drivers/hwmon/k8temp.c

   1 /*
   2  * k8temp.c - Linux kernel module for hardware monitoring
   3  *
   4  * Copyright (C) 2006 Rudolf Marek <r.marek@sh.cvut.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 class_device *class_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 static int __devinit k8temp_probe(struct pci_dev *pdev,
 137                                   const struct pci_device_id *id)
 138 {
 139         int err;
 140         u8 scfg;
 141         u32 temp;
 142         struct k8temp_data *data;
 143         u32 cpuid = cpuid_eax(1);
 144
 145         /* this feature should be available since SH-C0 core */
 146         if ((cpuid == 0xf40) || (cpuid == 0xf50) || (cpuid == 0xf51)) {
 147                 err = -ENODEV;
 148                 goto exit;
 149         }
 150
 151         if (!(data = kzalloc(sizeof(struct k8temp_data), GFP_KERNEL))) {
 152                 err = -ENOMEM;
 153                 goto exit;
 154         }
 155
 156         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 157         scfg &= ~(SEL_PLACE | SEL_CORE);                /* Select sensor 0, core0 */
 158         pci_write_config_byte(pdev, REG_TEMP, scfg);
 159         pci_read_config_byte(pdev, REG_TEMP, &scfg);
 160
 161         if (scfg & (SEL_PLACE | SEL_CORE)) {
 162                 dev_err(&pdev->dev, "Configuration bit(s) stuck at 1!\n");
 163                 err = -ENODEV;
 164                 goto exit_free;
 165         }
 166
 167         scfg |= (SEL_PLACE | SEL_CORE);
 168         pci_write_config_byte(pdev, REG_TEMP, scfg);
 169
 170         /* now we know if we can change core and/or sensor */
 171         pci_read_config_byte(pdev, REG_TEMP, &data->sensorsp);
 172
 173         if (data->sensorsp & SEL_PLACE) {
 174                 scfg &= ~SEL_CORE;      /* Select sensor 1, core0 */
 175                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 176                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 177                 scfg |= SEL_CORE;       /* prepare for next selection */
 178                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 179                         data->sensorsp &= ~SEL_PLACE;
 180         }
 181
 182         if (data->sensorsp & SEL_CORE) {
 183                 scfg &= ~SEL_PLACE;     /* Select sensor 0, core1 */
 184                 pci_write_config_byte(pdev, REG_TEMP, scfg);
 185                 pci_read_config_dword(pdev, REG_TEMP, &temp);
 186                 if (!((temp >> 16) & 0xff))     /* if temp is 0 -49C is not likely */
 187                         data->sensorsp &= ~SEL_CORE;
 188         }
 189
 190         data->name = "k8temp";
 191         mutex_init(&data->update_lock);
 192         dev_set_drvdata(&pdev->dev, data);
 193
 194         /* Register sysfs hooks */
 195         err = device_create_file(&pdev->dev,
 196                            &sensor_dev_attr_temp1_input.dev_attr);
 197         if (err)
 198                 goto exit_remove;
 199
 200         /* sensor can be changed and reports something */
 201         if (data->sensorsp & SEL_PLACE) {
 202                 err = device_create_file(&pdev->dev,
 203                                    &sensor_dev_attr_temp2_input.dev_attr);
 204                 if (err)
 205                         goto exit_remove;
 206         }
 207
 208         /* core can be changed and reports something */
 209         if (data->sensorsp & SEL_CORE) {
 210                 err = device_create_file(&pdev->dev,
 211                                    &sensor_dev_attr_temp3_input.dev_attr);
 212                 if (err)
 213                         goto exit_remove;
 214                 if (data->sensorsp & SEL_PLACE)
 215                         err = device_create_file(&pdev->dev,
 216                                            &sensor_dev_attr_temp4_input.
 217                                            dev_attr);
 218                         if (err)
 219                                 goto exit_remove;
 220         }
 221
 222         err = device_create_file(&pdev->dev, &dev_attr_name);
 223         if (err)
 224                 goto exit_remove;
 225
 226         data->class_dev = hwmon_device_register(&pdev->dev);
 227
 228         if (IS_ERR(data->class_dev)) {
 229                 err = PTR_ERR(data->class_dev);
 230                 goto exit_remove;
 231         }
 232
 233         return 0;
 234
 235 exit_remove:
 236         device_remove_file(&pdev->dev,
 237                            &sensor_dev_attr_temp1_input.dev_attr);
 238         device_remove_file(&pdev->dev,
 239                            &sensor_dev_attr_temp2_input.dev_attr);
 240         device_remove_file(&pdev->dev,
 241                            &sensor_dev_attr_temp3_input.dev_attr);
 242         device_remove_file(&pdev->dev,
 243                            &sensor_dev_attr_temp4_input.dev_attr);
 244         device_remove_file(&pdev->dev, &dev_attr_name);
 245 exit_free:
 246         dev_set_drvdata(&pdev->dev, NULL);
 247         kfree(data);
 248 exit:
 249         return err;
 250 }
 251
 252 static void __devexit k8temp_remove(struct pci_dev *pdev)
 253 {
 254         struct k8temp_data *data = dev_get_drvdata(&pdev->dev);
 255
 256         hwmon_device_unregister(data->class_dev);
 257         device_remove_file(&pdev->dev,
 258                            &sensor_dev_attr_temp1_input.dev_attr);
 259         device_remove_file(&pdev->dev,
 260                            &sensor_dev_attr_temp2_input.dev_attr);
 261         device_remove_file(&pdev->dev,
 262                            &sensor_dev_attr_temp3_input.dev_attr);
 263         device_remove_file(&pdev->dev,
 264                            &sensor_dev_attr_temp4_input.dev_attr);
 265         device_remove_file(&pdev->dev, &dev_attr_name);
 266         dev_set_drvdata(&pdev->dev, NULL);
 267         kfree(data);
 268 }
 269
 270 static struct pci_driver k8temp_driver = {
 271         .name = "k8temp",
 272         .id_table = k8temp_ids,
 273         .probe = k8temp_probe,
 274         .remove = __devexit_p(k8temp_remove),
 275 };
 276
 277 static int __init k8temp_init(void)
 278 {
 279         return pci_register_driver(&k8temp_driver);
 280 }
 281
 282 static void __exit k8temp_exit(void)
 283 {
 284         pci_unregister_driver(&k8temp_driver);
 285 }
 286
 287 MODULE_AUTHOR("Rudolf Marek <r.marek@sh.cvut.cz>");
 288 MODULE_DESCRIPTION("AMD K8 core temperature monitor");
 289 MODULE_LICENSE("GPL");
 290
 291 module_init(k8temp_init)
 292 module_exit(k8temp_exit)