drivers/regulator/core.c

   1 /*
   2  * core.c  --  Voltage/Current Regulator framework.
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  * Copyright 2008 SlimLogic Ltd.
   6  *
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #define pr_fmt(fmt) "%s: " fmt, __func__
  17
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/device.h>
  21 #include <linux/slab.h>
  22 #include <linux/err.h>
  23 #include <linux/mutex.h>
  24 #include <linux/suspend.h>
  25 #include <linux/delay.h>
  26 #include <linux/regulator/consumer.h>
  27 #include <linux/regulator/driver.h>
  28 #include <linux/regulator/machine.h>
  29
  30 #define CREATE_TRACE_POINTS
  31 #include <trace/events/regulator.h>
  32
  33 #include "dummy.h"
  34
  35 #define rdev_err(rdev, fmt, ...)                                        \
  36         pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  37 #define rdev_warn(rdev, fmt, ...)                                       \
  38         pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  39 #define rdev_info(rdev, fmt, ...)                                       \
  40         pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  41 #define rdev_dbg(rdev, fmt, ...)                                        \
  42         pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  43
  44 static DEFINE_MUTEX(regulator_list_mutex);
  45 static LIST_HEAD(regulator_list);
  46 static LIST_HEAD(regulator_map_list);
  47 static int has_full_constraints;
  48 static bool board_wants_dummy_regulator;
  49
  50 /*
  51  * struct regulator_map
  52  *
  53  * Used to provide symbolic supply names to devices.
  54  */
  55 struct regulator_map {
  56         struct list_head list;
  57         const char *dev_name;   /* The dev_name() for the consumer */
  58         const char *supply;
  59         struct regulator_dev *regulator;
  60 };
  61
  62 /*
  63  * struct regulator
  64  *
  65  * One for each consumer device.
  66  */
  67 struct regulator {
  68         struct device *dev;
  69         struct list_head list;
  70         int uA_load;
  71         int min_uV;
  72         int max_uV;
  73         char *supply_name;
  74         struct device_attribute dev_attr;
  75         struct regulator_dev *rdev;
  76 };
  77
  78 static int _regulator_is_enabled(struct regulator_dev *rdev);
  79 static int _regulator_disable(struct regulator_dev *rdev,
  80                 struct regulator_dev **supply_rdev_ptr);
  81 static int _regulator_get_voltage(struct regulator_dev *rdev);
  82 static int _regulator_get_current_limit(struct regulator_dev *rdev);
  83 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
  84 static void _notifier_call_chain(struct regulator_dev *rdev,
  85                                   unsigned long event, void *data);
  86 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
  87                                      int min_uV, int max_uV);
  88
  89 static const char *rdev_get_name(struct regulator_dev *rdev)
  90 {
  91         if (rdev->constraints && rdev->constraints->name)
  92                 return rdev->constraints->name;
  93         else if (rdev->desc->name)
  94                 return rdev->desc->name;
  95         else
  96                 return "";
  97 }
  98
  99 /* gets the regulator for a given consumer device */
 100 static struct regulator *get_device_regulator(struct device *dev)
 101 {
 102         struct regulator *regulator = NULL;
 103         struct regulator_dev *rdev;
 104
 105         mutex_lock(&regulator_list_mutex);
 106         list_for_each_entry(rdev, &regulator_list, list) {
 107                 mutex_lock(&rdev->mutex);
 108                 list_for_each_entry(regulator, &rdev->consumer_list, list) {
 109                         if (regulator->dev == dev) {
 110                                 mutex_unlock(&rdev->mutex);
 111                                 mutex_unlock(&regulator_list_mutex);
 112                                 return regulator;
 113                         }
 114                 }
 115                 mutex_unlock(&rdev->mutex);
 116         }
 117         mutex_unlock(&regulator_list_mutex);
 118         return NULL;
 119 }
 120
 121 /* Platform voltage constraint check */
 122 static int regulator_check_voltage(struct regulator_dev *rdev,
 123                                    int *min_uV, int *max_uV)
 124 {
 125         BUG_ON(*min_uV > *max_uV);
 126
 127         if (!rdev->constraints) {
 128                 rdev_err(rdev, "no constraints\n");
 129                 return -ENODEV;
 130         }
 131         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 132                 rdev_err(rdev, "operation not allowed\n");
 133                 return -EPERM;
 134         }
 135
 136         if (*max_uV > rdev->constraints->max_uV)
 137                 *max_uV = rdev->constraints->max_uV;
 138         if (*min_uV < rdev->constraints->min_uV)
 139                 *min_uV = rdev->constraints->min_uV;
 140
 141         if (*min_uV > *max_uV)
 142                 return -EINVAL;
 143
 144         return 0;
 145 }
 146
 147 /* Make sure we select a voltage that suits the needs of all
 148  * regulator consumers
 149  */
 150 static int regulator_check_consumers(struct regulator_dev *rdev,
 151                                      int *min_uV, int *max_uV)
 152 {
 153         struct regulator *regulator;
 154
 155         list_for_each_entry(regulator, &rdev->consumer_list, list) {
 156                 if (*max_uV > regulator->max_uV)
 157                         *max_uV = regulator->max_uV;
 158                 if (*min_uV < regulator->min_uV)
 159                         *min_uV = regulator->min_uV;
 160         }
 161
 162         if (*min_uV > *max_uV)
 163                 return -EINVAL;
 164
 165         return 0;
 166 }
 167
 168 /* current constraint check */
 169 static int regulator_check_current_limit(struct regulator_dev *rdev,
 170                                         int *min_uA, int *max_uA)
 171 {
 172         BUG_ON(*min_uA > *max_uA);
 173
 174         if (!rdev->constraints) {
 175                 rdev_err(rdev, "no constraints\n");
 176                 return -ENODEV;
 177         }
 178         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 179                 rdev_err(rdev, "operation not allowed\n");
 180                 return -EPERM;
 181         }
 182
 183         if (*max_uA > rdev->constraints->max_uA)
 184                 *max_uA = rdev->constraints->max_uA;
 185         if (*min_uA < rdev->constraints->min_uA)
 186                 *min_uA = rdev->constraints->min_uA;
 187
 188         if (*min_uA > *max_uA)
 189                 return -EINVAL;
 190
 191         return 0;
 192 }
 193
 194 /* operating mode constraint check */
 195 static int regulator_check_mode(struct regulator_dev *rdev, int mode)
 196 {
 197         switch (mode) {
 198         case REGULATOR_MODE_FAST:
 199         case REGULATOR_MODE_NORMAL:
 200         case REGULATOR_MODE_IDLE:
 201         case REGULATOR_MODE_STANDBY:
 202                 break;
 203         default:
 204                 return -EINVAL;
 205         }
 206
 207         if (!rdev->constraints) {
 208                 rdev_err(rdev, "no constraints\n");
 209                 return -ENODEV;
 210         }
 211         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 212                 rdev_err(rdev, "operation not allowed\n");
 213                 return -EPERM;
 214         }
 215         if (!(rdev->constraints->valid_modes_mask & mode)) {
 216                 rdev_err(rdev, "invalid mode %x\n", mode);
 217                 return -EINVAL;
 218         }
 219         return 0;
 220 }
 221
 222 /* dynamic regulator mode switching constraint check */
 223 static int regulator_check_drms(struct regulator_dev *rdev)
 224 {
 225         if (!rdev->constraints) {
 226                 rdev_err(rdev, "no constraints\n");
 227                 return -ENODEV;
 228         }
 229         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 230                 rdev_err(rdev, "operation not allowed\n");
 231                 return -EPERM;
 232         }
 233         return 0;
 234 }
 235
 236 static ssize_t device_requested_uA_show(struct device *dev,
 237                              struct device_attribute *attr, char *buf)
 238 {
 239         struct regulator *regulator;
 240
 241         regulator = get_device_regulator(dev);
 242         if (regulator == NULL)
 243                 return 0;
 244
 245         return sprintf(buf, "%d\n", regulator->uA_load);
 246 }
 247
 248 static ssize_t regulator_uV_show(struct device *dev,
 249                                 struct device_attribute *attr, char *buf)
 250 {
 251         struct regulator_dev *rdev = dev_get_drvdata(dev);
 252         ssize_t ret;
 253
 254         mutex_lock(&rdev->mutex);
 255         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 256         mutex_unlock(&rdev->mutex);
 257
 258         return ret;
 259 }
 260 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 261
 262 static ssize_t regulator_uA_show(struct device *dev,
 263                                 struct device_attribute *attr, char *buf)
 264 {
 265         struct regulator_dev *rdev = dev_get_drvdata(dev);
 266
 267         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 268 }
 269 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 270
 271 static ssize_t regulator_name_show(struct device *dev,
 272                              struct device_attribute *attr, char *buf)
 273 {
 274         struct regulator_dev *rdev = dev_get_drvdata(dev);
 275
 276         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 277 }
 278
 279 static ssize_t regulator_print_opmode(char *buf, int mode)
 280 {
 281         switch (mode) {
 282         case REGULATOR_MODE_FAST:
 283                 return sprintf(buf, "fast\n");
 284         case REGULATOR_MODE_NORMAL:
 285                 return sprintf(buf, "normal\n");
 286         case REGULATOR_MODE_IDLE:
 287                 return sprintf(buf, "idle\n");
 288         case REGULATOR_MODE_STANDBY:
 289                 return sprintf(buf, "standby\n");
 290         }
 291         return sprintf(buf, "unknown\n");
 292 }
 293
 294 static ssize_t regulator_opmode_show(struct device *dev,
 295                                     struct device_attribute *attr, char *buf)
 296 {
 297         struct regulator_dev *rdev = dev_get_drvdata(dev);
 298
 299         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 300 }
 301 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 302
 303 static ssize_t regulator_print_state(char *buf, int state)
 304 {
 305         if (state > 0)
 306                 return sprintf(buf, "enabled\n");
 307         else if (state == 0)
 308                 return sprintf(buf, "disabled\n");
 309         else
 310                 return sprintf(buf, "unknown\n");
 311 }
 312
 313 static ssize_t regulator_state_show(struct device *dev,
 314                                    struct device_attribute *attr, char *buf)
 315 {
 316         struct regulator_dev *rdev = dev_get_drvdata(dev);
 317         ssize_t ret;
 318
 319         mutex_lock(&rdev->mutex);
 320         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 321         mutex_unlock(&rdev->mutex);
 322
 323         return ret;
 324 }
 325 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 326
 327 static ssize_t regulator_status_show(struct device *dev,
 328                                    struct device_attribute *attr, char *buf)
 329 {
 330         struct regulator_dev *rdev = dev_get_drvdata(dev);
 331         int status;
 332         char *label;
 333
 334         status = rdev->desc->ops->get_status(rdev);
 335         if (status < 0)
 336                 return status;
 337
 338         switch (status) {
 339         case REGULATOR_STATUS_OFF:
 340                 label = "off";
 341                 break;
 342         case REGULATOR_STATUS_ON:
 343                 label = "on";
 344                 break;
 345         case REGULATOR_STATUS_ERROR:
 346                 label = "error";
 347                 break;
 348         case REGULATOR_STATUS_FAST:
 349                 label = "fast";
 350                 break;
 351         case REGULATOR_STATUS_NORMAL:
 352                 label = "normal";
 353                 break;
 354         case REGULATOR_STATUS_IDLE:
 355                 label = "idle";
 356                 break;
 357         case REGULATOR_STATUS_STANDBY:
 358                 label = "standby";
 359                 break;
 360         default:
 361                 return -ERANGE;
 362         }
 363
 364         return sprintf(buf, "%s\n", label);
 365 }
 366 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 367
 368 static ssize_t regulator_min_uA_show(struct device *dev,
 369                                     struct device_attribute *attr, char *buf)
 370 {
 371         struct regulator_dev *rdev = dev_get_drvdata(dev);
 372
 373         if (!rdev->constraints)
 374                 return sprintf(buf, "constraint not defined\n");
 375
 376         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 377 }
 378 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 379
 380 static ssize_t regulator_max_uA_show(struct device *dev,
 381                                     struct device_attribute *attr, char *buf)
 382 {
 383         struct regulator_dev *rdev = dev_get_drvdata(dev);
 384
 385         if (!rdev->constraints)
 386                 return sprintf(buf, "constraint not defined\n");
 387
 388         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 389 }
 390 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 391
 392 static ssize_t regulator_min_uV_show(struct device *dev,
 393                                     struct device_attribute *attr, char *buf)
 394 {
 395         struct regulator_dev *rdev = dev_get_drvdata(dev);
 396
 397         if (!rdev->constraints)
 398                 return sprintf(buf, "constraint not defined\n");
 399
 400         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 401 }
 402 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 403
 404 static ssize_t regulator_max_uV_show(struct device *dev,
 405                                     struct device_attribute *attr, char *buf)
 406 {
 407         struct regulator_dev *rdev = dev_get_drvdata(dev);
 408
 409         if (!rdev->constraints)
 410                 return sprintf(buf, "constraint not defined\n");
 411
 412         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 413 }
 414 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 415
 416 static ssize_t regulator_total_uA_show(struct device *dev,
 417                                       struct device_attribute *attr, char *buf)
 418 {
 419         struct regulator_dev *rdev = dev_get_drvdata(dev);
 420         struct regulator *regulator;
 421         int uA = 0;
 422
 423         mutex_lock(&rdev->mutex);
 424         list_for_each_entry(regulator, &rdev->consumer_list, list)
 425                 uA += regulator->uA_load;
 426         mutex_unlock(&rdev->mutex);
 427         return sprintf(buf, "%d\n", uA);
 428 }
 429 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 430
 431 static ssize_t regulator_num_users_show(struct device *dev,
 432                                       struct device_attribute *attr, char *buf)
 433 {
 434         struct regulator_dev *rdev = dev_get_drvdata(dev);
 435         return sprintf(buf, "%d\n", rdev->use_count);
 436 }
 437
 438 static ssize_t regulator_type_show(struct device *dev,
 439                                   struct device_attribute *attr, char *buf)
 440 {
 441         struct regulator_dev *rdev = dev_get_drvdata(dev);
 442
 443         switch (rdev->desc->type) {
 444         case REGULATOR_VOLTAGE:
 445                 return sprintf(buf, "voltage\n");
 446         case REGULATOR_CURRENT:
 447                 return sprintf(buf, "current\n");
 448         }
 449         return sprintf(buf, "unknown\n");
 450 }
 451
 452 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 453                                 struct device_attribute *attr, char *buf)
 454 {
 455         struct regulator_dev *rdev = dev_get_drvdata(dev);
 456
 457         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 458 }
 459 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 460                 regulator_suspend_mem_uV_show, NULL);
 461
 462 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 463                                 struct device_attribute *attr, char *buf)
 464 {
 465         struct regulator_dev *rdev = dev_get_drvdata(dev);
 466
 467         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 468 }
 469 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 470                 regulator_suspend_disk_uV_show, NULL);
 471
 472 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 473                                 struct device_attribute *attr, char *buf)
 474 {
 475         struct regulator_dev *rdev = dev_get_drvdata(dev);
 476
 477         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 478 }
 479 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 480                 regulator_suspend_standby_uV_show, NULL);
 481
 482 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 483                                 struct device_attribute *attr, char *buf)
 484 {
 485         struct regulator_dev *rdev = dev_get_drvdata(dev);
 486
 487         return regulator_print_opmode(buf,
 488                 rdev->constraints->state_mem.mode);
 489 }
 490 static DEVICE_ATTR(suspend_mem_mode, 0444,
 491                 regulator_suspend_mem_mode_show, NULL);
 492
 493 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 494                                 struct device_attribute *attr, char *buf)
 495 {
 496         struct regulator_dev *rdev = dev_get_drvdata(dev);
 497
 498         return regulator_print_opmode(buf,
 499                 rdev->constraints->state_disk.mode);
 500 }
 501 static DEVICE_ATTR(suspend_disk_mode, 0444,
 502                 regulator_suspend_disk_mode_show, NULL);
 503
 504 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 505                                 struct device_attribute *attr, char *buf)
 506 {
 507         struct regulator_dev *rdev = dev_get_drvdata(dev);
 508
 509         return regulator_print_opmode(buf,
 510                 rdev->constraints->state_standby.mode);
 511 }
 512 static DEVICE_ATTR(suspend_standby_mode, 0444,
 513                 regulator_suspend_standby_mode_show, NULL);
 514
 515 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 516                                    struct device_attribute *attr, char *buf)
 517 {
 518         struct regulator_dev *rdev = dev_get_drvdata(dev);
 519
 520         return regulator_print_state(buf,
 521                         rdev->constraints->state_mem.enabled);
 522 }
 523 static DEVICE_ATTR(suspend_mem_state, 0444,
 524                 regulator_suspend_mem_state_show, NULL);
 525
 526 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 527                                    struct device_attribute *attr, char *buf)
 528 {
 529         struct regulator_dev *rdev = dev_get_drvdata(dev);
 530
 531         return regulator_print_state(buf,
 532                         rdev->constraints->state_disk.enabled);
 533 }
 534 static DEVICE_ATTR(suspend_disk_state, 0444,
 535                 regulator_suspend_disk_state_show, NULL);
 536
 537 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 538                                    struct device_attribute *attr, char *buf)
 539 {
 540         struct regulator_dev *rdev = dev_get_drvdata(dev);
 541
 542         return regulator_print_state(buf,
 543                         rdev->constraints->state_standby.enabled);
 544 }
 545 static DEVICE_ATTR(suspend_standby_state, 0444,
 546                 regulator_suspend_standby_state_show, NULL);
 547
 548
 549 /*
 550  * These are the only attributes are present for all regulators.
 551  * Other attributes are a function of regulator functionality.
 552  */
 553 static struct device_attribute regulator_dev_attrs[] = {
 554         __ATTR(name, 0444, regulator_name_show, NULL),
 555         __ATTR(num_users, 0444, regulator_num_users_show, NULL),
 556         __ATTR(type, 0444, regulator_type_show, NULL),
 557         __ATTR_NULL,
 558 };
 559
 560 static void regulator_dev_release(struct device *dev)
 561 {
 562         struct regulator_dev *rdev = dev_get_drvdata(dev);
 563         kfree(rdev);
 564 }
 565
 566 static struct class regulator_class = {
 567         .name = "regulator",
 568         .dev_release = regulator_dev_release,
 569         .dev_attrs = regulator_dev_attrs,
 570 };
 571
 572 /* Calculate the new optimum regulator operating mode based on the new total
 573  * consumer load. All locks held by caller */
 574 static void drms_uA_update(struct regulator_dev *rdev)
 575 {
 576         struct regulator *sibling;
 577         int current_uA = 0, output_uV, input_uV, err;
 578         unsigned int mode;
 579
 580         err = regulator_check_drms(rdev);
 581         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 582             (!rdev->desc->ops->get_voltage &&
 583              !rdev->desc->ops->get_voltage_sel) ||
 584             !rdev->desc->ops->set_mode)
 585                 return;
 586
 587         /* get output voltage */
 588         output_uV = _regulator_get_voltage(rdev);
 589         if (output_uV <= 0)
 590                 return;
 591
 592         /* get input voltage */
 593         input_uV = 0;
 594         if (rdev->supply)
 595                 input_uV = _regulator_get_voltage(rdev);
 596         if (input_uV <= 0)
 597                 input_uV = rdev->constraints->input_uV;
 598         if (input_uV <= 0)
 599                 return;
 600
 601         /* calc total requested load */
 602         list_for_each_entry(sibling, &rdev->consumer_list, list)
 603                 current_uA += sibling->uA_load;
 604
 605         /* now get the optimum mode for our new total regulator load */
 606         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 607                                                   output_uV, current_uA);
 608
 609         /* check the new mode is allowed */
 610         err = regulator_check_mode(rdev, mode);
 611         if (err == 0)
 612                 rdev->desc->ops->set_mode(rdev, mode);
 613 }
 614
 615 static int suspend_set_state(struct regulator_dev *rdev,
 616         struct regulator_state *rstate)
 617 {
 618         int ret = 0;
 619         bool can_set_state;
 620
 621         can_set_state = rdev->desc->ops->set_suspend_enable &&
 622                 rdev->desc->ops->set_suspend_disable;
 623
 624         /* If we have no suspend mode configration don't set anything;
 625          * only warn if the driver actually makes the suspend mode
 626          * configurable.
 627          */
 628         if (!rstate->enabled && !rstate->disabled) {
 629                 if (can_set_state)
 630                         rdev_warn(rdev, "No configuration\n");
 631                 return 0;
 632         }
 633
 634         if (rstate->enabled && rstate->disabled) {
 635                 rdev_err(rdev, "invalid configuration\n");
 636                 return -EINVAL;
 637         }
 638
 639         if (!can_set_state) {
 640                 rdev_err(rdev, "no way to set suspend state\n");
 641                 return -EINVAL;
 642         }
 643
 644         if (rstate->enabled)
 645                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 646         else
 647                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 648         if (ret < 0) {
 649                 rdev_err(rdev, "failed to enabled/disable\n");
 650                 return ret;
 651         }
 652
 653         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 654                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 655                 if (ret < 0) {
 656                         rdev_err(rdev, "failed to set voltage\n");
 657                         return ret;
 658                 }
 659         }
 660
 661         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 662                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 663                 if (ret < 0) {
 664                         rdev_err(rdev, "failed to set mode\n");
 665                         return ret;
 666                 }
 667         }
 668         return ret;
 669 }
 670
 671 /* locks held by caller */
 672 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 673 {
 674         if (!rdev->constraints)
 675                 return -EINVAL;
 676
 677         switch (state) {
 678         case PM_SUSPEND_STANDBY:
 679                 return suspend_set_state(rdev,
 680                         &rdev->constraints->state_standby);
 681         case PM_SUSPEND_MEM:
 682                 return suspend_set_state(rdev,
 683                         &rdev->constraints->state_mem);
 684         case PM_SUSPEND_MAX:
 685                 return suspend_set_state(rdev,
 686                         &rdev->constraints->state_disk);
 687         default:
 688                 return -EINVAL;
 689         }
 690 }
 691
 692 static void print_constraints(struct regulator_dev *rdev)
 693 {
 694         struct regulation_constraints *constraints = rdev->constraints;
 695         char buf[80] = "";
 696         int count = 0;
 697         int ret;
 698
 699         if (constraints->min_uV && constraints->max_uV) {
 700                 if (constraints->min_uV == constraints->max_uV)
 701                         count += sprintf(buf + count, "%d mV ",
 702                                          constraints->min_uV / 1000);
 703                 else
 704                         count += sprintf(buf + count, "%d <--> %d mV ",
 705                                          constraints->min_uV / 1000,
 706                                          constraints->max_uV / 1000);
 707         }
 708
 709         if (!constraints->min_uV ||
 710             constraints->min_uV != constraints->max_uV) {
 711                 ret = _regulator_get_voltage(rdev);
 712                 if (ret > 0)
 713                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
 714         }
 715
 716         if (constraints->min_uA && constraints->max_uA) {
 717                 if (constraints->min_uA == constraints->max_uA)
 718                         count += sprintf(buf + count, "%d mA ",
 719                                          constraints->min_uA / 1000);
 720                 else
 721                         count += sprintf(buf + count, "%d <--> %d mA ",
 722                                          constraints->min_uA / 1000,
 723                                          constraints->max_uA / 1000);
 724         }
 725
 726         if (!constraints->min_uA ||
 727             constraints->min_uA != constraints->max_uA) {
 728                 ret = _regulator_get_current_limit(rdev);
 729                 if (ret > 0)
 730                         count += sprintf(buf + count, "at %d mA ", ret / 1000);
 731         }
 732
 733         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 734                 count += sprintf(buf + count, "fast ");
 735         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 736                 count += sprintf(buf + count, "normal ");
 737         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 738                 count += sprintf(buf + count, "idle ");
 739         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 740                 count += sprintf(buf + count, "standby");
 741
 742         rdev_info(rdev, "regulator: %s\n", buf);
 743 }
 744
 745 static int machine_constraints_voltage(struct regulator_dev *rdev,
 746         struct regulation_constraints *constraints)
 747 {
 748         struct regulator_ops *ops = rdev->desc->ops;
 749         int ret;
 750
 751         /* do we need to apply the constraint voltage */
 752         if (rdev->constraints->apply_uV &&
 753             rdev->constraints->min_uV == rdev->constraints->max_uV) {
 754                 ret = _regulator_do_set_voltage(rdev,
 755                                                 rdev->constraints->min_uV,
 756                                                 rdev->constraints->max_uV);
 757                 if (ret < 0) {
 758                         rdev_err(rdev, "failed to apply %duV constraint\n",
 759                                  rdev->constraints->min_uV);
 760                         rdev->constraints = NULL;
 761                         return ret;
 762                 }
 763         }
 764
 765         /* constrain machine-level voltage specs to fit
 766          * the actual range supported by this regulator.
 767          */
 768         if (ops->list_voltage && rdev->desc->n_voltages) {
 769                 int     count = rdev->desc->n_voltages;
 770                 int     i;
 771                 int     min_uV = INT_MAX;
 772                 int     max_uV = INT_MIN;
 773                 int     cmin = constraints->min_uV;
 774                 int     cmax = constraints->max_uV;
 775
 776                 /* it's safe to autoconfigure fixed-voltage supplies
 777                    and the constraints are used by list_voltage. */
 778                 if (count == 1 && !cmin) {
 779                         cmin = 1;
 780                         cmax = INT_MAX;
 781                         constraints->min_uV = cmin;
 782                         constraints->max_uV = cmax;
 783                 }
 784
 785                 /* voltage constraints are optional */
 786                 if ((cmin == 0) && (cmax == 0))
 787                         return 0;
 788
 789                 /* else require explicit machine-level constraints */
 790                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 791                         rdev_err(rdev, "invalid voltage constraints\n");
 792                         return -EINVAL;
 793                 }
 794
 795                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 796                 for (i = 0; i < count; i++) {
 797                         int     value;
 798
 799                         value = ops->list_voltage(rdev, i);
 800                         if (value <= 0)
 801                                 continue;
 802
 803                         /* maybe adjust [min_uV..max_uV] */
 804                         if (value >= cmin && value < min_uV)
 805                                 min_uV = value;
 806                         if (value <= cmax && value > max_uV)
 807                                 max_uV = value;
 808                 }
 809
 810                 /* final: [min_uV..max_uV] valid iff constraints valid */
 811                 if (max_uV < min_uV) {
 812                         rdev_err(rdev, "unsupportable voltage constraints\n");
 813                         return -EINVAL;
 814                 }
 815
 816                 /* use regulator's subset of machine constraints */
 817                 if (constraints->min_uV < min_uV) {
 818                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
 819                                  constraints->min_uV, min_uV);
 820                         constraints->min_uV = min_uV;
 821                 }
 822                 if (constraints->max_uV > max_uV) {
 823                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
 824                                  constraints->max_uV, max_uV);
 825                         constraints->max_uV = max_uV;
 826                 }
 827         }
 828
 829         return 0;
 830 }
 831
 832 /**
 833  * set_machine_constraints - sets regulator constraints
 834  * @rdev: regulator source
 835  * @constraints: constraints to apply
 836  *
 837  * Allows platform initialisation code to define and constrain
 838  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 839  * Constraints *must* be set by platform code in order for some
 840  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 841  * set_mode.
 842  */
 843 static int set_machine_constraints(struct regulator_dev *rdev,
 844         const struct regulation_constraints *constraints)
 845 {
 846         int ret = 0;
 847         struct regulator_ops *ops = rdev->desc->ops;
 848
 849         rdev->constraints = kmemdup(constraints, sizeof(*constraints),
 850                                     GFP_KERNEL);
 851         if (!rdev->constraints)
 852                 return -ENOMEM;
 853
 854         ret = machine_constraints_voltage(rdev, rdev->constraints);
 855         if (ret != 0)
 856                 goto out;
 857
 858         /* do we need to setup our suspend state */
 859         if (constraints->initial_state) {
 860                 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
 861                 if (ret < 0) {
 862                         rdev_err(rdev, "failed to set suspend state\n");
 863                         rdev->constraints = NULL;
 864                         goto out;
 865                 }
 866         }
 867
 868         if (constraints->initial_mode) {
 869                 if (!ops->set_mode) {
 870                         rdev_err(rdev, "no set_mode operation\n");
 871                         ret = -EINVAL;
 872                         goto out;
 873                 }
 874
 875                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
 876                 if (ret < 0) {
 877                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
 878                         goto out;
 879                 }
 880         }
 881
 882         /* If the constraints say the regulator should be on at this point
 883          * and we have control then make sure it is enabled.
 884          */
 885         if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
 886             ops->enable) {
 887                 ret = ops->enable(rdev);
 888                 if (ret < 0) {
 889                         rdev_err(rdev, "failed to enable\n");
 890                         rdev->constraints = NULL;
 891                         goto out;
 892                 }
 893         }
 894
 895         print_constraints(rdev);
 896 out:
 897         return ret;
 898 }
 899
 900 /**
 901  * set_supply - set regulator supply regulator
 902  * @rdev: regulator name
 903  * @supply_rdev: supply regulator name
 904  *
 905  * Called by platform initialisation code to set the supply regulator for this
 906  * regulator. This ensures that a regulators supply will also be enabled by the
 907  * core if it's child is enabled.
 908  */
 909 static int set_supply(struct regulator_dev *rdev,
 910         struct regulator_dev *supply_rdev)
 911 {
 912         int err;
 913
 914         err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
 915                                 "supply");
 916         if (err) {
 917                 rdev_err(rdev, "could not add device link %s err %d\n",
 918                          supply_rdev->dev.kobj.name, err);
 919                        goto out;
 920         }
 921         rdev->supply = supply_rdev;
 922         list_add(&rdev->slist, &supply_rdev->supply_list);
 923 out:
 924         return err;
 925 }
 926
 927 /**
 928  * set_consumer_device_supply - Bind a regulator to a symbolic supply
 929  * @rdev:         regulator source
 930  * @consumer_dev: device the supply applies to
 931  * @consumer_dev_name: dev_name() string for device supply applies to
 932  * @supply:       symbolic name for supply
 933  *
 934  * Allows platform initialisation code to map physical regulator
 935  * sources to symbolic names for supplies for use by devices.  Devices
 936  * should use these symbolic names to request regulators, avoiding the
 937  * need to provide board-specific regulator names as platform data.
 938  *
 939  * Only one of consumer_dev and consumer_dev_name may be specified.
 940  */
 941 static int set_consumer_device_supply(struct regulator_dev *rdev,
 942         struct device *consumer_dev, const char *consumer_dev_name,
 943         const char *supply)
 944 {
 945         struct regulator_map *node;
 946         int has_dev;
 947
 948         if (consumer_dev && consumer_dev_name)
 949                 return -EINVAL;
 950
 951         if (!consumer_dev_name && consumer_dev)
 952                 consumer_dev_name = dev_name(consumer_dev);
 953
 954         if (supply == NULL)
 955                 return -EINVAL;
 956
 957         if (consumer_dev_name != NULL)
 958                 has_dev = 1;
 959         else
 960                 has_dev = 0;
 961
 962         list_for_each_entry(node, &regulator_map_list, list) {
 963                 if (node->dev_name && consumer_dev_name) {
 964                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
 965                                 continue;
 966                 } else if (node->dev_name || consumer_dev_name) {
 967                         continue;
 968                 }
 969
 970                 if (strcmp(node->supply, supply) != 0)
 971                         continue;
 972
 973                 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
 974                         dev_name(&node->regulator->dev),
 975                         node->regulator->desc->name,
 976                         supply,
 977                         dev_name(&rdev->dev), rdev_get_name(rdev));
 978                 return -EBUSY;
 979         }
 980
 981         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
 982         if (node == NULL)
 983                 return -ENOMEM;
 984
 985         node->regulator = rdev;
 986         node->supply = supply;
 987
 988         if (has_dev) {
 989                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
 990                 if (node->dev_name == NULL) {
 991                         kfree(node);
 992                         return -ENOMEM;
 993                 }
 994         }
 995
 996         list_add(&node->list, &regulator_map_list);
 997         return 0;
 998 }
 999
1000 static void unset_regulator_supplies(struct regulator_dev *rdev)
1001 {
1002         struct regulator_map *node, *n;
1003
1004         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1005                 if (rdev == node->regulator) {
1006                         list_del(&node->list);
1007                         kfree(node->dev_name);
1008                         kfree(node);
1009                 }
1010         }
1011 }
1012
1013 #define REG_STR_SIZE    32
1014
1015 static struct regulator *create_regulator(struct regulator_dev *rdev,
1016                                           struct device *dev,
1017                                           const char *supply_name)
1018 {
1019         struct regulator *regulator;
1020         char buf[REG_STR_SIZE];
1021         int err, size;
1022
1023         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1024         if (regulator == NULL)
1025                 return NULL;
1026
1027         mutex_lock(&rdev->mutex);
1028         regulator->rdev = rdev;
1029         list_add(&regulator->list, &rdev->consumer_list);
1030
1031         if (dev) {
1032                 /* create a 'requested_microamps_name' sysfs entry */
1033                 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
1034                         supply_name);
1035                 if (size >= REG_STR_SIZE)
1036                         goto overflow_err;
1037
1038                 regulator->dev = dev;
1039                 sysfs_attr_init(&regulator->dev_attr.attr);
1040                 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1041                 if (regulator->dev_attr.attr.name == NULL)
1042                         goto attr_name_err;
1043
1044                 regulator->dev_attr.attr.mode = 0444;
1045                 regulator->dev_attr.show = device_requested_uA_show;
1046                 err = device_create_file(dev, &regulator->dev_attr);
1047                 if (err < 0) {
1048                         rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
1049                         goto attr_name_err;
1050                 }
1051
1052                 /* also add a link to the device sysfs entry */
1053                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1054                                  dev->kobj.name, supply_name);
1055                 if (size >= REG_STR_SIZE)
1056                         goto attr_err;
1057
1058                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1059                 if (regulator->supply_name == NULL)
1060                         goto attr_err;
1061
1062                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1063                                         buf);
1064                 if (err) {
1065                         rdev_warn(rdev, "could not add device link %s err %d\n",
1066                                   dev->kobj.name, err);
1067                         goto link_name_err;
1068                 }
1069         }
1070         mutex_unlock(&rdev->mutex);
1071         return regulator;
1072 link_name_err:
1073         kfree(regulator->supply_name);
1074 attr_err:
1075         device_remove_file(regulator->dev, &regulator->dev_attr);
1076 attr_name_err:
1077         kfree(regulator->dev_attr.attr.name);
1078 overflow_err:
1079         list_del(&regulator->list);
1080         kfree(regulator);
1081         mutex_unlock(&rdev->mutex);
1082         return NULL;
1083 }
1084
1085 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1086 {
1087         if (!rdev->desc->ops->enable_time)
1088                 return 0;
1089         return rdev->desc->ops->enable_time(rdev);
1090 }
1091
1092 /* Internal regulator request function */
1093 static struct regulator *_regulator_get(struct device *dev, const char *id,
1094                                         int exclusive)
1095 {
1096         struct regulator_dev *rdev;
1097         struct regulator_map *map;
1098         struct regulator *regulator = ERR_PTR(-ENODEV);
1099         const char *devname = NULL;
1100         int ret;
1101
1102         if (id == NULL) {
1103                 pr_err("get() with no identifier\n");
1104                 return regulator;
1105         }
1106
1107         if (dev)
1108                 devname = dev_name(dev);
1109
1110         mutex_lock(&regulator_list_mutex);
1111
1112         list_for_each_entry(map, &regulator_map_list, list) {
1113                 /* If the mapping has a device set up it must match */
1114                 if (map->dev_name &&
1115                     (!devname || strcmp(map->dev_name, devname)))
1116                         continue;
1117
1118                 if (strcmp(map->supply, id) == 0) {
1119                         rdev = map->regulator;
1120                         goto found;
1121                 }
1122         }
1123
1124         if (board_wants_dummy_regulator) {
1125                 rdev = dummy_regulator_rdev;
1126                 goto found;
1127         }
1128
1129 #ifdef CONFIG_REGULATOR_DUMMY
1130         if (!devname)
1131                 devname = "deviceless";
1132
1133         /* If the board didn't flag that it was fully constrained then
1134          * substitute in a dummy regulator so consumers can continue.
1135          */
1136         if (!has_full_constraints) {
1137                 pr_warn("%s supply %s not found, using dummy regulator\n",
1138                         devname, id);
1139                 rdev = dummy_regulator_rdev;
1140                 goto found;
1141         }
1142 #endif
1143
1144         mutex_unlock(&regulator_list_mutex);
1145         return regulator;
1146
1147 found:
1148         if (rdev->exclusive) {
1149                 regulator = ERR_PTR(-EPERM);
1150                 goto out;
1151         }
1152
1153         if (exclusive && rdev->open_count) {
1154                 regulator = ERR_PTR(-EBUSY);
1155                 goto out;
1156         }
1157
1158         if (!try_module_get(rdev->owner))
1159                 goto out;
1160
1161         regulator = create_regulator(rdev, dev, id);
1162         if (regulator == NULL) {
1163                 regulator = ERR_PTR(-ENOMEM);
1164                 module_put(rdev->owner);
1165         }
1166
1167         rdev->open_count++;
1168         if (exclusive) {
1169                 rdev->exclusive = 1;
1170
1171                 ret = _regulator_is_enabled(rdev);
1172                 if (ret > 0)
1173                         rdev->use_count = 1;
1174                 else
1175                         rdev->use_count = 0;
1176         }
1177
1178 out:
1179         mutex_unlock(&regulator_list_mutex);
1180
1181         return regulator;
1182 }
1183
1184 /**
1185  * regulator_get - lookup and obtain a reference to a regulator.
1186  * @dev: device for regulator "consumer"
1187  * @id: Supply name or regulator ID.
1188  *
1189  * Returns a struct regulator corresponding to the regulator producer,
1190  * or IS_ERR() condition containing errno.
1191  *
1192  * Use of supply names configured via regulator_set_device_supply() is
1193  * strongly encouraged.  It is recommended that the supply name used
1194  * should match the name used for the supply and/or the relevant
1195  * device pins in the datasheet.
1196  */
1197 struct regulator *regulator_get(struct device *dev, const char *id)
1198 {
1199         return _regulator_get(dev, id, 0);
1200 }
1201 EXPORT_SYMBOL_GPL(regulator_get);
1202
1203 /**
1204  * regulator_get_exclusive - obtain exclusive access to a regulator.
1205  * @dev: device for regulator "consumer"
1206  * @id: Supply name or regulator ID.
1207  *
1208  * Returns a struct regulator corresponding to the regulator producer,
1209  * or IS_ERR() condition containing errno.  Other consumers will be
1210  * unable to obtain this reference is held and the use count for the
1211  * regulator will be initialised to reflect the current state of the
1212  * regulator.
1213  *
1214  * This is intended for use by consumers which cannot tolerate shared
1215  * use of the regulator such as those which need to force the
1216  * regulator off for correct operation of the hardware they are
1217  * controlling.
1218  *
1219  * Use of supply names configured via regulator_set_device_supply() is
1220  * strongly encouraged.  It is recommended that the supply name used
1221  * should match the name used for the supply and/or the relevant
1222  * device pins in the datasheet.
1223  */
1224 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1225 {
1226         return _regulator_get(dev, id, 1);
1227 }
1228 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1229
1230 /**
1231  * regulator_put - "free" the regulator source
1232  * @regulator: regulator source
1233  *
1234  * Note: drivers must ensure that all regulator_enable calls made on this
1235  * regulator source are balanced by regulator_disable calls prior to calling
1236  * this function.
1237  */
1238 void regulator_put(struct regulator *regulator)
1239 {
1240         struct regulator_dev *rdev;
1241
1242         if (regulator == NULL || IS_ERR(regulator))
1243                 return;
1244
1245         mutex_lock(&regulator_list_mutex);
1246         rdev = regulator->rdev;
1247
1248         /* remove any sysfs entries */
1249         if (regulator->dev) {
1250                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1251                 kfree(regulator->supply_name);
1252                 device_remove_file(regulator->dev, &regulator->dev_attr);
1253                 kfree(regulator->dev_attr.attr.name);
1254         }
1255         list_del(&regulator->list);
1256         kfree(regulator);
1257
1258         rdev->open_count--;
1259         rdev->exclusive = 0;
1260
1261         module_put(rdev->owner);
1262         mutex_unlock(&regulator_list_mutex);
1263 }
1264 EXPORT_SYMBOL_GPL(regulator_put);
1265
1266 static int _regulator_can_change_status(struct regulator_dev *rdev)
1267 {
1268         if (!rdev->constraints)
1269                 return 0;
1270
1271         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1272                 return 1;
1273         else
1274                 return 0;
1275 }
1276
1277 /* locks held by regulator_enable() */
1278 static int _regulator_enable(struct regulator_dev *rdev)
1279 {
1280         int ret, delay;
1281
1282         if (rdev->use_count == 0) {
1283                 /* do we need to enable the supply regulator first */
1284                 if (rdev->supply) {
1285                         mutex_lock(&rdev->supply->mutex);
1286                         ret = _regulator_enable(rdev->supply);
1287                         mutex_unlock(&rdev->supply->mutex);
1288                         if (ret < 0) {
1289                                 rdev_err(rdev, "failed to enable: %d\n", ret);
1290                                 return ret;
1291                         }
1292                 }
1293         }
1294
1295         /* check voltage and requested load before enabling */
1296         if (rdev->constraints &&
1297             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1298                 drms_uA_update(rdev);
1299
1300         if (rdev->use_count == 0) {
1301                 /* The regulator may on if it's not switchable or left on */
1302                 ret = _regulator_is_enabled(rdev);
1303                 if (ret == -EINVAL || ret == 0) {
1304                         if (!_regulator_can_change_status(rdev))
1305                                 return -EPERM;
1306
1307                         if (!rdev->desc->ops->enable)
1308                                 return -EINVAL;
1309
1310                         /* Query before enabling in case configuration
1311                          * dependant.  */
1312                         ret = _regulator_get_enable_time(rdev);
1313                         if (ret >= 0) {
1314                                 delay = ret;
1315                         } else {
1316                                 rdev_warn(rdev, "enable_time() failed: %d\n",
1317                                            ret);
1318                                 delay = 0;
1319                         }
1320
1321                         trace_regulator_enable(rdev_get_name(rdev));
1322
1323                         /* Allow the regulator to ramp; it would be useful
1324                          * to extend this for bulk operations so that the
1325                          * regulators can ramp together.  */
1326                         ret = rdev->desc->ops->enable(rdev);
1327                         if (ret < 0)
1328                                 return ret;
1329
1330                         trace_regulator_enable_delay(rdev_get_name(rdev));
1331
1332                         if (delay >= 1000) {
1333                                 mdelay(delay / 1000);
1334                                 udelay(delay % 1000);
1335                         } else if (delay) {
1336                                 udelay(delay);
1337                         }
1338
1339                         trace_regulator_enable_complete(rdev_get_name(rdev));
1340
1341                 } else if (ret < 0) {
1342                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1343                         return ret;
1344                 }
1345                 /* Fallthrough on positive return values - already enabled */
1346         }
1347
1348         rdev->use_count++;
1349
1350         return 0;
1351 }
1352
1353 /**
1354  * regulator_enable - enable regulator output
1355  * @regulator: regulator source
1356  *
1357  * Request that the regulator be enabled with the regulator output at
1358  * the predefined voltage or current value.  Calls to regulator_enable()
1359  * must be balanced with calls to regulator_disable().
1360  *
1361  * NOTE: the output value can be set by other drivers, boot loader or may be
1362  * hardwired in the regulator.
1363  */
1364 int regulator_enable(struct regulator *regulator)
1365 {
1366         struct regulator_dev *rdev = regulator->rdev;
1367         int ret = 0;
1368
1369         mutex_lock(&rdev->mutex);
1370         ret = _regulator_enable(rdev);
1371         mutex_unlock(&rdev->mutex);
1372         return ret;
1373 }
1374 EXPORT_SYMBOL_GPL(regulator_enable);
1375
1376 /* locks held by regulator_disable() */
1377 static int _regulator_disable(struct regulator_dev *rdev,
1378                 struct regulator_dev **supply_rdev_ptr)
1379 {
1380         int ret = 0;
1381         *supply_rdev_ptr = NULL;
1382
1383         if (WARN(rdev->use_count <= 0,
1384                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
1385                 return -EIO;
1386
1387         /* are we the last user and permitted to disable ? */
1388         if (rdev->use_count == 1 &&
1389             (rdev->constraints && !rdev->constraints->always_on)) {
1390
1391                 /* we are last user */
1392                 if (_regulator_can_change_status(rdev) &&
1393                     rdev->desc->ops->disable) {
1394                         trace_regulator_disable(rdev_get_name(rdev));
1395
1396                         ret = rdev->desc->ops->disable(rdev);
1397                         if (ret < 0) {
1398                                 rdev_err(rdev, "failed to disable\n");
1399                                 return ret;
1400                         }
1401
1402                         trace_regulator_disable_complete(rdev_get_name(rdev));
1403
1404                         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1405                                              NULL);
1406                 }
1407
1408                 /* decrease our supplies ref count and disable if required */
1409                 *supply_rdev_ptr = rdev->supply;
1410
1411                 rdev->use_count = 0;
1412         } else if (rdev->use_count > 1) {
1413
1414                 if (rdev->constraints &&
1415                         (rdev->constraints->valid_ops_mask &
1416                         REGULATOR_CHANGE_DRMS))
1417                         drms_uA_update(rdev);
1418
1419                 rdev->use_count--;
1420         }
1421         return ret;
1422 }
1423
1424 /**
1425  * regulator_disable - disable regulator output
1426  * @regulator: regulator source
1427  *
1428  * Disable the regulator output voltage or current.  Calls to
1429  * regulator_enable() must be balanced with calls to
1430  * regulator_disable().
1431  *
1432  * NOTE: this will only disable the regulator output if no other consumer
1433  * devices have it enabled, the regulator device supports disabling and
1434  * machine constraints permit this operation.
1435  */
1436 int regulator_disable(struct regulator *regulator)
1437 {
1438         struct regulator_dev *rdev = regulator->rdev;
1439         struct regulator_dev *supply_rdev = NULL;
1440         int ret = 0;
1441
1442         mutex_lock(&rdev->mutex);
1443         ret = _regulator_disable(rdev, &supply_rdev);
1444         mutex_unlock(&rdev->mutex);
1445
1446         /* decrease our supplies ref count and disable if required */
1447         while (supply_rdev != NULL) {
1448                 rdev = supply_rdev;
1449
1450                 mutex_lock(&rdev->mutex);
1451                 _regulator_disable(rdev, &supply_rdev);
1452                 mutex_unlock(&rdev->mutex);
1453         }
1454
1455         return ret;
1456 }
1457 EXPORT_SYMBOL_GPL(regulator_disable);
1458
1459 /* locks held by regulator_force_disable() */
1460 static int _regulator_force_disable(struct regulator_dev *rdev,
1461                 struct regulator_dev **supply_rdev_ptr)
1462 {
1463         int ret = 0;
1464
1465         /* force disable */
1466         if (rdev->desc->ops->disable) {
1467                 /* ah well, who wants to live forever... */
1468                 ret = rdev->desc->ops->disable(rdev);
1469                 if (ret < 0) {
1470                         rdev_err(rdev, "failed to force disable\n");
1471                         return ret;
1472                 }
1473                 /* notify other consumers that power has been forced off */
1474                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1475                         REGULATOR_EVENT_DISABLE, NULL);
1476         }
1477
1478         /* decrease our supplies ref count and disable if required */
1479         *supply_rdev_ptr = rdev->supply;
1480
1481         rdev->use_count = 0;
1482         return ret;
1483 }
1484
1485 /**
1486  * regulator_force_disable - force disable regulator output
1487  * @regulator: regulator source
1488  *
1489  * Forcibly disable the regulator output voltage or current.
1490  * NOTE: this *will* disable the regulator output even if other consumer
1491  * devices have it enabled. This should be used for situations when device
1492  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1493  */
1494 int regulator_force_disable(struct regulator *regulator)
1495 {
1496         struct regulator_dev *supply_rdev = NULL;
1497         int ret;
1498
1499         mutex_lock(&regulator->rdev->mutex);
1500         regulator->uA_load = 0;
1501         ret = _regulator_force_disable(regulator->rdev, &supply_rdev);
1502         mutex_unlock(&regulator->rdev->mutex);
1503
1504         if (supply_rdev)
1505                 regulator_disable(get_device_regulator(rdev_get_dev(supply_rdev)));
1506
1507         return ret;
1508 }
1509 EXPORT_SYMBOL_GPL(regulator_force_disable);
1510
1511 static int _regulator_is_enabled(struct regulator_dev *rdev)
1512 {
1513         /* If we don't know then assume that the regulator is always on */
1514         if (!rdev->desc->ops->is_enabled)
1515                 return 1;
1516
1517         return rdev->desc->ops->is_enabled(rdev);
1518 }
1519
1520 /**
1521  * regulator_is_enabled - is the regulator output enabled
1522  * @regulator: regulator source
1523  *
1524  * Returns positive if the regulator driver backing the source/client
1525  * has requested that the device be enabled, zero if it hasn't, else a
1526  * negative errno code.
1527  *
1528  * Note that the device backing this regulator handle can have multiple
1529  * users, so it might be enabled even if regulator_enable() was never
1530  * called for this particular source.
1531  */
1532 int regulator_is_enabled(struct regulator *regulator)
1533 {
1534         int ret;
1535
1536         mutex_lock(&regulator->rdev->mutex);
1537         ret = _regulator_is_enabled(regulator->rdev);
1538         mutex_unlock(&regulator->rdev->mutex);
1539
1540         return ret;
1541 }
1542 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1543
1544 /**
1545  * regulator_count_voltages - count regulator_list_voltage() selectors
1546  * @regulator: regulator source
1547  *
1548  * Returns number of selectors, or negative errno.  Selectors are
1549  * numbered starting at zero, and typically correspond to bitfields
1550  * in hardware registers.
1551  */
1552 int regulator_count_voltages(struct regulator *regulator)
1553 {
1554         struct regulator_dev    *rdev = regulator->rdev;
1555
1556         return rdev->desc->n_voltages ? : -EINVAL;
1557 }
1558 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1559
1560 /**
1561  * regulator_list_voltage - enumerate supported voltages
1562  * @regulator: regulator source
1563  * @selector: identify voltage to list
1564  * Context: can sleep
1565  *
1566  * Returns a voltage that can be passed to @regulator_set_voltage(),
1567  * zero if this selector code can't be used on this system, or a
1568  * negative errno.
1569  */
1570 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1571 {
1572         struct regulator_dev    *rdev = regulator->rdev;
1573         struct regulator_ops    *ops = rdev->desc->ops;
1574         int                     ret;
1575
1576         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1577                 return -EINVAL;
1578
1579         mutex_lock(&rdev->mutex);
1580         ret = ops->list_voltage(rdev, selector);
1581         mutex_unlock(&rdev->mutex);
1582
1583         if (ret > 0) {
1584                 if (ret < rdev->constraints->min_uV)
1585                         ret = 0;
1586                 else if (ret > rdev->constraints->max_uV)
1587                         ret = 0;
1588         }
1589
1590         return ret;
1591 }
1592 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1593
1594 /**
1595  * regulator_is_supported_voltage - check if a voltage range can be supported
1596  *
1597  * @regulator: Regulator to check.
1598  * @min_uV: Minimum required voltage in uV.
1599  * @max_uV: Maximum required voltage in uV.
1600  *
1601  * Returns a boolean or a negative error code.
1602  */
1603 int regulator_is_supported_voltage(struct regulator *regulator,
1604                                    int min_uV, int max_uV)
1605 {
1606         int i, voltages, ret;
1607
1608         ret = regulator_count_voltages(regulator);
1609         if (ret < 0)
1610                 return ret;
1611         voltages = ret;
1612
1613         for (i = 0; i < voltages; i++) {
1614                 ret = regulator_list_voltage(regulator, i);
1615
1616                 if (ret >= min_uV && ret <= max_uV)
1617                         return 1;
1618         }
1619
1620         return 0;
1621 }
1622
1623 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
1624                                      int min_uV, int max_uV)
1625 {
1626         int ret;
1627         unsigned int selector;
1628
1629         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
1630
1631         if (rdev->desc->ops->set_voltage) {
1632                 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
1633                                                    &selector);
1634
1635                 if (rdev->desc->ops->list_voltage)
1636                         selector = rdev->desc->ops->list_voltage(rdev,
1637                                                                  selector);
1638                 else
1639                         selector = -1;
1640         } else if (rdev->desc->ops->set_voltage_sel) {
1641                 int best_val = INT_MAX;
1642                 int i;
1643
1644                 selector = 0;
1645
1646                 /* Find the smallest voltage that falls within the specified
1647                  * range.
1648                  */
1649                 for (i = 0; i < rdev->desc->n_voltages; i++) {
1650                         ret = rdev->desc->ops->list_voltage(rdev, i);
1651                         if (ret < 0)
1652                                 continue;
1653
1654                         if (ret < best_val && ret >= min_uV && ret <= max_uV) {
1655                                 best_val = ret;
1656                                 selector = i;
1657                         }
1658                 }
1659
1660                 if (best_val != INT_MAX) {
1661                         ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
1662                         selector = best_val;
1663                 } else {
1664                         ret = -EINVAL;
1665                 }
1666         } else {
1667                 ret = -EINVAL;
1668         }
1669
1670         if (ret == 0)
1671                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
1672                                      NULL);
1673
1674         trace_regulator_set_voltage_complete(rdev_get_name(rdev), selector);
1675
1676         return ret;
1677 }
1678
1679 /**
1680  * regulator_set_voltage - set regulator output voltage
1681  * @regulator: regulator source
1682  * @min_uV: Minimum required voltage in uV
1683  * @max_uV: Maximum acceptable voltage in uV
1684  *
1685  * Sets a voltage regulator to the desired output voltage. This can be set
1686  * during any regulator state. IOW, regulator can be disabled or enabled.
1687  *
1688  * If the regulator is enabled then the voltage will change to the new value
1689  * immediately otherwise if the regulator is disabled the regulator will
1690  * output at the new voltage when enabled.
1691  *
1692  * NOTE: If the regulator is shared between several devices then the lowest
1693  * request voltage that meets the system constraints will be used.
1694  * Regulator system constraints must be set for this regulator before
1695  * calling this function otherwise this call will fail.
1696  */
1697 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1698 {
1699         struct regulator_dev *rdev = regulator->rdev;
1700         int ret = 0;
1701
1702         mutex_lock(&rdev->mutex);
1703
1704         /* If we're setting the same range as last time the change
1705          * should be a noop (some cpufreq implementations use the same
1706          * voltage for multiple frequencies, for example).
1707          */
1708         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
1709                 goto out;
1710
1711         /* sanity check */
1712         if (!rdev->desc->ops->set_voltage &&
1713             !rdev->desc->ops->set_voltage_sel) {
1714                 ret = -EINVAL;
1715                 goto out;
1716         }
1717
1718         /* constraints check */
1719         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1720         if (ret < 0)
1721                 goto out;
1722         regulator->min_uV = min_uV;
1723         regulator->max_uV = max_uV;
1724
1725         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1726         if (ret < 0)
1727                 goto out;
1728
1729         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
1730
1731 out:
1732         mutex_unlock(&rdev->mutex);
1733         return ret;
1734 }
1735 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1736
1737 /**
1738  * regulator_sync_voltage - re-apply last regulator output voltage
1739  * @regulator: regulator source
1740  *
1741  * Re-apply the last configured voltage.  This is intended to be used
1742  * where some external control source the consumer is cooperating with
1743  * has caused the configured voltage to change.
1744  */
1745 int regulator_sync_voltage(struct regulator *regulator)
1746 {
1747         struct regulator_dev *rdev = regulator->rdev;
1748         int ret, min_uV, max_uV;
1749
1750         mutex_lock(&rdev->mutex);
1751
1752         if (!rdev->desc->ops->set_voltage &&
1753             !rdev->desc->ops->set_voltage_sel) {
1754                 ret = -EINVAL;
1755                 goto out;
1756         }
1757
1758         /* This is only going to work if we've had a voltage configured. */
1759         if (!regulator->min_uV && !regulator->max_uV) {
1760                 ret = -EINVAL;
1761                 goto out;
1762         }
1763
1764         min_uV = regulator->min_uV;
1765         max_uV = regulator->max_uV;
1766
1767         /* This should be a paranoia check... */
1768         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1769         if (ret < 0)
1770                 goto out;
1771
1772         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
1773         if (ret < 0)
1774                 goto out;
1775
1776         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
1777
1778 out:
1779         mutex_unlock(&rdev->mutex);
1780         return ret;
1781 }
1782 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
1783
1784 static int _regulator_get_voltage(struct regulator_dev *rdev)
1785 {
1786         int sel;
1787
1788         if (rdev->desc->ops->get_voltage_sel) {
1789                 sel = rdev->desc->ops->get_voltage_sel(rdev);
1790                 if (sel < 0)
1791                         return sel;
1792                 return rdev->desc->ops->list_voltage(rdev, sel);
1793         }
1794         if (rdev->desc->ops->get_voltage)
1795                 return rdev->desc->ops->get_voltage(rdev);
1796         else
1797                 return -EINVAL;
1798 }
1799
1800 /**
1801  * regulator_get_voltage - get regulator output voltage
1802  * @regulator: regulator source
1803  *
1804  * This returns the current regulator voltage in uV.
1805  *
1806  * NOTE: If the regulator is disabled it will return the voltage value. This
1807  * function should not be used to determine regulator state.
1808  */
1809 int regulator_get_voltage(struct regulator *regulator)
1810 {
1811         int ret;
1812
1813         mutex_lock(&regulator->rdev->mutex);
1814
1815         ret = _regulator_get_voltage(regulator->rdev);
1816
1817         mutex_unlock(&regulator->rdev->mutex);
1818
1819         return ret;
1820 }
1821 EXPORT_SYMBOL_GPL(regulator_get_voltage);
1822
1823 /**
1824  * regulator_set_current_limit - set regulator output current limit
1825  * @regulator: regulator source
1826  * @min_uA: Minimuum supported current in uA
1827  * @max_uA: Maximum supported current in uA
1828  *
1829  * Sets current sink to the desired output current. This can be set during
1830  * any regulator state. IOW, regulator can be disabled or enabled.
1831  *
1832  * If the regulator is enabled then the current will change to the new value
1833  * immediately otherwise if the regulator is disabled the regulator will
1834  * output at the new current when enabled.
1835  *
1836  * NOTE: Regulator system constraints must be set for this regulator before
1837  * calling this function otherwise this call will fail.
1838  */
1839 int regulator_set_current_limit(struct regulator *regulator,
1840                                int min_uA, int max_uA)
1841 {
1842         struct regulator_dev *rdev = regulator->rdev;
1843         int ret;
1844
1845         mutex_lock(&rdev->mutex);
1846
1847         /* sanity check */
1848         if (!rdev->desc->ops->set_current_limit) {
1849                 ret = -EINVAL;
1850                 goto out;
1851         }
1852
1853         /* constraints check */
1854         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1855         if (ret < 0)
1856                 goto out;
1857
1858         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1859 out:
1860         mutex_unlock(&rdev->mutex);
1861         return ret;
1862 }
1863 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1864
1865 static int _regulator_get_current_limit(struct regulator_dev *rdev)
1866 {
1867         int ret;
1868
1869         mutex_lock(&rdev->mutex);
1870
1871         /* sanity check */
1872         if (!rdev->desc->ops->get_current_limit) {
1873                 ret = -EINVAL;
1874                 goto out;
1875         }
1876
1877         ret = rdev->desc->ops->get_current_limit(rdev);
1878 out:
1879         mutex_unlock(&rdev->mutex);
1880         return ret;
1881 }
1882
1883 /**
1884  * regulator_get_current_limit - get regulator output current
1885  * @regulator: regulator source
1886  *
1887  * This returns the current supplied by the specified current sink in uA.
1888  *
1889  * NOTE: If the regulator is disabled it will return the current value. This
1890  * function should not be used to determine regulator state.
1891  */
1892 int regulator_get_current_limit(struct regulator *regulator)
1893 {
1894         return _regulator_get_current_limit(regulator->rdev);
1895 }
1896 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1897
1898 /**
1899  * regulator_set_mode - set regulator operating mode
1900  * @regulator: regulator source
1901  * @mode: operating mode - one of the REGULATOR_MODE constants
1902  *
1903  * Set regulator operating mode to increase regulator efficiency or improve
1904  * regulation performance.
1905  *
1906  * NOTE: Regulator system constraints must be set for this regulator before
1907  * calling this function otherwise this call will fail.
1908  */
1909 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1910 {
1911         struct regulator_dev *rdev = regulator->rdev;
1912         int ret;
1913         int regulator_curr_mode;
1914
1915         mutex_lock(&rdev->mutex);
1916
1917         /* sanity check */
1918         if (!rdev->desc->ops->set_mode) {
1919                 ret = -EINVAL;
1920                 goto out;
1921         }
1922
1923         /* return if the same mode is requested */
1924         if (rdev->desc->ops->get_mode) {
1925                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
1926                 if (regulator_curr_mode == mode) {
1927                         ret = 0;
1928                         goto out;
1929                 }
1930         }
1931
1932         /* constraints check */
1933         ret = regulator_check_mode(rdev, mode);
1934         if (ret < 0)
1935                 goto out;
1936
1937         ret = rdev->desc->ops->set_mode(rdev, mode);
1938 out:
1939         mutex_unlock(&rdev->mutex);
1940         return ret;
1941 }
1942 EXPORT_SYMBOL_GPL(regulator_set_mode);
1943
1944 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1945 {
1946         int ret;
1947
1948         mutex_lock(&rdev->mutex);
1949
1950         /* sanity check */
1951         if (!rdev->desc->ops->get_mode) {
1952                 ret = -EINVAL;
1953                 goto out;
1954         }
1955
1956         ret = rdev->desc->ops->get_mode(rdev);
1957 out:
1958         mutex_unlock(&rdev->mutex);
1959         return ret;
1960 }
1961
1962 /**
1963  * regulator_get_mode - get regulator operating mode
1964  * @regulator: regulator source
1965  *
1966  * Get the current regulator operating mode.
1967  */
1968 unsigned int regulator_get_mode(struct regulator *regulator)
1969 {
1970         return _regulator_get_mode(regulator->rdev);
1971 }
1972 EXPORT_SYMBOL_GPL(regulator_get_mode);
1973
1974 /**
1975  * regulator_set_optimum_mode - set regulator optimum operating mode
1976  * @regulator: regulator source
1977  * @uA_load: load current
1978  *
1979  * Notifies the regulator core of a new device load. This is then used by
1980  * DRMS (if enabled by constraints) to set the most efficient regulator
1981  * operating mode for the new regulator loading.
1982  *
1983  * Consumer devices notify their supply regulator of the maximum power
1984  * they will require (can be taken from device datasheet in the power
1985  * consumption tables) when they change operational status and hence power
1986  * state. Examples of operational state changes that can affect power
1987  * consumption are :-
1988  *
1989  *    o Device is opened / closed.
1990  *    o Device I/O is about to begin or has just finished.
1991  *    o Device is idling in between work.
1992  *
1993  * This information is also exported via sysfs to userspace.
1994  *
1995  * DRMS will sum the total requested load on the regulator and change
1996  * to the most efficient operating mode if platform constraints allow.
1997  *
1998  * Returns the new regulator mode or error.
1999  */
2000 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2001 {
2002         struct regulator_dev *rdev = regulator->rdev;
2003         struct regulator *consumer;
2004         int ret, output_uV, input_uV, total_uA_load = 0;
2005         unsigned int mode;
2006
2007         mutex_lock(&rdev->mutex);
2008
2009         regulator->uA_load = uA_load;
2010         ret = regulator_check_drms(rdev);
2011         if (ret < 0)
2012                 goto out;
2013         ret = -EINVAL;
2014
2015         /* sanity check */
2016         if (!rdev->desc->ops->get_optimum_mode)
2017                 goto out;
2018
2019         /* get output voltage */
2020         output_uV = _regulator_get_voltage(rdev);
2021         if (output_uV <= 0) {
2022                 rdev_err(rdev, "invalid output voltage found\n");
2023                 goto out;
2024         }
2025
2026         /* get input voltage */
2027         input_uV = 0;
2028         if (rdev->supply)
2029                 input_uV = _regulator_get_voltage(rdev->supply);
2030         if (input_uV <= 0)
2031                 input_uV = rdev->constraints->input_uV;
2032         if (input_uV <= 0) {
2033                 rdev_err(rdev, "invalid input voltage found\n");
2034                 goto out;
2035         }
2036
2037         /* calc total requested load for this regulator */
2038         list_for_each_entry(consumer, &rdev->consumer_list, list)
2039                 total_uA_load += consumer->uA_load;
2040
2041         mode = rdev->desc->ops->get_optimum_mode(rdev,
2042                                                  input_uV, output_uV,
2043                                                  total_uA_load);
2044         ret = regulator_check_mode(rdev, mode);
2045         if (ret < 0) {
2046                 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2047                          total_uA_load, input_uV, output_uV);
2048                 goto out;
2049         }
2050
2051         ret = rdev->desc->ops->set_mode(rdev, mode);
2052         if (ret < 0) {
2053                 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2054                 goto out;
2055         }
2056         ret = mode;
2057 out:
2058         mutex_unlock(&rdev->mutex);
2059         return ret;
2060 }
2061 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2062
2063 /**
2064  * regulator_register_notifier - register regulator event notifier
2065  * @regulator: regulator source
2066  * @nb: notifier block
2067  *
2068  * Register notifier block to receive regulator events.
2069  */
2070 int regulator_register_notifier(struct regulator *regulator,
2071                               struct notifier_block *nb)
2072 {
2073         return blocking_notifier_chain_register(&regulator->rdev->notifier,
2074                                                 nb);
2075 }
2076 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2077
2078 /**
2079  * regulator_unregister_notifier - unregister regulator event notifier
2080  * @regulator: regulator source
2081  * @nb: notifier block
2082  *
2083  * Unregister regulator event notifier block.
2084  */
2085 int regulator_unregister_notifier(struct regulator *regulator,
2086                                 struct notifier_block *nb)
2087 {
2088         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2089                                                   nb);
2090 }
2091 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2092
2093 /* notify regulator consumers and downstream regulator consumers.
2094  * Note mutex must be held by caller.
2095  */
2096 static void _notifier_call_chain(struct regulator_dev *rdev,
2097                                   unsigned long event, void *data)
2098 {
2099         struct regulator_dev *_rdev;
2100
2101         /* call rdev chain first */
2102         blocking_notifier_call_chain(&rdev->notifier, event, NULL);
2103
2104         /* now notify regulator we supply */
2105         list_for_each_entry(_rdev, &rdev->supply_list, slist) {
2106                 mutex_lock(&_rdev->mutex);
2107                 _notifier_call_chain(_rdev, event, data);
2108                 mutex_unlock(&_rdev->mutex);
2109         }
2110 }
2111
2112 /**
2113  * regulator_bulk_get - get multiple regulator consumers
2114  *
2115  * @dev:           Device to supply
2116  * @num_consumers: Number of consumers to register
2117  * @consumers:     Configuration of consumers; clients are stored here.
2118  *
2119  * @return 0 on success, an errno on failure.
2120  *
2121  * This helper function allows drivers to get several regulator
2122  * consumers in one operation.  If any of the regulators cannot be
2123  * acquired then any regulators that were allocated will be freed
2124  * before returning to the caller.
2125  */
2126 int regulator_bulk_get(struct device *dev, int num_consumers,
2127                        struct regulator_bulk_data *consumers)
2128 {
2129         int i;
2130         int ret;
2131
2132         for (i = 0; i < num_consumers; i++)
2133                 consumers[i].consumer = NULL;
2134
2135         for (i = 0; i < num_consumers; i++) {
2136                 consumers[i].consumer = regulator_get(dev,
2137                                                       consumers[i].supply);
2138                 if (IS_ERR(consumers[i].consumer)) {
2139                         ret = PTR_ERR(consumers[i].consumer);
2140                         dev_err(dev, "Failed to get supply '%s': %d\n",
2141                                 consumers[i].supply, ret);
2142                         consumers[i].consumer = NULL;
2143                         goto err;
2144                 }
2145         }
2146
2147         return 0;
2148
2149 err:
2150         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2151                 regulator_put(consumers[i].consumer);
2152
2153         return ret;
2154 }
2155 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2156
2157 /**
2158  * regulator_bulk_enable - enable multiple regulator consumers
2159  *
2160  * @num_consumers: Number of consumers
2161  * @consumers:     Consumer data; clients are stored here.
2162  * @return         0 on success, an errno on failure
2163  *
2164  * This convenience API allows consumers to enable multiple regulator
2165  * clients in a single API call.  If any consumers cannot be enabled
2166  * then any others that were enabled will be disabled again prior to
2167  * return.
2168  */
2169 int regulator_bulk_enable(int num_consumers,
2170                           struct regulator_bulk_data *consumers)
2171 {
2172         int i;
2173         int ret;
2174
2175         for (i = 0; i < num_consumers; i++) {
2176                 ret = regulator_enable(consumers[i].consumer);
2177                 if (ret != 0)
2178                         goto err;
2179         }
2180
2181         return 0;
2182
2183 err:
2184         pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2185         for (--i; i >= 0; --i)
2186                 regulator_disable(consumers[i].consumer);
2187
2188         return ret;
2189 }
2190 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2191
2192 /**
2193  * regulator_bulk_disable - disable multiple regulator consumers
2194  *
2195  * @num_consumers: Number of consumers
2196  * @consumers:     Consumer data; clients are stored here.
2197  * @return         0 on success, an errno on failure
2198  *
2199  * This convenience API allows consumers to disable multiple regulator
2200  * clients in a single API call.  If any consumers cannot be enabled
2201  * then any others that were disabled will be disabled again prior to
2202  * return.
2203  */
2204 int regulator_bulk_disable(int num_consumers,
2205                            struct regulator_bulk_data *consumers)
2206 {
2207         int i;
2208         int ret;
2209
2210         for (i = 0; i < num_consumers; i++) {
2211                 ret = regulator_disable(consumers[i].consumer);
2212                 if (ret != 0)
2213                         goto err;
2214         }
2215
2216         return 0;
2217
2218 err:
2219         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
2220         for (--i; i >= 0; --i)
2221                 regulator_enable(consumers[i].consumer);
2222
2223         return ret;
2224 }
2225 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2226
2227 /**
2228  * regulator_bulk_free - free multiple regulator consumers
2229  *
2230  * @num_consumers: Number of consumers
2231  * @consumers:     Consumer data; clients are stored here.
2232  *
2233  * This convenience API allows consumers to free multiple regulator
2234  * clients in a single API call.
2235  */
2236 void regulator_bulk_free(int num_consumers,
2237                          struct regulator_bulk_data *consumers)
2238 {
2239         int i;
2240
2241         for (i = 0; i < num_consumers; i++) {
2242                 regulator_put(consumers[i].consumer);
2243                 consumers[i].consumer = NULL;
2244         }
2245 }
2246 EXPORT_SYMBOL_GPL(regulator_bulk_free);
2247
2248 /**
2249  * regulator_notifier_call_chain - call regulator event notifier
2250  * @rdev: regulator source
2251  * @event: notifier block
2252  * @data: callback-specific data.
2253  *
2254  * Called by regulator drivers to notify clients a regulator event has
2255  * occurred. We also notify regulator clients downstream.
2256  * Note lock must be held by caller.
2257  */
2258 int regulator_notifier_call_chain(struct regulator_dev *rdev,
2259                                   unsigned long event, void *data)
2260 {
2261         _notifier_call_chain(rdev, event, data);
2262         return NOTIFY_DONE;
2263
2264 }
2265 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2266
2267 /**
2268  * regulator_mode_to_status - convert a regulator mode into a status
2269  *
2270  * @mode: Mode to convert
2271  *
2272  * Convert a regulator mode into a status.
2273  */
2274 int regulator_mode_to_status(unsigned int mode)
2275 {
2276         switch (mode) {
2277         case REGULATOR_MODE_FAST:
2278                 return REGULATOR_STATUS_FAST;
2279         case REGULATOR_MODE_NORMAL:
2280                 return REGULATOR_STATUS_NORMAL;
2281         case REGULATOR_MODE_IDLE:
2282                 return REGULATOR_STATUS_IDLE;
2283         case REGULATOR_STATUS_STANDBY:
2284                 return REGULATOR_STATUS_STANDBY;
2285         default:
2286                 return 0;
2287         }
2288 }
2289 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2290
2291 /*
2292  * To avoid cluttering sysfs (and memory) with useless state, only
2293  * create attributes that can be meaningfully displayed.
2294  */
2295 static int add_regulator_attributes(struct regulator_dev *rdev)
2296 {
2297         struct device           *dev = &rdev->dev;
2298         struct regulator_ops    *ops = rdev->desc->ops;
2299         int                     status = 0;
2300
2301         /* some attributes need specific methods to be displayed */
2302         if (ops->get_voltage || ops->get_voltage_sel) {
2303                 status = device_create_file(dev, &dev_attr_microvolts);
2304                 if (status < 0)
2305                         return status;
2306         }
2307         if (ops->get_current_limit) {
2308                 status = device_create_file(dev, &dev_attr_microamps);
2309                 if (status < 0)
2310                         return status;
2311         }
2312         if (ops->get_mode) {
2313                 status = device_create_file(dev, &dev_attr_opmode);
2314                 if (status < 0)
2315                         return status;
2316         }
2317         if (ops->is_enabled) {
2318                 status = device_create_file(dev, &dev_attr_state);
2319                 if (status < 0)
2320                         return status;
2321         }
2322         if (ops->get_status) {
2323                 status = device_create_file(dev, &dev_attr_status);
2324                 if (status < 0)
2325                         return status;
2326         }
2327
2328         /* some attributes are type-specific */
2329         if (rdev->desc->type == REGULATOR_CURRENT) {
2330                 status = device_create_file(dev, &dev_attr_requested_microamps);
2331                 if (status < 0)
2332                         return status;
2333         }
2334
2335         /* all the other attributes exist to support constraints;
2336          * don't show them if there are no constraints, or if the
2337          * relevant supporting methods are missing.
2338          */
2339         if (!rdev->constraints)
2340                 return status;
2341
2342         /* constraints need specific supporting methods */
2343         if (ops->set_voltage || ops->set_voltage_sel) {
2344                 status = device_create_file(dev, &dev_attr_min_microvolts);
2345                 if (status < 0)
2346                         return status;
2347                 status = device_create_file(dev, &dev_attr_max_microvolts);
2348                 if (status < 0)
2349                         return status;
2350         }
2351         if (ops->set_current_limit) {
2352                 status = device_create_file(dev, &dev_attr_min_microamps);
2353                 if (status < 0)
2354                         return status;
2355                 status = device_create_file(dev, &dev_attr_max_microamps);
2356                 if (status < 0)
2357                         return status;
2358         }
2359
2360         /* suspend mode constraints need multiple supporting methods */
2361         if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2362                 return status;
2363
2364         status = device_create_file(dev, &dev_attr_suspend_standby_state);
2365         if (status < 0)
2366                 return status;
2367         status = device_create_file(dev, &dev_attr_suspend_mem_state);
2368         if (status < 0)
2369                 return status;
2370         status = device_create_file(dev, &dev_attr_suspend_disk_state);
2371         if (status < 0)
2372                 return status;
2373
2374         if (ops->set_suspend_voltage) {
2375                 status = device_create_file(dev,
2376                                 &dev_attr_suspend_standby_microvolts);
2377                 if (status < 0)
2378                         return status;
2379                 status = device_create_file(dev,
2380                                 &dev_attr_suspend_mem_microvolts);
2381                 if (status < 0)
2382                         return status;
2383                 status = device_create_file(dev,
2384                                 &dev_attr_suspend_disk_microvolts);
2385                 if (status < 0)
2386                         return status;
2387         }
2388
2389         if (ops->set_suspend_mode) {
2390                 status = device_create_file(dev,
2391                                 &dev_attr_suspend_standby_mode);
2392                 if (status < 0)
2393                         return status;
2394                 status = device_create_file(dev,
2395                                 &dev_attr_suspend_mem_mode);
2396                 if (status < 0)
2397                         return status;
2398                 status = device_create_file(dev,
2399                                 &dev_attr_suspend_disk_mode);
2400                 if (status < 0)
2401                         return status;
2402         }
2403
2404         return status;
2405 }
2406
2407 /**
2408  * regulator_register - register regulator
2409  * @regulator_desc: regulator to register
2410  * @dev: struct device for the regulator
2411  * @init_data: platform provided init data, passed through by driver
2412  * @driver_data: private regulator data
2413  *
2414  * Called by regulator drivers to register a regulator.
2415  * Returns 0 on success.
2416  */
2417 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2418         struct device *dev, const struct regulator_init_data *init_data,
2419         void *driver_data)
2420 {
2421         static atomic_t regulator_no = ATOMIC_INIT(0);
2422         struct regulator_dev *rdev;
2423         int ret, i;
2424
2425         if (regulator_desc == NULL)
2426                 return ERR_PTR(-EINVAL);
2427
2428         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2429                 return ERR_PTR(-EINVAL);
2430
2431         if (regulator_desc->type != REGULATOR_VOLTAGE &&
2432             regulator_desc->type != REGULATOR_CURRENT)
2433                 return ERR_PTR(-EINVAL);
2434
2435         if (!init_data)
2436                 return ERR_PTR(-EINVAL);
2437
2438         /* Only one of each should be implemented */
2439         WARN_ON(regulator_desc->ops->get_voltage &&
2440                 regulator_desc->ops->get_voltage_sel);
2441         WARN_ON(regulator_desc->ops->set_voltage &&
2442                 regulator_desc->ops->set_voltage_sel);
2443
2444         /* If we're using selectors we must implement list_voltage. */
2445         if (regulator_desc->ops->get_voltage_sel &&
2446             !regulator_desc->ops->list_voltage) {
2447                 return ERR_PTR(-EINVAL);
2448         }
2449         if (regulator_desc->ops->set_voltage_sel &&
2450             !regulator_desc->ops->list_voltage) {
2451                 return ERR_PTR(-EINVAL);
2452         }
2453
2454         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2455         if (rdev == NULL)
2456                 return ERR_PTR(-ENOMEM);
2457
2458         mutex_lock(&regulator_list_mutex);
2459
2460         mutex_init(&rdev->mutex);
2461         rdev->reg_data = driver_data;
2462         rdev->owner = regulator_desc->owner;
2463         rdev->desc = regulator_desc;
2464         INIT_LIST_HEAD(&rdev->consumer_list);
2465         INIT_LIST_HEAD(&rdev->supply_list);
2466         INIT_LIST_HEAD(&rdev->list);
2467         INIT_LIST_HEAD(&rdev->slist);
2468         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2469
2470         /* preform any regulator specific init */
2471         if (init_data->regulator_init) {
2472                 ret = init_data->regulator_init(rdev->reg_data);
2473                 if (ret < 0)
2474                         goto clean;
2475         }
2476
2477         /* register with sysfs */
2478         rdev->dev.class = &regulator_class;
2479         rdev->dev.parent = dev;
2480         dev_set_name(&rdev->dev, "regulator.%d",
2481                      atomic_inc_return(&regulator_no) - 1);
2482         ret = device_register(&rdev->dev);
2483         if (ret != 0) {
2484                 put_device(&rdev->dev);
2485                 goto clean;
2486         }
2487
2488         dev_set_drvdata(&rdev->dev, rdev);
2489
2490         /* set regulator constraints */
2491         ret = set_machine_constraints(rdev, &init_data->constraints);
2492         if (ret < 0)
2493                 goto scrub;
2494
2495         /* add attributes supported by this regulator */
2496         ret = add_regulator_attributes(rdev);
2497         if (ret < 0)
2498                 goto scrub;
2499
2500         /* set supply regulator if it exists */
2501         if (init_data->supply_regulator && init_data->supply_regulator_dev) {
2502                 dev_err(dev,
2503                         "Supply regulator specified by both name and dev\n");
2504                 ret = -EINVAL;
2505                 goto scrub;
2506         }
2507
2508         if (init_data->supply_regulator) {
2509                 struct regulator_dev *r;
2510                 int found = 0;
2511
2512                 list_for_each_entry(r, &regulator_list, list) {
2513                         if (strcmp(rdev_get_name(r),
2514                                    init_data->supply_regulator) == 0) {
2515                                 found = 1;
2516                                 break;
2517                         }
2518                 }
2519
2520                 if (!found) {
2521                         dev_err(dev, "Failed to find supply %s\n",
2522                                 init_data->supply_regulator);
2523                         ret = -ENODEV;
2524                         goto scrub;
2525                 }
2526
2527                 ret = set_supply(rdev, r);
2528                 if (ret < 0)
2529                         goto scrub;
2530         }
2531
2532         if (init_data->supply_regulator_dev) {
2533                 dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n");
2534                 ret = set_supply(rdev,
2535                         dev_get_drvdata(init_data->supply_regulator_dev));
2536                 if (ret < 0)
2537                         goto scrub;
2538         }
2539
2540         /* add consumers devices */
2541         for (i = 0; i < init_data->num_consumer_supplies; i++) {
2542                 ret = set_consumer_device_supply(rdev,
2543                         init_data->consumer_supplies[i].dev,
2544                         init_data->consumer_supplies[i].dev_name,
2545                         init_data->consumer_supplies[i].supply);
2546                 if (ret < 0)
2547                         goto unset_supplies;
2548         }
2549
2550         list_add(&rdev->list, &regulator_list);
2551 out:
2552         mutex_unlock(&regulator_list_mutex);
2553         return rdev;
2554
2555 unset_supplies:
2556         unset_regulator_supplies(rdev);
2557
2558 scrub:
2559         device_unregister(&rdev->dev);
2560         /* device core frees rdev */
2561         rdev = ERR_PTR(ret);
2562         goto out;
2563
2564 clean:
2565         kfree(rdev);
2566         rdev = ERR_PTR(ret);
2567         goto out;
2568 }
2569 EXPORT_SYMBOL_GPL(regulator_register);
2570
2571 /**
2572  * regulator_unregister - unregister regulator
2573  * @rdev: regulator to unregister
2574  *
2575  * Called by regulator drivers to unregister a regulator.
2576  */
2577 void regulator_unregister(struct regulator_dev *rdev)
2578 {
2579         if (rdev == NULL)
2580                 return;
2581
2582         mutex_lock(&regulator_list_mutex);
2583         WARN_ON(rdev->open_count);
2584         unset_regulator_supplies(rdev);
2585         list_del(&rdev->list);
2586         if (rdev->supply)
2587                 sysfs_remove_link(&rdev->dev.kobj, "supply");
2588         device_unregister(&rdev->dev);
2589         kfree(rdev->constraints);
2590         mutex_unlock(&regulator_list_mutex);
2591 }
2592 EXPORT_SYMBOL_GPL(regulator_unregister);
2593
2594 /**
2595  * regulator_suspend_prepare - prepare regulators for system wide suspend
2596  * @state: system suspend state
2597  *
2598  * Configure each regulator with it's suspend operating parameters for state.
2599  * This will usually be called by machine suspend code prior to supending.
2600  */
2601 int regulator_suspend_prepare(suspend_state_t state)
2602 {
2603         struct regulator_dev *rdev;
2604         int ret = 0;
2605
2606         /* ON is handled by regulator active state */
2607         if (state == PM_SUSPEND_ON)
2608                 return -EINVAL;
2609
2610         mutex_lock(&regulator_list_mutex);
2611         list_for_each_entry(rdev, &regulator_list, list) {
2612
2613                 mutex_lock(&rdev->mutex);
2614                 ret = suspend_prepare(rdev, state);
2615                 mutex_unlock(&rdev->mutex);
2616
2617                 if (ret < 0) {
2618                         rdev_err(rdev, "failed to prepare\n");
2619                         goto out;
2620                 }
2621         }
2622 out:
2623         mutex_unlock(&regulator_list_mutex);
2624         return ret;
2625 }
2626 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2627
2628 /**
2629  * regulator_has_full_constraints - the system has fully specified constraints
2630  *
2631  * Calling this function will cause the regulator API to disable all
2632  * regulators which have a zero use count and don't have an always_on
2633  * constraint in a late_initcall.
2634  *
2635  * The intention is that this will become the default behaviour in a
2636  * future kernel release so users are encouraged to use this facility
2637  * now.
2638  */
2639 void regulator_has_full_constraints(void)
2640 {
2641         has_full_constraints = 1;
2642 }
2643 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
2644
2645 /**
2646  * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
2647  *
2648  * Calling this function will cause the regulator API to provide a
2649  * dummy regulator to consumers if no physical regulator is found,
2650  * allowing most consumers to proceed as though a regulator were
2651  * configured.  This allows systems such as those with software
2652  * controllable regulators for the CPU core only to be brought up more
2653  * readily.
2654  */
2655 void regulator_use_dummy_regulator(void)
2656 {
2657         board_wants_dummy_regulator = true;
2658 }
2659 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
2660
2661 /**
2662  * rdev_get_drvdata - get rdev regulator driver data
2663  * @rdev: regulator
2664  *
2665  * Get rdev regulator driver private data. This call can be used in the
2666  * regulator driver context.
2667  */
2668 void *rdev_get_drvdata(struct regulator_dev *rdev)
2669 {
2670         return rdev->reg_data;
2671 }
2672 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2673
2674 /**
2675  * regulator_get_drvdata - get regulator driver data
2676  * @regulator: regulator
2677  *
2678  * Get regulator driver private data. This call can be used in the consumer
2679  * driver context when non API regulator specific functions need to be called.
2680  */
2681 void *regulator_get_drvdata(struct regulator *regulator)
2682 {
2683         return regulator->rdev->reg_data;
2684 }
2685 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2686
2687 /**
2688  * regulator_set_drvdata - set regulator driver data
2689  * @regulator: regulator
2690  * @data: data
2691  */
2692 void regulator_set_drvdata(struct regulator *regulator, void *data)
2693 {
2694         regulator->rdev->reg_data = data;
2695 }
2696 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2697
2698 /**
2699  * regulator_get_id - get regulator ID
2700  * @rdev: regulator
2701  */
2702 int rdev_get_id(struct regulator_dev *rdev)
2703 {
2704         return rdev->desc->id;
2705 }
2706 EXPORT_SYMBOL_GPL(rdev_get_id);
2707
2708 struct device *rdev_get_dev(struct regulator_dev *rdev)
2709 {
2710         return &rdev->dev;
2711 }
2712 EXPORT_SYMBOL_GPL(rdev_get_dev);
2713
2714 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2715 {
2716         return reg_init_data->driver_data;
2717 }
2718 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2719
2720 static int __init regulator_init(void)
2721 {
2722         int ret;
2723
2724         ret = class_register(&regulator_class);
2725
2726         regulator_dummy_init();
2727
2728         return ret;
2729 }
2730
2731 /* init early to allow our consumers to complete system booting */
2732 core_initcall(regulator_init);
2733
2734 static int __init regulator_init_complete(void)
2735 {
2736         struct regulator_dev *rdev;
2737         struct regulator_ops *ops;
2738         struct regulation_constraints *c;
2739         int enabled, ret;
2740
2741         mutex_lock(&regulator_list_mutex);
2742
2743         /* If we have a full configuration then disable any regulators
2744          * which are not in use or always_on.  This will become the
2745          * default behaviour in the future.
2746          */
2747         list_for_each_entry(rdev, &regulator_list, list) {
2748                 ops = rdev->desc->ops;
2749                 c = rdev->constraints;
2750
2751                 if (!ops->disable || (c && c->always_on))
2752                         continue;
2753
2754                 mutex_lock(&rdev->mutex);
2755
2756                 if (rdev->use_count)
2757                         goto unlock;
2758
2759                 /* If we can't read the status assume it's on. */
2760                 if (ops->is_enabled)
2761                         enabled = ops->is_enabled(rdev);
2762                 else
2763                         enabled = 1;
2764
2765                 if (!enabled)
2766                         goto unlock;
2767
2768                 if (has_full_constraints) {
2769                         /* We log since this may kill the system if it
2770                          * goes wrong. */
2771                         rdev_info(rdev, "disabling\n");
2772                         ret = ops->disable(rdev);
2773                         if (ret != 0) {
2774                                 rdev_err(rdev, "couldn't disable: %d\n", ret);
2775                         }
2776                 } else {
2777                         /* The intention is that in future we will
2778                          * assume that full constraints are provided
2779                          * so warn even if we aren't going to do
2780                          * anything here.
2781                          */
2782                         rdev_warn(rdev, "incomplete constraints, leaving on\n");
2783                 }
2784
2785 unlock:
2786                 mutex_unlock(&rdev->mutex);
2787         }
2788
2789         mutex_unlock(&regulator_list_mutex);
2790
2791         return 0;
2792 }
2793 late_initcall(regulator_init_complete);