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/gpio.h>
  27 #include <linux/of.h>
  28 #include <linux/regmap.h>
  29 #include <linux/regulator/of_regulator.h>
  30 #include <linux/regulator/consumer.h>
  31 #include <linux/regulator/driver.h>
  32 #include <linux/regulator/machine.h>
  33 #include <linux/module.h>
  34
  35 #define CREATE_TRACE_POINTS
  36 #include <trace/events/regulator.h>
  37
  38 #include "dummy.h"
  39
  40 #define rdev_crit(rdev, fmt, ...)                                       \
  41         pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  42 #define rdev_err(rdev, fmt, ...)                                        \
  43         pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  44 #define rdev_warn(rdev, fmt, ...)                                       \
  45         pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  46 #define rdev_info(rdev, fmt, ...)                                       \
  47         pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  48 #define rdev_dbg(rdev, fmt, ...)                                        \
  49         pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  50
  51 static DEFINE_MUTEX(regulator_list_mutex);
  52 static LIST_HEAD(regulator_list);
  53 static LIST_HEAD(regulator_map_list);
  54 static bool has_full_constraints;
  55 static bool board_wants_dummy_regulator;
  56
  57 static struct dentry *debugfs_root;
  58
  59 /*
  60  * struct regulator_map
  61  *
  62  * Used to provide symbolic supply names to devices.
  63  */
  64 struct regulator_map {
  65         struct list_head list;
  66         const char *dev_name;   /* The dev_name() for the consumer */
  67         const char *supply;
  68         struct regulator_dev *regulator;
  69 };
  70
  71 /*
  72  * struct regulator
  73  *
  74  * One for each consumer device.
  75  */
  76 struct regulator {
  77         struct device *dev;
  78         struct list_head list;
  79         unsigned int always_on:1;
  80         unsigned int bypass:1;
  81         int uA_load;
  82         int min_uV;
  83         int max_uV;
  84         char *supply_name;
  85         struct device_attribute dev_attr;
  86         struct regulator_dev *rdev;
  87         struct dentry *debugfs;
  88 };
  89
  90 static int _regulator_is_enabled(struct regulator_dev *rdev);
  91 static int _regulator_disable(struct regulator_dev *rdev);
  92 static int _regulator_get_voltage(struct regulator_dev *rdev);
  93 static int _regulator_get_current_limit(struct regulator_dev *rdev);
  94 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
  95 static void _notifier_call_chain(struct regulator_dev *rdev,
  96                                   unsigned long event, void *data);
  97 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
  98                                      int min_uV, int max_uV);
  99 static struct regulator *create_regulator(struct regulator_dev *rdev,
 100                                           struct device *dev,
 101                                           const char *supply_name);
 102
 103 static const char *rdev_get_name(struct regulator_dev *rdev)
 104 {
 105         if (rdev->constraints && rdev->constraints->name)
 106                 return rdev->constraints->name;
 107         else if (rdev->desc->name)
 108                 return rdev->desc->name;
 109         else
 110                 return "";
 111 }
 112
 113 /**
 114  * of_get_regulator - get a regulator device node based on supply name
 115  * @dev: Device pointer for the consumer (of regulator) device
 116  * @supply: regulator supply name
 117  *
 118  * Extract the regulator device node corresponding to the supply name.
 119  * retruns the device node corresponding to the regulator if found, else
 120  * returns NULL.
 121  */
 122 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 123 {
 124         struct device_node *regnode = NULL;
 125         char prop_name[32]; /* 32 is max size of property name */
 126
 127         dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
 128
 129         snprintf(prop_name, 32, "%s-supply", supply);
 130         regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 131
 132         if (!regnode) {
 133                 dev_dbg(dev, "Looking up %s property in node %s failed",
 134                                 prop_name, dev->of_node->full_name);
 135                 return NULL;
 136         }
 137         return regnode;
 138 }
 139
 140 static int _regulator_can_change_status(struct regulator_dev *rdev)
 141 {
 142         if (!rdev->constraints)
 143                 return 0;
 144
 145         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
 146                 return 1;
 147         else
 148                 return 0;
 149 }
 150
 151 /* Platform voltage constraint check */
 152 static int regulator_check_voltage(struct regulator_dev *rdev,
 153                                    int *min_uV, int *max_uV)
 154 {
 155         BUG_ON(*min_uV > *max_uV);
 156
 157         if (!rdev->constraints) {
 158                 rdev_err(rdev, "no constraints\n");
 159                 return -ENODEV;
 160         }
 161         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 162                 rdev_err(rdev, "operation not allowed\n");
 163                 return -EPERM;
 164         }
 165
 166         if (*max_uV > rdev->constraints->max_uV)
 167                 *max_uV = rdev->constraints->max_uV;
 168         if (*min_uV < rdev->constraints->min_uV)
 169                 *min_uV = rdev->constraints->min_uV;
 170
 171         if (*min_uV > *max_uV) {
 172                 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
 173                          *min_uV, *max_uV);
 174                 return -EINVAL;
 175         }
 176
 177         return 0;
 178 }
 179
 180 /* Make sure we select a voltage that suits the needs of all
 181  * regulator consumers
 182  */
 183 static int regulator_check_consumers(struct regulator_dev *rdev,
 184                                      int *min_uV, int *max_uV)
 185 {
 186         struct regulator *regulator;
 187
 188         list_for_each_entry(regulator, &rdev->consumer_list, list) {
 189                 /*
 190                  * Assume consumers that didn't say anything are OK
 191                  * with anything in the constraint range.
 192                  */
 193                 if (!regulator->min_uV && !regulator->max_uV)
 194                         continue;
 195
 196                 if (*max_uV > regulator->max_uV)
 197                         *max_uV = regulator->max_uV;
 198                 if (*min_uV < regulator->min_uV)
 199                         *min_uV = regulator->min_uV;
 200         }
 201
 202         if (*min_uV > *max_uV)
 203                 return -EINVAL;
 204
 205         return 0;
 206 }
 207
 208 /* current constraint check */
 209 static int regulator_check_current_limit(struct regulator_dev *rdev,
 210                                         int *min_uA, int *max_uA)
 211 {
 212         BUG_ON(*min_uA > *max_uA);
 213
 214         if (!rdev->constraints) {
 215                 rdev_err(rdev, "no constraints\n");
 216                 return -ENODEV;
 217         }
 218         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 219                 rdev_err(rdev, "operation not allowed\n");
 220                 return -EPERM;
 221         }
 222
 223         if (*max_uA > rdev->constraints->max_uA)
 224                 *max_uA = rdev->constraints->max_uA;
 225         if (*min_uA < rdev->constraints->min_uA)
 226                 *min_uA = rdev->constraints->min_uA;
 227
 228         if (*min_uA > *max_uA) {
 229                 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
 230                          *min_uA, *max_uA);
 231                 return -EINVAL;
 232         }
 233
 234         return 0;
 235 }
 236
 237 /* operating mode constraint check */
 238 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
 239 {
 240         switch (*mode) {
 241         case REGULATOR_MODE_FAST:
 242         case REGULATOR_MODE_NORMAL:
 243         case REGULATOR_MODE_IDLE:
 244         case REGULATOR_MODE_STANDBY:
 245                 break;
 246         default:
 247                 rdev_err(rdev, "invalid mode %x specified\n", *mode);
 248                 return -EINVAL;
 249         }
 250
 251         if (!rdev->constraints) {
 252                 rdev_err(rdev, "no constraints\n");
 253                 return -ENODEV;
 254         }
 255         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 256                 rdev_err(rdev, "operation not allowed\n");
 257                 return -EPERM;
 258         }
 259
 260         /* The modes are bitmasks, the most power hungry modes having
 261          * the lowest values. If the requested mode isn't supported
 262          * try higher modes. */
 263         while (*mode) {
 264                 if (rdev->constraints->valid_modes_mask & *mode)
 265                         return 0;
 266                 *mode /= 2;
 267         }
 268
 269         return -EINVAL;
 270 }
 271
 272 /* dynamic regulator mode switching constraint check */
 273 static int regulator_check_drms(struct regulator_dev *rdev)
 274 {
 275         if (!rdev->constraints) {
 276                 rdev_err(rdev, "no constraints\n");
 277                 return -ENODEV;
 278         }
 279         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 280                 rdev_err(rdev, "operation not allowed\n");
 281                 return -EPERM;
 282         }
 283         return 0;
 284 }
 285
 286 static ssize_t regulator_uV_show(struct device *dev,
 287                                 struct device_attribute *attr, char *buf)
 288 {
 289         struct regulator_dev *rdev = dev_get_drvdata(dev);
 290         ssize_t ret;
 291
 292         mutex_lock(&rdev->mutex);
 293         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 294         mutex_unlock(&rdev->mutex);
 295
 296         return ret;
 297 }
 298 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 299
 300 static ssize_t regulator_uA_show(struct device *dev,
 301                                 struct device_attribute *attr, char *buf)
 302 {
 303         struct regulator_dev *rdev = dev_get_drvdata(dev);
 304
 305         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 306 }
 307 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 308
 309 static ssize_t regulator_name_show(struct device *dev,
 310                              struct device_attribute *attr, char *buf)
 311 {
 312         struct regulator_dev *rdev = dev_get_drvdata(dev);
 313
 314         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 315 }
 316
 317 static ssize_t regulator_print_opmode(char *buf, int mode)
 318 {
 319         switch (mode) {
 320         case REGULATOR_MODE_FAST:
 321                 return sprintf(buf, "fast\n");
 322         case REGULATOR_MODE_NORMAL:
 323                 return sprintf(buf, "normal\n");
 324         case REGULATOR_MODE_IDLE:
 325                 return sprintf(buf, "idle\n");
 326         case REGULATOR_MODE_STANDBY:
 327                 return sprintf(buf, "standby\n");
 328         }
 329         return sprintf(buf, "unknown\n");
 330 }
 331
 332 static ssize_t regulator_opmode_show(struct device *dev,
 333                                     struct device_attribute *attr, char *buf)
 334 {
 335         struct regulator_dev *rdev = dev_get_drvdata(dev);
 336
 337         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 338 }
 339 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 340
 341 static ssize_t regulator_print_state(char *buf, int state)
 342 {
 343         if (state > 0)
 344                 return sprintf(buf, "enabled\n");
 345         else if (state == 0)
 346                 return sprintf(buf, "disabled\n");
 347         else
 348                 return sprintf(buf, "unknown\n");
 349 }
 350
 351 static ssize_t regulator_state_show(struct device *dev,
 352                                    struct device_attribute *attr, char *buf)
 353 {
 354         struct regulator_dev *rdev = dev_get_drvdata(dev);
 355         ssize_t ret;
 356
 357         mutex_lock(&rdev->mutex);
 358         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 359         mutex_unlock(&rdev->mutex);
 360
 361         return ret;
 362 }
 363 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 364
 365 static ssize_t regulator_status_show(struct device *dev,
 366                                    struct device_attribute *attr, char *buf)
 367 {
 368         struct regulator_dev *rdev = dev_get_drvdata(dev);
 369         int status;
 370         char *label;
 371
 372         status = rdev->desc->ops->get_status(rdev);
 373         if (status < 0)
 374                 return status;
 375
 376         switch (status) {
 377         case REGULATOR_STATUS_OFF:
 378                 label = "off";
 379                 break;
 380         case REGULATOR_STATUS_ON:
 381                 label = "on";
 382                 break;
 383         case REGULATOR_STATUS_ERROR:
 384                 label = "error";
 385                 break;
 386         case REGULATOR_STATUS_FAST:
 387                 label = "fast";
 388                 break;
 389         case REGULATOR_STATUS_NORMAL:
 390                 label = "normal";
 391                 break;
 392         case REGULATOR_STATUS_IDLE:
 393                 label = "idle";
 394                 break;
 395         case REGULATOR_STATUS_STANDBY:
 396                 label = "standby";
 397                 break;
 398         case REGULATOR_STATUS_BYPASS:
 399                 label = "bypass";
 400                 break;
 401         case REGULATOR_STATUS_UNDEFINED:
 402                 label = "undefined";
 403                 break;
 404         default:
 405                 return -ERANGE;
 406         }
 407
 408         return sprintf(buf, "%s\n", label);
 409 }
 410 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 411
 412 static ssize_t regulator_min_uA_show(struct device *dev,
 413                                     struct device_attribute *attr, char *buf)
 414 {
 415         struct regulator_dev *rdev = dev_get_drvdata(dev);
 416
 417         if (!rdev->constraints)
 418                 return sprintf(buf, "constraint not defined\n");
 419
 420         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 421 }
 422 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 423
 424 static ssize_t regulator_max_uA_show(struct device *dev,
 425                                     struct device_attribute *attr, char *buf)
 426 {
 427         struct regulator_dev *rdev = dev_get_drvdata(dev);
 428
 429         if (!rdev->constraints)
 430                 return sprintf(buf, "constraint not defined\n");
 431
 432         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 433 }
 434 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 435
 436 static ssize_t regulator_min_uV_show(struct device *dev,
 437                                     struct device_attribute *attr, char *buf)
 438 {
 439         struct regulator_dev *rdev = dev_get_drvdata(dev);
 440
 441         if (!rdev->constraints)
 442                 return sprintf(buf, "constraint not defined\n");
 443
 444         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 445 }
 446 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 447
 448 static ssize_t regulator_max_uV_show(struct device *dev,
 449                                     struct device_attribute *attr, char *buf)
 450 {
 451         struct regulator_dev *rdev = dev_get_drvdata(dev);
 452
 453         if (!rdev->constraints)
 454                 return sprintf(buf, "constraint not defined\n");
 455
 456         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 457 }
 458 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 459
 460 static ssize_t regulator_total_uA_show(struct device *dev,
 461                                       struct device_attribute *attr, char *buf)
 462 {
 463         struct regulator_dev *rdev = dev_get_drvdata(dev);
 464         struct regulator *regulator;
 465         int uA = 0;
 466
 467         mutex_lock(&rdev->mutex);
 468         list_for_each_entry(regulator, &rdev->consumer_list, list)
 469                 uA += regulator->uA_load;
 470         mutex_unlock(&rdev->mutex);
 471         return sprintf(buf, "%d\n", uA);
 472 }
 473 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 474
 475 static ssize_t regulator_num_users_show(struct device *dev,
 476                                       struct device_attribute *attr, char *buf)
 477 {
 478         struct regulator_dev *rdev = dev_get_drvdata(dev);
 479         return sprintf(buf, "%d\n", rdev->use_count);
 480 }
 481
 482 static ssize_t regulator_type_show(struct device *dev,
 483                                   struct device_attribute *attr, char *buf)
 484 {
 485         struct regulator_dev *rdev = dev_get_drvdata(dev);
 486
 487         switch (rdev->desc->type) {
 488         case REGULATOR_VOLTAGE:
 489                 return sprintf(buf, "voltage\n");
 490         case REGULATOR_CURRENT:
 491                 return sprintf(buf, "current\n");
 492         }
 493         return sprintf(buf, "unknown\n");
 494 }
 495
 496 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 497                                 struct device_attribute *attr, char *buf)
 498 {
 499         struct regulator_dev *rdev = dev_get_drvdata(dev);
 500
 501         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 502 }
 503 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 504                 regulator_suspend_mem_uV_show, NULL);
 505
 506 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 507                                 struct device_attribute *attr, char *buf)
 508 {
 509         struct regulator_dev *rdev = dev_get_drvdata(dev);
 510
 511         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 512 }
 513 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 514                 regulator_suspend_disk_uV_show, NULL);
 515
 516 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 517                                 struct device_attribute *attr, char *buf)
 518 {
 519         struct regulator_dev *rdev = dev_get_drvdata(dev);
 520
 521         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 522 }
 523 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 524                 regulator_suspend_standby_uV_show, NULL);
 525
 526 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 527                                 struct device_attribute *attr, char *buf)
 528 {
 529         struct regulator_dev *rdev = dev_get_drvdata(dev);
 530
 531         return regulator_print_opmode(buf,
 532                 rdev->constraints->state_mem.mode);
 533 }
 534 static DEVICE_ATTR(suspend_mem_mode, 0444,
 535                 regulator_suspend_mem_mode_show, NULL);
 536
 537 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 538                                 struct device_attribute *attr, char *buf)
 539 {
 540         struct regulator_dev *rdev = dev_get_drvdata(dev);
 541
 542         return regulator_print_opmode(buf,
 543                 rdev->constraints->state_disk.mode);
 544 }
 545 static DEVICE_ATTR(suspend_disk_mode, 0444,
 546                 regulator_suspend_disk_mode_show, NULL);
 547
 548 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 549                                 struct device_attribute *attr, char *buf)
 550 {
 551         struct regulator_dev *rdev = dev_get_drvdata(dev);
 552
 553         return regulator_print_opmode(buf,
 554                 rdev->constraints->state_standby.mode);
 555 }
 556 static DEVICE_ATTR(suspend_standby_mode, 0444,
 557                 regulator_suspend_standby_mode_show, NULL);
 558
 559 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 560                                    struct device_attribute *attr, char *buf)
 561 {
 562         struct regulator_dev *rdev = dev_get_drvdata(dev);
 563
 564         return regulator_print_state(buf,
 565                         rdev->constraints->state_mem.enabled);
 566 }
 567 static DEVICE_ATTR(suspend_mem_state, 0444,
 568                 regulator_suspend_mem_state_show, NULL);
 569
 570 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 571                                    struct device_attribute *attr, char *buf)
 572 {
 573         struct regulator_dev *rdev = dev_get_drvdata(dev);
 574
 575         return regulator_print_state(buf,
 576                         rdev->constraints->state_disk.enabled);
 577 }
 578 static DEVICE_ATTR(suspend_disk_state, 0444,
 579                 regulator_suspend_disk_state_show, NULL);
 580
 581 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 582                                    struct device_attribute *attr, char *buf)
 583 {
 584         struct regulator_dev *rdev = dev_get_drvdata(dev);
 585
 586         return regulator_print_state(buf,
 587                         rdev->constraints->state_standby.enabled);
 588 }
 589 static DEVICE_ATTR(suspend_standby_state, 0444,
 590                 regulator_suspend_standby_state_show, NULL);
 591
 592 static ssize_t regulator_bypass_show(struct device *dev,
 593                                      struct device_attribute *attr, char *buf)
 594 {
 595         struct regulator_dev *rdev = dev_get_drvdata(dev);
 596         const char *report;
 597         bool bypass;
 598         int ret;
 599
 600         ret = rdev->desc->ops->get_bypass(rdev, &bypass);
 601
 602         if (ret != 0)
 603                 report = "unknown";
 604         else if (bypass)
 605                 report = "enabled";
 606         else
 607                 report = "disabled";
 608
 609         return sprintf(buf, "%s\n", report);
 610 }
 611 static DEVICE_ATTR(bypass, 0444,
 612                    regulator_bypass_show, NULL);
 613
 614 /*
 615  * These are the only attributes are present for all regulators.
 616  * Other attributes are a function of regulator functionality.
 617  */
 618 static struct device_attribute regulator_dev_attrs[] = {
 619         __ATTR(name, 0444, regulator_name_show, NULL),
 620         __ATTR(num_users, 0444, regulator_num_users_show, NULL),
 621         __ATTR(type, 0444, regulator_type_show, NULL),
 622         __ATTR_NULL,
 623 };
 624
 625 static void regulator_dev_release(struct device *dev)
 626 {
 627         struct regulator_dev *rdev = dev_get_drvdata(dev);
 628         kfree(rdev);
 629 }
 630
 631 static struct class regulator_class = {
 632         .name = "regulator",
 633         .dev_release = regulator_dev_release,
 634         .dev_attrs = regulator_dev_attrs,
 635 };
 636
 637 /* Calculate the new optimum regulator operating mode based on the new total
 638  * consumer load. All locks held by caller */
 639 static void drms_uA_update(struct regulator_dev *rdev)
 640 {
 641         struct regulator *sibling;
 642         int current_uA = 0, output_uV, input_uV, err;
 643         unsigned int mode;
 644
 645         err = regulator_check_drms(rdev);
 646         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 647             (!rdev->desc->ops->get_voltage &&
 648              !rdev->desc->ops->get_voltage_sel) ||
 649             !rdev->desc->ops->set_mode)
 650                 return;
 651
 652         /* get output voltage */
 653         output_uV = _regulator_get_voltage(rdev);
 654         if (output_uV <= 0)
 655                 return;
 656
 657         /* get input voltage */
 658         input_uV = 0;
 659         if (rdev->supply)
 660                 input_uV = regulator_get_voltage(rdev->supply);
 661         if (input_uV <= 0)
 662                 input_uV = rdev->constraints->input_uV;
 663         if (input_uV <= 0)
 664                 return;
 665
 666         /* calc total requested load */
 667         list_for_each_entry(sibling, &rdev->consumer_list, list)
 668                 current_uA += sibling->uA_load;
 669
 670         /* now get the optimum mode for our new total regulator load */
 671         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 672                                                   output_uV, current_uA);
 673
 674         /* check the new mode is allowed */
 675         err = regulator_mode_constrain(rdev, &mode);
 676         if (err == 0)
 677                 rdev->desc->ops->set_mode(rdev, mode);
 678 }
 679
 680 static int suspend_set_state(struct regulator_dev *rdev,
 681         struct regulator_state *rstate)
 682 {
 683         int ret = 0;
 684
 685         /* If we have no suspend mode configration don't set anything;
 686          * only warn if the driver implements set_suspend_voltage or
 687          * set_suspend_mode callback.
 688          */
 689         if (!rstate->enabled && !rstate->disabled) {
 690                 if (rdev->desc->ops->set_suspend_voltage ||
 691                     rdev->desc->ops->set_suspend_mode)
 692                         rdev_warn(rdev, "No configuration\n");
 693                 return 0;
 694         }
 695
 696         if (rstate->enabled && rstate->disabled) {
 697                 rdev_err(rdev, "invalid configuration\n");
 698                 return -EINVAL;
 699         }
 700
 701         if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
 702                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 703         else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
 704                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 705         else /* OK if set_suspend_enable or set_suspend_disable is NULL */
 706                 ret = 0;
 707
 708         if (ret < 0) {
 709                 rdev_err(rdev, "failed to enabled/disable\n");
 710                 return ret;
 711         }
 712
 713         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 714                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 715                 if (ret < 0) {
 716                         rdev_err(rdev, "failed to set voltage\n");
 717                         return ret;
 718                 }
 719         }
 720
 721         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 722                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 723                 if (ret < 0) {
 724                         rdev_err(rdev, "failed to set mode\n");
 725                         return ret;
 726                 }
 727         }
 728         return ret;
 729 }
 730
 731 /* locks held by caller */
 732 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 733 {
 734         if (!rdev->constraints)
 735                 return -EINVAL;
 736
 737         switch (state) {
 738         case PM_SUSPEND_STANDBY:
 739                 return suspend_set_state(rdev,
 740                         &rdev->constraints->state_standby);
 741         case PM_SUSPEND_MEM:
 742                 return suspend_set_state(rdev,
 743                         &rdev->constraints->state_mem);
 744         case PM_SUSPEND_MAX:
 745                 return suspend_set_state(rdev,
 746                         &rdev->constraints->state_disk);
 747         default:
 748                 return -EINVAL;
 749         }
 750 }
 751
 752 static void print_constraints(struct regulator_dev *rdev)
 753 {
 754         struct regulation_constraints *constraints = rdev->constraints;
 755         char buf[80] = "";
 756         int count = 0;
 757         int ret;
 758
 759         if (constraints->min_uV && constraints->max_uV) {
 760                 if (constraints->min_uV == constraints->max_uV)
 761                         count += sprintf(buf + count, "%d mV ",
 762                                          constraints->min_uV / 1000);
 763                 else
 764                         count += sprintf(buf + count, "%d <--> %d mV ",
 765                                          constraints->min_uV / 1000,
 766                                          constraints->max_uV / 1000);
 767         }
 768
 769         if (!constraints->min_uV ||
 770             constraints->min_uV != constraints->max_uV) {
 771                 ret = _regulator_get_voltage(rdev);
 772                 if (ret > 0)
 773                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
 774         }
 775
 776         if (constraints->uV_offset)
 777                 count += sprintf(buf, "%dmV offset ",
 778                                  constraints->uV_offset / 1000);
 779
 780         if (constraints->min_uA && constraints->max_uA) {
 781                 if (constraints->min_uA == constraints->max_uA)
 782                         count += sprintf(buf + count, "%d mA ",
 783                                          constraints->min_uA / 1000);
 784                 else
 785                         count += sprintf(buf + count, "%d <--> %d mA ",
 786                                          constraints->min_uA / 1000,
 787                                          constraints->max_uA / 1000);
 788         }
 789
 790         if (!constraints->min_uA ||
 791             constraints->min_uA != constraints->max_uA) {
 792                 ret = _regulator_get_current_limit(rdev);
 793                 if (ret > 0)
 794                         count += sprintf(buf + count, "at %d mA ", ret / 1000);
 795         }
 796
 797         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 798                 count += sprintf(buf + count, "fast ");
 799         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 800                 count += sprintf(buf + count, "normal ");
 801         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 802                 count += sprintf(buf + count, "idle ");
 803         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 804                 count += sprintf(buf + count, "standby");
 805
 806         if (!count)
 807                 sprintf(buf, "no parameters");
 808
 809         rdev_info(rdev, "%s\n", buf);
 810
 811         if ((constraints->min_uV != constraints->max_uV) &&
 812             !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
 813                 rdev_warn(rdev,
 814                           "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
 815 }
 816
 817 static int machine_constraints_voltage(struct regulator_dev *rdev,
 818         struct regulation_constraints *constraints)
 819 {
 820         struct regulator_ops *ops = rdev->desc->ops;
 821         int ret;
 822
 823         /* do we need to apply the constraint voltage */
 824         if (rdev->constraints->apply_uV &&
 825             rdev->constraints->min_uV == rdev->constraints->max_uV) {
 826                 ret = _regulator_do_set_voltage(rdev,
 827                                                 rdev->constraints->min_uV,
 828                                                 rdev->constraints->max_uV);
 829                 if (ret < 0) {
 830                         rdev_err(rdev, "failed to apply %duV constraint\n",
 831                                  rdev->constraints->min_uV);
 832                         return ret;
 833                 }
 834         }
 835
 836         /* constrain machine-level voltage specs to fit
 837          * the actual range supported by this regulator.
 838          */
 839         if (ops->list_voltage && rdev->desc->n_voltages) {
 840                 int     count = rdev->desc->n_voltages;
 841                 int     i;
 842                 int     min_uV = INT_MAX;
 843                 int     max_uV = INT_MIN;
 844                 int     cmin = constraints->min_uV;
 845                 int     cmax = constraints->max_uV;
 846
 847                 /* it's safe to autoconfigure fixed-voltage supplies
 848                    and the constraints are used by list_voltage. */
 849                 if (count == 1 && !cmin) {
 850                         cmin = 1;
 851                         cmax = INT_MAX;
 852                         constraints->min_uV = cmin;
 853                         constraints->max_uV = cmax;
 854                 }
 855
 856                 /* voltage constraints are optional */
 857                 if ((cmin == 0) && (cmax == 0))
 858                         return 0;
 859
 860                 /* else require explicit machine-level constraints */
 861                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 862                         rdev_err(rdev, "invalid voltage constraints\n");
 863                         return -EINVAL;
 864                 }
 865
 866                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 867                 for (i = 0; i < count; i++) {
 868                         int     value;
 869
 870                         value = ops->list_voltage(rdev, i);
 871                         if (value <= 0)
 872                                 continue;
 873
 874                         /* maybe adjust [min_uV..max_uV] */
 875                         if (value >= cmin && value < min_uV)
 876                                 min_uV = value;
 877                         if (value <= cmax && value > max_uV)
 878                                 max_uV = value;
 879                 }
 880
 881                 /* final: [min_uV..max_uV] valid iff constraints valid */
 882                 if (max_uV < min_uV) {
 883                         rdev_err(rdev, "unsupportable voltage constraints\n");
 884                         return -EINVAL;
 885                 }
 886
 887                 /* use regulator's subset of machine constraints */
 888                 if (constraints->min_uV < min_uV) {
 889                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
 890                                  constraints->min_uV, min_uV);
 891                         constraints->min_uV = min_uV;
 892                 }
 893                 if (constraints->max_uV > max_uV) {
 894                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
 895                                  constraints->max_uV, max_uV);
 896                         constraints->max_uV = max_uV;
 897                 }
 898         }
 899
 900         return 0;
 901 }
 902
 903 /**
 904  * set_machine_constraints - sets regulator constraints
 905  * @rdev: regulator source
 906  * @constraints: constraints to apply
 907  *
 908  * Allows platform initialisation code to define and constrain
 909  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 910  * Constraints *must* be set by platform code in order for some
 911  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 912  * set_mode.
 913  */
 914 static int set_machine_constraints(struct regulator_dev *rdev,
 915         const struct regulation_constraints *constraints)
 916 {
 917         int ret = 0;
 918         struct regulator_ops *ops = rdev->desc->ops;
 919
 920         if (constraints)
 921                 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
 922                                             GFP_KERNEL);
 923         else
 924                 rdev->constraints = kzalloc(sizeof(*constraints),
 925                                             GFP_KERNEL);
 926         if (!rdev->constraints)
 927                 return -ENOMEM;
 928
 929         ret = machine_constraints_voltage(rdev, rdev->constraints);
 930         if (ret != 0)
 931                 goto out;
 932
 933         /* do we need to setup our suspend state */
 934         if (rdev->constraints->initial_state) {
 935                 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
 936                 if (ret < 0) {
 937                         rdev_err(rdev, "failed to set suspend state\n");
 938                         goto out;
 939                 }
 940         }
 941
 942         if (rdev->constraints->initial_mode) {
 943                 if (!ops->set_mode) {
 944                         rdev_err(rdev, "no set_mode operation\n");
 945                         ret = -EINVAL;
 946                         goto out;
 947                 }
 948
 949                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
 950                 if (ret < 0) {
 951                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
 952                         goto out;
 953                 }
 954         }
 955
 956         /* If the constraints say the regulator should be on at this point
 957          * and we have control then make sure it is enabled.
 958          */
 959         if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
 960             ops->enable) {
 961                 ret = ops->enable(rdev);
 962                 if (ret < 0) {
 963                         rdev_err(rdev, "failed to enable\n");
 964                         goto out;
 965                 }
 966         }
 967
 968         if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
 969                 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
 970                 if (ret < 0) {
 971                         rdev_err(rdev, "failed to set ramp_delay\n");
 972                         goto out;
 973                 }
 974         }
 975
 976         print_constraints(rdev);
 977         return 0;
 978 out:
 979         kfree(rdev->constraints);
 980         rdev->constraints = NULL;
 981         return ret;
 982 }
 983
 984 /**
 985  * set_supply - set regulator supply regulator
 986  * @rdev: regulator name
 987  * @supply_rdev: supply regulator name
 988  *
 989  * Called by platform initialisation code to set the supply regulator for this
 990  * regulator. This ensures that a regulators supply will also be enabled by the
 991  * core if it's child is enabled.
 992  */
 993 static int set_supply(struct regulator_dev *rdev,
 994                       struct regulator_dev *supply_rdev)
 995 {
 996         int err;
 997
 998         rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
 999
1000         rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1001         if (rdev->supply == NULL) {
1002                 err = -ENOMEM;
1003                 return err;
1004         }
1005         supply_rdev->open_count++;
1006
1007         return 0;
1008 }
1009
1010 /**
1011  * set_consumer_device_supply - Bind a regulator to a symbolic supply
1012  * @rdev:         regulator source
1013  * @consumer_dev_name: dev_name() string for device supply applies to
1014  * @supply:       symbolic name for supply
1015  *
1016  * Allows platform initialisation code to map physical regulator
1017  * sources to symbolic names for supplies for use by devices.  Devices
1018  * should use these symbolic names to request regulators, avoiding the
1019  * need to provide board-specific regulator names as platform data.
1020  */
1021 static int set_consumer_device_supply(struct regulator_dev *rdev,
1022                                       const char *consumer_dev_name,
1023                                       const char *supply)
1024 {
1025         struct regulator_map *node;
1026         int has_dev;
1027
1028         if (supply == NULL)
1029                 return -EINVAL;
1030
1031         if (consumer_dev_name != NULL)
1032                 has_dev = 1;
1033         else
1034                 has_dev = 0;
1035
1036         list_for_each_entry(node, &regulator_map_list, list) {
1037                 if (node->dev_name && consumer_dev_name) {
1038                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
1039                                 continue;
1040                 } else if (node->dev_name || consumer_dev_name) {
1041                         continue;
1042                 }
1043
1044                 if (strcmp(node->supply, supply) != 0)
1045                         continue;
1046
1047                 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1048                          consumer_dev_name,
1049                          dev_name(&node->regulator->dev),
1050                          node->regulator->desc->name,
1051                          supply,
1052                          dev_name(&rdev->dev), rdev_get_name(rdev));
1053                 return -EBUSY;
1054         }
1055
1056         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1057         if (node == NULL)
1058                 return -ENOMEM;
1059
1060         node->regulator = rdev;
1061         node->supply = supply;
1062
1063         if (has_dev) {
1064                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1065                 if (node->dev_name == NULL) {
1066                         kfree(node);
1067                         return -ENOMEM;
1068                 }
1069         }
1070
1071         list_add(&node->list, &regulator_map_list);
1072         return 0;
1073 }
1074
1075 static void unset_regulator_supplies(struct regulator_dev *rdev)
1076 {
1077         struct regulator_map *node, *n;
1078
1079         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1080                 if (rdev == node->regulator) {
1081                         list_del(&node->list);
1082                         kfree(node->dev_name);
1083                         kfree(node);
1084                 }
1085         }
1086 }
1087
1088 #define REG_STR_SIZE    64
1089
1090 static struct regulator *create_regulator(struct regulator_dev *rdev,
1091                                           struct device *dev,
1092                                           const char *supply_name)
1093 {
1094         struct regulator *regulator;
1095         char buf[REG_STR_SIZE];
1096         int err, size;
1097
1098         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1099         if (regulator == NULL)
1100                 return NULL;
1101
1102         mutex_lock(&rdev->mutex);
1103         regulator->rdev = rdev;
1104         list_add(&regulator->list, &rdev->consumer_list);
1105
1106         if (dev) {
1107                 regulator->dev = dev;
1108
1109                 /* Add a link to the device sysfs entry */
1110                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1111                                  dev->kobj.name, supply_name);
1112                 if (size >= REG_STR_SIZE)
1113                         goto overflow_err;
1114
1115                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1116                 if (regulator->supply_name == NULL)
1117                         goto overflow_err;
1118
1119                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1120                                         buf);
1121                 if (err) {
1122                         rdev_warn(rdev, "could not add device link %s err %d\n",
1123                                   dev->kobj.name, err);
1124                         /* non-fatal */
1125                 }
1126         } else {
1127                 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1128                 if (regulator->supply_name == NULL)
1129                         goto overflow_err;
1130         }
1131
1132         regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1133                                                 rdev->debugfs);
1134         if (!regulator->debugfs) {
1135                 rdev_warn(rdev, "Failed to create debugfs directory\n");
1136         } else {
1137                 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1138                                    &regulator->uA_load);
1139                 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1140                                    &regulator->min_uV);
1141                 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1142                                    &regulator->max_uV);
1143         }
1144
1145         /*
1146          * Check now if the regulator is an always on regulator - if
1147          * it is then we don't need to do nearly so much work for
1148          * enable/disable calls.
1149          */
1150         if (!_regulator_can_change_status(rdev) &&
1151             _regulator_is_enabled(rdev))
1152                 regulator->always_on = true;
1153
1154         mutex_unlock(&rdev->mutex);
1155         return regulator;
1156 overflow_err:
1157         list_del(&regulator->list);
1158         kfree(regulator);
1159         mutex_unlock(&rdev->mutex);
1160         return NULL;
1161 }
1162
1163 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1164 {
1165         if (!rdev->desc->ops->enable_time)
1166                 return rdev->desc->enable_time;
1167         return rdev->desc->ops->enable_time(rdev);
1168 }
1169
1170 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1171                                                   const char *supply,
1172                                                   int *ret)
1173 {
1174         struct regulator_dev *r;
1175         struct device_node *node;
1176         struct regulator_map *map;
1177         const char *devname = NULL;
1178
1179         /* first do a dt based lookup */
1180         if (dev && dev->of_node) {
1181                 node = of_get_regulator(dev, supply);
1182                 if (node) {
1183                         list_for_each_entry(r, &regulator_list, list)
1184                                 if (r->dev.parent &&
1185                                         node == r->dev.of_node)
1186                                         return r;
1187                 } else {
1188                         /*
1189                          * If we couldn't even get the node then it's
1190                          * not just that the device didn't register
1191                          * yet, there's no node and we'll never
1192                          * succeed.
1193                          */
1194                         *ret = -ENODEV;
1195                 }
1196         }
1197
1198         /* if not found, try doing it non-dt way */
1199         if (dev)
1200                 devname = dev_name(dev);
1201
1202         list_for_each_entry(r, &regulator_list, list)
1203                 if (strcmp(rdev_get_name(r), supply) == 0)
1204                         return r;
1205
1206         list_for_each_entry(map, &regulator_map_list, list) {
1207                 /* If the mapping has a device set up it must match */
1208                 if (map->dev_name &&
1209                     (!devname || strcmp(map->dev_name, devname)))
1210                         continue;
1211
1212                 if (strcmp(map->supply, supply) == 0)
1213                         return map->regulator;
1214         }
1215
1216
1217         return NULL;
1218 }
1219
1220 /* Internal regulator request function */
1221 static struct regulator *_regulator_get(struct device *dev, const char *id,
1222                                         int exclusive)
1223 {
1224         struct regulator_dev *rdev;
1225         struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1226         const char *devname = NULL;
1227         int ret;
1228
1229         if (id == NULL) {
1230                 pr_err("get() with no identifier\n");
1231                 return regulator;
1232         }
1233
1234         if (dev)
1235                 devname = dev_name(dev);
1236
1237         mutex_lock(&regulator_list_mutex);
1238
1239         rdev = regulator_dev_lookup(dev, id, &ret);
1240         if (rdev)
1241                 goto found;
1242
1243         if (board_wants_dummy_regulator) {
1244                 rdev = dummy_regulator_rdev;
1245                 goto found;
1246         }
1247
1248 #ifdef CONFIG_REGULATOR_DUMMY
1249         if (!devname)
1250                 devname = "deviceless";
1251
1252         /* If the board didn't flag that it was fully constrained then
1253          * substitute in a dummy regulator so consumers can continue.
1254          */
1255         if (!has_full_constraints) {
1256                 pr_warn("%s supply %s not found, using dummy regulator\n",
1257                         devname, id);
1258                 rdev = dummy_regulator_rdev;
1259                 goto found;
1260         }
1261 #endif
1262
1263         mutex_unlock(&regulator_list_mutex);
1264         return regulator;
1265
1266 found:
1267         if (rdev->exclusive) {
1268                 regulator = ERR_PTR(-EPERM);
1269                 goto out;
1270         }
1271
1272         if (exclusive && rdev->open_count) {
1273                 regulator = ERR_PTR(-EBUSY);
1274                 goto out;
1275         }
1276
1277         if (!try_module_get(rdev->owner))
1278                 goto out;
1279
1280         regulator = create_regulator(rdev, dev, id);
1281         if (regulator == NULL) {
1282                 regulator = ERR_PTR(-ENOMEM);
1283                 module_put(rdev->owner);
1284                 goto out;
1285         }
1286
1287         rdev->open_count++;
1288         if (exclusive) {
1289                 rdev->exclusive = 1;
1290
1291                 ret = _regulator_is_enabled(rdev);
1292                 if (ret > 0)
1293                         rdev->use_count = 1;
1294                 else
1295                         rdev->use_count = 0;
1296         }
1297
1298 out:
1299         mutex_unlock(&regulator_list_mutex);
1300
1301         return regulator;
1302 }
1303
1304 /**
1305  * regulator_get - lookup and obtain a reference to a regulator.
1306  * @dev: device for regulator "consumer"
1307  * @id: Supply name or regulator ID.
1308  *
1309  * Returns a struct regulator corresponding to the regulator producer,
1310  * or IS_ERR() condition containing errno.
1311  *
1312  * Use of supply names configured via regulator_set_device_supply() is
1313  * strongly encouraged.  It is recommended that the supply name used
1314  * should match the name used for the supply and/or the relevant
1315  * device pins in the datasheet.
1316  */
1317 struct regulator *regulator_get(struct device *dev, const char *id)
1318 {
1319         return _regulator_get(dev, id, 0);
1320 }
1321 EXPORT_SYMBOL_GPL(regulator_get);
1322
1323 static void devm_regulator_release(struct device *dev, void *res)
1324 {
1325         regulator_put(*(struct regulator **)res);
1326 }
1327
1328 /**
1329  * devm_regulator_get - Resource managed regulator_get()
1330  * @dev: device for regulator "consumer"
1331  * @id: Supply name or regulator ID.
1332  *
1333  * Managed regulator_get(). Regulators returned from this function are
1334  * automatically regulator_put() on driver detach. See regulator_get() for more
1335  * information.
1336  */
1337 struct regulator *devm_regulator_get(struct device *dev, const char *id)
1338 {
1339         struct regulator **ptr, *regulator;
1340
1341         ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1342         if (!ptr)
1343                 return ERR_PTR(-ENOMEM);
1344
1345         regulator = regulator_get(dev, id);
1346         if (!IS_ERR(regulator)) {
1347                 *ptr = regulator;
1348                 devres_add(dev, ptr);
1349         } else {
1350                 devres_free(ptr);
1351         }
1352
1353         return regulator;
1354 }
1355 EXPORT_SYMBOL_GPL(devm_regulator_get);
1356
1357 /**
1358  * regulator_get_exclusive - obtain exclusive access to a regulator.
1359  * @dev: device for regulator "consumer"
1360  * @id: Supply name or regulator ID.
1361  *
1362  * Returns a struct regulator corresponding to the regulator producer,
1363  * or IS_ERR() condition containing errno.  Other consumers will be
1364  * unable to obtain this reference is held and the use count for the
1365  * regulator will be initialised to reflect the current state of the
1366  * regulator.
1367  *
1368  * This is intended for use by consumers which cannot tolerate shared
1369  * use of the regulator such as those which need to force the
1370  * regulator off for correct operation of the hardware they are
1371  * controlling.
1372  *
1373  * Use of supply names configured via regulator_set_device_supply() is
1374  * strongly encouraged.  It is recommended that the supply name used
1375  * should match the name used for the supply and/or the relevant
1376  * device pins in the datasheet.
1377  */
1378 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1379 {
1380         return _regulator_get(dev, id, 1);
1381 }
1382 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1383
1384 /* Locks held by regulator_put() */
1385 static void _regulator_put(struct regulator *regulator)
1386 {
1387         struct regulator_dev *rdev;
1388
1389         if (regulator == NULL || IS_ERR(regulator))
1390                 return;
1391
1392         rdev = regulator->rdev;
1393
1394         debugfs_remove_recursive(regulator->debugfs);
1395
1396         /* remove any sysfs entries */
1397         if (regulator->dev)
1398                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1399         kfree(regulator->supply_name);
1400         list_del(&regulator->list);
1401         kfree(regulator);
1402
1403         rdev->open_count--;
1404         rdev->exclusive = 0;
1405
1406         module_put(rdev->owner);
1407 }
1408
1409 /**
1410  * regulator_put - "free" the regulator source
1411  * @regulator: regulator source
1412  *
1413  * Note: drivers must ensure that all regulator_enable calls made on this
1414  * regulator source are balanced by regulator_disable calls prior to calling
1415  * this function.
1416  */
1417 void regulator_put(struct regulator *regulator)
1418 {
1419         mutex_lock(&regulator_list_mutex);
1420         _regulator_put(regulator);
1421         mutex_unlock(&regulator_list_mutex);
1422 }
1423 EXPORT_SYMBOL_GPL(regulator_put);
1424
1425 static int devm_regulator_match(struct device *dev, void *res, void *data)
1426 {
1427         struct regulator **r = res;
1428         if (!r || !*r) {
1429                 WARN_ON(!r || !*r);
1430                 return 0;
1431         }
1432         return *r == data;
1433 }
1434
1435 /**
1436  * devm_regulator_put - Resource managed regulator_put()
1437  * @regulator: regulator to free
1438  *
1439  * Deallocate a regulator allocated with devm_regulator_get(). Normally
1440  * this function will not need to be called and the resource management
1441  * code will ensure that the resource is freed.
1442  */
1443 void devm_regulator_put(struct regulator *regulator)
1444 {
1445         int rc;
1446
1447         rc = devres_release(regulator->dev, devm_regulator_release,
1448                             devm_regulator_match, regulator);
1449         if (rc != 0)
1450                 WARN_ON(rc);
1451 }
1452 EXPORT_SYMBOL_GPL(devm_regulator_put);
1453
1454 static int _regulator_do_enable(struct regulator_dev *rdev)
1455 {
1456         int ret, delay;
1457
1458         /* Query before enabling in case configuration dependent.  */
1459         ret = _regulator_get_enable_time(rdev);
1460         if (ret >= 0) {
1461                 delay = ret;
1462         } else {
1463                 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1464                 delay = 0;
1465         }
1466
1467         trace_regulator_enable(rdev_get_name(rdev));
1468
1469         if (rdev->ena_gpio) {
1470                 gpio_set_value_cansleep(rdev->ena_gpio,
1471                                         !rdev->ena_gpio_invert);
1472                 rdev->ena_gpio_state = 1;
1473         } else if (rdev->desc->ops->enable) {
1474                 ret = rdev->desc->ops->enable(rdev);
1475                 if (ret < 0)
1476                         return ret;
1477         } else {
1478                 return -EINVAL;
1479         }
1480
1481         /* Allow the regulator to ramp; it would be useful to extend
1482          * this for bulk operations so that the regulators can ramp
1483          * together.  */
1484         trace_regulator_enable_delay(rdev_get_name(rdev));
1485
1486         if (delay >= 1000) {
1487                 mdelay(delay / 1000);
1488                 udelay(delay % 1000);
1489         } else if (delay) {
1490                 udelay(delay);
1491         }
1492
1493         trace_regulator_enable_complete(rdev_get_name(rdev));
1494
1495         return 0;
1496 }
1497
1498 /* locks held by regulator_enable() */
1499 static int _regulator_enable(struct regulator_dev *rdev)
1500 {
1501         int ret;
1502
1503         /* check voltage and requested load before enabling */
1504         if (rdev->constraints &&
1505             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1506                 drms_uA_update(rdev);
1507
1508         if (rdev->use_count == 0) {
1509                 /* The regulator may on if it's not switchable or left on */
1510                 ret = _regulator_is_enabled(rdev);
1511                 if (ret == -EINVAL || ret == 0) {
1512                         if (!_regulator_can_change_status(rdev))
1513                                 return -EPERM;
1514
1515                         ret = _regulator_do_enable(rdev);
1516                         if (ret < 0)
1517                                 return ret;
1518
1519                 } else if (ret < 0) {
1520                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1521                         return ret;
1522                 }
1523                 /* Fallthrough on positive return values - already enabled */
1524         }
1525
1526         rdev->use_count++;
1527
1528         return 0;
1529 }
1530
1531 /**
1532  * regulator_enable - enable regulator output
1533  * @regulator: regulator source
1534  *
1535  * Request that the regulator be enabled with the regulator output at
1536  * the predefined voltage or current value.  Calls to regulator_enable()
1537  * must be balanced with calls to regulator_disable().
1538  *
1539  * NOTE: the output value can be set by other drivers, boot loader or may be
1540  * hardwired in the regulator.
1541  */
1542 int regulator_enable(struct regulator *regulator)
1543 {
1544         struct regulator_dev *rdev = regulator->rdev;
1545         int ret = 0;
1546
1547         if (regulator->always_on)
1548                 return 0;
1549
1550         if (rdev->supply) {
1551                 ret = regulator_enable(rdev->supply);
1552                 if (ret != 0)
1553                         return ret;
1554         }
1555
1556         mutex_lock(&rdev->mutex);
1557         ret = _regulator_enable(rdev);
1558         mutex_unlock(&rdev->mutex);
1559
1560         if (ret != 0 && rdev->supply)
1561                 regulator_disable(rdev->supply);
1562
1563         return ret;
1564 }
1565 EXPORT_SYMBOL_GPL(regulator_enable);
1566
1567 static int _regulator_do_disable(struct regulator_dev *rdev)
1568 {
1569         int ret;
1570
1571         trace_regulator_disable(rdev_get_name(rdev));
1572
1573         if (rdev->ena_gpio) {
1574                 gpio_set_value_cansleep(rdev->ena_gpio,
1575                                         rdev->ena_gpio_invert);
1576                 rdev->ena_gpio_state = 0;
1577
1578         } else if (rdev->desc->ops->disable) {
1579                 ret = rdev->desc->ops->disable(rdev);
1580                 if (ret != 0)
1581                         return ret;
1582         }
1583
1584         trace_regulator_disable_complete(rdev_get_name(rdev));
1585
1586         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1587                              NULL);
1588         return 0;
1589 }
1590
1591 /* locks held by regulator_disable() */
1592 static int _regulator_disable(struct regulator_dev *rdev)
1593 {
1594         int ret = 0;
1595
1596         if (WARN(rdev->use_count <= 0,
1597                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
1598                 return -EIO;
1599
1600         /* are we the last user and permitted to disable ? */
1601         if (rdev->use_count == 1 &&
1602             (rdev->constraints && !rdev->constraints->always_on)) {
1603
1604                 /* we are last user */
1605                 if (_regulator_can_change_status(rdev)) {
1606                         ret = _regulator_do_disable(rdev);
1607                         if (ret < 0) {
1608                                 rdev_err(rdev, "failed to disable\n");
1609                                 return ret;
1610                         }
1611                 }
1612
1613                 rdev->use_count = 0;
1614         } else if (rdev->use_count > 1) {
1615
1616                 if (rdev->constraints &&
1617                         (rdev->constraints->valid_ops_mask &
1618                         REGULATOR_CHANGE_DRMS))
1619                         drms_uA_update(rdev);
1620
1621                 rdev->use_count--;
1622         }
1623
1624         return ret;
1625 }
1626
1627 /**
1628  * regulator_disable - disable regulator output
1629  * @regulator: regulator source
1630  *
1631  * Disable the regulator output voltage or current.  Calls to
1632  * regulator_enable() must be balanced with calls to
1633  * regulator_disable().
1634  *
1635  * NOTE: this will only disable the regulator output if no other consumer
1636  * devices have it enabled, the regulator device supports disabling and
1637  * machine constraints permit this operation.
1638  */
1639 int regulator_disable(struct regulator *regulator)
1640 {
1641         struct regulator_dev *rdev = regulator->rdev;
1642         int ret = 0;
1643
1644         if (regulator->always_on)
1645                 return 0;
1646
1647         mutex_lock(&rdev->mutex);
1648         ret = _regulator_disable(rdev);
1649         mutex_unlock(&rdev->mutex);
1650
1651         if (ret == 0 && rdev->supply)
1652                 regulator_disable(rdev->supply);
1653
1654         return ret;
1655 }
1656 EXPORT_SYMBOL_GPL(regulator_disable);
1657
1658 /* locks held by regulator_force_disable() */
1659 static int _regulator_force_disable(struct regulator_dev *rdev)
1660 {
1661         int ret = 0;
1662
1663         /* force disable */
1664         if (rdev->desc->ops->disable) {
1665                 /* ah well, who wants to live forever... */
1666                 ret = rdev->desc->ops->disable(rdev);
1667                 if (ret < 0) {
1668                         rdev_err(rdev, "failed to force disable\n");
1669                         return ret;
1670                 }
1671                 /* notify other consumers that power has been forced off */
1672                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1673                         REGULATOR_EVENT_DISABLE, NULL);
1674         }
1675
1676         return ret;
1677 }
1678
1679 /**
1680  * regulator_force_disable - force disable regulator output
1681  * @regulator: regulator source
1682  *
1683  * Forcibly disable the regulator output voltage or current.
1684  * NOTE: this *will* disable the regulator output even if other consumer
1685  * devices have it enabled. This should be used for situations when device
1686  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1687  */
1688 int regulator_force_disable(struct regulator *regulator)
1689 {
1690         struct regulator_dev *rdev = regulator->rdev;
1691         int ret;
1692
1693         mutex_lock(&rdev->mutex);
1694         regulator->uA_load = 0;
1695         ret = _regulator_force_disable(regulator->rdev);
1696         mutex_unlock(&rdev->mutex);
1697
1698         if (rdev->supply)
1699                 while (rdev->open_count--)
1700                         regulator_disable(rdev->supply);
1701
1702         return ret;
1703 }
1704 EXPORT_SYMBOL_GPL(regulator_force_disable);
1705
1706 static void regulator_disable_work(struct work_struct *work)
1707 {
1708         struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1709                                                   disable_work.work);
1710         int count, i, ret;
1711
1712         mutex_lock(&rdev->mutex);
1713
1714         BUG_ON(!rdev->deferred_disables);
1715
1716         count = rdev->deferred_disables;
1717         rdev->deferred_disables = 0;
1718
1719         for (i = 0; i < count; i++) {
1720                 ret = _regulator_disable(rdev);
1721                 if (ret != 0)
1722                         rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1723         }
1724
1725         mutex_unlock(&rdev->mutex);
1726
1727         if (rdev->supply) {
1728                 for (i = 0; i < count; i++) {
1729                         ret = regulator_disable(rdev->supply);
1730                         if (ret != 0) {
1731                                 rdev_err(rdev,
1732                                          "Supply disable failed: %d\n", ret);
1733                         }
1734                 }
1735         }
1736 }
1737
1738 /**
1739  * regulator_disable_deferred - disable regulator output with delay
1740  * @regulator: regulator source
1741  * @ms: miliseconds until the regulator is disabled
1742  *
1743  * Execute regulator_disable() on the regulator after a delay.  This
1744  * is intended for use with devices that require some time to quiesce.
1745  *
1746  * NOTE: this will only disable the regulator output if no other consumer
1747  * devices have it enabled, the regulator device supports disabling and
1748  * machine constraints permit this operation.
1749  */
1750 int regulator_disable_deferred(struct regulator *regulator, int ms)
1751 {
1752         struct regulator_dev *rdev = regulator->rdev;
1753         int ret;
1754
1755         if (regulator->always_on)
1756                 return 0;
1757
1758         if (!ms)
1759                 return regulator_disable(regulator);
1760
1761         mutex_lock(&rdev->mutex);
1762         rdev->deferred_disables++;
1763         mutex_unlock(&rdev->mutex);
1764
1765         ret = schedule_delayed_work(&rdev->disable_work,
1766                                     msecs_to_jiffies(ms));
1767         if (ret < 0)
1768                 return ret;
1769         else
1770                 return 0;
1771 }
1772 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1773
1774 /**
1775  * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1776  *
1777  * @rdev: regulator to operate on
1778  *
1779  * Regulators that use regmap for their register I/O can set the
1780  * enable_reg and enable_mask fields in their descriptor and then use
1781  * this as their is_enabled operation, saving some code.
1782  */
1783 int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1784 {
1785         unsigned int val;
1786         int ret;
1787
1788         ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1789         if (ret != 0)
1790                 return ret;
1791
1792         return (val & rdev->desc->enable_mask) != 0;
1793 }
1794 EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1795
1796 /**
1797  * regulator_enable_regmap - standard enable() for regmap users
1798  *
1799  * @rdev: regulator to operate on
1800  *
1801  * Regulators that use regmap for their register I/O can set the
1802  * enable_reg and enable_mask fields in their descriptor and then use
1803  * this as their enable() operation, saving some code.
1804  */
1805 int regulator_enable_regmap(struct regulator_dev *rdev)
1806 {
1807         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1808                                   rdev->desc->enable_mask,
1809                                   rdev->desc->enable_mask);
1810 }
1811 EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1812
1813 /**
1814  * regulator_disable_regmap - standard disable() for regmap users
1815  *
1816  * @rdev: regulator to operate on
1817  *
1818  * Regulators that use regmap for their register I/O can set the
1819  * enable_reg and enable_mask fields in their descriptor and then use
1820  * this as their disable() operation, saving some code.
1821  */
1822 int regulator_disable_regmap(struct regulator_dev *rdev)
1823 {
1824         return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1825                                   rdev->desc->enable_mask, 0);
1826 }
1827 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1828
1829 static int _regulator_is_enabled(struct regulator_dev *rdev)
1830 {
1831         /* A GPIO control always takes precedence */
1832         if (rdev->ena_gpio)
1833                 return rdev->ena_gpio_state;
1834
1835         /* If we don't know then assume that the regulator is always on */
1836         if (!rdev->desc->ops->is_enabled)
1837                 return 1;
1838
1839         return rdev->desc->ops->is_enabled(rdev);
1840 }
1841
1842 /**
1843  * regulator_is_enabled - is the regulator output enabled
1844  * @regulator: regulator source
1845  *
1846  * Returns positive if the regulator driver backing the source/client
1847  * has requested that the device be enabled, zero if it hasn't, else a
1848  * negative errno code.
1849  *
1850  * Note that the device backing this regulator handle can have multiple
1851  * users, so it might be enabled even if regulator_enable() was never
1852  * called for this particular source.
1853  */
1854 int regulator_is_enabled(struct regulator *regulator)
1855 {
1856         int ret;
1857
1858         if (regulator->always_on)
1859                 return 1;
1860
1861         mutex_lock(&regulator->rdev->mutex);
1862         ret = _regulator_is_enabled(regulator->rdev);
1863         mutex_unlock(&regulator->rdev->mutex);
1864
1865         return ret;
1866 }
1867 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1868
1869 /**
1870  * regulator_can_change_voltage - check if regulator can change voltage
1871  * @regulator: regulator source
1872  *
1873  * Returns positive if the regulator driver backing the source/client
1874  * can change its voltage, false otherwise. Usefull for detecting fixed
1875  * or dummy regulators and disabling voltage change logic in the client
1876  * driver.
1877  */
1878 int regulator_can_change_voltage(struct regulator *regulator)
1879 {
1880         struct regulator_dev    *rdev = regulator->rdev;
1881
1882         if (rdev->constraints &&
1883             rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE &&
1884             rdev->desc->n_voltages > 1)
1885                 return 1;
1886
1887         return 0;
1888 }
1889 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
1890
1891 /**
1892  * regulator_count_voltages - count regulator_list_voltage() selectors
1893  * @regulator: regulator source
1894  *
1895  * Returns number of selectors, or negative errno.  Selectors are
1896  * numbered starting at zero, and typically correspond to bitfields
1897  * in hardware registers.
1898  */
1899 int regulator_count_voltages(struct regulator *regulator)
1900 {
1901         struct regulator_dev    *rdev = regulator->rdev;
1902
1903         return rdev->desc->n_voltages ? : -EINVAL;
1904 }
1905 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1906
1907 /**
1908  * regulator_list_voltage_linear - List voltages with simple calculation
1909  *
1910  * @rdev: Regulator device
1911  * @selector: Selector to convert into a voltage
1912  *
1913  * Regulators with a simple linear mapping between voltages and
1914  * selectors can set min_uV and uV_step in the regulator descriptor
1915  * and then use this function as their list_voltage() operation,
1916  */
1917 int regulator_list_voltage_linear(struct regulator_dev *rdev,
1918                                   unsigned int selector)
1919 {
1920         if (selector >= rdev->desc->n_voltages)
1921                 return -EINVAL;
1922
1923         return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1924 }
1925 EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1926
1927 /**
1928  * regulator_list_voltage_table - List voltages with table based mapping
1929  *
1930  * @rdev: Regulator device
1931  * @selector: Selector to convert into a voltage
1932  *
1933  * Regulators with table based mapping between voltages and
1934  * selectors can set volt_table in the regulator descriptor
1935  * and then use this function as their list_voltage() operation.
1936  */
1937 int regulator_list_voltage_table(struct regulator_dev *rdev,
1938                                  unsigned int selector)
1939 {
1940         if (!rdev->desc->volt_table) {
1941                 BUG_ON(!rdev->desc->volt_table);
1942                 return -EINVAL;
1943         }
1944
1945         if (selector >= rdev->desc->n_voltages)
1946                 return -EINVAL;
1947
1948         return rdev->desc->volt_table[selector];
1949 }
1950 EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
1951
1952 /**
1953  * regulator_list_voltage - enumerate supported voltages
1954  * @regulator: regulator source
1955  * @selector: identify voltage to list
1956  * Context: can sleep
1957  *
1958  * Returns a voltage that can be passed to @regulator_set_voltage(),
1959  * zero if this selector code can't be used on this system, or a
1960  * negative errno.
1961  */
1962 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1963 {
1964         struct regulator_dev    *rdev = regulator->rdev;
1965         struct regulator_ops    *ops = rdev->desc->ops;
1966         int                     ret;
1967
1968         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1969                 return -EINVAL;
1970
1971         mutex_lock(&rdev->mutex);
1972         ret = ops->list_voltage(rdev, selector);
1973         mutex_unlock(&rdev->mutex);
1974
1975         if (ret > 0) {
1976                 if (ret < rdev->constraints->min_uV)
1977                         ret = 0;
1978                 else if (ret > rdev->constraints->max_uV)
1979                         ret = 0;
1980         }
1981
1982         return ret;
1983 }
1984 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1985
1986 /**
1987  * regulator_is_supported_voltage - check if a voltage range can be supported
1988  *
1989  * @regulator: Regulator to check.
1990  * @min_uV: Minimum required voltage in uV.
1991  * @max_uV: Maximum required voltage in uV.
1992  *
1993  * Returns a boolean or a negative error code.
1994  */
1995 int regulator_is_supported_voltage(struct regulator *regulator,
1996                                    int min_uV, int max_uV)
1997 {
1998         struct regulator_dev *rdev = regulator->rdev;
1999         int i, voltages, ret;
2000
2001         /* If we can't change voltage check the current voltage */
2002         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2003                 ret = regulator_get_voltage(regulator);
2004                 if (ret >= 0)
2005                         return (min_uV <= ret && ret <= max_uV);
2006                 else
2007                         return ret;
2008         }
2009
2010         /* Any voltage within constrains range is fine? */
2011         if (rdev->desc->continuous_voltage_range)
2012                 return min_uV >= rdev->constraints->min_uV &&
2013                                 max_uV <= rdev->constraints->max_uV;
2014
2015         ret = regulator_count_voltages(regulator);
2016         if (ret < 0)
2017                 return ret;
2018         voltages = ret;
2019
2020         for (i = 0; i < voltages; i++) {
2021                 ret = regulator_list_voltage(regulator, i);
2022
2023                 if (ret >= min_uV && ret <= max_uV)
2024                         return 1;
2025         }
2026
2027         return 0;
2028 }
2029 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2030
2031 /**
2032  * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2033  *
2034  * @rdev: regulator to operate on
2035  *
2036  * Regulators that use regmap for their register I/O can set the
2037  * vsel_reg and vsel_mask fields in their descriptor and then use this
2038  * as their get_voltage_vsel operation, saving some code.
2039  */
2040 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
2041 {
2042         unsigned int val;
2043         int ret;
2044
2045         ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
2046         if (ret != 0)
2047                 return ret;
2048
2049         val &= rdev->desc->vsel_mask;
2050         val >>= ffs(rdev->desc->vsel_mask) - 1;
2051
2052         return val;
2053 }
2054 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
2055
2056 /**
2057  * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2058  *
2059  * @rdev: regulator to operate on
2060  * @sel: Selector to set
2061  *
2062  * Regulators that use regmap for their register I/O can set the
2063  * vsel_reg and vsel_mask fields in their descriptor and then use this
2064  * as their set_voltage_vsel operation, saving some code.
2065  */
2066 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2067 {
2068         sel <<= ffs(rdev->desc->vsel_mask) - 1;
2069
2070         return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2071                                   rdev->desc->vsel_mask, sel);
2072 }
2073 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2074
2075 /**
2076  * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2077  *
2078  * @rdev: Regulator to operate on
2079  * @min_uV: Lower bound for voltage
2080  * @max_uV: Upper bound for voltage
2081  *
2082  * Drivers implementing set_voltage_sel() and list_voltage() can use
2083  * this as their map_voltage() operation.  It will find a suitable
2084  * voltage by calling list_voltage() until it gets something in bounds
2085  * for the requested voltages.
2086  */
2087 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2088                                   int min_uV, int max_uV)
2089 {
2090         int best_val = INT_MAX;
2091         int selector = 0;
2092         int i, ret;
2093
2094         /* Find the smallest voltage that falls within the specified
2095          * range.
2096          */
2097         for (i = 0; i < rdev->desc->n_voltages; i++) {
2098                 ret = rdev->desc->ops->list_voltage(rdev, i);
2099                 if (ret < 0)
2100                         continue;
2101
2102                 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2103                         best_val = ret;
2104                         selector = i;
2105                 }
2106         }
2107
2108         if (best_val != INT_MAX)
2109                 return selector;
2110         else
2111                 return -EINVAL;
2112 }
2113 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2114
2115 /**
2116  * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2117  *
2118  * @rdev: Regulator to operate on
2119  * @min_uV: Lower bound for voltage
2120  * @max_uV: Upper bound for voltage
2121  *
2122  * Drivers providing min_uV and uV_step in their regulator_desc can
2123  * use this as their map_voltage() operation.
2124  */
2125 int regulator_map_voltage_linear(struct regulator_dev *rdev,
2126                                  int min_uV, int max_uV)
2127 {
2128         int ret, voltage;
2129
2130         /* Allow uV_step to be 0 for fixed voltage */
2131         if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2132                 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2133                         return 0;
2134                 else
2135                         return -EINVAL;
2136         }
2137
2138         if (!rdev->desc->uV_step) {
2139                 BUG_ON(!rdev->desc->uV_step);
2140                 return -EINVAL;
2141         }
2142
2143         if (min_uV < rdev->desc->min_uV)
2144                 min_uV = rdev->desc->min_uV;
2145
2146         ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
2147         if (ret < 0)
2148                 return ret;
2149
2150         /* Map back into a voltage to verify we're still in bounds */
2151         voltage = rdev->desc->ops->list_voltage(rdev, ret);
2152         if (voltage < min_uV || voltage > max_uV)
2153                 return -EINVAL;
2154
2155         return ret;
2156 }
2157 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2158
2159 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2160                                      int min_uV, int max_uV)
2161 {
2162         int ret;
2163         int delay = 0;
2164         int best_val = 0;
2165         unsigned int selector;
2166         int old_selector = -1;
2167
2168         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2169
2170         min_uV += rdev->constraints->uV_offset;
2171         max_uV += rdev->constraints->uV_offset;
2172
2173         /*
2174          * If we can't obtain the old selector there is not enough
2175          * info to call set_voltage_time_sel().
2176          */
2177         if (_regulator_is_enabled(rdev) &&
2178             rdev->desc->ops->set_voltage_time_sel &&
2179             rdev->desc->ops->get_voltage_sel) {
2180                 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2181                 if (old_selector < 0)
2182                         return old_selector;
2183         }
2184
2185         if (rdev->desc->ops->set_voltage) {
2186                 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2187                                                    &selector);
2188
2189                 if (ret >= 0) {
2190                         if (rdev->desc->ops->list_voltage)
2191                                 best_val = rdev->desc->ops->list_voltage(rdev,
2192                                                                          selector);
2193                         else
2194                                 best_val = _regulator_get_voltage(rdev);
2195                 }
2196
2197         } else if (rdev->desc->ops->set_voltage_sel) {
2198                 if (rdev->desc->ops->map_voltage) {
2199                         ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2200                                                            max_uV);
2201                 } else {
2202                         if (rdev->desc->ops->list_voltage ==
2203                             regulator_list_voltage_linear)
2204                                 ret = regulator_map_voltage_linear(rdev,
2205                                                                 min_uV, max_uV);
2206                         else
2207                                 ret = regulator_map_voltage_iterate(rdev,
2208                                                                 min_uV, max_uV);
2209                 }
2210
2211                 if (ret >= 0) {
2212                         best_val = rdev->desc->ops->list_voltage(rdev, ret);
2213                         if (min_uV <= best_val && max_uV >= best_val) {
2214                                 selector = ret;
2215                                 ret = rdev->desc->ops->set_voltage_sel(rdev,
2216                                                                        ret);
2217                         } else {
2218                                 ret = -EINVAL;
2219                         }
2220                 }
2221         } else {
2222                 ret = -EINVAL;
2223         }
2224
2225         /* Call set_voltage_time_sel if successfully obtained old_selector */
2226         if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
2227             rdev->desc->ops->set_voltage_time_sel) {
2228
2229                 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2230                                                 old_selector, selector);
2231                 if (delay < 0) {
2232                         rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2233                                   delay);
2234                         delay = 0;
2235                 }
2236
2237                 /* Insert any necessary delays */
2238                 if (delay >= 1000) {
2239                         mdelay(delay / 1000);
2240                         udelay(delay % 1000);
2241                 } else if (delay) {
2242                         udelay(delay);
2243                 }
2244         }
2245
2246         if (ret == 0 && best_val >= 0) {
2247                 unsigned long data = best_val;
2248
2249                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2250                                      (void *)data);
2251         }
2252
2253         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2254
2255         return ret;
2256 }
2257
2258 /**
2259  * regulator_set_voltage - set regulator output voltage
2260  * @regulator: regulator source
2261  * @min_uV: Minimum required voltage in uV
2262  * @max_uV: Maximum acceptable voltage in uV
2263  *
2264  * Sets a voltage regulator to the desired output voltage. This can be set
2265  * during any regulator state. IOW, regulator can be disabled or enabled.
2266  *
2267  * If the regulator is enabled then the voltage will change to the new value
2268  * immediately otherwise if the regulator is disabled the regulator will
2269  * output at the new voltage when enabled.
2270  *
2271  * NOTE: If the regulator is shared between several devices then the lowest
2272  * request voltage that meets the system constraints will be used.
2273  * Regulator system constraints must be set for this regulator before
2274  * calling this function otherwise this call will fail.
2275  */
2276 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2277 {
2278         struct regulator_dev *rdev = regulator->rdev;
2279         int ret = 0;
2280
2281         mutex_lock(&rdev->mutex);
2282
2283         /* If we're setting the same range as last time the change
2284          * should be a noop (some cpufreq implementations use the same
2285          * voltage for multiple frequencies, for example).
2286          */
2287         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2288                 goto out;
2289
2290         /* sanity check */
2291         if (!rdev->desc->ops->set_voltage &&
2292             !rdev->desc->ops->set_voltage_sel) {
2293                 ret = -EINVAL;
2294                 goto out;
2295         }
2296
2297         /* constraints check */
2298         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2299         if (ret < 0)
2300                 goto out;
2301         regulator->min_uV = min_uV;
2302         regulator->max_uV = max_uV;
2303
2304         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2305         if (ret < 0)
2306                 goto out;
2307
2308         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2309
2310 out:
2311         mutex_unlock(&rdev->mutex);
2312         return ret;
2313 }
2314 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2315
2316 /**
2317  * regulator_set_voltage_time - get raise/fall time
2318  * @regulator: regulator source
2319  * @old_uV: starting voltage in microvolts
2320  * @new_uV: target voltage in microvolts
2321  *
2322  * Provided with the starting and ending voltage, this function attempts to
2323  * calculate the time in microseconds required to rise or fall to this new
2324  * voltage.
2325  */
2326 int regulator_set_voltage_time(struct regulator *regulator,
2327                                int old_uV, int new_uV)
2328 {
2329         struct regulator_dev    *rdev = regulator->rdev;
2330         struct regulator_ops    *ops = rdev->desc->ops;
2331         int old_sel = -1;
2332         int new_sel = -1;
2333         int voltage;
2334         int i;
2335
2336         /* Currently requires operations to do this */
2337         if (!ops->list_voltage || !ops->set_voltage_time_sel
2338             || !rdev->desc->n_voltages)
2339                 return -EINVAL;
2340
2341         for (i = 0; i < rdev->desc->n_voltages; i++) {
2342                 /* We only look for exact voltage matches here */
2343                 voltage = regulator_list_voltage(regulator, i);
2344                 if (voltage < 0)
2345                         return -EINVAL;
2346                 if (voltage == 0)
2347                         continue;
2348                 if (voltage == old_uV)
2349                         old_sel = i;
2350                 if (voltage == new_uV)
2351                         new_sel = i;
2352         }
2353
2354         if (old_sel < 0 || new_sel < 0)
2355                 return -EINVAL;
2356
2357         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2358 }
2359 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2360
2361 /**
2362  * regulator_set_voltage_time_sel - get raise/fall time
2363  * @rdev: regulator source device
2364  * @old_selector: selector for starting voltage
2365  * @new_selector: selector for target voltage
2366  *
2367  * Provided with the starting and target voltage selectors, this function
2368  * returns time in microseconds required to rise or fall to this new voltage
2369  *
2370  * Drivers providing ramp_delay in regulation_constraints can use this as their
2371  * set_voltage_time_sel() operation.
2372  */
2373 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2374                                    unsigned int old_selector,
2375                                    unsigned int new_selector)
2376 {
2377         unsigned int ramp_delay = 0;
2378         int old_volt, new_volt;
2379
2380         if (rdev->constraints->ramp_delay)
2381                 ramp_delay = rdev->constraints->ramp_delay;
2382         else if (rdev->desc->ramp_delay)
2383                 ramp_delay = rdev->desc->ramp_delay;
2384
2385         if (ramp_delay == 0) {
2386                 rdev_warn(rdev, "ramp_delay not set\n");
2387                 return 0;
2388         }
2389
2390         /* sanity check */
2391         if (!rdev->desc->ops->list_voltage)
2392                 return -EINVAL;
2393
2394         old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2395         new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2396
2397         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2398 }
2399 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2400
2401 /**
2402  * regulator_sync_voltage - re-apply last regulator output voltage
2403  * @regulator: regulator source
2404  *
2405  * Re-apply the last configured voltage.  This is intended to be used
2406  * where some external control source the consumer is cooperating with
2407  * has caused the configured voltage to change.
2408  */
2409 int regulator_sync_voltage(struct regulator *regulator)
2410 {
2411         struct regulator_dev *rdev = regulator->rdev;
2412         int ret, min_uV, max_uV;
2413
2414         mutex_lock(&rdev->mutex);
2415
2416         if (!rdev->desc->ops->set_voltage &&
2417             !rdev->desc->ops->set_voltage_sel) {
2418                 ret = -EINVAL;
2419                 goto out;
2420         }
2421
2422         /* This is only going to work if we've had a voltage configured. */
2423         if (!regulator->min_uV && !regulator->max_uV) {
2424                 ret = -EINVAL;
2425                 goto out;
2426         }
2427
2428         min_uV = regulator->min_uV;
2429         max_uV = regulator->max_uV;
2430
2431         /* This should be a paranoia check... */
2432         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2433         if (ret < 0)
2434                 goto out;
2435
2436         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2437         if (ret < 0)
2438                 goto out;
2439
2440         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2441
2442 out:
2443         mutex_unlock(&rdev->mutex);
2444         return ret;
2445 }
2446 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2447
2448 static int _regulator_get_voltage(struct regulator_dev *rdev)
2449 {
2450         int sel, ret;
2451
2452         if (rdev->desc->ops->get_voltage_sel) {
2453                 sel = rdev->desc->ops->get_voltage_sel(rdev);
2454                 if (sel < 0)
2455                         return sel;
2456                 ret = rdev->desc->ops->list_voltage(rdev, sel);
2457         } else if (rdev->desc->ops->get_voltage) {
2458                 ret = rdev->desc->ops->get_voltage(rdev);
2459         } else if (rdev->desc->ops->list_voltage) {
2460                 ret = rdev->desc->ops->list_voltage(rdev, 0);
2461         } else {
2462                 return -EINVAL;
2463         }
2464
2465         if (ret < 0)
2466                 return ret;
2467         return ret - rdev->constraints->uV_offset;
2468 }
2469
2470 /**
2471  * regulator_get_voltage - get regulator output voltage
2472  * @regulator: regulator source
2473  *
2474  * This returns the current regulator voltage in uV.
2475  *
2476  * NOTE: If the regulator is disabled it will return the voltage value. This
2477  * function should not be used to determine regulator state.
2478  */
2479 int regulator_get_voltage(struct regulator *regulator)
2480 {
2481         int ret;
2482
2483         mutex_lock(&regulator->rdev->mutex);
2484
2485         ret = _regulator_get_voltage(regulator->rdev);
2486
2487         mutex_unlock(&regulator->rdev->mutex);
2488
2489         return ret;
2490 }
2491 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2492
2493 /**
2494  * regulator_set_current_limit - set regulator output current limit
2495  * @regulator: regulator source
2496  * @min_uA: Minimuum supported current in uA
2497  * @max_uA: Maximum supported current in uA
2498  *
2499  * Sets current sink to the desired output current. This can be set during
2500  * any regulator state. IOW, regulator can be disabled or enabled.
2501  *
2502  * If the regulator is enabled then the current will change to the new value
2503  * immediately otherwise if the regulator is disabled the regulator will
2504  * output at the new current when enabled.
2505  *
2506  * NOTE: Regulator system constraints must be set for this regulator before
2507  * calling this function otherwise this call will fail.
2508  */
2509 int regulator_set_current_limit(struct regulator *regulator,
2510                                int min_uA, int max_uA)
2511 {
2512         struct regulator_dev *rdev = regulator->rdev;
2513         int ret;
2514
2515         mutex_lock(&rdev->mutex);
2516
2517         /* sanity check */
2518         if (!rdev->desc->ops->set_current_limit) {
2519                 ret = -EINVAL;
2520                 goto out;
2521         }
2522
2523         /* constraints check */
2524         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2525         if (ret < 0)
2526                 goto out;
2527
2528         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2529 out:
2530         mutex_unlock(&rdev->mutex);
2531         return ret;
2532 }
2533 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2534
2535 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2536 {
2537         int ret;
2538
2539         mutex_lock(&rdev->mutex);
2540
2541         /* sanity check */
2542         if (!rdev->desc->ops->get_current_limit) {
2543                 ret = -EINVAL;
2544                 goto out;
2545         }
2546
2547         ret = rdev->desc->ops->get_current_limit(rdev);
2548 out:
2549         mutex_unlock(&rdev->mutex);
2550         return ret;
2551 }
2552
2553 /**
2554  * regulator_get_current_limit - get regulator output current
2555  * @regulator: regulator source
2556  *
2557  * This returns the current supplied by the specified current sink in uA.
2558  *
2559  * NOTE: If the regulator is disabled it will return the current value. This
2560  * function should not be used to determine regulator state.
2561  */
2562 int regulator_get_current_limit(struct regulator *regulator)
2563 {
2564         return _regulator_get_current_limit(regulator->rdev);
2565 }
2566 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2567
2568 /**
2569  * regulator_set_mode - set regulator operating mode
2570  * @regulator: regulator source
2571  * @mode: operating mode - one of the REGULATOR_MODE constants
2572  *
2573  * Set regulator operating mode to increase regulator efficiency or improve
2574  * regulation performance.
2575  *
2576  * NOTE: Regulator system constraints must be set for this regulator before
2577  * calling this function otherwise this call will fail.
2578  */
2579 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2580 {
2581         struct regulator_dev *rdev = regulator->rdev;
2582         int ret;
2583         int regulator_curr_mode;
2584
2585         mutex_lock(&rdev->mutex);
2586
2587         /* sanity check */
2588         if (!rdev->desc->ops->set_mode) {
2589                 ret = -EINVAL;
2590                 goto out;
2591         }
2592
2593         /* return if the same mode is requested */
2594         if (rdev->desc->ops->get_mode) {
2595                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2596                 if (regulator_curr_mode == mode) {
2597                         ret = 0;
2598                         goto out;
2599                 }
2600         }
2601
2602         /* constraints check */
2603         ret = regulator_mode_constrain(rdev, &mode);
2604         if (ret < 0)
2605                 goto out;
2606
2607         ret = rdev->desc->ops->set_mode(rdev, mode);
2608 out:
2609         mutex_unlock(&rdev->mutex);
2610         return ret;
2611 }
2612 EXPORT_SYMBOL_GPL(regulator_set_mode);
2613
2614 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2615 {
2616         int ret;
2617
2618         mutex_lock(&rdev->mutex);
2619
2620         /* sanity check */
2621         if (!rdev->desc->ops->get_mode) {
2622                 ret = -EINVAL;
2623                 goto out;
2624         }
2625
2626         ret = rdev->desc->ops->get_mode(rdev);
2627 out:
2628         mutex_unlock(&rdev->mutex);
2629         return ret;
2630 }
2631
2632 /**
2633  * regulator_get_mode - get regulator operating mode
2634  * @regulator: regulator source
2635  *
2636  * Get the current regulator operating mode.
2637  */
2638 unsigned int regulator_get_mode(struct regulator *regulator)
2639 {
2640         return _regulator_get_mode(regulator->rdev);
2641 }
2642 EXPORT_SYMBOL_GPL(regulator_get_mode);
2643
2644 /**
2645  * regulator_set_optimum_mode - set regulator optimum operating mode
2646  * @regulator: regulator source
2647  * @uA_load: load current
2648  *
2649  * Notifies the regulator core of a new device load. This is then used by
2650  * DRMS (if enabled by constraints) to set the most efficient regulator
2651  * operating mode for the new regulator loading.
2652  *
2653  * Consumer devices notify their supply regulator of the maximum power
2654  * they will require (can be taken from device datasheet in the power
2655  * consumption tables) when they change operational status and hence power
2656  * state. Examples of operational state changes that can affect power
2657  * consumption are :-
2658  *
2659  *    o Device is opened / closed.
2660  *    o Device I/O is about to begin or has just finished.
2661  *    o Device is idling in between work.
2662  *
2663  * This information is also exported via sysfs to userspace.
2664  *
2665  * DRMS will sum the total requested load on the regulator and change
2666  * to the most efficient operating mode if platform constraints allow.
2667  *
2668  * Returns the new regulator mode or error.
2669  */
2670 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2671 {
2672         struct regulator_dev *rdev = regulator->rdev;
2673         struct regulator *consumer;
2674         int ret, output_uV, input_uV = 0, total_uA_load = 0;
2675         unsigned int mode;
2676
2677         if (rdev->supply)
2678                 input_uV = regulator_get_voltage(rdev->supply);
2679
2680         mutex_lock(&rdev->mutex);
2681
2682         /*
2683          * first check to see if we can set modes at all, otherwise just
2684          * tell the consumer everything is OK.
2685          */
2686         regulator->uA_load = uA_load;
2687         ret = regulator_check_drms(rdev);
2688         if (ret < 0) {
2689                 ret = 0;
2690                 goto out;
2691         }
2692
2693         if (!rdev->desc->ops->get_optimum_mode)
2694                 goto out;
2695
2696         /*
2697          * we can actually do this so any errors are indicators of
2698          * potential real failure.
2699          */
2700         ret = -EINVAL;
2701
2702         if (!rdev->desc->ops->set_mode)
2703                 goto out;
2704
2705         /* get output voltage */
2706         output_uV = _regulator_get_voltage(rdev);
2707         if (output_uV <= 0) {
2708                 rdev_err(rdev, "invalid output voltage found\n");
2709                 goto out;
2710         }
2711
2712         /* No supply? Use constraint voltage */
2713         if (input_uV <= 0)
2714                 input_uV = rdev->constraints->input_uV;
2715         if (input_uV <= 0) {
2716                 rdev_err(rdev, "invalid input voltage found\n");
2717                 goto out;
2718         }
2719
2720         /* calc total requested load for this regulator */
2721         list_for_each_entry(consumer, &rdev->consumer_list, list)
2722                 total_uA_load += consumer->uA_load;
2723
2724         mode = rdev->desc->ops->get_optimum_mode(rdev,
2725                                                  input_uV, output_uV,
2726                                                  total_uA_load);
2727         ret = regulator_mode_constrain(rdev, &mode);
2728         if (ret < 0) {
2729                 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2730                          total_uA_load, input_uV, output_uV);
2731                 goto out;
2732         }
2733
2734         ret = rdev->desc->ops->set_mode(rdev, mode);
2735         if (ret < 0) {
2736                 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2737                 goto out;
2738         }
2739         ret = mode;
2740 out:
2741         mutex_unlock(&rdev->mutex);
2742         return ret;
2743 }
2744 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2745
2746 /**
2747  * regulator_set_bypass_regmap - Default set_bypass() using regmap
2748  *
2749  * @rdev: device to operate on.
2750  * @enable: state to set.
2751  */
2752 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
2753 {
2754         unsigned int val;
2755
2756         if (enable)
2757                 val = rdev->desc->bypass_mask;
2758         else
2759                 val = 0;
2760
2761         return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
2762                                   rdev->desc->bypass_mask, val);
2763 }
2764 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
2765
2766 /**
2767  * regulator_get_bypass_regmap - Default get_bypass() using regmap
2768  *
2769  * @rdev: device to operate on.
2770  * @enable: current state.
2771  */
2772 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
2773 {
2774         unsigned int val;
2775         int ret;
2776
2777         ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
2778         if (ret != 0)
2779                 return ret;
2780
2781         *enable = val & rdev->desc->bypass_mask;
2782
2783         return 0;
2784 }
2785 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
2786
2787 /**
2788  * regulator_allow_bypass - allow the regulator to go into bypass mode
2789  *
2790  * @regulator: Regulator to configure
2791  * @allow: enable or disable bypass mode
2792  *
2793  * Allow the regulator to go into bypass mode if all other consumers
2794  * for the regulator also enable bypass mode and the machine
2795  * constraints allow this.  Bypass mode means that the regulator is
2796  * simply passing the input directly to the output with no regulation.
2797  */
2798 int regulator_allow_bypass(struct regulator *regulator, bool enable)
2799 {
2800         struct regulator_dev *rdev = regulator->rdev;
2801         int ret = 0;
2802
2803         if (!rdev->desc->ops->set_bypass)
2804                 return 0;
2805
2806         if (rdev->constraints &&
2807             !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2808                 return 0;
2809
2810         mutex_lock(&rdev->mutex);
2811
2812         if (enable && !regulator->bypass) {
2813                 rdev->bypass_count++;
2814
2815                 if (rdev->bypass_count == rdev->open_count) {
2816                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2817                         if (ret != 0)
2818                                 rdev->bypass_count--;
2819                 }
2820
2821         } else if (!enable && regulator->bypass) {
2822                 rdev->bypass_count--;
2823
2824                 if (rdev->bypass_count != rdev->open_count) {
2825                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2826                         if (ret != 0)
2827                                 rdev->bypass_count++;
2828                 }
2829         }
2830
2831         if (ret == 0)
2832                 regulator->bypass = enable;
2833
2834         mutex_unlock(&rdev->mutex);
2835
2836         return ret;
2837 }
2838 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2839
2840 /**
2841  * regulator_register_notifier - register regulator event notifier
2842  * @regulator: regulator source
2843  * @nb: notifier block
2844  *
2845  * Register notifier block to receive regulator events.
2846  */
2847 int regulator_register_notifier(struct regulator *regulator,
2848                               struct notifier_block *nb)
2849 {
2850         return blocking_notifier_chain_register(&regulator->rdev->notifier,
2851                                                 nb);
2852 }
2853 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2854
2855 /**
2856  * regulator_unregister_notifier - unregister regulator event notifier
2857  * @regulator: regulator source
2858  * @nb: notifier block
2859  *
2860  * Unregister regulator event notifier block.
2861  */
2862 int regulator_unregister_notifier(struct regulator *regulator,
2863                                 struct notifier_block *nb)
2864 {
2865         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2866                                                   nb);
2867 }
2868 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2869
2870 /* notify regulator consumers and downstream regulator consumers.
2871  * Note mutex must be held by caller.
2872  */
2873 static void _notifier_call_chain(struct regulator_dev *rdev,
2874                                   unsigned long event, void *data)
2875 {
2876         /* call rdev chain first */
2877         blocking_notifier_call_chain(&rdev->notifier, event, data);
2878 }
2879
2880 /**
2881  * regulator_bulk_get - get multiple regulator consumers
2882  *
2883  * @dev:           Device to supply
2884  * @num_consumers: Number of consumers to register
2885  * @consumers:     Configuration of consumers; clients are stored here.
2886  *
2887  * @return 0 on success, an errno on failure.
2888  *
2889  * This helper function allows drivers to get several regulator
2890  * consumers in one operation.  If any of the regulators cannot be
2891  * acquired then any regulators that were allocated will be freed
2892  * before returning to the caller.
2893  */
2894 int regulator_bulk_get(struct device *dev, int num_consumers,
2895                        struct regulator_bulk_data *consumers)
2896 {
2897         int i;
2898         int ret;
2899
2900         for (i = 0; i < num_consumers; i++)
2901                 consumers[i].consumer = NULL;
2902
2903         for (i = 0; i < num_consumers; i++) {
2904                 consumers[i].consumer = regulator_get(dev,
2905                                                       consumers[i].supply);
2906                 if (IS_ERR(consumers[i].consumer)) {
2907                         ret = PTR_ERR(consumers[i].consumer);
2908                         dev_err(dev, "Failed to get supply '%s': %d\n",
2909                                 consumers[i].supply, ret);
2910                         consumers[i].consumer = NULL;
2911                         goto err;
2912                 }
2913         }
2914
2915         return 0;
2916
2917 err:
2918         while (--i >= 0)
2919                 regulator_put(consumers[i].consumer);
2920
2921         return ret;
2922 }
2923 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2924
2925 /**
2926  * devm_regulator_bulk_get - managed get multiple regulator consumers
2927  *
2928  * @dev:           Device to supply
2929  * @num_consumers: Number of consumers to register
2930  * @consumers:     Configuration of consumers; clients are stored here.
2931  *
2932  * @return 0 on success, an errno on failure.
2933  *
2934  * This helper function allows drivers to get several regulator
2935  * consumers in one operation with management, the regulators will
2936  * automatically be freed when the device is unbound.  If any of the
2937  * regulators cannot be acquired then any regulators that were
2938  * allocated will be freed before returning to the caller.
2939  */
2940 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2941                             struct regulator_bulk_data *consumers)
2942 {
2943         int i;
2944         int ret;
2945
2946         for (i = 0; i < num_consumers; i++)
2947                 consumers[i].consumer = NULL;
2948
2949         for (i = 0; i < num_consumers; i++) {
2950                 consumers[i].consumer = devm_regulator_get(dev,
2951                                                            consumers[i].supply);
2952                 if (IS_ERR(consumers[i].consumer)) {
2953                         ret = PTR_ERR(consumers[i].consumer);
2954                         dev_err(dev, "Failed to get supply '%s': %d\n",
2955                                 consumers[i].supply, ret);
2956                         consumers[i].consumer = NULL;
2957                         goto err;
2958                 }
2959         }
2960
2961         return 0;
2962
2963 err:
2964         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2965                 devm_regulator_put(consumers[i].consumer);
2966
2967         return ret;
2968 }
2969 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2970
2971 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2972 {
2973         struct regulator_bulk_data *bulk = data;
2974
2975         bulk->ret = regulator_enable(bulk->consumer);
2976 }
2977
2978 /**
2979  * regulator_bulk_enable - enable multiple regulator consumers
2980  *
2981  * @num_consumers: Number of consumers
2982  * @consumers:     Consumer data; clients are stored here.
2983  * @return         0 on success, an errno on failure
2984  *
2985  * This convenience API allows consumers to enable multiple regulator
2986  * clients in a single API call.  If any consumers cannot be enabled
2987  * then any others that were enabled will be disabled again prior to
2988  * return.
2989  */
2990 int regulator_bulk_enable(int num_consumers,
2991                           struct regulator_bulk_data *consumers)
2992 {
2993         ASYNC_DOMAIN_EXCLUSIVE(async_domain);
2994         int i;
2995         int ret = 0;
2996
2997         for (i = 0; i < num_consumers; i++) {
2998                 if (consumers[i].consumer->always_on)
2999                         consumers[i].ret = 0;
3000                 else
3001                         async_schedule_domain(regulator_bulk_enable_async,
3002                                               &consumers[i], &async_domain);
3003         }
3004
3005         async_synchronize_full_domain(&async_domain);
3006
3007         /* If any consumer failed we need to unwind any that succeeded */
3008         for (i = 0; i < num_consumers; i++) {
3009                 if (consumers[i].ret != 0) {
3010                         ret = consumers[i].ret;
3011                         goto err;
3012                 }
3013         }
3014
3015         return 0;
3016
3017 err:
3018         pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
3019         while (--i >= 0)
3020                 regulator_disable(consumers[i].consumer);
3021
3022         return ret;
3023 }
3024 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3025
3026 /**
3027  * regulator_bulk_disable - disable multiple regulator consumers
3028  *
3029  * @num_consumers: Number of consumers
3030  * @consumers:     Consumer data; clients are stored here.
3031  * @return         0 on success, an errno on failure
3032  *
3033  * This convenience API allows consumers to disable multiple regulator
3034  * clients in a single API call.  If any consumers cannot be disabled
3035  * then any others that were disabled will be enabled again prior to
3036  * return.
3037  */
3038 int regulator_bulk_disable(int num_consumers,
3039                            struct regulator_bulk_data *consumers)
3040 {
3041         int i;
3042         int ret, r;
3043
3044         for (i = num_consumers - 1; i >= 0; --i) {
3045                 ret = regulator_disable(consumers[i].consumer);
3046                 if (ret != 0)
3047                         goto err;
3048         }
3049
3050         return 0;
3051
3052 err:
3053         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3054         for (++i; i < num_consumers; ++i) {
3055                 r = regulator_enable(consumers[i].consumer);
3056                 if (r != 0)
3057                         pr_err("Failed to reename %s: %d\n",
3058                                consumers[i].supply, r);
3059         }
3060
3061         return ret;
3062 }
3063 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3064
3065 /**
3066  * regulator_bulk_force_disable - force disable multiple regulator consumers
3067  *
3068  * @num_consumers: Number of consumers
3069  * @consumers:     Consumer data; clients are stored here.
3070  * @return         0 on success, an errno on failure
3071  *
3072  * This convenience API allows consumers to forcibly disable multiple regulator
3073  * clients in a single API call.
3074  * NOTE: This should be used for situations when device damage will
3075  * likely occur if the regulators are not disabled (e.g. over temp).
3076  * Although regulator_force_disable function call for some consumers can
3077  * return error numbers, the function is called for all consumers.
3078  */
3079 int regulator_bulk_force_disable(int num_consumers,
3080                            struct regulator_bulk_data *consumers)
3081 {
3082         int i;
3083         int ret;
3084
3085         for (i = 0; i < num_consumers; i++)
3086                 consumers[i].ret =
3087                             regulator_force_disable(consumers[i].consumer);
3088
3089         for (i = 0; i < num_consumers; i++) {
3090                 if (consumers[i].ret != 0) {
3091                         ret = consumers[i].ret;
3092                         goto out;
3093                 }
3094         }
3095
3096         return 0;
3097 out:
3098         return ret;
3099 }
3100 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3101
3102 /**
3103  * regulator_bulk_free - free multiple regulator consumers
3104  *
3105  * @num_consumers: Number of consumers
3106  * @consumers:     Consumer data; clients are stored here.
3107  *
3108  * This convenience API allows consumers to free multiple regulator
3109  * clients in a single API call.
3110  */
3111 void regulator_bulk_free(int num_consumers,
3112                          struct regulator_bulk_data *consumers)
3113 {
3114         int i;
3115
3116         for (i = 0; i < num_consumers; i++) {
3117                 regulator_put(consumers[i].consumer);
3118                 consumers[i].consumer = NULL;
3119         }
3120 }
3121 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3122
3123 /**
3124  * regulator_notifier_call_chain - call regulator event notifier
3125  * @rdev: regulator source
3126  * @event: notifier block
3127  * @data: callback-specific data.
3128  *
3129  * Called by regulator drivers to notify clients a regulator event has
3130  * occurred. We also notify regulator clients downstream.
3131  * Note lock must be held by caller.
3132  */
3133 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3134                                   unsigned long event, void *data)
3135 {
3136         _notifier_call_chain(rdev, event, data);
3137         return NOTIFY_DONE;
3138
3139 }
3140 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3141
3142 /**
3143  * regulator_mode_to_status - convert a regulator mode into a status
3144  *
3145  * @mode: Mode to convert
3146  *
3147  * Convert a regulator mode into a status.
3148  */
3149 int regulator_mode_to_status(unsigned int mode)
3150 {
3151         switch (mode) {
3152         case REGULATOR_MODE_FAST:
3153                 return REGULATOR_STATUS_FAST;
3154         case REGULATOR_MODE_NORMAL:
3155                 return REGULATOR_STATUS_NORMAL;
3156         case REGULATOR_MODE_IDLE:
3157                 return REGULATOR_STATUS_IDLE;
3158         case REGULATOR_MODE_STANDBY:
3159                 return REGULATOR_STATUS_STANDBY;
3160         default:
3161                 return REGULATOR_STATUS_UNDEFINED;
3162         }
3163 }
3164 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3165
3166 /*
3167  * To avoid cluttering sysfs (and memory) with useless state, only
3168  * create attributes that can be meaningfully displayed.
3169  */
3170 static int add_regulator_attributes(struct regulator_dev *rdev)
3171 {
3172         struct device           *dev = &rdev->dev;
3173         struct regulator_ops    *ops = rdev->desc->ops;
3174         int                     status = 0;
3175
3176         /* some attributes need specific methods to be displayed */
3177         if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3178             (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3179             (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
3180                 status = device_create_file(dev, &dev_attr_microvolts);
3181                 if (status < 0)
3182                         return status;
3183         }
3184         if (ops->get_current_limit) {
3185                 status = device_create_file(dev, &dev_attr_microamps);
3186                 if (status < 0)
3187                         return status;
3188         }
3189         if (ops->get_mode) {
3190                 status = device_create_file(dev, &dev_attr_opmode);
3191                 if (status < 0)
3192                         return status;
3193         }
3194         if (ops->is_enabled) {
3195                 status = device_create_file(dev, &dev_attr_state);
3196                 if (status < 0)
3197                         return status;
3198         }
3199         if (ops->get_status) {
3200                 status = device_create_file(dev, &dev_attr_status);
3201                 if (status < 0)
3202                         return status;
3203         }
3204         if (ops->get_bypass) {
3205                 status = device_create_file(dev, &dev_attr_bypass);
3206                 if (status < 0)
3207                         return status;
3208         }
3209
3210         /* some attributes are type-specific */
3211         if (rdev->desc->type == REGULATOR_CURRENT) {
3212                 status = device_create_file(dev, &dev_attr_requested_microamps);
3213                 if (status < 0)
3214                         return status;
3215         }
3216
3217         /* all the other attributes exist to support constraints;
3218          * don't show them if there are no constraints, or if the
3219          * relevant supporting methods are missing.
3220          */
3221         if (!rdev->constraints)
3222                 return status;
3223
3224         /* constraints need specific supporting methods */
3225         if (ops->set_voltage || ops->set_voltage_sel) {
3226                 status = device_create_file(dev, &dev_attr_min_microvolts);
3227                 if (status < 0)
3228                         return status;
3229                 status = device_create_file(dev, &dev_attr_max_microvolts);
3230                 if (status < 0)
3231                         return status;
3232         }
3233         if (ops->set_current_limit) {
3234                 status = device_create_file(dev, &dev_attr_min_microamps);
3235                 if (status < 0)
3236                         return status;
3237                 status = device_create_file(dev, &dev_attr_max_microamps);
3238                 if (status < 0)
3239                         return status;
3240         }
3241
3242         status = device_create_file(dev, &dev_attr_suspend_standby_state);
3243         if (status < 0)
3244                 return status;
3245         status = device_create_file(dev, &dev_attr_suspend_mem_state);
3246         if (status < 0)
3247                 return status;
3248         status = device_create_file(dev, &dev_attr_suspend_disk_state);
3249         if (status < 0)
3250                 return status;
3251
3252         if (ops->set_suspend_voltage) {
3253                 status = device_create_file(dev,
3254                                 &dev_attr_suspend_standby_microvolts);
3255                 if (status < 0)
3256                         return status;
3257                 status = device_create_file(dev,
3258                                 &dev_attr_suspend_mem_microvolts);
3259                 if (status < 0)
3260                         return status;
3261                 status = device_create_file(dev,
3262                                 &dev_attr_suspend_disk_microvolts);
3263                 if (status < 0)
3264                         return status;
3265         }
3266
3267         if (ops->set_suspend_mode) {
3268                 status = device_create_file(dev,
3269                                 &dev_attr_suspend_standby_mode);
3270                 if (status < 0)
3271                         return status;
3272                 status = device_create_file(dev,
3273                                 &dev_attr_suspend_mem_mode);
3274                 if (status < 0)
3275                         return status;
3276                 status = device_create_file(dev,
3277                                 &dev_attr_suspend_disk_mode);
3278                 if (status < 0)
3279                         return status;
3280         }
3281
3282         return status;
3283 }
3284
3285 static void rdev_init_debugfs(struct regulator_dev *rdev)
3286 {
3287         rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3288         if (!rdev->debugfs) {
3289                 rdev_warn(rdev, "Failed to create debugfs directory\n");
3290                 return;
3291         }
3292
3293         debugfs_create_u32("use_count", 0444, rdev->debugfs,
3294                            &rdev->use_count);
3295         debugfs_create_u32("open_count", 0444, rdev->debugfs,
3296                            &rdev->open_count);
3297         debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3298                            &rdev->bypass_count);
3299 }
3300
3301 /**
3302  * regulator_register - register regulator
3303  * @regulator_desc: regulator to register
3304  * @config: runtime configuration for regulator
3305  *
3306  * Called by regulator drivers to register a regulator.
3307  * Returns 0 on success.
3308  */
3309 struct regulator_dev *
3310 regulator_register(const struct regulator_desc *regulator_desc,
3311                    const struct regulator_config *config)
3312 {
3313         const struct regulation_constraints *constraints = NULL;
3314         const struct regulator_init_data *init_data;
3315         static atomic_t regulator_no = ATOMIC_INIT(0);
3316         struct regulator_dev *rdev;
3317         struct device *dev;
3318         int ret, i;
3319         const char *supply = NULL;
3320
3321         if (regulator_desc == NULL || config == NULL)
3322                 return ERR_PTR(-EINVAL);
3323
3324         dev = config->dev;
3325         WARN_ON(!dev);
3326
3327         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3328                 return ERR_PTR(-EINVAL);
3329
3330         if (regulator_desc->type != REGULATOR_VOLTAGE &&
3331             regulator_desc->type != REGULATOR_CURRENT)
3332                 return ERR_PTR(-EINVAL);
3333
3334         /* Only one of each should be implemented */
3335         WARN_ON(regulator_desc->ops->get_voltage &&
3336                 regulator_desc->ops->get_voltage_sel);
3337         WARN_ON(regulator_desc->ops->set_voltage &&
3338                 regulator_desc->ops->set_voltage_sel);
3339
3340         /* If we're using selectors we must implement list_voltage. */
3341         if (regulator_desc->ops->get_voltage_sel &&
3342             !regulator_desc->ops->list_voltage) {
3343                 return ERR_PTR(-EINVAL);
3344         }
3345         if (regulator_desc->ops->set_voltage_sel &&
3346             !regulator_desc->ops->list_voltage) {
3347                 return ERR_PTR(-EINVAL);
3348         }
3349
3350         init_data = config->init_data;
3351
3352         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3353         if (rdev == NULL)
3354                 return ERR_PTR(-ENOMEM);
3355
3356         mutex_lock(&regulator_list_mutex);
3357
3358         mutex_init(&rdev->mutex);
3359         rdev->reg_data = config->driver_data;
3360         rdev->owner = regulator_desc->owner;
3361         rdev->desc = regulator_desc;
3362         if (config->regmap)
3363                 rdev->regmap = config->regmap;
3364         else if (dev_get_regmap(dev, NULL))
3365                 rdev->regmap = dev_get_regmap(dev, NULL);
3366         else if (dev->parent)
3367                 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3368         INIT_LIST_HEAD(&rdev->consumer_list);
3369         INIT_LIST_HEAD(&rdev->list);
3370         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3371         INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3372
3373         /* preform any regulator specific init */
3374         if (init_data && init_data->regulator_init) {
3375                 ret = init_data->regulator_init(rdev->reg_data);
3376                 if (ret < 0)
3377                         goto clean;
3378         }
3379
3380         /* register with sysfs */
3381         rdev->dev.class = &regulator_class;
3382         rdev->dev.of_node = config->of_node;
3383         rdev->dev.parent = dev;
3384         dev_set_name(&rdev->dev, "regulator.%d",
3385                      atomic_inc_return(&regulator_no) - 1);
3386         ret = device_register(&rdev->dev);
3387         if (ret != 0) {
3388                 put_device(&rdev->dev);
3389                 goto clean;
3390         }
3391
3392         dev_set_drvdata(&rdev->dev, rdev);
3393
3394         if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3395                 ret = gpio_request_one(config->ena_gpio,
3396                                        GPIOF_DIR_OUT | config->ena_gpio_flags,
3397                                        rdev_get_name(rdev));
3398                 if (ret != 0) {
3399                         rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3400                                  config->ena_gpio, ret);
3401                         goto wash;
3402                 }
3403
3404                 rdev->ena_gpio = config->ena_gpio;
3405                 rdev->ena_gpio_invert = config->ena_gpio_invert;
3406
3407                 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3408                         rdev->ena_gpio_state = 1;
3409
3410                 if (rdev->ena_gpio_invert)
3411                         rdev->ena_gpio_state = !rdev->ena_gpio_state;
3412         }
3413
3414         /* set regulator constraints */
3415         if (init_data)
3416                 constraints = &init_data->constraints;
3417
3418         ret = set_machine_constraints(rdev, constraints);
3419         if (ret < 0)
3420                 goto scrub;
3421
3422         /* add attributes supported by this regulator */
3423         ret = add_regulator_attributes(rdev);
3424         if (ret < 0)
3425                 goto scrub;
3426
3427         if (init_data && init_data->supply_regulator)
3428                 supply = init_data->supply_regulator;
3429         else if (regulator_desc->supply_name)
3430                 supply = regulator_desc->supply_name;
3431
3432         if (supply) {
3433                 struct regulator_dev *r;
3434
3435                 r = regulator_dev_lookup(dev, supply, &ret);
3436
3437                 if (!r) {
3438                         dev_err(dev, "Failed to find supply %s\n", supply);
3439                         ret = -EPROBE_DEFER;
3440                         goto scrub;
3441                 }
3442
3443                 ret = set_supply(rdev, r);
3444                 if (ret < 0)
3445                         goto scrub;
3446
3447                 /* Enable supply if rail is enabled */
3448                 if (_regulator_is_enabled(rdev)) {
3449                         ret = regulator_enable(rdev->supply);
3450                         if (ret < 0)
3451                                 goto scrub;
3452                 }
3453         }
3454
3455         /* add consumers devices */
3456         if (init_data) {
3457                 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3458                         ret = set_consumer_device_supply(rdev,
3459                                 init_data->consumer_supplies[i].dev_name,
3460                                 init_data->consumer_supplies[i].supply);
3461                         if (ret < 0) {
3462                                 dev_err(dev, "Failed to set supply %s\n",
3463                                         init_data->consumer_supplies[i].supply);
3464                                 goto unset_supplies;
3465                         }
3466                 }
3467         }
3468
3469         list_add(&rdev->list, &regulator_list);
3470
3471         rdev_init_debugfs(rdev);
3472 out:
3473         mutex_unlock(&regulator_list_mutex);
3474         return rdev;
3475
3476 unset_supplies:
3477         unset_regulator_supplies(rdev);
3478
3479 scrub:
3480         if (rdev->supply)
3481                 _regulator_put(rdev->supply);
3482         if (rdev->ena_gpio)
3483                 gpio_free(rdev->ena_gpio);
3484         kfree(rdev->constraints);
3485 wash:
3486         device_unregister(&rdev->dev);
3487         /* device core frees rdev */
3488         rdev = ERR_PTR(ret);
3489         goto out;
3490
3491 clean:
3492         kfree(rdev);
3493         rdev = ERR_PTR(ret);
3494         goto out;
3495 }
3496 EXPORT_SYMBOL_GPL(regulator_register);
3497
3498 /**
3499  * regulator_unregister - unregister regulator
3500  * @rdev: regulator to unregister
3501  *
3502  * Called by regulator drivers to unregister a regulator.
3503  */
3504 void regulator_unregister(struct regulator_dev *rdev)
3505 {
3506         if (rdev == NULL)
3507                 return;
3508
3509         if (rdev->supply)
3510                 regulator_put(rdev->supply);
3511         mutex_lock(&regulator_list_mutex);
3512         debugfs_remove_recursive(rdev->debugfs);
3513         flush_work(&rdev->disable_work.work);
3514         WARN_ON(rdev->open_count);
3515         unset_regulator_supplies(rdev);
3516         list_del(&rdev->list);
3517         kfree(rdev->constraints);
3518         if (rdev->ena_gpio)
3519                 gpio_free(rdev->ena_gpio);
3520         device_unregister(&rdev->dev);
3521         mutex_unlock(&regulator_list_mutex);
3522 }
3523 EXPORT_SYMBOL_GPL(regulator_unregister);
3524
3525 /**
3526  * regulator_suspend_prepare - prepare regulators for system wide suspend
3527  * @state: system suspend state
3528  *
3529  * Configure each regulator with it's suspend operating parameters for state.
3530  * This will usually be called by machine suspend code prior to supending.
3531  */
3532 int regulator_suspend_prepare(suspend_state_t state)
3533 {
3534         struct regulator_dev *rdev;
3535         int ret = 0;
3536
3537         /* ON is handled by regulator active state */
3538         if (state == PM_SUSPEND_ON)
3539                 return -EINVAL;
3540
3541         mutex_lock(&regulator_list_mutex);
3542         list_for_each_entry(rdev, &regulator_list, list) {
3543
3544                 mutex_lock(&rdev->mutex);
3545                 ret = suspend_prepare(rdev, state);
3546                 mutex_unlock(&rdev->mutex);
3547
3548                 if (ret < 0) {
3549                         rdev_err(rdev, "failed to prepare\n");
3550                         goto out;
3551                 }
3552         }
3553 out:
3554         mutex_unlock(&regulator_list_mutex);
3555         return ret;
3556 }
3557 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3558
3559 /**
3560  * regulator_suspend_finish - resume regulators from system wide suspend
3561  *
3562  * Turn on regulators that might be turned off by regulator_suspend_prepare
3563  * and that should be turned on according to the regulators properties.
3564  */
3565 int regulator_suspend_finish(void)
3566 {
3567         struct regulator_dev *rdev;
3568         int ret = 0, error;
3569
3570         mutex_lock(&regulator_list_mutex);
3571         list_for_each_entry(rdev, &regulator_list, list) {
3572                 struct regulator_ops *ops = rdev->desc->ops;
3573
3574                 mutex_lock(&rdev->mutex);
3575                 if ((rdev->use_count > 0  || rdev->constraints->always_on) &&
3576                                 ops->enable) {
3577                         error = ops->enable(rdev);
3578                         if (error)
3579                                 ret = error;
3580                 } else {
3581                         if (!has_full_constraints)
3582                                 goto unlock;
3583                         if (!ops->disable)
3584                                 goto unlock;
3585                         if (!_regulator_is_enabled(rdev))
3586                                 goto unlock;
3587
3588                         error = ops->disable(rdev);
3589                         if (error)
3590                                 ret = error;
3591                 }
3592 unlock:
3593                 mutex_unlock(&rdev->mutex);
3594         }
3595         mutex_unlock(&regulator_list_mutex);
3596         return ret;
3597 }
3598 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3599
3600 /**
3601  * regulator_has_full_constraints - the system has fully specified constraints
3602  *
3603  * Calling this function will cause the regulator API to disable all
3604  * regulators which have a zero use count and don't have an always_on
3605  * constraint in a late_initcall.
3606  *
3607  * The intention is that this will become the default behaviour in a
3608  * future kernel release so users are encouraged to use this facility
3609  * now.
3610  */
3611 void regulator_has_full_constraints(void)
3612 {
3613         has_full_constraints = 1;
3614 }
3615 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3616
3617 /**
3618  * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3619  *
3620  * Calling this function will cause the regulator API to provide a
3621  * dummy regulator to consumers if no physical regulator is found,
3622  * allowing most consumers to proceed as though a regulator were
3623  * configured.  This allows systems such as those with software
3624  * controllable regulators for the CPU core only to be brought up more
3625  * readily.
3626  */
3627 void regulator_use_dummy_regulator(void)
3628 {
3629         board_wants_dummy_regulator = true;
3630 }
3631 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3632
3633 /**
3634  * rdev_get_drvdata - get rdev regulator driver data
3635  * @rdev: regulator
3636  *
3637  * Get rdev regulator driver private data. This call can be used in the
3638  * regulator driver context.
3639  */
3640 void *rdev_get_drvdata(struct regulator_dev *rdev)
3641 {
3642         return rdev->reg_data;
3643 }
3644 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3645
3646 /**
3647  * regulator_get_drvdata - get regulator driver data
3648  * @regulator: regulator
3649  *
3650  * Get regulator driver private data. This call can be used in the consumer
3651  * driver context when non API regulator specific functions need to be called.
3652  */
3653 void *regulator_get_drvdata(struct regulator *regulator)
3654 {
3655         return regulator->rdev->reg_data;
3656 }
3657 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3658
3659 /**
3660  * regulator_set_drvdata - set regulator driver data
3661  * @regulator: regulator
3662  * @data: data
3663  */
3664 void regulator_set_drvdata(struct regulator *regulator, void *data)
3665 {
3666         regulator->rdev->reg_data = data;
3667 }
3668 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3669
3670 /**
3671  * regulator_get_id - get regulator ID
3672  * @rdev: regulator
3673  */
3674 int rdev_get_id(struct regulator_dev *rdev)
3675 {
3676         return rdev->desc->id;
3677 }
3678 EXPORT_SYMBOL_GPL(rdev_get_id);
3679
3680 struct device *rdev_get_dev(struct regulator_dev *rdev)
3681 {
3682         return &rdev->dev;
3683 }
3684 EXPORT_SYMBOL_GPL(rdev_get_dev);
3685
3686 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3687 {
3688         return reg_init_data->driver_data;
3689 }
3690 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3691
3692 #ifdef CONFIG_DEBUG_FS
3693 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3694                                     size_t count, loff_t *ppos)
3695 {
3696         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3697         ssize_t len, ret = 0;
3698         struct regulator_map *map;
3699
3700         if (!buf)
3701                 return -ENOMEM;
3702
3703         list_for_each_entry(map, &regulator_map_list, list) {
3704                 len = snprintf(buf + ret, PAGE_SIZE - ret,
3705                                "%s -> %s.%s\n",
3706                                rdev_get_name(map->regulator), map->dev_name,
3707                                map->supply);
3708                 if (len >= 0)
3709                         ret += len;
3710                 if (ret > PAGE_SIZE) {
3711                         ret = PAGE_SIZE;
3712                         break;
3713                 }
3714         }
3715
3716         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3717
3718         kfree(buf);
3719
3720         return ret;
3721 }
3722 #endif
3723
3724 static const struct file_operations supply_map_fops = {
3725 #ifdef CONFIG_DEBUG_FS
3726         .read = supply_map_read_file,
3727         .llseek = default_llseek,
3728 #endif
3729 };
3730
3731 static int __init regulator_init(void)
3732 {
3733         int ret;
3734
3735         ret = class_register(&regulator_class);
3736
3737         debugfs_root = debugfs_create_dir("regulator", NULL);
3738         if (!debugfs_root)
3739                 pr_warn("regulator: Failed to create debugfs directory\n");
3740
3741         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3742                             &supply_map_fops);
3743
3744         regulator_dummy_init();
3745
3746         return ret;
3747 }
3748
3749 /* init early to allow our consumers to complete system booting */
3750 core_initcall(regulator_init);
3751
3752 static int __init regulator_init_complete(void)
3753 {
3754         struct regulator_dev *rdev;
3755         struct regulator_ops *ops;
3756         struct regulation_constraints *c;
3757         int enabled, ret;
3758
3759         /*
3760          * Since DT doesn't provide an idiomatic mechanism for
3761          * enabling full constraints and since it's much more natural
3762          * with DT to provide them just assume that a DT enabled
3763          * system has full constraints.
3764          */
3765         if (of_have_populated_dt())
3766                 has_full_constraints = true;
3767
3768         mutex_lock(&regulator_list_mutex);
3769
3770         /* If we have a full configuration then disable any regulators
3771          * which are not in use or always_on.  This will become the
3772          * default behaviour in the future.
3773          */
3774         list_for_each_entry(rdev, &regulator_list, list) {
3775                 ops = rdev->desc->ops;
3776                 c = rdev->constraints;
3777
3778                 if (!ops->disable || (c && c->always_on))
3779                         continue;
3780
3781                 mutex_lock(&rdev->mutex);
3782
3783                 if (rdev->use_count)
3784                         goto unlock;
3785
3786                 /* If we can't read the status assume it's on. */
3787                 if (ops->is_enabled)
3788                         enabled = ops->is_enabled(rdev);
3789                 else
3790                         enabled = 1;
3791
3792                 if (!enabled)
3793                         goto unlock;
3794
3795                 if (has_full_constraints) {
3796                         /* We log since this may kill the system if it
3797                          * goes wrong. */
3798                         rdev_info(rdev, "disabling\n");
3799                         ret = ops->disable(rdev);
3800                         if (ret != 0) {
3801                                 rdev_err(rdev, "couldn't disable: %d\n", ret);
3802                         }
3803                 } else {
3804                         /* The intention is that in future we will
3805                          * assume that full constraints are provided
3806                          * so warn even if we aren't going to do
3807                          * anything here.
3808                          */
3809                         rdev_warn(rdev, "incomplete constraints, leaving on\n");
3810                 }
3811
3812 unlock:
3813                 mutex_unlock(&rdev->mutex);
3814         }
3815
3816         mutex_unlock(&regulator_list_mutex);
3817
3818         return 0;
3819 }
3820 late_initcall(regulator_init_complete);