drivers/hwmon/lm95234.c

   1 /*
   2  * Driver for Texas Instruments / National Semiconductor LM95234
   3  *
   4  * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
   5  *
   6  * Derived from lm95241.c
   7  * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/slab.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/i2c.h>
  25 #include <linux/hwmon.h>
  26 #include <linux/hwmon-sysfs.h>
  27 #include <linux/err.h>
  28 #include <linux/mutex.h>
  29 #include <linux/sysfs.h>
  30
  31 #define DRVNAME "lm95234"
  32
  33 static const unsigned short normal_i2c[] = { 0x18, 0x4d, 0x4e, I2C_CLIENT_END };
  34
  35 /* LM95234 registers */
  36 #define LM95234_REG_MAN_ID              0xFE
  37 #define LM95234_REG_CHIP_ID             0xFF
  38 #define LM95234_REG_STATUS              0x02
  39 #define LM95234_REG_CONFIG              0x03
  40 #define LM95234_REG_CONVRATE            0x04
  41 #define LM95234_REG_STS_FAULT           0x07
  42 #define LM95234_REG_STS_TCRIT1          0x08
  43 #define LM95234_REG_STS_TCRIT2          0x09
  44 #define LM95234_REG_TEMPH(x)            ((x) + 0x10)
  45 #define LM95234_REG_TEMPL(x)            ((x) + 0x20)
  46 #define LM95234_REG_UTEMPH(x)           ((x) + 0x19)    /* Remote only */
  47 #define LM95234_REG_UTEMPL(x)           ((x) + 0x29)
  48 #define LM95234_REG_REM_MODEL           0x30
  49 #define LM95234_REG_REM_MODEL_STS       0x38
  50 #define LM95234_REG_OFFSET(x)           ((x) + 0x31)    /* Remote only */
  51 #define LM95234_REG_TCRIT1(x)           ((x) + 0x40)
  52 #define LM95234_REG_TCRIT2(x)           ((x) + 0x49)    /* Remote channel 1,2 */
  53 #define LM95234_REG_TCRIT_HYST          0x5a
  54
  55 #define NATSEMI_MAN_ID                  0x01
  56 #define LM95234_CHIP_ID                 0x79
  57
  58 /* Client data (each client gets its own) */
  59 struct lm95234_data {
  60         struct device *hwmon_dev;
  61         struct mutex update_lock;
  62         unsigned long last_updated, interval;   /* in jiffies */
  63         bool valid;             /* false until following fields are valid */
  64         /* registers values */
  65         int temp[5];            /* temperature (signed) */
  66         u32 status;             /* fault/alarm status */
  67         u8 tcrit1[5];           /* critical temperature limit */
  68         u8 tcrit2[2];           /* high temperature limit */
  69         s8 toffset[4];          /* remote temperature offset */
  70         u8 thyst;               /* common hysteresis */
  71
  72         u8 sensor_type;         /* temperature sensor type */
  73 };
  74
  75 static int lm95234_read_temp(struct i2c_client *client, int index, int *t)
  76 {
  77         int val;
  78         u16 temp = 0;
  79
  80         if (index) {
  81                 val = i2c_smbus_read_byte_data(client,
  82                                                LM95234_REG_UTEMPH(index - 1));
  83                 if (val < 0)
  84                         return val;
  85                 temp = val << 8;
  86                 val = i2c_smbus_read_byte_data(client,
  87                                                LM95234_REG_UTEMPL(index - 1));
  88                 if (val < 0)
  89                         return val;
  90                 temp |= val;
  91                 *t = temp;
  92         }
  93         /*
  94          * Read signed temperature if unsigned temperature is 0,
  95          * or if this is the local sensor.
  96          */
  97         if (!temp) {
  98                 val = i2c_smbus_read_byte_data(client,
  99                                                LM95234_REG_TEMPH(index));
 100                 if (val < 0)
 101                         return val;
 102                 temp = val << 8;
 103                 val = i2c_smbus_read_byte_data(client,
 104                                                LM95234_REG_TEMPL(index));
 105                 if (val < 0)
 106                         return val;
 107                 temp |= val;
 108                 *t = (s16)temp;
 109         }
 110         return 0;
 111 }
 112
 113 static u16 update_intervals[] = { 143, 364, 1000, 2500 };
 114
 115 /* Fill value cache. Must be called with update lock held. */
 116
 117 static int lm95234_fill_cache(struct i2c_client *client)
 118 {
 119         struct lm95234_data *data = i2c_get_clientdata(client);
 120         int i, ret;
 121
 122         ret = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
 123         if (ret < 0)
 124                 return ret;
 125
 126         data->interval = msecs_to_jiffies(update_intervals[ret & 0x03]);
 127
 128         for (i = 0; i < ARRAY_SIZE(data->tcrit1); i++) {
 129                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT1(i));
 130                 if (ret < 0)
 131                         return ret;
 132                 data->tcrit1[i] = ret;
 133         }
 134         for (i = 0; i < ARRAY_SIZE(data->tcrit2); i++) {
 135                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT2(i));
 136                 if (ret < 0)
 137                         return ret;
 138                 data->tcrit2[i] = ret;
 139         }
 140         for (i = 0; i < ARRAY_SIZE(data->toffset); i++) {
 141                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_OFFSET(i));
 142                 if (ret < 0)
 143                         return ret;
 144                 data->toffset[i] = ret;
 145         }
 146
 147         ret = i2c_smbus_read_byte_data(client, LM95234_REG_TCRIT_HYST);
 148         if (ret < 0)
 149                 return ret;
 150         data->thyst = ret;
 151
 152         ret = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
 153         if (ret < 0)
 154                 return ret;
 155         data->sensor_type = ret;
 156
 157         return 0;
 158 }
 159
 160 static int lm95234_update_device(struct i2c_client *client,
 161                                  struct lm95234_data *data)
 162 {
 163         int ret;
 164
 165         mutex_lock(&data->update_lock);
 166
 167         if (time_after(jiffies, data->last_updated + data->interval) ||
 168             !data->valid) {
 169                 int i;
 170
 171                 if (!data->valid) {
 172                         ret = lm95234_fill_cache(client);
 173                         if (ret < 0)
 174                                 goto abort;
 175                 }
 176
 177                 data->valid = false;
 178                 for (i = 0; i < ARRAY_SIZE(data->temp); i++) {
 179                         ret = lm95234_read_temp(client, i, &data->temp[i]);
 180                         if (ret < 0)
 181                                 goto abort;
 182                 }
 183
 184                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_FAULT);
 185                 if (ret < 0)
 186                         goto abort;
 187                 data->status = ret;
 188
 189                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT1);
 190                 if (ret < 0)
 191                         goto abort;
 192                 data->status |= ret << 8;
 193
 194                 ret = i2c_smbus_read_byte_data(client, LM95234_REG_STS_TCRIT2);
 195                 if (ret < 0)
 196                         goto abort;
 197                 data->status |= ret << 16;
 198
 199                 data->last_updated = jiffies;
 200                 data->valid = true;
 201         }
 202         ret = 0;
 203 abort:
 204         mutex_unlock(&data->update_lock);
 205
 206         return ret;
 207 }
 208
 209 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 210                          char *buf)
 211 {
 212         struct i2c_client *client = to_i2c_client(dev);
 213         struct lm95234_data *data = i2c_get_clientdata(client);
 214         int index = to_sensor_dev_attr(attr)->index;
 215         int ret = lm95234_update_device(client, data);
 216
 217         if (ret)
 218                 return ret;
 219
 220         return sprintf(buf, "%d\n",
 221                        DIV_ROUND_CLOSEST(data->temp[index] * 125, 32));
 222 }
 223
 224 static ssize_t show_alarm(struct device *dev,
 225                           struct device_attribute *attr, char *buf)
 226 {
 227         struct i2c_client *client = to_i2c_client(dev);
 228         struct lm95234_data *data = i2c_get_clientdata(client);
 229         u32 mask = to_sensor_dev_attr(attr)->index;
 230         int ret = lm95234_update_device(client, data);
 231
 232         if (ret)
 233                 return ret;
 234
 235         return sprintf(buf, "%u", !!(data->status & mask));
 236 }
 237
 238 static ssize_t show_type(struct device *dev, struct device_attribute *attr,
 239                          char *buf)
 240 {
 241         struct i2c_client *client = to_i2c_client(dev);
 242         struct lm95234_data *data = i2c_get_clientdata(client);
 243         u8 mask = to_sensor_dev_attr(attr)->index;
 244         int ret = lm95234_update_device(client, data);
 245
 246         if (ret)
 247                 return ret;
 248
 249         return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n");
 250 }
 251
 252 static ssize_t set_type(struct device *dev, struct device_attribute *attr,
 253                         const char *buf, size_t count)
 254 {
 255         struct i2c_client *client = to_i2c_client(dev);
 256         struct lm95234_data *data = i2c_get_clientdata(client);
 257         unsigned long val;
 258         u8 mask = to_sensor_dev_attr(attr)->index;
 259         int ret = lm95234_update_device(client, data);
 260
 261         if (ret)
 262                 return ret;
 263
 264         ret = kstrtoul(buf, 10, &val);
 265         if (ret < 0)
 266                 return ret;
 267
 268         if (val != 1 && val != 2)
 269                 return -EINVAL;
 270
 271         mutex_lock(&data->update_lock);
 272         if (val == 1)
 273                 data->sensor_type |= mask;
 274         else
 275                 data->sensor_type &= ~mask;
 276         data->valid = false;
 277         i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
 278                                   data->sensor_type);
 279         mutex_unlock(&data->update_lock);
 280
 281         return count;
 282 }
 283
 284 static ssize_t show_tcrit2(struct device *dev, struct device_attribute *attr,
 285                            char *buf)
 286 {
 287         struct i2c_client *client = to_i2c_client(dev);
 288         struct lm95234_data *data = i2c_get_clientdata(client);
 289         int index = to_sensor_dev_attr(attr)->index;
 290         int ret = lm95234_update_device(client, data);
 291
 292         if (ret)
 293                 return ret;
 294
 295         return sprintf(buf, "%u", data->tcrit2[index] * 1000);
 296 }
 297
 298 static ssize_t set_tcrit2(struct device *dev, struct device_attribute *attr,
 299                           const char *buf, size_t count)
 300 {
 301         struct i2c_client *client = to_i2c_client(dev);
 302         struct lm95234_data *data = i2c_get_clientdata(client);
 303         int index = to_sensor_dev_attr(attr)->index;
 304         long val;
 305         int ret = lm95234_update_device(client, data);
 306
 307         if (ret)
 308                 return ret;
 309
 310         ret = kstrtol(buf, 10, &val);
 311         if (ret < 0)
 312                 return ret;
 313
 314         val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127);
 315
 316         mutex_lock(&data->update_lock);
 317         data->tcrit2[index] = val;
 318         i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT2(index), val);
 319         mutex_unlock(&data->update_lock);
 320
 321         return count;
 322 }
 323
 324 static ssize_t show_tcrit2_hyst(struct device *dev,
 325                                 struct device_attribute *attr, char *buf)
 326 {
 327         struct i2c_client *client = to_i2c_client(dev);
 328         struct lm95234_data *data = i2c_get_clientdata(client);
 329         int index = to_sensor_dev_attr(attr)->index;
 330         int ret = lm95234_update_device(client, data);
 331
 332         if (ret)
 333                 return ret;
 334
 335         /* Result can be negative, so be careful with unsigned operands */
 336         return sprintf(buf, "%d",
 337                        ((int)data->tcrit2[index] - (int)data->thyst) * 1000);
 338 }
 339
 340 static ssize_t show_tcrit1(struct device *dev, struct device_attribute *attr,
 341                            char *buf)
 342 {
 343         struct i2c_client *client = to_i2c_client(dev);
 344         struct lm95234_data *data = i2c_get_clientdata(client);
 345         int index = to_sensor_dev_attr(attr)->index;
 346
 347         return sprintf(buf, "%u", data->tcrit1[index] * 1000);
 348 }
 349
 350 static ssize_t set_tcrit1(struct device *dev, struct device_attribute *attr,
 351                           const char *buf, size_t count)
 352 {
 353         struct i2c_client *client = to_i2c_client(dev);
 354         struct lm95234_data *data = i2c_get_clientdata(client);
 355         int index = to_sensor_dev_attr(attr)->index;
 356         long val;
 357         int ret = lm95234_update_device(client, data);
 358
 359         if (ret)
 360                 return ret;
 361
 362         ret = kstrtol(buf, 10, &val);
 363         if (ret < 0)
 364                 return ret;
 365
 366         val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);
 367
 368         mutex_lock(&data->update_lock);
 369         data->tcrit1[index] = val;
 370         i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT1(index), val);
 371         mutex_unlock(&data->update_lock);
 372
 373         return count;
 374 }
 375
 376 static ssize_t show_tcrit1_hyst(struct device *dev,
 377                                 struct device_attribute *attr, char *buf)
 378 {
 379         struct i2c_client *client = to_i2c_client(dev);
 380         struct lm95234_data *data = i2c_get_clientdata(client);
 381         int index = to_sensor_dev_attr(attr)->index;
 382         int ret = lm95234_update_device(client, data);
 383
 384         if (ret)
 385                 return ret;
 386
 387         /* Result can be negative, so be careful with unsigned operands */
 388         return sprintf(buf, "%d",
 389                        ((int)data->tcrit1[index] - (int)data->thyst) * 1000);
 390 }
 391
 392 static ssize_t set_tcrit1_hyst(struct device *dev,
 393                                struct device_attribute *attr,
 394                                const char *buf, size_t count)
 395 {
 396         struct i2c_client *client = to_i2c_client(dev);
 397         struct lm95234_data *data = i2c_get_clientdata(client);
 398         int index = to_sensor_dev_attr(attr)->index;
 399         long val;
 400         int ret = lm95234_update_device(client, data);
 401
 402         if (ret)
 403                 return ret;
 404
 405         ret = kstrtol(buf, 10, &val);
 406         if (ret < 0)
 407                 return ret;
 408
 409         val = DIV_ROUND_CLOSEST(val, 1000);
 410         val = clamp_val((int)data->tcrit1[index] - val, 0, 31);
 411
 412         mutex_lock(&data->update_lock);
 413         data->thyst = val;
 414         i2c_smbus_write_byte_data(client, LM95234_REG_TCRIT_HYST, val);
 415         mutex_unlock(&data->update_lock);
 416
 417         return count;
 418 }
 419
 420 static ssize_t show_offset(struct device *dev, struct device_attribute *attr,
 421                            char *buf)
 422 {
 423         struct i2c_client *client = to_i2c_client(dev);
 424         struct lm95234_data *data = i2c_get_clientdata(client);
 425         int index = to_sensor_dev_attr(attr)->index;
 426         int ret = lm95234_update_device(client, data);
 427
 428         if (ret)
 429                 return ret;
 430
 431         return sprintf(buf, "%d", data->toffset[index] * 500);
 432 }
 433
 434 static ssize_t set_offset(struct device *dev, struct device_attribute *attr,
 435                           const char *buf, size_t count)
 436 {
 437         struct i2c_client *client = to_i2c_client(dev);
 438         struct lm95234_data *data = i2c_get_clientdata(client);
 439         int index = to_sensor_dev_attr(attr)->index;
 440         long val;
 441         int ret = lm95234_update_device(client, data);
 442
 443         if (ret)
 444                 return ret;
 445
 446         ret = kstrtol(buf, 10, &val);
 447         if (ret < 0)
 448                 return ret;
 449
 450         /* Accuracy is 1/2 degrees C */
 451         val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127);
 452
 453         mutex_lock(&data->update_lock);
 454         data->toffset[index] = val;
 455         i2c_smbus_write_byte_data(client, LM95234_REG_OFFSET(index), val);
 456         mutex_unlock(&data->update_lock);
 457
 458         return count;
 459 }
 460
 461 static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
 462                              char *buf)
 463 {
 464         struct i2c_client *client = to_i2c_client(dev);
 465         struct lm95234_data *data = i2c_get_clientdata(client);
 466         int ret = lm95234_update_device(client, data);
 467
 468         if (ret)
 469                 return ret;
 470
 471         return sprintf(buf, "%lu\n",
 472                        DIV_ROUND_CLOSEST(data->interval * 1000, HZ));
 473 }
 474
 475 static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
 476                             const char *buf, size_t count)
 477 {
 478         struct i2c_client *client = to_i2c_client(dev);
 479         struct lm95234_data *data = i2c_get_clientdata(client);
 480         unsigned long val;
 481         u8 regval;
 482         int ret = lm95234_update_device(client, data);
 483
 484         if (ret)
 485                 return ret;
 486
 487         ret = kstrtoul(buf, 10, &val);
 488         if (ret < 0)
 489                 return ret;
 490
 491         for (regval = 0; regval < 3; regval++) {
 492                 if (val <= update_intervals[regval])
 493                         break;
 494         }
 495
 496         mutex_lock(&data->update_lock);
 497         data->interval = msecs_to_jiffies(update_intervals[regval]);
 498         i2c_smbus_write_byte_data(client, LM95234_REG_CONVRATE, regval);
 499         mutex_unlock(&data->update_lock);
 500
 501         return count;
 502 }
 503
 504 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 505 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 506 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 507 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 508 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
 509
 510 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
 511                           BIT(0) | BIT(1));
 512 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL,
 513                           BIT(2) | BIT(3));
 514 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL,
 515                           BIT(4) | BIT(5));
 516 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL,
 517                           BIT(6) | BIT(7));
 518
 519 static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
 520                           BIT(1));
 521 static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
 522                           BIT(2));
 523 static SENSOR_DEVICE_ATTR(temp4_type, S_IWUSR | S_IRUGO, show_type, set_type,
 524                           BIT(3));
 525 static SENSOR_DEVICE_ATTR(temp5_type, S_IWUSR | S_IRUGO, show_type, set_type,
 526                           BIT(4));
 527
 528 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_tcrit1,
 529                           set_tcrit1, 0);
 530 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_tcrit2,
 531                           set_tcrit2, 0);
 532 static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_tcrit2,
 533                           set_tcrit2, 1);
 534 static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_tcrit1,
 535                           set_tcrit1, 3);
 536 static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_tcrit1,
 537                           set_tcrit1, 4);
 538
 539 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_tcrit1_hyst,
 540                           set_tcrit1_hyst, 0);
 541 static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 0);
 542 static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 1);
 543 static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 3);
 544 static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 4);
 545
 546 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
 547                           BIT(0 + 8));
 548 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
 549                           BIT(1 + 16));
 550 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
 551                           BIT(2 + 16));
 552 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
 553                           BIT(3 + 8));
 554 static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
 555                           BIT(4 + 8));
 556
 557 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_tcrit1,
 558                           set_tcrit1, 1);
 559 static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_tcrit1,
 560                           set_tcrit1, 2);
 561
 562 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 1);
 563 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 2);
 564
 565 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
 566                           BIT(1 + 8));
 567 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
 568                           BIT(2 + 8));
 569
 570 static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_offset,
 571                           set_offset, 0);
 572 static SENSOR_DEVICE_ATTR(temp3_offset, S_IWUSR | S_IRUGO, show_offset,
 573                           set_offset, 1);
 574 static SENSOR_DEVICE_ATTR(temp4_offset, S_IWUSR | S_IRUGO, show_offset,
 575                           set_offset, 2);
 576 static SENSOR_DEVICE_ATTR(temp5_offset, S_IWUSR | S_IRUGO, show_offset,
 577                           set_offset, 3);
 578
 579 static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
 580                    set_interval);
 581
 582 static struct attribute *lm95234_attributes[] = {
 583         &sensor_dev_attr_temp1_input.dev_attr.attr,
 584         &sensor_dev_attr_temp2_input.dev_attr.attr,
 585         &sensor_dev_attr_temp3_input.dev_attr.attr,
 586         &sensor_dev_attr_temp4_input.dev_attr.attr,
 587         &sensor_dev_attr_temp5_input.dev_attr.attr,
 588         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 589         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 590         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 591         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 592         &sensor_dev_attr_temp2_type.dev_attr.attr,
 593         &sensor_dev_attr_temp3_type.dev_attr.attr,
 594         &sensor_dev_attr_temp4_type.dev_attr.attr,
 595         &sensor_dev_attr_temp5_type.dev_attr.attr,
 596         &sensor_dev_attr_temp1_max.dev_attr.attr,
 597         &sensor_dev_attr_temp2_max.dev_attr.attr,
 598         &sensor_dev_attr_temp3_max.dev_attr.attr,
 599         &sensor_dev_attr_temp4_max.dev_attr.attr,
 600         &sensor_dev_attr_temp5_max.dev_attr.attr,
 601         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 602         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 603         &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 604         &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 605         &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
 606         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 607         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 608         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 609         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 610         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 611         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 612         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 613         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 614         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 615         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 616         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 617         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 618         &sensor_dev_attr_temp3_offset.dev_attr.attr,
 619         &sensor_dev_attr_temp4_offset.dev_attr.attr,
 620         &sensor_dev_attr_temp5_offset.dev_attr.attr,
 621         &dev_attr_update_interval.attr,
 622         NULL
 623 };
 624
 625 static const struct attribute_group lm95234_group = {
 626         .attrs = lm95234_attributes,
 627 };
 628
 629 static int lm95234_detect(struct i2c_client *client,
 630                           struct i2c_board_info *info)
 631 {
 632         struct i2c_adapter *adapter = client->adapter;
 633         int mfg_id, chip_id, val;
 634
 635         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 636                 return -ENODEV;
 637
 638         mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
 639         if (mfg_id != NATSEMI_MAN_ID)
 640                 return -ENODEV;
 641
 642         chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
 643         if (chip_id != LM95234_CHIP_ID)
 644                 return -ENODEV;
 645
 646         val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
 647         if (val & 0x30)
 648                 return -ENODEV;
 649
 650         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
 651         if (val & 0xbc)
 652                 return -ENODEV;
 653
 654         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
 655         if (val & 0xfc)
 656                 return -ENODEV;
 657
 658         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
 659         if (val & 0xe1)
 660                 return -ENODEV;
 661
 662         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
 663         if (val & 0xe1)
 664                 return -ENODEV;
 665
 666         strlcpy(info->type, "lm95234", I2C_NAME_SIZE);
 667         return 0;
 668 }
 669
 670 static int lm95234_init_client(struct i2c_client *client)
 671 {
 672         int val, model;
 673
 674         /* start conversion if necessary */
 675         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
 676         if (val < 0)
 677                 return val;
 678         if (val & 0x40)
 679                 i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG,
 680                                           val & ~0x40);
 681
 682         /* If diode type status reports an error, try to fix it */
 683         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
 684         if (val < 0)
 685                 return val;
 686         model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
 687         if (model < 0)
 688                 return model;
 689         if (model & val) {
 690                 dev_notice(&client->dev,
 691                            "Fixing remote diode type misconfiguration (0x%x)\n",
 692                            val);
 693                 i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
 694                                           model & ~val);
 695         }
 696         return 0;
 697 }
 698
 699 static int lm95234_probe(struct i2c_client *client,
 700                          const struct i2c_device_id *id)
 701 {
 702         struct device *dev = &client->dev;
 703         struct lm95234_data *data;
 704         int err;
 705
 706         data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
 707         if (!data)
 708                 return -ENOMEM;
 709
 710         i2c_set_clientdata(client, data);
 711         mutex_init(&data->update_lock);
 712
 713         /* Initialize the LM95234 chip */
 714         err = lm95234_init_client(client);
 715         if (err < 0)
 716                 return err;
 717
 718         /* Register sysfs hooks */
 719         err = sysfs_create_group(&dev->kobj, &lm95234_group);
 720         if (err)
 721                 return err;
 722
 723         data->hwmon_dev = hwmon_device_register(dev);
 724         if (IS_ERR(data->hwmon_dev)) {
 725                 err = PTR_ERR(data->hwmon_dev);
 726                 goto exit_remove_files;
 727         }
 728
 729         return 0;
 730
 731 exit_remove_files:
 732         sysfs_remove_group(&dev->kobj, &lm95234_group);
 733         return err;
 734 }
 735
 736 static int lm95234_remove(struct i2c_client *client)
 737 {
 738         struct lm95234_data *data = i2c_get_clientdata(client);
 739
 740         hwmon_device_unregister(data->hwmon_dev);
 741         sysfs_remove_group(&client->dev.kobj, &lm95234_group);
 742
 743         return 0;
 744 }
 745
 746 /* Driver data (common to all clients) */
 747 static const struct i2c_device_id lm95234_id[] = {
 748         { "lm95234", 0 },
 749         { }
 750 };
 751 MODULE_DEVICE_TABLE(i2c, lm95234_id);
 752
 753 static struct i2c_driver lm95234_driver = {
 754         .class          = I2C_CLASS_HWMON,
 755         .driver = {
 756                 .name   = DRVNAME,
 757         },
 758         .probe          = lm95234_probe,
 759         .remove         = lm95234_remove,
 760         .id_table       = lm95234_id,
 761         .detect         = lm95234_detect,
 762         .address_list   = normal_i2c,
 763 };
 764
 765 module_i2c_driver(lm95234_driver);
 766
 767 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 768 MODULE_DESCRIPTION("LM95234 sensor driver");
 769 MODULE_LICENSE("GPL");