drivers/regulator/helpers.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 //
   3 // helpers.c  --  Voltage/Current Regulator framework helper functions.
   4 //
   5 // Copyright 2007, 2008 Wolfson Microelectronics PLC.
   6 // Copyright 2008 SlimLogic Ltd.
   7
   8 #include <linux/kernel.h>
   9 #include <linux/err.h>
  10 #include <linux/delay.h>
  11 #include <linux/regmap.h>
  12 #include <linux/regulator/consumer.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/module.h>
  15
  16 #include "internal.h"
  17
  18 /**
  19  * regulator_is_enabled_regmap - standard is_enabled() for regmap users
  20  *
  21  * @rdev: regulator to operate on
  22  *
  23  * Regulators that use regmap for their register I/O can set the
  24  * enable_reg and enable_mask fields in their descriptor and then use
  25  * this as their is_enabled operation, saving some code.
  26  */
  27 int regulator_is_enabled_regmap(struct regulator_dev *rdev)
  28 {
  29         unsigned int val;
  30         int ret;
  31
  32         ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
  33         if (ret != 0)
  34                 return ret;
  35
  36         val &= rdev->desc->enable_mask;
  37
  38         if (rdev->desc->enable_is_inverted) {
  39                 if (rdev->desc->enable_val)
  40                         return val != rdev->desc->enable_val;
  41                 return val == 0;
  42         } else {
  43                 if (rdev->desc->enable_val)
  44                         return val == rdev->desc->enable_val;
  45                 return val != 0;
  46         }
  47 }
  48 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
  49
  50 /**
  51  * regulator_enable_regmap - standard enable() for regmap users
  52  *
  53  * @rdev: regulator to operate on
  54  *
  55  * Regulators that use regmap for their register I/O can set the
  56  * enable_reg and enable_mask fields in their descriptor and then use
  57  * this as their enable() operation, saving some code.
  58  */
  59 int regulator_enable_regmap(struct regulator_dev *rdev)
  60 {
  61         unsigned int val;
  62
  63         if (rdev->desc->enable_is_inverted) {
  64                 val = rdev->desc->disable_val;
  65         } else {
  66                 val = rdev->desc->enable_val;
  67                 if (!val)
  68                         val = rdev->desc->enable_mask;
  69         }
  70
  71         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
  72                                   rdev->desc->enable_mask, val);
  73 }
  74 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
  75
  76 /**
  77  * regulator_disable_regmap - standard disable() for regmap users
  78  *
  79  * @rdev: regulator to operate on
  80  *
  81  * Regulators that use regmap for their register I/O can set the
  82  * enable_reg and enable_mask fields in their descriptor and then use
  83  * this as their disable() operation, saving some code.
  84  */
  85 int regulator_disable_regmap(struct regulator_dev *rdev)
  86 {
  87         unsigned int val;
  88
  89         if (rdev->desc->enable_is_inverted) {
  90                 val = rdev->desc->enable_val;
  91                 if (!val)
  92                         val = rdev->desc->enable_mask;
  93         } else {
  94                 val = rdev->desc->disable_val;
  95         }
  96
  97         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
  98                                   rdev->desc->enable_mask, val);
  99 }
 100 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
 101
 102 static int regulator_range_selector_to_index(struct regulator_dev *rdev,
 103                                              unsigned int rval)
 104 {
 105         int i;
 106
 107         if (!rdev->desc->linear_range_selectors)
 108                 return -EINVAL;
 109
 110         rval &= rdev->desc->vsel_range_mask;
 111
 112         for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
 113                 if (rdev->desc->linear_range_selectors[i] == rval)
 114                         return i;
 115         }
 116         return -EINVAL;
 117 }
 118
 119 /**
 120  * regulator_get_voltage_sel_pickable_regmap - pickable range get_voltage_sel
 121  *
 122  * @rdev: regulator to operate on
 123  *
 124  * Regulators that use regmap for their register I/O and use pickable
 125  * ranges can set the vsel_reg, vsel_mask, vsel_range_reg and vsel_range_mask
 126  * fields in their descriptor and then use this as their get_voltage_vsel
 127  * operation, saving some code.
 128  */
 129 int regulator_get_voltage_sel_pickable_regmap(struct regulator_dev *rdev)
 130 {
 131         unsigned int r_val;
 132         int range;
 133         unsigned int val;
 134         int ret;
 135         unsigned int voltages = 0;
 136         const struct linear_range *r = rdev->desc->linear_ranges;
 137
 138         if (!r)
 139                 return -EINVAL;
 140
 141         ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
 142         if (ret != 0)
 143                 return ret;
 144
 145         ret = regmap_read(rdev->regmap, rdev->desc->vsel_range_reg, &r_val);
 146         if (ret != 0)
 147                 return ret;
 148
 149         val &= rdev->desc->vsel_mask;
 150         val >>= ffs(rdev->desc->vsel_mask) - 1;
 151
 152         range = regulator_range_selector_to_index(rdev, r_val);
 153         if (range < 0)
 154                 return -EINVAL;
 155
 156         voltages = linear_range_values_in_range_array(r, range);
 157
 158         return val + voltages;
 159 }
 160 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_pickable_regmap);
 161
 162 /**
 163  * regulator_set_voltage_sel_pickable_regmap - pickable range set_voltage_sel
 164  *
 165  * @rdev: regulator to operate on
 166  * @sel: Selector to set
 167  *
 168  * Regulators that use regmap for their register I/O and use pickable
 169  * ranges can set the vsel_reg, vsel_mask, vsel_range_reg and vsel_range_mask
 170  * fields in their descriptor and then use this as their set_voltage_vsel
 171  * operation, saving some code.
 172  */
 173 int regulator_set_voltage_sel_pickable_regmap(struct regulator_dev *rdev,
 174                                               unsigned int sel)
 175 {
 176         unsigned int range;
 177         int ret, i;
 178         unsigned int voltages_in_range = 0;
 179
 180         for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
 181                 const struct linear_range *r;
 182
 183                 r = &rdev->desc->linear_ranges[i];
 184                 voltages_in_range = linear_range_values_in_range(r);
 185
 186                 if (sel < voltages_in_range)
 187                         break;
 188                 sel -= voltages_in_range;
 189         }
 190
 191         if (i == rdev->desc->n_linear_ranges)
 192                 return -EINVAL;
 193
 194         sel <<= ffs(rdev->desc->vsel_mask) - 1;
 195         sel += rdev->desc->linear_ranges[i].min_sel;
 196
 197         range = rdev->desc->linear_range_selectors[i];
 198
 199         if (rdev->desc->vsel_reg == rdev->desc->vsel_range_reg) {
 200                 ret = regmap_update_bits(rdev->regmap,
 201                                          rdev->desc->vsel_reg,
 202                                          rdev->desc->vsel_range_mask |
 203                                          rdev->desc->vsel_mask, sel | range);
 204         } else {
 205                 ret = regmap_update_bits(rdev->regmap,
 206                                          rdev->desc->vsel_range_reg,
 207                                          rdev->desc->vsel_range_mask, range);
 208                 if (ret)
 209                         return ret;
 210
 211                 ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
 212                                   rdev->desc->vsel_mask, sel);
 213         }
 214
 215         if (ret)
 216                 return ret;
 217
 218         if (rdev->desc->apply_bit)
 219                 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
 220                                          rdev->desc->apply_bit,
 221                                          rdev->desc->apply_bit);
 222         return ret;
 223 }
 224 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_pickable_regmap);
 225
 226 /**
 227  * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
 228  *
 229  * @rdev: regulator to operate on
 230  *
 231  * Regulators that use regmap for their register I/O can set the
 232  * vsel_reg and vsel_mask fields in their descriptor and then use this
 233  * as their get_voltage_vsel operation, saving some code.
 234  */
 235 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
 236 {
 237         unsigned int val;
 238         int ret;
 239
 240         ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
 241         if (ret != 0)
 242                 return ret;
 243
 244         val &= rdev->desc->vsel_mask;
 245         val >>= ffs(rdev->desc->vsel_mask) - 1;
 246
 247         return val;
 248 }
 249 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
 250
 251 /**
 252  * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
 253  *
 254  * @rdev: regulator to operate on
 255  * @sel: Selector to set
 256  *
 257  * Regulators that use regmap for their register I/O can set the
 258  * vsel_reg and vsel_mask fields in their descriptor and then use this
 259  * as their set_voltage_vsel operation, saving some code.
 260  */
 261 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
 262 {
 263         int ret;
 264
 265         sel <<= ffs(rdev->desc->vsel_mask) - 1;
 266
 267         ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
 268                                   rdev->desc->vsel_mask, sel);
 269         if (ret)
 270                 return ret;
 271
 272         if (rdev->desc->apply_bit)
 273                 ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
 274                                          rdev->desc->apply_bit,
 275                                          rdev->desc->apply_bit);
 276         return ret;
 277 }
 278 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
 279
 280 /**
 281  * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
 282  *
 283  * @rdev: Regulator to operate on
 284  * @min_uV: Lower bound for voltage
 285  * @max_uV: Upper bound for voltage
 286  *
 287  * Drivers implementing set_voltage_sel() and list_voltage() can use
 288  * this as their map_voltage() operation.  It will find a suitable
 289  * voltage by calling list_voltage() until it gets something in bounds
 290  * for the requested voltages.
 291  */
 292 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
 293                                   int min_uV, int max_uV)
 294 {
 295         int best_val = INT_MAX;
 296         int selector = 0;
 297         int i, ret;
 298
 299         /* Find the smallest voltage that falls within the specified
 300          * range.
 301          */
 302         for (i = 0; i < rdev->desc->n_voltages; i++) {
 303                 ret = rdev->desc->ops->list_voltage(rdev, i);
 304                 if (ret < 0)
 305                         continue;
 306
 307                 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
 308                         best_val = ret;
 309                         selector = i;
 310                 }
 311         }
 312
 313         if (best_val != INT_MAX)
 314                 return selector;
 315         else
 316                 return -EINVAL;
 317 }
 318 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
 319
 320 /**
 321  * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
 322  *
 323  * @rdev: Regulator to operate on
 324  * @min_uV: Lower bound for voltage
 325  * @max_uV: Upper bound for voltage
 326  *
 327  * Drivers that have ascendant voltage list can use this as their
 328  * map_voltage() operation.
 329  */
 330 int regulator_map_voltage_ascend(struct regulator_dev *rdev,
 331                                  int min_uV, int max_uV)
 332 {
 333         int i, ret;
 334
 335         for (i = 0; i < rdev->desc->n_voltages; i++) {
 336                 ret = rdev->desc->ops->list_voltage(rdev, i);
 337                 if (ret < 0)
 338                         continue;
 339
 340                 if (ret > max_uV)
 341                         break;
 342
 343                 if (ret >= min_uV && ret <= max_uV)
 344                         return i;
 345         }
 346
 347         return -EINVAL;
 348 }
 349 EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
 350
 351 /**
 352  * regulator_map_voltage_linear - map_voltage() for simple linear mappings
 353  *
 354  * @rdev: Regulator to operate on
 355  * @min_uV: Lower bound for voltage
 356  * @max_uV: Upper bound for voltage
 357  *
 358  * Drivers providing min_uV and uV_step in their regulator_desc can
 359  * use this as their map_voltage() operation.
 360  */
 361 int regulator_map_voltage_linear(struct regulator_dev *rdev,
 362                                  int min_uV, int max_uV)
 363 {
 364         int ret, voltage;
 365
 366         /* Allow uV_step to be 0 for fixed voltage */
 367         if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
 368                 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
 369                         return 0;
 370                 else
 371                         return -EINVAL;
 372         }
 373
 374         if (!rdev->desc->uV_step) {
 375                 BUG_ON(!rdev->desc->uV_step);
 376                 return -EINVAL;
 377         }
 378
 379         if (min_uV < rdev->desc->min_uV)
 380                 min_uV = rdev->desc->min_uV;
 381
 382         ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
 383         if (ret < 0)
 384                 return ret;
 385
 386         ret += rdev->desc->linear_min_sel;
 387
 388         /* Map back into a voltage to verify we're still in bounds */
 389         voltage = rdev->desc->ops->list_voltage(rdev, ret);
 390         if (voltage < min_uV || voltage > max_uV)
 391                 return -EINVAL;
 392
 393         return ret;
 394 }
 395 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
 396
 397 /**
 398  * regulator_map_voltage_linear_range - map_voltage() for multiple linear ranges
 399  *
 400  * @rdev: Regulator to operate on
 401  * @min_uV: Lower bound for voltage
 402  * @max_uV: Upper bound for voltage
 403  *
 404  * Drivers providing linear_ranges in their descriptor can use this as
 405  * their map_voltage() callback.
 406  */
 407 int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
 408                                        int min_uV, int max_uV)
 409 {
 410         const struct linear_range *range;
 411         int ret = -EINVAL;
 412         unsigned int sel;
 413         bool found;
 414         int voltage, i;
 415
 416         if (!rdev->desc->n_linear_ranges) {
 417                 BUG_ON(!rdev->desc->n_linear_ranges);
 418                 return -EINVAL;
 419         }
 420
 421         for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
 422                 range = &rdev->desc->linear_ranges[i];
 423
 424                 ret = linear_range_get_selector_high(range, min_uV, &sel,
 425                                                      &found);
 426                 if (ret)
 427                         continue;
 428                 ret = sel;
 429
 430                 /*
 431                  * Map back into a voltage to verify we're still in bounds.
 432                  * If we are not, then continue checking rest of the ranges.
 433                  */
 434                 voltage = rdev->desc->ops->list_voltage(rdev, sel);
 435                 if (voltage >= min_uV && voltage <= max_uV)
 436                         break;
 437         }
 438
 439         if (i == rdev->desc->n_linear_ranges)
 440                 return -EINVAL;
 441
 442         return ret;
 443 }
 444 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear_range);
 445
 446 /**
 447  * regulator_map_voltage_pickable_linear_range - map_voltage, pickable ranges
 448  *
 449  * @rdev: Regulator to operate on
 450  * @min_uV: Lower bound for voltage
 451  * @max_uV: Upper bound for voltage
 452  *
 453  * Drivers providing pickable linear_ranges in their descriptor can use
 454  * this as their map_voltage() callback.
 455  */
 456 int regulator_map_voltage_pickable_linear_range(struct regulator_dev *rdev,
 457                                                 int min_uV, int max_uV)
 458 {
 459         const struct linear_range *range;
 460         int ret = -EINVAL;
 461         int voltage, i;
 462         unsigned int selector = 0;
 463
 464         if (!rdev->desc->n_linear_ranges) {
 465                 BUG_ON(!rdev->desc->n_linear_ranges);
 466                 return -EINVAL;
 467         }
 468
 469         for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
 470                 int linear_max_uV;
 471                 bool found;
 472                 unsigned int sel;
 473
 474                 range = &rdev->desc->linear_ranges[i];
 475                 linear_max_uV = linear_range_get_max_value(range);
 476
 477                 if (!(min_uV <= linear_max_uV && max_uV >= range->min)) {
 478                         selector += linear_range_values_in_range(range);
 479                         continue;
 480                 }
 481
 482                 ret = linear_range_get_selector_high(range, min_uV, &sel,
 483                                                      &found);
 484                 if (ret) {
 485                         selector += linear_range_values_in_range(range);
 486                         continue;
 487                 }
 488
 489                 ret = selector + sel - range->min_sel;
 490
 491                 voltage = rdev->desc->ops->list_voltage(rdev, ret);
 492
 493                 /*
 494                  * Map back into a voltage to verify we're still in bounds.
 495                  * We may have overlapping voltage ranges. Hence we don't
 496                  * exit but retry until we have checked all ranges.
 497                  */
 498                 if (voltage < min_uV || voltage > max_uV)
 499                         selector += linear_range_values_in_range(range);
 500                 else
 501                         break;
 502         }
 503
 504         if (i == rdev->desc->n_linear_ranges)
 505                 return -EINVAL;
 506
 507         return ret;
 508 }
 509 EXPORT_SYMBOL_GPL(regulator_map_voltage_pickable_linear_range);
 510
 511 /**
 512  * regulator_list_voltage_linear - List voltages with simple calculation
 513  *
 514  * @rdev: Regulator device
 515  * @selector: Selector to convert into a voltage
 516  *
 517  * Regulators with a simple linear mapping between voltages and
 518  * selectors can set min_uV and uV_step in the regulator descriptor
 519  * and then use this function as their list_voltage() operation,
 520  */
 521 int regulator_list_voltage_linear(struct regulator_dev *rdev,
 522                                   unsigned int selector)
 523 {
 524         if (selector >= rdev->desc->n_voltages)
 525                 return -EINVAL;
 526         if (selector < rdev->desc->linear_min_sel)
 527                 return 0;
 528
 529         selector -= rdev->desc->linear_min_sel;
 530
 531         return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
 532 }
 533 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
 534
 535 /**
 536  * regulator_list_voltage_pickable_linear_range - pickable range list voltages
 537  *
 538  * @rdev: Regulator device
 539  * @selector: Selector to convert into a voltage
 540  *
 541  * list_voltage() operation, intended to be used by drivers utilizing pickable
 542  * ranges helpers.
 543  */
 544 int regulator_list_voltage_pickable_linear_range(struct regulator_dev *rdev,
 545                                                  unsigned int selector)
 546 {
 547         const struct linear_range *range;
 548         int i;
 549         unsigned int all_sels = 0;
 550
 551         if (!rdev->desc->n_linear_ranges) {
 552                 BUG_ON(!rdev->desc->n_linear_ranges);
 553                 return -EINVAL;
 554         }
 555
 556         for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
 557                 unsigned int sel_indexes;
 558
 559                 range = &rdev->desc->linear_ranges[i];
 560
 561                 sel_indexes = linear_range_values_in_range(range) - 1;
 562
 563                 if (all_sels + sel_indexes >= selector) {
 564                         selector -= all_sels;
 565                         /*
 566                          * As we see here, pickable ranges work only as
 567                          * long as the first selector for each pickable
 568                          * range is 0, and the each subsequent range for
 569                          * this 'pick' follow immediately at next unused
 570                          * selector (Eg. there is no gaps between ranges).
 571                          * I think this is fine but it probably should be
 572                          * documented. OTOH, whole pickable range stuff
 573                          * might benefit from some documentation
 574                          */
 575                         return range->min + (range->step * selector);
 576                 }
 577
 578                 all_sels += (sel_indexes + 1);
 579         }
 580
 581         return -EINVAL;
 582 }
 583 EXPORT_SYMBOL_GPL(regulator_list_voltage_pickable_linear_range);
 584
 585 /**
 586  * regulator_desc_list_voltage_linear_range - List voltages for linear ranges
 587  *
 588  * @desc: Regulator desc for regulator which volatges are to be listed
 589  * @selector: Selector to convert into a voltage
 590  *
 591  * Regulators with a series of simple linear mappings between voltages
 592  * and selectors who have set linear_ranges in the regulator descriptor
 593  * can use this function prior regulator registration to list voltages.
 594  * This is useful when voltages need to be listed during device-tree
 595  * parsing.
 596  */
 597 int regulator_desc_list_voltage_linear_range(const struct regulator_desc *desc,
 598                                              unsigned int selector)
 599 {
 600         unsigned int val;
 601         int ret;
 602
 603         BUG_ON(!desc->n_linear_ranges);
 604
 605         ret = linear_range_get_value_array(desc->linear_ranges,
 606                                            desc->n_linear_ranges, selector,
 607                                            &val);
 608         if (ret)
 609                 return ret;
 610
 611         return val;
 612 }
 613 EXPORT_SYMBOL_GPL(regulator_desc_list_voltage_linear_range);
 614
 615 /**
 616  * regulator_list_voltage_linear_range - List voltages for linear ranges
 617  *
 618  * @rdev: Regulator device
 619  * @selector: Selector to convert into a voltage
 620  *
 621  * Regulators with a series of simple linear mappings between voltages
 622  * and selectors can set linear_ranges in the regulator descriptor and
 623  * then use this function as their list_voltage() operation,
 624  */
 625 int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
 626                                         unsigned int selector)
 627 {
 628         return regulator_desc_list_voltage_linear_range(rdev->desc, selector);
 629 }
 630 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range);
 631
 632 /**
 633  * regulator_list_voltage_table - List voltages with table based mapping
 634  *
 635  * @rdev: Regulator device
 636  * @selector: Selector to convert into a voltage
 637  *
 638  * Regulators with table based mapping between voltages and
 639  * selectors can set volt_table in the regulator descriptor
 640  * and then use this function as their list_voltage() operation.
 641  */
 642 int regulator_list_voltage_table(struct regulator_dev *rdev,
 643                                  unsigned int selector)
 644 {
 645         if (!rdev->desc->volt_table) {
 646                 BUG_ON(!rdev->desc->volt_table);
 647                 return -EINVAL;
 648         }
 649
 650         if (selector >= rdev->desc->n_voltages)
 651                 return -EINVAL;
 652         if (selector < rdev->desc->linear_min_sel)
 653                 return 0;
 654
 655         return rdev->desc->volt_table[selector];
 656 }
 657 EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
 658
 659 /**
 660  * regulator_set_bypass_regmap - Default set_bypass() using regmap
 661  *
 662  * @rdev: device to operate on.
 663  * @enable: state to set.
 664  */
 665 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
 666 {
 667         unsigned int val;
 668
 669         if (enable) {
 670                 val = rdev->desc->bypass_val_on;
 671                 if (!val)
 672                         val = rdev->desc->bypass_mask;
 673         } else {
 674                 val = rdev->desc->bypass_val_off;
 675         }
 676
 677         return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
 678                                   rdev->desc->bypass_mask, val);
 679 }
 680 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
 681
 682 /**
 683  * regulator_set_soft_start_regmap - Default set_soft_start() using regmap
 684  *
 685  * @rdev: device to operate on.
 686  */
 687 int regulator_set_soft_start_regmap(struct regulator_dev *rdev)
 688 {
 689         unsigned int val;
 690
 691         val = rdev->desc->soft_start_val_on;
 692         if (!val)
 693                 val = rdev->desc->soft_start_mask;
 694
 695         return regmap_update_bits(rdev->regmap, rdev->desc->soft_start_reg,
 696                                   rdev->desc->soft_start_mask, val);
 697 }
 698 EXPORT_SYMBOL_GPL(regulator_set_soft_start_regmap);
 699
 700 /**
 701  * regulator_set_pull_down_regmap - Default set_pull_down() using regmap
 702  *
 703  * @rdev: device to operate on.
 704  */
 705 int regulator_set_pull_down_regmap(struct regulator_dev *rdev)
 706 {
 707         unsigned int val;
 708
 709         val = rdev->desc->pull_down_val_on;
 710         if (!val)
 711                 val = rdev->desc->pull_down_mask;
 712
 713         return regmap_update_bits(rdev->regmap, rdev->desc->pull_down_reg,
 714                                   rdev->desc->pull_down_mask, val);
 715 }
 716 EXPORT_SYMBOL_GPL(regulator_set_pull_down_regmap);
 717
 718 /**
 719  * regulator_get_bypass_regmap - Default get_bypass() using regmap
 720  *
 721  * @rdev: device to operate on.
 722  * @enable: current state.
 723  */
 724 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
 725 {
 726         unsigned int val;
 727         unsigned int val_on = rdev->desc->bypass_val_on;
 728         int ret;
 729
 730         ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
 731         if (ret != 0)
 732                 return ret;
 733
 734         if (!val_on)
 735                 val_on = rdev->desc->bypass_mask;
 736
 737         *enable = (val & rdev->desc->bypass_mask) == val_on;
 738
 739         return 0;
 740 }
 741 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
 742
 743 /**
 744  * regulator_set_active_discharge_regmap - Default set_active_discharge()
 745  *                                         using regmap
 746  *
 747  * @rdev: device to operate on.
 748  * @enable: state to set, 0 to disable and 1 to enable.
 749  */
 750 int regulator_set_active_discharge_regmap(struct regulator_dev *rdev,
 751                                           bool enable)
 752 {
 753         unsigned int val;
 754
 755         if (enable)
 756                 val = rdev->desc->active_discharge_on;
 757         else
 758                 val = rdev->desc->active_discharge_off;
 759
 760         return regmap_update_bits(rdev->regmap,
 761                                   rdev->desc->active_discharge_reg,
 762                                   rdev->desc->active_discharge_mask, val);
 763 }
 764 EXPORT_SYMBOL_GPL(regulator_set_active_discharge_regmap);
 765
 766 /**
 767  * regulator_set_current_limit_regmap - set_current_limit for regmap users
 768  *
 769  * @rdev: regulator to operate on
 770  * @min_uA: Lower bound for current limit
 771  * @max_uA: Upper bound for current limit
 772  *
 773  * Regulators that use regmap for their register I/O can set curr_table,
 774  * csel_reg and csel_mask fields in their descriptor and then use this
 775  * as their set_current_limit operation, saving some code.
 776  */
 777 int regulator_set_current_limit_regmap(struct regulator_dev *rdev,
 778                                        int min_uA, int max_uA)
 779 {
 780         unsigned int n_currents = rdev->desc->n_current_limits;
 781         int i, sel = -1;
 782
 783         if (n_currents == 0)
 784                 return -EINVAL;
 785
 786         if (rdev->desc->curr_table) {
 787                 const unsigned int *curr_table = rdev->desc->curr_table;
 788                 bool ascend = curr_table[n_currents - 1] > curr_table[0];
 789
 790                 /* search for closest to maximum */
 791                 if (ascend) {
 792                         for (i = n_currents - 1; i >= 0; i--) {
 793                                 if (min_uA <= curr_table[i] &&
 794                                     curr_table[i] <= max_uA) {
 795                                         sel = i;
 796                                         break;
 797                                 }
 798                         }
 799                 } else {
 800                         for (i = 0; i < n_currents; i++) {
 801                                 if (min_uA <= curr_table[i] &&
 802                                     curr_table[i] <= max_uA) {
 803                                         sel = i;
 804                                         break;
 805                                 }
 806                         }
 807                 }
 808         }
 809
 810         if (sel < 0)
 811                 return -EINVAL;
 812
 813         sel <<= ffs(rdev->desc->csel_mask) - 1;
 814
 815         return regmap_update_bits(rdev->regmap, rdev->desc->csel_reg,
 816                                   rdev->desc->csel_mask, sel);
 817 }
 818 EXPORT_SYMBOL_GPL(regulator_set_current_limit_regmap);
 819
 820 /**
 821  * regulator_get_current_limit_regmap - get_current_limit for regmap users
 822  *
 823  * @rdev: regulator to operate on
 824  *
 825  * Regulators that use regmap for their register I/O can set the
 826  * csel_reg and csel_mask fields in their descriptor and then use this
 827  * as their get_current_limit operation, saving some code.
 828  */
 829 int regulator_get_current_limit_regmap(struct regulator_dev *rdev)
 830 {
 831         unsigned int val;
 832         int ret;
 833
 834         ret = regmap_read(rdev->regmap, rdev->desc->csel_reg, &val);
 835         if (ret != 0)
 836                 return ret;
 837
 838         val &= rdev->desc->csel_mask;
 839         val >>= ffs(rdev->desc->csel_mask) - 1;
 840
 841         if (rdev->desc->curr_table) {
 842                 if (val >= rdev->desc->n_current_limits)
 843                         return -EINVAL;
 844
 845                 return rdev->desc->curr_table[val];
 846         }
 847
 848         return -EINVAL;
 849 }
 850 EXPORT_SYMBOL_GPL(regulator_get_current_limit_regmap);
 851
 852 /**
 853  * regulator_bulk_set_supply_names - initialize the 'supply' fields in an array
 854  *                                   of regulator_bulk_data structs
 855  *
 856  * @consumers: array of regulator_bulk_data entries to initialize
 857  * @supply_names: array of supply name strings
 858  * @num_supplies: number of supply names to initialize
 859  *
 860  * Note: the 'consumers' array must be the size of 'num_supplies'.
 861  */
 862 void regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers,
 863                                      const char *const *supply_names,
 864                                      unsigned int num_supplies)
 865 {
 866         unsigned int i;
 867
 868         for (i = 0; i < num_supplies; i++)
 869                 consumers[i].supply = supply_names[i];
 870 }
 871 EXPORT_SYMBOL_GPL(regulator_bulk_set_supply_names);
 872
 873 /**
 874  * regulator_is_equal - test whether two regulators are the same
 875  *
 876  * @reg1: first regulator to operate on
 877  * @reg2: second regulator to operate on
 878  */
 879 bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2)
 880 {
 881         return reg1->rdev == reg2->rdev;
 882 }
 883 EXPORT_SYMBOL_GPL(regulator_is_equal);