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         .id             = I2C_DRIVERID_ADM1025,
 127         .attach_adapter = adm1025_attach_adapter,
 128         .detach_client  = adm1025_detach_client,
 129 };
 130
 131 /*
 132  * Client data (each client gets its own)
 133  */
 134
 135 struct adm1025_data {
 136         struct i2c_client client;
 137         struct device *hwmon_dev;
 138         struct mutex update_lock;
 139         char valid; /* zero until following fields are valid */
 140         unsigned long last_updated; /* in jiffies */
 141
 142         u8 in[6];               /* register value */
 143         u8 in_max[6];           /* register value */
 144         u8 in_min[6];           /* register value */
 145         s8 temp[2];             /* register value */
 146         s8 temp_min[2];         /* register value */
 147         s8 temp_max[2];         /* register value */
 148         u16 alarms;             /* register values, combined */
 149         u8 vid;                 /* register values, combined */
 150         u8 vrm;
 151 };
 152
 153 /*
 154  * Sysfs stuff
 155  */
 156
 157 static ssize_t
 158 show_in(struct device *dev, struct device_attribute *attr, char *buf)
 159 {
 160         int index = to_sensor_dev_attr(attr)->index;
 161         struct adm1025_data *data = adm1025_update_device(dev);
 162         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
 163                        in_scale[index]));
 164 }
 165
 166 static ssize_t
 167 show_in_min(struct device *dev, struct device_attribute *attr, char *buf)
 168 {
 169         int index = to_sensor_dev_attr(attr)->index;
 170         struct adm1025_data *data = adm1025_update_device(dev);
 171         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index],
 172                        in_scale[index]));
 173 }
 174
 175 static ssize_t
 176 show_in_max(struct device *dev, struct device_attribute *attr, char *buf)
 177 {
 178         int index = to_sensor_dev_attr(attr)->index;
 179         struct adm1025_data *data = adm1025_update_device(dev);
 180         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index],
 181                        in_scale[index]));
 182 }
 183
 184 static ssize_t
 185 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 186 {
 187         int index = to_sensor_dev_attr(attr)->index;
 188         struct adm1025_data *data = adm1025_update_device(dev);
 189         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
 190 }
 191
 192 static ssize_t
 193 show_temp_min(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_min[index]));
 198 }
 199
 200 static ssize_t
 201 show_temp_max(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_max[index]));
 206 }
 207
 208 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 209                           const char *buf, size_t count)
 210 {
 211         int index = to_sensor_dev_attr(attr)->index;
 212         struct i2c_client *client = to_i2c_client(dev);
 213         struct adm1025_data *data = i2c_get_clientdata(client);
 214         long val = simple_strtol(buf, NULL, 10);
 215
 216         mutex_lock(&data->update_lock);
 217         data->in_min[index] = IN_TO_REG(val, in_scale[index]);
 218         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
 219                                   data->in_min[index]);
 220         mutex_unlock(&data->update_lock);
 221         return count;
 222 }
 223
 224 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 225                           const char *buf, size_t count)
 226 {
 227         int index = to_sensor_dev_attr(attr)->index;
 228         struct i2c_client *client = to_i2c_client(dev);
 229         struct adm1025_data *data = i2c_get_clientdata(client);
 230         long val = simple_strtol(buf, NULL, 10);
 231
 232         mutex_lock(&data->update_lock);
 233         data->in_max[index] = IN_TO_REG(val, in_scale[index]);
 234         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
 235                                   data->in_max[index]);
 236         mutex_unlock(&data->update_lock);
 237         return count;
 238 }
 239
 240 #define set_in(offset) \
 241 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 242         show_in, NULL, offset); \
 243 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
 244         show_in_min, set_in_min, offset); \
 245 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
 246         show_in_max, set_in_max, offset)
 247 set_in(0);
 248 set_in(1);
 249 set_in(2);
 250 set_in(3);
 251 set_in(4);
 252 set_in(5);
 253
 254 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 255                             const char *buf, size_t count)
 256 {
 257         int index = to_sensor_dev_attr(attr)->index;
 258         struct i2c_client *client = to_i2c_client(dev);
 259         struct adm1025_data *data = i2c_get_clientdata(client);
 260         long val = simple_strtol(buf, NULL, 10);
 261
 262         mutex_lock(&data->update_lock);
 263         data->temp_min[index] = TEMP_TO_REG(val);
 264         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
 265                                   data->temp_min[index]);
 266         mutex_unlock(&data->update_lock);
 267         return count;
 268 }
 269
 270 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 271         const char *buf, size_t count)
 272 {
 273         int index = to_sensor_dev_attr(attr)->index;
 274         struct i2c_client *client = to_i2c_client(dev);
 275         struct adm1025_data *data = i2c_get_clientdata(client);
 276         long val = simple_strtol(buf, NULL, 10);
 277
 278         mutex_lock(&data->update_lock);
 279         data->temp_max[index] = TEMP_TO_REG(val);
 280         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
 281                                   data->temp_max[index]);
 282         mutex_unlock(&data->update_lock);
 283         return count;
 284 }
 285
 286 #define set_temp(offset) \
 287 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 288         show_temp, NULL, offset - 1); \
 289 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
 290         show_temp_min, set_temp_min, offset - 1); \
 291 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
 292         show_temp_max, set_temp_max, offset - 1)
 293 set_temp(1);
 294 set_temp(2);
 295
 296 static ssize_t
 297 show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 298 {
 299         struct adm1025_data *data = adm1025_update_device(dev);
 300         return sprintf(buf, "%u\n", data->alarms);
 301 }
 302 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 303
 304 static ssize_t
 305 show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
 306 {
 307         int bitnr = to_sensor_dev_attr(attr)->index;
 308         struct adm1025_data *data = adm1025_update_device(dev);
 309         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 310 }
 311 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 312 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 313 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 314 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 315 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 316 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 317 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 5);
 318 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4);
 319 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);
 320
 321 static ssize_t
 322 show_vid(struct device *dev, struct device_attribute *attr, char *buf)
 323 {
 324         struct adm1025_data *data = adm1025_update_device(dev);
 325         return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
 326 }
 327 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 328
 329 static ssize_t
 330 show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 331 {
 332         struct adm1025_data *data = dev_get_drvdata(dev);
 333         return sprintf(buf, "%u\n", data->vrm);
 334 }
 335 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 336                        const char *buf, size_t count)
 337 {
 338         struct i2c_client *client = to_i2c_client(dev);
 339         struct adm1025_data *data = i2c_get_clientdata(client);
 340         data->vrm = simple_strtoul(buf, NULL, 10);
 341         return count;
 342 }
 343 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 344
 345 /*
 346  * Real code
 347  */
 348
 349 static int adm1025_attach_adapter(struct i2c_adapter *adapter)
 350 {
 351         if (!(adapter->class & I2C_CLASS_HWMON))
 352                 return 0;
 353         return i2c_probe(adapter, &addr_data, adm1025_detect);
 354 }
 355
 356 static struct attribute *adm1025_attributes[] = {
 357         &sensor_dev_attr_in0_input.dev_attr.attr,
 358         &sensor_dev_attr_in1_input.dev_attr.attr,
 359         &sensor_dev_attr_in2_input.dev_attr.attr,
 360         &sensor_dev_attr_in3_input.dev_attr.attr,
 361         &sensor_dev_attr_in5_input.dev_attr.attr,
 362         &sensor_dev_attr_in0_min.dev_attr.attr,
 363         &sensor_dev_attr_in1_min.dev_attr.attr,
 364         &sensor_dev_attr_in2_min.dev_attr.attr,
 365         &sensor_dev_attr_in3_min.dev_attr.attr,
 366         &sensor_dev_attr_in5_min.dev_attr.attr,
 367         &sensor_dev_attr_in0_max.dev_attr.attr,
 368         &sensor_dev_attr_in1_max.dev_attr.attr,
 369         &sensor_dev_attr_in2_max.dev_attr.attr,
 370         &sensor_dev_attr_in3_max.dev_attr.attr,
 371         &sensor_dev_attr_in5_max.dev_attr.attr,
 372         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 373         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 374         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 375         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 376         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 377         &sensor_dev_attr_temp1_input.dev_attr.attr,
 378         &sensor_dev_attr_temp2_input.dev_attr.attr,
 379         &sensor_dev_attr_temp1_min.dev_attr.attr,
 380         &sensor_dev_attr_temp2_min.dev_attr.attr,
 381         &sensor_dev_attr_temp1_max.dev_attr.attr,
 382         &sensor_dev_attr_temp2_max.dev_attr.attr,
 383         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 384         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 385         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 386         &dev_attr_alarms.attr,
 387         &dev_attr_cpu0_vid.attr,
 388         &dev_attr_vrm.attr,
 389         NULL
 390 };
 391
 392 static const struct attribute_group adm1025_group = {
 393         .attrs = adm1025_attributes,
 394 };
 395
 396 static struct attribute *adm1025_attributes_in4[] = {
 397         &sensor_dev_attr_in4_input.dev_attr.attr,
 398         &sensor_dev_attr_in4_min.dev_attr.attr,
 399         &sensor_dev_attr_in4_max.dev_attr.attr,
 400         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 401         NULL
 402 };
 403
 404 static const struct attribute_group adm1025_group_in4 = {
 405         .attrs = adm1025_attributes_in4,
 406 };
 407
 408 /*
 409  * The following function does more than just detection. If detection
 410  * succeeds, it also registers the new chip.
 411  */
 412 static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind)
 413 {
 414         struct i2c_client *client;
 415         struct adm1025_data *data;
 416         int err = 0;
 417         const char *name = "";
 418         u8 config;
 419
 420         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 421                 goto exit;
 422
 423         if (!(data = kzalloc(sizeof(struct adm1025_data), GFP_KERNEL))) {
 424                 err = -ENOMEM;
 425                 goto exit;
 426         }
 427
 428         client = &data->client;
 429         i2c_set_clientdata(client, data);
 430         client->addr = address;
 431         client->adapter = adapter;
 432         client->driver = &adm1025_driver;
 433
 434         /*
 435          * Now we do the remaining detection. A negative kind means that
 436          * the driver was loaded with no force parameter (default), so we
 437          * must both detect and identify the chip. A zero kind means that
 438          * the driver was loaded with the force parameter, the detection
 439          * step shall be skipped. A positive kind means that the driver
 440          * was loaded with the force parameter and a given kind of chip is
 441          * requested, so both the detection and the identification steps
 442          * are skipped.
 443          */
 444         config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 445         if (kind < 0) { /* detection */
 446                 if ((config & 0x80) != 0x00
 447                  || (i2c_smbus_read_byte_data(client,
 448                      ADM1025_REG_STATUS1) & 0xC0) != 0x00
 449                  || (i2c_smbus_read_byte_data(client,
 450                      ADM1025_REG_STATUS2) & 0xBC) != 0x00) {
 451                         dev_dbg(&adapter->dev,
 452                                 "ADM1025 detection failed at 0x%02x.\n",
 453                                 address);
 454                         goto exit_free;
 455                 }
 456         }
 457
 458         if (kind <= 0) { /* identification */
 459                 u8 man_id, chip_id;
 460
 461                 man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
 462                 chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);
 463
 464                 if (man_id == 0x41) { /* Analog Devices */
 465                         if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */
 466                                 kind = adm1025;
 467                         }
 468                 } else
 469                 if (man_id == 0xA1) { /* Philips */
 470                         if (address != 0x2E
 471                          && (chip_id & 0xF0) == 0x20) { /* NE1619 */
 472                                 kind = ne1619;
 473                         }
 474                 }
 475
 476                 if (kind <= 0) { /* identification failed */
 477                         dev_info(&adapter->dev,
 478                             "Unsupported chip (man_id=0x%02X, "
 479                             "chip_id=0x%02X).\n", man_id, chip_id);
 480                         goto exit_free;
 481                 }
 482         }
 483
 484         if (kind == adm1025) {
 485                 name = "adm1025";
 486         } else if (kind == ne1619) {
 487                 name = "ne1619";
 488         }
 489
 490         /* We can fill in the remaining client fields */
 491         strlcpy(client->name, name, I2C_NAME_SIZE);
 492         mutex_init(&data->update_lock);
 493
 494         /* Tell the I2C layer a new client has arrived */
 495         if ((err = i2c_attach_client(client)))
 496                 goto exit_free;
 497
 498         /* Initialize the ADM1025 chip */
 499         adm1025_init_client(client);
 500
 501         /* Register sysfs hooks */
 502         if ((err = sysfs_create_group(&client->dev.kobj, &adm1025_group)))
 503                 goto exit_detach;
 504
 505         /* Pin 11 is either in4 (+12V) or VID4 */
 506         if (!(config & 0x20)) {
 507                 if ((err = sysfs_create_group(&client->dev.kobj,
 508                                               &adm1025_group_in4)))
 509                         goto exit_remove;
 510         }
 511
 512         data->hwmon_dev = hwmon_device_register(&client->dev);
 513         if (IS_ERR(data->hwmon_dev)) {
 514                 err = PTR_ERR(data->hwmon_dev);
 515                 goto exit_remove;
 516         }
 517
 518         return 0;
 519
 520 exit_remove:
 521         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 522         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 523 exit_detach:
 524         i2c_detach_client(client);
 525 exit_free:
 526         kfree(data);
 527 exit:
 528         return err;
 529 }
 530
 531 static void adm1025_init_client(struct i2c_client *client)
 532 {
 533         u8 reg;
 534         struct adm1025_data *data = i2c_get_clientdata(client);
 535         int i;
 536
 537         data->vrm = vid_which_vrm();
 538
 539         /*
 540          * Set high limits
 541          * Usually we avoid setting limits on driver init, but it happens
 542          * that the ADM1025 comes with stupid default limits (all registers
 543          * set to 0). In case the chip has not gone through any limit
 544          * setting yet, we better set the high limits to the max so that
 545          * no alarm triggers.
 546          */
 547         for (i=0; i<6; i++) {
 548                 reg = i2c_smbus_read_byte_data(client,
 549                                                ADM1025_REG_IN_MAX(i));
 550                 if (reg == 0)
 551                         i2c_smbus_write_byte_data(client,
 552                                                   ADM1025_REG_IN_MAX(i),
 553                                                   0xFF);
 554         }
 555         for (i=0; i<2; i++) {
 556                 reg = i2c_smbus_read_byte_data(client,
 557                                                ADM1025_REG_TEMP_HIGH(i));
 558                 if (reg == 0)
 559                         i2c_smbus_write_byte_data(client,
 560                                                   ADM1025_REG_TEMP_HIGH(i),
 561                                                   0x7F);
 562         }
 563
 564         /*
 565          * Start the conversions
 566          */
 567         reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 568         if (!(reg & 0x01))
 569                 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
 570                                           (reg&0x7E)|0x01);
 571 }
 572
 573 static int adm1025_detach_client(struct i2c_client *client)
 574 {
 575         struct adm1025_data *data = i2c_get_clientdata(client);
 576         int err;
 577
 578         hwmon_device_unregister(data->hwmon_dev);
 579         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 580         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 581
 582         if ((err = i2c_detach_client(client)))
 583                 return err;
 584
 585         kfree(data);
 586         return 0;
 587 }
 588
 589 static struct adm1025_data *adm1025_update_device(struct device *dev)
 590 {
 591         struct i2c_client *client = to_i2c_client(dev);
 592         struct adm1025_data *data = i2c_get_clientdata(client);
 593
 594         mutex_lock(&data->update_lock);
 595
 596         if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
 597                 int i;
 598
 599                 dev_dbg(&client->dev, "Updating data.\n");
 600                 for (i=0; i<6; i++) {
 601                         data->in[i] = i2c_smbus_read_byte_data(client,
 602                                       ADM1025_REG_IN(i));
 603                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 604                                           ADM1025_REG_IN_MIN(i));
 605                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 606                                           ADM1025_REG_IN_MAX(i));
 607                 }
 608                 for (i=0; i<2; i++) {
 609                         data->temp[i] = i2c_smbus_read_byte_data(client,
 610                                         ADM1025_REG_TEMP(i));
 611                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 612                                             ADM1025_REG_TEMP_LOW(i));
 613                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 614                                             ADM1025_REG_TEMP_HIGH(i));
 615                 }
 616                 data->alarms = i2c_smbus_read_byte_data(client,
 617                                ADM1025_REG_STATUS1)
 618                              | (i2c_smbus_read_byte_data(client,
 619                                 ADM1025_REG_STATUS2) << 8);
 620                 data->vid = (i2c_smbus_read_byte_data(client,
 621                              ADM1025_REG_VID) & 0x0f)
 622                           | ((i2c_smbus_read_byte_data(client,
 623                               ADM1025_REG_VID4) & 0x01) << 4);
 624
 625                 data->last_updated = jiffies;
 626                 data->valid = 1;
 627         }
 628
 629         mutex_unlock(&data->update_lock);
 630
 631         return data;
 632 }
 633
 634 static int __init sensors_adm1025_init(void)
 635 {
 636         return i2c_add_driver(&adm1025_driver);
 637 }
 638
 639 static void __exit sensors_adm1025_exit(void)
 640 {
 641         i2c_del_driver(&adm1025_driver);
 642 }
 643
 644 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
 645 MODULE_DESCRIPTION("ADM1025 driver");
 646 MODULE_LICENSE("GPL");
 647
 648 module_init(sensors_adm1025_init);
 649 module_exit(sensors_adm1025_exit);