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/gpio/consumer.h>
  28 #include <linux/of.h>
  29 #include <linux/regmap.h>
  30 #include <linux/regulator/of_regulator.h>
  31 #include <linux/regulator/consumer.h>
  32 #include <linux/regulator/driver.h>
  33 #include <linux/regulator/machine.h>
  34 #include <linux/module.h>
  35
  36 #define CREATE_TRACE_POINTS
  37 #include <trace/events/regulator.h>
  38
  39 #include "dummy.h"
  40 #include "internal.h"
  41
  42 #define rdev_crit(rdev, fmt, ...)                                       \
  43         pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  44 #define rdev_err(rdev, fmt, ...)                                        \
  45         pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  46 #define rdev_warn(rdev, fmt, ...)                                       \
  47         pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  48 #define rdev_info(rdev, fmt, ...)                                       \
  49         pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  50 #define rdev_dbg(rdev, fmt, ...)                                        \
  51         pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  52
  53 static DEFINE_MUTEX(regulator_list_mutex);
  54 static LIST_HEAD(regulator_list);
  55 static LIST_HEAD(regulator_map_list);
  56 static LIST_HEAD(regulator_ena_gpio_list);
  57 static LIST_HEAD(regulator_supply_alias_list);
  58 static bool has_full_constraints;
  59
  60 static struct dentry *debugfs_root;
  61
  62 /*
  63  * struct regulator_map
  64  *
  65  * Used to provide symbolic supply names to devices.
  66  */
  67 struct regulator_map {
  68         struct list_head list;
  69         const char *dev_name;   /* The dev_name() for the consumer */
  70         const char *supply;
  71         struct regulator_dev *regulator;
  72 };
  73
  74 /*
  75  * struct regulator_enable_gpio
  76  *
  77  * Management for shared enable GPIO pin
  78  */
  79 struct regulator_enable_gpio {
  80         struct list_head list;
  81         struct gpio_desc *gpiod;
  82         u32 enable_count;       /* a number of enabled shared GPIO */
  83         u32 request_count;      /* a number of requested shared GPIO */
  84         unsigned int ena_gpio_invert:1;
  85 };
  86
  87 /*
  88  * struct regulator_supply_alias
  89  *
  90  * Used to map lookups for a supply onto an alternative device.
  91  */
  92 struct regulator_supply_alias {
  93         struct list_head list;
  94         struct device *src_dev;
  95         const char *src_supply;
  96         struct device *alias_dev;
  97         const char *alias_supply;
  98 };
  99
 100 static int _regulator_is_enabled(struct regulator_dev *rdev);
 101 static int _regulator_disable(struct regulator_dev *rdev);
 102 static int _regulator_get_voltage(struct regulator_dev *rdev);
 103 static int _regulator_get_current_limit(struct regulator_dev *rdev);
 104 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
 105 static int _notifier_call_chain(struct regulator_dev *rdev,
 106                                   unsigned long event, void *data);
 107 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 108                                      int min_uV, int max_uV);
 109 static struct regulator *create_regulator(struct regulator_dev *rdev,
 110                                           struct device *dev,
 111                                           const char *supply_name);
 112
 113 static const char *rdev_get_name(struct regulator_dev *rdev)
 114 {
 115         if (rdev->constraints && rdev->constraints->name)
 116                 return rdev->constraints->name;
 117         else if (rdev->desc->name)
 118                 return rdev->desc->name;
 119         else
 120                 return "";
 121 }
 122
 123 static bool have_full_constraints(void)
 124 {
 125         return has_full_constraints || of_have_populated_dt();
 126 }
 127
 128 /**
 129  * of_get_regulator - get a regulator device node based on supply name
 130  * @dev: Device pointer for the consumer (of regulator) device
 131  * @supply: regulator supply name
 132  *
 133  * Extract the regulator device node corresponding to the supply name.
 134  * returns the device node corresponding to the regulator if found, else
 135  * returns NULL.
 136  */
 137 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 138 {
 139         struct device_node *regnode = NULL;
 140         char prop_name[32]; /* 32 is max size of property name */
 141
 142         dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
 143
 144         snprintf(prop_name, 32, "%s-supply", supply);
 145         regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 146
 147         if (!regnode) {
 148                 dev_dbg(dev, "Looking up %s property in node %s failed",
 149                                 prop_name, dev->of_node->full_name);
 150                 return NULL;
 151         }
 152         return regnode;
 153 }
 154
 155 static int _regulator_can_change_status(struct regulator_dev *rdev)
 156 {
 157         if (!rdev->constraints)
 158                 return 0;
 159
 160         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
 161                 return 1;
 162         else
 163                 return 0;
 164 }
 165
 166 /* Platform voltage constraint check */
 167 static int regulator_check_voltage(struct regulator_dev *rdev,
 168                                    int *min_uV, int *max_uV)
 169 {
 170         BUG_ON(*min_uV > *max_uV);
 171
 172         if (!rdev->constraints) {
 173                 rdev_err(rdev, "no constraints\n");
 174                 return -ENODEV;
 175         }
 176         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 177                 rdev_err(rdev, "operation not allowed\n");
 178                 return -EPERM;
 179         }
 180
 181         if (*max_uV > rdev->constraints->max_uV)
 182                 *max_uV = rdev->constraints->max_uV;
 183         if (*min_uV < rdev->constraints->min_uV)
 184                 *min_uV = rdev->constraints->min_uV;
 185
 186         if (*min_uV > *max_uV) {
 187                 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
 188                          *min_uV, *max_uV);
 189                 return -EINVAL;
 190         }
 191
 192         return 0;
 193 }
 194
 195 /* Make sure we select a voltage that suits the needs of all
 196  * regulator consumers
 197  */
 198 static int regulator_check_consumers(struct regulator_dev *rdev,
 199                                      int *min_uV, int *max_uV)
 200 {
 201         struct regulator *regulator;
 202
 203         list_for_each_entry(regulator, &rdev->consumer_list, list) {
 204                 /*
 205                  * Assume consumers that didn't say anything are OK
 206                  * with anything in the constraint range.
 207                  */
 208                 if (!regulator->min_uV && !regulator->max_uV)
 209                         continue;
 210
 211                 if (*max_uV > regulator->max_uV)
 212                         *max_uV = regulator->max_uV;
 213                 if (*min_uV < regulator->min_uV)
 214                         *min_uV = regulator->min_uV;
 215         }
 216
 217         if (*min_uV > *max_uV) {
 218                 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
 219                         *min_uV, *max_uV);
 220                 return -EINVAL;
 221         }
 222
 223         return 0;
 224 }
 225
 226 /* current constraint check */
 227 static int regulator_check_current_limit(struct regulator_dev *rdev,
 228                                         int *min_uA, int *max_uA)
 229 {
 230         BUG_ON(*min_uA > *max_uA);
 231
 232         if (!rdev->constraints) {
 233                 rdev_err(rdev, "no constraints\n");
 234                 return -ENODEV;
 235         }
 236         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 237                 rdev_err(rdev, "operation not allowed\n");
 238                 return -EPERM;
 239         }
 240
 241         if (*max_uA > rdev->constraints->max_uA)
 242                 *max_uA = rdev->constraints->max_uA;
 243         if (*min_uA < rdev->constraints->min_uA)
 244                 *min_uA = rdev->constraints->min_uA;
 245
 246         if (*min_uA > *max_uA) {
 247                 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
 248                          *min_uA, *max_uA);
 249                 return -EINVAL;
 250         }
 251
 252         return 0;
 253 }
 254
 255 /* operating mode constraint check */
 256 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
 257 {
 258         switch (*mode) {
 259         case REGULATOR_MODE_FAST:
 260         case REGULATOR_MODE_NORMAL:
 261         case REGULATOR_MODE_IDLE:
 262         case REGULATOR_MODE_STANDBY:
 263                 break;
 264         default:
 265                 rdev_err(rdev, "invalid mode %x specified\n", *mode);
 266                 return -EINVAL;
 267         }
 268
 269         if (!rdev->constraints) {
 270                 rdev_err(rdev, "no constraints\n");
 271                 return -ENODEV;
 272         }
 273         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 274                 rdev_err(rdev, "operation not allowed\n");
 275                 return -EPERM;
 276         }
 277
 278         /* The modes are bitmasks, the most power hungry modes having
 279          * the lowest values. If the requested mode isn't supported
 280          * try higher modes. */
 281         while (*mode) {
 282                 if (rdev->constraints->valid_modes_mask & *mode)
 283                         return 0;
 284                 *mode /= 2;
 285         }
 286
 287         return -EINVAL;
 288 }
 289
 290 /* dynamic regulator mode switching constraint check */
 291 static int regulator_check_drms(struct regulator_dev *rdev)
 292 {
 293         if (!rdev->constraints) {
 294                 rdev_err(rdev, "no constraints\n");
 295                 return -ENODEV;
 296         }
 297         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 298                 rdev_err(rdev, "operation not allowed\n");
 299                 return -EPERM;
 300         }
 301         return 0;
 302 }
 303
 304 static ssize_t regulator_uV_show(struct device *dev,
 305                                 struct device_attribute *attr, char *buf)
 306 {
 307         struct regulator_dev *rdev = dev_get_drvdata(dev);
 308         ssize_t ret;
 309
 310         mutex_lock(&rdev->mutex);
 311         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 312         mutex_unlock(&rdev->mutex);
 313
 314         return ret;
 315 }
 316 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 317
 318 static ssize_t regulator_uA_show(struct device *dev,
 319                                 struct device_attribute *attr, char *buf)
 320 {
 321         struct regulator_dev *rdev = dev_get_drvdata(dev);
 322
 323         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 324 }
 325 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 326
 327 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 328                          char *buf)
 329 {
 330         struct regulator_dev *rdev = dev_get_drvdata(dev);
 331
 332         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 333 }
 334 static DEVICE_ATTR_RO(name);
 335
 336 static ssize_t regulator_print_opmode(char *buf, int mode)
 337 {
 338         switch (mode) {
 339         case REGULATOR_MODE_FAST:
 340                 return sprintf(buf, "fast\n");
 341         case REGULATOR_MODE_NORMAL:
 342                 return sprintf(buf, "normal\n");
 343         case REGULATOR_MODE_IDLE:
 344                 return sprintf(buf, "idle\n");
 345         case REGULATOR_MODE_STANDBY:
 346                 return sprintf(buf, "standby\n");
 347         }
 348         return sprintf(buf, "unknown\n");
 349 }
 350
 351 static ssize_t regulator_opmode_show(struct device *dev,
 352                                     struct device_attribute *attr, char *buf)
 353 {
 354         struct regulator_dev *rdev = dev_get_drvdata(dev);
 355
 356         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 357 }
 358 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 359
 360 static ssize_t regulator_print_state(char *buf, int state)
 361 {
 362         if (state > 0)
 363                 return sprintf(buf, "enabled\n");
 364         else if (state == 0)
 365                 return sprintf(buf, "disabled\n");
 366         else
 367                 return sprintf(buf, "unknown\n");
 368 }
 369
 370 static ssize_t regulator_state_show(struct device *dev,
 371                                    struct device_attribute *attr, char *buf)
 372 {
 373         struct regulator_dev *rdev = dev_get_drvdata(dev);
 374         ssize_t ret;
 375
 376         mutex_lock(&rdev->mutex);
 377         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 378         mutex_unlock(&rdev->mutex);
 379
 380         return ret;
 381 }
 382 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 383
 384 static ssize_t regulator_status_show(struct device *dev,
 385                                    struct device_attribute *attr, char *buf)
 386 {
 387         struct regulator_dev *rdev = dev_get_drvdata(dev);
 388         int status;
 389         char *label;
 390
 391         status = rdev->desc->ops->get_status(rdev);
 392         if (status < 0)
 393                 return status;
 394
 395         switch (status) {
 396         case REGULATOR_STATUS_OFF:
 397                 label = "off";
 398                 break;
 399         case REGULATOR_STATUS_ON:
 400                 label = "on";
 401                 break;
 402         case REGULATOR_STATUS_ERROR:
 403                 label = "error";
 404                 break;
 405         case REGULATOR_STATUS_FAST:
 406                 label = "fast";
 407                 break;
 408         case REGULATOR_STATUS_NORMAL:
 409                 label = "normal";
 410                 break;
 411         case REGULATOR_STATUS_IDLE:
 412                 label = "idle";
 413                 break;
 414         case REGULATOR_STATUS_STANDBY:
 415                 label = "standby";
 416                 break;
 417         case REGULATOR_STATUS_BYPASS:
 418                 label = "bypass";
 419                 break;
 420         case REGULATOR_STATUS_UNDEFINED:
 421                 label = "undefined";
 422                 break;
 423         default:
 424                 return -ERANGE;
 425         }
 426
 427         return sprintf(buf, "%s\n", label);
 428 }
 429 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 430
 431 static ssize_t regulator_min_uA_show(struct device *dev,
 432                                     struct device_attribute *attr, char *buf)
 433 {
 434         struct regulator_dev *rdev = dev_get_drvdata(dev);
 435
 436         if (!rdev->constraints)
 437                 return sprintf(buf, "constraint not defined\n");
 438
 439         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 440 }
 441 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 442
 443 static ssize_t regulator_max_uA_show(struct device *dev,
 444                                     struct device_attribute *attr, char *buf)
 445 {
 446         struct regulator_dev *rdev = dev_get_drvdata(dev);
 447
 448         if (!rdev->constraints)
 449                 return sprintf(buf, "constraint not defined\n");
 450
 451         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 452 }
 453 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 454
 455 static ssize_t regulator_min_uV_show(struct device *dev,
 456                                     struct device_attribute *attr, char *buf)
 457 {
 458         struct regulator_dev *rdev = dev_get_drvdata(dev);
 459
 460         if (!rdev->constraints)
 461                 return sprintf(buf, "constraint not defined\n");
 462
 463         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 464 }
 465 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 466
 467 static ssize_t regulator_max_uV_show(struct device *dev,
 468                                     struct device_attribute *attr, char *buf)
 469 {
 470         struct regulator_dev *rdev = dev_get_drvdata(dev);
 471
 472         if (!rdev->constraints)
 473                 return sprintf(buf, "constraint not defined\n");
 474
 475         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 476 }
 477 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 478
 479 static ssize_t regulator_total_uA_show(struct device *dev,
 480                                       struct device_attribute *attr, char *buf)
 481 {
 482         struct regulator_dev *rdev = dev_get_drvdata(dev);
 483         struct regulator *regulator;
 484         int uA = 0;
 485
 486         mutex_lock(&rdev->mutex);
 487         list_for_each_entry(regulator, &rdev->consumer_list, list)
 488                 uA += regulator->uA_load;
 489         mutex_unlock(&rdev->mutex);
 490         return sprintf(buf, "%d\n", uA);
 491 }
 492 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 493
 494 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
 495                               char *buf)
 496 {
 497         struct regulator_dev *rdev = dev_get_drvdata(dev);
 498         return sprintf(buf, "%d\n", rdev->use_count);
 499 }
 500 static DEVICE_ATTR_RO(num_users);
 501
 502 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 503                          char *buf)
 504 {
 505         struct regulator_dev *rdev = dev_get_drvdata(dev);
 506
 507         switch (rdev->desc->type) {
 508         case REGULATOR_VOLTAGE:
 509                 return sprintf(buf, "voltage\n");
 510         case REGULATOR_CURRENT:
 511                 return sprintf(buf, "current\n");
 512         }
 513         return sprintf(buf, "unknown\n");
 514 }
 515 static DEVICE_ATTR_RO(type);
 516
 517 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 518                                 struct device_attribute *attr, char *buf)
 519 {
 520         struct regulator_dev *rdev = dev_get_drvdata(dev);
 521
 522         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 523 }
 524 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 525                 regulator_suspend_mem_uV_show, NULL);
 526
 527 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 528                                 struct device_attribute *attr, char *buf)
 529 {
 530         struct regulator_dev *rdev = dev_get_drvdata(dev);
 531
 532         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 533 }
 534 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 535                 regulator_suspend_disk_uV_show, NULL);
 536
 537 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 538                                 struct device_attribute *attr, char *buf)
 539 {
 540         struct regulator_dev *rdev = dev_get_drvdata(dev);
 541
 542         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 543 }
 544 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 545                 regulator_suspend_standby_uV_show, NULL);
 546
 547 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 548                                 struct device_attribute *attr, char *buf)
 549 {
 550         struct regulator_dev *rdev = dev_get_drvdata(dev);
 551
 552         return regulator_print_opmode(buf,
 553                 rdev->constraints->state_mem.mode);
 554 }
 555 static DEVICE_ATTR(suspend_mem_mode, 0444,
 556                 regulator_suspend_mem_mode_show, NULL);
 557
 558 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 559                                 struct device_attribute *attr, char *buf)
 560 {
 561         struct regulator_dev *rdev = dev_get_drvdata(dev);
 562
 563         return regulator_print_opmode(buf,
 564                 rdev->constraints->state_disk.mode);
 565 }
 566 static DEVICE_ATTR(suspend_disk_mode, 0444,
 567                 regulator_suspend_disk_mode_show, NULL);
 568
 569 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 570                                 struct device_attribute *attr, char *buf)
 571 {
 572         struct regulator_dev *rdev = dev_get_drvdata(dev);
 573
 574         return regulator_print_opmode(buf,
 575                 rdev->constraints->state_standby.mode);
 576 }
 577 static DEVICE_ATTR(suspend_standby_mode, 0444,
 578                 regulator_suspend_standby_mode_show, NULL);
 579
 580 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 581                                    struct device_attribute *attr, char *buf)
 582 {
 583         struct regulator_dev *rdev = dev_get_drvdata(dev);
 584
 585         return regulator_print_state(buf,
 586                         rdev->constraints->state_mem.enabled);
 587 }
 588 static DEVICE_ATTR(suspend_mem_state, 0444,
 589                 regulator_suspend_mem_state_show, NULL);
 590
 591 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 592                                    struct device_attribute *attr, char *buf)
 593 {
 594         struct regulator_dev *rdev = dev_get_drvdata(dev);
 595
 596         return regulator_print_state(buf,
 597                         rdev->constraints->state_disk.enabled);
 598 }
 599 static DEVICE_ATTR(suspend_disk_state, 0444,
 600                 regulator_suspend_disk_state_show, NULL);
 601
 602 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 603                                    struct device_attribute *attr, char *buf)
 604 {
 605         struct regulator_dev *rdev = dev_get_drvdata(dev);
 606
 607         return regulator_print_state(buf,
 608                         rdev->constraints->state_standby.enabled);
 609 }
 610 static DEVICE_ATTR(suspend_standby_state, 0444,
 611                 regulator_suspend_standby_state_show, NULL);
 612
 613 static ssize_t regulator_bypass_show(struct device *dev,
 614                                      struct device_attribute *attr, char *buf)
 615 {
 616         struct regulator_dev *rdev = dev_get_drvdata(dev);
 617         const char *report;
 618         bool bypass;
 619         int ret;
 620
 621         ret = rdev->desc->ops->get_bypass(rdev, &bypass);
 622
 623         if (ret != 0)
 624                 report = "unknown";
 625         else if (bypass)
 626                 report = "enabled";
 627         else
 628                 report = "disabled";
 629
 630         return sprintf(buf, "%s\n", report);
 631 }
 632 static DEVICE_ATTR(bypass, 0444,
 633                    regulator_bypass_show, NULL);
 634
 635 /*
 636  * These are the only attributes are present for all regulators.
 637  * Other attributes are a function of regulator functionality.
 638  */
 639 static struct attribute *regulator_dev_attrs[] = {
 640         &dev_attr_name.attr,
 641         &dev_attr_num_users.attr,
 642         &dev_attr_type.attr,
 643         NULL,
 644 };
 645 ATTRIBUTE_GROUPS(regulator_dev);
 646
 647 static void regulator_dev_release(struct device *dev)
 648 {
 649         struct regulator_dev *rdev = dev_get_drvdata(dev);
 650         kfree(rdev);
 651 }
 652
 653 static struct class regulator_class = {
 654         .name = "regulator",
 655         .dev_release = regulator_dev_release,
 656         .dev_groups = regulator_dev_groups,
 657 };
 658
 659 /* Calculate the new optimum regulator operating mode based on the new total
 660  * consumer load. All locks held by caller */
 661 static void drms_uA_update(struct regulator_dev *rdev)
 662 {
 663         struct regulator *sibling;
 664         int current_uA = 0, output_uV, input_uV, err;
 665         unsigned int mode;
 666
 667         err = regulator_check_drms(rdev);
 668         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 669             (!rdev->desc->ops->get_voltage &&
 670              !rdev->desc->ops->get_voltage_sel) ||
 671             !rdev->desc->ops->set_mode)
 672                 return;
 673
 674         /* get output voltage */
 675         output_uV = _regulator_get_voltage(rdev);
 676         if (output_uV <= 0)
 677                 return;
 678
 679         /* get input voltage */
 680         input_uV = 0;
 681         if (rdev->supply)
 682                 input_uV = regulator_get_voltage(rdev->supply);
 683         if (input_uV <= 0)
 684                 input_uV = rdev->constraints->input_uV;
 685         if (input_uV <= 0)
 686                 return;
 687
 688         /* calc total requested load */
 689         list_for_each_entry(sibling, &rdev->consumer_list, list)
 690                 current_uA += sibling->uA_load;
 691
 692         /* now get the optimum mode for our new total regulator load */
 693         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 694                                                   output_uV, current_uA);
 695
 696         /* check the new mode is allowed */
 697         err = regulator_mode_constrain(rdev, &mode);
 698         if (err == 0)
 699                 rdev->desc->ops->set_mode(rdev, mode);
 700 }
 701
 702 static int suspend_set_state(struct regulator_dev *rdev,
 703         struct regulator_state *rstate)
 704 {
 705         int ret = 0;
 706
 707         /* If we have no suspend mode configration don't set anything;
 708          * only warn if the driver implements set_suspend_voltage or
 709          * set_suspend_mode callback.
 710          */
 711         if (!rstate->enabled && !rstate->disabled) {
 712                 if (rdev->desc->ops->set_suspend_voltage ||
 713                     rdev->desc->ops->set_suspend_mode)
 714                         rdev_warn(rdev, "No configuration\n");
 715                 return 0;
 716         }
 717
 718         if (rstate->enabled && rstate->disabled) {
 719                 rdev_err(rdev, "invalid configuration\n");
 720                 return -EINVAL;
 721         }
 722
 723         if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
 724                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 725         else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
 726                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 727         else /* OK if set_suspend_enable or set_suspend_disable is NULL */
 728                 ret = 0;
 729
 730         if (ret < 0) {
 731                 rdev_err(rdev, "failed to enabled/disable\n");
 732                 return ret;
 733         }
 734
 735         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 736                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 737                 if (ret < 0) {
 738                         rdev_err(rdev, "failed to set voltage\n");
 739                         return ret;
 740                 }
 741         }
 742
 743         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 744                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 745                 if (ret < 0) {
 746                         rdev_err(rdev, "failed to set mode\n");
 747                         return ret;
 748                 }
 749         }
 750         return ret;
 751 }
 752
 753 /* locks held by caller */
 754 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 755 {
 756         if (!rdev->constraints)
 757                 return -EINVAL;
 758
 759         switch (state) {
 760         case PM_SUSPEND_STANDBY:
 761                 return suspend_set_state(rdev,
 762                         &rdev->constraints->state_standby);
 763         case PM_SUSPEND_MEM:
 764                 return suspend_set_state(rdev,
 765                         &rdev->constraints->state_mem);
 766         case PM_SUSPEND_MAX:
 767                 return suspend_set_state(rdev,
 768                         &rdev->constraints->state_disk);
 769         default:
 770                 return -EINVAL;
 771         }
 772 }
 773
 774 static void print_constraints(struct regulator_dev *rdev)
 775 {
 776         struct regulation_constraints *constraints = rdev->constraints;
 777         char buf[80] = "";
 778         int count = 0;
 779         int ret;
 780
 781         if (constraints->min_uV && constraints->max_uV) {
 782                 if (constraints->min_uV == constraints->max_uV)
 783                         count += sprintf(buf + count, "%d mV ",
 784                                          constraints->min_uV / 1000);
 785                 else
 786                         count += sprintf(buf + count, "%d <--> %d mV ",
 787                                          constraints->min_uV / 1000,
 788                                          constraints->max_uV / 1000);
 789         }
 790
 791         if (!constraints->min_uV ||
 792             constraints->min_uV != constraints->max_uV) {
 793                 ret = _regulator_get_voltage(rdev);
 794                 if (ret > 0)
 795                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
 796         }
 797
 798         if (constraints->uV_offset)
 799                 count += sprintf(buf, "%dmV offset ",
 800                                  constraints->uV_offset / 1000);
 801
 802         if (constraints->min_uA && constraints->max_uA) {
 803                 if (constraints->min_uA == constraints->max_uA)
 804                         count += sprintf(buf + count, "%d mA ",
 805                                          constraints->min_uA / 1000);
 806                 else
 807                         count += sprintf(buf + count, "%d <--> %d mA ",
 808                                          constraints->min_uA / 1000,
 809                                          constraints->max_uA / 1000);
 810         }
 811
 812         if (!constraints->min_uA ||
 813             constraints->min_uA != constraints->max_uA) {
 814                 ret = _regulator_get_current_limit(rdev);
 815                 if (ret > 0)
 816                         count += sprintf(buf + count, "at %d mA ", ret / 1000);
 817         }
 818
 819         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 820                 count += sprintf(buf + count, "fast ");
 821         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 822                 count += sprintf(buf + count, "normal ");
 823         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 824                 count += sprintf(buf + count, "idle ");
 825         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 826                 count += sprintf(buf + count, "standby");
 827
 828         if (!count)
 829                 sprintf(buf, "no parameters");
 830
 831         rdev_dbg(rdev, "%s\n", buf);
 832
 833         if ((constraints->min_uV != constraints->max_uV) &&
 834             !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
 835                 rdev_warn(rdev,
 836                           "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
 837 }
 838
 839 static int machine_constraints_voltage(struct regulator_dev *rdev,
 840         struct regulation_constraints *constraints)
 841 {
 842         const struct regulator_ops *ops = rdev->desc->ops;
 843         int ret;
 844
 845         /* do we need to apply the constraint voltage */
 846         if (rdev->constraints->apply_uV &&
 847             rdev->constraints->min_uV == rdev->constraints->max_uV) {
 848                 int current_uV = _regulator_get_voltage(rdev);
 849                 if (current_uV < 0) {
 850                         rdev_err(rdev,
 851                                  "failed to get the current voltage(%d)\n",
 852                                  current_uV);
 853                         return current_uV;
 854                 }
 855                 if (current_uV < rdev->constraints->min_uV ||
 856                     current_uV > rdev->constraints->max_uV) {
 857                         ret = _regulator_do_set_voltage(
 858                                 rdev, rdev->constraints->min_uV,
 859                                 rdev->constraints->max_uV);
 860                         if (ret < 0) {
 861                                 rdev_err(rdev,
 862                                         "failed to apply %duV constraint(%d)\n",
 863                                         rdev->constraints->min_uV, ret);
 864                                 return ret;
 865                         }
 866                 }
 867         }
 868
 869         /* constrain machine-level voltage specs to fit
 870          * the actual range supported by this regulator.
 871          */
 872         if (ops->list_voltage && rdev->desc->n_voltages) {
 873                 int     count = rdev->desc->n_voltages;
 874                 int     i;
 875                 int     min_uV = INT_MAX;
 876                 int     max_uV = INT_MIN;
 877                 int     cmin = constraints->min_uV;
 878                 int     cmax = constraints->max_uV;
 879
 880                 /* it's safe to autoconfigure fixed-voltage supplies
 881                    and the constraints are used by list_voltage. */
 882                 if (count == 1 && !cmin) {
 883                         cmin = 1;
 884                         cmax = INT_MAX;
 885                         constraints->min_uV = cmin;
 886                         constraints->max_uV = cmax;
 887                 }
 888
 889                 /* voltage constraints are optional */
 890                 if ((cmin == 0) && (cmax == 0))
 891                         return 0;
 892
 893                 /* else require explicit machine-level constraints */
 894                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 895                         rdev_err(rdev, "invalid voltage constraints\n");
 896                         return -EINVAL;
 897                 }
 898
 899                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 900                 for (i = 0; i < count; i++) {
 901                         int     value;
 902
 903                         value = ops->list_voltage(rdev, i);
 904                         if (value <= 0)
 905                                 continue;
 906
 907                         /* maybe adjust [min_uV..max_uV] */
 908                         if (value >= cmin && value < min_uV)
 909                                 min_uV = value;
 910                         if (value <= cmax && value > max_uV)
 911                                 max_uV = value;
 912                 }
 913
 914                 /* final: [min_uV..max_uV] valid iff constraints valid */
 915                 if (max_uV < min_uV) {
 916                         rdev_err(rdev,
 917                                  "unsupportable voltage constraints %u-%uuV\n",
 918                                  min_uV, max_uV);
 919                         return -EINVAL;
 920                 }
 921
 922                 /* use regulator's subset of machine constraints */
 923                 if (constraints->min_uV < min_uV) {
 924                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
 925                                  constraints->min_uV, min_uV);
 926                         constraints->min_uV = min_uV;
 927                 }
 928                 if (constraints->max_uV > max_uV) {
 929                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
 930                                  constraints->max_uV, max_uV);
 931                         constraints->max_uV = max_uV;
 932                 }
 933         }
 934
 935         return 0;
 936 }
 937
 938 static int machine_constraints_current(struct regulator_dev *rdev,
 939         struct regulation_constraints *constraints)
 940 {
 941         const struct regulator_ops *ops = rdev->desc->ops;
 942         int ret;
 943
 944         if (!constraints->min_uA && !constraints->max_uA)
 945                 return 0;
 946
 947         if (constraints->min_uA > constraints->max_uA) {
 948                 rdev_err(rdev, "Invalid current constraints\n");
 949                 return -EINVAL;
 950         }
 951
 952         if (!ops->set_current_limit || !ops->get_current_limit) {
 953                 rdev_warn(rdev, "Operation of current configuration missing\n");
 954                 return 0;
 955         }
 956
 957         /* Set regulator current in constraints range */
 958         ret = ops->set_current_limit(rdev, constraints->min_uA,
 959                         constraints->max_uA);
 960         if (ret < 0) {
 961                 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
 962                 return ret;
 963         }
 964
 965         return 0;
 966 }
 967
 968 static int _regulator_do_enable(struct regulator_dev *rdev);
 969
 970 /**
 971  * set_machine_constraints - sets regulator constraints
 972  * @rdev: regulator source
 973  * @constraints: constraints to apply
 974  *
 975  * Allows platform initialisation code to define and constrain
 976  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 977  * Constraints *must* be set by platform code in order for some
 978  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 979  * set_mode.
 980  */
 981 static int set_machine_constraints(struct regulator_dev *rdev,
 982         const struct regulation_constraints *constraints)
 983 {
 984         int ret = 0;
 985         const struct regulator_ops *ops = rdev->desc->ops;
 986
 987         if (constraints)
 988                 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
 989                                             GFP_KERNEL);
 990         else
 991                 rdev->constraints = kzalloc(sizeof(*constraints),
 992                                             GFP_KERNEL);
 993         if (!rdev->constraints)
 994                 return -ENOMEM;
 995
 996         ret = machine_constraints_voltage(rdev, rdev->constraints);
 997         if (ret != 0)
 998                 goto out;
 999
1000         ret = machine_constraints_current(rdev, rdev->constraints);
1001         if (ret != 0)
1002                 goto out;
1003
1004         /* do we need to setup our suspend state */
1005         if (rdev->constraints->initial_state) {
1006                 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1007                 if (ret < 0) {
1008                         rdev_err(rdev, "failed to set suspend state\n");
1009                         goto out;
1010                 }
1011         }
1012
1013         if (rdev->constraints->initial_mode) {
1014                 if (!ops->set_mode) {
1015                         rdev_err(rdev, "no set_mode operation\n");
1016                         ret = -EINVAL;
1017                         goto out;
1018                 }
1019
1020                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1021                 if (ret < 0) {
1022                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1023                         goto out;
1024                 }
1025         }
1026
1027         /* If the constraints say the regulator should be on at this point
1028          * and we have control then make sure it is enabled.
1029          */
1030         if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1031                 ret = _regulator_do_enable(rdev);
1032                 if (ret < 0 && ret != -EINVAL) {
1033                         rdev_err(rdev, "failed to enable\n");
1034                         goto out;
1035                 }
1036         }
1037
1038         if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1039                 && ops->set_ramp_delay) {
1040                 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1041                 if (ret < 0) {
1042                         rdev_err(rdev, "failed to set ramp_delay\n");
1043                         goto out;
1044                 }
1045         }
1046
1047         print_constraints(rdev);
1048         return 0;
1049 out:
1050         kfree(rdev->constraints);
1051         rdev->constraints = NULL;
1052         return ret;
1053 }
1054
1055 /**
1056  * set_supply - set regulator supply regulator
1057  * @rdev: regulator name
1058  * @supply_rdev: supply regulator name
1059  *
1060  * Called by platform initialisation code to set the supply regulator for this
1061  * regulator. This ensures that a regulators supply will also be enabled by the
1062  * core if it's child is enabled.
1063  */
1064 static int set_supply(struct regulator_dev *rdev,
1065                       struct regulator_dev *supply_rdev)
1066 {
1067         int err;
1068
1069         rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1070
1071         rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1072         if (rdev->supply == NULL) {
1073                 err = -ENOMEM;
1074                 return err;
1075         }
1076         supply_rdev->open_count++;
1077
1078         return 0;
1079 }
1080
1081 /**
1082  * set_consumer_device_supply - Bind a regulator to a symbolic supply
1083  * @rdev:         regulator source
1084  * @consumer_dev_name: dev_name() string for device supply applies to
1085  * @supply:       symbolic name for supply
1086  *
1087  * Allows platform initialisation code to map physical regulator
1088  * sources to symbolic names for supplies for use by devices.  Devices
1089  * should use these symbolic names to request regulators, avoiding the
1090  * need to provide board-specific regulator names as platform data.
1091  */
1092 static int set_consumer_device_supply(struct regulator_dev *rdev,
1093                                       const char *consumer_dev_name,
1094                                       const char *supply)
1095 {
1096         struct regulator_map *node;
1097         int has_dev;
1098
1099         if (supply == NULL)
1100                 return -EINVAL;
1101
1102         if (consumer_dev_name != NULL)
1103                 has_dev = 1;
1104         else
1105                 has_dev = 0;
1106
1107         list_for_each_entry(node, &regulator_map_list, list) {
1108                 if (node->dev_name && consumer_dev_name) {
1109                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
1110                                 continue;
1111                 } else if (node->dev_name || consumer_dev_name) {
1112                         continue;
1113                 }
1114
1115                 if (strcmp(node->supply, supply) != 0)
1116                         continue;
1117
1118                 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1119                          consumer_dev_name,
1120                          dev_name(&node->regulator->dev),
1121                          node->regulator->desc->name,
1122                          supply,
1123                          dev_name(&rdev->dev), rdev_get_name(rdev));
1124                 return -EBUSY;
1125         }
1126
1127         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1128         if (node == NULL)
1129                 return -ENOMEM;
1130
1131         node->regulator = rdev;
1132         node->supply = supply;
1133
1134         if (has_dev) {
1135                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1136                 if (node->dev_name == NULL) {
1137                         kfree(node);
1138                         return -ENOMEM;
1139                 }
1140         }
1141
1142         list_add(&node->list, &regulator_map_list);
1143         return 0;
1144 }
1145
1146 static void unset_regulator_supplies(struct regulator_dev *rdev)
1147 {
1148         struct regulator_map *node, *n;
1149
1150         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1151                 if (rdev == node->regulator) {
1152                         list_del(&node->list);
1153                         kfree(node->dev_name);
1154                         kfree(node);
1155                 }
1156         }
1157 }
1158
1159 #define REG_STR_SIZE    64
1160
1161 static struct regulator *create_regulator(struct regulator_dev *rdev,
1162                                           struct device *dev,
1163                                           const char *supply_name)
1164 {
1165         struct regulator *regulator;
1166         char buf[REG_STR_SIZE];
1167         int err, size;
1168
1169         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1170         if (regulator == NULL)
1171                 return NULL;
1172
1173         mutex_lock(&rdev->mutex);
1174         regulator->rdev = rdev;
1175         list_add(&regulator->list, &rdev->consumer_list);
1176
1177         if (dev) {
1178                 regulator->dev = dev;
1179
1180                 /* Add a link to the device sysfs entry */
1181                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1182                                  dev->kobj.name, supply_name);
1183                 if (size >= REG_STR_SIZE)
1184                         goto overflow_err;
1185
1186                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1187                 if (regulator->supply_name == NULL)
1188                         goto overflow_err;
1189
1190                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1191                                         buf);
1192                 if (err) {
1193                         rdev_warn(rdev, "could not add device link %s err %d\n",
1194                                   dev->kobj.name, err);
1195                         /* non-fatal */
1196                 }
1197         } else {
1198                 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1199                 if (regulator->supply_name == NULL)
1200                         goto overflow_err;
1201         }
1202
1203         regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1204                                                 rdev->debugfs);
1205         if (!regulator->debugfs) {
1206                 rdev_warn(rdev, "Failed to create debugfs directory\n");
1207         } else {
1208                 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1209                                    &regulator->uA_load);
1210                 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1211                                    &regulator->min_uV);
1212                 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1213                                    &regulator->max_uV);
1214         }
1215
1216         /*
1217          * Check now if the regulator is an always on regulator - if
1218          * it is then we don't need to do nearly so much work for
1219          * enable/disable calls.
1220          */
1221         if (!_regulator_can_change_status(rdev) &&
1222             _regulator_is_enabled(rdev))
1223                 regulator->always_on = true;
1224
1225         mutex_unlock(&rdev->mutex);
1226         return regulator;
1227 overflow_err:
1228         list_del(&regulator->list);
1229         kfree(regulator);
1230         mutex_unlock(&rdev->mutex);
1231         return NULL;
1232 }
1233
1234 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1235 {
1236         if (rdev->constraints && rdev->constraints->enable_time)
1237                 return rdev->constraints->enable_time;
1238         if (!rdev->desc->ops->enable_time)
1239                 return rdev->desc->enable_time;
1240         return rdev->desc->ops->enable_time(rdev);
1241 }
1242
1243 static struct regulator_supply_alias *regulator_find_supply_alias(
1244                 struct device *dev, const char *supply)
1245 {
1246         struct regulator_supply_alias *map;
1247
1248         list_for_each_entry(map, &regulator_supply_alias_list, list)
1249                 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1250                         return map;
1251
1252         return NULL;
1253 }
1254
1255 static void regulator_supply_alias(struct device **dev, const char **supply)
1256 {
1257         struct regulator_supply_alias *map;
1258
1259         map = regulator_find_supply_alias(*dev, *supply);
1260         if (map) {
1261                 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1262                                 *supply, map->alias_supply,
1263                                 dev_name(map->alias_dev));
1264                 *dev = map->alias_dev;
1265                 *supply = map->alias_supply;
1266         }
1267 }
1268
1269 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1270                                                   const char *supply,
1271                                                   int *ret)
1272 {
1273         struct regulator_dev *r;
1274         struct device_node *node;
1275         struct regulator_map *map;
1276         const char *devname = NULL;
1277
1278         regulator_supply_alias(&dev, &supply);
1279
1280         /* first do a dt based lookup */
1281         if (dev && dev->of_node) {
1282                 node = of_get_regulator(dev, supply);
1283                 if (node) {
1284                         list_for_each_entry(r, &regulator_list, list)
1285                                 if (r->dev.parent &&
1286                                         node == r->dev.of_node)
1287                                         return r;
1288                         *ret = -EPROBE_DEFER;
1289                         return NULL;
1290                 } else {
1291                         /*
1292                          * If we couldn't even get the node then it's
1293                          * not just that the device didn't register
1294                          * yet, there's no node and we'll never
1295                          * succeed.
1296                          */
1297                         *ret = -ENODEV;
1298                 }
1299         }
1300
1301         /* if not found, try doing it non-dt way */
1302         if (dev)
1303                 devname = dev_name(dev);
1304
1305         list_for_each_entry(r, &regulator_list, list)
1306                 if (strcmp(rdev_get_name(r), supply) == 0)
1307                         return r;
1308
1309         list_for_each_entry(map, &regulator_map_list, list) {
1310                 /* If the mapping has a device set up it must match */
1311                 if (map->dev_name &&
1312                     (!devname || strcmp(map->dev_name, devname)))
1313                         continue;
1314
1315                 if (strcmp(map->supply, supply) == 0)
1316                         return map->regulator;
1317         }
1318
1319
1320         return NULL;
1321 }
1322
1323 /* Internal regulator request function */
1324 static struct regulator *_regulator_get(struct device *dev, const char *id,
1325                                         bool exclusive, bool allow_dummy)
1326 {
1327         struct regulator_dev *rdev;
1328         struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1329         const char *devname = NULL;
1330         int ret;
1331
1332         if (id == NULL) {
1333                 pr_err("get() with no identifier\n");
1334                 return ERR_PTR(-EINVAL);
1335         }
1336
1337         if (dev)
1338                 devname = dev_name(dev);
1339
1340         if (have_full_constraints())
1341                 ret = -ENODEV;
1342         else
1343                 ret = -EPROBE_DEFER;
1344
1345         mutex_lock(&regulator_list_mutex);
1346
1347         rdev = regulator_dev_lookup(dev, id, &ret);
1348         if (rdev)
1349                 goto found;
1350
1351         regulator = ERR_PTR(ret);
1352
1353         /*
1354          * If we have return value from dev_lookup fail, we do not expect to
1355          * succeed, so, quit with appropriate error value
1356          */
1357         if (ret && ret != -ENODEV)
1358                 goto out;
1359
1360         if (!devname)
1361                 devname = "deviceless";
1362
1363         /*
1364          * Assume that a regulator is physically present and enabled
1365          * even if it isn't hooked up and just provide a dummy.
1366          */
1367         if (have_full_constraints() && allow_dummy) {
1368                 pr_warn("%s supply %s not found, using dummy regulator\n",
1369                         devname, id);
1370
1371                 rdev = dummy_regulator_rdev;
1372                 goto found;
1373         /* Don't log an error when called from regulator_get_optional() */
1374         } else if (!have_full_constraints() || exclusive) {
1375                 dev_warn(dev, "dummy supplies not allowed\n");
1376         }
1377
1378         mutex_unlock(&regulator_list_mutex);
1379         return regulator;
1380
1381 found:
1382         if (rdev->exclusive) {
1383                 regulator = ERR_PTR(-EPERM);
1384                 goto out;
1385         }
1386
1387         if (exclusive && rdev->open_count) {
1388                 regulator = ERR_PTR(-EBUSY);
1389                 goto out;
1390         }
1391
1392         if (!try_module_get(rdev->owner))
1393                 goto out;
1394
1395         regulator = create_regulator(rdev, dev, id);
1396         if (regulator == NULL) {
1397                 regulator = ERR_PTR(-ENOMEM);
1398                 module_put(rdev->owner);
1399                 goto out;
1400         }
1401
1402         rdev->open_count++;
1403         if (exclusive) {
1404                 rdev->exclusive = 1;
1405
1406                 ret = _regulator_is_enabled(rdev);
1407                 if (ret > 0)
1408                         rdev->use_count = 1;
1409                 else
1410                         rdev->use_count = 0;
1411         }
1412
1413 out:
1414         mutex_unlock(&regulator_list_mutex);
1415
1416         return regulator;
1417 }
1418
1419 /**
1420  * regulator_get - lookup and obtain a reference 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.
1426  *
1427  * Use of supply names configured via regulator_set_device_supply() is
1428  * strongly encouraged.  It is recommended that the supply name used
1429  * should match the name used for the supply and/or the relevant
1430  * device pins in the datasheet.
1431  */
1432 struct regulator *regulator_get(struct device *dev, const char *id)
1433 {
1434         return _regulator_get(dev, id, false, true);
1435 }
1436 EXPORT_SYMBOL_GPL(regulator_get);
1437
1438 /**
1439  * regulator_get_exclusive - obtain exclusive access to a regulator.
1440  * @dev: device for regulator "consumer"
1441  * @id: Supply name or regulator ID.
1442  *
1443  * Returns a struct regulator corresponding to the regulator producer,
1444  * or IS_ERR() condition containing errno.  Other consumers will be
1445  * unable to obtain this regulator while this reference is held and the
1446  * use count for the regulator will be initialised to reflect the current
1447  * state of the regulator.
1448  *
1449  * This is intended for use by consumers which cannot tolerate shared
1450  * use of the regulator such as those which need to force the
1451  * regulator off for correct operation of the hardware they are
1452  * controlling.
1453  *
1454  * Use of supply names configured via regulator_set_device_supply() is
1455  * strongly encouraged.  It is recommended that the supply name used
1456  * should match the name used for the supply and/or the relevant
1457  * device pins in the datasheet.
1458  */
1459 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1460 {
1461         return _regulator_get(dev, id, true, false);
1462 }
1463 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1464
1465 /**
1466  * regulator_get_optional - obtain optional access to a regulator.
1467  * @dev: device for regulator "consumer"
1468  * @id: Supply name or regulator ID.
1469  *
1470  * Returns a struct regulator corresponding to the regulator producer,
1471  * or IS_ERR() condition containing errno.
1472  *
1473  * This is intended for use by consumers for devices which can have
1474  * some supplies unconnected in normal use, such as some MMC devices.
1475  * It can allow the regulator core to provide stub supplies for other
1476  * supplies requested using normal regulator_get() calls without
1477  * disrupting the operation of drivers that can handle absent
1478  * supplies.
1479  *
1480  * Use of supply names configured via regulator_set_device_supply() is
1481  * strongly encouraged.  It is recommended that the supply name used
1482  * should match the name used for the supply and/or the relevant
1483  * device pins in the datasheet.
1484  */
1485 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1486 {
1487         return _regulator_get(dev, id, false, false);
1488 }
1489 EXPORT_SYMBOL_GPL(regulator_get_optional);
1490
1491 /* Locks held by regulator_put() */
1492 static void _regulator_put(struct regulator *regulator)
1493 {
1494         struct regulator_dev *rdev;
1495
1496         if (regulator == NULL || IS_ERR(regulator))
1497                 return;
1498
1499         rdev = regulator->rdev;
1500
1501         debugfs_remove_recursive(regulator->debugfs);
1502
1503         /* remove any sysfs entries */
1504         if (regulator->dev)
1505                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1506         kfree(regulator->supply_name);
1507         list_del(&regulator->list);
1508         kfree(regulator);
1509
1510         rdev->open_count--;
1511         rdev->exclusive = 0;
1512
1513         module_put(rdev->owner);
1514 }
1515
1516 /**
1517  * regulator_put - "free" the regulator source
1518  * @regulator: regulator source
1519  *
1520  * Note: drivers must ensure that all regulator_enable calls made on this
1521  * regulator source are balanced by regulator_disable calls prior to calling
1522  * this function.
1523  */
1524 void regulator_put(struct regulator *regulator)
1525 {
1526         mutex_lock(&regulator_list_mutex);
1527         _regulator_put(regulator);
1528         mutex_unlock(&regulator_list_mutex);
1529 }
1530 EXPORT_SYMBOL_GPL(regulator_put);
1531
1532 /**
1533  * regulator_register_supply_alias - Provide device alias for supply lookup
1534  *
1535  * @dev: device that will be given as the regulator "consumer"
1536  * @id: Supply name or regulator ID
1537  * @alias_dev: device that should be used to lookup the supply
1538  * @alias_id: Supply name or regulator ID that should be used to lookup the
1539  * supply
1540  *
1541  * All lookups for id on dev will instead be conducted for alias_id on
1542  * alias_dev.
1543  */
1544 int regulator_register_supply_alias(struct device *dev, const char *id,
1545                                     struct device *alias_dev,
1546                                     const char *alias_id)
1547 {
1548         struct regulator_supply_alias *map;
1549
1550         map = regulator_find_supply_alias(dev, id);
1551         if (map)
1552                 return -EEXIST;
1553
1554         map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1555         if (!map)
1556                 return -ENOMEM;
1557
1558         map->src_dev = dev;
1559         map->src_supply = id;
1560         map->alias_dev = alias_dev;
1561         map->alias_supply = alias_id;
1562
1563         list_add(&map->list, &regulator_supply_alias_list);
1564
1565         pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1566                 id, dev_name(dev), alias_id, dev_name(alias_dev));
1567
1568         return 0;
1569 }
1570 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1571
1572 /**
1573  * regulator_unregister_supply_alias - Remove device alias
1574  *
1575  * @dev: device that will be given as the regulator "consumer"
1576  * @id: Supply name or regulator ID
1577  *
1578  * Remove a lookup alias if one exists for id on dev.
1579  */
1580 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1581 {
1582         struct regulator_supply_alias *map;
1583
1584         map = regulator_find_supply_alias(dev, id);
1585         if (map) {
1586                 list_del(&map->list);
1587                 kfree(map);
1588         }
1589 }
1590 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1591
1592 /**
1593  * regulator_bulk_register_supply_alias - register multiple aliases
1594  *
1595  * @dev: device that will be given as the regulator "consumer"
1596  * @id: List of supply names or regulator IDs
1597  * @alias_dev: device that should be used to lookup the supply
1598  * @alias_id: List of supply names or regulator IDs that should be used to
1599  * lookup the supply
1600  * @num_id: Number of aliases to register
1601  *
1602  * @return 0 on success, an errno on failure.
1603  *
1604  * This helper function allows drivers to register several supply
1605  * aliases in one operation.  If any of the aliases cannot be
1606  * registered any aliases that were registered will be removed
1607  * before returning to the caller.
1608  */
1609 int regulator_bulk_register_supply_alias(struct device *dev,
1610                                          const char *const *id,
1611                                          struct device *alias_dev,
1612                                          const char *const *alias_id,
1613                                          int num_id)
1614 {
1615         int i;
1616         int ret;
1617
1618         for (i = 0; i < num_id; ++i) {
1619                 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1620                                                       alias_id[i]);
1621                 if (ret < 0)
1622                         goto err;
1623         }
1624
1625         return 0;
1626
1627 err:
1628         dev_err(dev,
1629                 "Failed to create supply alias %s,%s -> %s,%s\n",
1630                 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1631
1632         while (--i >= 0)
1633                 regulator_unregister_supply_alias(dev, id[i]);
1634
1635         return ret;
1636 }
1637 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1638
1639 /**
1640  * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1641  *
1642  * @dev: device that will be given as the regulator "consumer"
1643  * @id: List of supply names or regulator IDs
1644  * @num_id: Number of aliases to unregister
1645  *
1646  * This helper function allows drivers to unregister several supply
1647  * aliases in one operation.
1648  */
1649 void regulator_bulk_unregister_supply_alias(struct device *dev,
1650                                             const char *const *id,
1651                                             int num_id)
1652 {
1653         int i;
1654
1655         for (i = 0; i < num_id; ++i)
1656                 regulator_unregister_supply_alias(dev, id[i]);
1657 }
1658 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1659
1660
1661 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1662 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1663                                 const struct regulator_config *config)
1664 {
1665         struct regulator_enable_gpio *pin;
1666         struct gpio_desc *gpiod;
1667         int ret;
1668
1669         gpiod = gpio_to_desc(config->ena_gpio);
1670
1671         list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
1672                 if (pin->gpiod == gpiod) {
1673                         rdev_dbg(rdev, "GPIO %d is already used\n",
1674                                 config->ena_gpio);
1675                         goto update_ena_gpio_to_rdev;
1676                 }
1677         }
1678
1679         ret = gpio_request_one(config->ena_gpio,
1680                                 GPIOF_DIR_OUT | config->ena_gpio_flags,
1681                                 rdev_get_name(rdev));
1682         if (ret)
1683                 return ret;
1684
1685         pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1686         if (pin == NULL) {
1687                 gpio_free(config->ena_gpio);
1688                 return -ENOMEM;
1689         }
1690
1691         pin->gpiod = gpiod;
1692         pin->ena_gpio_invert = config->ena_gpio_invert;
1693         list_add(&pin->list, &regulator_ena_gpio_list);
1694
1695 update_ena_gpio_to_rdev:
1696         pin->request_count++;
1697         rdev->ena_pin = pin;
1698         return 0;
1699 }
1700
1701 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1702 {
1703         struct regulator_enable_gpio *pin, *n;
1704
1705         if (!rdev->ena_pin)
1706                 return;
1707
1708         /* Free the GPIO only in case of no use */
1709         list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
1710                 if (pin->gpiod == rdev->ena_pin->gpiod) {
1711                         if (pin->request_count <= 1) {
1712                                 pin->request_count = 0;
1713                                 gpiod_put(pin->gpiod);
1714                                 list_del(&pin->list);
1715                                 kfree(pin);
1716                                 rdev->ena_pin = NULL;
1717                                 return;
1718                         } else {
1719                                 pin->request_count--;
1720                         }
1721                 }
1722         }
1723 }
1724
1725 /**
1726  * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1727  * @rdev: regulator_dev structure
1728  * @enable: enable GPIO at initial use?
1729  *
1730  * GPIO is enabled in case of initial use. (enable_count is 0)
1731  * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1732  */
1733 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1734 {
1735         struct regulator_enable_gpio *pin = rdev->ena_pin;
1736
1737         if (!pin)
1738                 return -EINVAL;
1739
1740         if (enable) {
1741                 /* Enable GPIO at initial use */
1742                 if (pin->enable_count == 0)
1743                         gpiod_set_value_cansleep(pin->gpiod,
1744                                                  !pin->ena_gpio_invert);
1745
1746                 pin->enable_count++;
1747         } else {
1748                 if (pin->enable_count > 1) {
1749                         pin->enable_count--;
1750                         return 0;
1751                 }
1752
1753                 /* Disable GPIO if not used */
1754                 if (pin->enable_count <= 1) {
1755                         gpiod_set_value_cansleep(pin->gpiod,
1756                                                  pin->ena_gpio_invert);
1757                         pin->enable_count = 0;
1758                 }
1759         }
1760
1761         return 0;
1762 }
1763
1764 /**
1765  * _regulator_enable_delay - a delay helper function
1766  * @delay: time to delay in microseconds
1767  *
1768  * Delay for the requested amount of time as per the guidelines in:
1769  *
1770  *     Documentation/timers/timers-howto.txt
1771  *
1772  * The assumption here is that regulators will never be enabled in
1773  * atomic context and therefore sleeping functions can be used.
1774  */
1775 static void _regulator_enable_delay(unsigned int delay)
1776 {
1777         unsigned int ms = delay / 1000;
1778         unsigned int us = delay % 1000;
1779
1780         if (ms > 0) {
1781                 /*
1782                  * For small enough values, handle super-millisecond
1783                  * delays in the usleep_range() call below.
1784                  */
1785                 if (ms < 20)
1786                         us += ms * 1000;
1787                 else
1788                         msleep(ms);
1789         }
1790
1791         /*
1792          * Give the scheduler some room to coalesce with any other
1793          * wakeup sources. For delays shorter than 10 us, don't even
1794          * bother setting up high-resolution timers and just busy-
1795          * loop.
1796          */
1797         if (us >= 10)
1798                 usleep_range(us, us + 100);
1799         else
1800                 udelay(us);
1801 }
1802
1803 static int _regulator_do_enable(struct regulator_dev *rdev)
1804 {
1805         int ret, delay;
1806
1807         /* Query before enabling in case configuration dependent.  */
1808         ret = _regulator_get_enable_time(rdev);
1809         if (ret >= 0) {
1810                 delay = ret;
1811         } else {
1812                 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1813                 delay = 0;
1814         }
1815
1816         trace_regulator_enable(rdev_get_name(rdev));
1817
1818         if (rdev->desc->off_on_delay) {
1819                 /* if needed, keep a distance of off_on_delay from last time
1820                  * this regulator was disabled.
1821                  */
1822                 unsigned long start_jiffy = jiffies;
1823                 unsigned long intended, max_delay, remaining;
1824
1825                 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
1826                 intended = rdev->last_off_jiffy + max_delay;
1827
1828                 if (time_before(start_jiffy, intended)) {
1829                         /* calc remaining jiffies to deal with one-time
1830                          * timer wrapping.
1831                          * in case of multiple timer wrapping, either it can be
1832                          * detected by out-of-range remaining, or it cannot be
1833                          * detected and we gets a panelty of
1834                          * _regulator_enable_delay().
1835                          */
1836                         remaining = intended - start_jiffy;
1837                         if (remaining <= max_delay)
1838                                 _regulator_enable_delay(
1839                                                 jiffies_to_usecs(remaining));
1840                 }
1841         }
1842
1843         if (rdev->ena_pin) {
1844                 ret = regulator_ena_gpio_ctrl(rdev, true);
1845                 if (ret < 0)
1846                         return ret;
1847                 rdev->ena_gpio_state = 1;
1848         } else if (rdev->desc->ops->enable) {
1849                 ret = rdev->desc->ops->enable(rdev);
1850                 if (ret < 0)
1851                         return ret;
1852         } else {
1853                 return -EINVAL;
1854         }
1855
1856         /* Allow the regulator to ramp; it would be useful to extend
1857          * this for bulk operations so that the regulators can ramp
1858          * together.  */
1859         trace_regulator_enable_delay(rdev_get_name(rdev));
1860
1861         _regulator_enable_delay(delay);
1862
1863         trace_regulator_enable_complete(rdev_get_name(rdev));
1864
1865         return 0;
1866 }
1867
1868 /* locks held by regulator_enable() */
1869 static int _regulator_enable(struct regulator_dev *rdev)
1870 {
1871         int ret;
1872
1873         /* check voltage and requested load before enabling */
1874         if (rdev->constraints &&
1875             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1876                 drms_uA_update(rdev);
1877
1878         if (rdev->use_count == 0) {
1879                 /* The regulator may on if it's not switchable or left on */
1880                 ret = _regulator_is_enabled(rdev);
1881                 if (ret == -EINVAL || ret == 0) {
1882                         if (!_regulator_can_change_status(rdev))
1883                                 return -EPERM;
1884
1885                         ret = _regulator_do_enable(rdev);
1886                         if (ret < 0)
1887                                 return ret;
1888
1889                 } else if (ret < 0) {
1890                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1891                         return ret;
1892                 }
1893                 /* Fallthrough on positive return values - already enabled */
1894         }
1895
1896         rdev->use_count++;
1897
1898         return 0;
1899 }
1900
1901 /**
1902  * regulator_enable - enable regulator output
1903  * @regulator: regulator source
1904  *
1905  * Request that the regulator be enabled with the regulator output at
1906  * the predefined voltage or current value.  Calls to regulator_enable()
1907  * must be balanced with calls to regulator_disable().
1908  *
1909  * NOTE: the output value can be set by other drivers, boot loader or may be
1910  * hardwired in the regulator.
1911  */
1912 int regulator_enable(struct regulator *regulator)
1913 {
1914         struct regulator_dev *rdev = regulator->rdev;
1915         int ret = 0;
1916
1917         if (regulator->always_on)
1918                 return 0;
1919
1920         if (rdev->supply) {
1921                 ret = regulator_enable(rdev->supply);
1922                 if (ret != 0)
1923                         return ret;
1924         }
1925
1926         mutex_lock(&rdev->mutex);
1927         ret = _regulator_enable(rdev);
1928         mutex_unlock(&rdev->mutex);
1929
1930         if (ret != 0 && rdev->supply)
1931                 regulator_disable(rdev->supply);
1932
1933         return ret;
1934 }
1935 EXPORT_SYMBOL_GPL(regulator_enable);
1936
1937 static int _regulator_do_disable(struct regulator_dev *rdev)
1938 {
1939         int ret;
1940
1941         trace_regulator_disable(rdev_get_name(rdev));
1942
1943         if (rdev->ena_pin) {
1944                 ret = regulator_ena_gpio_ctrl(rdev, false);
1945                 if (ret < 0)
1946                         return ret;
1947                 rdev->ena_gpio_state = 0;
1948
1949         } else if (rdev->desc->ops->disable) {
1950                 ret = rdev->desc->ops->disable(rdev);
1951                 if (ret != 0)
1952                         return ret;
1953         }
1954
1955         /* cares about last_off_jiffy only if off_on_delay is required by
1956          * device.
1957          */
1958         if (rdev->desc->off_on_delay)
1959                 rdev->last_off_jiffy = jiffies;
1960
1961         trace_regulator_disable_complete(rdev_get_name(rdev));
1962
1963         return 0;
1964 }
1965
1966 /* locks held by regulator_disable() */
1967 static int _regulator_disable(struct regulator_dev *rdev)
1968 {
1969         int ret = 0;
1970
1971         if (WARN(rdev->use_count <= 0,
1972                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
1973                 return -EIO;
1974
1975         /* are we the last user and permitted to disable ? */
1976         if (rdev->use_count == 1 &&
1977             (rdev->constraints && !rdev->constraints->always_on)) {
1978
1979                 /* we are last user */
1980                 if (_regulator_can_change_status(rdev)) {
1981                         ret = _notifier_call_chain(rdev,
1982                                                    REGULATOR_EVENT_PRE_DISABLE,
1983                                                    NULL);
1984                         if (ret & NOTIFY_STOP_MASK)
1985                                 return -EINVAL;
1986
1987                         ret = _regulator_do_disable(rdev);
1988                         if (ret < 0) {
1989                                 rdev_err(rdev, "failed to disable\n");
1990                                 _notifier_call_chain(rdev,
1991                                                 REGULATOR_EVENT_ABORT_DISABLE,
1992                                                 NULL);
1993                                 return ret;
1994                         }
1995                         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1996                                         NULL);
1997                 }
1998
1999                 rdev->use_count = 0;
2000         } else if (rdev->use_count > 1) {
2001
2002                 if (rdev->constraints &&
2003                         (rdev->constraints->valid_ops_mask &
2004                         REGULATOR_CHANGE_DRMS))
2005                         drms_uA_update(rdev);
2006
2007                 rdev->use_count--;
2008         }
2009
2010         return ret;
2011 }
2012
2013 /**
2014  * regulator_disable - disable regulator output
2015  * @regulator: regulator source
2016  *
2017  * Disable the regulator output voltage or current.  Calls to
2018  * regulator_enable() must be balanced with calls to
2019  * regulator_disable().
2020  *
2021  * NOTE: this will only disable the regulator output if no other consumer
2022  * devices have it enabled, the regulator device supports disabling and
2023  * machine constraints permit this operation.
2024  */
2025 int regulator_disable(struct regulator *regulator)
2026 {
2027         struct regulator_dev *rdev = regulator->rdev;
2028         int ret = 0;
2029
2030         if (regulator->always_on)
2031                 return 0;
2032
2033         mutex_lock(&rdev->mutex);
2034         ret = _regulator_disable(rdev);
2035         mutex_unlock(&rdev->mutex);
2036
2037         if (ret == 0 && rdev->supply)
2038                 regulator_disable(rdev->supply);
2039
2040         return ret;
2041 }
2042 EXPORT_SYMBOL_GPL(regulator_disable);
2043
2044 /* locks held by regulator_force_disable() */
2045 static int _regulator_force_disable(struct regulator_dev *rdev)
2046 {
2047         int ret = 0;
2048
2049         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2050                         REGULATOR_EVENT_PRE_DISABLE, NULL);
2051         if (ret & NOTIFY_STOP_MASK)
2052                 return -EINVAL;
2053
2054         ret = _regulator_do_disable(rdev);
2055         if (ret < 0) {
2056                 rdev_err(rdev, "failed to force disable\n");
2057                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2058                                 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2059                 return ret;
2060         }
2061
2062         _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2063                         REGULATOR_EVENT_DISABLE, NULL);
2064
2065         return 0;
2066 }
2067
2068 /**
2069  * regulator_force_disable - force disable regulator output
2070  * @regulator: regulator source
2071  *
2072  * Forcibly disable the regulator output voltage or current.
2073  * NOTE: this *will* disable the regulator output even if other consumer
2074  * devices have it enabled. This should be used for situations when device
2075  * damage will likely occur if the regulator is not disabled (e.g. over temp).
2076  */
2077 int regulator_force_disable(struct regulator *regulator)
2078 {
2079         struct regulator_dev *rdev = regulator->rdev;
2080         int ret;
2081
2082         mutex_lock(&rdev->mutex);
2083         regulator->uA_load = 0;
2084         ret = _regulator_force_disable(regulator->rdev);
2085         mutex_unlock(&rdev->mutex);
2086
2087         if (rdev->supply)
2088                 while (rdev->open_count--)
2089                         regulator_disable(rdev->supply);
2090
2091         return ret;
2092 }
2093 EXPORT_SYMBOL_GPL(regulator_force_disable);
2094
2095 static void regulator_disable_work(struct work_struct *work)
2096 {
2097         struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2098                                                   disable_work.work);
2099         int count, i, ret;
2100
2101         mutex_lock(&rdev->mutex);
2102
2103         BUG_ON(!rdev->deferred_disables);
2104
2105         count = rdev->deferred_disables;
2106         rdev->deferred_disables = 0;
2107
2108         for (i = 0; i < count; i++) {
2109                 ret = _regulator_disable(rdev);
2110                 if (ret != 0)
2111                         rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2112         }
2113
2114         mutex_unlock(&rdev->mutex);
2115
2116         if (rdev->supply) {
2117                 for (i = 0; i < count; i++) {
2118                         ret = regulator_disable(rdev->supply);
2119                         if (ret != 0) {
2120                                 rdev_err(rdev,
2121                                          "Supply disable failed: %d\n", ret);
2122                         }
2123                 }
2124         }
2125 }
2126
2127 /**
2128  * regulator_disable_deferred - disable regulator output with delay
2129  * @regulator: regulator source
2130  * @ms: miliseconds until the regulator is disabled
2131  *
2132  * Execute regulator_disable() on the regulator after a delay.  This
2133  * is intended for use with devices that require some time to quiesce.
2134  *
2135  * NOTE: this will only disable the regulator output if no other consumer
2136  * devices have it enabled, the regulator device supports disabling and
2137  * machine constraints permit this operation.
2138  */
2139 int regulator_disable_deferred(struct regulator *regulator, int ms)
2140 {
2141         struct regulator_dev *rdev = regulator->rdev;
2142         int ret;
2143
2144         if (regulator->always_on)
2145                 return 0;
2146
2147         if (!ms)
2148                 return regulator_disable(regulator);
2149
2150         mutex_lock(&rdev->mutex);
2151         rdev->deferred_disables++;
2152         mutex_unlock(&rdev->mutex);
2153
2154         ret = queue_delayed_work(system_power_efficient_wq,
2155                                  &rdev->disable_work,
2156                                  msecs_to_jiffies(ms));
2157         if (ret < 0)
2158                 return ret;
2159         else
2160                 return 0;
2161 }
2162 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2163
2164 static int _regulator_is_enabled(struct regulator_dev *rdev)
2165 {
2166         /* A GPIO control always takes precedence */
2167         if (rdev->ena_pin)
2168                 return rdev->ena_gpio_state;
2169
2170         /* If we don't know then assume that the regulator is always on */
2171         if (!rdev->desc->ops->is_enabled)
2172                 return 1;
2173
2174         return rdev->desc->ops->is_enabled(rdev);
2175 }
2176
2177 /**
2178  * regulator_is_enabled - is the regulator output enabled
2179  * @regulator: regulator source
2180  *
2181  * Returns positive if the regulator driver backing the source/client
2182  * has requested that the device be enabled, zero if it hasn't, else a
2183  * negative errno code.
2184  *
2185  * Note that the device backing this regulator handle can have multiple
2186  * users, so it might be enabled even if regulator_enable() was never
2187  * called for this particular source.
2188  */
2189 int regulator_is_enabled(struct regulator *regulator)
2190 {
2191         int ret;
2192
2193         if (regulator->always_on)
2194                 return 1;
2195
2196         mutex_lock(&regulator->rdev->mutex);
2197         ret = _regulator_is_enabled(regulator->rdev);
2198         mutex_unlock(&regulator->rdev->mutex);
2199
2200         return ret;
2201 }
2202 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2203
2204 /**
2205  * regulator_can_change_voltage - check if regulator can change voltage
2206  * @regulator: regulator source
2207  *
2208  * Returns positive if the regulator driver backing the source/client
2209  * can change its voltage, false otherwise. Useful for detecting fixed
2210  * or dummy regulators and disabling voltage change logic in the client
2211  * driver.
2212  */
2213 int regulator_can_change_voltage(struct regulator *regulator)
2214 {
2215         struct regulator_dev    *rdev = regulator->rdev;
2216
2217         if (rdev->constraints &&
2218             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2219                 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2220                         return 1;
2221
2222                 if (rdev->desc->continuous_voltage_range &&
2223                     rdev->constraints->min_uV && rdev->constraints->max_uV &&
2224                     rdev->constraints->min_uV != rdev->constraints->max_uV)
2225                         return 1;
2226         }
2227
2228         return 0;
2229 }
2230 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2231
2232 /**
2233  * regulator_count_voltages - count regulator_list_voltage() selectors
2234  * @regulator: regulator source
2235  *
2236  * Returns number of selectors, or negative errno.  Selectors are
2237  * numbered starting at zero, and typically correspond to bitfields
2238  * in hardware registers.
2239  */
2240 int regulator_count_voltages(struct regulator *regulator)
2241 {
2242         struct regulator_dev    *rdev = regulator->rdev;
2243
2244         if (rdev->desc->n_voltages)
2245                 return rdev->desc->n_voltages;
2246
2247         if (!rdev->supply)
2248                 return -EINVAL;
2249
2250         return regulator_count_voltages(rdev->supply);
2251 }
2252 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2253
2254 /**
2255  * regulator_list_voltage - enumerate supported voltages
2256  * @regulator: regulator source
2257  * @selector: identify voltage to list
2258  * Context: can sleep
2259  *
2260  * Returns a voltage that can be passed to @regulator_set_voltage(),
2261  * zero if this selector code can't be used on this system, or a
2262  * negative errno.
2263  */
2264 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2265 {
2266         struct regulator_dev *rdev = regulator->rdev;
2267         const struct regulator_ops *ops = rdev->desc->ops;
2268         int ret;
2269
2270         if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2271                 return rdev->desc->fixed_uV;
2272
2273         if (ops->list_voltage) {
2274                 if (selector >= rdev->desc->n_voltages)
2275                         return -EINVAL;
2276                 mutex_lock(&rdev->mutex);
2277                 ret = ops->list_voltage(rdev, selector);
2278                 mutex_unlock(&rdev->mutex);
2279         } else if (rdev->supply) {
2280                 ret = regulator_list_voltage(rdev->supply, selector);
2281         } else {
2282                 return -EINVAL;
2283         }
2284
2285         if (ret > 0) {
2286                 if (ret < rdev->constraints->min_uV)
2287                         ret = 0;
2288                 else if (ret > rdev->constraints->max_uV)
2289                         ret = 0;
2290         }
2291
2292         return ret;
2293 }
2294 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2295
2296 /**
2297  * regulator_get_regmap - get the regulator's register map
2298  * @regulator: regulator source
2299  *
2300  * Returns the register map for the given regulator, or an ERR_PTR value
2301  * if the regulator doesn't use regmap.
2302  */
2303 struct regmap *regulator_get_regmap(struct regulator *regulator)
2304 {
2305         struct regmap *map = regulator->rdev->regmap;
2306
2307         return map ? map : ERR_PTR(-EOPNOTSUPP);
2308 }
2309
2310 /**
2311  * regulator_get_hardware_vsel_register - get the HW voltage selector register
2312  * @regulator: regulator source
2313  * @vsel_reg: voltage selector register, output parameter
2314  * @vsel_mask: mask for voltage selector bitfield, output parameter
2315  *
2316  * Returns the hardware register offset and bitmask used for setting the
2317  * regulator voltage. This might be useful when configuring voltage-scaling
2318  * hardware or firmware that can make I2C requests behind the kernel's back,
2319  * for example.
2320  *
2321  * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2322  * and 0 is returned, otherwise a negative errno is returned.
2323  */
2324 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2325                                          unsigned *vsel_reg,
2326                                          unsigned *vsel_mask)
2327 {
2328         struct regulator_dev *rdev = regulator->rdev;
2329         const struct regulator_ops *ops = rdev->desc->ops;
2330
2331         if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2332                 return -EOPNOTSUPP;
2333
2334          *vsel_reg = rdev->desc->vsel_reg;
2335          *vsel_mask = rdev->desc->vsel_mask;
2336
2337          return 0;
2338 }
2339 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2340
2341 /**
2342  * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2343  * @regulator: regulator source
2344  * @selector: identify voltage to list
2345  *
2346  * Converts the selector to a hardware-specific voltage selector that can be
2347  * directly written to the regulator registers. The address of the voltage
2348  * register can be determined by calling @regulator_get_hardware_vsel_register.
2349  *
2350  * On error a negative errno is returned.
2351  */
2352 int regulator_list_hardware_vsel(struct regulator *regulator,
2353                                  unsigned selector)
2354 {
2355         struct regulator_dev *rdev = regulator->rdev;
2356         const struct regulator_ops *ops = rdev->desc->ops;
2357
2358         if (selector >= rdev->desc->n_voltages)
2359                 return -EINVAL;
2360         if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2361                 return -EOPNOTSUPP;
2362
2363         return selector;
2364 }
2365 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2366
2367 /**
2368  * regulator_get_linear_step - return the voltage step size between VSEL values
2369  * @regulator: regulator source
2370  *
2371  * Returns the voltage step size between VSEL values for linear
2372  * regulators, or return 0 if the regulator isn't a linear regulator.
2373  */
2374 unsigned int regulator_get_linear_step(struct regulator *regulator)
2375 {
2376         struct regulator_dev *rdev = regulator->rdev;
2377
2378         return rdev->desc->uV_step;
2379 }
2380 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2381
2382 /**
2383  * regulator_is_supported_voltage - check if a voltage range can be supported
2384  *
2385  * @regulator: Regulator to check.
2386  * @min_uV: Minimum required voltage in uV.
2387  * @max_uV: Maximum required voltage in uV.
2388  *
2389  * Returns a boolean or a negative error code.
2390  */
2391 int regulator_is_supported_voltage(struct regulator *regulator,
2392                                    int min_uV, int max_uV)
2393 {
2394         struct regulator_dev *rdev = regulator->rdev;
2395         int i, voltages, ret;
2396
2397         /* If we can't change voltage check the current voltage */
2398         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2399                 ret = regulator_get_voltage(regulator);
2400                 if (ret >= 0)
2401                         return min_uV <= ret && ret <= max_uV;
2402                 else
2403                         return ret;
2404         }
2405
2406         /* Any voltage within constrains range is fine? */
2407         if (rdev->desc->continuous_voltage_range)
2408                 return min_uV >= rdev->constraints->min_uV &&
2409                                 max_uV <= rdev->constraints->max_uV;
2410
2411         ret = regulator_count_voltages(regulator);
2412         if (ret < 0)
2413                 return ret;
2414         voltages = ret;
2415
2416         for (i = 0; i < voltages; i++) {
2417                 ret = regulator_list_voltage(regulator, i);
2418
2419                 if (ret >= min_uV && ret <= max_uV)
2420                         return 1;
2421         }
2422
2423         return 0;
2424 }
2425 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2426
2427 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2428                                        int min_uV, int max_uV,
2429                                        unsigned *selector)
2430 {
2431         struct pre_voltage_change_data data;
2432         int ret;
2433
2434         data.old_uV = _regulator_get_voltage(rdev);
2435         data.min_uV = min_uV;
2436         data.max_uV = max_uV;
2437         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2438                                    &data);
2439         if (ret & NOTIFY_STOP_MASK)
2440                 return -EINVAL;
2441
2442         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2443         if (ret >= 0)
2444                 return ret;
2445
2446         _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2447                              (void *)data.old_uV);
2448
2449         return ret;
2450 }
2451
2452 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2453                                            int uV, unsigned selector)
2454 {
2455         struct pre_voltage_change_data data;
2456         int ret;
2457
2458         data.old_uV = _regulator_get_voltage(rdev);
2459         data.min_uV = uV;
2460         data.max_uV = uV;
2461         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2462                                    &data);
2463         if (ret & NOTIFY_STOP_MASK)
2464                 return -EINVAL;
2465
2466         ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2467         if (ret >= 0)
2468                 return ret;
2469
2470         _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2471                              (void *)data.old_uV);
2472
2473         return ret;
2474 }
2475
2476 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2477                                      int min_uV, int max_uV)
2478 {
2479         int ret;
2480         int delay = 0;
2481         int best_val = 0;
2482         unsigned int selector;
2483         int old_selector = -1;
2484
2485         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2486
2487         min_uV += rdev->constraints->uV_offset;
2488         max_uV += rdev->constraints->uV_offset;
2489
2490         /*
2491          * If we can't obtain the old selector there is not enough
2492          * info to call set_voltage_time_sel().
2493          */
2494         if (_regulator_is_enabled(rdev) &&
2495             rdev->desc->ops->set_voltage_time_sel &&
2496             rdev->desc->ops->get_voltage_sel) {
2497                 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2498                 if (old_selector < 0)
2499                         return old_selector;
2500         }
2501
2502         if (rdev->desc->ops->set_voltage) {
2503                 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2504                                                   &selector);
2505
2506                 if (ret >= 0) {
2507                         if (rdev->desc->ops->list_voltage)
2508                                 best_val = rdev->desc->ops->list_voltage(rdev,
2509                                                                          selector);
2510                         else
2511                                 best_val = _regulator_get_voltage(rdev);
2512                 }
2513
2514         } else if (rdev->desc->ops->set_voltage_sel) {
2515                 if (rdev->desc->ops->map_voltage) {
2516                         ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2517                                                            max_uV);
2518                 } else {
2519                         if (rdev->desc->ops->list_voltage ==
2520                             regulator_list_voltage_linear)
2521                                 ret = regulator_map_voltage_linear(rdev,
2522                                                                 min_uV, max_uV);
2523                         else if (rdev->desc->ops->list_voltage ==
2524                                  regulator_list_voltage_linear_range)
2525                                 ret = regulator_map_voltage_linear_range(rdev,
2526                                                                 min_uV, max_uV);
2527                         else
2528                                 ret = regulator_map_voltage_iterate(rdev,
2529                                                                 min_uV, max_uV);
2530                 }
2531
2532                 if (ret >= 0) {
2533                         best_val = rdev->desc->ops->list_voltage(rdev, ret);
2534                         if (min_uV <= best_val && max_uV >= best_val) {
2535                                 selector = ret;
2536                                 if (old_selector == selector)
2537                                         ret = 0;
2538                                 else
2539                                         ret = _regulator_call_set_voltage_sel(
2540                                                 rdev, best_val, selector);
2541                         } else {
2542                                 ret = -EINVAL;
2543                         }
2544                 }
2545         } else {
2546                 ret = -EINVAL;
2547         }
2548
2549         /* Call set_voltage_time_sel if successfully obtained old_selector */
2550         if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2551                 && old_selector != selector) {
2552
2553                 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2554                                                 old_selector, selector);
2555                 if (delay < 0) {
2556                         rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2557                                   delay);
2558                         delay = 0;
2559                 }
2560
2561                 /* Insert any necessary delays */
2562                 if (delay >= 1000) {
2563                         mdelay(delay / 1000);
2564                         udelay(delay % 1000);
2565                 } else if (delay) {
2566                         udelay(delay);
2567                 }
2568         }
2569
2570         if (ret == 0 && best_val >= 0) {
2571                 unsigned long data = best_val;
2572
2573                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2574                                      (void *)data);
2575         }
2576
2577         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2578
2579         return ret;
2580 }
2581
2582 /**
2583  * regulator_set_voltage - set regulator output voltage
2584  * @regulator: regulator source
2585  * @min_uV: Minimum required voltage in uV
2586  * @max_uV: Maximum acceptable voltage in uV
2587  *
2588  * Sets a voltage regulator to the desired output voltage. This can be set
2589  * during any regulator state. IOW, regulator can be disabled or enabled.
2590  *
2591  * If the regulator is enabled then the voltage will change to the new value
2592  * immediately otherwise if the regulator is disabled the regulator will
2593  * output at the new voltage when enabled.
2594  *
2595  * NOTE: If the regulator is shared between several devices then the lowest
2596  * request voltage that meets the system constraints will be used.
2597  * Regulator system constraints must be set for this regulator before
2598  * calling this function otherwise this call will fail.
2599  */
2600 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2601 {
2602         struct regulator_dev *rdev = regulator->rdev;
2603         int ret = 0;
2604         int old_min_uV, old_max_uV;
2605         int current_uV;
2606
2607         mutex_lock(&rdev->mutex);
2608
2609         /* If we're setting the same range as last time the change
2610          * should be a noop (some cpufreq implementations use the same
2611          * voltage for multiple frequencies, for example).
2612          */
2613         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2614                 goto out;
2615
2616         /* If we're trying to set a range that overlaps the current voltage,
2617          * return succesfully even though the regulator does not support
2618          * changing the voltage.
2619          */
2620         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2621                 current_uV = _regulator_get_voltage(rdev);
2622                 if (min_uV <= current_uV && current_uV <= max_uV) {
2623                         regulator->min_uV = min_uV;
2624                         regulator->max_uV = max_uV;
2625                         goto out;
2626                 }
2627         }
2628
2629         /* sanity check */
2630         if (!rdev->desc->ops->set_voltage &&
2631             !rdev->desc->ops->set_voltage_sel) {
2632                 ret = -EINVAL;
2633                 goto out;
2634         }
2635
2636         /* constraints check */
2637         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2638         if (ret < 0)
2639                 goto out;
2640
2641         /* restore original values in case of error */
2642         old_min_uV = regulator->min_uV;
2643         old_max_uV = regulator->max_uV;
2644         regulator->min_uV = min_uV;
2645         regulator->max_uV = max_uV;
2646
2647         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2648         if (ret < 0)
2649                 goto out2;
2650
2651         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2652         if (ret < 0)
2653                 goto out2;
2654
2655 out:
2656         mutex_unlock(&rdev->mutex);
2657         return ret;
2658 out2:
2659         regulator->min_uV = old_min_uV;
2660         regulator->max_uV = old_max_uV;
2661         mutex_unlock(&rdev->mutex);
2662         return ret;
2663 }
2664 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2665
2666 /**
2667  * regulator_set_voltage_time - get raise/fall time
2668  * @regulator: regulator source
2669  * @old_uV: starting voltage in microvolts
2670  * @new_uV: target voltage in microvolts
2671  *
2672  * Provided with the starting and ending voltage, this function attempts to
2673  * calculate the time in microseconds required to rise or fall to this new
2674  * voltage.
2675  */
2676 int regulator_set_voltage_time(struct regulator *regulator,
2677                                int old_uV, int new_uV)
2678 {
2679         struct regulator_dev *rdev = regulator->rdev;
2680         const struct regulator_ops *ops = rdev->desc->ops;
2681         int old_sel = -1;
2682         int new_sel = -1;
2683         int voltage;
2684         int i;
2685
2686         /* Currently requires operations to do this */
2687         if (!ops->list_voltage || !ops->set_voltage_time_sel
2688             || !rdev->desc->n_voltages)
2689                 return -EINVAL;
2690
2691         for (i = 0; i < rdev->desc->n_voltages; i++) {
2692                 /* We only look for exact voltage matches here */
2693                 voltage = regulator_list_voltage(regulator, i);
2694                 if (voltage < 0)
2695                         return -EINVAL;
2696                 if (voltage == 0)
2697                         continue;
2698                 if (voltage == old_uV)
2699                         old_sel = i;
2700                 if (voltage == new_uV)
2701                         new_sel = i;
2702         }
2703
2704         if (old_sel < 0 || new_sel < 0)
2705                 return -EINVAL;
2706
2707         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2708 }
2709 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2710
2711 /**
2712  * regulator_set_voltage_time_sel - get raise/fall time
2713  * @rdev: regulator source device
2714  * @old_selector: selector for starting voltage
2715  * @new_selector: selector for target voltage
2716  *
2717  * Provided with the starting and target voltage selectors, this function
2718  * returns time in microseconds required to rise or fall to this new voltage
2719  *
2720  * Drivers providing ramp_delay in regulation_constraints can use this as their
2721  * set_voltage_time_sel() operation.
2722  */
2723 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2724                                    unsigned int old_selector,
2725                                    unsigned int new_selector)
2726 {
2727         unsigned int ramp_delay = 0;
2728         int old_volt, new_volt;
2729
2730         if (rdev->constraints->ramp_delay)
2731                 ramp_delay = rdev->constraints->ramp_delay;
2732         else if (rdev->desc->ramp_delay)
2733                 ramp_delay = rdev->desc->ramp_delay;
2734
2735         if (ramp_delay == 0) {
2736                 rdev_warn(rdev, "ramp_delay not set\n");
2737                 return 0;
2738         }
2739
2740         /* sanity check */
2741         if (!rdev->desc->ops->list_voltage)
2742                 return -EINVAL;
2743
2744         old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2745         new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2746
2747         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2748 }
2749 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2750
2751 /**
2752  * regulator_sync_voltage - re-apply last regulator output voltage
2753  * @regulator: regulator source
2754  *
2755  * Re-apply the last configured voltage.  This is intended to be used
2756  * where some external control source the consumer is cooperating with
2757  * has caused the configured voltage to change.
2758  */
2759 int regulator_sync_voltage(struct regulator *regulator)
2760 {
2761         struct regulator_dev *rdev = regulator->rdev;
2762         int ret, min_uV, max_uV;
2763
2764         mutex_lock(&rdev->mutex);
2765
2766         if (!rdev->desc->ops->set_voltage &&
2767             !rdev->desc->ops->set_voltage_sel) {
2768                 ret = -EINVAL;
2769                 goto out;
2770         }
2771
2772         /* This is only going to work if we've had a voltage configured. */
2773         if (!regulator->min_uV && !regulator->max_uV) {
2774                 ret = -EINVAL;
2775                 goto out;
2776         }
2777
2778         min_uV = regulator->min_uV;
2779         max_uV = regulator->max_uV;
2780
2781         /* This should be a paranoia check... */
2782         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2783         if (ret < 0)
2784                 goto out;
2785
2786         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2787         if (ret < 0)
2788                 goto out;
2789
2790         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2791
2792 out:
2793         mutex_unlock(&rdev->mutex);
2794         return ret;
2795 }
2796 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2797
2798 static int _regulator_get_voltage(struct regulator_dev *rdev)
2799 {
2800         int sel, ret;
2801
2802         if (rdev->desc->ops->get_voltage_sel) {
2803                 sel = rdev->desc->ops->get_voltage_sel(rdev);
2804                 if (sel < 0)
2805                         return sel;
2806                 ret = rdev->desc->ops->list_voltage(rdev, sel);
2807         } else if (rdev->desc->ops->get_voltage) {
2808                 ret = rdev->desc->ops->get_voltage(rdev);
2809         } else if (rdev->desc->ops->list_voltage) {
2810                 ret = rdev->desc->ops->list_voltage(rdev, 0);
2811         } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2812                 ret = rdev->desc->fixed_uV;
2813         } else if (rdev->supply) {
2814                 ret = regulator_get_voltage(rdev->supply);
2815         } else {
2816                 return -EINVAL;
2817         }
2818
2819         if (ret < 0)
2820                 return ret;
2821         return ret - rdev->constraints->uV_offset;
2822 }
2823
2824 /**
2825  * regulator_get_voltage - get regulator output voltage
2826  * @regulator: regulator source
2827  *
2828  * This returns the current regulator voltage in uV.
2829  *
2830  * NOTE: If the regulator is disabled it will return the voltage value. This
2831  * function should not be used to determine regulator state.
2832  */
2833 int regulator_get_voltage(struct regulator *regulator)
2834 {
2835         int ret;
2836
2837         mutex_lock(&regulator->rdev->mutex);
2838
2839         ret = _regulator_get_voltage(regulator->rdev);
2840
2841         mutex_unlock(&regulator->rdev->mutex);
2842
2843         return ret;
2844 }
2845 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2846
2847 /**
2848  * regulator_set_current_limit - set regulator output current limit
2849  * @regulator: regulator source
2850  * @min_uA: Minimum supported current in uA
2851  * @max_uA: Maximum supported current in uA
2852  *
2853  * Sets current sink to the desired output current. This can be set during
2854  * any regulator state. IOW, regulator can be disabled or enabled.
2855  *
2856  * If the regulator is enabled then the current will change to the new value
2857  * immediately otherwise if the regulator is disabled the regulator will
2858  * output at the new current when enabled.
2859  *
2860  * NOTE: Regulator system constraints must be set for this regulator before
2861  * calling this function otherwise this call will fail.
2862  */
2863 int regulator_set_current_limit(struct regulator *regulator,
2864                                int min_uA, int max_uA)
2865 {
2866         struct regulator_dev *rdev = regulator->rdev;
2867         int ret;
2868
2869         mutex_lock(&rdev->mutex);
2870
2871         /* sanity check */
2872         if (!rdev->desc->ops->set_current_limit) {
2873                 ret = -EINVAL;
2874                 goto out;
2875         }
2876
2877         /* constraints check */
2878         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2879         if (ret < 0)
2880                 goto out;
2881
2882         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2883 out:
2884         mutex_unlock(&rdev->mutex);
2885         return ret;
2886 }
2887 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2888
2889 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2890 {
2891         int ret;
2892
2893         mutex_lock(&rdev->mutex);
2894
2895         /* sanity check */
2896         if (!rdev->desc->ops->get_current_limit) {
2897                 ret = -EINVAL;
2898                 goto out;
2899         }
2900
2901         ret = rdev->desc->ops->get_current_limit(rdev);
2902 out:
2903         mutex_unlock(&rdev->mutex);
2904         return ret;
2905 }
2906
2907 /**
2908  * regulator_get_current_limit - get regulator output current
2909  * @regulator: regulator source
2910  *
2911  * This returns the current supplied by the specified current sink in uA.
2912  *
2913  * NOTE: If the regulator is disabled it will return the current value. This
2914  * function should not be used to determine regulator state.
2915  */
2916 int regulator_get_current_limit(struct regulator *regulator)
2917 {
2918         return _regulator_get_current_limit(regulator->rdev);
2919 }
2920 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2921
2922 /**
2923  * regulator_set_mode - set regulator operating mode
2924  * @regulator: regulator source
2925  * @mode: operating mode - one of the REGULATOR_MODE constants
2926  *
2927  * Set regulator operating mode to increase regulator efficiency or improve
2928  * regulation performance.
2929  *
2930  * NOTE: Regulator system constraints must be set for this regulator before
2931  * calling this function otherwise this call will fail.
2932  */
2933 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2934 {
2935         struct regulator_dev *rdev = regulator->rdev;
2936         int ret;
2937         int regulator_curr_mode;
2938
2939         mutex_lock(&rdev->mutex);
2940
2941         /* sanity check */
2942         if (!rdev->desc->ops->set_mode) {
2943                 ret = -EINVAL;
2944                 goto out;
2945         }
2946
2947         /* return if the same mode is requested */
2948         if (rdev->desc->ops->get_mode) {
2949                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2950                 if (regulator_curr_mode == mode) {
2951                         ret = 0;
2952                         goto out;
2953                 }
2954         }
2955
2956         /* constraints check */
2957         ret = regulator_mode_constrain(rdev, &mode);
2958         if (ret < 0)
2959                 goto out;
2960
2961         ret = rdev->desc->ops->set_mode(rdev, mode);
2962 out:
2963         mutex_unlock(&rdev->mutex);
2964         return ret;
2965 }
2966 EXPORT_SYMBOL_GPL(regulator_set_mode);
2967
2968 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2969 {
2970         int ret;
2971
2972         mutex_lock(&rdev->mutex);
2973
2974         /* sanity check */
2975         if (!rdev->desc->ops->get_mode) {
2976                 ret = -EINVAL;
2977                 goto out;
2978         }
2979
2980         ret = rdev->desc->ops->get_mode(rdev);
2981 out:
2982         mutex_unlock(&rdev->mutex);
2983         return ret;
2984 }
2985
2986 /**
2987  * regulator_get_mode - get regulator operating mode
2988  * @regulator: regulator source
2989  *
2990  * Get the current regulator operating mode.
2991  */
2992 unsigned int regulator_get_mode(struct regulator *regulator)
2993 {
2994         return _regulator_get_mode(regulator->rdev);
2995 }
2996 EXPORT_SYMBOL_GPL(regulator_get_mode);
2997
2998 /**
2999  * regulator_set_optimum_mode - set regulator optimum operating mode
3000  * @regulator: regulator source
3001  * @uA_load: load current
3002  *
3003  * Notifies the regulator core of a new device load. This is then used by
3004  * DRMS (if enabled by constraints) to set the most efficient regulator
3005  * operating mode for the new regulator loading.
3006  *
3007  * Consumer devices notify their supply regulator of the maximum power
3008  * they will require (can be taken from device datasheet in the power
3009  * consumption tables) when they change operational status and hence power
3010  * state. Examples of operational state changes that can affect power
3011  * consumption are :-
3012  *
3013  *    o Device is opened / closed.
3014  *    o Device I/O is about to begin or has just finished.
3015  *    o Device is idling in between work.
3016  *
3017  * This information is also exported via sysfs to userspace.
3018  *
3019  * DRMS will sum the total requested load on the regulator and change
3020  * to the most efficient operating mode if platform constraints allow.
3021  *
3022  * Returns the new regulator mode or error.
3023  */
3024 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
3025 {
3026         struct regulator_dev *rdev = regulator->rdev;
3027         struct regulator *consumer;
3028         int ret, output_uV, input_uV = 0, total_uA_load = 0;
3029         unsigned int mode;
3030
3031         if (rdev->supply)
3032                 input_uV = regulator_get_voltage(rdev->supply);
3033
3034         mutex_lock(&rdev->mutex);
3035
3036         /*
3037          * first check to see if we can set modes at all, otherwise just
3038          * tell the consumer everything is OK.
3039          */
3040         regulator->uA_load = uA_load;
3041         ret = regulator_check_drms(rdev);
3042         if (ret < 0) {
3043                 ret = 0;
3044                 goto out;
3045         }
3046
3047         if (!rdev->desc->ops->get_optimum_mode)
3048                 goto out;
3049
3050         /*
3051          * we can actually do this so any errors are indicators of
3052          * potential real failure.
3053          */
3054         ret = -EINVAL;
3055
3056         if (!rdev->desc->ops->set_mode)
3057                 goto out;
3058
3059         /* get output voltage */
3060         output_uV = _regulator_get_voltage(rdev);
3061         if (output_uV <= 0) {
3062                 rdev_err(rdev, "invalid output voltage found\n");
3063                 goto out;
3064         }
3065
3066         /* No supply? Use constraint voltage */
3067         if (input_uV <= 0)
3068                 input_uV = rdev->constraints->input_uV;
3069         if (input_uV <= 0) {
3070                 rdev_err(rdev, "invalid input voltage found\n");
3071                 goto out;
3072         }
3073
3074         /* calc total requested load for this regulator */
3075         list_for_each_entry(consumer, &rdev->consumer_list, list)
3076                 total_uA_load += consumer->uA_load;
3077
3078         mode = rdev->desc->ops->get_optimum_mode(rdev,
3079                                                  input_uV, output_uV,
3080                                                  total_uA_load);
3081         ret = regulator_mode_constrain(rdev, &mode);
3082         if (ret < 0) {
3083                 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
3084                          total_uA_load, input_uV, output_uV);
3085                 goto out;
3086         }
3087
3088         ret = rdev->desc->ops->set_mode(rdev, mode);
3089         if (ret < 0) {
3090                 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
3091                 goto out;
3092         }
3093         ret = mode;
3094 out:
3095         mutex_unlock(&rdev->mutex);
3096         return ret;
3097 }
3098 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
3099
3100 /**
3101  * regulator_allow_bypass - allow the regulator to go into bypass mode
3102  *
3103  * @regulator: Regulator to configure
3104  * @enable: enable or disable bypass mode
3105  *
3106  * Allow the regulator to go into bypass mode if all other consumers
3107  * for the regulator also enable bypass mode and the machine
3108  * constraints allow this.  Bypass mode means that the regulator is
3109  * simply passing the input directly to the output with no regulation.
3110  */
3111 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3112 {
3113         struct regulator_dev *rdev = regulator->rdev;
3114         int ret = 0;
3115
3116         if (!rdev->desc->ops->set_bypass)
3117                 return 0;
3118
3119         if (rdev->constraints &&
3120             !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
3121                 return 0;
3122
3123         mutex_lock(&rdev->mutex);
3124
3125         if (enable && !regulator->bypass) {
3126                 rdev->bypass_count++;
3127
3128                 if (rdev->bypass_count == rdev->open_count) {
3129                         ret = rdev->desc->ops->set_bypass(rdev, enable);
3130                         if (ret != 0)
3131                                 rdev->bypass_count--;
3132                 }
3133
3134         } else if (!enable && regulator->bypass) {
3135                 rdev->bypass_count--;
3136
3137                 if (rdev->bypass_count != rdev->open_count) {
3138                         ret = rdev->desc->ops->set_bypass(rdev, enable);
3139                         if (ret != 0)
3140                                 rdev->bypass_count++;
3141                 }
3142         }
3143
3144         if (ret == 0)
3145                 regulator->bypass = enable;
3146
3147         mutex_unlock(&rdev->mutex);
3148
3149         return ret;
3150 }
3151 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3152
3153 /**
3154  * regulator_register_notifier - register regulator event notifier
3155  * @regulator: regulator source
3156  * @nb: notifier block
3157  *
3158  * Register notifier block to receive regulator events.
3159  */
3160 int regulator_register_notifier(struct regulator *regulator,
3161                               struct notifier_block *nb)
3162 {
3163         return blocking_notifier_chain_register(&regulator->rdev->notifier,
3164                                                 nb);
3165 }
3166 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3167
3168 /**
3169  * regulator_unregister_notifier - unregister regulator event notifier
3170  * @regulator: regulator source
3171  * @nb: notifier block
3172  *
3173  * Unregister regulator event notifier block.
3174  */
3175 int regulator_unregister_notifier(struct regulator *regulator,
3176                                 struct notifier_block *nb)
3177 {
3178         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3179                                                   nb);
3180 }
3181 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3182
3183 /* notify regulator consumers and downstream regulator consumers.
3184  * Note mutex must be held by caller.
3185  */
3186 static int _notifier_call_chain(struct regulator_dev *rdev,
3187                                   unsigned long event, void *data)
3188 {
3189         /* call rdev chain first */
3190         return blocking_notifier_call_chain(&rdev->notifier, event, data);
3191 }
3192
3193 /**
3194  * regulator_bulk_get - get multiple regulator consumers
3195  *
3196  * @dev:           Device to supply
3197  * @num_consumers: Number of consumers to register
3198  * @consumers:     Configuration of consumers; clients are stored here.
3199  *
3200  * @return 0 on success, an errno on failure.
3201  *
3202  * This helper function allows drivers to get several regulator
3203  * consumers in one operation.  If any of the regulators cannot be
3204  * acquired then any regulators that were allocated will be freed
3205  * before returning to the caller.
3206  */
3207 int regulator_bulk_get(struct device *dev, int num_consumers,
3208                        struct regulator_bulk_data *consumers)
3209 {
3210         int i;
3211         int ret;
3212
3213         for (i = 0; i < num_consumers; i++)
3214                 consumers[i].consumer = NULL;
3215
3216         for (i = 0; i < num_consumers; i++) {
3217                 consumers[i].consumer = regulator_get(dev,
3218                                                       consumers[i].supply);
3219                 if (IS_ERR(consumers[i].consumer)) {
3220                         ret = PTR_ERR(consumers[i].consumer);
3221                         dev_err(dev, "Failed to get supply '%s': %d\n",
3222                                 consumers[i].supply, ret);
3223                         consumers[i].consumer = NULL;
3224                         goto err;
3225                 }
3226         }
3227
3228         return 0;
3229
3230 err:
3231         while (--i >= 0)
3232                 regulator_put(consumers[i].consumer);
3233
3234         return ret;
3235 }
3236 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3237
3238 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3239 {
3240         struct regulator_bulk_data *bulk = data;
3241
3242         bulk->ret = regulator_enable(bulk->consumer);
3243 }
3244
3245 /**
3246  * regulator_bulk_enable - enable multiple regulator consumers
3247  *
3248  * @num_consumers: Number of consumers
3249  * @consumers:     Consumer data; clients are stored here.
3250  * @return         0 on success, an errno on failure
3251  *
3252  * This convenience API allows consumers to enable multiple regulator
3253  * clients in a single API call.  If any consumers cannot be enabled
3254  * then any others that were enabled will be disabled again prior to
3255  * return.
3256  */
3257 int regulator_bulk_enable(int num_consumers,
3258                           struct regulator_bulk_data *consumers)
3259 {
3260         ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3261         int i;
3262         int ret = 0;
3263
3264         for (i = 0; i < num_consumers; i++) {
3265                 if (consumers[i].consumer->always_on)
3266                         consumers[i].ret = 0;
3267                 else
3268                         async_schedule_domain(regulator_bulk_enable_async,
3269                                               &consumers[i], &async_domain);
3270         }
3271
3272         async_synchronize_full_domain(&async_domain);
3273
3274         /* If any consumer failed we need to unwind any that succeeded */
3275         for (i = 0; i < num_consumers; i++) {
3276                 if (consumers[i].ret != 0) {
3277                         ret = consumers[i].ret;
3278                         goto err;
3279                 }
3280         }
3281
3282         return 0;
3283
3284 err:
3285         for (i = 0; i < num_consumers; i++) {
3286                 if (consumers[i].ret < 0)
3287                         pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3288                                consumers[i].ret);
3289                 else
3290                         regulator_disable(consumers[i].consumer);
3291         }
3292
3293         return ret;
3294 }
3295 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3296
3297 /**
3298  * regulator_bulk_disable - disable multiple regulator consumers
3299  *
3300  * @num_consumers: Number of consumers
3301  * @consumers:     Consumer data; clients are stored here.
3302  * @return         0 on success, an errno on failure
3303  *
3304  * This convenience API allows consumers to disable multiple regulator
3305  * clients in a single API call.  If any consumers cannot be disabled
3306  * then any others that were disabled will be enabled again prior to
3307  * return.
3308  */
3309 int regulator_bulk_disable(int num_consumers,
3310                            struct regulator_bulk_data *consumers)
3311 {
3312         int i;
3313         int ret, r;
3314
3315         for (i = num_consumers - 1; i >= 0; --i) {
3316                 ret = regulator_disable(consumers[i].consumer);
3317                 if (ret != 0)
3318                         goto err;
3319         }
3320
3321         return 0;
3322
3323 err:
3324         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3325         for (++i; i < num_consumers; ++i) {
3326                 r = regulator_enable(consumers[i].consumer);
3327                 if (r != 0)
3328                         pr_err("Failed to reename %s: %d\n",
3329                                consumers[i].supply, r);
3330         }
3331
3332         return ret;
3333 }
3334 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3335
3336 /**
3337  * regulator_bulk_force_disable - force disable multiple regulator consumers
3338  *
3339  * @num_consumers: Number of consumers
3340  * @consumers:     Consumer data; clients are stored here.
3341  * @return         0 on success, an errno on failure
3342  *
3343  * This convenience API allows consumers to forcibly disable multiple regulator
3344  * clients in a single API call.
3345  * NOTE: This should be used for situations when device damage will
3346  * likely occur if the regulators are not disabled (e.g. over temp).
3347  * Although regulator_force_disable function call for some consumers can
3348  * return error numbers, the function is called for all consumers.
3349  */
3350 int regulator_bulk_force_disable(int num_consumers,
3351                            struct regulator_bulk_data *consumers)
3352 {
3353         int i;
3354         int ret;
3355
3356         for (i = 0; i < num_consumers; i++)
3357                 consumers[i].ret =
3358                             regulator_force_disable(consumers[i].consumer);
3359
3360         for (i = 0; i < num_consumers; i++) {
3361                 if (consumers[i].ret != 0) {
3362                         ret = consumers[i].ret;
3363                         goto out;
3364                 }
3365         }
3366
3367         return 0;
3368 out:
3369         return ret;
3370 }
3371 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3372
3373 /**
3374  * regulator_bulk_free - free multiple regulator consumers
3375  *
3376  * @num_consumers: Number of consumers
3377  * @consumers:     Consumer data; clients are stored here.
3378  *
3379  * This convenience API allows consumers to free multiple regulator
3380  * clients in a single API call.
3381  */
3382 void regulator_bulk_free(int num_consumers,
3383                          struct regulator_bulk_data *consumers)
3384 {
3385         int i;
3386
3387         for (i = 0; i < num_consumers; i++) {
3388                 regulator_put(consumers[i].consumer);
3389                 consumers[i].consumer = NULL;
3390         }
3391 }
3392 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3393
3394 /**
3395  * regulator_notifier_call_chain - call regulator event notifier
3396  * @rdev: regulator source
3397  * @event: notifier block
3398  * @data: callback-specific data.
3399  *
3400  * Called by regulator drivers to notify clients a regulator event has
3401  * occurred. We also notify regulator clients downstream.
3402  * Note lock must be held by caller.
3403  */
3404 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3405                                   unsigned long event, void *data)
3406 {
3407         _notifier_call_chain(rdev, event, data);
3408         return NOTIFY_DONE;
3409
3410 }
3411 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3412
3413 /**
3414  * regulator_mode_to_status - convert a regulator mode into a status
3415  *
3416  * @mode: Mode to convert
3417  *
3418  * Convert a regulator mode into a status.
3419  */
3420 int regulator_mode_to_status(unsigned int mode)
3421 {
3422         switch (mode) {
3423         case REGULATOR_MODE_FAST:
3424                 return REGULATOR_STATUS_FAST;
3425         case REGULATOR_MODE_NORMAL:
3426                 return REGULATOR_STATUS_NORMAL;
3427         case REGULATOR_MODE_IDLE:
3428                 return REGULATOR_STATUS_IDLE;
3429         case REGULATOR_MODE_STANDBY:
3430                 return REGULATOR_STATUS_STANDBY;
3431         default:
3432                 return REGULATOR_STATUS_UNDEFINED;
3433         }
3434 }
3435 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3436
3437 /*
3438  * To avoid cluttering sysfs (and memory) with useless state, only
3439  * create attributes that can be meaningfully displayed.
3440  */
3441 static int add_regulator_attributes(struct regulator_dev *rdev)
3442 {
3443         struct device *dev = &rdev->dev;
3444         const struct regulator_ops *ops = rdev->desc->ops;
3445         int status = 0;
3446
3447         /* some attributes need specific methods to be displayed */
3448         if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3449             (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3450             (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3451                 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) {
3452                 status = device_create_file(dev, &dev_attr_microvolts);
3453                 if (status < 0)
3454                         return status;
3455         }
3456         if (ops->get_current_limit) {
3457                 status = device_create_file(dev, &dev_attr_microamps);
3458                 if (status < 0)
3459                         return status;
3460         }
3461         if (ops->get_mode) {
3462                 status = device_create_file(dev, &dev_attr_opmode);
3463                 if (status < 0)
3464                         return status;
3465         }
3466         if (rdev->ena_pin || ops->is_enabled) {
3467                 status = device_create_file(dev, &dev_attr_state);
3468                 if (status < 0)
3469                         return status;
3470         }
3471         if (ops->get_status) {
3472                 status = device_create_file(dev, &dev_attr_status);
3473                 if (status < 0)
3474                         return status;
3475         }
3476         if (ops->get_bypass) {
3477                 status = device_create_file(dev, &dev_attr_bypass);
3478                 if (status < 0)
3479                         return status;
3480         }
3481
3482         /* some attributes are type-specific */
3483         if (rdev->desc->type == REGULATOR_CURRENT) {
3484                 status = device_create_file(dev, &dev_attr_requested_microamps);
3485                 if (status < 0)
3486                         return status;
3487         }
3488
3489         /* all the other attributes exist to support constraints;
3490          * don't show them if there are no constraints, or if the
3491          * relevant supporting methods are missing.
3492          */
3493         if (!rdev->constraints)
3494                 return status;
3495
3496         /* constraints need specific supporting methods */
3497         if (ops->set_voltage || ops->set_voltage_sel) {
3498                 status = device_create_file(dev, &dev_attr_min_microvolts);
3499                 if (status < 0)
3500                         return status;
3501                 status = device_create_file(dev, &dev_attr_max_microvolts);
3502                 if (status < 0)
3503                         return status;
3504         }
3505         if (ops->set_current_limit) {
3506                 status = device_create_file(dev, &dev_attr_min_microamps);
3507                 if (status < 0)
3508                         return status;
3509                 status = device_create_file(dev, &dev_attr_max_microamps);
3510                 if (status < 0)
3511                         return status;
3512         }
3513
3514         status = device_create_file(dev, &dev_attr_suspend_standby_state);
3515         if (status < 0)
3516                 return status;
3517         status = device_create_file(dev, &dev_attr_suspend_mem_state);
3518         if (status < 0)
3519                 return status;
3520         status = device_create_file(dev, &dev_attr_suspend_disk_state);
3521         if (status < 0)
3522                 return status;
3523
3524         if (ops->set_suspend_voltage) {
3525                 status = device_create_file(dev,
3526                                 &dev_attr_suspend_standby_microvolts);
3527                 if (status < 0)
3528                         return status;
3529                 status = device_create_file(dev,
3530                                 &dev_attr_suspend_mem_microvolts);
3531                 if (status < 0)
3532                         return status;
3533                 status = device_create_file(dev,
3534                                 &dev_attr_suspend_disk_microvolts);
3535                 if (status < 0)
3536                         return status;
3537         }
3538
3539         if (ops->set_suspend_mode) {
3540                 status = device_create_file(dev,
3541                                 &dev_attr_suspend_standby_mode);
3542                 if (status < 0)
3543                         return status;
3544                 status = device_create_file(dev,
3545                                 &dev_attr_suspend_mem_mode);
3546                 if (status < 0)
3547                         return status;
3548                 status = device_create_file(dev,
3549                                 &dev_attr_suspend_disk_mode);
3550                 if (status < 0)
3551                         return status;
3552         }
3553
3554         return status;
3555 }
3556
3557 static void rdev_init_debugfs(struct regulator_dev *rdev)
3558 {
3559         rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3560         if (!rdev->debugfs) {
3561                 rdev_warn(rdev, "Failed to create debugfs directory\n");
3562                 return;
3563         }
3564
3565         debugfs_create_u32("use_count", 0444, rdev->debugfs,
3566                            &rdev->use_count);
3567         debugfs_create_u32("open_count", 0444, rdev->debugfs,
3568                            &rdev->open_count);
3569         debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3570                            &rdev->bypass_count);
3571 }
3572
3573 /**
3574  * regulator_register - register regulator
3575  * @regulator_desc: regulator to register
3576  * @config: runtime configuration for regulator
3577  *
3578  * Called by regulator drivers to register a regulator.
3579  * Returns a valid pointer to struct regulator_dev on success
3580  * or an ERR_PTR() on error.
3581  */
3582 struct regulator_dev *
3583 regulator_register(const struct regulator_desc *regulator_desc,
3584                    const struct regulator_config *config)
3585 {
3586         const struct regulation_constraints *constraints = NULL;
3587         const struct regulator_init_data *init_data;
3588         static atomic_t regulator_no = ATOMIC_INIT(0);
3589         struct regulator_dev *rdev;
3590         struct device *dev;
3591         int ret, i;
3592         const char *supply = NULL;
3593
3594         if (regulator_desc == NULL || config == NULL)
3595                 return ERR_PTR(-EINVAL);
3596
3597         dev = config->dev;
3598         WARN_ON(!dev);
3599
3600         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3601                 return ERR_PTR(-EINVAL);
3602
3603         if (regulator_desc->type != REGULATOR_VOLTAGE &&
3604             regulator_desc->type != REGULATOR_CURRENT)
3605                 return ERR_PTR(-EINVAL);
3606
3607         /* Only one of each should be implemented */
3608         WARN_ON(regulator_desc->ops->get_voltage &&
3609                 regulator_desc->ops->get_voltage_sel);
3610         WARN_ON(regulator_desc->ops->set_voltage &&
3611                 regulator_desc->ops->set_voltage_sel);
3612
3613         /* If we're using selectors we must implement list_voltage. */
3614         if (regulator_desc->ops->get_voltage_sel &&
3615             !regulator_desc->ops->list_voltage) {
3616                 return ERR_PTR(-EINVAL);
3617         }
3618         if (regulator_desc->ops->set_voltage_sel &&
3619             !regulator_desc->ops->list_voltage) {
3620                 return ERR_PTR(-EINVAL);
3621         }
3622
3623         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3624         if (rdev == NULL)
3625                 return ERR_PTR(-ENOMEM);
3626
3627         init_data = regulator_of_get_init_data(dev, regulator_desc,
3628                                                &rdev->dev.of_node);
3629         if (!init_data) {
3630                 init_data = config->init_data;
3631                 rdev->dev.of_node = of_node_get(config->of_node);
3632         }
3633
3634         mutex_lock(&regulator_list_mutex);
3635
3636         mutex_init(&rdev->mutex);
3637         rdev->reg_data = config->driver_data;
3638         rdev->owner = regulator_desc->owner;
3639         rdev->desc = regulator_desc;
3640         if (config->regmap)
3641                 rdev->regmap = config->regmap;
3642         else if (dev_get_regmap(dev, NULL))
3643                 rdev->regmap = dev_get_regmap(dev, NULL);
3644         else if (dev->parent)
3645                 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3646         INIT_LIST_HEAD(&rdev->consumer_list);
3647         INIT_LIST_HEAD(&rdev->list);
3648         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3649         INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3650
3651         /* preform any regulator specific init */
3652         if (init_data && init_data->regulator_init) {
3653                 ret = init_data->regulator_init(rdev->reg_data);
3654                 if (ret < 0)
3655                         goto clean;
3656         }
3657
3658         /* register with sysfs */
3659         rdev->dev.class = &regulator_class;
3660         rdev->dev.parent = dev;
3661         dev_set_name(&rdev->dev, "regulator.%d",
3662                      atomic_inc_return(&regulator_no) - 1);
3663         ret = device_register(&rdev->dev);
3664         if (ret != 0) {
3665                 put_device(&rdev->dev);
3666                 goto clean;
3667         }
3668
3669         dev_set_drvdata(&rdev->dev, rdev);
3670
3671         if ((config->ena_gpio || config->ena_gpio_initialized) &&
3672             gpio_is_valid(config->ena_gpio)) {
3673                 ret = regulator_ena_gpio_request(rdev, config);
3674                 if (ret != 0) {
3675                         rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3676                                  config->ena_gpio, ret);
3677                         goto wash;
3678                 }
3679
3680                 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3681                         rdev->ena_gpio_state = 1;
3682
3683                 if (config->ena_gpio_invert)
3684                         rdev->ena_gpio_state = !rdev->ena_gpio_state;
3685         }
3686
3687         /* set regulator constraints */
3688         if (init_data)
3689                 constraints = &init_data->constraints;
3690
3691         ret = set_machine_constraints(rdev, constraints);
3692         if (ret < 0)
3693                 goto scrub;
3694
3695         /* add attributes supported by this regulator */
3696         ret = add_regulator_attributes(rdev);
3697         if (ret < 0)
3698                 goto scrub;
3699
3700         if (init_data && init_data->supply_regulator)
3701                 supply = init_data->supply_regulator;
3702         else if (regulator_desc->supply_name)
3703                 supply = regulator_desc->supply_name;
3704
3705         if (supply) {
3706                 struct regulator_dev *r;
3707
3708                 r = regulator_dev_lookup(dev, supply, &ret);
3709
3710                 if (ret == -ENODEV) {
3711                         /*
3712                          * No supply was specified for this regulator and
3713                          * there will never be one.
3714                          */
3715                         ret = 0;
3716                         goto add_dev;
3717                 } else if (!r) {
3718                         dev_err(dev, "Failed to find supply %s\n", supply);
3719                         ret = -EPROBE_DEFER;
3720                         goto scrub;
3721                 }
3722
3723                 ret = set_supply(rdev, r);
3724                 if (ret < 0)
3725                         goto scrub;
3726
3727                 /* Enable supply if rail is enabled */
3728                 if (_regulator_is_enabled(rdev)) {
3729                         ret = regulator_enable(rdev->supply);
3730                         if (ret < 0)
3731                                 goto scrub;
3732                 }
3733         }
3734
3735 add_dev:
3736         /* add consumers devices */
3737         if (init_data) {
3738                 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3739                         ret = set_consumer_device_supply(rdev,
3740                                 init_data->consumer_supplies[i].dev_name,
3741                                 init_data->consumer_supplies[i].supply);
3742                         if (ret < 0) {
3743                                 dev_err(dev, "Failed to set supply %s\n",
3744                                         init_data->consumer_supplies[i].supply);
3745                                 goto unset_supplies;
3746                         }
3747                 }
3748         }
3749
3750         list_add(&rdev->list, &regulator_list);
3751
3752         rdev_init_debugfs(rdev);
3753 out:
3754         mutex_unlock(&regulator_list_mutex);
3755         return rdev;
3756
3757 unset_supplies:
3758         unset_regulator_supplies(rdev);
3759
3760 scrub:
3761         if (rdev->supply)
3762                 _regulator_put(rdev->supply);
3763         regulator_ena_gpio_free(rdev);
3764         kfree(rdev->constraints);
3765 wash:
3766         device_unregister(&rdev->dev);
3767         /* device core frees rdev */
3768         rdev = ERR_PTR(ret);
3769         goto out;
3770
3771 clean:
3772         kfree(rdev);
3773         rdev = ERR_PTR(ret);
3774         goto out;
3775 }
3776 EXPORT_SYMBOL_GPL(regulator_register);
3777
3778 /**
3779  * regulator_unregister - unregister regulator
3780  * @rdev: regulator to unregister
3781  *
3782  * Called by regulator drivers to unregister a regulator.
3783  */
3784 void regulator_unregister(struct regulator_dev *rdev)
3785 {
3786         if (rdev == NULL)
3787                 return;
3788
3789         if (rdev->supply) {
3790                 while (rdev->use_count--)
3791                         regulator_disable(rdev->supply);
3792                 regulator_put(rdev->supply);
3793         }
3794         mutex_lock(&regulator_list_mutex);
3795         debugfs_remove_recursive(rdev->debugfs);
3796         flush_work(&rdev->disable_work.work);
3797         WARN_ON(rdev->open_count);
3798         unset_regulator_supplies(rdev);
3799         list_del(&rdev->list);
3800         kfree(rdev->constraints);
3801         regulator_ena_gpio_free(rdev);
3802         of_node_put(rdev->dev.of_node);
3803         device_unregister(&rdev->dev);
3804         mutex_unlock(&regulator_list_mutex);
3805 }
3806 EXPORT_SYMBOL_GPL(regulator_unregister);
3807
3808 /**
3809  * regulator_suspend_prepare - prepare regulators for system wide suspend
3810  * @state: system suspend state
3811  *
3812  * Configure each regulator with it's suspend operating parameters for state.
3813  * This will usually be called by machine suspend code prior to supending.
3814  */
3815 int regulator_suspend_prepare(suspend_state_t state)
3816 {
3817         struct regulator_dev *rdev;
3818         int ret = 0;
3819
3820         /* ON is handled by regulator active state */
3821         if (state == PM_SUSPEND_ON)
3822                 return -EINVAL;
3823
3824         mutex_lock(&regulator_list_mutex);
3825         list_for_each_entry(rdev, &regulator_list, list) {
3826
3827                 mutex_lock(&rdev->mutex);
3828                 ret = suspend_prepare(rdev, state);
3829                 mutex_unlock(&rdev->mutex);
3830
3831                 if (ret < 0) {
3832                         rdev_err(rdev, "failed to prepare\n");
3833                         goto out;
3834                 }
3835         }
3836 out:
3837         mutex_unlock(&regulator_list_mutex);
3838         return ret;
3839 }
3840 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3841
3842 /**
3843  * regulator_suspend_finish - resume regulators from system wide suspend
3844  *
3845  * Turn on regulators that might be turned off by regulator_suspend_prepare
3846  * and that should be turned on according to the regulators properties.
3847  */
3848 int regulator_suspend_finish(void)
3849 {
3850         struct regulator_dev *rdev;
3851         int ret = 0, error;
3852
3853         mutex_lock(&regulator_list_mutex);
3854         list_for_each_entry(rdev, &regulator_list, list) {
3855                 mutex_lock(&rdev->mutex);
3856                 if (rdev->use_count > 0  || rdev->constraints->always_on) {
3857                         error = _regulator_do_enable(rdev);
3858                         if (error)
3859                                 ret = error;
3860                 } else {
3861                         if (!have_full_constraints())
3862                                 goto unlock;
3863                         if (!_regulator_is_enabled(rdev))
3864                                 goto unlock;
3865
3866                         error = _regulator_do_disable(rdev);
3867                         if (error)
3868                                 ret = error;
3869                 }
3870 unlock:
3871                 mutex_unlock(&rdev->mutex);
3872         }
3873         mutex_unlock(&regulator_list_mutex);
3874         return ret;
3875 }
3876 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3877
3878 /**
3879  * regulator_has_full_constraints - the system has fully specified constraints
3880  *
3881  * Calling this function will cause the regulator API to disable all
3882  * regulators which have a zero use count and don't have an always_on
3883  * constraint in a late_initcall.
3884  *
3885  * The intention is that this will become the default behaviour in a
3886  * future kernel release so users are encouraged to use this facility
3887  * now.
3888  */
3889 void regulator_has_full_constraints(void)
3890 {
3891         has_full_constraints = 1;
3892 }
3893 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3894
3895 /**
3896  * rdev_get_drvdata - get rdev regulator driver data
3897  * @rdev: regulator
3898  *
3899  * Get rdev regulator driver private data. This call can be used in the
3900  * regulator driver context.
3901  */
3902 void *rdev_get_drvdata(struct regulator_dev *rdev)
3903 {
3904         return rdev->reg_data;
3905 }
3906 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3907
3908 /**
3909  * regulator_get_drvdata - get regulator driver data
3910  * @regulator: regulator
3911  *
3912  * Get regulator driver private data. This call can be used in the consumer
3913  * driver context when non API regulator specific functions need to be called.
3914  */
3915 void *regulator_get_drvdata(struct regulator *regulator)
3916 {
3917         return regulator->rdev->reg_data;
3918 }
3919 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3920
3921 /**
3922  * regulator_set_drvdata - set regulator driver data
3923  * @regulator: regulator
3924  * @data: data
3925  */
3926 void regulator_set_drvdata(struct regulator *regulator, void *data)
3927 {
3928         regulator->rdev->reg_data = data;
3929 }
3930 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3931
3932 /**
3933  * regulator_get_id - get regulator ID
3934  * @rdev: regulator
3935  */
3936 int rdev_get_id(struct regulator_dev *rdev)
3937 {
3938         return rdev->desc->id;
3939 }
3940 EXPORT_SYMBOL_GPL(rdev_get_id);
3941
3942 struct device *rdev_get_dev(struct regulator_dev *rdev)
3943 {
3944         return &rdev->dev;
3945 }
3946 EXPORT_SYMBOL_GPL(rdev_get_dev);
3947
3948 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3949 {
3950         return reg_init_data->driver_data;
3951 }
3952 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3953
3954 #ifdef CONFIG_DEBUG_FS
3955 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3956                                     size_t count, loff_t *ppos)
3957 {
3958         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3959         ssize_t len, ret = 0;
3960         struct regulator_map *map;
3961
3962         if (!buf)
3963                 return -ENOMEM;
3964
3965         list_for_each_entry(map, &regulator_map_list, list) {
3966                 len = snprintf(buf + ret, PAGE_SIZE - ret,
3967                                "%s -> %s.%s\n",
3968                                rdev_get_name(map->regulator), map->dev_name,
3969                                map->supply);
3970                 if (len >= 0)
3971                         ret += len;
3972                 if (ret > PAGE_SIZE) {
3973                         ret = PAGE_SIZE;
3974                         break;
3975                 }
3976         }
3977
3978         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3979
3980         kfree(buf);
3981
3982         return ret;
3983 }
3984 #endif
3985
3986 static const struct file_operations supply_map_fops = {
3987 #ifdef CONFIG_DEBUG_FS
3988         .read = supply_map_read_file,
3989         .llseek = default_llseek,
3990 #endif
3991 };
3992
3993 static int __init regulator_init(void)
3994 {
3995         int ret;
3996
3997         ret = class_register(&regulator_class);
3998
3999         debugfs_root = debugfs_create_dir("regulator", NULL);
4000         if (!debugfs_root)
4001                 pr_warn("regulator: Failed to create debugfs directory\n");
4002
4003         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4004                             &supply_map_fops);
4005
4006         regulator_dummy_init();
4007
4008         return ret;
4009 }
4010
4011 /* init early to allow our consumers to complete system booting */
4012 core_initcall(regulator_init);
4013
4014 static int __init regulator_init_complete(void)
4015 {
4016         struct regulator_dev *rdev;
4017         const struct regulator_ops *ops;
4018         struct regulation_constraints *c;
4019         int enabled, ret;
4020
4021         /*
4022          * Since DT doesn't provide an idiomatic mechanism for
4023          * enabling full constraints and since it's much more natural
4024          * with DT to provide them just assume that a DT enabled
4025          * system has full constraints.
4026          */
4027         if (of_have_populated_dt())
4028                 has_full_constraints = true;
4029
4030         mutex_lock(&regulator_list_mutex);
4031
4032         /* If we have a full configuration then disable any regulators
4033          * we have permission to change the status for and which are
4034          * not in use or always_on.  This is effectively the default
4035          * for DT and ACPI as they have full constraints.
4036          */
4037         list_for_each_entry(rdev, &regulator_list, list) {
4038                 ops = rdev->desc->ops;
4039                 c = rdev->constraints;
4040
4041                 if (c && c->always_on)
4042                         continue;
4043
4044                 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
4045                         continue;
4046
4047                 mutex_lock(&rdev->mutex);
4048
4049                 if (rdev->use_count)
4050                         goto unlock;
4051
4052                 /* If we can't read the status assume it's on. */
4053                 if (ops->is_enabled)
4054                         enabled = ops->is_enabled(rdev);
4055                 else
4056                         enabled = 1;
4057
4058                 if (!enabled)
4059                         goto unlock;
4060
4061                 if (have_full_constraints()) {
4062                         /* We log since this may kill the system if it
4063                          * goes wrong. */
4064                         rdev_info(rdev, "disabling\n");
4065                         ret = _regulator_do_disable(rdev);
4066                         if (ret != 0)
4067                                 rdev_err(rdev, "couldn't disable: %d\n", ret);
4068                 } else {
4069                         /* The intention is that in future we will
4070                          * assume that full constraints are provided
4071                          * so warn even if we aren't going to do
4072                          * anything here.
4073                          */
4074                         rdev_warn(rdev, "incomplete constraints, leaving on\n");
4075                 }
4076
4077 unlock:
4078                 mutex_unlock(&rdev->mutex);
4079         }
4080
4081         mutex_unlock(&regulator_list_mutex);
4082
4083         return 0;
4084 }
4085 late_initcall_sync(regulator_init_complete);