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/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, lm25063, lm25066, lm5064, lm5066 };
  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 /* LM25063 only */
  57
  58 #define LM25063_READ_VOUT_MAX           0xe5
  59 #define LM25063_READ_VOUT_MIN           0xe6
  60
  61 struct __coeff {
  62         short m, b, R;
  63 };
  64
  65 #define PSC_CURRENT_IN_L        (PSC_NUM_CLASSES)
  66 #define PSC_POWER_L             (PSC_NUM_CLASSES + 1)
  67
  68 static struct __coeff lm25066_coeff[5][PSC_NUM_CLASSES + 2] = {
  69         [lm25056] = {
  70                 [PSC_VOLTAGE_IN] = {
  71                         .m = 16296,
  72                         .R = -2,
  73                 },
  74                 [PSC_CURRENT_IN] = {
  75                         .m = 13797,
  76                         .R = -2,
  77                 },
  78                 [PSC_CURRENT_IN_L] = {
  79                         .m = 6726,
  80                         .R = -2,
  81                 },
  82                 [PSC_POWER] = {
  83                         .m = 5501,
  84                         .R = -3,
  85                 },
  86                 [PSC_POWER_L] = {
  87                         .m = 26882,
  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                         .R = -2,
 100                 },
 101                 [PSC_VOLTAGE_OUT] = {
 102                         .m = 22070,
 103                         .R = -2,
 104                 },
 105                 [PSC_CURRENT_IN] = {
 106                         .m = 13661,
 107                         .R = -2,
 108                 },
 109                 [PSC_CURRENT_IN_L] = {
 110                         .m = 6852,
 111                         .R = -2,
 112                 },
 113                 [PSC_POWER] = {
 114                         .m = 736,
 115                         .R = -2,
 116                 },
 117                 [PSC_POWER_L] = {
 118                         .m = 369,
 119                         .R = -2,
 120                 },
 121                 [PSC_TEMPERATURE] = {
 122                         .m = 16,
 123                 },
 124         },
 125         [lm25063] = {
 126                 [PSC_VOLTAGE_IN] = {
 127                         .m = 16000,
 128                         .R = -2,
 129                 },
 130                 [PSC_VOLTAGE_OUT] = {
 131                         .m = 16000,
 132                         .R = -2,
 133                 },
 134                 [PSC_CURRENT_IN] = {
 135                         .m = 10000,
 136                         .R = -2,
 137                 },
 138                 [PSC_CURRENT_IN_L] = {
 139                         .m = 10000,
 140                         .R = -2,
 141                 },
 142                 [PSC_POWER] = {
 143                         .m = 5000,
 144                         .R = -3,
 145                 },
 146                 [PSC_POWER_L] = {
 147                         .m = 5000,
 148                         .R = -3,
 149                 },
 150                 [PSC_TEMPERATURE] = {
 151                         .m = 15596,
 152                         .R = -3,
 153                 },
 154         },
 155         [lm5064] = {
 156                 [PSC_VOLTAGE_IN] = {
 157                         .m = 4611,
 158                         .R = -2,
 159                 },
 160                 [PSC_VOLTAGE_OUT] = {
 161                         .m = 4621,
 162                         .R = -2,
 163                 },
 164                 [PSC_CURRENT_IN] = {
 165                         .m = 10742,
 166                         .R = -2,
 167                 },
 168                 [PSC_CURRENT_IN_L] = {
 169                         .m = 5456,
 170                         .R = -2,
 171                 },
 172                 [PSC_POWER] = {
 173                         .m = 1204,
 174                         .R = -3,
 175                 },
 176                 [PSC_POWER_L] = {
 177                         .m = 612,
 178                         .R = -3,
 179                 },
 180                 [PSC_TEMPERATURE] = {
 181                         .m = 16,
 182                 },
 183         },
 184         [lm5066] = {
 185                 [PSC_VOLTAGE_IN] = {
 186                         .m = 4587,
 187                         .R = -2,
 188                 },
 189                 [PSC_VOLTAGE_OUT] = {
 190                         .m = 4587,
 191                         .R = -2,
 192                 },
 193                 [PSC_CURRENT_IN] = {
 194                         .m = 10753,
 195                         .R = -2,
 196                 },
 197                 [PSC_CURRENT_IN_L] = {
 198                         .m = 5405,
 199                         .R = -2,
 200                 },
 201                 [PSC_POWER] = {
 202                         .m = 1204,
 203                         .R = -3,
 204                 },
 205                 [PSC_POWER_L] = {
 206                         .m = 605,
 207                         .R = -3,
 208                 },
 209                 [PSC_TEMPERATURE] = {
 210                         .m = 16,
 211                 },
 212         },
 213 };
 214
 215 struct lm25066_data {
 216         int id;
 217         u16 rlimit;                     /* Maximum register value */
 218         struct pmbus_driver_info info;
 219 };
 220
 221 #define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)
 222
 223 static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
 224 {
 225         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 226         const struct lm25066_data *data = to_lm25066_data(info);
 227         int ret;
 228
 229         switch (reg) {
 230         case PMBUS_VIRT_READ_VMON:
 231                 ret = pmbus_read_word_data(client, 0, LM25066_READ_VAUX);
 232                 if (ret < 0)
 233                         break;
 234                 /* Adjust returned value to match VIN coefficients */
 235                 switch (data->id) {
 236                 case lm25056:
 237                         /* VIN: 6.14 mV VAUX: 293 uV LSB */
 238                         ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 239                         break;
 240                 case lm25063:
 241                         /* VIN: 6.25 mV VAUX: 200.0 uV LSB */
 242                         ret = DIV_ROUND_CLOSEST(ret * 20, 625);
 243                         break;
 244                 case lm25066:
 245                         /* VIN: 4.54 mV VAUX: 283.2 uV LSB */
 246                         ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
 247                         break;
 248                 case lm5064:
 249                         /* VIN: 4.53 mV VAUX: 700 uV LSB */
 250                         ret = DIV_ROUND_CLOSEST(ret * 70, 453);
 251                         break;
 252                 case lm5066:
 253                         /* VIN: 2.18 mV VAUX: 725 uV LSB */
 254                         ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
 255                         break;
 256                 }
 257                 break;
 258         case PMBUS_READ_IIN:
 259                 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
 260                 break;
 261         case PMBUS_READ_PIN:
 262                 ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
 263                 break;
 264         case PMBUS_IIN_OC_WARN_LIMIT:
 265                 ret = pmbus_read_word_data(client, 0,
 266                                            LM25066_MFR_IIN_OC_WARN_LIMIT);
 267                 break;
 268         case PMBUS_PIN_OP_WARN_LIMIT:
 269                 ret = pmbus_read_word_data(client, 0,
 270                                            LM25066_MFR_PIN_OP_WARN_LIMIT);
 271                 break;
 272         case PMBUS_VIRT_READ_VIN_AVG:
 273                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
 274                 break;
 275         case PMBUS_VIRT_READ_VOUT_AVG:
 276                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
 277                 break;
 278         case PMBUS_VIRT_READ_IIN_AVG:
 279                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
 280                 break;
 281         case PMBUS_VIRT_READ_PIN_AVG:
 282                 ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
 283                 break;
 284         case PMBUS_VIRT_READ_PIN_MAX:
 285                 ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
 286                 break;
 287         case PMBUS_VIRT_RESET_PIN_HISTORY:
 288                 ret = 0;
 289                 break;
 290         default:
 291                 ret = -ENODATA;
 292                 break;
 293         }
 294         return ret;
 295 }
 296
 297 static int lm25063_read_word_data(struct i2c_client *client, int page, int reg)
 298 {
 299         int ret;
 300
 301         switch (reg) {
 302         case PMBUS_VIRT_READ_VOUT_MAX:
 303                 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MAX);
 304                 break;
 305         case PMBUS_VIRT_READ_VOUT_MIN:
 306                 ret = pmbus_read_word_data(client, 0, LM25063_READ_VOUT_MIN);
 307                 break;
 308         default:
 309                 ret = lm25066_read_word_data(client, page, reg);
 310                 break;
 311         }
 312         return ret;
 313 }
 314
 315 static int lm25056_read_word_data(struct i2c_client *client, int page, int reg)
 316 {
 317         int ret;
 318
 319         switch (reg) {
 320         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 321                 ret = pmbus_read_word_data(client, 0,
 322                                            LM25056_VAUX_UV_WARN_LIMIT);
 323                 if (ret < 0)
 324                         break;
 325                 /* Adjust returned value to match VIN coefficients */
 326                 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 327                 break;
 328         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 329                 ret = pmbus_read_word_data(client, 0,
 330                                            LM25056_VAUX_OV_WARN_LIMIT);
 331                 if (ret < 0)
 332                         break;
 333                 /* Adjust returned value to match VIN coefficients */
 334                 ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
 335                 break;
 336         default:
 337                 ret = lm25066_read_word_data(client, page, reg);
 338                 break;
 339         }
 340         return ret;
 341 }
 342
 343 static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
 344 {
 345         int ret, s;
 346
 347         switch (reg) {
 348         case PMBUS_VIRT_STATUS_VMON:
 349                 ret = pmbus_read_byte_data(client, 0,
 350                                            PMBUS_STATUS_MFR_SPECIFIC);
 351                 if (ret < 0)
 352                         break;
 353                 s = 0;
 354                 if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
 355                         s |= PB_VOLTAGE_UV_WARNING;
 356                 if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
 357                         s |= PB_VOLTAGE_OV_WARNING;
 358                 ret = s;
 359                 break;
 360         default:
 361                 ret = -ENODATA;
 362                 break;
 363         }
 364         return ret;
 365 }
 366
 367 static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
 368                                    u16 word)
 369 {
 370         const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
 371         const struct lm25066_data *data = to_lm25066_data(info);
 372         int ret;
 373
 374         switch (reg) {
 375         case PMBUS_POUT_OP_FAULT_LIMIT:
 376         case PMBUS_POUT_OP_WARN_LIMIT:
 377         case PMBUS_VOUT_UV_WARN_LIMIT:
 378         case PMBUS_OT_FAULT_LIMIT:
 379         case PMBUS_OT_WARN_LIMIT:
 380         case PMBUS_IIN_OC_FAULT_LIMIT:
 381         case PMBUS_VIN_UV_WARN_LIMIT:
 382         case PMBUS_VIN_UV_FAULT_LIMIT:
 383         case PMBUS_VIN_OV_FAULT_LIMIT:
 384         case PMBUS_VIN_OV_WARN_LIMIT:
 385                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 386                 ret = pmbus_write_word_data(client, 0, reg, word);
 387                 pmbus_clear_cache(client);
 388                 break;
 389         case PMBUS_IIN_OC_WARN_LIMIT:
 390                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 391                 ret = pmbus_write_word_data(client, 0,
 392                                             LM25066_MFR_IIN_OC_WARN_LIMIT,
 393                                             word);
 394                 pmbus_clear_cache(client);
 395                 break;
 396         case PMBUS_PIN_OP_WARN_LIMIT:
 397                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 398                 ret = pmbus_write_word_data(client, 0,
 399                                             LM25066_MFR_PIN_OP_WARN_LIMIT,
 400                                             word);
 401                 pmbus_clear_cache(client);
 402                 break;
 403         case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
 404                 /* Adjust from VIN coefficients (for LM25056) */
 405                 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
 406                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 407                 ret = pmbus_write_word_data(client, 0,
 408                                             LM25056_VAUX_UV_WARN_LIMIT, word);
 409                 pmbus_clear_cache(client);
 410                 break;
 411         case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
 412                 /* Adjust from VIN coefficients (for LM25056) */
 413                 word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
 414                 word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
 415                 ret = pmbus_write_word_data(client, 0,
 416                                             LM25056_VAUX_OV_WARN_LIMIT, word);
 417                 pmbus_clear_cache(client);
 418                 break;
 419         case PMBUS_VIRT_RESET_PIN_HISTORY:
 420                 ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
 421                 break;
 422         default:
 423                 ret = -ENODATA;
 424                 break;
 425         }
 426         return ret;
 427 }
 428
 429 static int lm25066_probe(struct i2c_client *client,
 430                           const struct i2c_device_id *id)
 431 {
 432         int config;
 433         struct lm25066_data *data;
 434         struct pmbus_driver_info *info;
 435         struct __coeff *coeff;
 436
 437         if (!i2c_check_functionality(client->adapter,
 438                                      I2C_FUNC_SMBUS_READ_BYTE_DATA))
 439                 return -ENODEV;
 440
 441         data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
 442                             GFP_KERNEL);
 443         if (!data)
 444                 return -ENOMEM;
 445
 446         config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
 447         if (config < 0)
 448                 return config;
 449
 450         data->id = id->driver_data;
 451         info = &data->info;
 452
 453         info->pages = 1;
 454         info->format[PSC_VOLTAGE_IN] = direct;
 455         info->format[PSC_VOLTAGE_OUT] = direct;
 456         info->format[PSC_CURRENT_IN] = direct;
 457         info->format[PSC_TEMPERATURE] = direct;
 458         info->format[PSC_POWER] = direct;
 459
 460         info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
 461           | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
 462           | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
 463
 464         if (data->id == lm25056) {
 465                 info->func[0] |= PMBUS_HAVE_STATUS_VMON;
 466                 info->read_word_data = lm25056_read_word_data;
 467                 info->read_byte_data = lm25056_read_byte_data;
 468                 data->rlimit = 0x0fff;
 469         } else if (data->id == lm25063) {
 470                 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 471                   | PMBUS_HAVE_POUT;
 472                 info->read_word_data = lm25063_read_word_data;
 473                 data->rlimit = 0xffff;
 474         } else {
 475                 info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
 476                 info->read_word_data = lm25066_read_word_data;
 477                 data->rlimit = 0x0fff;
 478         }
 479         info->write_word_data = lm25066_write_word_data;
 480
 481         coeff = &lm25066_coeff[data->id][0];
 482         info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
 483         info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
 484         info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
 485         info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
 486         info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
 487         info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
 488         info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
 489         info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
 490         info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
 491         info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
 492         info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
 493         info->b[PSC_POWER] = coeff[PSC_POWER].b;
 494         info->R[PSC_POWER] = coeff[PSC_POWER].R;
 495         if (config & LM25066_DEV_SETUP_CL) {
 496                 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
 497                 info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
 498         } else {
 499                 info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
 500                 info->m[PSC_POWER] = coeff[PSC_POWER].m;
 501         }
 502
 503         return pmbus_do_probe(client, id, info);
 504 }
 505
 506 static const struct i2c_device_id lm25066_id[] = {
 507         {"lm25056", lm25056},
 508         {"lm25063", lm25063},
 509         {"lm25066", lm25066},
 510         {"lm5064", lm5064},
 511         {"lm5066", lm5066},
 512         { }
 513 };
 514
 515 MODULE_DEVICE_TABLE(i2c, lm25066_id);
 516
 517 /* This is the driver that will be inserted */
 518 static struct i2c_driver lm25066_driver = {
 519         .driver = {
 520                    .name = "lm25066",
 521                    },
 522         .probe = lm25066_probe,
 523         .remove = pmbus_do_remove,
 524         .id_table = lm25066_id,
 525 };
 526
 527 module_i2c_driver(lm25066_driver);
 528
 529 MODULE_AUTHOR("Guenter Roeck");
 530 MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
 531 MODULE_LICENSE("GPL");