drivers/hwmon/adm1025.c

   1 /*
   2  * adm1025.c
   3  *
   4  * Copyright (C) 2000       Chen-Yuan Wu <gwu@esoft.com>
   5  * Copyright (C) 2003-2009  Jean Delvare <khali@linux-fr.org>
   6  *
   7  * The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6
   8  * voltages (including its own power source) and up to two temperatures
   9  * (its own plus up to one external one). Voltages are scaled internally
  10  * (which is not the common way) with ratios such that the nominal value
  11  * of each voltage correspond to a register value of 192 (which means a
  12  * resolution of about 0.5% of the nominal value). Temperature values are
  13  * reported with a 1 deg resolution and a 3 deg accuracy. Complete
  14  * datasheet can be obtained from Analog's website at:
  15  *   http://www.onsemi.com/PowerSolutions/product.do?id=ADM1025
  16  *
  17  * This driver also supports the ADM1025A, which differs from the ADM1025
  18  * only in that it has "open-drain VID inputs while the ADM1025 has
  19  * on-chip 100k pull-ups on the VID inputs". It doesn't make any
  20  * difference for us.
  21  *
  22  * This driver also supports the NE1619, a sensor chip made by Philips.
  23  * That chip is similar to the ADM1025A, with a few differences. The only
  24  * difference that matters to us is that the NE1619 has only two possible
  25  * addresses while the ADM1025A has a third one. Complete datasheet can be
  26  * obtained from Philips's website at:
  27  *   http://www.semiconductors.philips.com/pip/NE1619DS.html
  28  *
  29  * Since the ADM1025 was the first chipset supported by this driver, most
  30  * comments will refer to this chipset, but are actually general and
  31  * concern all supported chipsets, unless mentioned otherwise.
  32  *
  33  * This program is free software; you can redistribute it and/or modify
  34  * it under the terms of the GNU General Public License as published by
  35  * the Free Software Foundation; either version 2 of the License, or
  36  * (at your option) any later version.
  37  *
  38  * This program is distributed in the hope that it will be useful,
  39  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  40  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  41  * GNU General Public License for more details.
  42  *
  43  * You should have received a copy of the GNU General Public License
  44  * along with this program; if not, write to the Free Software
  45  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  46  */
  47
  48 #include <linux/module.h>
  49 #include <linux/init.h>
  50 #include <linux/slab.h>
  51 #include <linux/jiffies.h>
  52 #include <linux/i2c.h>
  53 #include <linux/hwmon.h>
  54 #include <linux/hwmon-sysfs.h>
  55 #include <linux/hwmon-vid.h>
  56 #include <linux/err.h>
  57 #include <linux/mutex.h>
  58
  59 /*
  60  * Addresses to scan
  61  * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e.
  62  * NE1619 has two possible addresses: 0x2c and 0x2d.
  63  */
  64
  65 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  66
  67 enum chips { adm1025, ne1619 };
  68
  69 /*
  70  * The ADM1025 registers
  71  */
  72
  73 #define ADM1025_REG_MAN_ID              0x3E
  74 #define ADM1025_REG_CHIP_ID             0x3F
  75 #define ADM1025_REG_CONFIG              0x40
  76 #define ADM1025_REG_STATUS1             0x41
  77 #define ADM1025_REG_STATUS2             0x42
  78 #define ADM1025_REG_IN(nr)              (0x20 + (nr))
  79 #define ADM1025_REG_IN_MAX(nr)          (0x2B + (nr) * 2)
  80 #define ADM1025_REG_IN_MIN(nr)          (0x2C + (nr) * 2)
  81 #define ADM1025_REG_TEMP(nr)            (0x26 + (nr))
  82 #define ADM1025_REG_TEMP_HIGH(nr)       (0x37 + (nr) * 2)
  83 #define ADM1025_REG_TEMP_LOW(nr)        (0x38 + (nr) * 2)
  84 #define ADM1025_REG_VID                 0x47
  85 #define ADM1025_REG_VID4                0x49
  86
  87 /*
  88  * Conversions and various macros
  89  * The ADM1025 uses signed 8-bit values for temperatures.
  90  */
  91
  92 static const int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
  93
  94 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
  95 #define IN_TO_REG(val, scale)   ((val) <= 0 ? 0 : \
  96                                  (val) * 192 >= (scale) * 255 ? 255 : \
  97                                  ((val) * 192 + (scale) / 2) / (scale))
  98
  99 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 100 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 101                                  (val) >= 126500 ? 127 : \
 102                                  (((val) < 0 ? (val) - 500 : \
 103                                    (val) + 500) / 1000))
 104
 105 /*
 106  * Functions declaration
 107  */
 108
 109 static int adm1025_probe(struct i2c_client *client,
 110                          const struct i2c_device_id *id);
 111 static int adm1025_detect(struct i2c_client *client,
 112                           struct i2c_board_info *info);
 113 static void adm1025_init_client(struct i2c_client *client);
 114 static int adm1025_remove(struct i2c_client *client);
 115 static struct adm1025_data *adm1025_update_device(struct device *dev);
 116
 117 /*
 118  * Driver data (common to all clients)
 119  */
 120
 121 static const struct i2c_device_id adm1025_id[] = {
 122         { "adm1025", adm1025 },
 123         { "ne1619", ne1619 },
 124         { }
 125 };
 126 MODULE_DEVICE_TABLE(i2c, adm1025_id);
 127
 128 static struct i2c_driver adm1025_driver = {
 129         .class          = I2C_CLASS_HWMON,
 130         .driver = {
 131                 .name   = "adm1025",
 132         },
 133         .probe          = adm1025_probe,
 134         .remove         = adm1025_remove,
 135         .id_table       = adm1025_id,
 136         .detect         = adm1025_detect,
 137         .address_list   = normal_i2c,
 138 };
 139
 140 /*
 141  * Client data (each client gets its own)
 142  */
 143
 144 struct adm1025_data {
 145         struct device *hwmon_dev;
 146         struct mutex update_lock;
 147         char valid; /* zero until following fields are valid */
 148         unsigned long last_updated; /* in jiffies */
 149
 150         u8 in[6];               /* register value */
 151         u8 in_max[6];           /* register value */
 152         u8 in_min[6];           /* register value */
 153         s8 temp[2];             /* register value */
 154         s8 temp_min[2];         /* register value */
 155         s8 temp_max[2];         /* register value */
 156         u16 alarms;             /* register values, combined */
 157         u8 vid;                 /* register values, combined */
 158         u8 vrm;
 159 };
 160
 161 /*
 162  * Sysfs stuff
 163  */
 164
 165 static ssize_t
 166 show_in(struct device *dev, struct device_attribute *attr, char *buf)
 167 {
 168         int index = to_sensor_dev_attr(attr)->index;
 169         struct adm1025_data *data = adm1025_update_device(dev);
 170         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
 171                        in_scale[index]));
 172 }
 173
 174 static ssize_t
 175 show_in_min(struct device *dev, struct device_attribute *attr, char *buf)
 176 {
 177         int index = to_sensor_dev_attr(attr)->index;
 178         struct adm1025_data *data = adm1025_update_device(dev);
 179         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index],
 180                        in_scale[index]));
 181 }
 182
 183 static ssize_t
 184 show_in_max(struct device *dev, struct device_attribute *attr, char *buf)
 185 {
 186         int index = to_sensor_dev_attr(attr)->index;
 187         struct adm1025_data *data = adm1025_update_device(dev);
 188         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index],
 189                        in_scale[index]));
 190 }
 191
 192 static ssize_t
 193 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 194 {
 195         int index = to_sensor_dev_attr(attr)->index;
 196         struct adm1025_data *data = adm1025_update_device(dev);
 197         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
 198 }
 199
 200 static ssize_t
 201 show_temp_min(struct device *dev, struct device_attribute *attr, char *buf)
 202 {
 203         int index = to_sensor_dev_attr(attr)->index;
 204         struct adm1025_data *data = adm1025_update_device(dev);
 205         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[index]));
 206 }
 207
 208 static ssize_t
 209 show_temp_max(struct device *dev, struct device_attribute *attr, char *buf)
 210 {
 211         int index = to_sensor_dev_attr(attr)->index;
 212         struct adm1025_data *data = adm1025_update_device(dev);
 213         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
 214 }
 215
 216 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 217                           const char *buf, size_t count)
 218 {
 219         int index = to_sensor_dev_attr(attr)->index;
 220         struct i2c_client *client = to_i2c_client(dev);
 221         struct adm1025_data *data = i2c_get_clientdata(client);
 222         long val;
 223         int err;
 224
 225         err = kstrtol(buf, 10, &val);
 226         if (err)
 227                 return err;
 228
 229         mutex_lock(&data->update_lock);
 230         data->in_min[index] = IN_TO_REG(val, in_scale[index]);
 231         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
 232                                   data->in_min[index]);
 233         mutex_unlock(&data->update_lock);
 234         return count;
 235 }
 236
 237 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 238                           const char *buf, size_t count)
 239 {
 240         int index = to_sensor_dev_attr(attr)->index;
 241         struct i2c_client *client = to_i2c_client(dev);
 242         struct adm1025_data *data = i2c_get_clientdata(client);
 243         long val;
 244         int err;
 245
 246         err = kstrtol(buf, 10, &val);
 247         if (err)
 248                 return err;
 249
 250         mutex_lock(&data->update_lock);
 251         data->in_max[index] = IN_TO_REG(val, in_scale[index]);
 252         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
 253                                   data->in_max[index]);
 254         mutex_unlock(&data->update_lock);
 255         return count;
 256 }
 257
 258 #define set_in(offset) \
 259 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 260         show_in, NULL, offset); \
 261 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
 262         show_in_min, set_in_min, offset); \
 263 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
 264         show_in_max, set_in_max, offset)
 265 set_in(0);
 266 set_in(1);
 267 set_in(2);
 268 set_in(3);
 269 set_in(4);
 270 set_in(5);
 271
 272 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 273                             const char *buf, size_t count)
 274 {
 275         int index = to_sensor_dev_attr(attr)->index;
 276         struct i2c_client *client = to_i2c_client(dev);
 277         struct adm1025_data *data = i2c_get_clientdata(client);
 278         long val;
 279         int err;
 280
 281         err = kstrtol(buf, 10, &val);
 282         if (err)
 283                 return err;
 284
 285         mutex_lock(&data->update_lock);
 286         data->temp_min[index] = TEMP_TO_REG(val);
 287         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
 288                                   data->temp_min[index]);
 289         mutex_unlock(&data->update_lock);
 290         return count;
 291 }
 292
 293 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 294         const char *buf, size_t count)
 295 {
 296         int index = to_sensor_dev_attr(attr)->index;
 297         struct i2c_client *client = to_i2c_client(dev);
 298         struct adm1025_data *data = i2c_get_clientdata(client);
 299         long val;
 300         int err;
 301
 302         err = kstrtol(buf, 10, &val);
 303         if (err)
 304                 return err;
 305
 306         mutex_lock(&data->update_lock);
 307         data->temp_max[index] = TEMP_TO_REG(val);
 308         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
 309                                   data->temp_max[index]);
 310         mutex_unlock(&data->update_lock);
 311         return count;
 312 }
 313
 314 #define set_temp(offset) \
 315 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 316         show_temp, NULL, offset - 1); \
 317 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
 318         show_temp_min, set_temp_min, offset - 1); \
 319 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
 320         show_temp_max, set_temp_max, offset - 1)
 321 set_temp(1);
 322 set_temp(2);
 323
 324 static ssize_t
 325 show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 326 {
 327         struct adm1025_data *data = adm1025_update_device(dev);
 328         return sprintf(buf, "%u\n", data->alarms);
 329 }
 330 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 331
 332 static ssize_t
 333 show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
 334 {
 335         int bitnr = to_sensor_dev_attr(attr)->index;
 336         struct adm1025_data *data = adm1025_update_device(dev);
 337         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 338 }
 339 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 340 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 341 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 342 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 343 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 344 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 345 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 5);
 346 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4);
 347 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);
 348
 349 static ssize_t
 350 show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 351 {
 352         struct adm1025_data *data = adm1025_update_device(dev);
 353         return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
 354 }
 355 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 356
 357 static ssize_t
 358 show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 359 {
 360         struct adm1025_data *data = dev_get_drvdata(dev);
 361         return sprintf(buf, "%u\n", data->vrm);
 362 }
 363 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 364                        const char *buf, size_t count)
 365 {
 366         struct adm1025_data *data = dev_get_drvdata(dev);
 367         unsigned long val;
 368         int err;
 369
 370         err = kstrtoul(buf, 10, &val);
 371         if (err)
 372                 return err;
 373
 374         data->vrm = val;
 375         return count;
 376 }
 377 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 378
 379 /*
 380  * Real code
 381  */
 382
 383 static struct attribute *adm1025_attributes[] = {
 384         &sensor_dev_attr_in0_input.dev_attr.attr,
 385         &sensor_dev_attr_in1_input.dev_attr.attr,
 386         &sensor_dev_attr_in2_input.dev_attr.attr,
 387         &sensor_dev_attr_in3_input.dev_attr.attr,
 388         &sensor_dev_attr_in5_input.dev_attr.attr,
 389         &sensor_dev_attr_in0_min.dev_attr.attr,
 390         &sensor_dev_attr_in1_min.dev_attr.attr,
 391         &sensor_dev_attr_in2_min.dev_attr.attr,
 392         &sensor_dev_attr_in3_min.dev_attr.attr,
 393         &sensor_dev_attr_in5_min.dev_attr.attr,
 394         &sensor_dev_attr_in0_max.dev_attr.attr,
 395         &sensor_dev_attr_in1_max.dev_attr.attr,
 396         &sensor_dev_attr_in2_max.dev_attr.attr,
 397         &sensor_dev_attr_in3_max.dev_attr.attr,
 398         &sensor_dev_attr_in5_max.dev_attr.attr,
 399         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 400         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 401         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 402         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 403         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 404         &sensor_dev_attr_temp1_input.dev_attr.attr,
 405         &sensor_dev_attr_temp2_input.dev_attr.attr,
 406         &sensor_dev_attr_temp1_min.dev_attr.attr,
 407         &sensor_dev_attr_temp2_min.dev_attr.attr,
 408         &sensor_dev_attr_temp1_max.dev_attr.attr,
 409         &sensor_dev_attr_temp2_max.dev_attr.attr,
 410         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 411         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 412         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 413         &dev_attr_alarms.attr,
 414         &dev_attr_cpu0_vid.attr,
 415         &dev_attr_vrm.attr,
 416         NULL
 417 };
 418
 419 static const struct attribute_group adm1025_group = {
 420         .attrs = adm1025_attributes,
 421 };
 422
 423 static struct attribute *adm1025_attributes_in4[] = {
 424         &sensor_dev_attr_in4_input.dev_attr.attr,
 425         &sensor_dev_attr_in4_min.dev_attr.attr,
 426         &sensor_dev_attr_in4_max.dev_attr.attr,
 427         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 428         NULL
 429 };
 430
 431 static const struct attribute_group adm1025_group_in4 = {
 432         .attrs = adm1025_attributes_in4,
 433 };
 434
 435 /* Return 0 if detection is successful, -ENODEV otherwise */
 436 static int adm1025_detect(struct i2c_client *client,
 437                           struct i2c_board_info *info)
 438 {
 439         struct i2c_adapter *adapter = client->adapter;
 440         const char *name;
 441         u8 man_id, chip_id;
 442
 443         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 444                 return -ENODEV;
 445
 446         /* Check for unused bits */
 447         if ((i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG) & 0x80)
 448          || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS1) & 0xC0)
 449          || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS2) & 0xBC)) {
 450                 dev_dbg(&adapter->dev, "ADM1025 detection failed at 0x%02x\n",
 451                         client->addr);
 452                 return -ENODEV;
 453         }
 454
 455         /* Identification */
 456         chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);
 457         if ((chip_id & 0xF0) != 0x20)
 458                 return -ENODEV;
 459
 460         man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
 461         if (man_id == 0x41)
 462                 name = "adm1025";
 463         else if (man_id == 0xA1 && client->addr != 0x2E)
 464                 name = "ne1619";
 465         else
 466                 return -ENODEV;
 467
 468         strlcpy(info->type, name, I2C_NAME_SIZE);
 469
 470         return 0;
 471 }
 472
 473 static int adm1025_probe(struct i2c_client *client,
 474                          const struct i2c_device_id *id)
 475 {
 476         struct adm1025_data *data;
 477         int err;
 478         u8 config;
 479
 480         data = devm_kzalloc(&client->dev, sizeof(struct adm1025_data),
 481                             GFP_KERNEL);
 482         if (!data)
 483                 return -ENOMEM;
 484
 485         i2c_set_clientdata(client, data);
 486         mutex_init(&data->update_lock);
 487
 488         /* Initialize the ADM1025 chip */
 489         adm1025_init_client(client);
 490
 491         /* Register sysfs hooks */
 492         err = sysfs_create_group(&client->dev.kobj, &adm1025_group);
 493         if (err)
 494                 return err;
 495
 496         /* Pin 11 is either in4 (+12V) or VID4 */
 497         config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 498         if (!(config & 0x20)) {
 499                 err = sysfs_create_group(&client->dev.kobj, &adm1025_group_in4);
 500                 if (err)
 501                         goto exit_remove;
 502         }
 503
 504         data->hwmon_dev = hwmon_device_register(&client->dev);
 505         if (IS_ERR(data->hwmon_dev)) {
 506                 err = PTR_ERR(data->hwmon_dev);
 507                 goto exit_remove;
 508         }
 509
 510         return 0;
 511
 512 exit_remove:
 513         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 514         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 515         return err;
 516 }
 517
 518 static void adm1025_init_client(struct i2c_client *client)
 519 {
 520         u8 reg;
 521         struct adm1025_data *data = i2c_get_clientdata(client);
 522         int i;
 523
 524         data->vrm = vid_which_vrm();
 525
 526         /*
 527          * Set high limits
 528          * Usually we avoid setting limits on driver init, but it happens
 529          * that the ADM1025 comes with stupid default limits (all registers
 530          * set to 0). In case the chip has not gone through any limit
 531          * setting yet, we better set the high limits to the max so that
 532          * no alarm triggers.
 533          */
 534         for (i = 0; i < 6; i++) {
 535                 reg = i2c_smbus_read_byte_data(client,
 536                                                ADM1025_REG_IN_MAX(i));
 537                 if (reg == 0)
 538                         i2c_smbus_write_byte_data(client,
 539                                                   ADM1025_REG_IN_MAX(i),
 540                                                   0xFF);
 541         }
 542         for (i = 0; i < 2; i++) {
 543                 reg = i2c_smbus_read_byte_data(client,
 544                                                ADM1025_REG_TEMP_HIGH(i));
 545                 if (reg == 0)
 546                         i2c_smbus_write_byte_data(client,
 547                                                   ADM1025_REG_TEMP_HIGH(i),
 548                                                   0x7F);
 549         }
 550
 551         /*
 552          * Start the conversions
 553          */
 554         reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 555         if (!(reg & 0x01))
 556                 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
 557                                           (reg&0x7E)|0x01);
 558 }
 559
 560 static int adm1025_remove(struct i2c_client *client)
 561 {
 562         struct adm1025_data *data = i2c_get_clientdata(client);
 563
 564         hwmon_device_unregister(data->hwmon_dev);
 565         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 566         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 567
 568         return 0;
 569 }
 570
 571 static struct adm1025_data *adm1025_update_device(struct device *dev)
 572 {
 573         struct i2c_client *client = to_i2c_client(dev);
 574         struct adm1025_data *data = i2c_get_clientdata(client);
 575
 576         mutex_lock(&data->update_lock);
 577
 578         if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
 579                 int i;
 580
 581                 dev_dbg(&client->dev, "Updating data.\n");
 582                 for (i = 0; i < 6; i++) {
 583                         data->in[i] = i2c_smbus_read_byte_data(client,
 584                                       ADM1025_REG_IN(i));
 585                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 586                                           ADM1025_REG_IN_MIN(i));
 587                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 588                                           ADM1025_REG_IN_MAX(i));
 589                 }
 590                 for (i = 0; i < 2; i++) {
 591                         data->temp[i] = i2c_smbus_read_byte_data(client,
 592                                         ADM1025_REG_TEMP(i));
 593                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 594                                             ADM1025_REG_TEMP_LOW(i));
 595                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 596                                             ADM1025_REG_TEMP_HIGH(i));
 597                 }
 598                 data->alarms = i2c_smbus_read_byte_data(client,
 599                                ADM1025_REG_STATUS1)
 600                              | (i2c_smbus_read_byte_data(client,
 601                                 ADM1025_REG_STATUS2) << 8);
 602                 data->vid = (i2c_smbus_read_byte_data(client,
 603                              ADM1025_REG_VID) & 0x0f)
 604                           | ((i2c_smbus_read_byte_data(client,
 605                               ADM1025_REG_VID4) & 0x01) << 4);
 606
 607                 data->last_updated = jiffies;
 608                 data->valid = 1;
 609         }
 610
 611         mutex_unlock(&data->update_lock);
 612
 613         return data;
 614 }
 615
 616 module_i2c_driver(adm1025_driver);
 617
 618 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
 619 MODULE_DESCRIPTION("ADM1025 driver");
 620 MODULE_LICENSE("GPL");