drivers/hwmon/adm1025.c

   1 /*
   2  * adm1025.c
   3  *
   4  * Copyright (C) 2000       Chen-Yuan Wu <gwu@esoft.com>
   5  * Copyright (C) 2003-2004  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 unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  66
  67 /*
  68  * Insmod parameters
  69  */
  70
  71 I2C_CLIENT_INSMOD_2(adm1025, ne1619);
  72
  73 /*
  74  * The ADM1025 registers
  75  */
  76
  77 #define ADM1025_REG_MAN_ID              0x3E
  78 #define ADM1025_REG_CHIP_ID             0x3F
  79 #define ADM1025_REG_CONFIG              0x40
  80 #define ADM1025_REG_STATUS1             0x41
  81 #define ADM1025_REG_STATUS2             0x42
  82 #define ADM1025_REG_IN(nr)              (0x20 + (nr))
  83 #define ADM1025_REG_IN_MAX(nr)          (0x2B + (nr) * 2)
  84 #define ADM1025_REG_IN_MIN(nr)          (0x2C + (nr) * 2)
  85 #define ADM1025_REG_TEMP(nr)            (0x26 + (nr))
  86 #define ADM1025_REG_TEMP_HIGH(nr)       (0x37 + (nr) * 2)
  87 #define ADM1025_REG_TEMP_LOW(nr)        (0x38 + (nr) * 2)
  88 #define ADM1025_REG_VID                 0x47
  89 #define ADM1025_REG_VID4                0x49
  90
  91 /*
  92  * Conversions and various macros
  93  * The ADM1025 uses signed 8-bit values for temperatures.
  94  */
  95
  96 static const int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
  97
  98 #define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
  99 #define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
 100                                  (val) * 192 >= (scale) * 255 ? 255 : \
 101                                  ((val) * 192 + (scale)/2) / (scale))
 102
 103 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 104 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 105                                  (val) >= 126500 ? 127 : \
 106                                  (((val) < 0 ? (val)-500 : (val)+500) / 1000))
 107
 108 /*
 109  * Functions declaration
 110  */
 111
 112 static int adm1025_attach_adapter(struct i2c_adapter *adapter);
 113 static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind);
 114 static void adm1025_init_client(struct i2c_client *client);
 115 static int adm1025_detach_client(struct i2c_client *client);
 116 static struct adm1025_data *adm1025_update_device(struct device *dev);
 117
 118 /*
 119  * Driver data (common to all clients)
 120  */
 121
 122 static struct i2c_driver adm1025_driver = {
 123         .driver = {
 124                 .name   = "adm1025",
 125         },
 126         .attach_adapter = adm1025_attach_adapter,
 127         .detach_client  = adm1025_detach_client,
 128 };
 129
 130 /*
 131  * Client data (each client gets its own)
 132  */
 133
 134 struct adm1025_data {
 135         struct i2c_client client;
 136         struct device *hwmon_dev;
 137         struct mutex update_lock;
 138         char valid; /* zero until following fields are valid */
 139         unsigned long last_updated; /* in jiffies */
 140
 141         u8 in[6];               /* register value */
 142         u8 in_max[6];           /* register value */
 143         u8 in_min[6];           /* register value */
 144         s8 temp[2];             /* register value */
 145         s8 temp_min[2];         /* register value */
 146         s8 temp_max[2];         /* register value */
 147         u16 alarms;             /* register values, combined */
 148         u8 vid;                 /* register values, combined */
 149         u8 vrm;
 150 };
 151
 152 /*
 153  * Sysfs stuff
 154  */
 155
 156 static ssize_t
 157 show_in(struct device *dev, struct device_attribute *attr, char *buf)
 158 {
 159         int index = to_sensor_dev_attr(attr)->index;
 160         struct adm1025_data *data = adm1025_update_device(dev);
 161         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
 162                        in_scale[index]));
 163 }
 164
 165 static ssize_t
 166 show_in_min(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_min[index],
 171                        in_scale[index]));
 172 }
 173
 174 static ssize_t
 175 show_in_max(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_max[index],
 180                        in_scale[index]));
 181 }
 182
 183 static ssize_t
 184 show_temp(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, "%d\n", TEMP_FROM_REG(data->temp[index]));
 189 }
 190
 191 static ssize_t
 192 show_temp_min(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_min[index]));
 197 }
 198
 199 static ssize_t
 200 show_temp_max(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_max[index]));
 205 }
 206
 207 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 208                           const char *buf, size_t count)
 209 {
 210         int index = to_sensor_dev_attr(attr)->index;
 211         struct i2c_client *client = to_i2c_client(dev);
 212         struct adm1025_data *data = i2c_get_clientdata(client);
 213         long val = simple_strtol(buf, NULL, 10);
 214
 215         mutex_lock(&data->update_lock);
 216         data->in_min[index] = IN_TO_REG(val, in_scale[index]);
 217         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
 218                                   data->in_min[index]);
 219         mutex_unlock(&data->update_lock);
 220         return count;
 221 }
 222
 223 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 224                           const char *buf, size_t count)
 225 {
 226         int index = to_sensor_dev_attr(attr)->index;
 227         struct i2c_client *client = to_i2c_client(dev);
 228         struct adm1025_data *data = i2c_get_clientdata(client);
 229         long val = simple_strtol(buf, NULL, 10);
 230
 231         mutex_lock(&data->update_lock);
 232         data->in_max[index] = IN_TO_REG(val, in_scale[index]);
 233         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
 234                                   data->in_max[index]);
 235         mutex_unlock(&data->update_lock);
 236         return count;
 237 }
 238
 239 #define set_in(offset) \
 240 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 241         show_in, NULL, offset); \
 242 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
 243         show_in_min, set_in_min, offset); \
 244 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
 245         show_in_max, set_in_max, offset)
 246 set_in(0);
 247 set_in(1);
 248 set_in(2);
 249 set_in(3);
 250 set_in(4);
 251 set_in(5);
 252
 253 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 254                             const char *buf, size_t count)
 255 {
 256         int index = to_sensor_dev_attr(attr)->index;
 257         struct i2c_client *client = to_i2c_client(dev);
 258         struct adm1025_data *data = i2c_get_clientdata(client);
 259         long val = simple_strtol(buf, NULL, 10);
 260
 261         mutex_lock(&data->update_lock);
 262         data->temp_min[index] = TEMP_TO_REG(val);
 263         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
 264                                   data->temp_min[index]);
 265         mutex_unlock(&data->update_lock);
 266         return count;
 267 }
 268
 269 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 270         const char *buf, size_t count)
 271 {
 272         int index = to_sensor_dev_attr(attr)->index;
 273         struct i2c_client *client = to_i2c_client(dev);
 274         struct adm1025_data *data = i2c_get_clientdata(client);
 275         long val = simple_strtol(buf, NULL, 10);
 276
 277         mutex_lock(&data->update_lock);
 278         data->temp_max[index] = TEMP_TO_REG(val);
 279         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
 280                                   data->temp_max[index]);
 281         mutex_unlock(&data->update_lock);
 282         return count;
 283 }
 284
 285 #define set_temp(offset) \
 286 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 287         show_temp, NULL, offset - 1); \
 288 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
 289         show_temp_min, set_temp_min, offset - 1); \
 290 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
 291         show_temp_max, set_temp_max, offset - 1)
 292 set_temp(1);
 293 set_temp(2);
 294
 295 static ssize_t
 296 show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 297 {
 298         struct adm1025_data *data = adm1025_update_device(dev);
 299         return sprintf(buf, "%u\n", data->alarms);
 300 }
 301 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 302
 303 static ssize_t
 304 show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
 305 {
 306         int bitnr = to_sensor_dev_attr(attr)->index;
 307         struct adm1025_data *data = adm1025_update_device(dev);
 308         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 309 }
 310 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 311 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 312 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 313 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 314 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 315 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 316 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 5);
 317 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4);
 318 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);
 319
 320 static ssize_t
 321 show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 322 {
 323         struct adm1025_data *data = adm1025_update_device(dev);
 324         return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
 325 }
 326 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 327
 328 static ssize_t
 329 show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 330 {
 331         struct adm1025_data *data = dev_get_drvdata(dev);
 332         return sprintf(buf, "%u\n", data->vrm);
 333 }
 334 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 335                        const char *buf, size_t count)
 336 {
 337         struct adm1025_data *data = dev_get_drvdata(dev);
 338         data->vrm = simple_strtoul(buf, NULL, 10);
 339         return count;
 340 }
 341 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 342
 343 /*
 344  * Real code
 345  */
 346
 347 static int adm1025_attach_adapter(struct i2c_adapter *adapter)
 348 {
 349         if (!(adapter->class & I2C_CLASS_HWMON))
 350                 return 0;
 351         return i2c_probe(adapter, &addr_data, adm1025_detect);
 352 }
 353
 354 static struct attribute *adm1025_attributes[] = {
 355         &sensor_dev_attr_in0_input.dev_attr.attr,
 356         &sensor_dev_attr_in1_input.dev_attr.attr,
 357         &sensor_dev_attr_in2_input.dev_attr.attr,
 358         &sensor_dev_attr_in3_input.dev_attr.attr,
 359         &sensor_dev_attr_in5_input.dev_attr.attr,
 360         &sensor_dev_attr_in0_min.dev_attr.attr,
 361         &sensor_dev_attr_in1_min.dev_attr.attr,
 362         &sensor_dev_attr_in2_min.dev_attr.attr,
 363         &sensor_dev_attr_in3_min.dev_attr.attr,
 364         &sensor_dev_attr_in5_min.dev_attr.attr,
 365         &sensor_dev_attr_in0_max.dev_attr.attr,
 366         &sensor_dev_attr_in1_max.dev_attr.attr,
 367         &sensor_dev_attr_in2_max.dev_attr.attr,
 368         &sensor_dev_attr_in3_max.dev_attr.attr,
 369         &sensor_dev_attr_in5_max.dev_attr.attr,
 370         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 371         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 372         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 373         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 374         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 375         &sensor_dev_attr_temp1_input.dev_attr.attr,
 376         &sensor_dev_attr_temp2_input.dev_attr.attr,
 377         &sensor_dev_attr_temp1_min.dev_attr.attr,
 378         &sensor_dev_attr_temp2_min.dev_attr.attr,
 379         &sensor_dev_attr_temp1_max.dev_attr.attr,
 380         &sensor_dev_attr_temp2_max.dev_attr.attr,
 381         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 382         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 383         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 384         &dev_attr_alarms.attr,
 385         &dev_attr_cpu0_vid.attr,
 386         &dev_attr_vrm.attr,
 387         NULL
 388 };
 389
 390 static const struct attribute_group adm1025_group = {
 391         .attrs = adm1025_attributes,
 392 };
 393
 394 static struct attribute *adm1025_attributes_in4[] = {
 395         &sensor_dev_attr_in4_input.dev_attr.attr,
 396         &sensor_dev_attr_in4_min.dev_attr.attr,
 397         &sensor_dev_attr_in4_max.dev_attr.attr,
 398         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 399         NULL
 400 };
 401
 402 static const struct attribute_group adm1025_group_in4 = {
 403         .attrs = adm1025_attributes_in4,
 404 };
 405
 406 /*
 407  * The following function does more than just detection. If detection
 408  * succeeds, it also registers the new chip.
 409  */
 410 static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind)
 411 {
 412         struct i2c_client *client;
 413         struct adm1025_data *data;
 414         int err = 0;
 415         const char *name = "";
 416         u8 config;
 417
 418         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 419                 goto exit;
 420
 421         if (!(data = kzalloc(sizeof(struct adm1025_data), GFP_KERNEL))) {
 422                 err = -ENOMEM;
 423                 goto exit;
 424         }
 425
 426         client = &data->client;
 427         i2c_set_clientdata(client, data);
 428         client->addr = address;
 429         client->adapter = adapter;
 430         client->driver = &adm1025_driver;
 431
 432         /*
 433          * Now we do the remaining detection. A negative kind means that
 434          * the driver was loaded with no force parameter (default), so we
 435          * must both detect and identify the chip. A zero kind means that
 436          * the driver was loaded with the force parameter, the detection
 437          * step shall be skipped. A positive kind means that the driver
 438          * was loaded with the force parameter and a given kind of chip is
 439          * requested, so both the detection and the identification steps
 440          * are skipped.
 441          */
 442         config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 443         if (kind < 0) { /* detection */
 444                 if ((config & 0x80) != 0x00
 445                  || (i2c_smbus_read_byte_data(client,
 446                      ADM1025_REG_STATUS1) & 0xC0) != 0x00
 447                  || (i2c_smbus_read_byte_data(client,
 448                      ADM1025_REG_STATUS2) & 0xBC) != 0x00) {
 449                         dev_dbg(&adapter->dev,
 450                                 "ADM1025 detection failed at 0x%02x.\n",
 451                                 address);
 452                         goto exit_free;
 453                 }
 454         }
 455
 456         if (kind <= 0) { /* identification */
 457                 u8 man_id, chip_id;
 458
 459                 man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
 460                 chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);
 461
 462                 if (man_id == 0x41) { /* Analog Devices */
 463                         if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */
 464                                 kind = adm1025;
 465                         }
 466                 } else
 467                 if (man_id == 0xA1) { /* Philips */
 468                         if (address != 0x2E
 469                          && (chip_id & 0xF0) == 0x20) { /* NE1619 */
 470                                 kind = ne1619;
 471                         }
 472                 }
 473
 474                 if (kind <= 0) { /* identification failed */
 475                         dev_info(&adapter->dev,
 476                             "Unsupported chip (man_id=0x%02X, "
 477                             "chip_id=0x%02X).\n", man_id, chip_id);
 478                         goto exit_free;
 479                 }
 480         }
 481
 482         if (kind == adm1025) {
 483                 name = "adm1025";
 484         } else if (kind == ne1619) {
 485                 name = "ne1619";
 486         }
 487
 488         /* We can fill in the remaining client fields */
 489         strlcpy(client->name, name, I2C_NAME_SIZE);
 490         mutex_init(&data->update_lock);
 491
 492         /* Tell the I2C layer a new client has arrived */
 493         if ((err = i2c_attach_client(client)))
 494                 goto exit_free;
 495
 496         /* Initialize the ADM1025 chip */
 497         adm1025_init_client(client);
 498
 499         /* Register sysfs hooks */
 500         if ((err = sysfs_create_group(&client->dev.kobj, &adm1025_group)))
 501                 goto exit_detach;
 502
 503         /* Pin 11 is either in4 (+12V) or VID4 */
 504         if (!(config & 0x20)) {
 505                 if ((err = sysfs_create_group(&client->dev.kobj,
 506                                               &adm1025_group_in4)))
 507                         goto exit_remove;
 508         }
 509
 510         data->hwmon_dev = hwmon_device_register(&client->dev);
 511         if (IS_ERR(data->hwmon_dev)) {
 512                 err = PTR_ERR(data->hwmon_dev);
 513                 goto exit_remove;
 514         }
 515
 516         return 0;
 517
 518 exit_remove:
 519         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 520         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 521 exit_detach:
 522         i2c_detach_client(client);
 523 exit_free:
 524         kfree(data);
 525 exit:
 526         return err;
 527 }
 528
 529 static void adm1025_init_client(struct i2c_client *client)
 530 {
 531         u8 reg;
 532         struct adm1025_data *data = i2c_get_clientdata(client);
 533         int i;
 534
 535         data->vrm = vid_which_vrm();
 536
 537         /*
 538          * Set high limits
 539          * Usually we avoid setting limits on driver init, but it happens
 540          * that the ADM1025 comes with stupid default limits (all registers
 541          * set to 0). In case the chip has not gone through any limit
 542          * setting yet, we better set the high limits to the max so that
 543          * no alarm triggers.
 544          */
 545         for (i=0; i<6; i++) {
 546                 reg = i2c_smbus_read_byte_data(client,
 547                                                ADM1025_REG_IN_MAX(i));
 548                 if (reg == 0)
 549                         i2c_smbus_write_byte_data(client,
 550                                                   ADM1025_REG_IN_MAX(i),
 551                                                   0xFF);
 552         }
 553         for (i=0; i<2; i++) {
 554                 reg = i2c_smbus_read_byte_data(client,
 555                                                ADM1025_REG_TEMP_HIGH(i));
 556                 if (reg == 0)
 557                         i2c_smbus_write_byte_data(client,
 558                                                   ADM1025_REG_TEMP_HIGH(i),
 559                                                   0x7F);
 560         }
 561
 562         /*
 563          * Start the conversions
 564          */
 565         reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 566         if (!(reg & 0x01))
 567                 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
 568                                           (reg&0x7E)|0x01);
 569 }
 570
 571 static int adm1025_detach_client(struct i2c_client *client)
 572 {
 573         struct adm1025_data *data = i2c_get_clientdata(client);
 574         int err;
 575
 576         hwmon_device_unregister(data->hwmon_dev);
 577         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 578         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 579
 580         if ((err = i2c_detach_client(client)))
 581                 return err;
 582
 583         kfree(data);
 584         return 0;
 585 }
 586
 587 static struct adm1025_data *adm1025_update_device(struct device *dev)
 588 {
 589         struct i2c_client *client = to_i2c_client(dev);
 590         struct adm1025_data *data = i2c_get_clientdata(client);
 591
 592         mutex_lock(&data->update_lock);
 593
 594         if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
 595                 int i;
 596
 597                 dev_dbg(&client->dev, "Updating data.\n");
 598                 for (i=0; i<6; i++) {
 599                         data->in[i] = i2c_smbus_read_byte_data(client,
 600                                       ADM1025_REG_IN(i));
 601                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 602                                           ADM1025_REG_IN_MIN(i));
 603                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 604                                           ADM1025_REG_IN_MAX(i));
 605                 }
 606                 for (i=0; i<2; i++) {
 607                         data->temp[i] = i2c_smbus_read_byte_data(client,
 608                                         ADM1025_REG_TEMP(i));
 609                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 610                                             ADM1025_REG_TEMP_LOW(i));
 611                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 612                                             ADM1025_REG_TEMP_HIGH(i));
 613                 }
 614                 data->alarms = i2c_smbus_read_byte_data(client,
 615                                ADM1025_REG_STATUS1)
 616                              | (i2c_smbus_read_byte_data(client,
 617                                 ADM1025_REG_STATUS2) << 8);
 618                 data->vid = (i2c_smbus_read_byte_data(client,
 619                              ADM1025_REG_VID) & 0x0f)
 620                           | ((i2c_smbus_read_byte_data(client,
 621                               ADM1025_REG_VID4) & 0x01) << 4);
 622
 623                 data->last_updated = jiffies;
 624                 data->valid = 1;
 625         }
 626
 627         mutex_unlock(&data->update_lock);
 628
 629         return data;
 630 }
 631
 632 static int __init sensors_adm1025_init(void)
 633 {
 634         return i2c_add_driver(&adm1025_driver);
 635 }
 636
 637 static void __exit sensors_adm1025_exit(void)
 638 {
 639         i2c_del_driver(&adm1025_driver);
 640 }
 641
 642 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
 643 MODULE_DESCRIPTION("ADM1025 driver");
 644 MODULE_LICENSE("GPL");
 645
 646 module_init(sensors_adm1025_init);
 647 module_exit(sensors_adm1025_exit);