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         /* do we need to setup our suspend state */
 780         if (constraints->initial_state) {
 781                 ret = suspend_prepare(rdev, constraints->initial_state);
 782                 if (ret < 0) {
 783                         printk(KERN_ERR "%s: failed to set suspend state for %s\n",
 784                                __func__, name);
 785                         rdev->constraints = NULL;
 786                         goto out;
 787                 }
 788         }
 789
 790         if (constraints->initial_mode) {
 791                 if (!ops->set_mode) {
 792                         printk(KERN_ERR "%s: no set_mode operation for %s\n",
 793                                __func__, name);
 794                         ret = -EINVAL;
 795                         goto out;
 796                 }
 797
 798                 ret = ops->set_mode(rdev, constraints->initial_mode);
 799                 if (ret < 0) {
 800                         printk(KERN_ERR
 801                                "%s: failed to set initial mode for %s: %d\n",
 802                                __func__, name, ret);
 803                         goto out;
 804                 }
 805         }
 806
 807         /* If the constraints say the regulator should be on at this point
 808          * and we have control then make sure it is enabled.
 809          */
 810         if ((constraints->always_on || constraints->boot_on) && ops->enable) {
 811                 ret = ops->enable(rdev);
 812                 if (ret < 0) {
 813                         printk(KERN_ERR "%s: failed to enable %s\n",
 814                                __func__, name);
 815                         rdev->constraints = NULL;
 816                         goto out;
 817                 }
 818         }
 819
 820         print_constraints(rdev);
 821 out:
 822         return ret;
 823 }
 824
 825 /**
 826  * set_supply - set regulator supply regulator
 827  * @rdev: regulator name
 828  * @supply_rdev: supply regulator name
 829  *
 830  * Called by platform initialisation code to set the supply regulator for this
 831  * regulator. This ensures that a regulators supply will also be enabled by the
 832  * core if it's child is enabled.
 833  */
 834 static int set_supply(struct regulator_dev *rdev,
 835         struct regulator_dev *supply_rdev)
 836 {
 837         int err;
 838
 839         err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
 840                                 "supply");
 841         if (err) {
 842                 printk(KERN_ERR
 843                        "%s: could not add device link %s err %d\n",
 844                        __func__, supply_rdev->dev.kobj.name, err);
 845                        goto out;
 846         }
 847         rdev->supply = supply_rdev;
 848         list_add(&rdev->slist, &supply_rdev->supply_list);
 849 out:
 850         return err;
 851 }
 852
 853 /**
 854  * set_consumer_device_supply: Bind a regulator to a symbolic supply
 855  * @rdev:         regulator source
 856  * @consumer_dev: device the supply applies to
 857  * @supply:       symbolic name for supply
 858  *
 859  * Allows platform initialisation code to map physical regulator
 860  * sources to symbolic names for supplies for use by devices.  Devices
 861  * should use these symbolic names to request regulators, avoiding the
 862  * need to provide board-specific regulator names as platform data.
 863  */
 864 static int set_consumer_device_supply(struct regulator_dev *rdev,
 865         struct device *consumer_dev, const char *supply)
 866 {
 867         struct regulator_map *node;
 868
 869         if (supply == NULL)
 870                 return -EINVAL;
 871
 872         list_for_each_entry(node, &regulator_map_list, list) {
 873                 if (consumer_dev != node->dev)
 874                         continue;
 875                 if (strcmp(node->supply, supply) != 0)
 876                         continue;
 877
 878                 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
 879                                 dev_name(&node->regulator->dev),
 880                                 node->regulator->desc->name,
 881                                 supply,
 882                                 dev_name(&rdev->dev), rdev->desc->name);
 883                 return -EBUSY;
 884         }
 885
 886         node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
 887         if (node == NULL)
 888                 return -ENOMEM;
 889
 890         node->regulator = rdev;
 891         node->dev = consumer_dev;
 892         node->supply = supply;
 893
 894         list_add(&node->list, &regulator_map_list);
 895         return 0;
 896 }
 897
 898 static void unset_consumer_device_supply(struct regulator_dev *rdev,
 899         struct device *consumer_dev)
 900 {
 901         struct regulator_map *node, *n;
 902
 903         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 904                 if (rdev == node->regulator &&
 905                         consumer_dev == node->dev) {
 906                         list_del(&node->list);
 907                         kfree(node);
 908                         return;
 909                 }
 910         }
 911 }
 912
 913 static void unset_regulator_supplies(struct regulator_dev *rdev)
 914 {
 915         struct regulator_map *node, *n;
 916
 917         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 918                 if (rdev == node->regulator) {
 919                         list_del(&node->list);
 920                         kfree(node);
 921                         return;
 922                 }
 923         }
 924 }
 925
 926 #define REG_STR_SIZE    32
 927
 928 static struct regulator *create_regulator(struct regulator_dev *rdev,
 929                                           struct device *dev,
 930                                           const char *supply_name)
 931 {
 932         struct regulator *regulator;
 933         char buf[REG_STR_SIZE];
 934         int err, size;
 935
 936         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
 937         if (regulator == NULL)
 938                 return NULL;
 939
 940         mutex_lock(&rdev->mutex);
 941         regulator->rdev = rdev;
 942         list_add(&regulator->list, &rdev->consumer_list);
 943
 944         if (dev) {
 945                 /* create a 'requested_microamps_name' sysfs entry */
 946                 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
 947                         supply_name);
 948                 if (size >= REG_STR_SIZE)
 949                         goto overflow_err;
 950
 951                 regulator->dev = dev;
 952                 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
 953                 if (regulator->dev_attr.attr.name == NULL)
 954                         goto attr_name_err;
 955
 956                 regulator->dev_attr.attr.owner = THIS_MODULE;
 957                 regulator->dev_attr.attr.mode = 0444;
 958                 regulator->dev_attr.show = device_requested_uA_show;
 959                 err = device_create_file(dev, &regulator->dev_attr);
 960                 if (err < 0) {
 961                         printk(KERN_WARNING "%s: could not add regulator_dev"
 962                                 " load sysfs\n", __func__);
 963                         goto attr_name_err;
 964                 }
 965
 966                 /* also add a link to the device sysfs entry */
 967                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
 968                                  dev->kobj.name, supply_name);
 969                 if (size >= REG_STR_SIZE)
 970                         goto attr_err;
 971
 972                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
 973                 if (regulator->supply_name == NULL)
 974                         goto attr_err;
 975
 976                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
 977                                         buf);
 978                 if (err) {
 979                         printk(KERN_WARNING
 980                                "%s: could not add device link %s err %d\n",
 981                                __func__, dev->kobj.name, err);
 982                         device_remove_file(dev, &regulator->dev_attr);
 983                         goto link_name_err;
 984                 }
 985         }
 986         mutex_unlock(&rdev->mutex);
 987         return regulator;
 988 link_name_err:
 989         kfree(regulator->supply_name);
 990 attr_err:
 991         device_remove_file(regulator->dev, &regulator->dev_attr);
 992 attr_name_err:
 993         kfree(regulator->dev_attr.attr.name);
 994 overflow_err:
 995         list_del(&regulator->list);
 996         kfree(regulator);
 997         mutex_unlock(&rdev->mutex);
 998         return NULL;
 999 }
1000
1001 /**
1002  * regulator_get - lookup and obtain a reference to a regulator.
1003  * @dev: device for regulator "consumer"
1004  * @id: Supply name or regulator ID.
1005  *
1006  * Returns a struct regulator corresponding to the regulator producer,
1007  * or IS_ERR() condition containing errno.
1008  *
1009  * Use of supply names configured via regulator_set_device_supply() is
1010  * strongly encouraged.  It is recommended that the supply name used
1011  * should match the name used for the supply and/or the relevant
1012  * device pins in the datasheet.
1013  */
1014 struct regulator *regulator_get(struct device *dev, const char *id)
1015 {
1016         struct regulator_dev *rdev;
1017         struct regulator_map *map;
1018         struct regulator *regulator = ERR_PTR(-ENODEV);
1019
1020         if (id == NULL) {
1021                 printk(KERN_ERR "regulator: get() with no identifier\n");
1022                 return regulator;
1023         }
1024
1025         mutex_lock(&regulator_list_mutex);
1026
1027         list_for_each_entry(map, &regulator_map_list, list) {
1028                 if (dev == map->dev &&
1029                     strcmp(map->supply, id) == 0) {
1030                         rdev = map->regulator;
1031                         goto found;
1032                 }
1033         }
1034         mutex_unlock(&regulator_list_mutex);
1035         return regulator;
1036
1037 found:
1038         if (!try_module_get(rdev->owner))
1039                 goto out;
1040
1041         regulator = create_regulator(rdev, dev, id);
1042         if (regulator == NULL) {
1043                 regulator = ERR_PTR(-ENOMEM);
1044                 module_put(rdev->owner);
1045         }
1046
1047 out:
1048         mutex_unlock(&regulator_list_mutex);
1049         return regulator;
1050 }
1051 EXPORT_SYMBOL_GPL(regulator_get);
1052
1053 /**
1054  * regulator_put - "free" the regulator source
1055  * @regulator: regulator source
1056  *
1057  * Note: drivers must ensure that all regulator_enable calls made on this
1058  * regulator source are balanced by regulator_disable calls prior to calling
1059  * this function.
1060  */
1061 void regulator_put(struct regulator *regulator)
1062 {
1063         struct regulator_dev *rdev;
1064
1065         if (regulator == NULL || IS_ERR(regulator))
1066                 return;
1067
1068         mutex_lock(&regulator_list_mutex);
1069         rdev = regulator->rdev;
1070
1071         if (WARN(regulator->enabled, "Releasing supply %s while enabled\n",
1072                                regulator->supply_name))
1073                 _regulator_disable(rdev);
1074
1075         /* remove any sysfs entries */
1076         if (regulator->dev) {
1077                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1078                 kfree(regulator->supply_name);
1079                 device_remove_file(regulator->dev, &regulator->dev_attr);
1080                 kfree(regulator->dev_attr.attr.name);
1081         }
1082         list_del(&regulator->list);
1083         kfree(regulator);
1084
1085         module_put(rdev->owner);
1086         mutex_unlock(&regulator_list_mutex);
1087 }
1088 EXPORT_SYMBOL_GPL(regulator_put);
1089
1090 /* locks held by regulator_enable() */
1091 static int _regulator_enable(struct regulator_dev *rdev)
1092 {
1093         int ret = -EINVAL;
1094
1095         if (!rdev->constraints) {
1096                 printk(KERN_ERR "%s: %s has no constraints\n",
1097                        __func__, rdev->desc->name);
1098                 return ret;
1099         }
1100
1101         /* do we need to enable the supply regulator first */
1102         if (rdev->supply) {
1103                 ret = _regulator_enable(rdev->supply);
1104                 if (ret < 0) {
1105                         printk(KERN_ERR "%s: failed to enable %s: %d\n",
1106                                __func__, rdev->desc->name, ret);
1107                         return ret;
1108                 }
1109         }
1110
1111         /* check voltage and requested load before enabling */
1112         if (rdev->desc->ops->enable) {
1113
1114                 if (rdev->constraints &&
1115                         (rdev->constraints->valid_ops_mask &
1116                         REGULATOR_CHANGE_DRMS))
1117                         drms_uA_update(rdev);
1118
1119                 ret = rdev->desc->ops->enable(rdev);
1120                 if (ret < 0) {
1121                         printk(KERN_ERR "%s: failed to enable %s: %d\n",
1122                                __func__, rdev->desc->name, ret);
1123                         return ret;
1124                 }
1125                 rdev->use_count++;
1126                 return ret;
1127         }
1128
1129         return ret;
1130 }
1131
1132 /**
1133  * regulator_enable - enable regulator output
1134  * @regulator: regulator source
1135  *
1136  * Request that the regulator be enabled with the regulator output at
1137  * the predefined voltage or current value.  Calls to regulator_enable()
1138  * must be balanced with calls to regulator_disable().
1139  *
1140  * NOTE: the output value can be set by other drivers, boot loader or may be
1141  * hardwired in the regulator.
1142  */
1143 int regulator_enable(struct regulator *regulator)
1144 {
1145         struct regulator_dev *rdev = regulator->rdev;
1146         int ret = 0;
1147
1148         mutex_lock(&rdev->mutex);
1149         if (regulator->enabled == 0)
1150                 ret = _regulator_enable(rdev);
1151         else if (regulator->enabled < 0)
1152                 ret = -EIO;
1153         if (ret == 0)
1154                 regulator->enabled++;
1155         mutex_unlock(&rdev->mutex);
1156         return ret;
1157 }
1158 EXPORT_SYMBOL_GPL(regulator_enable);
1159
1160 /* locks held by regulator_disable() */
1161 static int _regulator_disable(struct regulator_dev *rdev)
1162 {
1163         int ret = 0;
1164
1165         /* are we the last user and permitted to disable ? */
1166         if (rdev->use_count == 1 && !rdev->constraints->always_on) {
1167
1168                 /* we are last user */
1169                 if (rdev->desc->ops->disable) {
1170                         ret = rdev->desc->ops->disable(rdev);
1171                         if (ret < 0) {
1172                                 printk(KERN_ERR "%s: failed to disable %s\n",
1173                                        __func__, rdev->desc->name);
1174                                 return ret;
1175                         }
1176                 }
1177
1178                 /* decrease our supplies ref count and disable if required */
1179                 if (rdev->supply)
1180                         _regulator_disable(rdev->supply);
1181
1182                 rdev->use_count = 0;
1183         } else if (rdev->use_count > 1) {
1184
1185                 if (rdev->constraints &&
1186                         (rdev->constraints->valid_ops_mask &
1187                         REGULATOR_CHANGE_DRMS))
1188                         drms_uA_update(rdev);
1189
1190                 rdev->use_count--;
1191         }
1192         return ret;
1193 }
1194
1195 /**
1196  * regulator_disable - disable regulator output
1197  * @regulator: regulator source
1198  *
1199  * Disable the regulator output voltage or current.  Calls to
1200  * regulator_enable() must be balanced with calls to
1201  * regulator_disable().
1202  *
1203  * NOTE: this will only disable the regulator output if no other consumer
1204  * devices have it enabled, the regulator device supports disabling and
1205  * machine constraints permit this operation.
1206  */
1207 int regulator_disable(struct regulator *regulator)
1208 {
1209         struct regulator_dev *rdev = regulator->rdev;
1210         int ret = 0;
1211
1212         mutex_lock(&rdev->mutex);
1213         if (regulator->enabled == 1) {
1214                 ret = _regulator_disable(rdev);
1215                 if (ret == 0)
1216                         regulator->uA_load = 0;
1217         } else if (WARN(regulator->enabled <= 0,
1218                         "unbalanced disables for supply %s\n",
1219                         regulator->supply_name))
1220                 ret = -EIO;
1221         if (ret == 0)
1222                 regulator->enabled--;
1223         mutex_unlock(&rdev->mutex);
1224         return ret;
1225 }
1226 EXPORT_SYMBOL_GPL(regulator_disable);
1227
1228 /* locks held by regulator_force_disable() */
1229 static int _regulator_force_disable(struct regulator_dev *rdev)
1230 {
1231         int ret = 0;
1232
1233         /* force disable */
1234         if (rdev->desc->ops->disable) {
1235                 /* ah well, who wants to live forever... */
1236                 ret = rdev->desc->ops->disable(rdev);
1237                 if (ret < 0) {
1238                         printk(KERN_ERR "%s: failed to force disable %s\n",
1239                                __func__, rdev->desc->name);
1240                         return ret;
1241                 }
1242                 /* notify other consumers that power has been forced off */
1243                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
1244                         NULL);
1245         }
1246
1247         /* decrease our supplies ref count and disable if required */
1248         if (rdev->supply)
1249                 _regulator_disable(rdev->supply);
1250
1251         rdev->use_count = 0;
1252         return ret;
1253 }
1254
1255 /**
1256  * regulator_force_disable - force disable regulator output
1257  * @regulator: regulator source
1258  *
1259  * Forcibly disable the regulator output voltage or current.
1260  * NOTE: this *will* disable the regulator output even if other consumer
1261  * devices have it enabled. This should be used for situations when device
1262  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1263  */
1264 int regulator_force_disable(struct regulator *regulator)
1265 {
1266         int ret;
1267
1268         mutex_lock(&regulator->rdev->mutex);
1269         regulator->enabled = 0;
1270         regulator->uA_load = 0;
1271         ret = _regulator_force_disable(regulator->rdev);
1272         mutex_unlock(&regulator->rdev->mutex);
1273         return ret;
1274 }
1275 EXPORT_SYMBOL_GPL(regulator_force_disable);
1276
1277 static int _regulator_is_enabled(struct regulator_dev *rdev)
1278 {
1279         int ret;
1280
1281         mutex_lock(&rdev->mutex);
1282
1283         /* sanity check */
1284         if (!rdev->desc->ops->is_enabled) {
1285                 ret = -EINVAL;
1286                 goto out;
1287         }
1288
1289         ret = rdev->desc->ops->is_enabled(rdev);
1290 out:
1291         mutex_unlock(&rdev->mutex);
1292         return ret;
1293 }
1294
1295 /**
1296  * regulator_is_enabled - is the regulator output enabled
1297  * @regulator: regulator source
1298  *
1299  * Returns positive if the regulator driver backing the source/client
1300  * has requested that the device be enabled, zero if it hasn't, else a
1301  * negative errno code.
1302  *
1303  * Note that the device backing this regulator handle can have multiple
1304  * users, so it might be enabled even if regulator_enable() was never
1305  * called for this particular source.
1306  */
1307 int regulator_is_enabled(struct regulator *regulator)
1308 {
1309         return _regulator_is_enabled(regulator->rdev);
1310 }
1311 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1312
1313 /**
1314  * regulator_count_voltages - count regulator_list_voltage() selectors
1315  * @regulator: regulator source
1316  *
1317  * Returns number of selectors, or negative errno.  Selectors are
1318  * numbered starting at zero, and typically correspond to bitfields
1319  * in hardware registers.
1320  */
1321 int regulator_count_voltages(struct regulator *regulator)
1322 {
1323         struct regulator_dev    *rdev = regulator->rdev;
1324
1325         return rdev->desc->n_voltages ? : -EINVAL;
1326 }
1327 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1328
1329 /**
1330  * regulator_list_voltage - enumerate supported voltages
1331  * @regulator: regulator source
1332  * @selector: identify voltage to list
1333  * Context: can sleep
1334  *
1335  * Returns a voltage that can be passed to @regulator_set_voltage(),
1336  * zero if this selector code can't be used on this sytem, or a
1337  * negative errno.
1338  */
1339 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1340 {
1341         struct regulator_dev    *rdev = regulator->rdev;
1342         struct regulator_ops    *ops = rdev->desc->ops;
1343         int                     ret;
1344
1345         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1346                 return -EINVAL;
1347
1348         mutex_lock(&rdev->mutex);
1349         ret = ops->list_voltage(rdev, selector);
1350         mutex_unlock(&rdev->mutex);
1351
1352         if (ret > 0) {
1353                 if (ret < rdev->constraints->min_uV)
1354                         ret = 0;
1355                 else if (ret > rdev->constraints->max_uV)
1356                         ret = 0;
1357         }
1358
1359         return ret;
1360 }
1361 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1362
1363 /**
1364  * regulator_set_voltage - set regulator output voltage
1365  * @regulator: regulator source
1366  * @min_uV: Minimum required voltage in uV
1367  * @max_uV: Maximum acceptable voltage in uV
1368  *
1369  * Sets a voltage regulator to the desired output voltage. This can be set
1370  * during any regulator state. IOW, regulator can be disabled or enabled.
1371  *
1372  * If the regulator is enabled then the voltage will change to the new value
1373  * immediately otherwise if the regulator is disabled the regulator will
1374  * output at the new voltage when enabled.
1375  *
1376  * NOTE: If the regulator is shared between several devices then the lowest
1377  * request voltage that meets the system constraints will be used.
1378  * Regulator system constraints must be set for this regulator before
1379  * calling this function otherwise this call will fail.
1380  */
1381 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1382 {
1383         struct regulator_dev *rdev = regulator->rdev;
1384         int ret;
1385
1386         mutex_lock(&rdev->mutex);
1387
1388         /* sanity check */
1389         if (!rdev->desc->ops->set_voltage) {
1390                 ret = -EINVAL;
1391                 goto out;
1392         }
1393
1394         /* constraints check */
1395         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1396         if (ret < 0)
1397                 goto out;
1398         regulator->min_uV = min_uV;
1399         regulator->max_uV = max_uV;
1400         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1401
1402 out:
1403         _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
1404         mutex_unlock(&rdev->mutex);
1405         return ret;
1406 }
1407 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1408
1409 static int _regulator_get_voltage(struct regulator_dev *rdev)
1410 {
1411         /* sanity check */
1412         if (rdev->desc->ops->get_voltage)
1413                 return rdev->desc->ops->get_voltage(rdev);
1414         else
1415                 return -EINVAL;
1416 }
1417
1418 /**
1419  * regulator_get_voltage - get regulator output voltage
1420  * @regulator: regulator source
1421  *
1422  * This returns the current regulator voltage in uV.
1423  *
1424  * NOTE: If the regulator is disabled it will return the voltage value. This
1425  * function should not be used to determine regulator state.
1426  */
1427 int regulator_get_voltage(struct regulator *regulator)
1428 {
1429         int ret;
1430
1431         mutex_lock(&regulator->rdev->mutex);
1432
1433         ret = _regulator_get_voltage(regulator->rdev);
1434
1435         mutex_unlock(&regulator->rdev->mutex);
1436
1437         return ret;
1438 }
1439 EXPORT_SYMBOL_GPL(regulator_get_voltage);
1440
1441 /**
1442  * regulator_set_current_limit - set regulator output current limit
1443  * @regulator: regulator source
1444  * @min_uA: Minimuum supported current in uA
1445  * @max_uA: Maximum supported current in uA
1446  *
1447  * Sets current sink to the desired output current. This can be set during
1448  * any regulator state. IOW, regulator can be disabled or enabled.
1449  *
1450  * If the regulator is enabled then the current will change to the new value
1451  * immediately otherwise if the regulator is disabled the regulator will
1452  * output at the new current when enabled.
1453  *
1454  * NOTE: Regulator system constraints must be set for this regulator before
1455  * calling this function otherwise this call will fail.
1456  */
1457 int regulator_set_current_limit(struct regulator *regulator,
1458                                int min_uA, int max_uA)
1459 {
1460         struct regulator_dev *rdev = regulator->rdev;
1461         int ret;
1462
1463         mutex_lock(&rdev->mutex);
1464
1465         /* sanity check */
1466         if (!rdev->desc->ops->set_current_limit) {
1467                 ret = -EINVAL;
1468                 goto out;
1469         }
1470
1471         /* constraints check */
1472         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1473         if (ret < 0)
1474                 goto out;
1475
1476         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1477 out:
1478         mutex_unlock(&rdev->mutex);
1479         return ret;
1480 }
1481 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1482
1483 static int _regulator_get_current_limit(struct regulator_dev *rdev)
1484 {
1485         int ret;
1486
1487         mutex_lock(&rdev->mutex);
1488
1489         /* sanity check */
1490         if (!rdev->desc->ops->get_current_limit) {
1491                 ret = -EINVAL;
1492                 goto out;
1493         }
1494
1495         ret = rdev->desc->ops->get_current_limit(rdev);
1496 out:
1497         mutex_unlock(&rdev->mutex);
1498         return ret;
1499 }
1500
1501 /**
1502  * regulator_get_current_limit - get regulator output current
1503  * @regulator: regulator source
1504  *
1505  * This returns the current supplied by the specified current sink in uA.
1506  *
1507  * NOTE: If the regulator is disabled it will return the current value. This
1508  * function should not be used to determine regulator state.
1509  */
1510 int regulator_get_current_limit(struct regulator *regulator)
1511 {
1512         return _regulator_get_current_limit(regulator->rdev);
1513 }
1514 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1515
1516 /**
1517  * regulator_set_mode - set regulator operating mode
1518  * @regulator: regulator source
1519  * @mode: operating mode - one of the REGULATOR_MODE constants
1520  *
1521  * Set regulator operating mode to increase regulator efficiency or improve
1522  * regulation performance.
1523  *
1524  * NOTE: Regulator system constraints must be set for this regulator before
1525  * calling this function otherwise this call will fail.
1526  */
1527 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1528 {
1529         struct regulator_dev *rdev = regulator->rdev;
1530         int ret;
1531
1532         mutex_lock(&rdev->mutex);
1533
1534         /* sanity check */
1535         if (!rdev->desc->ops->set_mode) {
1536                 ret = -EINVAL;
1537                 goto out;
1538         }
1539
1540         /* constraints check */
1541         ret = regulator_check_mode(rdev, mode);
1542         if (ret < 0)
1543                 goto out;
1544
1545         ret = rdev->desc->ops->set_mode(rdev, mode);
1546 out:
1547         mutex_unlock(&rdev->mutex);
1548         return ret;
1549 }
1550 EXPORT_SYMBOL_GPL(regulator_set_mode);
1551
1552 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1553 {
1554         int ret;
1555
1556         mutex_lock(&rdev->mutex);
1557
1558         /* sanity check */
1559         if (!rdev->desc->ops->get_mode) {
1560                 ret = -EINVAL;
1561                 goto out;
1562         }
1563
1564         ret = rdev->desc->ops->get_mode(rdev);
1565 out:
1566         mutex_unlock(&rdev->mutex);
1567         return ret;
1568 }
1569
1570 /**
1571  * regulator_get_mode - get regulator operating mode
1572  * @regulator: regulator source
1573  *
1574  * Get the current regulator operating mode.
1575  */
1576 unsigned int regulator_get_mode(struct regulator *regulator)
1577 {
1578         return _regulator_get_mode(regulator->rdev);
1579 }
1580 EXPORT_SYMBOL_GPL(regulator_get_mode);
1581
1582 /**
1583  * regulator_set_optimum_mode - set regulator optimum operating mode
1584  * @regulator: regulator source
1585  * @uA_load: load current
1586  *
1587  * Notifies the regulator core of a new device load. This is then used by
1588  * DRMS (if enabled by constraints) to set the most efficient regulator
1589  * operating mode for the new regulator loading.
1590  *
1591  * Consumer devices notify their supply regulator of the maximum power
1592  * they will require (can be taken from device datasheet in the power
1593  * consumption tables) when they change operational status and hence power
1594  * state. Examples of operational state changes that can affect power
1595  * consumption are :-
1596  *
1597  *    o Device is opened / closed.
1598  *    o Device I/O is about to begin or has just finished.
1599  *    o Device is idling in between work.
1600  *
1601  * This information is also exported via sysfs to userspace.
1602  *
1603  * DRMS will sum the total requested load on the regulator and change
1604  * to the most efficient operating mode if platform constraints allow.
1605  *
1606  * Returns the new regulator mode or error.
1607  */
1608 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1609 {
1610         struct regulator_dev *rdev = regulator->rdev;
1611         struct regulator *consumer;
1612         int ret, output_uV, input_uV, total_uA_load = 0;
1613         unsigned int mode;
1614
1615         mutex_lock(&rdev->mutex);
1616
1617         regulator->uA_load = uA_load;
1618         ret = regulator_check_drms(rdev);
1619         if (ret < 0)
1620                 goto out;
1621         ret = -EINVAL;
1622
1623         /* sanity check */
1624         if (!rdev->desc->ops->get_optimum_mode)
1625                 goto out;
1626
1627         /* get output voltage */
1628         output_uV = rdev->desc->ops->get_voltage(rdev);
1629         if (output_uV <= 0) {
1630                 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1631                         __func__, rdev->desc->name);
1632                 goto out;
1633         }
1634
1635         /* get input voltage */
1636         if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1637                 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1638         else
1639                 input_uV = rdev->constraints->input_uV;
1640         if (input_uV <= 0) {
1641                 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1642                         __func__, rdev->desc->name);
1643                 goto out;
1644         }
1645
1646         /* calc total requested load for this regulator */
1647         list_for_each_entry(consumer, &rdev->consumer_list, list)
1648             total_uA_load += consumer->uA_load;
1649
1650         mode = rdev->desc->ops->get_optimum_mode(rdev,
1651                                                  input_uV, output_uV,
1652                                                  total_uA_load);
1653         ret = regulator_check_mode(rdev, mode);
1654         if (ret < 0) {
1655                 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1656                         " %d uA %d -> %d uV\n", __func__, rdev->desc->name,
1657                         total_uA_load, input_uV, output_uV);
1658                 goto out;
1659         }
1660
1661         ret = rdev->desc->ops->set_mode(rdev, mode);
1662         if (ret < 0) {
1663                 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1664                         __func__, mode, rdev->desc->name);
1665                 goto out;
1666         }
1667         ret = mode;
1668 out:
1669         mutex_unlock(&rdev->mutex);
1670         return ret;
1671 }
1672 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1673
1674 /**
1675  * regulator_register_notifier - register regulator event notifier
1676  * @regulator: regulator source
1677  * @nb: notifier block
1678  *
1679  * Register notifier block to receive regulator events.
1680  */
1681 int regulator_register_notifier(struct regulator *regulator,
1682                               struct notifier_block *nb)
1683 {
1684         return blocking_notifier_chain_register(&regulator->rdev->notifier,
1685                                                 nb);
1686 }
1687 EXPORT_SYMBOL_GPL(regulator_register_notifier);
1688
1689 /**
1690  * regulator_unregister_notifier - unregister regulator event notifier
1691  * @regulator: regulator source
1692  * @nb: notifier block
1693  *
1694  * Unregister regulator event notifier block.
1695  */
1696 int regulator_unregister_notifier(struct regulator *regulator,
1697                                 struct notifier_block *nb)
1698 {
1699         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1700                                                   nb);
1701 }
1702 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1703
1704 /* notify regulator consumers and downstream regulator consumers.
1705  * Note mutex must be held by caller.
1706  */
1707 static void _notifier_call_chain(struct regulator_dev *rdev,
1708                                   unsigned long event, void *data)
1709 {
1710         struct regulator_dev *_rdev;
1711
1712         /* call rdev chain first */
1713         blocking_notifier_call_chain(&rdev->notifier, event, NULL);
1714
1715         /* now notify regulator we supply */
1716         list_for_each_entry(_rdev, &rdev->supply_list, slist) {
1717           mutex_lock(&_rdev->mutex);
1718           _notifier_call_chain(_rdev, event, data);
1719           mutex_unlock(&_rdev->mutex);
1720         }
1721 }
1722
1723 /**
1724  * regulator_bulk_get - get multiple regulator consumers
1725  *
1726  * @dev:           Device to supply
1727  * @num_consumers: Number of consumers to register
1728  * @consumers:     Configuration of consumers; clients are stored here.
1729  *
1730  * @return 0 on success, an errno on failure.
1731  *
1732  * This helper function allows drivers to get several regulator
1733  * consumers in one operation.  If any of the regulators cannot be
1734  * acquired then any regulators that were allocated will be freed
1735  * before returning to the caller.
1736  */
1737 int regulator_bulk_get(struct device *dev, int num_consumers,
1738                        struct regulator_bulk_data *consumers)
1739 {
1740         int i;
1741         int ret;
1742
1743         for (i = 0; i < num_consumers; i++)
1744                 consumers[i].consumer = NULL;
1745
1746         for (i = 0; i < num_consumers; i++) {
1747                 consumers[i].consumer = regulator_get(dev,
1748                                                       consumers[i].supply);
1749                 if (IS_ERR(consumers[i].consumer)) {
1750                         dev_err(dev, "Failed to get supply '%s'\n",
1751                                 consumers[i].supply);
1752                         ret = PTR_ERR(consumers[i].consumer);
1753                         consumers[i].consumer = NULL;
1754                         goto err;
1755                 }
1756         }
1757
1758         return 0;
1759
1760 err:
1761         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1762                 regulator_put(consumers[i].consumer);
1763
1764         return ret;
1765 }
1766 EXPORT_SYMBOL_GPL(regulator_bulk_get);
1767
1768 /**
1769  * regulator_bulk_enable - enable multiple regulator consumers
1770  *
1771  * @num_consumers: Number of consumers
1772  * @consumers:     Consumer data; clients are stored here.
1773  * @return         0 on success, an errno on failure
1774  *
1775  * This convenience API allows consumers to enable multiple regulator
1776  * clients in a single API call.  If any consumers cannot be enabled
1777  * then any others that were enabled will be disabled again prior to
1778  * return.
1779  */
1780 int regulator_bulk_enable(int num_consumers,
1781                           struct regulator_bulk_data *consumers)
1782 {
1783         int i;
1784         int ret;
1785
1786         for (i = 0; i < num_consumers; i++) {
1787                 ret = regulator_enable(consumers[i].consumer);
1788                 if (ret != 0)
1789                         goto err;
1790         }
1791
1792         return 0;
1793
1794 err:
1795         printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply);
1796         for (i = 0; i < num_consumers; i++)
1797                 regulator_disable(consumers[i].consumer);
1798
1799         return ret;
1800 }
1801 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
1802
1803 /**
1804  * regulator_bulk_disable - disable multiple regulator consumers
1805  *
1806  * @num_consumers: Number of consumers
1807  * @consumers:     Consumer data; clients are stored here.
1808  * @return         0 on success, an errno on failure
1809  *
1810  * This convenience API allows consumers to disable multiple regulator
1811  * clients in a single API call.  If any consumers cannot be enabled
1812  * then any others that were disabled will be disabled again prior to
1813  * return.
1814  */
1815 int regulator_bulk_disable(int num_consumers,
1816                            struct regulator_bulk_data *consumers)
1817 {
1818         int i;
1819         int ret;
1820
1821         for (i = 0; i < num_consumers; i++) {
1822                 ret = regulator_disable(consumers[i].consumer);
1823                 if (ret != 0)
1824                         goto err;
1825         }
1826
1827         return 0;
1828
1829 err:
1830         printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply);
1831         for (i = 0; i < num_consumers; i++)
1832                 regulator_enable(consumers[i].consumer);
1833
1834         return ret;
1835 }
1836 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
1837
1838 /**
1839  * regulator_bulk_free - free multiple regulator consumers
1840  *
1841  * @num_consumers: Number of consumers
1842  * @consumers:     Consumer data; clients are stored here.
1843  *
1844  * This convenience API allows consumers to free multiple regulator
1845  * clients in a single API call.
1846  */
1847 void regulator_bulk_free(int num_consumers,
1848                          struct regulator_bulk_data *consumers)
1849 {
1850         int i;
1851
1852         for (i = 0; i < num_consumers; i++) {
1853                 regulator_put(consumers[i].consumer);
1854                 consumers[i].consumer = NULL;
1855         }
1856 }
1857 EXPORT_SYMBOL_GPL(regulator_bulk_free);
1858
1859 /**
1860  * regulator_notifier_call_chain - call regulator event notifier
1861  * @rdev: regulator source
1862  * @event: notifier block
1863  * @data: callback-specific data.
1864  *
1865  * Called by regulator drivers to notify clients a regulator event has
1866  * occurred. We also notify regulator clients downstream.
1867  * Note lock must be held by caller.
1868  */
1869 int regulator_notifier_call_chain(struct regulator_dev *rdev,
1870                                   unsigned long event, void *data)
1871 {
1872         _notifier_call_chain(rdev, event, data);
1873         return NOTIFY_DONE;
1874
1875 }
1876 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
1877
1878 /*
1879  * To avoid cluttering sysfs (and memory) with useless state, only
1880  * create attributes that can be meaningfully displayed.
1881  */
1882 static int add_regulator_attributes(struct regulator_dev *rdev)
1883 {
1884         struct device           *dev = &rdev->dev;
1885         struct regulator_ops    *ops = rdev->desc->ops;
1886         int                     status = 0;
1887
1888         /* some attributes need specific methods to be displayed */
1889         if (ops->get_voltage) {
1890                 status = device_create_file(dev, &dev_attr_microvolts);
1891                 if (status < 0)
1892                         return status;
1893         }
1894         if (ops->get_current_limit) {
1895                 status = device_create_file(dev, &dev_attr_microamps);
1896                 if (status < 0)
1897                         return status;
1898         }
1899         if (ops->get_mode) {
1900                 status = device_create_file(dev, &dev_attr_opmode);
1901                 if (status < 0)
1902                         return status;
1903         }
1904         if (ops->is_enabled) {
1905                 status = device_create_file(dev, &dev_attr_state);
1906                 if (status < 0)
1907                         return status;
1908         }
1909         if (ops->get_status) {
1910                 status = device_create_file(dev, &dev_attr_status);
1911                 if (status < 0)
1912                         return status;
1913         }
1914
1915         /* some attributes are type-specific */
1916         if (rdev->desc->type == REGULATOR_CURRENT) {
1917                 status = device_create_file(dev, &dev_attr_requested_microamps);
1918                 if (status < 0)
1919                         return status;
1920         }
1921
1922         /* all the other attributes exist to support constraints;
1923          * don't show them if there are no constraints, or if the
1924          * relevant supporting methods are missing.
1925          */
1926         if (!rdev->constraints)
1927                 return status;
1928
1929         /* constraints need specific supporting methods */
1930         if (ops->set_voltage) {
1931                 status = device_create_file(dev, &dev_attr_min_microvolts);
1932                 if (status < 0)
1933                         return status;
1934                 status = device_create_file(dev, &dev_attr_max_microvolts);
1935                 if (status < 0)
1936                         return status;
1937         }
1938         if (ops->set_current_limit) {
1939                 status = device_create_file(dev, &dev_attr_min_microamps);
1940                 if (status < 0)
1941                         return status;
1942                 status = device_create_file(dev, &dev_attr_max_microamps);
1943                 if (status < 0)
1944                         return status;
1945         }
1946
1947         /* suspend mode constraints need multiple supporting methods */
1948         if (!(ops->set_suspend_enable && ops->set_suspend_disable))
1949                 return status;
1950
1951         status = device_create_file(dev, &dev_attr_suspend_standby_state);
1952         if (status < 0)
1953                 return status;
1954         status = device_create_file(dev, &dev_attr_suspend_mem_state);
1955         if (status < 0)
1956                 return status;
1957         status = device_create_file(dev, &dev_attr_suspend_disk_state);
1958         if (status < 0)
1959                 return status;
1960
1961         if (ops->set_suspend_voltage) {
1962                 status = device_create_file(dev,
1963                                 &dev_attr_suspend_standby_microvolts);
1964                 if (status < 0)
1965                         return status;
1966                 status = device_create_file(dev,
1967                                 &dev_attr_suspend_mem_microvolts);
1968                 if (status < 0)
1969                         return status;
1970                 status = device_create_file(dev,
1971                                 &dev_attr_suspend_disk_microvolts);
1972                 if (status < 0)
1973                         return status;
1974         }
1975
1976         if (ops->set_suspend_mode) {
1977                 status = device_create_file(dev,
1978                                 &dev_attr_suspend_standby_mode);
1979                 if (status < 0)
1980                         return status;
1981                 status = device_create_file(dev,
1982                                 &dev_attr_suspend_mem_mode);
1983                 if (status < 0)
1984                         return status;
1985                 status = device_create_file(dev,
1986                                 &dev_attr_suspend_disk_mode);
1987                 if (status < 0)
1988                         return status;
1989         }
1990
1991         return status;
1992 }
1993
1994 /**
1995  * regulator_register - register regulator
1996  * @regulator_desc: regulator to register
1997  * @dev: struct device for the regulator
1998  * @init_data: platform provided init data, passed through by driver
1999  * @driver_data: private regulator data
2000  *
2001  * Called by regulator drivers to register a regulator.
2002  * Returns 0 on success.
2003  */
2004 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2005         struct device *dev, struct regulator_init_data *init_data,
2006         void *driver_data)
2007 {
2008         static atomic_t regulator_no = ATOMIC_INIT(0);
2009         struct regulator_dev *rdev;
2010         int ret, i;
2011
2012         if (regulator_desc == NULL)
2013                 return ERR_PTR(-EINVAL);
2014
2015         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2016                 return ERR_PTR(-EINVAL);
2017
2018         if (!regulator_desc->type == REGULATOR_VOLTAGE &&
2019             !regulator_desc->type == REGULATOR_CURRENT)
2020                 return ERR_PTR(-EINVAL);
2021
2022         if (!init_data)
2023                 return ERR_PTR(-EINVAL);
2024
2025         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2026         if (rdev == NULL)
2027                 return ERR_PTR(-ENOMEM);
2028
2029         mutex_lock(&regulator_list_mutex);
2030
2031         mutex_init(&rdev->mutex);
2032         rdev->reg_data = driver_data;
2033         rdev->owner = regulator_desc->owner;
2034         rdev->desc = regulator_desc;
2035         INIT_LIST_HEAD(&rdev->consumer_list);
2036         INIT_LIST_HEAD(&rdev->supply_list);
2037         INIT_LIST_HEAD(&rdev->list);
2038         INIT_LIST_HEAD(&rdev->slist);
2039         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2040
2041         /* preform any regulator specific init */
2042         if (init_data->regulator_init) {
2043                 ret = init_data->regulator_init(rdev->reg_data);
2044                 if (ret < 0)
2045                         goto clean;
2046         }
2047
2048         /* register with sysfs */
2049         rdev->dev.class = &regulator_class;
2050         rdev->dev.parent = dev;
2051         dev_set_name(&rdev->dev, "regulator.%d",
2052                      atomic_inc_return(&regulator_no) - 1);
2053         ret = device_register(&rdev->dev);
2054         if (ret != 0)
2055                 goto clean;
2056
2057         dev_set_drvdata(&rdev->dev, rdev);
2058
2059         /* set regulator constraints */
2060         ret = set_machine_constraints(rdev, &init_data->constraints);
2061         if (ret < 0)
2062                 goto scrub;
2063
2064         /* add attributes supported by this regulator */
2065         ret = add_regulator_attributes(rdev);
2066         if (ret < 0)
2067                 goto scrub;
2068
2069         /* set supply regulator if it exists */
2070         if (init_data->supply_regulator_dev) {
2071                 ret = set_supply(rdev,
2072                         dev_get_drvdata(init_data->supply_regulator_dev));
2073                 if (ret < 0)
2074                         goto scrub;
2075         }
2076
2077         /* add consumers devices */
2078         for (i = 0; i < init_data->num_consumer_supplies; i++) {
2079                 ret = set_consumer_device_supply(rdev,
2080                         init_data->consumer_supplies[i].dev,
2081                         init_data->consumer_supplies[i].supply);
2082                 if (ret < 0) {
2083                         for (--i; i >= 0; i--)
2084                                 unset_consumer_device_supply(rdev,
2085                                         init_data->consumer_supplies[i].dev);
2086                         goto scrub;
2087                 }
2088         }
2089
2090         list_add(&rdev->list, &regulator_list);
2091 out:
2092         mutex_unlock(&regulator_list_mutex);
2093         return rdev;
2094
2095 scrub:
2096         device_unregister(&rdev->dev);
2097 clean:
2098         kfree(rdev);
2099         rdev = ERR_PTR(ret);
2100         goto out;
2101 }
2102 EXPORT_SYMBOL_GPL(regulator_register);
2103
2104 /**
2105  * regulator_unregister - unregister regulator
2106  * @rdev: regulator to unregister
2107  *
2108  * Called by regulator drivers to unregister a regulator.
2109  */
2110 void regulator_unregister(struct regulator_dev *rdev)
2111 {
2112         if (rdev == NULL)
2113                 return;
2114
2115         mutex_lock(&regulator_list_mutex);
2116         unset_regulator_supplies(rdev);
2117         list_del(&rdev->list);
2118         if (rdev->supply)
2119                 sysfs_remove_link(&rdev->dev.kobj, "supply");
2120         device_unregister(&rdev->dev);
2121         mutex_unlock(&regulator_list_mutex);
2122 }
2123 EXPORT_SYMBOL_GPL(regulator_unregister);
2124
2125 /**
2126  * regulator_suspend_prepare - prepare regulators for system wide suspend
2127  * @state: system suspend state
2128  *
2129  * Configure each regulator with it's suspend operating parameters for state.
2130  * This will usually be called by machine suspend code prior to supending.
2131  */
2132 int regulator_suspend_prepare(suspend_state_t state)
2133 {
2134         struct regulator_dev *rdev;
2135         int ret = 0;
2136
2137         /* ON is handled by regulator active state */
2138         if (state == PM_SUSPEND_ON)
2139                 return -EINVAL;
2140
2141         mutex_lock(&regulator_list_mutex);
2142         list_for_each_entry(rdev, &regulator_list, list) {
2143
2144                 mutex_lock(&rdev->mutex);
2145                 ret = suspend_prepare(rdev, state);
2146                 mutex_unlock(&rdev->mutex);
2147
2148                 if (ret < 0) {
2149                         printk(KERN_ERR "%s: failed to prepare %s\n",
2150                                 __func__, rdev->desc->name);
2151                         goto out;
2152                 }
2153         }
2154 out:
2155         mutex_unlock(&regulator_list_mutex);
2156         return ret;
2157 }
2158 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2159
2160 /**
2161  * rdev_get_drvdata - get rdev regulator driver data
2162  * @rdev: regulator
2163  *
2164  * Get rdev regulator driver private data. This call can be used in the
2165  * regulator driver context.
2166  */
2167 void *rdev_get_drvdata(struct regulator_dev *rdev)
2168 {
2169         return rdev->reg_data;
2170 }
2171 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2172
2173 /**
2174  * regulator_get_drvdata - get regulator driver data
2175  * @regulator: regulator
2176  *
2177  * Get regulator driver private data. This call can be used in the consumer
2178  * driver context when non API regulator specific functions need to be called.
2179  */
2180 void *regulator_get_drvdata(struct regulator *regulator)
2181 {
2182         return regulator->rdev->reg_data;
2183 }
2184 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2185
2186 /**
2187  * regulator_set_drvdata - set regulator driver data
2188  * @regulator: regulator
2189  * @data: data
2190  */
2191 void regulator_set_drvdata(struct regulator *regulator, void *data)
2192 {
2193         regulator->rdev->reg_data = data;
2194 }
2195 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2196
2197 /**
2198  * regulator_get_id - get regulator ID
2199  * @rdev: regulator
2200  */
2201 int rdev_get_id(struct regulator_dev *rdev)
2202 {
2203         return rdev->desc->id;
2204 }
2205 EXPORT_SYMBOL_GPL(rdev_get_id);
2206
2207 struct device *rdev_get_dev(struct regulator_dev *rdev)
2208 {
2209         return &rdev->dev;
2210 }
2211 EXPORT_SYMBOL_GPL(rdev_get_dev);
2212
2213 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2214 {
2215         return reg_init_data->driver_data;
2216 }
2217 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2218
2219 static int __init regulator_init(void)
2220 {
2221         printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
2222         return class_register(&regulator_class);
2223 }
2224
2225 /* init early to allow our consumers to complete system booting */
2226 core_initcall(regulator_init);