drivers/regulator/core.c

   1 /*
   2  * core.c  --  Voltage/Current Regulator framework.
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  * Copyright 2008 SlimLogic Ltd.
   6  *
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/debugfs.h>
  19 #include <linux/device.h>
  20 #include <linux/slab.h>
  21 #include <linux/async.h>
  22 #include <linux/err.h>
  23 #include <linux/mutex.h>
  24 #include <linux/suspend.h>
  25 #include <linux/delay.h>
  26 #include <linux/gpio.h>
  27 #include <linux/of.h>
  28 #include <linux/regmap.h>
  29 #include <linux/regulator/of_regulator.h>
  30 #include <linux/regulator/consumer.h>
  31 #include <linux/regulator/driver.h>
  32 #include <linux/regulator/machine.h>
  33 #include <linux/module.h>
  34
  35 #define CREATE_TRACE_POINTS
  36 #include <trace/events/regulator.h>
  37
  38 #include "dummy.h"
  39 #include "internal.h"
  40
  41 #define rdev_crit(rdev, fmt, ...)                                       \
  42         pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  43 #define rdev_err(rdev, fmt, ...)                                        \
  44         pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  45 #define rdev_warn(rdev, fmt, ...)                                       \
  46         pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  47 #define rdev_info(rdev, fmt, ...)                                       \
  48         pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  49 #define rdev_dbg(rdev, fmt, ...)                                        \
  50         pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
  51
  52 static DEFINE_MUTEX(regulator_list_mutex);
  53 static LIST_HEAD(regulator_list);
  54 static LIST_HEAD(regulator_map_list);
  55 static LIST_HEAD(regulator_ena_gpio_list);
  56 static LIST_HEAD(regulator_supply_alias_list);
  57 static bool has_full_constraints;
  58
  59 static struct dentry *debugfs_root;
  60
  61 /*
  62  * struct regulator_map
  63  *
  64  * Used to provide symbolic supply names to devices.
  65  */
  66 struct regulator_map {
  67         struct list_head list;
  68         const char *dev_name;   /* The dev_name() for the consumer */
  69         const char *supply;
  70         struct regulator_dev *regulator;
  71 };
  72
  73 /*
  74  * struct regulator_enable_gpio
  75  *
  76  * Management for shared enable GPIO pin
  77  */
  78 struct regulator_enable_gpio {
  79         struct list_head list;
  80         int gpio;
  81         u32 enable_count;       /* a number of enabled shared GPIO */
  82         u32 request_count;      /* a number of requested shared GPIO */
  83         unsigned int ena_gpio_invert:1;
  84 };
  85
  86 /*
  87  * struct regulator_supply_alias
  88  *
  89  * Used to map lookups for a supply onto an alternative device.
  90  */
  91 struct regulator_supply_alias {
  92         struct list_head list;
  93         struct device *src_dev;
  94         const char *src_supply;
  95         struct device *alias_dev;
  96         const char *alias_supply;
  97 };
  98
  99 static int _regulator_is_enabled(struct regulator_dev *rdev);
 100 static int _regulator_disable(struct regulator_dev *rdev);
 101 static int _regulator_get_voltage(struct regulator_dev *rdev);
 102 static int _regulator_get_current_limit(struct regulator_dev *rdev);
 103 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
 104 static void _notifier_call_chain(struct regulator_dev *rdev,
 105                                   unsigned long event, void *data);
 106 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
 107                                      int min_uV, int max_uV);
 108 static struct regulator *create_regulator(struct regulator_dev *rdev,
 109                                           struct device *dev,
 110                                           const char *supply_name);
 111
 112 static const char *rdev_get_name(struct regulator_dev *rdev)
 113 {
 114         if (rdev->constraints && rdev->constraints->name)
 115                 return rdev->constraints->name;
 116         else if (rdev->desc->name)
 117                 return rdev->desc->name;
 118         else
 119                 return "";
 120 }
 121
 122 static bool have_full_constraints(void)
 123 {
 124         return has_full_constraints || of_have_populated_dt();
 125 }
 126
 127 /**
 128  * of_get_regulator - get a regulator device node based on supply name
 129  * @dev: Device pointer for the consumer (of regulator) device
 130  * @supply: regulator supply name
 131  *
 132  * Extract the regulator device node corresponding to the supply name.
 133  * returns the device node corresponding to the regulator if found, else
 134  * returns NULL.
 135  */
 136 static struct device_node *of_get_regulator(struct device *dev, const char *supply)
 137 {
 138         struct device_node *regnode = NULL;
 139         char prop_name[32]; /* 32 is max size of property name */
 140
 141         dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
 142
 143         snprintf(prop_name, 32, "%s-supply", supply);
 144         regnode = of_parse_phandle(dev->of_node, prop_name, 0);
 145
 146         if (!regnode) {
 147                 dev_dbg(dev, "Looking up %s property in node %s failed",
 148                                 prop_name, dev->of_node->full_name);
 149                 return NULL;
 150         }
 151         return regnode;
 152 }
 153
 154 static int _regulator_can_change_status(struct regulator_dev *rdev)
 155 {
 156         if (!rdev->constraints)
 157                 return 0;
 158
 159         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
 160                 return 1;
 161         else
 162                 return 0;
 163 }
 164
 165 /* Platform voltage constraint check */
 166 static int regulator_check_voltage(struct regulator_dev *rdev,
 167                                    int *min_uV, int *max_uV)
 168 {
 169         BUG_ON(*min_uV > *max_uV);
 170
 171         if (!rdev->constraints) {
 172                 rdev_err(rdev, "no constraints\n");
 173                 return -ENODEV;
 174         }
 175         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 176                 rdev_err(rdev, "operation not allowed\n");
 177                 return -EPERM;
 178         }
 179
 180         if (*max_uV > rdev->constraints->max_uV)
 181                 *max_uV = rdev->constraints->max_uV;
 182         if (*min_uV < rdev->constraints->min_uV)
 183                 *min_uV = rdev->constraints->min_uV;
 184
 185         if (*min_uV > *max_uV) {
 186                 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
 187                          *min_uV, *max_uV);
 188                 return -EINVAL;
 189         }
 190
 191         return 0;
 192 }
 193
 194 /* Make sure we select a voltage that suits the needs of all
 195  * regulator consumers
 196  */
 197 static int regulator_check_consumers(struct regulator_dev *rdev,
 198                                      int *min_uV, int *max_uV)
 199 {
 200         struct regulator *regulator;
 201
 202         list_for_each_entry(regulator, &rdev->consumer_list, list) {
 203                 /*
 204                  * Assume consumers that didn't say anything are OK
 205                  * with anything in the constraint range.
 206                  */
 207                 if (!regulator->min_uV && !regulator->max_uV)
 208                         continue;
 209
 210                 if (*max_uV > regulator->max_uV)
 211                         *max_uV = regulator->max_uV;
 212                 if (*min_uV < regulator->min_uV)
 213                         *min_uV = regulator->min_uV;
 214         }
 215
 216         if (*min_uV > *max_uV) {
 217                 rdev_err(rdev, "Restricting voltage, %u-%uuV\n",
 218                         *min_uV, *max_uV);
 219                 return -EINVAL;
 220         }
 221
 222         return 0;
 223 }
 224
 225 /* current constraint check */
 226 static int regulator_check_current_limit(struct regulator_dev *rdev,
 227                                         int *min_uA, int *max_uA)
 228 {
 229         BUG_ON(*min_uA > *max_uA);
 230
 231         if (!rdev->constraints) {
 232                 rdev_err(rdev, "no constraints\n");
 233                 return -ENODEV;
 234         }
 235         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 236                 rdev_err(rdev, "operation not allowed\n");
 237                 return -EPERM;
 238         }
 239
 240         if (*max_uA > rdev->constraints->max_uA)
 241                 *max_uA = rdev->constraints->max_uA;
 242         if (*min_uA < rdev->constraints->min_uA)
 243                 *min_uA = rdev->constraints->min_uA;
 244
 245         if (*min_uA > *max_uA) {
 246                 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
 247                          *min_uA, *max_uA);
 248                 return -EINVAL;
 249         }
 250
 251         return 0;
 252 }
 253
 254 /* operating mode constraint check */
 255 static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
 256 {
 257         switch (*mode) {
 258         case REGULATOR_MODE_FAST:
 259         case REGULATOR_MODE_NORMAL:
 260         case REGULATOR_MODE_IDLE:
 261         case REGULATOR_MODE_STANDBY:
 262                 break;
 263         default:
 264                 rdev_err(rdev, "invalid mode %x specified\n", *mode);
 265                 return -EINVAL;
 266         }
 267
 268         if (!rdev->constraints) {
 269                 rdev_err(rdev, "no constraints\n");
 270                 return -ENODEV;
 271         }
 272         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 273                 rdev_err(rdev, "operation not allowed\n");
 274                 return -EPERM;
 275         }
 276
 277         /* The modes are bitmasks, the most power hungry modes having
 278          * the lowest values. If the requested mode isn't supported
 279          * try higher modes. */
 280         while (*mode) {
 281                 if (rdev->constraints->valid_modes_mask & *mode)
 282                         return 0;
 283                 *mode /= 2;
 284         }
 285
 286         return -EINVAL;
 287 }
 288
 289 /* dynamic regulator mode switching constraint check */
 290 static int regulator_check_drms(struct regulator_dev *rdev)
 291 {
 292         if (!rdev->constraints) {
 293                 rdev_err(rdev, "no constraints\n");
 294                 return -ENODEV;
 295         }
 296         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 297                 rdev_err(rdev, "operation not allowed\n");
 298                 return -EPERM;
 299         }
 300         return 0;
 301 }
 302
 303 static ssize_t regulator_uV_show(struct device *dev,
 304                                 struct device_attribute *attr, char *buf)
 305 {
 306         struct regulator_dev *rdev = dev_get_drvdata(dev);
 307         ssize_t ret;
 308
 309         mutex_lock(&rdev->mutex);
 310         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 311         mutex_unlock(&rdev->mutex);
 312
 313         return ret;
 314 }
 315 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 316
 317 static ssize_t regulator_uA_show(struct device *dev,
 318                                 struct device_attribute *attr, char *buf)
 319 {
 320         struct regulator_dev *rdev = dev_get_drvdata(dev);
 321
 322         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 323 }
 324 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 325
 326 static ssize_t name_show(struct device *dev, struct device_attribute *attr,
 327                          char *buf)
 328 {
 329         struct regulator_dev *rdev = dev_get_drvdata(dev);
 330
 331         return sprintf(buf, "%s\n", rdev_get_name(rdev));
 332 }
 333 static DEVICE_ATTR_RO(name);
 334
 335 static ssize_t regulator_print_opmode(char *buf, int mode)
 336 {
 337         switch (mode) {
 338         case REGULATOR_MODE_FAST:
 339                 return sprintf(buf, "fast\n");
 340         case REGULATOR_MODE_NORMAL:
 341                 return sprintf(buf, "normal\n");
 342         case REGULATOR_MODE_IDLE:
 343                 return sprintf(buf, "idle\n");
 344         case REGULATOR_MODE_STANDBY:
 345                 return sprintf(buf, "standby\n");
 346         }
 347         return sprintf(buf, "unknown\n");
 348 }
 349
 350 static ssize_t regulator_opmode_show(struct device *dev,
 351                                     struct device_attribute *attr, char *buf)
 352 {
 353         struct regulator_dev *rdev = dev_get_drvdata(dev);
 354
 355         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 356 }
 357 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 358
 359 static ssize_t regulator_print_state(char *buf, int state)
 360 {
 361         if (state > 0)
 362                 return sprintf(buf, "enabled\n");
 363         else if (state == 0)
 364                 return sprintf(buf, "disabled\n");
 365         else
 366                 return sprintf(buf, "unknown\n");
 367 }
 368
 369 static ssize_t regulator_state_show(struct device *dev,
 370                                    struct device_attribute *attr, char *buf)
 371 {
 372         struct regulator_dev *rdev = dev_get_drvdata(dev);
 373         ssize_t ret;
 374
 375         mutex_lock(&rdev->mutex);
 376         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 377         mutex_unlock(&rdev->mutex);
 378
 379         return ret;
 380 }
 381 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 382
 383 static ssize_t regulator_status_show(struct device *dev,
 384                                    struct device_attribute *attr, char *buf)
 385 {
 386         struct regulator_dev *rdev = dev_get_drvdata(dev);
 387         int status;
 388         char *label;
 389
 390         status = rdev->desc->ops->get_status(rdev);
 391         if (status < 0)
 392                 return status;
 393
 394         switch (status) {
 395         case REGULATOR_STATUS_OFF:
 396                 label = "off";
 397                 break;
 398         case REGULATOR_STATUS_ON:
 399                 label = "on";
 400                 break;
 401         case REGULATOR_STATUS_ERROR:
 402                 label = "error";
 403                 break;
 404         case REGULATOR_STATUS_FAST:
 405                 label = "fast";
 406                 break;
 407         case REGULATOR_STATUS_NORMAL:
 408                 label = "normal";
 409                 break;
 410         case REGULATOR_STATUS_IDLE:
 411                 label = "idle";
 412                 break;
 413         case REGULATOR_STATUS_STANDBY:
 414                 label = "standby";
 415                 break;
 416         case REGULATOR_STATUS_BYPASS:
 417                 label = "bypass";
 418                 break;
 419         case REGULATOR_STATUS_UNDEFINED:
 420                 label = "undefined";
 421                 break;
 422         default:
 423                 return -ERANGE;
 424         }
 425
 426         return sprintf(buf, "%s\n", label);
 427 }
 428 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 429
 430 static ssize_t regulator_min_uA_show(struct device *dev,
 431                                     struct device_attribute *attr, char *buf)
 432 {
 433         struct regulator_dev *rdev = dev_get_drvdata(dev);
 434
 435         if (!rdev->constraints)
 436                 return sprintf(buf, "constraint not defined\n");
 437
 438         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 439 }
 440 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 441
 442 static ssize_t regulator_max_uA_show(struct device *dev,
 443                                     struct device_attribute *attr, char *buf)
 444 {
 445         struct regulator_dev *rdev = dev_get_drvdata(dev);
 446
 447         if (!rdev->constraints)
 448                 return sprintf(buf, "constraint not defined\n");
 449
 450         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 451 }
 452 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 453
 454 static ssize_t regulator_min_uV_show(struct device *dev,
 455                                     struct device_attribute *attr, char *buf)
 456 {
 457         struct regulator_dev *rdev = dev_get_drvdata(dev);
 458
 459         if (!rdev->constraints)
 460                 return sprintf(buf, "constraint not defined\n");
 461
 462         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 463 }
 464 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 465
 466 static ssize_t regulator_max_uV_show(struct device *dev,
 467                                     struct device_attribute *attr, char *buf)
 468 {
 469         struct regulator_dev *rdev = dev_get_drvdata(dev);
 470
 471         if (!rdev->constraints)
 472                 return sprintf(buf, "constraint not defined\n");
 473
 474         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 475 }
 476 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 477
 478 static ssize_t regulator_total_uA_show(struct device *dev,
 479                                       struct device_attribute *attr, char *buf)
 480 {
 481         struct regulator_dev *rdev = dev_get_drvdata(dev);
 482         struct regulator *regulator;
 483         int uA = 0;
 484
 485         mutex_lock(&rdev->mutex);
 486         list_for_each_entry(regulator, &rdev->consumer_list, list)
 487                 uA += regulator->uA_load;
 488         mutex_unlock(&rdev->mutex);
 489         return sprintf(buf, "%d\n", uA);
 490 }
 491 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 492
 493 static ssize_t num_users_show(struct device *dev, struct device_attribute *attr,
 494                               char *buf)
 495 {
 496         struct regulator_dev *rdev = dev_get_drvdata(dev);
 497         return sprintf(buf, "%d\n", rdev->use_count);
 498 }
 499 static DEVICE_ATTR_RO(num_users);
 500
 501 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
 502                          char *buf)
 503 {
 504         struct regulator_dev *rdev = dev_get_drvdata(dev);
 505
 506         switch (rdev->desc->type) {
 507         case REGULATOR_VOLTAGE:
 508                 return sprintf(buf, "voltage\n");
 509         case REGULATOR_CURRENT:
 510                 return sprintf(buf, "current\n");
 511         }
 512         return sprintf(buf, "unknown\n");
 513 }
 514 static DEVICE_ATTR_RO(type);
 515
 516 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 517                                 struct device_attribute *attr, char *buf)
 518 {
 519         struct regulator_dev *rdev = dev_get_drvdata(dev);
 520
 521         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 522 }
 523 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 524                 regulator_suspend_mem_uV_show, NULL);
 525
 526 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 527                                 struct device_attribute *attr, char *buf)
 528 {
 529         struct regulator_dev *rdev = dev_get_drvdata(dev);
 530
 531         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 532 }
 533 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 534                 regulator_suspend_disk_uV_show, NULL);
 535
 536 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 537                                 struct device_attribute *attr, char *buf)
 538 {
 539         struct regulator_dev *rdev = dev_get_drvdata(dev);
 540
 541         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 542 }
 543 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 544                 regulator_suspend_standby_uV_show, NULL);
 545
 546 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 547                                 struct device_attribute *attr, char *buf)
 548 {
 549         struct regulator_dev *rdev = dev_get_drvdata(dev);
 550
 551         return regulator_print_opmode(buf,
 552                 rdev->constraints->state_mem.mode);
 553 }
 554 static DEVICE_ATTR(suspend_mem_mode, 0444,
 555                 regulator_suspend_mem_mode_show, NULL);
 556
 557 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 558                                 struct device_attribute *attr, char *buf)
 559 {
 560         struct regulator_dev *rdev = dev_get_drvdata(dev);
 561
 562         return regulator_print_opmode(buf,
 563                 rdev->constraints->state_disk.mode);
 564 }
 565 static DEVICE_ATTR(suspend_disk_mode, 0444,
 566                 regulator_suspend_disk_mode_show, NULL);
 567
 568 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 569                                 struct device_attribute *attr, char *buf)
 570 {
 571         struct regulator_dev *rdev = dev_get_drvdata(dev);
 572
 573         return regulator_print_opmode(buf,
 574                 rdev->constraints->state_standby.mode);
 575 }
 576 static DEVICE_ATTR(suspend_standby_mode, 0444,
 577                 regulator_suspend_standby_mode_show, NULL);
 578
 579 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 580                                    struct device_attribute *attr, char *buf)
 581 {
 582         struct regulator_dev *rdev = dev_get_drvdata(dev);
 583
 584         return regulator_print_state(buf,
 585                         rdev->constraints->state_mem.enabled);
 586 }
 587 static DEVICE_ATTR(suspend_mem_state, 0444,
 588                 regulator_suspend_mem_state_show, NULL);
 589
 590 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 591                                    struct device_attribute *attr, char *buf)
 592 {
 593         struct regulator_dev *rdev = dev_get_drvdata(dev);
 594
 595         return regulator_print_state(buf,
 596                         rdev->constraints->state_disk.enabled);
 597 }
 598 static DEVICE_ATTR(suspend_disk_state, 0444,
 599                 regulator_suspend_disk_state_show, NULL);
 600
 601 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 602                                    struct device_attribute *attr, char *buf)
 603 {
 604         struct regulator_dev *rdev = dev_get_drvdata(dev);
 605
 606         return regulator_print_state(buf,
 607                         rdev->constraints->state_standby.enabled);
 608 }
 609 static DEVICE_ATTR(suspend_standby_state, 0444,
 610                 regulator_suspend_standby_state_show, NULL);
 611
 612 static ssize_t regulator_bypass_show(struct device *dev,
 613                                      struct device_attribute *attr, char *buf)
 614 {
 615         struct regulator_dev *rdev = dev_get_drvdata(dev);
 616         const char *report;
 617         bool bypass;
 618         int ret;
 619
 620         ret = rdev->desc->ops->get_bypass(rdev, &bypass);
 621
 622         if (ret != 0)
 623                 report = "unknown";
 624         else if (bypass)
 625                 report = "enabled";
 626         else
 627                 report = "disabled";
 628
 629         return sprintf(buf, "%s\n", report);
 630 }
 631 static DEVICE_ATTR(bypass, 0444,
 632                    regulator_bypass_show, NULL);
 633
 634 /*
 635  * These are the only attributes are present for all regulators.
 636  * Other attributes are a function of regulator functionality.
 637  */
 638 static struct attribute *regulator_dev_attrs[] = {
 639         &dev_attr_name.attr,
 640         &dev_attr_num_users.attr,
 641         &dev_attr_type.attr,
 642         NULL,
 643 };
 644 ATTRIBUTE_GROUPS(regulator_dev);
 645
 646 static void regulator_dev_release(struct device *dev)
 647 {
 648         struct regulator_dev *rdev = dev_get_drvdata(dev);
 649         kfree(rdev);
 650 }
 651
 652 static struct class regulator_class = {
 653         .name = "regulator",
 654         .dev_release = regulator_dev_release,
 655         .dev_groups = regulator_dev_groups,
 656 };
 657
 658 /* Calculate the new optimum regulator operating mode based on the new total
 659  * consumer load. All locks held by caller */
 660 static void drms_uA_update(struct regulator_dev *rdev)
 661 {
 662         struct regulator *sibling;
 663         int current_uA = 0, output_uV, input_uV, err;
 664         unsigned int mode;
 665
 666         err = regulator_check_drms(rdev);
 667         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 668             (!rdev->desc->ops->get_voltage &&
 669              !rdev->desc->ops->get_voltage_sel) ||
 670             !rdev->desc->ops->set_mode)
 671                 return;
 672
 673         /* get output voltage */
 674         output_uV = _regulator_get_voltage(rdev);
 675         if (output_uV <= 0)
 676                 return;
 677
 678         /* get input voltage */
 679         input_uV = 0;
 680         if (rdev->supply)
 681                 input_uV = regulator_get_voltage(rdev->supply);
 682         if (input_uV <= 0)
 683                 input_uV = rdev->constraints->input_uV;
 684         if (input_uV <= 0)
 685                 return;
 686
 687         /* calc total requested load */
 688         list_for_each_entry(sibling, &rdev->consumer_list, list)
 689                 current_uA += sibling->uA_load;
 690
 691         /* now get the optimum mode for our new total regulator load */
 692         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 693                                                   output_uV, current_uA);
 694
 695         /* check the new mode is allowed */
 696         err = regulator_mode_constrain(rdev, &mode);
 697         if (err == 0)
 698                 rdev->desc->ops->set_mode(rdev, mode);
 699 }
 700
 701 static int suspend_set_state(struct regulator_dev *rdev,
 702         struct regulator_state *rstate)
 703 {
 704         int ret = 0;
 705
 706         /* If we have no suspend mode configration don't set anything;
 707          * only warn if the driver implements set_suspend_voltage or
 708          * set_suspend_mode callback.
 709          */
 710         if (!rstate->enabled && !rstate->disabled) {
 711                 if (rdev->desc->ops->set_suspend_voltage ||
 712                     rdev->desc->ops->set_suspend_mode)
 713                         rdev_warn(rdev, "No configuration\n");
 714                 return 0;
 715         }
 716
 717         if (rstate->enabled && rstate->disabled) {
 718                 rdev_err(rdev, "invalid configuration\n");
 719                 return -EINVAL;
 720         }
 721
 722         if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
 723                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 724         else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
 725                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 726         else /* OK if set_suspend_enable or set_suspend_disable is NULL */
 727                 ret = 0;
 728
 729         if (ret < 0) {
 730                 rdev_err(rdev, "failed to enabled/disable\n");
 731                 return ret;
 732         }
 733
 734         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 735                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 736                 if (ret < 0) {
 737                         rdev_err(rdev, "failed to set voltage\n");
 738                         return ret;
 739                 }
 740         }
 741
 742         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 743                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 744                 if (ret < 0) {
 745                         rdev_err(rdev, "failed to set mode\n");
 746                         return ret;
 747                 }
 748         }
 749         return ret;
 750 }
 751
 752 /* locks held by caller */
 753 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 754 {
 755         if (!rdev->constraints)
 756                 return -EINVAL;
 757
 758         switch (state) {
 759         case PM_SUSPEND_STANDBY:
 760                 return suspend_set_state(rdev,
 761                         &rdev->constraints->state_standby);
 762         case PM_SUSPEND_MEM:
 763                 return suspend_set_state(rdev,
 764                         &rdev->constraints->state_mem);
 765         case PM_SUSPEND_MAX:
 766                 return suspend_set_state(rdev,
 767                         &rdev->constraints->state_disk);
 768         default:
 769                 return -EINVAL;
 770         }
 771 }
 772
 773 static void print_constraints(struct regulator_dev *rdev)
 774 {
 775         struct regulation_constraints *constraints = rdev->constraints;
 776         char buf[80] = "";
 777         int count = 0;
 778         int ret;
 779
 780         if (constraints->min_uV && constraints->max_uV) {
 781                 if (constraints->min_uV == constraints->max_uV)
 782                         count += sprintf(buf + count, "%d mV ",
 783                                          constraints->min_uV / 1000);
 784                 else
 785                         count += sprintf(buf + count, "%d <--> %d mV ",
 786                                          constraints->min_uV / 1000,
 787                                          constraints->max_uV / 1000);
 788         }
 789
 790         if (!constraints->min_uV ||
 791             constraints->min_uV != constraints->max_uV) {
 792                 ret = _regulator_get_voltage(rdev);
 793                 if (ret > 0)
 794                         count += sprintf(buf + count, "at %d mV ", ret / 1000);
 795         }
 796
 797         if (constraints->uV_offset)
 798                 count += sprintf(buf, "%dmV offset ",
 799                                  constraints->uV_offset / 1000);
 800
 801         if (constraints->min_uA && constraints->max_uA) {
 802                 if (constraints->min_uA == constraints->max_uA)
 803                         count += sprintf(buf + count, "%d mA ",
 804                                          constraints->min_uA / 1000);
 805                 else
 806                         count += sprintf(buf + count, "%d <--> %d mA ",
 807                                          constraints->min_uA / 1000,
 808                                          constraints->max_uA / 1000);
 809         }
 810
 811         if (!constraints->min_uA ||
 812             constraints->min_uA != constraints->max_uA) {
 813                 ret = _regulator_get_current_limit(rdev);
 814                 if (ret > 0)
 815                         count += sprintf(buf + count, "at %d mA ", ret / 1000);
 816         }
 817
 818         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 819                 count += sprintf(buf + count, "fast ");
 820         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 821                 count += sprintf(buf + count, "normal ");
 822         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 823                 count += sprintf(buf + count, "idle ");
 824         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 825                 count += sprintf(buf + count, "standby");
 826
 827         if (!count)
 828                 sprintf(buf, "no parameters");
 829
 830         rdev_info(rdev, "%s\n", buf);
 831
 832         if ((constraints->min_uV != constraints->max_uV) &&
 833             !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
 834                 rdev_warn(rdev,
 835                           "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
 836 }
 837
 838 static int machine_constraints_voltage(struct regulator_dev *rdev,
 839         struct regulation_constraints *constraints)
 840 {
 841         struct regulator_ops *ops = rdev->desc->ops;
 842         int ret;
 843
 844         /* do we need to apply the constraint voltage */
 845         if (rdev->constraints->apply_uV &&
 846             rdev->constraints->min_uV == rdev->constraints->max_uV) {
 847                 int current_uV = _regulator_get_voltage(rdev);
 848                 if (current_uV < 0) {
 849                         rdev_err(rdev, "failed to get the current voltage\n");
 850                         return current_uV;
 851                 }
 852                 if (current_uV < rdev->constraints->min_uV ||
 853                     current_uV > rdev->constraints->max_uV) {
 854                         ret = _regulator_do_set_voltage(
 855                                 rdev, rdev->constraints->min_uV,
 856                                 rdev->constraints->max_uV);
 857                         if (ret < 0) {
 858                                 rdev_err(rdev,
 859                                         "failed to apply %duV constraint\n",
 860                                         rdev->constraints->min_uV);
 861                                 return ret;
 862                         }
 863                 }
 864         }
 865
 866         /* constrain machine-level voltage specs to fit
 867          * the actual range supported by this regulator.
 868          */
 869         if (ops->list_voltage && rdev->desc->n_voltages) {
 870                 int     count = rdev->desc->n_voltages;
 871                 int     i;
 872                 int     min_uV = INT_MAX;
 873                 int     max_uV = INT_MIN;
 874                 int     cmin = constraints->min_uV;
 875                 int     cmax = constraints->max_uV;
 876
 877                 /* it's safe to autoconfigure fixed-voltage supplies
 878                    and the constraints are used by list_voltage. */
 879                 if (count == 1 && !cmin) {
 880                         cmin = 1;
 881                         cmax = INT_MAX;
 882                         constraints->min_uV = cmin;
 883                         constraints->max_uV = cmax;
 884                 }
 885
 886                 /* voltage constraints are optional */
 887                 if ((cmin == 0) && (cmax == 0))
 888                         return 0;
 889
 890                 /* else require explicit machine-level constraints */
 891                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 892                         rdev_err(rdev, "invalid voltage constraints\n");
 893                         return -EINVAL;
 894                 }
 895
 896                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 897                 for (i = 0; i < count; i++) {
 898                         int     value;
 899
 900                         value = ops->list_voltage(rdev, i);
 901                         if (value <= 0)
 902                                 continue;
 903
 904                         /* maybe adjust [min_uV..max_uV] */
 905                         if (value >= cmin && value < min_uV)
 906                                 min_uV = value;
 907                         if (value <= cmax && value > max_uV)
 908                                 max_uV = value;
 909                 }
 910
 911                 /* final: [min_uV..max_uV] valid iff constraints valid */
 912                 if (max_uV < min_uV) {
 913                         rdev_err(rdev,
 914                                  "unsupportable voltage constraints %u-%uuV\n",
 915                                  min_uV, max_uV);
 916                         return -EINVAL;
 917                 }
 918
 919                 /* use regulator's subset of machine constraints */
 920                 if (constraints->min_uV < min_uV) {
 921                         rdev_dbg(rdev, "override min_uV, %d -> %d\n",
 922                                  constraints->min_uV, min_uV);
 923                         constraints->min_uV = min_uV;
 924                 }
 925                 if (constraints->max_uV > max_uV) {
 926                         rdev_dbg(rdev, "override max_uV, %d -> %d\n",
 927                                  constraints->max_uV, max_uV);
 928                         constraints->max_uV = max_uV;
 929                 }
 930         }
 931
 932         return 0;
 933 }
 934
 935 static int machine_constraints_current(struct regulator_dev *rdev,
 936         struct regulation_constraints *constraints)
 937 {
 938         struct regulator_ops *ops = rdev->desc->ops;
 939         int ret;
 940
 941         if (!constraints->min_uA && !constraints->max_uA)
 942                 return 0;
 943
 944         if (constraints->min_uA > constraints->max_uA) {
 945                 rdev_err(rdev, "Invalid current constraints\n");
 946                 return -EINVAL;
 947         }
 948
 949         if (!ops->set_current_limit || !ops->get_current_limit) {
 950                 rdev_warn(rdev, "Operation of current configuration missing\n");
 951                 return 0;
 952         }
 953
 954         /* Set regulator current in constraints range */
 955         ret = ops->set_current_limit(rdev, constraints->min_uA,
 956                         constraints->max_uA);
 957         if (ret < 0) {
 958                 rdev_err(rdev, "Failed to set current constraint, %d\n", ret);
 959                 return ret;
 960         }
 961
 962         return 0;
 963 }
 964
 965 static int _regulator_do_enable(struct regulator_dev *rdev);
 966
 967 /**
 968  * set_machine_constraints - sets regulator constraints
 969  * @rdev: regulator source
 970  * @constraints: constraints to apply
 971  *
 972  * Allows platform initialisation code to define and constrain
 973  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 974  * Constraints *must* be set by platform code in order for some
 975  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 976  * set_mode.
 977  */
 978 static int set_machine_constraints(struct regulator_dev *rdev,
 979         const struct regulation_constraints *constraints)
 980 {
 981         int ret = 0;
 982         struct regulator_ops *ops = rdev->desc->ops;
 983
 984         if (constraints)
 985                 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
 986                                             GFP_KERNEL);
 987         else
 988                 rdev->constraints = kzalloc(sizeof(*constraints),
 989                                             GFP_KERNEL);
 990         if (!rdev->constraints)
 991                 return -ENOMEM;
 992
 993         ret = machine_constraints_voltage(rdev, rdev->constraints);
 994         if (ret != 0)
 995                 goto out;
 996
 997         ret = machine_constraints_current(rdev, rdev->constraints);
 998         if (ret != 0)
 999                 goto out;
1000
1001         /* do we need to setup our suspend state */
1002         if (rdev->constraints->initial_state) {
1003                 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
1004                 if (ret < 0) {
1005                         rdev_err(rdev, "failed to set suspend state\n");
1006                         goto out;
1007                 }
1008         }
1009
1010         if (rdev->constraints->initial_mode) {
1011                 if (!ops->set_mode) {
1012                         rdev_err(rdev, "no set_mode operation\n");
1013                         ret = -EINVAL;
1014                         goto out;
1015                 }
1016
1017                 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
1018                 if (ret < 0) {
1019                         rdev_err(rdev, "failed to set initial mode: %d\n", ret);
1020                         goto out;
1021                 }
1022         }
1023
1024         /* If the constraints say the regulator should be on at this point
1025          * and we have control then make sure it is enabled.
1026          */
1027         if (rdev->constraints->always_on || rdev->constraints->boot_on) {
1028                 ret = _regulator_do_enable(rdev);
1029                 if (ret < 0 && ret != -EINVAL) {
1030                         rdev_err(rdev, "failed to enable\n");
1031                         goto out;
1032                 }
1033         }
1034
1035         if ((rdev->constraints->ramp_delay || rdev->constraints->ramp_disable)
1036                 && ops->set_ramp_delay) {
1037                 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
1038                 if (ret < 0) {
1039                         rdev_err(rdev, "failed to set ramp_delay\n");
1040                         goto out;
1041                 }
1042         }
1043
1044         print_constraints(rdev);
1045         return 0;
1046 out:
1047         kfree(rdev->constraints);
1048         rdev->constraints = NULL;
1049         return ret;
1050 }
1051
1052 /**
1053  * set_supply - set regulator supply regulator
1054  * @rdev: regulator name
1055  * @supply_rdev: supply regulator name
1056  *
1057  * Called by platform initialisation code to set the supply regulator for this
1058  * regulator. This ensures that a regulators supply will also be enabled by the
1059  * core if it's child is enabled.
1060  */
1061 static int set_supply(struct regulator_dev *rdev,
1062                       struct regulator_dev *supply_rdev)
1063 {
1064         int err;
1065
1066         rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
1067
1068         rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
1069         if (rdev->supply == NULL) {
1070                 err = -ENOMEM;
1071                 return err;
1072         }
1073         supply_rdev->open_count++;
1074
1075         return 0;
1076 }
1077
1078 /**
1079  * set_consumer_device_supply - Bind a regulator to a symbolic supply
1080  * @rdev:         regulator source
1081  * @consumer_dev_name: dev_name() string for device supply applies to
1082  * @supply:       symbolic name for supply
1083  *
1084  * Allows platform initialisation code to map physical regulator
1085  * sources to symbolic names for supplies for use by devices.  Devices
1086  * should use these symbolic names to request regulators, avoiding the
1087  * need to provide board-specific regulator names as platform data.
1088  */
1089 static int set_consumer_device_supply(struct regulator_dev *rdev,
1090                                       const char *consumer_dev_name,
1091                                       const char *supply)
1092 {
1093         struct regulator_map *node;
1094         int has_dev;
1095
1096         if (supply == NULL)
1097                 return -EINVAL;
1098
1099         if (consumer_dev_name != NULL)
1100                 has_dev = 1;
1101         else
1102                 has_dev = 0;
1103
1104         list_for_each_entry(node, &regulator_map_list, list) {
1105                 if (node->dev_name && consumer_dev_name) {
1106                         if (strcmp(node->dev_name, consumer_dev_name) != 0)
1107                                 continue;
1108                 } else if (node->dev_name || consumer_dev_name) {
1109                         continue;
1110                 }
1111
1112                 if (strcmp(node->supply, supply) != 0)
1113                         continue;
1114
1115                 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1116                          consumer_dev_name,
1117                          dev_name(&node->regulator->dev),
1118                          node->regulator->desc->name,
1119                          supply,
1120                          dev_name(&rdev->dev), rdev_get_name(rdev));
1121                 return -EBUSY;
1122         }
1123
1124         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
1125         if (node == NULL)
1126                 return -ENOMEM;
1127
1128         node->regulator = rdev;
1129         node->supply = supply;
1130
1131         if (has_dev) {
1132                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1133                 if (node->dev_name == NULL) {
1134                         kfree(node);
1135                         return -ENOMEM;
1136                 }
1137         }
1138
1139         list_add(&node->list, &regulator_map_list);
1140         return 0;
1141 }
1142
1143 static void unset_regulator_supplies(struct regulator_dev *rdev)
1144 {
1145         struct regulator_map *node, *n;
1146
1147         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1148                 if (rdev == node->regulator) {
1149                         list_del(&node->list);
1150                         kfree(node->dev_name);
1151                         kfree(node);
1152                 }
1153         }
1154 }
1155
1156 #define REG_STR_SIZE    64
1157
1158 static struct regulator *create_regulator(struct regulator_dev *rdev,
1159                                           struct device *dev,
1160                                           const char *supply_name)
1161 {
1162         struct regulator *regulator;
1163         char buf[REG_STR_SIZE];
1164         int err, size;
1165
1166         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1167         if (regulator == NULL)
1168                 return NULL;
1169
1170         mutex_lock(&rdev->mutex);
1171         regulator->rdev = rdev;
1172         list_add(&regulator->list, &rdev->consumer_list);
1173
1174         if (dev) {
1175                 regulator->dev = dev;
1176
1177                 /* Add a link to the device sysfs entry */
1178                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1179                                  dev->kobj.name, supply_name);
1180                 if (size >= REG_STR_SIZE)
1181                         goto overflow_err;
1182
1183                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1184                 if (regulator->supply_name == NULL)
1185                         goto overflow_err;
1186
1187                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1188                                         buf);
1189                 if (err) {
1190                         rdev_warn(rdev, "could not add device link %s err %d\n",
1191                                   dev->kobj.name, err);
1192                         /* non-fatal */
1193                 }
1194         } else {
1195                 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1196                 if (regulator->supply_name == NULL)
1197                         goto overflow_err;
1198         }
1199
1200         regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1201                                                 rdev->debugfs);
1202         if (!regulator->debugfs) {
1203                 rdev_warn(rdev, "Failed to create debugfs directory\n");
1204         } else {
1205                 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1206                                    &regulator->uA_load);
1207                 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1208                                    &regulator->min_uV);
1209                 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1210                                    &regulator->max_uV);
1211         }
1212
1213         /*
1214          * Check now if the regulator is an always on regulator - if
1215          * it is then we don't need to do nearly so much work for
1216          * enable/disable calls.
1217          */
1218         if (!_regulator_can_change_status(rdev) &&
1219             _regulator_is_enabled(rdev))
1220                 regulator->always_on = true;
1221
1222         mutex_unlock(&rdev->mutex);
1223         return regulator;
1224 overflow_err:
1225         list_del(&regulator->list);
1226         kfree(regulator);
1227         mutex_unlock(&rdev->mutex);
1228         return NULL;
1229 }
1230
1231 static int _regulator_get_enable_time(struct regulator_dev *rdev)
1232 {
1233         if (rdev->constraints && rdev->constraints->enable_time)
1234                 return rdev->constraints->enable_time;
1235         if (!rdev->desc->ops->enable_time)
1236                 return rdev->desc->enable_time;
1237         return rdev->desc->ops->enable_time(rdev);
1238 }
1239
1240 static struct regulator_supply_alias *regulator_find_supply_alias(
1241                 struct device *dev, const char *supply)
1242 {
1243         struct regulator_supply_alias *map;
1244
1245         list_for_each_entry(map, &regulator_supply_alias_list, list)
1246                 if (map->src_dev == dev && strcmp(map->src_supply, supply) == 0)
1247                         return map;
1248
1249         return NULL;
1250 }
1251
1252 static void regulator_supply_alias(struct device **dev, const char **supply)
1253 {
1254         struct regulator_supply_alias *map;
1255
1256         map = regulator_find_supply_alias(*dev, *supply);
1257         if (map) {
1258                 dev_dbg(*dev, "Mapping supply %s to %s,%s\n",
1259                                 *supply, map->alias_supply,
1260                                 dev_name(map->alias_dev));
1261                 *dev = map->alias_dev;
1262                 *supply = map->alias_supply;
1263         }
1264 }
1265
1266 static struct regulator_dev *regulator_dev_lookup(struct device *dev,
1267                                                   const char *supply,
1268                                                   int *ret)
1269 {
1270         struct regulator_dev *r;
1271         struct device_node *node;
1272         struct regulator_map *map;
1273         const char *devname = NULL;
1274
1275         regulator_supply_alias(&dev, &supply);
1276
1277         /* first do a dt based lookup */
1278         if (dev && dev->of_node) {
1279                 node = of_get_regulator(dev, supply);
1280                 if (node) {
1281                         list_for_each_entry(r, &regulator_list, list)
1282                                 if (r->dev.parent &&
1283                                         node == r->dev.of_node)
1284                                         return r;
1285                         *ret = -EPROBE_DEFER;
1286                         return NULL;
1287                 } else {
1288                         /*
1289                          * If we couldn't even get the node then it's
1290                          * not just that the device didn't register
1291                          * yet, there's no node and we'll never
1292                          * succeed.
1293                          */
1294                         *ret = -ENODEV;
1295                 }
1296         }
1297
1298         /* if not found, try doing it non-dt way */
1299         if (dev)
1300                 devname = dev_name(dev);
1301
1302         list_for_each_entry(r, &regulator_list, list)
1303                 if (strcmp(rdev_get_name(r), supply) == 0)
1304                         return r;
1305
1306         list_for_each_entry(map, &regulator_map_list, list) {
1307                 /* If the mapping has a device set up it must match */
1308                 if (map->dev_name &&
1309                     (!devname || strcmp(map->dev_name, devname)))
1310                         continue;
1311
1312                 if (strcmp(map->supply, supply) == 0)
1313                         return map->regulator;
1314         }
1315
1316
1317         return NULL;
1318 }
1319
1320 /* Internal regulator request function */
1321 static struct regulator *_regulator_get(struct device *dev, const char *id,
1322                                         bool exclusive, bool allow_dummy)
1323 {
1324         struct regulator_dev *rdev;
1325         struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
1326         const char *devname = NULL;
1327         int ret;
1328
1329         if (id == NULL) {
1330                 pr_err("get() with no identifier\n");
1331                 return ERR_PTR(-EINVAL);
1332         }
1333
1334         if (dev)
1335                 devname = dev_name(dev);
1336
1337         if (have_full_constraints())
1338                 ret = -ENODEV;
1339         else
1340                 ret = -EPROBE_DEFER;
1341
1342         mutex_lock(&regulator_list_mutex);
1343
1344         rdev = regulator_dev_lookup(dev, id, &ret);
1345         if (rdev)
1346                 goto found;
1347
1348         regulator = ERR_PTR(ret);
1349
1350         /*
1351          * If we have return value from dev_lookup fail, we do not expect to
1352          * succeed, so, quit with appropriate error value
1353          */
1354         if (ret && ret != -ENODEV)
1355                 goto out;
1356
1357         if (!devname)
1358                 devname = "deviceless";
1359
1360         /*
1361          * Assume that a regulator is physically present and enabled
1362          * even if it isn't hooked up and just provide a dummy.
1363          */
1364         if (have_full_constraints() && allow_dummy) {
1365                 pr_warn("%s supply %s not found, using dummy regulator\n",
1366                         devname, id);
1367
1368                 rdev = dummy_regulator_rdev;
1369                 goto found;
1370         /* Don't log an error when called from regulator_get_optional() */
1371         } else if (!have_full_constraints() || exclusive) {
1372                 dev_warn(dev, "dummy supplies not allowed\n");
1373         }
1374
1375         mutex_unlock(&regulator_list_mutex);
1376         return regulator;
1377
1378 found:
1379         if (rdev->exclusive) {
1380                 regulator = ERR_PTR(-EPERM);
1381                 goto out;
1382         }
1383
1384         if (exclusive && rdev->open_count) {
1385                 regulator = ERR_PTR(-EBUSY);
1386                 goto out;
1387         }
1388
1389         if (!try_module_get(rdev->owner))
1390                 goto out;
1391
1392         regulator = create_regulator(rdev, dev, id);
1393         if (regulator == NULL) {
1394                 regulator = ERR_PTR(-ENOMEM);
1395                 module_put(rdev->owner);
1396                 goto out;
1397         }
1398
1399         rdev->open_count++;
1400         if (exclusive) {
1401                 rdev->exclusive = 1;
1402
1403                 ret = _regulator_is_enabled(rdev);
1404                 if (ret > 0)
1405                         rdev->use_count = 1;
1406                 else
1407                         rdev->use_count = 0;
1408         }
1409
1410 out:
1411         mutex_unlock(&regulator_list_mutex);
1412
1413         return regulator;
1414 }
1415
1416 /**
1417  * regulator_get - lookup and obtain a reference to a regulator.
1418  * @dev: device for regulator "consumer"
1419  * @id: Supply name or regulator ID.
1420  *
1421  * Returns a struct regulator corresponding to the regulator producer,
1422  * or IS_ERR() condition containing errno.
1423  *
1424  * Use of supply names configured via regulator_set_device_supply() is
1425  * strongly encouraged.  It is recommended that the supply name used
1426  * should match the name used for the supply and/or the relevant
1427  * device pins in the datasheet.
1428  */
1429 struct regulator *regulator_get(struct device *dev, const char *id)
1430 {
1431         return _regulator_get(dev, id, false, true);
1432 }
1433 EXPORT_SYMBOL_GPL(regulator_get);
1434
1435 /**
1436  * regulator_get_exclusive - obtain exclusive access to a regulator.
1437  * @dev: device for regulator "consumer"
1438  * @id: Supply name or regulator ID.
1439  *
1440  * Returns a struct regulator corresponding to the regulator producer,
1441  * or IS_ERR() condition containing errno.  Other consumers will be
1442  * unable to obtain this regulator while this reference is held and the
1443  * use count for the regulator will be initialised to reflect the current
1444  * state of the regulator.
1445  *
1446  * This is intended for use by consumers which cannot tolerate shared
1447  * use of the regulator such as those which need to force the
1448  * regulator off for correct operation of the hardware they are
1449  * controlling.
1450  *
1451  * Use of supply names configured via regulator_set_device_supply() is
1452  * strongly encouraged.  It is recommended that the supply name used
1453  * should match the name used for the supply and/or the relevant
1454  * device pins in the datasheet.
1455  */
1456 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1457 {
1458         return _regulator_get(dev, id, true, false);
1459 }
1460 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1461
1462 /**
1463  * regulator_get_optional - obtain optional access to a regulator.
1464  * @dev: device for regulator "consumer"
1465  * @id: Supply name or regulator ID.
1466  *
1467  * Returns a struct regulator corresponding to the regulator producer,
1468  * or IS_ERR() condition containing errno.
1469  *
1470  * This is intended for use by consumers for devices which can have
1471  * some supplies unconnected in normal use, such as some MMC devices.
1472  * It can allow the regulator core to provide stub supplies for other
1473  * supplies requested using normal regulator_get() calls without
1474  * disrupting the operation of drivers that can handle absent
1475  * supplies.
1476  *
1477  * Use of supply names configured via regulator_set_device_supply() is
1478  * strongly encouraged.  It is recommended that the supply name used
1479  * should match the name used for the supply and/or the relevant
1480  * device pins in the datasheet.
1481  */
1482 struct regulator *regulator_get_optional(struct device *dev, const char *id)
1483 {
1484         return _regulator_get(dev, id, false, false);
1485 }
1486 EXPORT_SYMBOL_GPL(regulator_get_optional);
1487
1488 /* Locks held by regulator_put() */
1489 static void _regulator_put(struct regulator *regulator)
1490 {
1491         struct regulator_dev *rdev;
1492
1493         if (regulator == NULL || IS_ERR(regulator))
1494                 return;
1495
1496         rdev = regulator->rdev;
1497
1498         debugfs_remove_recursive(regulator->debugfs);
1499
1500         /* remove any sysfs entries */
1501         if (regulator->dev)
1502                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1503         kfree(regulator->supply_name);
1504         list_del(&regulator->list);
1505         kfree(regulator);
1506
1507         rdev->open_count--;
1508         rdev->exclusive = 0;
1509
1510         module_put(rdev->owner);
1511 }
1512
1513 /**
1514  * regulator_put - "free" the regulator source
1515  * @regulator: regulator source
1516  *
1517  * Note: drivers must ensure that all regulator_enable calls made on this
1518  * regulator source are balanced by regulator_disable calls prior to calling
1519  * this function.
1520  */
1521 void regulator_put(struct regulator *regulator)
1522 {
1523         mutex_lock(&regulator_list_mutex);
1524         _regulator_put(regulator);
1525         mutex_unlock(&regulator_list_mutex);
1526 }
1527 EXPORT_SYMBOL_GPL(regulator_put);
1528
1529 /**
1530  * regulator_register_supply_alias - Provide device alias for supply lookup
1531  *
1532  * @dev: device that will be given as the regulator "consumer"
1533  * @id: Supply name or regulator ID
1534  * @alias_dev: device that should be used to lookup the supply
1535  * @alias_id: Supply name or regulator ID that should be used to lookup the
1536  * supply
1537  *
1538  * All lookups for id on dev will instead be conducted for alias_id on
1539  * alias_dev.
1540  */
1541 int regulator_register_supply_alias(struct device *dev, const char *id,
1542                                     struct device *alias_dev,
1543                                     const char *alias_id)
1544 {
1545         struct regulator_supply_alias *map;
1546
1547         map = regulator_find_supply_alias(dev, id);
1548         if (map)
1549                 return -EEXIST;
1550
1551         map = kzalloc(sizeof(struct regulator_supply_alias), GFP_KERNEL);
1552         if (!map)
1553                 return -ENOMEM;
1554
1555         map->src_dev = dev;
1556         map->src_supply = id;
1557         map->alias_dev = alias_dev;
1558         map->alias_supply = alias_id;
1559
1560         list_add(&map->list, &regulator_supply_alias_list);
1561
1562         pr_info("Adding alias for supply %s,%s -> %s,%s\n",
1563                 id, dev_name(dev), alias_id, dev_name(alias_dev));
1564
1565         return 0;
1566 }
1567 EXPORT_SYMBOL_GPL(regulator_register_supply_alias);
1568
1569 /**
1570  * regulator_unregister_supply_alias - Remove device alias
1571  *
1572  * @dev: device that will be given as the regulator "consumer"
1573  * @id: Supply name or regulator ID
1574  *
1575  * Remove a lookup alias if one exists for id on dev.
1576  */
1577 void regulator_unregister_supply_alias(struct device *dev, const char *id)
1578 {
1579         struct regulator_supply_alias *map;
1580
1581         map = regulator_find_supply_alias(dev, id);
1582         if (map) {
1583                 list_del(&map->list);
1584                 kfree(map);
1585         }
1586 }
1587 EXPORT_SYMBOL_GPL(regulator_unregister_supply_alias);
1588
1589 /**
1590  * regulator_bulk_register_supply_alias - register multiple aliases
1591  *
1592  * @dev: device that will be given as the regulator "consumer"
1593  * @id: List of supply names or regulator IDs
1594  * @alias_dev: device that should be used to lookup the supply
1595  * @alias_id: List of supply names or regulator IDs that should be used to
1596  * lookup the supply
1597  * @num_id: Number of aliases to register
1598  *
1599  * @return 0 on success, an errno on failure.
1600  *
1601  * This helper function allows drivers to register several supply
1602  * aliases in one operation.  If any of the aliases cannot be
1603  * registered any aliases that were registered will be removed
1604  * before returning to the caller.
1605  */
1606 int regulator_bulk_register_supply_alias(struct device *dev,
1607                                          const char *const *id,
1608                                          struct device *alias_dev,
1609                                          const char *const *alias_id,
1610                                          int num_id)
1611 {
1612         int i;
1613         int ret;
1614
1615         for (i = 0; i < num_id; ++i) {
1616                 ret = regulator_register_supply_alias(dev, id[i], alias_dev,
1617                                                       alias_id[i]);
1618                 if (ret < 0)
1619                         goto err;
1620         }
1621
1622         return 0;
1623
1624 err:
1625         dev_err(dev,
1626                 "Failed to create supply alias %s,%s -> %s,%s\n",
1627                 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
1628
1629         while (--i >= 0)
1630                 regulator_unregister_supply_alias(dev, id[i]);
1631
1632         return ret;
1633 }
1634 EXPORT_SYMBOL_GPL(regulator_bulk_register_supply_alias);
1635
1636 /**
1637  * regulator_bulk_unregister_supply_alias - unregister multiple aliases
1638  *
1639  * @dev: device that will be given as the regulator "consumer"
1640  * @id: List of supply names or regulator IDs
1641  * @num_id: Number of aliases to unregister
1642  *
1643  * This helper function allows drivers to unregister several supply
1644  * aliases in one operation.
1645  */
1646 void regulator_bulk_unregister_supply_alias(struct device *dev,
1647                                             const char *const *id,
1648                                             int num_id)
1649 {
1650         int i;
1651
1652         for (i = 0; i < num_id; ++i)
1653                 regulator_unregister_supply_alias(dev, id[i]);
1654 }
1655 EXPORT_SYMBOL_GPL(regulator_bulk_unregister_supply_alias);
1656
1657
1658 /* Manage enable GPIO list. Same GPIO pin can be shared among regulators */
1659 static int regulator_ena_gpio_request(struct regulator_dev *rdev,
1660                                 const struct regulator_config *config)
1661 {
1662         struct regulator_enable_gpio *pin;
1663         int ret;
1664
1665         list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
1666                 if (pin->gpio == config->ena_gpio) {
1667                         rdev_dbg(rdev, "GPIO %d is already used\n",
1668                                 config->ena_gpio);
1669                         goto update_ena_gpio_to_rdev;
1670                 }
1671         }
1672
1673         ret = gpio_request_one(config->ena_gpio,
1674                                 GPIOF_DIR_OUT | config->ena_gpio_flags,
1675                                 rdev_get_name(rdev));
1676         if (ret)
1677                 return ret;
1678
1679         pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
1680         if (pin == NULL) {
1681                 gpio_free(config->ena_gpio);
1682                 return -ENOMEM;
1683         }
1684
1685         pin->gpio = config->ena_gpio;
1686         pin->ena_gpio_invert = config->ena_gpio_invert;
1687         list_add(&pin->list, &regulator_ena_gpio_list);
1688
1689 update_ena_gpio_to_rdev:
1690         pin->request_count++;
1691         rdev->ena_pin = pin;
1692         return 0;
1693 }
1694
1695 static void regulator_ena_gpio_free(struct regulator_dev *rdev)
1696 {
1697         struct regulator_enable_gpio *pin, *n;
1698
1699         if (!rdev->ena_pin)
1700                 return;
1701
1702         /* Free the GPIO only in case of no use */
1703         list_for_each_entry_safe(pin, n, &regulator_ena_gpio_list, list) {
1704                 if (pin->gpio == rdev->ena_pin->gpio) {
1705                         if (pin->request_count <= 1) {
1706                                 pin->request_count = 0;
1707                                 gpio_free(pin->gpio);
1708                                 list_del(&pin->list);
1709                                 kfree(pin);
1710                         } else {
1711                                 pin->request_count--;
1712                         }
1713                 }
1714         }
1715 }
1716
1717 /**
1718  * regulator_ena_gpio_ctrl - balance enable_count of each GPIO and actual GPIO pin control
1719  * @rdev: regulator_dev structure
1720  * @enable: enable GPIO at initial use?
1721  *
1722  * GPIO is enabled in case of initial use. (enable_count is 0)
1723  * GPIO is disabled when it is not shared any more. (enable_count <= 1)
1724  */
1725 static int regulator_ena_gpio_ctrl(struct regulator_dev *rdev, bool enable)
1726 {
1727         struct regulator_enable_gpio *pin = rdev->ena_pin;
1728
1729         if (!pin)
1730                 return -EINVAL;
1731
1732         if (enable) {
1733                 /* Enable GPIO at initial use */
1734                 if (pin->enable_count == 0)
1735                         gpio_set_value_cansleep(pin->gpio,
1736                                                 !pin->ena_gpio_invert);
1737
1738                 pin->enable_count++;
1739         } else {
1740                 if (pin->enable_count > 1) {
1741                         pin->enable_count--;
1742                         return 0;
1743                 }
1744
1745                 /* Disable GPIO if not used */
1746                 if (pin->enable_count <= 1) {
1747                         gpio_set_value_cansleep(pin->gpio,
1748                                                 pin->ena_gpio_invert);
1749                         pin->enable_count = 0;
1750                 }
1751         }
1752
1753         return 0;
1754 }
1755
1756 static int _regulator_do_enable(struct regulator_dev *rdev)
1757 {
1758         int ret, delay;
1759
1760         /* Query before enabling in case configuration dependent.  */
1761         ret = _regulator_get_enable_time(rdev);
1762         if (ret >= 0) {
1763                 delay = ret;
1764         } else {
1765                 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1766                 delay = 0;
1767         }
1768
1769         trace_regulator_enable(rdev_get_name(rdev));
1770
1771         if (rdev->ena_pin) {
1772                 ret = regulator_ena_gpio_ctrl(rdev, true);
1773                 if (ret < 0)
1774                         return ret;
1775                 rdev->ena_gpio_state = 1;
1776         } else if (rdev->desc->ops->enable) {
1777                 ret = rdev->desc->ops->enable(rdev);
1778                 if (ret < 0)
1779                         return ret;
1780         } else {
1781                 return -EINVAL;
1782         }
1783
1784         /* Allow the regulator to ramp; it would be useful to extend
1785          * this for bulk operations so that the regulators can ramp
1786          * together.  */
1787         trace_regulator_enable_delay(rdev_get_name(rdev));
1788
1789         /*
1790          * Delay for the requested amount of time as per the guidelines in:
1791          *
1792          *     Documentation/timers/timers-howto.txt
1793          *
1794          * The assumption here is that regulators will never be enabled in
1795          * atomic context and therefore sleeping functions can be used.
1796          */
1797         if (delay) {
1798                 unsigned int ms = delay / 1000;
1799                 unsigned int us = delay % 1000;
1800
1801                 if (ms > 0) {
1802                         /*
1803                          * For small enough values, handle super-millisecond
1804                          * delays in the usleep_range() call below.
1805                          */
1806                         if (ms < 20)
1807                                 us += ms * 1000;
1808                         else
1809                                 msleep(ms);
1810                 }
1811
1812                 /*
1813                  * Give the scheduler some room to coalesce with any other
1814                  * wakeup sources. For delays shorter than 10 us, don't even
1815                  * bother setting up high-resolution timers and just busy-
1816                  * loop.
1817                  */
1818                 if (us >= 10)
1819                         usleep_range(us, us + 100);
1820                 else
1821                         udelay(us);
1822         }
1823
1824         trace_regulator_enable_complete(rdev_get_name(rdev));
1825
1826         return 0;
1827 }
1828
1829 /* locks held by regulator_enable() */
1830 static int _regulator_enable(struct regulator_dev *rdev)
1831 {
1832         int ret;
1833
1834         /* check voltage and requested load before enabling */
1835         if (rdev->constraints &&
1836             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1837                 drms_uA_update(rdev);
1838
1839         if (rdev->use_count == 0) {
1840                 /* The regulator may on if it's not switchable or left on */
1841                 ret = _regulator_is_enabled(rdev);
1842                 if (ret == -EINVAL || ret == 0) {
1843                         if (!_regulator_can_change_status(rdev))
1844                                 return -EPERM;
1845
1846                         ret = _regulator_do_enable(rdev);
1847                         if (ret < 0)
1848                                 return ret;
1849
1850                 } else if (ret < 0) {
1851                         rdev_err(rdev, "is_enabled() failed: %d\n", ret);
1852                         return ret;
1853                 }
1854                 /* Fallthrough on positive return values - already enabled */
1855         }
1856
1857         rdev->use_count++;
1858
1859         return 0;
1860 }
1861
1862 /**
1863  * regulator_enable - enable regulator output
1864  * @regulator: regulator source
1865  *
1866  * Request that the regulator be enabled with the regulator output at
1867  * the predefined voltage or current value.  Calls to regulator_enable()
1868  * must be balanced with calls to regulator_disable().
1869  *
1870  * NOTE: the output value can be set by other drivers, boot loader or may be
1871  * hardwired in the regulator.
1872  */
1873 int regulator_enable(struct regulator *regulator)
1874 {
1875         struct regulator_dev *rdev = regulator->rdev;
1876         int ret = 0;
1877
1878         if (regulator->always_on)
1879                 return 0;
1880
1881         if (rdev->supply) {
1882                 ret = regulator_enable(rdev->supply);
1883                 if (ret != 0)
1884                         return ret;
1885         }
1886
1887         mutex_lock(&rdev->mutex);
1888         ret = _regulator_enable(rdev);
1889         mutex_unlock(&rdev->mutex);
1890
1891         if (ret != 0 && rdev->supply)
1892                 regulator_disable(rdev->supply);
1893
1894         return ret;
1895 }
1896 EXPORT_SYMBOL_GPL(regulator_enable);
1897
1898 static int _regulator_do_disable(struct regulator_dev *rdev)
1899 {
1900         int ret;
1901
1902         trace_regulator_disable(rdev_get_name(rdev));
1903
1904         if (rdev->ena_pin) {
1905                 ret = regulator_ena_gpio_ctrl(rdev, false);
1906                 if (ret < 0)
1907                         return ret;
1908                 rdev->ena_gpio_state = 0;
1909
1910         } else if (rdev->desc->ops->disable) {
1911                 ret = rdev->desc->ops->disable(rdev);
1912                 if (ret != 0)
1913                         return ret;
1914         }
1915
1916         trace_regulator_disable_complete(rdev_get_name(rdev));
1917
1918         return 0;
1919 }
1920
1921 /* locks held by regulator_disable() */
1922 static int _regulator_disable(struct regulator_dev *rdev)
1923 {
1924         int ret = 0;
1925
1926         if (WARN(rdev->use_count <= 0,
1927                  "unbalanced disables for %s\n", rdev_get_name(rdev)))
1928                 return -EIO;
1929
1930         /* are we the last user and permitted to disable ? */
1931         if (rdev->use_count == 1 &&
1932             (rdev->constraints && !rdev->constraints->always_on)) {
1933
1934                 /* we are last user */
1935                 if (_regulator_can_change_status(rdev)) {
1936                         ret = _regulator_do_disable(rdev);
1937                         if (ret < 0) {
1938                                 rdev_err(rdev, "failed to disable\n");
1939                                 return ret;
1940                         }
1941                         _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1942                                         NULL);
1943                 }
1944
1945                 rdev->use_count = 0;
1946         } else if (rdev->use_count > 1) {
1947
1948                 if (rdev->constraints &&
1949                         (rdev->constraints->valid_ops_mask &
1950                         REGULATOR_CHANGE_DRMS))
1951                         drms_uA_update(rdev);
1952
1953                 rdev->use_count--;
1954         }
1955
1956         return ret;
1957 }
1958
1959 /**
1960  * regulator_disable - disable regulator output
1961  * @regulator: regulator source
1962  *
1963  * Disable the regulator output voltage or current.  Calls to
1964  * regulator_enable() must be balanced with calls to
1965  * regulator_disable().
1966  *
1967  * NOTE: this will only disable the regulator output if no other consumer
1968  * devices have it enabled, the regulator device supports disabling and
1969  * machine constraints permit this operation.
1970  */
1971 int regulator_disable(struct regulator *regulator)
1972 {
1973         struct regulator_dev *rdev = regulator->rdev;
1974         int ret = 0;
1975
1976         if (regulator->always_on)
1977                 return 0;
1978
1979         mutex_lock(&rdev->mutex);
1980         ret = _regulator_disable(rdev);
1981         mutex_unlock(&rdev->mutex);
1982
1983         if (ret == 0 && rdev->supply)
1984                 regulator_disable(rdev->supply);
1985
1986         return ret;
1987 }
1988 EXPORT_SYMBOL_GPL(regulator_disable);
1989
1990 /* locks held by regulator_force_disable() */
1991 static int _regulator_force_disable(struct regulator_dev *rdev)
1992 {
1993         int ret = 0;
1994
1995         ret = _regulator_do_disable(rdev);
1996         if (ret < 0) {
1997                 rdev_err(rdev, "failed to force disable\n");
1998                 return ret;
1999         }
2000
2001         _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
2002                         REGULATOR_EVENT_DISABLE, NULL);
2003
2004         return 0;
2005 }
2006
2007 /**
2008  * regulator_force_disable - force disable regulator output
2009  * @regulator: regulator source
2010  *
2011  * Forcibly disable the regulator output voltage or current.
2012  * NOTE: this *will* disable the regulator output even if other consumer
2013  * devices have it enabled. This should be used for situations when device
2014  * damage will likely occur if the regulator is not disabled (e.g. over temp).
2015  */
2016 int regulator_force_disable(struct regulator *regulator)
2017 {
2018         struct regulator_dev *rdev = regulator->rdev;
2019         int ret;
2020
2021         mutex_lock(&rdev->mutex);
2022         regulator->uA_load = 0;
2023         ret = _regulator_force_disable(regulator->rdev);
2024         mutex_unlock(&rdev->mutex);
2025
2026         if (rdev->supply)
2027                 while (rdev->open_count--)
2028                         regulator_disable(rdev->supply);
2029
2030         return ret;
2031 }
2032 EXPORT_SYMBOL_GPL(regulator_force_disable);
2033
2034 static void regulator_disable_work(struct work_struct *work)
2035 {
2036         struct regulator_dev *rdev = container_of(work, struct regulator_dev,
2037                                                   disable_work.work);
2038         int count, i, ret;
2039
2040         mutex_lock(&rdev->mutex);
2041
2042         BUG_ON(!rdev->deferred_disables);
2043
2044         count = rdev->deferred_disables;
2045         rdev->deferred_disables = 0;
2046
2047         for (i = 0; i < count; i++) {
2048                 ret = _regulator_disable(rdev);
2049                 if (ret != 0)
2050                         rdev_err(rdev, "Deferred disable failed: %d\n", ret);
2051         }
2052
2053         mutex_unlock(&rdev->mutex);
2054
2055         if (rdev->supply) {
2056                 for (i = 0; i < count; i++) {
2057                         ret = regulator_disable(rdev->supply);
2058                         if (ret != 0) {
2059                                 rdev_err(rdev,
2060                                          "Supply disable failed: %d\n", ret);
2061                         }
2062                 }
2063         }
2064 }
2065
2066 /**
2067  * regulator_disable_deferred - disable regulator output with delay
2068  * @regulator: regulator source
2069  * @ms: miliseconds until the regulator is disabled
2070  *
2071  * Execute regulator_disable() on the regulator after a delay.  This
2072  * is intended for use with devices that require some time to quiesce.
2073  *
2074  * NOTE: this will only disable the regulator output if no other consumer
2075  * devices have it enabled, the regulator device supports disabling and
2076  * machine constraints permit this operation.
2077  */
2078 int regulator_disable_deferred(struct regulator *regulator, int ms)
2079 {
2080         struct regulator_dev *rdev = regulator->rdev;
2081         int ret;
2082
2083         if (regulator->always_on)
2084                 return 0;
2085
2086         if (!ms)
2087                 return regulator_disable(regulator);
2088
2089         mutex_lock(&rdev->mutex);
2090         rdev->deferred_disables++;
2091         mutex_unlock(&rdev->mutex);
2092
2093         ret = queue_delayed_work(system_power_efficient_wq,
2094                                  &rdev->disable_work,
2095                                  msecs_to_jiffies(ms));
2096         if (ret < 0)
2097                 return ret;
2098         else
2099                 return 0;
2100 }
2101 EXPORT_SYMBOL_GPL(regulator_disable_deferred);
2102
2103 static int _regulator_is_enabled(struct regulator_dev *rdev)
2104 {
2105         /* A GPIO control always takes precedence */
2106         if (rdev->ena_pin)
2107                 return rdev->ena_gpio_state;
2108
2109         /* If we don't know then assume that the regulator is always on */
2110         if (!rdev->desc->ops->is_enabled)
2111                 return 1;
2112
2113         return rdev->desc->ops->is_enabled(rdev);
2114 }
2115
2116 /**
2117  * regulator_is_enabled - is the regulator output enabled
2118  * @regulator: regulator source
2119  *
2120  * Returns positive if the regulator driver backing the source/client
2121  * has requested that the device be enabled, zero if it hasn't, else a
2122  * negative errno code.
2123  *
2124  * Note that the device backing this regulator handle can have multiple
2125  * users, so it might be enabled even if regulator_enable() was never
2126  * called for this particular source.
2127  */
2128 int regulator_is_enabled(struct regulator *regulator)
2129 {
2130         int ret;
2131
2132         if (regulator->always_on)
2133                 return 1;
2134
2135         mutex_lock(&regulator->rdev->mutex);
2136         ret = _regulator_is_enabled(regulator->rdev);
2137         mutex_unlock(&regulator->rdev->mutex);
2138
2139         return ret;
2140 }
2141 EXPORT_SYMBOL_GPL(regulator_is_enabled);
2142
2143 /**
2144  * regulator_can_change_voltage - check if regulator can change voltage
2145  * @regulator: regulator source
2146  *
2147  * Returns positive if the regulator driver backing the source/client
2148  * can change its voltage, false otherwise. Useful for detecting fixed
2149  * or dummy regulators and disabling voltage change logic in the client
2150  * driver.
2151  */
2152 int regulator_can_change_voltage(struct regulator *regulator)
2153 {
2154         struct regulator_dev    *rdev = regulator->rdev;
2155
2156         if (rdev->constraints &&
2157             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2158                 if (rdev->desc->n_voltages - rdev->desc->linear_min_sel > 1)
2159                         return 1;
2160
2161                 if (rdev->desc->continuous_voltage_range &&
2162                     rdev->constraints->min_uV && rdev->constraints->max_uV &&
2163                     rdev->constraints->min_uV != rdev->constraints->max_uV)
2164                         return 1;
2165         }
2166
2167         return 0;
2168 }
2169 EXPORT_SYMBOL_GPL(regulator_can_change_voltage);
2170
2171 /**
2172  * regulator_count_voltages - count regulator_list_voltage() selectors
2173  * @regulator: regulator source
2174  *
2175  * Returns number of selectors, or negative errno.  Selectors are
2176  * numbered starting at zero, and typically correspond to bitfields
2177  * in hardware registers.
2178  */
2179 int regulator_count_voltages(struct regulator *regulator)
2180 {
2181         struct regulator_dev    *rdev = regulator->rdev;
2182
2183         return rdev->desc->n_voltages ? : -EINVAL;
2184 }
2185 EXPORT_SYMBOL_GPL(regulator_count_voltages);
2186
2187 /**
2188  * regulator_list_voltage - enumerate supported voltages
2189  * @regulator: regulator source
2190  * @selector: identify voltage to list
2191  * Context: can sleep
2192  *
2193  * Returns a voltage that can be passed to @regulator_set_voltage(),
2194  * zero if this selector code can't be used on this system, or a
2195  * negative errno.
2196  */
2197 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
2198 {
2199         struct regulator_dev    *rdev = regulator->rdev;
2200         struct regulator_ops    *ops = rdev->desc->ops;
2201         int                     ret;
2202
2203         if (rdev->desc->fixed_uV && rdev->desc->n_voltages == 1 && !selector)
2204                 return rdev->desc->fixed_uV;
2205
2206         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
2207                 return -EINVAL;
2208
2209         mutex_lock(&rdev->mutex);
2210         ret = ops->list_voltage(rdev, selector);
2211         mutex_unlock(&rdev->mutex);
2212
2213         if (ret > 0) {
2214                 if (ret < rdev->constraints->min_uV)
2215                         ret = 0;
2216                 else if (ret > rdev->constraints->max_uV)
2217                         ret = 0;
2218         }
2219
2220         return ret;
2221 }
2222 EXPORT_SYMBOL_GPL(regulator_list_voltage);
2223
2224 /**
2225  * regulator_get_linear_step - return the voltage step size between VSEL values
2226  * @regulator: regulator source
2227  *
2228  * Returns the voltage step size between VSEL values for linear
2229  * regulators, or return 0 if the regulator isn't a linear regulator.
2230  */
2231 unsigned int regulator_get_linear_step(struct regulator *regulator)
2232 {
2233         struct regulator_dev *rdev = regulator->rdev;
2234
2235         return rdev->desc->uV_step;
2236 }
2237 EXPORT_SYMBOL_GPL(regulator_get_linear_step);
2238
2239 /**
2240  * regulator_is_supported_voltage - check if a voltage range can be supported
2241  *
2242  * @regulator: Regulator to check.
2243  * @min_uV: Minimum required voltage in uV.
2244  * @max_uV: Maximum required voltage in uV.
2245  *
2246  * Returns a boolean or a negative error code.
2247  */
2248 int regulator_is_supported_voltage(struct regulator *regulator,
2249                                    int min_uV, int max_uV)
2250 {
2251         struct regulator_dev *rdev = regulator->rdev;
2252         int i, voltages, ret;
2253
2254         /* If we can't change voltage check the current voltage */
2255         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2256                 ret = regulator_get_voltage(regulator);
2257                 if (ret >= 0)
2258                         return min_uV <= ret && ret <= max_uV;
2259                 else
2260                         return ret;
2261         }
2262
2263         /* Any voltage within constrains range is fine? */
2264         if (rdev->desc->continuous_voltage_range)
2265                 return min_uV >= rdev->constraints->min_uV &&
2266                                 max_uV <= rdev->constraints->max_uV;
2267
2268         ret = regulator_count_voltages(regulator);
2269         if (ret < 0)
2270                 return ret;
2271         voltages = ret;
2272
2273         for (i = 0; i < voltages; i++) {
2274                 ret = regulator_list_voltage(regulator, i);
2275
2276                 if (ret >= min_uV && ret <= max_uV)
2277                         return 1;
2278         }
2279
2280         return 0;
2281 }
2282 EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
2283
2284 static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2285                                      int min_uV, int max_uV)
2286 {
2287         int ret;
2288         int delay = 0;
2289         int best_val = 0;
2290         unsigned int selector;
2291         int old_selector = -1;
2292
2293         trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2294
2295         min_uV += rdev->constraints->uV_offset;
2296         max_uV += rdev->constraints->uV_offset;
2297
2298         /*
2299          * If we can't obtain the old selector there is not enough
2300          * info to call set_voltage_time_sel().
2301          */
2302         if (_regulator_is_enabled(rdev) &&
2303             rdev->desc->ops->set_voltage_time_sel &&
2304             rdev->desc->ops->get_voltage_sel) {
2305                 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2306                 if (old_selector < 0)
2307                         return old_selector;
2308         }
2309
2310         if (rdev->desc->ops->set_voltage) {
2311                 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2312                                                    &selector);
2313
2314                 if (ret >= 0) {
2315                         if (rdev->desc->ops->list_voltage)
2316                                 best_val = rdev->desc->ops->list_voltage(rdev,
2317                                                                          selector);
2318                         else
2319                                 best_val = _regulator_get_voltage(rdev);
2320                 }
2321
2322         } else if (rdev->desc->ops->set_voltage_sel) {
2323                 if (rdev->desc->ops->map_voltage) {
2324                         ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2325                                                            max_uV);
2326                 } else {
2327                         if (rdev->desc->ops->list_voltage ==
2328                             regulator_list_voltage_linear)
2329                                 ret = regulator_map_voltage_linear(rdev,
2330                                                                 min_uV, max_uV);
2331                         else if (rdev->desc->ops->list_voltage ==
2332                                  regulator_list_voltage_linear_range)
2333                                 ret = regulator_map_voltage_linear_range(rdev,
2334                                                                 min_uV, max_uV);
2335                         else
2336                                 ret = regulator_map_voltage_iterate(rdev,
2337                                                                 min_uV, max_uV);
2338                 }
2339
2340                 if (ret >= 0) {
2341                         best_val = rdev->desc->ops->list_voltage(rdev, ret);
2342                         if (min_uV <= best_val && max_uV >= best_val) {
2343                                 selector = ret;
2344                                 if (old_selector == selector)
2345                                         ret = 0;
2346                                 else
2347                                         ret = rdev->desc->ops->set_voltage_sel(
2348                                                                 rdev, ret);
2349                         } else {
2350                                 ret = -EINVAL;
2351                         }
2352                 }
2353         } else {
2354                 ret = -EINVAL;
2355         }
2356
2357         /* Call set_voltage_time_sel if successfully obtained old_selector */
2358         if (ret == 0 && !rdev->constraints->ramp_disable && old_selector >= 0
2359                 && old_selector != selector) {
2360
2361                 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2362                                                 old_selector, selector);
2363                 if (delay < 0) {
2364                         rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2365                                   delay);
2366                         delay = 0;
2367                 }
2368
2369                 /* Insert any necessary delays */
2370                 if (delay >= 1000) {
2371                         mdelay(delay / 1000);
2372                         udelay(delay % 1000);
2373                 } else if (delay) {
2374                         udelay(delay);
2375                 }
2376         }
2377
2378         if (ret == 0 && best_val >= 0) {
2379                 unsigned long data = best_val;
2380
2381                 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2382                                      (void *)data);
2383         }
2384
2385         trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
2386
2387         return ret;
2388 }
2389
2390 /**
2391  * regulator_set_voltage - set regulator output voltage
2392  * @regulator: regulator source
2393  * @min_uV: Minimum required voltage in uV
2394  * @max_uV: Maximum acceptable voltage in uV
2395  *
2396  * Sets a voltage regulator to the desired output voltage. This can be set
2397  * during any regulator state. IOW, regulator can be disabled or enabled.
2398  *
2399  * If the regulator is enabled then the voltage will change to the new value
2400  * immediately otherwise if the regulator is disabled the regulator will
2401  * output at the new voltage when enabled.
2402  *
2403  * NOTE: If the regulator is shared between several devices then the lowest
2404  * request voltage that meets the system constraints will be used.
2405  * Regulator system constraints must be set for this regulator before
2406  * calling this function otherwise this call will fail.
2407  */
2408 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2409 {
2410         struct regulator_dev *rdev = regulator->rdev;
2411         int ret = 0;
2412         int old_min_uV, old_max_uV;
2413         int current_uV;
2414
2415         mutex_lock(&rdev->mutex);
2416
2417         /* If we're setting the same range as last time the change
2418          * should be a noop (some cpufreq implementations use the same
2419          * voltage for multiple frequencies, for example).
2420          */
2421         if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2422                 goto out;
2423
2424         /* If we're trying to set a range that overlaps the current voltage,
2425          * return succesfully even though the regulator does not support
2426          * changing the voltage.
2427          */
2428         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
2429                 current_uV = _regulator_get_voltage(rdev);
2430                 if (min_uV <= current_uV && current_uV <= max_uV) {
2431                         regulator->min_uV = min_uV;
2432                         regulator->max_uV = max_uV;
2433                         goto out;
2434                 }
2435         }
2436
2437         /* sanity check */
2438         if (!rdev->desc->ops->set_voltage &&
2439             !rdev->desc->ops->set_voltage_sel) {
2440                 ret = -EINVAL;
2441                 goto out;
2442         }
2443
2444         /* constraints check */
2445         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2446         if (ret < 0)
2447                 goto out;
2448
2449         /* restore original values in case of error */
2450         old_min_uV = regulator->min_uV;
2451         old_max_uV = regulator->max_uV;
2452         regulator->min_uV = min_uV;
2453         regulator->max_uV = max_uV;
2454
2455         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2456         if (ret < 0)
2457                 goto out2;
2458
2459         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2460         if (ret < 0)
2461                 goto out2;
2462
2463 out:
2464         mutex_unlock(&rdev->mutex);
2465         return ret;
2466 out2:
2467         regulator->min_uV = old_min_uV;
2468         regulator->max_uV = old_max_uV;
2469         mutex_unlock(&rdev->mutex);
2470         return ret;
2471 }
2472 EXPORT_SYMBOL_GPL(regulator_set_voltage);
2473
2474 /**
2475  * regulator_set_voltage_time - get raise/fall time
2476  * @regulator: regulator source
2477  * @old_uV: starting voltage in microvolts
2478  * @new_uV: target voltage in microvolts
2479  *
2480  * Provided with the starting and ending voltage, this function attempts to
2481  * calculate the time in microseconds required to rise or fall to this new
2482  * voltage.
2483  */
2484 int regulator_set_voltage_time(struct regulator *regulator,
2485                                int old_uV, int new_uV)
2486 {
2487         struct regulator_dev    *rdev = regulator->rdev;
2488         struct regulator_ops    *ops = rdev->desc->ops;
2489         int old_sel = -1;
2490         int new_sel = -1;
2491         int voltage;
2492         int i;
2493
2494         /* Currently requires operations to do this */
2495         if (!ops->list_voltage || !ops->set_voltage_time_sel
2496             || !rdev->desc->n_voltages)
2497                 return -EINVAL;
2498
2499         for (i = 0; i < rdev->desc->n_voltages; i++) {
2500                 /* We only look for exact voltage matches here */
2501                 voltage = regulator_list_voltage(regulator, i);
2502                 if (voltage < 0)
2503                         return -EINVAL;
2504                 if (voltage == 0)
2505                         continue;
2506                 if (voltage == old_uV)
2507                         old_sel = i;
2508                 if (voltage == new_uV)
2509                         new_sel = i;
2510         }
2511
2512         if (old_sel < 0 || new_sel < 0)
2513                 return -EINVAL;
2514
2515         return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2516 }
2517 EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2518
2519 /**
2520  * regulator_set_voltage_time_sel - get raise/fall time
2521  * @rdev: regulator source device
2522  * @old_selector: selector for starting voltage
2523  * @new_selector: selector for target voltage
2524  *
2525  * Provided with the starting and target voltage selectors, this function
2526  * returns time in microseconds required to rise or fall to this new voltage
2527  *
2528  * Drivers providing ramp_delay in regulation_constraints can use this as their
2529  * set_voltage_time_sel() operation.
2530  */
2531 int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2532                                    unsigned int old_selector,
2533                                    unsigned int new_selector)
2534 {
2535         unsigned int ramp_delay = 0;
2536         int old_volt, new_volt;
2537
2538         if (rdev->constraints->ramp_delay)
2539                 ramp_delay = rdev->constraints->ramp_delay;
2540         else if (rdev->desc->ramp_delay)
2541                 ramp_delay = rdev->desc->ramp_delay;
2542
2543         if (ramp_delay == 0) {
2544                 rdev_warn(rdev, "ramp_delay not set\n");
2545                 return 0;
2546         }
2547
2548         /* sanity check */
2549         if (!rdev->desc->ops->list_voltage)
2550                 return -EINVAL;
2551
2552         old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2553         new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2554
2555         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
2556 }
2557 EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
2558
2559 /**
2560  * regulator_sync_voltage - re-apply last regulator output voltage
2561  * @regulator: regulator source
2562  *
2563  * Re-apply the last configured voltage.  This is intended to be used
2564  * where some external control source the consumer is cooperating with
2565  * has caused the configured voltage to change.
2566  */
2567 int regulator_sync_voltage(struct regulator *regulator)
2568 {
2569         struct regulator_dev *rdev = regulator->rdev;
2570         int ret, min_uV, max_uV;
2571
2572         mutex_lock(&rdev->mutex);
2573
2574         if (!rdev->desc->ops->set_voltage &&
2575             !rdev->desc->ops->set_voltage_sel) {
2576                 ret = -EINVAL;
2577                 goto out;
2578         }
2579
2580         /* This is only going to work if we've had a voltage configured. */
2581         if (!regulator->min_uV && !regulator->max_uV) {
2582                 ret = -EINVAL;
2583                 goto out;
2584         }
2585
2586         min_uV = regulator->min_uV;
2587         max_uV = regulator->max_uV;
2588
2589         /* This should be a paranoia check... */
2590         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2591         if (ret < 0)
2592                 goto out;
2593
2594         ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2595         if (ret < 0)
2596                 goto out;
2597
2598         ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2599
2600 out:
2601         mutex_unlock(&rdev->mutex);
2602         return ret;
2603 }
2604 EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2605
2606 static int _regulator_get_voltage(struct regulator_dev *rdev)
2607 {
2608         int sel, ret;
2609
2610         if (rdev->desc->ops->get_voltage_sel) {
2611                 sel = rdev->desc->ops->get_voltage_sel(rdev);
2612                 if (sel < 0)
2613                         return sel;
2614                 ret = rdev->desc->ops->list_voltage(rdev, sel);
2615         } else if (rdev->desc->ops->get_voltage) {
2616                 ret = rdev->desc->ops->get_voltage(rdev);
2617         } else if (rdev->desc->ops->list_voltage) {
2618                 ret = rdev->desc->ops->list_voltage(rdev, 0);
2619         } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) {
2620                 ret = rdev->desc->fixed_uV;
2621         } else {
2622                 return -EINVAL;
2623         }
2624
2625         if (ret < 0)
2626                 return ret;
2627         return ret - rdev->constraints->uV_offset;
2628 }
2629
2630 /**
2631  * regulator_get_voltage - get regulator output voltage
2632  * @regulator: regulator source
2633  *
2634  * This returns the current regulator voltage in uV.
2635  *
2636  * NOTE: If the regulator is disabled it will return the voltage value. This
2637  * function should not be used to determine regulator state.
2638  */
2639 int regulator_get_voltage(struct regulator *regulator)
2640 {
2641         int ret;
2642
2643         mutex_lock(&regulator->rdev->mutex);
2644
2645         ret = _regulator_get_voltage(regulator->rdev);
2646
2647         mutex_unlock(&regulator->rdev->mutex);
2648
2649         return ret;
2650 }
2651 EXPORT_SYMBOL_GPL(regulator_get_voltage);
2652
2653 /**
2654  * regulator_set_current_limit - set regulator output current limit
2655  * @regulator: regulator source
2656  * @min_uA: Minimum supported current in uA
2657  * @max_uA: Maximum supported current in uA
2658  *
2659  * Sets current sink to the desired output current. This can be set during
2660  * any regulator state. IOW, regulator can be disabled or enabled.
2661  *
2662  * If the regulator is enabled then the current will change to the new value
2663  * immediately otherwise if the regulator is disabled the regulator will
2664  * output at the new current when enabled.
2665  *
2666  * NOTE: Regulator system constraints must be set for this regulator before
2667  * calling this function otherwise this call will fail.
2668  */
2669 int regulator_set_current_limit(struct regulator *regulator,
2670                                int min_uA, int max_uA)
2671 {
2672         struct regulator_dev *rdev = regulator->rdev;
2673         int ret;
2674
2675         mutex_lock(&rdev->mutex);
2676
2677         /* sanity check */
2678         if (!rdev->desc->ops->set_current_limit) {
2679                 ret = -EINVAL;
2680                 goto out;
2681         }
2682
2683         /* constraints check */
2684         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2685         if (ret < 0)
2686                 goto out;
2687
2688         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2689 out:
2690         mutex_unlock(&rdev->mutex);
2691         return ret;
2692 }
2693 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2694
2695 static int _regulator_get_current_limit(struct regulator_dev *rdev)
2696 {
2697         int ret;
2698
2699         mutex_lock(&rdev->mutex);
2700
2701         /* sanity check */
2702         if (!rdev->desc->ops->get_current_limit) {
2703                 ret = -EINVAL;
2704                 goto out;
2705         }
2706
2707         ret = rdev->desc->ops->get_current_limit(rdev);
2708 out:
2709         mutex_unlock(&rdev->mutex);
2710         return ret;
2711 }
2712
2713 /**
2714  * regulator_get_current_limit - get regulator output current
2715  * @regulator: regulator source
2716  *
2717  * This returns the current supplied by the specified current sink in uA.
2718  *
2719  * NOTE: If the regulator is disabled it will return the current value. This
2720  * function should not be used to determine regulator state.
2721  */
2722 int regulator_get_current_limit(struct regulator *regulator)
2723 {
2724         return _regulator_get_current_limit(regulator->rdev);
2725 }
2726 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2727
2728 /**
2729  * regulator_set_mode - set regulator operating mode
2730  * @regulator: regulator source
2731  * @mode: operating mode - one of the REGULATOR_MODE constants
2732  *
2733  * Set regulator operating mode to increase regulator efficiency or improve
2734  * regulation performance.
2735  *
2736  * NOTE: Regulator system constraints must be set for this regulator before
2737  * calling this function otherwise this call will fail.
2738  */
2739 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2740 {
2741         struct regulator_dev *rdev = regulator->rdev;
2742         int ret;
2743         int regulator_curr_mode;
2744
2745         mutex_lock(&rdev->mutex);
2746
2747         /* sanity check */
2748         if (!rdev->desc->ops->set_mode) {
2749                 ret = -EINVAL;
2750                 goto out;
2751         }
2752
2753         /* return if the same mode is requested */
2754         if (rdev->desc->ops->get_mode) {
2755                 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2756                 if (regulator_curr_mode == mode) {
2757                         ret = 0;
2758                         goto out;
2759                 }
2760         }
2761
2762         /* constraints check */
2763         ret = regulator_mode_constrain(rdev, &mode);
2764         if (ret < 0)
2765                 goto out;
2766
2767         ret = rdev->desc->ops->set_mode(rdev, mode);
2768 out:
2769         mutex_unlock(&rdev->mutex);
2770         return ret;
2771 }
2772 EXPORT_SYMBOL_GPL(regulator_set_mode);
2773
2774 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2775 {
2776         int ret;
2777
2778         mutex_lock(&rdev->mutex);
2779
2780         /* sanity check */
2781         if (!rdev->desc->ops->get_mode) {
2782                 ret = -EINVAL;
2783                 goto out;
2784         }
2785
2786         ret = rdev->desc->ops->get_mode(rdev);
2787 out:
2788         mutex_unlock(&rdev->mutex);
2789         return ret;
2790 }
2791
2792 /**
2793  * regulator_get_mode - get regulator operating mode
2794  * @regulator: regulator source
2795  *
2796  * Get the current regulator operating mode.
2797  */
2798 unsigned int regulator_get_mode(struct regulator *regulator)
2799 {
2800         return _regulator_get_mode(regulator->rdev);
2801 }
2802 EXPORT_SYMBOL_GPL(regulator_get_mode);
2803
2804 /**
2805  * regulator_set_optimum_mode - set regulator optimum operating mode
2806  * @regulator: regulator source
2807  * @uA_load: load current
2808  *
2809  * Notifies the regulator core of a new device load. This is then used by
2810  * DRMS (if enabled by constraints) to set the most efficient regulator
2811  * operating mode for the new regulator loading.
2812  *
2813  * Consumer devices notify their supply regulator of the maximum power
2814  * they will require (can be taken from device datasheet in the power
2815  * consumption tables) when they change operational status and hence power
2816  * state. Examples of operational state changes that can affect power
2817  * consumption are :-
2818  *
2819  *    o Device is opened / closed.
2820  *    o Device I/O is about to begin or has just finished.
2821  *    o Device is idling in between work.
2822  *
2823  * This information is also exported via sysfs to userspace.
2824  *
2825  * DRMS will sum the total requested load on the regulator and change
2826  * to the most efficient operating mode if platform constraints allow.
2827  *
2828  * Returns the new regulator mode or error.
2829  */
2830 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2831 {
2832         struct regulator_dev *rdev = regulator->rdev;
2833         struct regulator *consumer;
2834         int ret, output_uV, input_uV = 0, total_uA_load = 0;
2835         unsigned int mode;
2836
2837         if (rdev->supply)
2838                 input_uV = regulator_get_voltage(rdev->supply);
2839
2840         mutex_lock(&rdev->mutex);
2841
2842         /*
2843          * first check to see if we can set modes at all, otherwise just
2844          * tell the consumer everything is OK.
2845          */
2846         regulator->uA_load = uA_load;
2847         ret = regulator_check_drms(rdev);
2848         if (ret < 0) {
2849                 ret = 0;
2850                 goto out;
2851         }
2852
2853         if (!rdev->desc->ops->get_optimum_mode)
2854                 goto out;
2855
2856         /*
2857          * we can actually do this so any errors are indicators of
2858          * potential real failure.
2859          */
2860         ret = -EINVAL;
2861
2862         if (!rdev->desc->ops->set_mode)
2863                 goto out;
2864
2865         /* get output voltage */
2866         output_uV = _regulator_get_voltage(rdev);
2867         if (output_uV <= 0) {
2868                 rdev_err(rdev, "invalid output voltage found\n");
2869                 goto out;
2870         }
2871
2872         /* No supply? Use constraint voltage */
2873         if (input_uV <= 0)
2874                 input_uV = rdev->constraints->input_uV;
2875         if (input_uV <= 0) {
2876                 rdev_err(rdev, "invalid input voltage found\n");
2877                 goto out;
2878         }
2879
2880         /* calc total requested load for this regulator */
2881         list_for_each_entry(consumer, &rdev->consumer_list, list)
2882                 total_uA_load += consumer->uA_load;
2883
2884         mode = rdev->desc->ops->get_optimum_mode(rdev,
2885                                                  input_uV, output_uV,
2886                                                  total_uA_load);
2887         ret = regulator_mode_constrain(rdev, &mode);
2888         if (ret < 0) {
2889                 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2890                          total_uA_load, input_uV, output_uV);
2891                 goto out;
2892         }
2893
2894         ret = rdev->desc->ops->set_mode(rdev, mode);
2895         if (ret < 0) {
2896                 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
2897                 goto out;
2898         }
2899         ret = mode;
2900 out:
2901         mutex_unlock(&rdev->mutex);
2902         return ret;
2903 }
2904 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2905
2906 /**
2907  * regulator_allow_bypass - allow the regulator to go into bypass mode
2908  *
2909  * @regulator: Regulator to configure
2910  * @enable: enable or disable bypass mode
2911  *
2912  * Allow the regulator to go into bypass mode if all other consumers
2913  * for the regulator also enable bypass mode and the machine
2914  * constraints allow this.  Bypass mode means that the regulator is
2915  * simply passing the input directly to the output with no regulation.
2916  */
2917 int regulator_allow_bypass(struct regulator *regulator, bool enable)
2918 {
2919         struct regulator_dev *rdev = regulator->rdev;
2920         int ret = 0;
2921
2922         if (!rdev->desc->ops->set_bypass)
2923                 return 0;
2924
2925         if (rdev->constraints &&
2926             !(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_BYPASS))
2927                 return 0;
2928
2929         mutex_lock(&rdev->mutex);
2930
2931         if (enable && !regulator->bypass) {
2932                 rdev->bypass_count++;
2933
2934                 if (rdev->bypass_count == rdev->open_count) {
2935                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2936                         if (ret != 0)
2937                                 rdev->bypass_count--;
2938                 }
2939
2940         } else if (!enable && regulator->bypass) {
2941                 rdev->bypass_count--;
2942
2943                 if (rdev->bypass_count != rdev->open_count) {
2944                         ret = rdev->desc->ops->set_bypass(rdev, enable);
2945                         if (ret != 0)
2946                                 rdev->bypass_count++;
2947                 }
2948         }
2949
2950         if (ret == 0)
2951                 regulator->bypass = enable;
2952
2953         mutex_unlock(&rdev->mutex);
2954
2955         return ret;
2956 }
2957 EXPORT_SYMBOL_GPL(regulator_allow_bypass);
2958
2959 /**
2960  * regulator_register_notifier - register regulator event notifier
2961  * @regulator: regulator source
2962  * @nb: notifier block
2963  *
2964  * Register notifier block to receive regulator events.
2965  */
2966 int regulator_register_notifier(struct regulator *regulator,
2967                               struct notifier_block *nb)
2968 {
2969         return blocking_notifier_chain_register(&regulator->rdev->notifier,
2970                                                 nb);
2971 }
2972 EXPORT_SYMBOL_GPL(regulator_register_notifier);
2973
2974 /**
2975  * regulator_unregister_notifier - unregister regulator event notifier
2976  * @regulator: regulator source
2977  * @nb: notifier block
2978  *
2979  * Unregister regulator event notifier block.
2980  */
2981 int regulator_unregister_notifier(struct regulator *regulator,
2982                                 struct notifier_block *nb)
2983 {
2984         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2985                                                   nb);
2986 }
2987 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2988
2989 /* notify regulator consumers and downstream regulator consumers.
2990  * Note mutex must be held by caller.
2991  */
2992 static void _notifier_call_chain(struct regulator_dev *rdev,
2993                                   unsigned long event, void *data)
2994 {
2995         /* call rdev chain first */
2996         blocking_notifier_call_chain(&rdev->notifier, event, data);
2997 }
2998
2999 /**
3000  * regulator_bulk_get - get multiple regulator consumers
3001  *
3002  * @dev:           Device to supply
3003  * @num_consumers: Number of consumers to register
3004  * @consumers:     Configuration of consumers; clients are stored here.
3005  *
3006  * @return 0 on success, an errno on failure.
3007  *
3008  * This helper function allows drivers to get several regulator
3009  * consumers in one operation.  If any of the regulators cannot be
3010  * acquired then any regulators that were allocated will be freed
3011  * before returning to the caller.
3012  */
3013 int regulator_bulk_get(struct device *dev, int num_consumers,
3014                        struct regulator_bulk_data *consumers)
3015 {
3016         int i;
3017         int ret;
3018
3019         for (i = 0; i < num_consumers; i++)
3020                 consumers[i].consumer = NULL;
3021
3022         for (i = 0; i < num_consumers; i++) {
3023                 consumers[i].consumer = regulator_get(dev,
3024                                                       consumers[i].supply);
3025                 if (IS_ERR(consumers[i].consumer)) {
3026                         ret = PTR_ERR(consumers[i].consumer);
3027                         dev_err(dev, "Failed to get supply '%s': %d\n",
3028                                 consumers[i].supply, ret);
3029                         consumers[i].consumer = NULL;
3030                         goto err;
3031                 }
3032         }
3033
3034         return 0;
3035
3036 err:
3037         while (--i >= 0)
3038                 regulator_put(consumers[i].consumer);
3039
3040         return ret;
3041 }
3042 EXPORT_SYMBOL_GPL(regulator_bulk_get);
3043
3044 static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
3045 {
3046         struct regulator_bulk_data *bulk = data;
3047
3048         bulk->ret = regulator_enable(bulk->consumer);
3049 }
3050
3051 /**
3052  * regulator_bulk_enable - enable multiple regulator consumers
3053  *
3054  * @num_consumers: Number of consumers
3055  * @consumers:     Consumer data; clients are stored here.
3056  * @return         0 on success, an errno on failure
3057  *
3058  * This convenience API allows consumers to enable multiple regulator
3059  * clients in a single API call.  If any consumers cannot be enabled
3060  * then any others that were enabled will be disabled again prior to
3061  * return.
3062  */
3063 int regulator_bulk_enable(int num_consumers,
3064                           struct regulator_bulk_data *consumers)
3065 {
3066         ASYNC_DOMAIN_EXCLUSIVE(async_domain);
3067         int i;
3068         int ret = 0;
3069
3070         for (i = 0; i < num_consumers; i++) {
3071                 if (consumers[i].consumer->always_on)
3072                         consumers[i].ret = 0;
3073                 else
3074                         async_schedule_domain(regulator_bulk_enable_async,
3075                                               &consumers[i], &async_domain);
3076         }
3077
3078         async_synchronize_full_domain(&async_domain);
3079
3080         /* If any consumer failed we need to unwind any that succeeded */
3081         for (i = 0; i < num_consumers; i++) {
3082                 if (consumers[i].ret != 0) {
3083                         ret = consumers[i].ret;
3084                         goto err;
3085                 }
3086         }
3087
3088         return 0;
3089
3090 err:
3091         for (i = 0; i < num_consumers; i++) {
3092                 if (consumers[i].ret < 0)
3093                         pr_err("Failed to enable %s: %d\n", consumers[i].supply,
3094                                consumers[i].ret);
3095                 else
3096                         regulator_disable(consumers[i].consumer);
3097         }
3098
3099         return ret;
3100 }
3101 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
3102
3103 /**
3104  * regulator_bulk_disable - disable multiple regulator consumers
3105  *
3106  * @num_consumers: Number of consumers
3107  * @consumers:     Consumer data; clients are stored here.
3108  * @return         0 on success, an errno on failure
3109  *
3110  * This convenience API allows consumers to disable multiple regulator
3111  * clients in a single API call.  If any consumers cannot be disabled
3112  * then any others that were disabled will be enabled again prior to
3113  * return.
3114  */
3115 int regulator_bulk_disable(int num_consumers,
3116                            struct regulator_bulk_data *consumers)
3117 {
3118         int i;
3119         int ret, r;
3120
3121         for (i = num_consumers - 1; i >= 0; --i) {
3122                 ret = regulator_disable(consumers[i].consumer);
3123                 if (ret != 0)
3124                         goto err;
3125         }
3126
3127         return 0;
3128
3129 err:
3130         pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
3131         for (++i; i < num_consumers; ++i) {
3132                 r = regulator_enable(consumers[i].consumer);
3133                 if (r != 0)
3134                         pr_err("Failed to reename %s: %d\n",
3135                                consumers[i].supply, r);
3136         }
3137
3138         return ret;
3139 }
3140 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
3141
3142 /**
3143  * regulator_bulk_force_disable - force disable multiple regulator consumers
3144  *
3145  * @num_consumers: Number of consumers
3146  * @consumers:     Consumer data; clients are stored here.
3147  * @return         0 on success, an errno on failure
3148  *
3149  * This convenience API allows consumers to forcibly disable multiple regulator
3150  * clients in a single API call.
3151  * NOTE: This should be used for situations when device damage will
3152  * likely occur if the regulators are not disabled (e.g. over temp).
3153  * Although regulator_force_disable function call for some consumers can
3154  * return error numbers, the function is called for all consumers.
3155  */
3156 int regulator_bulk_force_disable(int num_consumers,
3157                            struct regulator_bulk_data *consumers)
3158 {
3159         int i;
3160         int ret;
3161
3162         for (i = 0; i < num_consumers; i++)
3163                 consumers[i].ret =
3164                             regulator_force_disable(consumers[i].consumer);
3165
3166         for (i = 0; i < num_consumers; i++) {
3167                 if (consumers[i].ret != 0) {
3168                         ret = consumers[i].ret;
3169                         goto out;
3170                 }
3171         }
3172
3173         return 0;
3174 out:
3175         return ret;
3176 }
3177 EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
3178
3179 /**
3180  * regulator_bulk_free - free multiple regulator consumers
3181  *
3182  * @num_consumers: Number of consumers
3183  * @consumers:     Consumer data; clients are stored here.
3184  *
3185  * This convenience API allows consumers to free multiple regulator
3186  * clients in a single API call.
3187  */
3188 void regulator_bulk_free(int num_consumers,
3189                          struct regulator_bulk_data *consumers)
3190 {
3191         int i;
3192
3193         for (i = 0; i < num_consumers; i++) {
3194                 regulator_put(consumers[i].consumer);
3195                 consumers[i].consumer = NULL;
3196         }
3197 }
3198 EXPORT_SYMBOL_GPL(regulator_bulk_free);
3199
3200 /**
3201  * regulator_notifier_call_chain - call regulator event notifier
3202  * @rdev: regulator source
3203  * @event: notifier block
3204  * @data: callback-specific data.
3205  *
3206  * Called by regulator drivers to notify clients a regulator event has
3207  * occurred. We also notify regulator clients downstream.
3208  * Note lock must be held by caller.
3209  */
3210 int regulator_notifier_call_chain(struct regulator_dev *rdev,
3211                                   unsigned long event, void *data)
3212 {
3213         _notifier_call_chain(rdev, event, data);
3214         return NOTIFY_DONE;
3215
3216 }
3217 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
3218
3219 /**
3220  * regulator_mode_to_status - convert a regulator mode into a status
3221  *
3222  * @mode: Mode to convert
3223  *
3224  * Convert a regulator mode into a status.
3225  */
3226 int regulator_mode_to_status(unsigned int mode)
3227 {
3228         switch (mode) {
3229         case REGULATOR_MODE_FAST:
3230                 return REGULATOR_STATUS_FAST;
3231         case REGULATOR_MODE_NORMAL:
3232                 return REGULATOR_STATUS_NORMAL;
3233         case REGULATOR_MODE_IDLE:
3234                 return REGULATOR_STATUS_IDLE;
3235         case REGULATOR_MODE_STANDBY:
3236                 return REGULATOR_STATUS_STANDBY;
3237         default:
3238                 return REGULATOR_STATUS_UNDEFINED;
3239         }
3240 }
3241 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3242
3243 /*
3244  * To avoid cluttering sysfs (and memory) with useless state, only
3245  * create attributes that can be meaningfully displayed.
3246  */
3247 static int add_regulator_attributes(struct regulator_dev *rdev)
3248 {
3249         struct device           *dev = &rdev->dev;
3250         struct regulator_ops    *ops = rdev->desc->ops;
3251         int                     status = 0;
3252
3253         /* some attributes need specific methods to be displayed */
3254         if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3255             (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) ||
3256             (ops->list_voltage && ops->list_voltage(rdev, 0) >= 0) ||
3257                 (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1))) {
3258                 status = device_create_file(dev, &dev_attr_microvolts);
3259                 if (status < 0)
3260                         return status;
3261         }
3262         if (ops->get_current_limit) {
3263                 status = device_create_file(dev, &dev_attr_microamps);
3264                 if (status < 0)
3265                         return status;
3266         }
3267         if (ops->get_mode) {
3268                 status = device_create_file(dev, &dev_attr_opmode);
3269                 if (status < 0)
3270                         return status;
3271         }
3272         if (rdev->ena_pin || ops->is_enabled) {
3273                 status = device_create_file(dev, &dev_attr_state);
3274                 if (status < 0)
3275                         return status;
3276         }
3277         if (ops->get_status) {
3278                 status = device_create_file(dev, &dev_attr_status);
3279                 if (status < 0)
3280                         return status;
3281         }
3282         if (ops->get_bypass) {
3283                 status = device_create_file(dev, &dev_attr_bypass);
3284                 if (status < 0)
3285                         return status;
3286         }
3287
3288         /* some attributes are type-specific */
3289         if (rdev->desc->type == REGULATOR_CURRENT) {
3290                 status = device_create_file(dev, &dev_attr_requested_microamps);
3291                 if (status < 0)
3292                         return status;
3293         }
3294
3295         /* all the other attributes exist to support constraints;
3296          * don't show them if there are no constraints, or if the
3297          * relevant supporting methods are missing.
3298          */
3299         if (!rdev->constraints)
3300                 return status;
3301
3302         /* constraints need specific supporting methods */
3303         if (ops->set_voltage || ops->set_voltage_sel) {
3304                 status = device_create_file(dev, &dev_attr_min_microvolts);
3305                 if (status < 0)
3306                         return status;
3307                 status = device_create_file(dev, &dev_attr_max_microvolts);
3308                 if (status < 0)
3309                         return status;
3310         }
3311         if (ops->set_current_limit) {
3312                 status = device_create_file(dev, &dev_attr_min_microamps);
3313                 if (status < 0)
3314                         return status;
3315                 status = device_create_file(dev, &dev_attr_max_microamps);
3316                 if (status < 0)
3317                         return status;
3318         }
3319
3320         status = device_create_file(dev, &dev_attr_suspend_standby_state);
3321         if (status < 0)
3322                 return status;
3323         status = device_create_file(dev, &dev_attr_suspend_mem_state);
3324         if (status < 0)
3325                 return status;
3326         status = device_create_file(dev, &dev_attr_suspend_disk_state);
3327         if (status < 0)
3328                 return status;
3329
3330         if (ops->set_suspend_voltage) {
3331                 status = device_create_file(dev,
3332                                 &dev_attr_suspend_standby_microvolts);
3333                 if (status < 0)
3334                         return status;
3335                 status = device_create_file(dev,
3336                                 &dev_attr_suspend_mem_microvolts);
3337                 if (status < 0)
3338                         return status;
3339                 status = device_create_file(dev,
3340                                 &dev_attr_suspend_disk_microvolts);
3341                 if (status < 0)
3342                         return status;
3343         }
3344
3345         if (ops->set_suspend_mode) {
3346                 status = device_create_file(dev,
3347                                 &dev_attr_suspend_standby_mode);
3348                 if (status < 0)
3349                         return status;
3350                 status = device_create_file(dev,
3351                                 &dev_attr_suspend_mem_mode);
3352                 if (status < 0)
3353                         return status;
3354                 status = device_create_file(dev,
3355                                 &dev_attr_suspend_disk_mode);
3356                 if (status < 0)
3357                         return status;
3358         }
3359
3360         return status;
3361 }
3362
3363 static void rdev_init_debugfs(struct regulator_dev *rdev)
3364 {
3365         rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
3366         if (!rdev->debugfs) {
3367                 rdev_warn(rdev, "Failed to create debugfs directory\n");
3368                 return;
3369         }
3370
3371         debugfs_create_u32("use_count", 0444, rdev->debugfs,
3372                            &rdev->use_count);
3373         debugfs_create_u32("open_count", 0444, rdev->debugfs,
3374                            &rdev->open_count);
3375         debugfs_create_u32("bypass_count", 0444, rdev->debugfs,
3376                            &rdev->bypass_count);
3377 }
3378
3379 /**
3380  * regulator_register - register regulator
3381  * @regulator_desc: regulator to register
3382  * @config: runtime configuration for regulator
3383  *
3384  * Called by regulator drivers to register a regulator.
3385  * Returns a valid pointer to struct regulator_dev on success
3386  * or an ERR_PTR() on error.
3387  */
3388 struct regulator_dev *
3389 regulator_register(const struct regulator_desc *regulator_desc,
3390                    const struct regulator_config *config)
3391 {
3392         const struct regulation_constraints *constraints = NULL;
3393         const struct regulator_init_data *init_data;
3394         static atomic_t regulator_no = ATOMIC_INIT(0);
3395         struct regulator_dev *rdev;
3396         struct device *dev;
3397         int ret, i;
3398         const char *supply = NULL;
3399
3400         if (regulator_desc == NULL || config == NULL)
3401                 return ERR_PTR(-EINVAL);
3402
3403         dev = config->dev;
3404         WARN_ON(!dev);
3405
3406         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3407                 return ERR_PTR(-EINVAL);
3408
3409         if (regulator_desc->type != REGULATOR_VOLTAGE &&
3410             regulator_desc->type != REGULATOR_CURRENT)
3411                 return ERR_PTR(-EINVAL);
3412
3413         /* Only one of each should be implemented */
3414         WARN_ON(regulator_desc->ops->get_voltage &&
3415                 regulator_desc->ops->get_voltage_sel);
3416         WARN_ON(regulator_desc->ops->set_voltage &&
3417                 regulator_desc->ops->set_voltage_sel);
3418
3419         /* If we're using selectors we must implement list_voltage. */
3420         if (regulator_desc->ops->get_voltage_sel &&
3421             !regulator_desc->ops->list_voltage) {
3422                 return ERR_PTR(-EINVAL);
3423         }
3424         if (regulator_desc->ops->set_voltage_sel &&
3425             !regulator_desc->ops->list_voltage) {
3426                 return ERR_PTR(-EINVAL);
3427         }
3428
3429         init_data = config->init_data;
3430
3431         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3432         if (rdev == NULL)
3433                 return ERR_PTR(-ENOMEM);
3434
3435         mutex_lock(&regulator_list_mutex);
3436
3437         mutex_init(&rdev->mutex);
3438         rdev->reg_data = config->driver_data;
3439         rdev->owner = regulator_desc->owner;
3440         rdev->desc = regulator_desc;
3441         if (config->regmap)
3442                 rdev->regmap = config->regmap;
3443         else if (dev_get_regmap(dev, NULL))
3444                 rdev->regmap = dev_get_regmap(dev, NULL);
3445         else if (dev->parent)
3446                 rdev->regmap = dev_get_regmap(dev->parent, NULL);
3447         INIT_LIST_HEAD(&rdev->consumer_list);
3448         INIT_LIST_HEAD(&rdev->list);
3449         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
3450         INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
3451
3452         /* preform any regulator specific init */
3453         if (init_data && init_data->regulator_init) {
3454                 ret = init_data->regulator_init(rdev->reg_data);
3455                 if (ret < 0)
3456                         goto clean;
3457         }
3458
3459         /* register with sysfs */
3460         rdev->dev.class = &regulator_class;
3461         rdev->dev.of_node = of_node_get(config->of_node);
3462         rdev->dev.parent = dev;
3463         dev_set_name(&rdev->dev, "regulator.%d",
3464                      atomic_inc_return(&regulator_no) - 1);
3465         ret = device_register(&rdev->dev);
3466         if (ret != 0) {
3467                 put_device(&rdev->dev);
3468                 goto clean;
3469         }
3470
3471         dev_set_drvdata(&rdev->dev, rdev);
3472
3473         if (config->ena_gpio && gpio_is_valid(config->ena_gpio)) {
3474                 ret = regulator_ena_gpio_request(rdev, config);
3475                 if (ret != 0) {
3476                         rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3477                                  config->ena_gpio, ret);
3478                         goto wash;
3479                 }
3480
3481                 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3482                         rdev->ena_gpio_state = 1;
3483
3484                 if (config->ena_gpio_invert)
3485                         rdev->ena_gpio_state = !rdev->ena_gpio_state;
3486         }
3487
3488         /* set regulator constraints */
3489         if (init_data)
3490                 constraints = &init_data->constraints;
3491
3492         ret = set_machine_constraints(rdev, constraints);
3493         if (ret < 0)
3494                 goto scrub;
3495
3496         /* add attributes supported by this regulator */
3497         ret = add_regulator_attributes(rdev);
3498         if (ret < 0)
3499                 goto scrub;
3500
3501         if (init_data && init_data->supply_regulator)
3502                 supply = init_data->supply_regulator;
3503         else if (regulator_desc->supply_name)
3504                 supply = regulator_desc->supply_name;
3505
3506         if (supply) {
3507                 struct regulator_dev *r;
3508
3509                 r = regulator_dev_lookup(dev, supply, &ret);
3510
3511                 if (ret == -ENODEV) {
3512                         /*
3513                          * No supply was specified for this regulator and
3514                          * there will never be one.
3515                          */
3516                         ret = 0;
3517                         goto add_dev;
3518                 } else if (!r) {
3519                         dev_err(dev, "Failed to find supply %s\n", supply);
3520                         ret = -EPROBE_DEFER;
3521                         goto scrub;
3522                 }
3523
3524                 ret = set_supply(rdev, r);
3525                 if (ret < 0)
3526                         goto scrub;
3527
3528                 /* Enable supply if rail is enabled */
3529                 if (_regulator_is_enabled(rdev)) {
3530                         ret = regulator_enable(rdev->supply);
3531                         if (ret < 0)
3532                                 goto scrub;
3533                 }
3534         }
3535
3536 add_dev:
3537         /* add consumers devices */
3538         if (init_data) {
3539                 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3540                         ret = set_consumer_device_supply(rdev,
3541                                 init_data->consumer_supplies[i].dev_name,
3542                                 init_data->consumer_supplies[i].supply);
3543                         if (ret < 0) {
3544                                 dev_err(dev, "Failed to set supply %s\n",
3545                                         init_data->consumer_supplies[i].supply);
3546                                 goto unset_supplies;
3547                         }
3548                 }
3549         }
3550
3551         list_add(&rdev->list, &regulator_list);
3552
3553         rdev_init_debugfs(rdev);
3554 out:
3555         mutex_unlock(&regulator_list_mutex);
3556         return rdev;
3557
3558 unset_supplies:
3559         unset_regulator_supplies(rdev);
3560
3561 scrub:
3562         if (rdev->supply)
3563                 _regulator_put(rdev->supply);
3564         regulator_ena_gpio_free(rdev);
3565         kfree(rdev->constraints);
3566 wash:
3567         device_unregister(&rdev->dev);
3568         /* device core frees rdev */
3569         rdev = ERR_PTR(ret);
3570         goto out;
3571
3572 clean:
3573         kfree(rdev);
3574         rdev = ERR_PTR(ret);
3575         goto out;
3576 }
3577 EXPORT_SYMBOL_GPL(regulator_register);
3578
3579 /**
3580  * regulator_unregister - unregister regulator
3581  * @rdev: regulator to unregister
3582  *
3583  * Called by regulator drivers to unregister a regulator.
3584  */
3585 void regulator_unregister(struct regulator_dev *rdev)
3586 {
3587         if (rdev == NULL)
3588                 return;
3589
3590         if (rdev->supply) {
3591                 while (rdev->use_count--)
3592                         regulator_disable(rdev->supply);
3593                 regulator_put(rdev->supply);
3594         }
3595         mutex_lock(&regulator_list_mutex);
3596         debugfs_remove_recursive(rdev->debugfs);
3597         flush_work(&rdev->disable_work.work);
3598         WARN_ON(rdev->open_count);
3599         unset_regulator_supplies(rdev);
3600         list_del(&rdev->list);
3601         kfree(rdev->constraints);
3602         regulator_ena_gpio_free(rdev);
3603         of_node_put(rdev->dev.of_node);
3604         device_unregister(&rdev->dev);
3605         mutex_unlock(&regulator_list_mutex);
3606 }
3607 EXPORT_SYMBOL_GPL(regulator_unregister);
3608
3609 /**
3610  * regulator_suspend_prepare - prepare regulators for system wide suspend
3611  * @state: system suspend state
3612  *
3613  * Configure each regulator with it's suspend operating parameters for state.
3614  * This will usually be called by machine suspend code prior to supending.
3615  */
3616 int regulator_suspend_prepare(suspend_state_t state)
3617 {
3618         struct regulator_dev *rdev;
3619         int ret = 0;
3620
3621         /* ON is handled by regulator active state */
3622         if (state == PM_SUSPEND_ON)
3623                 return -EINVAL;
3624
3625         mutex_lock(&regulator_list_mutex);
3626         list_for_each_entry(rdev, &regulator_list, list) {
3627
3628                 mutex_lock(&rdev->mutex);
3629                 ret = suspend_prepare(rdev, state);
3630                 mutex_unlock(&rdev->mutex);
3631
3632                 if (ret < 0) {
3633                         rdev_err(rdev, "failed to prepare\n");
3634                         goto out;
3635                 }
3636         }
3637 out:
3638         mutex_unlock(&regulator_list_mutex);
3639         return ret;
3640 }
3641 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3642
3643 /**
3644  * regulator_suspend_finish - resume regulators from system wide suspend
3645  *
3646  * Turn on regulators that might be turned off by regulator_suspend_prepare
3647  * and that should be turned on according to the regulators properties.
3648  */
3649 int regulator_suspend_finish(void)
3650 {
3651         struct regulator_dev *rdev;
3652         int ret = 0, error;
3653
3654         mutex_lock(&regulator_list_mutex);
3655         list_for_each_entry(rdev, &regulator_list, list) {
3656                 mutex_lock(&rdev->mutex);
3657                 if (rdev->use_count > 0  || rdev->constraints->always_on) {
3658                         error = _regulator_do_enable(rdev);
3659                         if (error)
3660                                 ret = error;
3661                 } else {
3662                         if (!have_full_constraints())
3663                                 goto unlock;
3664                         if (!_regulator_is_enabled(rdev))
3665                                 goto unlock;
3666
3667                         error = _regulator_do_disable(rdev);
3668                         if (error)
3669                                 ret = error;
3670                 }
3671 unlock:
3672                 mutex_unlock(&rdev->mutex);
3673         }
3674         mutex_unlock(&regulator_list_mutex);
3675         return ret;
3676 }
3677 EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3678
3679 /**
3680  * regulator_has_full_constraints - the system has fully specified constraints
3681  *
3682  * Calling this function will cause the regulator API to disable all
3683  * regulators which have a zero use count and don't have an always_on
3684  * constraint in a late_initcall.
3685  *
3686  * The intention is that this will become the default behaviour in a
3687  * future kernel release so users are encouraged to use this facility
3688  * now.
3689  */
3690 void regulator_has_full_constraints(void)
3691 {
3692         has_full_constraints = 1;
3693 }
3694 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3695
3696 /**
3697  * rdev_get_drvdata - get rdev regulator driver data
3698  * @rdev: regulator
3699  *
3700  * Get rdev regulator driver private data. This call can be used in the
3701  * regulator driver context.
3702  */
3703 void *rdev_get_drvdata(struct regulator_dev *rdev)
3704 {
3705         return rdev->reg_data;
3706 }
3707 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3708
3709 /**
3710  * regulator_get_drvdata - get regulator driver data
3711  * @regulator: regulator
3712  *
3713  * Get regulator driver private data. This call can be used in the consumer
3714  * driver context when non API regulator specific functions need to be called.
3715  */
3716 void *regulator_get_drvdata(struct regulator *regulator)
3717 {
3718         return regulator->rdev->reg_data;
3719 }
3720 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3721
3722 /**
3723  * regulator_set_drvdata - set regulator driver data
3724  * @regulator: regulator
3725  * @data: data
3726  */
3727 void regulator_set_drvdata(struct regulator *regulator, void *data)
3728 {
3729         regulator->rdev->reg_data = data;
3730 }
3731 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3732
3733 /**
3734  * regulator_get_id - get regulator ID
3735  * @rdev: regulator
3736  */
3737 int rdev_get_id(struct regulator_dev *rdev)
3738 {
3739         return rdev->desc->id;
3740 }
3741 EXPORT_SYMBOL_GPL(rdev_get_id);
3742
3743 struct device *rdev_get_dev(struct regulator_dev *rdev)
3744 {
3745         return &rdev->dev;
3746 }
3747 EXPORT_SYMBOL_GPL(rdev_get_dev);
3748
3749 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3750 {
3751         return reg_init_data->driver_data;
3752 }
3753 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3754
3755 #ifdef CONFIG_DEBUG_FS
3756 static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3757                                     size_t count, loff_t *ppos)
3758 {
3759         char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3760         ssize_t len, ret = 0;
3761         struct regulator_map *map;
3762
3763         if (!buf)
3764                 return -ENOMEM;
3765
3766         list_for_each_entry(map, &regulator_map_list, list) {
3767                 len = snprintf(buf + ret, PAGE_SIZE - ret,
3768                                "%s -> %s.%s\n",
3769                                rdev_get_name(map->regulator), map->dev_name,
3770                                map->supply);
3771                 if (len >= 0)
3772                         ret += len;
3773                 if (ret > PAGE_SIZE) {
3774                         ret = PAGE_SIZE;
3775                         break;
3776                 }
3777         }
3778
3779         ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3780
3781         kfree(buf);
3782
3783         return ret;
3784 }
3785 #endif
3786
3787 static const struct file_operations supply_map_fops = {
3788 #ifdef CONFIG_DEBUG_FS
3789         .read = supply_map_read_file,
3790         .llseek = default_llseek,
3791 #endif
3792 };
3793
3794 static int __init regulator_init(void)
3795 {
3796         int ret;
3797
3798         ret = class_register(&regulator_class);
3799
3800         debugfs_root = debugfs_create_dir("regulator", NULL);
3801         if (!debugfs_root)
3802                 pr_warn("regulator: Failed to create debugfs directory\n");
3803
3804         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3805                             &supply_map_fops);
3806
3807         regulator_dummy_init();
3808
3809         return ret;
3810 }
3811
3812 /* init early to allow our consumers to complete system booting */
3813 core_initcall(regulator_init);
3814
3815 static int __init regulator_init_complete(void)
3816 {
3817         struct regulator_dev *rdev;
3818         struct regulator_ops *ops;
3819         struct regulation_constraints *c;
3820         int enabled, ret;
3821
3822         /*
3823          * Since DT doesn't provide an idiomatic mechanism for
3824          * enabling full constraints and since it's much more natural
3825          * with DT to provide them just assume that a DT enabled
3826          * system has full constraints.
3827          */
3828         if (of_have_populated_dt())
3829                 has_full_constraints = true;
3830
3831         mutex_lock(&regulator_list_mutex);
3832
3833         /* If we have a full configuration then disable any regulators
3834          * we have permission to change the status for and which are
3835          * not in use or always_on.  This is effectively the default
3836          * for DT and ACPI as they have full constraints.
3837          */
3838         list_for_each_entry(rdev, &regulator_list, list) {
3839                 ops = rdev->desc->ops;
3840                 c = rdev->constraints;
3841
3842                 if (c && c->always_on)
3843                         continue;
3844
3845                 if (c && !(c->valid_ops_mask & REGULATOR_CHANGE_STATUS))
3846                         continue;
3847
3848                 mutex_lock(&rdev->mutex);
3849
3850                 if (rdev->use_count)
3851                         goto unlock;
3852
3853                 /* If we can't read the status assume it's on. */
3854                 if (ops->is_enabled)
3855                         enabled = ops->is_enabled(rdev);
3856                 else
3857                         enabled = 1;
3858
3859                 if (!enabled)
3860                         goto unlock;
3861
3862                 if (have_full_constraints()) {
3863                         /* We log since this may kill the system if it
3864                          * goes wrong. */
3865                         rdev_info(rdev, "disabling\n");
3866                         ret = _regulator_do_disable(rdev);
3867                         if (ret != 0)
3868                                 rdev_err(rdev, "couldn't disable: %d\n", ret);
3869                 } else {
3870                         /* The intention is that in future we will
3871                          * assume that full constraints are provided
3872                          * so warn even if we aren't going to do
3873                          * anything here.
3874                          */
3875                         rdev_warn(rdev, "incomplete constraints, leaving on\n");
3876                 }
3877
3878 unlock:
3879                 mutex_unlock(&rdev->mutex);
3880         }
3881
3882         mutex_unlock(&regulator_list_mutex);
3883
3884         return 0;
3885 }
3886 late_initcall_sync(regulator_init_complete);