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.analog.com/Analog_Root/productPage/productHome/0,2121,ADM1025,00.html
  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 : (val)+500) / 1000))
 103
 104 /*
 105  * Functions declaration
 106  */
 107
 108 static int adm1025_probe(struct i2c_client *client,
 109                          const struct i2c_device_id *id);
 110 static int adm1025_detect(struct i2c_client *client,
 111                           struct i2c_board_info *info);
 112 static void adm1025_init_client(struct i2c_client *client);
 113 static int adm1025_remove(struct i2c_client *client);
 114 static struct adm1025_data *adm1025_update_device(struct device *dev);
 115
 116 /*
 117  * Driver data (common to all clients)
 118  */
 119
 120 static const struct i2c_device_id adm1025_id[] = {
 121         { "adm1025", adm1025 },
 122         { "ne1619", ne1619 },
 123         { }
 124 };
 125 MODULE_DEVICE_TABLE(i2c, adm1025_id);
 126
 127 static struct i2c_driver adm1025_driver = {
 128         .class          = I2C_CLASS_HWMON,
 129         .driver = {
 130                 .name   = "adm1025",
 131         },
 132         .probe          = adm1025_probe,
 133         .remove         = adm1025_remove,
 134         .id_table       = adm1025_id,
 135         .detect         = adm1025_detect,
 136         .address_list   = normal_i2c,
 137 };
 138
 139 /*
 140  * Client data (each client gets its own)
 141  */
 142
 143 struct adm1025_data {
 144         struct device *hwmon_dev;
 145         struct mutex update_lock;
 146         char valid; /* zero until following fields are valid */
 147         unsigned long last_updated; /* in jiffies */
 148
 149         u8 in[6];               /* register value */
 150         u8 in_max[6];           /* register value */
 151         u8 in_min[6];           /* register value */
 152         s8 temp[2];             /* register value */
 153         s8 temp_min[2];         /* register value */
 154         s8 temp_max[2];         /* register value */
 155         u16 alarms;             /* register values, combined */
 156         u8 vid;                 /* register values, combined */
 157         u8 vrm;
 158 };
 159
 160 /*
 161  * Sysfs stuff
 162  */
 163
 164 static ssize_t
 165 show_in(struct device *dev, struct device_attribute *attr, char *buf)
 166 {
 167         int index = to_sensor_dev_attr(attr)->index;
 168         struct adm1025_data *data = adm1025_update_device(dev);
 169         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
 170                        in_scale[index]));
 171 }
 172
 173 static ssize_t
 174 show_in_min(struct device *dev, struct device_attribute *attr, char *buf)
 175 {
 176         int index = to_sensor_dev_attr(attr)->index;
 177         struct adm1025_data *data = adm1025_update_device(dev);
 178         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index],
 179                        in_scale[index]));
 180 }
 181
 182 static ssize_t
 183 show_in_max(struct device *dev, struct device_attribute *attr, char *buf)
 184 {
 185         int index = to_sensor_dev_attr(attr)->index;
 186         struct adm1025_data *data = adm1025_update_device(dev);
 187         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index],
 188                        in_scale[index]));
 189 }
 190
 191 static ssize_t
 192 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 193 {
 194         int index = to_sensor_dev_attr(attr)->index;
 195         struct adm1025_data *data = adm1025_update_device(dev);
 196         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
 197 }
 198
 199 static ssize_t
 200 show_temp_min(struct device *dev, struct device_attribute *attr, char *buf)
 201 {
 202         int index = to_sensor_dev_attr(attr)->index;
 203         struct adm1025_data *data = adm1025_update_device(dev);
 204         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[index]));
 205 }
 206
 207 static ssize_t
 208 show_temp_max(struct device *dev, struct device_attribute *attr, char *buf)
 209 {
 210         int index = to_sensor_dev_attr(attr)->index;
 211         struct adm1025_data *data = adm1025_update_device(dev);
 212         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
 213 }
 214
 215 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 216                           const char *buf, size_t count)
 217 {
 218         int index = to_sensor_dev_attr(attr)->index;
 219         struct i2c_client *client = to_i2c_client(dev);
 220         struct adm1025_data *data = i2c_get_clientdata(client);
 221         long val = simple_strtol(buf, NULL, 10);
 222
 223         mutex_lock(&data->update_lock);
 224         data->in_min[index] = IN_TO_REG(val, in_scale[index]);
 225         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
 226                                   data->in_min[index]);
 227         mutex_unlock(&data->update_lock);
 228         return count;
 229 }
 230
 231 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 232                           const char *buf, size_t count)
 233 {
 234         int index = to_sensor_dev_attr(attr)->index;
 235         struct i2c_client *client = to_i2c_client(dev);
 236         struct adm1025_data *data = i2c_get_clientdata(client);
 237         long val = simple_strtol(buf, NULL, 10);
 238
 239         mutex_lock(&data->update_lock);
 240         data->in_max[index] = IN_TO_REG(val, in_scale[index]);
 241         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
 242                                   data->in_max[index]);
 243         mutex_unlock(&data->update_lock);
 244         return count;
 245 }
 246
 247 #define set_in(offset) \
 248 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 249         show_in, NULL, offset); \
 250 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
 251         show_in_min, set_in_min, offset); \
 252 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
 253         show_in_max, set_in_max, offset)
 254 set_in(0);
 255 set_in(1);
 256 set_in(2);
 257 set_in(3);
 258 set_in(4);
 259 set_in(5);
 260
 261 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 262                             const char *buf, size_t count)
 263 {
 264         int index = to_sensor_dev_attr(attr)->index;
 265         struct i2c_client *client = to_i2c_client(dev);
 266         struct adm1025_data *data = i2c_get_clientdata(client);
 267         long val = simple_strtol(buf, NULL, 10);
 268
 269         mutex_lock(&data->update_lock);
 270         data->temp_min[index] = TEMP_TO_REG(val);
 271         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
 272                                   data->temp_min[index]);
 273         mutex_unlock(&data->update_lock);
 274         return count;
 275 }
 276
 277 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 278         const char *buf, size_t count)
 279 {
 280         int index = to_sensor_dev_attr(attr)->index;
 281         struct i2c_client *client = to_i2c_client(dev);
 282         struct adm1025_data *data = i2c_get_clientdata(client);
 283         long val = simple_strtol(buf, NULL, 10);
 284
 285         mutex_lock(&data->update_lock);
 286         data->temp_max[index] = TEMP_TO_REG(val);
 287         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
 288                                   data->temp_max[index]);
 289         mutex_unlock(&data->update_lock);
 290         return count;
 291 }
 292
 293 #define set_temp(offset) \
 294 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 295         show_temp, NULL, offset - 1); \
 296 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
 297         show_temp_min, set_temp_min, offset - 1); \
 298 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
 299         show_temp_max, set_temp_max, offset - 1)
 300 set_temp(1);
 301 set_temp(2);
 302
 303 static ssize_t
 304 show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 305 {
 306         struct adm1025_data *data = adm1025_update_device(dev);
 307         return sprintf(buf, "%u\n", data->alarms);
 308 }
 309 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 310
 311 static ssize_t
 312 show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
 313 {
 314         int bitnr = to_sensor_dev_attr(attr)->index;
 315         struct adm1025_data *data = adm1025_update_device(dev);
 316         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 317 }
 318 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 319 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 320 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 321 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 322 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 323 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 324 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 5);
 325 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4);
 326 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);
 327
 328 static ssize_t
 329 show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 330 {
 331         struct adm1025_data *data = adm1025_update_device(dev);
 332         return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
 333 }
 334 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 335
 336 static ssize_t
 337 show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 338 {
 339         struct adm1025_data *data = dev_get_drvdata(dev);
 340         return sprintf(buf, "%u\n", data->vrm);
 341 }
 342 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 343                        const char *buf, size_t count)
 344 {
 345         struct adm1025_data *data = dev_get_drvdata(dev);
 346         data->vrm = simple_strtoul(buf, NULL, 10);
 347         return count;
 348 }
 349 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 350
 351 /*
 352  * Real code
 353  */
 354
 355 static struct attribute *adm1025_attributes[] = {
 356         &sensor_dev_attr_in0_input.dev_attr.attr,
 357         &sensor_dev_attr_in1_input.dev_attr.attr,
 358         &sensor_dev_attr_in2_input.dev_attr.attr,
 359         &sensor_dev_attr_in3_input.dev_attr.attr,
 360         &sensor_dev_attr_in5_input.dev_attr.attr,
 361         &sensor_dev_attr_in0_min.dev_attr.attr,
 362         &sensor_dev_attr_in1_min.dev_attr.attr,
 363         &sensor_dev_attr_in2_min.dev_attr.attr,
 364         &sensor_dev_attr_in3_min.dev_attr.attr,
 365         &sensor_dev_attr_in5_min.dev_attr.attr,
 366         &sensor_dev_attr_in0_max.dev_attr.attr,
 367         &sensor_dev_attr_in1_max.dev_attr.attr,
 368         &sensor_dev_attr_in2_max.dev_attr.attr,
 369         &sensor_dev_attr_in3_max.dev_attr.attr,
 370         &sensor_dev_attr_in5_max.dev_attr.attr,
 371         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 372         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 373         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 374         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 375         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 376         &sensor_dev_attr_temp1_input.dev_attr.attr,
 377         &sensor_dev_attr_temp2_input.dev_attr.attr,
 378         &sensor_dev_attr_temp1_min.dev_attr.attr,
 379         &sensor_dev_attr_temp2_min.dev_attr.attr,
 380         &sensor_dev_attr_temp1_max.dev_attr.attr,
 381         &sensor_dev_attr_temp2_max.dev_attr.attr,
 382         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 383         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 384         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 385         &dev_attr_alarms.attr,
 386         &dev_attr_cpu0_vid.attr,
 387         &dev_attr_vrm.attr,
 388         NULL
 389 };
 390
 391 static const struct attribute_group adm1025_group = {
 392         .attrs = adm1025_attributes,
 393 };
 394
 395 static struct attribute *adm1025_attributes_in4[] = {
 396         &sensor_dev_attr_in4_input.dev_attr.attr,
 397         &sensor_dev_attr_in4_min.dev_attr.attr,
 398         &sensor_dev_attr_in4_max.dev_attr.attr,
 399         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 400         NULL
 401 };
 402
 403 static const struct attribute_group adm1025_group_in4 = {
 404         .attrs = adm1025_attributes_in4,
 405 };
 406
 407 /* Return 0 if detection is successful, -ENODEV otherwise */
 408 static int adm1025_detect(struct i2c_client *client,
 409                           struct i2c_board_info *info)
 410 {
 411         struct i2c_adapter *adapter = client->adapter;
 412         const char *name;
 413         u8 man_id, chip_id;
 414
 415         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 416                 return -ENODEV;
 417
 418         /* Check for unused bits */
 419         if ((i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG) & 0x80)
 420          || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS1) & 0xC0)
 421          || (i2c_smbus_read_byte_data(client, ADM1025_REG_STATUS2) & 0xBC)) {
 422                 dev_dbg(&adapter->dev, "ADM1025 detection failed at 0x%02x\n",
 423                         client->addr);
 424                 return -ENODEV;
 425         }
 426
 427         /* Identification */
 428         chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);
 429         if ((chip_id & 0xF0) != 0x20)
 430                 return -ENODEV;
 431
 432         man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
 433         if (man_id == 0x41)
 434                 name = "adm1025";
 435         else if (man_id == 0xA1 && client->addr != 0x2E)
 436                 name = "ne1619";
 437         else
 438                 return -ENODEV;
 439
 440         strlcpy(info->type, name, I2C_NAME_SIZE);
 441
 442         return 0;
 443 }
 444
 445 static int adm1025_probe(struct i2c_client *client,
 446                          const struct i2c_device_id *id)
 447 {
 448         struct adm1025_data *data;
 449         int err;
 450         u8 config;
 451
 452         data = kzalloc(sizeof(struct adm1025_data), GFP_KERNEL);
 453         if (!data) {
 454                 err = -ENOMEM;
 455                 goto exit;
 456         }
 457
 458         i2c_set_clientdata(client, data);
 459         mutex_init(&data->update_lock);
 460
 461         /* Initialize the ADM1025 chip */
 462         adm1025_init_client(client);
 463
 464         /* Register sysfs hooks */
 465         if ((err = sysfs_create_group(&client->dev.kobj, &adm1025_group)))
 466                 goto exit_free;
 467
 468         /* Pin 11 is either in4 (+12V) or VID4 */
 469         config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 470         if (!(config & 0x20)) {
 471                 if ((err = sysfs_create_group(&client->dev.kobj,
 472                                               &adm1025_group_in4)))
 473                         goto exit_remove;
 474         }
 475
 476         data->hwmon_dev = hwmon_device_register(&client->dev);
 477         if (IS_ERR(data->hwmon_dev)) {
 478                 err = PTR_ERR(data->hwmon_dev);
 479                 goto exit_remove;
 480         }
 481
 482         return 0;
 483
 484 exit_remove:
 485         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 486         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 487 exit_free:
 488         kfree(data);
 489 exit:
 490         return err;
 491 }
 492
 493 static void adm1025_init_client(struct i2c_client *client)
 494 {
 495         u8 reg;
 496         struct adm1025_data *data = i2c_get_clientdata(client);
 497         int i;
 498
 499         data->vrm = vid_which_vrm();
 500
 501         /*
 502          * Set high limits
 503          * Usually we avoid setting limits on driver init, but it happens
 504          * that the ADM1025 comes with stupid default limits (all registers
 505          * set to 0). In case the chip has not gone through any limit
 506          * setting yet, we better set the high limits to the max so that
 507          * no alarm triggers.
 508          */
 509         for (i=0; i<6; i++) {
 510                 reg = i2c_smbus_read_byte_data(client,
 511                                                ADM1025_REG_IN_MAX(i));
 512                 if (reg == 0)
 513                         i2c_smbus_write_byte_data(client,
 514                                                   ADM1025_REG_IN_MAX(i),
 515                                                   0xFF);
 516         }
 517         for (i=0; i<2; i++) {
 518                 reg = i2c_smbus_read_byte_data(client,
 519                                                ADM1025_REG_TEMP_HIGH(i));
 520                 if (reg == 0)
 521                         i2c_smbus_write_byte_data(client,
 522                                                   ADM1025_REG_TEMP_HIGH(i),
 523                                                   0x7F);
 524         }
 525
 526         /*
 527          * Start the conversions
 528          */
 529         reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 530         if (!(reg & 0x01))
 531                 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
 532                                           (reg&0x7E)|0x01);
 533 }
 534
 535 static int adm1025_remove(struct i2c_client *client)
 536 {
 537         struct adm1025_data *data = i2c_get_clientdata(client);
 538
 539         hwmon_device_unregister(data->hwmon_dev);
 540         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 541         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 542
 543         kfree(data);
 544         return 0;
 545 }
 546
 547 static struct adm1025_data *adm1025_update_device(struct device *dev)
 548 {
 549         struct i2c_client *client = to_i2c_client(dev);
 550         struct adm1025_data *data = i2c_get_clientdata(client);
 551
 552         mutex_lock(&data->update_lock);
 553
 554         if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
 555                 int i;
 556
 557                 dev_dbg(&client->dev, "Updating data.\n");
 558                 for (i=0; i<6; i++) {
 559                         data->in[i] = i2c_smbus_read_byte_data(client,
 560                                       ADM1025_REG_IN(i));
 561                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 562                                           ADM1025_REG_IN_MIN(i));
 563                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 564                                           ADM1025_REG_IN_MAX(i));
 565                 }
 566                 for (i=0; i<2; i++) {
 567                         data->temp[i] = i2c_smbus_read_byte_data(client,
 568                                         ADM1025_REG_TEMP(i));
 569                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 570                                             ADM1025_REG_TEMP_LOW(i));
 571                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 572                                             ADM1025_REG_TEMP_HIGH(i));
 573                 }
 574                 data->alarms = i2c_smbus_read_byte_data(client,
 575                                ADM1025_REG_STATUS1)
 576                              | (i2c_smbus_read_byte_data(client,
 577                                 ADM1025_REG_STATUS2) << 8);
 578                 data->vid = (i2c_smbus_read_byte_data(client,
 579                              ADM1025_REG_VID) & 0x0f)
 580                           | ((i2c_smbus_read_byte_data(client,
 581                               ADM1025_REG_VID4) & 0x01) << 4);
 582
 583                 data->last_updated = jiffies;
 584                 data->valid = 1;
 585         }
 586
 587         mutex_unlock(&data->update_lock);
 588
 589         return data;
 590 }
 591
 592 static int __init sensors_adm1025_init(void)
 593 {
 594         return i2c_add_driver(&adm1025_driver);
 595 }
 596
 597 static void __exit sensors_adm1025_exit(void)
 598 {
 599         i2c_del_driver(&adm1025_driver);
 600 }
 601
 602 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
 603 MODULE_DESCRIPTION("ADM1025 driver");
 604 MODULE_LICENSE("GPL");
 605
 606 module_init(sensors_adm1025_init);
 607 module_exit(sensors_adm1025_exit);