drivers/hwmon/pmbus/adm1275.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Hardware monitoring driver for Analog Devices ADM1275 Hot-Swap Controller
   4  * and Digital Power Monitor
   5  *
   6  * Copyright (c) 2011 Ericsson AB.
   7  * Copyright (c) 2018 Guenter Roeck
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/err.h>
  14 #include <linux/slab.h>
  15 #include <linux/i2c.h>
  16 #include <linux/bitops.h>
  17 #include <linux/bitfield.h>
  18 #include <linux/log2.h>
  19 #include "pmbus.h"
  20
  21 enum chips { adm1075, adm1272, adm1275, adm1276, adm1278, adm1293, adm1294 };
  22
  23 #define ADM1275_MFR_STATUS_IOUT_WARN2   BIT(0)
  24 #define ADM1293_MFR_STATUS_VAUX_UV_WARN BIT(5)
  25 #define ADM1293_MFR_STATUS_VAUX_OV_WARN BIT(6)
  26
  27 #define ADM1275_PEAK_IOUT               0xd0
  28 #define ADM1275_PEAK_VIN                0xd1
  29 #define ADM1275_PEAK_VOUT               0xd2
  30 #define ADM1275_PMON_CONFIG             0xd4
  31
  32 #define ADM1275_VIN_VOUT_SELECT         BIT(6)
  33 #define ADM1275_VRANGE                  BIT(5)
  34 #define ADM1075_IRANGE_50               BIT(4)
  35 #define ADM1075_IRANGE_25               BIT(3)
  36 #define ADM1075_IRANGE_MASK             (BIT(3) | BIT(4))
  37
  38 #define ADM1272_IRANGE                  BIT(0)
  39
  40 #define ADM1278_TEMP1_EN                BIT(3)
  41 #define ADM1278_VIN_EN                  BIT(2)
  42 #define ADM1278_VOUT_EN                 BIT(1)
  43
  44 #define ADM1293_IRANGE_25               0
  45 #define ADM1293_IRANGE_50               BIT(6)
  46 #define ADM1293_IRANGE_100              BIT(7)
  47 #define ADM1293_IRANGE_200              (BIT(6) | BIT(7))
  48 #define ADM1293_IRANGE_MASK             (BIT(6) | BIT(7))
  49
  50 #define ADM1293_VIN_SEL_012             BIT(2)
  51 #define ADM1293_VIN_SEL_074             BIT(3)
  52 #define ADM1293_VIN_SEL_210             (BIT(2) | BIT(3))
  53 #define ADM1293_VIN_SEL_MASK            (BIT(2) | BIT(3))
  54
  55 #define ADM1293_VAUX_EN                 BIT(1)
  56
  57 #define ADM1278_PEAK_TEMP               0xd7
  58 #define ADM1275_IOUT_WARN2_LIMIT        0xd7
  59 #define ADM1275_DEVICE_CONFIG           0xd8
  60
  61 #define ADM1275_IOUT_WARN2_SELECT       BIT(4)
  62
  63 #define ADM1276_PEAK_PIN                0xda
  64 #define ADM1075_READ_VAUX               0xdd
  65 #define ADM1075_VAUX_OV_WARN_LIMIT      0xde
  66 #define ADM1075_VAUX_UV_WARN_LIMIT      0xdf
  67 #define ADM1293_IOUT_MIN                0xe3
  68 #define ADM1293_PIN_MIN                 0xe4
  69 #define ADM1075_VAUX_STATUS             0xf6
  70
  71 #define ADM1075_VAUX_OV_WARN            BIT(7)
  72 #define ADM1075_VAUX_UV_WARN            BIT(6)
  73
  74 #define ADM1275_VI_AVG_SHIFT            0
  75 #define ADM1275_VI_AVG_MASK             GENMASK(ADM1275_VI_AVG_SHIFT + 2, \
  76                                                 ADM1275_VI_AVG_SHIFT)
  77 #define ADM1275_SAMPLES_AVG_MAX         128
  78
  79 #define ADM1278_PWR_AVG_SHIFT           11
  80 #define ADM1278_PWR_AVG_MASK            GENMASK(ADM1278_PWR_AVG_SHIFT + 2, \
  81                                                 ADM1278_PWR_AVG_SHIFT)
  82 #define ADM1278_VI_AVG_SHIFT            8
  83 #define ADM1278_VI_AVG_MASK             GENMASK(ADM1278_VI_AVG_SHIFT + 2, \
  84                                                 ADM1278_VI_AVG_SHIFT)
  85
  86 struct adm1275_data {
  87         int id;
  88         bool have_oc_fault;
  89         bool have_uc_fault;
  90         bool have_vout;
  91         bool have_vaux_status;
  92         bool have_mfr_vaux_status;
  93         bool have_iout_min;
  94         bool have_pin_min;
  95         bool have_pin_max;
  96         bool have_temp_max;
  97         bool have_power_sampling;
  98         struct pmbus_driver_info info;
  99 };
 100
 101 #define to_adm1275_data(x)  container_of(x, struct adm1275_data, info)
 102
 103 struct coefficients {
 104         s16 m;
 105         s16 b;
 106         s16 R;
 107 };
 108
 109 static const struct coefficients adm1075_coefficients[] = {
 110         [0] = { 27169, 0, -1 },         /* voltage */
 111         [1] = { 806, 20475, -1 },       /* current, irange25 */
 112         [2] = { 404, 20475, -1 },       /* current, irange50 */
 113         [3] = { 8549, 0, -1 },          /* power, irange25 */
 114         [4] = { 4279, 0, -1 },          /* power, irange50 */
 115 };
 116
 117 static const struct coefficients adm1272_coefficients[] = {
 118         [0] = { 6770, 0, -2 },          /* voltage, vrange 60V */
 119         [1] = { 4062, 0, -2 },          /* voltage, vrange 100V */
 120         [2] = { 1326, 20480, -1 },      /* current, vsense range 15mV */
 121         [3] = { 663, 20480, -1 },       /* current, vsense range 30mV */
 122         [4] = { 3512, 0, -2 },          /* power, vrange 60V, irange 15mV */
 123         [5] = { 21071, 0, -3 },         /* power, vrange 100V, irange 15mV */
 124         [6] = { 17561, 0, -3 },         /* power, vrange 60V, irange 30mV */
 125         [7] = { 10535, 0, -3 },         /* power, vrange 100V, irange 30mV */
 126         [8] = { 42, 31871, -1 },        /* temperature */
 127
 128 };
 129
 130 static const struct coefficients adm1275_coefficients[] = {
 131         [0] = { 19199, 0, -2 },         /* voltage, vrange set */
 132         [1] = { 6720, 0, -1 },          /* voltage, vrange not set */
 133         [2] = { 807, 20475, -1 },       /* current */
 134 };
 135
 136 static const struct coefficients adm1276_coefficients[] = {
 137         [0] = { 19199, 0, -2 },         /* voltage, vrange set */
 138         [1] = { 6720, 0, -1 },          /* voltage, vrange not set */
 139         [2] = { 807, 20475, -1 },       /* current */
 140         [3] = { 6043, 0, -2 },          /* power, vrange set */
 141         [4] = { 2115, 0, -1 },          /* power, vrange not set */
 142 };
 143
 144 static const struct coefficients adm1278_coefficients[] = {
 145         [0] = { 19599, 0, -2 },         /* voltage */
 146         [1] = { 800, 20475, -1 },       /* current */
 147         [2] = { 6123, 0, -2 },          /* power */
 148         [3] = { 42, 31880, -1 },        /* temperature */
 149 };
 150
 151 static const struct coefficients adm1293_coefficients[] = {
 152         [0] = { 3333, -1, 0 },          /* voltage, vrange 1.2V */
 153         [1] = { 5552, -5, -1 },         /* voltage, vrange 7.4V */
 154         [2] = { 19604, -50, -2 },       /* voltage, vrange 21V */
 155         [3] = { 8000, -100, -2 },       /* current, irange25 */
 156         [4] = { 4000, -100, -2 },       /* current, irange50 */
 157         [5] = { 20000, -1000, -3 },     /* current, irange100 */
 158         [6] = { 10000, -1000, -3 },     /* current, irange200 */
 159         [7] = { 10417, 0, -1 },         /* power, 1.2V, irange25 */
 160         [8] = { 5208, 0, -1 },          /* power, 1.2V, irange50 */
 161         [9] = { 26042, 0, -2 },         /* power, 1.2V, irange100 */
 162         [10] = { 13021, 0, -2 },        /* power, 1.2V, irange200 */
 163         [11] = { 17351, 0, -2 },        /* power, 7.4V, irange25 */
 164         [12] = { 8676, 0, -2 },         /* power, 7.4V, irange50 */
 165         [13] = { 4338, 0, -2 },         /* power, 7.4V, irange100 */
 166         [14] = { 21689, 0, -3 },        /* power, 7.4V, irange200 */
 167         [15] = { 6126, 0, -2 },         /* power, 21V, irange25 */
 168         [16] = { 30631, 0, -3 },        /* power, 21V, irange50 */
 169         [17] = { 15316, 0, -3 },        /* power, 21V, irange100 */
 170         [18] = { 7658, 0, -3 },         /* power, 21V, irange200 */
 171 };
 172
 173 static int adm1275_read_pmon_config(const struct adm1275_data *data,
 174                                     struct i2c_client *client, bool is_power)
 175 {
 176         int shift, ret;
 177         u16 mask;
 178
 179         /*
 180          * The PMON configuration register is a 16-bit register only on chips
 181          * supporting power average sampling. On other chips it is an 8-bit
 182          * register.
 183          */
 184         if (data->have_power_sampling) {
 185                 ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
 186                 mask = is_power ? ADM1278_PWR_AVG_MASK : ADM1278_VI_AVG_MASK;
 187                 shift = is_power ? ADM1278_PWR_AVG_SHIFT : ADM1278_VI_AVG_SHIFT;
 188         } else {
 189                 ret = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
 190                 mask = ADM1275_VI_AVG_MASK;
 191                 shift = ADM1275_VI_AVG_SHIFT;
 192         }
 193         if (ret < 0)
 194                 return ret;
 195
 196         return (ret & mask) >> shift;
 197 }
 198
 199 static int adm1275_write_pmon_config(const struct adm1275_data *data,
 200                                      struct i2c_client *client,
 201                                      bool is_power, u16 word)
 202 {
 203         int shift, ret;
 204         u16 mask;
 205
 206         if (data->have_power_sampling) {
 207                 ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
 208                 mask = is_power ? ADM1278_PWR_AVG_MASK : ADM1278_VI_AVG_MASK;
 209                 shift = is_power ? ADM1278_PWR_AVG_SHIFT : ADM1278_VI_AVG_SHIFT;
 210         } else {
 211                 ret = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
 212                 mask = ADM1275_VI_AVG_MASK;
 213                 shift = ADM1275_VI_AVG_SHIFT;
 214         }
 215         if (ret < 0)
 216                 return ret;
 217
 218         word = (ret & ~mask) | ((word << shift) & mask);
 219         if (data->have_power_sampling)
 220                 ret = i2c_smbus_write_word_data(client, ADM1275_PMON_CONFIG,
 221                                                 word);
 222         else
 223                 ret = i2c_smbus_write_byte_data(client, ADM1275_PMON_CONFIG,
 224                                                 word);
 225
 226         return ret;
 227 }
 228
 229 static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
 230 {
 231         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 232         const struct adm1275_data *data = to_adm1275_data(info);
 233         int ret = 0;
 234
 235         if (page > 0)
 236                 return -ENXIO;
 237
 238         switch (reg) {
 239         case PMBUS_IOUT_UC_FAULT_LIMIT:
 240                 if (!data->have_uc_fault)
 241                         return -ENXIO;
 242                 ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
 243                 break;
 244         case PMBUS_IOUT_OC_FAULT_LIMIT:
 245                 if (!data->have_oc_fault)
 246                         return -ENXIO;
 247                 ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
 248                 break;
 249         case PMBUS_VOUT_OV_WARN_LIMIT:
 250                 if (data->have_vout)
 251                         return -ENODATA;
 252                 ret = pmbus_read_word_data(client, 0,
 253                                            ADM1075_VAUX_OV_WARN_LIMIT);
 254                 break;
 255         case PMBUS_VOUT_UV_WARN_LIMIT:
 256                 if (data->have_vout)
 257                         return -ENODATA;
 258                 ret = pmbus_read_word_data(client, 0,
 259                                            ADM1075_VAUX_UV_WARN_LIMIT);
 260                 break;
 261         case PMBUS_READ_VOUT:
 262                 if (data->have_vout)
 263                         return -ENODATA;
 264                 ret = pmbus_read_word_data(client, 0, ADM1075_READ_VAUX);
 265                 break;
 266         case PMBUS_VIRT_READ_IOUT_MIN:
 267                 if (!data->have_iout_min)
 268                         return -ENXIO;
 269                 ret = pmbus_read_word_data(client, 0, ADM1293_IOUT_MIN);
 270                 break;
 271         case PMBUS_VIRT_READ_IOUT_MAX:
 272                 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
 273                 break;
 274         case PMBUS_VIRT_READ_VOUT_MAX:
 275                 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VOUT);
 276                 break;
 277         case PMBUS_VIRT_READ_VIN_MAX:
 278                 ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_VIN);
 279                 break;
 280         case PMBUS_VIRT_READ_PIN_MIN:
 281                 if (!data->have_pin_min)
 282                         return -ENXIO;
 283                 ret = pmbus_read_word_data(client, 0, ADM1293_PIN_MIN);
 284                 break;
 285         case PMBUS_VIRT_READ_PIN_MAX:
 286                 if (!data->have_pin_max)
 287                         return -ENXIO;
 288                 ret = pmbus_read_word_data(client, 0, ADM1276_PEAK_PIN);
 289                 break;
 290         case PMBUS_VIRT_READ_TEMP_MAX:
 291                 if (!data->have_temp_max)
 292                         return -ENXIO;
 293                 ret = pmbus_read_word_data(client, 0, ADM1278_PEAK_TEMP);
 294                 break;
 295         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 296         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 297         case PMBUS_VIRT_RESET_VIN_HISTORY:
 298                 break;
 299         case PMBUS_VIRT_RESET_PIN_HISTORY:
 300                 if (!data->have_pin_max)
 301                         return -ENXIO;
 302                 break;
 303         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 304                 if (!data->have_temp_max)
 305                         return -ENXIO;
 306                 break;
 307         case PMBUS_VIRT_POWER_SAMPLES:
 308                 if (!data->have_power_sampling)
 309                         return -ENXIO;
 310                 ret = adm1275_read_pmon_config(data, client, true);
 311                 if (ret < 0)
 312                         break;
 313                 ret = BIT(ret);
 314                 break;
 315         case PMBUS_VIRT_IN_SAMPLES:
 316         case PMBUS_VIRT_CURR_SAMPLES:
 317                 ret = adm1275_read_pmon_config(data, client, false);
 318                 if (ret < 0)
 319                         break;
 320                 ret = BIT(ret);
 321                 break;
 322         default:
 323                 ret = -ENODATA;
 324                 break;
 325         }
 326         return ret;
 327 }
 328
 329 static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
 330                                    u16 word)
 331 {
 332         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 333         const struct adm1275_data *data = to_adm1275_data(info);
 334         int ret;
 335
 336         if (page > 0)
 337                 return -ENXIO;
 338
 339         switch (reg) {
 340         case PMBUS_IOUT_UC_FAULT_LIMIT:
 341         case PMBUS_IOUT_OC_FAULT_LIMIT:
 342                 ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
 343                                             word);
 344                 break;
 345         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 346                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
 347                 if (!ret && data->have_iout_min)
 348                         ret = pmbus_write_word_data(client, 0,
 349                                                     ADM1293_IOUT_MIN, 0);
 350                 break;
 351         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 352                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
 353                 break;
 354         case PMBUS_VIRT_RESET_VIN_HISTORY:
 355                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
 356                 break;
 357         case PMBUS_VIRT_RESET_PIN_HISTORY:
 358                 ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
 359                 if (!ret && data->have_pin_min)
 360                         ret = pmbus_write_word_data(client, 0,
 361                                                     ADM1293_PIN_MIN, 0);
 362                 break;
 363         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 364                 ret = pmbus_write_word_data(client, 0, ADM1278_PEAK_TEMP, 0);
 365                 break;
 366         case PMBUS_VIRT_POWER_SAMPLES:
 367                 if (!data->have_power_sampling)
 368                         return -ENXIO;
 369                 word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
 370                 ret = adm1275_write_pmon_config(data, client, true,
 371                                                 ilog2(word));
 372                 break;
 373         case PMBUS_VIRT_IN_SAMPLES:
 374         case PMBUS_VIRT_CURR_SAMPLES:
 375                 word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
 376                 ret = adm1275_write_pmon_config(data, client, false,
 377                                                 ilog2(word));
 378                 break;
 379         default:
 380                 ret = -ENODATA;
 381                 break;
 382         }
 383         return ret;
 384 }
 385
 386 static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
 387 {
 388         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 389         const struct adm1275_data *data = to_adm1275_data(info);
 390         int mfr_status, ret;
 391
 392         if (page > 0)
 393                 return -ENXIO;
 394
 395         switch (reg) {
 396         case PMBUS_STATUS_IOUT:
 397                 ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
 398                 if (ret < 0)
 399                         break;
 400                 if (!data->have_oc_fault && !data->have_uc_fault)
 401                         break;
 402                 mfr_status = pmbus_read_byte_data(client, page,
 403                                                   PMBUS_STATUS_MFR_SPECIFIC);
 404                 if (mfr_status < 0)
 405                         return mfr_status;
 406                 if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
 407                         ret |= data->have_oc_fault ?
 408                           PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
 409                 }
 410                 break;
 411         case PMBUS_STATUS_VOUT:
 412                 if (data->have_vout)
 413                         return -ENODATA;
 414                 ret = 0;
 415                 if (data->have_vaux_status) {
 416                         mfr_status = pmbus_read_byte_data(client, 0,
 417                                                           ADM1075_VAUX_STATUS);
 418                         if (mfr_status < 0)
 419                                 return mfr_status;
 420                         if (mfr_status & ADM1075_VAUX_OV_WARN)
 421                                 ret |= PB_VOLTAGE_OV_WARNING;
 422                         if (mfr_status & ADM1075_VAUX_UV_WARN)
 423                                 ret |= PB_VOLTAGE_UV_WARNING;
 424                 } else if (data->have_mfr_vaux_status) {
 425                         mfr_status = pmbus_read_byte_data(client, page,
 426                                                 PMBUS_STATUS_MFR_SPECIFIC);
 427                         if (mfr_status < 0)
 428                                 return mfr_status;
 429                         if (mfr_status & ADM1293_MFR_STATUS_VAUX_OV_WARN)
 430                                 ret |= PB_VOLTAGE_OV_WARNING;
 431                         if (mfr_status & ADM1293_MFR_STATUS_VAUX_UV_WARN)
 432                                 ret |= PB_VOLTAGE_UV_WARNING;
 433                 }
 434                 break;
 435         default:
 436                 ret = -ENODATA;
 437                 break;
 438         }
 439         return ret;
 440 }
 441
 442 static const struct i2c_device_id adm1275_id[] = {
 443         { "adm1075", adm1075 },
 444         { "adm1272", adm1272 },
 445         { "adm1275", adm1275 },
 446         { "adm1276", adm1276 },
 447         { "adm1278", adm1278 },
 448         { "adm1293", adm1293 },
 449         { "adm1294", adm1294 },
 450         { }
 451 };
 452 MODULE_DEVICE_TABLE(i2c, adm1275_id);
 453
 454 static int adm1275_probe(struct i2c_client *client,
 455                          const struct i2c_device_id *id)
 456 {
 457         u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
 458         int config, device_config;
 459         int ret;
 460         struct pmbus_driver_info *info;
 461         struct adm1275_data *data;
 462         const struct i2c_device_id *mid;
 463         const struct coefficients *coefficients;
 464         int vindex = -1, voindex = -1, cindex = -1, pindex = -1;
 465         int tindex = -1;
 466         u32 shunt;
 467
 468         if (!i2c_check_functionality(client->adapter,
 469                                      I2C_FUNC_SMBUS_READ_BYTE_DATA
 470                                      | I2C_FUNC_SMBUS_BLOCK_DATA))
 471                 return -ENODEV;
 472
 473         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
 474         if (ret < 0) {
 475                 dev_err(&client->dev, "Failed to read Manufacturer ID\n");
 476                 return ret;
 477         }
 478         if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
 479                 dev_err(&client->dev, "Unsupported Manufacturer ID\n");
 480                 return -ENODEV;
 481         }
 482
 483         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
 484         if (ret < 0) {
 485                 dev_err(&client->dev, "Failed to read Manufacturer Model\n");
 486                 return ret;
 487         }
 488         for (mid = adm1275_id; mid->name[0]; mid++) {
 489                 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 490                         break;
 491         }
 492         if (!mid->name[0]) {
 493                 dev_err(&client->dev, "Unsupported device\n");
 494                 return -ENODEV;
 495         }
 496
 497         if (id->driver_data != mid->driver_data)
 498                 dev_notice(&client->dev,
 499                            "Device mismatch: Configured %s, detected %s\n",
 500                            id->name, mid->name);
 501
 502         config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
 503         if (config < 0)
 504                 return config;
 505
 506         device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
 507         if (device_config < 0)
 508                 return device_config;
 509
 510         data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data),
 511                             GFP_KERNEL);
 512         if (!data)
 513                 return -ENOMEM;
 514
 515         if (of_property_read_u32(client->dev.of_node,
 516                                  "shunt-resistor-micro-ohms", &shunt))
 517                 shunt = 1000; /* 1 mOhm if not set via DT */
 518
 519         if (shunt == 0)
 520                 return -EINVAL;
 521
 522         data->id = mid->driver_data;
 523
 524         info = &data->info;
 525
 526         info->pages = 1;
 527         info->format[PSC_VOLTAGE_IN] = direct;
 528         info->format[PSC_VOLTAGE_OUT] = direct;
 529         info->format[PSC_CURRENT_OUT] = direct;
 530         info->format[PSC_POWER] = direct;
 531         info->format[PSC_TEMPERATURE] = direct;
 532         info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 533                         PMBUS_HAVE_SAMPLES;
 534
 535         info->read_word_data = adm1275_read_word_data;
 536         info->read_byte_data = adm1275_read_byte_data;
 537         info->write_word_data = adm1275_write_word_data;
 538
 539         switch (data->id) {
 540         case adm1075:
 541                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 542                         data->have_oc_fault = true;
 543                 else
 544                         data->have_uc_fault = true;
 545                 data->have_pin_max = true;
 546                 data->have_vaux_status = true;
 547
 548                 coefficients = adm1075_coefficients;
 549                 vindex = 0;
 550                 switch (config & ADM1075_IRANGE_MASK) {
 551                 case ADM1075_IRANGE_25:
 552                         cindex = 1;
 553                         pindex = 3;
 554                         break;
 555                 case ADM1075_IRANGE_50:
 556                         cindex = 2;
 557                         pindex = 4;
 558                         break;
 559                 default:
 560                         dev_err(&client->dev, "Invalid input current range");
 561                         break;
 562                 }
 563
 564                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 565                   | PMBUS_HAVE_STATUS_INPUT;
 566                 if (config & ADM1275_VIN_VOUT_SELECT)
 567                         info->func[0] |=
 568                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 569                 break;
 570         case adm1272:
 571                 data->have_vout = true;
 572                 data->have_pin_max = true;
 573                 data->have_temp_max = true;
 574                 data->have_power_sampling = true;
 575
 576                 coefficients = adm1272_coefficients;
 577                 vindex = (config & ADM1275_VRANGE) ? 1 : 0;
 578                 cindex = (config & ADM1272_IRANGE) ? 3 : 2;
 579                 /* pindex depends on the combination of the above */
 580                 switch (config & (ADM1275_VRANGE | ADM1272_IRANGE)) {
 581                 case 0:
 582                 default:
 583                         pindex = 4;
 584                         break;
 585                 case ADM1275_VRANGE:
 586                         pindex = 5;
 587                         break;
 588                 case ADM1272_IRANGE:
 589                         pindex = 6;
 590                         break;
 591                 case ADM1275_VRANGE | ADM1272_IRANGE:
 592                         pindex = 7;
 593                         break;
 594                 }
 595                 tindex = 8;
 596
 597                 info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 598                         PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 599
 600                 /* Enable VOUT if not enabled (it is disabled by default) */
 601                 if (!(config & ADM1278_VOUT_EN)) {
 602                         config |= ADM1278_VOUT_EN;
 603                         ret = i2c_smbus_write_byte_data(client,
 604                                                         ADM1275_PMON_CONFIG,
 605                                                         config);
 606                         if (ret < 0) {
 607                                 dev_err(&client->dev,
 608                                         "Failed to enable VOUT monitoring\n");
 609                                 return -ENODEV;
 610                         }
 611                 }
 612
 613                 if (config & ADM1278_TEMP1_EN)
 614                         info->func[0] |=
 615                                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 616                 if (config & ADM1278_VIN_EN)
 617                         info->func[0] |= PMBUS_HAVE_VIN;
 618                 break;
 619         case adm1275:
 620                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 621                         data->have_oc_fault = true;
 622                 else
 623                         data->have_uc_fault = true;
 624                 data->have_vout = true;
 625
 626                 coefficients = adm1275_coefficients;
 627                 vindex = (config & ADM1275_VRANGE) ? 0 : 1;
 628                 cindex = 2;
 629
 630                 if (config & ADM1275_VIN_VOUT_SELECT)
 631                         info->func[0] |=
 632                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 633                 else
 634                         info->func[0] |=
 635                           PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
 636                 break;
 637         case adm1276:
 638                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 639                         data->have_oc_fault = true;
 640                 else
 641                         data->have_uc_fault = true;
 642                 data->have_vout = true;
 643                 data->have_pin_max = true;
 644
 645                 coefficients = adm1276_coefficients;
 646                 vindex = (config & ADM1275_VRANGE) ? 0 : 1;
 647                 cindex = 2;
 648                 pindex = (config & ADM1275_VRANGE) ? 3 : 4;
 649
 650                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 651                   | PMBUS_HAVE_STATUS_INPUT;
 652                 if (config & ADM1275_VIN_VOUT_SELECT)
 653                         info->func[0] |=
 654                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 655                 break;
 656         case adm1278:
 657                 data->have_vout = true;
 658                 data->have_pin_max = true;
 659                 data->have_temp_max = true;
 660                 data->have_power_sampling = true;
 661
 662                 coefficients = adm1278_coefficients;
 663                 vindex = 0;
 664                 cindex = 1;
 665                 pindex = 2;
 666                 tindex = 3;
 667
 668                 info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 669                         PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 670
 671                 /* Enable VOUT if not enabled (it is disabled by default) */
 672                 if (!(config & ADM1278_VOUT_EN)) {
 673                         config |= ADM1278_VOUT_EN;
 674                         ret = i2c_smbus_write_byte_data(client,
 675                                                         ADM1275_PMON_CONFIG,
 676                                                         config);
 677                         if (ret < 0) {
 678                                 dev_err(&client->dev,
 679                                         "Failed to enable VOUT monitoring\n");
 680                                 return -ENODEV;
 681                         }
 682                 }
 683
 684                 if (config & ADM1278_TEMP1_EN)
 685                         info->func[0] |=
 686                                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 687                 if (config & ADM1278_VIN_EN)
 688                         info->func[0] |= PMBUS_HAVE_VIN;
 689                 break;
 690         case adm1293:
 691         case adm1294:
 692                 data->have_iout_min = true;
 693                 data->have_pin_min = true;
 694                 data->have_pin_max = true;
 695                 data->have_mfr_vaux_status = true;
 696                 data->have_power_sampling = true;
 697
 698                 coefficients = adm1293_coefficients;
 699
 700                 voindex = 0;
 701                 switch (config & ADM1293_VIN_SEL_MASK) {
 702                 case ADM1293_VIN_SEL_012:       /* 1.2V */
 703                         vindex = 0;
 704                         break;
 705                 case ADM1293_VIN_SEL_074:       /* 7.4V */
 706                         vindex = 1;
 707                         break;
 708                 case ADM1293_VIN_SEL_210:       /* 21V */
 709                         vindex = 2;
 710                         break;
 711                 default:                        /* disabled */
 712                         break;
 713                 }
 714
 715                 switch (config & ADM1293_IRANGE_MASK) {
 716                 case ADM1293_IRANGE_25:
 717                         cindex = 3;
 718                         break;
 719                 case ADM1293_IRANGE_50:
 720                         cindex = 4;
 721                         break;
 722                 case ADM1293_IRANGE_100:
 723                         cindex = 5;
 724                         break;
 725                 case ADM1293_IRANGE_200:
 726                         cindex = 6;
 727                         break;
 728                 }
 729
 730                 if (vindex >= 0)
 731                         pindex = 7 + vindex * 4 + (cindex - 3);
 732
 733                 if (config & ADM1293_VAUX_EN)
 734                         info->func[0] |=
 735                                 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 736
 737                 info->func[0] |= PMBUS_HAVE_PIN |
 738                         PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
 739
 740                 break;
 741         default:
 742                 dev_err(&client->dev, "Unsupported device\n");
 743                 return -ENODEV;
 744         }
 745
 746         if (voindex < 0)
 747                 voindex = vindex;
 748         if (vindex >= 0) {
 749                 info->m[PSC_VOLTAGE_IN] = coefficients[vindex].m;
 750                 info->b[PSC_VOLTAGE_IN] = coefficients[vindex].b;
 751                 info->R[PSC_VOLTAGE_IN] = coefficients[vindex].R;
 752         }
 753         if (voindex >= 0) {
 754                 info->m[PSC_VOLTAGE_OUT] = coefficients[voindex].m;
 755                 info->b[PSC_VOLTAGE_OUT] = coefficients[voindex].b;
 756                 info->R[PSC_VOLTAGE_OUT] = coefficients[voindex].R;
 757         }
 758         if (cindex >= 0) {
 759                 /* Scale current with sense resistor value */
 760                 info->m[PSC_CURRENT_OUT] =
 761                         coefficients[cindex].m * shunt / 1000;
 762                 info->b[PSC_CURRENT_OUT] = coefficients[cindex].b;
 763                 info->R[PSC_CURRENT_OUT] = coefficients[cindex].R;
 764         }
 765         if (pindex >= 0) {
 766                 info->m[PSC_POWER] =
 767                         coefficients[pindex].m * shunt / 1000;
 768                 info->b[PSC_POWER] = coefficients[pindex].b;
 769                 info->R[PSC_POWER] = coefficients[pindex].R;
 770         }
 771         if (tindex >= 0) {
 772                 info->m[PSC_TEMPERATURE] = coefficients[tindex].m;
 773                 info->b[PSC_TEMPERATURE] = coefficients[tindex].b;
 774                 info->R[PSC_TEMPERATURE] = coefficients[tindex].R;
 775         }
 776
 777         return pmbus_do_probe(client, id, info);
 778 }
 779
 780 static struct i2c_driver adm1275_driver = {
 781         .driver = {
 782                    .name = "adm1275",
 783                    },
 784         .probe = adm1275_probe,
 785         .remove = pmbus_do_remove,
 786         .id_table = adm1275_id,
 787 };
 788
 789 module_i2c_driver(adm1275_driver);
 790
 791 MODULE_AUTHOR("Guenter Roeck");
 792 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
 793 MODULE_LICENSE("GPL");