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 <<<<<<< HEAD:drivers/hwmon/adm1025.c
  66 static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  67 =======
  68 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
  69 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/hwmon/adm1025.c
  70
  71 /*
  72  * Insmod parameters
  73  */
  74
  75 I2C_CLIENT_INSMOD_2(adm1025, ne1619);
  76
  77 /*
  78  * The ADM1025 registers
  79  */
  80
  81 #define ADM1025_REG_MAN_ID              0x3E
  82 #define ADM1025_REG_CHIP_ID             0x3F
  83 #define ADM1025_REG_CONFIG              0x40
  84 #define ADM1025_REG_STATUS1             0x41
  85 #define ADM1025_REG_STATUS2             0x42
  86 #define ADM1025_REG_IN(nr)              (0x20 + (nr))
  87 #define ADM1025_REG_IN_MAX(nr)          (0x2B + (nr) * 2)
  88 #define ADM1025_REG_IN_MIN(nr)          (0x2C + (nr) * 2)
  89 #define ADM1025_REG_TEMP(nr)            (0x26 + (nr))
  90 #define ADM1025_REG_TEMP_HIGH(nr)       (0x37 + (nr) * 2)
  91 #define ADM1025_REG_TEMP_LOW(nr)        (0x38 + (nr) * 2)
  92 #define ADM1025_REG_VID                 0x47
  93 #define ADM1025_REG_VID4                0x49
  94
  95 /*
  96  * Conversions and various macros
  97  * The ADM1025 uses signed 8-bit values for temperatures.
  98  */
  99
 100 static const int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
 101
 102 #define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
 103 #define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
 104                                  (val) * 192 >= (scale) * 255 ? 255 : \
 105                                  ((val) * 192 + (scale)/2) / (scale))
 106
 107 #define TEMP_FROM_REG(reg)      ((reg) * 1000)
 108 #define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
 109                                  (val) >= 126500 ? 127 : \
 110                                  (((val) < 0 ? (val)-500 : (val)+500) / 1000))
 111
 112 /*
 113  * Functions declaration
 114  */
 115
 116 static int adm1025_attach_adapter(struct i2c_adapter *adapter);
 117 static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind);
 118 static void adm1025_init_client(struct i2c_client *client);
 119 static int adm1025_detach_client(struct i2c_client *client);
 120 static struct adm1025_data *adm1025_update_device(struct device *dev);
 121
 122 /*
 123  * Driver data (common to all clients)
 124  */
 125
 126 static struct i2c_driver adm1025_driver = {
 127         .driver = {
 128                 .name   = "adm1025",
 129         },
 130         .attach_adapter = adm1025_attach_adapter,
 131         .detach_client  = adm1025_detach_client,
 132 };
 133
 134 /*
 135  * Client data (each client gets its own)
 136  */
 137
 138 struct adm1025_data {
 139         struct i2c_client client;
 140         struct device *hwmon_dev;
 141         struct mutex update_lock;
 142         char valid; /* zero until following fields are valid */
 143         unsigned long last_updated; /* in jiffies */
 144
 145         u8 in[6];               /* register value */
 146         u8 in_max[6];           /* register value */
 147         u8 in_min[6];           /* register value */
 148         s8 temp[2];             /* register value */
 149         s8 temp_min[2];         /* register value */
 150         s8 temp_max[2];         /* register value */
 151         u16 alarms;             /* register values, combined */
 152         u8 vid;                 /* register values, combined */
 153         u8 vrm;
 154 };
 155
 156 /*
 157  * Sysfs stuff
 158  */
 159
 160 static ssize_t
 161 show_in(struct device *dev, struct device_attribute *attr, char *buf)
 162 {
 163         int index = to_sensor_dev_attr(attr)->index;
 164         struct adm1025_data *data = adm1025_update_device(dev);
 165         return sprintf(buf, "%u\n", IN_FROM_REG(data->in[index],
 166                        in_scale[index]));
 167 }
 168
 169 static ssize_t
 170 show_in_min(struct device *dev, struct device_attribute *attr, char *buf)
 171 {
 172         int index = to_sensor_dev_attr(attr)->index;
 173         struct adm1025_data *data = adm1025_update_device(dev);
 174         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[index],
 175                        in_scale[index]));
 176 }
 177
 178 static ssize_t
 179 show_in_max(struct device *dev, struct device_attribute *attr, char *buf)
 180 {
 181         int index = to_sensor_dev_attr(attr)->index;
 182         struct adm1025_data *data = adm1025_update_device(dev);
 183         return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[index],
 184                        in_scale[index]));
 185 }
 186
 187 static ssize_t
 188 show_temp(struct device *dev, struct device_attribute *attr, char *buf)
 189 {
 190         int index = to_sensor_dev_attr(attr)->index;
 191         struct adm1025_data *data = adm1025_update_device(dev);
 192         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[index]));
 193 }
 194
 195 static ssize_t
 196 show_temp_min(struct device *dev, struct device_attribute *attr, char *buf)
 197 {
 198         int index = to_sensor_dev_attr(attr)->index;
 199         struct adm1025_data *data = adm1025_update_device(dev);
 200         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[index]));
 201 }
 202
 203 static ssize_t
 204 show_temp_max(struct device *dev, struct device_attribute *attr, char *buf)
 205 {
 206         int index = to_sensor_dev_attr(attr)->index;
 207         struct adm1025_data *data = adm1025_update_device(dev);
 208         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[index]));
 209 }
 210
 211 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 212                           const char *buf, size_t count)
 213 {
 214         int index = to_sensor_dev_attr(attr)->index;
 215         struct i2c_client *client = to_i2c_client(dev);
 216         struct adm1025_data *data = i2c_get_clientdata(client);
 217         long val = simple_strtol(buf, NULL, 10);
 218
 219         mutex_lock(&data->update_lock);
 220         data->in_min[index] = IN_TO_REG(val, in_scale[index]);
 221         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(index),
 222                                   data->in_min[index]);
 223         mutex_unlock(&data->update_lock);
 224         return count;
 225 }
 226
 227 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 228                           const char *buf, size_t count)
 229 {
 230         int index = to_sensor_dev_attr(attr)->index;
 231         struct i2c_client *client = to_i2c_client(dev);
 232         struct adm1025_data *data = i2c_get_clientdata(client);
 233         long val = simple_strtol(buf, NULL, 10);
 234
 235         mutex_lock(&data->update_lock);
 236         data->in_max[index] = IN_TO_REG(val, in_scale[index]);
 237         i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(index),
 238                                   data->in_max[index]);
 239         mutex_unlock(&data->update_lock);
 240         return count;
 241 }
 242
 243 #define set_in(offset) \
 244 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 245         show_in, NULL, offset); \
 246 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
 247         show_in_min, set_in_min, offset); \
 248 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
 249         show_in_max, set_in_max, offset)
 250 set_in(0);
 251 set_in(1);
 252 set_in(2);
 253 set_in(3);
 254 set_in(4);
 255 set_in(5);
 256
 257 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 258                             const char *buf, size_t count)
 259 {
 260         int index = to_sensor_dev_attr(attr)->index;
 261         struct i2c_client *client = to_i2c_client(dev);
 262         struct adm1025_data *data = i2c_get_clientdata(client);
 263         long val = simple_strtol(buf, NULL, 10);
 264
 265         mutex_lock(&data->update_lock);
 266         data->temp_min[index] = TEMP_TO_REG(val);
 267         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(index),
 268                                   data->temp_min[index]);
 269         mutex_unlock(&data->update_lock);
 270         return count;
 271 }
 272
 273 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 274         const char *buf, size_t count)
 275 {
 276         int index = to_sensor_dev_attr(attr)->index;
 277         struct i2c_client *client = to_i2c_client(dev);
 278         struct adm1025_data *data = i2c_get_clientdata(client);
 279         long val = simple_strtol(buf, NULL, 10);
 280
 281         mutex_lock(&data->update_lock);
 282         data->temp_max[index] = TEMP_TO_REG(val);
 283         i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(index),
 284                                   data->temp_max[index]);
 285         mutex_unlock(&data->update_lock);
 286         return count;
 287 }
 288
 289 #define set_temp(offset) \
 290 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
 291         show_temp, NULL, offset - 1); \
 292 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
 293         show_temp_min, set_temp_min, offset - 1); \
 294 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
 295         show_temp_max, set_temp_max, offset - 1)
 296 set_temp(1);
 297 set_temp(2);
 298
 299 static ssize_t
 300 show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
 301 {
 302         struct adm1025_data *data = adm1025_update_device(dev);
 303         return sprintf(buf, "%u\n", data->alarms);
 304 }
 305 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 306
 307 static ssize_t
 308 show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
 309 {
 310         int bitnr = to_sensor_dev_attr(attr)->index;
 311         struct adm1025_data *data = adm1025_update_device(dev);
 312         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 313 }
 314 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 315 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 316 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 317 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 318 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 319 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
 320 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 5);
 321 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 4);
 322 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_alarm, NULL, 14);
 323
 324 static ssize_t
 325 show_vid(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", vid_from_reg(data->vid, data->vrm));
 329 }
 330 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
 331
 332 static ssize_t
 333 show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
 334 {
 335         struct adm1025_data *data = dev_get_drvdata(dev);
 336         return sprintf(buf, "%u\n", data->vrm);
 337 }
 338 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
 339                        const char *buf, size_t count)
 340 {
 341         struct adm1025_data *data = dev_get_drvdata(dev);
 342         data->vrm = simple_strtoul(buf, NULL, 10);
 343         return count;
 344 }
 345 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
 346
 347 /*
 348  * Real code
 349  */
 350
 351 static int adm1025_attach_adapter(struct i2c_adapter *adapter)
 352 {
 353         if (!(adapter->class & I2C_CLASS_HWMON))
 354                 return 0;
 355         return i2c_probe(adapter, &addr_data, adm1025_detect);
 356 }
 357
 358 static struct attribute *adm1025_attributes[] = {
 359         &sensor_dev_attr_in0_input.dev_attr.attr,
 360         &sensor_dev_attr_in1_input.dev_attr.attr,
 361         &sensor_dev_attr_in2_input.dev_attr.attr,
 362         &sensor_dev_attr_in3_input.dev_attr.attr,
 363         &sensor_dev_attr_in5_input.dev_attr.attr,
 364         &sensor_dev_attr_in0_min.dev_attr.attr,
 365         &sensor_dev_attr_in1_min.dev_attr.attr,
 366         &sensor_dev_attr_in2_min.dev_attr.attr,
 367         &sensor_dev_attr_in3_min.dev_attr.attr,
 368         &sensor_dev_attr_in5_min.dev_attr.attr,
 369         &sensor_dev_attr_in0_max.dev_attr.attr,
 370         &sensor_dev_attr_in1_max.dev_attr.attr,
 371         &sensor_dev_attr_in2_max.dev_attr.attr,
 372         &sensor_dev_attr_in3_max.dev_attr.attr,
 373         &sensor_dev_attr_in5_max.dev_attr.attr,
 374         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 375         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 376         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 377         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 378         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 379         &sensor_dev_attr_temp1_input.dev_attr.attr,
 380         &sensor_dev_attr_temp2_input.dev_attr.attr,
 381         &sensor_dev_attr_temp1_min.dev_attr.attr,
 382         &sensor_dev_attr_temp2_min.dev_attr.attr,
 383         &sensor_dev_attr_temp1_max.dev_attr.attr,
 384         &sensor_dev_attr_temp2_max.dev_attr.attr,
 385         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 386         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 387         &sensor_dev_attr_temp1_fault.dev_attr.attr,
 388         &dev_attr_alarms.attr,
 389         &dev_attr_cpu0_vid.attr,
 390         &dev_attr_vrm.attr,
 391         NULL
 392 };
 393
 394 static const struct attribute_group adm1025_group = {
 395         .attrs = adm1025_attributes,
 396 };
 397
 398 static struct attribute *adm1025_attributes_in4[] = {
 399         &sensor_dev_attr_in4_input.dev_attr.attr,
 400         &sensor_dev_attr_in4_min.dev_attr.attr,
 401         &sensor_dev_attr_in4_max.dev_attr.attr,
 402         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 403         NULL
 404 };
 405
 406 static const struct attribute_group adm1025_group_in4 = {
 407         .attrs = adm1025_attributes_in4,
 408 };
 409
 410 /*
 411  * The following function does more than just detection. If detection
 412  * succeeds, it also registers the new chip.
 413  */
 414 static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind)
 415 {
 416         struct i2c_client *client;
 417         struct adm1025_data *data;
 418         int err = 0;
 419         const char *name = "";
 420         u8 config;
 421
 422         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 423                 goto exit;
 424
 425         if (!(data = kzalloc(sizeof(struct adm1025_data), GFP_KERNEL))) {
 426                 err = -ENOMEM;
 427                 goto exit;
 428         }
 429
 430         client = &data->client;
 431         i2c_set_clientdata(client, data);
 432         client->addr = address;
 433         client->adapter = adapter;
 434         client->driver = &adm1025_driver;
 435
 436         /*
 437          * Now we do the remaining detection. A negative kind means that
 438          * the driver was loaded with no force parameter (default), so we
 439          * must both detect and identify the chip. A zero kind means that
 440          * the driver was loaded with the force parameter, the detection
 441          * step shall be skipped. A positive kind means that the driver
 442          * was loaded with the force parameter and a given kind of chip is
 443          * requested, so both the detection and the identification steps
 444          * are skipped.
 445          */
 446         config = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 447         if (kind < 0) { /* detection */
 448                 if ((config & 0x80) != 0x00
 449                  || (i2c_smbus_read_byte_data(client,
 450                      ADM1025_REG_STATUS1) & 0xC0) != 0x00
 451                  || (i2c_smbus_read_byte_data(client,
 452                      ADM1025_REG_STATUS2) & 0xBC) != 0x00) {
 453                         dev_dbg(&adapter->dev,
 454                                 "ADM1025 detection failed at 0x%02x.\n",
 455                                 address);
 456                         goto exit_free;
 457                 }
 458         }
 459
 460         if (kind <= 0) { /* identification */
 461                 u8 man_id, chip_id;
 462
 463                 man_id = i2c_smbus_read_byte_data(client, ADM1025_REG_MAN_ID);
 464                 chip_id = i2c_smbus_read_byte_data(client, ADM1025_REG_CHIP_ID);
 465
 466                 if (man_id == 0x41) { /* Analog Devices */
 467                         if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */
 468                                 kind = adm1025;
 469                         }
 470                 } else
 471                 if (man_id == 0xA1) { /* Philips */
 472                         if (address != 0x2E
 473                          && (chip_id & 0xF0) == 0x20) { /* NE1619 */
 474                                 kind = ne1619;
 475                         }
 476                 }
 477
 478                 if (kind <= 0) { /* identification failed */
 479                         dev_info(&adapter->dev,
 480                             "Unsupported chip (man_id=0x%02X, "
 481                             "chip_id=0x%02X).\n", man_id, chip_id);
 482                         goto exit_free;
 483                 }
 484         }
 485
 486         if (kind == adm1025) {
 487                 name = "adm1025";
 488         } else if (kind == ne1619) {
 489                 name = "ne1619";
 490         }
 491
 492         /* We can fill in the remaining client fields */
 493         strlcpy(client->name, name, I2C_NAME_SIZE);
 494         mutex_init(&data->update_lock);
 495
 496         /* Tell the I2C layer a new client has arrived */
 497         if ((err = i2c_attach_client(client)))
 498                 goto exit_free;
 499
 500         /* Initialize the ADM1025 chip */
 501         adm1025_init_client(client);
 502
 503         /* Register sysfs hooks */
 504         if ((err = sysfs_create_group(&client->dev.kobj, &adm1025_group)))
 505                 goto exit_detach;
 506
 507         /* Pin 11 is either in4 (+12V) or VID4 */
 508         if (!(config & 0x20)) {
 509                 if ((err = sysfs_create_group(&client->dev.kobj,
 510                                               &adm1025_group_in4)))
 511                         goto exit_remove;
 512         }
 513
 514         data->hwmon_dev = hwmon_device_register(&client->dev);
 515         if (IS_ERR(data->hwmon_dev)) {
 516                 err = PTR_ERR(data->hwmon_dev);
 517                 goto exit_remove;
 518         }
 519
 520         return 0;
 521
 522 exit_remove:
 523         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 524         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 525 exit_detach:
 526         i2c_detach_client(client);
 527 exit_free:
 528         kfree(data);
 529 exit:
 530         return err;
 531 }
 532
 533 static void adm1025_init_client(struct i2c_client *client)
 534 {
 535         u8 reg;
 536         struct adm1025_data *data = i2c_get_clientdata(client);
 537         int i;
 538
 539         data->vrm = vid_which_vrm();
 540
 541         /*
 542          * Set high limits
 543          * Usually we avoid setting limits on driver init, but it happens
 544          * that the ADM1025 comes with stupid default limits (all registers
 545          * set to 0). In case the chip has not gone through any limit
 546          * setting yet, we better set the high limits to the max so that
 547          * no alarm triggers.
 548          */
 549         for (i=0; i<6; i++) {
 550                 reg = i2c_smbus_read_byte_data(client,
 551                                                ADM1025_REG_IN_MAX(i));
 552                 if (reg == 0)
 553                         i2c_smbus_write_byte_data(client,
 554                                                   ADM1025_REG_IN_MAX(i),
 555                                                   0xFF);
 556         }
 557         for (i=0; i<2; i++) {
 558                 reg = i2c_smbus_read_byte_data(client,
 559                                                ADM1025_REG_TEMP_HIGH(i));
 560                 if (reg == 0)
 561                         i2c_smbus_write_byte_data(client,
 562                                                   ADM1025_REG_TEMP_HIGH(i),
 563                                                   0x7F);
 564         }
 565
 566         /*
 567          * Start the conversions
 568          */
 569         reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
 570         if (!(reg & 0x01))
 571                 i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
 572                                           (reg&0x7E)|0x01);
 573 }
 574
 575 static int adm1025_detach_client(struct i2c_client *client)
 576 {
 577         struct adm1025_data *data = i2c_get_clientdata(client);
 578         int err;
 579
 580         hwmon_device_unregister(data->hwmon_dev);
 581         sysfs_remove_group(&client->dev.kobj, &adm1025_group);
 582         sysfs_remove_group(&client->dev.kobj, &adm1025_group_in4);
 583
 584         if ((err = i2c_detach_client(client)))
 585                 return err;
 586
 587         kfree(data);
 588         return 0;
 589 }
 590
 591 static struct adm1025_data *adm1025_update_device(struct device *dev)
 592 {
 593         struct i2c_client *client = to_i2c_client(dev);
 594         struct adm1025_data *data = i2c_get_clientdata(client);
 595
 596         mutex_lock(&data->update_lock);
 597
 598         if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
 599                 int i;
 600
 601                 dev_dbg(&client->dev, "Updating data.\n");
 602                 for (i=0; i<6; i++) {
 603                         data->in[i] = i2c_smbus_read_byte_data(client,
 604                                       ADM1025_REG_IN(i));
 605                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 606                                           ADM1025_REG_IN_MIN(i));
 607                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 608                                           ADM1025_REG_IN_MAX(i));
 609                 }
 610                 for (i=0; i<2; i++) {
 611                         data->temp[i] = i2c_smbus_read_byte_data(client,
 612                                         ADM1025_REG_TEMP(i));
 613                         data->temp_min[i] = i2c_smbus_read_byte_data(client,
 614                                             ADM1025_REG_TEMP_LOW(i));
 615                         data->temp_max[i] = i2c_smbus_read_byte_data(client,
 616                                             ADM1025_REG_TEMP_HIGH(i));
 617                 }
 618                 data->alarms = i2c_smbus_read_byte_data(client,
 619                                ADM1025_REG_STATUS1)
 620                              | (i2c_smbus_read_byte_data(client,
 621                                 ADM1025_REG_STATUS2) << 8);
 622                 data->vid = (i2c_smbus_read_byte_data(client,
 623                              ADM1025_REG_VID) & 0x0f)
 624                           | ((i2c_smbus_read_byte_data(client,
 625                               ADM1025_REG_VID4) & 0x01) << 4);
 626
 627                 data->last_updated = jiffies;
 628                 data->valid = 1;
 629         }
 630
 631         mutex_unlock(&data->update_lock);
 632
 633         return data;
 634 }
 635
 636 static int __init sensors_adm1025_init(void)
 637 {
 638         return i2c_add_driver(&adm1025_driver);
 639 }
 640
 641 static void __exit sensors_adm1025_exit(void)
 642 {
 643         i2c_del_driver(&adm1025_driver);
 644 }
 645
 646 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
 647 MODULE_DESCRIPTION("ADM1025 driver");
 648 MODULE_LICENSE("GPL");
 649
 650 module_init(sensors_adm1025_init);
 651 module_exit(sensors_adm1025_exit);