drivers/regulator/core.c

   1 /*
   2  * core.c  --  Voltage/Current Regulator framework.
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  * Copyright 2008 SlimLogic Ltd.
   6  *
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/device.h>
  20 #include <linux/slab.h>
  21 #include <linux/async.h>
  22 #include <linux/err.h>
  23 #include <linux/mutex.h>
  24 #include <linux/suspend.h>
  25 #include <linux/delay.h>
  26 #include <linux/gpio.h>
  27 #include <linux/of.h>
  28 #include <linux/regmap.h>
  29 #include <linux/regulator/of_regulator.h>
  30 #include <linux/regulator/consumer.h>
  31 #include <linux/regulator/driver.h>
  32 #include <linux/regulator/machine.h>
  33 #include <linux/module.h>
  34
  35 #define CREATE_TRACE_POINTS
  36 #include <trace/events/regulator.h>
  37
  38 #include "dummy.h"
  39 #include "internal.h"
  40
  41 #define rdev_crit(rdev, fmt, ...)                                       \
  42         pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  43 #define rdev_err(rdev, fmt, ...)                                        \
  44         pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  45 #define rdev_warn(rdev, fmt, ...)                                       \
  46         pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  47 #define rdev_info(rdev, fmt, ...)                                       \
  48         pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  49 #define rdev_dbg(rdev, fmt, ...)                                        \
  50         pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  51
  52 static DEFINE_MUTEX(regulator_list_mutex);
  53 static LIST_HEAD(regulator_list);
  54 static LIST_HEAD(regulator_map_list);
  55 static LIST_HEAD(regulator_ena_gpio_list);
  56 static LIST_HEAD(regulator_supply_alias_list);
  57 static bool has_full_constraints;
  58
  59 static struct dentry *debugfs_root;
  60
  61 /*
  62  * struct regulator_map
  63  *
  64  * Used to provide symbolic supply names to devices.
  65  */
  66 struct regulator_map {
  67         struct list_head list;
  68         const char *dev_name;   /* The dev_name() for the consumer */
  69         const char *supply;
  70         struct regulator_dev *regulator;
  71 };
  72
  73 /*
  74  * struct regulator_enable_gpio
  75  *
  76  * Management for shared enable GPIO pin
  77  */
  78 struct regulator_enable_gpio {
  79         struct list_head list;
  80         int gpio;
  81         u32 enable_count;       /* a number of enabled shared GPIO */
  82         u32 request_count;      /* a number of requested shared GPIO */
  83         unsigned int ena_gpio_invert:1;
  84 };
  85
  86 /*
  87  * struct regulator_supply_alias
  88  *
  89  * Used to map lookups for a supply onto an alternative device.
  90  */
  91 struct regulator_supply_alias {
  92         struct list_head list;
  93         struct device *src_dev;
  94         const char *src_supply;
  95         struct device *alias_dev;
  96         const char *alias_supply;
  97 };
  98
  99 static int _regulator_is_enabled(struct regulator_dev *rdev);
 100 static int _regulator_disable(struct regulator_dev *rdev);
 101 static int _regulator_get_voltage(struct regulator_dev *rdev);
 102 static int _regulator_get_current_limit(struct regulator_dev *rdev);
 103 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
 104 static void _notifier_call_chain(struct regulator_dev *rdev,
 105                                   unsigned long event, void *data);
 106 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 107                                      int min_uV, int max_uV);
 108 static struct regulator *create_regulator(struct regulator_dev *rdev,
 109                                           struct device *dev,
 110                                           const char *supply_name);
 111
 112 static const char *rdev_get_name(struct regulator_dev *rdev)
 113 {
 114         if (rdev->constraints && rdev->constraints->name)
 115                 return rdev->constraints->name;
 116         else if (rdev->desc->name)
 117                 return rdev->desc->name;
 118         else
 119                 return "";
 120 }
 121
 122 /**
 123  * of_get_regulator - get a regulator device node based on supply name
 124  * @dev: Device pointer for the consumer (of regulator) device
 125  * @supply: regulator supply name
 126  *
 127  * Extract the regulator device node corresponding to the supply name.
 128  * returns the device node corresponding to the regulator if found, else
 129  * returns NULL.
 130  */
 131 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 132 {
 133         struct device_node *regnode = NULL;
 134         char prop_name[32]; /* 32 is max size of property name */
 135
 136         dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
 137
 138         snprintf(prop_name, 32, "%s-supply", supply);
 139         regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 140
 141         if (!regnode) {
 142                 dev_dbg(dev, "Looking up %s property in node %s failed",
 143                                 prop_name, dev->of_node->full_name);
 144                 return NULL;
 145         }
 146         return regnode;
 147 }
 148
 149 static int _regulator_can_change_status(struct regulator_dev *rdev)
 150 {
 151         if (!rdev->constraints)
 152                 return 0;
 153
 154         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
 155                 return 1;
 156         else
 157                 return 0;
 158 }
 159
 160 /* Platform voltage constraint check */
 161 static int regulator_check_voltage(struct regulator_dev *rdev,
 162                                    int *min_uV, int *max_uV)
 163 {
 164         BUG_ON(*min_uV > *max_uV);
 165
 166         if (!rdev->constraints) {
 167                 rdev_err(rdev, "no constraints\n");
 168                 return -ENODEV;
 169         }
 170         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 171                 rdev_err(rdev, "operation not allowed\n");
 172                 return -EPERM;
 173         }
 174
 175         if (*max_uV > rdev->constraints->max_uV)
 176                 *max_uV = rdev->constraints->max_uV;
 177         if (*min_uV < rdev->constraints->min_uV)
 178                 *min_uV = rdev->constraints->min_uV;
 179
 180         if (*min_uV > *max_uV) {
 181                 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
 182                          *min_uV, *max_uV);
 183                 return -EINVAL;
 184         }
 185
 186         return 0;
 187 }
 188
 189 /* Make sure we select a voltage that suits the needs of all
 190  * regulator consumers
 191  */
 192 static int regulator_check_consumers(struct regulator_dev *rdev,
 193                                      int *min_uV, int *max_uV)
 194 {
 195         struct regulator *regulator;
 196
 197         list_for_each_entry(regulator, &rdev->consumer_list, list) {
 198                 /*
 199                  * Assume consumers that didn't say anything are OK
 200                  * with anything in the constraint range.
 201                  */
 202                 if (!regulator->min_uV && !regulator->max_uV)
 203                         continue;
 204
 205                 if (*max_uV > regulator->max_uV)
 206                         *max_uV = regulator->max_uV;
 207                 if (*min_uV < regulator->min_uV)
 208                         *min_uV = regulator->min_uV;
 209         }
 210
 211         if (*min_uV > *max_uV) {
 212                 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
 213                         *min_uV, *max_uV);
 214                 return -EINVAL;
 215         }
 216
 217         return 0;
 218 }
 219
 220 /* current constraint check */
 221 static int regulator_check_current_limit(struct regulator_dev *rdev,
 222                                         int *min_uA, int *max_uA)
 223 {
 224         BUG_ON(*min_uA > *max_uA);
 225
 226         if (!rdev->constraints) {
 227                 rdev_err(rdev, "no constraints\n");
 228                 return -ENODEV;
 229         }
 230         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 231                 rdev_err(rdev, "operation not allowed\n");
 232                 return -EPERM;
 233         }
 234
 235         if (*max_uA > rdev->constraints->max_uA)
 236                 *max_uA = rdev->constraints->max_uA;
 237         if (*min_uA < rdev->constraints->min_uA)
 238                 *min_uA = rdev->constraints->min_uA;
 239
 240         if (*min_uA > *max_uA) {
 241                 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
 242                          *min_uA, *max_uA);
 243                 return -EINVAL;
 244         }
 245
 246         return 0;
 247 }
 248
 249 /* operating mode constraint check */
 250 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
 251 {
 252         switch (*mode) {
 253         case REGULATOR_MODE_FAST:
 254         case REGULATOR_MODE_NORMAL:
 255         case REGULATOR_MODE_IDLE:
 256         case REGULATOR_MODE_STANDBY:
 257                 break;
 258         default:
 259                 rdev_err(rdev, "invalid mode %x specified\n", *mode);
 260                 return -EINVAL;
 261         }
 262
 263         if (!rdev->constraints) {
 264                 rdev_err(rdev, "no constraints\n");
 265                 return -ENODEV;
 266         }
 267         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 268                 rdev_err(rdev, "operation not allowed\n");
 269                 return -EPERM;
 270         }
 271
 272         /* The modes are bitmasks, the most power hungry modes having
 273          * the lowest values. If the requested mode isn't supported
 274          * try higher modes. */
 275         while (*mode) {
 276                 if (rdev->constraints->valid_modes_mask & *mode)
 277                         return 0;
 278                 *mode /= 2;
 279         }
 280
 281         return -EINVAL;
 282 }
 283
 284 /* dynamic regulator mode switching constraint check */
 285 static int regulator_check_drms(struct regulator_dev *rdev)
 286 {
 287         if (!rdev->constraints) {
 288                 rdev_err(rdev, "no constraints\n");
 289                 return -ENODEV;
 290         }
 291         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 292                 rdev_err(rdev, "operation not allowed\n");
 293                 return -EPERM;
 294         }
 295         return 0;
 296 }
 297
 298 static ssize_t regulator_uV_show(struct device *dev,
 299                                 struct device_attribute *attr, char *buf)
 300 {
 301         struct regulator_dev *rdev = dev_get_drvdata(dev);
 302         ssize_t ret;
 303
 304         mutex_lock(&rdev->mutex);
 305         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 306         mutex_unlock(&rdev->mutex);
 307
 308         return ret;
 309 }
 310 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 311
 312 static ssize_t regulator_uA_show(struct device *dev,
 313                                 struct device_attribute *attr, char *buf)
 314 {
 315         struct regulator_dev *rdev = dev_get_drvdata(dev);
 316
 317         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 318 }
 319 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 320
 321 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 322                          char *buf)
 323 {
 324         struct regulator_dev *rdev = dev_get_drvdata(dev);
 325
 326         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 327 }
 328 static DEVICE_ATTR_RO(name);
 329
 330 static ssize_t regulator_print_opmode(char *buf, int mode)
 331 {
 332         switch (mode) {
 333         case REGULATOR_MODE_FAST:
 334                 return sprintf(buf, "fast\n");
 335         case REGULATOR_MODE_NORMAL:
 336                 return sprintf(buf, "normal\n");
 337         case REGULATOR_MODE_IDLE:
 338                 return sprintf(buf, "idle\n");
 339         case REGULATOR_MODE_STANDBY:
 340                 return sprintf(buf, "standby\n");
 341         }
 342         return sprintf(buf, "unknown\n");
 343 }
 344
 345 static ssize_t regulator_opmode_show(struct device *dev,
 346                                     struct device_attribute *attr, char *buf)
 347 {
 348         struct regulator_dev *rdev = dev_get_drvdata(dev);
 349
 350         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 351 }
 352 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 353
 354 static ssize_t regulator_print_state(char *buf, int state)
 355 {
 356         if (state > 0)
 357                 return sprintf(buf, "enabled\n");
 358         else if (state == 0)
 359                 return sprintf(buf, "disabled\n");
 360         else
 361                 return sprintf(buf, "unknown\n");
 362 }
 363
 364 static ssize_t regulator_state_show(struct device *dev,
 365                                    struct device_attribute *attr, char *buf)
 366 {
 367         struct regulator_dev *rdev = dev_get_drvdata(dev);
 368         ssize_t ret;
 369
 370         mutex_lock(&rdev->mutex);
 371         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 372         mutex_unlock(&rdev->mutex);
 373
 374         return ret;
 375 }
 376 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 377
 378 static ssize_t regulator_status_show(struct device *dev,
 379                                    struct device_attribute *attr, char *buf)
 380 {
 381         struct regulator_dev *rdev = dev_get_drvdata(dev);
 382         int status;
 383         char *label;
 384
 385         status = rdev->desc->ops->get_status(rdev);
 386         if (status < 0)
 387                 return status;
 388
 389         switch (status) {
 390         case REGULATOR_STATUS_OFF:
 391                 label = "off";
 392                 break;
 393         case REGULATOR_STATUS_ON:
 394                 label = "on";
 395                 break;
 396         case REGULATOR_STATUS_ERROR:
 397                 label = "error";
 398                 break;
 399         case REGULATOR_STATUS_FAST:
 400                 label = "fast";
 401                 break;
 402         case REGULATOR_STATUS_NORMAL:
 403                 label = "normal";
 404                 break;
 405         case REGULATOR_STATUS_IDLE:
 406                 label = "idle";
 407                 break;
 408         case REGULATOR_STATUS_STANDBY:
 409                 label = "standby";
 410                 break;
 411         case REGULATOR_STATUS_BYPASS:
 412                 label = "bypass";
 413                 break;
 414         case REGULATOR_STATUS_UNDEFINED:
 415                 label = "undefined";
 416                 break;
 417         default:
 418                 return -ERANGE;
 419         }
 420
 421         return sprintf(buf, "%s\n", label);
 422 }
 423 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 424
 425 static ssize_t regulator_min_uA_show(struct device *dev,
 426                                     struct device_attribute *attr, char *buf)
 427 {
 428         struct regulator_dev *rdev = dev_get_drvdata(dev);
 429
 430         if (!rdev->constraints)
 431                 return sprintf(buf, "constraint not defined\n");
 432
 433         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 434 }
 435 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 436
 437 static ssize_t regulator_max_uA_show(struct device *dev,
 438                                     struct device_attribute *attr, char *buf)
 439 {
 440         struct regulator_dev *rdev = dev_get_drvdata(dev);
 441
 442         if (!rdev->constraints)
 443                 return sprintf(buf, "constraint not defined\n");
 444
 445         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 446 }
 447 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 448
 449 static ssize_t regulator_min_uV_show(struct device *dev,
 450                                     struct device_attribute *attr, char *buf)
 451 {
 452         struct regulator_dev *rdev = dev_get_drvdata(dev);
 453
 454         if (!rdev->constraints)
 455                 return sprintf(buf, "constraint not defined\n");
 456
 457         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 458 }
 459 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 460
 461 static ssize_t regulator_max_uV_show(struct device *dev,
 462                                     struct device_attribute *attr, char *buf)
 463 {
 464         struct regulator_dev *rdev = dev_get_drvdata(dev);
 465
 466         if (!rdev->constraints)
 467                 return sprintf(buf, "constraint not defined\n");
 468
 469         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 470 }
 471 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 472
 473 static ssize_t regulator_total_uA_show(struct device *dev,
 474                                       struct device_attribute *attr, char *buf)
 475 {
 476         struct regulator_dev *rdev = dev_get_drvdata(dev);
 477         struct regulator *regulator;
 478         int uA = 0;
 479
 480         mutex_lock(&rdev->mutex);
 481         list_for_each_entry(regulator, &rdev->consumer_list, list)
 482                 uA += regulator->uA_load;
 483         mutex_unlock(&rdev->mutex);
 484         return sprintf(buf, "%d\n", uA);
 485 }
 486 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 487
 488 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
 489                               char *buf)
 490 {
 491         struct regulator_dev *rdev = dev_get_drvdata(dev);
 492         return sprintf(buf, "%d\n", rdev->use_count);
 493 }
 494 static DEVICE_ATTR_RO(num_users);
 495
 496 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 497                          char *buf)
 498 {
 499         struct regulator_dev *rdev = dev_get_drvdata(dev);
 500
 501         switch (rdev->desc->type) {
 502         case REGULATOR_VOLTAGE:
 503                 return sprintf(buf, "voltage\n");
 504         case REGULATOR_CURRENT:
 505                 return sprintf(buf, "current\n");
 506         }
 507         return sprintf(buf, "unknown\n");
 508 }
 509 static DEVICE_ATTR_RO(type);
 510
 511 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 512                                 struct device_attribute *attr, char *buf)
 513 {
 514         struct regulator_dev *rdev = dev_get_drvdata(dev);
 515
 516         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 517 }
 518 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 519                 regulator_suspend_mem_uV_show, NULL);
 520
 521 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 522                                 struct device_attribute *attr, char *buf)
 523 {
 524         struct regulator_dev *rdev = dev_get_drvdata(dev);
 525
 526         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 527 }
 528 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 529                 regulator_suspend_disk_uV_show, NULL);
 530
 531 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 532                                 struct device_attribute *attr, char *buf)
 533 {
 534         struct regulator_dev *rdev = dev_get_drvdata(dev);
 535
 536         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 537 }
 538 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 539                 regulator_suspend_standby_uV_show, NULL);
 540
 541 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 542                                 struct device_attribute *attr, char *buf)
 543 {
 544         struct regulator_dev *rdev = dev_get_drvdata(dev);
 545
 546         return regulator_print_opmode(buf,
 547                 rdev->constraints->state_mem.mode);
 548 }
 549 static DEVICE_ATTR(suspend_mem_mode, 0444,
 550                 regulator_suspend_mem_mode_show, NULL);
 551
 552 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 553                                 struct device_attribute *attr, char *buf)
 554 {
 555         struct regulator_dev *rdev = dev_get_drvdata(dev);
 556
 557         return regulator_print_opmode(buf,
 558                 rdev->constraints->state_disk.mode);
 559 }
 560 static DEVICE_ATTR(suspend_disk_mode, 0444,
 561                 regulator_suspend_disk_mode_show, NULL);
 562
 563 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 564                                 struct device_attribute *attr, char *buf)
 565 {
 566         struct regulator_dev *rdev = dev_get_drvdata(dev);
 567
 568         return regulator_print_opmode(buf,
 569                 rdev->constraints->state_standby.mode);
 570 }
 571 static DEVICE_ATTR(suspend_standby_mode, 0444,
 572                 regulator_suspend_standby_mode_show, NULL);
 573
 574 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 575                                    struct device_attribute *attr, char *buf)
 576 {
 577         struct regulator_dev *rdev = dev_get_drvdata(dev);
 578
 579         return regulator_print_state(buf,
 580                         rdev->constraints->state_mem.enabled);
 581 }
 582 static DEVICE_ATTR(suspend_mem_state, 0444,
 583                 regulator_suspend_mem_state_show, NULL);
 584
 585 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 586                                    struct device_attribute *attr, char *buf)
 587 {
 588         struct regulator_dev *rdev = dev_get_drvdata(dev);
 589
 590         return regulator_print_state(buf,
 591                         rdev->constraints->state_disk.enabled);
 592 }
 593 static DEVICE_ATTR(suspend_disk_state, 0444,
 594                 regulator_suspend_disk_state_show, NULL);
 595
 596 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 597                                    struct device_attribute *attr, char *buf)
 598 {
 599         struct regulator_dev *rdev = dev_get_drvdata(dev);
 600
 601         return regulator_print_state(buf,
 602                         rdev->constraints->state_standby.enabled);
 603 }
 604 static DEVICE_ATTR(suspend_standby_state, 0444,
 605                 regulator_suspend_standby_state_show, NULL);
 606
 607 static ssize_t regulator_bypass_show(struct device *dev,
 608                                      struct device_attribute *attr, char *buf)
 609 {
 610         struct regulator_dev *rdev = dev_get_drvdata(dev);
 611         const char *report;
 612         bool bypass;
 613         int ret;
 614
 615         ret = rdev->desc->ops->get_bypass(rdev, &bypass);
 616
 617         if (ret != 0)
 618                 report = "unknown";
 619         else if (bypass)
 620                 report = "enabled";
 621         else
 622                 report = "disabled";
 623
 624         return sprintf(buf, "%s\n", report);
 625 }
 626 static DEVICE_ATTR(bypass, 0444,
 627                    regulator_bypass_show, NULL);
 628
 629 /*
 630  * These are the only attributes are present for all regulators.
 631  * Other attributes are a function of regulator functionality.
 632  */
 633 static struct attribute *regulator_dev_attrs[] = {
 634         &dev_attr_name.attr,
 635         &dev_attr_num_users.attr,
 636         &dev_attr_type.attr,
 637         NULL,
 638 };
 639 ATTRIBUTE_GROUPS(regulator_dev);
 640
 641 static void regulator_dev_release(struct device *dev)
 642 {
 643         struct regulator_dev *rdev = dev_get_drvdata(dev);
 644         kfree(rdev);
 645 }
 646
 647 static struct class regulator_class = {
 648         .name = "regulator",
 649         .dev_release = regulator_dev_release,
 650         .dev_groups = regulator_dev_groups,
 651 };
 652
 653 /* Calculate the new optimum regulator operating mode based on the new total
 654  * consumer load. All locks held by caller */
 655 static void drms_uA_update(struct regulator_dev *rdev)
 656 {
 657         struct regulator *sibling;
 658         int current_uA = 0, output_uV, input_uV, err;
 659         unsigned int mode;
 660
 661         err = regulator_check_drms(rdev);
 662         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 663             (!rdev->desc->ops->get_voltage &&
 664              !rdev->desc->ops->get_voltage_sel) ||
 665             !rdev->desc->ops->set_mode)
 666                 return;
 667
 668         /* get output voltage */
 669         output_uV = _regulator_get_voltage(rdev);
 670         if (output_uV <= 0)
 671                 return;
 672
 673         /* get input voltage */
 674         input_uV = 0;
 675         if (rdev->supply)
 676                 input_uV = regulator_get_voltage(rdev->supply);
 677         if (input_uV <= 0)
 678                 input_uV = rdev->constraints->input_uV;
 679         if (input_uV <= 0)
 680                 return;
 681
 682         /* calc total requested load */
 683         list_for_each_entry(sibling, &rdev->consumer_list, list)
 684                 current_uA += sibling->uA_load;
 685
 686         /* now get the optimum mode for our new total regulator load */
 687         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 688                                                   output_uV, current_uA);
 689
 690         /* check the new mode is allowed */
 691         err = regulator_mode_constrain(rdev, &mode);
 692         if (err == 0)
 693                 rdev->desc->ops->set_mode(rdev, mode);
 694 }
 695
 696 static int suspend_set_state(struct regulator_dev *rdev,
 697         struct regulator_state *rstate)
 698 {
 699         int ret = 0;
 700
 701         /* If we have no suspend mode configration don't set anything;
 702          * only warn if the driver implements set_suspend_voltage or
 703          * set_suspend_mode callback.
 704          */
 705         if (!rstate->enabled && !rstate->disabled) {
 706                 if (rdev->desc->ops->set_suspend_voltage ||
 707                     rdev->desc->ops->set_suspend_mode)
 708                         rdev_warn(rdev, "No configuration\n");
 709                 return 0;
 710         }
 711
 712         if (rstate->enabled && rstate->disabled) {
 713                 rdev_err(rdev, "invalid configuration\n");
 714                 return -EINVAL;
 715         }
 716
 717         if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
 718                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 719         else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
 720                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 721         else /* OK if set_suspend_enable or set_suspend_disable is NULL */
 722                 ret = 0;
 723
 724         if (ret < 0) {
 725                 rdev_err(rdev, "failed to enabled/disable\n");
 726                 return ret;
 727         }
 728
 729         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 730                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 731                 if (ret < 0) {
 732                         rdev_err(rdev, "failed to set voltage\n");
 733                         return ret;
 734                 }
 735         }
 736
 737         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 738                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 739                 if (ret < 0) {
 740                         rdev_err(rdev, "failed to set mode\n");
 741                         return ret;
 742                 }
 743         }
 744         return ret;
 745 }
 746
 747 /* locks held by caller */
 748 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 749 {
 750         if (!rdev->constraints)
 751                 return -EINVAL;
 752
 753         switch (state) {
 754         case PM_SUSPEND_STANDBY:
 755                 return suspend_set_state(rdev,
 756                         &rdev->constraints->state_standby);
 757         case PM_SUSPEND_MEM:
 758                 return suspend_set_state(rdev,
 759                         &rdev->constraints->state_mem);
 760         case PM_SUSPEND_MAX:
 761                 return suspend_set_state(rdev,
 762                         &rdev->constraints->state_disk);
 763         default:
 764                 return -EINVAL;
 765         }
 766 }
 767
 768 static void print_constraints(struct regulator_dev *rdev)
 769 {
 770         struct regulation_constraints *constraints = rdev->constraints;
 771         char buf[80] = "";
 772         int count = 0;
 773         int ret;
 774
 775         if (constraints->min_uV && constraints->max_uV) {
 776                 if (constraints->min_uV == constraints->max_uV)
 777                         count += sprintf(buf + count, "%d mV ",
 778                                          constraints->min_uV / 1000);
 779                 else
 780                         count += sprintf(buf + count, "%d <--> %d mV ",
 781                                          constraints->min_uV / 1000,
 782                                          constraints->max_uV / 1000);
 783         }
 784
 785         if (!constraints->min_uV ||
 786             constraints->min_uV != constraints->max_uV) {
 787                 ret = _regulator_get_voltage(rdev);
 788                 if (ret > 0)
 789                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
 790         }
 791
 792         if (constraints->uV_offset)
 793                 count += sprintf(buf, "%dmV offset ",
 794                                  constraints->uV_offset / 1000);
 795
 796         if (constraints->min_uA && constraints->max_uA) {
 797                 if (constraints->min_uA == constraints->max_uA)
 798                         count += sprintf(buf + count, "%d mA ",
 799                                          constraints->min_uA / 1000);
 800                 else
 801                         count += sprintf(buf + count, "%d <--> %d mA ",
 802                                          constraints->min_uA / 1000,
 803                                          constraints->max_uA / 1000);
 804         }
 805
 806         if (!constraints->min_uA ||
 807             constraints->min_uA != constraints->max_uA) {
 808                 ret = _regulator_get_current_limit(rdev);
 809                 if (ret > 0)
 810                         count += sprintf(buf + count, "at %d mA ", ret / 1000);
 811         }
 812
 813         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 814                 count += sprintf(buf + count, "fast ");
 815         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 816                 count += sprintf(buf + count, "normal ");
 817         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 818                 count += sprintf(buf + count, "idle ");
 819         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 820                 count += sprintf(buf + count, "standby");
 821
 822         if (!count)
 823                 sprintf(buf, "no parameters");
 824
 825         rdev_info(rdev, "%s\n", buf);
 826
 827         if ((constraints->min_uV != constraints->max_uV) &&
 828             !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
 829                 rdev_warn(rdev,
 830                           "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
 831 }
 832
 833 static int machine_constraints_voltage(struct regulator_dev *rdev,
 834         struct regulation_constraints *constraints)
 835 {
 836         struct regulator_ops *ops = rdev->desc->ops;
 837         int ret;
 838
 839         /* do we need to apply the constraint voltage */
 840         if (rdev->constraints->apply_uV &&
 841             rdev->constraints->min_uV == rdev->constraints->max_uV) {
 842                 ret = _regulator_do_set_voltage(rdev,
 843                                                 rdev->constraints->min_uV,
 844                                                 rdev->constraints->max_uV);
 845                 if (ret < 0) {
 846                         rdev_err(rdev, "failed to apply %duV constraint\n",
 847                                  rdev->constraints->min_uV);
 848                         return ret;
 849                 }
 850         }
 851
 852         /* constrain machine-level voltage specs to fit
 853          * the actual range supported by this regulator.
 854          */
 855         if (ops->list_voltage && rdev->desc->n_voltages) {
 856                 int     count = rdev->desc->n_voltages;
 857                 int     i;
 858                 int     min_uV = INT_MAX;
 859                 int     max_uV = INT_MIN;
 860                 int     cmin = constraints->min_uV;
 861                 int     cmax = constraints->max_uV;
 862
 863                 /* it's safe to autoconfigure fixed-voltage supplies
 864                    and the constraints are used by list_voltage. */
 865                 if (count == 1 && !cmin) {
 866                         cmin = 1;
 867                         cmax = INT_MAX;
 868                         constraints->min_uV = cmin;
 869                         constraints->max_uV = cmax;
 870                 }
 871
 872                 /* voltage constraints are optional */
 873                 if ((cmin == 0) && (cmax == 0))
 874                         return 0;
 875
 876                 /* else require explicit machine-level constraints */
 877                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 878                         rdev_err(rdev, "invalid voltage constraints\n");
 879                         return -EINVAL;
 880                 }
 881
 882                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 883                 for (i = 0; i < count; i++) {
 884                         int     value;
 885
 886                         value = ops->list_voltage(rdev, i);
 887                         if (value <= 0)
 888                                 continue;
 889
 890                         /* maybe adjust [min_uV..max_uV] */
 891                         if (value >= cmin && value < min_uV)
 892                                 min_uV = value;
 893                         if (value <= cmax && value > max_uV)
 894                                 max_uV = value;
 895                 }
 896
 897                 /* final: [min_uV..max_uV] valid iff constraints valid */
 898                 if (max_uV < min_uV) {
 899                         rdev_err(rdev,
 900                                  "unsupportable voltage constraints %u-%uuV\n",
 901                                  min_uV, max_uV);
 902                         return -EINVAL;
 903                 }
 904
 905                 /* use regulator's subset of machine constraints */
 906                 if (constraints->min_uV < min_uV) {
 907                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
 908                                  constraints->min_uV, min_uV);
 909                         constraints->min_uV = min_uV;
 910                 }
 911                 if (constraints->max_uV > max_uV) {
 912                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
 913                                  constraints->max_uV, max_uV);
 914                         constraints->max_uV = max_uV;
 915                 }
 916         }
 917
 918         return 0;
 919 }
 920
 921 static int machine_constraints_current(struct regulator_dev *rdev,
 922         struct regulation_constraints *constraints)
 923 {
 924         struct regulator_ops *ops = rdev->desc->ops;
 925         int ret;
 926
 927         if (!constraints->min_uA && !constraints->max_uA)
 928                 return 0;
 929
 930         if (constraints->min_uA > constraints->max_uA) {
 931                 rdev_err(rdev, "Invalid current constraints\n");
 932                 return -EINVAL;
 933         }
 934
 935         if (!ops->set_current_limit || !ops->get_current_limit) {
 936                 rdev_warn(rdev, "Operation of current configuration missing\n");
 937                 return 0;
 938         }
 939
 940         /* Set regulator current in constraints range */
 941         ret = ops->set_current_limit(rdev, constraints->min_uA,
 942                         constraints->max_uA);
 943         if (ret < 0) {
 944                 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
 945                 return ret;
 946         }
 947
 948         return 0;
 949 }
 950
 951 /**
 952  * set_machine_constraints - sets regulator constraints
 953  * @rdev: regulator source
 954  * @constraints: constraints to apply
 955  *
 956  * Allows platform initialisation code to define and constrain
 957  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 958  * Constraints *must* be set by platform code in order for some
 959  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 960  * set_mode.
 961  */
 962 static int set_machine_constraints(struct regulator_dev *rdev,
 963         const struct regulation_constraints *constraints)
 964 {
 965         int ret = 0;
 966         struct regulator_ops *ops = rdev->desc->ops;
 967
 968         if (constraints)
 969                 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
 970                                             GFP_KERNEL);
 971         else
 972                 rdev->constraints = kzalloc(sizeof(*constraints),
 973                                             GFP_KERNEL);
 974         if (!rdev->constraints)
 975                 return -ENOMEM;
 976
 977         ret = machine_constraints_voltage(rdev, rdev->constraints);
 978         if (ret != 0)
 979                 goto out;
 980
 981         ret = machine_constraints_current(rdev, rdev->constraints);
 982         if (ret != 0)
 983                 goto out;
 984
 985         /* do we need to setup our suspend state */
 986         if (rdev->constraints->initial_state) {
 987                 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
 988                 if (ret < 0) {
 989                         rdev_err(rdev, "failed to set suspend state\n");
 990                         goto out;
 991                 }
 992         }
 993
 994         if (rdev->constraints->initial_mode) {
 995                 if (!ops->set_mode) {
 996                         rdev_err(rdev, "no set_mode operation\n");
 997                         ret = -EINVAL;
 998                         goto out;
 999                 }
1000
1001                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1002                 if (ret < 0) {
1003                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1004                         goto out;
1005                 }
1006         }
1007
1008         /* If the constraints say the regulator should be on at this point
1009          * and we have control then make sure it is enabled.
1010          */
1011         if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
1012             ops->enable) {
1013                 ret = ops->enable(rdev);
1014                 if (ret < 0) {
1015                         rdev_err(rdev, "failed to enable\n");
1016                         goto out;
1017                 }
1018         }
1019
1020         if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1021                 && ops->set_ramp_delay) {
1022                 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1023                 if (ret < 0) {
1024                         rdev_err(rdev, "failed to set ramp_delay\n");
1025                         goto out;
1026                 }
1027         }
1028
1029         print_constraints(rdev);
1030         return 0;
1031 out:
1032         kfree(rdev->constraints);
1033         rdev->constraints = NULL;
1034         return ret;
1035 }
1036
1037 /**
1038  * set_supply - set regulator supply regulator
1039  * @rdev: regulator name
1040  * @supply_rdev: supply regulator name
1041  *
1042  * Called by platform initialisation code to set the supply regulator for this
1043  * regulator. This ensures that a regulators supply will also be enabled by the
1044  * core if it's child is enabled.
1045  */
1046 static int set_supply(struct regulator_dev *rdev,
1047                       struct regulator_dev *supply_rdev)
1048 {
1049         int err;
1050
1051         rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1052
1053         rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1054         if (rdev->supply == NULL) {
1055                 err = -ENOMEM;
1056                 return err;
1057         }
1058         supply_rdev->open_count++;
1059
1060         return 0;
1061 }
1062
1063 /**
1064  * set_consumer_device_supply - Bind a regulator to a symbolic supply
1065  * @rdev:         regulator source
1066  * @consumer_dev_name: dev_name() string for device supply applies to
1067  * @supply:       symbolic name for supply
1068  *
1069  * Allows platform initialisation code to map physical regulator
1070  * sources to symbolic names for supplies for use by devices.  Devices
1071  * should use these symbolic names to request regulators, avoiding the
1072  * need to provide board-specific regulator names as platform data.
1073  */
1074 static int set_consumer_device_supply(struct regulator_dev *rdev,
1075                                       const char *consumer_dev_name,
1076                                       const char *supply)
1077 {
1078         struct regulator_map *node;
1079         int has_dev;
1080
1081         if (supply == NULL)
1082                 return -EINVAL;
1083
1084         if (consumer_dev_name != NULL)
1085                 has_dev = 1;
1086         else
1087                 has_dev = 0;
1088
1089         list_for_each_entry(node, &regulator_map_list, list) {
1090                 if (node->dev_name && consumer_dev_name) {
1091                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
1092                                 continue;
1093                 } else if (node->dev_name || consumer_dev_name) {
1094                         continue;
1095                 }
1096
1097                 if (strcmp(node->supply, supply) != 0)
1098                         continue;
1099
1100                 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1101                          consumer_dev_name,
1102                          dev_name(&node->regulator->dev),
1103                          node->regulator->desc->name,
1104                          supply,
1105                          dev_name(&rdev->dev), rdev_get_name(rdev));
1106                 return -EBUSY;
1107         }
1108
1109         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1110         if (node == NULL)
1111                 return -ENOMEM;
1112
1113         node->regulator = rdev;
1114         node->supply = supply;
1115
1116         if (has_dev) {
1117                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1118                 if (node->dev_name == NULL) {
1119                         kfree(node);
1120                         return -ENOMEM;
1121                 }
1122         }
1123
1124         list_add(&node->list, &regulator_map_list);
1125         return 0;
1126 }
1127
1128 static void unset_regulator_supplies(struct regulator_dev *rdev)
1129 {
1130         struct regulator_map *node, *n;
1131
1132         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1133                 if (rdev == node->regulator) {
1134                         list_del(&node->list);
1135                         kfree(node->dev_name);
1136                         kfree(node);
1137                 }
1138         }
1139 }
1140
1141 #define REG_STR_SIZE    64
1142
1143 static struct regulator *create_regulator(struct regulator_dev *rdev,
1144                                           struct device *dev,
1145                                           const char *supply_name)
1146 {
1147         struct regulator *regulator;
1148         char buf[REG_STR_SIZE];
1149         int err, size;
1150
1151         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1152         if (regulator == NULL)
1153                 return NULL;
1154
1155         mutex_lock(&rdev->mutex);
1156         regulator->rdev = rdev;
1157         list_add(&regulator->list, &rdev->consumer_list);
1158
1159         if (dev) {
1160                 regulator->dev = dev;
1161
1162                 /* Add a link to the device sysfs entry */
1163                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1164                                  dev->kobj.name, supply_name);
1165                 if (size >= REG_STR_SIZE)
1166                         goto overflow_err;
1167
1168                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1169                 if (regulator->supply_name == NULL)
1170                         goto overflow_err;
1171
1172                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1173                                         buf);
1174                 if (err) {
1175                         rdev_warn(rdev, "could not add device link %s err %d\n",
1176                                   dev->kobj.name, err);
1177                         /* non-fatal */
1178                 }
1179         } else {
1180                 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1181                 if (regulator->supply_name == NULL)
1182                         goto overflow_err;
1183         }
1184
1185         regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1186                                                 rdev->debugfs);
1187         if (!regulator->debugfs) {
1188                 rdev_warn(rdev, "Failed to create debugfs directory\n");
1189         } else {
1190                 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1191                                    &regulator->uA_load);
1192                 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1193                                    &regulator->min_uV);
1194                 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1195                                    &regulator->max_uV);
1196         }
1197
1198         /*
1199          * Check now if the regulator is an always on regulator - if
1200          * it is then we don't need to do nearly so much work for
1201          * enable/disable calls.
1202          */
1203         if (!_regulator_can_change_status(rdev) &&
1204             _regulator_is_enabled(rdev))
1205                 regulator->always_on = true;
1206
1207         mutex_unlock(&rdev->mutex);
1208         return regulator;
1209 overflow_err:
1210         list_del(&regulator->list);
1211         kfree(regulator);
1212         mutex_unlock(&rdev->mutex);
1213         return NULL;
1214 }
1215
1216 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1217 {
1218         if (rdev->constraints && rdev->constraints->enable_time)
1219                 return rdev->constraints->enable_time;
1220         if (!rdev->desc->ops->enable_time)
1221                 return rdev->desc->enable_time;
1222         return rdev->desc->ops->enable_time(rdev);
1223 }
1224
1225 static struct regulator_supply_alias *regulator_find_supply_alias(
1226                 struct device *dev, const char *supply)
1227 {
1228         struct regulator_supply_alias *map;
1229
1230         list_for_each_entry(map, &regulator_supply_alias_list, list)
1231                 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1232                         return map;
1233
1234         return NULL;
1235 }
1236
1237 static void regulator_supply_alias(struct device **dev, const char **supply)
1238 {
1239         struct regulator_supply_alias *map;
1240
1241         map = regulator_find_supply_alias(*dev, *supply);
1242         if (map) {
1243                 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1244                                 *supply, map->alias_supply,
1245                                 dev_name(map->alias_dev));
1246                 *dev = map->alias_dev;
1247                 *supply = map->alias_supply;
1248         }
1249 }
1250
1251 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1252                                                   const char *supply,
1253                                                   int *ret)
1254 {
1255         struct regulator_dev *r;
1256         struct device_node *node;
1257         struct regulator_map *map;
1258         const char *devname = NULL;
1259
1260         regulator_supply_alias(&dev, &supply);
1261
1262         /* first do a dt based lookup */
1263         if (dev && dev->of_node) {
1264                 node = of_get_regulator(dev, supply);
1265                 if (node) {
1266                         list_for_each_entry(r, &regulator_list, list)
1267                                 if (r->dev.parent &&
1268                                         node == r->dev.of_node)
1269                                         return r;
1270                 } else {
1271                         /*
1272                          * If we couldn't even get the node then it's
1273                          * not just that the device didn't register
1274                          * yet, there's no node and we'll never
1275                          * succeed.
1276                          */
1277                         *ret = -ENODEV;
1278                 }
1279         }
1280
1281         /* if not found, try doing it non-dt way */
1282         if (dev)
1283                 devname = dev_name(dev);
1284
1285         list_for_each_entry(r, &regulator_list, list)
1286                 if (strcmp(rdev_get_name(r), supply) == 0)
1287                         return r;
1288
1289         list_for_each_entry(map, &regulator_map_list, list) {
1290                 /* If the mapping has a device set up it must match */
1291                 if (map->dev_name &&
1292                     (!devname || strcmp(map->dev_name, devname)))
1293                         continue;
1294
1295                 if (strcmp(map->supply, supply) == 0)
1296                         return map->regulator;
1297         }
1298
1299
1300         return NULL;
1301 }
1302
1303 /* Internal regulator request function */
1304 static struct regulator *_regulator_get(struct device *dev, const char *id,
1305                                         bool exclusive, bool allow_dummy)
1306 {
1307         struct regulator_dev *rdev;
1308         struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1309         const char *devname = NULL;
1310         int ret = -EPROBE_DEFER;
1311
1312         if (id == NULL) {
1313                 pr_err("get() with no identifier\n");
1314                 return ERR_PTR(-EINVAL);
1315         }
1316
1317         if (dev)
1318                 devname = dev_name(dev);
1319
1320         mutex_lock(&regulator_list_mutex);
1321
1322         rdev = regulator_dev_lookup(dev, id, &ret);
1323         if (rdev)
1324                 goto found;
1325
1326         regulator = ERR_PTR(ret);
1327
1328         /*
1329          * If we have return value from dev_lookup fail, we do not expect to
1330          * succeed, so, quit with appropriate error value
1331          */
1332         if (ret && ret != -ENODEV) {
1333                 goto out;
1334         }
1335
1336         if (!devname)
1337                 devname = "deviceless";
1338
1339         /*
1340          * Assume that a regulator is physically present and enabled
1341          * even if it isn't hooked up and just provide a dummy.
1342          */
1343         if (has_full_constraints && allow_dummy) {
1344                 pr_warn("%s supply %s not found, using dummy regulator\n",
1345                         devname, id);
1346
1347                 rdev = dummy_regulator_rdev;
1348                 goto found;
1349         } else {
1350                 dev_err(dev, "dummy supplies not allowed\n");
1351         }
1352
1353         mutex_unlock(&regulator_list_mutex);
1354         return regulator;
1355
1356 found:
1357         if (rdev->exclusive) {
1358                 regulator = ERR_PTR(-EPERM);
1359                 goto out;
1360         }
1361
1362         if (exclusive && rdev->open_count) {
1363                 regulator = ERR_PTR(-EBUSY);
1364                 goto out;
1365         }
1366
1367         if (!try_module_get(rdev->owner))
1368                 goto out;
1369
1370         regulator = create_regulator(rdev, dev, id);
1371         if (regulator == NULL) {
1372                 regulator = ERR_PTR(-ENOMEM);
1373                 module_put(rdev->owner);
1374                 goto out;
1375         }
1376
1377         rdev->open_count++;
1378         if (exclusive) {
1379                 rdev->exclusive = 1;
1380
1381                 ret = _regulator_is_enabled(rdev);
1382                 if (ret > 0)
1383                         rdev->use_count = 1;
1384                 else
1385                         rdev->use_count = 0;
1386         }
1387
1388 out:
1389         mutex_unlock(&regulator_list_mutex);
1390
1391         return regulator;
1392 }
1393
1394 /**
1395  * regulator_get - lookup and obtain a reference to a regulator.
1396  * @dev: device for regulator "consumer"
1397  * @id: Supply name or regulator ID.
1398  *
1399  * Returns a struct regulator corresponding to the regulator producer,
1400  * or IS_ERR() condition containing errno.
1401  *
1402  * Use of supply names configured via regulator_set_device_supply() is
1403  * strongly encouraged.  It is recommended that the supply name used
1404  * should match the name used for the supply and/or the relevant
1405  * device pins in the datasheet.
1406  */
1407 struct regulator *regulator_get(struct device *dev, const char *id)
1408 {
1409         return _regulator_get(dev, id, false, true);
1410 }
1411 EXPORT_SYMBOL_GPL(regulator_get);
1412
1413 /**
1414  * regulator_get_exclusive - obtain exclusive access to a regulator.
1415  * @dev: device for regulator "consumer"
1416  * @id: Supply name or regulator ID.
1417  *
1418  * Returns a struct regulator corresponding to the regulator producer,
1419  * or IS_ERR() condition containing errno.  Other consumers will be
1420  * unable to obtain this reference is held and the use count for the
1421  * regulator will be initialised to reflect the current state of the
1422  * regulator.
1423  *
1424  * This is intended for use by consumers which cannot tolerate shared
1425  * use of the regulator such as those which need to force the
1426  * regulator off for correct operation of the hardware they are
1427  * controlling.
1428  *
1429  * Use of supply names configured via regulator_set_device_supply() is
1430  * strongly encouraged.  It is recommended that the supply name used
1431  * should match the name used for the supply and/or the relevant
1432  * device pins in the datasheet.
1433  */
1434 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1435 {
1436         return _regulator_get(dev, id, true, false);
1437 }
1438 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1439
1440 /**
1441  * regulator_get_optional - obtain optional access to a regulator.
1442  * @dev: device for regulator "consumer"
1443  * @id: Supply name or regulator ID.
1444  *
1445  * Returns a struct regulator corresponding to the regulator producer,
1446  * or IS_ERR() condition containing errno.  Other consumers will be
1447  * unable to obtain this reference is held and the use count for the
1448  * regulator will be initialised to reflect the current state of the
1449  * regulator.
1450  *
1451  * This is intended for use by consumers for devices which can have
1452  * some supplies unconnected in normal use, such as some MMC devices.
1453  * It can allow the regulator core to provide stub supplies for other
1454  * supplies requested using normal regulator_get() calls without
1455  * disrupting the operation of drivers that can handle absent
1456  * supplies.
1457  *
1458  * Use of supply names configured via regulator_set_device_supply() is
1459  * strongly encouraged.  It is recommended that the supply name used
1460  * should match the name used for the supply and/or the relevant
1461  * device pins in the datasheet.
1462  */
1463 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1464 {
1465         return _regulator_get(dev, id, false, false);
1466 }
1467 EXPORT_SYMBOL_GPL(regulator_get_optional);
1468
1469 /* Locks held by regulator_put() */
1470 static void _regulator_put(struct regulator *regulator)
1471 {
1472         struct regulator_dev *rdev;
1473
1474         if (regulator == NULL || IS_ERR(regulator))
1475                 return;
1476
1477         rdev = regulator->rdev;
1478
1479         debugfs_remove_recursive(regulator->debugfs);
1480
1481         /* remove any sysfs entries */
1482         if (regulator->dev)
1483                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1484         kfree(regulator->supply_name);
1485         list_del(&regulator->list);
1486         kfree(regulator);
1487
1488         rdev->open_count--;
1489         rdev->exclusive = 0;
1490
1491         module_put(rdev->owner);
1492 }
1493
1494 /**
1495  * regulator_put - "free" the regulator source
1496  * @regulator: regulator source
1497  *
1498  * Note: drivers must ensure that all regulator_enable calls made on this
1499  * regulator source are balanced by regulator_disable calls prior to calling
1500  * this function.
1501  */
1502 void regulator_put(struct regulator *regulator)
1503 {
1504         mutex_lock(&regulator_list_mutex);
1505         _regulator_put(regulator);
1506         mutex_unlock(&regulator_list_mutex);
1507 }
1508 EXPORT_SYMBOL_GPL(regulator_put);
1509
1510 /**
1511  * regulator_register_supply_alias - Provide device alias for supply lookup
1512  *
1513  * @dev: device that will be given as the regulator "consumer"
1514  * @id: Supply name or regulator ID
1515  * @alias_dev: device that should be used to lookup the supply
1516  * @alias_id: Supply name or regulator ID that should be used to lookup the
1517  * supply
1518  *
1519  * All lookups for id on dev will instead be conducted for alias_id on
1520  * alias_dev.
1521  */
1522 int regulator_register_supply_alias(struct device *dev, const char *id,
1523                                     struct device *alias_dev,
1524                                     const char *alias_id)
1525 {
1526         struct regulator_supply_alias *map;
1527
1528         map = regulator_find_supply_alias(dev, id);
1529         if (map)
1530                 return -EEXIST;
1531
1532         map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1533         if (!map)
1534                 return -ENOMEM;
1535
1536         map->src_dev = dev;
1537         map->src_supply = id;
1538         map->alias_dev = alias_dev;
1539         map->alias_supply = alias_id;
1540
1541         list_add(&map->list, &regulator_supply_alias_list);
1542
1543         pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1544                 id, dev_name(dev), alias_id, dev_name(alias_dev));
1545
1546         return 0;
1547 }
1548 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1549
1550 /**
1551  * regulator_unregister_supply_alias - Remove device alias
1552  *
1553  * @dev: device that will be given as the regulator "consumer"
1554  * @id: Supply name or regulator ID
1555  *
1556  * Remove a lookup alias if one exists for id on dev.
1557  */
1558 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1559 {
1560         struct regulator_supply_alias *map;
1561
1562         map = regulator_find_supply_alias(dev, id);
1563         if (map) {
1564                 list_del(&map->list);
1565                 kfree(map);
1566         }
1567 }
1568 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1569
1570 /**
1571  * regulator_bulk_register_supply_alias - register multiple aliases
1572  *
1573  * @dev: device that will be given as the regulator "consumer"
1574  * @id: List of supply names or regulator IDs
1575  * @alias_dev: device that should be used to lookup the supply
1576  * @alias_id: List of supply names or regulator IDs that should be used to
1577  * lookup the supply
1578  * @num_id: Number of aliases to register
1579  *
1580  * @return 0 on success, an errno on failure.
1581  *
1582  * This helper function allows drivers to register several supply
1583  * aliases in one operation.  If any of the aliases cannot be
1584  * registered any aliases that were registered will be removed
1585  * before returning to the caller.
1586  */
1587 int regulator_bulk_register_supply_alias(struct device *dev, const char **id,
1588                                          struct device *alias_dev,
1589                                          const char **alias_id,
1590                                          int num_id)
1591 {
1592         int i;
1593         int ret;
1594
1595         for (i = 0; i < num_id; ++i) {
1596                 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1597                                                       alias_id[i]);
1598                 if (ret < 0)
1599                         goto err;
1600         }
1601
1602         return 0;
1603
1604 err:
1605         dev_err(dev,
1606                 "Failed to create supply alias %s,%s -> %s,%s\n",
1607                 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1608
1609         while (--i >= 0)
1610                 regulator_unregister_supply_alias(dev, id[i]);
1611
1612         return ret;
1613 }
1614 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1615
1616 /**
1617  * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1618  *
1619  * @dev: device that will be given as the regulator "consumer"
1620  * @id: List of supply names or regulator IDs
1621  * @num_id: Number of aliases to unregister
1622  *
1623  * This helper function allows drivers to unregister several supply
1624  * aliases in one operation.
1625  */
1626 void regulator_bulk_unregister_supply_alias(struct device *dev,
1627                                             const char **id,
1628                                             int num_id)
1629 {
1630         int i;
1631
1632         for (i = 0; i < num_id; ++i)
1633                 regulator_unregister_supply_alias(dev, id[i]);
1634 }
1635 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1636
1637
1638 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1639 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1640                                 const struct regulator_config *config)
1641 {
1642         struct regulator_enable_gpio *pin;
1643         int ret;
1644
1645         list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
1646                 if (pin->gpio == config->ena_gpio) {
1647                         rdev_dbg(rdev, "GPIO %d is already used\n",
1648                                 config->ena_gpio);
1649                         goto update_ena_gpio_to_rdev;
1650                 }
1651         }
1652
1653         ret = gpio_request_one(config->ena_gpio,
1654                                 GPIOF_DIR_OUT | config->ena_gpio_flags,
1655                                 rdev_get_name(rdev));
1656         if (ret)
1657                 return ret;
1658
1659         pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1660         if (pin == NULL) {
1661                 gpio_free(config->ena_gpio);
1662                 return -ENOMEM;
1663         }
1664
1665         pin->gpio = config->ena_gpio;
1666         pin->ena_gpio_invert = config->ena_gpio_invert;
1667         list_add(&pin->list, &regulator_ena_gpio_list);
1668
1669 update_ena_gpio_to_rdev:
1670         pin->request_count++;
1671         rdev->ena_pin = pin;
1672         return 0;
1673 }
1674
1675 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1676 {
1677         struct regulator_enable_gpio *pin, *n;
1678
1679         if (!rdev->ena_pin)
1680                 return;
1681
1682         /* Free the GPIO only in case of no use */
1683         list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
1684                 if (pin->gpio == rdev->ena_pin->gpio) {
1685                         if (pin->request_count <= 1) {
1686                                 pin->request_count = 0;
1687                                 gpio_free(pin->gpio);
1688                                 list_del(&pin->list);
1689                                 kfree(pin);
1690                         } else {
1691                                 pin->request_count--;
1692                         }
1693                 }
1694         }
1695 }
1696
1697 /**
1698  * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1699  * @rdev: regulator_dev structure
1700  * @enable: enable GPIO at initial use?
1701  *
1702  * GPIO is enabled in case of initial use. (enable_count is 0)
1703  * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1704  */
1705 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1706 {
1707         struct regulator_enable_gpio *pin = rdev->ena_pin;
1708
1709         if (!pin)
1710                 return -EINVAL;
1711
1712         if (enable) {
1713                 /* Enable GPIO at initial use */
1714                 if (pin->enable_count == 0)
1715                         gpio_set_value_cansleep(pin->gpio,
1716                                                 !pin->ena_gpio_invert);
1717
1718                 pin->enable_count++;
1719         } else {
1720                 if (pin->enable_count > 1) {
1721                         pin->enable_count--;
1722                         return 0;
1723                 }
1724
1725                 /* Disable GPIO if not used */
1726                 if (pin->enable_count <= 1) {
1727                         gpio_set_value_cansleep(pin->gpio,
1728                                                 pin->ena_gpio_invert);
1729                         pin->enable_count = 0;
1730                 }
1731         }
1732
1733         return 0;
1734 }
1735
1736 static int _regulator_do_enable(struct regulator_dev *rdev)
1737 {
1738         int ret, delay;
1739
1740         /* Query before enabling in case configuration dependent.  */
1741         ret = _regulator_get_enable_time(rdev);
1742         if (ret >= 0) {
1743                 delay = ret;
1744         } else {
1745                 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1746                 delay = 0;
1747         }
1748
1749         trace_regulator_enable(rdev_get_name(rdev));
1750
1751         if (rdev->ena_pin) {
1752                 ret = regulator_ena_gpio_ctrl(rdev, true);
1753                 if (ret < 0)
1754                         return ret;
1755                 rdev->ena_gpio_state = 1;
1756         } else if (rdev->desc->ops->enable) {
1757                 ret = rdev->desc->ops->enable(rdev);
1758                 if (ret < 0)
1759                         return ret;
1760         } else {
1761                 return -EINVAL;
1762         }
1763
1764         /* Allow the regulator to ramp; it would be useful to extend
1765          * this for bulk operations so that the regulators can ramp
1766          * together.  */
1767         trace_regulator_enable_delay(rdev_get_name(rdev));
1768
1769         /*
1770          * Delay for the requested amount of time as per the guidelines in:
1771          *
1772          *     Documentation/timers/timers-howto.txt
1773          *
1774          * The assumption here is that regulators will never be enabled in
1775          * atomic context and therefore sleeping functions can be used.
1776          */
1777         if (delay) {
1778                 unsigned int ms = delay / 1000;
1779                 unsigned int us = delay % 1000;
1780
1781                 if (ms > 0) {
1782                         /*
1783                          * For small enough values, handle super-millisecond
1784                          * delays in the usleep_range() call below.
1785                          */
1786                         if (ms < 20)
1787                                 us += ms * 1000;
1788                         else
1789                                 msleep(ms);
1790                 }
1791
1792                 /*
1793                  * Give the scheduler some room to coalesce with any other
1794                  * wakeup sources. For delays shorter than 10 us, don't even
1795                  * bother setting up high-resolution timers and just busy-
1796                  * loop.
1797                  */
1798                 if (us >= 10)
1799                         usleep_range(us, us + 100);
1800                 else
1801                         udelay(us);
1802         }
1803
1804         trace_regulator_enable_complete(rdev_get_name(rdev));
1805
1806         return 0;
1807 }
1808
1809 /* locks held by regulator_enable() */
1810 static int _regulator_enable(struct regulator_dev *rdev)
1811 {
1812         int ret;
1813
1814         /* check voltage and requested load before enabling */
1815         if (rdev->constraints &&
1816             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1817                 drms_uA_update(rdev);
1818
1819         if (rdev->use_count == 0) {
1820                 /* The regulator may on if it's not switchable or left on */
1821                 ret = _regulator_is_enabled(rdev);
1822                 if (ret == -EINVAL || ret == 0) {
1823                         if (!_regulator_can_change_status(rdev))
1824                                 return -EPERM;
1825
1826                         ret = _regulator_do_enable(rdev);
1827                         if (ret < 0)
1828                                 return ret;
1829
1830                 } else if (ret < 0) {
1831                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1832                         return ret;
1833                 }
1834                 /* Fallthrough on positive return values - already enabled */
1835         }
1836
1837         rdev->use_count++;
1838
1839         return 0;
1840 }
1841
1842 /**
1843  * regulator_enable - enable regulator output
1844  * @regulator: regulator source
1845  *
1846  * Request that the regulator be enabled with the regulator output at
1847  * the predefined voltage or current value.  Calls to regulator_enable()
1848  * must be balanced with calls to regulator_disable().
1849  *
1850  * NOTE: the output value can be set by other drivers, boot loader or may be
1851  * hardwired in the regulator.
1852  */
1853 int regulator_enable(struct regulator *regulator)
1854 {
1855         struct regulator_dev *rdev = regulator->rdev;
1856         int ret = 0;
1857
1858         if (regulator->always_on)
1859                 return 0;
1860
1861         if (rdev->supply) {
1862                 ret = regulator_enable(rdev->supply);
1863                 if (ret != 0)
1864                         return ret;
1865         }
1866
1867         mutex_lock(&rdev->mutex);
1868         ret = _regulator_enable(rdev);
1869         mutex_unlock(&rdev->mutex);
1870
1871         if (ret != 0 && rdev->supply)
1872                 regulator_disable(rdev->supply);
1873
1874         return ret;
1875 }
1876 EXPORT_SYMBOL_GPL(regulator_enable);
1877
1878 static int _regulator_do_disable(struct regulator_dev *rdev)
1879 {
1880         int ret;
1881
1882         trace_regulator_disable(rdev_get_name(rdev));
1883
1884         if (rdev->ena_pin) {
1885                 ret = regulator_ena_gpio_ctrl(rdev, false);
1886                 if (ret < 0)
1887                         return ret;
1888                 rdev->ena_gpio_state = 0;
1889
1890         } else if (rdev->desc->ops->disable) {
1891                 ret = rdev->desc->ops->disable(rdev);
1892                 if (ret != 0)
1893                         return ret;
1894         }
1895
1896         trace_regulator_disable_complete(rdev_get_name(rdev));
1897
1898         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1899                              NULL);
1900         return 0;
1901 }
1902
1903 /* locks held by regulator_disable() */
1904 static int _regulator_disable(struct regulator_dev *rdev)
1905 {
1906         int ret = 0;
1907
1908         if (WARN(rdev->use_count <= 0,
1909                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
1910                 return -EIO;
1911
1912         /* are we the last user and permitted to disable ? */
1913         if (rdev->use_count == 1 &&
1914             (rdev->constraints && !rdev->constraints->always_on)) {
1915
1916                 /* we are last user */
1917                 if (_regulator_can_change_status(rdev)) {
1918                         ret = _regulator_do_disable(rdev);
1919                         if (ret < 0) {
1920                                 rdev_err(rdev, "failed to disable\n");
1921                                 return ret;
1922                         }
1923                 }
1924
1925                 rdev->use_count = 0;
1926         } else if (rdev->use_count > 1) {
1927
1928                 if (rdev->constraints &&
1929                         (rdev->constraints->valid_ops_mask &
1930                         REGULATOR_CHANGE_DRMS))
1931                         drms_uA_update(rdev);
1932
1933                 rdev->use_count--;
1934         }
1935
1936         return ret;
1937 }
1938
1939 /**
1940  * regulator_disable - disable regulator output
1941  * @regulator: regulator source
1942  *
1943  * Disable the regulator output voltage or current.  Calls to
1944  * regulator_enable() must be balanced with calls to
1945  * regulator_disable().
1946  *
1947  * NOTE: this will only disable the regulator output if no other consumer
1948  * devices have it enabled, the regulator device supports disabling and
1949  * machine constraints permit this operation.
1950  */
1951 int regulator_disable(struct regulator *regulator)
1952 {
1953         struct regulator_dev *rdev = regulator->rdev;
1954         int ret = 0;
1955
1956         if (regulator->always_on)
1957                 return 0;
1958
1959         mutex_lock(&rdev->mutex);
1960         ret = _regulator_disable(rdev);
1961         mutex_unlock(&rdev->mutex);
1962
1963         if (ret == 0 && rdev->supply)
1964                 regulator_disable(rdev->supply);
1965
1966         return ret;
1967 }
1968 EXPORT_SYMBOL_GPL(regulator_disable);
1969
1970 /* locks held by regulator_force_disable() */
1971 static int _regulator_force_disable(struct regulator_dev *rdev)
1972 {
1973         int ret = 0;
1974
1975         /* force disable */
1976         if (rdev->desc->ops->disable) {
1977                 /* ah well, who wants to live forever... */
1978                 ret = rdev->desc->ops->disable(rdev);
1979                 if (ret < 0) {
1980                         rdev_err(rdev, "failed to force disable\n");
1981                         return ret;
1982                 }
1983                 /* notify other consumers that power has been forced off */
1984                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1985                         REGULATOR_EVENT_DISABLE, NULL);
1986         }
1987
1988         return ret;
1989 }
1990
1991 /**
1992  * regulator_force_disable - force disable regulator output
1993  * @regulator: regulator source
1994  *
1995  * Forcibly disable the regulator output voltage or current.
1996  * NOTE: this *will* disable the regulator output even if other consumer
1997  * devices have it enabled. This should be used for situations when device
1998  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1999  */
2000 int regulator_force_disable(struct regulator *regulator)
2001 {
2002         struct regulator_dev *rdev = regulator->rdev;
2003         int ret;
2004
2005         mutex_lock(&rdev->mutex);
2006         regulator->uA_load = 0;
2007         ret = _regulator_force_disable(regulator->rdev);
2008         mutex_unlock(&rdev->mutex);
2009
2010         if (rdev->supply)
2011                 while (rdev->open_count--)
2012                         regulator_disable(rdev->supply);
2013
2014         return ret;
2015 }
2016 EXPORT_SYMBOL_GPL(regulator_force_disable);
2017
2018 static void regulator_disable_work(struct work_struct *work)
2019 {
2020         struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2021                                                   disable_work.work);
2022         int count, i, ret;
2023
2024         mutex_lock(&rdev->mutex);
2025
2026         BUG_ON(!rdev->deferred_disables);
2027
2028         count = rdev->deferred_disables;
2029         rdev->deferred_disables = 0;
2030
2031         for (i = 0; i < count; i++) {
2032                 ret = _regulator_disable(rdev);
2033                 if (ret != 0)
2034                         rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2035         }
2036
2037         mutex_unlock(&rdev->mutex);
2038
2039         if (rdev->supply) {
2040                 for (i = 0; i < count; i++) {
2041                         ret = regulator_disable(rdev->supply);
2042                         if (ret != 0) {
2043                                 rdev_err(rdev,
2044                                          "Supply disable failed: %d\n", ret);
2045                         }
2046                 }
2047         }
2048 }
2049
2050 /**
2051  * regulator_disable_deferred - disable regulator output with delay
2052  * @regulator: regulator source
2053  * @ms: miliseconds until the regulator is disabled
2054  *
2055  * Execute regulator_disable() on the regulator after a delay.  This
2056  * is intended for use with devices that require some time to quiesce.
2057  *
2058  * NOTE: this will only disable the regulator output if no other consumer
2059  * devices have it enabled, the regulator device supports disabling and
2060  * machine constraints permit this operation.
2061  */
2062 int regulator_disable_deferred(struct regulator *regulator, int ms)
2063 {
2064         struct regulator_dev *rdev = regulator->rdev;
2065         int ret;
2066
2067         if (regulator->always_on)
2068                 return 0;
2069
2070         if (!ms)
2071                 return regulator_disable(regulator);
2072
2073         mutex_lock(&rdev->mutex);
2074         rdev->deferred_disables++;
2075         mutex_unlock(&rdev->mutex);
2076
2077         ret = queue_delayed_work(system_power_efficient_wq,
2078                                  &rdev->disable_work,
2079                                  msecs_to_jiffies(ms));
2080         if (ret < 0)
2081                 return ret;
2082         else
2083                 return 0;
2084 }
2085 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2086
2087 static int _regulator_is_enabled(struct regulator_dev *rdev)
2088 {
2089         /* A GPIO control always takes precedence */
2090         if (rdev->ena_pin)
2091                 return rdev->ena_gpio_state;
2092
2093         /* If we don't know then assume that the regulator is always on */
2094         if (!rdev->desc->ops->is_enabled)
2095                 return 1;
2096
2097         return rdev->desc->ops->is_enabled(rdev);
2098 }
2099
2100 /**
2101  * regulator_is_enabled - is the regulator output enabled
2102  * @regulator: regulator source
2103  *
2104  * Returns positive if the regulator driver backing the source/client
2105  * has requested that the device be enabled, zero if it hasn't, else a
2106  * negative errno code.
2107  *
2108  * Note that the device backing this regulator handle can have multiple
2109  * users, so it might be enabled even if regulator_enable() was never
2110  * called for this particular source.
2111  */
2112 int regulator_is_enabled(struct regulator *regulator)
2113 {
2114         int ret;
2115
2116         if (regulator->always_on)
2117                 return 1;
2118
2119         mutex_lock(&regulator->rdev->mutex);
2120         ret = _regulator_is_enabled(regulator->rdev);
2121         mutex_unlock(&regulator->rdev->mutex);
2122
2123         return ret;
2124 }
2125 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2126
2127 /**
2128  * regulator_can_change_voltage - check if regulator can change voltage
2129  * @regulator: regulator source
2130  *
2131  * Returns positive if the regulator driver backing the source/client
2132  * can change its voltage, false otherwise. Usefull for detecting fixed
2133  * or dummy regulators and disabling voltage change logic in the client
2134  * driver.
2135  */
2136 int regulator_can_change_voltage(struct regulator *regulator)
2137 {
2138         struct regulator_dev    *rdev = regulator->rdev;
2139
2140         if (rdev->constraints &&
2141             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2142                 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2143                         return 1;
2144
2145                 if (rdev->desc->continuous_voltage_range &&
2146                     rdev->constraints->min_uV && rdev->constraints->max_uV &&
2147                     rdev->constraints->min_uV != rdev->constraints->max_uV)
2148                         return 1;
2149         }
2150
2151         return 0;
2152 }
2153 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2154
2155 /**
2156  * regulator_count_voltages - count regulator_list_voltage() selectors
2157  * @regulator: regulator source
2158  *
2159  * Returns number of selectors, or negative errno.  Selectors are
2160  * numbered starting at zero, and typically correspond to bitfields
2161  * in hardware registers.
2162  */
2163 int regulator_count_voltages(struct regulator *regulator)
2164 {
2165         struct regulator_dev    *rdev = regulator->rdev;
2166
2167         return rdev->desc->n_voltages ? : -EINVAL;
2168 }
2169 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2170
2171 /**
2172  * regulator_list_voltage - enumerate supported voltages
2173  * @regulator: regulator source
2174  * @selector: identify voltage to list
2175  * Context: can sleep
2176  *
2177  * Returns a voltage that can be passed to @regulator_set_voltage(),
2178  * zero if this selector code can't be used on this system, or a
2179  * negative errno.
2180  */
2181 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2182 {
2183         struct regulator_dev    *rdev = regulator->rdev;
2184         struct regulator_ops    *ops = rdev->desc->ops;
2185         int                     ret;
2186
2187         if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2188                 return rdev->desc->fixed_uV;
2189
2190         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2191                 return -EINVAL;
2192
2193         mutex_lock(&rdev->mutex);
2194         ret = ops->list_voltage(rdev, selector);
2195         mutex_unlock(&rdev->mutex);
2196
2197         if (ret > 0) {
2198                 if (ret < rdev->constraints->min_uV)
2199                         ret = 0;
2200                 else if (ret > rdev->constraints->max_uV)
2201                         ret = 0;
2202         }
2203
2204         return ret;
2205 }
2206 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2207
2208 /**
2209  * regulator_get_linear_step - return the voltage step size between VSEL values
2210  * @regulator: regulator source
2211  *
2212  * Returns the voltage step size between VSEL values for linear
2213  * regulators, or return 0 if the regulator isn't a linear regulator.
2214  */
2215 unsigned int regulator_get_linear_step(struct regulator *regulator)
2216 {
2217         struct regulator_dev *rdev = regulator->rdev;
2218
2219         return rdev->desc->uV_step;
2220 }
2221 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2222
2223 /**
2224  * regulator_is_supported_voltage - check if a voltage range can be supported
2225  *
2226  * @regulator: Regulator to check.
2227  * @min_uV: Minimum required voltage in uV.
2228  * @max_uV: Maximum required voltage in uV.
2229  *
2230  * Returns a boolean or a negative error code.
2231  */
2232 int regulator_is_supported_voltage(struct regulator *regulator,
2233                                    int min_uV, int max_uV)
2234 {
2235         struct regulator_dev *rdev = regulator->rdev;
2236         int i, voltages, ret;
2237
2238         /* If we can't change voltage check the current voltage */
2239         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2240                 ret = regulator_get_voltage(regulator);
2241                 if (ret >= 0)
2242                         return (min_uV <= ret && ret <= max_uV);
2243                 else
2244                         return ret;
2245         }
2246
2247         /* Any voltage within constrains range is fine? */
2248         if (rdev->desc->continuous_voltage_range)
2249                 return min_uV >= rdev->constraints->min_uV &&
2250                                 max_uV <= rdev->constraints->max_uV;
2251
2252         ret = regulator_count_voltages(regulator);
2253         if (ret < 0)
2254                 return ret;
2255         voltages = ret;
2256
2257         for (i = 0; i < voltages; i++) {
2258                 ret = regulator_list_voltage(regulator, i);
2259
2260                 if (ret >= min_uV && ret <= max_uV)
2261                         return 1;
2262         }
2263
2264         return 0;
2265 }
2266 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2267
2268 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2269                                      int min_uV, int max_uV)
2270 {
2271         int ret;
2272         int delay = 0;
2273         int best_val = 0;
2274         unsigned int selector;
2275         int old_selector = -1;
2276
2277         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2278
2279         min_uV += rdev->constraints->uV_offset;
2280         max_uV += rdev->constraints->uV_offset;
2281
2282         /*
2283          * If we can't obtain the old selector there is not enough
2284          * info to call set_voltage_time_sel().
2285          */
2286         if (_regulator_is_enabled(rdev) &&
2287             rdev->desc->ops->set_voltage_time_sel &&
2288             rdev->desc->ops->get_voltage_sel) {
2289                 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2290                 if (old_selector < 0)
2291                         return old_selector;
2292         }
2293
2294         if (rdev->desc->ops->set_voltage) {
2295                 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2296                                                    &selector);
2297
2298                 if (ret >= 0) {
2299                         if (rdev->desc->ops->list_voltage)
2300                                 best_val = rdev->desc->ops->list_voltage(rdev,
2301                                                                          selector);
2302                         else
2303                                 best_val = _regulator_get_voltage(rdev);
2304                 }
2305
2306         } else if (rdev->desc->ops->set_voltage_sel) {
2307                 if (rdev->desc->ops->map_voltage) {
2308                         ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2309                                                            max_uV);
2310                 } else {
2311                         if (rdev->desc->ops->list_voltage ==
2312                             regulator_list_voltage_linear)
2313                                 ret = regulator_map_voltage_linear(rdev,
2314                                                                 min_uV, max_uV);
2315                         else
2316                                 ret = regulator_map_voltage_iterate(rdev,
2317                                                                 min_uV, max_uV);
2318                 }
2319
2320                 if (ret >= 0) {
2321                         best_val = rdev->desc->ops->list_voltage(rdev, ret);
2322                         if (min_uV <= best_val && max_uV >= best_val) {
2323                                 selector = ret;
2324                                 if (old_selector == selector)
2325                                         ret = 0;
2326                                 else
2327                                         ret = rdev->desc->ops->set_voltage_sel(
2328                                                                 rdev, ret);
2329                         } else {
2330                                 ret = -EINVAL;
2331                         }
2332                 }
2333         } else {
2334                 ret = -EINVAL;
2335         }
2336
2337         /* Call set_voltage_time_sel if successfully obtained old_selector */
2338         if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2339                 && old_selector != selector) {
2340
2341                 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2342                                                 old_selector, selector);
2343                 if (delay < 0) {
2344                         rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2345                                   delay);
2346                         delay = 0;
2347                 }
2348
2349                 /* Insert any necessary delays */
2350                 if (delay >= 1000) {
2351                         mdelay(delay / 1000);
2352                         udelay(delay % 1000);
2353                 } else if (delay) {
2354                         udelay(delay);
2355                 }
2356         }
2357
2358         if (ret == 0 && best_val >= 0) {
2359                 unsigned long data = best_val;
2360
2361                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2362                                      (void *)data);
2363         }
2364
2365         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2366
2367         return ret;
2368 }
2369
2370 /**
2371  * regulator_set_voltage - set regulator output voltage
2372  * @regulator: regulator source
2373  * @min_uV: Minimum required voltage in uV
2374  * @max_uV: Maximum acceptable voltage in uV
2375  *
2376  * Sets a voltage regulator to the desired output voltage. This can be set
2377  * during any regulator state. IOW, regulator can be disabled or enabled.
2378  *
2379  * If the regulator is enabled then the voltage will change to the new value
2380  * immediately otherwise if the regulator is disabled the regulator will
2381  * output at the new voltage when enabled.
2382  *
2383  * NOTE: If the regulator is shared between several devices then the lowest
2384  * request voltage that meets the system constraints will be used.
2385  * Regulator system constraints must be set for this regulator before
2386  * calling this function otherwise this call will fail.
2387  */
2388 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2389 {
2390         struct regulator_dev *rdev = regulator->rdev;
2391         int ret = 0;
2392         int old_min_uV, old_max_uV;
2393
2394         mutex_lock(&rdev->mutex);
2395
2396         /* If we're setting the same range as last time the change
2397          * should be a noop (some cpufreq implementations use the same
2398          * voltage for multiple frequencies, for example).
2399          */
2400         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2401                 goto out;
2402
2403         /* sanity check */
2404         if (!rdev->desc->ops->set_voltage &&
2405             !rdev->desc->ops->set_voltage_sel) {
2406                 ret = -EINVAL;
2407                 goto out;
2408         }
2409
2410         /* constraints check */
2411         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2412         if (ret < 0)
2413                 goto out;
2414
2415         /* restore original values in case of error */
2416         old_min_uV = regulator->min_uV;
2417         old_max_uV = regulator->max_uV;
2418         regulator->min_uV = min_uV;
2419         regulator->max_uV = max_uV;
2420
2421         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2422         if (ret < 0)
2423                 goto out2;
2424
2425         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2426         if (ret < 0)
2427                 goto out2;
2428
2429 out:
2430         mutex_unlock(&rdev->mutex);
2431         return ret;
2432 out2:
2433         regulator->min_uV = old_min_uV;
2434         regulator->max_uV = old_max_uV;
2435         mutex_unlock(&rdev->mutex);
2436         return ret;
2437 }
2438 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2439
2440 /**
2441  * regulator_set_voltage_time - get raise/fall time
2442  * @regulator: regulator source
2443  * @old_uV: starting voltage in microvolts
2444  * @new_uV: target voltage in microvolts
2445  *
2446  * Provided with the starting and ending voltage, this function attempts to
2447  * calculate the time in microseconds required to rise or fall to this new
2448  * voltage.
2449  */
2450 int regulator_set_voltage_time(struct regulator *regulator,
2451                                int old_uV, int new_uV)
2452 {
2453         struct regulator_dev    *rdev = regulator->rdev;
2454         struct regulator_ops    *ops = rdev->desc->ops;
2455         int old_sel = -1;
2456         int new_sel = -1;
2457         int voltage;
2458         int i;
2459
2460         /* Currently requires operations to do this */
2461         if (!ops->list_voltage || !ops->set_voltage_time_sel
2462             || !rdev->desc->n_voltages)
2463                 return -EINVAL;
2464
2465         for (i = 0; i < rdev->desc->n_voltages; i++) {
2466                 /* We only look for exact voltage matches here */
2467                 voltage = regulator_list_voltage(regulator, i);
2468                 if (voltage < 0)
2469                         return -EINVAL;
2470                 if (voltage == 0)
2471                         continue;
2472                 if (voltage == old_uV)
2473                         old_sel = i;
2474                 if (voltage == new_uV)
2475                         new_sel = i;
2476         }
2477
2478         if (old_sel < 0 || new_sel < 0)
2479                 return -EINVAL;
2480
2481         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2482 }
2483 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2484
2485 /**
2486  * regulator_set_voltage_time_sel - get raise/fall time
2487  * @rdev: regulator source device
2488  * @old_selector: selector for starting voltage
2489  * @new_selector: selector for target voltage
2490  *
2491  * Provided with the starting and target voltage selectors, this function
2492  * returns time in microseconds required to rise or fall to this new voltage
2493  *
2494  * Drivers providing ramp_delay in regulation_constraints can use this as their
2495  * set_voltage_time_sel() operation.
2496  */
2497 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2498                                    unsigned int old_selector,
2499                                    unsigned int new_selector)
2500 {
2501         unsigned int ramp_delay = 0;
2502         int old_volt, new_volt;
2503
2504         if (rdev->constraints->ramp_delay)
2505                 ramp_delay = rdev->constraints->ramp_delay;
2506         else if (rdev->desc->ramp_delay)
2507                 ramp_delay = rdev->desc->ramp_delay;
2508
2509         if (ramp_delay == 0) {
2510                 rdev_warn(rdev, "ramp_delay not set\n");
2511                 return 0;
2512         }
2513
2514         /* sanity check */
2515         if (!rdev->desc->ops->list_voltage)
2516                 return -EINVAL;
2517
2518         old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2519         new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2520
2521         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2522 }
2523 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2524
2525 /**
2526  * regulator_sync_voltage - re-apply last regulator output voltage
2527  * @regulator: regulator source
2528  *
2529  * Re-apply the last configured voltage.  This is intended to be used
2530  * where some external control source the consumer is cooperating with
2531  * has caused the configured voltage to change.
2532  */
2533 int regulator_sync_voltage(struct regulator *regulator)
2534 {
2535         struct regulator_dev *rdev = regulator->rdev;
2536         int ret, min_uV, max_uV;
2537
2538         mutex_lock(&rdev->mutex);
2539
2540         if (!rdev->desc->ops->set_voltage &&
2541             !rdev->desc->ops->set_voltage_sel) {
2542                 ret = -EINVAL;
2543                 goto out;
2544         }
2545
2546         /* This is only going to work if we've had a voltage configured. */
2547         if (!regulator->min_uV && !regulator->max_uV) {
2548                 ret = -EINVAL;
2549                 goto out;
2550         }
2551
2552         min_uV = regulator->min_uV;
2553         max_uV = regulator->max_uV;
2554
2555         /* This should be a paranoia check... */
2556         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2557         if (ret < 0)
2558                 goto out;
2559
2560         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2561         if (ret < 0)
2562                 goto out;
2563
2564         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2565
2566 out:
2567         mutex_unlock(&rdev->mutex);
2568         return ret;
2569 }
2570 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2571
2572 static int _regulator_get_voltage(struct regulator_dev *rdev)
2573 {
2574         int sel, ret;
2575
2576         if (rdev->desc->ops->get_voltage_sel) {
2577                 sel = rdev->desc->ops->get_voltage_sel(rdev);
2578                 if (sel < 0)
2579                         return sel;
2580                 ret = rdev->desc->ops->list_voltage(rdev, sel);
2581         } else if (rdev->desc->ops->get_voltage) {
2582                 ret = rdev->desc->ops->get_voltage(rdev);
2583         } else if (rdev->desc->ops->list_voltage) {
2584                 ret = rdev->desc->ops->list_voltage(rdev, 0);
2585         } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2586                 ret = rdev->desc->fixed_uV;
2587         } else {
2588                 return -EINVAL;
2589         }
2590
2591         if (ret < 0)
2592                 return ret;
2593         return ret - rdev->constraints->uV_offset;
2594 }
2595
2596 /**
2597  * regulator_get_voltage - get regulator output voltage
2598  * @regulator: regulator source
2599  *
2600  * This returns the current regulator voltage in uV.
2601  *
2602  * NOTE: If the regulator is disabled it will return the voltage value. This
2603  * function should not be used to determine regulator state.
2604  */
2605 int regulator_get_voltage(struct regulator *regulator)
2606 {
2607         int ret;
2608
2609         mutex_lock(&regulator->rdev->mutex);
2610
2611         ret = _regulator_get_voltage(regulator->rdev);
2612
2613         mutex_unlock(&regulator->rdev->mutex);
2614
2615         return ret;
2616 }
2617 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2618
2619 /**
2620  * regulator_set_current_limit - set regulator output current limit
2621  * @regulator: regulator source
2622  * @min_uA: Minimum supported current in uA
2623  * @max_uA: Maximum supported current in uA
2624  *
2625  * Sets current sink to the desired output current. This can be set during
2626  * any regulator state. IOW, regulator can be disabled or enabled.
2627  *
2628  * If the regulator is enabled then the current will change to the new value
2629  * immediately otherwise if the regulator is disabled the regulator will
2630  * output at the new current when enabled.
2631  *
2632  * NOTE: Regulator system constraints must be set for this regulator before
2633  * calling this function otherwise this call will fail.
2634  */
2635 int regulator_set_current_limit(struct regulator *regulator,
2636                                int min_uA, int max_uA)
2637 {
2638         struct regulator_dev *rdev = regulator->rdev;
2639         int ret;
2640
2641         mutex_lock(&rdev->mutex);
2642
2643         /* sanity check */
2644         if (!rdev->desc->ops->set_current_limit) {
2645                 ret = -EINVAL;
2646                 goto out;
2647         }
2648
2649         /* constraints check */
2650         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2651         if (ret < 0)
2652                 goto out;
2653
2654         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2655 out:
2656         mutex_unlock(&rdev->mutex);
2657         return ret;
2658 }
2659 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2660
2661 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2662 {
2663         int ret;
2664
2665         mutex_lock(&rdev->mutex);
2666
2667         /* sanity check */
2668         if (!rdev->desc->ops->get_current_limit) {
2669                 ret = -EINVAL;
2670                 goto out;
2671         }
2672
2673         ret = rdev->desc->ops->get_current_limit(rdev);
2674 out:
2675         mutex_unlock(&rdev->mutex);
2676         return ret;
2677 }
2678
2679 /**
2680  * regulator_get_current_limit - get regulator output current
2681  * @regulator: regulator source
2682  *
2683  * This returns the current supplied by the specified current sink in uA.
2684  *
2685  * NOTE: If the regulator is disabled it will return the current value. This
2686  * function should not be used to determine regulator state.
2687  */
2688 int regulator_get_current_limit(struct regulator *regulator)
2689 {
2690         return _regulator_get_current_limit(regulator->rdev);
2691 }
2692 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2693
2694 /**
2695  * regulator_set_mode - set regulator operating mode
2696  * @regulator: regulator source
2697  * @mode: operating mode - one of the REGULATOR_MODE constants
2698  *
2699  * Set regulator operating mode to increase regulator efficiency or improve
2700  * regulation performance.
2701  *
2702  * NOTE: Regulator system constraints must be set for this regulator before
2703  * calling this function otherwise this call will fail.
2704  */
2705 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2706 {
2707         struct regulator_dev *rdev = regulator->rdev;
2708         int ret;
2709         int regulator_curr_mode;
2710
2711         mutex_lock(&rdev->mutex);
2712
2713         /* sanity check */
2714         if (!rdev->desc->ops->set_mode) {
2715                 ret = -EINVAL;
2716                 goto out;
2717         }
2718
2719         /* return if the same mode is requested */
2720         if (rdev->desc->ops->get_mode) {
2721                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2722                 if (regulator_curr_mode == mode) {
2723                         ret = 0;
2724                         goto out;
2725                 }
2726         }
2727
2728         /* constraints check */
2729         ret = regulator_mode_constrain(rdev, &mode);
2730         if (ret < 0)
2731                 goto out;
2732
2733         ret = rdev->desc->ops->set_mode(rdev, mode);
2734 out:
2735         mutex_unlock(&rdev->mutex);
2736         return ret;
2737 }
2738 EXPORT_SYMBOL_GPL(regulator_set_mode);
2739
2740 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2741 {
2742         int ret;
2743
2744         mutex_lock(&rdev->mutex);
2745
2746         /* sanity check */
2747         if (!rdev->desc->ops->get_mode) {
2748                 ret = -EINVAL;
2749                 goto out;
2750         }
2751
2752         ret = rdev->desc->ops->get_mode(rdev);
2753 out:
2754         mutex_unlock(&rdev->mutex);
2755         return ret;
2756 }
2757
2758 /**
2759  * regulator_get_mode - get regulator operating mode
2760  * @regulator: regulator source
2761  *
2762  * Get the current regulator operating mode.
2763  */
2764 unsigned int regulator_get_mode(struct regulator *regulator)
2765 {
2766         return _regulator_get_mode(regulator->rdev);
2767 }
2768 EXPORT_SYMBOL_GPL(regulator_get_mode);
2769
2770 /**
2771  * regulator_set_optimum_mode - set regulator optimum operating mode
2772  * @regulator: regulator source
2773  * @uA_load: load current
2774  *
2775  * Notifies the regulator core of a new device load. This is then used by
2776  * DRMS (if enabled by constraints) to set the most efficient regulator
2777  * operating mode for the new regulator loading.
2778  *
2779  * Consumer devices notify their supply regulator of the maximum power
2780  * they will require (can be taken from device datasheet in the power
2781  * consumption tables) when they change operational status and hence power
2782  * state. Examples of operational state changes that can affect power
2783  * consumption are :-
2784  *
2785  *    o Device is opened / closed.
2786  *    o Device I/O is about to begin or has just finished.
2787  *    o Device is idling in between work.
2788  *
2789  * This information is also exported via sysfs to userspace.
2790  *
2791  * DRMS will sum the total requested load on the regulator and change
2792  * to the most efficient operating mode if platform constraints allow.
2793  *
2794  * Returns the new regulator mode or error.
2795  */
2796 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2797 {
2798         struct regulator_dev *rdev = regulator->rdev;
2799         struct regulator *consumer;
2800         int ret, output_uV, input_uV = 0, total_uA_load = 0;
2801         unsigned int mode;
2802
2803         if (rdev->supply)
2804                 input_uV = regulator_get_voltage(rdev->supply);
2805
2806         mutex_lock(&rdev->mutex);
2807
2808         /*
2809          * first check to see if we can set modes at all, otherwise just
2810          * tell the consumer everything is OK.
2811          */
2812         regulator->uA_load = uA_load;
2813         ret = regulator_check_drms(rdev);
2814         if (ret < 0) {
2815                 ret = 0;
2816                 goto out;
2817         }
2818
2819         if (!rdev->desc->ops->get_optimum_mode)
2820                 goto out;
2821
2822         /*
2823          * we can actually do this so any errors are indicators of
2824          * potential real failure.
2825          */
2826         ret = -EINVAL;
2827
2828         if (!rdev->desc->ops->set_mode)
2829                 goto out;
2830
2831         /* get output voltage */
2832         output_uV = _regulator_get_voltage(rdev);
2833         if (output_uV <= 0) {
2834                 rdev_err(rdev, "invalid output voltage found\n");
2835                 goto out;
2836         }
2837
2838         /* No supply? Use constraint voltage */
2839         if (input_uV <= 0)
2840                 input_uV = rdev->constraints->input_uV;
2841         if (input_uV <= 0) {
2842                 rdev_err(rdev, "invalid input voltage found\n");
2843                 goto out;
2844         }
2845
2846         /* calc total requested load for this regulator */
2847         list_for_each_entry(consumer, &rdev->consumer_list, list)
2848                 total_uA_load += consumer->uA_load;
2849
2850         mode = rdev->desc->ops->get_optimum_mode(rdev,
2851                                                  input_uV, output_uV,
2852                                                  total_uA_load);
2853         ret = regulator_mode_constrain(rdev, &mode);
2854         if (ret < 0) {
2855                 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2856                          total_uA_load, input_uV, output_uV);
2857                 goto out;
2858         }
2859
2860         ret = rdev->desc->ops->set_mode(rdev, mode);
2861         if (ret < 0) {
2862                 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2863                 goto out;
2864         }
2865         ret = mode;
2866 out:
2867         mutex_unlock(&rdev->mutex);
2868         return ret;
2869 }
2870 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2871
2872 /**
2873  * regulator_allow_bypass - allow the regulator to go into bypass mode
2874  *
2875  * @regulator: Regulator to configure
2876  * @enable: enable or disable bypass mode
2877  *
2878  * Allow the regulator to go into bypass mode if all other consumers
2879  * for the regulator also enable bypass mode and the machine
2880  * constraints allow this.  Bypass mode means that the regulator is
2881  * simply passing the input directly to the output with no regulation.
2882  */
2883 int regulator_allow_bypass(struct regulator *regulator, bool enable)
2884 {
2885         struct regulator_dev *rdev = regulator->rdev;
2886         int ret = 0;
2887
2888         if (!rdev->desc->ops->set_bypass)
2889                 return 0;
2890
2891         if (rdev->constraints &&
2892             !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2893                 return 0;
2894
2895         mutex_lock(&rdev->mutex);
2896
2897         if (enable && !regulator->bypass) {
2898                 rdev->bypass_count++;
2899
2900                 if (rdev->bypass_count == rdev->open_count) {
2901                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2902                         if (ret != 0)
2903                                 rdev->bypass_count--;
2904                 }
2905
2906         } else if (!enable && regulator->bypass) {
2907                 rdev->bypass_count--;
2908
2909                 if (rdev->bypass_count != rdev->open_count) {
2910                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2911                         if (ret != 0)
2912                                 rdev->bypass_count++;
2913                 }
2914         }
2915
2916         if (ret == 0)
2917                 regulator->bypass = enable;
2918
2919         mutex_unlock(&rdev->mutex);
2920
2921         return ret;
2922 }
2923 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2924
2925 /**
2926  * regulator_register_notifier - register regulator event notifier
2927  * @regulator: regulator source
2928  * @nb: notifier block
2929  *
2930  * Register notifier block to receive regulator events.
2931  */
2932 int regulator_register_notifier(struct regulator *regulator,
2933                               struct notifier_block *nb)
2934 {
2935         return blocking_notifier_chain_register(&regulator->rdev->notifier,
2936                                                 nb);
2937 }
2938 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2939
2940 /**
2941  * regulator_unregister_notifier - unregister regulator event notifier
2942  * @regulator: regulator source
2943  * @nb: notifier block
2944  *
2945  * Unregister regulator event notifier block.
2946  */
2947 int regulator_unregister_notifier(struct regulator *regulator,
2948                                 struct notifier_block *nb)
2949 {
2950         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2951                                                   nb);
2952 }
2953 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2954
2955 /* notify regulator consumers and downstream regulator consumers.
2956  * Note mutex must be held by caller.
2957  */
2958 static void _notifier_call_chain(struct regulator_dev *rdev,
2959                                   unsigned long event, void *data)
2960 {
2961         /* call rdev chain first */
2962         blocking_notifier_call_chain(&rdev->notifier, event, data);
2963 }
2964
2965 /**
2966  * regulator_bulk_get - get multiple regulator consumers
2967  *
2968  * @dev:           Device to supply
2969  * @num_consumers: Number of consumers to register
2970  * @consumers:     Configuration of consumers; clients are stored here.
2971  *
2972  * @return 0 on success, an errno on failure.
2973  *
2974  * This helper function allows drivers to get several regulator
2975  * consumers in one operation.  If any of the regulators cannot be
2976  * acquired then any regulators that were allocated will be freed
2977  * before returning to the caller.
2978  */
2979 int regulator_bulk_get(struct device *dev, int num_consumers,
2980                        struct regulator_bulk_data *consumers)
2981 {
2982         int i;
2983         int ret;
2984
2985         for (i = 0; i < num_consumers; i++)
2986                 consumers[i].consumer = NULL;
2987
2988         for (i = 0; i < num_consumers; i++) {
2989                 consumers[i].consumer = regulator_get(dev,
2990                                                       consumers[i].supply);
2991                 if (IS_ERR(consumers[i].consumer)) {
2992                         ret = PTR_ERR(consumers[i].consumer);
2993                         dev_err(dev, "Failed to get supply '%s': %d\n",
2994                                 consumers[i].supply, ret);
2995                         consumers[i].consumer = NULL;
2996                         goto err;
2997                 }
2998         }
2999
3000         return 0;
3001
3002 err:
3003         while (--i >= 0)
3004                 regulator_put(consumers[i].consumer);
3005
3006         return ret;
3007 }
3008 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3009
3010 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3011 {
3012         struct regulator_bulk_data *bulk = data;
3013
3014         bulk->ret = regulator_enable(bulk->consumer);
3015 }
3016
3017 /**
3018  * regulator_bulk_enable - enable multiple regulator consumers
3019  *
3020  * @num_consumers: Number of consumers
3021  * @consumers:     Consumer data; clients are stored here.
3022  * @return         0 on success, an errno on failure
3023  *
3024  * This convenience API allows consumers to enable multiple regulator
3025  * clients in a single API call.  If any consumers cannot be enabled
3026  * then any others that were enabled will be disabled again prior to
3027  * return.
3028  */
3029 int regulator_bulk_enable(int num_consumers,
3030                           struct regulator_bulk_data *consumers)
3031 {
3032         ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3033         int i;
3034         int ret = 0;
3035
3036         for (i = 0; i < num_consumers; i++) {
3037                 if (consumers[i].consumer->always_on)
3038                         consumers[i].ret = 0;
3039                 else
3040                         async_schedule_domain(regulator_bulk_enable_async,
3041                                               &consumers[i], &async_domain);
3042         }
3043
3044         async_synchronize_full_domain(&async_domain);
3045
3046         /* If any consumer failed we need to unwind any that succeeded */
3047         for (i = 0; i < num_consumers; i++) {
3048                 if (consumers[i].ret != 0) {
3049                         ret = consumers[i].ret;
3050                         goto err;
3051                 }
3052         }
3053
3054         return 0;
3055
3056 err:
3057         for (i = 0; i < num_consumers; i++) {
3058                 if (consumers[i].ret < 0)
3059                         pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3060                                consumers[i].ret);
3061                 else
3062                         regulator_disable(consumers[i].consumer);
3063         }
3064
3065         return ret;
3066 }
3067 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3068
3069 /**
3070  * regulator_bulk_disable - disable multiple regulator consumers
3071  *
3072  * @num_consumers: Number of consumers
3073  * @consumers:     Consumer data; clients are stored here.
3074  * @return         0 on success, an errno on failure
3075  *
3076  * This convenience API allows consumers to disable multiple regulator
3077  * clients in a single API call.  If any consumers cannot be disabled
3078  * then any others that were disabled will be enabled again prior to
3079  * return.
3080  */
3081 int regulator_bulk_disable(int num_consumers,
3082                            struct regulator_bulk_data *consumers)
3083 {
3084         int i;
3085         int ret, r;
3086
3087         for (i = num_consumers - 1; i >= 0; --i) {
3088                 ret = regulator_disable(consumers[i].consumer);
3089                 if (ret != 0)
3090                         goto err;
3091         }
3092
3093         return 0;
3094
3095 err:
3096         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3097         for (++i; i < num_consumers; ++i) {
3098                 r = regulator_enable(consumers[i].consumer);
3099                 if (r != 0)
3100                         pr_err("Failed to reename %s: %d\n",
3101                                consumers[i].supply, r);
3102         }
3103
3104         return ret;
3105 }
3106 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3107
3108 /**
3109  * regulator_bulk_force_disable - force disable multiple regulator consumers
3110  *
3111  * @num_consumers: Number of consumers
3112  * @consumers:     Consumer data; clients are stored here.
3113  * @return         0 on success, an errno on failure
3114  *
3115  * This convenience API allows consumers to forcibly disable multiple regulator
3116  * clients in a single API call.
3117  * NOTE: This should be used for situations when device damage will
3118  * likely occur if the regulators are not disabled (e.g. over temp).
3119  * Although regulator_force_disable function call for some consumers can
3120  * return error numbers, the function is called for all consumers.
3121  */
3122 int regulator_bulk_force_disable(int num_consumers,
3123                            struct regulator_bulk_data *consumers)
3124 {
3125         int i;
3126         int ret;
3127
3128         for (i = 0; i < num_consumers; i++)
3129                 consumers[i].ret =
3130                             regulator_force_disable(consumers[i].consumer);
3131
3132         for (i = 0; i < num_consumers; i++) {
3133                 if (consumers[i].ret != 0) {
3134                         ret = consumers[i].ret;
3135                         goto out;
3136                 }
3137         }
3138
3139         return 0;
3140 out:
3141         return ret;
3142 }
3143 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3144
3145 /**
3146  * regulator_bulk_free - free multiple regulator consumers
3147  *
3148  * @num_consumers: Number of consumers
3149  * @consumers:     Consumer data; clients are stored here.
3150  *
3151  * This convenience API allows consumers to free multiple regulator
3152  * clients in a single API call.
3153  */
3154 void regulator_bulk_free(int num_consumers,
3155                          struct regulator_bulk_data *consumers)
3156 {
3157         int i;
3158
3159         for (i = 0; i < num_consumers; i++) {
3160                 regulator_put(consumers[i].consumer);
3161                 consumers[i].consumer = NULL;
3162         }
3163 }
3164 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3165
3166 /**
3167  * regulator_notifier_call_chain - call regulator event notifier
3168  * @rdev: regulator source
3169  * @event: notifier block
3170  * @data: callback-specific data.
3171  *
3172  * Called by regulator drivers to notify clients a regulator event has
3173  * occurred. We also notify regulator clients downstream.
3174  * Note lock must be held by caller.
3175  */
3176 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3177                                   unsigned long event, void *data)
3178 {
3179         _notifier_call_chain(rdev, event, data);
3180         return NOTIFY_DONE;
3181
3182 }
3183 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3184
3185 /**
3186  * regulator_mode_to_status - convert a regulator mode into a status
3187  *
3188  * @mode: Mode to convert
3189  *
3190  * Convert a regulator mode into a status.
3191  */
3192 int regulator_mode_to_status(unsigned int mode)
3193 {
3194         switch (mode) {
3195         case REGULATOR_MODE_FAST:
3196                 return REGULATOR_STATUS_FAST;
3197         case REGULATOR_MODE_NORMAL:
3198                 return REGULATOR_STATUS_NORMAL;
3199         case REGULATOR_MODE_IDLE:
3200                 return REGULATOR_STATUS_IDLE;
3201         case REGULATOR_MODE_STANDBY:
3202                 return REGULATOR_STATUS_STANDBY;
3203         default:
3204                 return REGULATOR_STATUS_UNDEFINED;
3205         }
3206 }
3207 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3208
3209 /*
3210  * To avoid cluttering sysfs (and memory) with useless state, only
3211  * create attributes that can be meaningfully displayed.
3212  */
3213 static int add_regulator_attributes(struct regulator_dev *rdev)
3214 {
3215         struct device           *dev = &rdev->dev;
3216         struct regulator_ops    *ops = rdev->desc->ops;
3217         int                     status = 0;
3218
3219         /* some attributes need specific methods to be displayed */
3220         if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3221             (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3222             (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3223                 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) {
3224                 status = device_create_file(dev, &dev_attr_microvolts);
3225                 if (status < 0)
3226                         return status;
3227         }
3228         if (ops->get_current_limit) {
3229                 status = device_create_file(dev, &dev_attr_microamps);
3230                 if (status < 0)
3231                         return status;
3232         }
3233         if (ops->get_mode) {
3234                 status = device_create_file(dev, &dev_attr_opmode);
3235                 if (status < 0)
3236                         return status;
3237         }
3238         if (rdev->ena_pin || ops->is_enabled) {
3239                 status = device_create_file(dev, &dev_attr_state);
3240                 if (status < 0)
3241                         return status;
3242         }
3243         if (ops->get_status) {
3244                 status = device_create_file(dev, &dev_attr_status);
3245                 if (status < 0)
3246                         return status;
3247         }
3248         if (ops->get_bypass) {
3249                 status = device_create_file(dev, &dev_attr_bypass);
3250                 if (status < 0)
3251                         return status;
3252         }
3253
3254         /* some attributes are type-specific */
3255         if (rdev->desc->type == REGULATOR_CURRENT) {
3256                 status = device_create_file(dev, &dev_attr_requested_microamps);
3257                 if (status < 0)
3258                         return status;
3259         }
3260
3261         /* all the other attributes exist to support constraints;
3262          * don't show them if there are no constraints, or if the
3263          * relevant supporting methods are missing.
3264          */
3265         if (!rdev->constraints)
3266                 return status;
3267
3268         /* constraints need specific supporting methods */
3269         if (ops->set_voltage || ops->set_voltage_sel) {
3270                 status = device_create_file(dev, &dev_attr_min_microvolts);
3271                 if (status < 0)
3272                         return status;
3273                 status = device_create_file(dev, &dev_attr_max_microvolts);
3274                 if (status < 0)
3275                         return status;
3276         }
3277         if (ops->set_current_limit) {
3278                 status = device_create_file(dev, &dev_attr_min_microamps);
3279                 if (status < 0)
3280                         return status;
3281                 status = device_create_file(dev, &dev_attr_max_microamps);
3282                 if (status < 0)
3283                         return status;
3284         }
3285
3286         status = device_create_file(dev, &dev_attr_suspend_standby_state);
3287         if (status < 0)
3288                 return status;
3289         status = device_create_file(dev, &dev_attr_suspend_mem_state);
3290         if (status < 0)
3291                 return status;
3292         status = device_create_file(dev, &dev_attr_suspend_disk_state);
3293         if (status < 0)
3294                 return status;
3295
3296         if (ops->set_suspend_voltage) {
3297                 status = device_create_file(dev,
3298                                 &dev_attr_suspend_standby_microvolts);
3299                 if (status < 0)
3300                         return status;
3301                 status = device_create_file(dev,
3302                                 &dev_attr_suspend_mem_microvolts);
3303                 if (status < 0)
3304                         return status;
3305                 status = device_create_file(dev,
3306                                 &dev_attr_suspend_disk_microvolts);
3307                 if (status < 0)
3308                         return status;
3309         }
3310
3311         if (ops->set_suspend_mode) {
3312                 status = device_create_file(dev,
3313                                 &dev_attr_suspend_standby_mode);
3314                 if (status < 0)
3315                         return status;
3316                 status = device_create_file(dev,
3317                                 &dev_attr_suspend_mem_mode);
3318                 if (status < 0)
3319                         return status;
3320                 status = device_create_file(dev,
3321                                 &dev_attr_suspend_disk_mode);
3322                 if (status < 0)
3323                         return status;
3324         }
3325
3326         return status;
3327 }
3328
3329 static void rdev_init_debugfs(struct regulator_dev *rdev)
3330 {
3331         rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3332         if (!rdev->debugfs) {
3333                 rdev_warn(rdev, "Failed to create debugfs directory\n");
3334                 return;
3335         }
3336
3337         debugfs_create_u32("use_count", 0444, rdev->debugfs,
3338                            &rdev->use_count);
3339         debugfs_create_u32("open_count", 0444, rdev->debugfs,
3340                            &rdev->open_count);
3341         debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3342                            &rdev->bypass_count);
3343 }
3344
3345 /**
3346  * regulator_register - register regulator
3347  * @regulator_desc: regulator to register
3348  * @config: runtime configuration for regulator
3349  *
3350  * Called by regulator drivers to register a regulator.
3351  * Returns a valid pointer to struct regulator_dev on success
3352  * or an ERR_PTR() on error.
3353  */
3354 struct regulator_dev *
3355 regulator_register(const struct regulator_desc *regulator_desc,
3356                    const struct regulator_config *config)
3357 {
3358         const struct regulation_constraints *constraints = NULL;
3359         const struct regulator_init_data *init_data;
3360         static atomic_t regulator_no = ATOMIC_INIT(0);
3361         struct regulator_dev *rdev;
3362         struct device *dev;
3363         int ret, i;
3364         const char *supply = NULL;
3365
3366         if (regulator_desc == NULL || config == NULL)
3367                 return ERR_PTR(-EINVAL);
3368
3369         dev = config->dev;
3370         WARN_ON(!dev);
3371
3372         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3373                 return ERR_PTR(-EINVAL);
3374
3375         if (regulator_desc->type != REGULATOR_VOLTAGE &&
3376             regulator_desc->type != REGULATOR_CURRENT)
3377                 return ERR_PTR(-EINVAL);
3378
3379         /* Only one of each should be implemented */
3380         WARN_ON(regulator_desc->ops->get_voltage &&
3381                 regulator_desc->ops->get_voltage_sel);
3382         WARN_ON(regulator_desc->ops->set_voltage &&
3383                 regulator_desc->ops->set_voltage_sel);
3384
3385         /* If we're using selectors we must implement list_voltage. */
3386         if (regulator_desc->ops->get_voltage_sel &&
3387             !regulator_desc->ops->list_voltage) {
3388                 return ERR_PTR(-EINVAL);
3389         }
3390         if (regulator_desc->ops->set_voltage_sel &&
3391             !regulator_desc->ops->list_voltage) {
3392                 return ERR_PTR(-EINVAL);
3393         }
3394
3395         init_data = config->init_data;
3396
3397         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3398         if (rdev == NULL)
3399                 return ERR_PTR(-ENOMEM);
3400
3401         mutex_lock(&regulator_list_mutex);
3402
3403         mutex_init(&rdev->mutex);
3404         rdev->reg_data = config->driver_data;
3405         rdev->owner = regulator_desc->owner;
3406         rdev->desc = regulator_desc;
3407         if (config->regmap)
3408                 rdev->regmap = config->regmap;
3409         else if (dev_get_regmap(dev, NULL))
3410                 rdev->regmap = dev_get_regmap(dev, NULL);
3411         else if (dev->parent)
3412                 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3413         INIT_LIST_HEAD(&rdev->consumer_list);
3414         INIT_LIST_HEAD(&rdev->list);
3415         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3416         INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3417
3418         /* preform any regulator specific init */
3419         if (init_data && init_data->regulator_init) {
3420                 ret = init_data->regulator_init(rdev->reg_data);
3421                 if (ret < 0)
3422                         goto clean;
3423         }
3424
3425         /* register with sysfs */
3426         rdev->dev.class = &regulator_class;
3427         rdev->dev.of_node = config->of_node;
3428         rdev->dev.parent = dev;
3429         dev_set_name(&rdev->dev, "regulator.%d",
3430                      atomic_inc_return(&regulator_no) - 1);
3431         ret = device_register(&rdev->dev);
3432         if (ret != 0) {
3433                 put_device(&rdev->dev);
3434                 goto clean;
3435         }
3436
3437         dev_set_drvdata(&rdev->dev, rdev);
3438
3439         if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3440                 ret = regulator_ena_gpio_request(rdev, config);
3441                 if (ret != 0) {
3442                         rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3443                                  config->ena_gpio, ret);
3444                         goto wash;
3445                 }
3446
3447                 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3448                         rdev->ena_gpio_state = 1;
3449
3450                 if (config->ena_gpio_invert)
3451                         rdev->ena_gpio_state = !rdev->ena_gpio_state;
3452         }
3453
3454         /* set regulator constraints */
3455         if (init_data)
3456                 constraints = &init_data->constraints;
3457
3458         ret = set_machine_constraints(rdev, constraints);
3459         if (ret < 0)
3460                 goto scrub;
3461
3462         /* add attributes supported by this regulator */
3463         ret = add_regulator_attributes(rdev);
3464         if (ret < 0)
3465                 goto scrub;
3466
3467         if (init_data && init_data->supply_regulator)
3468                 supply = init_data->supply_regulator;
3469         else if (regulator_desc->supply_name)
3470                 supply = regulator_desc->supply_name;
3471
3472         if (supply) {
3473                 struct regulator_dev *r;
3474
3475                 r = regulator_dev_lookup(dev, supply, &ret);
3476
3477                 if (ret == -ENODEV) {
3478                         /*
3479                          * No supply was specified for this regulator and
3480                          * there will never be one.
3481                          */
3482                         ret = 0;
3483                         goto add_dev;
3484                 } else if (!r) {
3485                         dev_err(dev, "Failed to find supply %s\n", supply);
3486                         ret = -EPROBE_DEFER;
3487                         goto scrub;
3488                 }
3489
3490                 ret = set_supply(rdev, r);
3491                 if (ret < 0)
3492                         goto scrub;
3493
3494                 /* Enable supply if rail is enabled */
3495                 if (_regulator_is_enabled(rdev)) {
3496                         ret = regulator_enable(rdev->supply);
3497                         if (ret < 0)
3498                                 goto scrub;
3499                 }
3500         }
3501
3502 add_dev:
3503         /* add consumers devices */
3504         if (init_data) {
3505                 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3506                         ret = set_consumer_device_supply(rdev,
3507                                 init_data->consumer_supplies[i].dev_name,
3508                                 init_data->consumer_supplies[i].supply);
3509                         if (ret < 0) {
3510                                 dev_err(dev, "Failed to set supply %s\n",
3511                                         init_data->consumer_supplies[i].supply);
3512                                 goto unset_supplies;
3513                         }
3514                 }
3515         }
3516
3517         list_add(&rdev->list, &regulator_list);
3518
3519         rdev_init_debugfs(rdev);
3520 out:
3521         mutex_unlock(&regulator_list_mutex);
3522         return rdev;
3523
3524 unset_supplies:
3525         unset_regulator_supplies(rdev);
3526
3527 scrub:
3528         if (rdev->supply)
3529                 _regulator_put(rdev->supply);
3530         regulator_ena_gpio_free(rdev);
3531         kfree(rdev->constraints);
3532 wash:
3533         device_unregister(&rdev->dev);
3534         /* device core frees rdev */
3535         rdev = ERR_PTR(ret);
3536         goto out;
3537
3538 clean:
3539         kfree(rdev);
3540         rdev = ERR_PTR(ret);
3541         goto out;
3542 }
3543 EXPORT_SYMBOL_GPL(regulator_register);
3544
3545 /**
3546  * regulator_unregister - unregister regulator
3547  * @rdev: regulator to unregister
3548  *
3549  * Called by regulator drivers to unregister a regulator.
3550  */
3551 void regulator_unregister(struct regulator_dev *rdev)
3552 {
3553         if (rdev == NULL)
3554                 return;
3555
3556         if (rdev->supply) {
3557                 while (rdev->use_count--)
3558                         regulator_disable(rdev->supply);
3559                 regulator_put(rdev->supply);
3560         }
3561         mutex_lock(&regulator_list_mutex);
3562         debugfs_remove_recursive(rdev->debugfs);
3563         flush_work(&rdev->disable_work.work);
3564         WARN_ON(rdev->open_count);
3565         unset_regulator_supplies(rdev);
3566         list_del(&rdev->list);
3567         kfree(rdev->constraints);
3568         regulator_ena_gpio_free(rdev);
3569         device_unregister(&rdev->dev);
3570         mutex_unlock(&regulator_list_mutex);
3571 }
3572 EXPORT_SYMBOL_GPL(regulator_unregister);
3573
3574 /**
3575  * regulator_suspend_prepare - prepare regulators for system wide suspend
3576  * @state: system suspend state
3577  *
3578  * Configure each regulator with it's suspend operating parameters for state.
3579  * This will usually be called by machine suspend code prior to supending.
3580  */
3581 int regulator_suspend_prepare(suspend_state_t state)
3582 {
3583         struct regulator_dev *rdev;
3584         int ret = 0;
3585
3586         /* ON is handled by regulator active state */
3587         if (state == PM_SUSPEND_ON)
3588                 return -EINVAL;
3589
3590         mutex_lock(&regulator_list_mutex);
3591         list_for_each_entry(rdev, &regulator_list, list) {
3592
3593                 mutex_lock(&rdev->mutex);
3594                 ret = suspend_prepare(rdev, state);
3595                 mutex_unlock(&rdev->mutex);
3596
3597                 if (ret < 0) {
3598                         rdev_err(rdev, "failed to prepare\n");
3599                         goto out;
3600                 }
3601         }
3602 out:
3603         mutex_unlock(&regulator_list_mutex);
3604         return ret;
3605 }
3606 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3607
3608 /**
3609  * regulator_suspend_finish - resume regulators from system wide suspend
3610  *
3611  * Turn on regulators that might be turned off by regulator_suspend_prepare
3612  * and that should be turned on according to the regulators properties.
3613  */
3614 int regulator_suspend_finish(void)
3615 {
3616         struct regulator_dev *rdev;
3617         int ret = 0, error;
3618
3619         mutex_lock(&regulator_list_mutex);
3620         list_for_each_entry(rdev, &regulator_list, list) {
3621                 struct regulator_ops *ops = rdev->desc->ops;
3622
3623                 mutex_lock(&rdev->mutex);
3624                 if ((rdev->use_count > 0  || rdev->constraints->always_on) &&
3625                                 ops->enable) {
3626                         error = ops->enable(rdev);
3627                         if (error)
3628                                 ret = error;
3629                 } else {
3630                         if (!has_full_constraints)
3631                                 goto unlock;
3632                         if (!ops->disable)
3633                                 goto unlock;
3634                         if (!_regulator_is_enabled(rdev))
3635                                 goto unlock;
3636
3637                         error = ops->disable(rdev);
3638                         if (error)
3639                                 ret = error;
3640                 }
3641 unlock:
3642                 mutex_unlock(&rdev->mutex);
3643         }
3644         mutex_unlock(&regulator_list_mutex);
3645         return ret;
3646 }
3647 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3648
3649 /**
3650  * regulator_has_full_constraints - the system has fully specified constraints
3651  *
3652  * Calling this function will cause the regulator API to disable all
3653  * regulators which have a zero use count and don't have an always_on
3654  * constraint in a late_initcall.
3655  *
3656  * The intention is that this will become the default behaviour in a
3657  * future kernel release so users are encouraged to use this facility
3658  * now.
3659  */
3660 void regulator_has_full_constraints(void)
3661 {
3662         has_full_constraints = 1;
3663 }
3664 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3665
3666 /**
3667  * rdev_get_drvdata - get rdev regulator driver data
3668  * @rdev: regulator
3669  *
3670  * Get rdev regulator driver private data. This call can be used in the
3671  * regulator driver context.
3672  */
3673 void *rdev_get_drvdata(struct regulator_dev *rdev)
3674 {
3675         return rdev->reg_data;
3676 }
3677 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3678
3679 /**
3680  * regulator_get_drvdata - get regulator driver data
3681  * @regulator: regulator
3682  *
3683  * Get regulator driver private data. This call can be used in the consumer
3684  * driver context when non API regulator specific functions need to be called.
3685  */
3686 void *regulator_get_drvdata(struct regulator *regulator)
3687 {
3688         return regulator->rdev->reg_data;
3689 }
3690 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3691
3692 /**
3693  * regulator_set_drvdata - set regulator driver data
3694  * @regulator: regulator
3695  * @data: data
3696  */
3697 void regulator_set_drvdata(struct regulator *regulator, void *data)
3698 {
3699         regulator->rdev->reg_data = data;
3700 }
3701 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3702
3703 /**
3704  * regulator_get_id - get regulator ID
3705  * @rdev: regulator
3706  */
3707 int rdev_get_id(struct regulator_dev *rdev)
3708 {
3709         return rdev->desc->id;
3710 }
3711 EXPORT_SYMBOL_GPL(rdev_get_id);
3712
3713 struct device *rdev_get_dev(struct regulator_dev *rdev)
3714 {
3715         return &rdev->dev;
3716 }
3717 EXPORT_SYMBOL_GPL(rdev_get_dev);
3718
3719 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3720 {
3721         return reg_init_data->driver_data;
3722 }
3723 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3724
3725 #ifdef CONFIG_DEBUG_FS
3726 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3727                                     size_t count, loff_t *ppos)
3728 {
3729         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3730         ssize_t len, ret = 0;
3731         struct regulator_map *map;
3732
3733         if (!buf)
3734                 return -ENOMEM;
3735
3736         list_for_each_entry(map, &regulator_map_list, list) {
3737                 len = snprintf(buf + ret, PAGE_SIZE - ret,
3738                                "%s -> %s.%s\n",
3739                                rdev_get_name(map->regulator), map->dev_name,
3740                                map->supply);
3741                 if (len >= 0)
3742                         ret += len;
3743                 if (ret > PAGE_SIZE) {
3744                         ret = PAGE_SIZE;
3745                         break;
3746                 }
3747         }
3748
3749         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3750
3751         kfree(buf);
3752
3753         return ret;
3754 }
3755 #endif
3756
3757 static const struct file_operations supply_map_fops = {
3758 #ifdef CONFIG_DEBUG_FS
3759         .read = supply_map_read_file,
3760         .llseek = default_llseek,
3761 #endif
3762 };
3763
3764 static int __init regulator_init(void)
3765 {
3766         int ret;
3767
3768         ret = class_register(&regulator_class);
3769
3770         debugfs_root = debugfs_create_dir("regulator", NULL);
3771         if (!debugfs_root)
3772                 pr_warn("regulator: Failed to create debugfs directory\n");
3773
3774         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3775                             &supply_map_fops);
3776
3777         regulator_dummy_init();
3778
3779         return ret;
3780 }
3781
3782 /* init early to allow our consumers to complete system booting */
3783 core_initcall(regulator_init);
3784
3785 static int __init regulator_init_complete(void)
3786 {
3787         struct regulator_dev *rdev;
3788         struct regulator_ops *ops;
3789         struct regulation_constraints *c;
3790         int enabled, ret;
3791
3792         /*
3793          * Since DT doesn't provide an idiomatic mechanism for
3794          * enabling full constraints and since it's much more natural
3795          * with DT to provide them just assume that a DT enabled
3796          * system has full constraints.
3797          */
3798         if (of_have_populated_dt())
3799                 has_full_constraints = true;
3800
3801         mutex_lock(&regulator_list_mutex);
3802
3803         /* If we have a full configuration then disable any regulators
3804          * which are not in use or always_on.  This will become the
3805          * default behaviour in the future.
3806          */
3807         list_for_each_entry(rdev, &regulator_list, list) {
3808                 ops = rdev->desc->ops;
3809                 c = rdev->constraints;
3810
3811                 if (!ops->disable || (c && c->always_on))
3812                         continue;
3813
3814                 mutex_lock(&rdev->mutex);
3815
3816                 if (rdev->use_count)
3817                         goto unlock;
3818
3819                 /* If we can't read the status assume it's on. */
3820                 if (ops->is_enabled)
3821                         enabled = ops->is_enabled(rdev);
3822                 else
3823                         enabled = 1;
3824
3825                 if (!enabled)
3826                         goto unlock;
3827
3828                 if (has_full_constraints) {
3829                         /* We log since this may kill the system if it
3830                          * goes wrong. */
3831                         rdev_info(rdev, "disabling\n");
3832                         ret = ops->disable(rdev);
3833                         if (ret != 0) {
3834                                 rdev_err(rdev, "couldn't disable: %d\n", ret);
3835                         }
3836                 } else {
3837                         /* The intention is that in future we will
3838                          * assume that full constraints are provided
3839                          * so warn even if we aren't going to do
3840                          * anything here.
3841                          */
3842                         rdev_warn(rdev, "incomplete constraints, leaving on\n");
3843                 }
3844
3845 unlock:
3846                 mutex_unlock(&rdev->mutex);
3847         }
3848
3849         mutex_unlock(&regulator_list_mutex);
3850
3851         return 0;
3852 }
3853 late_initcall(regulator_init_complete);