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