drivers/regulator/core.c

   1 /*
   2  * core.c  --  Voltage/Current Regulator framework.
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  * Copyright 2008 SlimLogic Ltd.
   6  *
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/device.h>
  20 #include <linux/slab.h>
  21 #include <linux/async.h>
  22 #include <linux/err.h>
  23 #include <linux/mutex.h>
  24 #include <linux/suspend.h>
  25 #include <linux/delay.h>
  26 #include <linux/gpio.h>
  27 #include <linux/gpio/consumer.h>
  28 #include <linux/of.h>
  29 #include <linux/regmap.h>
  30 #include <linux/regulator/of_regulator.h>
  31 #include <linux/regulator/consumer.h>
  32 #include <linux/regulator/driver.h>
  33 #include <linux/regulator/machine.h>
  34 #include <linux/module.h>
  35
  36 #define CREATE_TRACE_POINTS
  37 #include <trace/events/regulator.h>
  38
  39 #include "dummy.h"
  40 #include "internal.h"
  41
  42 #define rdev_crit(rdev, fmt, ...)                                       \
  43         pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  44 #define rdev_err(rdev, fmt, ...)                                        \
  45         pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  46 #define rdev_warn(rdev, fmt, ...)                                       \
  47         pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  48 #define rdev_info(rdev, fmt, ...)                                       \
  49         pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  50 #define rdev_dbg(rdev, fmt, ...)                                        \
  51         pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  52
  53 static DEFINE_MUTEX(regulator_list_mutex);
  54 static LIST_HEAD(regulator_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 static struct class regulator_class;
  62
  63 /*
  64  * struct regulator_map
  65  *
  66  * Used to provide symbolic supply names to devices.
  67  */
  68 struct regulator_map {
  69         struct list_head list;
  70         const char *dev_name;   /* The dev_name() for the consumer */
  71         const char *supply;
  72         struct regulator_dev *regulator;
  73 };
  74
  75 /*
  76  * struct regulator_enable_gpio
  77  *
  78  * Management for shared enable GPIO pin
  79  */
  80 struct regulator_enable_gpio {
  81         struct list_head list;
  82         struct gpio_desc *gpiod;
  83         u32 enable_count;       /* a number of enabled shared GPIO */
  84         u32 request_count;      /* a number of requested shared GPIO */
  85         unsigned int ena_gpio_invert:1;
  86 };
  87
  88 /*
  89  * struct regulator_supply_alias
  90  *
  91  * Used to map lookups for a supply onto an alternative device.
  92  */
  93 struct regulator_supply_alias {
  94         struct list_head list;
  95         struct device *src_dev;
  96         const char *src_supply;
  97         struct device *alias_dev;
  98         const char *alias_supply;
  99 };
 100
 101 static int _regulator_is_enabled(struct regulator_dev *rdev);
 102 static int _regulator_disable(struct regulator_dev *rdev);
 103 static int _regulator_get_voltage(struct regulator_dev *rdev);
 104 static int _regulator_get_current_limit(struct regulator_dev *rdev);
 105 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
 106 static int _notifier_call_chain(struct regulator_dev *rdev,
 107                                   unsigned long event, void *data);
 108 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 109                                      int min_uV, int max_uV);
 110 static struct regulator *create_regulator(struct regulator_dev *rdev,
 111                                           struct device *dev,
 112                                           const char *supply_name);
 113 static void _regulator_put(struct regulator *regulator);
 114
 115 static struct regulator_dev *dev_to_rdev(struct device *dev)
 116 {
 117         return container_of(dev, struct regulator_dev, dev);
 118 }
 119
 120 static const char *rdev_get_name(struct regulator_dev *rdev)
 121 {
 122         if (rdev->constraints && rdev->constraints->name)
 123                 return rdev->constraints->name;
 124         else if (rdev->desc->name)
 125                 return rdev->desc->name;
 126         else
 127                 return "";
 128 }
 129
 130 static bool have_full_constraints(void)
 131 {
 132         return has_full_constraints || of_have_populated_dt();
 133 }
 134
 135 static bool regulator_ops_is_valid(struct regulator_dev *rdev, int ops)
 136 {
 137         if (!rdev->constraints) {
 138                 rdev_err(rdev, "no constraints\n");
 139                 return false;
 140         }
 141
 142         if (rdev->constraints->valid_ops_mask & ops)
 143                 return true;
 144
 145         return false;
 146 }
 147
 148 static inline struct regulator_dev *rdev_get_supply(struct regulator_dev *rdev)
 149 {
 150         if (rdev && rdev->supply)
 151                 return rdev->supply->rdev;
 152
 153         return NULL;
 154 }
 155
 156 /**
 157  * regulator_lock_supply - lock a regulator and its supplies
 158  * @rdev:         regulator source
 159  */
 160 static void regulator_lock_supply(struct regulator_dev *rdev)
 161 {
 162         int i;
 163
 164         for (i = 0; rdev; rdev = rdev_get_supply(rdev), i++)
 165                 mutex_lock_nested(&rdev->mutex, i);
 166 }
 167
 168 /**
 169  * regulator_unlock_supply - unlock a regulator and its supplies
 170  * @rdev:         regulator source
 171  */
 172 static void regulator_unlock_supply(struct regulator_dev *rdev)
 173 {
 174         struct regulator *supply;
 175
 176         while (1) {
 177                 mutex_unlock(&rdev->mutex);
 178                 supply = rdev->supply;
 179
 180                 if (!rdev->supply)
 181                         return;
 182
 183                 rdev = supply->rdev;
 184         }
 185 }
 186
 187 /**
 188  * of_get_regulator - get a regulator device node based on supply name
 189  * @dev: Device pointer for the consumer (of regulator) device
 190  * @supply: regulator supply name
 191  *
 192  * Extract the regulator device node corresponding to the supply name.
 193  * returns the device node corresponding to the regulator if found, else
 194  * returns NULL.
 195  */
 196 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 197 {
 198         struct device_node *regnode = NULL;
 199         char prop_name[32]; /* 32 is max size of property name */
 200
 201         dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
 202
 203         snprintf(prop_name, 32, "%s-supply", supply);
 204         regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 205
 206         if (!regnode) {
 207                 dev_dbg(dev, "Looking up %s property in node %s failed\n",
 208                                 prop_name, dev->of_node->full_name);
 209                 return NULL;
 210         }
 211         return regnode;
 212 }
 213
 214 /* Platform voltage constraint check */
 215 static int regulator_check_voltage(struct regulator_dev *rdev,
 216                                    int *min_uV, int *max_uV)
 217 {
 218         BUG_ON(*min_uV > *max_uV);
 219
 220         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
 221                 rdev_err(rdev, "voltage operation not allowed\n");
 222                 return -EPERM;
 223         }
 224
 225         if (*max_uV > rdev->constraints->max_uV)
 226                 *max_uV = rdev->constraints->max_uV;
 227         if (*min_uV < rdev->constraints->min_uV)
 228                 *min_uV = rdev->constraints->min_uV;
 229
 230         if (*min_uV > *max_uV) {
 231                 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
 232                          *min_uV, *max_uV);
 233                 return -EINVAL;
 234         }
 235
 236         return 0;
 237 }
 238
 239 /* Make sure we select a voltage that suits the needs of all
 240  * regulator consumers
 241  */
 242 static int regulator_check_consumers(struct regulator_dev *rdev,
 243                                      int *min_uV, int *max_uV)
 244 {
 245         struct regulator *regulator;
 246
 247         list_for_each_entry(regulator, &rdev->consumer_list, list) {
 248                 /*
 249                  * Assume consumers that didn't say anything are OK
 250                  * with anything in the constraint range.
 251                  */
 252                 if (!regulator->min_uV && !regulator->max_uV)
 253                         continue;
 254
 255                 if (*max_uV > regulator->max_uV)
 256                         *max_uV = regulator->max_uV;
 257                 if (*min_uV < regulator->min_uV)
 258                         *min_uV = regulator->min_uV;
 259         }
 260
 261         if (*min_uV > *max_uV) {
 262                 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
 263                         *min_uV, *max_uV);
 264                 return -EINVAL;
 265         }
 266
 267         return 0;
 268 }
 269
 270 /* current constraint check */
 271 static int regulator_check_current_limit(struct regulator_dev *rdev,
 272                                         int *min_uA, int *max_uA)
 273 {
 274         BUG_ON(*min_uA > *max_uA);
 275
 276         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_CURRENT)) {
 277                 rdev_err(rdev, "current operation not allowed\n");
 278                 return -EPERM;
 279         }
 280
 281         if (*max_uA > rdev->constraints->max_uA)
 282                 *max_uA = rdev->constraints->max_uA;
 283         if (*min_uA < rdev->constraints->min_uA)
 284                 *min_uA = rdev->constraints->min_uA;
 285
 286         if (*min_uA > *max_uA) {
 287                 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
 288                          *min_uA, *max_uA);
 289                 return -EINVAL;
 290         }
 291
 292         return 0;
 293 }
 294
 295 /* operating mode constraint check */
 296 static int regulator_mode_constrain(struct regulator_dev *rdev,
 297                                     unsigned int *mode)
 298 {
 299         switch (*mode) {
 300         case REGULATOR_MODE_FAST:
 301         case REGULATOR_MODE_NORMAL:
 302         case REGULATOR_MODE_IDLE:
 303         case REGULATOR_MODE_STANDBY:
 304                 break;
 305         default:
 306                 rdev_err(rdev, "invalid mode %x specified\n", *mode);
 307                 return -EINVAL;
 308         }
 309
 310         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_MODE)) {
 311                 rdev_err(rdev, "mode operation not allowed\n");
 312                 return -EPERM;
 313         }
 314
 315         /* The modes are bitmasks, the most power hungry modes having
 316          * the lowest values. If the requested mode isn't supported
 317          * try higher modes. */
 318         while (*mode) {
 319                 if (rdev->constraints->valid_modes_mask & *mode)
 320                         return 0;
 321                 *mode /= 2;
 322         }
 323
 324         return -EINVAL;
 325 }
 326
 327 static ssize_t regulator_uV_show(struct device *dev,
 328                                 struct device_attribute *attr, char *buf)
 329 {
 330         struct regulator_dev *rdev = dev_get_drvdata(dev);
 331         ssize_t ret;
 332
 333         mutex_lock(&rdev->mutex);
 334         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 335         mutex_unlock(&rdev->mutex);
 336
 337         return ret;
 338 }
 339 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 340
 341 static ssize_t regulator_uA_show(struct device *dev,
 342                                 struct device_attribute *attr, char *buf)
 343 {
 344         struct regulator_dev *rdev = dev_get_drvdata(dev);
 345
 346         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 347 }
 348 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 349
 350 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 351                          char *buf)
 352 {
 353         struct regulator_dev *rdev = dev_get_drvdata(dev);
 354
 355         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 356 }
 357 static DEVICE_ATTR_RO(name);
 358
 359 static ssize_t regulator_print_opmode(char *buf, int mode)
 360 {
 361         switch (mode) {
 362         case REGULATOR_MODE_FAST:
 363                 return sprintf(buf, "fast\n");
 364         case REGULATOR_MODE_NORMAL:
 365                 return sprintf(buf, "normal\n");
 366         case REGULATOR_MODE_IDLE:
 367                 return sprintf(buf, "idle\n");
 368         case REGULATOR_MODE_STANDBY:
 369                 return sprintf(buf, "standby\n");
 370         }
 371         return sprintf(buf, "unknown\n");
 372 }
 373
 374 static ssize_t regulator_opmode_show(struct device *dev,
 375                                     struct device_attribute *attr, char *buf)
 376 {
 377         struct regulator_dev *rdev = dev_get_drvdata(dev);
 378
 379         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 380 }
 381 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 382
 383 static ssize_t regulator_print_state(char *buf, int state)
 384 {
 385         if (state > 0)
 386                 return sprintf(buf, "enabled\n");
 387         else if (state == 0)
 388                 return sprintf(buf, "disabled\n");
 389         else
 390                 return sprintf(buf, "unknown\n");
 391 }
 392
 393 static ssize_t regulator_state_show(struct device *dev,
 394                                    struct device_attribute *attr, char *buf)
 395 {
 396         struct regulator_dev *rdev = dev_get_drvdata(dev);
 397         ssize_t ret;
 398
 399         mutex_lock(&rdev->mutex);
 400         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 401         mutex_unlock(&rdev->mutex);
 402
 403         return ret;
 404 }
 405 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 406
 407 static ssize_t regulator_status_show(struct device *dev,
 408                                    struct device_attribute *attr, char *buf)
 409 {
 410         struct regulator_dev *rdev = dev_get_drvdata(dev);
 411         int status;
 412         char *label;
 413
 414         status = rdev->desc->ops->get_status(rdev);
 415         if (status < 0)
 416                 return status;
 417
 418         switch (status) {
 419         case REGULATOR_STATUS_OFF:
 420                 label = "off";
 421                 break;
 422         case REGULATOR_STATUS_ON:
 423                 label = "on";
 424                 break;
 425         case REGULATOR_STATUS_ERROR:
 426                 label = "error";
 427                 break;
 428         case REGULATOR_STATUS_FAST:
 429                 label = "fast";
 430                 break;
 431         case REGULATOR_STATUS_NORMAL:
 432                 label = "normal";
 433                 break;
 434         case REGULATOR_STATUS_IDLE:
 435                 label = "idle";
 436                 break;
 437         case REGULATOR_STATUS_STANDBY:
 438                 label = "standby";
 439                 break;
 440         case REGULATOR_STATUS_BYPASS:
 441                 label = "bypass";
 442                 break;
 443         case REGULATOR_STATUS_UNDEFINED:
 444                 label = "undefined";
 445                 break;
 446         default:
 447                 return -ERANGE;
 448         }
 449
 450         return sprintf(buf, "%s\n", label);
 451 }
 452 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 453
 454 static ssize_t regulator_min_uA_show(struct device *dev,
 455                                     struct device_attribute *attr, char *buf)
 456 {
 457         struct regulator_dev *rdev = dev_get_drvdata(dev);
 458
 459         if (!rdev->constraints)
 460                 return sprintf(buf, "constraint not defined\n");
 461
 462         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 463 }
 464 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 465
 466 static ssize_t regulator_max_uA_show(struct device *dev,
 467                                     struct device_attribute *attr, char *buf)
 468 {
 469         struct regulator_dev *rdev = dev_get_drvdata(dev);
 470
 471         if (!rdev->constraints)
 472                 return sprintf(buf, "constraint not defined\n");
 473
 474         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 475 }
 476 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 477
 478 static ssize_t regulator_min_uV_show(struct device *dev,
 479                                     struct device_attribute *attr, char *buf)
 480 {
 481         struct regulator_dev *rdev = dev_get_drvdata(dev);
 482
 483         if (!rdev->constraints)
 484                 return sprintf(buf, "constraint not defined\n");
 485
 486         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 487 }
 488 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 489
 490 static ssize_t regulator_max_uV_show(struct device *dev,
 491                                     struct device_attribute *attr, char *buf)
 492 {
 493         struct regulator_dev *rdev = dev_get_drvdata(dev);
 494
 495         if (!rdev->constraints)
 496                 return sprintf(buf, "constraint not defined\n");
 497
 498         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 499 }
 500 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 501
 502 static ssize_t regulator_total_uA_show(struct device *dev,
 503                                       struct device_attribute *attr, char *buf)
 504 {
 505         struct regulator_dev *rdev = dev_get_drvdata(dev);
 506         struct regulator *regulator;
 507         int uA = 0;
 508
 509         mutex_lock(&rdev->mutex);
 510         list_for_each_entry(regulator, &rdev->consumer_list, list)
 511                 uA += regulator->uA_load;
 512         mutex_unlock(&rdev->mutex);
 513         return sprintf(buf, "%d\n", uA);
 514 }
 515 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 516
 517 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
 518                               char *buf)
 519 {
 520         struct regulator_dev *rdev = dev_get_drvdata(dev);
 521         return sprintf(buf, "%d\n", rdev->use_count);
 522 }
 523 static DEVICE_ATTR_RO(num_users);
 524
 525 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 526                          char *buf)
 527 {
 528         struct regulator_dev *rdev = dev_get_drvdata(dev);
 529
 530         switch (rdev->desc->type) {
 531         case REGULATOR_VOLTAGE:
 532                 return sprintf(buf, "voltage\n");
 533         case REGULATOR_CURRENT:
 534                 return sprintf(buf, "current\n");
 535         }
 536         return sprintf(buf, "unknown\n");
 537 }
 538 static DEVICE_ATTR_RO(type);
 539
 540 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 541                                 struct device_attribute *attr, char *buf)
 542 {
 543         struct regulator_dev *rdev = dev_get_drvdata(dev);
 544
 545         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 546 }
 547 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 548                 regulator_suspend_mem_uV_show, NULL);
 549
 550 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 551                                 struct device_attribute *attr, char *buf)
 552 {
 553         struct regulator_dev *rdev = dev_get_drvdata(dev);
 554
 555         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 556 }
 557 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 558                 regulator_suspend_disk_uV_show, NULL);
 559
 560 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 561                                 struct device_attribute *attr, char *buf)
 562 {
 563         struct regulator_dev *rdev = dev_get_drvdata(dev);
 564
 565         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 566 }
 567 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 568                 regulator_suspend_standby_uV_show, NULL);
 569
 570 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 571                                 struct device_attribute *attr, char *buf)
 572 {
 573         struct regulator_dev *rdev = dev_get_drvdata(dev);
 574
 575         return regulator_print_opmode(buf,
 576                 rdev->constraints->state_mem.mode);
 577 }
 578 static DEVICE_ATTR(suspend_mem_mode, 0444,
 579                 regulator_suspend_mem_mode_show, NULL);
 580
 581 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 582                                 struct device_attribute *attr, char *buf)
 583 {
 584         struct regulator_dev *rdev = dev_get_drvdata(dev);
 585
 586         return regulator_print_opmode(buf,
 587                 rdev->constraints->state_disk.mode);
 588 }
 589 static DEVICE_ATTR(suspend_disk_mode, 0444,
 590                 regulator_suspend_disk_mode_show, NULL);
 591
 592 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 593                                 struct device_attribute *attr, char *buf)
 594 {
 595         struct regulator_dev *rdev = dev_get_drvdata(dev);
 596
 597         return regulator_print_opmode(buf,
 598                 rdev->constraints->state_standby.mode);
 599 }
 600 static DEVICE_ATTR(suspend_standby_mode, 0444,
 601                 regulator_suspend_standby_mode_show, NULL);
 602
 603 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 604                                    struct device_attribute *attr, char *buf)
 605 {
 606         struct regulator_dev *rdev = dev_get_drvdata(dev);
 607
 608         return regulator_print_state(buf,
 609                         rdev->constraints->state_mem.enabled);
 610 }
 611 static DEVICE_ATTR(suspend_mem_state, 0444,
 612                 regulator_suspend_mem_state_show, NULL);
 613
 614 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 615                                    struct device_attribute *attr, char *buf)
 616 {
 617         struct regulator_dev *rdev = dev_get_drvdata(dev);
 618
 619         return regulator_print_state(buf,
 620                         rdev->constraints->state_disk.enabled);
 621 }
 622 static DEVICE_ATTR(suspend_disk_state, 0444,
 623                 regulator_suspend_disk_state_show, NULL);
 624
 625 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 626                                    struct device_attribute *attr, char *buf)
 627 {
 628         struct regulator_dev *rdev = dev_get_drvdata(dev);
 629
 630         return regulator_print_state(buf,
 631                         rdev->constraints->state_standby.enabled);
 632 }
 633 static DEVICE_ATTR(suspend_standby_state, 0444,
 634                 regulator_suspend_standby_state_show, NULL);
 635
 636 static ssize_t regulator_bypass_show(struct device *dev,
 637                                      struct device_attribute *attr, char *buf)
 638 {
 639         struct regulator_dev *rdev = dev_get_drvdata(dev);
 640         const char *report;
 641         bool bypass;
 642         int ret;
 643
 644         ret = rdev->desc->ops->get_bypass(rdev, &bypass);
 645
 646         if (ret != 0)
 647                 report = "unknown";
 648         else if (bypass)
 649                 report = "enabled";
 650         else
 651                 report = "disabled";
 652
 653         return sprintf(buf, "%s\n", report);
 654 }
 655 static DEVICE_ATTR(bypass, 0444,
 656                    regulator_bypass_show, NULL);
 657
 658 /* Calculate the new optimum regulator operating mode based on the new total
 659  * consumer load. All locks held by caller */
 660 static int drms_uA_update(struct regulator_dev *rdev)
 661 {
 662         struct regulator *sibling;
 663         int current_uA = 0, output_uV, input_uV, err;
 664         unsigned int mode;
 665
 666         lockdep_assert_held_once(&rdev->mutex);
 667
 668         /*
 669          * first check to see if we can set modes at all, otherwise just
 670          * tell the consumer everything is OK.
 671          */
 672         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
 673                 return 0;
 674
 675         if (!rdev->desc->ops->get_optimum_mode &&
 676             !rdev->desc->ops->set_load)
 677                 return 0;
 678
 679         if (!rdev->desc->ops->set_mode &&
 680             !rdev->desc->ops->set_load)
 681                 return -EINVAL;
 682
 683         /* calc total requested load */
 684         list_for_each_entry(sibling, &rdev->consumer_list, list)
 685                 current_uA += sibling->uA_load;
 686
 687         current_uA += rdev->constraints->system_load;
 688
 689         if (rdev->desc->ops->set_load) {
 690                 /* set the optimum mode for our new total regulator load */
 691                 err = rdev->desc->ops->set_load(rdev, current_uA);
 692                 if (err < 0)
 693                         rdev_err(rdev, "failed to set load %d\n", current_uA);
 694         } else {
 695                 /* get output voltage */
 696                 output_uV = _regulator_get_voltage(rdev);
 697                 if (output_uV <= 0) {
 698                         rdev_err(rdev, "invalid output voltage found\n");
 699                         return -EINVAL;
 700                 }
 701
 702                 /* get input voltage */
 703                 input_uV = 0;
 704                 if (rdev->supply)
 705                         input_uV = regulator_get_voltage(rdev->supply);
 706                 if (input_uV <= 0)
 707                         input_uV = rdev->constraints->input_uV;
 708                 if (input_uV <= 0) {
 709                         rdev_err(rdev, "invalid input voltage found\n");
 710                         return -EINVAL;
 711                 }
 712
 713                 /* now get the optimum mode for our new total regulator load */
 714                 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 715                                                          output_uV, current_uA);
 716
 717                 /* check the new mode is allowed */
 718                 err = regulator_mode_constrain(rdev, &mode);
 719                 if (err < 0) {
 720                         rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
 721                                  current_uA, input_uV, output_uV);
 722                         return err;
 723                 }
 724
 725                 err = rdev->desc->ops->set_mode(rdev, mode);
 726                 if (err < 0)
 727                         rdev_err(rdev, "failed to set optimum mode %x\n", mode);
 728         }
 729
 730         return err;
 731 }
 732
 733 static int suspend_set_state(struct regulator_dev *rdev,
 734         struct regulator_state *rstate)
 735 {
 736         int ret = 0;
 737
 738         /* If we have no suspend mode configration don't set anything;
 739          * only warn if the driver implements set_suspend_voltage or
 740          * set_suspend_mode callback.
 741          */
 742         if (!rstate->enabled && !rstate->disabled) {
 743                 if (rdev->desc->ops->set_suspend_voltage ||
 744                     rdev->desc->ops->set_suspend_mode)
 745                         rdev_warn(rdev, "No configuration\n");
 746                 return 0;
 747         }
 748
 749         if (rstate->enabled && rstate->disabled) {
 750                 rdev_err(rdev, "invalid configuration\n");
 751                 return -EINVAL;
 752         }
 753
 754         if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
 755                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 756         else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
 757                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 758         else /* OK if set_suspend_enable or set_suspend_disable is NULL */
 759                 ret = 0;
 760
 761         if (ret < 0) {
 762                 rdev_err(rdev, "failed to enabled/disable\n");
 763                 return ret;
 764         }
 765
 766         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 767                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 768                 if (ret < 0) {
 769                         rdev_err(rdev, "failed to set voltage\n");
 770                         return ret;
 771                 }
 772         }
 773
 774         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 775                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 776                 if (ret < 0) {
 777                         rdev_err(rdev, "failed to set mode\n");
 778                         return ret;
 779                 }
 780         }
 781         return ret;
 782 }
 783
 784 /* locks held by caller */
 785 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 786 {
 787         if (!rdev->constraints)
 788                 return -EINVAL;
 789
 790         switch (state) {
 791         case PM_SUSPEND_STANDBY:
 792                 return suspend_set_state(rdev,
 793                         &rdev->constraints->state_standby);
 794         case PM_SUSPEND_MEM:
 795                 return suspend_set_state(rdev,
 796                         &rdev->constraints->state_mem);
 797         case PM_SUSPEND_MAX:
 798                 return suspend_set_state(rdev,
 799                         &rdev->constraints->state_disk);
 800         default:
 801                 return -EINVAL;
 802         }
 803 }
 804
 805 static void print_constraints(struct regulator_dev *rdev)
 806 {
 807         struct regulation_constraints *constraints = rdev->constraints;
 808         char buf[160] = "";
 809         size_t len = sizeof(buf) - 1;
 810         int count = 0;
 811         int ret;
 812
 813         if (constraints->min_uV && constraints->max_uV) {
 814                 if (constraints->min_uV == constraints->max_uV)
 815                         count += scnprintf(buf + count, len - count, "%d mV ",
 816                                            constraints->min_uV / 1000);
 817                 else
 818                         count += scnprintf(buf + count, len - count,
 819                                            "%d <--> %d mV ",
 820                                            constraints->min_uV / 1000,
 821                                            constraints->max_uV / 1000);
 822         }
 823
 824         if (!constraints->min_uV ||
 825             constraints->min_uV != constraints->max_uV) {
 826                 ret = _regulator_get_voltage(rdev);
 827                 if (ret > 0)
 828                         count += scnprintf(buf + count, len - count,
 829                                            "at %d mV ", ret / 1000);
 830         }
 831
 832         if (constraints->uV_offset)
 833                 count += scnprintf(buf + count, len - count, "%dmV offset ",
 834                                    constraints->uV_offset / 1000);
 835
 836         if (constraints->min_uA && constraints->max_uA) {
 837                 if (constraints->min_uA == constraints->max_uA)
 838                         count += scnprintf(buf + count, len - count, "%d mA ",
 839                                            constraints->min_uA / 1000);
 840                 else
 841                         count += scnprintf(buf + count, len - count,
 842                                            "%d <--> %d mA ",
 843                                            constraints->min_uA / 1000,
 844                                            constraints->max_uA / 1000);
 845         }
 846
 847         if (!constraints->min_uA ||
 848             constraints->min_uA != constraints->max_uA) {
 849                 ret = _regulator_get_current_limit(rdev);
 850                 if (ret > 0)
 851                         count += scnprintf(buf + count, len - count,
 852                                            "at %d mA ", ret / 1000);
 853         }
 854
 855         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 856                 count += scnprintf(buf + count, len - count, "fast ");
 857         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 858                 count += scnprintf(buf + count, len - count, "normal ");
 859         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 860                 count += scnprintf(buf + count, len - count, "idle ");
 861         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 862                 count += scnprintf(buf + count, len - count, "standby");
 863
 864         if (!count)
 865                 scnprintf(buf, len, "no parameters");
 866
 867         rdev_dbg(rdev, "%s\n", buf);
 868
 869         if ((constraints->min_uV != constraints->max_uV) &&
 870             !regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE))
 871                 rdev_warn(rdev,
 872                           "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
 873 }
 874
 875 static int machine_constraints_voltage(struct regulator_dev *rdev,
 876         struct regulation_constraints *constraints)
 877 {
 878         const struct regulator_ops *ops = rdev->desc->ops;
 879         int ret;
 880
 881         /* do we need to apply the constraint voltage */
 882         if (rdev->constraints->apply_uV &&
 883             rdev->constraints->min_uV && rdev->constraints->max_uV) {
 884                 int target_min, target_max;
 885                 int current_uV = _regulator_get_voltage(rdev);
 886                 if (current_uV < 0) {
 887                         rdev_err(rdev,
 888                                  "failed to get the current voltage(%d)\n",
 889                                  current_uV);
 890                         return current_uV;
 891                 }
 892
 893                 /*
 894                  * If we're below the minimum voltage move up to the
 895                  * minimum voltage, if we're above the maximum voltage
 896                  * then move down to the maximum.
 897                  */
 898                 target_min = current_uV;
 899                 target_max = current_uV;
 900
 901                 if (current_uV < rdev->constraints->min_uV) {
 902                         target_min = rdev->constraints->min_uV;
 903                         target_max = rdev->constraints->min_uV;
 904                 }
 905
 906                 if (current_uV > rdev->constraints->max_uV) {
 907                         target_min = rdev->constraints->max_uV;
 908                         target_max = rdev->constraints->max_uV;
 909                 }
 910
 911                 if (target_min != current_uV || target_max != current_uV) {
 912                         rdev_info(rdev, "Bringing %duV into %d-%duV\n",
 913                                   current_uV, target_min, target_max);
 914                         ret = _regulator_do_set_voltage(
 915                                 rdev, target_min, target_max);
 916                         if (ret < 0) {
 917                                 rdev_err(rdev,
 918                                         "failed to apply %d-%duV constraint(%d)\n",
 919                                         target_min, target_max, ret);
 920                                 return ret;
 921                         }
 922                 }
 923         }
 924
 925         /* constrain machine-level voltage specs to fit
 926          * the actual range supported by this regulator.
 927          */
 928         if (ops->list_voltage && rdev->desc->n_voltages) {
 929                 int     count = rdev->desc->n_voltages;
 930                 int     i;
 931                 int     min_uV = INT_MAX;
 932                 int     max_uV = INT_MIN;
 933                 int     cmin = constraints->min_uV;
 934                 int     cmax = constraints->max_uV;
 935
 936                 /* it's safe to autoconfigure fixed-voltage supplies
 937                    and the constraints are used by list_voltage. */
 938                 if (count == 1 && !cmin) {
 939                         cmin = 1;
 940                         cmax = INT_MAX;
 941                         constraints->min_uV = cmin;
 942                         constraints->max_uV = cmax;
 943                 }
 944
 945                 /* voltage constraints are optional */
 946                 if ((cmin == 0) && (cmax == 0))
 947                         return 0;
 948
 949                 /* else require explicit machine-level constraints */
 950                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 951                         rdev_err(rdev, "invalid voltage constraints\n");
 952                         return -EINVAL;
 953                 }
 954
 955                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 956                 for (i = 0; i < count; i++) {
 957                         int     value;
 958
 959                         value = ops->list_voltage(rdev, i);
 960                         if (value <= 0)
 961                                 continue;
 962
 963                         /* maybe adjust [min_uV..max_uV] */
 964                         if (value >= cmin && value < min_uV)
 965                                 min_uV = value;
 966                         if (value <= cmax && value > max_uV)
 967                                 max_uV = value;
 968                 }
 969
 970                 /* final: [min_uV..max_uV] valid iff constraints valid */
 971                 if (max_uV < min_uV) {
 972                         rdev_err(rdev,
 973                                  "unsupportable voltage constraints %u-%uuV\n",
 974                                  min_uV, max_uV);
 975                         return -EINVAL;
 976                 }
 977
 978                 /* use regulator's subset of machine constraints */
 979                 if (constraints->min_uV < min_uV) {
 980                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
 981                                  constraints->min_uV, min_uV);
 982                         constraints->min_uV = min_uV;
 983                 }
 984                 if (constraints->max_uV > max_uV) {
 985                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
 986                                  constraints->max_uV, max_uV);
 987                         constraints->max_uV = max_uV;
 988                 }
 989         }
 990
 991         return 0;
 992 }
 993
 994 static int machine_constraints_current(struct regulator_dev *rdev,
 995         struct regulation_constraints *constraints)
 996 {
 997         const struct regulator_ops *ops = rdev->desc->ops;
 998         int ret;
 999
1000         if (!constraints->min_uA && !constraints->max_uA)
1001                 return 0;
1002
1003         if (constraints->min_uA > constraints->max_uA) {
1004                 rdev_err(rdev, "Invalid current constraints\n");
1005                 return -EINVAL;
1006         }
1007
1008         if (!ops->set_current_limit || !ops->get_current_limit) {
1009                 rdev_warn(rdev, "Operation of current configuration missing\n");
1010                 return 0;
1011         }
1012
1013         /* Set regulator current in constraints range */
1014         ret = ops->set_current_limit(rdev, constraints->min_uA,
1015                         constraints->max_uA);
1016         if (ret < 0) {
1017                 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
1018                 return ret;
1019         }
1020
1021         return 0;
1022 }
1023
1024 static int _regulator_do_enable(struct regulator_dev *rdev);
1025
1026 /**
1027  * set_machine_constraints - sets regulator constraints
1028  * @rdev: regulator source
1029  * @constraints: constraints to apply
1030  *
1031  * Allows platform initialisation code to define and constrain
1032  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
1033  * Constraints *must* be set by platform code in order for some
1034  * regulator operations to proceed i.e. set_voltage, set_current_limit,
1035  * set_mode.
1036  */
1037 static int set_machine_constraints(struct regulator_dev *rdev,
1038         const struct regulation_constraints *constraints)
1039 {
1040         int ret = 0;
1041         const struct regulator_ops *ops = rdev->desc->ops;
1042
1043         if (constraints)
1044                 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
1045                                             GFP_KERNEL);
1046         else
1047                 rdev->constraints = kzalloc(sizeof(*constraints),
1048                                             GFP_KERNEL);
1049         if (!rdev->constraints)
1050                 return -ENOMEM;
1051
1052         ret = machine_constraints_voltage(rdev, rdev->constraints);
1053         if (ret != 0)
1054                 return ret;
1055
1056         ret = machine_constraints_current(rdev, rdev->constraints);
1057         if (ret != 0)
1058                 return ret;
1059
1060         if (rdev->constraints->ilim_uA && ops->set_input_current_limit) {
1061                 ret = ops->set_input_current_limit(rdev,
1062                                                    rdev->constraints->ilim_uA);
1063                 if (ret < 0) {
1064                         rdev_err(rdev, "failed to set input limit\n");
1065                         return ret;
1066                 }
1067         }
1068
1069         /* do we need to setup our suspend state */
1070         if (rdev->constraints->initial_state) {
1071                 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1072                 if (ret < 0) {
1073                         rdev_err(rdev, "failed to set suspend state\n");
1074                         return ret;
1075                 }
1076         }
1077
1078         if (rdev->constraints->initial_mode) {
1079                 if (!ops->set_mode) {
1080                         rdev_err(rdev, "no set_mode operation\n");
1081                         return -EINVAL;
1082                 }
1083
1084                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1085                 if (ret < 0) {
1086                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1087                         return ret;
1088                 }
1089         }
1090
1091         /* If the constraints say the regulator should be on at this point
1092          * and we have control then make sure it is enabled.
1093          */
1094         if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1095                 ret = _regulator_do_enable(rdev);
1096                 if (ret < 0 && ret != -EINVAL) {
1097                         rdev_err(rdev, "failed to enable\n");
1098                         return ret;
1099                 }
1100         }
1101
1102         if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1103                 && ops->set_ramp_delay) {
1104                 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1105                 if (ret < 0) {
1106                         rdev_err(rdev, "failed to set ramp_delay\n");
1107                         return ret;
1108                 }
1109         }
1110
1111         if (rdev->constraints->pull_down && ops->set_pull_down) {
1112                 ret = ops->set_pull_down(rdev);
1113                 if (ret < 0) {
1114                         rdev_err(rdev, "failed to set pull down\n");
1115                         return ret;
1116                 }
1117         }
1118
1119         if (rdev->constraints->soft_start && ops->set_soft_start) {
1120                 ret = ops->set_soft_start(rdev);
1121                 if (ret < 0) {
1122                         rdev_err(rdev, "failed to set soft start\n");
1123                         return ret;
1124                 }
1125         }
1126
1127         if (rdev->constraints->over_current_protection
1128                 && ops->set_over_current_protection) {
1129                 ret = ops->set_over_current_protection(rdev);
1130                 if (ret < 0) {
1131                         rdev_err(rdev, "failed to set over current protection\n");
1132                         return ret;
1133                 }
1134         }
1135
1136         if (rdev->constraints->active_discharge && ops->set_active_discharge) {
1137                 bool ad_state = (rdev->constraints->active_discharge ==
1138                               REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false;
1139
1140                 ret = ops->set_active_discharge(rdev, ad_state);
1141                 if (ret < 0) {
1142                         rdev_err(rdev, "failed to set active discharge\n");
1143                         return ret;
1144                 }
1145         }
1146
1147         print_constraints(rdev);
1148         return 0;
1149 }
1150
1151 /**
1152  * set_supply - set regulator supply regulator
1153  * @rdev: regulator name
1154  * @supply_rdev: supply regulator name
1155  *
1156  * Called by platform initialisation code to set the supply regulator for this
1157  * regulator. This ensures that a regulators supply will also be enabled by the
1158  * core if it's child is enabled.
1159  */
1160 static int set_supply(struct regulator_dev *rdev,
1161                       struct regulator_dev *supply_rdev)
1162 {
1163         int err;
1164
1165         rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1166
1167         if (!try_module_get(supply_rdev->owner))
1168                 return -ENODEV;
1169
1170         rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1171         if (rdev->supply == NULL) {
1172                 err = -ENOMEM;
1173                 return err;
1174         }
1175         supply_rdev->open_count++;
1176
1177         return 0;
1178 }
1179
1180 /**
1181  * set_consumer_device_supply - Bind a regulator to a symbolic supply
1182  * @rdev:         regulator source
1183  * @consumer_dev_name: dev_name() string for device supply applies to
1184  * @supply:       symbolic name for supply
1185  *
1186  * Allows platform initialisation code to map physical regulator
1187  * sources to symbolic names for supplies for use by devices.  Devices
1188  * should use these symbolic names to request regulators, avoiding the
1189  * need to provide board-specific regulator names as platform data.
1190  */
1191 static int set_consumer_device_supply(struct regulator_dev *rdev,
1192                                       const char *consumer_dev_name,
1193                                       const char *supply)
1194 {
1195         struct regulator_map *node;
1196         int has_dev;
1197
1198         if (supply == NULL)
1199                 return -EINVAL;
1200
1201         if (consumer_dev_name != NULL)
1202                 has_dev = 1;
1203         else
1204                 has_dev = 0;
1205
1206         list_for_each_entry(node, &regulator_map_list, list) {
1207                 if (node->dev_name && consumer_dev_name) {
1208                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
1209                                 continue;
1210                 } else if (node->dev_name || consumer_dev_name) {
1211                         continue;
1212                 }
1213
1214                 if (strcmp(node->supply, supply) != 0)
1215                         continue;
1216
1217                 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1218                          consumer_dev_name,
1219                          dev_name(&node->regulator->dev),
1220                          node->regulator->desc->name,
1221                          supply,
1222                          dev_name(&rdev->dev), rdev_get_name(rdev));
1223                 return -EBUSY;
1224         }
1225
1226         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1227         if (node == NULL)
1228                 return -ENOMEM;
1229
1230         node->regulator = rdev;
1231         node->supply = supply;
1232
1233         if (has_dev) {
1234                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1235                 if (node->dev_name == NULL) {
1236                         kfree(node);
1237                         return -ENOMEM;
1238                 }
1239         }
1240
1241         list_add(&node->list, &regulator_map_list);
1242         return 0;
1243 }
1244
1245 static void unset_regulator_supplies(struct regulator_dev *rdev)
1246 {
1247         struct regulator_map *node, *n;
1248
1249         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1250                 if (rdev == node->regulator) {
1251                         list_del(&node->list);
1252                         kfree(node->dev_name);
1253                         kfree(node);
1254                 }
1255         }
1256 }
1257
1258 #ifdef CONFIG_DEBUG_FS
1259 static ssize_t constraint_flags_read_file(struct file *file,
1260                                           char __user *user_buf,
1261                                           size_t count, loff_t *ppos)
1262 {
1263         const struct regulator *regulator = file->private_data;
1264         const struct regulation_constraints *c = regulator->rdev->constraints;
1265         char *buf;
1266         ssize_t ret;
1267
1268         if (!c)
1269                 return 0;
1270
1271         buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1272         if (!buf)
1273                 return -ENOMEM;
1274
1275         ret = snprintf(buf, PAGE_SIZE,
1276                         "always_on: %u\n"
1277                         "boot_on: %u\n"
1278                         "apply_uV: %u\n"
1279                         "ramp_disable: %u\n"
1280                         "soft_start: %u\n"
1281                         "pull_down: %u\n"
1282                         "over_current_protection: %u\n",
1283                         c->always_on,
1284                         c->boot_on,
1285                         c->apply_uV,
1286                         c->ramp_disable,
1287                         c->soft_start,
1288                         c->pull_down,
1289                         c->over_current_protection);
1290
1291         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
1292         kfree(buf);
1293
1294         return ret;
1295 }
1296
1297 #endif
1298
1299 static const struct file_operations constraint_flags_fops = {
1300 #ifdef CONFIG_DEBUG_FS
1301         .open = simple_open,
1302         .read = constraint_flags_read_file,
1303         .llseek = default_llseek,
1304 #endif
1305 };
1306
1307 #define REG_STR_SIZE    64
1308
1309 static struct regulator *create_regulator(struct regulator_dev *rdev,
1310                                           struct device *dev,
1311                                           const char *supply_name)
1312 {
1313         struct regulator *regulator;
1314         char buf[REG_STR_SIZE];
1315         int err, size;
1316
1317         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1318         if (regulator == NULL)
1319                 return NULL;
1320
1321         mutex_lock(&rdev->mutex);
1322         regulator->rdev = rdev;
1323         list_add(&regulator->list, &rdev->consumer_list);
1324
1325         if (dev) {
1326                 regulator->dev = dev;
1327
1328                 /* Add a link to the device sysfs entry */
1329                 size = snprintf(buf, REG_STR_SIZE, "%s-%s",
1330                                 dev->kobj.name, supply_name);
1331                 if (size >= REG_STR_SIZE)
1332                         goto overflow_err;
1333
1334                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1335                 if (regulator->supply_name == NULL)
1336                         goto overflow_err;
1337
1338                 err = sysfs_create_link_nowarn(&rdev->dev.kobj, &dev->kobj,
1339                                         buf);
1340                 if (err) {
1341                         rdev_dbg(rdev, "could not add device link %s err %d\n",
1342                                   dev->kobj.name, err);
1343                         /* non-fatal */
1344                 }
1345         } else {
1346                 regulator->supply_name = kstrdup_const(supply_name, GFP_KERNEL);
1347                 if (regulator->supply_name == NULL)
1348                         goto overflow_err;
1349         }
1350
1351         regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1352                                                 rdev->debugfs);
1353         if (!regulator->debugfs) {
1354                 rdev_dbg(rdev, "Failed to create debugfs directory\n");
1355         } else {
1356                 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1357                                    &regulator->uA_load);
1358                 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1359                                    &regulator->min_uV);
1360                 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1361                                    &regulator->max_uV);
1362                 debugfs_create_file("constraint_flags", 0444,
1363                                     regulator->debugfs, regulator,
1364                                     &constraint_flags_fops);
1365         }
1366
1367         /*
1368          * Check now if the regulator is an always on regulator - if
1369          * it is then we don't need to do nearly so much work for
1370          * enable/disable calls.
1371          */
1372         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS) &&
1373             _regulator_is_enabled(rdev))
1374                 regulator->always_on = true;
1375
1376         mutex_unlock(&rdev->mutex);
1377         return regulator;
1378 overflow_err:
1379         list_del(&regulator->list);
1380         kfree(regulator);
1381         mutex_unlock(&rdev->mutex);
1382         return NULL;
1383 }
1384
1385 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1386 {
1387         if (rdev->constraints && rdev->constraints->enable_time)
1388                 return rdev->constraints->enable_time;
1389         if (!rdev->desc->ops->enable_time)
1390                 return rdev->desc->enable_time;
1391         return rdev->desc->ops->enable_time(rdev);
1392 }
1393
1394 static struct regulator_supply_alias *regulator_find_supply_alias(
1395                 struct device *dev, const char *supply)
1396 {
1397         struct regulator_supply_alias *map;
1398
1399         list_for_each_entry(map, &regulator_supply_alias_list, list)
1400                 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1401                         return map;
1402
1403         return NULL;
1404 }
1405
1406 static void regulator_supply_alias(struct device **dev, const char **supply)
1407 {
1408         struct regulator_supply_alias *map;
1409
1410         map = regulator_find_supply_alias(*dev, *supply);
1411         if (map) {
1412                 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1413                                 *supply, map->alias_supply,
1414                                 dev_name(map->alias_dev));
1415                 *dev = map->alias_dev;
1416                 *supply = map->alias_supply;
1417         }
1418 }
1419
1420 static int of_node_match(struct device *dev, const void *data)
1421 {
1422         return dev->of_node == data;
1423 }
1424
1425 static struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
1426 {
1427         struct device *dev;
1428
1429         dev = class_find_device(&regulator_class, NULL, np, of_node_match);
1430
1431         return dev ? dev_to_rdev(dev) : NULL;
1432 }
1433
1434 static int regulator_match(struct device *dev, const void *data)
1435 {
1436         struct regulator_dev *r = dev_to_rdev(dev);
1437
1438         return strcmp(rdev_get_name(r), data) == 0;
1439 }
1440
1441 static struct regulator_dev *regulator_lookup_by_name(const char *name)
1442 {
1443         struct device *dev;
1444
1445         dev = class_find_device(&regulator_class, NULL, name, regulator_match);
1446
1447         return dev ? dev_to_rdev(dev) : NULL;
1448 }
1449
1450 /**
1451  * regulator_dev_lookup - lookup a regulator device.
1452  * @dev: device for regulator "consumer".
1453  * @supply: Supply name or regulator ID.
1454  *
1455  * If successful, returns a struct regulator_dev that corresponds to the name
1456  * @supply and with the embedded struct device refcount incremented by one.
1457  * The refcount must be dropped by calling put_device().
1458  * On failure one of the following ERR-PTR-encoded values is returned:
1459  * -ENODEV if lookup fails permanently, -EPROBE_DEFER if lookup could succeed
1460  * in the future.
1461  */
1462 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1463                                                   const char *supply)
1464 {
1465         struct regulator_dev *r;
1466         struct device_node *node;
1467         struct regulator_map *map;
1468         const char *devname = NULL;
1469
1470         regulator_supply_alias(&dev, &supply);
1471
1472         /* first do a dt based lookup */
1473         if (dev && dev->of_node) {
1474                 node = of_get_regulator(dev, supply);
1475                 if (node) {
1476                         r = of_find_regulator_by_node(node);
1477                         if (r)
1478                                 return r;
1479
1480                         /*
1481                          * We have a node, but there is no device.
1482                          * assume it has not registered yet.
1483                          */
1484                         return ERR_PTR(-EPROBE_DEFER);
1485                 }
1486         }
1487
1488         /* if not found, try doing it non-dt way */
1489         if (dev)
1490                 devname = dev_name(dev);
1491
1492         r = regulator_lookup_by_name(supply);
1493         if (r)
1494                 return r;
1495
1496         mutex_lock(&regulator_list_mutex);
1497         list_for_each_entry(map, &regulator_map_list, list) {
1498                 /* If the mapping has a device set up it must match */
1499                 if (map->dev_name &&
1500                     (!devname || strcmp(map->dev_name, devname)))
1501                         continue;
1502
1503                 if (strcmp(map->supply, supply) == 0 &&
1504                     get_device(&map->regulator->dev)) {
1505                         r = map->regulator;
1506                         break;
1507                 }
1508         }
1509         mutex_unlock(&regulator_list_mutex);
1510
1511         if (r)
1512                 return r;
1513
1514         return ERR_PTR(-ENODEV);
1515 }
1516
1517 static int regulator_resolve_supply(struct regulator_dev *rdev)
1518 {
1519         struct regulator_dev *r;
1520         struct device *dev = rdev->dev.parent;
1521         int ret;
1522
1523         /* No supply to resovle? */
1524         if (!rdev->supply_name)
1525                 return 0;
1526
1527         /* Supply already resolved? */
1528         if (rdev->supply)
1529                 return 0;
1530
1531         r = regulator_dev_lookup(dev, rdev->supply_name);
1532         if (IS_ERR(r)) {
1533                 ret = PTR_ERR(r);
1534
1535                 /* Did the lookup explicitly defer for us? */
1536                 if (ret == -EPROBE_DEFER)
1537                         return ret;
1538
1539                 if (have_full_constraints()) {
1540                         r = dummy_regulator_rdev;
1541                         get_device(&r->dev);
1542                 } else {
1543                         dev_err(dev, "Failed to resolve %s-supply for %s\n",
1544                                 rdev->supply_name, rdev->desc->name);
1545                         return -EPROBE_DEFER;
1546                 }
1547         }
1548
1549         /*
1550          * If the supply's parent device is not the same as the
1551          * regulator's parent device, then ensure the parent device
1552          * is bound before we resolve the supply, in case the parent
1553          * device get probe deferred and unregisters the supply.
1554          */
1555         if (r->dev.parent && r->dev.parent != rdev->dev.parent) {
1556                 if (!device_is_bound(r->dev.parent)) {
1557                         put_device(&r->dev);
1558                         return -EPROBE_DEFER;
1559                 }
1560         }
1561
1562         /* Recursively resolve the supply of the supply */
1563         ret = regulator_resolve_supply(r);
1564         if (ret < 0) {
1565                 put_device(&r->dev);
1566                 return ret;
1567         }
1568
1569         ret = set_supply(rdev, r);
1570         if (ret < 0) {
1571                 put_device(&r->dev);
1572                 return ret;
1573         }
1574
1575         /* Cascade always-on state to supply */
1576         if (_regulator_is_enabled(rdev)) {
1577                 ret = regulator_enable(rdev->supply);
1578                 if (ret < 0) {
1579                         _regulator_put(rdev->supply);
1580                         rdev->supply = NULL;
1581                         return ret;
1582                 }
1583         }
1584
1585         return 0;
1586 }
1587
1588 /* Internal regulator request function */
1589 struct regulator *_regulator_get(struct device *dev, const char *id,
1590                                  enum regulator_get_type get_type)
1591 {
1592         struct regulator_dev *rdev;
1593         struct regulator *regulator;
1594         const char *devname = dev ? dev_name(dev) : "deviceless";
1595         int ret;
1596
1597         if (get_type >= MAX_GET_TYPE) {
1598                 dev_err(dev, "invalid type %d in %s\n", get_type, __func__);
1599                 return ERR_PTR(-EINVAL);
1600         }
1601
1602         if (id == NULL) {
1603                 pr_err("get() with no identifier\n");
1604                 return ERR_PTR(-EINVAL);
1605         }
1606
1607         rdev = regulator_dev_lookup(dev, id);
1608         if (IS_ERR(rdev)) {
1609                 ret = PTR_ERR(rdev);
1610
1611                 /*
1612                  * If regulator_dev_lookup() fails with error other
1613                  * than -ENODEV our job here is done, we simply return it.
1614                  */
1615                 if (ret != -ENODEV)
1616                         return ERR_PTR(ret);
1617
1618                 if (!have_full_constraints()) {
1619                         dev_warn(dev,
1620                                  "incomplete constraints, dummy supplies not allowed\n");
1621                         return ERR_PTR(-ENODEV);
1622                 }
1623
1624                 switch (get_type) {
1625                 case NORMAL_GET:
1626                         /*
1627                          * Assume that a regulator is physically present and
1628                          * enabled, even if it isn't hooked up, and just
1629                          * provide a dummy.
1630                          */
1631                         dev_warn(dev,
1632                                  "%s supply %s not found, using dummy regulator\n",
1633                                  devname, id);
1634                         rdev = dummy_regulator_rdev;
1635                         get_device(&rdev->dev);
1636                         break;
1637
1638                 case EXCLUSIVE_GET:
1639                         dev_warn(dev,
1640                                  "dummy supplies not allowed for exclusive requests\n");
1641                         /* fall through */
1642
1643                 default:
1644                         return ERR_PTR(-ENODEV);
1645                 }
1646         }
1647
1648         if (rdev->exclusive) {
1649                 regulator = ERR_PTR(-EPERM);
1650                 put_device(&rdev->dev);
1651                 return regulator;
1652         }
1653
1654         if (get_type == EXCLUSIVE_GET && rdev->open_count) {
1655                 regulator = ERR_PTR(-EBUSY);
1656                 put_device(&rdev->dev);
1657                 return regulator;
1658         }
1659
1660         ret = regulator_resolve_supply(rdev);
1661         if (ret < 0) {
1662                 regulator = ERR_PTR(ret);
1663                 put_device(&rdev->dev);
1664                 return regulator;
1665         }
1666
1667         if (!try_module_get(rdev->owner)) {
1668                 regulator = ERR_PTR(-EPROBE_DEFER);
1669                 put_device(&rdev->dev);
1670                 return regulator;
1671         }
1672
1673         regulator = create_regulator(rdev, dev, id);
1674         if (regulator == NULL) {
1675                 regulator = ERR_PTR(-ENOMEM);
1676                 put_device(&rdev->dev);
1677                 module_put(rdev->owner);
1678                 return regulator;
1679         }
1680
1681         rdev->open_count++;
1682         if (get_type == EXCLUSIVE_GET) {
1683                 rdev->exclusive = 1;
1684
1685                 ret = _regulator_is_enabled(rdev);
1686                 if (ret > 0)
1687                         rdev->use_count = 1;
1688                 else
1689                         rdev->use_count = 0;
1690         }
1691
1692         return regulator;
1693 }
1694
1695 /**
1696  * regulator_get - lookup and obtain a reference to a regulator.
1697  * @dev: device for regulator "consumer"
1698  * @id: Supply name or regulator ID.
1699  *
1700  * Returns a struct regulator corresponding to the regulator producer,
1701  * or IS_ERR() condition containing errno.
1702  *
1703  * Use of supply names configured via regulator_set_device_supply() is
1704  * strongly encouraged.  It is recommended that the supply name used
1705  * should match the name used for the supply and/or the relevant
1706  * device pins in the datasheet.
1707  */
1708 struct regulator *regulator_get(struct device *dev, const char *id)
1709 {
1710         return _regulator_get(dev, id, NORMAL_GET);
1711 }
1712 EXPORT_SYMBOL_GPL(regulator_get);
1713
1714 /**
1715  * regulator_get_exclusive - obtain exclusive access to a regulator.
1716  * @dev: device for regulator "consumer"
1717  * @id: Supply name or regulator ID.
1718  *
1719  * Returns a struct regulator corresponding to the regulator producer,
1720  * or IS_ERR() condition containing errno.  Other consumers will be
1721  * unable to obtain this regulator while this reference is held and the
1722  * use count for the regulator will be initialised to reflect the current
1723  * state of the regulator.
1724  *
1725  * This is intended for use by consumers which cannot tolerate shared
1726  * use of the regulator such as those which need to force the
1727  * regulator off for correct operation of the hardware they are
1728  * controlling.
1729  *
1730  * Use of supply names configured via regulator_set_device_supply() is
1731  * strongly encouraged.  It is recommended that the supply name used
1732  * should match the name used for the supply and/or the relevant
1733  * device pins in the datasheet.
1734  */
1735 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1736 {
1737         return _regulator_get(dev, id, EXCLUSIVE_GET);
1738 }
1739 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1740
1741 /**
1742  * regulator_get_optional - obtain optional access to a regulator.
1743  * @dev: device for regulator "consumer"
1744  * @id: Supply name or regulator ID.
1745  *
1746  * Returns a struct regulator corresponding to the regulator producer,
1747  * or IS_ERR() condition containing errno.
1748  *
1749  * This is intended for use by consumers for devices which can have
1750  * some supplies unconnected in normal use, such as some MMC devices.
1751  * It can allow the regulator core to provide stub supplies for other
1752  * supplies requested using normal regulator_get() calls without
1753  * disrupting the operation of drivers that can handle absent
1754  * supplies.
1755  *
1756  * Use of supply names configured via regulator_set_device_supply() is
1757  * strongly encouraged.  It is recommended that the supply name used
1758  * should match the name used for the supply and/or the relevant
1759  * device pins in the datasheet.
1760  */
1761 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1762 {
1763         return _regulator_get(dev, id, OPTIONAL_GET);
1764 }
1765 EXPORT_SYMBOL_GPL(regulator_get_optional);
1766
1767 /* regulator_list_mutex lock held by regulator_put() */
1768 static void _regulator_put(struct regulator *regulator)
1769 {
1770         struct regulator_dev *rdev;
1771
1772         if (IS_ERR_OR_NULL(regulator))
1773                 return;
1774
1775         lockdep_assert_held_once(&regulator_list_mutex);
1776
1777         rdev = regulator->rdev;
1778
1779         debugfs_remove_recursive(regulator->debugfs);
1780
1781         /* remove any sysfs entries */
1782         if (regulator->dev)
1783                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1784         mutex_lock(&rdev->mutex);
1785         list_del(&regulator->list);
1786
1787         rdev->open_count--;
1788         rdev->exclusive = 0;
1789         put_device(&rdev->dev);
1790         mutex_unlock(&rdev->mutex);
1791
1792         kfree_const(regulator->supply_name);
1793         kfree(regulator);
1794
1795         module_put(rdev->owner);
1796 }
1797
1798 /**
1799  * regulator_put - "free" the regulator source
1800  * @regulator: regulator source
1801  *
1802  * Note: drivers must ensure that all regulator_enable calls made on this
1803  * regulator source are balanced by regulator_disable calls prior to calling
1804  * this function.
1805  */
1806 void regulator_put(struct regulator *regulator)
1807 {
1808         mutex_lock(&regulator_list_mutex);
1809         _regulator_put(regulator);
1810         mutex_unlock(&regulator_list_mutex);
1811 }
1812 EXPORT_SYMBOL_GPL(regulator_put);
1813
1814 /**
1815  * regulator_register_supply_alias - Provide device alias for supply lookup
1816  *
1817  * @dev: device that will be given as the regulator "consumer"
1818  * @id: Supply name or regulator ID
1819  * @alias_dev: device that should be used to lookup the supply
1820  * @alias_id: Supply name or regulator ID that should be used to lookup the
1821  * supply
1822  *
1823  * All lookups for id on dev will instead be conducted for alias_id on
1824  * alias_dev.
1825  */
1826 int regulator_register_supply_alias(struct device *dev, const char *id,
1827                                     struct device *alias_dev,
1828                                     const char *alias_id)
1829 {
1830         struct regulator_supply_alias *map;
1831
1832         map = regulator_find_supply_alias(dev, id);
1833         if (map)
1834                 return -EEXIST;
1835
1836         map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1837         if (!map)
1838                 return -ENOMEM;
1839
1840         map->src_dev = dev;
1841         map->src_supply = id;
1842         map->alias_dev = alias_dev;
1843         map->alias_supply = alias_id;
1844
1845         list_add(&map->list, &regulator_supply_alias_list);
1846
1847         pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1848                 id, dev_name(dev), alias_id, dev_name(alias_dev));
1849
1850         return 0;
1851 }
1852 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1853
1854 /**
1855  * regulator_unregister_supply_alias - Remove device alias
1856  *
1857  * @dev: device that will be given as the regulator "consumer"
1858  * @id: Supply name or regulator ID
1859  *
1860  * Remove a lookup alias if one exists for id on dev.
1861  */
1862 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1863 {
1864         struct regulator_supply_alias *map;
1865
1866         map = regulator_find_supply_alias(dev, id);
1867         if (map) {
1868                 list_del(&map->list);
1869                 kfree(map);
1870         }
1871 }
1872 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1873
1874 /**
1875  * regulator_bulk_register_supply_alias - register multiple aliases
1876  *
1877  * @dev: device that will be given as the regulator "consumer"
1878  * @id: List of supply names or regulator IDs
1879  * @alias_dev: device that should be used to lookup the supply
1880  * @alias_id: List of supply names or regulator IDs that should be used to
1881  * lookup the supply
1882  * @num_id: Number of aliases to register
1883  *
1884  * @return 0 on success, an errno on failure.
1885  *
1886  * This helper function allows drivers to register several supply
1887  * aliases in one operation.  If any of the aliases cannot be
1888  * registered any aliases that were registered will be removed
1889  * before returning to the caller.
1890  */
1891 int regulator_bulk_register_supply_alias(struct device *dev,
1892                                          const char *const *id,
1893                                          struct device *alias_dev,
1894                                          const char *const *alias_id,
1895                                          int num_id)
1896 {
1897         int i;
1898         int ret;
1899
1900         for (i = 0; i < num_id; ++i) {
1901                 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1902                                                       alias_id[i]);
1903                 if (ret < 0)
1904                         goto err;
1905         }
1906
1907         return 0;
1908
1909 err:
1910         dev_err(dev,
1911                 "Failed to create supply alias %s,%s -> %s,%s\n",
1912                 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1913
1914         while (--i >= 0)
1915                 regulator_unregister_supply_alias(dev, id[i]);
1916
1917         return ret;
1918 }
1919 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1920
1921 /**
1922  * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1923  *
1924  * @dev: device that will be given as the regulator "consumer"
1925  * @id: List of supply names or regulator IDs
1926  * @num_id: Number of aliases to unregister
1927  *
1928  * This helper function allows drivers to unregister several supply
1929  * aliases in one operation.
1930  */
1931 void regulator_bulk_unregister_supply_alias(struct device *dev,
1932                                             const char *const *id,
1933                                             int num_id)
1934 {
1935         int i;
1936
1937         for (i = 0; i < num_id; ++i)
1938                 regulator_unregister_supply_alias(dev, id[i]);
1939 }
1940 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1941
1942
1943 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1944 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1945                                 const struct regulator_config *config)
1946 {
1947         struct regulator_enable_gpio *pin;
1948         struct gpio_desc *gpiod;
1949         int ret;
1950
1951         gpiod = gpio_to_desc(config->ena_gpio);
1952
1953         list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
1954                 if (pin->gpiod == gpiod) {
1955                         rdev_dbg(rdev, "GPIO %d is already used\n",
1956                                 config->ena_gpio);
1957                         goto update_ena_gpio_to_rdev;
1958                 }
1959         }
1960
1961         ret = gpio_request_one(config->ena_gpio,
1962                                 GPIOF_DIR_OUT | config->ena_gpio_flags,
1963                                 rdev_get_name(rdev));
1964         if (ret)
1965                 return ret;
1966
1967         pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1968         if (pin == NULL) {
1969                 gpio_free(config->ena_gpio);
1970                 return -ENOMEM;
1971         }
1972
1973         pin->gpiod = gpiod;
1974         pin->ena_gpio_invert = config->ena_gpio_invert;
1975         list_add(&pin->list, &regulator_ena_gpio_list);
1976
1977 update_ena_gpio_to_rdev:
1978         pin->request_count++;
1979         rdev->ena_pin = pin;
1980         return 0;
1981 }
1982
1983 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1984 {
1985         struct regulator_enable_gpio *pin, *n;
1986
1987         if (!rdev->ena_pin)
1988                 return;
1989
1990         /* Free the GPIO only in case of no use */
1991         list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
1992                 if (pin->gpiod == rdev->ena_pin->gpiod) {
1993                         if (pin->request_count <= 1) {
1994                                 pin->request_count = 0;
1995                                 gpiod_put(pin->gpiod);
1996                                 list_del(&pin->list);
1997                                 kfree(pin);
1998                                 rdev->ena_pin = NULL;
1999                                 return;
2000                         } else {
2001                                 pin->request_count--;
2002                         }
2003                 }
2004         }
2005 }
2006
2007 /**
2008  * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
2009  * @rdev: regulator_dev structure
2010  * @enable: enable GPIO at initial use?
2011  *
2012  * GPIO is enabled in case of initial use. (enable_count is 0)
2013  * GPIO is disabled when it is not shared any more. (enable_count <= 1)
2014  */
2015 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
2016 {
2017         struct regulator_enable_gpio *pin = rdev->ena_pin;
2018
2019         if (!pin)
2020                 return -EINVAL;
2021
2022         if (enable) {
2023                 /* Enable GPIO at initial use */
2024                 if (pin->enable_count == 0)
2025                         gpiod_set_value_cansleep(pin->gpiod,
2026                                                  !pin->ena_gpio_invert);
2027
2028                 pin->enable_count++;
2029         } else {
2030                 if (pin->enable_count > 1) {
2031                         pin->enable_count--;
2032                         return 0;
2033                 }
2034
2035                 /* Disable GPIO if not used */
2036                 if (pin->enable_count <= 1) {
2037                         gpiod_set_value_cansleep(pin->gpiod,
2038                                                  pin->ena_gpio_invert);
2039                         pin->enable_count = 0;
2040                 }
2041         }
2042
2043         return 0;
2044 }
2045
2046 /**
2047  * _regulator_enable_delay - a delay helper function
2048  * @delay: time to delay in microseconds
2049  *
2050  * Delay for the requested amount of time as per the guidelines in:
2051  *
2052  *     Documentation/timers/timers-howto.txt
2053  *
2054  * The assumption here is that regulators will never be enabled in
2055  * atomic context and therefore sleeping functions can be used.
2056  */
2057 static void _regulator_enable_delay(unsigned int delay)
2058 {
2059         unsigned int ms = delay / 1000;
2060         unsigned int us = delay % 1000;
2061
2062         if (ms > 0) {
2063                 /*
2064                  * For small enough values, handle super-millisecond
2065                  * delays in the usleep_range() call below.
2066                  */
2067                 if (ms < 20)
2068                         us += ms * 1000;
2069                 else
2070                         msleep(ms);
2071         }
2072
2073         /*
2074          * Give the scheduler some room to coalesce with any other
2075          * wakeup sources. For delays shorter than 10 us, don't even
2076          * bother setting up high-resolution timers and just busy-
2077          * loop.
2078          */
2079         if (us >= 10)
2080                 usleep_range(us, us + 100);
2081         else
2082                 udelay(us);
2083 }
2084
2085 static int _regulator_do_enable(struct regulator_dev *rdev)
2086 {
2087         int ret, delay;
2088
2089         /* Query before enabling in case configuration dependent.  */
2090         ret = _regulator_get_enable_time(rdev);
2091         if (ret >= 0) {
2092                 delay = ret;
2093         } else {
2094                 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
2095                 delay = 0;
2096         }
2097
2098         trace_regulator_enable(rdev_get_name(rdev));
2099
2100         if (rdev->desc->off_on_delay) {
2101                 /* if needed, keep a distance of off_on_delay from last time
2102                  * this regulator was disabled.
2103                  */
2104                 unsigned long start_jiffy = jiffies;
2105                 unsigned long intended, max_delay, remaining;
2106
2107                 max_delay = usecs_to_jiffies(rdev->desc->off_on_delay);
2108                 intended = rdev->last_off_jiffy + max_delay;
2109
2110                 if (time_before(start_jiffy, intended)) {
2111                         /* calc remaining jiffies to deal with one-time
2112                          * timer wrapping.
2113                          * in case of multiple timer wrapping, either it can be
2114                          * detected by out-of-range remaining, or it cannot be
2115                          * detected and we gets a panelty of
2116                          * _regulator_enable_delay().
2117                          */
2118                         remaining = intended - start_jiffy;
2119                         if (remaining <= max_delay)
2120                                 _regulator_enable_delay(
2121                                                 jiffies_to_usecs(remaining));
2122                 }
2123         }
2124
2125         if (rdev->ena_pin) {
2126                 if (!rdev->ena_gpio_state) {
2127                         ret = regulator_ena_gpio_ctrl(rdev, true);
2128                         if (ret < 0)
2129                                 return ret;
2130                         rdev->ena_gpio_state = 1;
2131                 }
2132         } else if (rdev->desc->ops->enable) {
2133                 ret = rdev->desc->ops->enable(rdev);
2134                 if (ret < 0)
2135                         return ret;
2136         } else {
2137                 return -EINVAL;
2138         }
2139
2140         /* Allow the regulator to ramp; it would be useful to extend
2141          * this for bulk operations so that the regulators can ramp
2142          * together.  */
2143         trace_regulator_enable_delay(rdev_get_name(rdev));
2144
2145         _regulator_enable_delay(delay);
2146
2147         trace_regulator_enable_complete(rdev_get_name(rdev));
2148
2149         return 0;
2150 }
2151
2152 /* locks held by regulator_enable() */
2153 static int _regulator_enable(struct regulator_dev *rdev)
2154 {
2155         int ret;
2156
2157         lockdep_assert_held_once(&rdev->mutex);
2158
2159         /* check voltage and requested load before enabling */
2160         if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2161                 drms_uA_update(rdev);
2162
2163         if (rdev->use_count == 0) {
2164                 /* The regulator may on if it's not switchable or left on */
2165                 ret = _regulator_is_enabled(rdev);
2166                 if (ret == -EINVAL || ret == 0) {
2167                         if (!regulator_ops_is_valid(rdev,
2168                                         REGULATOR_CHANGE_STATUS))
2169                                 return -EPERM;
2170
2171                         ret = _regulator_do_enable(rdev);
2172                         if (ret < 0)
2173                                 return ret;
2174
2175                         _notifier_call_chain(rdev, REGULATOR_EVENT_ENABLE,
2176                                              NULL);
2177                 } else if (ret < 0) {
2178                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
2179                         return ret;
2180                 }
2181                 /* Fallthrough on positive return values - already enabled */
2182         }
2183
2184         rdev->use_count++;
2185
2186         return 0;
2187 }
2188
2189 /**
2190  * regulator_enable - enable regulator output
2191  * @regulator: regulator source
2192  *
2193  * Request that the regulator be enabled with the regulator output at
2194  * the predefined voltage or current value.  Calls to regulator_enable()
2195  * must be balanced with calls to regulator_disable().
2196  *
2197  * NOTE: the output value can be set by other drivers, boot loader or may be
2198  * hardwired in the regulator.
2199  */
2200 int regulator_enable(struct regulator *regulator)
2201 {
2202         struct regulator_dev *rdev = regulator->rdev;
2203         int ret = 0;
2204
2205         if (regulator->always_on)
2206                 return 0;
2207
2208         if (rdev->supply) {
2209                 ret = regulator_enable(rdev->supply);
2210                 if (ret != 0)
2211                         return ret;
2212         }
2213
2214         mutex_lock(&rdev->mutex);
2215         ret = _regulator_enable(rdev);
2216         mutex_unlock(&rdev->mutex);
2217
2218         if (ret != 0 && rdev->supply)
2219                 regulator_disable(rdev->supply);
2220
2221         return ret;
2222 }
2223 EXPORT_SYMBOL_GPL(regulator_enable);
2224
2225 static int _regulator_do_disable(struct regulator_dev *rdev)
2226 {
2227         int ret;
2228
2229         trace_regulator_disable(rdev_get_name(rdev));
2230
2231         if (rdev->ena_pin) {
2232                 if (rdev->ena_gpio_state) {
2233                         ret = regulator_ena_gpio_ctrl(rdev, false);
2234                         if (ret < 0)
2235                                 return ret;
2236                         rdev->ena_gpio_state = 0;
2237                 }
2238
2239         } else if (rdev->desc->ops->disable) {
2240                 ret = rdev->desc->ops->disable(rdev);
2241                 if (ret != 0)
2242                         return ret;
2243         }
2244
2245         /* cares about last_off_jiffy only if off_on_delay is required by
2246          * device.
2247          */
2248         if (rdev->desc->off_on_delay)
2249                 rdev->last_off_jiffy = jiffies;
2250
2251         trace_regulator_disable_complete(rdev_get_name(rdev));
2252
2253         return 0;
2254 }
2255
2256 /* locks held by regulator_disable() */
2257 static int _regulator_disable(struct regulator_dev *rdev)
2258 {
2259         int ret = 0;
2260
2261         lockdep_assert_held_once(&rdev->mutex);
2262
2263         if (WARN(rdev->use_count <= 0,
2264                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
2265                 return -EIO;
2266
2267         /* are we the last user and permitted to disable ? */
2268         if (rdev->use_count == 1 &&
2269             (rdev->constraints && !rdev->constraints->always_on)) {
2270
2271                 /* we are last user */
2272                 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS)) {
2273                         ret = _notifier_call_chain(rdev,
2274                                                    REGULATOR_EVENT_PRE_DISABLE,
2275                                                    NULL);
2276                         if (ret & NOTIFY_STOP_MASK)
2277                                 return -EINVAL;
2278
2279                         ret = _regulator_do_disable(rdev);
2280                         if (ret < 0) {
2281                                 rdev_err(rdev, "failed to disable\n");
2282                                 _notifier_call_chain(rdev,
2283                                                 REGULATOR_EVENT_ABORT_DISABLE,
2284                                                 NULL);
2285                                 return ret;
2286                         }
2287                         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
2288                                         NULL);
2289                 }
2290
2291                 rdev->use_count = 0;
2292         } else if (rdev->use_count > 1) {
2293                 if (regulator_ops_is_valid(rdev, REGULATOR_CHANGE_DRMS))
2294                         drms_uA_update(rdev);
2295
2296                 rdev->use_count--;
2297         }
2298
2299         return ret;
2300 }
2301
2302 /**
2303  * regulator_disable - disable regulator output
2304  * @regulator: regulator source
2305  *
2306  * Disable the regulator output voltage or current.  Calls to
2307  * regulator_enable() must be balanced with calls to
2308  * regulator_disable().
2309  *
2310  * NOTE: this will only disable the regulator output if no other consumer
2311  * devices have it enabled, the regulator device supports disabling and
2312  * machine constraints permit this operation.
2313  */
2314 int regulator_disable(struct regulator *regulator)
2315 {
2316         struct regulator_dev *rdev = regulator->rdev;
2317         int ret = 0;
2318
2319         if (regulator->always_on)
2320                 return 0;
2321
2322         mutex_lock(&rdev->mutex);
2323         ret = _regulator_disable(rdev);
2324         mutex_unlock(&rdev->mutex);
2325
2326         if (ret == 0 && rdev->supply)
2327                 regulator_disable(rdev->supply);
2328
2329         return ret;
2330 }
2331 EXPORT_SYMBOL_GPL(regulator_disable);
2332
2333 /* locks held by regulator_force_disable() */
2334 static int _regulator_force_disable(struct regulator_dev *rdev)
2335 {
2336         int ret = 0;
2337
2338         lockdep_assert_held_once(&rdev->mutex);
2339
2340         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2341                         REGULATOR_EVENT_PRE_DISABLE, NULL);
2342         if (ret & NOTIFY_STOP_MASK)
2343                 return -EINVAL;
2344
2345         ret = _regulator_do_disable(rdev);
2346         if (ret < 0) {
2347                 rdev_err(rdev, "failed to force disable\n");
2348                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2349                                 REGULATOR_EVENT_ABORT_DISABLE, NULL);
2350                 return ret;
2351         }
2352
2353         _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2354                         REGULATOR_EVENT_DISABLE, NULL);
2355
2356         return 0;
2357 }
2358
2359 /**
2360  * regulator_force_disable - force disable regulator output
2361  * @regulator: regulator source
2362  *
2363  * Forcibly disable the regulator output voltage or current.
2364  * NOTE: this *will* disable the regulator output even if other consumer
2365  * devices have it enabled. This should be used for situations when device
2366  * damage will likely occur if the regulator is not disabled (e.g. over temp).
2367  */
2368 int regulator_force_disable(struct regulator *regulator)
2369 {
2370         struct regulator_dev *rdev = regulator->rdev;
2371         int ret;
2372
2373         mutex_lock(&rdev->mutex);
2374         regulator->uA_load = 0;
2375         ret = _regulator_force_disable(regulator->rdev);
2376         mutex_unlock(&rdev->mutex);
2377
2378         if (rdev->supply)
2379                 while (rdev->open_count--)
2380                         regulator_disable(rdev->supply);
2381
2382         return ret;
2383 }
2384 EXPORT_SYMBOL_GPL(regulator_force_disable);
2385
2386 static void regulator_disable_work(struct work_struct *work)
2387 {
2388         struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2389                                                   disable_work.work);
2390         int count, i, ret;
2391
2392         mutex_lock(&rdev->mutex);
2393
2394         BUG_ON(!rdev->deferred_disables);
2395
2396         count = rdev->deferred_disables;
2397         rdev->deferred_disables = 0;
2398
2399         for (i = 0; i < count; i++) {
2400                 ret = _regulator_disable(rdev);
2401                 if (ret != 0)
2402                         rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2403         }
2404
2405         mutex_unlock(&rdev->mutex);
2406
2407         if (rdev->supply) {
2408                 for (i = 0; i < count; i++) {
2409                         ret = regulator_disable(rdev->supply);
2410                         if (ret != 0) {
2411                                 rdev_err(rdev,
2412                                          "Supply disable failed: %d\n", ret);
2413                         }
2414                 }
2415         }
2416 }
2417
2418 /**
2419  * regulator_disable_deferred - disable regulator output with delay
2420  * @regulator: regulator source
2421  * @ms: miliseconds until the regulator is disabled
2422  *
2423  * Execute regulator_disable() on the regulator after a delay.  This
2424  * is intended for use with devices that require some time to quiesce.
2425  *
2426  * NOTE: this will only disable the regulator output if no other consumer
2427  * devices have it enabled, the regulator device supports disabling and
2428  * machine constraints permit this operation.
2429  */
2430 int regulator_disable_deferred(struct regulator *regulator, int ms)
2431 {
2432         struct regulator_dev *rdev = regulator->rdev;
2433
2434         if (regulator->always_on)
2435                 return 0;
2436
2437         if (!ms)
2438                 return regulator_disable(regulator);
2439
2440         mutex_lock(&rdev->mutex);
2441         rdev->deferred_disables++;
2442         mutex_unlock(&rdev->mutex);
2443
2444         queue_delayed_work(system_power_efficient_wq, &rdev->disable_work,
2445                            msecs_to_jiffies(ms));
2446         return 0;
2447 }
2448 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2449
2450 static int _regulator_is_enabled(struct regulator_dev *rdev)
2451 {
2452         /* A GPIO control always takes precedence */
2453         if (rdev->ena_pin)
2454                 return rdev->ena_gpio_state;
2455
2456         /* If we don't know then assume that the regulator is always on */
2457         if (!rdev->desc->ops->is_enabled)
2458                 return 1;
2459
2460         return rdev->desc->ops->is_enabled(rdev);
2461 }
2462
2463 static int _regulator_list_voltage(struct regulator *regulator,
2464                                     unsigned selector, int lock)
2465 {
2466         struct regulator_dev *rdev = regulator->rdev;
2467         const struct regulator_ops *ops = rdev->desc->ops;
2468         int ret;
2469
2470         if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2471                 return rdev->desc->fixed_uV;
2472
2473         if (ops->list_voltage) {
2474                 if (selector >= rdev->desc->n_voltages)
2475                         return -EINVAL;
2476                 if (lock)
2477                         mutex_lock(&rdev->mutex);
2478                 ret = ops->list_voltage(rdev, selector);
2479                 if (lock)
2480                         mutex_unlock(&rdev->mutex);
2481         } else if (rdev->is_switch && rdev->supply) {
2482                 ret = _regulator_list_voltage(rdev->supply, selector, lock);
2483         } else {
2484                 return -EINVAL;
2485         }
2486
2487         if (ret > 0) {
2488                 if (ret < rdev->constraints->min_uV)
2489                         ret = 0;
2490                 else if (ret > rdev->constraints->max_uV)
2491                         ret = 0;
2492         }
2493
2494         return ret;
2495 }
2496
2497 /**
2498  * regulator_is_enabled - is the regulator output enabled
2499  * @regulator: regulator source
2500  *
2501  * Returns positive if the regulator driver backing the source/client
2502  * has requested that the device be enabled, zero if it hasn't, else a
2503  * negative errno code.
2504  *
2505  * Note that the device backing this regulator handle can have multiple
2506  * users, so it might be enabled even if regulator_enable() was never
2507  * called for this particular source.
2508  */
2509 int regulator_is_enabled(struct regulator *regulator)
2510 {
2511         int ret;
2512
2513         if (regulator->always_on)
2514                 return 1;
2515
2516         mutex_lock(&regulator->rdev->mutex);
2517         ret = _regulator_is_enabled(regulator->rdev);
2518         mutex_unlock(&regulator->rdev->mutex);
2519
2520         return ret;
2521 }
2522 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2523
2524 /**
2525  * regulator_count_voltages - count regulator_list_voltage() selectors
2526  * @regulator: regulator source
2527  *
2528  * Returns number of selectors, or negative errno.  Selectors are
2529  * numbered starting at zero, and typically correspond to bitfields
2530  * in hardware registers.
2531  */
2532 int regulator_count_voltages(struct regulator *regulator)
2533 {
2534         struct regulator_dev    *rdev = regulator->rdev;
2535
2536         if (rdev->desc->n_voltages)
2537                 return rdev->desc->n_voltages;
2538
2539         if (!rdev->is_switch || !rdev->supply)
2540                 return -EINVAL;
2541
2542         return regulator_count_voltages(rdev->supply);
2543 }
2544 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2545
2546 /**
2547  * regulator_list_voltage - enumerate supported voltages
2548  * @regulator: regulator source
2549  * @selector: identify voltage to list
2550  * Context: can sleep
2551  *
2552  * Returns a voltage that can be passed to @regulator_set_voltage(),
2553  * zero if this selector code can't be used on this system, or a
2554  * negative errno.
2555  */
2556 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2557 {
2558         return _regulator_list_voltage(regulator, selector, 1);
2559 }
2560 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2561
2562 /**
2563  * regulator_get_regmap - get the regulator's register map
2564  * @regulator: regulator source
2565  *
2566  * Returns the register map for the given regulator, or an ERR_PTR value
2567  * if the regulator doesn't use regmap.
2568  */
2569 struct regmap *regulator_get_regmap(struct regulator *regulator)
2570 {
2571         struct regmap *map = regulator->rdev->regmap;
2572
2573         return map ? map : ERR_PTR(-EOPNOTSUPP);
2574 }
2575
2576 /**
2577  * regulator_get_hardware_vsel_register - get the HW voltage selector register
2578  * @regulator: regulator source
2579  * @vsel_reg: voltage selector register, output parameter
2580  * @vsel_mask: mask for voltage selector bitfield, output parameter
2581  *
2582  * Returns the hardware register offset and bitmask used for setting the
2583  * regulator voltage. This might be useful when configuring voltage-scaling
2584  * hardware or firmware that can make I2C requests behind the kernel's back,
2585  * for example.
2586  *
2587  * On success, the output parameters @vsel_reg and @vsel_mask are filled in
2588  * and 0 is returned, otherwise a negative errno is returned.
2589  */
2590 int regulator_get_hardware_vsel_register(struct regulator *regulator,
2591                                          unsigned *vsel_reg,
2592                                          unsigned *vsel_mask)
2593 {
2594         struct regulator_dev *rdev = regulator->rdev;
2595         const struct regulator_ops *ops = rdev->desc->ops;
2596
2597         if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2598                 return -EOPNOTSUPP;
2599
2600          *vsel_reg = rdev->desc->vsel_reg;
2601          *vsel_mask = rdev->desc->vsel_mask;
2602
2603          return 0;
2604 }
2605 EXPORT_SYMBOL_GPL(regulator_get_hardware_vsel_register);
2606
2607 /**
2608  * regulator_list_hardware_vsel - get the HW-specific register value for a selector
2609  * @regulator: regulator source
2610  * @selector: identify voltage to list
2611  *
2612  * Converts the selector to a hardware-specific voltage selector that can be
2613  * directly written to the regulator registers. The address of the voltage
2614  * register can be determined by calling @regulator_get_hardware_vsel_register.
2615  *
2616  * On error a negative errno is returned.
2617  */
2618 int regulator_list_hardware_vsel(struct regulator *regulator,
2619                                  unsigned selector)
2620 {
2621         struct regulator_dev *rdev = regulator->rdev;
2622         const struct regulator_ops *ops = rdev->desc->ops;
2623
2624         if (selector >= rdev->desc->n_voltages)
2625                 return -EINVAL;
2626         if (ops->set_voltage_sel != regulator_set_voltage_sel_regmap)
2627                 return -EOPNOTSUPP;
2628
2629         return selector;
2630 }
2631 EXPORT_SYMBOL_GPL(regulator_list_hardware_vsel);
2632
2633 /**
2634  * regulator_get_linear_step - return the voltage step size between VSEL values
2635  * @regulator: regulator source
2636  *
2637  * Returns the voltage step size between VSEL values for linear
2638  * regulators, or return 0 if the regulator isn't a linear regulator.
2639  */
2640 unsigned int regulator_get_linear_step(struct regulator *regulator)
2641 {
2642         struct regulator_dev *rdev = regulator->rdev;
2643
2644         return rdev->desc->uV_step;
2645 }
2646 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2647
2648 /**
2649  * regulator_is_supported_voltage - check if a voltage range can be supported
2650  *
2651  * @regulator: Regulator to check.
2652  * @min_uV: Minimum required voltage in uV.
2653  * @max_uV: Maximum required voltage in uV.
2654  *
2655  * Returns a boolean or a negative error code.
2656  */
2657 int regulator_is_supported_voltage(struct regulator *regulator,
2658                                    int min_uV, int max_uV)
2659 {
2660         struct regulator_dev *rdev = regulator->rdev;
2661         int i, voltages, ret;
2662
2663         /* If we can't change voltage check the current voltage */
2664         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2665                 ret = regulator_get_voltage(regulator);
2666                 if (ret >= 0)
2667                         return min_uV <= ret && ret <= max_uV;
2668                 else
2669                         return ret;
2670         }
2671
2672         /* Any voltage within constrains range is fine? */
2673         if (rdev->desc->continuous_voltage_range)
2674                 return min_uV >= rdev->constraints->min_uV &&
2675                                 max_uV <= rdev->constraints->max_uV;
2676
2677         ret = regulator_count_voltages(regulator);
2678         if (ret < 0)
2679                 return ret;
2680         voltages = ret;
2681
2682         for (i = 0; i < voltages; i++) {
2683                 ret = regulator_list_voltage(regulator, i);
2684
2685                 if (ret >= min_uV && ret <= max_uV)
2686                         return 1;
2687         }
2688
2689         return 0;
2690 }
2691 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2692
2693 static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
2694                                  int max_uV)
2695 {
2696         const struct regulator_desc *desc = rdev->desc;
2697
2698         if (desc->ops->map_voltage)
2699                 return desc->ops->map_voltage(rdev, min_uV, max_uV);
2700
2701         if (desc->ops->list_voltage == regulator_list_voltage_linear)
2702                 return regulator_map_voltage_linear(rdev, min_uV, max_uV);
2703
2704         if (desc->ops->list_voltage == regulator_list_voltage_linear_range)
2705                 return regulator_map_voltage_linear_range(rdev, min_uV, max_uV);
2706
2707         return regulator_map_voltage_iterate(rdev, min_uV, max_uV);
2708 }
2709
2710 static int _regulator_call_set_voltage(struct regulator_dev *rdev,
2711                                        int min_uV, int max_uV,
2712                                        unsigned *selector)
2713 {
2714         struct pre_voltage_change_data data;
2715         int ret;
2716
2717         data.old_uV = _regulator_get_voltage(rdev);
2718         data.min_uV = min_uV;
2719         data.max_uV = max_uV;
2720         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2721                                    &data);
2722         if (ret & NOTIFY_STOP_MASK)
2723                 return -EINVAL;
2724
2725         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV, selector);
2726         if (ret >= 0)
2727                 return ret;
2728
2729         _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2730                              (void *)data.old_uV);
2731
2732         return ret;
2733 }
2734
2735 static int _regulator_call_set_voltage_sel(struct regulator_dev *rdev,
2736                                            int uV, unsigned selector)
2737 {
2738         struct pre_voltage_change_data data;
2739         int ret;
2740
2741         data.old_uV = _regulator_get_voltage(rdev);
2742         data.min_uV = uV;
2743         data.max_uV = uV;
2744         ret = _notifier_call_chain(rdev, REGULATOR_EVENT_PRE_VOLTAGE_CHANGE,
2745                                    &data);
2746         if (ret & NOTIFY_STOP_MASK)
2747                 return -EINVAL;
2748
2749         ret = rdev->desc->ops->set_voltage_sel(rdev, selector);
2750         if (ret >= 0)
2751                 return ret;
2752
2753         _notifier_call_chain(rdev, REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE,
2754                              (void *)data.old_uV);
2755
2756         return ret;
2757 }
2758
2759 static int _regulator_set_voltage_time(struct regulator_dev *rdev,
2760                                        int old_uV, int new_uV)
2761 {
2762         unsigned int ramp_delay = 0;
2763
2764         if (rdev->constraints->ramp_delay)
2765                 ramp_delay = rdev->constraints->ramp_delay;
2766         else if (rdev->desc->ramp_delay)
2767                 ramp_delay = rdev->desc->ramp_delay;
2768         else if (rdev->constraints->settling_time)
2769                 return rdev->constraints->settling_time;
2770
2771         if (ramp_delay == 0) {
2772                 rdev_dbg(rdev, "ramp_delay not set\n");
2773                 return 0;
2774         }
2775
2776         return DIV_ROUND_UP(abs(new_uV - old_uV), ramp_delay);
2777 }
2778
2779 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2780                                      int min_uV, int max_uV)
2781 {
2782         int ret;
2783         int delay = 0;
2784         int best_val = 0;
2785         unsigned int selector;
2786         int old_selector = -1;
2787         const struct regulator_ops *ops = rdev->desc->ops;
2788         int old_uV = _regulator_get_voltage(rdev);
2789
2790         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2791
2792         min_uV += rdev->constraints->uV_offset;
2793         max_uV += rdev->constraints->uV_offset;
2794
2795         /*
2796          * If we can't obtain the old selector there is not enough
2797          * info to call set_voltage_time_sel().
2798          */
2799         if (_regulator_is_enabled(rdev) &&
2800             ops->set_voltage_time_sel && ops->get_voltage_sel) {
2801                 old_selector = ops->get_voltage_sel(rdev);
2802                 if (old_selector < 0)
2803                         return old_selector;
2804         }
2805
2806         if (ops->set_voltage) {
2807                 ret = _regulator_call_set_voltage(rdev, min_uV, max_uV,
2808                                                   &selector);
2809
2810                 if (ret >= 0) {
2811                         if (ops->list_voltage)
2812                                 best_val = ops->list_voltage(rdev,
2813                                                              selector);
2814                         else
2815                                 best_val = _regulator_get_voltage(rdev);
2816                 }
2817
2818         } else if (ops->set_voltage_sel) {
2819                 ret = regulator_map_voltage(rdev, min_uV, max_uV);
2820                 if (ret >= 0) {
2821                         best_val = ops->list_voltage(rdev, ret);
2822                         if (min_uV <= best_val && max_uV >= best_val) {
2823                                 selector = ret;
2824                                 if (old_selector == selector)
2825                                         ret = 0;
2826                                 else
2827                                         ret = _regulator_call_set_voltage_sel(
2828                                                 rdev, best_val, selector);
2829                         } else {
2830                                 ret = -EINVAL;
2831                         }
2832                 }
2833         } else {
2834                 ret = -EINVAL;
2835         }
2836
2837         if (ret)
2838                 goto out;
2839
2840         if (ops->set_voltage_time_sel) {
2841                 /*
2842                  * Call set_voltage_time_sel if successfully obtained
2843                  * old_selector
2844                  */
2845                 if (old_selector >= 0 && old_selector != selector)
2846                         delay = ops->set_voltage_time_sel(rdev, old_selector,
2847                                                           selector);
2848         } else {
2849                 if (old_uV != best_val) {
2850                         if (ops->set_voltage_time)
2851                                 delay = ops->set_voltage_time(rdev, old_uV,
2852                                                               best_val);
2853                         else
2854                                 delay = _regulator_set_voltage_time(rdev,
2855                                                                     old_uV,
2856                                                                     best_val);
2857                 }
2858         }
2859
2860         if (delay < 0) {
2861                 rdev_warn(rdev, "failed to get delay: %d\n", delay);
2862                 delay = 0;
2863         }
2864
2865         /* Insert any necessary delays */
2866         if (delay >= 1000) {
2867                 mdelay(delay / 1000);
2868                 udelay(delay % 1000);
2869         } else if (delay) {
2870                 udelay(delay);
2871         }
2872
2873         if (best_val >= 0) {
2874                 unsigned long data = best_val;
2875
2876                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2877                                      (void *)data);
2878         }
2879
2880 out:
2881         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2882
2883         return ret;
2884 }
2885
2886 static int regulator_set_voltage_unlocked(struct regulator *regulator,
2887                                           int min_uV, int max_uV)
2888 {
2889         struct regulator_dev *rdev = regulator->rdev;
2890         int ret = 0;
2891         int old_min_uV, old_max_uV;
2892         int current_uV;
2893         int best_supply_uV = 0;
2894         int supply_change_uV = 0;
2895
2896         /* If we're setting the same range as last time the change
2897          * should be a noop (some cpufreq implementations use the same
2898          * voltage for multiple frequencies, for example).
2899          */
2900         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2901                 goto out;
2902
2903         /* If we're trying to set a range that overlaps the current voltage,
2904          * return successfully even though the regulator does not support
2905          * changing the voltage.
2906          */
2907         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_VOLTAGE)) {
2908                 current_uV = _regulator_get_voltage(rdev);
2909                 if (min_uV <= current_uV && current_uV <= max_uV) {
2910                         regulator->min_uV = min_uV;
2911                         regulator->max_uV = max_uV;
2912                         goto out;
2913                 }
2914         }
2915
2916         /* sanity check */
2917         if (!rdev->desc->ops->set_voltage &&
2918             !rdev->desc->ops->set_voltage_sel) {
2919                 ret = -EINVAL;
2920                 goto out;
2921         }
2922
2923         /* constraints check */
2924         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2925         if (ret < 0)
2926                 goto out;
2927
2928         /* restore original values in case of error */
2929         old_min_uV = regulator->min_uV;
2930         old_max_uV = regulator->max_uV;
2931         regulator->min_uV = min_uV;
2932         regulator->max_uV = max_uV;
2933
2934         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2935         if (ret < 0)
2936                 goto out2;
2937
2938         if (rdev->supply &&
2939             regulator_ops_is_valid(rdev->supply->rdev,
2940                                    REGULATOR_CHANGE_VOLTAGE) &&
2941             (rdev->desc->min_dropout_uV || !rdev->desc->ops->get_voltage)) {
2942                 int current_supply_uV;
2943                 int selector;
2944
2945                 selector = regulator_map_voltage(rdev, min_uV, max_uV);
2946                 if (selector < 0) {
2947                         ret = selector;
2948                         goto out2;
2949                 }
2950
2951                 best_supply_uV = _regulator_list_voltage(regulator, selector, 0);
2952                 if (best_supply_uV < 0) {
2953                         ret = best_supply_uV;
2954                         goto out2;
2955                 }
2956
2957                 best_supply_uV += rdev->desc->min_dropout_uV;
2958
2959                 current_supply_uV = _regulator_get_voltage(rdev->supply->rdev);
2960                 if (current_supply_uV < 0) {
2961                         ret = current_supply_uV;
2962                         goto out2;
2963                 }
2964
2965                 supply_change_uV = best_supply_uV - current_supply_uV;
2966         }
2967
2968         if (supply_change_uV > 0) {
2969                 ret = regulator_set_voltage_unlocked(rdev->supply,
2970                                 best_supply_uV, INT_MAX);
2971                 if (ret) {
2972                         dev_err(&rdev->dev, "Failed to increase supply voltage: %d\n",
2973                                         ret);
2974                         goto out2;
2975                 }
2976         }
2977
2978         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2979         if (ret < 0)
2980                 goto out2;
2981
2982         if (supply_change_uV < 0) {
2983                 ret = regulator_set_voltage_unlocked(rdev->supply,
2984                                 best_supply_uV, INT_MAX);
2985                 if (ret)
2986                         dev_warn(&rdev->dev, "Failed to decrease supply voltage: %d\n",
2987                                         ret);
2988                 /* No need to fail here */
2989                 ret = 0;
2990         }
2991
2992 out:
2993         return ret;
2994 out2:
2995         regulator->min_uV = old_min_uV;
2996         regulator->max_uV = old_max_uV;
2997
2998         return ret;
2999 }
3000
3001 /**
3002  * regulator_set_voltage - set regulator output voltage
3003  * @regulator: regulator source
3004  * @min_uV: Minimum required voltage in uV
3005  * @max_uV: Maximum acceptable voltage in uV
3006  *
3007  * Sets a voltage regulator to the desired output voltage. This can be set
3008  * during any regulator state. IOW, regulator can be disabled or enabled.
3009  *
3010  * If the regulator is enabled then the voltage will change to the new value
3011  * immediately otherwise if the regulator is disabled the regulator will
3012  * output at the new voltage when enabled.
3013  *
3014  * NOTE: If the regulator is shared between several devices then the lowest
3015  * request voltage that meets the system constraints will be used.
3016  * Regulator system constraints must be set for this regulator before
3017  * calling this function otherwise this call will fail.
3018  */
3019 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
3020 {
3021         int ret = 0;
3022
3023         regulator_lock_supply(regulator->rdev);
3024
3025         ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
3026
3027         regulator_unlock_supply(regulator->rdev);
3028
3029         return ret;
3030 }
3031 EXPORT_SYMBOL_GPL(regulator_set_voltage);
3032
3033 /**
3034  * regulator_set_voltage_time - get raise/fall time
3035  * @regulator: regulator source
3036  * @old_uV: starting voltage in microvolts
3037  * @new_uV: target voltage in microvolts
3038  *
3039  * Provided with the starting and ending voltage, this function attempts to
3040  * calculate the time in microseconds required to rise or fall to this new
3041  * voltage.
3042  */
3043 int regulator_set_voltage_time(struct regulator *regulator,
3044                                int old_uV, int new_uV)
3045 {
3046         struct regulator_dev *rdev = regulator->rdev;
3047         const struct regulator_ops *ops = rdev->desc->ops;
3048         int old_sel = -1;
3049         int new_sel = -1;
3050         int voltage;
3051         int i;
3052
3053         if (ops->set_voltage_time)
3054                 return ops->set_voltage_time(rdev, old_uV, new_uV);
3055         else if (!ops->set_voltage_time_sel)
3056                 return _regulator_set_voltage_time(rdev, old_uV, new_uV);
3057
3058         /* Currently requires operations to do this */
3059         if (!ops->list_voltage || !rdev->desc->n_voltages)
3060                 return -EINVAL;
3061
3062         for (i = 0; i < rdev->desc->n_voltages; i++) {
3063                 /* We only look for exact voltage matches here */
3064                 voltage = regulator_list_voltage(regulator, i);
3065                 if (voltage < 0)
3066                         return -EINVAL;
3067                 if (voltage == 0)
3068                         continue;
3069                 if (voltage == old_uV)
3070                         old_sel = i;
3071                 if (voltage == new_uV)
3072                         new_sel = i;
3073         }
3074
3075         if (old_sel < 0 || new_sel < 0)
3076                 return -EINVAL;
3077
3078         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
3079 }
3080 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
3081
3082 /**
3083  * regulator_set_voltage_time_sel - get raise/fall time
3084  * @rdev: regulator source device
3085  * @old_selector: selector for starting voltage
3086  * @new_selector: selector for target voltage
3087  *
3088  * Provided with the starting and target voltage selectors, this function
3089  * returns time in microseconds required to rise or fall to this new voltage
3090  *
3091  * Drivers providing ramp_delay in regulation_constraints can use this as their
3092  * set_voltage_time_sel() operation.
3093  */
3094 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
3095                                    unsigned int old_selector,
3096                                    unsigned int new_selector)
3097 {
3098         int old_volt, new_volt;
3099
3100         /* sanity check */
3101         if (!rdev->desc->ops->list_voltage)
3102                 return -EINVAL;
3103
3104         old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
3105         new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
3106
3107         if (rdev->desc->ops->set_voltage_time)
3108                 return rdev->desc->ops->set_voltage_time(rdev, old_volt,
3109                                                          new_volt);
3110         else
3111                 return _regulator_set_voltage_time(rdev, old_volt, new_volt);
3112 }
3113 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
3114
3115 /**
3116  * regulator_sync_voltage - re-apply last regulator output voltage
3117  * @regulator: regulator source
3118  *
3119  * Re-apply the last configured voltage.  This is intended to be used
3120  * where some external control source the consumer is cooperating with
3121  * has caused the configured voltage to change.
3122  */
3123 int regulator_sync_voltage(struct regulator *regulator)
3124 {
3125         struct regulator_dev *rdev = regulator->rdev;
3126         int ret, min_uV, max_uV;
3127
3128         mutex_lock(&rdev->mutex);
3129
3130         if (!rdev->desc->ops->set_voltage &&
3131             !rdev->desc->ops->set_voltage_sel) {
3132                 ret = -EINVAL;
3133                 goto out;
3134         }
3135
3136         /* This is only going to work if we've had a voltage configured. */
3137         if (!regulator->min_uV && !regulator->max_uV) {
3138                 ret = -EINVAL;
3139                 goto out;
3140         }
3141
3142         min_uV = regulator->min_uV;
3143         max_uV = regulator->max_uV;
3144
3145         /* This should be a paranoia check... */
3146         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
3147         if (ret < 0)
3148                 goto out;
3149
3150         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
3151         if (ret < 0)
3152                 goto out;
3153
3154         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
3155
3156 out:
3157         mutex_unlock(&rdev->mutex);
3158         return ret;
3159 }
3160 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
3161
3162 static int _regulator_get_voltage(struct regulator_dev *rdev)
3163 {
3164         int sel, ret;
3165         bool bypassed;
3166
3167         if (rdev->desc->ops->get_bypass) {
3168                 ret = rdev->desc->ops->get_bypass(rdev, &bypassed);
3169                 if (ret < 0)
3170                         return ret;
3171                 if (bypassed) {
3172                         /* if bypassed the regulator must have a supply */
3173                         if (!rdev->supply) {
3174                                 rdev_err(rdev,
3175                                          "bypassed regulator has no supply!\n");
3176                                 return -EPROBE_DEFER;
3177                         }
3178
3179                         return _regulator_get_voltage(rdev->supply->rdev);
3180                 }
3181         }
3182
3183         if (rdev->desc->ops->get_voltage_sel) {
3184                 sel = rdev->desc->ops->get_voltage_sel(rdev);
3185                 if (sel < 0)
3186                         return sel;
3187                 ret = rdev->desc->ops->list_voltage(rdev, sel);
3188         } else if (rdev->desc->ops->get_voltage) {
3189                 ret = rdev->desc->ops->get_voltage(rdev);
3190         } else if (rdev->desc->ops->list_voltage) {
3191                 ret = rdev->desc->ops->list_voltage(rdev, 0);
3192         } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
3193                 ret = rdev->desc->fixed_uV;
3194         } else if (rdev->supply) {
3195                 ret = _regulator_get_voltage(rdev->supply->rdev);
3196         } else {
3197                 return -EINVAL;
3198         }
3199
3200         if (ret < 0)
3201                 return ret;
3202         return ret - rdev->constraints->uV_offset;
3203 }
3204
3205 /**
3206  * regulator_get_voltage - get regulator output voltage
3207  * @regulator: regulator source
3208  *
3209  * This returns the current regulator voltage in uV.
3210  *
3211  * NOTE: If the regulator is disabled it will return the voltage value. This
3212  * function should not be used to determine regulator state.
3213  */
3214 int regulator_get_voltage(struct regulator *regulator)
3215 {
3216         int ret;
3217
3218         regulator_lock_supply(regulator->rdev);
3219
3220         ret = _regulator_get_voltage(regulator->rdev);
3221
3222         regulator_unlock_supply(regulator->rdev);
3223
3224         return ret;
3225 }
3226 EXPORT_SYMBOL_GPL(regulator_get_voltage);
3227
3228 /**
3229  * regulator_set_current_limit - set regulator output current limit
3230  * @regulator: regulator source
3231  * @min_uA: Minimum supported current in uA
3232  * @max_uA: Maximum supported current in uA
3233  *
3234  * Sets current sink to the desired output current. This can be set during
3235  * any regulator state. IOW, regulator can be disabled or enabled.
3236  *
3237  * If the regulator is enabled then the current will change to the new value
3238  * immediately otherwise if the regulator is disabled the regulator will
3239  * output at the new current when enabled.
3240  *
3241  * NOTE: Regulator system constraints must be set for this regulator before
3242  * calling this function otherwise this call will fail.
3243  */
3244 int regulator_set_current_limit(struct regulator *regulator,
3245                                int min_uA, int max_uA)
3246 {
3247         struct regulator_dev *rdev = regulator->rdev;
3248         int ret;
3249
3250         mutex_lock(&rdev->mutex);
3251
3252         /* sanity check */
3253         if (!rdev->desc->ops->set_current_limit) {
3254                 ret = -EINVAL;
3255                 goto out;
3256         }
3257
3258         /* constraints check */
3259         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
3260         if (ret < 0)
3261                 goto out;
3262
3263         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
3264 out:
3265         mutex_unlock(&rdev->mutex);
3266         return ret;
3267 }
3268 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
3269
3270 static int _regulator_get_current_limit(struct regulator_dev *rdev)
3271 {
3272         int ret;
3273
3274         mutex_lock(&rdev->mutex);
3275
3276         /* sanity check */
3277         if (!rdev->desc->ops->get_current_limit) {
3278                 ret = -EINVAL;
3279                 goto out;
3280         }
3281
3282         ret = rdev->desc->ops->get_current_limit(rdev);
3283 out:
3284         mutex_unlock(&rdev->mutex);
3285         return ret;
3286 }
3287
3288 /**
3289  * regulator_get_current_limit - get regulator output current
3290  * @regulator: regulator source
3291  *
3292  * This returns the current supplied by the specified current sink in uA.
3293  *
3294  * NOTE: If the regulator is disabled it will return the current value. This
3295  * function should not be used to determine regulator state.
3296  */
3297 int regulator_get_current_limit(struct regulator *regulator)
3298 {
3299         return _regulator_get_current_limit(regulator->rdev);
3300 }
3301 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
3302
3303 /**
3304  * regulator_set_mode - set regulator operating mode
3305  * @regulator: regulator source
3306  * @mode: operating mode - one of the REGULATOR_MODE constants
3307  *
3308  * Set regulator operating mode to increase regulator efficiency or improve
3309  * regulation performance.
3310  *
3311  * NOTE: Regulator system constraints must be set for this regulator before
3312  * calling this function otherwise this call will fail.
3313  */
3314 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
3315 {
3316         struct regulator_dev *rdev = regulator->rdev;
3317         int ret;
3318         int regulator_curr_mode;
3319
3320         mutex_lock(&rdev->mutex);
3321
3322         /* sanity check */
3323         if (!rdev->desc->ops->set_mode) {
3324                 ret = -EINVAL;
3325                 goto out;
3326         }
3327
3328         /* return if the same mode is requested */
3329         if (rdev->desc->ops->get_mode) {
3330                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
3331                 if (regulator_curr_mode == mode) {
3332                         ret = 0;
3333                         goto out;
3334                 }
3335         }
3336
3337         /* constraints check */
3338         ret = regulator_mode_constrain(rdev, &mode);
3339         if (ret < 0)
3340                 goto out;
3341
3342         ret = rdev->desc->ops->set_mode(rdev, mode);
3343 out:
3344         mutex_unlock(&rdev->mutex);
3345         return ret;
3346 }
3347 EXPORT_SYMBOL_GPL(regulator_set_mode);
3348
3349 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
3350 {
3351         int ret;
3352
3353         mutex_lock(&rdev->mutex);
3354
3355         /* sanity check */
3356         if (!rdev->desc->ops->get_mode) {
3357                 ret = -EINVAL;
3358                 goto out;
3359         }
3360
3361         ret = rdev->desc->ops->get_mode(rdev);
3362 out:
3363         mutex_unlock(&rdev->mutex);
3364         return ret;
3365 }
3366
3367 /**
3368  * regulator_get_mode - get regulator operating mode
3369  * @regulator: regulator source
3370  *
3371  * Get the current regulator operating mode.
3372  */
3373 unsigned int regulator_get_mode(struct regulator *regulator)
3374 {
3375         return _regulator_get_mode(regulator->rdev);
3376 }
3377 EXPORT_SYMBOL_GPL(regulator_get_mode);
3378
3379 static int _regulator_get_error_flags(struct regulator_dev *rdev,
3380                                         unsigned int *flags)
3381 {
3382         int ret;
3383
3384         mutex_lock(&rdev->mutex);
3385
3386         /* sanity check */
3387         if (!rdev->desc->ops->get_error_flags) {
3388                 ret = -EINVAL;
3389                 goto out;
3390         }
3391
3392         ret = rdev->desc->ops->get_error_flags(rdev, flags);
3393 out:
3394         mutex_unlock(&rdev->mutex);
3395         return ret;
3396 }
3397
3398 /**
3399  * regulator_get_error_flags - get regulator error information
3400  * @regulator: regulator source
3401  * @flags: pointer to store error flags
3402  *
3403  * Get the current regulator error information.
3404  */
3405 int regulator_get_error_flags(struct regulator *regulator,
3406                                 unsigned int *flags)
3407 {
3408         return _regulator_get_error_flags(regulator->rdev, flags);
3409 }
3410 EXPORT_SYMBOL_GPL(regulator_get_error_flags);
3411
3412 /**
3413  * regulator_set_load - set regulator load
3414  * @regulator: regulator source
3415  * @uA_load: load current
3416  *
3417  * Notifies the regulator core of a new device load. This is then used by
3418  * DRMS (if enabled by constraints) to set the most efficient regulator
3419  * operating mode for the new regulator loading.
3420  *
3421  * Consumer devices notify their supply regulator of the maximum power
3422  * they will require (can be taken from device datasheet in the power
3423  * consumption tables) when they change operational status and hence power
3424  * state. Examples of operational state changes that can affect power
3425  * consumption are :-
3426  *
3427  *    o Device is opened / closed.
3428  *    o Device I/O is about to begin or has just finished.
3429  *    o Device is idling in between work.
3430  *
3431  * This information is also exported via sysfs to userspace.
3432  *
3433  * DRMS will sum the total requested load on the regulator and change
3434  * to the most efficient operating mode if platform constraints allow.
3435  *
3436  * On error a negative errno is returned.
3437  */
3438 int regulator_set_load(struct regulator *regulator, int uA_load)
3439 {
3440         struct regulator_dev *rdev = regulator->rdev;
3441         int ret;
3442
3443         mutex_lock(&rdev->mutex);
3444         regulator->uA_load = uA_load;
3445         ret = drms_uA_update(rdev);
3446         mutex_unlock(&rdev->mutex);
3447
3448         return ret;
3449 }
3450 EXPORT_SYMBOL_GPL(regulator_set_load);
3451
3452 /**
3453  * regulator_allow_bypass - allow the regulator to go into bypass mode
3454  *
3455  * @regulator: Regulator to configure
3456  * @enable: enable or disable bypass mode
3457  *
3458  * Allow the regulator to go into bypass mode if all other consumers
3459  * for the regulator also enable bypass mode and the machine
3460  * constraints allow this.  Bypass mode means that the regulator is
3461  * simply passing the input directly to the output with no regulation.
3462  */
3463 int regulator_allow_bypass(struct regulator *regulator, bool enable)
3464 {
3465         struct regulator_dev *rdev = regulator->rdev;
3466         int ret = 0;
3467
3468         if (!rdev->desc->ops->set_bypass)
3469                 return 0;
3470
3471         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_BYPASS))
3472                 return 0;
3473
3474         mutex_lock(&rdev->mutex);
3475
3476         if (enable && !regulator->bypass) {
3477                 rdev->bypass_count++;
3478
3479                 if (rdev->bypass_count == rdev->open_count) {
3480                         ret = rdev->desc->ops->set_bypass(rdev, enable);
3481                         if (ret != 0)
3482                                 rdev->bypass_count--;
3483                 }
3484
3485         } else if (!enable && regulator->bypass) {
3486                 rdev->bypass_count--;
3487
3488                 if (rdev->bypass_count != rdev->open_count) {
3489                         ret = rdev->desc->ops->set_bypass(rdev, enable);
3490                         if (ret != 0)
3491                                 rdev->bypass_count++;
3492                 }
3493         }
3494
3495         if (ret == 0)
3496                 regulator->bypass = enable;
3497
3498         mutex_unlock(&rdev->mutex);
3499
3500         return ret;
3501 }
3502 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
3503
3504 /**
3505  * regulator_register_notifier - register regulator event notifier
3506  * @regulator: regulator source
3507  * @nb: notifier block
3508  *
3509  * Register notifier block to receive regulator events.
3510  */
3511 int regulator_register_notifier(struct regulator *regulator,
3512                               struct notifier_block *nb)
3513 {
3514         return blocking_notifier_chain_register(&regulator->rdev->notifier,
3515                                                 nb);
3516 }
3517 EXPORT_SYMBOL_GPL(regulator_register_notifier);
3518
3519 /**
3520  * regulator_unregister_notifier - unregister regulator event notifier
3521  * @regulator: regulator source
3522  * @nb: notifier block
3523  *
3524  * Unregister regulator event notifier block.
3525  */
3526 int regulator_unregister_notifier(struct regulator *regulator,
3527                                 struct notifier_block *nb)
3528 {
3529         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
3530                                                   nb);
3531 }
3532 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
3533
3534 /* notify regulator consumers and downstream regulator consumers.
3535  * Note mutex must be held by caller.
3536  */
3537 static int _notifier_call_chain(struct regulator_dev *rdev,
3538                                   unsigned long event, void *data)
3539 {
3540         /* call rdev chain first */
3541         return blocking_notifier_call_chain(&rdev->notifier, event, data);
3542 }
3543
3544 /**
3545  * regulator_bulk_get - get multiple regulator consumers
3546  *
3547  * @dev:           Device to supply
3548  * @num_consumers: Number of consumers to register
3549  * @consumers:     Configuration of consumers; clients are stored here.
3550  *
3551  * @return 0 on success, an errno on failure.
3552  *
3553  * This helper function allows drivers to get several regulator
3554  * consumers in one operation.  If any of the regulators cannot be
3555  * acquired then any regulators that were allocated will be freed
3556  * before returning to the caller.
3557  */
3558 int regulator_bulk_get(struct device *dev, int num_consumers,
3559                        struct regulator_bulk_data *consumers)
3560 {
3561         int i;
3562         int ret;
3563
3564         for (i = 0; i < num_consumers; i++)
3565                 consumers[i].consumer = NULL;
3566
3567         for (i = 0; i < num_consumers; i++) {
3568                 consumers[i].consumer = regulator_get(dev,
3569                                                       consumers[i].supply);
3570                 if (IS_ERR(consumers[i].consumer)) {
3571                         ret = PTR_ERR(consumers[i].consumer);
3572                         dev_err(dev, "Failed to get supply '%s': %d\n",
3573                                 consumers[i].supply, ret);
3574                         consumers[i].consumer = NULL;
3575                         goto err;
3576                 }
3577         }
3578
3579         return 0;
3580
3581 err:
3582         while (--i >= 0)
3583                 regulator_put(consumers[i].consumer);
3584
3585         return ret;
3586 }
3587 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3588
3589 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3590 {
3591         struct regulator_bulk_data *bulk = data;
3592
3593         bulk->ret = regulator_enable(bulk->consumer);
3594 }
3595
3596 /**
3597  * regulator_bulk_enable - enable multiple regulator consumers
3598  *
3599  * @num_consumers: Number of consumers
3600  * @consumers:     Consumer data; clients are stored here.
3601  * @return         0 on success, an errno on failure
3602  *
3603  * This convenience API allows consumers to enable multiple regulator
3604  * clients in a single API call.  If any consumers cannot be enabled
3605  * then any others that were enabled will be disabled again prior to
3606  * return.
3607  */
3608 int regulator_bulk_enable(int num_consumers,
3609                           struct regulator_bulk_data *consumers)
3610 {
3611         ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3612         int i;
3613         int ret = 0;
3614
3615         for (i = 0; i < num_consumers; i++) {
3616                 if (consumers[i].consumer->always_on)
3617                         consumers[i].ret = 0;
3618                 else
3619                         async_schedule_domain(regulator_bulk_enable_async,
3620                                               &consumers[i], &async_domain);
3621         }
3622
3623         async_synchronize_full_domain(&async_domain);
3624
3625         /* If any consumer failed we need to unwind any that succeeded */
3626         for (i = 0; i < num_consumers; i++) {
3627                 if (consumers[i].ret != 0) {
3628                         ret = consumers[i].ret;
3629                         goto err;
3630                 }
3631         }
3632
3633         return 0;
3634
3635 err:
3636         for (i = 0; i < num_consumers; i++) {
3637                 if (consumers[i].ret < 0)
3638                         pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3639                                consumers[i].ret);
3640                 else
3641                         regulator_disable(consumers[i].consumer);
3642         }
3643
3644         return ret;
3645 }
3646 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3647
3648 /**
3649  * regulator_bulk_disable - disable multiple regulator consumers
3650  *
3651  * @num_consumers: Number of consumers
3652  * @consumers:     Consumer data; clients are stored here.
3653  * @return         0 on success, an errno on failure
3654  *
3655  * This convenience API allows consumers to disable multiple regulator
3656  * clients in a single API call.  If any consumers cannot be disabled
3657  * then any others that were disabled will be enabled again prior to
3658  * return.
3659  */
3660 int regulator_bulk_disable(int num_consumers,
3661                            struct regulator_bulk_data *consumers)
3662 {
3663         int i;
3664         int ret, r;
3665
3666         for (i = num_consumers - 1; i >= 0; --i) {
3667                 ret = regulator_disable(consumers[i].consumer);
3668                 if (ret != 0)
3669                         goto err;
3670         }
3671
3672         return 0;
3673
3674 err:
3675         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3676         for (++i; i < num_consumers; ++i) {
3677                 r = regulator_enable(consumers[i].consumer);
3678                 if (r != 0)
3679                         pr_err("Failed to re-enable %s: %d\n",
3680                                consumers[i].supply, r);
3681         }
3682
3683         return ret;
3684 }
3685 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3686
3687 /**
3688  * regulator_bulk_force_disable - force disable multiple regulator consumers
3689  *
3690  * @num_consumers: Number of consumers
3691  * @consumers:     Consumer data; clients are stored here.
3692  * @return         0 on success, an errno on failure
3693  *
3694  * This convenience API allows consumers to forcibly disable multiple regulator
3695  * clients in a single API call.
3696  * NOTE: This should be used for situations when device damage will
3697  * likely occur if the regulators are not disabled (e.g. over temp).
3698  * Although regulator_force_disable function call for some consumers can
3699  * return error numbers, the function is called for all consumers.
3700  */
3701 int regulator_bulk_force_disable(int num_consumers,
3702                            struct regulator_bulk_data *consumers)
3703 {
3704         int i;
3705         int ret = 0;
3706
3707         for (i = 0; i < num_consumers; i++) {
3708                 consumers[i].ret =
3709                             regulator_force_disable(consumers[i].consumer);
3710
3711                 /* Store first error for reporting */
3712                 if (consumers[i].ret && !ret)
3713                         ret = consumers[i].ret;
3714         }
3715
3716         return ret;
3717 }
3718 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3719
3720 /**
3721  * regulator_bulk_free - free multiple regulator consumers
3722  *
3723  * @num_consumers: Number of consumers
3724  * @consumers:     Consumer data; clients are stored here.
3725  *
3726  * This convenience API allows consumers to free multiple regulator
3727  * clients in a single API call.
3728  */
3729 void regulator_bulk_free(int num_consumers,
3730                          struct regulator_bulk_data *consumers)
3731 {
3732         int i;
3733
3734         for (i = 0; i < num_consumers; i++) {
3735                 regulator_put(consumers[i].consumer);
3736                 consumers[i].consumer = NULL;
3737         }
3738 }
3739 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3740
3741 /**
3742  * regulator_notifier_call_chain - call regulator event notifier
3743  * @rdev: regulator source
3744  * @event: notifier block
3745  * @data: callback-specific data.
3746  *
3747  * Called by regulator drivers to notify clients a regulator event has
3748  * occurred. We also notify regulator clients downstream.
3749  * Note lock must be held by caller.
3750  */
3751 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3752                                   unsigned long event, void *data)
3753 {
3754         lockdep_assert_held_once(&rdev->mutex);
3755
3756         _notifier_call_chain(rdev, event, data);
3757         return NOTIFY_DONE;
3758
3759 }
3760 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3761
3762 /**
3763  * regulator_mode_to_status - convert a regulator mode into a status
3764  *
3765  * @mode: Mode to convert
3766  *
3767  * Convert a regulator mode into a status.
3768  */
3769 int regulator_mode_to_status(unsigned int mode)
3770 {
3771         switch (mode) {
3772         case REGULATOR_MODE_FAST:
3773                 return REGULATOR_STATUS_FAST;
3774         case REGULATOR_MODE_NORMAL:
3775                 return REGULATOR_STATUS_NORMAL;
3776         case REGULATOR_MODE_IDLE:
3777                 return REGULATOR_STATUS_IDLE;
3778         case REGULATOR_MODE_STANDBY:
3779                 return REGULATOR_STATUS_STANDBY;
3780         default:
3781                 return REGULATOR_STATUS_UNDEFINED;
3782         }
3783 }
3784 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3785
3786 static struct attribute *regulator_dev_attrs[] = {
3787         &dev_attr_name.attr,
3788         &dev_attr_num_users.attr,
3789         &dev_attr_type.attr,
3790         &dev_attr_microvolts.attr,
3791         &dev_attr_microamps.attr,
3792         &dev_attr_opmode.attr,
3793         &dev_attr_state.attr,
3794         &dev_attr_status.attr,
3795         &dev_attr_bypass.attr,
3796         &dev_attr_requested_microamps.attr,
3797         &dev_attr_min_microvolts.attr,
3798         &dev_attr_max_microvolts.attr,
3799         &dev_attr_min_microamps.attr,
3800         &dev_attr_max_microamps.attr,
3801         &dev_attr_suspend_standby_state.attr,
3802         &dev_attr_suspend_mem_state.attr,
3803         &dev_attr_suspend_disk_state.attr,
3804         &dev_attr_suspend_standby_microvolts.attr,
3805         &dev_attr_suspend_mem_microvolts.attr,
3806         &dev_attr_suspend_disk_microvolts.attr,
3807         &dev_attr_suspend_standby_mode.attr,
3808         &dev_attr_suspend_mem_mode.attr,
3809         &dev_attr_suspend_disk_mode.attr,
3810         NULL
3811 };
3812
3813 /*
3814  * To avoid cluttering sysfs (and memory) with useless state, only
3815  * create attributes that can be meaningfully displayed.
3816  */
3817 static umode_t regulator_attr_is_visible(struct kobject *kobj,
3818                                          struct attribute *attr, int idx)
3819 {
3820         struct device *dev = kobj_to_dev(kobj);
3821         struct regulator_dev *rdev = dev_to_rdev(dev);
3822         const struct regulator_ops *ops = rdev->desc->ops;
3823         umode_t mode = attr->mode;
3824
3825         /* these three are always present */
3826         if (attr == &dev_attr_name.attr ||
3827             attr == &dev_attr_num_users.attr ||
3828             attr == &dev_attr_type.attr)
3829                 return mode;
3830
3831         /* some attributes need specific methods to be displayed */
3832         if (attr == &dev_attr_microvolts.attr) {
3833                 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3834                     (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3835                     (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3836                     (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1))
3837                         return mode;
3838                 return 0;
3839         }
3840
3841         if (attr == &dev_attr_microamps.attr)
3842                 return ops->get_current_limit ? mode : 0;
3843
3844         if (attr == &dev_attr_opmode.attr)
3845                 return ops->get_mode ? mode : 0;
3846
3847         if (attr == &dev_attr_state.attr)
3848                 return (rdev->ena_pin || ops->is_enabled) ? mode : 0;
3849
3850         if (attr == &dev_attr_status.attr)
3851                 return ops->get_status ? mode : 0;
3852
3853         if (attr == &dev_attr_bypass.attr)
3854                 return ops->get_bypass ? mode : 0;
3855
3856         /* some attributes are type-specific */
3857         if (attr == &dev_attr_requested_microamps.attr)
3858                 return rdev->desc->type == REGULATOR_CURRENT ? mode : 0;
3859
3860         /* constraints need specific supporting methods */
3861         if (attr == &dev_attr_min_microvolts.attr ||
3862             attr == &dev_attr_max_microvolts.attr)
3863                 return (ops->set_voltage || ops->set_voltage_sel) ? mode : 0;
3864
3865         if (attr == &dev_attr_min_microamps.attr ||
3866             attr == &dev_attr_max_microamps.attr)
3867                 return ops->set_current_limit ? mode : 0;
3868
3869         if (attr == &dev_attr_suspend_standby_state.attr ||
3870             attr == &dev_attr_suspend_mem_state.attr ||
3871             attr == &dev_attr_suspend_disk_state.attr)
3872                 return mode;
3873
3874         if (attr == &dev_attr_suspend_standby_microvolts.attr ||
3875             attr == &dev_attr_suspend_mem_microvolts.attr ||
3876             attr == &dev_attr_suspend_disk_microvolts.attr)
3877                 return ops->set_suspend_voltage ? mode : 0;
3878
3879         if (attr == &dev_attr_suspend_standby_mode.attr ||
3880             attr == &dev_attr_suspend_mem_mode.attr ||
3881             attr == &dev_attr_suspend_disk_mode.attr)
3882                 return ops->set_suspend_mode ? mode : 0;
3883
3884         return mode;
3885 }
3886
3887 static const struct attribute_group regulator_dev_group = {
3888         .attrs = regulator_dev_attrs,
3889         .is_visible = regulator_attr_is_visible,
3890 };
3891
3892 static const struct attribute_group *regulator_dev_groups[] = {
3893         &regulator_dev_group,
3894         NULL
3895 };
3896
3897 static void regulator_dev_release(struct device *dev)
3898 {
3899         struct regulator_dev *rdev = dev_get_drvdata(dev);
3900
3901         kfree(rdev->constraints);
3902         of_node_put(rdev->dev.of_node);
3903         kfree(rdev);
3904 }
3905
3906 static struct class regulator_class = {
3907         .name = "regulator",
3908         .dev_release = regulator_dev_release,
3909         .dev_groups = regulator_dev_groups,
3910 };
3911
3912 static void rdev_init_debugfs(struct regulator_dev *rdev)
3913 {
3914         struct device *parent = rdev->dev.parent;
3915         const char *rname = rdev_get_name(rdev);
3916         char name[NAME_MAX];
3917
3918         /* Avoid duplicate debugfs directory names */
3919         if (parent && rname == rdev->desc->name) {
3920                 snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
3921                          rname);
3922                 rname = name;
3923         }
3924
3925         rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
3926         if (!rdev->debugfs) {
3927                 rdev_warn(rdev, "Failed to create debugfs directory\n");
3928                 return;
3929         }
3930
3931         debugfs_create_u32("use_count", 0444, rdev->debugfs,
3932                            &rdev->use_count);
3933         debugfs_create_u32("open_count", 0444, rdev->debugfs,
3934                            &rdev->open_count);
3935         debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3936                            &rdev->bypass_count);
3937 }
3938
3939 static int regulator_register_resolve_supply(struct device *dev, void *data)
3940 {
3941         struct regulator_dev *rdev = dev_to_rdev(dev);
3942
3943         if (regulator_resolve_supply(rdev))
3944                 rdev_dbg(rdev, "unable to resolve supply\n");
3945
3946         return 0;
3947 }
3948
3949 /**
3950  * regulator_register - register regulator
3951  * @regulator_desc: regulator to register
3952  * @cfg: runtime configuration for regulator
3953  *
3954  * Called by regulator drivers to register a regulator.
3955  * Returns a valid pointer to struct regulator_dev on success
3956  * or an ERR_PTR() on error.
3957  */
3958 struct regulator_dev *
3959 regulator_register(const struct regulator_desc *regulator_desc,
3960                    const struct regulator_config *cfg)
3961 {
3962         const struct regulation_constraints *constraints = NULL;
3963         const struct regulator_init_data *init_data;
3964         struct regulator_config *config = NULL;
3965         static atomic_t regulator_no = ATOMIC_INIT(-1);
3966         struct regulator_dev *rdev;
3967         struct device *dev;
3968         int ret, i;
3969
3970         if (regulator_desc == NULL || cfg == NULL)
3971                 return ERR_PTR(-EINVAL);
3972
3973         dev = cfg->dev;
3974         WARN_ON(!dev);
3975
3976         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3977                 return ERR_PTR(-EINVAL);
3978
3979         if (regulator_desc->type != REGULATOR_VOLTAGE &&
3980             regulator_desc->type != REGULATOR_CURRENT)
3981                 return ERR_PTR(-EINVAL);
3982
3983         /* Only one of each should be implemented */
3984         WARN_ON(regulator_desc->ops->get_voltage &&
3985                 regulator_desc->ops->get_voltage_sel);
3986         WARN_ON(regulator_desc->ops->set_voltage &&
3987                 regulator_desc->ops->set_voltage_sel);
3988
3989         /* If we're using selectors we must implement list_voltage. */
3990         if (regulator_desc->ops->get_voltage_sel &&
3991             !regulator_desc->ops->list_voltage) {
3992                 return ERR_PTR(-EINVAL);
3993         }
3994         if (regulator_desc->ops->set_voltage_sel &&
3995             !regulator_desc->ops->list_voltage) {
3996                 return ERR_PTR(-EINVAL);
3997         }
3998
3999         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
4000         if (rdev == NULL)
4001                 return ERR_PTR(-ENOMEM);
4002
4003         /*
4004          * Duplicate the config so the driver could override it after
4005          * parsing init data.
4006          */
4007         config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
4008         if (config == NULL) {
4009                 kfree(rdev);
4010                 return ERR_PTR(-ENOMEM);
4011         }
4012
4013         init_data = regulator_of_get_init_data(dev, regulator_desc, config,
4014                                                &rdev->dev.of_node);
4015         if (!init_data) {
4016                 init_data = config->init_data;
4017                 rdev->dev.of_node = of_node_get(config->of_node);
4018         }
4019
4020         mutex_init(&rdev->mutex);
4021         rdev->reg_data = config->driver_data;
4022         rdev->owner = regulator_desc->owner;
4023         rdev->desc = regulator_desc;
4024         if (config->regmap)
4025                 rdev->regmap = config->regmap;
4026         else if (dev_get_regmap(dev, NULL))
4027                 rdev->regmap = dev_get_regmap(dev, NULL);
4028         else if (dev->parent)
4029                 rdev->regmap = dev_get_regmap(dev->parent, NULL);
4030         INIT_LIST_HEAD(&rdev->consumer_list);
4031         INIT_LIST_HEAD(&rdev->list);
4032         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
4033         INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
4034
4035         /* preform any regulator specific init */
4036         if (init_data && init_data->regulator_init) {
4037                 ret = init_data->regulator_init(rdev->reg_data);
4038                 if (ret < 0)
4039                         goto clean;
4040         }
4041
4042         if ((config->ena_gpio || config->ena_gpio_initialized) &&
4043             gpio_is_valid(config->ena_gpio)) {
4044                 mutex_lock(&regulator_list_mutex);
4045                 ret = regulator_ena_gpio_request(rdev, config);
4046                 mutex_unlock(&regulator_list_mutex);
4047                 if (ret != 0) {
4048                         rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
4049                                  config->ena_gpio, ret);
4050                         goto clean;
4051                 }
4052         }
4053
4054         /* register with sysfs */
4055         rdev->dev.class = &regulator_class;
4056         rdev->dev.parent = dev;
4057         dev_set_name(&rdev->dev, "regulator.%lu",
4058                     (unsigned long) atomic_inc_return(&regulator_no));
4059
4060         /* set regulator constraints */
4061         if (init_data)
4062                 constraints = &init_data->constraints;
4063
4064         if (init_data && init_data->supply_regulator)
4065                 rdev->supply_name = init_data->supply_regulator;
4066         else if (regulator_desc->supply_name)
4067                 rdev->supply_name = regulator_desc->supply_name;
4068
4069         /*
4070          * Attempt to resolve the regulator supply, if specified,
4071          * but don't return an error if we fail because we will try
4072          * to resolve it again later as more regulators are added.
4073          */
4074         if (regulator_resolve_supply(rdev))
4075                 rdev_dbg(rdev, "unable to resolve supply\n");
4076
4077         ret = set_machine_constraints(rdev, constraints);
4078         if (ret < 0)
4079                 goto wash;
4080
4081         /* add consumers devices */
4082         if (init_data) {
4083                 mutex_lock(&regulator_list_mutex);
4084                 for (i = 0; i < init_data->num_consumer_supplies; i++) {
4085                         ret = set_consumer_device_supply(rdev,
4086                                 init_data->consumer_supplies[i].dev_name,
4087                                 init_data->consumer_supplies[i].supply);
4088                         if (ret < 0) {
4089                                 mutex_unlock(&regulator_list_mutex);
4090                                 dev_err(dev, "Failed to set supply %s\n",
4091                                         init_data->consumer_supplies[i].supply);
4092                                 goto unset_supplies;
4093                         }
4094                 }
4095                 mutex_unlock(&regulator_list_mutex);
4096         }
4097
4098         if (!rdev->desc->ops->get_voltage &&
4099             !rdev->desc->ops->list_voltage &&
4100             !rdev->desc->fixed_uV)
4101                 rdev->is_switch = true;
4102
4103         ret = device_register(&rdev->dev);
4104         if (ret != 0) {
4105                 put_device(&rdev->dev);
4106                 goto unset_supplies;
4107         }
4108
4109         dev_set_drvdata(&rdev->dev, rdev);
4110         rdev_init_debugfs(rdev);
4111
4112         /* try to resolve regulators supply since a new one was registered */
4113         class_for_each_device(&regulator_class, NULL, NULL,
4114                               regulator_register_resolve_supply);
4115         kfree(config);
4116         return rdev;
4117
4118 unset_supplies:
4119         mutex_lock(&regulator_list_mutex);
4120         unset_regulator_supplies(rdev);
4121         mutex_unlock(&regulator_list_mutex);
4122 wash:
4123         kfree(rdev->constraints);
4124         mutex_lock(&regulator_list_mutex);
4125         regulator_ena_gpio_free(rdev);
4126         mutex_unlock(&regulator_list_mutex);
4127 clean:
4128         kfree(rdev);
4129         kfree(config);
4130         return ERR_PTR(ret);
4131 }
4132 EXPORT_SYMBOL_GPL(regulator_register);
4133
4134 /**
4135  * regulator_unregister - unregister regulator
4136  * @rdev: regulator to unregister
4137  *
4138  * Called by regulator drivers to unregister a regulator.
4139  */
4140 void regulator_unregister(struct regulator_dev *rdev)
4141 {
4142         if (rdev == NULL)
4143                 return;
4144
4145         if (rdev->supply) {
4146                 while (rdev->use_count--)
4147                         regulator_disable(rdev->supply);
4148                 regulator_put(rdev->supply);
4149         }
4150         mutex_lock(&regulator_list_mutex);
4151         debugfs_remove_recursive(rdev->debugfs);
4152         flush_work(&rdev->disable_work.work);
4153         WARN_ON(rdev->open_count);
4154         unset_regulator_supplies(rdev);
4155         list_del(&rdev->list);
4156         regulator_ena_gpio_free(rdev);
4157         mutex_unlock(&regulator_list_mutex);
4158         device_unregister(&rdev->dev);
4159 }
4160 EXPORT_SYMBOL_GPL(regulator_unregister);
4161
4162 static int _regulator_suspend_prepare(struct device *dev, void *data)
4163 {
4164         struct regulator_dev *rdev = dev_to_rdev(dev);
4165         const suspend_state_t *state = data;
4166         int ret;
4167
4168         mutex_lock(&rdev->mutex);
4169         ret = suspend_prepare(rdev, *state);
4170         mutex_unlock(&rdev->mutex);
4171
4172         return ret;
4173 }
4174
4175 /**
4176  * regulator_suspend_prepare - prepare regulators for system wide suspend
4177  * @state: system suspend state
4178  *
4179  * Configure each regulator with it's suspend operating parameters for state.
4180  * This will usually be called by machine suspend code prior to supending.
4181  */
4182 int regulator_suspend_prepare(suspend_state_t state)
4183 {
4184         /* ON is handled by regulator active state */
4185         if (state == PM_SUSPEND_ON)
4186                 return -EINVAL;
4187
4188         return class_for_each_device(&regulator_class, NULL, &state,
4189                                      _regulator_suspend_prepare);
4190 }
4191 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
4192
4193 static int _regulator_suspend_finish(struct device *dev, void *data)
4194 {
4195         struct regulator_dev *rdev = dev_to_rdev(dev);
4196         int ret;
4197
4198         mutex_lock(&rdev->mutex);
4199         if (rdev->use_count > 0  || rdev->constraints->always_on) {
4200                 if (!_regulator_is_enabled(rdev)) {
4201                         ret = _regulator_do_enable(rdev);
4202                         if (ret)
4203                                 dev_err(dev,
4204                                         "Failed to resume regulator %d\n",
4205                                         ret);
4206                 }
4207         } else {
4208                 if (!have_full_constraints())
4209                         goto unlock;
4210                 if (!_regulator_is_enabled(rdev))
4211                         goto unlock;
4212
4213                 ret = _regulator_do_disable(rdev);
4214                 if (ret)
4215                         dev_err(dev, "Failed to suspend regulator %d\n", ret);
4216         }
4217 unlock:
4218         mutex_unlock(&rdev->mutex);
4219
4220         /* Keep processing regulators in spite of any errors */
4221         return 0;
4222 }
4223
4224 /**
4225  * regulator_suspend_finish - resume regulators from system wide suspend
4226  *
4227  * Turn on regulators that might be turned off by regulator_suspend_prepare
4228  * and that should be turned on according to the regulators properties.
4229  */
4230 int regulator_suspend_finish(void)
4231 {
4232         return class_for_each_device(&regulator_class, NULL, NULL,
4233                                      _regulator_suspend_finish);
4234 }
4235 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
4236
4237 /**
4238  * regulator_has_full_constraints - the system has fully specified constraints
4239  *
4240  * Calling this function will cause the regulator API to disable all
4241  * regulators which have a zero use count and don't have an always_on
4242  * constraint in a late_initcall.
4243  *
4244  * The intention is that this will become the default behaviour in a
4245  * future kernel release so users are encouraged to use this facility
4246  * now.
4247  */
4248 void regulator_has_full_constraints(void)
4249 {
4250         has_full_constraints = 1;
4251 }
4252 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
4253
4254 /**
4255  * rdev_get_drvdata - get rdev regulator driver data
4256  * @rdev: regulator
4257  *
4258  * Get rdev regulator driver private data. This call can be used in the
4259  * regulator driver context.
4260  */
4261 void *rdev_get_drvdata(struct regulator_dev *rdev)
4262 {
4263         return rdev->reg_data;
4264 }
4265 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
4266
4267 /**
4268  * regulator_get_drvdata - get regulator driver data
4269  * @regulator: regulator
4270  *
4271  * Get regulator driver private data. This call can be used in the consumer
4272  * driver context when non API regulator specific functions need to be called.
4273  */
4274 void *regulator_get_drvdata(struct regulator *regulator)
4275 {
4276         return regulator->rdev->reg_data;
4277 }
4278 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
4279
4280 /**
4281  * regulator_set_drvdata - set regulator driver data
4282  * @regulator: regulator
4283  * @data: data
4284  */
4285 void regulator_set_drvdata(struct regulator *regulator, void *data)
4286 {
4287         regulator->rdev->reg_data = data;
4288 }
4289 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
4290
4291 /**
4292  * regulator_get_id - get regulator ID
4293  * @rdev: regulator
4294  */
4295 int rdev_get_id(struct regulator_dev *rdev)
4296 {
4297         return rdev->desc->id;
4298 }
4299 EXPORT_SYMBOL_GPL(rdev_get_id);
4300
4301 struct device *rdev_get_dev(struct regulator_dev *rdev)
4302 {
4303         return &rdev->dev;
4304 }
4305 EXPORT_SYMBOL_GPL(rdev_get_dev);
4306
4307 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
4308 {
4309         return reg_init_data->driver_data;
4310 }
4311 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
4312
4313 #ifdef CONFIG_DEBUG_FS
4314 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
4315                                     size_t count, loff_t *ppos)
4316 {
4317         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
4318         ssize_t len, ret = 0;
4319         struct regulator_map *map;
4320
4321         if (!buf)
4322                 return -ENOMEM;
4323
4324         list_for_each_entry(map, &regulator_map_list, list) {
4325                 len = snprintf(buf + ret, PAGE_SIZE - ret,
4326                                "%s -> %s.%s\n",
4327                                rdev_get_name(map->regulator), map->dev_name,
4328                                map->supply);
4329                 if (len >= 0)
4330                         ret += len;
4331                 if (ret > PAGE_SIZE) {
4332                         ret = PAGE_SIZE;
4333                         break;
4334                 }
4335         }
4336
4337         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
4338
4339         kfree(buf);
4340
4341         return ret;
4342 }
4343 #endif
4344
4345 static const struct file_operations supply_map_fops = {
4346 #ifdef CONFIG_DEBUG_FS
4347         .read = supply_map_read_file,
4348         .llseek = default_llseek,
4349 #endif
4350 };
4351
4352 #ifdef CONFIG_DEBUG_FS
4353 struct summary_data {
4354         struct seq_file *s;
4355         struct regulator_dev *parent;
4356         int level;
4357 };
4358
4359 static void regulator_summary_show_subtree(struct seq_file *s,
4360                                            struct regulator_dev *rdev,
4361                                            int level);
4362
4363 static int regulator_summary_show_children(struct device *dev, void *data)
4364 {
4365         struct regulator_dev *rdev = dev_to_rdev(dev);
4366         struct summary_data *summary_data = data;
4367
4368         if (rdev->supply && rdev->supply->rdev == summary_data->parent)
4369                 regulator_summary_show_subtree(summary_data->s, rdev,
4370                                                summary_data->level + 1);
4371
4372         return 0;
4373 }
4374
4375 static void regulator_summary_show_subtree(struct seq_file *s,
4376                                            struct regulator_dev *rdev,
4377                                            int level)
4378 {
4379         struct regulation_constraints *c;
4380         struct regulator *consumer;
4381         struct summary_data summary_data;
4382
4383         if (!rdev)
4384                 return;
4385
4386         seq_printf(s, "%*s%-*s %3d %4d %6d ",
4387                    level * 3 + 1, "",
4388                    30 - level * 3, rdev_get_name(rdev),
4389                    rdev->use_count, rdev->open_count, rdev->bypass_count);
4390
4391         seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
4392         seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
4393
4394         c = rdev->constraints;
4395         if (c) {
4396                 switch (rdev->desc->type) {
4397                 case REGULATOR_VOLTAGE:
4398                         seq_printf(s, "%5dmV %5dmV ",
4399                                    c->min_uV / 1000, c->max_uV / 1000);
4400                         break;
4401                 case REGULATOR_CURRENT:
4402                         seq_printf(s, "%5dmA %5dmA ",
4403                                    c->min_uA / 1000, c->max_uA / 1000);
4404                         break;
4405                 }
4406         }
4407
4408         seq_puts(s, "\n");
4409
4410         list_for_each_entry(consumer, &rdev->consumer_list, list) {
4411                 if (consumer->dev && consumer->dev->class == &regulator_class)
4412                         continue;
4413
4414                 seq_printf(s, "%*s%-*s ",
4415                            (level + 1) * 3 + 1, "",
4416                            30 - (level + 1) * 3,
4417                            consumer->dev ? dev_name(consumer->dev) : "deviceless");
4418
4419                 switch (rdev->desc->type) {
4420                 case REGULATOR_VOLTAGE:
4421                         seq_printf(s, "%37dmV %5dmV",
4422                                    consumer->min_uV / 1000,
4423                                    consumer->max_uV / 1000);
4424                         break;
4425                 case REGULATOR_CURRENT:
4426                         break;
4427                 }
4428
4429                 seq_puts(s, "\n");
4430         }
4431
4432         summary_data.s = s;
4433         summary_data.level = level;
4434         summary_data.parent = rdev;
4435
4436         class_for_each_device(&regulator_class, NULL, &summary_data,
4437                               regulator_summary_show_children);
4438 }
4439
4440 static int regulator_summary_show_roots(struct device *dev, void *data)
4441 {
4442         struct regulator_dev *rdev = dev_to_rdev(dev);
4443         struct seq_file *s = data;
4444
4445         if (!rdev->supply)
4446                 regulator_summary_show_subtree(s, rdev, 0);
4447
4448         return 0;
4449 }
4450
4451 static int regulator_summary_show(struct seq_file *s, void *data)
4452 {
4453         seq_puts(s, " regulator                      use open bypass voltage current     min     max\n");
4454         seq_puts(s, "-------------------------------------------------------------------------------\n");
4455
4456         class_for_each_device(&regulator_class, NULL, s,
4457                               regulator_summary_show_roots);
4458
4459         return 0;
4460 }
4461
4462 static int regulator_summary_open(struct inode *inode, struct file *file)
4463 {
4464         return single_open(file, regulator_summary_show, inode->i_private);
4465 }
4466 #endif
4467
4468 static const struct file_operations regulator_summary_fops = {
4469 #ifdef CONFIG_DEBUG_FS
4470         .open           = regulator_summary_open,
4471         .read           = seq_read,
4472         .llseek         = seq_lseek,
4473         .release        = single_release,
4474 #endif
4475 };
4476
4477 static int __init regulator_init(void)
4478 {
4479         int ret;
4480
4481         ret = class_register(&regulator_class);
4482
4483         debugfs_root = debugfs_create_dir("regulator", NULL);
4484         if (!debugfs_root)
4485                 pr_warn("regulator: Failed to create debugfs directory\n");
4486
4487         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
4488                             &supply_map_fops);
4489
4490         debugfs_create_file("regulator_summary", 0444, debugfs_root,
4491                             NULL, &regulator_summary_fops);
4492
4493         regulator_dummy_init();
4494
4495         return ret;
4496 }
4497
4498 /* init early to allow our consumers to complete system booting */
4499 core_initcall(regulator_init);
4500
4501 static int __init regulator_late_cleanup(struct device *dev, void *data)
4502 {
4503         struct regulator_dev *rdev = dev_to_rdev(dev);
4504         const struct regulator_ops *ops = rdev->desc->ops;
4505         struct regulation_constraints *c = rdev->constraints;
4506         int enabled, ret;
4507
4508         if (c && c->always_on)
4509                 return 0;
4510
4511         if (!regulator_ops_is_valid(rdev, REGULATOR_CHANGE_STATUS))
4512                 return 0;
4513
4514         mutex_lock(&rdev->mutex);
4515
4516         if (rdev->use_count)
4517                 goto unlock;
4518
4519         /* If we can't read the status assume it's on. */
4520         if (ops->is_enabled)
4521                 enabled = ops->is_enabled(rdev);
4522         else
4523                 enabled = 1;
4524
4525         if (!enabled)
4526                 goto unlock;
4527
4528         if (have_full_constraints()) {
4529                 /* We log since this may kill the system if it goes
4530                  * wrong. */
4531                 rdev_info(rdev, "disabling\n");
4532                 ret = _regulator_do_disable(rdev);
4533                 if (ret != 0)
4534                         rdev_err(rdev, "couldn't disable: %d\n", ret);
4535         } else {
4536                 /* The intention is that in future we will
4537                  * assume that full constraints are provided
4538                  * so warn even if we aren't going to do
4539                  * anything here.
4540                  */
4541                 rdev_warn(rdev, "incomplete constraints, leaving on\n");
4542         }
4543
4544 unlock:
4545         mutex_unlock(&rdev->mutex);
4546
4547         return 0;
4548 }
4549
4550 static int __init regulator_init_complete(void)
4551 {
4552         /*
4553          * Since DT doesn't provide an idiomatic mechanism for
4554          * enabling full constraints and since it's much more natural
4555          * with DT to provide them just assume that a DT enabled
4556          * system has full constraints.
4557          */
4558         if (of_have_populated_dt())
4559                 has_full_constraints = true;
4560
4561         /*
4562          * Regulators may had failed to resolve their input supplies
4563          * when were registered, either because the input supply was
4564          * not registered yet or because its parent device was not
4565          * bound yet. So attempt to resolve the input supplies for
4566          * pending regulators before trying to disable unused ones.
4567          */
4568         class_for_each_device(&regulator_class, NULL, NULL,
4569                               regulator_register_resolve_supply);
4570
4571         /* If we have a full configuration then disable any regulators
4572          * we have permission to change the status for and which are
4573          * not in use or always_on.  This is effectively the default
4574          * for DT and ACPI as they have full constraints.
4575          */
4576         class_for_each_device(&regulator_class, NULL, NULL,
4577                               regulator_late_cleanup);
4578
4579         return 0;
4580 }
4581 late_initcall_sync(regulator_init_complete);