SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 static int has_full_constraints;
  32
  33 /*
  34  * struct regulator_map
  35  *
  36  * Used to provide symbolic supply names to devices.
  37  */
  38 struct regulator_map {
  39         struct list_head list;
  40         const char *dev_name;   /* The dev_name() for the consumer */
  41         const char *supply;
  42         struct regulator_dev *regulator;
  43 };
  44
  45 /*
  46  * struct regulator
  47  *
  48  * One for each consumer device.
  49  */
  50 struct regulator {
  51         struct device *dev;
  52         struct list_head list;
  53         int uA_load;
  54         int min_uV;
  55         int max_uV;
  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                    and the constraints are used by list_voltage. */
 708                 if (count == 1 && !cmin) {
 709                         cmin = 1;
 710                         cmax = INT_MAX;
 711                         constraints->min_uV = cmin;
 712                         constraints->max_uV = cmax;
 713                 }
 714
 715                 /* voltage constraints are optional */
 716                 if ((cmin == 0) && (cmax == 0))
 717                         goto out;
 718
 719                 /* else require explicit machine-level constraints */
 720                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 721                         pr_err("%s: %s '%s' voltage constraints\n",
 722                                        __func__, "invalid", name);
 723                         ret = -EINVAL;
 724                         goto out;
 725                 }
 726
 727                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 728                 for (i = 0; i < count; i++) {
 729                         int     value;
 730
 731                         value = ops->list_voltage(rdev, i);
 732                         if (value <= 0)
 733                                 continue;
 734
 735                         /* maybe adjust [min_uV..max_uV] */
 736                         if (value >= cmin && value < min_uV)
 737                                 min_uV = value;
 738                         if (value <= cmax && value > max_uV)
 739                                 max_uV = value;
 740                 }
 741
 742                 /* final: [min_uV..max_uV] valid iff constraints valid */
 743                 if (max_uV < min_uV) {
 744                         pr_err("%s: %s '%s' voltage constraints\n",
 745                                        __func__, "unsupportable", name);
 746                         ret = -EINVAL;
 747                         goto out;
 748                 }
 749
 750                 /* use regulator's subset of machine constraints */
 751                 if (constraints->min_uV < min_uV) {
 752                         pr_debug("%s: override '%s' %s, %d -> %d\n",
 753                                        __func__, name, "min_uV",
 754                                         constraints->min_uV, min_uV);
 755                         constraints->min_uV = min_uV;
 756                 }
 757                 if (constraints->max_uV > max_uV) {
 758                         pr_debug("%s: override '%s' %s, %d -> %d\n",
 759                                        __func__, name, "max_uV",
 760                                         constraints->max_uV, max_uV);
 761                         constraints->max_uV = max_uV;
 762                 }
 763         }
 764
 765         rdev->constraints = constraints;
 766
 767         /* do we need to apply the constraint voltage */
 768         if (rdev->constraints->apply_uV &&
 769                 rdev->constraints->min_uV == rdev->constraints->max_uV &&
 770                 ops->set_voltage) {
 771                 ret = ops->set_voltage(rdev,
 772                         rdev->constraints->min_uV, rdev->constraints->max_uV);
 773                         if (ret < 0) {
 774                                 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
 775                                        __func__,
 776                                        rdev->constraints->min_uV, name);
 777                                 rdev->constraints = NULL;
 778                                 goto out;
 779                         }
 780         }
 781
 782         /* do we need to setup our suspend state */
 783         if (constraints->initial_state) {
 784                 ret = suspend_prepare(rdev, constraints->initial_state);
 785                 if (ret < 0) {
 786                         printk(KERN_ERR "%s: failed to set suspend state for %s\n",
 787                                __func__, name);
 788                         rdev->constraints = NULL;
 789                         goto out;
 790                 }
 791         }
 792
 793         if (constraints->initial_mode) {
 794                 if (!ops->set_mode) {
 795                         printk(KERN_ERR "%s: no set_mode operation for %s\n",
 796                                __func__, name);
 797                         ret = -EINVAL;
 798                         goto out;
 799                 }
 800
 801                 ret = ops->set_mode(rdev, constraints->initial_mode);
 802                 if (ret < 0) {
 803                         printk(KERN_ERR
 804                                "%s: failed to set initial mode for %s: %d\n",
 805                                __func__, name, ret);
 806                         goto out;
 807                 }
 808         }
 809
 810         /* If the constraints say the regulator should be on at this point
 811          * and we have control then make sure it is enabled.
 812          */
 813         if ((constraints->always_on || constraints->boot_on) && ops->enable) {
 814                 ret = ops->enable(rdev);
 815                 if (ret < 0) {
 816                         printk(KERN_ERR "%s: failed to enable %s\n",
 817                                __func__, name);
 818                         rdev->constraints = NULL;
 819                         goto out;
 820                 }
 821         }
 822
 823         print_constraints(rdev);
 824 out:
 825         return ret;
 826 }
 827
 828 /**
 829  * set_supply - set regulator supply regulator
 830  * @rdev: regulator name
 831  * @supply_rdev: supply regulator name
 832  *
 833  * Called by platform initialisation code to set the supply regulator for this
 834  * regulator. This ensures that a regulators supply will also be enabled by the
 835  * core if it's child is enabled.
 836  */
 837 static int set_supply(struct regulator_dev *rdev,
 838         struct regulator_dev *supply_rdev)
 839 {
 840         int err;
 841
 842         err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
 843                                 "supply");
 844         if (err) {
 845                 printk(KERN_ERR
 846                        "%s: could not add device link %s err %d\n",
 847                        __func__, supply_rdev->dev.kobj.name, err);
 848                        goto out;
 849         }
 850         rdev->supply = supply_rdev;
 851         list_add(&rdev->slist, &supply_rdev->supply_list);
 852 out:
 853         return err;
 854 }
 855
 856 /**
 857  * set_consumer_device_supply: Bind a regulator to a symbolic supply
 858  * @rdev:         regulator source
 859  * @consumer_dev: device the supply applies to
 860  * @consumer_dev_name: dev_name() string for device supply applies to
 861  * @supply:       symbolic name for supply
 862  *
 863  * Allows platform initialisation code to map physical regulator
 864  * sources to symbolic names for supplies for use by devices.  Devices
 865  * should use these symbolic names to request regulators, avoiding the
 866  * need to provide board-specific regulator names as platform data.
 867  *
 868  * Only one of consumer_dev and consumer_dev_name may be specified.
 869  */
 870 static int set_consumer_device_supply(struct regulator_dev *rdev,
 871         struct device *consumer_dev, const char *consumer_dev_name,
 872         const char *supply)
 873 {
 874         struct regulator_map *node;
 875
 876         if (consumer_dev && consumer_dev_name)
 877                 return -EINVAL;
 878
 879         if (!consumer_dev_name && consumer_dev)
 880                 consumer_dev_name = dev_name(consumer_dev);
 881
 882         if (supply == NULL)
 883                 return -EINVAL;
 884
 885         list_for_each_entry(node, &regulator_map_list, list) {
 886                 if (consumer_dev_name != node->dev_name)
 887                         continue;
 888                 if (strcmp(node->supply, supply) != 0)
 889                         continue;
 890
 891                 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
 892                                 dev_name(&node->regulator->dev),
 893                                 node->regulator->desc->name,
 894                                 supply,
 895                                 dev_name(&rdev->dev), rdev->desc->name);
 896                 return -EBUSY;
 897         }
 898
 899         node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
 900         if (node == NULL)
 901                 return -ENOMEM;
 902
 903         node->regulator = rdev;
 904         node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
 905         node->supply = supply;
 906
 907         if (node->dev_name == NULL) {
 908                 kfree(node);
 909                 return -ENOMEM;
 910         }
 911
 912         list_add(&node->list, &regulator_map_list);
 913         return 0;
 914 }
 915
 916 static void unset_consumer_device_supply(struct regulator_dev *rdev,
 917         const char *consumer_dev_name, struct device *consumer_dev)
 918 {
 919         struct regulator_map *node, *n;
 920
 921         if (consumer_dev && !consumer_dev_name)
 922                 consumer_dev_name = dev_name(consumer_dev);
 923
 924         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 925                 if (rdev != node->regulator)
 926                         continue;
 927
 928                 if (consumer_dev_name && node->dev_name &&
 929                     strcmp(consumer_dev_name, node->dev_name))
 930                         continue;
 931
 932                 list_del(&node->list);
 933                 kfree(node->dev_name);
 934                 kfree(node);
 935                 return;
 936         }
 937 }
 938
 939 static void unset_regulator_supplies(struct regulator_dev *rdev)
 940 {
 941         struct regulator_map *node, *n;
 942
 943         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 944                 if (rdev == node->regulator) {
 945                         list_del(&node->list);
 946                         kfree(node->dev_name);
 947                         kfree(node);
 948                         return;
 949                 }
 950         }
 951 }
 952
 953 #define REG_STR_SIZE    32
 954
 955 static struct regulator *create_regulator(struct regulator_dev *rdev,
 956                                           struct device *dev,
 957                                           const char *supply_name)
 958 {
 959         struct regulator *regulator;
 960         char buf[REG_STR_SIZE];
 961         int err, size;
 962
 963         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
 964         if (regulator == NULL)
 965                 return NULL;
 966
 967         mutex_lock(&rdev->mutex);
 968         regulator->rdev = rdev;
 969         list_add(&regulator->list, &rdev->consumer_list);
 970
 971         if (dev) {
 972                 /* create a 'requested_microamps_name' sysfs entry */
 973                 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
 974                         supply_name);
 975                 if (size >= REG_STR_SIZE)
 976                         goto overflow_err;
 977
 978                 regulator->dev = dev;
 979                 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
 980                 if (regulator->dev_attr.attr.name == NULL)
 981                         goto attr_name_err;
 982
 983                 regulator->dev_attr.attr.owner = THIS_MODULE;
 984                 regulator->dev_attr.attr.mode = 0444;
 985                 regulator->dev_attr.show = device_requested_uA_show;
 986                 err = device_create_file(dev, &regulator->dev_attr);
 987                 if (err < 0) {
 988                         printk(KERN_WARNING "%s: could not add regulator_dev"
 989                                 " load sysfs\n", __func__);
 990                         goto attr_name_err;
 991                 }
 992
 993                 /* also add a link to the device sysfs entry */
 994                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
 995                                  dev->kobj.name, supply_name);
 996                 if (size >= REG_STR_SIZE)
 997                         goto attr_err;
 998
 999                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1000                 if (regulator->supply_name == NULL)
1001                         goto attr_err;
1002
1003                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1004                                         buf);
1005                 if (err) {
1006                         printk(KERN_WARNING
1007                                "%s: could not add device link %s err %d\n",
1008                                __func__, dev->kobj.name, err);
1009                         device_remove_file(dev, &regulator->dev_attr);
1010                         goto link_name_err;
1011                 }
1012         }
1013         mutex_unlock(&rdev->mutex);
1014         return regulator;
1015 link_name_err:
1016         kfree(regulator->supply_name);
1017 attr_err:
1018         device_remove_file(regulator->dev, &regulator->dev_attr);
1019 attr_name_err:
1020         kfree(regulator->dev_attr.attr.name);
1021 overflow_err:
1022         list_del(&regulator->list);
1023         kfree(regulator);
1024         mutex_unlock(&rdev->mutex);
1025         return NULL;
1026 }
1027
1028 /* Internal regulator request function */
1029 static struct regulator *_regulator_get(struct device *dev, const char *id,
1030                                         int exclusive)
1031 {
1032         struct regulator_dev *rdev;
1033         struct regulator_map *map;
1034         struct regulator *regulator = ERR_PTR(-ENODEV);
1035         const char *devname = NULL;
1036         int ret;
1037
1038         if (id == NULL) {
1039                 printk(KERN_ERR "regulator: get() with no identifier\n");
1040                 return regulator;
1041         }
1042
1043         if (dev)
1044                 devname = dev_name(dev);
1045
1046         mutex_lock(&regulator_list_mutex);
1047
1048         list_for_each_entry(map, &regulator_map_list, list) {
1049                 /* If the mapping has a device set up it must match */
1050                 if (map->dev_name &&
1051                     (!devname || strcmp(map->dev_name, devname)))
1052                         continue;
1053
1054                 if (strcmp(map->supply, id) == 0) {
1055                         rdev = map->regulator;
1056                         goto found;
1057                 }
1058         }
1059         mutex_unlock(&regulator_list_mutex);
1060         return regulator;
1061
1062 found:
1063         if (rdev->exclusive) {
1064                 regulator = ERR_PTR(-EPERM);
1065                 goto out;
1066         }
1067
1068         if (exclusive && rdev->open_count) {
1069                 regulator = ERR_PTR(-EBUSY);
1070                 goto out;
1071         }
1072
1073         if (!try_module_get(rdev->owner))
1074                 goto out;
1075
1076         regulator = create_regulator(rdev, dev, id);
1077         if (regulator == NULL) {
1078                 regulator = ERR_PTR(-ENOMEM);
1079                 module_put(rdev->owner);
1080         }
1081
1082         rdev->open_count++;
1083         if (exclusive) {
1084                 rdev->exclusive = 1;
1085
1086                 ret = _regulator_is_enabled(rdev);
1087                 if (ret > 0)
1088                         rdev->use_count = 1;
1089                 else
1090                         rdev->use_count = 0;
1091         }
1092
1093 out:
1094         mutex_unlock(&regulator_list_mutex);
1095
1096         return regulator;
1097 }
1098
1099 /**
1100  * regulator_get - lookup and obtain a reference to a regulator.
1101  * @dev: device for regulator "consumer"
1102  * @id: Supply name or regulator ID.
1103  *
1104  * Returns a struct regulator corresponding to the regulator producer,
1105  * or IS_ERR() condition containing errno.
1106  *
1107  * Use of supply names configured via regulator_set_device_supply() is
1108  * strongly encouraged.  It is recommended that the supply name used
1109  * should match the name used for the supply and/or the relevant
1110  * device pins in the datasheet.
1111  */
1112 struct regulator *regulator_get(struct device *dev, const char *id)
1113 {
1114         return _regulator_get(dev, id, 0);
1115 }
1116 EXPORT_SYMBOL_GPL(regulator_get);
1117
1118 /**
1119  * regulator_get_exclusive - obtain exclusive access to a regulator.
1120  * @dev: device for regulator "consumer"
1121  * @id: Supply name or regulator ID.
1122  *
1123  * Returns a struct regulator corresponding to the regulator producer,
1124  * or IS_ERR() condition containing errno.  Other consumers will be
1125  * unable to obtain this reference is held and the use count for the
1126  * regulator will be initialised to reflect the current state of the
1127  * regulator.
1128  *
1129  * This is intended for use by consumers which cannot tolerate shared
1130  * use of the regulator such as those which need to force the
1131  * regulator off for correct operation of the hardware they are
1132  * controlling.
1133  *
1134  * Use of supply names configured via regulator_set_device_supply() is
1135  * strongly encouraged.  It is recommended that the supply name used
1136  * should match the name used for the supply and/or the relevant
1137  * device pins in the datasheet.
1138  */
1139 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1140 {
1141         return _regulator_get(dev, id, 1);
1142 }
1143 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1144
1145 /**
1146  * regulator_put - "free" the regulator source
1147  * @regulator: regulator source
1148  *
1149  * Note: drivers must ensure that all regulator_enable calls made on this
1150  * regulator source are balanced by regulator_disable calls prior to calling
1151  * this function.
1152  */
1153 void regulator_put(struct regulator *regulator)
1154 {
1155         struct regulator_dev *rdev;
1156
1157         if (regulator == NULL || IS_ERR(regulator))
1158                 return;
1159
1160         mutex_lock(&regulator_list_mutex);
1161         rdev = regulator->rdev;
1162
1163         /* remove any sysfs entries */
1164         if (regulator->dev) {
1165                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1166                 kfree(regulator->supply_name);
1167                 device_remove_file(regulator->dev, &regulator->dev_attr);
1168                 kfree(regulator->dev_attr.attr.name);
1169         }
1170         list_del(&regulator->list);
1171         kfree(regulator);
1172
1173         rdev->open_count--;
1174         rdev->exclusive = 0;
1175
1176         module_put(rdev->owner);
1177         mutex_unlock(&regulator_list_mutex);
1178 }
1179 EXPORT_SYMBOL_GPL(regulator_put);
1180
1181 /* locks held by regulator_enable() */
1182 static int _regulator_enable(struct regulator_dev *rdev)
1183 {
1184         int ret = -EINVAL;
1185
1186         if (!rdev->constraints) {
1187                 printk(KERN_ERR "%s: %s has no constraints\n",
1188                        __func__, rdev->desc->name);
1189                 return ret;
1190         }
1191
1192         /* do we need to enable the supply regulator first */
1193         if (rdev->supply) {
1194                 ret = _regulator_enable(rdev->supply);
1195                 if (ret < 0) {
1196                         printk(KERN_ERR "%s: failed to enable %s: %d\n",
1197                                __func__, rdev->desc->name, ret);
1198                         return ret;
1199                 }
1200         }
1201
1202         /* check voltage and requested load before enabling */
1203         if (rdev->desc->ops->enable) {
1204
1205                 if (rdev->constraints &&
1206                         (rdev->constraints->valid_ops_mask &
1207                         REGULATOR_CHANGE_DRMS))
1208                         drms_uA_update(rdev);
1209
1210                 ret = rdev->desc->ops->enable(rdev);
1211                 if (ret < 0) {
1212                         printk(KERN_ERR "%s: failed to enable %s: %d\n",
1213                                __func__, rdev->desc->name, ret);
1214                         return ret;
1215                 }
1216                 rdev->use_count++;
1217                 return ret;
1218         }
1219
1220         return ret;
1221 }
1222
1223 /**
1224  * regulator_enable - enable regulator output
1225  * @regulator: regulator source
1226  *
1227  * Request that the regulator be enabled with the regulator output at
1228  * the predefined voltage or current value.  Calls to regulator_enable()
1229  * must be balanced with calls to regulator_disable().
1230  *
1231  * NOTE: the output value can be set by other drivers, boot loader or may be
1232  * hardwired in the regulator.
1233  */
1234 int regulator_enable(struct regulator *regulator)
1235 {
1236         struct regulator_dev *rdev = regulator->rdev;
1237         int ret = 0;
1238
1239         mutex_lock(&rdev->mutex);
1240         ret = _regulator_enable(rdev);
1241         mutex_unlock(&rdev->mutex);
1242         return ret;
1243 }
1244 EXPORT_SYMBOL_GPL(regulator_enable);
1245
1246 /* locks held by regulator_disable() */
1247 static int _regulator_disable(struct regulator_dev *rdev)
1248 {
1249         int ret = 0;
1250
1251         if (WARN(rdev->use_count <= 0,
1252                         "unbalanced disables for %s\n",
1253                         rdev->desc->name))
1254                 return -EIO;
1255
1256         /* are we the last user and permitted to disable ? */
1257         if (rdev->use_count == 1 && !rdev->constraints->always_on) {
1258
1259                 /* we are last user */
1260                 if (rdev->desc->ops->disable) {
1261                         ret = rdev->desc->ops->disable(rdev);
1262                         if (ret < 0) {
1263                                 printk(KERN_ERR "%s: failed to disable %s\n",
1264                                        __func__, rdev->desc->name);
1265                                 return ret;
1266                         }
1267                 }
1268
1269                 /* decrease our supplies ref count and disable if required */
1270                 if (rdev->supply)
1271                         _regulator_disable(rdev->supply);
1272
1273                 rdev->use_count = 0;
1274         } else if (rdev->use_count > 1) {
1275
1276                 if (rdev->constraints &&
1277                         (rdev->constraints->valid_ops_mask &
1278                         REGULATOR_CHANGE_DRMS))
1279                         drms_uA_update(rdev);
1280
1281                 rdev->use_count--;
1282         }
1283         return ret;
1284 }
1285
1286 /**
1287  * regulator_disable - disable regulator output
1288  * @regulator: regulator source
1289  *
1290  * Disable the regulator output voltage or current.  Calls to
1291  * regulator_enable() must be balanced with calls to
1292  * regulator_disable().
1293  *
1294  * NOTE: this will only disable the regulator output if no other consumer
1295  * devices have it enabled, the regulator device supports disabling and
1296  * machine constraints permit this operation.
1297  */
1298 int regulator_disable(struct regulator *regulator)
1299 {
1300         struct regulator_dev *rdev = regulator->rdev;
1301         int ret = 0;
1302
1303         mutex_lock(&rdev->mutex);
1304         ret = _regulator_disable(rdev);
1305         mutex_unlock(&rdev->mutex);
1306         return ret;
1307 }
1308 EXPORT_SYMBOL_GPL(regulator_disable);
1309
1310 /* locks held by regulator_force_disable() */
1311 static int _regulator_force_disable(struct regulator_dev *rdev)
1312 {
1313         int ret = 0;
1314
1315         /* force disable */
1316         if (rdev->desc->ops->disable) {
1317                 /* ah well, who wants to live forever... */
1318                 ret = rdev->desc->ops->disable(rdev);
1319                 if (ret < 0) {
1320                         printk(KERN_ERR "%s: failed to force disable %s\n",
1321                                __func__, rdev->desc->name);
1322                         return ret;
1323                 }
1324                 /* notify other consumers that power has been forced off */
1325                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
1326                         NULL);
1327         }
1328
1329         /* decrease our supplies ref count and disable if required */
1330         if (rdev->supply)
1331                 _regulator_disable(rdev->supply);
1332
1333         rdev->use_count = 0;
1334         return ret;
1335 }
1336
1337 /**
1338  * regulator_force_disable - force disable regulator output
1339  * @regulator: regulator source
1340  *
1341  * Forcibly disable the regulator output voltage or current.
1342  * NOTE: this *will* disable the regulator output even if other consumer
1343  * devices have it enabled. This should be used for situations when device
1344  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1345  */
1346 int regulator_force_disable(struct regulator *regulator)
1347 {
1348         int ret;
1349
1350         mutex_lock(&regulator->rdev->mutex);
1351         regulator->uA_load = 0;
1352         ret = _regulator_force_disable(regulator->rdev);
1353         mutex_unlock(&regulator->rdev->mutex);
1354         return ret;
1355 }
1356 EXPORT_SYMBOL_GPL(regulator_force_disable);
1357
1358 static int _regulator_is_enabled(struct regulator_dev *rdev)
1359 {
1360         int ret;
1361
1362         mutex_lock(&rdev->mutex);
1363
1364         /* sanity check */
1365         if (!rdev->desc->ops->is_enabled) {
1366                 ret = -EINVAL;
1367                 goto out;
1368         }
1369
1370         ret = rdev->desc->ops->is_enabled(rdev);
1371 out:
1372         mutex_unlock(&rdev->mutex);
1373         return ret;
1374 }
1375
1376 /**
1377  * regulator_is_enabled - is the regulator output enabled
1378  * @regulator: regulator source
1379  *
1380  * Returns positive if the regulator driver backing the source/client
1381  * has requested that the device be enabled, zero if it hasn't, else a
1382  * negative errno code.
1383  *
1384  * Note that the device backing this regulator handle can have multiple
1385  * users, so it might be enabled even if regulator_enable() was never
1386  * called for this particular source.
1387  */
1388 int regulator_is_enabled(struct regulator *regulator)
1389 {
1390         return _regulator_is_enabled(regulator->rdev);
1391 }
1392 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1393
1394 /**
1395  * regulator_count_voltages - count regulator_list_voltage() selectors
1396  * @regulator: regulator source
1397  *
1398  * Returns number of selectors, or negative errno.  Selectors are
1399  * numbered starting at zero, and typically correspond to bitfields
1400  * in hardware registers.
1401  */
1402 int regulator_count_voltages(struct regulator *regulator)
1403 {
1404         struct regulator_dev    *rdev = regulator->rdev;
1405
1406         return rdev->desc->n_voltages ? : -EINVAL;
1407 }
1408 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1409
1410 /**
1411  * regulator_list_voltage - enumerate supported voltages
1412  * @regulator: regulator source
1413  * @selector: identify voltage to list
1414  * Context: can sleep
1415  *
1416  * Returns a voltage that can be passed to @regulator_set_voltage(),
1417  * zero if this selector code can't be used on this sytem, or a
1418  * negative errno.
1419  */
1420 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1421 {
1422         struct regulator_dev    *rdev = regulator->rdev;
1423         struct regulator_ops    *ops = rdev->desc->ops;
1424         int                     ret;
1425
1426         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1427                 return -EINVAL;
1428
1429         mutex_lock(&rdev->mutex);
1430         ret = ops->list_voltage(rdev, selector);
1431         mutex_unlock(&rdev->mutex);
1432
1433         if (ret > 0) {
1434                 if (ret < rdev->constraints->min_uV)
1435                         ret = 0;
1436                 else if (ret > rdev->constraints->max_uV)
1437                         ret = 0;
1438         }
1439
1440         return ret;
1441 }
1442 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1443
1444 /**
1445  * regulator_is_supported_voltage - check if a voltage range can be supported
1446  *
1447  * @regulator: Regulator to check.
1448  * @min_uV: Minimum required voltage in uV.
1449  * @max_uV: Maximum required voltage in uV.
1450  *
1451  * Returns a boolean or a negative error code.
1452  */
1453 int regulator_is_supported_voltage(struct regulator *regulator,
1454                                    int min_uV, int max_uV)
1455 {
1456         int i, voltages, ret;
1457
1458         ret = regulator_count_voltages(regulator);
1459         if (ret < 0)
1460                 return ret;
1461         voltages = ret;
1462
1463         for (i = 0; i < voltages; i++) {
1464                 ret = regulator_list_voltage(regulator, i);
1465
1466                 if (ret >= min_uV && ret <= max_uV)
1467                         return 1;
1468         }
1469
1470         return 0;
1471 }
1472
1473 /**
1474  * regulator_set_voltage - set regulator output voltage
1475  * @regulator: regulator source
1476  * @min_uV: Minimum required voltage in uV
1477  * @max_uV: Maximum acceptable voltage in uV
1478  *
1479  * Sets a voltage regulator to the desired output voltage. This can be set
1480  * during any regulator state. IOW, regulator can be disabled or enabled.
1481  *
1482  * If the regulator is enabled then the voltage will change to the new value
1483  * immediately otherwise if the regulator is disabled the regulator will
1484  * output at the new voltage when enabled.
1485  *
1486  * NOTE: If the regulator is shared between several devices then the lowest
1487  * request voltage that meets the system constraints will be used.
1488  * Regulator system constraints must be set for this regulator before
1489  * calling this function otherwise this call will fail.
1490  */
1491 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1492 {
1493         struct regulator_dev *rdev = regulator->rdev;
1494         int ret;
1495
1496         mutex_lock(&rdev->mutex);
1497
1498         /* sanity check */
1499         if (!rdev->desc->ops->set_voltage) {
1500                 ret = -EINVAL;
1501                 goto out;
1502         }
1503
1504         /* constraints check */
1505         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1506         if (ret < 0)
1507                 goto out;
1508         regulator->min_uV = min_uV;
1509         regulator->max_uV = max_uV;
1510         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1511
1512 out:
1513         _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
1514         mutex_unlock(&rdev->mutex);
1515         return ret;
1516 }
1517 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1518
1519 static int _regulator_get_voltage(struct regulator_dev *rdev)
1520 {
1521         /* sanity check */
1522         if (rdev->desc->ops->get_voltage)
1523                 return rdev->desc->ops->get_voltage(rdev);
1524         else
1525                 return -EINVAL;
1526 }
1527
1528 /**
1529  * regulator_get_voltage - get regulator output voltage
1530  * @regulator: regulator source
1531  *
1532  * This returns the current regulator voltage in uV.
1533  *
1534  * NOTE: If the regulator is disabled it will return the voltage value. This
1535  * function should not be used to determine regulator state.
1536  */
1537 int regulator_get_voltage(struct regulator *regulator)
1538 {
1539         int ret;
1540
1541         mutex_lock(&regulator->rdev->mutex);
1542
1543         ret = _regulator_get_voltage(regulator->rdev);
1544
1545         mutex_unlock(&regulator->rdev->mutex);
1546
1547         return ret;
1548 }
1549 EXPORT_SYMBOL_GPL(regulator_get_voltage);
1550
1551 /**
1552  * regulator_set_current_limit - set regulator output current limit
1553  * @regulator: regulator source
1554  * @min_uA: Minimuum supported current in uA
1555  * @max_uA: Maximum supported current in uA
1556  *
1557  * Sets current sink to the desired output current. This can be set during
1558  * any regulator state. IOW, regulator can be disabled or enabled.
1559  *
1560  * If the regulator is enabled then the current will change to the new value
1561  * immediately otherwise if the regulator is disabled the regulator will
1562  * output at the new current when enabled.
1563  *
1564  * NOTE: Regulator system constraints must be set for this regulator before
1565  * calling this function otherwise this call will fail.
1566  */
1567 int regulator_set_current_limit(struct regulator *regulator,
1568                                int min_uA, int max_uA)
1569 {
1570         struct regulator_dev *rdev = regulator->rdev;
1571         int ret;
1572
1573         mutex_lock(&rdev->mutex);
1574
1575         /* sanity check */
1576         if (!rdev->desc->ops->set_current_limit) {
1577                 ret = -EINVAL;
1578                 goto out;
1579         }
1580
1581         /* constraints check */
1582         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1583         if (ret < 0)
1584                 goto out;
1585
1586         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1587 out:
1588         mutex_unlock(&rdev->mutex);
1589         return ret;
1590 }
1591 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1592
1593 static int _regulator_get_current_limit(struct regulator_dev *rdev)
1594 {
1595         int ret;
1596
1597         mutex_lock(&rdev->mutex);
1598
1599         /* sanity check */
1600         if (!rdev->desc->ops->get_current_limit) {
1601                 ret = -EINVAL;
1602                 goto out;
1603         }
1604
1605         ret = rdev->desc->ops->get_current_limit(rdev);
1606 out:
1607         mutex_unlock(&rdev->mutex);
1608         return ret;
1609 }
1610
1611 /**
1612  * regulator_get_current_limit - get regulator output current
1613  * @regulator: regulator source
1614  *
1615  * This returns the current supplied by the specified current sink in uA.
1616  *
1617  * NOTE: If the regulator is disabled it will return the current value. This
1618  * function should not be used to determine regulator state.
1619  */
1620 int regulator_get_current_limit(struct regulator *regulator)
1621 {
1622         return _regulator_get_current_limit(regulator->rdev);
1623 }
1624 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1625
1626 /**
1627  * regulator_set_mode - set regulator operating mode
1628  * @regulator: regulator source
1629  * @mode: operating mode - one of the REGULATOR_MODE constants
1630  *
1631  * Set regulator operating mode to increase regulator efficiency or improve
1632  * regulation performance.
1633  *
1634  * NOTE: Regulator system constraints must be set for this regulator before
1635  * calling this function otherwise this call will fail.
1636  */
1637 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1638 {
1639         struct regulator_dev *rdev = regulator->rdev;
1640         int ret;
1641
1642         mutex_lock(&rdev->mutex);
1643
1644         /* sanity check */
1645         if (!rdev->desc->ops->set_mode) {
1646                 ret = -EINVAL;
1647                 goto out;
1648         }
1649
1650         /* constraints check */
1651         ret = regulator_check_mode(rdev, mode);
1652         if (ret < 0)
1653                 goto out;
1654
1655         ret = rdev->desc->ops->set_mode(rdev, mode);
1656 out:
1657         mutex_unlock(&rdev->mutex);
1658         return ret;
1659 }
1660 EXPORT_SYMBOL_GPL(regulator_set_mode);
1661
1662 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1663 {
1664         int ret;
1665
1666         mutex_lock(&rdev->mutex);
1667
1668         /* sanity check */
1669         if (!rdev->desc->ops->get_mode) {
1670                 ret = -EINVAL;
1671                 goto out;
1672         }
1673
1674         ret = rdev->desc->ops->get_mode(rdev);
1675 out:
1676         mutex_unlock(&rdev->mutex);
1677         return ret;
1678 }
1679
1680 /**
1681  * regulator_get_mode - get regulator operating mode
1682  * @regulator: regulator source
1683  *
1684  * Get the current regulator operating mode.
1685  */
1686 unsigned int regulator_get_mode(struct regulator *regulator)
1687 {
1688         return _regulator_get_mode(regulator->rdev);
1689 }
1690 EXPORT_SYMBOL_GPL(regulator_get_mode);
1691
1692 /**
1693  * regulator_set_optimum_mode - set regulator optimum operating mode
1694  * @regulator: regulator source
1695  * @uA_load: load current
1696  *
1697  * Notifies the regulator core of a new device load. This is then used by
1698  * DRMS (if enabled by constraints) to set the most efficient regulator
1699  * operating mode for the new regulator loading.
1700  *
1701  * Consumer devices notify their supply regulator of the maximum power
1702  * they will require (can be taken from device datasheet in the power
1703  * consumption tables) when they change operational status and hence power
1704  * state. Examples of operational state changes that can affect power
1705  * consumption are :-
1706  *
1707  *    o Device is opened / closed.
1708  *    o Device I/O is about to begin or has just finished.
1709  *    o Device is idling in between work.
1710  *
1711  * This information is also exported via sysfs to userspace.
1712  *
1713  * DRMS will sum the total requested load on the regulator and change
1714  * to the most efficient operating mode if platform constraints allow.
1715  *
1716  * Returns the new regulator mode or error.
1717  */
1718 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1719 {
1720         struct regulator_dev *rdev = regulator->rdev;
1721         struct regulator *consumer;
1722         int ret, output_uV, input_uV, total_uA_load = 0;
1723         unsigned int mode;
1724
1725         mutex_lock(&rdev->mutex);
1726
1727         regulator->uA_load = uA_load;
1728         ret = regulator_check_drms(rdev);
1729         if (ret < 0)
1730                 goto out;
1731         ret = -EINVAL;
1732
1733         /* sanity check */
1734         if (!rdev->desc->ops->get_optimum_mode)
1735                 goto out;
1736
1737         /* get output voltage */
1738         output_uV = rdev->desc->ops->get_voltage(rdev);
1739         if (output_uV <= 0) {
1740                 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1741                         __func__, rdev->desc->name);
1742                 goto out;
1743         }
1744
1745         /* get input voltage */
1746         if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1747                 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1748         else
1749                 input_uV = rdev->constraints->input_uV;
1750         if (input_uV <= 0) {
1751                 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1752                         __func__, rdev->desc->name);
1753                 goto out;
1754         }
1755
1756         /* calc total requested load for this regulator */
1757         list_for_each_entry(consumer, &rdev->consumer_list, list)
1758             total_uA_load += consumer->uA_load;
1759
1760         mode = rdev->desc->ops->get_optimum_mode(rdev,
1761                                                  input_uV, output_uV,
1762                                                  total_uA_load);
1763         ret = regulator_check_mode(rdev, mode);
1764         if (ret < 0) {
1765                 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1766                         " %d uA %d -> %d uV\n", __func__, rdev->desc->name,
1767                         total_uA_load, input_uV, output_uV);
1768                 goto out;
1769         }
1770
1771         ret = rdev->desc->ops->set_mode(rdev, mode);
1772         if (ret < 0) {
1773                 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1774                         __func__, mode, rdev->desc->name);
1775                 goto out;
1776         }
1777         ret = mode;
1778 out:
1779         mutex_unlock(&rdev->mutex);
1780         return ret;
1781 }
1782 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1783
1784 /**
1785  * regulator_register_notifier - register regulator event notifier
1786  * @regulator: regulator source
1787  * @nb: notifier block
1788  *
1789  * Register notifier block to receive regulator events.
1790  */
1791 int regulator_register_notifier(struct regulator *regulator,
1792                               struct notifier_block *nb)
1793 {
1794         return blocking_notifier_chain_register(&regulator->rdev->notifier,
1795                                                 nb);
1796 }
1797 EXPORT_SYMBOL_GPL(regulator_register_notifier);
1798
1799 /**
1800  * regulator_unregister_notifier - unregister regulator event notifier
1801  * @regulator: regulator source
1802  * @nb: notifier block
1803  *
1804  * Unregister regulator event notifier block.
1805  */
1806 int regulator_unregister_notifier(struct regulator *regulator,
1807                                 struct notifier_block *nb)
1808 {
1809         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1810                                                   nb);
1811 }
1812 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1813
1814 /* notify regulator consumers and downstream regulator consumers.
1815  * Note mutex must be held by caller.
1816  */
1817 static void _notifier_call_chain(struct regulator_dev *rdev,
1818                                   unsigned long event, void *data)
1819 {
1820         struct regulator_dev *_rdev;
1821
1822         /* call rdev chain first */
1823         blocking_notifier_call_chain(&rdev->notifier, event, NULL);
1824
1825         /* now notify regulator we supply */
1826         list_for_each_entry(_rdev, &rdev->supply_list, slist) {
1827           mutex_lock(&_rdev->mutex);
1828           _notifier_call_chain(_rdev, event, data);
1829           mutex_unlock(&_rdev->mutex);
1830         }
1831 }
1832
1833 /**
1834  * regulator_bulk_get - get multiple regulator consumers
1835  *
1836  * @dev:           Device to supply
1837  * @num_consumers: Number of consumers to register
1838  * @consumers:     Configuration of consumers; clients are stored here.
1839  *
1840  * @return 0 on success, an errno on failure.
1841  *
1842  * This helper function allows drivers to get several regulator
1843  * consumers in one operation.  If any of the regulators cannot be
1844  * acquired then any regulators that were allocated will be freed
1845  * before returning to the caller.
1846  */
1847 int regulator_bulk_get(struct device *dev, int num_consumers,
1848                        struct regulator_bulk_data *consumers)
1849 {
1850         int i;
1851         int ret;
1852
1853         for (i = 0; i < num_consumers; i++)
1854                 consumers[i].consumer = NULL;
1855
1856         for (i = 0; i < num_consumers; i++) {
1857                 consumers[i].consumer = regulator_get(dev,
1858                                                       consumers[i].supply);
1859                 if (IS_ERR(consumers[i].consumer)) {
1860                         dev_err(dev, "Failed to get supply '%s'\n",
1861                                 consumers[i].supply);
1862                         ret = PTR_ERR(consumers[i].consumer);
1863                         consumers[i].consumer = NULL;
1864                         goto err;
1865                 }
1866         }
1867
1868         return 0;
1869
1870 err:
1871         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1872                 regulator_put(consumers[i].consumer);
1873
1874         return ret;
1875 }
1876 EXPORT_SYMBOL_GPL(regulator_bulk_get);
1877
1878 /**
1879  * regulator_bulk_enable - enable multiple regulator consumers
1880  *
1881  * @num_consumers: Number of consumers
1882  * @consumers:     Consumer data; clients are stored here.
1883  * @return         0 on success, an errno on failure
1884  *
1885  * This convenience API allows consumers to enable multiple regulator
1886  * clients in a single API call.  If any consumers cannot be enabled
1887  * then any others that were enabled will be disabled again prior to
1888  * return.
1889  */
1890 int regulator_bulk_enable(int num_consumers,
1891                           struct regulator_bulk_data *consumers)
1892 {
1893         int i;
1894         int ret;
1895
1896         for (i = 0; i < num_consumers; i++) {
1897                 ret = regulator_enable(consumers[i].consumer);
1898                 if (ret != 0)
1899                         goto err;
1900         }
1901
1902         return 0;
1903
1904 err:
1905         printk(KERN_ERR "Failed to enable %s\n", consumers[i].supply);
1906         for (i = 0; i < num_consumers; i++)
1907                 regulator_disable(consumers[i].consumer);
1908
1909         return ret;
1910 }
1911 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
1912
1913 /**
1914  * regulator_bulk_disable - disable multiple regulator consumers
1915  *
1916  * @num_consumers: Number of consumers
1917  * @consumers:     Consumer data; clients are stored here.
1918  * @return         0 on success, an errno on failure
1919  *
1920  * This convenience API allows consumers to disable multiple regulator
1921  * clients in a single API call.  If any consumers cannot be enabled
1922  * then any others that were disabled will be disabled again prior to
1923  * return.
1924  */
1925 int regulator_bulk_disable(int num_consumers,
1926                            struct regulator_bulk_data *consumers)
1927 {
1928         int i;
1929         int ret;
1930
1931         for (i = 0; i < num_consumers; i++) {
1932                 ret = regulator_disable(consumers[i].consumer);
1933                 if (ret != 0)
1934                         goto err;
1935         }
1936
1937         return 0;
1938
1939 err:
1940         printk(KERN_ERR "Failed to disable %s\n", consumers[i].supply);
1941         for (i = 0; i < num_consumers; i++)
1942                 regulator_enable(consumers[i].consumer);
1943
1944         return ret;
1945 }
1946 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
1947
1948 /**
1949  * regulator_bulk_free - free multiple regulator consumers
1950  *
1951  * @num_consumers: Number of consumers
1952  * @consumers:     Consumer data; clients are stored here.
1953  *
1954  * This convenience API allows consumers to free multiple regulator
1955  * clients in a single API call.
1956  */
1957 void regulator_bulk_free(int num_consumers,
1958                          struct regulator_bulk_data *consumers)
1959 {
1960         int i;
1961
1962         for (i = 0; i < num_consumers; i++) {
1963                 regulator_put(consumers[i].consumer);
1964                 consumers[i].consumer = NULL;
1965         }
1966 }
1967 EXPORT_SYMBOL_GPL(regulator_bulk_free);
1968
1969 /**
1970  * regulator_notifier_call_chain - call regulator event notifier
1971  * @rdev: regulator source
1972  * @event: notifier block
1973  * @data: callback-specific data.
1974  *
1975  * Called by regulator drivers to notify clients a regulator event has
1976  * occurred. We also notify regulator clients downstream.
1977  * Note lock must be held by caller.
1978  */
1979 int regulator_notifier_call_chain(struct regulator_dev *rdev,
1980                                   unsigned long event, void *data)
1981 {
1982         _notifier_call_chain(rdev, event, data);
1983         return NOTIFY_DONE;
1984
1985 }
1986 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
1987
1988 /**
1989  * regulator_mode_to_status - convert a regulator mode into a status
1990  *
1991  * @mode: Mode to convert
1992  *
1993  * Convert a regulator mode into a status.
1994  */
1995 int regulator_mode_to_status(unsigned int mode)
1996 {
1997         switch (mode) {
1998         case REGULATOR_MODE_FAST:
1999                 return REGULATOR_STATUS_FAST;
2000         case REGULATOR_MODE_NORMAL:
2001                 return REGULATOR_STATUS_NORMAL;
2002         case REGULATOR_MODE_IDLE:
2003                 return REGULATOR_STATUS_IDLE;
2004         case REGULATOR_STATUS_STANDBY:
2005                 return REGULATOR_STATUS_STANDBY;
2006         default:
2007                 return 0;
2008         }
2009 }
2010 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2011
2012 /*
2013  * To avoid cluttering sysfs (and memory) with useless state, only
2014  * create attributes that can be meaningfully displayed.
2015  */
2016 static int add_regulator_attributes(struct regulator_dev *rdev)
2017 {
2018         struct device           *dev = &rdev->dev;
2019         struct regulator_ops    *ops = rdev->desc->ops;
2020         int                     status = 0;
2021
2022         /* some attributes need specific methods to be displayed */
2023         if (ops->get_voltage) {
2024                 status = device_create_file(dev, &dev_attr_microvolts);
2025                 if (status < 0)
2026                         return status;
2027         }
2028         if (ops->get_current_limit) {
2029                 status = device_create_file(dev, &dev_attr_microamps);
2030                 if (status < 0)
2031                         return status;
2032         }
2033         if (ops->get_mode) {
2034                 status = device_create_file(dev, &dev_attr_opmode);
2035                 if (status < 0)
2036                         return status;
2037         }
2038         if (ops->is_enabled) {
2039                 status = device_create_file(dev, &dev_attr_state);
2040                 if (status < 0)
2041                         return status;
2042         }
2043         if (ops->get_status) {
2044                 status = device_create_file(dev, &dev_attr_status);
2045                 if (status < 0)
2046                         return status;
2047         }
2048
2049         /* some attributes are type-specific */
2050         if (rdev->desc->type == REGULATOR_CURRENT) {
2051                 status = device_create_file(dev, &dev_attr_requested_microamps);
2052                 if (status < 0)
2053                         return status;
2054         }
2055
2056         /* all the other attributes exist to support constraints;
2057          * don't show them if there are no constraints, or if the
2058          * relevant supporting methods are missing.
2059          */
2060         if (!rdev->constraints)
2061                 return status;
2062
2063         /* constraints need specific supporting methods */
2064         if (ops->set_voltage) {
2065                 status = device_create_file(dev, &dev_attr_min_microvolts);
2066                 if (status < 0)
2067                         return status;
2068                 status = device_create_file(dev, &dev_attr_max_microvolts);
2069                 if (status < 0)
2070                         return status;
2071         }
2072         if (ops->set_current_limit) {
2073                 status = device_create_file(dev, &dev_attr_min_microamps);
2074                 if (status < 0)
2075                         return status;
2076                 status = device_create_file(dev, &dev_attr_max_microamps);
2077                 if (status < 0)
2078                         return status;
2079         }
2080
2081         /* suspend mode constraints need multiple supporting methods */
2082         if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2083                 return status;
2084
2085         status = device_create_file(dev, &dev_attr_suspend_standby_state);
2086         if (status < 0)
2087                 return status;
2088         status = device_create_file(dev, &dev_attr_suspend_mem_state);
2089         if (status < 0)
2090                 return status;
2091         status = device_create_file(dev, &dev_attr_suspend_disk_state);
2092         if (status < 0)
2093                 return status;
2094
2095         if (ops->set_suspend_voltage) {
2096                 status = device_create_file(dev,
2097                                 &dev_attr_suspend_standby_microvolts);
2098                 if (status < 0)
2099                         return status;
2100                 status = device_create_file(dev,
2101                                 &dev_attr_suspend_mem_microvolts);
2102                 if (status < 0)
2103                         return status;
2104                 status = device_create_file(dev,
2105                                 &dev_attr_suspend_disk_microvolts);
2106                 if (status < 0)
2107                         return status;
2108         }
2109
2110         if (ops->set_suspend_mode) {
2111                 status = device_create_file(dev,
2112                                 &dev_attr_suspend_standby_mode);
2113                 if (status < 0)
2114                         return status;
2115                 status = device_create_file(dev,
2116                                 &dev_attr_suspend_mem_mode);
2117                 if (status < 0)
2118                         return status;
2119                 status = device_create_file(dev,
2120                                 &dev_attr_suspend_disk_mode);
2121                 if (status < 0)
2122                         return status;
2123         }
2124
2125         return status;
2126 }
2127
2128 /**
2129  * regulator_register - register regulator
2130  * @regulator_desc: regulator to register
2131  * @dev: struct device for the regulator
2132  * @init_data: platform provided init data, passed through by driver
2133  * @driver_data: private regulator data
2134  *
2135  * Called by regulator drivers to register a regulator.
2136  * Returns 0 on success.
2137  */
2138 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2139         struct device *dev, struct regulator_init_data *init_data,
2140         void *driver_data)
2141 {
2142         static atomic_t regulator_no = ATOMIC_INIT(0);
2143         struct regulator_dev *rdev;
2144         int ret, i;
2145
2146         if (regulator_desc == NULL)
2147                 return ERR_PTR(-EINVAL);
2148
2149         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2150                 return ERR_PTR(-EINVAL);
2151
2152         if (regulator_desc->type != REGULATOR_VOLTAGE &&
2153             regulator_desc->type != REGULATOR_CURRENT)
2154                 return ERR_PTR(-EINVAL);
2155
2156         if (!init_data)
2157                 return ERR_PTR(-EINVAL);
2158
2159         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2160         if (rdev == NULL)
2161                 return ERR_PTR(-ENOMEM);
2162
2163         mutex_lock(&regulator_list_mutex);
2164
2165         mutex_init(&rdev->mutex);
2166         rdev->reg_data = driver_data;
2167         rdev->owner = regulator_desc->owner;
2168         rdev->desc = regulator_desc;
2169         INIT_LIST_HEAD(&rdev->consumer_list);
2170         INIT_LIST_HEAD(&rdev->supply_list);
2171         INIT_LIST_HEAD(&rdev->list);
2172         INIT_LIST_HEAD(&rdev->slist);
2173         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2174
2175         /* preform any regulator specific init */
2176         if (init_data->regulator_init) {
2177                 ret = init_data->regulator_init(rdev->reg_data);
2178                 if (ret < 0)
2179                         goto clean;
2180         }
2181
2182         /* register with sysfs */
2183         rdev->dev.class = &regulator_class;
2184         rdev->dev.parent = dev;
2185         dev_set_name(&rdev->dev, "regulator.%d",
2186                      atomic_inc_return(&regulator_no) - 1);
2187         ret = device_register(&rdev->dev);
2188         if (ret != 0)
2189                 goto clean;
2190
2191         dev_set_drvdata(&rdev->dev, rdev);
2192
2193         /* set regulator constraints */
2194         ret = set_machine_constraints(rdev, &init_data->constraints);
2195         if (ret < 0)
2196                 goto scrub;
2197
2198         /* add attributes supported by this regulator */
2199         ret = add_regulator_attributes(rdev);
2200         if (ret < 0)
2201                 goto scrub;
2202
2203         /* set supply regulator if it exists */
2204         if (init_data->supply_regulator_dev) {
2205                 ret = set_supply(rdev,
2206                         dev_get_drvdata(init_data->supply_regulator_dev));
2207                 if (ret < 0)
2208                         goto scrub;
2209         }
2210
2211         /* add consumers devices */
2212         for (i = 0; i < init_data->num_consumer_supplies; i++) {
2213                 ret = set_consumer_device_supply(rdev,
2214                         init_data->consumer_supplies[i].dev,
2215                         init_data->consumer_supplies[i].dev_name,
2216                         init_data->consumer_supplies[i].supply);
2217                 if (ret < 0) {
2218                         for (--i; i >= 0; i--)
2219                                 unset_consumer_device_supply(rdev,
2220                                     init_data->consumer_supplies[i].dev_name,
2221                                     init_data->consumer_supplies[i].dev);
2222                         goto scrub;
2223                 }
2224         }
2225
2226         list_add(&rdev->list, &regulator_list);
2227 out:
2228         mutex_unlock(&regulator_list_mutex);
2229         return rdev;
2230
2231 scrub:
2232         device_unregister(&rdev->dev);
2233         /* device core frees rdev */
2234         rdev = ERR_PTR(ret);
2235         goto out;
2236
2237 clean:
2238         kfree(rdev);
2239         rdev = ERR_PTR(ret);
2240         goto out;
2241 }
2242 EXPORT_SYMBOL_GPL(regulator_register);
2243
2244 /**
2245  * regulator_unregister - unregister regulator
2246  * @rdev: regulator to unregister
2247  *
2248  * Called by regulator drivers to unregister a regulator.
2249  */
2250 void regulator_unregister(struct regulator_dev *rdev)
2251 {
2252         if (rdev == NULL)
2253                 return;
2254
2255         mutex_lock(&regulator_list_mutex);
2256         WARN_ON(rdev->open_count);
2257         unset_regulator_supplies(rdev);
2258         list_del(&rdev->list);
2259         if (rdev->supply)
2260                 sysfs_remove_link(&rdev->dev.kobj, "supply");
2261         device_unregister(&rdev->dev);
2262         mutex_unlock(&regulator_list_mutex);
2263 }
2264 EXPORT_SYMBOL_GPL(regulator_unregister);
2265
2266 /**
2267  * regulator_suspend_prepare - prepare regulators for system wide suspend
2268  * @state: system suspend state
2269  *
2270  * Configure each regulator with it's suspend operating parameters for state.
2271  * This will usually be called by machine suspend code prior to supending.
2272  */
2273 int regulator_suspend_prepare(suspend_state_t state)
2274 {
2275         struct regulator_dev *rdev;
2276         int ret = 0;
2277
2278         /* ON is handled by regulator active state */
2279         if (state == PM_SUSPEND_ON)
2280                 return -EINVAL;
2281
2282         mutex_lock(&regulator_list_mutex);
2283         list_for_each_entry(rdev, &regulator_list, list) {
2284
2285                 mutex_lock(&rdev->mutex);
2286                 ret = suspend_prepare(rdev, state);
2287                 mutex_unlock(&rdev->mutex);
2288
2289                 if (ret < 0) {
2290                         printk(KERN_ERR "%s: failed to prepare %s\n",
2291                                 __func__, rdev->desc->name);
2292                         goto out;
2293                 }
2294         }
2295 out:
2296         mutex_unlock(&regulator_list_mutex);
2297         return ret;
2298 }
2299 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2300
2301 /**
2302  * regulator_has_full_constraints - the system has fully specified constraints
2303  *
2304  * Calling this function will cause the regulator API to disable all
2305  * regulators which have a zero use count and don't have an always_on
2306  * constraint in a late_initcall.
2307  *
2308  * The intention is that this will become the default behaviour in a
2309  * future kernel release so users are encouraged to use this facility
2310  * now.
2311  */
2312 void regulator_has_full_constraints(void)
2313 {
2314         has_full_constraints = 1;
2315 }
2316 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
2317
2318 /**
2319  * rdev_get_drvdata - get rdev regulator driver data
2320  * @rdev: regulator
2321  *
2322  * Get rdev regulator driver private data. This call can be used in the
2323  * regulator driver context.
2324  */
2325 void *rdev_get_drvdata(struct regulator_dev *rdev)
2326 {
2327         return rdev->reg_data;
2328 }
2329 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2330
2331 /**
2332  * regulator_get_drvdata - get regulator driver data
2333  * @regulator: regulator
2334  *
2335  * Get regulator driver private data. This call can be used in the consumer
2336  * driver context when non API regulator specific functions need to be called.
2337  */
2338 void *regulator_get_drvdata(struct regulator *regulator)
2339 {
2340         return regulator->rdev->reg_data;
2341 }
2342 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2343
2344 /**
2345  * regulator_set_drvdata - set regulator driver data
2346  * @regulator: regulator
2347  * @data: data
2348  */
2349 void regulator_set_drvdata(struct regulator *regulator, void *data)
2350 {
2351         regulator->rdev->reg_data = data;
2352 }
2353 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2354
2355 /**
2356  * regulator_get_id - get regulator ID
2357  * @rdev: regulator
2358  */
2359 int rdev_get_id(struct regulator_dev *rdev)
2360 {
2361         return rdev->desc->id;
2362 }
2363 EXPORT_SYMBOL_GPL(rdev_get_id);
2364
2365 struct device *rdev_get_dev(struct regulator_dev *rdev)
2366 {
2367         return &rdev->dev;
2368 }
2369 EXPORT_SYMBOL_GPL(rdev_get_dev);
2370
2371 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2372 {
2373         return reg_init_data->driver_data;
2374 }
2375 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2376
2377 static int __init regulator_init(void)
2378 {
2379         printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
2380         return class_register(&regulator_class);
2381 }
2382
2383 /* init early to allow our consumers to complete system booting */
2384 core_initcall(regulator_init);
2385
2386 static int __init regulator_init_complete(void)
2387 {
2388         struct regulator_dev *rdev;
2389         struct regulator_ops *ops;
2390         struct regulation_constraints *c;
2391         int enabled, ret;
2392         const char *name;
2393
2394         mutex_lock(&regulator_list_mutex);
2395
2396         /* If we have a full configuration then disable any regulators
2397          * which are not in use or always_on.  This will become the
2398          * default behaviour in the future.
2399          */
2400         list_for_each_entry(rdev, &regulator_list, list) {
2401                 ops = rdev->desc->ops;
2402                 c = rdev->constraints;
2403
2404                 if (c->name)
2405                         name = c->name;
2406                 else if (rdev->desc->name)
2407                         name = rdev->desc->name;
2408                 else
2409                         name = "regulator";
2410
2411                 if (!ops->disable || c->always_on)
2412                         continue;
2413
2414                 mutex_lock(&rdev->mutex);
2415
2416                 if (rdev->use_count)
2417                         goto unlock;
2418
2419                 /* If we can't read the status assume it's on. */
2420                 if (ops->is_enabled)
2421                         enabled = ops->is_enabled(rdev);
2422                 else
2423                         enabled = 1;
2424
2425                 if (!enabled)
2426                         goto unlock;
2427
2428                 if (has_full_constraints) {
2429                         /* We log since this may kill the system if it
2430                          * goes wrong. */
2431                         printk(KERN_INFO "%s: disabling %s\n",
2432                                __func__, name);
2433                         ret = ops->disable(rdev);
2434                         if (ret != 0) {
2435                                 printk(KERN_ERR
2436                                        "%s: couldn't disable %s: %d\n",
2437                                        __func__, name, ret);
2438                         }
2439                 } else {
2440                         /* The intention is that in future we will
2441                          * assume that full constraints are provided
2442                          * so warn even if we aren't going to do
2443                          * anything here.
2444                          */
2445                         printk(KERN_WARNING
2446                                "%s: incomplete constraints, leaving %s on\n",
2447                                __func__, name);
2448                 }
2449
2450 unlock:
2451                 mutex_unlock(&rdev->mutex);
2452         }
2453
2454         mutex_unlock(&regulator_list_mutex);
2455
2456         return 0;
2457 }
2458 late_initcall(regulator_init_complete);