drivers/hwmon/pmbus/ltc2978.c

   1 /*
   2  * Hardware monitoring driver for LTC2978 and compatible chips.
   3  *
   4  * Copyright (c) 2011 Ericsson AB.
   5  * Copyright (c) 2013, 2014, 2015 Guenter Roeck
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/err.h>
  22 #include <linux/slab.h>
  23 #include <linux/i2c.h>
  24 #include <linux/regulator/driver.h>
  25 #include "pmbus.h"
  26
  27 enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883,
  28              ltc3887, ltm4676 };
  29
  30 /* Common for all chips */
  31 #define LTC2978_MFR_VOUT_PEAK           0xdd
  32 #define LTC2978_MFR_VIN_PEAK            0xde
  33 #define LTC2978_MFR_TEMPERATURE_PEAK    0xdf
  34 #define LTC2978_MFR_SPECIAL_ID          0xe7    /* Not on LTC3882 */
  35
  36 /* LTC2974, LTC2975, LCT2977, and LTC2978 */
  37 #define LTC2978_MFR_VOUT_MIN            0xfb
  38 #define LTC2978_MFR_VIN_MIN             0xfc
  39 #define LTC2978_MFR_TEMPERATURE_MIN     0xfd
  40
  41 /* LTC2974, LTC2975 */
  42 #define LTC2974_MFR_IOUT_PEAK           0xd7
  43 #define LTC2974_MFR_IOUT_MIN            0xd8
  44
  45 /* LTC3880, LTC3882, LTC3883, LTC3887, and LTM4676 */
  46 #define LTC3880_MFR_IOUT_PEAK           0xd7
  47 #define LTC3880_MFR_CLEAR_PEAKS         0xe3
  48 #define LTC3880_MFR_TEMPERATURE2_PEAK   0xf4
  49
  50 /* LTC3883 only */
  51 #define LTC3883_MFR_IIN_PEAK            0xe1
  52
  53 /* LTC2975 only */
  54 #define LTC2975_MFR_IIN_PEAK            0xc4
  55 #define LTC2975_MFR_IIN_MIN             0xc5
  56 #define LTC2975_MFR_PIN_PEAK            0xc6
  57 #define LTC2975_MFR_PIN_MIN             0xc7
  58
  59 #define LTC2978_ID_MASK                 0xfff0
  60
  61 #define LTC2974_ID                      0x0210
  62 #define LTC2975_ID                      0x0220
  63 #define LTC2977_ID                      0x0130
  64 #define LTC2978_ID                      0x0120
  65 #define LTC3880_ID                      0x4020
  66 #define LTC3883_ID                      0x4300
  67 #define LTC3887_ID                      0x4700
  68 #define LTM4676_ID_REV1                 0x4400
  69 #define LTM4676_ID_REV2                 0x4480
  70 #define LTM4676A_ID                     0x47e0
  71
  72 #define LTC2974_NUM_PAGES               4
  73 #define LTC2978_NUM_PAGES               8
  74 #define LTC3880_NUM_PAGES               2
  75 #define LTC3883_NUM_PAGES               1
  76
  77 /*
  78  * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
  79  * happens pretty much each time chip data is updated. Raw peak data therefore
  80  * does not provide much value. To be able to provide useful peak data, keep an
  81  * internal cache of measured peak data, which is only cleared if an explicit
  82  * "clear peak" command is executed for the sensor in question.
  83  */
  84
  85 struct ltc2978_data {
  86         enum chips id;
  87         u16 vin_min, vin_max;
  88         u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
  89         u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
  90         u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
  91         u16 iin_min, iin_max;
  92         u16 pin_min, pin_max;
  93         u16 temp2_max;
  94         struct pmbus_driver_info info;
  95         u32 features;
  96 };
  97 #define to_ltc2978_data(x)  container_of(x, struct ltc2978_data, info)
  98
  99 #define FEAT_CLEAR_PEAKS        BIT(0)
 100
 101 #define has_clear_peaks(d)      ((d)->features & FEAT_CLEAR_PEAKS)
 102
 103 static inline int lin11_to_val(int data)
 104 {
 105         s16 e = ((s16)data) >> 11;
 106         s32 m = (((s16)(data << 5)) >> 5);
 107
 108         /*
 109          * mantissa is 10 bit + sign, exponent adds up to 15 bit.
 110          * Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31).
 111          */
 112         e += 6;
 113         return (e < 0 ? m >> -e : m << e);
 114 }
 115
 116 static int ltc_get_max(struct ltc2978_data *data, struct i2c_client *client,
 117                        int page, int reg, u16 *pmax)
 118 {
 119         int ret;
 120
 121         ret = pmbus_read_word_data(client, page, reg);
 122         if (ret >= 0) {
 123                 if (lin11_to_val(ret) > lin11_to_val(*pmax))
 124                         *pmax = ret;
 125                 ret = *pmax;
 126         }
 127         return ret;
 128 }
 129
 130 static int ltc_get_min(struct ltc2978_data *data, struct i2c_client *client,
 131                        int page, int reg, u16 *pmin)
 132 {
 133         int ret;
 134
 135         ret = pmbus_read_word_data(client, page, reg);
 136         if (ret >= 0) {
 137                 if (lin11_to_val(ret) < lin11_to_val(*pmin))
 138                         *pmin = ret;
 139                 ret = *pmin;
 140         }
 141         return ret;
 142 }
 143
 144 static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
 145                                          int reg)
 146 {
 147         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 148         struct ltc2978_data *data = to_ltc2978_data(info);
 149         int ret;
 150
 151         switch (reg) {
 152         case PMBUS_VIRT_READ_VIN_MAX:
 153                 ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK,
 154                                   &data->vin_max);
 155                 break;
 156         case PMBUS_VIRT_READ_VOUT_MAX:
 157                 ret = pmbus_read_word_data(client, page, LTC2978_MFR_VOUT_PEAK);
 158                 if (ret >= 0) {
 159                         /*
 160                          * VOUT is 16 bit unsigned with fixed exponent,
 161                          * so we can compare it directly
 162                          */
 163                         if (ret > data->vout_max[page])
 164                                 data->vout_max[page] = ret;
 165                         ret = data->vout_max[page];
 166                 }
 167                 break;
 168         case PMBUS_VIRT_READ_TEMP_MAX:
 169                 ret = ltc_get_max(data, client, page,
 170                                   LTC2978_MFR_TEMPERATURE_PEAK,
 171                                   &data->temp_max[page]);
 172                 break;
 173         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 174         case PMBUS_VIRT_RESET_VIN_HISTORY:
 175         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 176                 ret = 0;
 177                 break;
 178         default:
 179                 ret = -ENODATA;
 180                 break;
 181         }
 182         return ret;
 183 }
 184
 185 static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
 186 {
 187         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 188         struct ltc2978_data *data = to_ltc2978_data(info);
 189         int ret;
 190
 191         switch (reg) {
 192         case PMBUS_VIRT_READ_VIN_MIN:
 193                 ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN,
 194                                   &data->vin_min);
 195                 break;
 196         case PMBUS_VIRT_READ_VOUT_MIN:
 197                 ret = pmbus_read_word_data(client, page, LTC2978_MFR_VOUT_MIN);
 198                 if (ret >= 0) {
 199                         /*
 200                          * VOUT_MIN is known to not be supported on some lots
 201                          * of LTC2978 revision 1, and will return the maximum
 202                          * possible voltage if read. If VOUT_MAX is valid and
 203                          * lower than the reading of VOUT_MIN, use it instead.
 204                          */
 205                         if (data->vout_max[page] && ret > data->vout_max[page])
 206                                 ret = data->vout_max[page];
 207                         if (ret < data->vout_min[page])
 208                                 data->vout_min[page] = ret;
 209                         ret = data->vout_min[page];
 210                 }
 211                 break;
 212         case PMBUS_VIRT_READ_TEMP_MIN:
 213                 ret = ltc_get_min(data, client, page,
 214                                   LTC2978_MFR_TEMPERATURE_MIN,
 215                                   &data->temp_min[page]);
 216                 break;
 217         case PMBUS_VIRT_READ_IOUT_MAX:
 218         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 219         case PMBUS_VIRT_READ_TEMP2_MAX:
 220         case PMBUS_VIRT_RESET_TEMP2_HISTORY:
 221                 ret = -ENXIO;
 222                 break;
 223         default:
 224                 ret = ltc2978_read_word_data_common(client, page, reg);
 225                 break;
 226         }
 227         return ret;
 228 }
 229
 230 static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg)
 231 {
 232         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 233         struct ltc2978_data *data = to_ltc2978_data(info);
 234         int ret;
 235
 236         switch (reg) {
 237         case PMBUS_VIRT_READ_IOUT_MAX:
 238                 ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK,
 239                                   &data->iout_max[page]);
 240                 break;
 241         case PMBUS_VIRT_READ_IOUT_MIN:
 242                 ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN,
 243                                   &data->iout_min[page]);
 244                 break;
 245         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 246                 ret = 0;
 247                 break;
 248         default:
 249                 ret = ltc2978_read_word_data(client, page, reg);
 250                 break;
 251         }
 252         return ret;
 253 }
 254
 255 static int ltc2975_read_word_data(struct i2c_client *client, int page, int reg)
 256 {
 257         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 258         struct ltc2978_data *data = to_ltc2978_data(info);
 259         int ret;
 260
 261         switch (reg) {
 262         case PMBUS_VIRT_READ_IIN_MAX:
 263                 ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK,
 264                                   &data->iin_max);
 265                 break;
 266         case PMBUS_VIRT_READ_IIN_MIN:
 267                 ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN,
 268                                   &data->iin_min);
 269                 break;
 270         case PMBUS_VIRT_READ_PIN_MAX:
 271                 ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK,
 272                                   &data->pin_max);
 273                 break;
 274         case PMBUS_VIRT_READ_PIN_MIN:
 275                 ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN,
 276                                   &data->pin_min);
 277                 break;
 278         case PMBUS_VIRT_RESET_IIN_HISTORY:
 279         case PMBUS_VIRT_RESET_PIN_HISTORY:
 280                 ret = 0;
 281                 break;
 282         default:
 283                 ret = ltc2978_read_word_data(client, page, reg);
 284                 break;
 285         }
 286         return ret;
 287 }
 288
 289 static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
 290 {
 291         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 292         struct ltc2978_data *data = to_ltc2978_data(info);
 293         int ret;
 294
 295         switch (reg) {
 296         case PMBUS_VIRT_READ_IOUT_MAX:
 297                 ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK,
 298                                   &data->iout_max[page]);
 299                 break;
 300         case PMBUS_VIRT_READ_TEMP2_MAX:
 301                 ret = ltc_get_max(data, client, page,
 302                                   LTC3880_MFR_TEMPERATURE2_PEAK,
 303                                   &data->temp2_max);
 304                 break;
 305         case PMBUS_VIRT_READ_VIN_MIN:
 306         case PMBUS_VIRT_READ_VOUT_MIN:
 307         case PMBUS_VIRT_READ_TEMP_MIN:
 308                 ret = -ENXIO;
 309                 break;
 310         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 311         case PMBUS_VIRT_RESET_TEMP2_HISTORY:
 312                 ret = 0;
 313                 break;
 314         default:
 315                 ret = ltc2978_read_word_data_common(client, page, reg);
 316                 break;
 317         }
 318         return ret;
 319 }
 320
 321 static int ltc3883_read_word_data(struct i2c_client *client, int page, int reg)
 322 {
 323         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 324         struct ltc2978_data *data = to_ltc2978_data(info);
 325         int ret;
 326
 327         switch (reg) {
 328         case PMBUS_VIRT_READ_IIN_MAX:
 329                 ret = ltc_get_max(data, client, page, LTC3883_MFR_IIN_PEAK,
 330                                   &data->iin_max);
 331                 break;
 332         case PMBUS_VIRT_RESET_IIN_HISTORY:
 333                 ret = 0;
 334                 break;
 335         default:
 336                 ret = ltc3880_read_word_data(client, page, reg);
 337                 break;
 338         }
 339         return ret;
 340 }
 341
 342 static int ltc2978_clear_peaks(struct ltc2978_data *data,
 343                                struct i2c_client *client, int page)
 344 {
 345         int ret;
 346
 347         if (has_clear_peaks(data))
 348                 ret = pmbus_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
 349         else
 350                 ret = pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
 351
 352         return ret;
 353 }
 354
 355 static int ltc2978_write_word_data(struct i2c_client *client, int page,
 356                                     int reg, u16 word)
 357 {
 358         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 359         struct ltc2978_data *data = to_ltc2978_data(info);
 360         int ret;
 361
 362         switch (reg) {
 363         case PMBUS_VIRT_RESET_IIN_HISTORY:
 364                 data->iin_max = 0x7c00;
 365                 data->iin_min = 0x7bff;
 366                 ret = ltc2978_clear_peaks(data, client, 0);
 367                 break;
 368         case PMBUS_VIRT_RESET_PIN_HISTORY:
 369                 data->pin_max = 0x7c00;
 370                 data->pin_min = 0x7bff;
 371                 ret = ltc2978_clear_peaks(data, client, 0);
 372                 break;
 373         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 374                 data->iout_max[page] = 0x7c00;
 375                 data->iout_min[page] = 0xfbff;
 376                 ret = ltc2978_clear_peaks(data, client, page);
 377                 break;
 378         case PMBUS_VIRT_RESET_TEMP2_HISTORY:
 379                 data->temp2_max = 0x7c00;
 380                 ret = ltc2978_clear_peaks(data, client, page);
 381                 break;
 382         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 383                 data->vout_min[page] = 0xffff;
 384                 data->vout_max[page] = 0;
 385                 ret = ltc2978_clear_peaks(data, client, page);
 386                 break;
 387         case PMBUS_VIRT_RESET_VIN_HISTORY:
 388                 data->vin_min = 0x7bff;
 389                 data->vin_max = 0x7c00;
 390                 ret = ltc2978_clear_peaks(data, client, page);
 391                 break;
 392         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 393                 data->temp_min[page] = 0x7bff;
 394                 data->temp_max[page] = 0x7c00;
 395                 ret = ltc2978_clear_peaks(data, client, page);
 396                 break;
 397         default:
 398                 ret = -ENODATA;
 399                 break;
 400         }
 401         return ret;
 402 }
 403
 404 static const struct i2c_device_id ltc2978_id[] = {
 405         {"ltc2974", ltc2974},
 406         {"ltc2975", ltc2975},
 407         {"ltc2977", ltc2977},
 408         {"ltc2978", ltc2978},
 409         {"ltc3880", ltc3880},
 410         {"ltc3882", ltc3882},
 411         {"ltc3883", ltc3883},
 412         {"ltc3887", ltc3887},
 413         {"ltm4676", ltm4676},
 414         {}
 415 };
 416 MODULE_DEVICE_TABLE(i2c, ltc2978_id);
 417
 418 #if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
 419 static const struct regulator_desc ltc2978_reg_desc[] = {
 420         PMBUS_REGULATOR("vout", 0),
 421         PMBUS_REGULATOR("vout", 1),
 422         PMBUS_REGULATOR("vout", 2),
 423         PMBUS_REGULATOR("vout", 3),
 424         PMBUS_REGULATOR("vout", 4),
 425         PMBUS_REGULATOR("vout", 5),
 426         PMBUS_REGULATOR("vout", 6),
 427         PMBUS_REGULATOR("vout", 7),
 428 };
 429 #endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
 430
 431 static int ltc2978_get_id(struct i2c_client *client)
 432 {
 433         int chip_id;
 434
 435         chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
 436         if (chip_id < 0) {
 437                 const struct i2c_device_id *id;
 438                 u8 buf[I2C_SMBUS_BLOCK_MAX];
 439                 int ret;
 440
 441                 if (!i2c_check_functionality(client->adapter,
 442                                              I2C_FUNC_SMBUS_READ_BLOCK_DATA))
 443                         return -ENODEV;
 444
 445                 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
 446                 if (ret < 0)
 447                         return ret;
 448                 if (ret < 3 || strncmp(buf, "LTC", 3))
 449                         return -ENODEV;
 450
 451                 ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
 452                 if (ret < 0)
 453                         return ret;
 454                 for (id = &ltc2978_id[0]; strlen(id->name); id++) {
 455                         if (!strncasecmp(id->name, buf, strlen(id->name)))
 456                                 return (int)id->driver_data;
 457                 }
 458                 return -ENODEV;
 459         }
 460
 461         chip_id &= LTC2978_ID_MASK;
 462
 463         if (chip_id == LTC2974_ID)
 464                 return ltc2974;
 465         else if (chip_id == LTC2975_ID)
 466                 return ltc2975;
 467         else if (chip_id == LTC2977_ID)
 468                 return ltc2977;
 469         else if (chip_id == LTC2978_ID)
 470                 return ltc2978;
 471         else if (chip_id == LTC3880_ID)
 472                 return ltc3880;
 473         else if (chip_id == LTC3883_ID)
 474                 return ltc3883;
 475         else if (chip_id == LTC3887_ID)
 476                 return ltc3887;
 477         else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 ||
 478                  chip_id == LTM4676A_ID)
 479                 return ltm4676;
 480
 481         dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
 482         return -ENODEV;
 483 }
 484
 485 static int ltc2978_probe(struct i2c_client *client,
 486                          const struct i2c_device_id *id)
 487 {
 488         int i, chip_id;
 489         struct ltc2978_data *data;
 490         struct pmbus_driver_info *info;
 491
 492         if (!i2c_check_functionality(client->adapter,
 493                                      I2C_FUNC_SMBUS_READ_WORD_DATA))
 494                 return -ENODEV;
 495
 496         data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data),
 497                             GFP_KERNEL);
 498         if (!data)
 499                 return -ENOMEM;
 500
 501         chip_id = ltc2978_get_id(client);
 502         if (chip_id < 0)
 503                 return chip_id;
 504
 505         data->id = chip_id;
 506         if (data->id != id->driver_data)
 507                 dev_warn(&client->dev,
 508                          "Device mismatch: Configured %s, detected %s\n",
 509                          id->name,
 510                          ltc2978_id[data->id].name);
 511
 512         info = &data->info;
 513         info->write_word_data = ltc2978_write_word_data;
 514
 515         data->vin_min = 0x7bff;
 516         data->vin_max = 0x7c00;
 517         for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
 518                 data->vout_min[i] = 0xffff;
 519         for (i = 0; i < ARRAY_SIZE(data->iout_min); i++)
 520                 data->iout_min[i] = 0xfbff;
 521         for (i = 0; i < ARRAY_SIZE(data->iout_max); i++)
 522                 data->iout_max[i] = 0x7c00;
 523         for (i = 0; i < ARRAY_SIZE(data->temp_min); i++)
 524                 data->temp_min[i] = 0x7bff;
 525         for (i = 0; i < ARRAY_SIZE(data->temp_max); i++)
 526                 data->temp_max[i] = 0x7c00;
 527         data->temp2_max = 0x7c00;
 528
 529         switch (data->id) {
 530         case ltc2974:
 531                 info->read_word_data = ltc2974_read_word_data;
 532                 info->pages = LTC2974_NUM_PAGES;
 533                 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
 534                   | PMBUS_HAVE_TEMP2;
 535                 for (i = 0; i < info->pages; i++) {
 536                         info->func[i] |= PMBUS_HAVE_VOUT
 537                           | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
 538                           | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
 539                           | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
 540                 }
 541                 break;
 542         case ltc2975:
 543                 info->read_word_data = ltc2975_read_word_data;
 544                 info->pages = LTC2974_NUM_PAGES;
 545                 info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
 546                   | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
 547                   | PMBUS_HAVE_TEMP2;
 548                 for (i = 0; i < info->pages; i++) {
 549                         info->func[i] |= PMBUS_HAVE_VOUT
 550                           | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
 551                           | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
 552                           | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
 553                 }
 554                 break;
 555         case ltc2977:
 556         case ltc2978:
 557                 info->read_word_data = ltc2978_read_word_data;
 558                 info->pages = LTC2978_NUM_PAGES;
 559                 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
 560                   | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 561                   | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 562                 for (i = 1; i < LTC2978_NUM_PAGES; i++) {
 563                         info->func[i] = PMBUS_HAVE_VOUT
 564                           | PMBUS_HAVE_STATUS_VOUT;
 565                 }
 566                 break;
 567         case ltc3880:
 568         case ltc3887:
 569         case ltm4676:
 570                 data->features |= FEAT_CLEAR_PEAKS;
 571                 info->read_word_data = ltc3880_read_word_data;
 572                 info->pages = LTC3880_NUM_PAGES;
 573                 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
 574                   | PMBUS_HAVE_STATUS_INPUT
 575                   | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 576                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 577                   | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
 578                   | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
 579                 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 580                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 581                   | PMBUS_HAVE_POUT
 582                   | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 583                 break;
 584         case ltc3882:
 585                 data->features |= FEAT_CLEAR_PEAKS;
 586                 info->read_word_data = ltc3880_read_word_data;
 587                 info->pages = LTC3880_NUM_PAGES;
 588                 info->func[0] = PMBUS_HAVE_VIN
 589                   | PMBUS_HAVE_STATUS_INPUT
 590                   | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 591                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 592                   | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
 593                   | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
 594                 info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 595                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 596                   | PMBUS_HAVE_POUT
 597                   | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 598                 break;
 599         case ltc3883:
 600                 data->features |= FEAT_CLEAR_PEAKS;
 601                 info->read_word_data = ltc3883_read_word_data;
 602                 info->pages = LTC3883_NUM_PAGES;
 603                 info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
 604                   | PMBUS_HAVE_STATUS_INPUT
 605                   | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 606                   | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 607                   | PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
 608                   | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
 609                 break;
 610         default:
 611                 return -ENODEV;
 612         }
 613
 614 #if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
 615         info->num_regulators = info->pages;
 616         info->reg_desc = ltc2978_reg_desc;
 617         if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
 618                 dev_err(&client->dev, "num_regulators too large!");
 619                 info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
 620         }
 621 #endif
 622
 623         return pmbus_do_probe(client, id, info);
 624 }
 625
 626 #ifdef CONFIG_OF
 627 static const struct of_device_id ltc2978_of_match[] = {
 628         { .compatible = "lltc,ltc2974" },
 629         { .compatible = "lltc,ltc2975" },
 630         { .compatible = "lltc,ltc2977" },
 631         { .compatible = "lltc,ltc2978" },
 632         { .compatible = "lltc,ltc3880" },
 633         { .compatible = "lltc,ltc3882" },
 634         { .compatible = "lltc,ltc3883" },
 635         { .compatible = "lltc,ltc3887" },
 636         { .compatible = "lltc,ltm4676" },
 637         { }
 638 };
 639 MODULE_DEVICE_TABLE(of, ltc2978_of_match);
 640 #endif
 641
 642 static struct i2c_driver ltc2978_driver = {
 643         .driver = {
 644                    .name = "ltc2978",
 645                    .of_match_table = of_match_ptr(ltc2978_of_match),
 646                    },
 647         .probe = ltc2978_probe,
 648         .remove = pmbus_do_remove,
 649         .id_table = ltc2978_id,
 650 };
 651
 652 module_i2c_driver(ltc2978_driver);
 653
 654 MODULE_AUTHOR("Guenter Roeck");
 655 MODULE_DESCRIPTION("PMBus driver for LTC2978 and comppatible chips");
 656 MODULE_LICENSE("GPL");