drivers/hwmon/lm95245.c

   1 /*
   2  * Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
   3  *
   4  * The LM95245 is a sensor chip made by TI / National Semiconductor.
   5  * It reports up to two temperatures (its own plus an external one).
   6  *
   7  * This driver is based on lm95241.c
   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/err.h>
  21 #include <linux/init.h>
  22 #include <linux/hwmon.h>
  23 #include <linux/i2c.h>
  24 #include <linux/module.h>
  25 #include <linux/mutex.h>
  26 #include <linux/regmap.h>
  27 #include <linux/slab.h>
  28
  29 static const unsigned short normal_i2c[] = {
  30         0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
  31
  32 /* LM95245 registers */
  33 /* general registers */
  34 #define LM95245_REG_RW_CONFIG1          0x03
  35 #define LM95245_REG_RW_CONVERS_RATE     0x04
  36 #define LM95245_REG_W_ONE_SHOT          0x0F
  37
  38 /* diode configuration */
  39 #define LM95245_REG_RW_CONFIG2          0xBF
  40 #define LM95245_REG_RW_REMOTE_OFFH      0x11
  41 #define LM95245_REG_RW_REMOTE_OFFL      0x12
  42
  43 /* status registers */
  44 #define LM95245_REG_R_STATUS1           0x02
  45 #define LM95245_REG_R_STATUS2           0x33
  46
  47 /* limit registers */
  48 #define LM95245_REG_RW_REMOTE_OS_LIMIT          0x07
  49 #define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT     0x20
  50 #define LM95245_REG_RW_REMOTE_TCRIT_LIMIT       0x19
  51 #define LM95245_REG_RW_COMMON_HYSTERESIS        0x21
  52
  53 /* temperature signed */
  54 #define LM95245_REG_R_LOCAL_TEMPH_S     0x00
  55 #define LM95245_REG_R_LOCAL_TEMPL_S     0x30
  56 #define LM95245_REG_R_REMOTE_TEMPH_S    0x01
  57 #define LM95245_REG_R_REMOTE_TEMPL_S    0x10
  58 /* temperature unsigned */
  59 #define LM95245_REG_R_REMOTE_TEMPH_U    0x31
  60 #define LM95245_REG_R_REMOTE_TEMPL_U    0x32
  61
  62 /* id registers */
  63 #define LM95245_REG_R_MAN_ID            0xFE
  64 #define LM95245_REG_R_CHIP_ID           0xFF
  65
  66 /* LM95245 specific bitfields */
  67 #define CFG_STOP                0x40
  68 #define CFG_REMOTE_TCRIT_MASK   0x10
  69 #define CFG_REMOTE_OS_MASK      0x08
  70 #define CFG_LOCAL_TCRIT_MASK    0x04
  71 #define CFG_LOCAL_OS_MASK       0x02
  72
  73 #define CFG2_OS_A0              0x40
  74 #define CFG2_DIODE_FAULT_OS     0x20
  75 #define CFG2_DIODE_FAULT_TCRIT  0x10
  76 #define CFG2_REMOTE_TT          0x08
  77 #define CFG2_REMOTE_FILTER_DIS  0x00
  78 #define CFG2_REMOTE_FILTER_EN   0x06
  79
  80 /* conversation rate in ms */
  81 #define RATE_CR0063     0x00
  82 #define RATE_CR0364     0x01
  83 #define RATE_CR1000     0x02
  84 #define RATE_CR2500     0x03
  85
  86 #define STATUS1_ROS             0x10
  87 #define STATUS1_DIODE_FAULT     0x04
  88 #define STATUS1_RTCRIT          0x02
  89 #define STATUS1_LOC             0x01
  90
  91 #define MANUFACTURER_ID         0x01
  92 #define LM95235_REVISION        0xB1
  93 #define LM95245_REVISION        0xB3
  94
  95 static const u8 lm95245_reg_address[] = {
  96         LM95245_REG_R_LOCAL_TEMPH_S,
  97         LM95245_REG_R_LOCAL_TEMPL_S,
  98         LM95245_REG_R_REMOTE_TEMPH_S,
  99         LM95245_REG_R_REMOTE_TEMPL_S,
 100         LM95245_REG_R_REMOTE_TEMPH_U,
 101         LM95245_REG_R_REMOTE_TEMPL_U,
 102         LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
 103         LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
 104         LM95245_REG_RW_COMMON_HYSTERESIS,
 105         LM95245_REG_R_STATUS1,
 106 };
 107
 108 /* Client data (each client gets its own) */
 109 struct lm95245_data {
 110         struct regmap *regmap;
 111         struct mutex update_lock;
 112         int interval;   /* in msecs */
 113 };
 114
 115 /* Conversions */
 116 static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
 117 {
 118         return val_h * 1000 + val_l * 1000 / 256;
 119 }
 120
 121 static int temp_from_reg_signed(u8 val_h, u8 val_l)
 122 {
 123         if (val_h & 0x80)
 124                 return (val_h - 0x100) * 1000;
 125         return temp_from_reg_unsigned(val_h, val_l);
 126 }
 127
 128 static int lm95245_read_conversion_rate(struct lm95245_data *data)
 129 {
 130         unsigned int rate;
 131         int ret;
 132
 133         ret = regmap_read(data->regmap, LM95245_REG_RW_CONVERS_RATE, &rate);
 134         if (ret < 0)
 135                 return ret;
 136
 137         switch (rate) {
 138         case RATE_CR0063:
 139                 data->interval = 63;
 140                 break;
 141         case RATE_CR0364:
 142                 data->interval = 364;
 143                 break;
 144         case RATE_CR1000:
 145                 data->interval = 1000;
 146                 break;
 147         case RATE_CR2500:
 148         default:
 149                 data->interval = 2500;
 150                 break;
 151         }
 152         return 0;
 153 }
 154
 155 static int lm95245_set_conversion_rate(struct lm95245_data *data, long interval)
 156 {
 157         int ret, rate;
 158
 159         if (interval <= 63) {
 160                 interval = 63;
 161                 rate = RATE_CR0063;
 162         } else if (interval <= 364) {
 163                 interval = 364;
 164                 rate = RATE_CR0364;
 165         } else if (interval <= 1000) {
 166                 interval = 1000;
 167                 rate = RATE_CR1000;
 168         } else {
 169                 interval = 2500;
 170                 rate = RATE_CR2500;
 171         }
 172
 173         ret = regmap_write(data->regmap, LM95245_REG_RW_CONVERS_RATE, rate);
 174         if (ret < 0)
 175                 return ret;
 176
 177         data->interval = interval;
 178         return 0;
 179 }
 180
 181 static int lm95245_read_temp(struct device *dev, u32 attr, int channel,
 182                              long *val)
 183 {
 184         struct lm95245_data *data = dev_get_drvdata(dev);
 185         struct regmap *regmap = data->regmap;
 186         int ret, regl, regh, regvall, regvalh;
 187
 188         switch (attr) {
 189         case hwmon_temp_input:
 190                 regl = channel ? LM95245_REG_R_REMOTE_TEMPL_S :
 191                                  LM95245_REG_R_LOCAL_TEMPL_S;
 192                 regh = channel ? LM95245_REG_R_REMOTE_TEMPH_S :
 193                                  LM95245_REG_R_LOCAL_TEMPH_S;
 194                 ret = regmap_read(regmap, regl, &regvall);
 195                 if (ret < 0)
 196                         return ret;
 197                 ret = regmap_read(regmap, regh, &regvalh);
 198                 if (ret < 0)
 199                         return ret;
 200                 /*
 201                  * Local temp is always signed.
 202                  * Remote temp has both signed and unsigned data.
 203                  * Use signed calculation for remote if signed bit is set
 204                  * or if reported temperature is below signed limit.
 205                  */
 206                 if (!channel || (regvalh & 0x80) || regvalh < 0x7f) {
 207                         *val = temp_from_reg_signed(regvalh, regvall);
 208                         return 0;
 209                 }
 210                 ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPL_U,
 211                                   &regvall);
 212                 if (ret < 0)
 213                         return ret;
 214                 ret = regmap_read(regmap, LM95245_REG_R_REMOTE_TEMPH_U,
 215                                   &regvalh);
 216                 if (ret < 0)
 217                         return ret;
 218                 *val = temp_from_reg_unsigned(regvalh, regvall);
 219                 return 0;
 220         case hwmon_temp_max:
 221                 ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT,
 222                                   &regvalh);
 223                 if (ret < 0)
 224                         return ret;
 225                 *val = regvalh * 1000;
 226                 return 0;
 227         case hwmon_temp_crit:
 228                 regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
 229                                  LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
 230                 ret = regmap_read(regmap, regh, &regvalh);
 231                 if (ret < 0)
 232                         return ret;
 233                 *val = regvalh * 1000;
 234                 return 0;
 235         case hwmon_temp_max_hyst:
 236                 ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT,
 237                                   &regvalh);
 238                 if (ret < 0)
 239                         return ret;
 240                 ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
 241                                   &regvall);
 242                 if (ret < 0)
 243                         return ret;
 244                 *val = (regvalh - regvall) * 1000;
 245                 return 0;
 246         case hwmon_temp_crit_hyst:
 247                 regh = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
 248                                  LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
 249                 ret = regmap_read(regmap, regh, &regvalh);
 250                 if (ret < 0)
 251                         return ret;
 252                 ret = regmap_read(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
 253                                   &regvall);
 254                 if (ret < 0)
 255                         return ret;
 256                 *val = (regvalh - regvall) * 1000;
 257                 return 0;
 258         case hwmon_temp_type:
 259                 ret = regmap_read(regmap, LM95245_REG_RW_CONFIG2, &regvalh);
 260                 if (ret < 0)
 261                         return ret;
 262                 *val = (regvalh & CFG2_REMOTE_TT) ? 1 : 2;
 263                 return 0;
 264         case hwmon_temp_offset:
 265                 ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFL,
 266                                   &regvall);
 267                 if (ret < 0)
 268                         return ret;
 269                 ret = regmap_read(regmap, LM95245_REG_RW_REMOTE_OFFH,
 270                                   &regvalh);
 271                 if (ret < 0)
 272                         return ret;
 273                 *val = temp_from_reg_signed(regvalh, regvall);
 274                 return 0;
 275         case hwmon_temp_max_alarm:
 276                 ret = regmap_read(regmap, LM95245_REG_R_STATUS1, &regvalh);
 277                 if (ret < 0)
 278                         return ret;
 279                 *val = !!(regvalh & STATUS1_ROS);
 280                 return 0;
 281         case hwmon_temp_crit_alarm:
 282                 ret = regmap_read(regmap, LM95245_REG_R_STATUS1, &regvalh);
 283                 if (ret < 0)
 284                         return ret;
 285                 *val = !!(regvalh & (channel ? STATUS1_RTCRIT : STATUS1_LOC));
 286                 return 0;
 287         case hwmon_temp_fault:
 288                 ret = regmap_read(regmap, LM95245_REG_R_STATUS1, &regvalh);
 289                 if (ret < 0)
 290                         return ret;
 291                 *val = !!(regvalh & STATUS1_DIODE_FAULT);
 292                 return 0;
 293         default:
 294                 return -EOPNOTSUPP;
 295         }
 296 }
 297
 298 static int lm95245_write_temp(struct device *dev, u32 attr, int channel,
 299                               long val)
 300 {
 301         struct lm95245_data *data = dev_get_drvdata(dev);
 302         struct regmap *regmap = data->regmap;
 303         unsigned int regval;
 304         int ret, reg;
 305
 306         switch (attr) {
 307         case hwmon_temp_max:
 308                 val = clamp_val(val / 1000, 0, 255);
 309                 ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OS_LIMIT, val);
 310                 return ret;
 311         case hwmon_temp_crit:
 312                 reg = channel ? LM95245_REG_RW_REMOTE_TCRIT_LIMIT :
 313                                 LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT;
 314                 val = clamp_val(val / 1000, 0, channel ? 255 : 127);
 315                 ret = regmap_write(regmap, reg, val);
 316                 return ret;
 317         case hwmon_temp_crit_hyst:
 318                 mutex_lock(&data->update_lock);
 319                 ret = regmap_read(regmap, LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
 320                                   &regval);
 321                 if (ret < 0) {
 322                         mutex_unlock(&data->update_lock);
 323                         return ret;
 324                 }
 325                 /* Clamp to reasonable range to prevent overflow */
 326                 val = clamp_val(val, -1000000, 1000000);
 327                 val = regval - val / 1000;
 328                 val = clamp_val(val, 0, 31);
 329                 ret = regmap_write(regmap, LM95245_REG_RW_COMMON_HYSTERESIS,
 330                                    val);
 331                 mutex_unlock(&data->update_lock);
 332                 return ret;
 333         case hwmon_temp_offset:
 334                 val = clamp_val(val, -128000, 127875);
 335                 val = val * 256 / 1000;
 336                 mutex_lock(&data->update_lock);
 337                 ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFL,
 338                                    val & 0xe0);
 339                 if (ret < 0) {
 340                         mutex_unlock(&data->update_lock);
 341                         return ret;
 342                 }
 343                 ret = regmap_write(regmap, LM95245_REG_RW_REMOTE_OFFH,
 344                                    (val >> 8) & 0xff);
 345                 mutex_unlock(&data->update_lock);
 346                 return ret;
 347         case hwmon_temp_type:
 348                 if (val != 1 && val != 2)
 349                         return -EINVAL;
 350                 ret = regmap_update_bits(regmap, LM95245_REG_RW_CONFIG2,
 351                                          CFG2_REMOTE_TT,
 352                                          val == 1 ? CFG2_REMOTE_TT : 0);
 353                 return ret;
 354         default:
 355                 return -EOPNOTSUPP;
 356         }
 357 }
 358
 359 static int lm95245_read_chip(struct device *dev, u32 attr, int channel,
 360                              long *val)
 361 {
 362         struct lm95245_data *data = dev_get_drvdata(dev);
 363
 364         switch (attr) {
 365         case hwmon_chip_update_interval:
 366                 *val = data->interval;
 367                 return 0;
 368         default:
 369                 return -EOPNOTSUPP;
 370         }
 371 }
 372
 373 static int lm95245_write_chip(struct device *dev, u32 attr, int channel,
 374                               long val)
 375 {
 376         struct lm95245_data *data = dev_get_drvdata(dev);
 377         int ret;
 378
 379         switch (attr) {
 380         case hwmon_chip_update_interval:
 381                 mutex_lock(&data->update_lock);
 382                 ret = lm95245_set_conversion_rate(data, val);
 383                 mutex_unlock(&data->update_lock);
 384                 return ret;
 385         default:
 386                 return -EOPNOTSUPP;
 387         }
 388 }
 389
 390 static int lm95245_read(struct device *dev, enum hwmon_sensor_types type,
 391                         u32 attr, int channel, long *val)
 392 {
 393         switch (type) {
 394         case hwmon_chip:
 395                 return lm95245_read_chip(dev, attr, channel, val);
 396         case hwmon_temp:
 397                 return lm95245_read_temp(dev, attr, channel, val);
 398         default:
 399                 return -EOPNOTSUPP;
 400         }
 401 }
 402
 403 static int lm95245_write(struct device *dev, enum hwmon_sensor_types type,
 404                          u32 attr, int channel, long val)
 405 {
 406         switch (type) {
 407         case hwmon_chip:
 408                 return lm95245_write_chip(dev, attr, channel, val);
 409         case hwmon_temp:
 410                 return lm95245_write_temp(dev, attr, channel, val);
 411         default:
 412                 return -EOPNOTSUPP;
 413         }
 414 }
 415
 416 static umode_t lm95245_temp_is_visible(const void *data, u32 attr, int channel)
 417 {
 418         switch (attr) {
 419         case hwmon_temp_input:
 420         case hwmon_temp_max_alarm:
 421         case hwmon_temp_max_hyst:
 422         case hwmon_temp_crit_alarm:
 423         case hwmon_temp_fault:
 424                 return S_IRUGO;
 425         case hwmon_temp_type:
 426         case hwmon_temp_max:
 427         case hwmon_temp_crit:
 428         case hwmon_temp_offset:
 429                 return S_IRUGO | S_IWUSR;
 430         case hwmon_temp_crit_hyst:
 431                 return (channel == 0) ? S_IRUGO | S_IWUSR : S_IRUGO;
 432         default:
 433                 return 0;
 434         }
 435 }
 436
 437 static umode_t lm95245_is_visible(const void *data,
 438                                   enum hwmon_sensor_types type,
 439                                   u32 attr, int channel)
 440 {
 441         switch (type) {
 442         case hwmon_chip:
 443                 switch (attr) {
 444                 case hwmon_chip_update_interval:
 445                         return S_IRUGO | S_IWUSR;
 446                 default:
 447                         return 0;
 448                 }
 449         case hwmon_temp:
 450                 return lm95245_temp_is_visible(data, attr, channel);
 451         default:
 452                 return 0;
 453         }
 454 }
 455
 456 /* Return 0 if detection is successful, -ENODEV otherwise */
 457 static int lm95245_detect(struct i2c_client *new_client,
 458                           struct i2c_board_info *info)
 459 {
 460         struct i2c_adapter *adapter = new_client->adapter;
 461         int address = new_client->addr;
 462         const char *name;
 463         int rev, id;
 464
 465         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 466                 return -ENODEV;
 467
 468         id = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID);
 469         if (id != MANUFACTURER_ID)
 470                 return -ENODEV;
 471
 472         rev = i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID);
 473         switch (rev) {
 474         case LM95235_REVISION:
 475                 if (address != 0x18 && address != 0x29 && address != 0x4c)
 476                         return -ENODEV;
 477                 name = "lm95235";
 478                 break;
 479         case LM95245_REVISION:
 480                 name = "lm95245";
 481                 break;
 482         default:
 483                 return -ENODEV;
 484         }
 485
 486         strlcpy(info->type, name, I2C_NAME_SIZE);
 487         return 0;
 488 }
 489
 490 static int lm95245_init_client(struct lm95245_data *data)
 491 {
 492         int ret;
 493
 494         ret = lm95245_read_conversion_rate(data);
 495         if (ret < 0)
 496                 return ret;
 497
 498         return regmap_update_bits(data->regmap, LM95245_REG_RW_CONFIG1,
 499                                   CFG_STOP, 0);
 500 }
 501
 502 static bool lm95245_is_writeable_reg(struct device *dev, unsigned int reg)
 503 {
 504         switch (reg) {
 505         case LM95245_REG_RW_CONFIG1:
 506         case LM95245_REG_RW_CONVERS_RATE:
 507         case LM95245_REG_W_ONE_SHOT:
 508         case LM95245_REG_RW_CONFIG2:
 509         case LM95245_REG_RW_REMOTE_OFFH:
 510         case LM95245_REG_RW_REMOTE_OFFL:
 511         case LM95245_REG_RW_REMOTE_OS_LIMIT:
 512         case LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT:
 513         case LM95245_REG_RW_REMOTE_TCRIT_LIMIT:
 514         case LM95245_REG_RW_COMMON_HYSTERESIS:
 515                 return true;
 516         default:
 517                 return false;
 518         }
 519 }
 520
 521 static bool lm95245_is_volatile_reg(struct device *dev, unsigned int reg)
 522 {
 523         switch (reg) {
 524         case LM95245_REG_R_STATUS1:
 525         case LM95245_REG_R_STATUS2:
 526         case LM95245_REG_R_LOCAL_TEMPH_S:
 527         case LM95245_REG_R_LOCAL_TEMPL_S:
 528         case LM95245_REG_R_REMOTE_TEMPH_S:
 529         case LM95245_REG_R_REMOTE_TEMPL_S:
 530         case LM95245_REG_R_REMOTE_TEMPH_U:
 531         case LM95245_REG_R_REMOTE_TEMPL_U:
 532                 return true;
 533         default:
 534                 return false;
 535         }
 536 }
 537
 538 static const struct regmap_config lm95245_regmap_config = {
 539         .reg_bits = 8,
 540         .val_bits = 8,
 541         .writeable_reg = lm95245_is_writeable_reg,
 542         .volatile_reg = lm95245_is_volatile_reg,
 543         .cache_type = REGCACHE_RBTREE,
 544         .use_single_read = true,
 545         .use_single_write = true,
 546 };
 547
 548 static const u32 lm95245_chip_config[] = {
 549         HWMON_C_UPDATE_INTERVAL,
 550         0
 551 };
 552
 553 static const struct hwmon_channel_info lm95245_chip = {
 554         .type = hwmon_chip,
 555         .config = lm95245_chip_config,
 556 };
 557
 558 static const u32 lm95245_temp_config[] = {
 559         HWMON_T_INPUT | HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_CRIT_ALARM,
 560         HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT |
 561                 HWMON_T_CRIT_HYST | HWMON_T_FAULT | HWMON_T_MAX_ALARM |
 562                 HWMON_T_CRIT_ALARM | HWMON_T_TYPE | HWMON_T_OFFSET,
 563         0
 564 };
 565
 566 static const struct hwmon_channel_info lm95245_temp = {
 567         .type = hwmon_temp,
 568         .config = lm95245_temp_config,
 569 };
 570
 571 static const struct hwmon_channel_info *lm95245_info[] = {
 572         &lm95245_chip,
 573         &lm95245_temp,
 574         NULL
 575 };
 576
 577 static const struct hwmon_ops lm95245_hwmon_ops = {
 578         .is_visible = lm95245_is_visible,
 579         .read = lm95245_read,
 580         .write = lm95245_write,
 581 };
 582
 583 static const struct hwmon_chip_info lm95245_chip_info = {
 584         .ops = &lm95245_hwmon_ops,
 585         .info = lm95245_info,
 586 };
 587
 588 static int lm95245_probe(struct i2c_client *client,
 589                          const struct i2c_device_id *id)
 590 {
 591         struct device *dev = &client->dev;
 592         struct lm95245_data *data;
 593         struct device *hwmon_dev;
 594         int ret;
 595
 596         data = devm_kzalloc(dev, sizeof(struct lm95245_data), GFP_KERNEL);
 597         if (!data)
 598                 return -ENOMEM;
 599
 600         data->regmap = devm_regmap_init_i2c(client, &lm95245_regmap_config);
 601         if (IS_ERR(data->regmap))
 602                 return PTR_ERR(data->regmap);
 603
 604         mutex_init(&data->update_lock);
 605
 606         /* Initialize the LM95245 chip */
 607         ret = lm95245_init_client(data);
 608         if (ret < 0)
 609                 return ret;
 610
 611         hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
 612                                                          data,
 613                                                          &lm95245_chip_info,
 614                                                          NULL);
 615         return PTR_ERR_OR_ZERO(hwmon_dev);
 616 }
 617
 618 /* Driver data (common to all clients) */
 619 static const struct i2c_device_id lm95245_id[] = {
 620         { "lm95235", 0 },
 621         { "lm95245", 0 },
 622         { }
 623 };
 624 MODULE_DEVICE_TABLE(i2c, lm95245_id);
 625
 626 static const struct of_device_id lm95245_of_match[] = {
 627         { .compatible = "national,lm95235" },
 628         { .compatible = "national,lm95245" },
 629         { },
 630 };
 631 MODULE_DEVICE_TABLE(of, lm95245_of_match);
 632
 633 static struct i2c_driver lm95245_driver = {
 634         .class          = I2C_CLASS_HWMON,
 635         .driver = {
 636                 .name   = "lm95245",
 637                 .of_match_table = of_match_ptr(lm95245_of_match),
 638         },
 639         .probe          = lm95245_probe,
 640         .id_table       = lm95245_id,
 641         .detect         = lm95245_detect,
 642         .address_list   = normal_i2c,
 643 };
 644
 645 module_i2c_driver(lm95245_driver);
 646
 647 MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
 648 MODULE_DESCRIPTION("LM95235/LM95245 sensor driver");
 649 MODULE_LICENSE("GPL");