drivers/hwmon/pmbus/lm25066.c

   1 /*
   2  * Hardware monitoring driver for LM25056 / LM25066 / LM5064 / LM5066
   3  *
   4  * Copyright (c) 2011 Ericsson AB.
   5  * Copyright (c) 2013 Guenter Roeck
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/bitops.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/err.h>
  27 #include <linux/slab.h>
  28 #include <linux/i2c.h>
  29 #include "pmbus.h"
  30
  31 enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i };
  32
  33 #define LM25066_READ_VAUX               0xd0
  34 #define LM25066_MFR_READ_IIN            0xd1
  35 #define LM25066_MFR_READ_PIN            0xd2
  36 #define LM25066_MFR_IIN_OC_WARN_LIMIT   0xd3
  37 #define LM25066_MFR_PIN_OP_WARN_LIMIT   0xd4
  38 #define LM25066_READ_PIN_PEAK           0xd5
  39 #define LM25066_CLEAR_PIN_PEAK          0xd6
  40 #define LM25066_DEVICE_SETUP            0xd9
  41 #define LM25066_READ_AVG_VIN            0xdc
  42 #define LM25066_READ_AVG_VOUT           0xdd
  43 #define LM25066_READ_AVG_IIN            0xde
  44 #define LM25066_READ_AVG_PIN            0xdf
  45
  46 #define LM25066_DEV_SETUP_CL            BIT(4)  /* Current limit */
  47
  48 /* LM25056 only */
  49
  50 #define LM25056_VAUX_OV_WARN_LIMIT      0xe3
  51 #define LM25056_VAUX_UV_WARN_LIMIT      0xe4
  52
  53 #define LM25056_MFR_STS_VAUX_OV_WARN    BIT(1)
  54 #define LM25056_MFR_STS_VAUX_UV_WARN    BIT(0)
  55
  56 struct __coeff {
  57         short m, b, R;
  58 };
  59
  60 #define PSC_CURRENT_IN_L        (PSC_NUM_CLASSES)
  61 #define PSC_POWER_L             (PSC_NUM_CLASSES + 1)
  62
  63 static struct __coeff lm25066_coeff[][PSC_NUM_CLASSES + 2] = {
  64         [lm25056] = {
  65                 [PSC_VOLTAGE_IN] = {
  66                         .m = 16296,
  67                         .b = 1343,
  68                         .R = -2,
  69                 },
  70                 [PSC_CURRENT_IN] = {
  71                         .m = 13797,
  72                         .b = -1833,
  73                         .R = -2,
  74                 },
  75                 [PSC_CURRENT_IN_L] = {
  76                         .m = 6726,
  77                         .b = -537,
  78                         .R = -2,
  79                 },
  80                 [PSC_POWER] = {
  81                         .m = 5501,
  82                         .b = -2908,
  83                         .R = -3,
  84                 },
  85                 [PSC_POWER_L] = {
  86                         .m = 26882,
  87                         .b = -5646,
  88                         .R = -4,
  89                 },
  90                 [PSC_TEMPERATURE] = {
  91                         .m = 1580,
  92                         .b = -14500,
  93                         .R = -2,
  94                 },
  95         },
  96         [lm25066] = {
  97                 [PSC_VOLTAGE_IN] = {
  98                         .m = 22070,
  99                         .b = -1800,
 100                         .R = -2,
 101                 },
 102                 [PSC_VOLTAGE_OUT] = {
 103                         .m = 22070,
 104                         .b = -1800,
 105                         .R = -2,
 106                 },
 107                 [PSC_CURRENT_IN] = {
 108                         .m = 13661,
 109                         .b = -5200,
 110                         .R = -2,
 111                 },
 112                 [PSC_CURRENT_IN_L] = {
 113                         .m = 6852,
 114                         .b = -3100,
 115                         .R = -2,
 116                 },
 117                 [PSC_POWER] = {
 118                         .m = 736,
 119                         .b = -3300,
 120                         .R = -2,
 121                 },
 122                 [PSC_POWER_L] = {
 123                         .m = 369,
 124                         .b = -1900,
 125                         .R = -2,
 126                 },
 127                 [PSC_TEMPERATURE] = {
 128                         .m = 16,
 129                 },
 130         },
 131         [lm5064] = {
 132                 [PSC_VOLTAGE_IN] = {
 133                         .m = 4611,
 134                         .b = -642,
 135                         .R = -2,
 136                 },
 137                 [PSC_VOLTAGE_OUT] = {
 138                         .m = 4621,
 139                         .b = 423,
 140                         .R = -2,
 141                 },
 142                 [PSC_CURRENT_IN] = {
 143                         .m = 10742,
 144                         .b = 1552,
 145                         .R = -2,
 146                 },
 147                 [PSC_CURRENT_IN_L] = {
 148                         .m = 5456,
 149                         .b = 2118,
 150                         .R = -2,
 151                 },
 152                 [PSC_POWER] = {
 153                         .m = 1204,
 154                         .b = 8524,
 155                         .R = -3,
 156                 },
 157                 [PSC_POWER_L] = {
 158                         .m = 612,
 159                         .b = 11202,
 160                         .R = -3,
 161                 },
 162                 [PSC_TEMPERATURE] = {
 163                         .m = 16,
 164                 },
 165         },
 166         [lm5066] = {
 167                 [PSC_VOLTAGE_IN] = {
 168                         .m = 4587,
 169                         .b = -1200,
 170                         .R = -2,
 171                 },
 172                 [PSC_VOLTAGE_OUT] = {
 173                         .m = 4587,
 174                         .b = -2400,
 175                         .R = -2,
 176                 },
 177                 [PSC_CURRENT_IN] = {
 178                         .m = 10753,
 179                         .b = -1200,
 180                         .R = -2,
 181                 },
 182                 [PSC_CURRENT_IN_L] = {
 183                         .m = 5405,
 184                         .b = -600,
 185                         .R = -2,
 186                 },
 187                 [PSC_POWER] = {
 188                         .m = 1204,
 189                         .b = -6000,
 190                         .R = -3,
 191                 },
 192                 [PSC_POWER_L] = {
 193                         .m = 605,
 194                         .b = -8000,
 195                         .R = -3,
 196                 },
 197                 [PSC_TEMPERATURE] = {
 198                         .m = 16,
 199                 },
 200         },
 201         [lm5066i] = {
 202                 [PSC_VOLTAGE_IN] = {
 203                         .m = 4617,
 204                         .b = -140,
 205                         .R = -2,
 206                 },
 207                 [PSC_VOLTAGE_OUT] = {
 208                         .m = 4602,
 209                         .b = 500,
 210                         .R = -2,
 211                 },
 212                 [PSC_CURRENT_IN] = {
 213                         .m = 15076,
 214                         .b = -504,
 215                         .R = -2,
 216                 },
 217                 [PSC_CURRENT_IN_L] = {
 218                         .m = 7645,
 219                         .b = 100,
 220                         .R = -2,
 221                 },
 222                 [PSC_POWER] = {
 223                         .m = 1701,
 224                         .b = -4000,
 225                         .R = -3,
 226                 },
 227                 [PSC_POWER_L] = {
 228                         .m = 861,
 229                         .b = -965,
 230                         .R = -3,
 231                 },
 232                 [PSC_TEMPERATURE] = {
 233                         .m = 16,
 234                 },
 235         },
 236 };
 237
 238 struct lm25066_data {
 239         int id;
 240         u16 rlimit;                     /* Maximum register value */
 241         struct pmbus_driver_info info;
 242 };
 243
 244 #define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)
 245
 246 static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
 247 {
 248         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 249         const struct lm25066_data *data = to_lm25066_data(info);
 250         int ret;
 251
 252         switch (reg) {
 253         case PMBUS_VIRT_READ_VMON:
 254                 ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
 255                 if (ret < 0)
 256                         break;
 257                 /* Adjust returned value to match VIN coefficients */
 258                 switch (data->id) {
 259                 case lm25056:
 260                         /* VIN: 6.14 mV VAUX: 293 uV LSB */
 261                         ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 262                         break;
 263                 case lm25066:
 264                         /* VIN: 4.54 mV VAUX: 283.2 uV LSB */
 265                         ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
 266                         break;
 267                 case lm5064:
 268                         /* VIN: 4.53 mV VAUX: 700 uV LSB */
 269                         ret = DIV_ROUND_CLOSEST(ret * 70, 453);
 270                         break;
 271                 case lm5066:
 272                 case lm5066i:
 273                         /* VIN: 2.18 mV VAUX: 725 uV LSB */
 274                         ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
 275                         break;
 276                 }
 277                 break;
 278         case PMBUS_READ_IIN:
 279                 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
 280                 break;
 281         case PMBUS_READ_PIN:
 282                 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
 283                 break;
 284         case PMBUS_IIN_OC_WARN_LIMIT:
 285                 ret = pmbus_read_word_data(client, 0,
 286                                            LM25066_MFR_IIN_OC_WARN_LIMIT);
 287                 break;
 288         case PMBUS_PIN_OP_WARN_LIMIT:
 289                 ret = pmbus_read_word_data(client, 0,
 290                                            LM25066_MFR_PIN_OP_WARN_LIMIT);
 291                 break;
 292         case PMBUS_VIRT_READ_VIN_AVG:
 293                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
 294                 break;
 295         case PMBUS_VIRT_READ_VOUT_AVG:
 296                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
 297                 break;
 298         case PMBUS_VIRT_READ_IIN_AVG:
 299                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
 300                 break;
 301         case PMBUS_VIRT_READ_PIN_AVG:
 302                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
 303                 break;
 304         case PMBUS_VIRT_READ_PIN_MAX:
 305                 ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
 306                 break;
 307         case PMBUS_VIRT_RESET_PIN_HISTORY:
 308                 ret = 0;
 309                 break;
 310         default:
 311                 ret = -ENODATA;
 312                 break;
 313         }
 314         return ret;
 315 }
 316
 317 static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
 318 {
 319         int ret;
 320
 321         switch (reg) {
 322         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 323                 ret = pmbus_read_word_data(client, 0,
 324                                            LM25056_VAUX_UV_WARN_LIMIT);
 325                 if (ret < 0)
 326                         break;
 327                 /* Adjust returned value to match VIN coefficients */
 328                 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 329                 break;
 330         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 331                 ret = pmbus_read_word_data(client, 0,
 332                                            LM25056_VAUX_OV_WARN_LIMIT);
 333                 if (ret < 0)
 334                         break;
 335                 /* Adjust returned value to match VIN coefficients */
 336                 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 337                 break;
 338         default:
 339                 ret = lm25066_read_word_data(client, page, reg);
 340                 break;
 341         }
 342         return ret;
 343 }
 344
 345 static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
 346 {
 347         int ret, s;
 348
 349         switch (reg) {
 350         case PMBUS_VIRT_STATUS_VMON:
 351                 ret = pmbus_read_byte_data(client, 0,
 352                                            PMBUS_STATUS_MFR_SPECIFIC);
 353                 if (ret < 0)
 354                         break;
 355                 s = 0;
 356                 if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
 357                         s |= PB_VOLTAGE_UV_WARNING;
 358                 if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
 359                         s |= PB_VOLTAGE_OV_WARNING;
 360                 ret = s;
 361                 break;
 362         default:
 363                 ret = -ENODATA;
 364                 break;
 365         }
 366         return ret;
 367 }
 368
 369 static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
 370                                    u16 word)
 371 {
 372         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 373         const struct lm25066_data *data = to_lm25066_data(info);
 374         int ret;
 375
 376         switch (reg) {
 377         case PMBUS_POUT_OP_FAULT_LIMIT:
 378         case PMBUS_POUT_OP_WARN_LIMIT:
 379         case PMBUS_VOUT_UV_WARN_LIMIT:
 380         case PMBUS_OT_FAULT_LIMIT:
 381         case PMBUS_OT_WARN_LIMIT:
 382         case PMBUS_IIN_OC_FAULT_LIMIT:
 383         case PMBUS_VIN_UV_WARN_LIMIT:
 384         case PMBUS_VIN_UV_FAULT_LIMIT:
 385         case PMBUS_VIN_OV_FAULT_LIMIT:
 386         case PMBUS_VIN_OV_WARN_LIMIT:
 387                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 388                 ret = pmbus_write_word_data(client, 0, reg, word);
 389                 pmbus_clear_cache(client);
 390                 break;
 391         case PMBUS_IIN_OC_WARN_LIMIT:
 392                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 393                 ret = pmbus_write_word_data(client, 0,
 394                                             LM25066_MFR_IIN_OC_WARN_LIMIT,
 395                                             word);
 396                 pmbus_clear_cache(client);
 397                 break;
 398         case PMBUS_PIN_OP_WARN_LIMIT:
 399                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 400                 ret = pmbus_write_word_data(client, 0,
 401                                             LM25066_MFR_PIN_OP_WARN_LIMIT,
 402                                             word);
 403                 pmbus_clear_cache(client);
 404                 break;
 405         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 406                 /* Adjust from VIN coefficients (for LM25056) */
 407                 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
 408                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 409                 ret = pmbus_write_word_data(client, 0,
 410                                             LM25056_VAUX_UV_WARN_LIMIT, word);
 411                 pmbus_clear_cache(client);
 412                 break;
 413         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 414                 /* Adjust from VIN coefficients (for LM25056) */
 415                 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
 416                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 417                 ret = pmbus_write_word_data(client, 0,
 418                                             LM25056_VAUX_OV_WARN_LIMIT, word);
 419                 pmbus_clear_cache(client);
 420                 break;
 421         case PMBUS_VIRT_RESET_PIN_HISTORY:
 422                 ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
 423                 break;
 424         default:
 425                 ret = -ENODATA;
 426                 break;
 427         }
 428         return ret;
 429 }
 430
 431 static int lm25066_probe(struct i2c_client *client,
 432                           const struct i2c_device_id *id)
 433 {
 434         int config;
 435         struct lm25066_data *data;
 436         struct pmbus_driver_info *info;
 437         struct __coeff *coeff;
 438
 439         if (!i2c_check_functionality(client->adapter,
 440                                      I2C_FUNC_SMBUS_READ_BYTE_DATA))
 441                 return -ENODEV;
 442
 443         data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
 444                             GFP_KERNEL);
 445         if (!data)
 446                 return -ENOMEM;
 447
 448         config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
 449         if (config < 0)
 450                 return config;
 451
 452         data->id = id->driver_data;
 453         info = &data->info;
 454
 455         info->pages = 1;
 456         info->format[PSC_VOLTAGE_IN] = direct;
 457         info->format[PSC_VOLTAGE_OUT] = direct;
 458         info->format[PSC_CURRENT_IN] = direct;
 459         info->format[PSC_TEMPERATURE] = direct;
 460         info->format[PSC_POWER] = direct;
 461
 462         info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
 463           | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
 464           | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 465
 466         if (data->id == lm25056) {
 467                 info->func[0] |= PMBUS_HAVE_STATUS_VMON;
 468                 info->read_word_data = lm25056_read_word_data;
 469                 info->read_byte_data = lm25056_read_byte_data;
 470                 data->rlimit = 0x0fff;
 471         } else {
 472                 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 473                 info->read_word_data = lm25066_read_word_data;
 474                 data->rlimit = 0x0fff;
 475         }
 476         info->write_word_data = lm25066_write_word_data;
 477
 478         coeff = &lm25066_coeff[data->id][0];
 479         info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
 480         info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
 481         info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
 482         info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
 483         info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
 484         info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
 485         info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
 486         info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
 487         info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
 488         info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
 489         info->R[PSC_POWER] = coeff[PSC_POWER].R;
 490         if (config & LM25066_DEV_SETUP_CL) {
 491                 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
 492                 info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].b;
 493                 info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
 494                 info->b[PSC_POWER] = coeff[PSC_POWER_L].b;
 495         } else {
 496                 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
 497                 info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
 498                 info->m[PSC_POWER] = coeff[PSC_POWER].m;
 499                 info->b[PSC_POWER] = coeff[PSC_POWER].b;
 500         }
 501
 502         return pmbus_do_probe(client, id, info);
 503 }
 504
 505 static const struct i2c_device_id lm25066_id[] = {
 506         {"lm25056", lm25056},
 507         {"lm25066", lm25066},
 508         {"lm5064", lm5064},
 509         {"lm5066", lm5066},
 510         {"lm5066i", lm5066i},
 511         { }
 512 };
 513
 514 MODULE_DEVICE_TABLE(i2c, lm25066_id);
 515
 516 /* This is the driver that will be inserted */
 517 static struct i2c_driver lm25066_driver = {
 518         .driver = {
 519                    .name = "lm25066",
 520                    },
 521         .probe = lm25066_probe,
 522         .remove = pmbus_do_remove,
 523         .id_table = lm25066_id,
 524 };
 525
 526 module_i2c_driver(lm25066_driver);
 527
 528 MODULE_AUTHOR("Guenter Roeck");
 529 MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
 530 MODULE_LICENSE("GPL");