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, adm1281, 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_CONTROL            0xd3
  31 #define ADM1275_PMON_CONFIG             0xd4
  32
  33 #define ADM1275_CONVERT_EN              BIT(0)
  34
  35 #define ADM1275_VIN_VOUT_SELECT         BIT(6)
  36 #define ADM1275_VRANGE                  BIT(5)
  37 #define ADM1075_IRANGE_50               BIT(4)
  38 #define ADM1075_IRANGE_25               BIT(3)
  39 #define ADM1075_IRANGE_MASK             (BIT(3) | BIT(4))
  40
  41 #define ADM1272_IRANGE                  BIT(0)
  42
  43 #define ADM1278_TSFILT                  BIT(15)
  44 #define ADM1278_TEMP1_EN                BIT(3)
  45 #define ADM1278_VIN_EN                  BIT(2)
  46 #define ADM1278_VOUT_EN                 BIT(1)
  47
  48 #define ADM1278_PMON_DEFCONFIG          (ADM1278_VOUT_EN | ADM1278_TEMP1_EN | ADM1278_TSFILT)
  49
  50 #define ADM1293_IRANGE_25               0
  51 #define ADM1293_IRANGE_50               BIT(6)
  52 #define ADM1293_IRANGE_100              BIT(7)
  53 #define ADM1293_IRANGE_200              (BIT(6) | BIT(7))
  54 #define ADM1293_IRANGE_MASK             (BIT(6) | BIT(7))
  55
  56 #define ADM1293_VIN_SEL_012             BIT(2)
  57 #define ADM1293_VIN_SEL_074             BIT(3)
  58 #define ADM1293_VIN_SEL_210             (BIT(2) | BIT(3))
  59 #define ADM1293_VIN_SEL_MASK            (BIT(2) | BIT(3))
  60
  61 #define ADM1293_VAUX_EN                 BIT(1)
  62
  63 #define ADM1278_PEAK_TEMP               0xd7
  64 #define ADM1275_IOUT_WARN2_LIMIT        0xd7
  65 #define ADM1275_DEVICE_CONFIG           0xd8
  66
  67 #define ADM1275_IOUT_WARN2_SELECT       BIT(4)
  68
  69 #define ADM1276_PEAK_PIN                0xda
  70 #define ADM1075_READ_VAUX               0xdd
  71 #define ADM1075_VAUX_OV_WARN_LIMIT      0xde
  72 #define ADM1075_VAUX_UV_WARN_LIMIT      0xdf
  73 #define ADM1293_IOUT_MIN                0xe3
  74 #define ADM1293_PIN_MIN                 0xe4
  75 #define ADM1075_VAUX_STATUS             0xf6
  76
  77 #define ADM1075_VAUX_OV_WARN            BIT(7)
  78 #define ADM1075_VAUX_UV_WARN            BIT(6)
  79
  80 #define ADM1275_VI_AVG_SHIFT            0
  81 #define ADM1275_VI_AVG_MASK             GENMASK(ADM1275_VI_AVG_SHIFT + 2, \
  82                                                 ADM1275_VI_AVG_SHIFT)
  83 #define ADM1275_SAMPLES_AVG_MAX         128
  84
  85 #define ADM1278_PWR_AVG_SHIFT           11
  86 #define ADM1278_PWR_AVG_MASK            GENMASK(ADM1278_PWR_AVG_SHIFT + 2, \
  87                                                 ADM1278_PWR_AVG_SHIFT)
  88 #define ADM1278_VI_AVG_SHIFT            8
  89 #define ADM1278_VI_AVG_MASK             GENMASK(ADM1278_VI_AVG_SHIFT + 2, \
  90                                                 ADM1278_VI_AVG_SHIFT)
  91
  92 struct adm1275_data {
  93         int id;
  94         bool have_oc_fault;
  95         bool have_uc_fault;
  96         bool have_vout;
  97         bool have_vaux_status;
  98         bool have_mfr_vaux_status;
  99         bool have_iout_min;
 100         bool have_pin_min;
 101         bool have_pin_max;
 102         bool have_temp_max;
 103         bool have_power_sampling;
 104         struct pmbus_driver_info info;
 105 };
 106
 107 #define to_adm1275_data(x)  container_of(x, struct adm1275_data, info)
 108
 109 struct coefficients {
 110         s16 m;
 111         s16 b;
 112         s16 R;
 113 };
 114
 115 static const struct coefficients adm1075_coefficients[] = {
 116         [0] = { 27169, 0, -1 },         /* voltage */
 117         [1] = { 806, 20475, -1 },       /* current, irange25 */
 118         [2] = { 404, 20475, -1 },       /* current, irange50 */
 119         [3] = { 8549, 0, -1 },          /* power, irange25 */
 120         [4] = { 4279, 0, -1 },          /* power, irange50 */
 121 };
 122
 123 static const struct coefficients adm1272_coefficients[] = {
 124         [0] = { 6770, 0, -2 },          /* voltage, vrange 60V */
 125         [1] = { 4062, 0, -2 },          /* voltage, vrange 100V */
 126         [2] = { 1326, 20480, -1 },      /* current, vsense range 15mV */
 127         [3] = { 663, 20480, -1 },       /* current, vsense range 30mV */
 128         [4] = { 3512, 0, -2 },          /* power, vrange 60V, irange 15mV */
 129         [5] = { 21071, 0, -3 },         /* power, vrange 100V, irange 15mV */
 130         [6] = { 17561, 0, -3 },         /* power, vrange 60V, irange 30mV */
 131         [7] = { 10535, 0, -3 },         /* power, vrange 100V, irange 30mV */
 132         [8] = { 42, 31871, -1 },        /* temperature */
 133
 134 };
 135
 136 static const struct coefficients adm1275_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 };
 141
 142 static const struct coefficients adm1276_coefficients[] = {
 143         [0] = { 19199, 0, -2 },         /* voltage, vrange set */
 144         [1] = { 6720, 0, -1 },          /* voltage, vrange not set */
 145         [2] = { 807, 20475, -1 },       /* current */
 146         [3] = { 6043, 0, -2 },          /* power, vrange set */
 147         [4] = { 2115, 0, -1 },          /* power, vrange not set */
 148 };
 149
 150 static const struct coefficients adm1278_coefficients[] = {
 151         [0] = { 19599, 0, -2 },         /* voltage */
 152         [1] = { 800, 20475, -1 },       /* current */
 153         [2] = { 6123, 0, -2 },          /* power */
 154         [3] = { 42, 31880, -1 },        /* temperature */
 155 };
 156
 157 static const struct coefficients adm1293_coefficients[] = {
 158         [0] = { 3333, -1, 0 },          /* voltage, vrange 1.2V */
 159         [1] = { 5552, -5, -1 },         /* voltage, vrange 7.4V */
 160         [2] = { 19604, -50, -2 },       /* voltage, vrange 21V */
 161         [3] = { 8000, -100, -2 },       /* current, irange25 */
 162         [4] = { 4000, -100, -2 },       /* current, irange50 */
 163         [5] = { 20000, -1000, -3 },     /* current, irange100 */
 164         [6] = { 10000, -1000, -3 },     /* current, irange200 */
 165         [7] = { 10417, 0, -1 },         /* power, 1.2V, irange25 */
 166         [8] = { 5208, 0, -1 },          /* power, 1.2V, irange50 */
 167         [9] = { 26042, 0, -2 },         /* power, 1.2V, irange100 */
 168         [10] = { 13021, 0, -2 },        /* power, 1.2V, irange200 */
 169         [11] = { 17351, 0, -2 },        /* power, 7.4V, irange25 */
 170         [12] = { 8676, 0, -2 },         /* power, 7.4V, irange50 */
 171         [13] = { 4338, 0, -2 },         /* power, 7.4V, irange100 */
 172         [14] = { 21689, 0, -3 },        /* power, 7.4V, irange200 */
 173         [15] = { 6126, 0, -2 },         /* power, 21V, irange25 */
 174         [16] = { 30631, 0, -3 },        /* power, 21V, irange50 */
 175         [17] = { 15316, 0, -3 },        /* power, 21V, irange100 */
 176         [18] = { 7658, 0, -3 },         /* power, 21V, irange200 */
 177 };
 178
 179 static int adm1275_read_samples(const struct adm1275_data *data,
 180                                 struct i2c_client *client, bool is_power)
 181 {
 182         int shift, ret;
 183         u16 mask;
 184
 185         /*
 186          * The PMON configuration register is a 16-bit register only on chips
 187          * supporting power average sampling. On other chips it is an 8-bit
 188          * register.
 189          */
 190         if (data->have_power_sampling) {
 191                 ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
 192                 mask = is_power ? ADM1278_PWR_AVG_MASK : ADM1278_VI_AVG_MASK;
 193                 shift = is_power ? ADM1278_PWR_AVG_SHIFT : ADM1278_VI_AVG_SHIFT;
 194         } else {
 195                 ret = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
 196                 mask = ADM1275_VI_AVG_MASK;
 197                 shift = ADM1275_VI_AVG_SHIFT;
 198         }
 199         if (ret < 0)
 200                 return ret;
 201
 202         return (ret & mask) >> shift;
 203 }
 204
 205 static int adm1275_write_pmon_config(const struct adm1275_data *data,
 206                                      struct i2c_client *client, u16 word)
 207 {
 208         int ret, ret2;
 209
 210         ret = i2c_smbus_write_byte_data(client, ADM1275_PMON_CONTROL, 0);
 211         if (ret)
 212                 return ret;
 213
 214         if (data->have_power_sampling)
 215                 ret = i2c_smbus_write_word_data(client, ADM1275_PMON_CONFIG,
 216                                                 word);
 217         else
 218                 ret = i2c_smbus_write_byte_data(client, ADM1275_PMON_CONFIG,
 219                                                 word);
 220
 221         /*
 222          * We still want to re-enable conversions if writing into
 223          * ADM1275_PMON_CONFIG failed.
 224          */
 225         ret2 = i2c_smbus_write_byte_data(client, ADM1275_PMON_CONTROL,
 226                                          ADM1275_CONVERT_EN);
 227         if (!ret)
 228                 ret = ret2;
 229
 230         return ret;
 231 }
 232
 233 static int adm1275_write_samples(const struct adm1275_data *data,
 234                                  struct i2c_client *client,
 235                                  bool is_power, u16 word)
 236 {
 237         int shift, ret;
 238         u16 mask;
 239
 240         if (data->have_power_sampling) {
 241                 ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
 242                 mask = is_power ? ADM1278_PWR_AVG_MASK : ADM1278_VI_AVG_MASK;
 243                 shift = is_power ? ADM1278_PWR_AVG_SHIFT : ADM1278_VI_AVG_SHIFT;
 244         } else {
 245                 ret = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
 246                 mask = ADM1275_VI_AVG_MASK;
 247                 shift = ADM1275_VI_AVG_SHIFT;
 248         }
 249         if (ret < 0)
 250                 return ret;
 251
 252         word = (ret & ~mask) | ((word << shift) & mask);
 253
 254         return adm1275_write_pmon_config(data, client, word);
 255 }
 256
 257 static int adm1275_read_word_data(struct i2c_client *client, int page,
 258                                   int phase, int reg)
 259 {
 260         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 261         const struct adm1275_data *data = to_adm1275_data(info);
 262         int ret = 0;
 263
 264         if (page > 0)
 265                 return -ENXIO;
 266
 267         switch (reg) {
 268         case PMBUS_IOUT_UC_FAULT_LIMIT:
 269                 if (!data->have_uc_fault)
 270                         return -ENXIO;
 271                 ret = pmbus_read_word_data(client, 0, 0xff,
 272                                            ADM1275_IOUT_WARN2_LIMIT);
 273                 break;
 274         case PMBUS_IOUT_OC_FAULT_LIMIT:
 275                 if (!data->have_oc_fault)
 276                         return -ENXIO;
 277                 ret = pmbus_read_word_data(client, 0, 0xff,
 278                                            ADM1275_IOUT_WARN2_LIMIT);
 279                 break;
 280         case PMBUS_VOUT_OV_WARN_LIMIT:
 281                 if (data->have_vout)
 282                         return -ENODATA;
 283                 ret = pmbus_read_word_data(client, 0, 0xff,
 284                                            ADM1075_VAUX_OV_WARN_LIMIT);
 285                 break;
 286         case PMBUS_VOUT_UV_WARN_LIMIT:
 287                 if (data->have_vout)
 288                         return -ENODATA;
 289                 ret = pmbus_read_word_data(client, 0, 0xff,
 290                                            ADM1075_VAUX_UV_WARN_LIMIT);
 291                 break;
 292         case PMBUS_READ_VOUT:
 293                 if (data->have_vout)
 294                         return -ENODATA;
 295                 ret = pmbus_read_word_data(client, 0, 0xff,
 296                                            ADM1075_READ_VAUX);
 297                 break;
 298         case PMBUS_VIRT_READ_IOUT_MIN:
 299                 if (!data->have_iout_min)
 300                         return -ENXIO;
 301                 ret = pmbus_read_word_data(client, 0, 0xff,
 302                                            ADM1293_IOUT_MIN);
 303                 break;
 304         case PMBUS_VIRT_READ_IOUT_MAX:
 305                 ret = pmbus_read_word_data(client, 0, 0xff,
 306                                            ADM1275_PEAK_IOUT);
 307                 break;
 308         case PMBUS_VIRT_READ_VOUT_MAX:
 309                 ret = pmbus_read_word_data(client, 0, 0xff,
 310                                            ADM1275_PEAK_VOUT);
 311                 break;
 312         case PMBUS_VIRT_READ_VIN_MAX:
 313                 ret = pmbus_read_word_data(client, 0, 0xff,
 314                                            ADM1275_PEAK_VIN);
 315                 break;
 316         case PMBUS_VIRT_READ_PIN_MIN:
 317                 if (!data->have_pin_min)
 318                         return -ENXIO;
 319                 ret = pmbus_read_word_data(client, 0, 0xff,
 320                                            ADM1293_PIN_MIN);
 321                 break;
 322         case PMBUS_VIRT_READ_PIN_MAX:
 323                 if (!data->have_pin_max)
 324                         return -ENXIO;
 325                 ret = pmbus_read_word_data(client, 0, 0xff,
 326                                            ADM1276_PEAK_PIN);
 327                 break;
 328         case PMBUS_VIRT_READ_TEMP_MAX:
 329                 if (!data->have_temp_max)
 330                         return -ENXIO;
 331                 ret = pmbus_read_word_data(client, 0, 0xff,
 332                                            ADM1278_PEAK_TEMP);
 333                 break;
 334         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 335         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 336         case PMBUS_VIRT_RESET_VIN_HISTORY:
 337                 break;
 338         case PMBUS_VIRT_RESET_PIN_HISTORY:
 339                 if (!data->have_pin_max)
 340                         return -ENXIO;
 341                 break;
 342         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 343                 if (!data->have_temp_max)
 344                         return -ENXIO;
 345                 break;
 346         case PMBUS_VIRT_POWER_SAMPLES:
 347                 if (!data->have_power_sampling)
 348                         return -ENXIO;
 349                 ret = adm1275_read_samples(data, client, true);
 350                 if (ret < 0)
 351                         break;
 352                 ret = BIT(ret);
 353                 break;
 354         case PMBUS_VIRT_IN_SAMPLES:
 355         case PMBUS_VIRT_CURR_SAMPLES:
 356                 ret = adm1275_read_samples(data, client, false);
 357                 if (ret < 0)
 358                         break;
 359                 ret = BIT(ret);
 360                 break;
 361         default:
 362                 ret = -ENODATA;
 363                 break;
 364         }
 365         return ret;
 366 }
 367
 368 static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
 369                                    u16 word)
 370 {
 371         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 372         const struct adm1275_data *data = to_adm1275_data(info);
 373         int ret;
 374
 375         if (page > 0)
 376                 return -ENXIO;
 377
 378         switch (reg) {
 379         case PMBUS_IOUT_UC_FAULT_LIMIT:
 380         case PMBUS_IOUT_OC_FAULT_LIMIT:
 381                 ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
 382                                             word);
 383                 break;
 384         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 385                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
 386                 if (!ret && data->have_iout_min)
 387                         ret = pmbus_write_word_data(client, 0,
 388                                                     ADM1293_IOUT_MIN, 0);
 389                 break;
 390         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 391                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
 392                 break;
 393         case PMBUS_VIRT_RESET_VIN_HISTORY:
 394                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
 395                 break;
 396         case PMBUS_VIRT_RESET_PIN_HISTORY:
 397                 ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
 398                 if (!ret && data->have_pin_min)
 399                         ret = pmbus_write_word_data(client, 0,
 400                                                     ADM1293_PIN_MIN, 0);
 401                 break;
 402         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 403                 ret = pmbus_write_word_data(client, 0, ADM1278_PEAK_TEMP, 0);
 404                 break;
 405         case PMBUS_VIRT_POWER_SAMPLES:
 406                 if (!data->have_power_sampling)
 407                         return -ENXIO;
 408                 word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
 409                 ret = adm1275_write_samples(data, client, true, ilog2(word));
 410                 break;
 411         case PMBUS_VIRT_IN_SAMPLES:
 412         case PMBUS_VIRT_CURR_SAMPLES:
 413                 word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
 414                 ret = adm1275_write_samples(data, client, false, ilog2(word));
 415                 break;
 416         default:
 417                 ret = -ENODATA;
 418                 break;
 419         }
 420         return ret;
 421 }
 422
 423 static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
 424 {
 425         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 426         const struct adm1275_data *data = to_adm1275_data(info);
 427         int mfr_status, ret;
 428
 429         if (page > 0)
 430                 return -ENXIO;
 431
 432         switch (reg) {
 433         case PMBUS_STATUS_IOUT:
 434                 ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
 435                 if (ret < 0)
 436                         break;
 437                 if (!data->have_oc_fault && !data->have_uc_fault)
 438                         break;
 439                 mfr_status = pmbus_read_byte_data(client, page,
 440                                                   PMBUS_STATUS_MFR_SPECIFIC);
 441                 if (mfr_status < 0)
 442                         return mfr_status;
 443                 if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
 444                         ret |= data->have_oc_fault ?
 445                           PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
 446                 }
 447                 break;
 448         case PMBUS_STATUS_VOUT:
 449                 if (data->have_vout)
 450                         return -ENODATA;
 451                 ret = 0;
 452                 if (data->have_vaux_status) {
 453                         mfr_status = pmbus_read_byte_data(client, 0,
 454                                                           ADM1075_VAUX_STATUS);
 455                         if (mfr_status < 0)
 456                                 return mfr_status;
 457                         if (mfr_status & ADM1075_VAUX_OV_WARN)
 458                                 ret |= PB_VOLTAGE_OV_WARNING;
 459                         if (mfr_status & ADM1075_VAUX_UV_WARN)
 460                                 ret |= PB_VOLTAGE_UV_WARNING;
 461                 } else if (data->have_mfr_vaux_status) {
 462                         mfr_status = pmbus_read_byte_data(client, page,
 463                                                 PMBUS_STATUS_MFR_SPECIFIC);
 464                         if (mfr_status < 0)
 465                                 return mfr_status;
 466                         if (mfr_status & ADM1293_MFR_STATUS_VAUX_OV_WARN)
 467                                 ret |= PB_VOLTAGE_OV_WARNING;
 468                         if (mfr_status & ADM1293_MFR_STATUS_VAUX_UV_WARN)
 469                                 ret |= PB_VOLTAGE_UV_WARNING;
 470                 }
 471                 break;
 472         default:
 473                 ret = -ENODATA;
 474                 break;
 475         }
 476         return ret;
 477 }
 478
 479 static const struct i2c_device_id adm1275_id[] = {
 480         { "adm1075", adm1075 },
 481         { "adm1272", adm1272 },
 482         { "adm1275", adm1275 },
 483         { "adm1276", adm1276 },
 484         { "adm1278", adm1278 },
 485         { "adm1281", adm1281 },
 486         { "adm1293", adm1293 },
 487         { "adm1294", adm1294 },
 488         { }
 489 };
 490 MODULE_DEVICE_TABLE(i2c, adm1275_id);
 491
 492 /* Enable VOUT & TEMP1 if not enabled (disabled by default) */
 493 static int adm1275_enable_vout_temp(struct adm1275_data *data,
 494                                     struct i2c_client *client, int config)
 495 {
 496         int ret;
 497
 498         if ((config & ADM1278_PMON_DEFCONFIG) != ADM1278_PMON_DEFCONFIG) {
 499                 config |= ADM1278_PMON_DEFCONFIG;
 500                 ret = adm1275_write_pmon_config(data, client, config);
 501                 if (ret < 0) {
 502                         dev_err(&client->dev, "Failed to enable VOUT/TEMP1 monitoring\n");
 503                         return ret;
 504                 }
 505         }
 506         return 0;
 507 }
 508
 509 static int adm1275_probe(struct i2c_client *client)
 510 {
 511         s32 (*config_read_fn)(const struct i2c_client *client, u8 reg);
 512         u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
 513         int config, device_config;
 514         int ret;
 515         struct pmbus_driver_info *info;
 516         struct adm1275_data *data;
 517         const struct i2c_device_id *mid;
 518         const struct coefficients *coefficients;
 519         int vindex = -1, voindex = -1, cindex = -1, pindex = -1;
 520         int tindex = -1;
 521         u32 shunt;
 522         u32 avg;
 523
 524         if (!i2c_check_functionality(client->adapter,
 525                                      I2C_FUNC_SMBUS_READ_BYTE_DATA
 526                                      | I2C_FUNC_SMBUS_BLOCK_DATA))
 527                 return -ENODEV;
 528
 529         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
 530         if (ret < 0) {
 531                 dev_err(&client->dev, "Failed to read Manufacturer ID\n");
 532                 return ret;
 533         }
 534         if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
 535                 dev_err(&client->dev, "Unsupported Manufacturer ID\n");
 536                 return -ENODEV;
 537         }
 538
 539         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
 540         if (ret < 0) {
 541                 dev_err(&client->dev, "Failed to read Manufacturer Model\n");
 542                 return ret;
 543         }
 544         for (mid = adm1275_id; mid->name[0]; mid++) {
 545                 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 546                         break;
 547         }
 548         if (!mid->name[0]) {
 549                 dev_err(&client->dev, "Unsupported device\n");
 550                 return -ENODEV;
 551         }
 552
 553         if (strcmp(client->name, mid->name) != 0)
 554                 dev_notice(&client->dev,
 555                            "Device mismatch: Configured %s, detected %s\n",
 556                            client->name, mid->name);
 557
 558         if (mid->driver_data == adm1272 || mid->driver_data == adm1278 ||
 559             mid->driver_data == adm1281 || mid->driver_data == adm1293 ||
 560             mid->driver_data == adm1294)
 561                 config_read_fn = i2c_smbus_read_word_data;
 562         else
 563                 config_read_fn = i2c_smbus_read_byte_data;
 564         config = config_read_fn(client, ADM1275_PMON_CONFIG);
 565         if (config < 0)
 566                 return config;
 567
 568         device_config = config_read_fn(client, ADM1275_DEVICE_CONFIG);
 569         if (device_config < 0)
 570                 return device_config;
 571
 572         data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data),
 573                             GFP_KERNEL);
 574         if (!data)
 575                 return -ENOMEM;
 576
 577         if (of_property_read_u32(client->dev.of_node,
 578                                  "shunt-resistor-micro-ohms", &shunt))
 579                 shunt = 1000; /* 1 mOhm if not set via DT */
 580
 581         if (shunt == 0)
 582                 return -EINVAL;
 583
 584         data->id = mid->driver_data;
 585
 586         info = &data->info;
 587
 588         info->pages = 1;
 589         info->format[PSC_VOLTAGE_IN] = direct;
 590         info->format[PSC_VOLTAGE_OUT] = direct;
 591         info->format[PSC_CURRENT_OUT] = direct;
 592         info->format[PSC_POWER] = direct;
 593         info->format[PSC_TEMPERATURE] = direct;
 594         info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 595                         PMBUS_HAVE_SAMPLES;
 596
 597         info->read_word_data = adm1275_read_word_data;
 598         info->read_byte_data = adm1275_read_byte_data;
 599         info->write_word_data = adm1275_write_word_data;
 600
 601         switch (data->id) {
 602         case adm1075:
 603                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 604                         data->have_oc_fault = true;
 605                 else
 606                         data->have_uc_fault = true;
 607                 data->have_pin_max = true;
 608                 data->have_vaux_status = true;
 609
 610                 coefficients = adm1075_coefficients;
 611                 vindex = 0;
 612                 switch (config & ADM1075_IRANGE_MASK) {
 613                 case ADM1075_IRANGE_25:
 614                         cindex = 1;
 615                         pindex = 3;
 616                         break;
 617                 case ADM1075_IRANGE_50:
 618                         cindex = 2;
 619                         pindex = 4;
 620                         break;
 621                 default:
 622                         dev_err(&client->dev, "Invalid input current range");
 623                         break;
 624                 }
 625
 626                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 627                   | PMBUS_HAVE_STATUS_INPUT;
 628                 if (config & ADM1275_VIN_VOUT_SELECT)
 629                         info->func[0] |=
 630                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 631                 break;
 632         case adm1272:
 633                 data->have_vout = true;
 634                 data->have_pin_max = true;
 635                 data->have_temp_max = true;
 636                 data->have_power_sampling = true;
 637
 638                 coefficients = adm1272_coefficients;
 639                 vindex = (config & ADM1275_VRANGE) ? 1 : 0;
 640                 cindex = (config & ADM1272_IRANGE) ? 3 : 2;
 641                 /* pindex depends on the combination of the above */
 642                 switch (config & (ADM1275_VRANGE | ADM1272_IRANGE)) {
 643                 case 0:
 644                 default:
 645                         pindex = 4;
 646                         break;
 647                 case ADM1275_VRANGE:
 648                         pindex = 5;
 649                         break;
 650                 case ADM1272_IRANGE:
 651                         pindex = 6;
 652                         break;
 653                 case ADM1275_VRANGE | ADM1272_IRANGE:
 654                         pindex = 7;
 655                         break;
 656                 }
 657                 tindex = 8;
 658
 659                 info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 660                         PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 661                         PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 662
 663                 ret = adm1275_enable_vout_temp(data, client, config);
 664                 if (ret)
 665                         return ret;
 666
 667                 if (config & ADM1278_VIN_EN)
 668                         info->func[0] |= PMBUS_HAVE_VIN;
 669                 break;
 670         case adm1275:
 671                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 672                         data->have_oc_fault = true;
 673                 else
 674                         data->have_uc_fault = true;
 675                 data->have_vout = true;
 676
 677                 coefficients = adm1275_coefficients;
 678                 vindex = (config & ADM1275_VRANGE) ? 0 : 1;
 679                 cindex = 2;
 680
 681                 if (config & ADM1275_VIN_VOUT_SELECT)
 682                         info->func[0] |=
 683                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 684                 else
 685                         info->func[0] |=
 686                           PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
 687                 break;
 688         case adm1276:
 689                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 690                         data->have_oc_fault = true;
 691                 else
 692                         data->have_uc_fault = true;
 693                 data->have_vout = true;
 694                 data->have_pin_max = true;
 695
 696                 coefficients = adm1276_coefficients;
 697                 vindex = (config & ADM1275_VRANGE) ? 0 : 1;
 698                 cindex = 2;
 699                 pindex = (config & ADM1275_VRANGE) ? 3 : 4;
 700
 701                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 702                   | PMBUS_HAVE_STATUS_INPUT;
 703                 if (config & ADM1275_VIN_VOUT_SELECT)
 704                         info->func[0] |=
 705                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 706                 break;
 707         case adm1278:
 708         case adm1281:
 709                 data->have_vout = true;
 710                 data->have_pin_max = true;
 711                 data->have_temp_max = true;
 712                 data->have_power_sampling = true;
 713
 714                 coefficients = adm1278_coefficients;
 715                 vindex = 0;
 716                 cindex = 1;
 717                 pindex = 2;
 718                 tindex = 3;
 719
 720                 info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 721                         PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 722                         PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 723
 724                 ret = adm1275_enable_vout_temp(data, client, config);
 725                 if (ret)
 726                         return ret;
 727
 728                 if (config & ADM1278_VIN_EN)
 729                         info->func[0] |= PMBUS_HAVE_VIN;
 730                 break;
 731         case adm1293:
 732         case adm1294:
 733                 data->have_iout_min = true;
 734                 data->have_pin_min = true;
 735                 data->have_pin_max = true;
 736                 data->have_mfr_vaux_status = true;
 737                 data->have_power_sampling = true;
 738
 739                 coefficients = adm1293_coefficients;
 740
 741                 voindex = 0;
 742                 switch (config & ADM1293_VIN_SEL_MASK) {
 743                 case ADM1293_VIN_SEL_012:       /* 1.2V */
 744                         vindex = 0;
 745                         break;
 746                 case ADM1293_VIN_SEL_074:       /* 7.4V */
 747                         vindex = 1;
 748                         break;
 749                 case ADM1293_VIN_SEL_210:       /* 21V */
 750                         vindex = 2;
 751                         break;
 752                 default:                        /* disabled */
 753                         break;
 754                 }
 755
 756                 switch (config & ADM1293_IRANGE_MASK) {
 757                 case ADM1293_IRANGE_25:
 758                         cindex = 3;
 759                         break;
 760                 case ADM1293_IRANGE_50:
 761                         cindex = 4;
 762                         break;
 763                 case ADM1293_IRANGE_100:
 764                         cindex = 5;
 765                         break;
 766                 case ADM1293_IRANGE_200:
 767                         cindex = 6;
 768                         break;
 769                 }
 770
 771                 if (vindex >= 0)
 772                         pindex = 7 + vindex * 4 + (cindex - 3);
 773
 774                 if (config & ADM1293_VAUX_EN)
 775                         info->func[0] |=
 776                                 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 777
 778                 info->func[0] |= PMBUS_HAVE_PIN |
 779                         PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
 780
 781                 break;
 782         default:
 783                 dev_err(&client->dev, "Unsupported device\n");
 784                 return -ENODEV;
 785         }
 786
 787         if (data->have_power_sampling &&
 788             of_property_read_u32(client->dev.of_node,
 789                                  "adi,power-sample-average", &avg) == 0) {
 790                 if (!avg || avg > ADM1275_SAMPLES_AVG_MAX ||
 791                     BIT(__fls(avg)) != avg) {
 792                         dev_err(&client->dev,
 793                                 "Invalid number of power samples");
 794                         return -EINVAL;
 795                 }
 796                 ret = adm1275_write_samples(data, client, true, ilog2(avg));
 797                 if (ret < 0) {
 798                         dev_err(&client->dev,
 799                                 "Setting power sample averaging failed with error %d",
 800                                 ret);
 801                         return ret;
 802                 }
 803         }
 804
 805         if (of_property_read_u32(client->dev.of_node,
 806                                 "adi,volt-curr-sample-average", &avg) == 0) {
 807                 if (!avg || avg > ADM1275_SAMPLES_AVG_MAX ||
 808                     BIT(__fls(avg)) != avg) {
 809                         dev_err(&client->dev,
 810                                 "Invalid number of voltage/current samples");
 811                         return -EINVAL;
 812                 }
 813                 ret = adm1275_write_samples(data, client, false, ilog2(avg));
 814                 if (ret < 0) {
 815                         dev_err(&client->dev,
 816                                 "Setting voltage and current sample averaging failed with error %d",
 817                                 ret);
 818                         return ret;
 819                 }
 820         }
 821
 822         if (voindex < 0)
 823                 voindex = vindex;
 824         if (vindex >= 0) {
 825                 info->m[PSC_VOLTAGE_IN] = coefficients[vindex].m;
 826                 info->b[PSC_VOLTAGE_IN] = coefficients[vindex].b;
 827                 info->R[PSC_VOLTAGE_IN] = coefficients[vindex].R;
 828         }
 829         if (voindex >= 0) {
 830                 info->m[PSC_VOLTAGE_OUT] = coefficients[voindex].m;
 831                 info->b[PSC_VOLTAGE_OUT] = coefficients[voindex].b;
 832                 info->R[PSC_VOLTAGE_OUT] = coefficients[voindex].R;
 833         }
 834         if (cindex >= 0) {
 835                 /* Scale current with sense resistor value */
 836                 info->m[PSC_CURRENT_OUT] =
 837                         coefficients[cindex].m * shunt / 1000;
 838                 info->b[PSC_CURRENT_OUT] = coefficients[cindex].b;
 839                 info->R[PSC_CURRENT_OUT] = coefficients[cindex].R;
 840         }
 841         if (pindex >= 0) {
 842                 info->m[PSC_POWER] =
 843                         coefficients[pindex].m * shunt / 1000;
 844                 info->b[PSC_POWER] = coefficients[pindex].b;
 845                 info->R[PSC_POWER] = coefficients[pindex].R;
 846         }
 847         if (tindex >= 0) {
 848                 info->m[PSC_TEMPERATURE] = coefficients[tindex].m;
 849                 info->b[PSC_TEMPERATURE] = coefficients[tindex].b;
 850                 info->R[PSC_TEMPERATURE] = coefficients[tindex].R;
 851         }
 852
 853         return pmbus_do_probe(client, info);
 854 }
 855
 856 static struct i2c_driver adm1275_driver = {
 857         .driver = {
 858                    .name = "adm1275",
 859                    },
 860         .probe = adm1275_probe,
 861         .id_table = adm1275_id,
 862 };
 863
 864 module_i2c_driver(adm1275_driver);
 865
 866 MODULE_AUTHOR("Guenter Roeck");
 867 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
 868 MODULE_LICENSE("GPL");
 869 MODULE_IMPORT_NS("PMBUS");