kernel/drivers/hwmon/pmbus/lm25066.c

   1 /*
   2  * Hardware monitoring driver for LM25056 / LM25063 / 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/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/err.h>
  26 #include <linux/slab.h>
  27 #include <linux/i2c.h>
  28 #include "pmbus.h"
  29
  30 enum chips { lm25056, lm25063, lm25066, lm5064, lm5066 };
  31
  32 #define LM25066_READ_VAUX               0xd0
  33 #define LM25066_MFR_READ_IIN            0xd1
  34 #define LM25066_MFR_READ_PIN            0xd2
  35 #define LM25066_MFR_IIN_OC_WARN_LIMIT   0xd3
  36 #define LM25066_MFR_PIN_OP_WARN_LIMIT   0xd4
  37 #define LM25066_READ_PIN_PEAK           0xd5
  38 #define LM25066_CLEAR_PIN_PEAK          0xd6
  39 #define LM25066_DEVICE_SETUP            0xd9
  40 #define LM25066_READ_AVG_VIN            0xdc
  41 #define LM25066_READ_AVG_VOUT           0xdd
  42 #define LM25066_READ_AVG_IIN            0xde
  43 #define LM25066_READ_AVG_PIN            0xdf
  44
  45 #define LM25066_DEV_SETUP_CL            (1 << 4)        /* Current limit */
  46
  47 /* LM25056 only */
  48
  49 #define LM25056_VAUX_OV_WARN_LIMIT      0xe3
  50 #define LM25056_VAUX_UV_WARN_LIMIT      0xe4
  51
  52 #define LM25056_MFR_STS_VAUX_OV_WARN    (1 << 1)
  53 #define LM25056_MFR_STS_VAUX_UV_WARN    (1 << 0)
  54
  55 /* LM25063 only */
  56
  57 #define LM25063_READ_VOUT_MAX           0xe5
  58 #define LM25063_READ_VOUT_MIN           0xe6
  59
  60 struct __coeff {
  61         short m, b, R;
  62 };
  63
  64 #define PSC_CURRENT_IN_L        (PSC_NUM_CLASSES)
  65 #define PSC_POWER_L             (PSC_NUM_CLASSES + 1)
  66
  67 static struct __coeff lm25066_coeff[5][PSC_NUM_CLASSES + 2] = {
  68         [lm25056] = {
  69                 [PSC_VOLTAGE_IN] = {
  70                         .m = 16296,
  71                         .R = -2,
  72                 },
  73                 [PSC_CURRENT_IN] = {
  74                         .m = 13797,
  75                         .R = -2,
  76                 },
  77                 [PSC_CURRENT_IN_L] = {
  78                         .m = 6726,
  79                         .R = -2,
  80                 },
  81                 [PSC_POWER] = {
  82                         .m = 5501,
  83                         .R = -3,
  84                 },
  85                 [PSC_POWER_L] = {
  86                         .m = 26882,
  87                         .R = -4,
  88                 },
  89                 [PSC_TEMPERATURE] = {
  90                         .m = 1580,
  91                         .b = -14500,
  92                         .R = -2,
  93                 },
  94         },
  95         [lm25066] = {
  96                 [PSC_VOLTAGE_IN] = {
  97                         .m = 22070,
  98                         .R = -2,
  99                 },
 100                 [PSC_VOLTAGE_OUT] = {
 101                         .m = 22070,
 102                         .R = -2,
 103                 },
 104                 [PSC_CURRENT_IN] = {
 105                         .m = 13661,
 106                         .R = -2,
 107                 },
 108                 [PSC_CURRENT_IN_L] = {
 109                         .m = 6852,
 110                         .R = -2,
 111                 },
 112                 [PSC_POWER] = {
 113                         .m = 736,
 114                         .R = -2,
 115                 },
 116                 [PSC_POWER_L] = {
 117                         .m = 369,
 118                         .R = -2,
 119                 },
 120                 [PSC_TEMPERATURE] = {
 121                         .m = 16,
 122                 },
 123         },
 124         [lm25063] = {
 125                 [PSC_VOLTAGE_IN] = {
 126                         .m = 16000,
 127                         .R = -2,
 128                 },
 129                 [PSC_VOLTAGE_OUT] = {
 130                         .m = 16000,
 131                         .R = -2,
 132                 },
 133                 [PSC_CURRENT_IN] = {
 134                         .m = 10000,
 135                         .R = -2,
 136                 },
 137                 [PSC_CURRENT_IN_L] = {
 138                         .m = 10000,
 139                         .R = -2,
 140                 },
 141                 [PSC_POWER] = {
 142                         .m = 5000,
 143                         .R = -3,
 144                 },
 145                 [PSC_POWER_L] = {
 146                         .m = 5000,
 147                         .R = -3,
 148                 },
 149                 [PSC_TEMPERATURE] = {
 150                         .m = 15596,
 151                         .R = -3,
 152                 },
 153         },
 154         [lm5064] = {
 155                 [PSC_VOLTAGE_IN] = {
 156                         .m = 4611,
 157                         .R = -2,
 158                 },
 159                 [PSC_VOLTAGE_OUT] = {
 160                         .m = 4621,
 161                         .R = -2,
 162                 },
 163                 [PSC_CURRENT_IN] = {
 164                         .m = 10742,
 165                         .R = -2,
 166                 },
 167                 [PSC_CURRENT_IN_L] = {
 168                         .m = 5456,
 169                         .R = -2,
 170                 },
 171                 [PSC_POWER] = {
 172                         .m = 1204,
 173                         .R = -3,
 174                 },
 175                 [PSC_POWER_L] = {
 176                         .m = 612,
 177                         .R = -3,
 178                 },
 179                 [PSC_TEMPERATURE] = {
 180                         .m = 16,
 181                 },
 182         },
 183         [lm5066] = {
 184                 [PSC_VOLTAGE_IN] = {
 185                         .m = 4587,
 186                         .R = -2,
 187                 },
 188                 [PSC_VOLTAGE_OUT] = {
 189                         .m = 4587,
 190                         .R = -2,
 191                 },
 192                 [PSC_CURRENT_IN] = {
 193                         .m = 10753,
 194                         .R = -2,
 195                 },
 196                 [PSC_CURRENT_IN_L] = {
 197                         .m = 5405,
 198                         .R = -2,
 199                 },
 200                 [PSC_POWER] = {
 201                         .m = 1204,
 202                         .R = -3,
 203                 },
 204                 [PSC_POWER_L] = {
 205                         .m = 605,
 206                         .R = -3,
 207                 },
 208                 [PSC_TEMPERATURE] = {
 209                         .m = 16,
 210                 },
 211         },
 212 };
 213
 214 struct lm25066_data {
 215         int id;
 216         u16 rlimit;                     /* Maximum register value */
 217         struct pmbus_driver_info info;
 218 };
 219
 220 #define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)
 221
 222 static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
 223 {
 224         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 225         const struct lm25066_data *data = to_lm25066_data(info);
 226         int ret;
 227
 228         switch (reg) {
 229         case PMBUS_VIRT_READ_VMON:
 230                 ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
 231                 if (ret < 0)
 232                         break;
 233                 /* Adjust returned value to match VIN coefficients */
 234                 switch (data->id) {
 235                 case lm25056:
 236                         /* VIN: 6.14 mV VAUX: 293 uV LSB */
 237                         ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 238                         break;
 239                 case lm25063:
 240                         /* VIN: 6.25 mV VAUX: 200.0 uV LSB */
 241                         ret = DIV_ROUND_CLOSEST(ret * 20, 625);
 242                         break;
 243                 case lm25066:
 244                         /* VIN: 4.54 mV VAUX: 283.2 uV LSB */
 245                         ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
 246                         break;
 247                 case lm5064:
 248                         /* VIN: 4.53 mV VAUX: 700 uV LSB */
 249                         ret = DIV_ROUND_CLOSEST(ret * 70, 453);
 250                         break;
 251                 case lm5066:
 252                         /* VIN: 2.18 mV VAUX: 725 uV LSB */
 253                         ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
 254                         break;
 255                 }
 256                 break;
 257         case PMBUS_READ_IIN:
 258                 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
 259                 break;
 260         case PMBUS_READ_PIN:
 261                 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
 262                 break;
 263         case PMBUS_IIN_OC_WARN_LIMIT:
 264                 ret = pmbus_read_word_data(client, 0,
 265                                            LM25066_MFR_IIN_OC_WARN_LIMIT);
 266                 break;
 267         case PMBUS_PIN_OP_WARN_LIMIT:
 268                 ret = pmbus_read_word_data(client, 0,
 269                                            LM25066_MFR_PIN_OP_WARN_LIMIT);
 270                 break;
 271         case PMBUS_VIRT_READ_VIN_AVG:
 272                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
 273                 break;
 274         case PMBUS_VIRT_READ_VOUT_AVG:
 275                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
 276                 break;
 277         case PMBUS_VIRT_READ_IIN_AVG:
 278                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
 279                 break;
 280         case PMBUS_VIRT_READ_PIN_AVG:
 281                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
 282                 break;
 283         case PMBUS_VIRT_READ_PIN_MAX:
 284                 ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
 285                 break;
 286         case PMBUS_VIRT_RESET_PIN_HISTORY:
 287                 ret = 0;
 288                 break;
 289         default:
 290                 ret = -ENODATA;
 291                 break;
 292         }
 293         return ret;
 294 }
 295
 296 static int lm25063_read_word_data(struct i2c_client *client, int page, int reg)
 297 {
 298         int ret;
 299
 300         switch (reg) {
 301         case PMBUS_VIRT_READ_VOUT_MAX:
 302                 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX);
 303                 break;
 304         case PMBUS_VIRT_READ_VOUT_MIN:
 305                 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN);
 306                 break;
 307         default:
 308                 ret = lm25066_read_word_data(client, page, reg);
 309                 break;
 310         }
 311         return ret;
 312 }
 313
 314 static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
 315 {
 316         int ret;
 317
 318         switch (reg) {
 319         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 320                 ret = pmbus_read_word_data(client, 0,
 321                                            LM25056_VAUX_UV_WARN_LIMIT);
 322                 if (ret < 0)
 323                         break;
 324                 /* Adjust returned value to match VIN coefficients */
 325                 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 326                 break;
 327         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 328                 ret = pmbus_read_word_data(client, 0,
 329                                            LM25056_VAUX_OV_WARN_LIMIT);
 330                 if (ret < 0)
 331                         break;
 332                 /* Adjust returned value to match VIN coefficients */
 333                 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 334                 break;
 335         default:
 336                 ret = lm25066_read_word_data(client, page, reg);
 337                 break;
 338         }
 339         return ret;
 340 }
 341
 342 static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
 343 {
 344         int ret, s;
 345
 346         switch (reg) {
 347         case PMBUS_VIRT_STATUS_VMON:
 348                 ret = pmbus_read_byte_data(client, 0,
 349                                            PMBUS_STATUS_MFR_SPECIFIC);
 350                 if (ret < 0)
 351                         break;
 352                 s = 0;
 353                 if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
 354                         s |= PB_VOLTAGE_UV_WARNING;
 355                 if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
 356                         s |= PB_VOLTAGE_OV_WARNING;
 357                 ret = s;
 358                 break;
 359         default:
 360                 ret = -ENODATA;
 361                 break;
 362         }
 363         return ret;
 364 }
 365
 366 static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
 367                                    u16 word)
 368 {
 369         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 370         const struct lm25066_data *data = to_lm25066_data(info);
 371         int ret;
 372
 373         switch (reg) {
 374         case PMBUS_POUT_OP_FAULT_LIMIT:
 375         case PMBUS_POUT_OP_WARN_LIMIT:
 376         case PMBUS_VOUT_UV_WARN_LIMIT:
 377         case PMBUS_OT_FAULT_LIMIT:
 378         case PMBUS_OT_WARN_LIMIT:
 379         case PMBUS_IIN_OC_FAULT_LIMIT:
 380         case PMBUS_VIN_UV_WARN_LIMIT:
 381         case PMBUS_VIN_UV_FAULT_LIMIT:
 382         case PMBUS_VIN_OV_FAULT_LIMIT:
 383         case PMBUS_VIN_OV_WARN_LIMIT:
 384                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 385                 ret = pmbus_write_word_data(client, 0, reg, word);
 386                 pmbus_clear_cache(client);
 387                 break;
 388         case PMBUS_IIN_OC_WARN_LIMIT:
 389                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 390                 ret = pmbus_write_word_data(client, 0,
 391                                             LM25066_MFR_IIN_OC_WARN_LIMIT,
 392                                             word);
 393                 pmbus_clear_cache(client);
 394                 break;
 395         case PMBUS_PIN_OP_WARN_LIMIT:
 396                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 397                 ret = pmbus_write_word_data(client, 0,
 398                                             LM25066_MFR_PIN_OP_WARN_LIMIT,
 399                                             word);
 400                 pmbus_clear_cache(client);
 401                 break;
 402         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 403                 /* Adjust from VIN coefficients (for LM25056) */
 404                 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
 405                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 406                 ret = pmbus_write_word_data(client, 0,
 407                                             LM25056_VAUX_UV_WARN_LIMIT, word);
 408                 pmbus_clear_cache(client);
 409                 break;
 410         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 411                 /* Adjust from VIN coefficients (for LM25056) */
 412                 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
 413                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 414                 ret = pmbus_write_word_data(client, 0,
 415                                             LM25056_VAUX_OV_WARN_LIMIT, word);
 416                 pmbus_clear_cache(client);
 417                 break;
 418         case PMBUS_VIRT_RESET_PIN_HISTORY:
 419                 ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
 420                 break;
 421         default:
 422                 ret = -ENODATA;
 423                 break;
 424         }
 425         return ret;
 426 }
 427
 428 static int lm25066_probe(struct i2c_client *client,
 429                           const struct i2c_device_id *id)
 430 {
 431         int config;
 432         struct lm25066_data *data;
 433         struct pmbus_driver_info *info;
 434         struct __coeff *coeff;
 435
 436         if (!i2c_check_functionality(client->adapter,
 437                                      I2C_FUNC_SMBUS_READ_BYTE_DATA))
 438                 return -ENODEV;
 439
 440         data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
 441                             GFP_KERNEL);
 442         if (!data)
 443                 return -ENOMEM;
 444
 445         config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
 446         if (config < 0)
 447                 return config;
 448
 449         data->id = id->driver_data;
 450         info = &data->info;
 451
 452         info->pages = 1;
 453         info->format[PSC_VOLTAGE_IN] = direct;
 454         info->format[PSC_VOLTAGE_OUT] = direct;
 455         info->format[PSC_CURRENT_IN] = direct;
 456         info->format[PSC_TEMPERATURE] = direct;
 457         info->format[PSC_POWER] = direct;
 458
 459         info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
 460           | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
 461           | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 462
 463         if (data->id == lm25056) {
 464                 info->func[0] |= PMBUS_HAVE_STATUS_VMON;
 465                 info->read_word_data = lm25056_read_word_data;
 466                 info->read_byte_data = lm25056_read_byte_data;
 467                 data->rlimit = 0x0fff;
 468         } else if (data->id == lm25063) {
 469                 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 470                   | PMBUS_HAVE_POUT;
 471                 info->read_word_data = lm25063_read_word_data;
 472                 data->rlimit = 0xffff;
 473         } else {
 474                 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 475                 info->read_word_data = lm25066_read_word_data;
 476                 data->rlimit = 0x0fff;
 477         }
 478         info->write_word_data = lm25066_write_word_data;
 479
 480         coeff = &lm25066_coeff[data->id][0];
 481         info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
 482         info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
 483         info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
 484         info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
 485         info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
 486         info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
 487         info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
 488         info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
 489         info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
 490         info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
 491         info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
 492         info->b[PSC_POWER] = coeff[PSC_POWER].b;
 493         info->R[PSC_POWER] = coeff[PSC_POWER].R;
 494         if (config & LM25066_DEV_SETUP_CL) {
 495                 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
 496                 info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
 497         } else {
 498                 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
 499                 info->m[PSC_POWER] = coeff[PSC_POWER].m;
 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         {"lm25063", lm25063},
 508         {"lm25066", lm25066},
 509         {"lm5064", lm5064},
 510         {"lm5066", lm5066},
 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");