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