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         ret = regulator_count_voltages(regulator);
2011         if (ret < 0)
2012                 return ret;
2013         voltages = ret;
2014
2015         for (i = 0; i < voltages; i++) {
2016                 ret = regulator_list_voltage(regulator, i);
2017
2018                 if (ret >= min_uV && ret <= max_uV)
2019                         return 1;
2020         }
2021
2022         return 0;
2023 }
2024 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2025
2026 /**
2027  * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
2028  *
2029  * @rdev: regulator to operate on
2030  *
2031  * Regulators that use regmap for their register I/O can set the
2032  * vsel_reg and vsel_mask fields in their descriptor and then use this
2033  * as their get_voltage_vsel operation, saving some code.
2034  */
2035 int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
2036 {
2037         unsigned int val;
2038         int ret;
2039
2040         ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
2041         if (ret != 0)
2042                 return ret;
2043
2044         val &= rdev->desc->vsel_mask;
2045         val >>= ffs(rdev->desc->vsel_mask) - 1;
2046
2047         return val;
2048 }
2049 EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
2050
2051 /**
2052  * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
2053  *
2054  * @rdev: regulator to operate on
2055  * @sel: Selector to set
2056  *
2057  * Regulators that use regmap for their register I/O can set the
2058  * vsel_reg and vsel_mask fields in their descriptor and then use this
2059  * as their set_voltage_vsel operation, saving some code.
2060  */
2061 int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2062 {
2063         sel <<= ffs(rdev->desc->vsel_mask) - 1;
2064
2065         return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2066                                   rdev->desc->vsel_mask, sel);
2067 }
2068 EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2069
2070 /**
2071  * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2072  *
2073  * @rdev: Regulator to operate on
2074  * @min_uV: Lower bound for voltage
2075  * @max_uV: Upper bound for voltage
2076  *
2077  * Drivers implementing set_voltage_sel() and list_voltage() can use
2078  * this as their map_voltage() operation.  It will find a suitable
2079  * voltage by calling list_voltage() until it gets something in bounds
2080  * for the requested voltages.
2081  */
2082 int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2083                                   int min_uV, int max_uV)
2084 {
2085         int best_val = INT_MAX;
2086         int selector = 0;
2087         int i, ret;
2088
2089         /* Find the smallest voltage that falls within the specified
2090          * range.
2091          */
2092         for (i = 0; i < rdev->desc->n_voltages; i++) {
2093                 ret = rdev->desc->ops->list_voltage(rdev, i);
2094                 if (ret < 0)
2095                         continue;
2096
2097                 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2098                         best_val = ret;
2099                         selector = i;
2100                 }
2101         }
2102
2103         if (best_val != INT_MAX)
2104                 return selector;
2105         else
2106                 return -EINVAL;
2107 }
2108 EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2109
2110 /**
2111  * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2112  *
2113  * @rdev: Regulator to operate on
2114  * @min_uV: Lower bound for voltage
2115  * @max_uV: Upper bound for voltage
2116  *
2117  * Drivers providing min_uV and uV_step in their regulator_desc can
2118  * use this as their map_voltage() operation.
2119  */
2120 int regulator_map_voltage_linear(struct regulator_dev *rdev,
2121                                  int min_uV, int max_uV)
2122 {
2123         int ret, voltage;
2124
2125         /* Allow uV_step to be 0 for fixed voltage */
2126         if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2127                 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2128                         return 0;
2129                 else
2130                         return -EINVAL;
2131         }
2132
2133         if (!rdev->desc->uV_step) {
2134                 BUG_ON(!rdev->desc->uV_step);
2135                 return -EINVAL;
2136         }
2137
2138         if (min_uV < rdev->desc->min_uV)
2139                 min_uV = rdev->desc->min_uV;
2140
2141         ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
2142         if (ret < 0)
2143                 return ret;
2144
2145         /* Map back into a voltage to verify we're still in bounds */
2146         voltage = rdev->desc->ops->list_voltage(rdev, ret);
2147         if (voltage < min_uV || voltage > max_uV)
2148                 return -EINVAL;
2149
2150         return ret;
2151 }
2152 EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2153
2154 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2155                                      int min_uV, int max_uV)
2156 {
2157         int ret;
2158         int delay = 0;
2159         int best_val = 0;
2160         unsigned int selector;
2161         int old_selector = -1;
2162
2163         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2164
2165         min_uV += rdev->constraints->uV_offset;
2166         max_uV += rdev->constraints->uV_offset;
2167
2168         /*
2169          * If we can't obtain the old selector there is not enough
2170          * info to call set_voltage_time_sel().
2171          */
2172         if (_regulator_is_enabled(rdev) &&
2173             rdev->desc->ops->set_voltage_time_sel &&
2174             rdev->desc->ops->get_voltage_sel) {
2175                 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2176                 if (old_selector < 0)
2177                         return old_selector;
2178         }
2179
2180         if (rdev->desc->ops->set_voltage) {
2181                 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2182                                                    &selector);
2183
2184                 if (ret >= 0) {
2185                         if (rdev->desc->ops->list_voltage)
2186                                 best_val = rdev->desc->ops->list_voltage(rdev,
2187                                                                          selector);
2188                         else
2189                                 best_val = _regulator_get_voltage(rdev);
2190                 }
2191
2192         } else if (rdev->desc->ops->set_voltage_sel) {
2193                 if (rdev->desc->ops->map_voltage) {
2194                         ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2195                                                            max_uV);
2196                 } else {
2197                         if (rdev->desc->ops->list_voltage ==
2198                             regulator_list_voltage_linear)
2199                                 ret = regulator_map_voltage_linear(rdev,
2200                                                                 min_uV, max_uV);
2201                         else
2202                                 ret = regulator_map_voltage_iterate(rdev,
2203                                                                 min_uV, max_uV);
2204                 }
2205
2206                 if (ret >= 0) {
2207                         best_val = rdev->desc->ops->list_voltage(rdev, ret);
2208                         if (min_uV <= best_val && max_uV >= best_val) {
2209                                 selector = ret;
2210                                 ret = rdev->desc->ops->set_voltage_sel(rdev,
2211                                                                        ret);
2212                         } else {
2213                                 ret = -EINVAL;
2214                         }
2215                 }
2216         } else {
2217                 ret = -EINVAL;
2218         }
2219
2220         /* Call set_voltage_time_sel if successfully obtained old_selector */
2221         if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
2222             rdev->desc->ops->set_voltage_time_sel) {
2223
2224                 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2225                                                 old_selector, selector);
2226                 if (delay < 0) {
2227                         rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2228                                   delay);
2229                         delay = 0;
2230                 }
2231
2232                 /* Insert any necessary delays */
2233                 if (delay >= 1000) {
2234                         mdelay(delay / 1000);
2235                         udelay(delay % 1000);
2236                 } else if (delay) {
2237                         udelay(delay);
2238                 }
2239         }
2240
2241         if (ret == 0 && best_val >= 0) {
2242                 unsigned long data = best_val;
2243
2244                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2245                                      (void *)data);
2246         }
2247
2248         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2249
2250         return ret;
2251 }
2252
2253 /**
2254  * regulator_set_voltage - set regulator output voltage
2255  * @regulator: regulator source
2256  * @min_uV: Minimum required voltage in uV
2257  * @max_uV: Maximum acceptable voltage in uV
2258  *
2259  * Sets a voltage regulator to the desired output voltage. This can be set
2260  * during any regulator state. IOW, regulator can be disabled or enabled.
2261  *
2262  * If the regulator is enabled then the voltage will change to the new value
2263  * immediately otherwise if the regulator is disabled the regulator will
2264  * output at the new voltage when enabled.
2265  *
2266  * NOTE: If the regulator is shared between several devices then the lowest
2267  * request voltage that meets the system constraints will be used.
2268  * Regulator system constraints must be set for this regulator before
2269  * calling this function otherwise this call will fail.
2270  */
2271 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2272 {
2273         struct regulator_dev *rdev = regulator->rdev;
2274         int ret = 0;
2275
2276         mutex_lock(&rdev->mutex);
2277
2278         /* If we're setting the same range as last time the change
2279          * should be a noop (some cpufreq implementations use the same
2280          * voltage for multiple frequencies, for example).
2281          */
2282         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2283                 goto out;
2284
2285         /* sanity check */
2286         if (!rdev->desc->ops->set_voltage &&
2287             !rdev->desc->ops->set_voltage_sel) {
2288                 ret = -EINVAL;
2289                 goto out;
2290         }
2291
2292         /* constraints check */
2293         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2294         if (ret < 0)
2295                 goto out;
2296         regulator->min_uV = min_uV;
2297         regulator->max_uV = max_uV;
2298
2299         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2300         if (ret < 0)
2301                 goto out;
2302
2303         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2304
2305 out:
2306         mutex_unlock(&rdev->mutex);
2307         return ret;
2308 }
2309 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2310
2311 /**
2312  * regulator_set_voltage_time - get raise/fall time
2313  * @regulator: regulator source
2314  * @old_uV: starting voltage in microvolts
2315  * @new_uV: target voltage in microvolts
2316  *
2317  * Provided with the starting and ending voltage, this function attempts to
2318  * calculate the time in microseconds required to rise or fall to this new
2319  * voltage.
2320  */
2321 int regulator_set_voltage_time(struct regulator *regulator,
2322                                int old_uV, int new_uV)
2323 {
2324         struct regulator_dev    *rdev = regulator->rdev;
2325         struct regulator_ops    *ops = rdev->desc->ops;
2326         int old_sel = -1;
2327         int new_sel = -1;
2328         int voltage;
2329         int i;
2330
2331         /* Currently requires operations to do this */
2332         if (!ops->list_voltage || !ops->set_voltage_time_sel
2333             || !rdev->desc->n_voltages)
2334                 return -EINVAL;
2335
2336         for (i = 0; i < rdev->desc->n_voltages; i++) {
2337                 /* We only look for exact voltage matches here */
2338                 voltage = regulator_list_voltage(regulator, i);
2339                 if (voltage < 0)
2340                         return -EINVAL;
2341                 if (voltage == 0)
2342                         continue;
2343                 if (voltage == old_uV)
2344                         old_sel = i;
2345                 if (voltage == new_uV)
2346                         new_sel = i;
2347         }
2348
2349         if (old_sel < 0 || new_sel < 0)
2350                 return -EINVAL;
2351
2352         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2353 }
2354 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2355
2356 /**
2357  * regulator_set_voltage_time_sel - get raise/fall time
2358  * @rdev: regulator source device
2359  * @old_selector: selector for starting voltage
2360  * @new_selector: selector for target voltage
2361  *
2362  * Provided with the starting and target voltage selectors, this function
2363  * returns time in microseconds required to rise or fall to this new voltage
2364  *
2365  * Drivers providing ramp_delay in regulation_constraints can use this as their
2366  * set_voltage_time_sel() operation.
2367  */
2368 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2369                                    unsigned int old_selector,
2370                                    unsigned int new_selector)
2371 {
2372         unsigned int ramp_delay = 0;
2373         int old_volt, new_volt;
2374
2375         if (rdev->constraints->ramp_delay)
2376                 ramp_delay = rdev->constraints->ramp_delay;
2377         else if (rdev->desc->ramp_delay)
2378                 ramp_delay = rdev->desc->ramp_delay;
2379
2380         if (ramp_delay == 0) {
2381                 rdev_warn(rdev, "ramp_delay not set\n");
2382                 return 0;
2383         }
2384
2385         /* sanity check */
2386         if (!rdev->desc->ops->list_voltage)
2387                 return -EINVAL;
2388
2389         old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2390         new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2391
2392         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2393 }
2394 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2395
2396 /**
2397  * regulator_sync_voltage - re-apply last regulator output voltage
2398  * @regulator: regulator source
2399  *
2400  * Re-apply the last configured voltage.  This is intended to be used
2401  * where some external control source the consumer is cooperating with
2402  * has caused the configured voltage to change.
2403  */
2404 int regulator_sync_voltage(struct regulator *regulator)
2405 {
2406         struct regulator_dev *rdev = regulator->rdev;
2407         int ret, min_uV, max_uV;
2408
2409         mutex_lock(&rdev->mutex);
2410
2411         if (!rdev->desc->ops->set_voltage &&
2412             !rdev->desc->ops->set_voltage_sel) {
2413                 ret = -EINVAL;
2414                 goto out;
2415         }
2416
2417         /* This is only going to work if we've had a voltage configured. */
2418         if (!regulator->min_uV && !regulator->max_uV) {
2419                 ret = -EINVAL;
2420                 goto out;
2421         }
2422
2423         min_uV = regulator->min_uV;
2424         max_uV = regulator->max_uV;
2425
2426         /* This should be a paranoia check... */
2427         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2428         if (ret < 0)
2429                 goto out;
2430
2431         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2432         if (ret < 0)
2433                 goto out;
2434
2435         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2436
2437 out:
2438         mutex_unlock(&rdev->mutex);
2439         return ret;
2440 }
2441 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2442
2443 static int _regulator_get_voltage(struct regulator_dev *rdev)
2444 {
2445         int sel, ret;
2446
2447         if (rdev->desc->ops->get_voltage_sel) {
2448                 sel = rdev->desc->ops->get_voltage_sel(rdev);
2449                 if (sel < 0)
2450                         return sel;
2451                 ret = rdev->desc->ops->list_voltage(rdev, sel);
2452         } else if (rdev->desc->ops->get_voltage) {
2453                 ret = rdev->desc->ops->get_voltage(rdev);
2454         } else if (rdev->desc->ops->list_voltage) {
2455                 ret = rdev->desc->ops->list_voltage(rdev, 0);
2456         } else {
2457                 return -EINVAL;
2458         }
2459
2460         if (ret < 0)
2461                 return ret;
2462         return ret - rdev->constraints->uV_offset;
2463 }
2464
2465 /**
2466  * regulator_get_voltage - get regulator output voltage
2467  * @regulator: regulator source
2468  *
2469  * This returns the current regulator voltage in uV.
2470  *
2471  * NOTE: If the regulator is disabled it will return the voltage value. This
2472  * function should not be used to determine regulator state.
2473  */
2474 int regulator_get_voltage(struct regulator *regulator)
2475 {
2476         int ret;
2477
2478         mutex_lock(&regulator->rdev->mutex);
2479
2480         ret = _regulator_get_voltage(regulator->rdev);
2481
2482         mutex_unlock(&regulator->rdev->mutex);
2483
2484         return ret;
2485 }
2486 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2487
2488 /**
2489  * regulator_set_current_limit - set regulator output current limit
2490  * @regulator: regulator source
2491  * @min_uA: Minimuum supported current in uA
2492  * @max_uA: Maximum supported current in uA
2493  *
2494  * Sets current sink to the desired output current. This can be set during
2495  * any regulator state. IOW, regulator can be disabled or enabled.
2496  *
2497  * If the regulator is enabled then the current will change to the new value
2498  * immediately otherwise if the regulator is disabled the regulator will
2499  * output at the new current when enabled.
2500  *
2501  * NOTE: Regulator system constraints must be set for this regulator before
2502  * calling this function otherwise this call will fail.
2503  */
2504 int regulator_set_current_limit(struct regulator *regulator,
2505                                int min_uA, int max_uA)
2506 {
2507         struct regulator_dev *rdev = regulator->rdev;
2508         int ret;
2509
2510         mutex_lock(&rdev->mutex);
2511
2512         /* sanity check */
2513         if (!rdev->desc->ops->set_current_limit) {
2514                 ret = -EINVAL;
2515                 goto out;
2516         }
2517
2518         /* constraints check */
2519         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2520         if (ret < 0)
2521                 goto out;
2522
2523         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2524 out:
2525         mutex_unlock(&rdev->mutex);
2526         return ret;
2527 }
2528 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2529
2530 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2531 {
2532         int ret;
2533
2534         mutex_lock(&rdev->mutex);
2535
2536         /* sanity check */
2537         if (!rdev->desc->ops->get_current_limit) {
2538                 ret = -EINVAL;
2539                 goto out;
2540         }
2541
2542         ret = rdev->desc->ops->get_current_limit(rdev);
2543 out:
2544         mutex_unlock(&rdev->mutex);
2545         return ret;
2546 }
2547
2548 /**
2549  * regulator_get_current_limit - get regulator output current
2550  * @regulator: regulator source
2551  *
2552  * This returns the current supplied by the specified current sink in uA.
2553  *
2554  * NOTE: If the regulator is disabled it will return the current value. This
2555  * function should not be used to determine regulator state.
2556  */
2557 int regulator_get_current_limit(struct regulator *regulator)
2558 {
2559         return _regulator_get_current_limit(regulator->rdev);
2560 }
2561 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2562
2563 /**
2564  * regulator_set_mode - set regulator operating mode
2565  * @regulator: regulator source
2566  * @mode: operating mode - one of the REGULATOR_MODE constants
2567  *
2568  * Set regulator operating mode to increase regulator efficiency or improve
2569  * regulation performance.
2570  *
2571  * NOTE: Regulator system constraints must be set for this regulator before
2572  * calling this function otherwise this call will fail.
2573  */
2574 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2575 {
2576         struct regulator_dev *rdev = regulator->rdev;
2577         int ret;
2578         int regulator_curr_mode;
2579
2580         mutex_lock(&rdev->mutex);
2581
2582         /* sanity check */
2583         if (!rdev->desc->ops->set_mode) {
2584                 ret = -EINVAL;
2585                 goto out;
2586         }
2587
2588         /* return if the same mode is requested */
2589         if (rdev->desc->ops->get_mode) {
2590                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2591                 if (regulator_curr_mode == mode) {
2592                         ret = 0;
2593                         goto out;
2594                 }
2595         }
2596
2597         /* constraints check */
2598         ret = regulator_mode_constrain(rdev, &mode);
2599         if (ret < 0)
2600                 goto out;
2601
2602         ret = rdev->desc->ops->set_mode(rdev, mode);
2603 out:
2604         mutex_unlock(&rdev->mutex);
2605         return ret;
2606 }
2607 EXPORT_SYMBOL_GPL(regulator_set_mode);
2608
2609 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2610 {
2611         int ret;
2612
2613         mutex_lock(&rdev->mutex);
2614
2615         /* sanity check */
2616         if (!rdev->desc->ops->get_mode) {
2617                 ret = -EINVAL;
2618                 goto out;
2619         }
2620
2621         ret = rdev->desc->ops->get_mode(rdev);
2622 out:
2623         mutex_unlock(&rdev->mutex);
2624         return ret;
2625 }
2626
2627 /**
2628  * regulator_get_mode - get regulator operating mode
2629  * @regulator: regulator source
2630  *
2631  * Get the current regulator operating mode.
2632  */
2633 unsigned int regulator_get_mode(struct regulator *regulator)
2634 {
2635         return _regulator_get_mode(regulator->rdev);
2636 }
2637 EXPORT_SYMBOL_GPL(regulator_get_mode);
2638
2639 /**
2640  * regulator_set_optimum_mode - set regulator optimum operating mode
2641  * @regulator: regulator source
2642  * @uA_load: load current
2643  *
2644  * Notifies the regulator core of a new device load. This is then used by
2645  * DRMS (if enabled by constraints) to set the most efficient regulator
2646  * operating mode for the new regulator loading.
2647  *
2648  * Consumer devices notify their supply regulator of the maximum power
2649  * they will require (can be taken from device datasheet in the power
2650  * consumption tables) when they change operational status and hence power
2651  * state. Examples of operational state changes that can affect power
2652  * consumption are :-
2653  *
2654  *    o Device is opened / closed.
2655  *    o Device I/O is about to begin or has just finished.
2656  *    o Device is idling in between work.
2657  *
2658  * This information is also exported via sysfs to userspace.
2659  *
2660  * DRMS will sum the total requested load on the regulator and change
2661  * to the most efficient operating mode if platform constraints allow.
2662  *
2663  * Returns the new regulator mode or error.
2664  */
2665 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2666 {
2667         struct regulator_dev *rdev = regulator->rdev;
2668         struct regulator *consumer;
2669         int ret, output_uV, input_uV = 0, total_uA_load = 0;
2670         unsigned int mode;
2671
2672         if (rdev->supply)
2673                 input_uV = regulator_get_voltage(rdev->supply);
2674
2675         mutex_lock(&rdev->mutex);
2676
2677         /*
2678          * first check to see if we can set modes at all, otherwise just
2679          * tell the consumer everything is OK.
2680          */
2681         regulator->uA_load = uA_load;
2682         ret = regulator_check_drms(rdev);
2683         if (ret < 0) {
2684                 ret = 0;
2685                 goto out;
2686         }
2687
2688         if (!rdev->desc->ops->get_optimum_mode)
2689                 goto out;
2690
2691         /*
2692          * we can actually do this so any errors are indicators of
2693          * potential real failure.
2694          */
2695         ret = -EINVAL;
2696
2697         if (!rdev->desc->ops->set_mode)
2698                 goto out;
2699
2700         /* get output voltage */
2701         output_uV = _regulator_get_voltage(rdev);
2702         if (output_uV <= 0) {
2703                 rdev_err(rdev, "invalid output voltage found\n");
2704                 goto out;
2705         }
2706
2707         /* No supply? Use constraint voltage */
2708         if (input_uV <= 0)
2709                 input_uV = rdev->constraints->input_uV;
2710         if (input_uV <= 0) {
2711                 rdev_err(rdev, "invalid input voltage found\n");
2712                 goto out;
2713         }
2714
2715         /* calc total requested load for this regulator */
2716         list_for_each_entry(consumer, &rdev->consumer_list, list)
2717                 total_uA_load += consumer->uA_load;
2718
2719         mode = rdev->desc->ops->get_optimum_mode(rdev,
2720                                                  input_uV, output_uV,
2721                                                  total_uA_load);
2722         ret = regulator_mode_constrain(rdev, &mode);
2723         if (ret < 0) {
2724                 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2725                          total_uA_load, input_uV, output_uV);
2726                 goto out;
2727         }
2728
2729         ret = rdev->desc->ops->set_mode(rdev, mode);
2730         if (ret < 0) {
2731                 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2732                 goto out;
2733         }
2734         ret = mode;
2735 out:
2736         mutex_unlock(&rdev->mutex);
2737         return ret;
2738 }
2739 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2740
2741 /**
2742  * regulator_set_bypass_regmap - Default set_bypass() using regmap
2743  *
2744  * @rdev: device to operate on.
2745  * @enable: state to set.
2746  */
2747 int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
2748 {
2749         unsigned int val;
2750
2751         if (enable)
2752                 val = rdev->desc->bypass_mask;
2753         else
2754                 val = 0;
2755
2756         return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
2757                                   rdev->desc->bypass_mask, val);
2758 }
2759 EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
2760
2761 /**
2762  * regulator_get_bypass_regmap - Default get_bypass() using regmap
2763  *
2764  * @rdev: device to operate on.
2765  * @enable: current state.
2766  */
2767 int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
2768 {
2769         unsigned int val;
2770         int ret;
2771
2772         ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
2773         if (ret != 0)
2774                 return ret;
2775
2776         *enable = val & rdev->desc->bypass_mask;
2777
2778         return 0;
2779 }
2780 EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
2781
2782 /**
2783  * regulator_allow_bypass - allow the regulator to go into bypass mode
2784  *
2785  * @regulator: Regulator to configure
2786  * @allow: enable or disable bypass mode
2787  *
2788  * Allow the regulator to go into bypass mode if all other consumers
2789  * for the regulator also enable bypass mode and the machine
2790  * constraints allow this.  Bypass mode means that the regulator is
2791  * simply passing the input directly to the output with no regulation.
2792  */
2793 int regulator_allow_bypass(struct regulator *regulator, bool enable)
2794 {
2795         struct regulator_dev *rdev = regulator->rdev;
2796         int ret = 0;
2797
2798         if (!rdev->desc->ops->set_bypass)
2799                 return 0;
2800
2801         if (rdev->constraints &&
2802             !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2803                 return 0;
2804
2805         mutex_lock(&rdev->mutex);
2806
2807         if (enable && !regulator->bypass) {
2808                 rdev->bypass_count++;
2809
2810                 if (rdev->bypass_count == rdev->open_count) {
2811                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2812                         if (ret != 0)
2813                                 rdev->bypass_count--;
2814                 }
2815
2816         } else if (!enable && regulator->bypass) {
2817                 rdev->bypass_count--;
2818
2819                 if (rdev->bypass_count != rdev->open_count) {
2820                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2821                         if (ret != 0)
2822                                 rdev->bypass_count++;
2823                 }
2824         }
2825
2826         if (ret == 0)
2827                 regulator->bypass = enable;
2828
2829         mutex_unlock(&rdev->mutex);
2830
2831         return ret;
2832 }
2833 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2834
2835 /**
2836  * regulator_register_notifier - register regulator event notifier
2837  * @regulator: regulator source
2838  * @nb: notifier block
2839  *
2840  * Register notifier block to receive regulator events.
2841  */
2842 int regulator_register_notifier(struct regulator *regulator,
2843                               struct notifier_block *nb)
2844 {
2845         return blocking_notifier_chain_register(&regulator->rdev->notifier,
2846                                                 nb);
2847 }
2848 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2849
2850 /**
2851  * regulator_unregister_notifier - unregister regulator event notifier
2852  * @regulator: regulator source
2853  * @nb: notifier block
2854  *
2855  * Unregister regulator event notifier block.
2856  */
2857 int regulator_unregister_notifier(struct regulator *regulator,
2858                                 struct notifier_block *nb)
2859 {
2860         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2861                                                   nb);
2862 }
2863 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2864
2865 /* notify regulator consumers and downstream regulator consumers.
2866  * Note mutex must be held by caller.
2867  */
2868 static void _notifier_call_chain(struct regulator_dev *rdev,
2869                                   unsigned long event, void *data)
2870 {
2871         /* call rdev chain first */
2872         blocking_notifier_call_chain(&rdev->notifier, event, data);
2873 }
2874
2875 /**
2876  * regulator_bulk_get - get multiple regulator consumers
2877  *
2878  * @dev:           Device to supply
2879  * @num_consumers: Number of consumers to register
2880  * @consumers:     Configuration of consumers; clients are stored here.
2881  *
2882  * @return 0 on success, an errno on failure.
2883  *
2884  * This helper function allows drivers to get several regulator
2885  * consumers in one operation.  If any of the regulators cannot be
2886  * acquired then any regulators that were allocated will be freed
2887  * before returning to the caller.
2888  */
2889 int regulator_bulk_get(struct device *dev, int num_consumers,
2890                        struct regulator_bulk_data *consumers)
2891 {
2892         int i;
2893         int ret;
2894
2895         for (i = 0; i < num_consumers; i++)
2896                 consumers[i].consumer = NULL;
2897
2898         for (i = 0; i < num_consumers; i++) {
2899                 consumers[i].consumer = regulator_get(dev,
2900                                                       consumers[i].supply);
2901                 if (IS_ERR(consumers[i].consumer)) {
2902                         ret = PTR_ERR(consumers[i].consumer);
2903                         dev_err(dev, "Failed to get supply '%s': %d\n",
2904                                 consumers[i].supply, ret);
2905                         consumers[i].consumer = NULL;
2906                         goto err;
2907                 }
2908         }
2909
2910         return 0;
2911
2912 err:
2913         while (--i >= 0)
2914                 regulator_put(consumers[i].consumer);
2915
2916         return ret;
2917 }
2918 EXPORT_SYMBOL_GPL(regulator_bulk_get);
2919
2920 /**
2921  * devm_regulator_bulk_get - managed get multiple regulator consumers
2922  *
2923  * @dev:           Device to supply
2924  * @num_consumers: Number of consumers to register
2925  * @consumers:     Configuration of consumers; clients are stored here.
2926  *
2927  * @return 0 on success, an errno on failure.
2928  *
2929  * This helper function allows drivers to get several regulator
2930  * consumers in one operation with management, the regulators will
2931  * automatically be freed when the device is unbound.  If any of the
2932  * regulators cannot be acquired then any regulators that were
2933  * allocated will be freed before returning to the caller.
2934  */
2935 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2936                             struct regulator_bulk_data *consumers)
2937 {
2938         int i;
2939         int ret;
2940
2941         for (i = 0; i < num_consumers; i++)
2942                 consumers[i].consumer = NULL;
2943
2944         for (i = 0; i < num_consumers; i++) {
2945                 consumers[i].consumer = devm_regulator_get(dev,
2946                                                            consumers[i].supply);
2947                 if (IS_ERR(consumers[i].consumer)) {
2948                         ret = PTR_ERR(consumers[i].consumer);
2949                         dev_err(dev, "Failed to get supply '%s': %d\n",
2950                                 consumers[i].supply, ret);
2951                         consumers[i].consumer = NULL;
2952                         goto err;
2953                 }
2954         }
2955
2956         return 0;
2957
2958 err:
2959         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2960                 devm_regulator_put(consumers[i].consumer);
2961
2962         return ret;
2963 }
2964 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2965
2966 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2967 {
2968         struct regulator_bulk_data *bulk = data;
2969
2970         bulk->ret = regulator_enable(bulk->consumer);
2971 }
2972
2973 /**
2974  * regulator_bulk_enable - enable multiple regulator consumers
2975  *
2976  * @num_consumers: Number of consumers
2977  * @consumers:     Consumer data; clients are stored here.
2978  * @return         0 on success, an errno on failure
2979  *
2980  * This convenience API allows consumers to enable multiple regulator
2981  * clients in a single API call.  If any consumers cannot be enabled
2982  * then any others that were enabled will be disabled again prior to
2983  * return.
2984  */
2985 int regulator_bulk_enable(int num_consumers,
2986                           struct regulator_bulk_data *consumers)
2987 {
2988         ASYNC_DOMAIN_EXCLUSIVE(async_domain);
2989         int i;
2990         int ret = 0;
2991
2992         for (i = 0; i < num_consumers; i++) {
2993                 if (consumers[i].consumer->always_on)
2994                         consumers[i].ret = 0;
2995                 else
2996                         async_schedule_domain(regulator_bulk_enable_async,
2997                                               &consumers[i], &async_domain);
2998         }
2999
3000         async_synchronize_full_domain(&async_domain);
3001
3002         /* If any consumer failed we need to unwind any that succeeded */
3003         for (i = 0; i < num_consumers; i++) {
3004                 if (consumers[i].ret != 0) {
3005                         ret = consumers[i].ret;
3006                         goto err;
3007                 }
3008         }
3009
3010         return 0;
3011
3012 err:
3013         pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
3014         while (--i >= 0)
3015                 regulator_disable(consumers[i].consumer);
3016
3017         return ret;
3018 }
3019 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3020
3021 /**
3022  * regulator_bulk_disable - disable multiple regulator consumers
3023  *
3024  * @num_consumers: Number of consumers
3025  * @consumers:     Consumer data; clients are stored here.
3026  * @return         0 on success, an errno on failure
3027  *
3028  * This convenience API allows consumers to disable multiple regulator
3029  * clients in a single API call.  If any consumers cannot be disabled
3030  * then any others that were disabled will be enabled again prior to
3031  * return.
3032  */
3033 int regulator_bulk_disable(int num_consumers,
3034                            struct regulator_bulk_data *consumers)
3035 {
3036         int i;
3037         int ret, r;
3038
3039         for (i = num_consumers - 1; i >= 0; --i) {
3040                 ret = regulator_disable(consumers[i].consumer);
3041                 if (ret != 0)
3042                         goto err;
3043         }
3044
3045         return 0;
3046
3047 err:
3048         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3049         for (++i; i < num_consumers; ++i) {
3050                 r = regulator_enable(consumers[i].consumer);
3051                 if (r != 0)
3052                         pr_err("Failed to reename %s: %d\n",
3053                                consumers[i].supply, r);
3054         }
3055
3056         return ret;
3057 }
3058 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3059
3060 /**
3061  * regulator_bulk_force_disable - force disable multiple regulator consumers
3062  *
3063  * @num_consumers: Number of consumers
3064  * @consumers:     Consumer data; clients are stored here.
3065  * @return         0 on success, an errno on failure
3066  *
3067  * This convenience API allows consumers to forcibly disable multiple regulator
3068  * clients in a single API call.
3069  * NOTE: This should be used for situations when device damage will
3070  * likely occur if the regulators are not disabled (e.g. over temp).
3071  * Although regulator_force_disable function call for some consumers can
3072  * return error numbers, the function is called for all consumers.
3073  */
3074 int regulator_bulk_force_disable(int num_consumers,
3075                            struct regulator_bulk_data *consumers)
3076 {
3077         int i;
3078         int ret;
3079
3080         for (i = 0; i < num_consumers; i++)
3081                 consumers[i].ret =
3082                             regulator_force_disable(consumers[i].consumer);
3083
3084         for (i = 0; i < num_consumers; i++) {
3085                 if (consumers[i].ret != 0) {
3086                         ret = consumers[i].ret;
3087                         goto out;
3088                 }
3089         }
3090
3091         return 0;
3092 out:
3093         return ret;
3094 }
3095 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3096
3097 /**
3098  * regulator_bulk_free - free multiple regulator consumers
3099  *
3100  * @num_consumers: Number of consumers
3101  * @consumers:     Consumer data; clients are stored here.
3102  *
3103  * This convenience API allows consumers to free multiple regulator
3104  * clients in a single API call.
3105  */
3106 void regulator_bulk_free(int num_consumers,
3107                          struct regulator_bulk_data *consumers)
3108 {
3109         int i;
3110
3111         for (i = 0; i < num_consumers; i++) {
3112                 regulator_put(consumers[i].consumer);
3113                 consumers[i].consumer = NULL;
3114         }
3115 }
3116 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3117
3118 /**
3119  * regulator_notifier_call_chain - call regulator event notifier
3120  * @rdev: regulator source
3121  * @event: notifier block
3122  * @data: callback-specific data.
3123  *
3124  * Called by regulator drivers to notify clients a regulator event has
3125  * occurred. We also notify regulator clients downstream.
3126  * Note lock must be held by caller.
3127  */
3128 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3129                                   unsigned long event, void *data)
3130 {
3131         _notifier_call_chain(rdev, event, data);
3132         return NOTIFY_DONE;
3133
3134 }
3135 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3136
3137 /**
3138  * regulator_mode_to_status - convert a regulator mode into a status
3139  *
3140  * @mode: Mode to convert
3141  *
3142  * Convert a regulator mode into a status.
3143  */
3144 int regulator_mode_to_status(unsigned int mode)
3145 {
3146         switch (mode) {
3147         case REGULATOR_MODE_FAST:
3148                 return REGULATOR_STATUS_FAST;
3149         case REGULATOR_MODE_NORMAL:
3150                 return REGULATOR_STATUS_NORMAL;
3151         case REGULATOR_MODE_IDLE:
3152                 return REGULATOR_STATUS_IDLE;
3153         case REGULATOR_MODE_STANDBY:
3154                 return REGULATOR_STATUS_STANDBY;
3155         default:
3156                 return REGULATOR_STATUS_UNDEFINED;
3157         }
3158 }
3159 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3160
3161 /*
3162  * To avoid cluttering sysfs (and memory) with useless state, only
3163  * create attributes that can be meaningfully displayed.
3164  */
3165 static int add_regulator_attributes(struct regulator_dev *rdev)
3166 {
3167         struct device           *dev = &rdev->dev;
3168         struct regulator_ops    *ops = rdev->desc->ops;
3169         int                     status = 0;
3170
3171         /* some attributes need specific methods to be displayed */
3172         if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3173             (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3174             (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0)) {
3175                 status = device_create_file(dev, &dev_attr_microvolts);
3176                 if (status < 0)
3177                         return status;
3178         }
3179         if (ops->get_current_limit) {
3180                 status = device_create_file(dev, &dev_attr_microamps);
3181                 if (status < 0)
3182                         return status;
3183         }
3184         if (ops->get_mode) {
3185                 status = device_create_file(dev, &dev_attr_opmode);
3186                 if (status < 0)
3187                         return status;
3188         }
3189         if (ops->is_enabled) {
3190                 status = device_create_file(dev, &dev_attr_state);
3191                 if (status < 0)
3192                         return status;
3193         }
3194         if (ops->get_status) {
3195                 status = device_create_file(dev, &dev_attr_status);
3196                 if (status < 0)
3197                         return status;
3198         }
3199         if (ops->get_bypass) {
3200                 status = device_create_file(dev, &dev_attr_bypass);
3201                 if (status < 0)
3202                         return status;
3203         }
3204
3205         /* some attributes are type-specific */
3206         if (rdev->desc->type == REGULATOR_CURRENT) {
3207                 status = device_create_file(dev, &dev_attr_requested_microamps);
3208                 if (status < 0)
3209                         return status;
3210         }
3211
3212         /* all the other attributes exist to support constraints;
3213          * don't show them if there are no constraints, or if the
3214          * relevant supporting methods are missing.
3215          */
3216         if (!rdev->constraints)
3217                 return status;
3218
3219         /* constraints need specific supporting methods */
3220         if (ops->set_voltage || ops->set_voltage_sel) {
3221                 status = device_create_file(dev, &dev_attr_min_microvolts);
3222                 if (status < 0)
3223                         return status;
3224                 status = device_create_file(dev, &dev_attr_max_microvolts);
3225                 if (status < 0)
3226                         return status;
3227         }
3228         if (ops->set_current_limit) {
3229                 status = device_create_file(dev, &dev_attr_min_microamps);
3230                 if (status < 0)
3231                         return status;
3232                 status = device_create_file(dev, &dev_attr_max_microamps);
3233                 if (status < 0)
3234                         return status;
3235         }
3236
3237         status = device_create_file(dev, &dev_attr_suspend_standby_state);
3238         if (status < 0)
3239                 return status;
3240         status = device_create_file(dev, &dev_attr_suspend_mem_state);
3241         if (status < 0)
3242                 return status;
3243         status = device_create_file(dev, &dev_attr_suspend_disk_state);
3244         if (status < 0)
3245                 return status;
3246
3247         if (ops->set_suspend_voltage) {
3248                 status = device_create_file(dev,
3249                                 &dev_attr_suspend_standby_microvolts);
3250                 if (status < 0)
3251                         return status;
3252                 status = device_create_file(dev,
3253                                 &dev_attr_suspend_mem_microvolts);
3254                 if (status < 0)
3255                         return status;
3256                 status = device_create_file(dev,
3257                                 &dev_attr_suspend_disk_microvolts);
3258                 if (status < 0)
3259                         return status;
3260         }
3261
3262         if (ops->set_suspend_mode) {
3263                 status = device_create_file(dev,
3264                                 &dev_attr_suspend_standby_mode);
3265                 if (status < 0)
3266                         return status;
3267                 status = device_create_file(dev,
3268                                 &dev_attr_suspend_mem_mode);
3269                 if (status < 0)
3270                         return status;
3271                 status = device_create_file(dev,
3272                                 &dev_attr_suspend_disk_mode);
3273                 if (status < 0)
3274                         return status;
3275         }
3276
3277         return status;
3278 }
3279
3280 static void rdev_init_debugfs(struct regulator_dev *rdev)
3281 {
3282         rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3283         if (!rdev->debugfs) {
3284                 rdev_warn(rdev, "Failed to create debugfs directory\n");
3285                 return;
3286         }
3287
3288         debugfs_create_u32("use_count", 0444, rdev->debugfs,
3289                            &rdev->use_count);
3290         debugfs_create_u32("open_count", 0444, rdev->debugfs,
3291                            &rdev->open_count);
3292         debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3293                            &rdev->bypass_count);
3294 }
3295
3296 /**
3297  * regulator_register - register regulator
3298  * @regulator_desc: regulator to register
3299  * @config: runtime configuration for regulator
3300  *
3301  * Called by regulator drivers to register a regulator.
3302  * Returns 0 on success.
3303  */
3304 struct regulator_dev *
3305 regulator_register(const struct regulator_desc *regulator_desc,
3306                    const struct regulator_config *config)
3307 {
3308         const struct regulation_constraints *constraints = NULL;
3309         const struct regulator_init_data *init_data;
3310         static atomic_t regulator_no = ATOMIC_INIT(0);
3311         struct regulator_dev *rdev;
3312         struct device *dev;
3313         int ret, i;
3314         const char *supply = NULL;
3315
3316         if (regulator_desc == NULL || config == NULL)
3317                 return ERR_PTR(-EINVAL);
3318
3319         dev = config->dev;
3320         WARN_ON(!dev);
3321
3322         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3323                 return ERR_PTR(-EINVAL);
3324
3325         if (regulator_desc->type != REGULATOR_VOLTAGE &&
3326             regulator_desc->type != REGULATOR_CURRENT)
3327                 return ERR_PTR(-EINVAL);
3328
3329         /* Only one of each should be implemented */
3330         WARN_ON(regulator_desc->ops->get_voltage &&
3331                 regulator_desc->ops->get_voltage_sel);
3332         WARN_ON(regulator_desc->ops->set_voltage &&
3333                 regulator_desc->ops->set_voltage_sel);
3334
3335         /* If we're using selectors we must implement list_voltage. */
3336         if (regulator_desc->ops->get_voltage_sel &&
3337             !regulator_desc->ops->list_voltage) {
3338                 return ERR_PTR(-EINVAL);
3339         }
3340         if (regulator_desc->ops->set_voltage_sel &&
3341             !regulator_desc->ops->list_voltage) {
3342                 return ERR_PTR(-EINVAL);
3343         }
3344
3345         init_data = config->init_data;
3346
3347         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3348         if (rdev == NULL)
3349                 return ERR_PTR(-ENOMEM);
3350
3351         mutex_lock(&regulator_list_mutex);
3352
3353         mutex_init(&rdev->mutex);
3354         rdev->reg_data = config->driver_data;
3355         rdev->owner = regulator_desc->owner;
3356         rdev->desc = regulator_desc;
3357         if (config->regmap)
3358                 rdev->regmap = config->regmap;
3359         else if (dev_get_regmap(dev, NULL))
3360                 rdev->regmap = dev_get_regmap(dev, NULL);
3361         else if (dev->parent)
3362                 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3363         INIT_LIST_HEAD(&rdev->consumer_list);
3364         INIT_LIST_HEAD(&rdev->list);
3365         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3366         INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3367
3368         /* preform any regulator specific init */
3369         if (init_data && init_data->regulator_init) {
3370                 ret = init_data->regulator_init(rdev->reg_data);
3371                 if (ret < 0)
3372                         goto clean;
3373         }
3374
3375         /* register with sysfs */
3376         rdev->dev.class = &regulator_class;
3377         rdev->dev.of_node = config->of_node;
3378         rdev->dev.parent = dev;
3379         dev_set_name(&rdev->dev, "regulator.%d",
3380                      atomic_inc_return(&regulator_no) - 1);
3381         ret = device_register(&rdev->dev);
3382         if (ret != 0) {
3383                 put_device(&rdev->dev);
3384                 goto clean;
3385         }
3386
3387         dev_set_drvdata(&rdev->dev, rdev);
3388
3389         if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3390                 ret = gpio_request_one(config->ena_gpio,
3391                                        GPIOF_DIR_OUT | config->ena_gpio_flags,
3392                                        rdev_get_name(rdev));
3393                 if (ret != 0) {
3394                         rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3395                                  config->ena_gpio, ret);
3396                         goto wash;
3397                 }
3398
3399                 rdev->ena_gpio = config->ena_gpio;
3400                 rdev->ena_gpio_invert = config->ena_gpio_invert;
3401
3402                 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3403                         rdev->ena_gpio_state = 1;
3404
3405                 if (rdev->ena_gpio_invert)
3406                         rdev->ena_gpio_state = !rdev->ena_gpio_state;
3407         }
3408
3409         /* set regulator constraints */
3410         if (init_data)
3411                 constraints = &init_data->constraints;
3412
3413         ret = set_machine_constraints(rdev, constraints);
3414         if (ret < 0)
3415                 goto scrub;
3416
3417         /* add attributes supported by this regulator */
3418         ret = add_regulator_attributes(rdev);
3419         if (ret < 0)
3420                 goto scrub;
3421
3422         if (init_data && init_data->supply_regulator)
3423                 supply = init_data->supply_regulator;
3424         else if (regulator_desc->supply_name)
3425                 supply = regulator_desc->supply_name;
3426
3427         if (supply) {
3428                 struct regulator_dev *r;
3429
3430                 r = regulator_dev_lookup(dev, supply, &ret);
3431
3432                 if (!r) {
3433                         dev_err(dev, "Failed to find supply %s\n", supply);
3434                         ret = -EPROBE_DEFER;
3435                         goto scrub;
3436                 }
3437
3438                 ret = set_supply(rdev, r);
3439                 if (ret < 0)
3440                         goto scrub;
3441
3442                 /* Enable supply if rail is enabled */
3443                 if (_regulator_is_enabled(rdev)) {
3444                         ret = regulator_enable(rdev->supply);
3445                         if (ret < 0)
3446                                 goto scrub;
3447                 }
3448         }
3449
3450         /* add consumers devices */
3451         if (init_data) {
3452                 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3453                         ret = set_consumer_device_supply(rdev,
3454                                 init_data->consumer_supplies[i].dev_name,
3455                                 init_data->consumer_supplies[i].supply);
3456                         if (ret < 0) {
3457                                 dev_err(dev, "Failed to set supply %s\n",
3458                                         init_data->consumer_supplies[i].supply);
3459                                 goto unset_supplies;
3460                         }
3461                 }
3462         }
3463
3464         list_add(&rdev->list, &regulator_list);
3465
3466         rdev_init_debugfs(rdev);
3467 out:
3468         mutex_unlock(&regulator_list_mutex);
3469         return rdev;
3470
3471 unset_supplies:
3472         unset_regulator_supplies(rdev);
3473
3474 scrub:
3475         if (rdev->supply)
3476                 _regulator_put(rdev->supply);
3477         if (rdev->ena_gpio)
3478                 gpio_free(rdev->ena_gpio);
3479         kfree(rdev->constraints);
3480 wash:
3481         device_unregister(&rdev->dev);
3482         /* device core frees rdev */
3483         rdev = ERR_PTR(ret);
3484         goto out;
3485
3486 clean:
3487         kfree(rdev);
3488         rdev = ERR_PTR(ret);
3489         goto out;
3490 }
3491 EXPORT_SYMBOL_GPL(regulator_register);
3492
3493 /**
3494  * regulator_unregister - unregister regulator
3495  * @rdev: regulator to unregister
3496  *
3497  * Called by regulator drivers to unregister a regulator.
3498  */
3499 void regulator_unregister(struct regulator_dev *rdev)
3500 {
3501         if (rdev == NULL)
3502                 return;
3503
3504         if (rdev->supply)
3505                 regulator_put(rdev->supply);
3506         mutex_lock(&regulator_list_mutex);
3507         debugfs_remove_recursive(rdev->debugfs);
3508         flush_work(&rdev->disable_work.work);
3509         WARN_ON(rdev->open_count);
3510         unset_regulator_supplies(rdev);
3511         list_del(&rdev->list);
3512         kfree(rdev->constraints);
3513         if (rdev->ena_gpio)
3514                 gpio_free(rdev->ena_gpio);
3515         device_unregister(&rdev->dev);
3516         mutex_unlock(&regulator_list_mutex);
3517 }
3518 EXPORT_SYMBOL_GPL(regulator_unregister);
3519
3520 /**
3521  * regulator_suspend_prepare - prepare regulators for system wide suspend
3522  * @state: system suspend state
3523  *
3524  * Configure each regulator with it's suspend operating parameters for state.
3525  * This will usually be called by machine suspend code prior to supending.
3526  */
3527 int regulator_suspend_prepare(suspend_state_t state)
3528 {
3529         struct regulator_dev *rdev;
3530         int ret = 0;
3531
3532         /* ON is handled by regulator active state */
3533         if (state == PM_SUSPEND_ON)
3534                 return -EINVAL;
3535
3536         mutex_lock(&regulator_list_mutex);
3537         list_for_each_entry(rdev, &regulator_list, list) {
3538
3539                 mutex_lock(&rdev->mutex);
3540                 ret = suspend_prepare(rdev, state);
3541                 mutex_unlock(&rdev->mutex);
3542
3543                 if (ret < 0) {
3544                         rdev_err(rdev, "failed to prepare\n");
3545                         goto out;
3546                 }
3547         }
3548 out:
3549         mutex_unlock(&regulator_list_mutex);
3550         return ret;
3551 }
3552 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3553
3554 /**
3555  * regulator_suspend_finish - resume regulators from system wide suspend
3556  *
3557  * Turn on regulators that might be turned off by regulator_suspend_prepare
3558  * and that should be turned on according to the regulators properties.
3559  */
3560 int regulator_suspend_finish(void)
3561 {
3562         struct regulator_dev *rdev;
3563         int ret = 0, error;
3564
3565         mutex_lock(&regulator_list_mutex);
3566         list_for_each_entry(rdev, &regulator_list, list) {
3567                 struct regulator_ops *ops = rdev->desc->ops;
3568
3569                 mutex_lock(&rdev->mutex);
3570                 if ((rdev->use_count > 0  || rdev->constraints->always_on) &&
3571                                 ops->enable) {
3572                         error = ops->enable(rdev);
3573                         if (error)
3574                                 ret = error;
3575                 } else {
3576                         if (!has_full_constraints)
3577                                 goto unlock;
3578                         if (!ops->disable)
3579                                 goto unlock;
3580                         if (!_regulator_is_enabled(rdev))
3581                                 goto unlock;
3582
3583                         error = ops->disable(rdev);
3584                         if (error)
3585                                 ret = error;
3586                 }
3587 unlock:
3588                 mutex_unlock(&rdev->mutex);
3589         }
3590         mutex_unlock(&regulator_list_mutex);
3591         return ret;
3592 }
3593 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3594
3595 /**
3596  * regulator_has_full_constraints - the system has fully specified constraints
3597  *
3598  * Calling this function will cause the regulator API to disable all
3599  * regulators which have a zero use count and don't have an always_on
3600  * constraint in a late_initcall.
3601  *
3602  * The intention is that this will become the default behaviour in a
3603  * future kernel release so users are encouraged to use this facility
3604  * now.
3605  */
3606 void regulator_has_full_constraints(void)
3607 {
3608         has_full_constraints = 1;
3609 }
3610 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3611
3612 /**
3613  * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3614  *
3615  * Calling this function will cause the regulator API to provide a
3616  * dummy regulator to consumers if no physical regulator is found,
3617  * allowing most consumers to proceed as though a regulator were
3618  * configured.  This allows systems such as those with software
3619  * controllable regulators for the CPU core only to be brought up more
3620  * readily.
3621  */
3622 void regulator_use_dummy_regulator(void)
3623 {
3624         board_wants_dummy_regulator = true;
3625 }
3626 EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3627
3628 /**
3629  * rdev_get_drvdata - get rdev regulator driver data
3630  * @rdev: regulator
3631  *
3632  * Get rdev regulator driver private data. This call can be used in the
3633  * regulator driver context.
3634  */
3635 void *rdev_get_drvdata(struct regulator_dev *rdev)
3636 {
3637         return rdev->reg_data;
3638 }
3639 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3640
3641 /**
3642  * regulator_get_drvdata - get regulator driver data
3643  * @regulator: regulator
3644  *
3645  * Get regulator driver private data. This call can be used in the consumer
3646  * driver context when non API regulator specific functions need to be called.
3647  */
3648 void *regulator_get_drvdata(struct regulator *regulator)
3649 {
3650         return regulator->rdev->reg_data;
3651 }
3652 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3653
3654 /**
3655  * regulator_set_drvdata - set regulator driver data
3656  * @regulator: regulator
3657  * @data: data
3658  */
3659 void regulator_set_drvdata(struct regulator *regulator, void *data)
3660 {
3661         regulator->rdev->reg_data = data;
3662 }
3663 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3664
3665 /**
3666  * regulator_get_id - get regulator ID
3667  * @rdev: regulator
3668  */
3669 int rdev_get_id(struct regulator_dev *rdev)
3670 {
3671         return rdev->desc->id;
3672 }
3673 EXPORT_SYMBOL_GPL(rdev_get_id);
3674
3675 struct device *rdev_get_dev(struct regulator_dev *rdev)
3676 {
3677         return &rdev->dev;
3678 }
3679 EXPORT_SYMBOL_GPL(rdev_get_dev);
3680
3681 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3682 {
3683         return reg_init_data->driver_data;
3684 }
3685 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3686
3687 #ifdef CONFIG_DEBUG_FS
3688 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3689                                     size_t count, loff_t *ppos)
3690 {
3691         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3692         ssize_t len, ret = 0;
3693         struct regulator_map *map;
3694
3695         if (!buf)
3696                 return -ENOMEM;
3697
3698         list_for_each_entry(map, &regulator_map_list, list) {
3699                 len = snprintf(buf + ret, PAGE_SIZE - ret,
3700                                "%s -> %s.%s\n",
3701                                rdev_get_name(map->regulator), map->dev_name,
3702                                map->supply);
3703                 if (len >= 0)
3704                         ret += len;
3705                 if (ret > PAGE_SIZE) {
3706                         ret = PAGE_SIZE;
3707                         break;
3708                 }
3709         }
3710
3711         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3712
3713         kfree(buf);
3714
3715         return ret;
3716 }
3717 #endif
3718
3719 static const struct file_operations supply_map_fops = {
3720 #ifdef CONFIG_DEBUG_FS
3721         .read = supply_map_read_file,
3722         .llseek = default_llseek,
3723 #endif
3724 };
3725
3726 static int __init regulator_init(void)
3727 {
3728         int ret;
3729
3730         ret = class_register(&regulator_class);
3731
3732         debugfs_root = debugfs_create_dir("regulator", NULL);
3733         if (!debugfs_root)
3734                 pr_warn("regulator: Failed to create debugfs directory\n");
3735
3736         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3737                             &supply_map_fops);
3738
3739         regulator_dummy_init();
3740
3741         return ret;
3742 }
3743
3744 /* init early to allow our consumers to complete system booting */
3745 core_initcall(regulator_init);
3746
3747 static int __init regulator_init_complete(void)
3748 {
3749         struct regulator_dev *rdev;
3750         struct regulator_ops *ops;
3751         struct regulation_constraints *c;
3752         int enabled, ret;
3753
3754         /*
3755          * Since DT doesn't provide an idiomatic mechanism for
3756          * enabling full constraints and since it's much more natural
3757          * with DT to provide them just assume that a DT enabled
3758          * system has full constraints.
3759          */
3760         if (of_have_populated_dt())
3761                 has_full_constraints = true;
3762
3763         mutex_lock(&regulator_list_mutex);
3764
3765         /* If we have a full configuration then disable any regulators
3766          * which are not in use or always_on.  This will become the
3767          * default behaviour in the future.
3768          */
3769         list_for_each_entry(rdev, &regulator_list, list) {
3770                 ops = rdev->desc->ops;
3771                 c = rdev->constraints;
3772
3773                 if (!ops->disable || (c && c->always_on))
3774                         continue;
3775
3776                 mutex_lock(&rdev->mutex);
3777
3778                 if (rdev->use_count)
3779                         goto unlock;
3780
3781                 /* If we can't read the status assume it's on. */
3782                 if (ops->is_enabled)
3783                         enabled = ops->is_enabled(rdev);
3784                 else
3785                         enabled = 1;
3786
3787                 if (!enabled)
3788                         goto unlock;
3789
3790                 if (has_full_constraints) {
3791                         /* We log since this may kill the system if it
3792                          * goes wrong. */
3793                         rdev_info(rdev, "disabling\n");
3794                         ret = ops->disable(rdev);
3795                         if (ret != 0) {
3796                                 rdev_err(rdev, "couldn't disable: %d\n", ret);
3797                         }
3798                 } else {
3799                         /* The intention is that in future we will
3800                          * assume that full constraints are provided
3801                          * so warn even if we aren't going to do
3802                          * anything here.
3803                          */
3804                         rdev_warn(rdev, "incomplete constraints, leaving on\n");
3805                 }
3806
3807 unlock:
3808                 mutex_unlock(&rdev->mutex);
3809         }
3810
3811         mutex_unlock(&regulator_list_mutex);
3812
3813         return 0;
3814 }
3815 late_initcall(regulator_init_complete);