Pileus Git - ~andy/linux/blob - drivers/regulator/core.c

   1 /*
   2  * core.c  --  Voltage/Current Regulator framework.
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  * Copyright 2008 SlimLogic Ltd.
   6  *
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/device.h>
  20 #include <linux/slab.h>
  21 #include <linux/async.h>
  22 #include <linux/err.h>
  23 #include <linux/mutex.h>
  24 #include <linux/suspend.h>
  25 #include <linux/delay.h>
  26 #include <linux/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 #include "internal.h"
  40
  41 #define rdev_crit(rdev, fmt, ...)                                       \
  42         pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  43 #define rdev_err(rdev, fmt, ...)                                        \
  44         pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  45 #define rdev_warn(rdev, fmt, ...)                                       \
  46         pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  47 #define rdev_info(rdev, fmt, ...)                                       \
  48         pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  49 #define rdev_dbg(rdev, fmt, ...)                                        \
  50         pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  51
  52 static DEFINE_MUTEX(regulator_list_mutex);
  53 static LIST_HEAD(regulator_list);
  54 static LIST_HEAD(regulator_map_list);
  55 static LIST_HEAD(regulator_ena_gpio_list);
  56 static LIST_HEAD(regulator_supply_alias_list);
  57 static bool has_full_constraints;
  58
  59 static struct dentry *debugfs_root;
  60
  61 /*
  62  * struct regulator_map
  63  *
  64  * Used to provide symbolic supply names to devices.
  65  */
  66 struct regulator_map {
  67         struct list_head list;
  68         const char *dev_name;   /* The dev_name() for the consumer */
  69         const char *supply;
  70         struct regulator_dev *regulator;
  71 };
  72
  73 /*
  74  * struct regulator_enable_gpio
  75  *
  76  * Management for shared enable GPIO pin
  77  */
  78 struct regulator_enable_gpio {
  79         struct list_head list;
  80         int gpio;
  81         u32 enable_count;       /* a number of enabled shared GPIO */
  82         u32 request_count;      /* a number of requested shared GPIO */
  83         unsigned int ena_gpio_invert:1;
  84 };
  85
  86 /*
  87  * struct regulator_supply_alias
  88  *
  89  * Used to map lookups for a supply onto an alternative device.
  90  */
  91 struct regulator_supply_alias {
  92         struct list_head list;
  93         struct device *src_dev;
  94         const char *src_supply;
  95         struct device *alias_dev;
  96         const char *alias_supply;
  97 };
  98
  99 static int _regulator_is_enabled(struct regulator_dev *rdev);
 100 static int _regulator_disable(struct regulator_dev *rdev);
 101 static int _regulator_get_voltage(struct regulator_dev *rdev);
 102 static int _regulator_get_current_limit(struct regulator_dev *rdev);
 103 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
 104 static void _notifier_call_chain(struct regulator_dev *rdev,
 105                                   unsigned long event, void *data);
 106 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 107                                      int min_uV, int max_uV);
 108 static struct regulator *create_regulator(struct regulator_dev *rdev,
 109                                           struct device *dev,
 110                                           const char *supply_name);
 111
 112 static const char *rdev_get_name(struct regulator_dev *rdev)
 113 {
 114         if (rdev->constraints && rdev->constraints->name)
 115                 return rdev->constraints->name;
 116         else if (rdev->desc->name)
 117                 return rdev->desc->name;
 118         else
 119                 return "";
 120 }
 121
 122 static bool have_full_constraints(void)
 123 {
 124         return has_full_constraints || of_have_populated_dt();
 125 }
 126
 127 /**
 128  * of_get_regulator - get a regulator device node based on supply name
 129  * @dev: Device pointer for the consumer (of regulator) device
 130  * @supply: regulator supply name
 131  *
 132  * Extract the regulator device node corresponding to the supply name.
 133  * returns the device node corresponding to the regulator if found, else
 134  * returns NULL.
 135  */
 136 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 137 {
 138         struct device_node *regnode = NULL;
 139         char prop_name[32]; /* 32 is max size of property name */
 140
 141         dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
 142
 143         snprintf(prop_name, 32, "%s-supply", supply);
 144         regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 145
 146         if (!regnode) {
 147                 dev_dbg(dev, "Looking up %s property in node %s failed",
 148                                 prop_name, dev->of_node->full_name);
 149                 return NULL;
 150         }
 151         return regnode;
 152 }
 153
 154 static int _regulator_can_change_status(struct regulator_dev *rdev)
 155 {
 156         if (!rdev->constraints)
 157                 return 0;
 158
 159         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
 160                 return 1;
 161         else
 162                 return 0;
 163 }
 164
 165 /* Platform voltage constraint check */
 166 static int regulator_check_voltage(struct regulator_dev *rdev,
 167                                    int *min_uV, int *max_uV)
 168 {
 169         BUG_ON(*min_uV > *max_uV);
 170
 171         if (!rdev->constraints) {
 172                 rdev_err(rdev, "no constraints\n");
 173                 return -ENODEV;
 174         }
 175         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 176                 rdev_err(rdev, "operation not allowed\n");
 177                 return -EPERM;
 178         }
 179
 180         if (*max_uV > rdev->constraints->max_uV)
 181                 *max_uV = rdev->constraints->max_uV;
 182         if (*min_uV < rdev->constraints->min_uV)
 183                 *min_uV = rdev->constraints->min_uV;
 184
 185         if (*min_uV > *max_uV) {
 186                 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
 187                          *min_uV, *max_uV);
 188                 return -EINVAL;
 189         }
 190
 191         return 0;
 192 }
 193
 194 /* Make sure we select a voltage that suits the needs of all
 195  * regulator consumers
 196  */
 197 static int regulator_check_consumers(struct regulator_dev *rdev,
 198                                      int *min_uV, int *max_uV)
 199 {
 200         struct regulator *regulator;
 201
 202         list_for_each_entry(regulator, &rdev->consumer_list, list) {
 203                 /*
 204                  * Assume consumers that didn't say anything are OK
 205                  * with anything in the constraint range.
 206                  */
 207                 if (!regulator->min_uV && !regulator->max_uV)
 208                         continue;
 209
 210                 if (*max_uV > regulator->max_uV)
 211                         *max_uV = regulator->max_uV;
 212                 if (*min_uV < regulator->min_uV)
 213                         *min_uV = regulator->min_uV;
 214         }
 215
 216         if (*min_uV > *max_uV) {
 217                 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
 218                         *min_uV, *max_uV);
 219                 return -EINVAL;
 220         }
 221
 222         return 0;
 223 }
 224
 225 /* current constraint check */
 226 static int regulator_check_current_limit(struct regulator_dev *rdev,
 227                                         int *min_uA, int *max_uA)
 228 {
 229         BUG_ON(*min_uA > *max_uA);
 230
 231         if (!rdev->constraints) {
 232                 rdev_err(rdev, "no constraints\n");
 233                 return -ENODEV;
 234         }
 235         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 236                 rdev_err(rdev, "operation not allowed\n");
 237                 return -EPERM;
 238         }
 239
 240         if (*max_uA > rdev->constraints->max_uA)
 241                 *max_uA = rdev->constraints->max_uA;
 242         if (*min_uA < rdev->constraints->min_uA)
 243                 *min_uA = rdev->constraints->min_uA;
 244
 245         if (*min_uA > *max_uA) {
 246                 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
 247                          *min_uA, *max_uA);
 248                 return -EINVAL;
 249         }
 250
 251         return 0;
 252 }
 253
 254 /* operating mode constraint check */
 255 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
 256 {
 257         switch (*mode) {
 258         case REGULATOR_MODE_FAST:
 259         case REGULATOR_MODE_NORMAL:
 260         case REGULATOR_MODE_IDLE:
 261         case REGULATOR_MODE_STANDBY:
 262                 break;
 263         default:
 264                 rdev_err(rdev, "invalid mode %x specified\n", *mode);
 265                 return -EINVAL;
 266         }
 267
 268         if (!rdev->constraints) {
 269                 rdev_err(rdev, "no constraints\n");
 270                 return -ENODEV;
 271         }
 272         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 273                 rdev_err(rdev, "operation not allowed\n");
 274                 return -EPERM;
 275         }
 276
 277         /* The modes are bitmasks, the most power hungry modes having
 278          * the lowest values. If the requested mode isn't supported
 279          * try higher modes. */
 280         while (*mode) {
 281                 if (rdev->constraints->valid_modes_mask & *mode)
 282                         return 0;
 283                 *mode /= 2;
 284         }
 285
 286         return -EINVAL;
 287 }
 288
 289 /* dynamic regulator mode switching constraint check */
 290 static int regulator_check_drms(struct regulator_dev *rdev)
 291 {
 292         if (!rdev->constraints) {
 293                 rdev_err(rdev, "no constraints\n");
 294                 return -ENODEV;
 295         }
 296         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 297                 rdev_err(rdev, "operation not allowed\n");
 298                 return -EPERM;
 299         }
 300         return 0;
 301 }
 302
 303 static ssize_t regulator_uV_show(struct device *dev,
 304                                 struct device_attribute *attr, char *buf)
 305 {
 306         struct regulator_dev *rdev = dev_get_drvdata(dev);
 307         ssize_t ret;
 308
 309         mutex_lock(&rdev->mutex);
 310         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 311         mutex_unlock(&rdev->mutex);
 312
 313         return ret;
 314 }
 315 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 316
 317 static ssize_t regulator_uA_show(struct device *dev,
 318                                 struct device_attribute *attr, char *buf)
 319 {
 320         struct regulator_dev *rdev = dev_get_drvdata(dev);
 321
 322         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 323 }
 324 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 325
 326 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 327                          char *buf)
 328 {
 329         struct regulator_dev *rdev = dev_get_drvdata(dev);
 330
 331         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 332 }
 333 static DEVICE_ATTR_RO(name);
 334
 335 static ssize_t regulator_print_opmode(char *buf, int mode)
 336 {
 337         switch (mode) {
 338         case REGULATOR_MODE_FAST:
 339                 return sprintf(buf, "fast\n");
 340         case REGULATOR_MODE_NORMAL:
 341                 return sprintf(buf, "normal\n");
 342         case REGULATOR_MODE_IDLE:
 343                 return sprintf(buf, "idle\n");
 344         case REGULATOR_MODE_STANDBY:
 345                 return sprintf(buf, "standby\n");
 346         }
 347         return sprintf(buf, "unknown\n");
 348 }
 349
 350 static ssize_t regulator_opmode_show(struct device *dev,
 351                                     struct device_attribute *attr, char *buf)
 352 {
 353         struct regulator_dev *rdev = dev_get_drvdata(dev);
 354
 355         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 356 }
 357 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 358
 359 static ssize_t regulator_print_state(char *buf, int state)
 360 {
 361         if (state > 0)
 362                 return sprintf(buf, "enabled\n");
 363         else if (state == 0)
 364                 return sprintf(buf, "disabled\n");
 365         else
 366                 return sprintf(buf, "unknown\n");
 367 }
 368
 369 static ssize_t regulator_state_show(struct device *dev,
 370                                    struct device_attribute *attr, char *buf)
 371 {
 372         struct regulator_dev *rdev = dev_get_drvdata(dev);
 373         ssize_t ret;
 374
 375         mutex_lock(&rdev->mutex);
 376         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 377         mutex_unlock(&rdev->mutex);
 378
 379         return ret;
 380 }
 381 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 382
 383 static ssize_t regulator_status_show(struct device *dev,
 384                                    struct device_attribute *attr, char *buf)
 385 {
 386         struct regulator_dev *rdev = dev_get_drvdata(dev);
 387         int status;
 388         char *label;
 389
 390         status = rdev->desc->ops->get_status(rdev);
 391         if (status < 0)
 392                 return status;
 393
 394         switch (status) {
 395         case REGULATOR_STATUS_OFF:
 396                 label = "off";
 397                 break;
 398         case REGULATOR_STATUS_ON:
 399                 label = "on";
 400                 break;
 401         case REGULATOR_STATUS_ERROR:
 402                 label = "error";
 403                 break;
 404         case REGULATOR_STATUS_FAST:
 405                 label = "fast";
 406                 break;
 407         case REGULATOR_STATUS_NORMAL:
 408                 label = "normal";
 409                 break;
 410         case REGULATOR_STATUS_IDLE:
 411                 label = "idle";
 412                 break;
 413         case REGULATOR_STATUS_STANDBY:
 414                 label = "standby";
 415                 break;
 416         case REGULATOR_STATUS_BYPASS:
 417                 label = "bypass";
 418                 break;
 419         case REGULATOR_STATUS_UNDEFINED:
 420                 label = "undefined";
 421                 break;
 422         default:
 423                 return -ERANGE;
 424         }
 425
 426         return sprintf(buf, "%s\n", label);
 427 }
 428 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 429
 430 static ssize_t regulator_min_uA_show(struct device *dev,
 431                                     struct device_attribute *attr, char *buf)
 432 {
 433         struct regulator_dev *rdev = dev_get_drvdata(dev);
 434
 435         if (!rdev->constraints)
 436                 return sprintf(buf, "constraint not defined\n");
 437
 438         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 439 }
 440 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 441
 442 static ssize_t regulator_max_uA_show(struct device *dev,
 443                                     struct device_attribute *attr, char *buf)
 444 {
 445         struct regulator_dev *rdev = dev_get_drvdata(dev);
 446
 447         if (!rdev->constraints)
 448                 return sprintf(buf, "constraint not defined\n");
 449
 450         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 451 }
 452 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 453
 454 static ssize_t regulator_min_uV_show(struct device *dev,
 455                                     struct device_attribute *attr, char *buf)
 456 {
 457         struct regulator_dev *rdev = dev_get_drvdata(dev);
 458
 459         if (!rdev->constraints)
 460                 return sprintf(buf, "constraint not defined\n");
 461
 462         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 463 }
 464 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 465
 466 static ssize_t regulator_max_uV_show(struct device *dev,
 467                                     struct device_attribute *attr, char *buf)
 468 {
 469         struct regulator_dev *rdev = dev_get_drvdata(dev);
 470
 471         if (!rdev->constraints)
 472                 return sprintf(buf, "constraint not defined\n");
 473
 474         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 475 }
 476 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 477
 478 static ssize_t regulator_total_uA_show(struct device *dev,
 479                                       struct device_attribute *attr, char *buf)
 480 {
 481         struct regulator_dev *rdev = dev_get_drvdata(dev);
 482         struct regulator *regulator;
 483         int uA = 0;
 484
 485         mutex_lock(&rdev->mutex);
 486         list_for_each_entry(regulator, &rdev->consumer_list, list)
 487                 uA += regulator->uA_load;
 488         mutex_unlock(&rdev->mutex);
 489         return sprintf(buf, "%d\n", uA);
 490 }
 491 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 492
 493 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
 494                               char *buf)
 495 {
 496         struct regulator_dev *rdev = dev_get_drvdata(dev);
 497         return sprintf(buf, "%d\n", rdev->use_count);
 498 }
 499 static DEVICE_ATTR_RO(num_users);
 500
 501 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 502                          char *buf)
 503 {
 504         struct regulator_dev *rdev = dev_get_drvdata(dev);
 505
 506         switch (rdev->desc->type) {
 507         case REGULATOR_VOLTAGE:
 508                 return sprintf(buf, "voltage\n");
 509         case REGULATOR_CURRENT:
 510                 return sprintf(buf, "current\n");
 511         }
 512         return sprintf(buf, "unknown\n");
 513 }
 514 static DEVICE_ATTR_RO(type);
 515
 516 static ssize_t regulator_suspend_mem_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_mem.uV);
 522 }
 523 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 524                 regulator_suspend_mem_uV_show, NULL);
 525
 526 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 527                                 struct device_attribute *attr, char *buf)
 528 {
 529         struct regulator_dev *rdev = dev_get_drvdata(dev);
 530
 531         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 532 }
 533 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 534                 regulator_suspend_disk_uV_show, NULL);
 535
 536 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 537                                 struct device_attribute *attr, char *buf)
 538 {
 539         struct regulator_dev *rdev = dev_get_drvdata(dev);
 540
 541         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 542 }
 543 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 544                 regulator_suspend_standby_uV_show, NULL);
 545
 546 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 547                                 struct device_attribute *attr, char *buf)
 548 {
 549         struct regulator_dev *rdev = dev_get_drvdata(dev);
 550
 551         return regulator_print_opmode(buf,
 552                 rdev->constraints->state_mem.mode);
 553 }
 554 static DEVICE_ATTR(suspend_mem_mode, 0444,
 555                 regulator_suspend_mem_mode_show, NULL);
 556
 557 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 558                                 struct device_attribute *attr, char *buf)
 559 {
 560         struct regulator_dev *rdev = dev_get_drvdata(dev);
 561
 562         return regulator_print_opmode(buf,
 563                 rdev->constraints->state_disk.mode);
 564 }
 565 static DEVICE_ATTR(suspend_disk_mode, 0444,
 566                 regulator_suspend_disk_mode_show, NULL);
 567
 568 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 569                                 struct device_attribute *attr, char *buf)
 570 {
 571         struct regulator_dev *rdev = dev_get_drvdata(dev);
 572
 573         return regulator_print_opmode(buf,
 574                 rdev->constraints->state_standby.mode);
 575 }
 576 static DEVICE_ATTR(suspend_standby_mode, 0444,
 577                 regulator_suspend_standby_mode_show, NULL);
 578
 579 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 580                                    struct device_attribute *attr, char *buf)
 581 {
 582         struct regulator_dev *rdev = dev_get_drvdata(dev);
 583
 584         return regulator_print_state(buf,
 585                         rdev->constraints->state_mem.enabled);
 586 }
 587 static DEVICE_ATTR(suspend_mem_state, 0444,
 588                 regulator_suspend_mem_state_show, NULL);
 589
 590 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 591                                    struct device_attribute *attr, char *buf)
 592 {
 593         struct regulator_dev *rdev = dev_get_drvdata(dev);
 594
 595         return regulator_print_state(buf,
 596                         rdev->constraints->state_disk.enabled);
 597 }
 598 static DEVICE_ATTR(suspend_disk_state, 0444,
 599                 regulator_suspend_disk_state_show, NULL);
 600
 601 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 602                                    struct device_attribute *attr, char *buf)
 603 {
 604         struct regulator_dev *rdev = dev_get_drvdata(dev);
 605
 606         return regulator_print_state(buf,
 607                         rdev->constraints->state_standby.enabled);
 608 }
 609 static DEVICE_ATTR(suspend_standby_state, 0444,
 610                 regulator_suspend_standby_state_show, NULL);
 611
 612 static ssize_t regulator_bypass_show(struct device *dev,
 613                                      struct device_attribute *attr, char *buf)
 614 {
 615         struct regulator_dev *rdev = dev_get_drvdata(dev);
 616         const char *report;
 617         bool bypass;
 618         int ret;
 619
 620         ret = rdev->desc->ops->get_bypass(rdev, &bypass);
 621
 622         if (ret != 0)
 623                 report = "unknown";
 624         else if (bypass)
 625                 report = "enabled";
 626         else
 627                 report = "disabled";
 628
 629         return sprintf(buf, "%s\n", report);
 630 }
 631 static DEVICE_ATTR(bypass, 0444,
 632                    regulator_bypass_show, NULL);
 633
 634 /*
 635  * These are the only attributes are present for all regulators.
 636  * Other attributes are a function of regulator functionality.
 637  */
 638 static struct attribute *regulator_dev_attrs[] = {
 639         &dev_attr_name.attr,
 640         &dev_attr_num_users.attr,
 641         &dev_attr_type.attr,
 642         NULL,
 643 };
 644 ATTRIBUTE_GROUPS(regulator_dev);
 645
 646 static void regulator_dev_release(struct device *dev)
 647 {
 648         struct regulator_dev *rdev = dev_get_drvdata(dev);
 649         kfree(rdev);
 650 }
 651
 652 static struct class regulator_class = {
 653         .name = "regulator",
 654         .dev_release = regulator_dev_release,
 655         .dev_groups = regulator_dev_groups,
 656 };
 657
 658 /* Calculate the new optimum regulator operating mode based on the new total
 659  * consumer load. All locks held by caller */
 660 static void drms_uA_update(struct regulator_dev *rdev)
 661 {
 662         struct regulator *sibling;
 663         int current_uA = 0, output_uV, input_uV, err;
 664         unsigned int mode;
 665
 666         err = regulator_check_drms(rdev);
 667         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 668             (!rdev->desc->ops->get_voltage &&
 669              !rdev->desc->ops->get_voltage_sel) ||
 670             !rdev->desc->ops->set_mode)
 671                 return;
 672
 673         /* get output voltage */
 674         output_uV = _regulator_get_voltage(rdev);
 675         if (output_uV <= 0)
 676                 return;
 677
 678         /* get input voltage */
 679         input_uV = 0;
 680         if (rdev->supply)
 681                 input_uV = regulator_get_voltage(rdev->supply);
 682         if (input_uV <= 0)
 683                 input_uV = rdev->constraints->input_uV;
 684         if (input_uV <= 0)
 685                 return;
 686
 687         /* calc total requested load */
 688         list_for_each_entry(sibling, &rdev->consumer_list, list)
 689                 current_uA += sibling->uA_load;
 690
 691         /* now get the optimum mode for our new total regulator load */
 692         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 693                                                   output_uV, current_uA);
 694
 695         /* check the new mode is allowed */
 696         err = regulator_mode_constrain(rdev, &mode);
 697         if (err == 0)
 698                 rdev->desc->ops->set_mode(rdev, mode);
 699 }
 700
 701 static int suspend_set_state(struct regulator_dev *rdev,
 702         struct regulator_state *rstate)
 703 {
 704         int ret = 0;
 705
 706         /* If we have no suspend mode configration don't set anything;
 707          * only warn if the driver implements set_suspend_voltage or
 708          * set_suspend_mode callback.
 709          */
 710         if (!rstate->enabled && !rstate->disabled) {
 711                 if (rdev->desc->ops->set_suspend_voltage ||
 712                     rdev->desc->ops->set_suspend_mode)
 713                         rdev_warn(rdev, "No configuration\n");
 714                 return 0;
 715         }
 716
 717         if (rstate->enabled && rstate->disabled) {
 718                 rdev_err(rdev, "invalid configuration\n");
 719                 return -EINVAL;
 720         }
 721
 722         if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
 723                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 724         else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
 725                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 726         else /* OK if set_suspend_enable or set_suspend_disable is NULL */
 727                 ret = 0;
 728
 729         if (ret < 0) {
 730                 rdev_err(rdev, "failed to enabled/disable\n");
 731                 return ret;
 732         }
 733
 734         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 735                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 736                 if (ret < 0) {
 737                         rdev_err(rdev, "failed to set voltage\n");
 738                         return ret;
 739                 }
 740         }
 741
 742         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 743                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 744                 if (ret < 0) {
 745                         rdev_err(rdev, "failed to set mode\n");
 746                         return ret;
 747                 }
 748         }
 749         return ret;
 750 }
 751
 752 /* locks held by caller */
 753 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 754 {
 755         if (!rdev->constraints)
 756                 return -EINVAL;
 757
 758         switch (state) {
 759         case PM_SUSPEND_STANDBY:
 760                 return suspend_set_state(rdev,
 761                         &rdev->constraints->state_standby);
 762         case PM_SUSPEND_MEM:
 763                 return suspend_set_state(rdev,
 764                         &rdev->constraints->state_mem);
 765         case PM_SUSPEND_MAX:
 766                 return suspend_set_state(rdev,
 767                         &rdev->constraints->state_disk);
 768         default:
 769                 return -EINVAL;
 770         }
 771 }
 772
 773 static void print_constraints(struct regulator_dev *rdev)
 774 {
 775         struct regulation_constraints *constraints = rdev->constraints;
 776         char buf[80] = "";
 777         int count = 0;
 778         int ret;
 779
 780         if (constraints->min_uV && constraints->max_uV) {
 781                 if (constraints->min_uV == constraints->max_uV)
 782                         count += sprintf(buf + count, "%d mV ",
 783                                          constraints->min_uV / 1000);
 784                 else
 785                         count += sprintf(buf + count, "%d <--> %d mV ",
 786                                          constraints->min_uV / 1000,
 787                                          constraints->max_uV / 1000);
 788         }
 789
 790         if (!constraints->min_uV ||
 791             constraints->min_uV != constraints->max_uV) {
 792                 ret = _regulator_get_voltage(rdev);
 793                 if (ret > 0)
 794                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
 795         }
 796
 797         if (constraints->uV_offset)
 798                 count += sprintf(buf, "%dmV offset ",
 799                                  constraints->uV_offset / 1000);
 800
 801         if (constraints->min_uA && constraints->max_uA) {
 802                 if (constraints->min_uA == constraints->max_uA)
 803                         count += sprintf(buf + count, "%d mA ",
 804                                          constraints->min_uA / 1000);
 805                 else
 806                         count += sprintf(buf + count, "%d <--> %d mA ",
 807                                          constraints->min_uA / 1000,
 808                                          constraints->max_uA / 1000);
 809         }
 810
 811         if (!constraints->min_uA ||
 812             constraints->min_uA != constraints->max_uA) {
 813                 ret = _regulator_get_current_limit(rdev);
 814                 if (ret > 0)
 815                         count += sprintf(buf + count, "at %d mA ", ret / 1000);
 816         }
 817
 818         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 819                 count += sprintf(buf + count, "fast ");
 820         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 821                 count += sprintf(buf + count, "normal ");
 822         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 823                 count += sprintf(buf + count, "idle ");
 824         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 825                 count += sprintf(buf + count, "standby");
 826
 827         if (!count)
 828                 sprintf(buf, "no parameters");
 829
 830         rdev_info(rdev, "%s\n", buf);
 831
 832         if ((constraints->min_uV != constraints->max_uV) &&
 833             !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
 834                 rdev_warn(rdev,
 835                           "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
 836 }
 837
 838 static int machine_constraints_voltage(struct regulator_dev *rdev,
 839         struct regulation_constraints *constraints)
 840 {
 841         struct regulator_ops *ops = rdev->desc->ops;
 842         int ret;
 843
 844         /* do we need to apply the constraint voltage */
 845         if (rdev->constraints->apply_uV &&
 846             rdev->constraints->min_uV == rdev->constraints->max_uV) {
 847                 ret = _regulator_do_set_voltage(rdev,
 848                                                 rdev->constraints->min_uV,
 849                                                 rdev->constraints->max_uV);
 850                 if (ret < 0) {
 851                         rdev_err(rdev, "failed to apply %duV constraint\n",
 852                                  rdev->constraints->min_uV);
 853                         return ret;
 854                 }
 855         }
 856
 857         /* constrain machine-level voltage specs to fit
 858          * the actual range supported by this regulator.
 859          */
 860         if (ops->list_voltage && rdev->desc->n_voltages) {
 861                 int     count = rdev->desc->n_voltages;
 862                 int     i;
 863                 int     min_uV = INT_MAX;
 864                 int     max_uV = INT_MIN;
 865                 int     cmin = constraints->min_uV;
 866                 int     cmax = constraints->max_uV;
 867
 868                 /* it's safe to autoconfigure fixed-voltage supplies
 869                    and the constraints are used by list_voltage. */
 870                 if (count == 1 && !cmin) {
 871                         cmin = 1;
 872                         cmax = INT_MAX;
 873                         constraints->min_uV = cmin;
 874                         constraints->max_uV = cmax;
 875                 }
 876
 877                 /* voltage constraints are optional */
 878                 if ((cmin == 0) && (cmax == 0))
 879                         return 0;
 880
 881                 /* else require explicit machine-level constraints */
 882                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 883                         rdev_err(rdev, "invalid voltage constraints\n");
 884                         return -EINVAL;
 885                 }
 886
 887                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 888                 for (i = 0; i < count; i++) {
 889                         int     value;
 890
 891                         value = ops->list_voltage(rdev, i);
 892                         if (value <= 0)
 893                                 continue;
 894
 895                         /* maybe adjust [min_uV..max_uV] */
 896                         if (value >= cmin && value < min_uV)
 897                                 min_uV = value;
 898                         if (value <= cmax && value > max_uV)
 899                                 max_uV = value;
 900                 }
 901
 902                 /* final: [min_uV..max_uV] valid iff constraints valid */
 903                 if (max_uV < min_uV) {
 904                         rdev_err(rdev,
 905                                  "unsupportable voltage constraints %u-%uuV\n",
 906                                  min_uV, max_uV);
 907                         return -EINVAL;
 908                 }
 909
 910                 /* use regulator's subset of machine constraints */
 911                 if (constraints->min_uV < min_uV) {
 912                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
 913                                  constraints->min_uV, min_uV);
 914                         constraints->min_uV = min_uV;
 915                 }
 916                 if (constraints->max_uV > max_uV) {
 917                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
 918                                  constraints->max_uV, max_uV);
 919                         constraints->max_uV = max_uV;
 920                 }
 921         }
 922
 923         return 0;
 924 }
 925
 926 static int machine_constraints_current(struct regulator_dev *rdev,
 927         struct regulation_constraints *constraints)
 928 {
 929         struct regulator_ops *ops = rdev->desc->ops;
 930         int ret;
 931
 932         if (!constraints->min_uA && !constraints->max_uA)
 933                 return 0;
 934
 935         if (constraints->min_uA > constraints->max_uA) {
 936                 rdev_err(rdev, "Invalid current constraints\n");
 937                 return -EINVAL;
 938         }
 939
 940         if (!ops->set_current_limit || !ops->get_current_limit) {
 941                 rdev_warn(rdev, "Operation of current configuration missing\n");
 942                 return 0;
 943         }
 944
 945         /* Set regulator current in constraints range */
 946         ret = ops->set_current_limit(rdev, constraints->min_uA,
 947                         constraints->max_uA);
 948         if (ret < 0) {
 949                 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
 950                 return ret;
 951         }
 952
 953         return 0;
 954 }
 955
 956 static int _regulator_do_enable(struct regulator_dev *rdev);
 957
 958 /**
 959  * set_machine_constraints - sets regulator constraints
 960  * @rdev: regulator source
 961  * @constraints: constraints to apply
 962  *
 963  * Allows platform initialisation code to define and constrain
 964  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 965  * Constraints *must* be set by platform code in order for some
 966  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 967  * set_mode.
 968  */
 969 static int set_machine_constraints(struct regulator_dev *rdev,
 970         const struct regulation_constraints *constraints)
 971 {
 972         int ret = 0;
 973         struct regulator_ops *ops = rdev->desc->ops;
 974
 975         if (constraints)
 976                 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
 977                                             GFP_KERNEL);
 978         else
 979                 rdev->constraints = kzalloc(sizeof(*constraints),
 980                                             GFP_KERNEL);
 981         if (!rdev->constraints)
 982                 return -ENOMEM;
 983
 984         ret = machine_constraints_voltage(rdev, rdev->constraints);
 985         if (ret != 0)
 986                 goto out;
 987
 988         ret = machine_constraints_current(rdev, rdev->constraints);
 989         if (ret != 0)
 990                 goto out;
 991
 992         /* do we need to setup our suspend state */
 993         if (rdev->constraints->initial_state) {
 994                 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
 995                 if (ret < 0) {
 996                         rdev_err(rdev, "failed to set suspend state\n");
 997                         goto out;
 998                 }
 999         }
1000
1001         if (rdev->constraints->initial_mode) {
1002                 if (!ops->set_mode) {
1003                         rdev_err(rdev, "no set_mode operation\n");
1004                         ret = -EINVAL;
1005                         goto out;
1006                 }
1007
1008                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1009                 if (ret < 0) {
1010                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1011                         goto out;
1012                 }
1013         }
1014
1015         /* If the constraints say the regulator should be on at this point
1016          * and we have control then make sure it is enabled.
1017          */
1018         if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1019                 ret = _regulator_do_enable(rdev);
1020                 if (ret < 0 && ret != -EINVAL) {
1021                         rdev_err(rdev, "failed to enable\n");
1022                         goto out;
1023                 }
1024         }
1025
1026         if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1027                 && ops->set_ramp_delay) {
1028                 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1029                 if (ret < 0) {
1030                         rdev_err(rdev, "failed to set ramp_delay\n");
1031                         goto out;
1032                 }
1033         }
1034
1035         print_constraints(rdev);
1036         return 0;
1037 out:
1038         kfree(rdev->constraints);
1039         rdev->constraints = NULL;
1040         return ret;
1041 }
1042
1043 /**
1044  * set_supply - set regulator supply regulator
1045  * @rdev: regulator name
1046  * @supply_rdev: supply regulator name
1047  *
1048  * Called by platform initialisation code to set the supply regulator for this
1049  * regulator. This ensures that a regulators supply will also be enabled by the
1050  * core if it's child is enabled.
1051  */
1052 static int set_supply(struct regulator_dev *rdev,
1053                       struct regulator_dev *supply_rdev)
1054 {
1055         int err;
1056
1057         rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1058
1059         rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1060         if (rdev->supply == NULL) {
1061                 err = -ENOMEM;
1062                 return err;
1063         }
1064         supply_rdev->open_count++;
1065
1066         return 0;
1067 }
1068
1069 /**
1070  * set_consumer_device_supply - Bind a regulator to a symbolic supply
1071  * @rdev:         regulator source
1072  * @consumer_dev_name: dev_name() string for device supply applies to
1073  * @supply:       symbolic name for supply
1074  *
1075  * Allows platform initialisation code to map physical regulator
1076  * sources to symbolic names for supplies for use by devices.  Devices
1077  * should use these symbolic names to request regulators, avoiding the
1078  * need to provide board-specific regulator names as platform data.
1079  */
1080 static int set_consumer_device_supply(struct regulator_dev *rdev,
1081                                       const char *consumer_dev_name,
1082                                       const char *supply)
1083 {
1084         struct regulator_map *node;
1085         int has_dev;
1086
1087         if (supply == NULL)
1088                 return -EINVAL;
1089
1090         if (consumer_dev_name != NULL)
1091                 has_dev = 1;
1092         else
1093                 has_dev = 0;
1094
1095         list_for_each_entry(node, &regulator_map_list, list) {
1096                 if (node->dev_name && consumer_dev_name) {
1097                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
1098                                 continue;
1099                 } else if (node->dev_name || consumer_dev_name) {
1100                         continue;
1101                 }
1102
1103                 if (strcmp(node->supply, supply) != 0)
1104                         continue;
1105
1106                 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1107                          consumer_dev_name,
1108                          dev_name(&node->regulator->dev),
1109                          node->regulator->desc->name,
1110                          supply,
1111                          dev_name(&rdev->dev), rdev_get_name(rdev));
1112                 return -EBUSY;
1113         }
1114
1115         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1116         if (node == NULL)
1117                 return -ENOMEM;
1118
1119         node->regulator = rdev;
1120         node->supply = supply;
1121
1122         if (has_dev) {
1123                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1124                 if (node->dev_name == NULL) {
1125                         kfree(node);
1126                         return -ENOMEM;
1127                 }
1128         }
1129
1130         list_add(&node->list, &regulator_map_list);
1131         return 0;
1132 }
1133
1134 static void unset_regulator_supplies(struct regulator_dev *rdev)
1135 {
1136         struct regulator_map *node, *n;
1137
1138         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1139                 if (rdev == node->regulator) {
1140                         list_del(&node->list);
1141                         kfree(node->dev_name);
1142                         kfree(node);
1143                 }
1144         }
1145 }
1146
1147 #define REG_STR_SIZE    64
1148
1149 static struct regulator *create_regulator(struct regulator_dev *rdev,
1150                                           struct device *dev,
1151                                           const char *supply_name)
1152 {
1153         struct regulator *regulator;
1154         char buf[REG_STR_SIZE];
1155         int err, size;
1156
1157         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1158         if (regulator == NULL)
1159                 return NULL;
1160
1161         mutex_lock(&rdev->mutex);
1162         regulator->rdev = rdev;
1163         list_add(&regulator->list, &rdev->consumer_list);
1164
1165         if (dev) {
1166                 regulator->dev = dev;
1167
1168                 /* Add a link to the device sysfs entry */
1169                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1170                                  dev->kobj.name, supply_name);
1171                 if (size >= REG_STR_SIZE)
1172                         goto overflow_err;
1173
1174                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1175                 if (regulator->supply_name == NULL)
1176                         goto overflow_err;
1177
1178                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1179                                         buf);
1180                 if (err) {
1181                         rdev_warn(rdev, "could not add device link %s err %d\n",
1182                                   dev->kobj.name, err);
1183                         /* non-fatal */
1184                 }
1185         } else {
1186                 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1187                 if (regulator->supply_name == NULL)
1188                         goto overflow_err;
1189         }
1190
1191         regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1192                                                 rdev->debugfs);
1193         if (!regulator->debugfs) {
1194                 rdev_warn(rdev, "Failed to create debugfs directory\n");
1195         } else {
1196                 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1197                                    &regulator->uA_load);
1198                 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1199                                    &regulator->min_uV);
1200                 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1201                                    &regulator->max_uV);
1202         }
1203
1204         /*
1205          * Check now if the regulator is an always on regulator - if
1206          * it is then we don't need to do nearly so much work for
1207          * enable/disable calls.
1208          */
1209         if (!_regulator_can_change_status(rdev) &&
1210             _regulator_is_enabled(rdev))
1211                 regulator->always_on = true;
1212
1213         mutex_unlock(&rdev->mutex);
1214         return regulator;
1215 overflow_err:
1216         list_del(&regulator->list);
1217         kfree(regulator);
1218         mutex_unlock(&rdev->mutex);
1219         return NULL;
1220 }
1221
1222 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1223 {
1224         if (rdev->constraints && rdev->constraints->enable_time)
1225                 return rdev->constraints->enable_time;
1226         if (!rdev->desc->ops->enable_time)
1227                 return rdev->desc->enable_time;
1228         return rdev->desc->ops->enable_time(rdev);
1229 }
1230
1231 static struct regulator_supply_alias *regulator_find_supply_alias(
1232                 struct device *dev, const char *supply)
1233 {
1234         struct regulator_supply_alias *map;
1235
1236         list_for_each_entry(map, &regulator_supply_alias_list, list)
1237                 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1238                         return map;
1239
1240         return NULL;
1241 }
1242
1243 static void regulator_supply_alias(struct device **dev, const char **supply)
1244 {
1245         struct regulator_supply_alias *map;
1246
1247         map = regulator_find_supply_alias(*dev, *supply);
1248         if (map) {
1249                 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1250                                 *supply, map->alias_supply,
1251                                 dev_name(map->alias_dev));
1252                 *dev = map->alias_dev;
1253                 *supply = map->alias_supply;
1254         }
1255 }
1256
1257 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1258                                                   const char *supply,
1259                                                   int *ret)
1260 {
1261         struct regulator_dev *r;
1262         struct device_node *node;
1263         struct regulator_map *map;
1264         const char *devname = NULL;
1265
1266         regulator_supply_alias(&dev, &supply);
1267
1268         /* first do a dt based lookup */
1269         if (dev && dev->of_node) {
1270                 node = of_get_regulator(dev, supply);
1271                 if (node) {
1272                         list_for_each_entry(r, &regulator_list, list)
1273                                 if (r->dev.parent &&
1274                                         node == r->dev.of_node)
1275                                         return r;
1276                 } else {
1277                         /*
1278                          * If we couldn't even get the node then it's
1279                          * not just that the device didn't register
1280                          * yet, there's no node and we'll never
1281                          * succeed.
1282                          */
1283                         *ret = -ENODEV;
1284                 }
1285         }
1286
1287         /* if not found, try doing it non-dt way */
1288         if (dev)
1289                 devname = dev_name(dev);
1290
1291         list_for_each_entry(r, &regulator_list, list)
1292                 if (strcmp(rdev_get_name(r), supply) == 0)
1293                         return r;
1294
1295         list_for_each_entry(map, &regulator_map_list, list) {
1296                 /* If the mapping has a device set up it must match */
1297                 if (map->dev_name &&
1298                     (!devname || strcmp(map->dev_name, devname)))
1299                         continue;
1300
1301                 if (strcmp(map->supply, supply) == 0)
1302                         return map->regulator;
1303         }
1304
1305
1306         return NULL;
1307 }
1308
1309 /* Internal regulator request function */
1310 static struct regulator *_regulator_get(struct device *dev, const char *id,
1311                                         bool exclusive, bool allow_dummy)
1312 {
1313         struct regulator_dev *rdev;
1314         struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1315         const char *devname = NULL;
1316         int ret = -EPROBE_DEFER;
1317
1318         if (id == NULL) {
1319                 pr_err("get() with no identifier\n");
1320                 return ERR_PTR(-EINVAL);
1321         }
1322
1323         if (dev)
1324                 devname = dev_name(dev);
1325
1326         mutex_lock(&regulator_list_mutex);
1327
1328         rdev = regulator_dev_lookup(dev, id, &ret);
1329         if (rdev)
1330                 goto found;
1331
1332         regulator = ERR_PTR(ret);
1333
1334         /*
1335          * If we have return value from dev_lookup fail, we do not expect to
1336          * succeed, so, quit with appropriate error value
1337          */
1338         if (ret && ret != -ENODEV)
1339                 goto out;
1340
1341         if (!devname)
1342                 devname = "deviceless";
1343
1344         /*
1345          * Assume that a regulator is physically present and enabled
1346          * even if it isn't hooked up and just provide a dummy.
1347          */
1348         if (have_full_constraints() && allow_dummy) {
1349                 pr_warn("%s supply %s not found, using dummy regulator\n",
1350                         devname, id);
1351
1352                 rdev = dummy_regulator_rdev;
1353                 goto found;
1354         /* Don't log an error when called from regulator_get_optional() */
1355         } else if (!have_full_constraints() || exclusive) {
1356                 dev_warn(dev, "dummy supplies not allowed\n");
1357         }
1358
1359         mutex_unlock(&regulator_list_mutex);
1360         return regulator;
1361
1362 found:
1363         if (rdev->exclusive) {
1364                 regulator = ERR_PTR(-EPERM);
1365                 goto out;
1366         }
1367
1368         if (exclusive && rdev->open_count) {
1369                 regulator = ERR_PTR(-EBUSY);
1370                 goto out;
1371         }
1372
1373         if (!try_module_get(rdev->owner))
1374                 goto out;
1375
1376         regulator = create_regulator(rdev, dev, id);
1377         if (regulator == NULL) {
1378                 regulator = ERR_PTR(-ENOMEM);
1379                 module_put(rdev->owner);
1380                 goto out;
1381         }
1382
1383         rdev->open_count++;
1384         if (exclusive) {
1385                 rdev->exclusive = 1;
1386
1387                 ret = _regulator_is_enabled(rdev);
1388                 if (ret > 0)
1389                         rdev->use_count = 1;
1390                 else
1391                         rdev->use_count = 0;
1392         }
1393
1394 out:
1395         mutex_unlock(&regulator_list_mutex);
1396
1397         return regulator;
1398 }
1399
1400 /**
1401  * regulator_get - lookup and obtain a reference to a regulator.
1402  * @dev: device for regulator "consumer"
1403  * @id: Supply name or regulator ID.
1404  *
1405  * Returns a struct regulator corresponding to the regulator producer,
1406  * or IS_ERR() condition containing errno.
1407  *
1408  * Use of supply names configured via regulator_set_device_supply() is
1409  * strongly encouraged.  It is recommended that the supply name used
1410  * should match the name used for the supply and/or the relevant
1411  * device pins in the datasheet.
1412  */
1413 struct regulator *regulator_get(struct device *dev, const char *id)
1414 {
1415         return _regulator_get(dev, id, false, true);
1416 }
1417 EXPORT_SYMBOL_GPL(regulator_get);
1418
1419 /**
1420  * regulator_get_exclusive - obtain exclusive access to a regulator.
1421  * @dev: device for regulator "consumer"
1422  * @id: Supply name or regulator ID.
1423  *
1424  * Returns a struct regulator corresponding to the regulator producer,
1425  * or IS_ERR() condition containing errno.  Other consumers will be
1426  * unable to obtain this reference is held and the use count for the
1427  * regulator will be initialised to reflect the current state of the
1428  * regulator.
1429  *
1430  * This is intended for use by consumers which cannot tolerate shared
1431  * use of the regulator such as those which need to force the
1432  * regulator off for correct operation of the hardware they are
1433  * controlling.
1434  *
1435  * Use of supply names configured via regulator_set_device_supply() is
1436  * strongly encouraged.  It is recommended that the supply name used
1437  * should match the name used for the supply and/or the relevant
1438  * device pins in the datasheet.
1439  */
1440 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1441 {
1442         return _regulator_get(dev, id, true, false);
1443 }
1444 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1445
1446 /**
1447  * regulator_get_optional - obtain optional access to a regulator.
1448  * @dev: device for regulator "consumer"
1449  * @id: Supply name or regulator ID.
1450  *
1451  * Returns a struct regulator corresponding to the regulator producer,
1452  * or IS_ERR() condition containing errno.  Other consumers will be
1453  * unable to obtain this reference is held and the use count for the
1454  * regulator will be initialised to reflect the current state of the
1455  * regulator.
1456  *
1457  * This is intended for use by consumers for devices which can have
1458  * some supplies unconnected in normal use, such as some MMC devices.
1459  * It can allow the regulator core to provide stub supplies for other
1460  * supplies requested using normal regulator_get() calls without
1461  * disrupting the operation of drivers that can handle absent
1462  * supplies.
1463  *
1464  * Use of supply names configured via regulator_set_device_supply() is
1465  * strongly encouraged.  It is recommended that the supply name used
1466  * should match the name used for the supply and/or the relevant
1467  * device pins in the datasheet.
1468  */
1469 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1470 {
1471         return _regulator_get(dev, id, false, false);
1472 }
1473 EXPORT_SYMBOL_GPL(regulator_get_optional);
1474
1475 /* Locks held by regulator_put() */
1476 static void _regulator_put(struct regulator *regulator)
1477 {
1478         struct regulator_dev *rdev;
1479
1480         if (regulator == NULL || IS_ERR(regulator))
1481                 return;
1482
1483         rdev = regulator->rdev;
1484
1485         debugfs_remove_recursive(regulator->debugfs);
1486
1487         /* remove any sysfs entries */
1488         if (regulator->dev)
1489                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1490         kfree(regulator->supply_name);
1491         list_del(&regulator->list);
1492         kfree(regulator);
1493
1494         rdev->open_count--;
1495         rdev->exclusive = 0;
1496
1497         module_put(rdev->owner);
1498 }
1499
1500 /**
1501  * regulator_put - "free" the regulator source
1502  * @regulator: regulator source
1503  *
1504  * Note: drivers must ensure that all regulator_enable calls made on this
1505  * regulator source are balanced by regulator_disable calls prior to calling
1506  * this function.
1507  */
1508 void regulator_put(struct regulator *regulator)
1509 {
1510         mutex_lock(&regulator_list_mutex);
1511         _regulator_put(regulator);
1512         mutex_unlock(&regulator_list_mutex);
1513 }
1514 EXPORT_SYMBOL_GPL(regulator_put);
1515
1516 /**
1517  * regulator_register_supply_alias - Provide device alias for supply lookup
1518  *
1519  * @dev: device that will be given as the regulator "consumer"
1520  * @id: Supply name or regulator ID
1521  * @alias_dev: device that should be used to lookup the supply
1522  * @alias_id: Supply name or regulator ID that should be used to lookup the
1523  * supply
1524  *
1525  * All lookups for id on dev will instead be conducted for alias_id on
1526  * alias_dev.
1527  */
1528 int regulator_register_supply_alias(struct device *dev, const char *id,
1529                                     struct device *alias_dev,
1530                                     const char *alias_id)
1531 {
1532         struct regulator_supply_alias *map;
1533
1534         map = regulator_find_supply_alias(dev, id);
1535         if (map)
1536                 return -EEXIST;
1537
1538         map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1539         if (!map)
1540                 return -ENOMEM;
1541
1542         map->src_dev = dev;
1543         map->src_supply = id;
1544         map->alias_dev = alias_dev;
1545         map->alias_supply = alias_id;
1546
1547         list_add(&map->list, &regulator_supply_alias_list);
1548
1549         pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1550                 id, dev_name(dev), alias_id, dev_name(alias_dev));
1551
1552         return 0;
1553 }
1554 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1555
1556 /**
1557  * regulator_unregister_supply_alias - Remove device alias
1558  *
1559  * @dev: device that will be given as the regulator "consumer"
1560  * @id: Supply name or regulator ID
1561  *
1562  * Remove a lookup alias if one exists for id on dev.
1563  */
1564 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1565 {
1566         struct regulator_supply_alias *map;
1567
1568         map = regulator_find_supply_alias(dev, id);
1569         if (map) {
1570                 list_del(&map->list);
1571                 kfree(map);
1572         }
1573 }
1574 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1575
1576 /**
1577  * regulator_bulk_register_supply_alias - register multiple aliases
1578  *
1579  * @dev: device that will be given as the regulator "consumer"
1580  * @id: List of supply names or regulator IDs
1581  * @alias_dev: device that should be used to lookup the supply
1582  * @alias_id: List of supply names or regulator IDs that should be used to
1583  * lookup the supply
1584  * @num_id: Number of aliases to register
1585  *
1586  * @return 0 on success, an errno on failure.
1587  *
1588  * This helper function allows drivers to register several supply
1589  * aliases in one operation.  If any of the aliases cannot be
1590  * registered any aliases that were registered will be removed
1591  * before returning to the caller.
1592  */
1593 int regulator_bulk_register_supply_alias(struct device *dev, const char **id,
1594                                          struct device *alias_dev,
1595                                          const char **alias_id,
1596                                          int num_id)
1597 {
1598         int i;
1599         int ret;
1600
1601         for (i = 0; i < num_id; ++i) {
1602                 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1603                                                       alias_id[i]);
1604                 if (ret < 0)
1605                         goto err;
1606         }
1607
1608         return 0;
1609
1610 err:
1611         dev_err(dev,
1612                 "Failed to create supply alias %s,%s -> %s,%s\n",
1613                 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1614
1615         while (--i >= 0)
1616                 regulator_unregister_supply_alias(dev, id[i]);
1617
1618         return ret;
1619 }
1620 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1621
1622 /**
1623  * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1624  *
1625  * @dev: device that will be given as the regulator "consumer"
1626  * @id: List of supply names or regulator IDs
1627  * @num_id: Number of aliases to unregister
1628  *
1629  * This helper function allows drivers to unregister several supply
1630  * aliases in one operation.
1631  */
1632 void regulator_bulk_unregister_supply_alias(struct device *dev,
1633                                             const char **id,
1634                                             int num_id)
1635 {
1636         int i;
1637
1638         for (i = 0; i < num_id; ++i)
1639                 regulator_unregister_supply_alias(dev, id[i]);
1640 }
1641 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1642
1643
1644 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1645 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1646                                 const struct regulator_config *config)
1647 {
1648         struct regulator_enable_gpio *pin;
1649         int ret;
1650
1651         list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
1652                 if (pin->gpio == config->ena_gpio) {
1653                         rdev_dbg(rdev, "GPIO %d is already used\n",
1654                                 config->ena_gpio);
1655                         goto update_ena_gpio_to_rdev;
1656                 }
1657         }
1658
1659         ret = gpio_request_one(config->ena_gpio,
1660                                 GPIOF_DIR_OUT | config->ena_gpio_flags,
1661                                 rdev_get_name(rdev));
1662         if (ret)
1663                 return ret;
1664
1665         pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1666         if (pin == NULL) {
1667                 gpio_free(config->ena_gpio);
1668                 return -ENOMEM;
1669         }
1670
1671         pin->gpio = config->ena_gpio;
1672         pin->ena_gpio_invert = config->ena_gpio_invert;
1673         list_add(&pin->list, &regulator_ena_gpio_list);
1674
1675 update_ena_gpio_to_rdev:
1676         pin->request_count++;
1677         rdev->ena_pin = pin;
1678         return 0;
1679 }
1680
1681 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1682 {
1683         struct regulator_enable_gpio *pin, *n;
1684
1685         if (!rdev->ena_pin)
1686                 return;
1687
1688         /* Free the GPIO only in case of no use */
1689         list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
1690                 if (pin->gpio == rdev->ena_pin->gpio) {
1691                         if (pin->request_count <= 1) {
1692                                 pin->request_count = 0;
1693                                 gpio_free(pin->gpio);
1694                                 list_del(&pin->list);
1695                                 kfree(pin);
1696                         } else {
1697                                 pin->request_count--;
1698                         }
1699                 }
1700         }
1701 }
1702
1703 /**
1704  * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1705  * @rdev: regulator_dev structure
1706  * @enable: enable GPIO at initial use?
1707  *
1708  * GPIO is enabled in case of initial use. (enable_count is 0)
1709  * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1710  */
1711 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1712 {
1713         struct regulator_enable_gpio *pin = rdev->ena_pin;
1714
1715         if (!pin)
1716                 return -EINVAL;
1717
1718         if (enable) {
1719                 /* Enable GPIO at initial use */
1720                 if (pin->enable_count == 0)
1721                         gpio_set_value_cansleep(pin->gpio,
1722                                                 !pin->ena_gpio_invert);
1723
1724                 pin->enable_count++;
1725         } else {
1726                 if (pin->enable_count > 1) {
1727                         pin->enable_count--;
1728                         return 0;
1729                 }
1730
1731                 /* Disable GPIO if not used */
1732                 if (pin->enable_count <= 1) {
1733                         gpio_set_value_cansleep(pin->gpio,
1734                                                 pin->ena_gpio_invert);
1735                         pin->enable_count = 0;
1736                 }
1737         }
1738
1739         return 0;
1740 }
1741
1742 static int _regulator_do_enable(struct regulator_dev *rdev)
1743 {
1744         int ret, delay;
1745
1746         /* Query before enabling in case configuration dependent.  */
1747         ret = _regulator_get_enable_time(rdev);
1748         if (ret >= 0) {
1749                 delay = ret;
1750         } else {
1751                 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1752                 delay = 0;
1753         }
1754
1755         trace_regulator_enable(rdev_get_name(rdev));
1756
1757         if (rdev->ena_pin) {
1758                 ret = regulator_ena_gpio_ctrl(rdev, true);
1759                 if (ret < 0)
1760                         return ret;
1761                 rdev->ena_gpio_state = 1;
1762         } else if (rdev->desc->ops->enable) {
1763                 ret = rdev->desc->ops->enable(rdev);
1764                 if (ret < 0)
1765                         return ret;
1766         } else {
1767                 return -EINVAL;
1768         }
1769
1770         /* Allow the regulator to ramp; it would be useful to extend
1771          * this for bulk operations so that the regulators can ramp
1772          * together.  */
1773         trace_regulator_enable_delay(rdev_get_name(rdev));
1774
1775         /*
1776          * Delay for the requested amount of time as per the guidelines in:
1777          *
1778          *     Documentation/timers/timers-howto.txt
1779          *
1780          * The assumption here is that regulators will never be enabled in
1781          * atomic context and therefore sleeping functions can be used.
1782          */
1783         if (delay) {
1784                 unsigned int ms = delay / 1000;
1785                 unsigned int us = delay % 1000;
1786
1787                 if (ms > 0) {
1788                         /*
1789                          * For small enough values, handle super-millisecond
1790                          * delays in the usleep_range() call below.
1791                          */
1792                         if (ms < 20)
1793                                 us += ms * 1000;
1794                         else
1795                                 msleep(ms);
1796                 }
1797
1798                 /*
1799                  * Give the scheduler some room to coalesce with any other
1800                  * wakeup sources. For delays shorter than 10 us, don't even
1801                  * bother setting up high-resolution timers and just busy-
1802                  * loop.
1803                  */
1804                 if (us >= 10)
1805                         usleep_range(us, us + 100);
1806                 else
1807                         udelay(us);
1808         }
1809
1810         trace_regulator_enable_complete(rdev_get_name(rdev));
1811
1812         return 0;
1813 }
1814
1815 /* locks held by regulator_enable() */
1816 static int _regulator_enable(struct regulator_dev *rdev)
1817 {
1818         int ret;
1819
1820         /* check voltage and requested load before enabling */
1821         if (rdev->constraints &&
1822             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1823                 drms_uA_update(rdev);
1824
1825         if (rdev->use_count == 0) {
1826                 /* The regulator may on if it's not switchable or left on */
1827                 ret = _regulator_is_enabled(rdev);
1828                 if (ret == -EINVAL || ret == 0) {
1829                         if (!_regulator_can_change_status(rdev))
1830                                 return -EPERM;
1831
1832                         ret = _regulator_do_enable(rdev);
1833                         if (ret < 0)
1834                                 return ret;
1835
1836                 } else if (ret < 0) {
1837                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1838                         return ret;
1839                 }
1840                 /* Fallthrough on positive return values - already enabled */
1841         }
1842
1843         rdev->use_count++;
1844
1845         return 0;
1846 }
1847
1848 /**
1849  * regulator_enable - enable regulator output
1850  * @regulator: regulator source
1851  *
1852  * Request that the regulator be enabled with the regulator output at
1853  * the predefined voltage or current value.  Calls to regulator_enable()
1854  * must be balanced with calls to regulator_disable().
1855  *
1856  * NOTE: the output value can be set by other drivers, boot loader or may be
1857  * hardwired in the regulator.
1858  */
1859 int regulator_enable(struct regulator *regulator)
1860 {
1861         struct regulator_dev *rdev = regulator->rdev;
1862         int ret = 0;
1863
1864         if (regulator->always_on)
1865                 return 0;
1866
1867         if (rdev->supply) {
1868                 ret = regulator_enable(rdev->supply);
1869                 if (ret != 0)
1870                         return ret;
1871         }
1872
1873         mutex_lock(&rdev->mutex);
1874         ret = _regulator_enable(rdev);
1875         mutex_unlock(&rdev->mutex);
1876
1877         if (ret != 0 && rdev->supply)
1878                 regulator_disable(rdev->supply);
1879
1880         return ret;
1881 }
1882 EXPORT_SYMBOL_GPL(regulator_enable);
1883
1884 static int _regulator_do_disable(struct regulator_dev *rdev)
1885 {
1886         int ret;
1887
1888         trace_regulator_disable(rdev_get_name(rdev));
1889
1890         if (rdev->ena_pin) {
1891                 ret = regulator_ena_gpio_ctrl(rdev, false);
1892                 if (ret < 0)
1893                         return ret;
1894                 rdev->ena_gpio_state = 0;
1895
1896         } else if (rdev->desc->ops->disable) {
1897                 ret = rdev->desc->ops->disable(rdev);
1898                 if (ret != 0)
1899                         return ret;
1900         }
1901
1902         trace_regulator_disable_complete(rdev_get_name(rdev));
1903
1904         return 0;
1905 }
1906
1907 /* locks held by regulator_disable() */
1908 static int _regulator_disable(struct regulator_dev *rdev)
1909 {
1910         int ret = 0;
1911
1912         if (WARN(rdev->use_count <= 0,
1913                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
1914                 return -EIO;
1915
1916         /* are we the last user and permitted to disable ? */
1917         if (rdev->use_count == 1 &&
1918             (rdev->constraints && !rdev->constraints->always_on)) {
1919
1920                 /* we are last user */
1921                 if (_regulator_can_change_status(rdev)) {
1922                         ret = _regulator_do_disable(rdev);
1923                         if (ret < 0) {
1924                                 rdev_err(rdev, "failed to disable\n");
1925                                 return ret;
1926                         }
1927                         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1928                                         NULL);
1929                 }
1930
1931                 rdev->use_count = 0;
1932         } else if (rdev->use_count > 1) {
1933
1934                 if (rdev->constraints &&
1935                         (rdev->constraints->valid_ops_mask &
1936                         REGULATOR_CHANGE_DRMS))
1937                         drms_uA_update(rdev);
1938
1939                 rdev->use_count--;
1940         }
1941
1942         return ret;
1943 }
1944
1945 /**
1946  * regulator_disable - disable regulator output
1947  * @regulator: regulator source
1948  *
1949  * Disable the regulator output voltage or current.  Calls to
1950  * regulator_enable() must be balanced with calls to
1951  * regulator_disable().
1952  *
1953  * NOTE: this will only disable the regulator output if no other consumer
1954  * devices have it enabled, the regulator device supports disabling and
1955  * machine constraints permit this operation.
1956  */
1957 int regulator_disable(struct regulator *regulator)
1958 {
1959         struct regulator_dev *rdev = regulator->rdev;
1960         int ret = 0;
1961
1962         if (regulator->always_on)
1963                 return 0;
1964
1965         mutex_lock(&rdev->mutex);
1966         ret = _regulator_disable(rdev);
1967         mutex_unlock(&rdev->mutex);
1968
1969         if (ret == 0 && rdev->supply)
1970                 regulator_disable(rdev->supply);
1971
1972         return ret;
1973 }
1974 EXPORT_SYMBOL_GPL(regulator_disable);
1975
1976 /* locks held by regulator_force_disable() */
1977 static int _regulator_force_disable(struct regulator_dev *rdev)
1978 {
1979         int ret = 0;
1980
1981         ret = _regulator_do_disable(rdev);
1982         if (ret < 0) {
1983                 rdev_err(rdev, "failed to force disable\n");
1984                 return ret;
1985         }
1986
1987         _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1988                         REGULATOR_EVENT_DISABLE, NULL);
1989
1990         return 0;
1991 }
1992
1993 /**
1994  * regulator_force_disable - force disable regulator output
1995  * @regulator: regulator source
1996  *
1997  * Forcibly disable the regulator output voltage or current.
1998  * NOTE: this *will* disable the regulator output even if other consumer
1999  * devices have it enabled. This should be used for situations when device
2000  * damage will likely occur if the regulator is not disabled (e.g. over temp).
2001  */
2002 int regulator_force_disable(struct regulator *regulator)
2003 {
2004         struct regulator_dev *rdev = regulator->rdev;
2005         int ret;
2006
2007         mutex_lock(&rdev->mutex);
2008         regulator->uA_load = 0;
2009         ret = _regulator_force_disable(regulator->rdev);
2010         mutex_unlock(&rdev->mutex);
2011
2012         if (rdev->supply)
2013                 while (rdev->open_count--)
2014                         regulator_disable(rdev->supply);
2015
2016         return ret;
2017 }
2018 EXPORT_SYMBOL_GPL(regulator_force_disable);
2019
2020 static void regulator_disable_work(struct work_struct *work)
2021 {
2022         struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2023                                                   disable_work.work);
2024         int count, i, ret;
2025
2026         mutex_lock(&rdev->mutex);
2027
2028         BUG_ON(!rdev->deferred_disables);
2029
2030         count = rdev->deferred_disables;
2031         rdev->deferred_disables = 0;
2032
2033         for (i = 0; i < count; i++) {
2034                 ret = _regulator_disable(rdev);
2035                 if (ret != 0)
2036                         rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2037         }
2038
2039         mutex_unlock(&rdev->mutex);
2040
2041         if (rdev->supply) {
2042                 for (i = 0; i < count; i++) {
2043                         ret = regulator_disable(rdev->supply);
2044                         if (ret != 0) {
2045                                 rdev_err(rdev,
2046                                          "Supply disable failed: %d\n", ret);
2047                         }
2048                 }
2049         }
2050 }
2051
2052 /**
2053  * regulator_disable_deferred - disable regulator output with delay
2054  * @regulator: regulator source
2055  * @ms: miliseconds until the regulator is disabled
2056  *
2057  * Execute regulator_disable() on the regulator after a delay.  This
2058  * is intended for use with devices that require some time to quiesce.
2059  *
2060  * NOTE: this will only disable the regulator output if no other consumer
2061  * devices have it enabled, the regulator device supports disabling and
2062  * machine constraints permit this operation.
2063  */
2064 int regulator_disable_deferred(struct regulator *regulator, int ms)
2065 {
2066         struct regulator_dev *rdev = regulator->rdev;
2067         int ret;
2068
2069         if (regulator->always_on)
2070                 return 0;
2071
2072         if (!ms)
2073                 return regulator_disable(regulator);
2074
2075         mutex_lock(&rdev->mutex);
2076         rdev->deferred_disables++;
2077         mutex_unlock(&rdev->mutex);
2078
2079         ret = queue_delayed_work(system_power_efficient_wq,
2080                                  &rdev->disable_work,
2081                                  msecs_to_jiffies(ms));
2082         if (ret < 0)
2083                 return ret;
2084         else
2085                 return 0;
2086 }
2087 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2088
2089 static int _regulator_is_enabled(struct regulator_dev *rdev)
2090 {
2091         /* A GPIO control always takes precedence */
2092         if (rdev->ena_pin)
2093                 return rdev->ena_gpio_state;
2094
2095         /* If we don't know then assume that the regulator is always on */
2096         if (!rdev->desc->ops->is_enabled)
2097                 return 1;
2098
2099         return rdev->desc->ops->is_enabled(rdev);
2100 }
2101
2102 /**
2103  * regulator_is_enabled - is the regulator output enabled
2104  * @regulator: regulator source
2105  *
2106  * Returns positive if the regulator driver backing the source/client
2107  * has requested that the device be enabled, zero if it hasn't, else a
2108  * negative errno code.
2109  *
2110  * Note that the device backing this regulator handle can have multiple
2111  * users, so it might be enabled even if regulator_enable() was never
2112  * called for this particular source.
2113  */
2114 int regulator_is_enabled(struct regulator *regulator)
2115 {
2116         int ret;
2117
2118         if (regulator->always_on)
2119                 return 1;
2120
2121         mutex_lock(&regulator->rdev->mutex);
2122         ret = _regulator_is_enabled(regulator->rdev);
2123         mutex_unlock(&regulator->rdev->mutex);
2124
2125         return ret;
2126 }
2127 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2128
2129 /**
2130  * regulator_can_change_voltage - check if regulator can change voltage
2131  * @regulator: regulator source
2132  *
2133  * Returns positive if the regulator driver backing the source/client
2134  * can change its voltage, false otherwise. Usefull for detecting fixed
2135  * or dummy regulators and disabling voltage change logic in the client
2136  * driver.
2137  */
2138 int regulator_can_change_voltage(struct regulator *regulator)
2139 {
2140         struct regulator_dev    *rdev = regulator->rdev;
2141
2142         if (rdev->constraints &&
2143             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2144                 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2145                         return 1;
2146
2147                 if (rdev->desc->continuous_voltage_range &&
2148                     rdev->constraints->min_uV && rdev->constraints->max_uV &&
2149                     rdev->constraints->min_uV != rdev->constraints->max_uV)
2150                         return 1;
2151         }
2152
2153         return 0;
2154 }
2155 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2156
2157 /**
2158  * regulator_count_voltages - count regulator_list_voltage() selectors
2159  * @regulator: regulator source
2160  *
2161  * Returns number of selectors, or negative errno.  Selectors are
2162  * numbered starting at zero, and typically correspond to bitfields
2163  * in hardware registers.
2164  */
2165 int regulator_count_voltages(struct regulator *regulator)
2166 {
2167         struct regulator_dev    *rdev = regulator->rdev;
2168
2169         return rdev->desc->n_voltages ? : -EINVAL;
2170 }
2171 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2172
2173 /**
2174  * regulator_list_voltage - enumerate supported voltages
2175  * @regulator: regulator source
2176  * @selector: identify voltage to list
2177  * Context: can sleep
2178  *
2179  * Returns a voltage that can be passed to @regulator_set_voltage(),
2180  * zero if this selector code can't be used on this system, or a
2181  * negative errno.
2182  */
2183 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2184 {
2185         struct regulator_dev    *rdev = regulator->rdev;
2186         struct regulator_ops    *ops = rdev->desc->ops;
2187         int                     ret;
2188
2189         if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2190                 return rdev->desc->fixed_uV;
2191
2192         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2193                 return -EINVAL;
2194
2195         mutex_lock(&rdev->mutex);
2196         ret = ops->list_voltage(rdev, selector);
2197         mutex_unlock(&rdev->mutex);
2198
2199         if (ret > 0) {
2200                 if (ret < rdev->constraints->min_uV)
2201                         ret = 0;
2202                 else if (ret > rdev->constraints->max_uV)
2203                         ret = 0;
2204         }
2205
2206         return ret;
2207 }
2208 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2209
2210 /**
2211  * regulator_get_linear_step - return the voltage step size between VSEL values
2212  * @regulator: regulator source
2213  *
2214  * Returns the voltage step size between VSEL values for linear
2215  * regulators, or return 0 if the regulator isn't a linear regulator.
2216  */
2217 unsigned int regulator_get_linear_step(struct regulator *regulator)
2218 {
2219         struct regulator_dev *rdev = regulator->rdev;
2220
2221         return rdev->desc->uV_step;
2222 }
2223 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2224
2225 /**
2226  * regulator_is_supported_voltage - check if a voltage range can be supported
2227  *
2228  * @regulator: Regulator to check.
2229  * @min_uV: Minimum required voltage in uV.
2230  * @max_uV: Maximum required voltage in uV.
2231  *
2232  * Returns a boolean or a negative error code.
2233  */
2234 int regulator_is_supported_voltage(struct regulator *regulator,
2235                                    int min_uV, int max_uV)
2236 {
2237         struct regulator_dev *rdev = regulator->rdev;
2238         int i, voltages, ret;
2239
2240         /* If we can't change voltage check the current voltage */
2241         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2242                 ret = regulator_get_voltage(regulator);
2243                 if (ret >= 0)
2244                         return min_uV <= ret && ret <= max_uV;
2245                 else
2246                         return ret;
2247         }
2248
2249         /* Any voltage within constrains range is fine? */
2250         if (rdev->desc->continuous_voltage_range)
2251                 return min_uV >= rdev->constraints->min_uV &&
2252                                 max_uV <= rdev->constraints->max_uV;
2253
2254         ret = regulator_count_voltages(regulator);
2255         if (ret < 0)
2256                 return ret;
2257         voltages = ret;
2258
2259         for (i = 0; i < voltages; i++) {
2260                 ret = regulator_list_voltage(regulator, i);
2261
2262                 if (ret >= min_uV && ret <= max_uV)
2263                         return 1;
2264         }
2265
2266         return 0;
2267 }
2268 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2269
2270 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2271                                      int min_uV, int max_uV)
2272 {
2273         int ret;
2274         int delay = 0;
2275         int best_val = 0;
2276         unsigned int selector;
2277         int old_selector = -1;
2278
2279         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2280
2281         min_uV += rdev->constraints->uV_offset;
2282         max_uV += rdev->constraints->uV_offset;
2283
2284         /*
2285          * If we can't obtain the old selector there is not enough
2286          * info to call set_voltage_time_sel().
2287          */
2288         if (_regulator_is_enabled(rdev) &&
2289             rdev->desc->ops->set_voltage_time_sel &&
2290             rdev->desc->ops->get_voltage_sel) {
2291                 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2292                 if (old_selector < 0)
2293                         return old_selector;
2294         }
2295
2296         if (rdev->desc->ops->set_voltage) {
2297                 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2298                                                    &selector);
2299
2300                 if (ret >= 0) {
2301                         if (rdev->desc->ops->list_voltage)
2302                                 best_val = rdev->desc->ops->list_voltage(rdev,
2303                                                                          selector);
2304                         else
2305                                 best_val = _regulator_get_voltage(rdev);
2306                 }
2307
2308         } else if (rdev->desc->ops->set_voltage_sel) {
2309                 if (rdev->desc->ops->map_voltage) {
2310                         ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2311                                                            max_uV);
2312                 } else {
2313                         if (rdev->desc->ops->list_voltage ==
2314                             regulator_list_voltage_linear)
2315                                 ret = regulator_map_voltage_linear(rdev,
2316                                                                 min_uV, max_uV);
2317                         else
2318                                 ret = regulator_map_voltage_iterate(rdev,
2319                                                                 min_uV, max_uV);
2320                 }
2321
2322                 if (ret >= 0) {
2323                         best_val = rdev->desc->ops->list_voltage(rdev, ret);
2324                         if (min_uV <= best_val && max_uV >= best_val) {
2325                                 selector = ret;
2326                                 if (old_selector == selector)
2327                                         ret = 0;
2328                                 else
2329                                         ret = rdev->desc->ops->set_voltage_sel(
2330                                                                 rdev, ret);
2331                         } else {
2332                                 ret = -EINVAL;
2333                         }
2334                 }
2335         } else {
2336                 ret = -EINVAL;
2337         }
2338
2339         /* Call set_voltage_time_sel if successfully obtained old_selector */
2340         if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2341                 && old_selector != selector) {
2342
2343                 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2344                                                 old_selector, selector);
2345                 if (delay < 0) {
2346                         rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2347                                   delay);
2348                         delay = 0;
2349                 }
2350
2351                 /* Insert any necessary delays */
2352                 if (delay >= 1000) {
2353                         mdelay(delay / 1000);
2354                         udelay(delay % 1000);
2355                 } else if (delay) {
2356                         udelay(delay);
2357                 }
2358         }
2359
2360         if (ret == 0 && best_val >= 0) {
2361                 unsigned long data = best_val;
2362
2363                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2364                                      (void *)data);
2365         }
2366
2367         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2368
2369         return ret;
2370 }
2371
2372 /**
2373  * regulator_set_voltage - set regulator output voltage
2374  * @regulator: regulator source
2375  * @min_uV: Minimum required voltage in uV
2376  * @max_uV: Maximum acceptable voltage in uV
2377  *
2378  * Sets a voltage regulator to the desired output voltage. This can be set
2379  * during any regulator state. IOW, regulator can be disabled or enabled.
2380  *
2381  * If the regulator is enabled then the voltage will change to the new value
2382  * immediately otherwise if the regulator is disabled the regulator will
2383  * output at the new voltage when enabled.
2384  *
2385  * NOTE: If the regulator is shared between several devices then the lowest
2386  * request voltage that meets the system constraints will be used.
2387  * Regulator system constraints must be set for this regulator before
2388  * calling this function otherwise this call will fail.
2389  */
2390 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2391 {
2392         struct regulator_dev *rdev = regulator->rdev;
2393         int ret = 0;
2394         int old_min_uV, old_max_uV;
2395
2396         mutex_lock(&rdev->mutex);
2397
2398         /* If we're setting the same range as last time the change
2399          * should be a noop (some cpufreq implementations use the same
2400          * voltage for multiple frequencies, for example).
2401          */
2402         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2403                 goto out;
2404
2405         /* sanity check */
2406         if (!rdev->desc->ops->set_voltage &&
2407             !rdev->desc->ops->set_voltage_sel) {
2408                 ret = -EINVAL;
2409                 goto out;
2410         }
2411
2412         /* constraints check */
2413         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2414         if (ret < 0)
2415                 goto out;
2416
2417         /* restore original values in case of error */
2418         old_min_uV = regulator->min_uV;
2419         old_max_uV = regulator->max_uV;
2420         regulator->min_uV = min_uV;
2421         regulator->max_uV = max_uV;
2422
2423         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2424         if (ret < 0)
2425                 goto out2;
2426
2427         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2428         if (ret < 0)
2429                 goto out2;
2430
2431 out:
2432         mutex_unlock(&rdev->mutex);
2433         return ret;
2434 out2:
2435         regulator->min_uV = old_min_uV;
2436         regulator->max_uV = old_max_uV;
2437         mutex_unlock(&rdev->mutex);
2438         return ret;
2439 }
2440 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2441
2442 /**
2443  * regulator_set_voltage_time - get raise/fall time
2444  * @regulator: regulator source
2445  * @old_uV: starting voltage in microvolts
2446  * @new_uV: target voltage in microvolts
2447  *
2448  * Provided with the starting and ending voltage, this function attempts to
2449  * calculate the time in microseconds required to rise or fall to this new
2450  * voltage.
2451  */
2452 int regulator_set_voltage_time(struct regulator *regulator,
2453                                int old_uV, int new_uV)
2454 {
2455         struct regulator_dev    *rdev = regulator->rdev;
2456         struct regulator_ops    *ops = rdev->desc->ops;
2457         int old_sel = -1;
2458         int new_sel = -1;
2459         int voltage;
2460         int i;
2461
2462         /* Currently requires operations to do this */
2463         if (!ops->list_voltage || !ops->set_voltage_time_sel
2464             || !rdev->desc->n_voltages)
2465                 return -EINVAL;
2466
2467         for (i = 0; i < rdev->desc->n_voltages; i++) {
2468                 /* We only look for exact voltage matches here */
2469                 voltage = regulator_list_voltage(regulator, i);
2470                 if (voltage < 0)
2471                         return -EINVAL;
2472                 if (voltage == 0)
2473                         continue;
2474                 if (voltage == old_uV)
2475                         old_sel = i;
2476                 if (voltage == new_uV)
2477                         new_sel = i;
2478         }
2479
2480         if (old_sel < 0 || new_sel < 0)
2481                 return -EINVAL;
2482
2483         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2484 }
2485 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2486
2487 /**
2488  * regulator_set_voltage_time_sel - get raise/fall time
2489  * @rdev: regulator source device
2490  * @old_selector: selector for starting voltage
2491  * @new_selector: selector for target voltage
2492  *
2493  * Provided with the starting and target voltage selectors, this function
2494  * returns time in microseconds required to rise or fall to this new voltage
2495  *
2496  * Drivers providing ramp_delay in regulation_constraints can use this as their
2497  * set_voltage_time_sel() operation.
2498  */
2499 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2500                                    unsigned int old_selector,
2501                                    unsigned int new_selector)
2502 {
2503         unsigned int ramp_delay = 0;
2504         int old_volt, new_volt;
2505
2506         if (rdev->constraints->ramp_delay)
2507                 ramp_delay = rdev->constraints->ramp_delay;
2508         else if (rdev->desc->ramp_delay)
2509                 ramp_delay = rdev->desc->ramp_delay;
2510
2511         if (ramp_delay == 0) {
2512                 rdev_warn(rdev, "ramp_delay not set\n");
2513                 return 0;
2514         }
2515
2516         /* sanity check */
2517         if (!rdev->desc->ops->list_voltage)
2518                 return -EINVAL;
2519
2520         old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2521         new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2522
2523         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2524 }
2525 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2526
2527 /**
2528  * regulator_sync_voltage - re-apply last regulator output voltage
2529  * @regulator: regulator source
2530  *
2531  * Re-apply the last configured voltage.  This is intended to be used
2532  * where some external control source the consumer is cooperating with
2533  * has caused the configured voltage to change.
2534  */
2535 int regulator_sync_voltage(struct regulator *regulator)
2536 {
2537         struct regulator_dev *rdev = regulator->rdev;
2538         int ret, min_uV, max_uV;
2539
2540         mutex_lock(&rdev->mutex);
2541
2542         if (!rdev->desc->ops->set_voltage &&
2543             !rdev->desc->ops->set_voltage_sel) {
2544                 ret = -EINVAL;
2545                 goto out;
2546         }
2547
2548         /* This is only going to work if we've had a voltage configured. */
2549         if (!regulator->min_uV && !regulator->max_uV) {
2550                 ret = -EINVAL;
2551                 goto out;
2552         }
2553
2554         min_uV = regulator->min_uV;
2555         max_uV = regulator->max_uV;
2556
2557         /* This should be a paranoia check... */
2558         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2559         if (ret < 0)
2560                 goto out;
2561
2562         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2563         if (ret < 0)
2564                 goto out;
2565
2566         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2567
2568 out:
2569         mutex_unlock(&rdev->mutex);
2570         return ret;
2571 }
2572 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2573
2574 static int _regulator_get_voltage(struct regulator_dev *rdev)
2575 {
2576         int sel, ret;
2577
2578         if (rdev->desc->ops->get_voltage_sel) {
2579                 sel = rdev->desc->ops->get_voltage_sel(rdev);
2580                 if (sel < 0)
2581                         return sel;
2582                 ret = rdev->desc->ops->list_voltage(rdev, sel);
2583         } else if (rdev->desc->ops->get_voltage) {
2584                 ret = rdev->desc->ops->get_voltage(rdev);
2585         } else if (rdev->desc->ops->list_voltage) {
2586                 ret = rdev->desc->ops->list_voltage(rdev, 0);
2587         } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2588                 ret = rdev->desc->fixed_uV;
2589         } else {
2590                 return -EINVAL;
2591         }
2592
2593         if (ret < 0)
2594                 return ret;
2595         return ret - rdev->constraints->uV_offset;
2596 }
2597
2598 /**
2599  * regulator_get_voltage - get regulator output voltage
2600  * @regulator: regulator source
2601  *
2602  * This returns the current regulator voltage in uV.
2603  *
2604  * NOTE: If the regulator is disabled it will return the voltage value. This
2605  * function should not be used to determine regulator state.
2606  */
2607 int regulator_get_voltage(struct regulator *regulator)
2608 {
2609         int ret;
2610
2611         mutex_lock(&regulator->rdev->mutex);
2612
2613         ret = _regulator_get_voltage(regulator->rdev);
2614
2615         mutex_unlock(&regulator->rdev->mutex);
2616
2617         return ret;
2618 }
2619 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2620
2621 /**
2622  * regulator_set_current_limit - set regulator output current limit
2623  * @regulator: regulator source
2624  * @min_uA: Minimum supported current in uA
2625  * @max_uA: Maximum supported current in uA
2626  *
2627  * Sets current sink to the desired output current. This can be set during
2628  * any regulator state. IOW, regulator can be disabled or enabled.
2629  *
2630  * If the regulator is enabled then the current will change to the new value
2631  * immediately otherwise if the regulator is disabled the regulator will
2632  * output at the new current when enabled.
2633  *
2634  * NOTE: Regulator system constraints must be set for this regulator before
2635  * calling this function otherwise this call will fail.
2636  */
2637 int regulator_set_current_limit(struct regulator *regulator,
2638                                int min_uA, int max_uA)
2639 {
2640         struct regulator_dev *rdev = regulator->rdev;
2641         int ret;
2642
2643         mutex_lock(&rdev->mutex);
2644
2645         /* sanity check */
2646         if (!rdev->desc->ops->set_current_limit) {
2647                 ret = -EINVAL;
2648                 goto out;
2649         }
2650
2651         /* constraints check */
2652         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2653         if (ret < 0)
2654                 goto out;
2655
2656         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2657 out:
2658         mutex_unlock(&rdev->mutex);
2659         return ret;
2660 }
2661 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2662
2663 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2664 {
2665         int ret;
2666
2667         mutex_lock(&rdev->mutex);
2668
2669         /* sanity check */
2670         if (!rdev->desc->ops->get_current_limit) {
2671                 ret = -EINVAL;
2672                 goto out;
2673         }
2674
2675         ret = rdev->desc->ops->get_current_limit(rdev);
2676 out:
2677         mutex_unlock(&rdev->mutex);
2678         return ret;
2679 }
2680
2681 /**
2682  * regulator_get_current_limit - get regulator output current
2683  * @regulator: regulator source
2684  *
2685  * This returns the current supplied by the specified current sink in uA.
2686  *
2687  * NOTE: If the regulator is disabled it will return the current value. This
2688  * function should not be used to determine regulator state.
2689  */
2690 int regulator_get_current_limit(struct regulator *regulator)
2691 {
2692         return _regulator_get_current_limit(regulator->rdev);
2693 }
2694 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2695
2696 /**
2697  * regulator_set_mode - set regulator operating mode
2698  * @regulator: regulator source
2699  * @mode: operating mode - one of the REGULATOR_MODE constants
2700  *
2701  * Set regulator operating mode to increase regulator efficiency or improve
2702  * regulation performance.
2703  *
2704  * NOTE: Regulator system constraints must be set for this regulator before
2705  * calling this function otherwise this call will fail.
2706  */
2707 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2708 {
2709         struct regulator_dev *rdev = regulator->rdev;
2710         int ret;
2711         int regulator_curr_mode;
2712
2713         mutex_lock(&rdev->mutex);
2714
2715         /* sanity check */
2716         if (!rdev->desc->ops->set_mode) {
2717                 ret = -EINVAL;
2718                 goto out;
2719         }
2720
2721         /* return if the same mode is requested */
2722         if (rdev->desc->ops->get_mode) {
2723                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2724                 if (regulator_curr_mode == mode) {
2725                         ret = 0;
2726                         goto out;
2727                 }
2728         }
2729
2730         /* constraints check */
2731         ret = regulator_mode_constrain(rdev, &mode);
2732         if (ret < 0)
2733                 goto out;
2734
2735         ret = rdev->desc->ops->set_mode(rdev, mode);
2736 out:
2737         mutex_unlock(&rdev->mutex);
2738         return ret;
2739 }
2740 EXPORT_SYMBOL_GPL(regulator_set_mode);
2741
2742 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2743 {
2744         int ret;
2745
2746         mutex_lock(&rdev->mutex);
2747
2748         /* sanity check */
2749         if (!rdev->desc->ops->get_mode) {
2750                 ret = -EINVAL;
2751                 goto out;
2752         }
2753
2754         ret = rdev->desc->ops->get_mode(rdev);
2755 out:
2756         mutex_unlock(&rdev->mutex);
2757         return ret;
2758 }
2759
2760 /**
2761  * regulator_get_mode - get regulator operating mode
2762  * @regulator: regulator source
2763  *
2764  * Get the current regulator operating mode.
2765  */
2766 unsigned int regulator_get_mode(struct regulator *regulator)
2767 {
2768         return _regulator_get_mode(regulator->rdev);
2769 }
2770 EXPORT_SYMBOL_GPL(regulator_get_mode);
2771
2772 /**
2773  * regulator_set_optimum_mode - set regulator optimum operating mode
2774  * @regulator: regulator source
2775  * @uA_load: load current
2776  *
2777  * Notifies the regulator core of a new device load. This is then used by
2778  * DRMS (if enabled by constraints) to set the most efficient regulator
2779  * operating mode for the new regulator loading.
2780  *
2781  * Consumer devices notify their supply regulator of the maximum power
2782  * they will require (can be taken from device datasheet in the power
2783  * consumption tables) when they change operational status and hence power
2784  * state. Examples of operational state changes that can affect power
2785  * consumption are :-
2786  *
2787  *    o Device is opened / closed.
2788  *    o Device I/O is about to begin or has just finished.
2789  *    o Device is idling in between work.
2790  *
2791  * This information is also exported via sysfs to userspace.
2792  *
2793  * DRMS will sum the total requested load on the regulator and change
2794  * to the most efficient operating mode if platform constraints allow.
2795  *
2796  * Returns the new regulator mode or error.
2797  */
2798 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2799 {
2800         struct regulator_dev *rdev = regulator->rdev;
2801         struct regulator *consumer;
2802         int ret, output_uV, input_uV = 0, total_uA_load = 0;
2803         unsigned int mode;
2804
2805         if (rdev->supply)
2806                 input_uV = regulator_get_voltage(rdev->supply);
2807
2808         mutex_lock(&rdev->mutex);
2809
2810         /*
2811          * first check to see if we can set modes at all, otherwise just
2812          * tell the consumer everything is OK.
2813          */
2814         regulator->uA_load = uA_load;
2815         ret = regulator_check_drms(rdev);
2816         if (ret < 0) {
2817                 ret = 0;
2818                 goto out;
2819         }
2820
2821         if (!rdev->desc->ops->get_optimum_mode)
2822                 goto out;
2823
2824         /*
2825          * we can actually do this so any errors are indicators of
2826          * potential real failure.
2827          */
2828         ret = -EINVAL;
2829
2830         if (!rdev->desc->ops->set_mode)
2831                 goto out;
2832
2833         /* get output voltage */
2834         output_uV = _regulator_get_voltage(rdev);
2835         if (output_uV <= 0) {
2836                 rdev_err(rdev, "invalid output voltage found\n");
2837                 goto out;
2838         }
2839
2840         /* No supply? Use constraint voltage */
2841         if (input_uV <= 0)
2842                 input_uV = rdev->constraints->input_uV;
2843         if (input_uV <= 0) {
2844                 rdev_err(rdev, "invalid input voltage found\n");
2845                 goto out;
2846         }
2847
2848         /* calc total requested load for this regulator */
2849         list_for_each_entry(consumer, &rdev->consumer_list, list)
2850                 total_uA_load += consumer->uA_load;
2851
2852         mode = rdev->desc->ops->get_optimum_mode(rdev,
2853                                                  input_uV, output_uV,
2854                                                  total_uA_load);
2855         ret = regulator_mode_constrain(rdev, &mode);
2856         if (ret < 0) {
2857                 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2858                          total_uA_load, input_uV, output_uV);
2859                 goto out;
2860         }
2861
2862         ret = rdev->desc->ops->set_mode(rdev, mode);
2863         if (ret < 0) {
2864                 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2865                 goto out;
2866         }
2867         ret = mode;
2868 out:
2869         mutex_unlock(&rdev->mutex);
2870         return ret;
2871 }
2872 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2873
2874 /**
2875  * regulator_allow_bypass - allow the regulator to go into bypass mode
2876  *
2877  * @regulator: Regulator to configure
2878  * @enable: enable or disable bypass mode
2879  *
2880  * Allow the regulator to go into bypass mode if all other consumers
2881  * for the regulator also enable bypass mode and the machine
2882  * constraints allow this.  Bypass mode means that the regulator is
2883  * simply passing the input directly to the output with no regulation.
2884  */
2885 int regulator_allow_bypass(struct regulator *regulator, bool enable)
2886 {
2887         struct regulator_dev *rdev = regulator->rdev;
2888         int ret = 0;
2889
2890         if (!rdev->desc->ops->set_bypass)
2891                 return 0;
2892
2893         if (rdev->constraints &&
2894             !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2895                 return 0;
2896
2897         mutex_lock(&rdev->mutex);
2898
2899         if (enable && !regulator->bypass) {
2900                 rdev->bypass_count++;
2901
2902                 if (rdev->bypass_count == rdev->open_count) {
2903                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2904                         if (ret != 0)
2905                                 rdev->bypass_count--;
2906                 }
2907
2908         } else if (!enable && regulator->bypass) {
2909                 rdev->bypass_count--;
2910
2911                 if (rdev->bypass_count != rdev->open_count) {
2912                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2913                         if (ret != 0)
2914                                 rdev->bypass_count++;
2915                 }
2916         }
2917
2918         if (ret == 0)
2919                 regulator->bypass = enable;
2920
2921         mutex_unlock(&rdev->mutex);
2922
2923         return ret;
2924 }
2925 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2926
2927 /**
2928  * regulator_register_notifier - register regulator event notifier
2929  * @regulator: regulator source
2930  * @nb: notifier block
2931  *
2932  * Register notifier block to receive regulator events.
2933  */
2934 int regulator_register_notifier(struct regulator *regulator,
2935                               struct notifier_block *nb)
2936 {
2937         return blocking_notifier_chain_register(&regulator->rdev->notifier,
2938                                                 nb);
2939 }
2940 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2941
2942 /**
2943  * regulator_unregister_notifier - unregister regulator event notifier
2944  * @regulator: regulator source
2945  * @nb: notifier block
2946  *
2947  * Unregister regulator event notifier block.
2948  */
2949 int regulator_unregister_notifier(struct regulator *regulator,
2950                                 struct notifier_block *nb)
2951 {
2952         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2953                                                   nb);
2954 }
2955 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2956
2957 /* notify regulator consumers and downstream regulator consumers.
2958  * Note mutex must be held by caller.
2959  */
2960 static void _notifier_call_chain(struct regulator_dev *rdev,
2961                                   unsigned long event, void *data)
2962 {
2963         /* call rdev chain first */
2964         blocking_notifier_call_chain(&rdev->notifier, event, data);
2965 }
2966
2967 /**
2968  * regulator_bulk_get - get multiple regulator consumers
2969  *
2970  * @dev:           Device to supply
2971  * @num_consumers: Number of consumers to register
2972  * @consumers:     Configuration of consumers; clients are stored here.
2973  *
2974  * @return 0 on success, an errno on failure.
2975  *
2976  * This helper function allows drivers to get several regulator
2977  * consumers in one operation.  If any of the regulators cannot be
2978  * acquired then any regulators that were allocated will be freed
2979  * before returning to the caller.
2980  */
2981 int regulator_bulk_get(struct device *dev, int num_consumers,
2982                        struct regulator_bulk_data *consumers)
2983 {
2984         int i;
2985         int ret;
2986
2987         for (i = 0; i < num_consumers; i++)
2988                 consumers[i].consumer = NULL;
2989
2990         for (i = 0; i < num_consumers; i++) {
2991                 consumers[i].consumer = regulator_get(dev,
2992                                                       consumers[i].supply);
2993                 if (IS_ERR(consumers[i].consumer)) {
2994                         ret = PTR_ERR(consumers[i].consumer);
2995                         dev_err(dev, "Failed to get supply '%s': %d\n",
2996                                 consumers[i].supply, ret);
2997                         consumers[i].consumer = NULL;
2998                         goto err;
2999                 }
3000         }
3001
3002         return 0;
3003
3004 err:
3005         while (--i >= 0)
3006                 regulator_put(consumers[i].consumer);
3007
3008         return ret;
3009 }
3010 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3011
3012 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3013 {
3014         struct regulator_bulk_data *bulk = data;
3015
3016         bulk->ret = regulator_enable(bulk->consumer);
3017 }
3018
3019 /**
3020  * regulator_bulk_enable - enable multiple regulator consumers
3021  *
3022  * @num_consumers: Number of consumers
3023  * @consumers:     Consumer data; clients are stored here.
3024  * @return         0 on success, an errno on failure
3025  *
3026  * This convenience API allows consumers to enable multiple regulator
3027  * clients in a single API call.  If any consumers cannot be enabled
3028  * then any others that were enabled will be disabled again prior to
3029  * return.
3030  */
3031 int regulator_bulk_enable(int num_consumers,
3032                           struct regulator_bulk_data *consumers)
3033 {
3034         ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3035         int i;
3036         int ret = 0;
3037
3038         for (i = 0; i < num_consumers; i++) {
3039                 if (consumers[i].consumer->always_on)
3040                         consumers[i].ret = 0;
3041                 else
3042                         async_schedule_domain(regulator_bulk_enable_async,
3043                                               &consumers[i], &async_domain);
3044         }
3045
3046         async_synchronize_full_domain(&async_domain);
3047
3048         /* If any consumer failed we need to unwind any that succeeded */
3049         for (i = 0; i < num_consumers; i++) {
3050                 if (consumers[i].ret != 0) {
3051                         ret = consumers[i].ret;
3052                         goto err;
3053                 }
3054         }
3055
3056         return 0;
3057
3058 err:
3059         for (i = 0; i < num_consumers; i++) {
3060                 if (consumers[i].ret < 0)
3061                         pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3062                                consumers[i].ret);
3063                 else
3064                         regulator_disable(consumers[i].consumer);
3065         }
3066
3067         return ret;
3068 }
3069 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3070
3071 /**
3072  * regulator_bulk_disable - disable multiple regulator consumers
3073  *
3074  * @num_consumers: Number of consumers
3075  * @consumers:     Consumer data; clients are stored here.
3076  * @return         0 on success, an errno on failure
3077  *
3078  * This convenience API allows consumers to disable multiple regulator
3079  * clients in a single API call.  If any consumers cannot be disabled
3080  * then any others that were disabled will be enabled again prior to
3081  * return.
3082  */
3083 int regulator_bulk_disable(int num_consumers,
3084                            struct regulator_bulk_data *consumers)
3085 {
3086         int i;
3087         int ret, r;
3088
3089         for (i = num_consumers - 1; i >= 0; --i) {
3090                 ret = regulator_disable(consumers[i].consumer);
3091                 if (ret != 0)
3092                         goto err;
3093         }
3094
3095         return 0;
3096
3097 err:
3098         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3099         for (++i; i < num_consumers; ++i) {
3100                 r = regulator_enable(consumers[i].consumer);
3101                 if (r != 0)
3102                         pr_err("Failed to reename %s: %d\n",
3103                                consumers[i].supply, r);
3104         }
3105
3106         return ret;
3107 }
3108 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3109
3110 /**
3111  * regulator_bulk_force_disable - force disable multiple regulator consumers
3112  *
3113  * @num_consumers: Number of consumers
3114  * @consumers:     Consumer data; clients are stored here.
3115  * @return         0 on success, an errno on failure
3116  *
3117  * This convenience API allows consumers to forcibly disable multiple regulator
3118  * clients in a single API call.
3119  * NOTE: This should be used for situations when device damage will
3120  * likely occur if the regulators are not disabled (e.g. over temp).
3121  * Although regulator_force_disable function call for some consumers can
3122  * return error numbers, the function is called for all consumers.
3123  */
3124 int regulator_bulk_force_disable(int num_consumers,
3125                            struct regulator_bulk_data *consumers)
3126 {
3127         int i;
3128         int ret;
3129
3130         for (i = 0; i < num_consumers; i++)
3131                 consumers[i].ret =
3132                             regulator_force_disable(consumers[i].consumer);
3133
3134         for (i = 0; i < num_consumers; i++) {
3135                 if (consumers[i].ret != 0) {
3136                         ret = consumers[i].ret;
3137                         goto out;
3138                 }
3139         }
3140
3141         return 0;
3142 out:
3143         return ret;
3144 }
3145 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3146
3147 /**
3148  * regulator_bulk_free - free multiple regulator consumers
3149  *
3150  * @num_consumers: Number of consumers
3151  * @consumers:     Consumer data; clients are stored here.
3152  *
3153  * This convenience API allows consumers to free multiple regulator
3154  * clients in a single API call.
3155  */
3156 void regulator_bulk_free(int num_consumers,
3157                          struct regulator_bulk_data *consumers)
3158 {
3159         int i;
3160
3161         for (i = 0; i < num_consumers; i++) {
3162                 regulator_put(consumers[i].consumer);
3163                 consumers[i].consumer = NULL;
3164         }
3165 }
3166 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3167
3168 /**
3169  * regulator_notifier_call_chain - call regulator event notifier
3170  * @rdev: regulator source
3171  * @event: notifier block
3172  * @data: callback-specific data.
3173  *
3174  * Called by regulator drivers to notify clients a regulator event has
3175  * occurred. We also notify regulator clients downstream.
3176  * Note lock must be held by caller.
3177  */
3178 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3179                                   unsigned long event, void *data)
3180 {
3181         _notifier_call_chain(rdev, event, data);
3182         return NOTIFY_DONE;
3183
3184 }
3185 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3186
3187 /**
3188  * regulator_mode_to_status - convert a regulator mode into a status
3189  *
3190  * @mode: Mode to convert
3191  *
3192  * Convert a regulator mode into a status.
3193  */
3194 int regulator_mode_to_status(unsigned int mode)
3195 {
3196         switch (mode) {
3197         case REGULATOR_MODE_FAST:
3198                 return REGULATOR_STATUS_FAST;
3199         case REGULATOR_MODE_NORMAL:
3200                 return REGULATOR_STATUS_NORMAL;
3201         case REGULATOR_MODE_IDLE:
3202                 return REGULATOR_STATUS_IDLE;
3203         case REGULATOR_MODE_STANDBY:
3204                 return REGULATOR_STATUS_STANDBY;
3205         default:
3206                 return REGULATOR_STATUS_UNDEFINED;
3207         }
3208 }
3209 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3210
3211 /*
3212  * To avoid cluttering sysfs (and memory) with useless state, only
3213  * create attributes that can be meaningfully displayed.
3214  */
3215 static int add_regulator_attributes(struct regulator_dev *rdev)
3216 {
3217         struct device           *dev = &rdev->dev;
3218         struct regulator_ops    *ops = rdev->desc->ops;
3219         int                     status = 0;
3220
3221         /* some attributes need specific methods to be displayed */
3222         if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3223             (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3224             (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3225                 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) {
3226                 status = device_create_file(dev, &dev_attr_microvolts);
3227                 if (status < 0)
3228                         return status;
3229         }
3230         if (ops->get_current_limit) {
3231                 status = device_create_file(dev, &dev_attr_microamps);
3232                 if (status < 0)
3233                         return status;
3234         }
3235         if (ops->get_mode) {
3236                 status = device_create_file(dev, &dev_attr_opmode);
3237                 if (status < 0)
3238                         return status;
3239         }
3240         if (rdev->ena_pin || ops->is_enabled) {
3241                 status = device_create_file(dev, &dev_attr_state);
3242                 if (status < 0)
3243                         return status;
3244         }
3245         if (ops->get_status) {
3246                 status = device_create_file(dev, &dev_attr_status);
3247                 if (status < 0)
3248                         return status;
3249         }
3250         if (ops->get_bypass) {
3251                 status = device_create_file(dev, &dev_attr_bypass);
3252                 if (status < 0)
3253                         return status;
3254         }
3255
3256         /* some attributes are type-specific */
3257         if (rdev->desc->type == REGULATOR_CURRENT) {
3258                 status = device_create_file(dev, &dev_attr_requested_microamps);
3259                 if (status < 0)
3260                         return status;
3261         }
3262
3263         /* all the other attributes exist to support constraints;
3264          * don't show them if there are no constraints, or if the
3265          * relevant supporting methods are missing.
3266          */
3267         if (!rdev->constraints)
3268                 return status;
3269
3270         /* constraints need specific supporting methods */
3271         if (ops->set_voltage || ops->set_voltage_sel) {
3272                 status = device_create_file(dev, &dev_attr_min_microvolts);
3273                 if (status < 0)
3274                         return status;
3275                 status = device_create_file(dev, &dev_attr_max_microvolts);
3276                 if (status < 0)
3277                         return status;
3278         }
3279         if (ops->set_current_limit) {
3280                 status = device_create_file(dev, &dev_attr_min_microamps);
3281                 if (status < 0)
3282                         return status;
3283                 status = device_create_file(dev, &dev_attr_max_microamps);
3284                 if (status < 0)
3285                         return status;
3286         }
3287
3288         status = device_create_file(dev, &dev_attr_suspend_standby_state);
3289         if (status < 0)
3290                 return status;
3291         status = device_create_file(dev, &dev_attr_suspend_mem_state);
3292         if (status < 0)
3293                 return status;
3294         status = device_create_file(dev, &dev_attr_suspend_disk_state);
3295         if (status < 0)
3296                 return status;
3297
3298         if (ops->set_suspend_voltage) {
3299                 status = device_create_file(dev,
3300                                 &dev_attr_suspend_standby_microvolts);
3301                 if (status < 0)
3302                         return status;
3303                 status = device_create_file(dev,
3304                                 &dev_attr_suspend_mem_microvolts);
3305                 if (status < 0)
3306                         return status;
3307                 status = device_create_file(dev,
3308                                 &dev_attr_suspend_disk_microvolts);
3309                 if (status < 0)
3310                         return status;
3311         }
3312
3313         if (ops->set_suspend_mode) {
3314                 status = device_create_file(dev,
3315                                 &dev_attr_suspend_standby_mode);
3316                 if (status < 0)
3317                         return status;
3318                 status = device_create_file(dev,
3319                                 &dev_attr_suspend_mem_mode);
3320                 if (status < 0)
3321                         return status;
3322                 status = device_create_file(dev,
3323                                 &dev_attr_suspend_disk_mode);
3324                 if (status < 0)
3325                         return status;
3326         }
3327
3328         return status;
3329 }
3330
3331 static void rdev_init_debugfs(struct regulator_dev *rdev)
3332 {
3333         rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3334         if (!rdev->debugfs) {
3335                 rdev_warn(rdev, "Failed to create debugfs directory\n");
3336                 return;
3337         }
3338
3339         debugfs_create_u32("use_count", 0444, rdev->debugfs,
3340                            &rdev->use_count);
3341         debugfs_create_u32("open_count", 0444, rdev->debugfs,
3342                            &rdev->open_count);
3343         debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3344                            &rdev->bypass_count);
3345 }
3346
3347 /**
3348  * regulator_register - register regulator
3349  * @regulator_desc: regulator to register
3350  * @config: runtime configuration for regulator
3351  *
3352  * Called by regulator drivers to register a regulator.
3353  * Returns a valid pointer to struct regulator_dev on success
3354  * or an ERR_PTR() on error.
3355  */
3356 struct regulator_dev *
3357 regulator_register(const struct regulator_desc *regulator_desc,
3358                    const struct regulator_config *config)
3359 {
3360         const struct regulation_constraints *constraints = NULL;
3361         const struct regulator_init_data *init_data;
3362         static atomic_t regulator_no = ATOMIC_INIT(0);
3363         struct regulator_dev *rdev;
3364         struct device *dev;
3365         int ret, i;
3366         const char *supply = NULL;
3367
3368         if (regulator_desc == NULL || config == NULL)
3369                 return ERR_PTR(-EINVAL);
3370
3371         dev = config->dev;
3372         WARN_ON(!dev);
3373
3374         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3375                 return ERR_PTR(-EINVAL);
3376
3377         if (regulator_desc->type != REGULATOR_VOLTAGE &&
3378             regulator_desc->type != REGULATOR_CURRENT)
3379                 return ERR_PTR(-EINVAL);
3380
3381         /* Only one of each should be implemented */
3382         WARN_ON(regulator_desc->ops->get_voltage &&
3383                 regulator_desc->ops->get_voltage_sel);
3384         WARN_ON(regulator_desc->ops->set_voltage &&
3385                 regulator_desc->ops->set_voltage_sel);
3386
3387         /* If we're using selectors we must implement list_voltage. */
3388         if (regulator_desc->ops->get_voltage_sel &&
3389             !regulator_desc->ops->list_voltage) {
3390                 return ERR_PTR(-EINVAL);
3391         }
3392         if (regulator_desc->ops->set_voltage_sel &&
3393             !regulator_desc->ops->list_voltage) {
3394                 return ERR_PTR(-EINVAL);
3395         }
3396
3397         init_data = config->init_data;
3398
3399         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3400         if (rdev == NULL)
3401                 return ERR_PTR(-ENOMEM);
3402
3403         mutex_lock(&regulator_list_mutex);
3404
3405         mutex_init(&rdev->mutex);
3406         rdev->reg_data = config->driver_data;
3407         rdev->owner = regulator_desc->owner;
3408         rdev->desc = regulator_desc;
3409         if (config->regmap)
3410                 rdev->regmap = config->regmap;
3411         else if (dev_get_regmap(dev, NULL))
3412                 rdev->regmap = dev_get_regmap(dev, NULL);
3413         else if (dev->parent)
3414                 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3415         INIT_LIST_HEAD(&rdev->consumer_list);
3416         INIT_LIST_HEAD(&rdev->list);
3417         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3418         INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3419
3420         /* preform any regulator specific init */
3421         if (init_data && init_data->regulator_init) {
3422                 ret = init_data->regulator_init(rdev->reg_data);
3423                 if (ret < 0)
3424                         goto clean;
3425         }
3426
3427         /* register with sysfs */
3428         rdev->dev.class = &regulator_class;
3429         rdev->dev.of_node = config->of_node;
3430         rdev->dev.parent = dev;
3431         dev_set_name(&rdev->dev, "regulator.%d",
3432                      atomic_inc_return(&regulator_no) - 1);
3433         ret = device_register(&rdev->dev);
3434         if (ret != 0) {
3435                 put_device(&rdev->dev);
3436                 goto clean;
3437         }
3438
3439         dev_set_drvdata(&rdev->dev, rdev);
3440
3441         if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3442                 ret = regulator_ena_gpio_request(rdev, config);
3443                 if (ret != 0) {
3444                         rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3445                                  config->ena_gpio, ret);
3446                         goto wash;
3447                 }
3448
3449                 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3450                         rdev->ena_gpio_state = 1;
3451
3452                 if (config->ena_gpio_invert)
3453                         rdev->ena_gpio_state = !rdev->ena_gpio_state;
3454         }
3455
3456         /* set regulator constraints */
3457         if (init_data)
3458                 constraints = &init_data->constraints;
3459
3460         ret = set_machine_constraints(rdev, constraints);
3461         if (ret < 0)
3462                 goto scrub;
3463
3464         /* add attributes supported by this regulator */
3465         ret = add_regulator_attributes(rdev);
3466         if (ret < 0)
3467                 goto scrub;
3468
3469         if (init_data && init_data->supply_regulator)
3470                 supply = init_data->supply_regulator;
3471         else if (regulator_desc->supply_name)
3472                 supply = regulator_desc->supply_name;
3473
3474         if (supply) {
3475                 struct regulator_dev *r;
3476
3477                 r = regulator_dev_lookup(dev, supply, &ret);
3478
3479                 if (ret == -ENODEV) {
3480                         /*
3481                          * No supply was specified for this regulator and
3482                          * there will never be one.
3483                          */
3484                         ret = 0;
3485                         goto add_dev;
3486                 } else if (!r) {
3487                         dev_err(dev, "Failed to find supply %s\n", supply);
3488                         ret = -EPROBE_DEFER;
3489                         goto scrub;
3490                 }
3491
3492                 ret = set_supply(rdev, r);
3493                 if (ret < 0)
3494                         goto scrub;
3495
3496                 /* Enable supply if rail is enabled */
3497                 if (_regulator_is_enabled(rdev)) {
3498                         ret = regulator_enable(rdev->supply);
3499                         if (ret < 0)
3500                                 goto scrub;
3501                 }
3502         }
3503
3504 add_dev:
3505         /* add consumers devices */
3506         if (init_data) {
3507                 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3508                         ret = set_consumer_device_supply(rdev,
3509                                 init_data->consumer_supplies[i].dev_name,
3510                                 init_data->consumer_supplies[i].supply);
3511                         if (ret < 0) {
3512                                 dev_err(dev, "Failed to set supply %s\n",
3513                                         init_data->consumer_supplies[i].supply);
3514                                 goto unset_supplies;
3515                         }
3516                 }
3517         }
3518
3519         list_add(&rdev->list, &regulator_list);
3520
3521         rdev_init_debugfs(rdev);
3522 out:
3523         mutex_unlock(&regulator_list_mutex);
3524         return rdev;
3525
3526 unset_supplies:
3527         unset_regulator_supplies(rdev);
3528
3529 scrub:
3530         if (rdev->supply)
3531                 _regulator_put(rdev->supply);
3532         regulator_ena_gpio_free(rdev);
3533         kfree(rdev->constraints);
3534 wash:
3535         device_unregister(&rdev->dev);
3536         /* device core frees rdev */
3537         rdev = ERR_PTR(ret);
3538         goto out;
3539
3540 clean:
3541         kfree(rdev);
3542         rdev = ERR_PTR(ret);
3543         goto out;
3544 }
3545 EXPORT_SYMBOL_GPL(regulator_register);
3546
3547 /**
3548  * regulator_unregister - unregister regulator
3549  * @rdev: regulator to unregister
3550  *
3551  * Called by regulator drivers to unregister a regulator.
3552  */
3553 void regulator_unregister(struct regulator_dev *rdev)
3554 {
3555         if (rdev == NULL)
3556                 return;
3557
3558         if (rdev->supply) {
3559                 while (rdev->use_count--)
3560                         regulator_disable(rdev->supply);
3561                 regulator_put(rdev->supply);
3562         }
3563         mutex_lock(&regulator_list_mutex);
3564         debugfs_remove_recursive(rdev->debugfs);
3565         flush_work(&rdev->disable_work.work);
3566         WARN_ON(rdev->open_count);
3567         unset_regulator_supplies(rdev);
3568         list_del(&rdev->list);
3569         kfree(rdev->constraints);
3570         regulator_ena_gpio_free(rdev);
3571         device_unregister(&rdev->dev);
3572         mutex_unlock(&regulator_list_mutex);
3573 }
3574 EXPORT_SYMBOL_GPL(regulator_unregister);
3575
3576 /**
3577  * regulator_suspend_prepare - prepare regulators for system wide suspend
3578  * @state: system suspend state
3579  *
3580  * Configure each regulator with it's suspend operating parameters for state.
3581  * This will usually be called by machine suspend code prior to supending.
3582  */
3583 int regulator_suspend_prepare(suspend_state_t state)
3584 {
3585         struct regulator_dev *rdev;
3586         int ret = 0;
3587
3588         /* ON is handled by regulator active state */
3589         if (state == PM_SUSPEND_ON)
3590                 return -EINVAL;
3591
3592         mutex_lock(&regulator_list_mutex);
3593         list_for_each_entry(rdev, &regulator_list, list) {
3594
3595                 mutex_lock(&rdev->mutex);
3596                 ret = suspend_prepare(rdev, state);
3597                 mutex_unlock(&rdev->mutex);
3598
3599                 if (ret < 0) {
3600                         rdev_err(rdev, "failed to prepare\n");
3601                         goto out;
3602                 }
3603         }
3604 out:
3605         mutex_unlock(&regulator_list_mutex);
3606         return ret;
3607 }
3608 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3609
3610 /**
3611  * regulator_suspend_finish - resume regulators from system wide suspend
3612  *
3613  * Turn on regulators that might be turned off by regulator_suspend_prepare
3614  * and that should be turned on according to the regulators properties.
3615  */
3616 int regulator_suspend_finish(void)
3617 {
3618         struct regulator_dev *rdev;
3619         int ret = 0, error;
3620
3621         mutex_lock(&regulator_list_mutex);
3622         list_for_each_entry(rdev, &regulator_list, list) {
3623                 mutex_lock(&rdev->mutex);
3624                 if (rdev->use_count > 0  || rdev->constraints->always_on) {
3625                         error = _regulator_do_enable(rdev);
3626                         if (error)
3627                                 ret = error;
3628                 } else {
3629                         if (!have_full_constraints())
3630                                 goto unlock;
3631                         if (!_regulator_is_enabled(rdev))
3632                                 goto unlock;
3633
3634                         error = _regulator_do_disable(rdev);
3635                         if (error)
3636                                 ret = error;
3637                 }
3638 unlock:
3639                 mutex_unlock(&rdev->mutex);
3640         }
3641         mutex_unlock(&regulator_list_mutex);
3642         return ret;
3643 }
3644 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3645
3646 /**
3647  * regulator_has_full_constraints - the system has fully specified constraints
3648  *
3649  * Calling this function will cause the regulator API to disable all
3650  * regulators which have a zero use count and don't have an always_on
3651  * constraint in a late_initcall.
3652  *
3653  * The intention is that this will become the default behaviour in a
3654  * future kernel release so users are encouraged to use this facility
3655  * now.
3656  */
3657 void regulator_has_full_constraints(void)
3658 {
3659         has_full_constraints = 1;
3660 }
3661 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3662
3663 /**
3664  * rdev_get_drvdata - get rdev regulator driver data
3665  * @rdev: regulator
3666  *
3667  * Get rdev regulator driver private data. This call can be used in the
3668  * regulator driver context.
3669  */
3670 void *rdev_get_drvdata(struct regulator_dev *rdev)
3671 {
3672         return rdev->reg_data;
3673 }
3674 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3675
3676 /**
3677  * regulator_get_drvdata - get regulator driver data
3678  * @regulator: regulator
3679  *
3680  * Get regulator driver private data. This call can be used in the consumer
3681  * driver context when non API regulator specific functions need to be called.
3682  */
3683 void *regulator_get_drvdata(struct regulator *regulator)
3684 {
3685         return regulator->rdev->reg_data;
3686 }
3687 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3688
3689 /**
3690  * regulator_set_drvdata - set regulator driver data
3691  * @regulator: regulator
3692  * @data: data
3693  */
3694 void regulator_set_drvdata(struct regulator *regulator, void *data)
3695 {
3696         regulator->rdev->reg_data = data;
3697 }
3698 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3699
3700 /**
3701  * regulator_get_id - get regulator ID
3702  * @rdev: regulator
3703  */
3704 int rdev_get_id(struct regulator_dev *rdev)
3705 {
3706         return rdev->desc->id;
3707 }
3708 EXPORT_SYMBOL_GPL(rdev_get_id);
3709
3710 struct device *rdev_get_dev(struct regulator_dev *rdev)
3711 {
3712         return &rdev->dev;
3713 }
3714 EXPORT_SYMBOL_GPL(rdev_get_dev);
3715
3716 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3717 {
3718         return reg_init_data->driver_data;
3719 }
3720 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3721
3722 #ifdef CONFIG_DEBUG_FS
3723 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3724                                     size_t count, loff_t *ppos)
3725 {
3726         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3727         ssize_t len, ret = 0;
3728         struct regulator_map *map;
3729
3730         if (!buf)
3731                 return -ENOMEM;
3732
3733         list_for_each_entry(map, &regulator_map_list, list) {
3734                 len = snprintf(buf + ret, PAGE_SIZE - ret,
3735                                "%s -> %s.%s\n",
3736                                rdev_get_name(map->regulator), map->dev_name,
3737                                map->supply);
3738                 if (len >= 0)
3739                         ret += len;
3740                 if (ret > PAGE_SIZE) {
3741                         ret = PAGE_SIZE;
3742                         break;
3743                 }
3744         }
3745
3746         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3747
3748         kfree(buf);
3749
3750         return ret;
3751 }
3752 #endif
3753
3754 static const struct file_operations supply_map_fops = {
3755 #ifdef CONFIG_DEBUG_FS
3756         .read = supply_map_read_file,
3757         .llseek = default_llseek,
3758 #endif
3759 };
3760
3761 static int __init regulator_init(void)
3762 {
3763         int ret;
3764
3765         ret = class_register(&regulator_class);
3766
3767         debugfs_root = debugfs_create_dir("regulator", NULL);
3768         if (!debugfs_root)
3769                 pr_warn("regulator: Failed to create debugfs directory\n");
3770
3771         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3772                             &supply_map_fops);
3773
3774         regulator_dummy_init();
3775
3776         return ret;
3777 }
3778
3779 /* init early to allow our consumers to complete system booting */
3780 core_initcall(regulator_init);
3781
3782 static int __init regulator_init_complete(void)
3783 {
3784         struct regulator_dev *rdev;
3785         struct regulator_ops *ops;
3786         struct regulation_constraints *c;
3787         int enabled, ret;
3788
3789         /*
3790          * Since DT doesn't provide an idiomatic mechanism for
3791          * enabling full constraints and since it's much more natural
3792          * with DT to provide them just assume that a DT enabled
3793          * system has full constraints.
3794          */
3795         if (of_have_populated_dt())
3796                 has_full_constraints = true;
3797
3798         mutex_lock(&regulator_list_mutex);
3799
3800         /* If we have a full configuration then disable any regulators
3801          * which are not in use or always_on.  This will become the
3802          * default behaviour in the future.
3803          */
3804         list_for_each_entry(rdev, &regulator_list, list) {
3805                 ops = rdev->desc->ops;
3806                 c = rdev->constraints;
3807
3808                 if (c && c->always_on)
3809                         continue;
3810
3811                 mutex_lock(&rdev->mutex);
3812
3813                 if (rdev->use_count)
3814                         goto unlock;
3815
3816                 /* If we can't read the status assume it's on. */
3817                 if (ops->is_enabled)
3818                         enabled = ops->is_enabled(rdev);
3819                 else
3820                         enabled = 1;
3821
3822                 if (!enabled)
3823                         goto unlock;
3824
3825                 if (have_full_constraints()) {
3826                         /* We log since this may kill the system if it
3827                          * goes wrong. */
3828                         rdev_info(rdev, "disabling\n");
3829                         ret = _regulator_do_disable(rdev);
3830                         if (ret != 0)
3831                                 rdev_err(rdev, "couldn't disable: %d\n", ret);
3832                 } else {
3833                         /* The intention is that in future we will
3834                          * assume that full constraints are provided
3835                          * so warn even if we aren't going to do
3836                          * anything here.
3837                          */
3838                         rdev_warn(rdev, "incomplete constraints, leaving on\n");
3839                 }
3840
3841 unlock:
3842                 mutex_unlock(&rdev->mutex);
3843         }
3844
3845         mutex_unlock(&regulator_list_mutex);
3846
3847         return 0;
3848 }
3849 late_initcall(regulator_init_complete);