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_TSFILT                  BIT(15)
  41 #define ADM1278_TEMP1_EN                BIT(3)
  42 #define ADM1278_VIN_EN                  BIT(2)
  43 #define ADM1278_VOUT_EN                 BIT(1)
  44
  45 #define ADM1278_PMON_DEFCONFIG          (ADM1278_VOUT_EN | ADM1278_TEMP1_EN | ADM1278_TSFILT)
  46
  47 #define ADM1293_IRANGE_25               0
  48 #define ADM1293_IRANGE_50               BIT(6)
  49 #define ADM1293_IRANGE_100              BIT(7)
  50 #define ADM1293_IRANGE_200              (BIT(6) | BIT(7))
  51 #define ADM1293_IRANGE_MASK             (BIT(6) | BIT(7))
  52
  53 #define ADM1293_VIN_SEL_012             BIT(2)
  54 #define ADM1293_VIN_SEL_074             BIT(3)
  55 #define ADM1293_VIN_SEL_210             (BIT(2) | BIT(3))
  56 #define ADM1293_VIN_SEL_MASK            (BIT(2) | BIT(3))
  57
  58 #define ADM1293_VAUX_EN                 BIT(1)
  59
  60 #define ADM1278_PEAK_TEMP               0xd7
  61 #define ADM1275_IOUT_WARN2_LIMIT        0xd7
  62 #define ADM1275_DEVICE_CONFIG           0xd8
  63
  64 #define ADM1275_IOUT_WARN2_SELECT       BIT(4)
  65
  66 #define ADM1276_PEAK_PIN                0xda
  67 #define ADM1075_READ_VAUX               0xdd
  68 #define ADM1075_VAUX_OV_WARN_LIMIT      0xde
  69 #define ADM1075_VAUX_UV_WARN_LIMIT      0xdf
  70 #define ADM1293_IOUT_MIN                0xe3
  71 #define ADM1293_PIN_MIN                 0xe4
  72 #define ADM1075_VAUX_STATUS             0xf6
  73
  74 #define ADM1075_VAUX_OV_WARN            BIT(7)
  75 #define ADM1075_VAUX_UV_WARN            BIT(6)
  76
  77 #define ADM1275_VI_AVG_SHIFT            0
  78 #define ADM1275_VI_AVG_MASK             GENMASK(ADM1275_VI_AVG_SHIFT + 2, \
  79                                                 ADM1275_VI_AVG_SHIFT)
  80 #define ADM1275_SAMPLES_AVG_MAX         128
  81
  82 #define ADM1278_PWR_AVG_SHIFT           11
  83 #define ADM1278_PWR_AVG_MASK            GENMASK(ADM1278_PWR_AVG_SHIFT + 2, \
  84                                                 ADM1278_PWR_AVG_SHIFT)
  85 #define ADM1278_VI_AVG_SHIFT            8
  86 #define ADM1278_VI_AVG_MASK             GENMASK(ADM1278_VI_AVG_SHIFT + 2, \
  87                                                 ADM1278_VI_AVG_SHIFT)
  88
  89 struct adm1275_data {
  90         int id;
  91         bool have_oc_fault;
  92         bool have_uc_fault;
  93         bool have_vout;
  94         bool have_vaux_status;
  95         bool have_mfr_vaux_status;
  96         bool have_iout_min;
  97         bool have_pin_min;
  98         bool have_pin_max;
  99         bool have_temp_max;
 100         bool have_power_sampling;
 101         struct pmbus_driver_info info;
 102 };
 103
 104 #define to_adm1275_data(x)  container_of(x, struct adm1275_data, info)
 105
 106 struct coefficients {
 107         s16 m;
 108         s16 b;
 109         s16 R;
 110 };
 111
 112 static const struct coefficients adm1075_coefficients[] = {
 113         [0] = { 27169, 0, -1 },         /* voltage */
 114         [1] = { 806, 20475, -1 },       /* current, irange25 */
 115         [2] = { 404, 20475, -1 },       /* current, irange50 */
 116         [3] = { 8549, 0, -1 },          /* power, irange25 */
 117         [4] = { 4279, 0, -1 },          /* power, irange50 */
 118 };
 119
 120 static const struct coefficients adm1272_coefficients[] = {
 121         [0] = { 6770, 0, -2 },          /* voltage, vrange 60V */
 122         [1] = { 4062, 0, -2 },          /* voltage, vrange 100V */
 123         [2] = { 1326, 20480, -1 },      /* current, vsense range 15mV */
 124         [3] = { 663, 20480, -1 },       /* current, vsense range 30mV */
 125         [4] = { 3512, 0, -2 },          /* power, vrange 60V, irange 15mV */
 126         [5] = { 21071, 0, -3 },         /* power, vrange 100V, irange 15mV */
 127         [6] = { 17561, 0, -3 },         /* power, vrange 60V, irange 30mV */
 128         [7] = { 10535, 0, -3 },         /* power, vrange 100V, irange 30mV */
 129         [8] = { 42, 31871, -1 },        /* temperature */
 130
 131 };
 132
 133 static const struct coefficients adm1275_coefficients[] = {
 134         [0] = { 19199, 0, -2 },         /* voltage, vrange set */
 135         [1] = { 6720, 0, -1 },          /* voltage, vrange not set */
 136         [2] = { 807, 20475, -1 },       /* current */
 137 };
 138
 139 static const struct coefficients adm1276_coefficients[] = {
 140         [0] = { 19199, 0, -2 },         /* voltage, vrange set */
 141         [1] = { 6720, 0, -1 },          /* voltage, vrange not set */
 142         [2] = { 807, 20475, -1 },       /* current */
 143         [3] = { 6043, 0, -2 },          /* power, vrange set */
 144         [4] = { 2115, 0, -1 },          /* power, vrange not set */
 145 };
 146
 147 static const struct coefficients adm1278_coefficients[] = {
 148         [0] = { 19599, 0, -2 },         /* voltage */
 149         [1] = { 800, 20475, -1 },       /* current */
 150         [2] = { 6123, 0, -2 },          /* power */
 151         [3] = { 42, 31880, -1 },        /* temperature */
 152 };
 153
 154 static const struct coefficients adm1293_coefficients[] = {
 155         [0] = { 3333, -1, 0 },          /* voltage, vrange 1.2V */
 156         [1] = { 5552, -5, -1 },         /* voltage, vrange 7.4V */
 157         [2] = { 19604, -50, -2 },       /* voltage, vrange 21V */
 158         [3] = { 8000, -100, -2 },       /* current, irange25 */
 159         [4] = { 4000, -100, -2 },       /* current, irange50 */
 160         [5] = { 20000, -1000, -3 },     /* current, irange100 */
 161         [6] = { 10000, -1000, -3 },     /* current, irange200 */
 162         [7] = { 10417, 0, -1 },         /* power, 1.2V, irange25 */
 163         [8] = { 5208, 0, -1 },          /* power, 1.2V, irange50 */
 164         [9] = { 26042, 0, -2 },         /* power, 1.2V, irange100 */
 165         [10] = { 13021, 0, -2 },        /* power, 1.2V, irange200 */
 166         [11] = { 17351, 0, -2 },        /* power, 7.4V, irange25 */
 167         [12] = { 8676, 0, -2 },         /* power, 7.4V, irange50 */
 168         [13] = { 4338, 0, -2 },         /* power, 7.4V, irange100 */
 169         [14] = { 21689, 0, -3 },        /* power, 7.4V, irange200 */
 170         [15] = { 6126, 0, -2 },         /* power, 21V, irange25 */
 171         [16] = { 30631, 0, -3 },        /* power, 21V, irange50 */
 172         [17] = { 15316, 0, -3 },        /* power, 21V, irange100 */
 173         [18] = { 7658, 0, -3 },         /* power, 21V, irange200 */
 174 };
 175
 176 static int adm1275_read_pmon_config(const struct adm1275_data *data,
 177                                     struct i2c_client *client, bool is_power)
 178 {
 179         int shift, ret;
 180         u16 mask;
 181
 182         /*
 183          * The PMON configuration register is a 16-bit register only on chips
 184          * supporting power average sampling. On other chips it is an 8-bit
 185          * register.
 186          */
 187         if (data->have_power_sampling) {
 188                 ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
 189                 mask = is_power ? ADM1278_PWR_AVG_MASK : ADM1278_VI_AVG_MASK;
 190                 shift = is_power ? ADM1278_PWR_AVG_SHIFT : ADM1278_VI_AVG_SHIFT;
 191         } else {
 192                 ret = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
 193                 mask = ADM1275_VI_AVG_MASK;
 194                 shift = ADM1275_VI_AVG_SHIFT;
 195         }
 196         if (ret < 0)
 197                 return ret;
 198
 199         return (ret & mask) >> shift;
 200 }
 201
 202 static int adm1275_write_pmon_config(const struct adm1275_data *data,
 203                                      struct i2c_client *client,
 204                                      bool is_power, u16 word)
 205 {
 206         int shift, ret;
 207         u16 mask;
 208
 209         if (data->have_power_sampling) {
 210                 ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
 211                 mask = is_power ? ADM1278_PWR_AVG_MASK : ADM1278_VI_AVG_MASK;
 212                 shift = is_power ? ADM1278_PWR_AVG_SHIFT : ADM1278_VI_AVG_SHIFT;
 213         } else {
 214                 ret = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
 215                 mask = ADM1275_VI_AVG_MASK;
 216                 shift = ADM1275_VI_AVG_SHIFT;
 217         }
 218         if (ret < 0)
 219                 return ret;
 220
 221         word = (ret & ~mask) | ((word << shift) & mask);
 222         if (data->have_power_sampling)
 223                 ret = i2c_smbus_write_word_data(client, ADM1275_PMON_CONFIG,
 224                                                 word);
 225         else
 226                 ret = i2c_smbus_write_byte_data(client, ADM1275_PMON_CONFIG,
 227                                                 word);
 228
 229         return ret;
 230 }
 231
 232 static int adm1275_read_word_data(struct i2c_client *client, int page,
 233                                   int phase, int reg)
 234 {
 235         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 236         const struct adm1275_data *data = to_adm1275_data(info);
 237         int ret = 0;
 238
 239         if (page > 0)
 240                 return -ENXIO;
 241
 242         switch (reg) {
 243         case PMBUS_IOUT_UC_FAULT_LIMIT:
 244                 if (!data->have_uc_fault)
 245                         return -ENXIO;
 246                 ret = pmbus_read_word_data(client, 0, 0xff,
 247                                            ADM1275_IOUT_WARN2_LIMIT);
 248                 break;
 249         case PMBUS_IOUT_OC_FAULT_LIMIT:
 250                 if (!data->have_oc_fault)
 251                         return -ENXIO;
 252                 ret = pmbus_read_word_data(client, 0, 0xff,
 253                                            ADM1275_IOUT_WARN2_LIMIT);
 254                 break;
 255         case PMBUS_VOUT_OV_WARN_LIMIT:
 256                 if (data->have_vout)
 257                         return -ENODATA;
 258                 ret = pmbus_read_word_data(client, 0, 0xff,
 259                                            ADM1075_VAUX_OV_WARN_LIMIT);
 260                 break;
 261         case PMBUS_VOUT_UV_WARN_LIMIT:
 262                 if (data->have_vout)
 263                         return -ENODATA;
 264                 ret = pmbus_read_word_data(client, 0, 0xff,
 265                                            ADM1075_VAUX_UV_WARN_LIMIT);
 266                 break;
 267         case PMBUS_READ_VOUT:
 268                 if (data->have_vout)
 269                         return -ENODATA;
 270                 ret = pmbus_read_word_data(client, 0, 0xff,
 271                                            ADM1075_READ_VAUX);
 272                 break;
 273         case PMBUS_VIRT_READ_IOUT_MIN:
 274                 if (!data->have_iout_min)
 275                         return -ENXIO;
 276                 ret = pmbus_read_word_data(client, 0, 0xff,
 277                                            ADM1293_IOUT_MIN);
 278                 break;
 279         case PMBUS_VIRT_READ_IOUT_MAX:
 280                 ret = pmbus_read_word_data(client, 0, 0xff,
 281                                            ADM1275_PEAK_IOUT);
 282                 break;
 283         case PMBUS_VIRT_READ_VOUT_MAX:
 284                 ret = pmbus_read_word_data(client, 0, 0xff,
 285                                            ADM1275_PEAK_VOUT);
 286                 break;
 287         case PMBUS_VIRT_READ_VIN_MAX:
 288                 ret = pmbus_read_word_data(client, 0, 0xff,
 289                                            ADM1275_PEAK_VIN);
 290                 break;
 291         case PMBUS_VIRT_READ_PIN_MIN:
 292                 if (!data->have_pin_min)
 293                         return -ENXIO;
 294                 ret = pmbus_read_word_data(client, 0, 0xff,
 295                                            ADM1293_PIN_MIN);
 296                 break;
 297         case PMBUS_VIRT_READ_PIN_MAX:
 298                 if (!data->have_pin_max)
 299                         return -ENXIO;
 300                 ret = pmbus_read_word_data(client, 0, 0xff,
 301                                            ADM1276_PEAK_PIN);
 302                 break;
 303         case PMBUS_VIRT_READ_TEMP_MAX:
 304                 if (!data->have_temp_max)
 305                         return -ENXIO;
 306                 ret = pmbus_read_word_data(client, 0, 0xff,
 307                                            ADM1278_PEAK_TEMP);
 308                 break;
 309         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 310         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 311         case PMBUS_VIRT_RESET_VIN_HISTORY:
 312                 break;
 313         case PMBUS_VIRT_RESET_PIN_HISTORY:
 314                 if (!data->have_pin_max)
 315                         return -ENXIO;
 316                 break;
 317         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 318                 if (!data->have_temp_max)
 319                         return -ENXIO;
 320                 break;
 321         case PMBUS_VIRT_POWER_SAMPLES:
 322                 if (!data->have_power_sampling)
 323                         return -ENXIO;
 324                 ret = adm1275_read_pmon_config(data, client, true);
 325                 if (ret < 0)
 326                         break;
 327                 ret = BIT(ret);
 328                 break;
 329         case PMBUS_VIRT_IN_SAMPLES:
 330         case PMBUS_VIRT_CURR_SAMPLES:
 331                 ret = adm1275_read_pmon_config(data, client, false);
 332                 if (ret < 0)
 333                         break;
 334                 ret = BIT(ret);
 335                 break;
 336         default:
 337                 ret = -ENODATA;
 338                 break;
 339         }
 340         return ret;
 341 }
 342
 343 static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
 344                                    u16 word)
 345 {
 346         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 347         const struct adm1275_data *data = to_adm1275_data(info);
 348         int ret;
 349
 350         if (page > 0)
 351                 return -ENXIO;
 352
 353         switch (reg) {
 354         case PMBUS_IOUT_UC_FAULT_LIMIT:
 355         case PMBUS_IOUT_OC_FAULT_LIMIT:
 356                 ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
 357                                             word);
 358                 break;
 359         case PMBUS_VIRT_RESET_IOUT_HISTORY:
 360                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
 361                 if (!ret && data->have_iout_min)
 362                         ret = pmbus_write_word_data(client, 0,
 363                                                     ADM1293_IOUT_MIN, 0);
 364                 break;
 365         case PMBUS_VIRT_RESET_VOUT_HISTORY:
 366                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VOUT, 0);
 367                 break;
 368         case PMBUS_VIRT_RESET_VIN_HISTORY:
 369                 ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_VIN, 0);
 370                 break;
 371         case PMBUS_VIRT_RESET_PIN_HISTORY:
 372                 ret = pmbus_write_word_data(client, 0, ADM1276_PEAK_PIN, 0);
 373                 if (!ret && data->have_pin_min)
 374                         ret = pmbus_write_word_data(client, 0,
 375                                                     ADM1293_PIN_MIN, 0);
 376                 break;
 377         case PMBUS_VIRT_RESET_TEMP_HISTORY:
 378                 ret = pmbus_write_word_data(client, 0, ADM1278_PEAK_TEMP, 0);
 379                 break;
 380         case PMBUS_VIRT_POWER_SAMPLES:
 381                 if (!data->have_power_sampling)
 382                         return -ENXIO;
 383                 word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
 384                 ret = adm1275_write_pmon_config(data, client, true,
 385                                                 ilog2(word));
 386                 break;
 387         case PMBUS_VIRT_IN_SAMPLES:
 388         case PMBUS_VIRT_CURR_SAMPLES:
 389                 word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
 390                 ret = adm1275_write_pmon_config(data, client, false,
 391                                                 ilog2(word));
 392                 break;
 393         default:
 394                 ret = -ENODATA;
 395                 break;
 396         }
 397         return ret;
 398 }
 399
 400 static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
 401 {
 402         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 403         const struct adm1275_data *data = to_adm1275_data(info);
 404         int mfr_status, ret;
 405
 406         if (page > 0)
 407                 return -ENXIO;
 408
 409         switch (reg) {
 410         case PMBUS_STATUS_IOUT:
 411                 ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
 412                 if (ret < 0)
 413                         break;
 414                 if (!data->have_oc_fault && !data->have_uc_fault)
 415                         break;
 416                 mfr_status = pmbus_read_byte_data(client, page,
 417                                                   PMBUS_STATUS_MFR_SPECIFIC);
 418                 if (mfr_status < 0)
 419                         return mfr_status;
 420                 if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
 421                         ret |= data->have_oc_fault ?
 422                           PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
 423                 }
 424                 break;
 425         case PMBUS_STATUS_VOUT:
 426                 if (data->have_vout)
 427                         return -ENODATA;
 428                 ret = 0;
 429                 if (data->have_vaux_status) {
 430                         mfr_status = pmbus_read_byte_data(client, 0,
 431                                                           ADM1075_VAUX_STATUS);
 432                         if (mfr_status < 0)
 433                                 return mfr_status;
 434                         if (mfr_status & ADM1075_VAUX_OV_WARN)
 435                                 ret |= PB_VOLTAGE_OV_WARNING;
 436                         if (mfr_status & ADM1075_VAUX_UV_WARN)
 437                                 ret |= PB_VOLTAGE_UV_WARNING;
 438                 } else if (data->have_mfr_vaux_status) {
 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 & ADM1293_MFR_STATUS_VAUX_OV_WARN)
 444                                 ret |= PB_VOLTAGE_OV_WARNING;
 445                         if (mfr_status & ADM1293_MFR_STATUS_VAUX_UV_WARN)
 446                                 ret |= PB_VOLTAGE_UV_WARNING;
 447                 }
 448                 break;
 449         default:
 450                 ret = -ENODATA;
 451                 break;
 452         }
 453         return ret;
 454 }
 455
 456 static const struct i2c_device_id adm1275_id[] = {
 457         { "adm1075", adm1075 },
 458         { "adm1272", adm1272 },
 459         { "adm1275", adm1275 },
 460         { "adm1276", adm1276 },
 461         { "adm1278", adm1278 },
 462         { "adm1293", adm1293 },
 463         { "adm1294", adm1294 },
 464         { }
 465 };
 466 MODULE_DEVICE_TABLE(i2c, adm1275_id);
 467
 468 /* Enable VOUT & TEMP1 if not enabled (disabled by default) */
 469 static int adm1275_enable_vout_temp(struct i2c_client *client, int config)
 470 {
 471         int ret;
 472
 473         if ((config & ADM1278_PMON_DEFCONFIG) != ADM1278_PMON_DEFCONFIG) {
 474                 config |= ADM1278_PMON_DEFCONFIG;
 475                 ret = i2c_smbus_write_word_data(client, ADM1275_PMON_CONFIG, config);
 476                 if (ret < 0) {
 477                         dev_err(&client->dev, "Failed to enable VOUT/TEMP1 monitoring\n");
 478                         return ret;
 479                 }
 480         }
 481         return 0;
 482 }
 483
 484 static int adm1275_probe(struct i2c_client *client)
 485 {
 486         s32 (*config_read_fn)(const struct i2c_client *client, u8 reg);
 487         u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
 488         int config, device_config;
 489         int ret;
 490         struct pmbus_driver_info *info;
 491         struct adm1275_data *data;
 492         const struct i2c_device_id *mid;
 493         const struct coefficients *coefficients;
 494         int vindex = -1, voindex = -1, cindex = -1, pindex = -1;
 495         int tindex = -1;
 496         u32 shunt;
 497         u32 avg;
 498
 499         if (!i2c_check_functionality(client->adapter,
 500                                      I2C_FUNC_SMBUS_READ_BYTE_DATA
 501                                      | I2C_FUNC_SMBUS_BLOCK_DATA))
 502                 return -ENODEV;
 503
 504         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
 505         if (ret < 0) {
 506                 dev_err(&client->dev, "Failed to read Manufacturer ID\n");
 507                 return ret;
 508         }
 509         if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
 510                 dev_err(&client->dev, "Unsupported Manufacturer ID\n");
 511                 return -ENODEV;
 512         }
 513
 514         ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
 515         if (ret < 0) {
 516                 dev_err(&client->dev, "Failed to read Manufacturer Model\n");
 517                 return ret;
 518         }
 519         for (mid = adm1275_id; mid->name[0]; mid++) {
 520                 if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
 521                         break;
 522         }
 523         if (!mid->name[0]) {
 524                 dev_err(&client->dev, "Unsupported device\n");
 525                 return -ENODEV;
 526         }
 527
 528         if (strcmp(client->name, mid->name) != 0)
 529                 dev_notice(&client->dev,
 530                            "Device mismatch: Configured %s, detected %s\n",
 531                            client->name, mid->name);
 532
 533         if (mid->driver_data == adm1272 || mid->driver_data == adm1278 ||
 534             mid->driver_data == adm1293 || mid->driver_data == adm1294)
 535                 config_read_fn = i2c_smbus_read_word_data;
 536         else
 537                 config_read_fn = i2c_smbus_read_byte_data;
 538         config = config_read_fn(client, ADM1275_PMON_CONFIG);
 539         if (config < 0)
 540                 return config;
 541
 542         device_config = config_read_fn(client, ADM1275_DEVICE_CONFIG);
 543         if (device_config < 0)
 544                 return device_config;
 545
 546         data = devm_kzalloc(&client->dev, sizeof(struct adm1275_data),
 547                             GFP_KERNEL);
 548         if (!data)
 549                 return -ENOMEM;
 550
 551         if (of_property_read_u32(client->dev.of_node,
 552                                  "shunt-resistor-micro-ohms", &shunt))
 553                 shunt = 1000; /* 1 mOhm if not set via DT */
 554
 555         if (shunt == 0)
 556                 return -EINVAL;
 557
 558         data->id = mid->driver_data;
 559
 560         info = &data->info;
 561
 562         info->pages = 1;
 563         info->format[PSC_VOLTAGE_IN] = direct;
 564         info->format[PSC_VOLTAGE_OUT] = direct;
 565         info->format[PSC_CURRENT_OUT] = direct;
 566         info->format[PSC_POWER] = direct;
 567         info->format[PSC_TEMPERATURE] = direct;
 568         info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
 569                         PMBUS_HAVE_SAMPLES;
 570
 571         info->read_word_data = adm1275_read_word_data;
 572         info->read_byte_data = adm1275_read_byte_data;
 573         info->write_word_data = adm1275_write_word_data;
 574
 575         switch (data->id) {
 576         case adm1075:
 577                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 578                         data->have_oc_fault = true;
 579                 else
 580                         data->have_uc_fault = true;
 581                 data->have_pin_max = true;
 582                 data->have_vaux_status = true;
 583
 584                 coefficients = adm1075_coefficients;
 585                 vindex = 0;
 586                 switch (config & ADM1075_IRANGE_MASK) {
 587                 case ADM1075_IRANGE_25:
 588                         cindex = 1;
 589                         pindex = 3;
 590                         break;
 591                 case ADM1075_IRANGE_50:
 592                         cindex = 2;
 593                         pindex = 4;
 594                         break;
 595                 default:
 596                         dev_err(&client->dev, "Invalid input current range");
 597                         break;
 598                 }
 599
 600                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 601                   | PMBUS_HAVE_STATUS_INPUT;
 602                 if (config & ADM1275_VIN_VOUT_SELECT)
 603                         info->func[0] |=
 604                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 605                 break;
 606         case adm1272:
 607                 data->have_vout = true;
 608                 data->have_pin_max = true;
 609                 data->have_temp_max = true;
 610                 data->have_power_sampling = true;
 611
 612                 coefficients = adm1272_coefficients;
 613                 vindex = (config & ADM1275_VRANGE) ? 1 : 0;
 614                 cindex = (config & ADM1272_IRANGE) ? 3 : 2;
 615                 /* pindex depends on the combination of the above */
 616                 switch (config & (ADM1275_VRANGE | ADM1272_IRANGE)) {
 617                 case 0:
 618                 default:
 619                         pindex = 4;
 620                         break;
 621                 case ADM1275_VRANGE:
 622                         pindex = 5;
 623                         break;
 624                 case ADM1272_IRANGE:
 625                         pindex = 6;
 626                         break;
 627                 case ADM1275_VRANGE | ADM1272_IRANGE:
 628                         pindex = 7;
 629                         break;
 630                 }
 631                 tindex = 8;
 632
 633                 info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 634                         PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 635                         PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 636
 637                 ret = adm1275_enable_vout_temp(client, config);
 638                 if (ret)
 639                         return ret;
 640
 641                 if (config & ADM1278_VIN_EN)
 642                         info->func[0] |= PMBUS_HAVE_VIN;
 643                 break;
 644         case adm1275:
 645                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 646                         data->have_oc_fault = true;
 647                 else
 648                         data->have_uc_fault = true;
 649                 data->have_vout = true;
 650
 651                 coefficients = adm1275_coefficients;
 652                 vindex = (config & ADM1275_VRANGE) ? 0 : 1;
 653                 cindex = 2;
 654
 655                 if (config & ADM1275_VIN_VOUT_SELECT)
 656                         info->func[0] |=
 657                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 658                 else
 659                         info->func[0] |=
 660                           PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
 661                 break;
 662         case adm1276:
 663                 if (device_config & ADM1275_IOUT_WARN2_SELECT)
 664                         data->have_oc_fault = true;
 665                 else
 666                         data->have_uc_fault = true;
 667                 data->have_vout = true;
 668                 data->have_pin_max = true;
 669
 670                 coefficients = adm1276_coefficients;
 671                 vindex = (config & ADM1275_VRANGE) ? 0 : 1;
 672                 cindex = 2;
 673                 pindex = (config & ADM1275_VRANGE) ? 3 : 4;
 674
 675                 info->func[0] |= PMBUS_HAVE_VIN | PMBUS_HAVE_PIN
 676                   | PMBUS_HAVE_STATUS_INPUT;
 677                 if (config & ADM1275_VIN_VOUT_SELECT)
 678                         info->func[0] |=
 679                           PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 680                 break;
 681         case adm1278:
 682                 data->have_vout = true;
 683                 data->have_pin_max = true;
 684                 data->have_temp_max = true;
 685                 data->have_power_sampling = true;
 686
 687                 coefficients = adm1278_coefficients;
 688                 vindex = 0;
 689                 cindex = 1;
 690                 pindex = 2;
 691                 tindex = 3;
 692
 693                 info->func[0] |= PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT |
 694                         PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
 695                         PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 696
 697                 ret = adm1275_enable_vout_temp(client, config);
 698                 if (ret)
 699                         return ret;
 700
 701                 if (config & ADM1278_VIN_EN)
 702                         info->func[0] |= PMBUS_HAVE_VIN;
 703                 break;
 704         case adm1293:
 705         case adm1294:
 706                 data->have_iout_min = true;
 707                 data->have_pin_min = true;
 708                 data->have_pin_max = true;
 709                 data->have_mfr_vaux_status = true;
 710                 data->have_power_sampling = true;
 711
 712                 coefficients = adm1293_coefficients;
 713
 714                 voindex = 0;
 715                 switch (config & ADM1293_VIN_SEL_MASK) {
 716                 case ADM1293_VIN_SEL_012:       /* 1.2V */
 717                         vindex = 0;
 718                         break;
 719                 case ADM1293_VIN_SEL_074:       /* 7.4V */
 720                         vindex = 1;
 721                         break;
 722                 case ADM1293_VIN_SEL_210:       /* 21V */
 723                         vindex = 2;
 724                         break;
 725                 default:                        /* disabled */
 726                         break;
 727                 }
 728
 729                 switch (config & ADM1293_IRANGE_MASK) {
 730                 case ADM1293_IRANGE_25:
 731                         cindex = 3;
 732                         break;
 733                 case ADM1293_IRANGE_50:
 734                         cindex = 4;
 735                         break;
 736                 case ADM1293_IRANGE_100:
 737                         cindex = 5;
 738                         break;
 739                 case ADM1293_IRANGE_200:
 740                         cindex = 6;
 741                         break;
 742                 }
 743
 744                 if (vindex >= 0)
 745                         pindex = 7 + vindex * 4 + (cindex - 3);
 746
 747                 if (config & ADM1293_VAUX_EN)
 748                         info->func[0] |=
 749                                 PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 750
 751                 info->func[0] |= PMBUS_HAVE_PIN |
 752                         PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT;
 753
 754                 break;
 755         default:
 756                 dev_err(&client->dev, "Unsupported device\n");
 757                 return -ENODEV;
 758         }
 759
 760         if (data->have_power_sampling &&
 761             of_property_read_u32(client->dev.of_node,
 762                                  "adi,power-sample-average", &avg) == 0) {
 763                 if (!avg || avg > ADM1275_SAMPLES_AVG_MAX ||
 764                     BIT(__fls(avg)) != avg) {
 765                         dev_err(&client->dev,
 766                                 "Invalid number of power samples");
 767                         return -EINVAL;
 768                 }
 769                 ret = adm1275_write_pmon_config(data, client, true,
 770                                                 ilog2(avg));
 771                 if (ret < 0) {
 772                         dev_err(&client->dev,
 773                                 "Setting power sample averaging failed with error %d",
 774                                 ret);
 775                         return ret;
 776                 }
 777         }
 778
 779         if (of_property_read_u32(client->dev.of_node,
 780                                 "adi,volt-curr-sample-average", &avg) == 0) {
 781                 if (!avg || avg > ADM1275_SAMPLES_AVG_MAX ||
 782                     BIT(__fls(avg)) != avg) {
 783                         dev_err(&client->dev,
 784                                 "Invalid number of voltage/current samples");
 785                         return -EINVAL;
 786                 }
 787                 ret = adm1275_write_pmon_config(data, client, false,
 788                                                 ilog2(avg));
 789                 if (ret < 0) {
 790                         dev_err(&client->dev,
 791                                 "Setting voltage and current sample averaging failed with error %d",
 792                                 ret);
 793                         return ret;
 794                 }
 795         }
 796
 797         if (voindex < 0)
 798                 voindex = vindex;
 799         if (vindex >= 0) {
 800                 info->m[PSC_VOLTAGE_IN] = coefficients[vindex].m;
 801                 info->b[PSC_VOLTAGE_IN] = coefficients[vindex].b;
 802                 info->R[PSC_VOLTAGE_IN] = coefficients[vindex].R;
 803         }
 804         if (voindex >= 0) {
 805                 info->m[PSC_VOLTAGE_OUT] = coefficients[voindex].m;
 806                 info->b[PSC_VOLTAGE_OUT] = coefficients[voindex].b;
 807                 info->R[PSC_VOLTAGE_OUT] = coefficients[voindex].R;
 808         }
 809         if (cindex >= 0) {
 810                 /* Scale current with sense resistor value */
 811                 info->m[PSC_CURRENT_OUT] =
 812                         coefficients[cindex].m * shunt / 1000;
 813                 info->b[PSC_CURRENT_OUT] = coefficients[cindex].b;
 814                 info->R[PSC_CURRENT_OUT] = coefficients[cindex].R;
 815         }
 816         if (pindex >= 0) {
 817                 info->m[PSC_POWER] =
 818                         coefficients[pindex].m * shunt / 1000;
 819                 info->b[PSC_POWER] = coefficients[pindex].b;
 820                 info->R[PSC_POWER] = coefficients[pindex].R;
 821         }
 822         if (tindex >= 0) {
 823                 info->m[PSC_TEMPERATURE] = coefficients[tindex].m;
 824                 info->b[PSC_TEMPERATURE] = coefficients[tindex].b;
 825                 info->R[PSC_TEMPERATURE] = coefficients[tindex].R;
 826         }
 827
 828         return pmbus_do_probe(client, info);
 829 }
 830
 831 static struct i2c_driver adm1275_driver = {
 832         .driver = {
 833                    .name = "adm1275",
 834                    },
 835         .probe_new = adm1275_probe,
 836         .remove = pmbus_do_remove,
 837         .id_table = adm1275_id,
 838 };
 839
 840 module_i2c_driver(adm1275_driver);
 841
 842 MODULE_AUTHOR("Guenter Roeck");
 843 MODULE_DESCRIPTION("PMBus driver for Analog Devices ADM1275 and compatibles");
 844 MODULE_LICENSE("GPL");