Pileus Git - ~andy/linux/blob - 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 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/device.h>
  20 #include <linux/slab.h>
  21 #include <linux/async.h>
  22 #include <linux/err.h>
  23 #include <linux/mutex.h>
  24 #include <linux/suspend.h>
  25 #include <linux/delay.h>
  26 #include <linux/of.h>
  27 #include <linux/regmap.h>
  28 #include <linux/regulator/of_regulator.h>
  29 #include <linux/regulator/consumer.h>
  30 #include <linux/regulator/driver.h>
  31 #include <linux/regulator/machine.h>
  32 #include <linux/module.h>
  33
  34 #define CREATE_TRACE_POINTS
  35 #include <trace/events/regulator.h>
  36
  37 #include "dummy.h"
  38
  39 #define rdev_crit(rdev, fmt, ...)                                       \
  40         pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  41 #define rdev_err(rdev, fmt, ...)                                        \
  42         pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  43 #define rdev_warn(rdev, fmt, ...)                                       \
  44         pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  45 #define rdev_info(rdev, fmt, ...)                                       \
  46         pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  47 #define rdev_dbg(rdev, fmt, ...)                                        \
  48         pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  49
  50 static DEFINE_MUTEX(regulator_list_mutex);
  51 static LIST_HEAD(regulator_list);
  52 static LIST_HEAD(regulator_map_list);
  53 static bool has_full_constraints;
  54 static bool board_wants_dummy_regulator;
  55
  56 static struct dentry *debugfs_root;
  57
  58 /*
  59  * struct regulator_map
  60  *
  61  * Used to provide symbolic supply names to devices.
  62  */
  63 struct regulator_map {
  64         struct list_head list;
  65         const char *dev_name;   /* The dev_name() for the consumer */
  66         const char *supply;
  67         struct regulator_dev *regulator;
  68 };
  69
  70 /*
  71  * struct regulator
  72  *
  73  * One for each consumer device.
  74  */
  75 struct regulator {
  76         struct device *dev;
  77         struct list_head list;
  78         unsigned int always_on:1;
  79         int uA_load;
  80         int min_uV;
  81         int max_uV;
  82         char *supply_name;
  83         struct device_attribute dev_attr;
  84         struct regulator_dev *rdev;
  85         struct dentry *debugfs;
  86 };
  87
  88 static int _regulator_is_enabled(struct regulator_dev *rdev);
  89 static int _regulator_disable(struct regulator_dev *rdev);
  90 static int _regulator_get_voltage(struct regulator_dev *rdev);
  91 static int _regulator_get_current_limit(struct regulator_dev *rdev);
  92 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
  93 static void _notifier_call_chain(struct regulator_dev *rdev,
  94                                   unsigned long event, void *data);
  95 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
  96                                      int min_uV, int max_uV);
  97 static struct regulator *create_regulator(struct regulator_dev *rdev,
  98                                           struct device *dev,
  99                                           const char *supply_name);
 100
 101 static const char *rdev_get_name(struct regulator_dev *rdev)
 102 {
 103         if (rdev->constraints && rdev->constraints->name)
 104                 return rdev->constraints->name;
 105         else if (rdev->desc->name)
 106                 return rdev->desc->name;
 107         else
 108                 return "";
 109 }
 110
 111 /* gets the regulator for a given consumer device */
 112 static struct regulator *get_device_regulator(struct device *dev)
 113 {
 114         struct regulator *regulator = NULL;
 115         struct regulator_dev *rdev;
 116
 117         mutex_lock(&regulator_list_mutex);
 118         list_for_each_entry(rdev, &regulator_list, list) {
 119                 mutex_lock(&rdev->mutex);
 120                 list_for_each_entry(regulator, &rdev->consumer_list, list) {
 121                         if (regulator->dev == dev) {
 122                                 mutex_unlock(&rdev->mutex);
 123                                 mutex_unlock(&regulator_list_mutex);
 124                                 return regulator;
 125                         }
 126                 }
 127                 mutex_unlock(&rdev->mutex);
 128         }
 129         mutex_unlock(&regulator_list_mutex);
 130         return NULL;
 131 }
 132
 133 /**
 134  * of_get_regulator - get a regulator device node based on supply name
 135  * @dev: Device pointer for the consumer (of regulator) device
 136  * @supply: regulator supply name
 137  *
 138  * Extract the regulator device node corresponding to the supply name.
 139  * retruns the device node corresponding to the regulator if found, else
 140  * returns NULL.
 141  */
 142 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 143 {
 144         struct device_node *regnode = NULL;
 145         char prop_name[32]; /* 32 is max size of property name */
 146
 147         dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
 148
 149         snprintf(prop_name, 32, "%s-supply", supply);
 150         regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 151
 152         if (!regnode) {
 153                 dev_dbg(dev, "Looking up %s property in node %s failed",
 154                                 prop_name, dev->of_node->full_name);
 155                 return NULL;
 156         }
 157         return regnode;
 158 }
 159
 160 static int _regulator_can_change_status(struct regulator_dev *rdev)
 161 {
 162         if (!rdev->constraints)
 163                 return 0;
 164
 165         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
 166                 return 1;
 167         else
 168                 return 0;
 169 }
 170
 171 /* Platform voltage constraint check */
 172 static int regulator_check_voltage(struct regulator_dev *rdev,
 173                                    int *min_uV, int *max_uV)
 174 {
 175         BUG_ON(*min_uV > *max_uV);
 176
 177         if (!rdev->constraints) {
 178                 rdev_err(rdev, "no constraints\n");
 179                 return -ENODEV;
 180         }
 181         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 182                 rdev_err(rdev, "operation not allowed\n");
 183                 return -EPERM;
 184         }
 185
 186         if (*max_uV > rdev->constraints->max_uV)
 187                 *max_uV = rdev->constraints->max_uV;
 188         if (*min_uV < rdev->constraints->min_uV)
 189                 *min_uV = rdev->constraints->min_uV;
 190
 191         if (*min_uV > *max_uV) {
 192                 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
 193                          *min_uV, *max_uV);
 194                 return -EINVAL;
 195         }
 196
 197         return 0;
 198 }
 199
 200 /* Make sure we select a voltage that suits the needs of all
 201  * regulator consumers
 202  */
 203 static int regulator_check_consumers(struct regulator_dev *rdev,
 204                                      int *min_uV, int *max_uV)
 205 {
 206         struct regulator *regulator;
 207
 208         list_for_each_entry(regulator, &rdev->consumer_list, list) {
 209                 /*
 210                  * Assume consumers that didn't say anything are OK
 211                  * with anything in the constraint range.
 212                  */
 213                 if (!regulator->min_uV && !regulator->max_uV)
 214                         continue;
 215
 216                 if (*max_uV > regulator->max_uV)
 217                         *max_uV = regulator->max_uV;
 218                 if (*min_uV < regulator->min_uV)
 219                         *min_uV = regulator->min_uV;
 220         }
 221
 222         if (*min_uV > *max_uV)
 223                 return -EINVAL;
 224
 225         return 0;
 226 }
 227
 228 /* current constraint check */
 229 static int regulator_check_current_limit(struct regulator_dev *rdev,
 230                                         int *min_uA, int *max_uA)
 231 {
 232         BUG_ON(*min_uA > *max_uA);
 233
 234         if (!rdev->constraints) {
 235                 rdev_err(rdev, "no constraints\n");
 236                 return -ENODEV;
 237         }
 238         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 239                 rdev_err(rdev, "operation not allowed\n");
 240                 return -EPERM;
 241         }
 242
 243         if (*max_uA > rdev->constraints->max_uA)
 244                 *max_uA = rdev->constraints->max_uA;
 245         if (*min_uA < rdev->constraints->min_uA)
 246                 *min_uA = rdev->constraints->min_uA;
 247
 248         if (*min_uA > *max_uA) {
 249                 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
 250                          *min_uA, *max_uA);
 251                 return -EINVAL;
 252         }
 253
 254         return 0;
 255 }
 256
 257 /* operating mode constraint check */
 258 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
 259 {
 260         switch (*mode) {
 261         case REGULATOR_MODE_FAST:
 262         case REGULATOR_MODE_NORMAL:
 263         case REGULATOR_MODE_IDLE:
 264         case REGULATOR_MODE_STANDBY:
 265                 break;
 266         default:
 267                 rdev_err(rdev, "invalid mode %x specified\n", *mode);
 268                 return -EINVAL;
 269         }
 270
 271         if (!rdev->constraints) {
 272                 rdev_err(rdev, "no constraints\n");
 273                 return -ENODEV;
 274         }
 275         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 276                 rdev_err(rdev, "operation not allowed\n");
 277                 return -EPERM;
 278         }
 279
 280         /* The modes are bitmasks, the most power hungry modes having
 281          * the lowest values. If the requested mode isn't supported
 282          * try higher modes. */
 283         while (*mode) {
 284                 if (rdev->constraints->valid_modes_mask & *mode)
 285                         return 0;
 286                 *mode /= 2;
 287         }
 288
 289         return -EINVAL;
 290 }
 291
 292 /* dynamic regulator mode switching constraint check */
 293 static int regulator_check_drms(struct regulator_dev *rdev)
 294 {
 295         if (!rdev->constraints) {
 296                 rdev_err(rdev, "no constraints\n");
 297                 return -ENODEV;
 298         }
 299         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 300                 rdev_err(rdev, "operation not allowed\n");
 301                 return -EPERM;
 302         }
 303         return 0;
 304 }
 305
 306 static ssize_t device_requested_uA_show(struct device *dev,
 307                              struct device_attribute *attr, char *buf)
 308 {
 309         struct regulator *regulator;
 310
 311         regulator = get_device_regulator(dev);
 312         if (regulator == NULL)
 313                 return 0;
 314
 315         return sprintf(buf, "%d\n", regulator->uA_load);
 316 }
 317
 318 static ssize_t regulator_uV_show(struct device *dev,
 319                                 struct device_attribute *attr, char *buf)
 320 {
 321         struct regulator_dev *rdev = dev_get_drvdata(dev);
 322         ssize_t ret;
 323
 324         mutex_lock(&rdev->mutex);
 325         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 326         mutex_unlock(&rdev->mutex);
 327
 328         return ret;
 329 }
 330 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 331
 332 static ssize_t regulator_uA_show(struct device *dev,
 333                                 struct device_attribute *attr, char *buf)
 334 {
 335         struct regulator_dev *rdev = dev_get_drvdata(dev);
 336
 337         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 338 }
 339 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 340
 341 static ssize_t regulator_name_show(struct device *dev,
 342                              struct device_attribute *attr, char *buf)
 343 {
 344         struct regulator_dev *rdev = dev_get_drvdata(dev);
 345
 346         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 347 }
 348
 349 static ssize_t regulator_print_opmode(char *buf, int mode)
 350 {
 351         switch (mode) {
 352         case REGULATOR_MODE_FAST:
 353                 return sprintf(buf, "fast\n");
 354         case REGULATOR_MODE_NORMAL:
 355                 return sprintf(buf, "normal\n");
 356         case REGULATOR_MODE_IDLE:
 357                 return sprintf(buf, "idle\n");
 358         case REGULATOR_MODE_STANDBY:
 359                 return sprintf(buf, "standby\n");
 360         }
 361         return sprintf(buf, "unknown\n");
 362 }
 363
 364 static ssize_t regulator_opmode_show(struct device *dev,
 365                                     struct device_attribute *attr, char *buf)
 366 {
 367         struct regulator_dev *rdev = dev_get_drvdata(dev);
 368
 369         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 370 }
 371 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 372
 373 static ssize_t regulator_print_state(char *buf, int state)
 374 {
 375         if (state > 0)
 376                 return sprintf(buf, "enabled\n");
 377         else if (state == 0)
 378                 return sprintf(buf, "disabled\n");
 379         else
 380                 return sprintf(buf, "unknown\n");
 381 }
 382
 383 static ssize_t regulator_state_show(struct device *dev,
 384                                    struct device_attribute *attr, char *buf)
 385 {
 386         struct regulator_dev *rdev = dev_get_drvdata(dev);
 387         ssize_t ret;
 388
 389         mutex_lock(&rdev->mutex);
 390         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 391         mutex_unlock(&rdev->mutex);
 392
 393         return ret;
 394 }
 395 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 396
 397 static ssize_t regulator_status_show(struct device *dev,
 398                                    struct device_attribute *attr, char *buf)
 399 {
 400         struct regulator_dev *rdev = dev_get_drvdata(dev);
 401         int status;
 402         char *label;
 403
 404         status = rdev->desc->ops->get_status(rdev);
 405         if (status < 0)
 406                 return status;
 407
 408         switch (status) {
 409         case REGULATOR_STATUS_OFF:
 410                 label = "off";
 411                 break;
 412         case REGULATOR_STATUS_ON:
 413                 label = "on";
 414                 break;
 415         case REGULATOR_STATUS_ERROR:
 416                 label = "error";
 417                 break;
 418         case REGULATOR_STATUS_FAST:
 419                 label = "fast";
 420                 break;
 421         case REGULATOR_STATUS_NORMAL:
 422                 label = "normal";
 423                 break;
 424         case REGULATOR_STATUS_IDLE:
 425                 label = "idle";
 426                 break;
 427         case REGULATOR_STATUS_STANDBY:
 428                 label = "standby";
 429                 break;
 430         default:
 431                 return -ERANGE;
 432         }
 433
 434         return sprintf(buf, "%s\n", label);
 435 }
 436 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 437
 438 static ssize_t regulator_min_uA_show(struct device *dev,
 439                                     struct device_attribute *attr, char *buf)
 440 {
 441         struct regulator_dev *rdev = dev_get_drvdata(dev);
 442
 443         if (!rdev->constraints)
 444                 return sprintf(buf, "constraint not defined\n");
 445
 446         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 447 }
 448 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 449
 450 static ssize_t regulator_max_uA_show(struct device *dev,
 451                                     struct device_attribute *attr, char *buf)
 452 {
 453         struct regulator_dev *rdev = dev_get_drvdata(dev);
 454
 455         if (!rdev->constraints)
 456                 return sprintf(buf, "constraint not defined\n");
 457
 458         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 459 }
 460 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 461
 462 static ssize_t regulator_min_uV_show(struct device *dev,
 463                                     struct device_attribute *attr, char *buf)
 464 {
 465         struct regulator_dev *rdev = dev_get_drvdata(dev);
 466
 467         if (!rdev->constraints)
 468                 return sprintf(buf, "constraint not defined\n");
 469
 470         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 471 }
 472 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 473
 474 static ssize_t regulator_max_uV_show(struct device *dev,
 475                                     struct device_attribute *attr, char *buf)
 476 {
 477         struct regulator_dev *rdev = dev_get_drvdata(dev);
 478
 479         if (!rdev->constraints)
 480                 return sprintf(buf, "constraint not defined\n");
 481
 482         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 483 }
 484 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 485
 486 static ssize_t regulator_total_uA_show(struct device *dev,
 487                                       struct device_attribute *attr, char *buf)
 488 {
 489         struct regulator_dev *rdev = dev_get_drvdata(dev);
 490         struct regulator *regulator;
 491         int uA = 0;
 492
 493         mutex_lock(&rdev->mutex);
 494         list_for_each_entry(regulator, &rdev->consumer_list, list)
 495                 uA += regulator->uA_load;
 496         mutex_unlock(&rdev->mutex);
 497         return sprintf(buf, "%d\n", uA);
 498 }
 499 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 500
 501 static ssize_t regulator_num_users_show(struct device *dev,
 502                                       struct device_attribute *attr, char *buf)
 503 {
 504         struct regulator_dev *rdev = dev_get_drvdata(dev);
 505         return sprintf(buf, "%d\n", rdev->use_count);
 506 }
 507
 508 static ssize_t regulator_type_show(struct device *dev,
 509                                   struct device_attribute *attr, char *buf)
 510 {
 511         struct regulator_dev *rdev = dev_get_drvdata(dev);
 512
 513         switch (rdev->desc->type) {
 514         case REGULATOR_VOLTAGE:
 515                 return sprintf(buf, "voltage\n");
 516         case REGULATOR_CURRENT:
 517                 return sprintf(buf, "current\n");
 518         }
 519         return sprintf(buf, "unknown\n");
 520 }
 521
 522 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 523                                 struct device_attribute *attr, char *buf)
 524 {
 525         struct regulator_dev *rdev = dev_get_drvdata(dev);
 526
 527         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 528 }
 529 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 530                 regulator_suspend_mem_uV_show, NULL);
 531
 532 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 533                                 struct device_attribute *attr, char *buf)
 534 {
 535         struct regulator_dev *rdev = dev_get_drvdata(dev);
 536
 537         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 538 }
 539 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 540                 regulator_suspend_disk_uV_show, NULL);
 541
 542 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 543                                 struct device_attribute *attr, char *buf)
 544 {
 545         struct regulator_dev *rdev = dev_get_drvdata(dev);
 546
 547         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 548 }
 549 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 550                 regulator_suspend_standby_uV_show, NULL);
 551
 552 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 553                                 struct device_attribute *attr, char *buf)
 554 {
 555         struct regulator_dev *rdev = dev_get_drvdata(dev);
 556
 557         return regulator_print_opmode(buf,
 558                 rdev->constraints->state_mem.mode);
 559 }
 560 static DEVICE_ATTR(suspend_mem_mode, 0444,
 561                 regulator_suspend_mem_mode_show, NULL);
 562
 563 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 564                                 struct device_attribute *attr, char *buf)
 565 {
 566         struct regulator_dev *rdev = dev_get_drvdata(dev);
 567
 568         return regulator_print_opmode(buf,
 569                 rdev->constraints->state_disk.mode);
 570 }
 571 static DEVICE_ATTR(suspend_disk_mode, 0444,
 572                 regulator_suspend_disk_mode_show, NULL);
 573
 574 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 575                                 struct device_attribute *attr, char *buf)
 576 {
 577         struct regulator_dev *rdev = dev_get_drvdata(dev);
 578
 579         return regulator_print_opmode(buf,
 580                 rdev->constraints->state_standby.mode);
 581 }
 582 static DEVICE_ATTR(suspend_standby_mode, 0444,
 583                 regulator_suspend_standby_mode_show, NULL);
 584
 585 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 586                                    struct device_attribute *attr, char *buf)
 587 {
 588         struct regulator_dev *rdev = dev_get_drvdata(dev);
 589
 590         return regulator_print_state(buf,
 591                         rdev->constraints->state_mem.enabled);
 592 }
 593 static DEVICE_ATTR(suspend_mem_state, 0444,
 594                 regulator_suspend_mem_state_show, NULL);
 595
 596 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 597                                    struct device_attribute *attr, char *buf)
 598 {
 599         struct regulator_dev *rdev = dev_get_drvdata(dev);
 600
 601         return regulator_print_state(buf,
 602                         rdev->constraints->state_disk.enabled);
 603 }
 604 static DEVICE_ATTR(suspend_disk_state, 0444,
 605                 regulator_suspend_disk_state_show, NULL);
 606
 607 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 608                                    struct device_attribute *attr, char *buf)
 609 {
 610         struct regulator_dev *rdev = dev_get_drvdata(dev);
 611
 612         return regulator_print_state(buf,
 613                         rdev->constraints->state_standby.enabled);
 614 }
 615 static DEVICE_ATTR(suspend_standby_state, 0444,
 616                 regulator_suspend_standby_state_show, NULL);
 617
 618
 619 /*
 620  * These are the only attributes are present for all regulators.
 621  * Other attributes are a function of regulator functionality.
 622  */
 623 static struct device_attribute regulator_dev_attrs[] = {
 624         __ATTR(name, 0444, regulator_name_show, NULL),
 625         __ATTR(num_users, 0444, regulator_num_users_show, NULL),
 626         __ATTR(type, 0444, regulator_type_show, NULL),
 627         __ATTR_NULL,
 628 };
 629
 630 static void regulator_dev_release(struct device *dev)
 631 {
 632         struct regulator_dev *rdev = dev_get_drvdata(dev);
 633         kfree(rdev);
 634 }
 635
 636 static struct class regulator_class = {
 637         .name = "regulator",
 638         .dev_release = regulator_dev_release,
 639         .dev_attrs = regulator_dev_attrs,
 640 };
 641
 642 /* Calculate the new optimum regulator operating mode based on the new total
 643  * consumer load. All locks held by caller */
 644 static void drms_uA_update(struct regulator_dev *rdev)
 645 {
 646         struct regulator *sibling;
 647         int current_uA = 0, output_uV, input_uV, err;
 648         unsigned int mode;
 649
 650         err = regulator_check_drms(rdev);
 651         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 652             (!rdev->desc->ops->get_voltage &&
 653              !rdev->desc->ops->get_voltage_sel) ||
 654             !rdev->desc->ops->set_mode)
 655                 return;
 656
 657         /* get output voltage */
 658         output_uV = _regulator_get_voltage(rdev);
 659         if (output_uV <= 0)
 660                 return;
 661
 662         /* get input voltage */
 663         input_uV = 0;
 664         if (rdev->supply)
 665                 input_uV = regulator_get_voltage(rdev->supply);
 666         if (input_uV <= 0)
 667                 input_uV = rdev->constraints->input_uV;
 668         if (input_uV <= 0)
 669                 return;
 670
 671         /* calc total requested load */
 672         list_for_each_entry(sibling, &rdev->consumer_list, list)
 673                 current_uA += sibling->uA_load;
 674
 675         /* now get the optimum mode for our new total regulator load */
 676         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 677                                                   output_uV, current_uA);
 678
 679         /* check the new mode is allowed */
 680         err = regulator_mode_constrain(rdev, &mode);
 681         if (err == 0)
 682                 rdev->desc->ops->set_mode(rdev, mode);
 683 }
 684
 685 static int suspend_set_state(struct regulator_dev *rdev,
 686         struct regulator_state *rstate)
 687 {
 688         int ret = 0;
 689
 690         /* If we have no suspend mode configration don't set anything;
 691          * only warn if the driver implements set_suspend_voltage or
 692          * set_suspend_mode callback.
 693          */
 694         if (!rstate->enabled && !rstate->disabled) {
 695                 if (rdev->desc->ops->set_suspend_voltage ||
 696                     rdev->desc->ops->set_suspend_mode)
 697                         rdev_warn(rdev, "No configuration\n");
 698                 return 0;
 699         }
 700
 701         if (rstate->enabled && rstate->disabled) {
 702                 rdev_err(rdev, "invalid configuration\n");
 703                 return -EINVAL;
 704         }
 705
 706         if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
 707                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 708         else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
 709                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 710         else /* OK if set_suspend_enable or set_suspend_disable is NULL */
 711                 ret = 0;
 712
 713         if (ret < 0) {
 714                 rdev_err(rdev, "failed to enabled/disable\n");
 715                 return ret;
 716         }
 717
 718         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 719                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 720                 if (ret < 0) {
 721                         rdev_err(rdev, "failed to set voltage\n");
 722                         return ret;
 723                 }
 724         }
 725
 726         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 727                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 728                 if (ret < 0) {
 729                         rdev_err(rdev, "failed to set mode\n");
 730                         return ret;
 731                 }
 732         }
 733         return ret;
 734 }
 735
 736 /* locks held by caller */
 737 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 738 {
 739         if (!rdev->constraints)
 740                 return -EINVAL;
 741
 742         switch (state) {
 743         case PM_SUSPEND_STANDBY:
 744                 return suspend_set_state(rdev,
 745                         &rdev->constraints->state_standby);
 746         case PM_SUSPEND_MEM:
 747                 return suspend_set_state(rdev,
 748                         &rdev->constraints->state_mem);
 749         case PM_SUSPEND_MAX:
 750                 return suspend_set_state(rdev,
 751                         &rdev->constraints->state_disk);
 752         default:
 753                 return -EINVAL;
 754         }
 755 }
 756
 757 static void print_constraints(struct regulator_dev *rdev)
 758 {
 759         struct regulation_constraints *constraints = rdev->constraints;
 760         char buf[80] = "";
 761         int count = 0;
 762         int ret;
 763
 764         if (constraints->min_uV && constraints->max_uV) {
 765                 if (constraints->min_uV == constraints->max_uV)
 766                         count += sprintf(buf + count, "%d mV ",
 767                                          constraints->min_uV / 1000);
 768                 else
 769                         count += sprintf(buf + count, "%d <--> %d mV ",
 770                                          constraints->min_uV / 1000,
 771                                          constraints->max_uV / 1000);
 772         }
 773
 774         if (!constraints->min_uV ||
 775             constraints->min_uV != constraints->max_uV) {
 776                 ret = _regulator_get_voltage(rdev);
 777                 if (ret > 0)
 778                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
 779         }
 780
 781         if (constraints->uV_offset)
 782                 count += sprintf(buf, "%dmV offset ",
 783                                  constraints->uV_offset / 1000);
 784
 785         if (constraints->min_uA && constraints->max_uA) {
 786                 if (constraints->min_uA == constraints->max_uA)
 787                         count += sprintf(buf + count, "%d mA ",
 788                                          constraints->min_uA / 1000);
 789                 else
 790                         count += sprintf(buf + count, "%d <--> %d mA ",
 791                                          constraints->min_uA / 1000,
 792                                          constraints->max_uA / 1000);
 793         }
 794
 795         if (!constraints->min_uA ||
 796             constraints->min_uA != constraints->max_uA) {
 797                 ret = _regulator_get_current_limit(rdev);
 798                 if (ret > 0)
 799                         count += sprintf(buf + count, "at %d mA ", ret / 1000);
 800         }
 801
 802         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 803                 count += sprintf(buf + count, "fast ");
 804         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 805                 count += sprintf(buf + count, "normal ");
 806         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 807                 count += sprintf(buf + count, "idle ");
 808         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 809                 count += sprintf(buf + count, "standby");
 810
 811         rdev_info(rdev, "%s\n", buf);
 812
 813         if ((constraints->min_uV != constraints->max_uV) &&
 814             !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
 815                 rdev_warn(rdev,
 816                           "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
 817 }
 818
 819 static int machine_constraints_voltage(struct regulator_dev *rdev,
 820         struct regulation_constraints *constraints)
 821 {
 822         struct regulator_ops *ops = rdev->desc->ops;
 823         int ret;
 824
 825         /* do we need to apply the constraint voltage */
 826         if (rdev->constraints->apply_uV &&
 827             rdev->constraints->min_uV == rdev->constraints->max_uV) {
 828                 ret = _regulator_do_set_voltage(rdev,
 829                                                 rdev->constraints->min_uV,
 830                                                 rdev->constraints->max_uV);
 831                 if (ret < 0) {
 832                         rdev_err(rdev, "failed to apply %duV constraint\n",
 833                                  rdev->constraints->min_uV);
 834                         return ret;
 835                 }
 836         }
 837
 838         /* constrain machine-level voltage specs to fit
 839          * the actual range supported by this regulator.
 840          */
 841         if (ops->list_voltage && rdev->desc->n_voltages) {
 842                 int     count = rdev->desc->n_voltages;
 843                 int     i;
 844                 int     min_uV = INT_MAX;
 845                 int     max_uV = INT_MIN;
 846                 int     cmin = constraints->min_uV;
 847                 int     cmax = constraints->max_uV;
 848
 849                 /* it's safe to autoconfigure fixed-voltage supplies
 850                    and the constraints are used by list_voltage. */
 851                 if (count == 1 && !cmin) {
 852                         cmin = 1;
 853                         cmax = INT_MAX;
 854                         constraints->min_uV = cmin;
 855                         constraints->max_uV = cmax;
 856                 }
 857
 858                 /* voltage constraints are optional */
 859                 if ((cmin == 0) && (cmax == 0))
 860                         return 0;
 861
 862                 /* else require explicit machine-level constraints */
 863                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 864                         rdev_err(rdev, "invalid voltage constraints\n");
 865                         return -EINVAL;
 866                 }
 867
 868                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 869                 for (i = 0; i < count; i++) {
 870                         int     value;
 871
 872                         value = ops->list_voltage(rdev, i);
 873                         if (value <= 0)
 874                                 continue;
 875
 876                         /* maybe adjust [min_uV..max_uV] */
 877                         if (value >= cmin && value < min_uV)
 878                                 min_uV = value;
 879                         if (value <= cmax && value > max_uV)
 880                                 max_uV = value;
 881                 }
 882
 883                 /* final: [min_uV..max_uV] valid iff constraints valid */
 884                 if (max_uV < min_uV) {
 885                         rdev_err(rdev, "unsupportable voltage constraints\n");
 886                         return -EINVAL;
 887                 }
 888
 889                 /* use regulator's subset of machine constraints */
 890                 if (constraints->min_uV < min_uV) {
 891                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
 892                                  constraints->min_uV, min_uV);
 893                         constraints->min_uV = min_uV;
 894                 }
 895                 if (constraints->max_uV > max_uV) {
 896                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
 897                                  constraints->max_uV, max_uV);
 898                         constraints->max_uV = max_uV;
 899                 }
 900         }
 901
 902         return 0;
 903 }
 904
 905 /**
 906  * set_machine_constraints - sets regulator constraints
 907  * @rdev: regulator source
 908  * @constraints: constraints to apply
 909  *
 910  * Allows platform initialisation code to define and constrain
 911  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 912  * Constraints *must* be set by platform code in order for some
 913  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 914  * set_mode.
 915  */
 916 static int set_machine_constraints(struct regulator_dev *rdev,
 917         const struct regulation_constraints *constraints)
 918 {
 919         int ret = 0;
 920         struct regulator_ops *ops = rdev->desc->ops;
 921
 922         if (constraints)
 923                 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
 924                                             GFP_KERNEL);
 925         else
 926                 rdev->constraints = kzalloc(sizeof(*constraints),
 927                                             GFP_KERNEL);
 928         if (!rdev->constraints)
 929                 return -ENOMEM;
 930
 931         ret = machine_constraints_voltage(rdev, rdev->constraints);
 932         if (ret != 0)
 933                 goto out;
 934
 935         /* do we need to setup our suspend state */
 936         if (rdev->constraints->initial_state) {
 937                 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
 938                 if (ret < 0) {
 939                         rdev_err(rdev, "failed to set suspend state\n");
 940                         goto out;
 941                 }
 942         }
 943
 944         if (rdev->constraints->initial_mode) {
 945                 if (!ops->set_mode) {
 946                         rdev_err(rdev, "no set_mode operation\n");
 947                         ret = -EINVAL;
 948                         goto out;
 949                 }
 950
 951                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
 952                 if (ret < 0) {
 953                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
 954                         goto out;
 955                 }
 956         }
 957
 958         /* If the constraints say the regulator should be on at this point
 959          * and we have control then make sure it is enabled.
 960          */
 961         if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
 962             ops->enable) {
 963                 ret = ops->enable(rdev);
 964                 if (ret < 0) {
 965                         rdev_err(rdev, "failed to enable\n");
 966                         goto out;
 967                 }
 968         }
 969
 970         print_constraints(rdev);
 971         return 0;
 972 out:
 973         kfree(rdev->constraints);
 974         rdev->constraints = NULL;
 975         return ret;
 976 }
 977
 978 /**
 979  * set_supply - set regulator supply regulator
 980  * @rdev: regulator name
 981  * @supply_rdev: supply regulator name
 982  *
 983  * Called by platform initialisation code to set the supply regulator for this
 984  * regulator. This ensures that a regulators supply will also be enabled by the
 985  * core if it's child is enabled.
 986  */
 987 static int set_supply(struct regulator_dev *rdev,
 988                       struct regulator_dev *supply_rdev)
 989 {
 990         int err;
 991
 992         rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
 993
 994         rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
 995         if (rdev->supply == NULL) {
 996                 err = -ENOMEM;
 997                 return err;
 998         }
 999
1000         return 0;
1001 }
1002
1003 /**
1004  * set_consumer_device_supply - Bind a regulator to a symbolic supply
1005  * @rdev:         regulator source
1006  * @consumer_dev_name: dev_name() string for device supply applies to
1007  * @supply:       symbolic name for supply
1008  *
1009  * Allows platform initialisation code to map physical regulator
1010  * sources to symbolic names for supplies for use by devices.  Devices
1011  * should use these symbolic names to request regulators, avoiding the
1012  * need to provide board-specific regulator names as platform data.
1013  */
1014 static int set_consumer_device_supply(struct regulator_dev *rdev,
1015                                       const char *consumer_dev_name,
1016                                       const char *supply)
1017 {
1018         struct regulator_map *node;
1019         int has_dev;
1020
1021         if (supply == NULL)
1022                 return -EINVAL;
1023
1024         if (consumer_dev_name != NULL)
1025                 has_dev = 1;
1026         else
1027                 has_dev = 0;
1028
1029         list_for_each_entry(node, &regulator_map_list, list) {
1030                 if (node->dev_name && consumer_dev_name) {
1031                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
1032                                 continue;
1033                 } else if (node->dev_name || consumer_dev_name) {
1034                         continue;
1035                 }
1036
1037                 if (strcmp(node->supply, supply) != 0)
1038                         continue;
1039
1040                 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1041                          consumer_dev_name,
1042                          dev_name(&node->regulator->dev),
1043                          node->regulator->desc->name,
1044                          supply,
1045                          dev_name(&rdev->dev), rdev_get_name(rdev));
1046                 return -EBUSY;
1047         }
1048
1049         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1050         if (node == NULL)
1051                 return -ENOMEM;
1052
1053         node->regulator = rdev;
1054         node->supply = supply;
1055
1056         if (has_dev) {
1057                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1058                 if (node->dev_name == NULL) {
1059                         kfree(node);
1060                         return -ENOMEM;
1061                 }
1062         }
1063
1064         list_add(&node->list, &regulator_map_list);
1065         return 0;
1066 }
1067
1068 static void unset_regulator_supplies(struct regulator_dev *rdev)
1069 {
1070         struct regulator_map *node, *n;
1071
1072         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1073                 if (rdev == node->regulator) {
1074                         list_del(&node->list);
1075                         kfree(node->dev_name);
1076                         kfree(node);
1077                 }
1078         }
1079 }
1080
1081 #define REG_STR_SIZE    64
1082
1083 static struct regulator *create_regulator(struct regulator_dev *rdev,
1084                                           struct device *dev,
1085                                           const char *supply_name)
1086 {
1087         struct regulator *regulator;
1088         char buf[REG_STR_SIZE];
1089         int err, size;
1090
1091         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1092         if (regulator == NULL)
1093                 return NULL;
1094
1095         mutex_lock(&rdev->mutex);
1096         regulator->rdev = rdev;
1097         list_add(&regulator->list, &rdev->consumer_list);
1098
1099         if (dev) {
1100                 /* create a 'requested_microamps_name' sysfs entry */
1101                 size = scnprintf(buf, REG_STR_SIZE,
1102                                  "microamps_requested_%s-%s",
1103                                  dev_name(dev), supply_name);
1104                 if (size >= REG_STR_SIZE)
1105                         goto overflow_err;
1106
1107                 regulator->dev = dev;
1108                 sysfs_attr_init(&regulator->dev_attr.attr);
1109                 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1110                 if (regulator->dev_attr.attr.name == NULL)
1111                         goto attr_name_err;
1112
1113                 regulator->dev_attr.attr.mode = 0444;
1114                 regulator->dev_attr.show = device_requested_uA_show;
1115                 err = device_create_file(dev, &regulator->dev_attr);
1116                 if (err < 0) {
1117                         rdev_warn(rdev, "could not add regulator_dev requested microamps sysfs entry\n");
1118                         goto attr_name_err;
1119                 }
1120
1121                 /* also add a link to the device sysfs entry */
1122                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1123                                  dev->kobj.name, supply_name);
1124                 if (size >= REG_STR_SIZE)
1125                         goto attr_err;
1126
1127                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1128                 if (regulator->supply_name == NULL)
1129                         goto attr_err;
1130
1131                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1132                                         buf);
1133                 if (err) {
1134                         rdev_warn(rdev, "could not add device link %s err %d\n",
1135                                   dev->kobj.name, err);
1136                         goto link_name_err;
1137                 }
1138         } else {
1139                 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1140                 if (regulator->supply_name == NULL)
1141                         goto attr_err;
1142         }
1143
1144         regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1145                                                 rdev->debugfs);
1146         if (!regulator->debugfs) {
1147                 rdev_warn(rdev, "Failed to create debugfs directory\n");
1148         } else {
1149                 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1150                                    &regulator->uA_load);
1151                 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1152                                    &regulator->min_uV);
1153                 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1154                                    &regulator->max_uV);
1155         }
1156
1157         /*
1158          * Check now if the regulator is an always on regulator - if
1159          * it is then we don't need to do nearly so much work for
1160          * enable/disable calls.
1161          */
1162         if (!_regulator_can_change_status(rdev) &&
1163             _regulator_is_enabled(rdev))
1164                 regulator->always_on = true;
1165
1166         mutex_unlock(&rdev->mutex);
1167         return regulator;
1168 link_name_err:
1169         kfree(regulator->supply_name);
1170 attr_err:
1171         device_remove_file(regulator->dev, &regulator->dev_attr);
1172 attr_name_err:
1173         kfree(regulator->dev_attr.attr.name);
1174 overflow_err:
1175         list_del(&regulator->list);
1176         kfree(regulator);
1177         mutex_unlock(&rdev->mutex);
1178         return NULL;
1179 }
1180
1181 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1182 {
1183         if (!rdev->desc->ops->enable_time)
1184                 return 0;
1185         return rdev->desc->ops->enable_time(rdev);
1186 }
1187
1188 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1189                                                   const char *supply,
1190                                                   int *ret)
1191 {
1192         struct regulator_dev *r;
1193         struct device_node *node;
1194         struct regulator_map *map;
1195         const char *devname = NULL;
1196
1197         /* first do a dt based lookup */
1198         if (dev && dev->of_node) {
1199                 node = of_get_regulator(dev, supply);
1200                 if (node) {
1201                         list_for_each_entry(r, &regulator_list, list)
1202                                 if (r->dev.parent &&
1203                                         node == r->dev.of_node)
1204                                         return r;
1205                 } else {
1206                         /*
1207                          * If we couldn't even get the node then it's
1208                          * not just that the device didn't register
1209                          * yet, there's no node and we'll never
1210                          * succeed.
1211                          */
1212                         *ret = -ENODEV;
1213                 }
1214         }
1215
1216         /* if not found, try doing it non-dt way */
1217         if (dev)
1218                 devname = dev_name(dev);
1219
1220         list_for_each_entry(r, &regulator_list, list)
1221                 if (strcmp(rdev_get_name(r), supply) == 0)
1222                         return r;
1223
1224         list_for_each_entry(map, &regulator_map_list, list) {
1225                 /* If the mapping has a device set up it must match */
1226                 if (map->dev_name &&
1227                     (!devname || strcmp(map->dev_name, devname)))
1228                         continue;
1229
1230                 if (strcmp(map->supply, supply) == 0)
1231                         return map->regulator;
1232         }
1233
1234
1235         return NULL;
1236 }
1237
1238 /* Internal regulator request function */
1239 static struct regulator *_regulator_get(struct device *dev, const char *id,
1240                                         int exclusive)
1241 {
1242         struct regulator_dev *rdev;
1243         struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1244         const char *devname = NULL;
1245         int ret;
1246
1247         if (id == NULL) {
1248                 pr_err("get() with no identifier\n");
1249                 return regulator;
1250         }
1251
1252         if (dev)
1253                 devname = dev_name(dev);
1254
1255         mutex_lock(&regulator_list_mutex);
1256
1257         rdev = regulator_dev_lookup(dev, id, &ret);
1258         if (rdev)
1259                 goto found;
1260
1261         if (board_wants_dummy_regulator) {
1262                 rdev = dummy_regulator_rdev;
1263                 goto found;
1264         }
1265
1266 #ifdef CONFIG_REGULATOR_DUMMY
1267         if (!devname)
1268                 devname = "deviceless";
1269
1270         /* If the board didn't flag that it was fully constrained then
1271          * substitute in a dummy regulator so consumers can continue.
1272          */
1273         if (!has_full_constraints) {
1274                 pr_warn("%s supply %s not found, using dummy regulator\n",
1275                         devname, id);
1276                 rdev = dummy_regulator_rdev;
1277                 goto found;
1278         }
1279 #endif
1280
1281         mutex_unlock(&regulator_list_mutex);
1282         return regulator;
1283
1284 found:
1285         if (rdev->exclusive) {
1286                 regulator = ERR_PTR(-EPERM);
1287                 goto out;
1288         }
1289
1290         if (exclusive && rdev->open_count) {
1291                 regulator = ERR_PTR(-EBUSY);
1292                 goto out;
1293         }
1294
1295         if (!try_module_get(rdev->owner))
1296                 goto out;
1297
1298         regulator = create_regulator(rdev, dev, id);
1299         if (regulator == NULL) {
1300                 regulator = ERR_PTR(-ENOMEM);
1301                 module_put(rdev->owner);
1302                 goto out;
1303         }
1304
1305         rdev->open_count++;
1306         if (exclusive) {
1307                 rdev->exclusive = 1;
1308
1309                 ret = _regulator_is_enabled(rdev);
1310                 if (ret > 0)
1311                         rdev->use_count = 1;
1312                 else
1313                         rdev->use_count = 0;
1314         }
1315
1316 out:
1317         mutex_unlock(&regulator_list_mutex);
1318
1319         return regulator;
1320 }
1321
1322 /**
1323  * regulator_get - lookup and obtain a reference to a regulator.
1324  * @dev: device for regulator "consumer"
1325  * @id: Supply name or regulator ID.
1326  *
1327  * Returns a struct regulator corresponding to the regulator producer,
1328  * or IS_ERR() condition containing errno.
1329  *
1330  * Use of supply names configured via regulator_set_device_supply() is
1331  * strongly encouraged.  It is recommended that the supply name used
1332  * should match the name used for the supply and/or the relevant
1333  * device pins in the datasheet.
1334  */
1335 struct regulator *regulator_get(struct device *dev, const char *id)
1336 {
1337         return _regulator_get(dev, id, 0);
1338 }
1339 EXPORT_SYMBOL_GPL(regulator_get);
1340
1341 static void devm_regulator_release(struct device *dev, void *res)
1342 {
1343         regulator_put(*(struct regulator **)res);
1344 }
1345
1346 /**
1347  * devm_regulator_get - Resource managed regulator_get()
1348  * @dev: device for regulator "consumer"
1349  * @id: Supply name or regulator ID.
1350  *
1351  * Managed regulator_get(). Regulators returned from this function are
1352  * automatically regulator_put() on driver detach. See regulator_get() for more
1353  * information.
1354  */
1355 struct regulator *devm_regulator_get(struct device *dev, const char *id)
1356 {
1357         struct regulator **ptr, *regulator;
1358
1359         ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1360         if (!ptr)
1361                 return ERR_PTR(-ENOMEM);
1362
1363         regulator = regulator_get(dev, id);
1364         if (!IS_ERR(regulator)) {
1365                 *ptr = regulator;
1366                 devres_add(dev, ptr);
1367         } else {
1368                 devres_free(ptr);
1369         }
1370
1371         return regulator;
1372 }
1373 EXPORT_SYMBOL_GPL(devm_regulator_get);
1374
1375 /**
1376  * regulator_get_exclusive - obtain exclusive access to a regulator.
1377  * @dev: device for regulator "consumer"
1378  * @id: Supply name or regulator ID.
1379  *
1380  * Returns a struct regulator corresponding to the regulator producer,
1381  * or IS_ERR() condition containing errno.  Other consumers will be
1382  * unable to obtain this reference is held and the use count for the
1383  * regulator will be initialised to reflect the current state of the
1384  * regulator.
1385  *
1386  * This is intended for use by consumers which cannot tolerate shared
1387  * use of the regulator such as those which need to force the
1388  * regulator off for correct operation of the hardware they are
1389  * controlling.
1390  *
1391  * Use of supply names configured via regulator_set_device_supply() is
1392  * strongly encouraged.  It is recommended that the supply name used
1393  * should match the name used for the supply and/or the relevant
1394  * device pins in the datasheet.
1395  */
1396 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1397 {
1398         return _regulator_get(dev, id, 1);
1399 }
1400 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1401
1402 /**
1403  * regulator_put - "free" the regulator source
1404  * @regulator: regulator source
1405  *
1406  * Note: drivers must ensure that all regulator_enable calls made on this
1407  * regulator source are balanced by regulator_disable calls prior to calling
1408  * this function.
1409  */
1410 void regulator_put(struct regulator *regulator)
1411 {
1412         struct regulator_dev *rdev;
1413
1414         if (regulator == NULL || IS_ERR(regulator))
1415                 return;
1416
1417         mutex_lock(&regulator_list_mutex);
1418         rdev = regulator->rdev;
1419
1420         debugfs_remove_recursive(regulator->debugfs);
1421
1422         /* remove any sysfs entries */
1423         if (regulator->dev) {
1424                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1425                 device_remove_file(regulator->dev, &regulator->dev_attr);
1426                 kfree(regulator->dev_attr.attr.name);
1427         }
1428         kfree(regulator->supply_name);
1429         list_del(&regulator->list);
1430         kfree(regulator);
1431
1432         rdev->open_count--;
1433         rdev->exclusive = 0;
1434
1435         module_put(rdev->owner);
1436         mutex_unlock(&regulator_list_mutex);
1437 }
1438 EXPORT_SYMBOL_GPL(regulator_put);
1439
1440 static int devm_regulator_match(struct device *dev, void *res, void *data)
1441 {
1442         struct regulator **r = res;
1443         if (!r || !*r) {
1444                 WARN_ON(!r || !*r);
1445                 return 0;
1446         }
1447         return *r == data;
1448 }
1449
1450 /**
1451  * devm_regulator_put - Resource managed regulator_put()
1452  * @regulator: regulator to free
1453  *
1454  * Deallocate a regulator allocated with devm_regulator_get(). Normally
1455  * this function will not need to be called and the resource management
1456  * code will ensure that the resource is freed.
1457  */
1458 void devm_regulator_put(struct regulator *regulator)
1459 {
1460         int rc;
1461
1462         rc = devres_destroy(regulator->dev, devm_regulator_release,
1463                             devm_regulator_match, regulator);
1464         if (rc == 0)
1465                 regulator_put(regulator);
1466         else
1467                 WARN_ON(rc);
1468 }
1469 EXPORT_SYMBOL_GPL(devm_regulator_put);
1470
1471 /* locks held by regulator_enable() */
1472 static int _regulator_enable(struct regulator_dev *rdev)
1473 {
1474         int ret, delay;
1475
1476         /* check voltage and requested load before enabling */
1477         if (rdev->constraints &&
1478             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1479                 drms_uA_update(rdev);
1480
1481         if (rdev->use_count == 0) {
1482                 /* The regulator may on if it's not switchable or left on */
1483                 ret = _regulator_is_enabled(rdev);
1484                 if (ret == -EINVAL || ret == 0) {
1485                         if (!_regulator_can_change_status(rdev))
1486                                 return -EPERM;
1487
1488                         if (!rdev->desc->ops->enable)
1489                                 return -EINVAL;
1490
1491                         /* Query before enabling in case configuration
1492                          * dependent.  */
1493                         ret = _regulator_get_enable_time(rdev);
1494                         if (ret >= 0) {
1495                                 delay = ret;
1496                         } else {
1497                                 rdev_warn(rdev, "enable_time() failed: %d\n",
1498                                            ret);
1499                                 delay = 0;
1500                         }
1501
1502                         trace_regulator_enable(rdev_get_name(rdev));
1503
1504                         /* Allow the regulator to ramp; it would be useful
1505                          * to extend this for bulk operations so that the
1506                          * regulators can ramp together.  */
1507                         ret = rdev->desc->ops->enable(rdev);
1508                         if (ret < 0)
1509                                 return ret;
1510
1511                         trace_regulator_enable_delay(rdev_get_name(rdev));
1512
1513                         if (delay >= 1000) {
1514                                 mdelay(delay / 1000);
1515                                 udelay(delay % 1000);
1516                         } else if (delay) {
1517                                 udelay(delay);
1518                         }
1519
1520                         trace_regulator_enable_complete(rdev_get_name(rdev));
1521
1522                 } else if (ret < 0) {
1523                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1524                         return ret;
1525                 }
1526                 /* Fallthrough on positive return values - already enabled */
1527         }
1528
1529         rdev->use_count++;
1530
1531         return 0;
1532 }
1533
1534 /**
1535  * regulator_enable - enable regulator output
1536  * @regulator: regulator source
1537  *
1538  * Request that the regulator be enabled with the regulator output at
1539  * the predefined voltage or current value.  Calls to regulator_enable()
1540  * must be balanced with calls to regulator_disable().
1541  *
1542  * NOTE: the output value can be set by other drivers, boot loader or may be
1543  * hardwired in the regulator.
1544  */
1545 int regulator_enable(struct regulator *regulator)
1546 {
1547         struct regulator_dev *rdev = regulator->rdev;
1548         int ret = 0;
1549
1550         if (regulator->always_on)
1551                 return 0;
1552
1553         if (rdev->supply) {
1554                 ret = regulator_enable(rdev->supply);
1555                 if (ret != 0)
1556                         return ret;
1557         }
1558
1559         mutex_lock(&rdev->mutex);
1560         ret = _regulator_enable(rdev);
1561         mutex_unlock(&rdev->mutex);
1562
1563         if (ret != 0 && rdev->supply)
1564                 regulator_disable(rdev->supply);
1565
1566         return ret;
1567 }
1568 EXPORT_SYMBOL_GPL(regulator_enable);
1569
1570 /* locks held by regulator_disable() */
1571 static int _regulator_disable(struct regulator_dev *rdev)
1572 {
1573         int ret = 0;
1574
1575         if (WARN(rdev->use_count <= 0,
1576                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
1577                 return -EIO;
1578
1579         /* are we the last user and permitted to disable ? */
1580         if (rdev->use_count == 1 &&
1581             (rdev->constraints && !rdev->constraints->always_on)) {
1582
1583                 /* we are last user */
1584                 if (_regulator_can_change_status(rdev) &&
1585                     rdev->desc->ops->disable) {
1586                         trace_regulator_disable(rdev_get_name(rdev));
1587
1588                         ret = rdev->desc->ops->disable(rdev);
1589                         if (ret < 0) {
1590                                 rdev_err(rdev, "failed to disable\n");
1591                                 return ret;
1592                         }
1593
1594                         trace_regulator_disable_complete(rdev_get_name(rdev));
1595
1596                         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1597                                              NULL);
1598                 }
1599
1600                 rdev->use_count = 0;
1601         } else if (rdev->use_count > 1) {
1602
1603                 if (rdev->constraints &&
1604                         (rdev->constraints->valid_ops_mask &
1605                         REGULATOR_CHANGE_DRMS))
1606                         drms_uA_update(rdev);
1607
1608                 rdev->use_count--;
1609         }
1610
1611         return ret;
1612 }
1613
1614 /**
1615  * regulator_disable - disable regulator output
1616  * @regulator: regulator source
1617  *
1618  * Disable the regulator output voltage or current.  Calls to
1619  * regulator_enable() must be balanced with calls to
1620  * regulator_disable().
1621  *
1622  * NOTE: this will only disable the regulator output if no other consumer
1623  * devices have it enabled, the regulator device supports disabling and
1624  * machine constraints permit this operation.
1625  */
1626 int regulator_disable(struct regulator *regulator)
1627 {
1628         struct regulator_dev *rdev = regulator->rdev;
1629         int ret = 0;
1630
1631         if (regulator->always_on)
1632                 return 0;
1633
1634         mutex_lock(&rdev->mutex);
1635         ret = _regulator_disable(rdev);
1636         mutex_unlock(&rdev->mutex);
1637
1638         if (ret == 0 && rdev->supply)
1639                 regulator_disable(rdev->supply);
1640
1641         return ret;
1642 }
1643 EXPORT_SYMBOL_GPL(regulator_disable);
1644
1645 /* locks held by regulator_force_disable() */
1646 static int _regulator_force_disable(struct regulator_dev *rdev)
1647 {
1648         int ret = 0;
1649
1650         /* force disable */
1651         if (rdev->desc->ops->disable) {
1652                 /* ah well, who wants to live forever... */
1653                 ret = rdev->desc->ops->disable(rdev);
1654                 if (ret < 0) {
1655                         rdev_err(rdev, "failed to force disable\n");
1656                         return ret;
1657                 }
1658                 /* notify other consumers that power has been forced off */
1659                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1660                         REGULATOR_EVENT_DISABLE, NULL);
1661         }
1662
1663         return ret;
1664 }
1665
1666 /**
1667  * regulator_force_disable - force disable regulator output
1668  * @regulator: regulator source
1669  *
1670  * Forcibly disable the regulator output voltage or current.
1671  * NOTE: this *will* disable the regulator output even if other consumer
1672  * devices have it enabled. This should be used for situations when device
1673  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1674  */
1675 int regulator_force_disable(struct regulator *regulator)
1676 {
1677         struct regulator_dev *rdev = regulator->rdev;
1678         int ret;
1679
1680         mutex_lock(&rdev->mutex);
1681         regulator->uA_load = 0;
1682         ret = _regulator_force_disable(regulator->rdev);
1683         mutex_unlock(&rdev->mutex);
1684
1685         if (rdev->supply)
1686                 while (rdev->open_count--)
1687                         regulator_disable(rdev->supply);
1688
1689         return ret;
1690 }
1691 EXPORT_SYMBOL_GPL(regulator_force_disable);
1692
1693 static void regulator_disable_work(struct work_struct *work)
1694 {
1695         struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1696                                                   disable_work.work);
1697         int count, i, ret;
1698
1699         mutex_lock(&rdev->mutex);
1700
1701         BUG_ON(!rdev->deferred_disables);
1702
1703         count = rdev->deferred_disables;
1704         rdev->deferred_disables = 0;
1705
1706         for (i = 0; i < count; i++) {
1707                 ret = _regulator_disable(rdev);
1708                 if (ret != 0)
1709                         rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1710         }
1711
1712         mutex_unlock(&rdev->mutex);
1713
1714         if (rdev->supply) {
1715                 for (i = 0; i < count; i++) {
1716                         ret = regulator_disable(rdev->supply);
1717                         if (ret != 0) {
1718                                 rdev_err(rdev,
1719                                          "Supply disable failed: %d\n", ret);
1720                         }
1721                 }
1722         }
1723 }
1724
1725 /**
1726  * regulator_disable_deferred - disable regulator output with delay
1727  * @regulator: regulator source
1728  * @ms: miliseconds until the regulator is disabled
1729  *
1730  * Execute regulator_disable() on the regulator after a delay.  This
1731  * is intended for use with devices that require some time to quiesce.
1732  *
1733  * NOTE: this will only disable the regulator output if no other consumer
1734  * devices have it enabled, the regulator device supports disabling and
1735  * machine constraints permit this operation.
1736  */
1737 int regulator_disable_deferred(struct regulator *regulator, int ms)
1738 {
1739         struct regulator_dev *rdev = regulator->rdev;
1740         int ret;
1741
1742         if (regulator->always_on)
1743                 return 0;
1744
1745         mutex_lock(&rdev->mutex);
1746         rdev->deferred_disables++;
1747         mutex_unlock(&rdev->mutex);
1748
1749         ret = schedule_delayed_work(&rdev->disable_work,
1750                                     msecs_to_jiffies(ms));
1751         if (ret < 0)
1752                 return ret;
1753         else
1754                 return 0;
1755 }
1756 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1757
1758 /**
1759  * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1760  *
1761  * @rdev: regulator to operate on
1762  *
1763  * Regulators that use regmap for their register I/O can set the
1764  * enable_reg and enable_mask fields in their descriptor and then use
1765  * this as their is_enabled operation, saving some code.
1766  */
1767 int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1768 {
1769         unsigned int val;
1770         int ret;
1771
1772         ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1773         if (ret != 0)
1774                 return ret;
1775
1776         return (val & rdev->desc->enable_mask) != 0;
1777 }
1778 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1779
1780 /**
1781  * regulator_enable_regmap - standard enable() for regmap users
1782  *
1783  * @rdev: regulator to operate on
1784  *
1785  * Regulators that use regmap for their register I/O can set the
1786  * enable_reg and enable_mask fields in their descriptor and then use
1787  * this as their enable() operation, saving some code.
1788  */
1789 int regulator_enable_regmap(struct regulator_dev *rdev)
1790 {
1791         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1792                                   rdev->desc->enable_mask,
1793                                   rdev->desc->enable_mask);
1794 }
1795 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1796
1797 /**
1798  * regulator_disable_regmap - standard disable() for regmap users
1799  *
1800  * @rdev: regulator to operate on
1801  *
1802  * Regulators that use regmap for their register I/O can set the
1803  * enable_reg and enable_mask fields in their descriptor and then use
1804  * this as their disable() operation, saving some code.
1805  */
1806 int regulator_disable_regmap(struct regulator_dev *rdev)
1807 {
1808         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1809                                   rdev->desc->enable_mask, 0);
1810 }
1811 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1812
1813 static int _regulator_is_enabled(struct regulator_dev *rdev)
1814 {
1815         /* If we don't know then assume that the regulator is always on */
1816         if (!rdev->desc->ops->is_enabled)
1817                 return 1;
1818
1819         return rdev->desc->ops->is_enabled(rdev);
1820 }
1821
1822 /**
1823  * regulator_is_enabled - is the regulator output enabled
1824  * @regulator: regulator source
1825  *
1826  * Returns positive if the regulator driver backing the source/client
1827  * has requested that the device be enabled, zero if it hasn't, else a
1828  * negative errno code.
1829  *
1830  * Note that the device backing this regulator handle can have multiple
1831  * users, so it might be enabled even if regulator_enable() was never
1832  * called for this particular source.
1833  */
1834 int regulator_is_enabled(struct regulator *regulator)
1835 {
1836         int ret;
1837
1838         if (regulator->always_on)
1839                 return 1;
1840
1841         mutex_lock(&regulator->rdev->mutex);
1842         ret = _regulator_is_enabled(regulator->rdev);
1843         mutex_unlock(&regulator->rdev->mutex);
1844
1845         return ret;
1846 }
1847 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1848
1849 /**
1850  * regulator_count_voltages - count regulator_list_voltage() selectors
1851  * @regulator: regulator source
1852  *
1853  * Returns number of selectors, or negative errno.  Selectors are
1854  * numbered starting at zero, and typically correspond to bitfields
1855  * in hardware registers.
1856  */
1857 int regulator_count_voltages(struct regulator *regulator)
1858 {
1859         struct regulator_dev    *rdev = regulator->rdev;
1860
1861         return rdev->desc->n_voltages ? : -EINVAL;
1862 }
1863 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1864
1865 /**
1866  * regulator_list_voltage_linear - List voltages with simple calculation
1867  *
1868  * @rdev: Regulator device
1869  * @selector: Selector to convert into a voltage
1870  *
1871  * Regulators with a simple linear mapping between voltages and
1872  * selectors can set min_uV and uV_step in the regulator descriptor
1873  * and then use this function as their list_voltage() operation,
1874  */
1875 int regulator_list_voltage_linear(struct regulator_dev *rdev,
1876                                   unsigned int selector)
1877 {
1878         if (selector >= rdev->desc->n_voltages)
1879                 return -EINVAL;
1880
1881         return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1882 }
1883 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1884
1885 /**
1886  * regulator_list_voltage - enumerate supported voltages
1887  * @regulator: regulator source
1888  * @selector: identify voltage to list
1889  * Context: can sleep
1890  *
1891  * Returns a voltage that can be passed to @regulator_set_voltage(),
1892  * zero if this selector code can't be used on this system, or a
1893  * negative errno.
1894  */
1895 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1896 {
1897         struct regulator_dev    *rdev = regulator->rdev;
1898         struct regulator_ops    *ops = rdev->desc->ops;
1899         int                     ret;
1900
1901         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1902                 return -EINVAL;
1903
1904         mutex_lock(&rdev->mutex);
1905         ret = ops->list_voltage(rdev, selector);
1906         mutex_unlock(&rdev->mutex);
1907
1908         if (ret > 0) {
1909                 if (ret < rdev->constraints->min_uV)
1910                         ret = 0;
1911                 else if (ret > rdev->constraints->max_uV)
1912                         ret = 0;
1913         }
1914
1915         return ret;
1916 }
1917 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1918
1919 /**
1920  * regulator_is_supported_voltage - check if a voltage range can be supported
1921  *
1922  * @regulator: Regulator to check.
1923  * @min_uV: Minimum required voltage in uV.
1924  * @max_uV: Maximum required voltage in uV.
1925  *
1926  * Returns a boolean or a negative error code.
1927  */
1928 int regulator_is_supported_voltage(struct regulator *regulator,
1929                                    int min_uV, int max_uV)
1930 {
1931         int i, voltages, ret;
1932
1933         ret = regulator_count_voltages(regulator);
1934         if (ret < 0)
1935                 return ret;
1936         voltages = ret;
1937
1938         for (i = 0; i < voltages; i++) {
1939                 ret = regulator_list_voltage(regulator, i);
1940
1941                 if (ret >= min_uV && ret <= max_uV)
1942                         return 1;
1943         }
1944
1945         return 0;
1946 }
1947 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
1948
1949 /**
1950  * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1951  *
1952  * @rdev: regulator to operate on
1953  *
1954  * Regulators that use regmap for their register I/O can set the
1955  * vsel_reg and vsel_mask fields in their descriptor and then use this
1956  * as their get_voltage_vsel operation, saving some code.
1957  */
1958 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
1959 {
1960         unsigned int val;
1961         int ret;
1962
1963         ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
1964         if (ret != 0)
1965                 return ret;
1966
1967         val &= rdev->desc->vsel_mask;
1968         val >>= ffs(rdev->desc->vsel_mask) - 1;
1969
1970         return val;
1971 }
1972 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
1973
1974 /**
1975  * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
1976  *
1977  * @rdev: regulator to operate on
1978  * @sel: Selector to set
1979  *
1980  * Regulators that use regmap for their register I/O can set the
1981  * vsel_reg and vsel_mask fields in their descriptor and then use this
1982  * as their set_voltage_vsel operation, saving some code.
1983  */
1984 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
1985 {
1986         sel <<= ffs(rdev->desc->vsel_mask) - 1;
1987
1988         return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
1989                                   rdev->desc->vsel_mask, sel);
1990 }
1991 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
1992
1993 /**
1994  * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
1995  *
1996  * @rdev: Regulator to operate on
1997  * @min_uV: Lower bound for voltage
1998  * @max_uV: Upper bound for voltage
1999  *
2000  * Drivers implementing set_voltage_sel() and list_voltage() can use
2001  * this as their map_voltage() operation.  It will find a suitable
2002  * voltage by calling list_voltage() until it gets something in bounds
2003  * for the requested voltages.
2004  */
2005 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2006                                   int min_uV, int max_uV)
2007 {
2008         int best_val = INT_MAX;
2009         int selector = 0;
2010         int i, ret;
2011
2012         /* Find the smallest voltage that falls within the specified
2013          * range.
2014          */
2015         for (i = 0; i < rdev->desc->n_voltages; i++) {
2016                 ret = rdev->desc->ops->list_voltage(rdev, i);
2017                 if (ret < 0)
2018                         continue;
2019
2020                 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2021                         best_val = ret;
2022                         selector = i;
2023                 }
2024         }
2025
2026         if (best_val != INT_MAX)
2027                 return selector;
2028         else
2029                 return -EINVAL;
2030 }
2031 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2032
2033 /**
2034  * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2035  *
2036  * @rdev: Regulator to operate on
2037  * @min_uV: Lower bound for voltage
2038  * @max_uV: Upper bound for voltage
2039  *
2040  * Drivers providing min_uV and uV_step in their regulator_desc can
2041  * use this as their map_voltage() operation.
2042  */
2043 int regulator_map_voltage_linear(struct regulator_dev *rdev,
2044                                  int min_uV, int max_uV)
2045 {
2046         int ret, voltage;
2047
2048         if (!rdev->desc->uV_step) {
2049                 BUG_ON(!rdev->desc->uV_step);
2050                 return -EINVAL;
2051         }
2052
2053         if (min_uV < rdev->desc->min_uV)
2054                 min_uV = rdev->desc->min_uV;
2055
2056         ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
2057         if (ret < 0)
2058                 return ret;
2059
2060         /* Map back into a voltage to verify we're still in bounds */
2061         voltage = rdev->desc->ops->list_voltage(rdev, ret);
2062         if (voltage < min_uV || voltage > max_uV)
2063                 return -EINVAL;
2064
2065         return ret;
2066 }
2067 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2068
2069 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2070                                      int min_uV, int max_uV)
2071 {
2072         int ret;
2073         int delay = 0;
2074         int best_val;
2075         unsigned int selector;
2076         int old_selector = -1;
2077
2078         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2079
2080         min_uV += rdev->constraints->uV_offset;
2081         max_uV += rdev->constraints->uV_offset;
2082
2083         /*
2084          * If we can't obtain the old selector there is not enough
2085          * info to call set_voltage_time_sel().
2086          */
2087         if (rdev->desc->ops->set_voltage_time_sel &&
2088             rdev->desc->ops->get_voltage_sel) {
2089                 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2090                 if (old_selector < 0)
2091                         return old_selector;
2092         }
2093
2094         if (rdev->desc->ops->set_voltage) {
2095                 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2096                                                    &selector);
2097         } else if (rdev->desc->ops->set_voltage_sel) {
2098                 if (rdev->desc->ops->map_voltage)
2099                         ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2100                                                            max_uV);
2101                 else
2102                         ret = regulator_map_voltage_iterate(rdev, min_uV,
2103                                                             max_uV);
2104
2105                 if (ret >= 0) {
2106                         selector = ret;
2107                         ret = rdev->desc->ops->set_voltage_sel(rdev, ret);
2108                 }
2109         } else {
2110                 ret = -EINVAL;
2111         }
2112
2113         if (rdev->desc->ops->list_voltage)
2114                 best_val = rdev->desc->ops->list_voltage(rdev, selector);
2115         else
2116                 best_val = -1;
2117
2118         /* Call set_voltage_time_sel if successfully obtained old_selector */
2119         if (ret == 0 && old_selector >= 0 &&
2120             rdev->desc->ops->set_voltage_time_sel) {
2121
2122                 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2123                                                 old_selector, selector);
2124                 if (delay < 0) {
2125                         rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2126                                   delay);
2127                         delay = 0;
2128                 }
2129         }
2130
2131         /* Insert any necessary delays */
2132         if (delay >= 1000) {
2133                 mdelay(delay / 1000);
2134                 udelay(delay % 1000);
2135         } else if (delay) {
2136                 udelay(delay);
2137         }
2138
2139         if (ret == 0)
2140                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2141                                      NULL);
2142
2143         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2144
2145         return ret;
2146 }
2147
2148 /**
2149  * regulator_set_voltage - set regulator output voltage
2150  * @regulator: regulator source
2151  * @min_uV: Minimum required voltage in uV
2152  * @max_uV: Maximum acceptable voltage in uV
2153  *
2154  * Sets a voltage regulator to the desired output voltage. This can be set
2155  * during any regulator state. IOW, regulator can be disabled or enabled.
2156  *
2157  * If the regulator is enabled then the voltage will change to the new value
2158  * immediately otherwise if the regulator is disabled the regulator will
2159  * output at the new voltage when enabled.
2160  *
2161  * NOTE: If the regulator is shared between several devices then the lowest
2162  * request voltage that meets the system constraints will be used.
2163  * Regulator system constraints must be set for this regulator before
2164  * calling this function otherwise this call will fail.
2165  */
2166 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2167 {
2168         struct regulator_dev *rdev = regulator->rdev;
2169         int ret = 0;
2170
2171         mutex_lock(&rdev->mutex);
2172
2173         /* If we're setting the same range as last time the change
2174          * should be a noop (some cpufreq implementations use the same
2175          * voltage for multiple frequencies, for example).
2176          */
2177         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2178                 goto out;
2179
2180         /* sanity check */
2181         if (!rdev->desc->ops->set_voltage &&
2182             !rdev->desc->ops->set_voltage_sel) {
2183                 ret = -EINVAL;
2184                 goto out;
2185         }
2186
2187         /* constraints check */
2188         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2189         if (ret < 0)
2190                 goto out;
2191         regulator->min_uV = min_uV;
2192         regulator->max_uV = max_uV;
2193
2194         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2195         if (ret < 0)
2196                 goto out;
2197
2198         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2199
2200 out:
2201         mutex_unlock(&rdev->mutex);
2202         return ret;
2203 }
2204 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2205
2206 /**
2207  * regulator_set_voltage_time - get raise/fall time
2208  * @regulator: regulator source
2209  * @old_uV: starting voltage in microvolts
2210  * @new_uV: target voltage in microvolts
2211  *
2212  * Provided with the starting and ending voltage, this function attempts to
2213  * calculate the time in microseconds required to rise or fall to this new
2214  * voltage.
2215  */
2216 int regulator_set_voltage_time(struct regulator *regulator,
2217                                int old_uV, int new_uV)
2218 {
2219         struct regulator_dev    *rdev = regulator->rdev;
2220         struct regulator_ops    *ops = rdev->desc->ops;
2221         int old_sel = -1;
2222         int new_sel = -1;
2223         int voltage;
2224         int i;
2225
2226         /* Currently requires operations to do this */
2227         if (!ops->list_voltage || !ops->set_voltage_time_sel
2228             || !rdev->desc->n_voltages)
2229                 return -EINVAL;
2230
2231         for (i = 0; i < rdev->desc->n_voltages; i++) {
2232                 /* We only look for exact voltage matches here */
2233                 voltage = regulator_list_voltage(regulator, i);
2234                 if (voltage < 0)
2235                         return -EINVAL;
2236                 if (voltage == 0)
2237                         continue;
2238                 if (voltage == old_uV)
2239                         old_sel = i;
2240                 if (voltage == new_uV)
2241                         new_sel = i;
2242         }
2243
2244         if (old_sel < 0 || new_sel < 0)
2245                 return -EINVAL;
2246
2247         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2248 }
2249 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2250
2251 /**
2252  * regulator_sync_voltage - re-apply last regulator output voltage
2253  * @regulator: regulator source
2254  *
2255  * Re-apply the last configured voltage.  This is intended to be used
2256  * where some external control source the consumer is cooperating with
2257  * has caused the configured voltage to change.
2258  */
2259 int regulator_sync_voltage(struct regulator *regulator)
2260 {
2261         struct regulator_dev *rdev = regulator->rdev;
2262         int ret, min_uV, max_uV;
2263
2264         mutex_lock(&rdev->mutex);
2265
2266         if (!rdev->desc->ops->set_voltage &&
2267             !rdev->desc->ops->set_voltage_sel) {
2268                 ret = -EINVAL;
2269                 goto out;
2270         }
2271
2272         /* This is only going to work if we've had a voltage configured. */
2273         if (!regulator->min_uV && !regulator->max_uV) {
2274                 ret = -EINVAL;
2275                 goto out;
2276         }
2277
2278         min_uV = regulator->min_uV;
2279         max_uV = regulator->max_uV;
2280
2281         /* This should be a paranoia check... */
2282         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2283         if (ret < 0)
2284                 goto out;
2285
2286         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2287         if (ret < 0)
2288                 goto out;
2289
2290         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2291
2292 out:
2293         mutex_unlock(&rdev->mutex);
2294         return ret;
2295 }
2296 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2297
2298 static int _regulator_get_voltage(struct regulator_dev *rdev)
2299 {
2300         int sel, ret;
2301
2302         if (rdev->desc->ops->get_voltage_sel) {
2303                 sel = rdev->desc->ops->get_voltage_sel(rdev);
2304                 if (sel < 0)
2305                         return sel;
2306                 ret = rdev->desc->ops->list_voltage(rdev, sel);
2307         } else if (rdev->desc->ops->get_voltage) {
2308                 ret = rdev->desc->ops->get_voltage(rdev);
2309         } else {
2310                 return -EINVAL;
2311         }
2312
2313         if (ret < 0)
2314                 return ret;
2315         return ret - rdev->constraints->uV_offset;
2316 }
2317
2318 /**
2319  * regulator_get_voltage - get regulator output voltage
2320  * @regulator: regulator source
2321  *
2322  * This returns the current regulator voltage in uV.
2323  *
2324  * NOTE: If the regulator is disabled it will return the voltage value. This
2325  * function should not be used to determine regulator state.
2326  */
2327 int regulator_get_voltage(struct regulator *regulator)
2328 {
2329         int ret;
2330
2331         mutex_lock(&regulator->rdev->mutex);
2332
2333         ret = _regulator_get_voltage(regulator->rdev);
2334
2335         mutex_unlock(&regulator->rdev->mutex);
2336
2337         return ret;
2338 }
2339 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2340
2341 /**
2342  * regulator_set_current_limit - set regulator output current limit
2343  * @regulator: regulator source
2344  * @min_uA: Minimuum supported current in uA
2345  * @max_uA: Maximum supported current in uA
2346  *
2347  * Sets current sink to the desired output current. This can be set during
2348  * any regulator state. IOW, regulator can be disabled or enabled.
2349  *
2350  * If the regulator is enabled then the current will change to the new value
2351  * immediately otherwise if the regulator is disabled the regulator will
2352  * output at the new current when enabled.
2353  *
2354  * NOTE: Regulator system constraints must be set for this regulator before
2355  * calling this function otherwise this call will fail.
2356  */
2357 int regulator_set_current_limit(struct regulator *regulator,
2358                                int min_uA, int max_uA)
2359 {
2360         struct regulator_dev *rdev = regulator->rdev;
2361         int ret;
2362
2363         mutex_lock(&rdev->mutex);
2364
2365         /* sanity check */
2366         if (!rdev->desc->ops->set_current_limit) {
2367                 ret = -EINVAL;
2368                 goto out;
2369         }
2370
2371         /* constraints check */
2372         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2373         if (ret < 0)
2374                 goto out;
2375
2376         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2377 out:
2378         mutex_unlock(&rdev->mutex);
2379         return ret;
2380 }
2381 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2382
2383 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2384 {
2385         int ret;
2386
2387         mutex_lock(&rdev->mutex);
2388
2389         /* sanity check */
2390         if (!rdev->desc->ops->get_current_limit) {
2391                 ret = -EINVAL;
2392                 goto out;
2393         }
2394
2395         ret = rdev->desc->ops->get_current_limit(rdev);
2396 out:
2397         mutex_unlock(&rdev->mutex);
2398         return ret;
2399 }
2400
2401 /**
2402  * regulator_get_current_limit - get regulator output current
2403  * @regulator: regulator source
2404  *
2405  * This returns the current supplied by the specified current sink in uA.
2406  *
2407  * NOTE: If the regulator is disabled it will return the current value. This
2408  * function should not be used to determine regulator state.
2409  */
2410 int regulator_get_current_limit(struct regulator *regulator)
2411 {
2412         return _regulator_get_current_limit(regulator->rdev);
2413 }
2414 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2415
2416 /**
2417  * regulator_set_mode - set regulator operating mode
2418  * @regulator: regulator source
2419  * @mode: operating mode - one of the REGULATOR_MODE constants
2420  *
2421  * Set regulator operating mode to increase regulator efficiency or improve
2422  * regulation performance.
2423  *
2424  * NOTE: Regulator system constraints must be set for this regulator before
2425  * calling this function otherwise this call will fail.
2426  */
2427 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2428 {
2429         struct regulator_dev *rdev = regulator->rdev;
2430         int ret;
2431         int regulator_curr_mode;
2432
2433         mutex_lock(&rdev->mutex);
2434
2435         /* sanity check */
2436         if (!rdev->desc->ops->set_mode) {
2437                 ret = -EINVAL;
2438                 goto out;
2439         }
2440
2441         /* return if the same mode is requested */
2442         if (rdev->desc->ops->get_mode) {
2443                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2444                 if (regulator_curr_mode == mode) {
2445                         ret = 0;
2446                         goto out;
2447                 }
2448         }
2449
2450         /* constraints check */
2451         ret = regulator_mode_constrain(rdev, &mode);
2452         if (ret < 0)
2453                 goto out;
2454
2455         ret = rdev->desc->ops->set_mode(rdev, mode);
2456 out:
2457         mutex_unlock(&rdev->mutex);
2458         return ret;
2459 }
2460 EXPORT_SYMBOL_GPL(regulator_set_mode);
2461
2462 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2463 {
2464         int ret;
2465
2466         mutex_lock(&rdev->mutex);
2467
2468         /* sanity check */
2469         if (!rdev->desc->ops->get_mode) {
2470                 ret = -EINVAL;
2471                 goto out;
2472         }
2473
2474         ret = rdev->desc->ops->get_mode(rdev);
2475 out:
2476         mutex_unlock(&rdev->mutex);
2477         return ret;
2478 }
2479
2480 /**
2481  * regulator_get_mode - get regulator operating mode
2482  * @regulator: regulator source
2483  *
2484  * Get the current regulator operating mode.
2485  */
2486 unsigned int regulator_get_mode(struct regulator *regulator)
2487 {
2488         return _regulator_get_mode(regulator->rdev);
2489 }
2490 EXPORT_SYMBOL_GPL(regulator_get_mode);
2491
2492 /**
2493  * regulator_set_optimum_mode - set regulator optimum operating mode
2494  * @regulator: regulator source
2495  * @uA_load: load current
2496  *
2497  * Notifies the regulator core of a new device load. This is then used by
2498  * DRMS (if enabled by constraints) to set the most efficient regulator
2499  * operating mode for the new regulator loading.
2500  *
2501  * Consumer devices notify their supply regulator of the maximum power
2502  * they will require (can be taken from device datasheet in the power
2503  * consumption tables) when they change operational status and hence power
2504  * state. Examples of operational state changes that can affect power
2505  * consumption are :-
2506  *
2507  *    o Device is opened / closed.
2508  *    o Device I/O is about to begin or has just finished.
2509  *    o Device is idling in between work.
2510  *
2511  * This information is also exported via sysfs to userspace.
2512  *
2513  * DRMS will sum the total requested load on the regulator and change
2514  * to the most efficient operating mode if platform constraints allow.
2515  *
2516  * Returns the new regulator mode or error.
2517  */
2518 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2519 {
2520         struct regulator_dev *rdev = regulator->rdev;
2521         struct regulator *consumer;
2522         int ret, output_uV, input_uV = 0, total_uA_load = 0;
2523         unsigned int mode;
2524
2525         if (rdev->supply)
2526                 input_uV = regulator_get_voltage(rdev->supply);
2527
2528         mutex_lock(&rdev->mutex);
2529
2530         /*
2531          * first check to see if we can set modes at all, otherwise just
2532          * tell the consumer everything is OK.
2533          */
2534         regulator->uA_load = uA_load;
2535         ret = regulator_check_drms(rdev);
2536         if (ret < 0) {
2537                 ret = 0;
2538                 goto out;
2539         }
2540
2541         if (!rdev->desc->ops->get_optimum_mode)
2542                 goto out;
2543
2544         /*
2545          * we can actually do this so any errors are indicators of
2546          * potential real failure.
2547          */
2548         ret = -EINVAL;
2549
2550         if (!rdev->desc->ops->set_mode)
2551                 goto out;
2552
2553         /* get output voltage */
2554         output_uV = _regulator_get_voltage(rdev);
2555         if (output_uV <= 0) {
2556                 rdev_err(rdev, "invalid output voltage found\n");
2557                 goto out;
2558         }
2559
2560         /* No supply? Use constraint voltage */
2561         if (input_uV <= 0)
2562                 input_uV = rdev->constraints->input_uV;
2563         if (input_uV <= 0) {
2564                 rdev_err(rdev, "invalid input voltage found\n");
2565                 goto out;
2566         }
2567
2568         /* calc total requested load for this regulator */
2569         list_for_each_entry(consumer, &rdev->consumer_list, list)
2570                 total_uA_load += consumer->uA_load;
2571
2572         mode = rdev->desc->ops->get_optimum_mode(rdev,
2573                                                  input_uV, output_uV,
2574                                                  total_uA_load);
2575         ret = regulator_mode_constrain(rdev, &mode);
2576         if (ret < 0) {
2577                 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2578                          total_uA_load, input_uV, output_uV);
2579                 goto out;
2580         }
2581
2582         ret = rdev->desc->ops->set_mode(rdev, mode);
2583         if (ret < 0) {
2584                 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2585                 goto out;
2586         }
2587         ret = mode;
2588 out:
2589         mutex_unlock(&rdev->mutex);
2590         return ret;
2591 }
2592 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2593
2594 /**
2595  * regulator_register_notifier - register regulator event notifier
2596  * @regulator: regulator source
2597  * @nb: notifier block
2598  *
2599  * Register notifier block to receive regulator events.
2600  */
2601 int regulator_register_notifier(struct regulator *regulator,
2602                               struct notifier_block *nb)
2603 {
2604         return blocking_notifier_chain_register(&regulator->rdev->notifier,
2605                                                 nb);
2606 }
2607 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2608
2609 /**
2610  * regulator_unregister_notifier - unregister regulator event notifier
2611  * @regulator: regulator source
2612  * @nb: notifier block
2613  *
2614  * Unregister regulator event notifier block.
2615  */
2616 int regulator_unregister_notifier(struct regulator *regulator,
2617                                 struct notifier_block *nb)
2618 {
2619         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2620                                                   nb);
2621 }
2622 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2623
2624 /* notify regulator consumers and downstream regulator consumers.
2625  * Note mutex must be held by caller.
2626  */
2627 static void _notifier_call_chain(struct regulator_dev *rdev,
2628                                   unsigned long event, void *data)
2629 {
2630         /* call rdev chain first */
2631         blocking_notifier_call_chain(&rdev->notifier, event, NULL);
2632 }
2633
2634 /**
2635  * regulator_bulk_get - get multiple regulator consumers
2636  *
2637  * @dev:           Device to supply
2638  * @num_consumers: Number of consumers to register
2639  * @consumers:     Configuration of consumers; clients are stored here.
2640  *
2641  * @return 0 on success, an errno on failure.
2642  *
2643  * This helper function allows drivers to get several regulator
2644  * consumers in one operation.  If any of the regulators cannot be
2645  * acquired then any regulators that were allocated will be freed
2646  * before returning to the caller.
2647  */
2648 int regulator_bulk_get(struct device *dev, int num_consumers,
2649                        struct regulator_bulk_data *consumers)
2650 {
2651         int i;
2652         int ret;
2653
2654         for (i = 0; i < num_consumers; i++)
2655                 consumers[i].consumer = NULL;
2656
2657         for (i = 0; i < num_consumers; i++) {
2658                 consumers[i].consumer = regulator_get(dev,
2659                                                       consumers[i].supply);
2660                 if (IS_ERR(consumers[i].consumer)) {
2661                         ret = PTR_ERR(consumers[i].consumer);
2662                         dev_err(dev, "Failed to get supply '%s': %d\n",
2663                                 consumers[i].supply, ret);
2664                         consumers[i].consumer = NULL;
2665                         goto err;
2666                 }
2667         }
2668
2669         return 0;
2670
2671 err:
2672         while (--i >= 0)
2673                 regulator_put(consumers[i].consumer);
2674
2675         return ret;
2676 }
2677 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2678
2679 /**
2680  * devm_regulator_bulk_get - managed get multiple regulator consumers
2681  *
2682  * @dev:           Device to supply
2683  * @num_consumers: Number of consumers to register
2684  * @consumers:     Configuration of consumers; clients are stored here.
2685  *
2686  * @return 0 on success, an errno on failure.
2687  *
2688  * This helper function allows drivers to get several regulator
2689  * consumers in one operation with management, the regulators will
2690  * automatically be freed when the device is unbound.  If any of the
2691  * regulators cannot be acquired then any regulators that were
2692  * allocated will be freed before returning to the caller.
2693  */
2694 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2695                             struct regulator_bulk_data *consumers)
2696 {
2697         int i;
2698         int ret;
2699
2700         for (i = 0; i < num_consumers; i++)
2701                 consumers[i].consumer = NULL;
2702
2703         for (i = 0; i < num_consumers; i++) {
2704                 consumers[i].consumer = devm_regulator_get(dev,
2705                                                            consumers[i].supply);
2706                 if (IS_ERR(consumers[i].consumer)) {
2707                         ret = PTR_ERR(consumers[i].consumer);
2708                         dev_err(dev, "Failed to get supply '%s': %d\n",
2709                                 consumers[i].supply, ret);
2710                         consumers[i].consumer = NULL;
2711                         goto err;
2712                 }
2713         }
2714
2715         return 0;
2716
2717 err:
2718         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2719                 devm_regulator_put(consumers[i].consumer);
2720
2721         return ret;
2722 }
2723 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2724
2725 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2726 {
2727         struct regulator_bulk_data *bulk = data;
2728
2729         bulk->ret = regulator_enable(bulk->consumer);
2730 }
2731
2732 /**
2733  * regulator_bulk_enable - enable multiple regulator consumers
2734  *
2735  * @num_consumers: Number of consumers
2736  * @consumers:     Consumer data; clients are stored here.
2737  * @return         0 on success, an errno on failure
2738  *
2739  * This convenience API allows consumers to enable multiple regulator
2740  * clients in a single API call.  If any consumers cannot be enabled
2741  * then any others that were enabled will be disabled again prior to
2742  * return.
2743  */
2744 int regulator_bulk_enable(int num_consumers,
2745                           struct regulator_bulk_data *consumers)
2746 {
2747         LIST_HEAD(async_domain);
2748         int i;
2749         int ret = 0;
2750
2751         for (i = 0; i < num_consumers; i++) {
2752                 if (consumers[i].consumer->always_on)
2753                         consumers[i].ret = 0;
2754                 else
2755                         async_schedule_domain(regulator_bulk_enable_async,
2756                                               &consumers[i], &async_domain);
2757         }
2758
2759         async_synchronize_full_domain(&async_domain);
2760
2761         /* If any consumer failed we need to unwind any that succeeded */
2762         for (i = 0; i < num_consumers; i++) {
2763                 if (consumers[i].ret != 0) {
2764                         ret = consumers[i].ret;
2765                         goto err;
2766                 }
2767         }
2768
2769         return 0;
2770
2771 err:
2772         pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2773         while (--i >= 0)
2774                 regulator_disable(consumers[i].consumer);
2775
2776         return ret;
2777 }
2778 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2779
2780 /**
2781  * regulator_bulk_disable - disable multiple regulator consumers
2782  *
2783  * @num_consumers: Number of consumers
2784  * @consumers:     Consumer data; clients are stored here.
2785  * @return         0 on success, an errno on failure
2786  *
2787  * This convenience API allows consumers to disable multiple regulator
2788  * clients in a single API call.  If any consumers cannot be disabled
2789  * then any others that were disabled will be enabled again prior to
2790  * return.
2791  */
2792 int regulator_bulk_disable(int num_consumers,
2793                            struct regulator_bulk_data *consumers)
2794 {
2795         int i;
2796         int ret, r;
2797
2798         for (i = num_consumers - 1; i >= 0; --i) {
2799                 ret = regulator_disable(consumers[i].consumer);
2800                 if (ret != 0)
2801                         goto err;
2802         }
2803
2804         return 0;
2805
2806 err:
2807         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
2808         for (++i; i < num_consumers; ++i) {
2809                 r = regulator_enable(consumers[i].consumer);
2810                 if (r != 0)
2811                         pr_err("Failed to reename %s: %d\n",
2812                                consumers[i].supply, r);
2813         }
2814
2815         return ret;
2816 }
2817 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2818
2819 /**
2820  * regulator_bulk_force_disable - force disable multiple regulator consumers
2821  *
2822  * @num_consumers: Number of consumers
2823  * @consumers:     Consumer data; clients are stored here.
2824  * @return         0 on success, an errno on failure
2825  *
2826  * This convenience API allows consumers to forcibly disable multiple regulator
2827  * clients in a single API call.
2828  * NOTE: This should be used for situations when device damage will
2829  * likely occur if the regulators are not disabled (e.g. over temp).
2830  * Although regulator_force_disable function call for some consumers can
2831  * return error numbers, the function is called for all consumers.
2832  */
2833 int regulator_bulk_force_disable(int num_consumers,
2834                            struct regulator_bulk_data *consumers)
2835 {
2836         int i;
2837         int ret;
2838
2839         for (i = 0; i < num_consumers; i++)
2840                 consumers[i].ret =
2841                             regulator_force_disable(consumers[i].consumer);
2842
2843         for (i = 0; i < num_consumers; i++) {
2844                 if (consumers[i].ret != 0) {
2845                         ret = consumers[i].ret;
2846                         goto out;
2847                 }
2848         }
2849
2850         return 0;
2851 out:
2852         return ret;
2853 }
2854 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2855
2856 /**
2857  * regulator_bulk_free - free multiple regulator consumers
2858  *
2859  * @num_consumers: Number of consumers
2860  * @consumers:     Consumer data; clients are stored here.
2861  *
2862  * This convenience API allows consumers to free multiple regulator
2863  * clients in a single API call.
2864  */
2865 void regulator_bulk_free(int num_consumers,
2866                          struct regulator_bulk_data *consumers)
2867 {
2868         int i;
2869
2870         for (i = 0; i < num_consumers; i++) {
2871                 regulator_put(consumers[i].consumer);
2872                 consumers[i].consumer = NULL;
2873         }
2874 }
2875 EXPORT_SYMBOL_GPL(regulator_bulk_free);
2876
2877 /**
2878  * regulator_notifier_call_chain - call regulator event notifier
2879  * @rdev: regulator source
2880  * @event: notifier block
2881  * @data: callback-specific data.
2882  *
2883  * Called by regulator drivers to notify clients a regulator event has
2884  * occurred. We also notify regulator clients downstream.
2885  * Note lock must be held by caller.
2886  */
2887 int regulator_notifier_call_chain(struct regulator_dev *rdev,
2888                                   unsigned long event, void *data)
2889 {
2890         _notifier_call_chain(rdev, event, data);
2891         return NOTIFY_DONE;
2892
2893 }
2894 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2895
2896 /**
2897  * regulator_mode_to_status - convert a regulator mode into a status
2898  *
2899  * @mode: Mode to convert
2900  *
2901  * Convert a regulator mode into a status.
2902  */
2903 int regulator_mode_to_status(unsigned int mode)
2904 {
2905         switch (mode) {
2906         case REGULATOR_MODE_FAST:
2907                 return REGULATOR_STATUS_FAST;
2908         case REGULATOR_MODE_NORMAL:
2909                 return REGULATOR_STATUS_NORMAL;
2910         case REGULATOR_MODE_IDLE:
2911                 return REGULATOR_STATUS_IDLE;
2912         case REGULATOR_STATUS_STANDBY:
2913                 return REGULATOR_STATUS_STANDBY;
2914         default:
2915                 return 0;
2916         }
2917 }
2918 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2919
2920 /*
2921  * To avoid cluttering sysfs (and memory) with useless state, only
2922  * create attributes that can be meaningfully displayed.
2923  */
2924 static int add_regulator_attributes(struct regulator_dev *rdev)
2925 {
2926         struct device           *dev = &rdev->dev;
2927         struct regulator_ops    *ops = rdev->desc->ops;
2928         int                     status = 0;
2929
2930         /* some attributes need specific methods to be displayed */
2931         if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
2932             (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
2933                 status = device_create_file(dev, &dev_attr_microvolts);
2934                 if (status < 0)
2935                         return status;
2936         }
2937         if (ops->get_current_limit) {
2938                 status = device_create_file(dev, &dev_attr_microamps);
2939                 if (status < 0)
2940                         return status;
2941         }
2942         if (ops->get_mode) {
2943                 status = device_create_file(dev, &dev_attr_opmode);
2944                 if (status < 0)
2945                         return status;
2946         }
2947         if (ops->is_enabled) {
2948                 status = device_create_file(dev, &dev_attr_state);
2949                 if (status < 0)
2950                         return status;
2951         }
2952         if (ops->get_status) {
2953                 status = device_create_file(dev, &dev_attr_status);
2954                 if (status < 0)
2955                         return status;
2956         }
2957
2958         /* some attributes are type-specific */
2959         if (rdev->desc->type == REGULATOR_CURRENT) {
2960                 status = device_create_file(dev, &dev_attr_requested_microamps);
2961                 if (status < 0)
2962                         return status;
2963         }
2964
2965         /* all the other attributes exist to support constraints;
2966          * don't show them if there are no constraints, or if the
2967          * relevant supporting methods are missing.
2968          */
2969         if (!rdev->constraints)
2970                 return status;
2971
2972         /* constraints need specific supporting methods */
2973         if (ops->set_voltage || ops->set_voltage_sel) {
2974                 status = device_create_file(dev, &dev_attr_min_microvolts);
2975                 if (status < 0)
2976                         return status;
2977                 status = device_create_file(dev, &dev_attr_max_microvolts);
2978                 if (status < 0)
2979                         return status;
2980         }
2981         if (ops->set_current_limit) {
2982                 status = device_create_file(dev, &dev_attr_min_microamps);
2983                 if (status < 0)
2984                         return status;
2985                 status = device_create_file(dev, &dev_attr_max_microamps);
2986                 if (status < 0)
2987                         return status;
2988         }
2989
2990         status = device_create_file(dev, &dev_attr_suspend_standby_state);
2991         if (status < 0)
2992                 return status;
2993         status = device_create_file(dev, &dev_attr_suspend_mem_state);
2994         if (status < 0)
2995                 return status;
2996         status = device_create_file(dev, &dev_attr_suspend_disk_state);
2997         if (status < 0)
2998                 return status;
2999
3000         if (ops->set_suspend_voltage) {
3001                 status = device_create_file(dev,
3002                                 &dev_attr_suspend_standby_microvolts);
3003                 if (status < 0)
3004                         return status;
3005                 status = device_create_file(dev,
3006                                 &dev_attr_suspend_mem_microvolts);
3007                 if (status < 0)
3008                         return status;
3009                 status = device_create_file(dev,
3010                                 &dev_attr_suspend_disk_microvolts);
3011                 if (status < 0)
3012                         return status;
3013         }
3014
3015         if (ops->set_suspend_mode) {
3016                 status = device_create_file(dev,
3017                                 &dev_attr_suspend_standby_mode);
3018                 if (status < 0)
3019                         return status;
3020                 status = device_create_file(dev,
3021                                 &dev_attr_suspend_mem_mode);
3022                 if (status < 0)
3023                         return status;
3024                 status = device_create_file(dev,
3025                                 &dev_attr_suspend_disk_mode);
3026                 if (status < 0)
3027                         return status;
3028         }
3029
3030         return status;
3031 }
3032
3033 static void rdev_init_debugfs(struct regulator_dev *rdev)
3034 {
3035         rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3036         if (!rdev->debugfs) {
3037                 rdev_warn(rdev, "Failed to create debugfs directory\n");
3038                 return;
3039         }
3040
3041         debugfs_create_u32("use_count", 0444, rdev->debugfs,
3042                            &rdev->use_count);
3043         debugfs_create_u32("open_count", 0444, rdev->debugfs,
3044                            &rdev->open_count);
3045 }
3046
3047 /**
3048  * regulator_register - register regulator
3049  * @regulator_desc: regulator to register
3050  * @config: runtime configuration for regulator
3051  *
3052  * Called by regulator drivers to register a regulator.
3053  * Returns 0 on success.
3054  */
3055 struct regulator_dev *
3056 regulator_register(const struct regulator_desc *regulator_desc,
3057                    const struct regulator_config *config)
3058 {
3059         const struct regulation_constraints *constraints = NULL;
3060         const struct regulator_init_data *init_data;
3061         static atomic_t regulator_no = ATOMIC_INIT(0);
3062         struct regulator_dev *rdev;
3063         struct device *dev;
3064         int ret, i;
3065         const char *supply = NULL;
3066
3067         if (regulator_desc == NULL || config == NULL)
3068                 return ERR_PTR(-EINVAL);
3069
3070         dev = config->dev;
3071         WARN_ON(!dev);
3072
3073         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3074                 return ERR_PTR(-EINVAL);
3075
3076         if (regulator_desc->type != REGULATOR_VOLTAGE &&
3077             regulator_desc->type != REGULATOR_CURRENT)
3078                 return ERR_PTR(-EINVAL);
3079
3080         /* Only one of each should be implemented */
3081         WARN_ON(regulator_desc->ops->get_voltage &&
3082                 regulator_desc->ops->get_voltage_sel);
3083         WARN_ON(regulator_desc->ops->set_voltage &&
3084                 regulator_desc->ops->set_voltage_sel);
3085
3086         /* If we're using selectors we must implement list_voltage. */
3087         if (regulator_desc->ops->get_voltage_sel &&
3088             !regulator_desc->ops->list_voltage) {
3089                 return ERR_PTR(-EINVAL);
3090         }
3091         if (regulator_desc->ops->set_voltage_sel &&
3092             !regulator_desc->ops->list_voltage) {
3093                 return ERR_PTR(-EINVAL);
3094         }
3095
3096         init_data = config->init_data;
3097
3098         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3099         if (rdev == NULL)
3100                 return ERR_PTR(-ENOMEM);
3101
3102         mutex_lock(&regulator_list_mutex);
3103
3104         mutex_init(&rdev->mutex);
3105         rdev->reg_data = config->driver_data;
3106         rdev->owner = regulator_desc->owner;
3107         rdev->desc = regulator_desc;
3108         rdev->regmap = config->regmap;
3109         INIT_LIST_HEAD(&rdev->consumer_list);
3110         INIT_LIST_HEAD(&rdev->list);
3111         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3112         INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3113
3114         /* preform any regulator specific init */
3115         if (init_data && init_data->regulator_init) {
3116                 ret = init_data->regulator_init(rdev->reg_data);
3117                 if (ret < 0)
3118                         goto clean;
3119         }
3120
3121         /* register with sysfs */
3122         rdev->dev.class = &regulator_class;
3123         rdev->dev.of_node = config->of_node;
3124         rdev->dev.parent = dev;
3125         dev_set_name(&rdev->dev, "regulator.%d",
3126                      atomic_inc_return(&regulator_no) - 1);
3127         ret = device_register(&rdev->dev);
3128         if (ret != 0) {
3129                 put_device(&rdev->dev);
3130                 goto clean;
3131         }
3132
3133         dev_set_drvdata(&rdev->dev, rdev);
3134
3135         /* set regulator constraints */
3136         if (init_data)
3137                 constraints = &init_data->constraints;
3138
3139         ret = set_machine_constraints(rdev, constraints);
3140         if (ret < 0)
3141                 goto scrub;
3142
3143         /* add attributes supported by this regulator */
3144         ret = add_regulator_attributes(rdev);
3145         if (ret < 0)
3146                 goto scrub;
3147
3148         if (init_data && init_data->supply_regulator)
3149                 supply = init_data->supply_regulator;
3150         else if (regulator_desc->supply_name)
3151                 supply = regulator_desc->supply_name;
3152
3153         if (supply) {
3154                 struct regulator_dev *r;
3155
3156                 r = regulator_dev_lookup(dev, supply, &ret);
3157
3158                 if (!r) {
3159                         dev_err(dev, "Failed to find supply %s\n", supply);
3160                         ret = -EPROBE_DEFER;
3161                         goto scrub;
3162                 }
3163
3164                 ret = set_supply(rdev, r);
3165                 if (ret < 0)
3166                         goto scrub;
3167
3168                 /* Enable supply if rail is enabled */
3169                 if (_regulator_is_enabled(rdev)) {
3170                         ret = regulator_enable(rdev->supply);
3171                         if (ret < 0)
3172                                 goto scrub;
3173                 }
3174         }
3175
3176         /* add consumers devices */
3177         if (init_data) {
3178                 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3179                         ret = set_consumer_device_supply(rdev,
3180                                 init_data->consumer_supplies[i].dev_name,
3181                                 init_data->consumer_supplies[i].supply);
3182                         if (ret < 0) {
3183                                 dev_err(dev, "Failed to set supply %s\n",
3184                                         init_data->consumer_supplies[i].supply);
3185                                 goto unset_supplies;
3186                         }
3187                 }
3188         }
3189
3190         list_add(&rdev->list, &regulator_list);
3191
3192         rdev_init_debugfs(rdev);
3193 out:
3194         mutex_unlock(&regulator_list_mutex);
3195         return rdev;
3196
3197 unset_supplies:
3198         unset_regulator_supplies(rdev);
3199
3200 scrub:
3201         if (rdev->supply)
3202                 regulator_put(rdev->supply);
3203         kfree(rdev->constraints);
3204         device_unregister(&rdev->dev);
3205         /* device core frees rdev */
3206         rdev = ERR_PTR(ret);
3207         goto out;
3208
3209 clean:
3210         kfree(rdev);
3211         rdev = ERR_PTR(ret);
3212         goto out;
3213 }
3214 EXPORT_SYMBOL_GPL(regulator_register);
3215
3216 /**
3217  * regulator_unregister - unregister regulator
3218  * @rdev: regulator to unregister
3219  *
3220  * Called by regulator drivers to unregister a regulator.
3221  */
3222 void regulator_unregister(struct regulator_dev *rdev)
3223 {
3224         if (rdev == NULL)
3225                 return;
3226
3227         if (rdev->supply)
3228                 regulator_put(rdev->supply);
3229         mutex_lock(&regulator_list_mutex);
3230         debugfs_remove_recursive(rdev->debugfs);
3231         flush_work_sync(&rdev->disable_work.work);
3232         WARN_ON(rdev->open_count);
3233         unset_regulator_supplies(rdev);
3234         list_del(&rdev->list);
3235         kfree(rdev->constraints);
3236         device_unregister(&rdev->dev);
3237         mutex_unlock(&regulator_list_mutex);
3238 }
3239 EXPORT_SYMBOL_GPL(regulator_unregister);
3240
3241 /**
3242  * regulator_suspend_prepare - prepare regulators for system wide suspend
3243  * @state: system suspend state
3244  *
3245  * Configure each regulator with it's suspend operating parameters for state.
3246  * This will usually be called by machine suspend code prior to supending.
3247  */
3248 int regulator_suspend_prepare(suspend_state_t state)
3249 {
3250         struct regulator_dev *rdev;
3251         int ret = 0;
3252
3253         /* ON is handled by regulator active state */
3254         if (state == PM_SUSPEND_ON)
3255                 return -EINVAL;
3256
3257         mutex_lock(&regulator_list_mutex);
3258         list_for_each_entry(rdev, &regulator_list, list) {
3259
3260                 mutex_lock(&rdev->mutex);
3261                 ret = suspend_prepare(rdev, state);
3262                 mutex_unlock(&rdev->mutex);
3263
3264                 if (ret < 0) {
3265                         rdev_err(rdev, "failed to prepare\n");
3266                         goto out;
3267                 }
3268         }
3269 out:
3270         mutex_unlock(&regulator_list_mutex);
3271         return ret;
3272 }
3273 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3274
3275 /**
3276  * regulator_suspend_finish - resume regulators from system wide suspend
3277  *
3278  * Turn on regulators that might be turned off by regulator_suspend_prepare
3279  * and that should be turned on according to the regulators properties.
3280  */
3281 int regulator_suspend_finish(void)
3282 {
3283         struct regulator_dev *rdev;
3284         int ret = 0, error;
3285
3286         mutex_lock(&regulator_list_mutex);
3287         list_for_each_entry(rdev, &regulator_list, list) {
3288                 struct regulator_ops *ops = rdev->desc->ops;
3289
3290                 mutex_lock(&rdev->mutex);
3291                 if ((rdev->use_count > 0  || rdev->constraints->always_on) &&
3292                                 ops->enable) {
3293                         error = ops->enable(rdev);
3294                         if (error)
3295                                 ret = error;
3296                 } else {
3297                         if (!has_full_constraints)
3298                                 goto unlock;
3299                         if (!ops->disable)
3300                                 goto unlock;
3301                         if (!_regulator_is_enabled(rdev))
3302                                 goto unlock;
3303
3304                         error = ops->disable(rdev);
3305                         if (error)
3306                                 ret = error;
3307                 }
3308 unlock:
3309                 mutex_unlock(&rdev->mutex);
3310         }
3311         mutex_unlock(&regulator_list_mutex);
3312         return ret;
3313 }
3314 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3315
3316 /**
3317  * regulator_has_full_constraints - the system has fully specified constraints
3318  *
3319  * Calling this function will cause the regulator API to disable all
3320  * regulators which have a zero use count and don't have an always_on
3321  * constraint in a late_initcall.
3322  *
3323  * The intention is that this will become the default behaviour in a
3324  * future kernel release so users are encouraged to use this facility
3325  * now.
3326  */
3327 void regulator_has_full_constraints(void)
3328 {
3329         has_full_constraints = 1;
3330 }
3331 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3332
3333 /**
3334  * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3335  *
3336  * Calling this function will cause the regulator API to provide a
3337  * dummy regulator to consumers if no physical regulator is found,
3338  * allowing most consumers to proceed as though a regulator were
3339  * configured.  This allows systems such as those with software
3340  * controllable regulators for the CPU core only to be brought up more
3341  * readily.
3342  */
3343 void regulator_use_dummy_regulator(void)
3344 {
3345         board_wants_dummy_regulator = true;
3346 }
3347 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3348
3349 /**
3350  * rdev_get_drvdata - get rdev regulator driver data
3351  * @rdev: regulator
3352  *
3353  * Get rdev regulator driver private data. This call can be used in the
3354  * regulator driver context.
3355  */
3356 void *rdev_get_drvdata(struct regulator_dev *rdev)
3357 {
3358         return rdev->reg_data;
3359 }
3360 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3361
3362 /**
3363  * regulator_get_drvdata - get regulator driver data
3364  * @regulator: regulator
3365  *
3366  * Get regulator driver private data. This call can be used in the consumer
3367  * driver context when non API regulator specific functions need to be called.
3368  */
3369 void *regulator_get_drvdata(struct regulator *regulator)
3370 {
3371         return regulator->rdev->reg_data;
3372 }
3373 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3374
3375 /**
3376  * regulator_set_drvdata - set regulator driver data
3377  * @regulator: regulator
3378  * @data: data
3379  */
3380 void regulator_set_drvdata(struct regulator *regulator, void *data)
3381 {
3382         regulator->rdev->reg_data = data;
3383 }
3384 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3385
3386 /**
3387  * regulator_get_id - get regulator ID
3388  * @rdev: regulator
3389  */
3390 int rdev_get_id(struct regulator_dev *rdev)
3391 {
3392         return rdev->desc->id;
3393 }
3394 EXPORT_SYMBOL_GPL(rdev_get_id);
3395
3396 struct device *rdev_get_dev(struct regulator_dev *rdev)
3397 {
3398         return &rdev->dev;
3399 }
3400 EXPORT_SYMBOL_GPL(rdev_get_dev);
3401
3402 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3403 {
3404         return reg_init_data->driver_data;
3405 }
3406 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3407
3408 #ifdef CONFIG_DEBUG_FS
3409 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3410                                     size_t count, loff_t *ppos)
3411 {
3412         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3413         ssize_t len, ret = 0;
3414         struct regulator_map *map;
3415
3416         if (!buf)
3417                 return -ENOMEM;
3418
3419         list_for_each_entry(map, &regulator_map_list, list) {
3420                 len = snprintf(buf + ret, PAGE_SIZE - ret,
3421                                "%s -> %s.%s\n",
3422                                rdev_get_name(map->regulator), map->dev_name,
3423                                map->supply);
3424                 if (len >= 0)
3425                         ret += len;
3426                 if (ret > PAGE_SIZE) {
3427                         ret = PAGE_SIZE;
3428                         break;
3429                 }
3430         }
3431
3432         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3433
3434         kfree(buf);
3435
3436         return ret;
3437 }
3438 #endif
3439
3440 static const struct file_operations supply_map_fops = {
3441 #ifdef CONFIG_DEBUG_FS
3442         .read = supply_map_read_file,
3443         .llseek = default_llseek,
3444 #endif
3445 };
3446
3447 static int __init regulator_init(void)
3448 {
3449         int ret;
3450
3451         ret = class_register(&regulator_class);
3452
3453         debugfs_root = debugfs_create_dir("regulator", NULL);
3454         if (!debugfs_root)
3455                 pr_warn("regulator: Failed to create debugfs directory\n");
3456
3457         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3458                             &supply_map_fops);
3459
3460         regulator_dummy_init();
3461
3462         return ret;
3463 }
3464
3465 /* init early to allow our consumers to complete system booting */
3466 core_initcall(regulator_init);
3467
3468 static int __init regulator_init_complete(void)
3469 {
3470         struct regulator_dev *rdev;
3471         struct regulator_ops *ops;
3472         struct regulation_constraints *c;
3473         int enabled, ret;
3474
3475         mutex_lock(&regulator_list_mutex);
3476
3477         /* If we have a full configuration then disable any regulators
3478          * which are not in use or always_on.  This will become the
3479          * default behaviour in the future.
3480          */
3481         list_for_each_entry(rdev, &regulator_list, list) {
3482                 ops = rdev->desc->ops;
3483                 c = rdev->constraints;
3484
3485                 if (!ops->disable || (c && c->always_on))
3486                         continue;
3487
3488                 mutex_lock(&rdev->mutex);
3489
3490                 if (rdev->use_count)
3491                         goto unlock;
3492
3493                 /* If we can't read the status assume it's on. */
3494                 if (ops->is_enabled)
3495                         enabled = ops->is_enabled(rdev);
3496                 else
3497                         enabled = 1;
3498
3499                 if (!enabled)
3500                         goto unlock;
3501
3502                 if (has_full_constraints) {
3503                         /* We log since this may kill the system if it
3504                          * goes wrong. */
3505                         rdev_info(rdev, "disabling\n");
3506                         ret = ops->disable(rdev);
3507                         if (ret != 0) {
3508                                 rdev_err(rdev, "couldn't disable: %d\n", ret);
3509                         }
3510                 } else {
3511                         /* The intention is that in future we will
3512                          * assume that full constraints are provided
3513                          * so warn even if we aren't going to do
3514                          * anything here.
3515                          */
3516                         rdev_warn(rdev, "incomplete constraints, leaving on\n");
3517                 }
3518
3519 unlock:
3520                 mutex_unlock(&rdev->mutex);
3521         }
3522
3523         mutex_unlock(&regulator_list_mutex);
3524
3525         return 0;
3526 }
3527 late_initcall(regulator_init_complete);