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
  35 #define TEMP_FROM_REG(val)      (((((val) >> 16) & 0xff) - 49) * 1000)
  36 #define REG_TEMP        0xe4
  37 #define SEL_PLACE       0x40
  38 #define SEL_CORE        0x04
  39
  40 struct k8temp_data {
  41         struct device *hwmon_dev;
  42         struct mutex update_lock;
  43         const char *name;
  44         char valid;             /* zero until following fields are valid */
  45         unsigned long last_updated;     /* in jiffies */
  46
  47         /* registers values */
  48         u8 sensorsp;            /* sensor presence bits - SEL_CORE & SEL_PLACE */
  49         u32 temp[2][2];         /* core, place */
  50 };
  51
  52 static struct k8temp_data *k8temp_update_device(struct device *dev)
  53 {
  54         struct k8temp_data *data = dev_get_drvdata(dev);
  55         struct pci_dev *pdev = to_pci_dev(dev);
  56         u8 tmp;
  57
  58         mutex_lock(&data->update_lock);
  59
  60         if (!data->valid
  61             || time_after(jiffies, data->last_updated + HZ)) {
  62                 pci_read_config_byte(pdev, REG_TEMP, &tmp);
  63                 tmp &= ~(SEL_PLACE | SEL_CORE);         /* Select sensor 0, core0 */
  64                 pci_write_config_byte(pdev, REG_TEMP, tmp);
  65                 pci_read_config_dword(pdev, REG_TEMP, &data->temp[0][0]);
  66
  67                 if (data->sensorsp & SEL_PLACE) {
  68                         tmp |= SEL_PLACE;       /* Select sensor 1, core0 */
  69                         pci_write_config_byte(pdev, REG_TEMP, tmp);
  70                         pci_read_config_dword(pdev, REG_TEMP,
  71                                               &data->temp[0][1]);
  72                 }
  73
  74                 if (data->sensorsp & SEL_CORE) {
  75                         tmp &= ~SEL_PLACE;      /* Select sensor 0, core1 */
  76                         tmp |= SEL_CORE;
  77                         pci_write_config_byte(pdev, REG_TEMP, tmp);
  78                         pci_read_config_dword(pdev, REG_TEMP,
  79                                               &data->temp[1][0]);
  80
  81                         if (data->sensorsp & SEL_PLACE) {
  82                                 tmp |= SEL_PLACE;       /* Select sensor 1, core1 */
  83                                 pci_write_config_byte(pdev, REG_TEMP, tmp);
  84                                 pci_read_config_dword(pdev, REG_TEMP,
  85                                                       &data->temp[1][1]);
  86                         }
  87                 }
  88
  89                 data->last_updated = jiffies;
  90                 data->valid = 1;
  91         }
  92
  93         mutex_unlock(&data->update_lock);
  94         return data;
  95 }
  96
  97 /*
  98  * Sysfs stuff
  99  */
 100
 101 static ssize_t show_name(struct device *dev, struct device_attribute
 102                          *devattr, char *buf)
 103 {
 104         struct k8temp_data *data = dev_get_drvdata(dev);
 105
 106         return sprintf(buf, "%s\n", data->name);
 107 }
 108
 109
 110 static ssize_t show_temp(struct device *dev,
 111                          struct device_attribute *devattr, char *buf)
 112 {
 113         struct sensor_device_attribute_2 *attr =
 114             to_sensor_dev_attr_2(devattr);
 115         int core = attr->nr;
 116         int place = attr->index;
 117         struct k8temp_data *data = k8temp_update_device(dev);
 118
 119         return sprintf(buf, "%d\n",
 120                        TEMP_FROM_REG(data->temp[core][place]));
 121 }
 122
 123 /* core, place */
 124
 125 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
 126 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
 127 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 1, 0);
 128 static SENSOR_DEVICE_ATTR_2(temp4_input, S_IRUGO, show_temp, NULL, 1, 1);
 129 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 130
 131 static struct pci_device_id k8temp_ids[] = {
 132         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
 133         { 0 },
 134 };
 135
 136 MODULE_DEVICE_TABLE(pci, k8temp_ids);
 137
 138 static int __devinit k8temp_probe(struct pci_dev *pdev,
 139                                   const struct pci_device_id *id)
 140 {
 141         int err;
 142         u8 scfg;
 143         u32 temp;
 144         struct k8temp_data *data;
 145         u32 cpuid = cpuid_eax(1);
 146
 147         /* this feature should be available since SH-C0 core */
 148         if ((cpuid == 0xf40) || (cpuid == 0xf50) || (cpuid == 0xf51)) {
 149                 err = -ENODEV;
 150                 goto exit;
 151         }
 152
 153         if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
 154                 err = -ENOMEM;
 155                 goto exit;
 156         }
 157
 158         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 159         scfg &= ~(SEL_PLACE | SEL_CORE);                /* Select sensor 0, core0 */
 160         pci_write_config_byte(pdev, REG_TEMP, scfg);
 161         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 162
 163         if (scfg & (SEL_PLACE | SEL_CORE)) {
 164                 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
 165                 err = -ENODEV;
 166                 goto exit_free;
 167         }
 168
 169         scfg |= (SEL_PLACE | SEL_CORE);
 170         pci_write_config_byte(pdev, REG_TEMP, scfg);
 171
 172         /* now we know if we can change core and/or sensor */
 173         pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
 174
 175         if (data->sensorsp & SEL_PLACE) {
 176                 scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
 177                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 178                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 179                 scfg |= SEL_CORE;       /* prepare for next selection */
 180                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 181                         data->sensorsp &= ~SEL_PLACE;
 182         }
 183
 184         if (data->sensorsp & SEL_CORE) {
 185                 scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
 186                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 187                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 188                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 189                         data->sensorsp &= ~SEL_CORE;
 190         }
 191
 192         data->name = "k8temp";
 193         mutex_init(&data->update_lock);
 194         dev_set_drvdata(&pdev->dev, data);
 195
 196         /* Register sysfs hooks */
 197         err = device_create_file(&pdev->dev,
 198                            &sensor_dev_attr_temp1_input.dev_attr);
 199         if (err)
 200                 goto exit_remove;
 201
 202         /* sensor can be changed and reports something */
 203         if (data->sensorsp & SEL_PLACE) {
 204                 err = device_create_file(&pdev->dev,
 205                                    &sensor_dev_attr_temp2_input.dev_attr);
 206                 if (err)
 207                         goto exit_remove;
 208         }
 209
 210         /* core can be changed and reports something */
 211         if (data->sensorsp & SEL_CORE) {
 212                 err = device_create_file(&pdev->dev,
 213                                    &sensor_dev_attr_temp3_input.dev_attr);
 214                 if (err)
 215                         goto exit_remove;
 216                 if (data->sensorsp & SEL_PLACE)
 217                         err = device_create_file(&pdev->dev,
 218                                            &sensor_dev_attr_temp4_input.
 219                                            dev_attr);
 220                         if (err)
 221                                 goto exit_remove;
 222         }
 223
 224         err = device_create_file(&pdev->dev, &dev_attr_name);
 225         if (err)
 226                 goto exit_remove;
 227
 228         data->hwmon_dev = hwmon_device_register(&pdev->dev);
 229
 230         if (IS_ERR(data->hwmon_dev)) {
 231                 err = PTR_ERR(data->hwmon_dev);
 232                 goto exit_remove;
 233         }
 234
 235         return 0;
 236
 237 exit_remove:
 238         device_remove_file(&pdev->dev,
 239                            &sensor_dev_attr_temp1_input.dev_attr);
 240         device_remove_file(&pdev->dev,
 241                            &sensor_dev_attr_temp2_input.dev_attr);
 242         device_remove_file(&pdev->dev,
 243                            &sensor_dev_attr_temp3_input.dev_attr);
 244         device_remove_file(&pdev->dev,
 245                            &sensor_dev_attr_temp4_input.dev_attr);
 246         device_remove_file(&pdev->dev, &dev_attr_name);
 247 exit_free:
 248         dev_set_drvdata(&pdev->dev, NULL);
 249         kfree(data);
 250 exit:
 251         return err;
 252 }
 253
 254 static void __devexit k8temp_remove(struct pci_dev *pdev)
 255 {
 256         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
 257
 258         hwmon_device_unregister(data->hwmon_dev);
 259         device_remove_file(&pdev->dev,
 260                            &sensor_dev_attr_temp1_input.dev_attr);
 261         device_remove_file(&pdev->dev,
 262                            &sensor_dev_attr_temp2_input.dev_attr);
 263         device_remove_file(&pdev->dev,
 264                            &sensor_dev_attr_temp3_input.dev_attr);
 265         device_remove_file(&pdev->dev,
 266                            &sensor_dev_attr_temp4_input.dev_attr);
 267         device_remove_file(&pdev->dev, &dev_attr_name);
 268         dev_set_drvdata(&pdev->dev, NULL);
 269         kfree(data);
 270 }
 271
 272 static struct pci_driver k8temp_driver = {
 273         .name = "k8temp",
 274         .id_table = k8temp_ids,
 275         .probe = k8temp_probe,
 276         .remove = __devexit_p(k8temp_remove),
 277 };
 278
 279 static int __init k8temp_init(void)
 280 {
 281         return pci_register_driver(&k8temp_driver);
 282 }
 283
 284 static void __exit k8temp_exit(void)
 285 {
 286         pci_unregister_driver(&k8temp_driver);
 287 }
 288
 289 MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
 290 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 291 MODULE_LICENSE("GPL");
 292
 293 module_init(k8temp_init)
 294 module_exit(k8temp_exit)