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 i2c_client *client;
  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 lm95234_data *data,
 118                               struct i2c_client *client)
 119 {
 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 lm95234_data *data)
 161 {
 162         struct i2c_client *client = data->client;
 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(data, 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 lm95234_data *data = dev_get_drvdata(dev);
 213         int index = to_sensor_dev_attr(attr)->index;
 214         int ret = lm95234_update_device(data);
 215
 216         if (ret)
 217                 return ret;
 218
 219         return sprintf(buf, "%d\n",
 220                        DIV_ROUND_CLOSEST(data->temp[index] * 125, 32));
 221 }
 222
 223 static ssize_t show_alarm(struct device *dev,
 224                           struct device_attribute *attr, char *buf)
 225 {
 226         struct lm95234_data *data = dev_get_drvdata(dev);
 227         u32 mask = to_sensor_dev_attr(attr)->index;
 228         int ret = lm95234_update_device(data);
 229
 230         if (ret)
 231                 return ret;
 232
 233         return sprintf(buf, "%u", !!(data->status & mask));
 234 }
 235
 236 static ssize_t show_type(struct device *dev, struct device_attribute *attr,
 237                          char *buf)
 238 {
 239         struct lm95234_data *data = dev_get_drvdata(dev);
 240         u8 mask = to_sensor_dev_attr(attr)->index;
 241         int ret = lm95234_update_device(data);
 242
 243         if (ret)
 244                 return ret;
 245
 246         return sprintf(buf, data->sensor_type & mask ? "1\n" : "2\n");
 247 }
 248
 249 static ssize_t set_type(struct device *dev, struct device_attribute *attr,
 250                         const char *buf, size_t count)
 251 {
 252         struct lm95234_data *data = dev_get_drvdata(dev);
 253         unsigned long val;
 254         u8 mask = to_sensor_dev_attr(attr)->index;
 255         int ret = lm95234_update_device(data);
 256
 257         if (ret)
 258                 return ret;
 259
 260         ret = kstrtoul(buf, 10, &val);
 261         if (ret < 0)
 262                 return ret;
 263
 264         if (val != 1 && val != 2)
 265                 return -EINVAL;
 266
 267         mutex_lock(&data->update_lock);
 268         if (val == 1)
 269                 data->sensor_type |= mask;
 270         else
 271                 data->sensor_type &= ~mask;
 272         data->valid = false;
 273         i2c_smbus_write_byte_data(data->client, LM95234_REG_REM_MODEL,
 274                                   data->sensor_type);
 275         mutex_unlock(&data->update_lock);
 276
 277         return count;
 278 }
 279
 280 static ssize_t show_tcrit2(struct device *dev, struct device_attribute *attr,
 281                            char *buf)
 282 {
 283         struct lm95234_data *data = dev_get_drvdata(dev);
 284         int index = to_sensor_dev_attr(attr)->index;
 285         int ret = lm95234_update_device(data);
 286
 287         if (ret)
 288                 return ret;
 289
 290         return sprintf(buf, "%u", data->tcrit2[index] * 1000);
 291 }
 292
 293 static ssize_t set_tcrit2(struct device *dev, struct device_attribute *attr,
 294                           const char *buf, size_t count)
 295 {
 296         struct lm95234_data *data = dev_get_drvdata(dev);
 297         int index = to_sensor_dev_attr(attr)->index;
 298         long val;
 299         int ret = lm95234_update_device(data);
 300
 301         if (ret)
 302                 return ret;
 303
 304         ret = kstrtol(buf, 10, &val);
 305         if (ret < 0)
 306                 return ret;
 307
 308         val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, index ? 255 : 127);
 309
 310         mutex_lock(&data->update_lock);
 311         data->tcrit2[index] = val;
 312         i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT2(index), val);
 313         mutex_unlock(&data->update_lock);
 314
 315         return count;
 316 }
 317
 318 static ssize_t show_tcrit2_hyst(struct device *dev,
 319                                 struct device_attribute *attr, char *buf)
 320 {
 321         struct lm95234_data *data = dev_get_drvdata(dev);
 322         int index = to_sensor_dev_attr(attr)->index;
 323         int ret = lm95234_update_device(data);
 324
 325         if (ret)
 326                 return ret;
 327
 328         /* Result can be negative, so be careful with unsigned operands */
 329         return sprintf(buf, "%d",
 330                        ((int)data->tcrit2[index] - (int)data->thyst) * 1000);
 331 }
 332
 333 static ssize_t show_tcrit1(struct device *dev, struct device_attribute *attr,
 334                            char *buf)
 335 {
 336         struct lm95234_data *data = dev_get_drvdata(dev);
 337         int index = to_sensor_dev_attr(attr)->index;
 338
 339         return sprintf(buf, "%u", data->tcrit1[index] * 1000);
 340 }
 341
 342 static ssize_t set_tcrit1(struct device *dev, struct device_attribute *attr,
 343                           const char *buf, size_t count)
 344 {
 345         struct lm95234_data *data = dev_get_drvdata(dev);
 346         int index = to_sensor_dev_attr(attr)->index;
 347         int ret = lm95234_update_device(data);
 348         long val;
 349
 350         if (ret)
 351                 return ret;
 352
 353         ret = kstrtol(buf, 10, &val);
 354         if (ret < 0)
 355                 return ret;
 356
 357         val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);
 358
 359         mutex_lock(&data->update_lock);
 360         data->tcrit1[index] = val;
 361         i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT1(index), val);
 362         mutex_unlock(&data->update_lock);
 363
 364         return count;
 365 }
 366
 367 static ssize_t show_tcrit1_hyst(struct device *dev,
 368                                 struct device_attribute *attr, char *buf)
 369 {
 370         struct lm95234_data *data = dev_get_drvdata(dev);
 371         int index = to_sensor_dev_attr(attr)->index;
 372         int ret = lm95234_update_device(data);
 373
 374         if (ret)
 375                 return ret;
 376
 377         /* Result can be negative, so be careful with unsigned operands */
 378         return sprintf(buf, "%d",
 379                        ((int)data->tcrit1[index] - (int)data->thyst) * 1000);
 380 }
 381
 382 static ssize_t set_tcrit1_hyst(struct device *dev,
 383                                struct device_attribute *attr,
 384                                const char *buf, size_t count)
 385 {
 386         struct lm95234_data *data = dev_get_drvdata(dev);
 387         int index = to_sensor_dev_attr(attr)->index;
 388         int ret = lm95234_update_device(data);
 389         long val;
 390
 391         if (ret)
 392                 return ret;
 393
 394         ret = kstrtol(buf, 10, &val);
 395         if (ret < 0)
 396                 return ret;
 397
 398         val = DIV_ROUND_CLOSEST(val, 1000);
 399         val = clamp_val((int)data->tcrit1[index] - val, 0, 31);
 400
 401         mutex_lock(&data->update_lock);
 402         data->thyst = val;
 403         i2c_smbus_write_byte_data(data->client, LM95234_REG_TCRIT_HYST, val);
 404         mutex_unlock(&data->update_lock);
 405
 406         return count;
 407 }
 408
 409 static ssize_t show_offset(struct device *dev, struct device_attribute *attr,
 410                            char *buf)
 411 {
 412         struct lm95234_data *data = dev_get_drvdata(dev);
 413         int index = to_sensor_dev_attr(attr)->index;
 414         int ret = lm95234_update_device(data);
 415
 416         if (ret)
 417                 return ret;
 418
 419         return sprintf(buf, "%d", data->toffset[index] * 500);
 420 }
 421
 422 static ssize_t set_offset(struct device *dev, struct device_attribute *attr,
 423                           const char *buf, size_t count)
 424 {
 425         struct lm95234_data *data = dev_get_drvdata(dev);
 426         int index = to_sensor_dev_attr(attr)->index;
 427         int ret = lm95234_update_device(data);
 428         long val;
 429
 430         if (ret)
 431                 return ret;
 432
 433         ret = kstrtol(buf, 10, &val);
 434         if (ret < 0)
 435                 return ret;
 436
 437         /* Accuracy is 1/2 degrees C */
 438         val = clamp_val(DIV_ROUND_CLOSEST(val, 500), -128, 127);
 439
 440         mutex_lock(&data->update_lock);
 441         data->toffset[index] = val;
 442         i2c_smbus_write_byte_data(data->client, LM95234_REG_OFFSET(index), val);
 443         mutex_unlock(&data->update_lock);
 444
 445         return count;
 446 }
 447
 448 static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
 449                              char *buf)
 450 {
 451         struct lm95234_data *data = dev_get_drvdata(dev);
 452         int ret = lm95234_update_device(data);
 453
 454         if (ret)
 455                 return ret;
 456
 457         return sprintf(buf, "%lu\n",
 458                        DIV_ROUND_CLOSEST(data->interval * 1000, HZ));
 459 }
 460
 461 static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
 462                             const char *buf, size_t count)
 463 {
 464         struct lm95234_data *data = dev_get_drvdata(dev);
 465         int ret = lm95234_update_device(data);
 466         unsigned long val;
 467         u8 regval;
 468
 469         if (ret)
 470                 return ret;
 471
 472         ret = kstrtoul(buf, 10, &val);
 473         if (ret < 0)
 474                 return ret;
 475
 476         for (regval = 0; regval < 3; regval++) {
 477                 if (val <= update_intervals[regval])
 478                         break;
 479         }
 480
 481         mutex_lock(&data->update_lock);
 482         data->interval = msecs_to_jiffies(update_intervals[regval]);
 483         i2c_smbus_write_byte_data(data->client, LM95234_REG_CONVRATE, regval);
 484         mutex_unlock(&data->update_lock);
 485
 486         return count;
 487 }
 488
 489 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
 490 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
 491 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
 492 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
 493 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
 494
 495 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
 496                           BIT(0) | BIT(1));
 497 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL,
 498                           BIT(2) | BIT(3));
 499 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL,
 500                           BIT(4) | BIT(5));
 501 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL,
 502                           BIT(6) | BIT(7));
 503
 504 static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
 505                           BIT(1));
 506 static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
 507                           BIT(2));
 508 static SENSOR_DEVICE_ATTR(temp4_type, S_IWUSR | S_IRUGO, show_type, set_type,
 509                           BIT(3));
 510 static SENSOR_DEVICE_ATTR(temp5_type, S_IWUSR | S_IRUGO, show_type, set_type,
 511                           BIT(4));
 512
 513 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_tcrit1,
 514                           set_tcrit1, 0);
 515 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_tcrit2,
 516                           set_tcrit2, 0);
 517 static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_tcrit2,
 518                           set_tcrit2, 1);
 519 static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_tcrit1,
 520                           set_tcrit1, 3);
 521 static SENSOR_DEVICE_ATTR(temp5_max, S_IWUSR | S_IRUGO, show_tcrit1,
 522                           set_tcrit1, 4);
 523
 524 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_tcrit1_hyst,
 525                           set_tcrit1_hyst, 0);
 526 static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 0);
 527 static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_tcrit2_hyst, NULL, 1);
 528 static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 3);
 529 static SENSOR_DEVICE_ATTR(temp5_max_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 4);
 530
 531 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
 532                           BIT(0 + 8));
 533 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL,
 534                           BIT(1 + 16));
 535 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL,
 536                           BIT(2 + 16));
 537 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL,
 538                           BIT(3 + 8));
 539 static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL,
 540                           BIT(4 + 8));
 541
 542 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_tcrit1,
 543                           set_tcrit1, 1);
 544 static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_tcrit1,
 545                           set_tcrit1, 2);
 546
 547 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 1);
 548 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_tcrit1_hyst, NULL, 2);
 549
 550 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
 551                           BIT(1 + 8));
 552 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL,
 553                           BIT(2 + 8));
 554
 555 static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_offset,
 556                           set_offset, 0);
 557 static SENSOR_DEVICE_ATTR(temp3_offset, S_IWUSR | S_IRUGO, show_offset,
 558                           set_offset, 1);
 559 static SENSOR_DEVICE_ATTR(temp4_offset, S_IWUSR | S_IRUGO, show_offset,
 560                           set_offset, 2);
 561 static SENSOR_DEVICE_ATTR(temp5_offset, S_IWUSR | S_IRUGO, show_offset,
 562                           set_offset, 3);
 563
 564 static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
 565                    set_interval);
 566
 567 static struct attribute *lm95234_attrs[] = {
 568         &sensor_dev_attr_temp1_input.dev_attr.attr,
 569         &sensor_dev_attr_temp2_input.dev_attr.attr,
 570         &sensor_dev_attr_temp3_input.dev_attr.attr,
 571         &sensor_dev_attr_temp4_input.dev_attr.attr,
 572         &sensor_dev_attr_temp5_input.dev_attr.attr,
 573         &sensor_dev_attr_temp2_fault.dev_attr.attr,
 574         &sensor_dev_attr_temp3_fault.dev_attr.attr,
 575         &sensor_dev_attr_temp4_fault.dev_attr.attr,
 576         &sensor_dev_attr_temp5_fault.dev_attr.attr,
 577         &sensor_dev_attr_temp2_type.dev_attr.attr,
 578         &sensor_dev_attr_temp3_type.dev_attr.attr,
 579         &sensor_dev_attr_temp4_type.dev_attr.attr,
 580         &sensor_dev_attr_temp5_type.dev_attr.attr,
 581         &sensor_dev_attr_temp1_max.dev_attr.attr,
 582         &sensor_dev_attr_temp2_max.dev_attr.attr,
 583         &sensor_dev_attr_temp3_max.dev_attr.attr,
 584         &sensor_dev_attr_temp4_max.dev_attr.attr,
 585         &sensor_dev_attr_temp5_max.dev_attr.attr,
 586         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 587         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 588         &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 589         &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 590         &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
 591         &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
 592         &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
 593         &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
 594         &sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 595         &sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
 596         &sensor_dev_attr_temp2_crit.dev_attr.attr,
 597         &sensor_dev_attr_temp3_crit.dev_attr.attr,
 598         &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
 599         &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
 600         &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
 601         &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
 602         &sensor_dev_attr_temp2_offset.dev_attr.attr,
 603         &sensor_dev_attr_temp3_offset.dev_attr.attr,
 604         &sensor_dev_attr_temp4_offset.dev_attr.attr,
 605         &sensor_dev_attr_temp5_offset.dev_attr.attr,
 606         &dev_attr_update_interval.attr,
 607         NULL
 608 };
 609 ATTRIBUTE_GROUPS(lm95234);
 610
 611 static int lm95234_detect(struct i2c_client *client,
 612                           struct i2c_board_info *info)
 613 {
 614         struct i2c_adapter *adapter = client->adapter;
 615         int mfg_id, chip_id, val;
 616
 617         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 618                 return -ENODEV;
 619
 620         mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);
 621         if (mfg_id != NATSEMI_MAN_ID)
 622                 return -ENODEV;
 623
 624         chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);
 625         if (chip_id != LM95234_CHIP_ID)
 626                 return -ENODEV;
 627
 628         val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);
 629         if (val & 0x30)
 630                 return -ENODEV;
 631
 632         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
 633         if (val & 0xbc)
 634                 return -ENODEV;
 635
 636         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);
 637         if (val & 0xfc)
 638                 return -ENODEV;
 639
 640         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
 641         if (val & 0xe1)
 642                 return -ENODEV;
 643
 644         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
 645         if (val & 0xe1)
 646                 return -ENODEV;
 647
 648         strlcpy(info->type, "lm95234", I2C_NAME_SIZE);
 649         return 0;
 650 }
 651
 652 static int lm95234_init_client(struct i2c_client *client)
 653 {
 654         int val, model;
 655
 656         /* start conversion if necessary */
 657         val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);
 658         if (val < 0)
 659                 return val;
 660         if (val & 0x40)
 661                 i2c_smbus_write_byte_data(client, LM95234_REG_CONFIG,
 662                                           val & ~0x40);
 663
 664         /* If diode type status reports an error, try to fix it */
 665         val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);
 666         if (val < 0)
 667                 return val;
 668         model = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);
 669         if (model < 0)
 670                 return model;
 671         if (model & val) {
 672                 dev_notice(&client->dev,
 673                            "Fixing remote diode type misconfiguration (0x%x)\n",
 674                            val);
 675                 i2c_smbus_write_byte_data(client, LM95234_REG_REM_MODEL,
 676                                           model & ~val);
 677         }
 678         return 0;
 679 }
 680
 681 static int lm95234_probe(struct i2c_client *client,
 682                          const struct i2c_device_id *id)
 683 {
 684         struct device *dev = &client->dev;
 685         struct lm95234_data *data;
 686         struct device *hwmon_dev;
 687         int err;
 688
 689         data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);
 690         if (!data)
 691                 return -ENOMEM;
 692
 693         data->client = client;
 694         mutex_init(&data->update_lock);
 695
 696         /* Initialize the LM95234 chip */
 697         err = lm95234_init_client(client);
 698         if (err < 0)
 699                 return err;
 700
 701         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 702                                                            data,
 703                                                            lm95234_groups);
 704         return PTR_ERR_OR_ZERO(hwmon_dev);
 705 }
 706
 707 /* Driver data (common to all clients) */
 708 static const struct i2c_device_id lm95234_id[] = {
 709         { "lm95234", 0 },
 710         { }
 711 };
 712 MODULE_DEVICE_TABLE(i2c, lm95234_id);
 713
 714 static struct i2c_driver lm95234_driver = {
 715         .class          = I2C_CLASS_HWMON,
 716         .driver = {
 717                 .name   = DRVNAME,
 718         },
 719         .probe          = lm95234_probe,
 720         .id_table       = lm95234_id,
 721         .detect         = lm95234_detect,
 722         .address_list   = normal_i2c,
 723 };
 724
 725 module_i2c_driver(lm95234_driver);
 726
 727 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 728 MODULE_DESCRIPTION("LM95234 sensor driver");
 729 MODULE_LICENSE("GPL");