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/device.h>
  19 #include <linux/err.h>
  20 #include <linux/mutex.h>
  21 #include <linux/suspend.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/regulator/driver.h>
  24 #include <linux/regulator/machine.h>
  25
  26 #define REGULATOR_VERSION "0.5"
  27
  28 static DEFINE_MUTEX(regulator_list_mutex);
  29 static LIST_HEAD(regulator_list);
  30 static LIST_HEAD(regulator_map_list);
  31
  32 /*
  33  * struct regulator_map
  34  *
  35  * Used to provide symbolic supply names to devices.
  36  */
  37 struct regulator_map {
  38         struct list_head list;
  39         struct device *dev;
  40         const char *supply;
  41         struct regulator_dev *regulator;
  42 };
  43
  44 /*
  45  * struct regulator
  46  *
  47  * One for each consumer device.
  48  */
  49 struct regulator {
  50         struct device *dev;
  51         struct list_head list;
  52         int uA_load;
  53         int min_uV;
  54         int max_uV;
  55         int enabled; /* count of client enables */
  56         char *supply_name;
  57         struct device_attribute dev_attr;
  58         struct regulator_dev *rdev;
  59 };
  60
  61 static int _regulator_is_enabled(struct regulator_dev *rdev);
  62 static int _regulator_disable(struct regulator_dev *rdev);
  63 static int _regulator_get_voltage(struct regulator_dev *rdev);
  64 static int _regulator_get_current_limit(struct regulator_dev *rdev);
  65 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
  66 static void _notifier_call_chain(struct regulator_dev *rdev,
  67                                   unsigned long event, void *data);
  68
  69 /* gets the regulator for a given consumer device */
  70 static struct regulator *get_device_regulator(struct device *dev)
  71 {
  72         struct regulator *regulator = NULL;
  73         struct regulator_dev *rdev;
  74
  75         mutex_lock(&regulator_list_mutex);
  76         list_for_each_entry(rdev, &regulator_list, list) {
  77                 mutex_lock(&rdev->mutex);
  78                 list_for_each_entry(regulator, &rdev->consumer_list, list) {
  79                         if (regulator->dev == dev) {
  80                                 mutex_unlock(&rdev->mutex);
  81                                 mutex_unlock(&regulator_list_mutex);
  82                                 return regulator;
  83                         }
  84                 }
  85                 mutex_unlock(&rdev->mutex);
  86         }
  87         mutex_unlock(&regulator_list_mutex);
  88         return NULL;
  89 }
  90
  91 /* Platform voltage constraint check */
  92 static int regulator_check_voltage(struct regulator_dev *rdev,
  93                                    int *min_uV, int *max_uV)
  94 {
  95         BUG_ON(*min_uV > *max_uV);
  96
  97         if (!rdev->constraints) {
  98                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
  99                        rdev->desc->name);
 100                 return -ENODEV;
 101         }
 102         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 103                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 104                        __func__, rdev->desc->name);
 105                 return -EPERM;
 106         }
 107
 108         if (*max_uV > rdev->constraints->max_uV)
 109                 *max_uV = rdev->constraints->max_uV;
 110         if (*min_uV < rdev->constraints->min_uV)
 111                 *min_uV = rdev->constraints->min_uV;
 112
 113         if (*min_uV > *max_uV)
 114                 return -EINVAL;
 115
 116         return 0;
 117 }
 118
 119 /* current constraint check */
 120 static int regulator_check_current_limit(struct regulator_dev *rdev,
 121                                         int *min_uA, int *max_uA)
 122 {
 123         BUG_ON(*min_uA > *max_uA);
 124
 125         if (!rdev->constraints) {
 126                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 127                        rdev->desc->name);
 128                 return -ENODEV;
 129         }
 130         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 131                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 132                        __func__, rdev->desc->name);
 133                 return -EPERM;
 134         }
 135
 136         if (*max_uA > rdev->constraints->max_uA)
 137                 *max_uA = rdev->constraints->max_uA;
 138         if (*min_uA < rdev->constraints->min_uA)
 139                 *min_uA = rdev->constraints->min_uA;
 140
 141         if (*min_uA > *max_uA)
 142                 return -EINVAL;
 143
 144         return 0;
 145 }
 146
 147 /* operating mode constraint check */
 148 static int regulator_check_mode(struct regulator_dev *rdev, int mode)
 149 {
 150         switch (mode) {
 151         case REGULATOR_MODE_FAST:
 152         case REGULATOR_MODE_NORMAL:
 153         case REGULATOR_MODE_IDLE:
 154         case REGULATOR_MODE_STANDBY:
 155                 break;
 156         default:
 157                 return -EINVAL;
 158         }
 159
 160         if (!rdev->constraints) {
 161                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 162                        rdev->desc->name);
 163                 return -ENODEV;
 164         }
 165         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 166                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 167                        __func__, rdev->desc->name);
 168                 return -EPERM;
 169         }
 170         if (!(rdev->constraints->valid_modes_mask & mode)) {
 171                 printk(KERN_ERR "%s: invalid mode %x for %s\n",
 172                        __func__, mode, rdev->desc->name);
 173                 return -EINVAL;
 174         }
 175         return 0;
 176 }
 177
 178 /* dynamic regulator mode switching constraint check */
 179 static int regulator_check_drms(struct regulator_dev *rdev)
 180 {
 181         if (!rdev->constraints) {
 182                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 183                        rdev->desc->name);
 184                 return -ENODEV;
 185         }
 186         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 187                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 188                        __func__, rdev->desc->name);
 189                 return -EPERM;
 190         }
 191         return 0;
 192 }
 193
 194 static ssize_t device_requested_uA_show(struct device *dev,
 195                              struct device_attribute *attr, char *buf)
 196 {
 197         struct regulator *regulator;
 198
 199         regulator = get_device_regulator(dev);
 200         if (regulator == NULL)
 201                 return 0;
 202
 203         return sprintf(buf, "%d\n", regulator->uA_load);
 204 }
 205
 206 static ssize_t regulator_uV_show(struct device *dev,
 207                                 struct device_attribute *attr, char *buf)
 208 {
 209         struct regulator_dev *rdev = dev_get_drvdata(dev);
 210         ssize_t ret;
 211
 212         mutex_lock(&rdev->mutex);
 213         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 214         mutex_unlock(&rdev->mutex);
 215
 216         return ret;
 217 }
 218 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 219
 220 static ssize_t regulator_uA_show(struct device *dev,
 221                                 struct device_attribute *attr, char *buf)
 222 {
 223         struct regulator_dev *rdev = dev_get_drvdata(dev);
 224
 225         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 226 }
 227 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 228
 229 static ssize_t regulator_name_show(struct device *dev,
 230                              struct device_attribute *attr, char *buf)
 231 {
 232         struct regulator_dev *rdev = dev_get_drvdata(dev);
 233         const char *name;
 234
 235         if (rdev->constraints->name)
 236                 name = rdev->constraints->name;
 237         else if (rdev->desc->name)
 238                 name = rdev->desc->name;
 239         else
 240                 name = "";
 241
 242         return sprintf(buf, "%s\n", name);
 243 }
 244
 245 static ssize_t regulator_print_opmode(char *buf, int mode)
 246 {
 247         switch (mode) {
 248         case REGULATOR_MODE_FAST:
 249                 return sprintf(buf, "fast\n");
 250         case REGULATOR_MODE_NORMAL:
 251                 return sprintf(buf, "normal\n");
 252         case REGULATOR_MODE_IDLE:
 253                 return sprintf(buf, "idle\n");
 254         case REGULATOR_MODE_STANDBY:
 255                 return sprintf(buf, "standby\n");
 256         }
 257         return sprintf(buf, "unknown\n");
 258 }
 259
 260 static ssize_t regulator_opmode_show(struct device *dev,
 261                                     struct device_attribute *attr, char *buf)
 262 {
 263         struct regulator_dev *rdev = dev_get_drvdata(dev);
 264
 265         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 266 }
 267 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 268
 269 static ssize_t regulator_print_state(char *buf, int state)
 270 {
 271         if (state > 0)
 272                 return sprintf(buf, "enabled\n");
 273         else if (state == 0)
 274                 return sprintf(buf, "disabled\n");
 275         else
 276                 return sprintf(buf, "unknown\n");
 277 }
 278
 279 static ssize_t regulator_state_show(struct device *dev,
 280                                    struct device_attribute *attr, char *buf)
 281 {
 282         struct regulator_dev *rdev = dev_get_drvdata(dev);
 283
 284         return regulator_print_state(buf, _regulator_is_enabled(rdev));
 285 }
 286 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 287
 288 static ssize_t regulator_status_show(struct device *dev,
 289                                    struct device_attribute *attr, char *buf)
 290 {
 291         struct regulator_dev *rdev = dev_get_drvdata(dev);
 292         int status;
 293         char *label;
 294
 295         status = rdev->desc->ops->get_status(rdev);
 296         if (status < 0)
 297                 return status;
 298
 299         switch (status) {
 300         case REGULATOR_STATUS_OFF:
 301                 label = "off";
 302                 break;
 303         case REGULATOR_STATUS_ON:
 304                 label = "on";
 305                 break;
 306         case REGULATOR_STATUS_ERROR:
 307                 label = "error";
 308                 break;
 309         case REGULATOR_STATUS_FAST:
 310                 label = "fast";
 311                 break;
 312         case REGULATOR_STATUS_NORMAL:
 313                 label = "normal";
 314                 break;
 315         case REGULATOR_STATUS_IDLE:
 316                 label = "idle";
 317                 break;
 318         case REGULATOR_STATUS_STANDBY:
 319                 label = "standby";
 320                 break;
 321         default:
 322                 return -ERANGE;
 323         }
 324
 325         return sprintf(buf, "%s\n", label);
 326 }
 327 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 328
 329 static ssize_t regulator_min_uA_show(struct device *dev,
 330                                     struct device_attribute *attr, char *buf)
 331 {
 332         struct regulator_dev *rdev = dev_get_drvdata(dev);
 333
 334         if (!rdev->constraints)
 335                 return sprintf(buf, "constraint not defined\n");
 336
 337         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 338 }
 339 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 340
 341 static ssize_t regulator_max_uA_show(struct device *dev,
 342                                     struct device_attribute *attr, char *buf)
 343 {
 344         struct regulator_dev *rdev = dev_get_drvdata(dev);
 345
 346         if (!rdev->constraints)
 347                 return sprintf(buf, "constraint not defined\n");
 348
 349         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 350 }
 351 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 352
 353 static ssize_t regulator_min_uV_show(struct device *dev,
 354                                     struct device_attribute *attr, char *buf)
 355 {
 356         struct regulator_dev *rdev = dev_get_drvdata(dev);
 357
 358         if (!rdev->constraints)
 359                 return sprintf(buf, "constraint not defined\n");
 360
 361         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 362 }
 363 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 364
 365 static ssize_t regulator_max_uV_show(struct device *dev,
 366                                     struct device_attribute *attr, char *buf)
 367 {
 368         struct regulator_dev *rdev = dev_get_drvdata(dev);
 369
 370         if (!rdev->constraints)
 371                 return sprintf(buf, "constraint not defined\n");
 372
 373         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 374 }
 375 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 376
 377 static ssize_t regulator_total_uA_show(struct device *dev,
 378                                       struct device_attribute *attr, char *buf)
 379 {
 380         struct regulator_dev *rdev = dev_get_drvdata(dev);
 381         struct regulator *regulator;
 382         int uA = 0;
 383
 384         mutex_lock(&rdev->mutex);
 385         list_for_each_entry(regulator, &rdev->consumer_list, list)
 386             uA += regulator->uA_load;
 387         mutex_unlock(&rdev->mutex);
 388         return sprintf(buf, "%d\n", uA);
 389 }
 390 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 391
 392 static ssize_t regulator_num_users_show(struct device *dev,
 393                                       struct device_attribute *attr, char *buf)
 394 {
 395         struct regulator_dev *rdev = dev_get_drvdata(dev);
 396         return sprintf(buf, "%d\n", rdev->use_count);
 397 }
 398
 399 static ssize_t regulator_type_show(struct device *dev,
 400                                   struct device_attribute *attr, char *buf)
 401 {
 402         struct regulator_dev *rdev = dev_get_drvdata(dev);
 403
 404         switch (rdev->desc->type) {
 405         case REGULATOR_VOLTAGE:
 406                 return sprintf(buf, "voltage\n");
 407         case REGULATOR_CURRENT:
 408                 return sprintf(buf, "current\n");
 409         }
 410         return sprintf(buf, "unknown\n");
 411 }
 412
 413 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 414                                 struct device_attribute *attr, char *buf)
 415 {
 416         struct regulator_dev *rdev = dev_get_drvdata(dev);
 417
 418         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 419 }
 420 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 421                 regulator_suspend_mem_uV_show, NULL);
 422
 423 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 424                                 struct device_attribute *attr, char *buf)
 425 {
 426         struct regulator_dev *rdev = dev_get_drvdata(dev);
 427
 428         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 429 }
 430 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 431                 regulator_suspend_disk_uV_show, NULL);
 432
 433 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 434                                 struct device_attribute *attr, char *buf)
 435 {
 436         struct regulator_dev *rdev = dev_get_drvdata(dev);
 437
 438         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 439 }
 440 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 441                 regulator_suspend_standby_uV_show, NULL);
 442
 443 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 444                                 struct device_attribute *attr, char *buf)
 445 {
 446         struct regulator_dev *rdev = dev_get_drvdata(dev);
 447
 448         return regulator_print_opmode(buf,
 449                 rdev->constraints->state_mem.mode);
 450 }
 451 static DEVICE_ATTR(suspend_mem_mode, 0444,
 452                 regulator_suspend_mem_mode_show, NULL);
 453
 454 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 455                                 struct device_attribute *attr, char *buf)
 456 {
 457         struct regulator_dev *rdev = dev_get_drvdata(dev);
 458
 459         return regulator_print_opmode(buf,
 460                 rdev->constraints->state_disk.mode);
 461 }
 462 static DEVICE_ATTR(suspend_disk_mode, 0444,
 463                 regulator_suspend_disk_mode_show, NULL);
 464
 465 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 466                                 struct device_attribute *attr, char *buf)
 467 {
 468         struct regulator_dev *rdev = dev_get_drvdata(dev);
 469
 470         return regulator_print_opmode(buf,
 471                 rdev->constraints->state_standby.mode);
 472 }
 473 static DEVICE_ATTR(suspend_standby_mode, 0444,
 474                 regulator_suspend_standby_mode_show, NULL);
 475
 476 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 477                                    struct device_attribute *attr, char *buf)
 478 {
 479         struct regulator_dev *rdev = dev_get_drvdata(dev);
 480
 481         return regulator_print_state(buf,
 482                         rdev->constraints->state_mem.enabled);
 483 }
 484 static DEVICE_ATTR(suspend_mem_state, 0444,
 485                 regulator_suspend_mem_state_show, NULL);
 486
 487 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 488                                    struct device_attribute *attr, char *buf)
 489 {
 490         struct regulator_dev *rdev = dev_get_drvdata(dev);
 491
 492         return regulator_print_state(buf,
 493                         rdev->constraints->state_disk.enabled);
 494 }
 495 static DEVICE_ATTR(suspend_disk_state, 0444,
 496                 regulator_suspend_disk_state_show, NULL);
 497
 498 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 499                                    struct device_attribute *attr, char *buf)
 500 {
 501         struct regulator_dev *rdev = dev_get_drvdata(dev);
 502
 503         return regulator_print_state(buf,
 504                         rdev->constraints->state_standby.enabled);
 505 }
 506 static DEVICE_ATTR(suspend_standby_state, 0444,
 507                 regulator_suspend_standby_state_show, NULL);
 508
 509
 510 /*
 511  * These are the only attributes are present for all regulators.
 512  * Other attributes are a function of regulator functionality.
 513  */
 514 static struct device_attribute regulator_dev_attrs[] = {
 515         __ATTR(name, 0444, regulator_name_show, NULL),
 516         __ATTR(num_users, 0444, regulator_num_users_show, NULL),
 517         __ATTR(type, 0444, regulator_type_show, NULL),
 518         __ATTR_NULL,
 519 };
 520
 521 static void regulator_dev_release(struct device *dev)
 522 {
 523         struct regulator_dev *rdev = dev_get_drvdata(dev);
 524         kfree(rdev);
 525 }
 526
 527 static struct class regulator_class = {
 528         .name = "regulator",
 529         .dev_release = regulator_dev_release,
 530         .dev_attrs = regulator_dev_attrs,
 531 };
 532
 533 /* Calculate the new optimum regulator operating mode based on the new total
 534  * consumer load. All locks held by caller */
 535 static void drms_uA_update(struct regulator_dev *rdev)
 536 {
 537         struct regulator *sibling;
 538         int current_uA = 0, output_uV, input_uV, err;
 539         unsigned int mode;
 540
 541         err = regulator_check_drms(rdev);
 542         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 543             !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode);
 544         return;
 545
 546         /* get output voltage */
 547         output_uV = rdev->desc->ops->get_voltage(rdev);
 548         if (output_uV <= 0)
 549                 return;
 550
 551         /* get input voltage */
 552         if (rdev->supply && rdev->supply->desc->ops->get_voltage)
 553                 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
 554         else
 555                 input_uV = rdev->constraints->input_uV;
 556         if (input_uV <= 0)
 557                 return;
 558
 559         /* calc total requested load */
 560         list_for_each_entry(sibling, &rdev->consumer_list, list)
 561             current_uA += sibling->uA_load;
 562
 563         /* now get the optimum mode for our new total regulator load */
 564         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 565                                                   output_uV, current_uA);
 566
 567         /* check the new mode is allowed */
 568         err = regulator_check_mode(rdev, mode);
 569         if (err == 0)
 570                 rdev->desc->ops->set_mode(rdev, mode);
 571 }
 572
 573 static int suspend_set_state(struct regulator_dev *rdev,
 574         struct regulator_state *rstate)
 575 {
 576         int ret = 0;
 577
 578         /* enable & disable are mandatory for suspend control */
 579         if (!rdev->desc->ops->set_suspend_enable ||
 580                 !rdev->desc->ops->set_suspend_disable) {
 581                 printk(KERN_ERR "%s: no way to set suspend state\n",
 582                         __func__);
 583                 return -EINVAL;
 584         }
 585
 586         if (rstate->enabled)
 587                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 588         else
 589                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 590         if (ret < 0) {
 591                 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
 592                 return ret;
 593         }
 594
 595         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 596                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 597                 if (ret < 0) {
 598                         printk(KERN_ERR "%s: failed to set voltage\n",
 599                                 __func__);
 600                         return ret;
 601                 }
 602         }
 603
 604         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 605                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 606                 if (ret < 0) {
 607                         printk(KERN_ERR "%s: failed to set mode\n", __func__);
 608                         return ret;
 609                 }
 610         }
 611         return ret;
 612 }
 613
 614 /* locks held by caller */
 615 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 616 {
 617         if (!rdev->constraints)
 618                 return -EINVAL;
 619
 620         switch (state) {
 621         case PM_SUSPEND_STANDBY:
 622                 return suspend_set_state(rdev,
 623                         &rdev->constraints->state_standby);
 624         case PM_SUSPEND_MEM:
 625                 return suspend_set_state(rdev,
 626                         &rdev->constraints->state_mem);
 627         case PM_SUSPEND_MAX:
 628                 return suspend_set_state(rdev,
 629                         &rdev->constraints->state_disk);
 630         default:
 631                 return -EINVAL;
 632         }
 633 }
 634
 635 static void print_constraints(struct regulator_dev *rdev)
 636 {
 637         struct regulation_constraints *constraints = rdev->constraints;
 638         char buf[80];
 639         int count;
 640
 641         if (rdev->desc->type == REGULATOR_VOLTAGE) {
 642                 if (constraints->min_uV == constraints->max_uV)
 643                         count = sprintf(buf, "%d mV ",
 644                                         constraints->min_uV / 1000);
 645                 else
 646                         count = sprintf(buf, "%d <--> %d mV ",
 647                                         constraints->min_uV / 1000,
 648                                         constraints->max_uV / 1000);
 649         } else {
 650                 if (constraints->min_uA == constraints->max_uA)
 651                         count = sprintf(buf, "%d mA ",
 652                                         constraints->min_uA / 1000);
 653                 else
 654                         count = sprintf(buf, "%d <--> %d mA ",
 655                                         constraints->min_uA / 1000,
 656                                         constraints->max_uA / 1000);
 657         }
 658         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 659                 count += sprintf(buf + count, "fast ");
 660         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 661                 count += sprintf(buf + count, "normal ");
 662         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 663                 count += sprintf(buf + count, "idle ");
 664         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 665                 count += sprintf(buf + count, "standby");
 666
 667         printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf);
 668 }
 669
 670 /**
 671  * set_machine_constraints - sets regulator constraints
 672  * @rdev: regulator source
 673  * @constraints: constraints to apply
 674  *
 675  * Allows platform initialisation code to define and constrain
 676  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 677  * Constraints *must* be set by platform code in order for some
 678  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 679  * set_mode.
 680  */
 681 static int set_machine_constraints(struct regulator_dev *rdev,
 682         struct regulation_constraints *constraints)
 683 {
 684         int ret = 0;
 685         const char *name;
 686         struct regulator_ops *ops = rdev->desc->ops;
 687
 688         if (constraints->name)
 689                 name = constraints->name;
 690         else if (rdev->desc->name)
 691                 name = rdev->desc->name;
 692         else
 693                 name = "regulator";
 694
 695         /* constrain machine-level voltage specs to fit
 696          * the actual range supported by this regulator.
 697          */
 698         if (ops->list_voltage && rdev->desc->n_voltages) {
 699                 int     count = rdev->desc->n_voltages;
 700                 int     i;
 701                 int     min_uV = INT_MAX;
 702                 int     max_uV = INT_MIN;
 703                 int     cmin = constraints->min_uV;
 704                 int     cmax = constraints->max_uV;
 705
 706                 /* it's safe to autoconfigure fixed-voltage supplies */
 707                 if (count == 1 && !cmin) {
 708                         cmin = INT_MIN;
 709                         cmax = INT_MAX;
 710                 }
 711
 712                 /* voltage constraints are optional */
 713                 if ((cmin == 0) && (cmax == 0))
 714                         goto out;
 715
 716                 /* else require explicit machine-level constraints */
 717                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 718                         pr_err("%s: %s '%s' voltage constraints\n",
 719                                        __func__, "invalid", name);
 720                         ret = -EINVAL;
 721                         goto out;
 722                 }
 723
 724                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 725                 for (i = 0; i < count; i++) {
 726                         int     value;
 727
 728                         value = ops->list_voltage(rdev, i);
 729                         if (value <= 0)
 730                                 continue;
 731
 732                         /* maybe adjust [min_uV..max_uV] */
 733                         if (value >= cmin && value < min_uV)
 734                                 min_uV = value;
 735                         if (value <= cmax && value > max_uV)
 736                                 max_uV = value;
 737                 }
 738
 739                 /* final: [min_uV..max_uV] valid iff constraints valid */
 740                 if (max_uV < min_uV) {
 741                         pr_err("%s: %s '%s' voltage constraints\n",
 742                                        __func__, "unsupportable", name);
 743                         ret = -EINVAL;
 744                         goto out;
 745                 }
 746
 747                 /* use regulator's subset of machine constraints */
 748                 if (constraints->min_uV < min_uV) {
 749                         pr_debug("%s: override '%s' %s, %d -> %d\n",
 750                                        __func__, name, "min_uV",
 751                                         constraints->min_uV, min_uV);
 752                         constraints->min_uV = min_uV;
 753                 }
 754                 if (constraints->max_uV > max_uV) {
 755                         pr_debug("%s: override '%s' %s, %d -> %d\n",
 756                                        __func__, name, "max_uV",
 757                                         constraints->max_uV, max_uV);
 758                         constraints->max_uV = max_uV;
 759                 }
 760         }
 761
 762         rdev->constraints = constraints;
 763
 764         /* do we need to apply the constraint voltage */
 765         if (rdev->constraints->apply_uV &&
 766                 rdev->constraints->min_uV == rdev->constraints->max_uV &&
 767                 ops->set_voltage) {
 768                 ret = ops->set_voltage(rdev,
 769                         rdev->constraints->min_uV, rdev->constraints->max_uV);
 770                         if (ret < 0) {
 771                                 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
 772                                        __func__,
 773                                        rdev->constraints->min_uV, name);
 774                                 rdev->constraints = NULL;
 775                                 goto out;
 776                         }
 777         }
 778
 779         /* are we enabled at boot time by firmware / bootloader */
 780         if (rdev->constraints->boot_on)
 781                 rdev->use_count = 1;
 782
 783         /* do we need to setup our suspend state */
 784         if (constraints->initial_state) {
 785                 ret = suspend_prepare(rdev, constraints->initial_state);
 786                 if (ret < 0) {
 787                         printk(KERN_ERR "%s: failed to set suspend state for %s\n",
 788                                __func__, name);
 789                         rdev->constraints = NULL;
 790                         goto out;
 791                 }
 792         }
 793
 794         if (constraints->initial_mode) {
 795                 if (!ops->set_mode) {
 796                         printk(KERN_ERR "%s: no set_mode operation for %s\n",
 797                                __func__, name);
 798                         ret = -EINVAL;
 799                         goto out;
 800                 }
 801
 802                 ret = ops->set_mode(rdev, constraints->initial_mode);
 803                 if (ret < 0) {
 804                         printk(KERN_ERR
 805                                "%s: failed to set initial mode for %s: %d\n",
 806                                __func__, name, ret);
 807                         goto out;
 808                 }
 809         }
 810
 811         /* if always_on is set then turn the regulator on if it's not
 812          * already on. */
 813         if (constraints->always_on && ops->enable &&
 814             ((ops->is_enabled && !ops->is_enabled(rdev)) ||
 815              (!ops->is_enabled && !constraints->boot_on))) {
 816                 ret = ops->enable(rdev);
 817                 if (ret < 0) {
 818                         printk(KERN_ERR "%s: failed to enable %s\n",
 819                                __func__, name);
 820                         rdev->constraints = NULL;
 821                         goto out;
 822                 }
 823         }
 824
 825         print_constraints(rdev);
 826 out:
 827         return ret;
 828 }
 829
 830 /**
 831  * set_supply - set regulator supply regulator
 832  * @rdev: regulator name
 833  * @supply_rdev: supply regulator name
 834  *
 835  * Called by platform initialisation code to set the supply regulator for this
 836  * regulator. This ensures that a regulators supply will also be enabled by the
 837  * core if it's child is enabled.
 838  */
 839 static int set_supply(struct regulator_dev *rdev,
 840         struct regulator_dev *supply_rdev)
 841 {
 842         int err;
 843
 844         err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
 845                                 "supply");
 846         if (err) {
 847                 printk(KERN_ERR
 848                        "%s: could not add device link %s err %d\n",
 849                        __func__, supply_rdev->dev.kobj.name, err);
 850                        goto out;
 851         }
 852         rdev->supply = supply_rdev;
 853         list_add(&rdev->slist, &supply_rdev->supply_list);
 854 out:
 855         return err;
 856 }
 857
 858 /**
 859  * set_consumer_device_supply: Bind a regulator to a symbolic supply
 860  * @rdev:         regulator source
 861  * @consumer_dev: device the supply applies to
 862  * @supply:       symbolic name for supply
 863  *
 864  * Allows platform initialisation code to map physical regulator
 865  * sources to symbolic names for supplies for use by devices.  Devices
 866  * should use these symbolic names to request regulators, avoiding the
 867  * need to provide board-specific regulator names as platform data.
 868  */
 869 static int set_consumer_device_supply(struct regulator_dev *rdev,
 870         struct device *consumer_dev, const char *supply)
 871 {
 872         struct regulator_map *node;
 873
 874         if (supply == NULL)
 875                 return -EINVAL;
 876
 877         list_for_each_entry(node, &regulator_map_list, list) {
 878                 if (consumer_dev != node->dev)
 879                         continue;
 880                 if (strcmp(node->supply, supply) != 0)
 881                         continue;
 882
 883                 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
 884                                 dev_name(&node->regulator->dev),
 885                                 node->regulator->desc->name,
 886                                 supply,
 887                                 dev_name(&rdev->dev), rdev->desc->name);
 888                 return -EBUSY;
 889         }
 890
 891         node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
 892         if (node == NULL)
 893                 return -ENOMEM;
 894
 895         node->regulator = rdev;
 896         node->dev = consumer_dev;
 897         node->supply = supply;
 898
 899         list_add(&node->list, &regulator_map_list);
 900         return 0;
 901 }
 902
 903 static void unset_consumer_device_supply(struct regulator_dev *rdev,
 904         struct device *consumer_dev)
 905 {
 906         struct regulator_map *node, *n;
 907
 908         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 909                 if (rdev == node->regulator &&
 910                         consumer_dev == node->dev) {
 911                         list_del(&node->list);
 912                         kfree(node);
 913                         return;
 914                 }
 915         }
 916 }
 917
 918 static void unset_regulator_supplies(struct regulator_dev *rdev)
 919 {
 920         struct regulator_map *node, *n;
 921
 922         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 923                 if (rdev == node->regulator) {
 924                         list_del(&node->list);
 925                         kfree(node);
 926                         return;
 927                 }
 928         }
 929 }
 930
 931 #define REG_STR_SIZE    32
 932
 933 static struct regulator *create_regulator(struct regulator_dev *rdev,
 934                                           struct device *dev,
 935                                           const char *supply_name)
 936 {
 937         struct regulator *regulator;
 938         char buf[REG_STR_SIZE];
 939         int err, size;
 940
 941         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
 942         if (regulator == NULL)
 943                 return NULL;
 944
 945         mutex_lock(&rdev->mutex);
 946         regulator->rdev = rdev;
 947         list_add(&regulator->list, &rdev->consumer_list);
 948
 949         if (dev) {
 950                 /* create a 'requested_microamps_name' sysfs entry */
 951                 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
 952                         supply_name);
 953                 if (size >= REG_STR_SIZE)
 954                         goto overflow_err;
 955
 956                 regulator->dev = dev;
 957                 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
 958                 if (regulator->dev_attr.attr.name == NULL)
 959                         goto attr_name_err;
 960
 961                 regulator->dev_attr.attr.owner = THIS_MODULE;
 962                 regulator->dev_attr.attr.mode = 0444;
 963                 regulator->dev_attr.show = device_requested_uA_show;
 964                 err = device_create_file(dev, &regulator->dev_attr);
 965                 if (err < 0) {
 966                         printk(KERN_WARNING "%s: could not add regulator_dev"
 967                                 " load sysfs\n", __func__);
 968                         goto attr_name_err;
 969                 }
 970
 971                 /* also add a link to the device sysfs entry */
 972                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
 973                                  dev->kobj.name, supply_name);
 974                 if (size >= REG_STR_SIZE)
 975                         goto attr_err;
 976
 977                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
 978                 if (regulator->supply_name == NULL)
 979                         goto attr_err;
 980
 981                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
 982                                         buf);
 983                 if (err) {
 984                         printk(KERN_WARNING
 985                                "%s: could not add device link %s err %d\n",
 986                                __func__, dev->kobj.name, err);
 987                         device_remove_file(dev, &regulator->dev_attr);
 988                         goto link_name_err;
 989                 }
 990         }
 991         mutex_unlock(&rdev->mutex);
 992         return regulator;
 993 link_name_err:
 994         kfree(regulator->supply_name);
 995 attr_err:
 996         device_remove_file(regulator->dev, &regulator->dev_attr);
 997 attr_name_err:
 998         kfree(regulator->dev_attr.attr.name);
 999 overflow_err:
1000         list_del(&regulator->list);
1001         kfree(regulator);
1002         mutex_unlock(&rdev->mutex);
1003         return NULL;
1004 }
1005
1006 /**
1007  * regulator_get - lookup and obtain a reference to a regulator.
1008  * @dev: device for regulator "consumer"
1009  * @id: Supply name or regulator ID.
1010  *
1011  * Returns a struct regulator corresponding to the regulator producer,
1012  * or IS_ERR() condition containing errno.
1013  *
1014  * Use of supply names configured via regulator_set_device_supply() is
1015  * strongly encouraged.  It is recommended that the supply name used
1016  * should match the name used for the supply and/or the relevant
1017  * device pins in the datasheet.
1018  */
1019 struct regulator *regulator_get(struct device *dev, const char *id)
1020 {
1021         struct regulator_dev *rdev;
1022         struct regulator_map *map;
1023         struct regulator *regulator = ERR_PTR(-ENODEV);
1024
1025         if (id == NULL) {
1026                 printk(KERN_ERR "regulator: get() with no identifier\n");
1027                 return regulator;
1028         }
1029
1030         mutex_lock(&regulator_list_mutex);
1031
1032         list_for_each_entry(map, &regulator_map_list, list) {
1033                 if (dev == map->dev &&
1034                     strcmp(map->supply, id) == 0) {
1035                         rdev = map->regulator;
1036                         goto found;
1037                 }
1038         }
1039         printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n",
1040                id);
1041         mutex_unlock(&regulator_list_mutex);
1042         return regulator;
1043
1044 found:
1045         if (!try_module_get(rdev->owner))
1046                 goto out;
1047
1048         regulator = create_regulator(rdev, dev, id);
1049         if (regulator == NULL) {
1050                 regulator = ERR_PTR(-ENOMEM);
1051                 module_put(rdev->owner);
1052         }
1053
1054 out:
1055         mutex_unlock(&regulator_list_mutex);
1056         return regulator;
1057 }
1058 EXPORT_SYMBOL_GPL(regulator_get);
1059
1060 /**
1061  * regulator_put - "free" the regulator source
1062  * @regulator: regulator source
1063  *
1064  * Note: drivers must ensure that all regulator_enable calls made on this
1065  * regulator source are balanced by regulator_disable calls prior to calling
1066  * this function.
1067  */
1068 void regulator_put(struct regulator *regulator)
1069 {
1070         struct regulator_dev *rdev;
1071
1072         if (regulator == NULL || IS_ERR(regulator))
1073                 return;
1074
1075         mutex_lock(&regulator_list_mutex);
1076         rdev = regulator->rdev;
1077
1078         if (WARN(regulator->enabled, "Releasing supply %s while enabled\n",
1079                                regulator->supply_name))
1080                 _regulator_disable(rdev);
1081
1082         /* remove any sysfs entries */
1083         if (regulator->dev) {
1084                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1085                 kfree(regulator->supply_name);
1086                 device_remove_file(regulator->dev, &regulator->dev_attr);
1087                 kfree(regulator->dev_attr.attr.name);
1088         }
1089         list_del(&regulator->list);
1090         kfree(regulator);
1091
1092         module_put(rdev->owner);
1093         mutex_unlock(&regulator_list_mutex);
1094 }
1095 EXPORT_SYMBOL_GPL(regulator_put);
1096
1097 /* locks held by regulator_enable() */
1098 static int _regulator_enable(struct regulator_dev *rdev)
1099 {
1100         int ret = -EINVAL;
1101
1102         if (!rdev->constraints) {
1103                 printk(KERN_ERR "%s: %s has no constraints\n",
1104                        __func__, rdev->desc->name);
1105                 return ret;
1106         }
1107
1108         /* do we need to enable the supply regulator first */
1109         if (rdev->supply) {
1110                 ret = _regulator_enable(rdev->supply);
1111                 if (ret < 0) {
1112                         printk(KERN_ERR "%s: failed to enable %s: %d\n",
1113                                __func__, rdev->desc->name, ret);
1114                         return ret;
1115                 }
1116         }
1117
1118         /* check voltage and requested load before enabling */
1119         if (rdev->desc->ops->enable) {
1120
1121                 if (rdev->constraints &&
1122                         (rdev->constraints->valid_ops_mask &
1123                         REGULATOR_CHANGE_DRMS))
1124                         drms_uA_update(rdev);
1125
1126                 ret = rdev->desc->ops->enable(rdev);
1127                 if (ret < 0) {
1128                         printk(KERN_ERR "%s: failed to enable %s: %d\n",
1129                                __func__, rdev->desc->name, ret);
1130                         return ret;
1131                 }
1132                 rdev->use_count++;
1133                 return ret;
1134         }
1135
1136         return ret;
1137 }
1138
1139 /**
1140  * regulator_enable - enable regulator output
1141  * @regulator: regulator source
1142  *
1143  * Request that the regulator be enabled with the regulator output at
1144  * the predefined voltage or current value.  Calls to regulator_enable()
1145  * must be balanced with calls to regulator_disable().
1146  *
1147  * NOTE: the output value can be set by other drivers, boot loader or may be
1148  * hardwired in the regulator.
1149  */
1150 int regulator_enable(struct regulator *regulator)
1151 {
1152         struct regulator_dev *rdev = regulator->rdev;
1153         int ret = 0;
1154
1155         mutex_lock(&rdev->mutex);
1156         if (regulator->enabled == 0)
1157                 ret = _regulator_enable(rdev);
1158         else if (regulator->enabled < 0)
1159                 ret = -EIO;
1160         if (ret == 0)
1161                 regulator->enabled++;
1162         mutex_unlock(&rdev->mutex);
1163         return ret;
1164 }
1165 EXPORT_SYMBOL_GPL(regulator_enable);
1166
1167 /* locks held by regulator_disable() */
1168 static int _regulator_disable(struct regulator_dev *rdev)
1169 {
1170         int ret = 0;
1171
1172         /* are we the last user and permitted to disable ? */
1173         if (rdev->use_count == 1 && !rdev->constraints->always_on) {
1174
1175                 /* we are last user */
1176                 if (rdev->desc->ops->disable) {
1177                         ret = rdev->desc->ops->disable(rdev);
1178                         if (ret < 0) {
1179                                 printk(KERN_ERR "%s: failed to disable %s\n",
1180                                        __func__, rdev->desc->name);
1181                                 return ret;
1182                         }
1183                 }
1184
1185                 /* decrease our supplies ref count and disable if required */
1186                 if (rdev->supply)
1187                         _regulator_disable(rdev->supply);
1188
1189                 rdev->use_count = 0;
1190         } else if (rdev->use_count > 1) {
1191
1192                 if (rdev->constraints &&
1193                         (rdev->constraints->valid_ops_mask &
1194                         REGULATOR_CHANGE_DRMS))
1195                         drms_uA_update(rdev);
1196
1197                 rdev->use_count--;
1198         }
1199         return ret;
1200 }
1201
1202 /**
1203  * regulator_disable - disable regulator output
1204  * @regulator: regulator source
1205  *
1206  * Disable the regulator output voltage or current.  Calls to
1207  * regulator_enable() must be balanced with calls to
1208  * regulator_disable().
1209  *
1210  * NOTE: this will only disable the regulator output if no other consumer
1211  * devices have it enabled, the regulator device supports disabling and
1212  * machine constraints permit this operation.
1213  */
1214 int regulator_disable(struct regulator *regulator)
1215 {
1216         struct regulator_dev *rdev = regulator->rdev;
1217         int ret = 0;
1218
1219         mutex_lock(&rdev->mutex);
1220         if (regulator->enabled == 1) {
1221                 ret = _regulator_disable(rdev);
1222                 if (ret == 0)
1223                         regulator->uA_load = 0;
1224         } else if (WARN(regulator->enabled <= 0,
1225                         "unbalanced disables for supply %s\n",
1226                         regulator->supply_name))
1227                 ret = -EIO;
1228         if (ret == 0)
1229                 regulator->enabled--;
1230         mutex_unlock(&rdev->mutex);
1231         return ret;
1232 }
1233 EXPORT_SYMBOL_GPL(regulator_disable);
1234
1235 /* locks held by regulator_force_disable() */
1236 static int _regulator_force_disable(struct regulator_dev *rdev)
1237 {
1238         int ret = 0;
1239
1240         /* force disable */
1241         if (rdev->desc->ops->disable) {
1242                 /* ah well, who wants to live forever... */
1243                 ret = rdev->desc->ops->disable(rdev);
1244                 if (ret < 0) {
1245                         printk(KERN_ERR "%s: failed to force disable %s\n",
1246                                __func__, rdev->desc->name);
1247                         return ret;
1248                 }
1249                 /* notify other consumers that power has been forced off */
1250                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
1251                         NULL);
1252         }
1253
1254         /* decrease our supplies ref count and disable if required */
1255         if (rdev->supply)
1256                 _regulator_disable(rdev->supply);
1257
1258         rdev->use_count = 0;
1259         return ret;
1260 }
1261
1262 /**
1263  * regulator_force_disable - force disable regulator output
1264  * @regulator: regulator source
1265  *
1266  * Forcibly disable the regulator output voltage or current.
1267  * NOTE: this *will* disable the regulator output even if other consumer
1268  * devices have it enabled. This should be used for situations when device
1269  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1270  */
1271 int regulator_force_disable(struct regulator *regulator)
1272 {
1273         int ret;
1274
1275         mutex_lock(&regulator->rdev->mutex);
1276         regulator->enabled = 0;
1277         regulator->uA_load = 0;
1278         ret = _regulator_force_disable(regulator->rdev);
1279         mutex_unlock(&regulator->rdev->mutex);
1280         return ret;
1281 }
1282 EXPORT_SYMBOL_GPL(regulator_force_disable);
1283
1284 static int _regulator_is_enabled(struct regulator_dev *rdev)
1285 {
1286         int ret;
1287
1288         mutex_lock(&rdev->mutex);
1289
1290         /* sanity check */
1291         if (!rdev->desc->ops->is_enabled) {
1292                 ret = -EINVAL;
1293                 goto out;
1294         }
1295
1296         ret = rdev->desc->ops->is_enabled(rdev);
1297 out:
1298         mutex_unlock(&rdev->mutex);
1299         return ret;
1300 }
1301
1302 /**
1303  * regulator_is_enabled - is the regulator output enabled
1304  * @regulator: regulator source
1305  *
1306  * Returns positive if the regulator driver backing the source/client
1307  * has requested that the device be enabled, zero if it hasn't, else a
1308  * negative errno code.
1309  *
1310  * Note that the device backing this regulator handle can have multiple
1311  * users, so it might be enabled even if regulator_enable() was never
1312  * called for this particular source.
1313  */
1314 int regulator_is_enabled(struct regulator *regulator)
1315 {
1316         return _regulator_is_enabled(regulator->rdev);
1317 }
1318 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1319
1320 /**
1321  * regulator_count_voltages - count regulator_list_voltage() selectors
1322  * @regulator: regulator source
1323  *
1324  * Returns number of selectors, or negative errno.  Selectors are
1325  * numbered starting at zero, and typically correspond to bitfields
1326  * in hardware registers.
1327  */
1328 int regulator_count_voltages(struct regulator *regulator)
1329 {
1330         struct regulator_dev    *rdev = regulator->rdev;
1331
1332         return rdev->desc->n_voltages ? : -EINVAL;
1333 }
1334 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1335
1336 /**
1337  * regulator_list_voltage - enumerate supported voltages
1338  * @regulator: regulator source
1339  * @selector: identify voltage to list
1340  * Context: can sleep
1341  *
1342  * Returns a voltage that can be passed to @regulator_set_voltage(),
1343  * zero if this selector code can't be used on this sytem, or a
1344  * negative errno.
1345  */
1346 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1347 {
1348         struct regulator_dev    *rdev = regulator->rdev;
1349         struct regulator_ops    *ops = rdev->desc->ops;
1350         int                     ret;
1351
1352         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1353                 return -EINVAL;
1354
1355         mutex_lock(&rdev->mutex);
1356         ret = ops->list_voltage(rdev, selector);
1357         mutex_unlock(&rdev->mutex);
1358
1359         if (ret > 0) {
1360                 if (ret < rdev->constraints->min_uV)
1361                         ret = 0;
1362                 else if (ret > rdev->constraints->max_uV)
1363                         ret = 0;
1364         }
1365
1366         return ret;
1367 }
1368 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1369
1370 /**
1371  * regulator_set_voltage - set regulator output voltage
1372  * @regulator: regulator source
1373  * @min_uV: Minimum required voltage in uV
1374  * @max_uV: Maximum acceptable voltage in uV
1375  *
1376  * Sets a voltage regulator to the desired output voltage. This can be set
1377  * during any regulator state. IOW, regulator can be disabled or enabled.
1378  *
1379  * If the regulator is enabled then the voltage will change to the new value
1380  * immediately otherwise if the regulator is disabled the regulator will
1381  * output at the new voltage when enabled.
1382  *
1383  * NOTE: If the regulator is shared between several devices then the lowest
1384  * request voltage that meets the system constraints will be used.
1385  * Regulator system constraints must be set for this regulator before
1386  * calling this function otherwise this call will fail.
1387  */
1388 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1389 {
1390         struct regulator_dev *rdev = regulator->rdev;
1391         int ret;
1392
1393         mutex_lock(&rdev->mutex);
1394
1395         /* sanity check */
1396         if (!rdev->desc->ops->set_voltage) {
1397                 ret = -EINVAL;
1398                 goto out;
1399         }
1400
1401         /* constraints check */
1402         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1403         if (ret < 0)
1404                 goto out;
1405         regulator->min_uV = min_uV;
1406         regulator->max_uV = max_uV;
1407         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1408
1409 out:
1410         _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
1411         mutex_unlock(&rdev->mutex);
1412         return ret;
1413 }
1414 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1415
1416 static int _regulator_get_voltage(struct regulator_dev *rdev)
1417 {
1418         /* sanity check */
1419         if (rdev->desc->ops->get_voltage)
1420                 return rdev->desc->ops->get_voltage(rdev);
1421         else
1422                 return -EINVAL;
1423 }
1424
1425 /**
1426  * regulator_get_voltage - get regulator output voltage
1427  * @regulator: regulator source
1428  *
1429  * This returns the current regulator voltage in uV.
1430  *
1431  * NOTE: If the regulator is disabled it will return the voltage value. This
1432  * function should not be used to determine regulator state.
1433  */
1434 int regulator_get_voltage(struct regulator *regulator)
1435 {
1436         int ret;
1437
1438         mutex_lock(&regulator->rdev->mutex);
1439
1440         ret = _regulator_get_voltage(regulator->rdev);
1441
1442         mutex_unlock(&regulator->rdev->mutex);
1443
1444         return ret;
1445 }
1446 EXPORT_SYMBOL_GPL(regulator_get_voltage);
1447
1448 /**
1449  * regulator_set_current_limit - set regulator output current limit
1450  * @regulator: regulator source
1451  * @min_uA: Minimuum supported current in uA
1452  * @max_uA: Maximum supported current in uA
1453  *
1454  * Sets current sink to the desired output current. This can be set during
1455  * any regulator state. IOW, regulator can be disabled or enabled.
1456  *
1457  * If the regulator is enabled then the current will change to the new value
1458  * immediately otherwise if the regulator is disabled the regulator will
1459  * output at the new current when enabled.
1460  *
1461  * NOTE: Regulator system constraints must be set for this regulator before
1462  * calling this function otherwise this call will fail.
1463  */
1464 int regulator_set_current_limit(struct regulator *regulator,
1465                                int min_uA, int max_uA)
1466 {
1467         struct regulator_dev *rdev = regulator->rdev;
1468         int ret;
1469
1470         mutex_lock(&rdev->mutex);
1471
1472         /* sanity check */
1473         if (!rdev->desc->ops->set_current_limit) {
1474                 ret = -EINVAL;
1475                 goto out;
1476         }
1477
1478         /* constraints check */
1479         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1480         if (ret < 0)
1481                 goto out;
1482
1483         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1484 out:
1485         mutex_unlock(&rdev->mutex);
1486         return ret;
1487 }
1488 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1489
1490 static int _regulator_get_current_limit(struct regulator_dev *rdev)
1491 {
1492         int ret;
1493
1494         mutex_lock(&rdev->mutex);
1495
1496         /* sanity check */
1497         if (!rdev->desc->ops->get_current_limit) {
1498                 ret = -EINVAL;
1499                 goto out;
1500         }
1501
1502         ret = rdev->desc->ops->get_current_limit(rdev);
1503 out:
1504         mutex_unlock(&rdev->mutex);
1505         return ret;
1506 }
1507
1508 /**
1509  * regulator_get_current_limit - get regulator output current
1510  * @regulator: regulator source
1511  *
1512  * This returns the current supplied by the specified current sink in uA.
1513  *
1514  * NOTE: If the regulator is disabled it will return the current value. This
1515  * function should not be used to determine regulator state.
1516  */
1517 int regulator_get_current_limit(struct regulator *regulator)
1518 {
1519         return _regulator_get_current_limit(regulator->rdev);
1520 }
1521 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1522
1523 /**
1524  * regulator_set_mode - set regulator operating mode
1525  * @regulator: regulator source
1526  * @mode: operating mode - one of the REGULATOR_MODE constants
1527  *
1528  * Set regulator operating mode to increase regulator efficiency or improve
1529  * regulation performance.
1530  *
1531  * NOTE: Regulator system constraints must be set for this regulator before
1532  * calling this function otherwise this call will fail.
1533  */
1534 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1535 {
1536         struct regulator_dev *rdev = regulator->rdev;
1537         int ret;
1538
1539         mutex_lock(&rdev->mutex);
1540
1541         /* sanity check */
1542         if (!rdev->desc->ops->set_mode) {
1543                 ret = -EINVAL;
1544                 goto out;
1545         }
1546
1547         /* constraints check */
1548         ret = regulator_check_mode(rdev, mode);
1549         if (ret < 0)
1550                 goto out;
1551
1552         ret = rdev->desc->ops->set_mode(rdev, mode);
1553 out:
1554         mutex_unlock(&rdev->mutex);
1555         return ret;
1556 }
1557 EXPORT_SYMBOL_GPL(regulator_set_mode);
1558
1559 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1560 {
1561         int ret;
1562
1563         mutex_lock(&rdev->mutex);
1564
1565         /* sanity check */
1566         if (!rdev->desc->ops->get_mode) {
1567                 ret = -EINVAL;
1568                 goto out;
1569         }
1570
1571         ret = rdev->desc->ops->get_mode(rdev);
1572 out:
1573         mutex_unlock(&rdev->mutex);
1574         return ret;
1575 }
1576
1577 /**
1578  * regulator_get_mode - get regulator operating mode
1579  * @regulator: regulator source
1580  *
1581  * Get the current regulator operating mode.
1582  */
1583 unsigned int regulator_get_mode(struct regulator *regulator)
1584 {
1585         return _regulator_get_mode(regulator->rdev);
1586 }
1587 EXPORT_SYMBOL_GPL(regulator_get_mode);
1588
1589 /**
1590  * regulator_set_optimum_mode - set regulator optimum operating mode
1591  * @regulator: regulator source
1592  * @uA_load: load current
1593  *
1594  * Notifies the regulator core of a new device load. This is then used by
1595  * DRMS (if enabled by constraints) to set the most efficient regulator
1596  * operating mode for the new regulator loading.
1597  *
1598  * Consumer devices notify their supply regulator of the maximum power
1599  * they will require (can be taken from device datasheet in the power
1600  * consumption tables) when they change operational status and hence power
1601  * state. Examples of operational state changes that can affect power
1602  * consumption are :-
1603  *
1604  *    o Device is opened / closed.
1605  *    o Device I/O is about to begin or has just finished.
1606  *    o Device is idling in between work.
1607  *
1608  * This information is also exported via sysfs to userspace.
1609  *
1610  * DRMS will sum the total requested load on the regulator and change
1611  * to the most efficient operating mode if platform constraints allow.
1612  *
1613  * Returns the new regulator mode or error.
1614  */
1615 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1616 {
1617         struct regulator_dev *rdev = regulator->rdev;
1618         struct regulator *consumer;
1619         int ret, output_uV, input_uV, total_uA_load = 0;
1620         unsigned int mode;
1621
1622         mutex_lock(&rdev->mutex);
1623
1624         regulator->uA_load = uA_load;
1625         ret = regulator_check_drms(rdev);
1626         if (ret < 0)
1627                 goto out;
1628         ret = -EINVAL;
1629
1630         /* sanity check */
1631         if (!rdev->desc->ops->get_optimum_mode)
1632                 goto out;
1633
1634         /* get output voltage */
1635         output_uV = rdev->desc->ops->get_voltage(rdev);
1636         if (output_uV <= 0) {
1637                 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1638                         __func__, rdev->desc->name);
1639                 goto out;
1640         }
1641
1642         /* get input voltage */
1643         if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1644                 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1645         else
1646                 input_uV = rdev->constraints->input_uV;
1647         if (input_uV <= 0) {
1648                 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1649                         __func__, rdev->desc->name);
1650                 goto out;
1651         }
1652
1653         /* calc total requested load for this regulator */
1654         list_for_each_entry(consumer, &rdev->consumer_list, list)
1655             total_uA_load += consumer->uA_load;
1656
1657         mode = rdev->desc->ops->get_optimum_mode(rdev,
1658                                                  input_uV, output_uV,
1659                                                  total_uA_load);
1660         ret = regulator_check_mode(rdev, mode);
1661         if (ret < 0) {
1662                 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1663                         " %d uA %d -> %d uV\n", __func__, rdev->desc->name,
1664                         total_uA_load, input_uV, output_uV);
1665                 goto out;
1666         }
1667
1668         ret = rdev->desc->ops->set_mode(rdev, mode);
1669         if (ret < 0) {
1670                 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1671                         __func__, mode, rdev->desc->name);
1672                 goto out;
1673         }
1674         ret = mode;
1675 out:
1676         mutex_unlock(&rdev->mutex);
1677         return ret;
1678 }
1679 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1680
1681 /**
1682  * regulator_register_notifier - register regulator event notifier
1683  * @regulator: regulator source
1684  * @nb: notifier block
1685  *
1686  * Register notifier block to receive regulator events.
1687  */
1688 int regulator_register_notifier(struct regulator *regulator,
1689                               struct notifier_block *nb)
1690 {
1691         return blocking_notifier_chain_register(&regulator->rdev->notifier,
1692                                                 nb);
1693 }
1694 EXPORT_SYMBOL_GPL(regulator_register_notifier);
1695
1696 /**
1697  * regulator_unregister_notifier - unregister regulator event notifier
1698  * @regulator: regulator source
1699  * @nb: notifier block
1700  *
1701  * Unregister regulator event notifier block.
1702  */
1703 int regulator_unregister_notifier(struct regulator *regulator,
1704                                 struct notifier_block *nb)
1705 {
1706         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1707                                                   nb);
1708 }
1709 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1710
1711 /* notify regulator consumers and downstream regulator consumers.
1712  * Note mutex must be held by caller.
1713  */
1714 static void _notifier_call_chain(struct regulator_dev *rdev,
1715                                   unsigned long event, void *data)
1716 {
1717         struct regulator_dev *_rdev;
1718
1719         /* call rdev chain first */
1720         blocking_notifier_call_chain(&rdev->notifier, event, NULL);
1721
1722         /* now notify regulator we supply */
1723         list_for_each_entry(_rdev, &rdev->supply_list, slist) {
1724           mutex_lock(&_rdev->mutex);
1725           _notifier_call_chain(_rdev, event, data);
1726           mutex_unlock(&_rdev->mutex);
1727         }
1728 }
1729
1730 /**
1731  * regulator_bulk_get - get multiple regulator consumers
1732  *
1733  * @dev:           Device to supply
1734  * @num_consumers: Number of consumers to register
1735  * @consumers:     Configuration of consumers; clients are stored here.
1736  *
1737  * @return 0 on success, an errno on failure.
1738  *
1739  * This helper function allows drivers to get several regulator
1740  * consumers in one operation.  If any of the regulators cannot be
1741  * acquired then any regulators that were allocated will be freed
1742  * before returning to the caller.
1743  */
1744 int regulator_bulk_get(struct device *dev, int num_consumers,
1745                        struct regulator_bulk_data *consumers)
1746 {
1747         int i;
1748         int ret;
1749
1750         for (i = 0; i < num_consumers; i++)
1751                 consumers[i].consumer = NULL;
1752
1753         for (i = 0; i < num_consumers; i++) {
1754                 consumers[i].consumer = regulator_get(dev,
1755                                                       consumers[i].supply);
1756                 if (IS_ERR(consumers[i].consumer)) {
1757                         dev_err(dev, "Failed to get supply '%s'\n",
1758                                 consumers[i].supply);
1759                         ret = PTR_ERR(consumers[i].consumer);
1760                         consumers[i].consumer = NULL;
1761                         goto err;
1762                 }
1763         }
1764
1765         return 0;
1766
1767 err:
1768         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1769                 regulator_put(consumers[i].consumer);
1770
1771         return ret;
1772 }
1773 EXPORT_SYMBOL_GPL(regulator_bulk_get);
1774
1775 /**
1776  * regulator_bulk_enable - enable multiple regulator consumers
1777  *
1778  * @num_consumers: Number of consumers
1779  * @consumers:     Consumer data; clients are stored here.
1780  * @return         0 on success, an errno on failure
1781  *
1782  * This convenience API allows consumers to enable multiple regulator
1783  * clients in a single API call.  If any consumers cannot be enabled
1784  * then any others that were enabled will be disabled again prior to
1785  * return.
1786  */
1787 int regulator_bulk_enable(int num_consumers,
1788                           struct regulator_bulk_data *consumers)
1789 {
1790         int i;
1791         int ret;
1792
1793         for (i = 0; i < num_consumers; i++) {
1794                 ret = regulator_enable(consumers[i].consumer);
1795                 if (ret != 0)
1796                         goto err;
1797         }
1798
1799         return 0;
1800
1801 err:
1802         printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply);
1803         for (i = 0; i < num_consumers; i++)
1804                 regulator_disable(consumers[i].consumer);
1805
1806         return ret;
1807 }
1808 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
1809
1810 /**
1811  * regulator_bulk_disable - disable multiple regulator consumers
1812  *
1813  * @num_consumers: Number of consumers
1814  * @consumers:     Consumer data; clients are stored here.
1815  * @return         0 on success, an errno on failure
1816  *
1817  * This convenience API allows consumers to disable multiple regulator
1818  * clients in a single API call.  If any consumers cannot be enabled
1819  * then any others that were disabled will be disabled again prior to
1820  * return.
1821  */
1822 int regulator_bulk_disable(int num_consumers,
1823                            struct regulator_bulk_data *consumers)
1824 {
1825         int i;
1826         int ret;
1827
1828         for (i = 0; i < num_consumers; i++) {
1829                 ret = regulator_disable(consumers[i].consumer);
1830                 if (ret != 0)
1831                         goto err;
1832         }
1833
1834         return 0;
1835
1836 err:
1837         printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply);
1838         for (i = 0; i < num_consumers; i++)
1839                 regulator_enable(consumers[i].consumer);
1840
1841         return ret;
1842 }
1843 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
1844
1845 /**
1846  * regulator_bulk_free - free multiple regulator consumers
1847  *
1848  * @num_consumers: Number of consumers
1849  * @consumers:     Consumer data; clients are stored here.
1850  *
1851  * This convenience API allows consumers to free multiple regulator
1852  * clients in a single API call.
1853  */
1854 void regulator_bulk_free(int num_consumers,
1855                          struct regulator_bulk_data *consumers)
1856 {
1857         int i;
1858
1859         for (i = 0; i < num_consumers; i++) {
1860                 regulator_put(consumers[i].consumer);
1861                 consumers[i].consumer = NULL;
1862         }
1863 }
1864 EXPORT_SYMBOL_GPL(regulator_bulk_free);
1865
1866 /**
1867  * regulator_notifier_call_chain - call regulator event notifier
1868  * @rdev: regulator source
1869  * @event: notifier block
1870  * @data: callback-specific data.
1871  *
1872  * Called by regulator drivers to notify clients a regulator event has
1873  * occurred. We also notify regulator clients downstream.
1874  * Note lock must be held by caller.
1875  */
1876 int regulator_notifier_call_chain(struct regulator_dev *rdev,
1877                                   unsigned long event, void *data)
1878 {
1879         _notifier_call_chain(rdev, event, data);
1880         return NOTIFY_DONE;
1881
1882 }
1883 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
1884
1885 /*
1886  * To avoid cluttering sysfs (and memory) with useless state, only
1887  * create attributes that can be meaningfully displayed.
1888  */
1889 static int add_regulator_attributes(struct regulator_dev *rdev)
1890 {
1891         struct device           *dev = &rdev->dev;
1892         struct regulator_ops    *ops = rdev->desc->ops;
1893         int                     status = 0;
1894
1895         /* some attributes need specific methods to be displayed */
1896         if (ops->get_voltage) {
1897                 status = device_create_file(dev, &dev_attr_microvolts);
1898                 if (status < 0)
1899                         return status;
1900         }
1901         if (ops->get_current_limit) {
1902                 status = device_create_file(dev, &dev_attr_microamps);
1903                 if (status < 0)
1904                         return status;
1905         }
1906         if (ops->get_mode) {
1907                 status = device_create_file(dev, &dev_attr_opmode);
1908                 if (status < 0)
1909                         return status;
1910         }
1911         if (ops->is_enabled) {
1912                 status = device_create_file(dev, &dev_attr_state);
1913                 if (status < 0)
1914                         return status;
1915         }
1916         if (ops->get_status) {
1917                 status = device_create_file(dev, &dev_attr_status);
1918                 if (status < 0)
1919                         return status;
1920         }
1921
1922         /* some attributes are type-specific */
1923         if (rdev->desc->type == REGULATOR_CURRENT) {
1924                 status = device_create_file(dev, &dev_attr_requested_microamps);
1925                 if (status < 0)
1926                         return status;
1927         }
1928
1929         /* all the other attributes exist to support constraints;
1930          * don't show them if there are no constraints, or if the
1931          * relevant supporting methods are missing.
1932          */
1933         if (!rdev->constraints)
1934                 return status;
1935
1936         /* constraints need specific supporting methods */
1937         if (ops->set_voltage) {
1938                 status = device_create_file(dev, &dev_attr_min_microvolts);
1939                 if (status < 0)
1940                         return status;
1941                 status = device_create_file(dev, &dev_attr_max_microvolts);
1942                 if (status < 0)
1943                         return status;
1944         }
1945         if (ops->set_current_limit) {
1946                 status = device_create_file(dev, &dev_attr_min_microamps);
1947                 if (status < 0)
1948                         return status;
1949                 status = device_create_file(dev, &dev_attr_max_microamps);
1950                 if (status < 0)
1951                         return status;
1952         }
1953
1954         /* suspend mode constraints need multiple supporting methods */
1955         if (!(ops->set_suspend_enable && ops->set_suspend_disable))
1956                 return status;
1957
1958         status = device_create_file(dev, &dev_attr_suspend_standby_state);
1959         if (status < 0)
1960                 return status;
1961         status = device_create_file(dev, &dev_attr_suspend_mem_state);
1962         if (status < 0)
1963                 return status;
1964         status = device_create_file(dev, &dev_attr_suspend_disk_state);
1965         if (status < 0)
1966                 return status;
1967
1968         if (ops->set_suspend_voltage) {
1969                 status = device_create_file(dev,
1970                                 &dev_attr_suspend_standby_microvolts);
1971                 if (status < 0)
1972                         return status;
1973                 status = device_create_file(dev,
1974                                 &dev_attr_suspend_mem_microvolts);
1975                 if (status < 0)
1976                         return status;
1977                 status = device_create_file(dev,
1978                                 &dev_attr_suspend_disk_microvolts);
1979                 if (status < 0)
1980                         return status;
1981         }
1982
1983         if (ops->set_suspend_mode) {
1984                 status = device_create_file(dev,
1985                                 &dev_attr_suspend_standby_mode);
1986                 if (status < 0)
1987                         return status;
1988                 status = device_create_file(dev,
1989                                 &dev_attr_suspend_mem_mode);
1990                 if (status < 0)
1991                         return status;
1992                 status = device_create_file(dev,
1993                                 &dev_attr_suspend_disk_mode);
1994                 if (status < 0)
1995                         return status;
1996         }
1997
1998         return status;
1999 }
2000
2001 /**
2002  * regulator_register - register regulator
2003  * @regulator_desc: regulator to register
2004  * @dev: struct device for the regulator
2005  * @init_data: platform provided init data, passed through by driver
2006  * @driver_data: private regulator data
2007  *
2008  * Called by regulator drivers to register a regulator.
2009  * Returns 0 on success.
2010  */
2011 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2012         struct device *dev, struct regulator_init_data *init_data,
2013         void *driver_data)
2014 {
2015         static atomic_t regulator_no = ATOMIC_INIT(0);
2016         struct regulator_dev *rdev;
2017         int ret, i;
2018
2019         if (regulator_desc == NULL)
2020                 return ERR_PTR(-EINVAL);
2021
2022         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2023                 return ERR_PTR(-EINVAL);
2024
2025         if (!regulator_desc->type == REGULATOR_VOLTAGE &&
2026             !regulator_desc->type == REGULATOR_CURRENT)
2027                 return ERR_PTR(-EINVAL);
2028
2029         if (!init_data)
2030                 return ERR_PTR(-EINVAL);
2031
2032         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2033         if (rdev == NULL)
2034                 return ERR_PTR(-ENOMEM);
2035
2036         mutex_lock(&regulator_list_mutex);
2037
2038         mutex_init(&rdev->mutex);
2039         rdev->reg_data = driver_data;
2040         rdev->owner = regulator_desc->owner;
2041         rdev->desc = regulator_desc;
2042         INIT_LIST_HEAD(&rdev->consumer_list);
2043         INIT_LIST_HEAD(&rdev->supply_list);
2044         INIT_LIST_HEAD(&rdev->list);
2045         INIT_LIST_HEAD(&rdev->slist);
2046         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2047
2048         /* preform any regulator specific init */
2049         if (init_data->regulator_init) {
2050                 ret = init_data->regulator_init(rdev->reg_data);
2051                 if (ret < 0)
2052                         goto clean;
2053         }
2054
2055         /* register with sysfs */
2056         rdev->dev.class = &regulator_class;
2057         rdev->dev.parent = dev;
2058         dev_set_name(&rdev->dev, "regulator.%d",
2059                      atomic_inc_return(&regulator_no) - 1);
2060         ret = device_register(&rdev->dev);
2061         if (ret != 0)
2062                 goto clean;
2063
2064         dev_set_drvdata(&rdev->dev, rdev);
2065
2066         /* set regulator constraints */
2067         ret = set_machine_constraints(rdev, &init_data->constraints);
2068         if (ret < 0)
2069                 goto scrub;
2070
2071         /* add attributes supported by this regulator */
2072         ret = add_regulator_attributes(rdev);
2073         if (ret < 0)
2074                 goto scrub;
2075
2076         /* set supply regulator if it exists */
2077         if (init_data->supply_regulator_dev) {
2078                 ret = set_supply(rdev,
2079                         dev_get_drvdata(init_data->supply_regulator_dev));
2080                 if (ret < 0)
2081                         goto scrub;
2082         }
2083
2084         /* add consumers devices */
2085         for (i = 0; i < init_data->num_consumer_supplies; i++) {
2086                 ret = set_consumer_device_supply(rdev,
2087                         init_data->consumer_supplies[i].dev,
2088                         init_data->consumer_supplies[i].supply);
2089                 if (ret < 0) {
2090                         for (--i; i >= 0; i--)
2091                                 unset_consumer_device_supply(rdev,
2092                                         init_data->consumer_supplies[i].dev);
2093                         goto scrub;
2094                 }
2095         }
2096
2097         list_add(&rdev->list, &regulator_list);
2098 out:
2099         mutex_unlock(&regulator_list_mutex);
2100         return rdev;
2101
2102 scrub:
2103         device_unregister(&rdev->dev);
2104 clean:
2105         kfree(rdev);
2106         rdev = ERR_PTR(ret);
2107         goto out;
2108 }
2109 EXPORT_SYMBOL_GPL(regulator_register);
2110
2111 /**
2112  * regulator_unregister - unregister regulator
2113  * @rdev: regulator to unregister
2114  *
2115  * Called by regulator drivers to unregister a regulator.
2116  */
2117 void regulator_unregister(struct regulator_dev *rdev)
2118 {
2119         if (rdev == NULL)
2120                 return;
2121
2122         mutex_lock(&regulator_list_mutex);
2123         unset_regulator_supplies(rdev);
2124         list_del(&rdev->list);
2125         if (rdev->supply)
2126                 sysfs_remove_link(&rdev->dev.kobj, "supply");
2127         device_unregister(&rdev->dev);
2128         mutex_unlock(&regulator_list_mutex);
2129 }
2130 EXPORT_SYMBOL_GPL(regulator_unregister);
2131
2132 /**
2133  * regulator_suspend_prepare - prepare regulators for system wide suspend
2134  * @state: system suspend state
2135  *
2136  * Configure each regulator with it's suspend operating parameters for state.
2137  * This will usually be called by machine suspend code prior to supending.
2138  */
2139 int regulator_suspend_prepare(suspend_state_t state)
2140 {
2141         struct regulator_dev *rdev;
2142         int ret = 0;
2143
2144         /* ON is handled by regulator active state */
2145         if (state == PM_SUSPEND_ON)
2146                 return -EINVAL;
2147
2148         mutex_lock(&regulator_list_mutex);
2149         list_for_each_entry(rdev, &regulator_list, list) {
2150
2151                 mutex_lock(&rdev->mutex);
2152                 ret = suspend_prepare(rdev, state);
2153                 mutex_unlock(&rdev->mutex);
2154
2155                 if (ret < 0) {
2156                         printk(KERN_ERR "%s: failed to prepare %s\n",
2157                                 __func__, rdev->desc->name);
2158                         goto out;
2159                 }
2160         }
2161 out:
2162         mutex_unlock(&regulator_list_mutex);
2163         return ret;
2164 }
2165 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2166
2167 /**
2168  * rdev_get_drvdata - get rdev regulator driver data
2169  * @rdev: regulator
2170  *
2171  * Get rdev regulator driver private data. This call can be used in the
2172  * regulator driver context.
2173  */
2174 void *rdev_get_drvdata(struct regulator_dev *rdev)
2175 {
2176         return rdev->reg_data;
2177 }
2178 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2179
2180 /**
2181  * regulator_get_drvdata - get regulator driver data
2182  * @regulator: regulator
2183  *
2184  * Get regulator driver private data. This call can be used in the consumer
2185  * driver context when non API regulator specific functions need to be called.
2186  */
2187 void *regulator_get_drvdata(struct regulator *regulator)
2188 {
2189         return regulator->rdev->reg_data;
2190 }
2191 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2192
2193 /**
2194  * regulator_set_drvdata - set regulator driver data
2195  * @regulator: regulator
2196  * @data: data
2197  */
2198 void regulator_set_drvdata(struct regulator *regulator, void *data)
2199 {
2200         regulator->rdev->reg_data = data;
2201 }
2202 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2203
2204 /**
2205  * regulator_get_id - get regulator ID
2206  * @rdev: regulator
2207  */
2208 int rdev_get_id(struct regulator_dev *rdev)
2209 {
2210         return rdev->desc->id;
2211 }
2212 EXPORT_SYMBOL_GPL(rdev_get_id);
2213
2214 struct device *rdev_get_dev(struct regulator_dev *rdev)
2215 {
2216         return &rdev->dev;
2217 }
2218 EXPORT_SYMBOL_GPL(rdev_get_dev);
2219
2220 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2221 {
2222         return reg_init_data->driver_data;
2223 }
2224 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2225
2226 static int __init regulator_init(void)
2227 {
2228         printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
2229         return class_register(&regulator_class);
2230 }
2231
2232 /* init early to allow our consumers to complete system booting */
2233 core_initcall(regulator_init);