drivers/hwmon/mlxreg-fan.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2 //
   3 // Copyright (c) 2018 Mellanox Technologies. All rights reserved.
   4 // Copyright (c) 2018 Vadim Pasternak <vadimp@mellanox.com>
   5
   6 #include <linux/bitops.h>
   7 #include <linux/device.h>
   8 #include <linux/hwmon.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_data/mlxreg.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13 #include <linux/thermal.h>
  14
  15 #define MLXREG_FAN_MAX_TACHO            24
  16 #define MLXREG_FAN_MAX_PWM              4
  17 #define MLXREG_FAN_PWM_NOT_CONNECTED    0xff
  18 #define MLXREG_FAN_MAX_STATE            10
  19 #define MLXREG_FAN_MIN_DUTY             51      /* 20% */
  20 #define MLXREG_FAN_MAX_DUTY             255     /* 100% */
  21 #define MLXREG_FAN_SPEED_MIN_LEVEL              2       /* 20 percent */
  22 #define MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF  44
  23 #define MLXREG_FAN_TACHO_DIV_MIN                283
  24 #define MLXREG_FAN_TACHO_DIV_DEF                (MLXREG_FAN_TACHO_DIV_MIN * 4)
  25 #define MLXREG_FAN_TACHO_DIV_SCALE_MAX  64
  26 /*
  27  * FAN datasheet defines the formula for RPM calculations as RPM = 15/t-high.
  28  * The logic in a programmable device measures the time t-high by sampling the
  29  * tachometer every t-sample (with the default value 11.32 uS) and increment
  30  * a counter (N) as long as the pulse has not change:
  31  * RPM = 15 / (t-sample * (K + Regval)), where:
  32  * Regval: is the value read from the programmable device register;
  33  *  - 0xff - represents tachometer fault;
  34  *  - 0xfe - represents tachometer minimum value , which is 4444 RPM;
  35  *  - 0x00 - represents tachometer maximum value , which is 300000 RPM;
  36  * K: is 44 and it represents the minimum allowed samples per pulse;
  37  * N: is equal K + Regval;
  38  * In order to calculate RPM from the register value the following formula is
  39  * used: RPM = 15 / ((Regval + K) * 11.32) * 10^(-6)), which in  the
  40  * default case is modified to:
  41  * RPM = 15000000 * 100 / ((Regval + 44) * 1132);
  42  * - for Regval 0x00, RPM will be 15000000 * 100 / (44 * 1132) = 30115;
  43  * - for Regval 0xfe, RPM will be 15000000 * 100 / ((254 + 44) * 1132) = 4446;
  44  * In common case the formula is modified to:
  45  * RPM = 15000000 * 100 / ((Regval + samples) * divider).
  46  */
  47 #define MLXREG_FAN_GET_RPM(rval, d, s)  (DIV_ROUND_CLOSEST(15000000 * 100, \
  48                                          ((rval) + (s)) * (d)))
  49 #define MLXREG_FAN_GET_FAULT(val, mask) ((val) == (mask))
  50 #define MLXREG_FAN_PWM_DUTY2STATE(duty) (DIV_ROUND_CLOSEST((duty) *     \
  51                                          MLXREG_FAN_MAX_STATE,          \
  52                                          MLXREG_FAN_MAX_DUTY))
  53 #define MLXREG_FAN_PWM_STATE2DUTY(stat) (DIV_ROUND_CLOSEST((stat) *     \
  54                                          MLXREG_FAN_MAX_DUTY,           \
  55                                          MLXREG_FAN_MAX_STATE))
  56
  57 struct mlxreg_fan;
  58
  59 /*
  60  * struct mlxreg_fan_tacho - tachometer data (internal use):
  61  *
  62  * @connected: indicates if tachometer is connected;
  63  * @reg: register offset;
  64  * @mask: fault mask;
  65  * @prsnt: present register offset;
  66  */
  67 struct mlxreg_fan_tacho {
  68         bool connected;
  69         u32 reg;
  70         u32 mask;
  71         u32 prsnt;
  72 };
  73
  74 /*
  75  * struct mlxreg_fan_pwm - PWM data (internal use):
  76  *
  77  * @fan: private data;
  78  * @connected: indicates if PWM is connected;
  79  * @reg: register offset;
  80  * @cooling: cooling device levels;
  81  * @last_hwmon_state: last cooling state set by hwmon subsystem;
  82  * @last_thermal_state: last cooling state set by thermal subsystem;
  83  * @cdev: cooling device;
  84  */
  85 struct mlxreg_fan_pwm {
  86         struct mlxreg_fan *fan;
  87         bool connected;
  88         u32 reg;
  89         unsigned long last_hwmon_state;
  90         unsigned long last_thermal_state;
  91         struct thermal_cooling_device *cdev;
  92 };
  93
  94 /*
  95  * struct mlxreg_fan - private data (internal use):
  96  *
  97  * @dev: basic device;
  98  * @regmap: register map of parent device;
  99  * @tacho: tachometer data;
 100  * @pwm: PWM data;
 101  * @tachos_per_drwr - number of tachometers per drawer;
 102  * @samples: minimum allowed samples per pulse;
 103  * @divider: divider value for tachometer RPM calculation;
 104  */
 105 struct mlxreg_fan {
 106         struct device *dev;
 107         void *regmap;
 108         struct mlxreg_core_platform_data *pdata;
 109         struct mlxreg_fan_tacho tacho[MLXREG_FAN_MAX_TACHO];
 110         struct mlxreg_fan_pwm pwm[MLXREG_FAN_MAX_PWM];
 111         int tachos_per_drwr;
 112         int samples;
 113         int divider;
 114 };
 115
 116 static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
 117                                     unsigned long state);
 118
 119 static int
 120 mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 121                 int channel, long *val)
 122 {
 123         struct mlxreg_fan *fan = dev_get_drvdata(dev);
 124         struct mlxreg_fan_tacho *tacho;
 125         struct mlxreg_fan_pwm *pwm;
 126         u32 regval;
 127         int err;
 128
 129         switch (type) {
 130         case hwmon_fan:
 131                 tacho = &fan->tacho[channel];
 132                 switch (attr) {
 133                 case hwmon_fan_input:
 134                         /*
 135                          * Check FAN presence: FAN related bit in presence register is one,
 136                          * if FAN is physically connected, zero - otherwise.
 137                          */
 138                         if (tacho->prsnt && fan->tachos_per_drwr) {
 139                                 err = regmap_read(fan->regmap, tacho->prsnt, &regval);
 140                                 if (err)
 141                                         return err;
 142
 143                                 /*
 144                                  * Map channel to presence bit - drawer can be equipped with
 145                                  * one or few FANs, while presence is indicated per drawer.
 146                                  */
 147                                 if (BIT(channel / fan->tachos_per_drwr) & regval) {
 148                                         /* FAN is not connected - return zero for FAN speed. */
 149                                         *val = 0;
 150                                         return 0;
 151                                 }
 152                         }
 153
 154                         err = regmap_read(fan->regmap, tacho->reg, &regval);
 155                         if (err)
 156                                 return err;
 157
 158                         if (MLXREG_FAN_GET_FAULT(regval, tacho->mask)) {
 159                                 /* FAN is broken - return zero for FAN speed. */
 160                                 *val = 0;
 161                                 return 0;
 162                         }
 163
 164                         *val = MLXREG_FAN_GET_RPM(regval, fan->divider,
 165                                                   fan->samples);
 166                         break;
 167
 168                 case hwmon_fan_fault:
 169                         err = regmap_read(fan->regmap, tacho->reg, &regval);
 170                         if (err)
 171                                 return err;
 172
 173                         *val = MLXREG_FAN_GET_FAULT(regval, tacho->mask);
 174                         break;
 175
 176                 default:
 177                         return -EOPNOTSUPP;
 178                 }
 179                 break;
 180
 181         case hwmon_pwm:
 182                 pwm = &fan->pwm[channel];
 183                 switch (attr) {
 184                 case hwmon_pwm_input:
 185                         err = regmap_read(fan->regmap, pwm->reg, &regval);
 186                         if (err)
 187                                 return err;
 188
 189                         *val = regval;
 190                         break;
 191
 192                 default:
 193                         return -EOPNOTSUPP;
 194                 }
 195                 break;
 196
 197         default:
 198                 return -EOPNOTSUPP;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static int
 205 mlxreg_fan_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 206                  int channel, long val)
 207 {
 208         struct mlxreg_fan *fan = dev_get_drvdata(dev);
 209         struct mlxreg_fan_pwm *pwm;
 210
 211         switch (type) {
 212         case hwmon_pwm:
 213                 switch (attr) {
 214                 case hwmon_pwm_input:
 215                         if (val < MLXREG_FAN_MIN_DUTY ||
 216                             val > MLXREG_FAN_MAX_DUTY)
 217                                 return -EINVAL;
 218                         pwm = &fan->pwm[channel];
 219                         /* If thermal is configured - handle PWM limit setting. */
 220                         if (IS_REACHABLE(CONFIG_THERMAL)) {
 221                                 pwm->last_hwmon_state = MLXREG_FAN_PWM_DUTY2STATE(val);
 222                                 /*
 223                                  * Update PWM only in case requested state is not less than the
 224                                  * last thermal state.
 225                                  */
 226                                 if (pwm->last_hwmon_state >= pwm->last_thermal_state)
 227                                         return mlxreg_fan_set_cur_state(pwm->cdev,
 228                                                                         pwm->last_hwmon_state);
 229                                 return 0;
 230                         }
 231                         return regmap_write(fan->regmap, pwm->reg, val);
 232                 default:
 233                         return -EOPNOTSUPP;
 234                 }
 235                 break;
 236
 237         default:
 238                 return -EOPNOTSUPP;
 239         }
 240
 241         return -EOPNOTSUPP;
 242 }
 243
 244 static umode_t
 245 mlxreg_fan_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
 246                       int channel)
 247 {
 248         switch (type) {
 249         case hwmon_fan:
 250                 if (!(((struct mlxreg_fan *)data)->tacho[channel].connected))
 251                         return 0;
 252
 253                 switch (attr) {
 254                 case hwmon_fan_input:
 255                 case hwmon_fan_fault:
 256                         return 0444;
 257                 default:
 258                         break;
 259                 }
 260                 break;
 261
 262         case hwmon_pwm:
 263                 if (!(((struct mlxreg_fan *)data)->pwm[channel].connected))
 264                         return 0;
 265
 266                 switch (attr) {
 267                 case hwmon_pwm_input:
 268                         return 0644;
 269                 default:
 270                         break;
 271                 }
 272                 break;
 273
 274         default:
 275                 break;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static char *mlxreg_fan_name[] = {
 282         "mlxreg_fan",
 283         "mlxreg_fan1",
 284         "mlxreg_fan2",
 285         "mlxreg_fan3",
 286 };
 287
 288 static const struct hwmon_channel_info * const mlxreg_fan_hwmon_info[] = {
 289         HWMON_CHANNEL_INFO(fan,
 290                            HWMON_F_INPUT | HWMON_F_FAULT,
 291                            HWMON_F_INPUT | HWMON_F_FAULT,
 292                            HWMON_F_INPUT | HWMON_F_FAULT,
 293                            HWMON_F_INPUT | HWMON_F_FAULT,
 294                            HWMON_F_INPUT | HWMON_F_FAULT,
 295                            HWMON_F_INPUT | HWMON_F_FAULT,
 296                            HWMON_F_INPUT | HWMON_F_FAULT,
 297                            HWMON_F_INPUT | HWMON_F_FAULT,
 298                            HWMON_F_INPUT | HWMON_F_FAULT,
 299                            HWMON_F_INPUT | HWMON_F_FAULT,
 300                            HWMON_F_INPUT | HWMON_F_FAULT,
 301                            HWMON_F_INPUT | HWMON_F_FAULT,
 302                            HWMON_F_INPUT | HWMON_F_FAULT,
 303                            HWMON_F_INPUT | HWMON_F_FAULT,
 304                            HWMON_F_INPUT | HWMON_F_FAULT,
 305                            HWMON_F_INPUT | HWMON_F_FAULT,
 306                            HWMON_F_INPUT | HWMON_F_FAULT,
 307                            HWMON_F_INPUT | HWMON_F_FAULT,
 308                            HWMON_F_INPUT | HWMON_F_FAULT,
 309                            HWMON_F_INPUT | HWMON_F_FAULT,
 310                            HWMON_F_INPUT | HWMON_F_FAULT,
 311                            HWMON_F_INPUT | HWMON_F_FAULT,
 312                            HWMON_F_INPUT | HWMON_F_FAULT,
 313                            HWMON_F_INPUT | HWMON_F_FAULT),
 314         HWMON_CHANNEL_INFO(pwm,
 315                            HWMON_PWM_INPUT,
 316                            HWMON_PWM_INPUT,
 317                            HWMON_PWM_INPUT,
 318                            HWMON_PWM_INPUT),
 319         NULL
 320 };
 321
 322 static const struct hwmon_ops mlxreg_fan_hwmon_hwmon_ops = {
 323         .is_visible = mlxreg_fan_is_visible,
 324         .read = mlxreg_fan_read,
 325         .write = mlxreg_fan_write,
 326 };
 327
 328 static const struct hwmon_chip_info mlxreg_fan_hwmon_chip_info = {
 329         .ops = &mlxreg_fan_hwmon_hwmon_ops,
 330         .info = mlxreg_fan_hwmon_info,
 331 };
 332
 333 static int mlxreg_fan_get_max_state(struct thermal_cooling_device *cdev,
 334                                     unsigned long *state)
 335 {
 336         *state = MLXREG_FAN_MAX_STATE;
 337         return 0;
 338 }
 339
 340 static int mlxreg_fan_get_cur_state(struct thermal_cooling_device *cdev,
 341                                     unsigned long *state)
 342
 343 {
 344         struct mlxreg_fan_pwm *pwm = cdev->devdata;
 345         struct mlxreg_fan *fan = pwm->fan;
 346         u32 regval;
 347         int err;
 348
 349         err = regmap_read(fan->regmap, pwm->reg, &regval);
 350         if (err) {
 351                 dev_err(fan->dev, "Failed to query PWM duty\n");
 352                 return err;
 353         }
 354
 355         *state = MLXREG_FAN_PWM_DUTY2STATE(regval);
 356
 357         return 0;
 358 }
 359
 360 static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
 361                                     unsigned long state)
 362
 363 {
 364         struct mlxreg_fan_pwm *pwm = cdev->devdata;
 365         struct mlxreg_fan *fan = pwm->fan;
 366         int err;
 367
 368         if (state > MLXREG_FAN_MAX_STATE)
 369                 return -EINVAL;
 370
 371         /* Save thermal state. */
 372         pwm->last_thermal_state = state;
 373
 374         state = max_t(unsigned long, state, pwm->last_hwmon_state);
 375         err = regmap_write(fan->regmap, pwm->reg,
 376                            MLXREG_FAN_PWM_STATE2DUTY(state));
 377         if (err) {
 378                 dev_err(fan->dev, "Failed to write PWM duty\n");
 379                 return err;
 380         }
 381         return 0;
 382 }
 383
 384 static const struct thermal_cooling_device_ops mlxreg_fan_cooling_ops = {
 385         .get_max_state  = mlxreg_fan_get_max_state,
 386         .get_cur_state  = mlxreg_fan_get_cur_state,
 387         .set_cur_state  = mlxreg_fan_set_cur_state,
 388 };
 389
 390 static int mlxreg_fan_connect_verify(struct mlxreg_fan *fan,
 391                                      struct mlxreg_core_data *data)
 392 {
 393         u32 regval;
 394         int err;
 395
 396         err = regmap_read(fan->regmap, data->capability, &regval);
 397         if (err) {
 398                 dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
 399                         data->capability);
 400                 return err;
 401         }
 402
 403         return !!(regval & data->bit);
 404 }
 405
 406 static int mlxreg_pwm_connect_verify(struct mlxreg_fan *fan,
 407                                      struct mlxreg_core_data *data)
 408 {
 409         u32 regval;
 410         int err;
 411
 412         err = regmap_read(fan->regmap, data->reg, &regval);
 413         if (err) {
 414                 dev_err(fan->dev, "Failed to query pwm register 0x%08x\n",
 415                         data->reg);
 416                 return err;
 417         }
 418
 419         return regval != MLXREG_FAN_PWM_NOT_CONNECTED;
 420 }
 421
 422 static int mlxreg_fan_speed_divider_get(struct mlxreg_fan *fan,
 423                                         struct mlxreg_core_data *data)
 424 {
 425         u32 regval;
 426         int err;
 427
 428         err = regmap_read(fan->regmap, data->capability, &regval);
 429         if (err) {
 430                 dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
 431                         data->capability);
 432                 return err;
 433         }
 434
 435         /*
 436          * Set divider value according to the capability register, in case it
 437          * contains valid value. Otherwise use default value. The purpose of
 438          * this validation is to protect against the old hardware, in which
 439          * this register can return zero.
 440          */
 441         if (regval > 0 && regval <= MLXREG_FAN_TACHO_DIV_SCALE_MAX)
 442                 fan->divider = regval * MLXREG_FAN_TACHO_DIV_MIN;
 443
 444         return 0;
 445 }
 446
 447 static int mlxreg_fan_config(struct mlxreg_fan *fan,
 448                              struct mlxreg_core_platform_data *pdata)
 449 {
 450         int tacho_num = 0, tacho_avail = 0, pwm_num = 0, i;
 451         struct mlxreg_core_data *data = pdata->data;
 452         bool configured = false;
 453         int err;
 454
 455         fan->samples = MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF;
 456         fan->divider = MLXREG_FAN_TACHO_DIV_DEF;
 457         for (i = 0; i < pdata->counter; i++, data++) {
 458                 if (strnstr(data->label, "tacho", sizeof(data->label))) {
 459                         if (tacho_num == MLXREG_FAN_MAX_TACHO) {
 460                                 dev_err(fan->dev, "too many tacho entries: %s\n",
 461                                         data->label);
 462                                 return -EINVAL;
 463                         }
 464
 465                         if (data->capability) {
 466                                 err = mlxreg_fan_connect_verify(fan, data);
 467                                 if (err < 0)
 468                                         return err;
 469                                 else if (!err) {
 470                                         tacho_num++;
 471                                         continue;
 472                                 }
 473                         }
 474
 475                         fan->tacho[tacho_num].reg = data->reg;
 476                         fan->tacho[tacho_num].mask = data->mask;
 477                         fan->tacho[tacho_num].prsnt = data->reg_prsnt;
 478                         fan->tacho[tacho_num++].connected = true;
 479                         tacho_avail++;
 480                 } else if (strnstr(data->label, "pwm", sizeof(data->label))) {
 481                         if (pwm_num == MLXREG_FAN_MAX_TACHO) {
 482                                 dev_err(fan->dev, "too many pwm entries: %s\n",
 483                                         data->label);
 484                                 return -EINVAL;
 485                         }
 486
 487                         /* Validate if more then one PWM is connected. */
 488                         if (pwm_num) {
 489                                 err = mlxreg_pwm_connect_verify(fan, data);
 490                                 if (err < 0)
 491                                         return err;
 492                                 else if (!err)
 493                                         continue;
 494                         }
 495
 496                         fan->pwm[pwm_num].reg = data->reg;
 497                         fan->pwm[pwm_num].connected = true;
 498                         pwm_num++;
 499                 } else if (strnstr(data->label, "conf", sizeof(data->label))) {
 500                         if (configured) {
 501                                 dev_err(fan->dev, "duplicate conf entry: %s\n",
 502                                         data->label);
 503                                 return -EINVAL;
 504                         }
 505                         /* Validate that conf parameters are not zeros. */
 506                         if (!data->mask && !data->bit && !data->capability) {
 507                                 dev_err(fan->dev, "invalid conf entry params: %s\n",
 508                                         data->label);
 509                                 return -EINVAL;
 510                         }
 511                         if (data->capability) {
 512                                 err = mlxreg_fan_speed_divider_get(fan, data);
 513                                 if (err)
 514                                         return err;
 515                         } else {
 516                                 if (data->mask)
 517                                         fan->samples = data->mask;
 518                                 if (data->bit)
 519                                         fan->divider = data->bit;
 520                         }
 521                         configured = true;
 522                 } else {
 523                         dev_err(fan->dev, "invalid label: %s\n", data->label);
 524                         return -EINVAL;
 525                 }
 526         }
 527
 528         if (pdata->capability) {
 529                 int drwr_avail;
 530                 u32 regval;
 531
 532                 /* Obtain the number of FAN drawers, supported by system. */
 533                 err = regmap_read(fan->regmap, pdata->capability, &regval);
 534                 if (err) {
 535                         dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
 536                                 pdata->capability);
 537                         return err;
 538                 }
 539
 540                 drwr_avail = hweight32(regval);
 541                 if (!tacho_avail || !drwr_avail || tacho_avail < drwr_avail) {
 542                         dev_err(fan->dev, "Configuration is invalid: drawers num %d tachos num %d\n",
 543                                 drwr_avail, tacho_avail);
 544                         return -EINVAL;
 545                 }
 546
 547                 /* Set the number of tachometers per one drawer. */
 548                 fan->tachos_per_drwr = tacho_avail / drwr_avail;
 549         }
 550
 551         return 0;
 552 }
 553
 554 static int mlxreg_fan_cooling_config(struct device *dev, struct mlxreg_fan *fan)
 555 {
 556         int i;
 557
 558         for (i = 0; i < MLXREG_FAN_MAX_PWM; i++) {
 559                 struct mlxreg_fan_pwm *pwm = &fan->pwm[i];
 560
 561                 if (!pwm->connected)
 562                         continue;
 563                 pwm->fan = fan;
 564                 pwm->cdev = devm_thermal_of_cooling_device_register(dev, NULL, mlxreg_fan_name[i],
 565                                                                     pwm, &mlxreg_fan_cooling_ops);
 566                 if (IS_ERR(pwm->cdev)) {
 567                         dev_err(dev, "Failed to register cooling device\n");
 568                         return PTR_ERR(pwm->cdev);
 569                 }
 570
 571                 /* Set minimal PWM speed. */
 572                 pwm->last_hwmon_state = MLXREG_FAN_PWM_DUTY2STATE(MLXREG_FAN_MIN_DUTY);
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int mlxreg_fan_probe(struct platform_device *pdev)
 579 {
 580         struct mlxreg_core_platform_data *pdata;
 581         struct device *dev = &pdev->dev;
 582         struct mlxreg_fan *fan;
 583         struct device *hwm;
 584         int err;
 585
 586         pdata = dev_get_platdata(dev);
 587         if (!pdata) {
 588                 dev_err(dev, "Failed to get platform data.\n");
 589                 return -EINVAL;
 590         }
 591
 592         fan = devm_kzalloc(dev, sizeof(*fan), GFP_KERNEL);
 593         if (!fan)
 594                 return -ENOMEM;
 595
 596         fan->dev = dev;
 597         fan->regmap = pdata->regmap;
 598
 599         err = mlxreg_fan_config(fan, pdata);
 600         if (err)
 601                 return err;
 602
 603         hwm = devm_hwmon_device_register_with_info(dev, "mlxreg_fan",
 604                                                    fan,
 605                                                    &mlxreg_fan_hwmon_chip_info,
 606                                                    NULL);
 607         if (IS_ERR(hwm)) {
 608                 dev_err(dev, "Failed to register hwmon device\n");
 609                 return PTR_ERR(hwm);
 610         }
 611
 612         if (IS_REACHABLE(CONFIG_THERMAL))
 613                 err = mlxreg_fan_cooling_config(dev, fan);
 614
 615         return err;
 616 }
 617
 618 static struct platform_driver mlxreg_fan_driver = {
 619         .driver = {
 620             .name = "mlxreg-fan",
 621         },
 622         .probe = mlxreg_fan_probe,
 623 };
 624
 625 module_platform_driver(mlxreg_fan_driver);
 626
 627 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
 628 MODULE_DESCRIPTION("Mellanox FAN driver");
 629 MODULE_LICENSE("GPL");
 630 MODULE_ALIAS("platform:mlxreg-fan");