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