_input.dev_attr);
 268         device_remove_file(&pdev->dev,
 269                            &sensor_dev_attr_temp4_input.dev_attr);
 270         device_remove_file(&pdev->dev, &dev_attr_name);
 271 exit_free:
 272         dev_set_drvdata(&pdev->dev, NULL);
 273         kfree(data);
 274 exit:
 275         return err;
 276 }
 277
 278 static void __devexit k8temp_remove(struct pci_dev *pdev)
 279 {
 280         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
 281
 282         hwmon_device_unregister(data->hwmon_dev);
 283         device_remove_file(&pdev->dev,
 284                            &sensor_dev_attr_temp1_input.dev_attr);
 285         device_remove_file(&pdev->dev,
 286                            &sensor_dev_attr_temp2_input.dev_attr);
 287         device_remove_file(&pdev->dev,
 288                            &sensor_dev_attr_temp3_input.dev_attr);
 289         device_remove_file(&pdev->dev,
 290                            &sensor_dev_attr_temp4_input.dev_attr);
 291         device_remove_file(&pdev->dev, &dev_attr_name);
 292         dev_set_drvdata(&pdev->dev, NULL);
 293         kfree(data);
 294 }
 295
 296 static struct pci_driver k8temp_driver = {
 297         .name = "k8temp",
 298         .id_table = k8temp_ids,
 299         .probe = k8temp_probe,
 300         .remove = __devexit_p(k8temp_remove),
 301 };
 302
 303 static int __init k8temp_init(void)
 304 {
 305         return pci_register_driver(&k8temp_driver);
 306 }
 307
 308 static void __exit k8temp_exit(void)
 309 {
 310         pci_unregister_driver(&k8temp_driver);
 311 }
 312
 313 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 314 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 315 MODULE_LICENSE("GPL");
 316
 317 module_init(k8temp_init)
 318 module_exit(k8temp_exit)