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,
 230                                   int phase, int reg)
 231 {
 232         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 233         const struct adm1275_data *data = to_adm1275_data(info);
 234         int ret = 0;
 235
 236         if (page > 0)
 237                 return -ENXIO;
 238
 239         switch (reg) {
 240         case PMBUS_IOUT_UC_FAULT_LIMIT:
 241                 if (!data->have_uc_fault)
 242                         return -ENXIO;
 243                 ret = pmbus_read_word_data(client, 0, 0xff,
 244                                            ADM1275_IOUT_WARN2_LIMIT);
 245                 break;
 246         case PMBUS_IOUT_OC_FAULT_LIMIT:
 247                 if (!data->have_oc_fault)
 248                         return -ENXIO;
 249                 ret = pmbus_read_word_data(client, 0, 0xff,
 250                                            ADM1275_IOUT_WARN2_LIMIT);
 251                 break;
 252         case PMBUS_VOUT_OV_WARN_LIMIT:
 253                 if (data->have_vout)
 254                         return -ENODATA;
 255                 ret = pmbus_read_word_data(client, 0, 0xff,
 256                                            ADM1075_VAUX_OV_WARN_LIMIT);
 257                 break;
 258         case PMBUS_VOUT_UV_WARN_LIMIT:
 259                 if (data->have_vout)
 260                         return -ENODATA;
 261                 ret = pmbus_read_word_data(client, 0, 0xff,
 262                                            ADM1075_VAUX_UV_WARN_LIMIT);
 263                 break;
 264         case PMBUS_READ_VOUT:
 265                 if (data->have_vout)
 266                         return -ENODATA;
 267                 ret = pmbus_read_word_data(client, 0, 0xff,
 268                                            ADM1075_READ_VAUX);
 269                 break;
 270         case PMBUS_VIRT_READ_IOUT_MIN:
 271                 if (!data->have_iout_min)
 272                         return -ENXIO;
 273                 ret = pmbus_read_word_data(client, 0, 0xff,
 274                                            ADM1293_IOUT_MIN);
 275                 break;
 276         case PMBUS_VIRT_READ_IOUT_MAX:
 277                 ret = pmbus_read_word_data(client, 0, 0xff,
 278                                            ADM1275_PEAK_IOUT);
 279                 break;
 280         case PMBUS_VIRT_READ_VOUT_MAX:
 281                 ret = pmbus_read_word_data(client, 0, 0xff,
 282                                            ADM1275_PEAK_VOUT);
 283                 break;
 284         case PMBUS_VIRT_READ_VIN_MAX:
 285                 ret = pmbus_read_word_data(client, 0, 0xff,
 286                                            ADM1275_PEAK_VIN);
 287                 break;
 288         case PMBUS_VIRT_READ_PIN_MIN:
 289                 if (!data->have_pin_min)
 290                         return -ENXIO;
 291                 ret = pmbus_read_word_data(client, 0, 0xff,
 292                                            ADM1293_PIN_MIN);
 293                 break;
 294         case PMBUS_VIRT_READ_PIN_MAX:
 295                 if (!data->have_pin_max)
 296                         return -ENXIO;
 297                 ret = pmbus_read_word_data(client, 0, 0xff,
 298                                            ADM1276_PEAK_PIN);
 299                 break;
 300         case PMBUS_VIRT_READ_TEMP_MAX:
 301                 if (!data->have_temp_max)
 302                         return -ENXIO;
 303                 ret = pmbus_read_word_data(client, 0, 0xff,
 304                                            ADM1278_PEAK_TEMP);
 305                 break;
 306         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 307         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 308         case PMBUS_VIRT_RESET_VIN_HISTORY:
 309                 break;
 310         case PMBUS_VIRT_RESET_PIN_HISTORY:
 311                 if (!data->have_pin_max)
 312                         return -ENXIO;
 313                 break;
 314         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 315                 if (!data->have_temp_max)
 316                         return -ENXIO;
 317                 break;
 318         case PMBUS_VIRT_POWER_SAMPLES:
 319                 if (!data->have_power_sampling)
 320                         return -ENXIO;
 321                 ret = adm1275_read_pmon_config(data, client, true);
 322                 if (ret < 0)
 323                         break;
 324                 ret = BIT(ret);
 325                 break;
 326         case PMBUS_VIRT_IN_SAMPLES:
 327         case PMBUS_VIRT_CURR_SAMPLES:
 328                 ret = adm1275_read_pmon_config(data, client, false);
 329                 if (ret < 0)
 330                         break;
 331                 ret = BIT(ret);
 332                 break;
 333         default:
 334                 ret = -ENODATA;
 335                 break;
 336         }
 337         return ret;
 338 }
 339
 340 static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
 341                                    u16 word)
 342 {
 343         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 344         const struct adm1275_data *data = to_adm1275_data(info);
 345         int ret;
 346
 347         if (page > 0)
 348                 return -ENXIO;
 349
 350         switch (reg) {
 351         case PMBUS_IOUT_UC_FAULT_LIMIT:
 352         case PMBUS_IOUT_OC_FAULT_LIMIT:
 353                 ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
 354                                             word);
 355                 break;
 356         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 357                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
 358                 if (!ret && data->have_iout_min)
 359                         ret = pmbus_write_word_data(client, 0,
 360                                                     ADM1293_IOUT_MIN, 0);
 361                 break;
 362         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 363                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
 364                 break;
 365         case PMBUS_VIRT_RESET_VIN_HISTORY:
 366                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
 367                 break;
 368         case PMBUS_VIRT_RESET_PIN_HISTORY:
 369                 ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
 370                 if (!ret && data->have_pin_min)
 371                         ret = pmbus_write_word_data(client, 0,
 372                                                     ADM1293_PIN_MIN, 0);
 373                 break;
 374         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 375                 ret = pmbus_write_word_data(client, 0, ADM1278_PEAK_TEMP, 0);
 376                 break;
 377         case PMBUS_VIRT_POWER_SAMPLES:
 378                 if (!data->have_power_sampling)
 379                         return -ENXIO;
 380                 word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
 381                 ret = adm1275_write_pmon_config(data, client, true,
 382                                                 ilog2(word));
 383                 break;
 384         case PMBUS_VIRT_IN_SAMPLES:
 385         case PMBUS_VIRT_CURR_SAMPLES:
 386                 word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
 387                 ret = adm1275_write_pmon_config(data, client, false,
 388                                                 ilog2(word));
 389                 break;
 390         default:
 391                 ret = -ENODATA;
 392                 break;
 393         }
 394         return ret;
 395 }
 396
 397 static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
 398 {
 399         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 400         const struct adm1275_data *data = to_adm1275_data(info);
 401         int mfr_status, ret;
 402
 403         if (page > 0)
 404                 return -ENXIO;
 405
 406         switch (reg) {
 407         case PMBUS_STATUS_IOUT:
 408                 ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
 409                 if (ret < 0)
 410                         break;
 411                 if (!data->have_oc_fault && !data->have_uc_fault)
 412                         break;
 413                 mfr_status = pmbus_read_byte_data(client, page,
 414                                                   PMBUS_STATUS_MFR_SPECIFIC);
 415                 if (mfr_status < 0)
 416                         return mfr_status;
 417                 if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
 418                         ret |= data->have_oc_fault ?
 419                           PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
 420                 }
 421                 break;
 422         case PMBUS_STATUS_VOUT:
 423                 if (data->have_vout)
 424                         return -ENODATA;
 425                 ret = 0;
 426                 if (data->have_vaux_status) {
 427                         mfr_status = pmbus_read_byte_data(client, 0,
 428                                                           ADM1075_VAUX_STATUS);
 429                         if (mfr_status < 0)
 430                                 return mfr_status;
 431                         if (mfr_status & ADM1075_VAUX_OV_WARN)
 432                                 ret |= PB_VOLTAGE_OV_WARNING;
 433                         if (mfr_status & ADM1075_VAUX_UV_WARN)
 434                                 ret |= PB_VOLTAGE_UV_WARNING;
 435                 } else if (data->have_mfr_vaux_status) {
 436                         mfr_status = pmbus_read_byte_data(client, page,
 437                                                 PMBUS_STATUS_MFR_SPECIFIC);
 438                         if (mfr_status < 0)
 439                                 return mfr_status;
 440                         if (mfr_status & ADM1293_MFR_STATUS_VAUX_OV_WARN)
 441                                 ret |= PB_VOLTAGE_OV_WARNING;
 442                         if (mfr_status & ADM1293_MFR_STATUS_VAUX_UV_WARN)
 443                                 ret |= PB_VOLTAGE_UV_WARNING;
 444                 }
 445                 break;
 446         default:
 447                 ret = -ENODATA;
 448                 break;
 449         }
 450         return ret;
 451 }
 452
 453 static const struct i2c_device_id adm1275_id[] = {
 454         { "adm1075", adm1075 },
 455         { "adm1272", adm1272 },
 456         { "adm1275", adm1275 },
 457         { "adm1276", adm1276 },
 458         { "adm1278", adm1278 },
 459         { "adm1293", adm1293 },
 460         { "adm1294", adm1294 },
 461         { }
 462 };
 463 MODULE_DEVICE_TABLE(i2c, adm1275_id);
 464
 465 static int adm1275_probe(struct i2c_client *client,
 466                          const struct i2c_device_id *id)
 467 {
 468         s32 (*config_read_fn)(const struct i2c_client *client, u8 reg);
 469         u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
 470         int config, device_config;
 471         int ret;
 472         struct pmbus_driver_info *info;
 473         struct adm1275_data *data;
 474         const struct i2c_device_id *mid;
 475         const struct coefficients *coefficients;
 476         int vindex = -1, voindex = -1, cindex = -1, pindex = -1;
 477         int tindex = -1;
 478         u32 shunt;
 479
 480         if (!i2c_check_functionality(client->adapter,
 481                                      I2C_FUNC_SMBUS_READ_BYTE_DATA
 482                                      | I2C_FUNC_SMBUS_BLOCK_DATA))
 483                 return -ENODEV;
 484
 485         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
 486         if (ret < 0) {
 487                 dev_err(&client->dev, "Failed to read Manufacturer ID\n");
 488                 return ret;
 489         }
 490         if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
 491                 dev_err(&client->dev, "Unsupported Manufacturer ID\n");
 492                 return -ENODEV;
 493         }
 494
 495         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
 496         if (ret < 0) {
 497                 dev_err(&client->dev, "Failed to read Manufacturer Model\n");
 498                 return ret;
 499         }
 500         for (mid = adm1275_id; mid->name[0]; mid++) {
 501                 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 502                         break;
 503         }
 504         if (!mid->name[0]) {
 505                 dev_err(&client->dev, "Unsupported device\n");
 506                 return -ENODEV;
 507         }
 508
 509         if (id->driver_data != mid->driver_data)
 510                 dev_notice(&client->dev,
 511                            "Device mismatch: Configured %s, detected %s\n",
 512                            id->name, mid->name);
 513
 514         if (mid->driver_data == adm1272 || mid->driver_data == adm1278 ||
 515             mid->driver_data == adm1293 || mid->driver_data == adm1294)
 516                 config_read_fn = i2c_smbus_read_word_data;
 517         else
 518                 config_read_fn = i2c_smbus_read_byte_data;
 519         config = config_read_fn(client, ADM1275_PMON_CONFIG);
 520         if (config < 0)
 521                 return config;
 522
 523         device_config = config_read_fn(client, ADM1275_DEVICE_CONFIG);
 524         if (device_config < 0)
 525                 return device_config;
 526
 527         data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data),
 528                             GFP_KERNEL);
 529         if (!data)
 530                 return -ENOMEM;
 531
 532         if (of_property_read_u32(client->dev.of_node,
 533                                  "shunt-resistor-micro-ohms", &shunt))
 534                 shunt = 1000; /* 1 mOhm if not set via DT */
 535
 536         if (shunt == 0)
 537                 return -EINVAL;
 538
 539         data->id = mid->driver_data;
 540
 541         info = &data->info;
 542
 543         info->pages = 1;
 544         info->format[PSC_VOLTAGE_IN] = direct;
 545         info->format[PSC_VOLTAGE_OUT] = direct;
 546         info->format[PSC_CURRENT_OUT] = direct;
 547         info->format[PSC_POWER] = direct;
 548         info->format[PSC_TEMPERATURE] = direct;
 549         info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 550                         PMBUS_HAVE_SAMPLES;
 551
 552         info->read_word_data = adm1275_read_word_data;
 553         info->read_byte_data = adm1275_read_byte_data;
 554         info->write_word_data = adm1275_write_word_data;
 555
 556         switch (data->id) {
 557         case adm1075:
 558                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 559                         data->have_oc_fault = true;
 560                 else
 561                         data->have_uc_fault = true;
 562                 data->have_pin_max = true;
 563                 data->have_vaux_status = true;
 564
 565                 coefficients = adm1075_coefficients;
 566                 vindex = 0;
 567                 switch (config & ADM1075_IRANGE_MASK) {
 568                 case ADM1075_IRANGE_25:
 569                         cindex = 1;
 570                         pindex = 3;
 571                         break;
 572                 case ADM1075_IRANGE_50:
 573                         cindex = 2;
 574                         pindex = 4;
 575                         break;
 576                 default:
 577                         dev_err(&client->dev, "Invalid input current range");
 578                         break;
 579                 }
 580
 581                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 582                   | PMBUS_HAVE_STATUS_INPUT;
 583                 if (config & ADM1275_VIN_VOUT_SELECT)
 584                         info->func[0] |=
 585                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 586                 break;
 587         case adm1272:
 588                 data->have_vout = true;
 589                 data->have_pin_max = true;
 590                 data->have_temp_max = true;
 591                 data->have_power_sampling = true;
 592
 593                 coefficients = adm1272_coefficients;
 594                 vindex = (config & ADM1275_VRANGE) ? 1 : 0;
 595                 cindex = (config & ADM1272_IRANGE) ? 3 : 2;
 596                 /* pindex depends on the combination of the above */
 597                 switch (config & (ADM1275_VRANGE | ADM1272_IRANGE)) {
 598                 case 0:
 599                 default:
 600                         pindex = 4;
 601                         break;
 602                 case ADM1275_VRANGE:
 603                         pindex = 5;
 604                         break;
 605                 case ADM1272_IRANGE:
 606                         pindex = 6;
 607                         break;
 608                 case ADM1275_VRANGE | ADM1272_IRANGE:
 609                         pindex = 7;
 610                         break;
 611                 }
 612                 tindex = 8;
 613
 614                 info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 615                         PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 616
 617                 /* Enable VOUT if not enabled (it is disabled by default) */
 618                 if (!(config & ADM1278_VOUT_EN)) {
 619                         config |= ADM1278_VOUT_EN;
 620                         ret = i2c_smbus_write_byte_data(client,
 621                                                         ADM1275_PMON_CONFIG,
 622                                                         config);
 623                         if (ret < 0) {
 624                                 dev_err(&client->dev,
 625                                         "Failed to enable VOUT monitoring\n");
 626                                 return -ENODEV;
 627                         }
 628                 }
 629
 630                 if (config & ADM1278_TEMP1_EN)
 631                         info->func[0] |=
 632                                 PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 633                 if (config & ADM1278_VIN_EN)
 634                         info->func[0] |= PMBUS_HAVE_VIN;
 635                 break;
 636         case adm1275:
 637                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 638                         data->have_oc_fault = true;
 639                 else
 640                         data->have_uc_fault = true;
 641                 data->have_vout = true;
 642
 643                 coefficients = adm1275_coefficients;
 644                 vindex = (config & ADM1275_VRANGE) ? 0 : 1;
 645                 cindex = 2;
 646
 647                 if (config & ADM1275_VIN_VOUT_SELECT)
 648                         info->func[0] |=
 649                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 650                 else
 651                         info->func[0] |=
 652                           PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
 653                 break;
 654         case adm1276:
 655                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 656                         data->have_oc_fault = true;
 657                 else
 658                         data->have_uc_fault = true;
 659                 data->have_vout = true;
 660                 data->have_pin_max = true;
 661
 662                 coefficients = adm1276_coefficients;
 663                 vindex = (config & ADM1275_VRANGE) ? 0 : 1;
 664                 cindex = 2;
 665                 pindex = (config & ADM1275_VRANGE) ? 3 : 4;
 666
 667                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 668                   | PMBUS_HAVE_STATUS_INPUT;
 669                 if (config & ADM1275_VIN_VOUT_SELECT)
 670                         info->func[0] |=
 671                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 672                 break;
 673         case adm1278:
 674                 data->have_vout = true;
 675                 data->have_pin_max = true;
 676                 data->have_temp_max = true;
 677                 data->have_power_sampling = true;
 678
 679                 coefficients = adm1278_coefficients;
 680                 vindex = 0;
 681                 cindex = 1;
 682                 pindex = 2;
 683                 tindex = 3;
 684
 685                 info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 686                         PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 687                         PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 688
 689                 /* Enable VOUT & TEMP1 if not enabled (disabled by default) */
 690                 if ((config & (ADM1278_VOUT_EN | ADM1278_TEMP1_EN)) !=
 691                     (ADM1278_VOUT_EN | ADM1278_TEMP1_EN)) {
 692                         config |= ADM1278_VOUT_EN | ADM1278_TEMP1_EN;
 693                         ret = i2c_smbus_write_byte_data(client,
 694                                                         ADM1275_PMON_CONFIG,
 695                                                         config);
 696                         if (ret < 0) {
 697                                 dev_err(&client->dev,
 698                                         "Failed to enable VOUT monitoring\n");
 699                                 return -ENODEV;
 700                         }
 701                 }
 702
 703                 if (config & ADM1278_VIN_EN)
 704                         info->func[0] |= PMBUS_HAVE_VIN;
 705                 break;
 706         case adm1293:
 707         case adm1294:
 708                 data->have_iout_min = true;
 709                 data->have_pin_min = true;
 710                 data->have_pin_max = true;
 711                 data->have_mfr_vaux_status = true;
 712                 data->have_power_sampling = true;
 713
 714                 coefficients = adm1293_coefficients;
 715
 716                 voindex = 0;
 717                 switch (config & ADM1293_VIN_SEL_MASK) {
 718                 case ADM1293_VIN_SEL_012:       /* 1.2V */
 719                         vindex = 0;
 720                         break;
 721                 case ADM1293_VIN_SEL_074:       /* 7.4V */
 722                         vindex = 1;
 723                         break;
 724                 case ADM1293_VIN_SEL_210:       /* 21V */
 725                         vindex = 2;
 726                         break;
 727                 default:                        /* disabled */
 728                         break;
 729                 }
 730
 731                 switch (config & ADM1293_IRANGE_MASK) {
 732                 case ADM1293_IRANGE_25:
 733                         cindex = 3;
 734                         break;
 735                 case ADM1293_IRANGE_50:
 736                         cindex = 4;
 737                         break;
 738                 case ADM1293_IRANGE_100:
 739                         cindex = 5;
 740                         break;
 741                 case ADM1293_IRANGE_200:
 742                         cindex = 6;
 743                         break;
 744                 }
 745
 746                 if (vindex >= 0)
 747                         pindex = 7 + vindex * 4 + (cindex - 3);
 748
 749                 if (config & ADM1293_VAUX_EN)
 750                         info->func[0] |=
 751                                 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 752
 753                 info->func[0] |= PMBUS_HAVE_PIN |
 754                         PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
 755
 756                 break;
 757         default:
 758                 dev_err(&client->dev, "Unsupported device\n");
 759                 return -ENODEV;
 760         }
 761
 762         if (voindex < 0)
 763                 voindex = vindex;
 764         if (vindex >= 0) {
 765                 info->m[PSC_VOLTAGE_IN] = coefficients[vindex].m;
 766                 info->b[PSC_VOLTAGE_IN] = coefficients[vindex].b;
 767                 info->R[PSC_VOLTAGE_IN] = coefficients[vindex].R;
 768         }
 769         if (voindex >= 0) {
 770                 info->m[PSC_VOLTAGE_OUT] = coefficients[voindex].m;
 771                 info->b[PSC_VOLTAGE_OUT] = coefficients[voindex].b;
 772                 info->R[PSC_VOLTAGE_OUT] = coefficients[voindex].R;
 773         }
 774         if (cindex >= 0) {
 775                 /* Scale current with sense resistor value */
 776                 info->m[PSC_CURRENT_OUT] =
 777                         coefficients[cindex].m * shunt / 1000;
 778                 info->b[PSC_CURRENT_OUT] = coefficients[cindex].b;
 779                 info->R[PSC_CURRENT_OUT] = coefficients[cindex].R;
 780         }
 781         if (pindex >= 0) {
 782                 info->m[PSC_POWER] =
 783                         coefficients[pindex].m * shunt / 1000;
 784                 info->b[PSC_POWER] = coefficients[pindex].b;
 785                 info->R[PSC_POWER] = coefficients[pindex].R;
 786         }
 787         if (tindex >= 0) {
 788                 info->m[PSC_TEMPERATURE] = coefficients[tindex].m;
 789                 info->b[PSC_TEMPERATURE] = coefficients[tindex].b;
 790                 info->R[PSC_TEMPERATURE] = coefficients[tindex].R;
 791         }
 792
 793         return pmbus_do_probe(client, id, info);
 794 }
 795
 796 static struct i2c_driver adm1275_driver = {
 797         .driver = {
 798                    .name = "adm1275",
 799                    },
 800         .probe = adm1275_probe,
 801         .remove = pmbus_do_remove,
 802         .id_table = adm1275_id,
 803 };
 804
 805 module_i2c_driver(adm1275_driver);
 806
 807 MODULE_AUTHOR("Guenter Roeck");
 808 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
 809 MODULE_LICENSE("GPL");