SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/regulator/core.c

   1 /*
   2  * core.c  --  Voltage/Current Regulator framework.
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  * Copyright 2008 SlimLogic Ltd.
   6  *
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/device.h>
  19 #include <linux/err.h>
  20 #include <linux/mutex.h>
  21 #include <linux/suspend.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/regulator/driver.h>
  24 #include <linux/regulator/machine.h>
  25
  26 #define REGULATOR_VERSION "0.5"
  27
  28 static DEFINE_MUTEX(regulator_list_mutex);
  29 static LIST_HEAD(regulator_list);
  30 static LIST_HEAD(regulator_map_list);
  31 static int has_full_constraints;
  32
  33 /*
  34  * struct regulator_map
  35  *
  36  * Used to provide symbolic supply names to devices.
  37  */
  38 struct regulator_map {
  39         struct list_head list;
  40         const char *dev_name;   /* The dev_name() for the consumer */
  41         const char *supply;
  42         struct regulator_dev *regulator;
  43 };
  44
  45 /*
  46  * struct regulator
  47  *
  48  * One for each consumer device.
  49  */
  50 struct regulator {
  51         struct device *dev;
  52         struct list_head list;
  53         int uA_load;
  54         int min_uV;
  55         int max_uV;
  56         char *supply_name;
  57         struct device_attribute dev_attr;
  58         struct regulator_dev *rdev;
  59 };
  60
  61 static int _regulator_is_enabled(struct regulator_dev *rdev);
  62 static int _regulator_disable(struct regulator_dev *rdev);
  63 static int _regulator_get_voltage(struct regulator_dev *rdev);
  64 static int _regulator_get_current_limit(struct regulator_dev *rdev);
  65 static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
  66 static void _notifier_call_chain(struct regulator_dev *rdev,
  67                                   unsigned long event, void *data);
  68
  69 /* gets the regulator for a given consumer device */
  70 static struct regulator *get_device_regulator(struct device *dev)
  71 {
  72         struct regulator *regulator = NULL;
  73         struct regulator_dev *rdev;
  74
  75         mutex_lock(&regulator_list_mutex);
  76         list_for_each_entry(rdev, &regulator_list, list) {
  77                 mutex_lock(&rdev->mutex);
  78                 list_for_each_entry(regulator, &rdev->consumer_list, list) {
  79                         if (regulator->dev == dev) {
  80                                 mutex_unlock(&rdev->mutex);
  81                                 mutex_unlock(&regulator_list_mutex);
  82                                 return regulator;
  83                         }
  84                 }
  85                 mutex_unlock(&rdev->mutex);
  86         }
  87         mutex_unlock(&regulator_list_mutex);
  88         return NULL;
  89 }
  90
  91 /* Platform voltage constraint check */
  92 static int regulator_check_voltage(struct regulator_dev *rdev,
  93                                    int *min_uV, int *max_uV)
  94 {
  95         BUG_ON(*min_uV > *max_uV);
  96
  97         if (!rdev->constraints) {
  98                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
  99                        rdev->desc->name);
 100                 return -ENODEV;
 101         }
 102         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
 103                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 104                        __func__, rdev->desc->name);
 105                 return -EPERM;
 106         }
 107
 108         if (*max_uV > rdev->constraints->max_uV)
 109                 *max_uV = rdev->constraints->max_uV;
 110         if (*min_uV < rdev->constraints->min_uV)
 111                 *min_uV = rdev->constraints->min_uV;
 112
 113         if (*min_uV > *max_uV)
 114                 return -EINVAL;
 115
 116         return 0;
 117 }
 118
 119 /* current constraint check */
 120 static int regulator_check_current_limit(struct regulator_dev *rdev,
 121                                         int *min_uA, int *max_uA)
 122 {
 123         BUG_ON(*min_uA > *max_uA);
 124
 125         if (!rdev->constraints) {
 126                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 127                        rdev->desc->name);
 128                 return -ENODEV;
 129         }
 130         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
 131                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 132                        __func__, rdev->desc->name);
 133                 return -EPERM;
 134         }
 135
 136         if (*max_uA > rdev->constraints->max_uA)
 137                 *max_uA = rdev->constraints->max_uA;
 138         if (*min_uA < rdev->constraints->min_uA)
 139                 *min_uA = rdev->constraints->min_uA;
 140
 141         if (*min_uA > *max_uA)
 142                 return -EINVAL;
 143
 144         return 0;
 145 }
 146
 147 /* operating mode constraint check */
 148 static int regulator_check_mode(struct regulator_dev *rdev, int mode)
 149 {
 150         switch (mode) {
 151         case REGULATOR_MODE_FAST:
 152         case REGULATOR_MODE_NORMAL:
 153         case REGULATOR_MODE_IDLE:
 154         case REGULATOR_MODE_STANDBY:
 155                 break;
 156         default:
 157                 return -EINVAL;
 158         }
 159
 160         if (!rdev->constraints) {
 161                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 162                        rdev->desc->name);
 163                 return -ENODEV;
 164         }
 165         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
 166                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 167                        __func__, rdev->desc->name);
 168                 return -EPERM;
 169         }
 170         if (!(rdev->constraints->valid_modes_mask & mode)) {
 171                 printk(KERN_ERR "%s: invalid mode %x for %s\n",
 172                        __func__, mode, rdev->desc->name);
 173                 return -EINVAL;
 174         }
 175         return 0;
 176 }
 177
 178 /* dynamic regulator mode switching constraint check */
 179 static int regulator_check_drms(struct regulator_dev *rdev)
 180 {
 181         if (!rdev->constraints) {
 182                 printk(KERN_ERR "%s: no constraints for %s\n", __func__,
 183                        rdev->desc->name);
 184                 return -ENODEV;
 185         }
 186         if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
 187                 printk(KERN_ERR "%s: operation not allowed for %s\n",
 188                        __func__, rdev->desc->name);
 189                 return -EPERM;
 190         }
 191         return 0;
 192 }
 193
 194 static ssize_t device_requested_uA_show(struct device *dev,
 195                              struct device_attribute *attr, char *buf)
 196 {
 197         struct regulator *regulator;
 198
 199         regulator = get_device_regulator(dev);
 200         if (regulator == NULL)
 201                 return 0;
 202
 203         return sprintf(buf, "%d\n", regulator->uA_load);
 204 }
 205
 206 static ssize_t regulator_uV_show(struct device *dev,
 207                                 struct device_attribute *attr, char *buf)
 208 {
 209         struct regulator_dev *rdev = dev_get_drvdata(dev);
 210         ssize_t ret;
 211
 212         mutex_lock(&rdev->mutex);
 213         ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
 214         mutex_unlock(&rdev->mutex);
 215
 216         return ret;
 217 }
 218 static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
 219
 220 static ssize_t regulator_uA_show(struct device *dev,
 221                                 struct device_attribute *attr, char *buf)
 222 {
 223         struct regulator_dev *rdev = dev_get_drvdata(dev);
 224
 225         return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
 226 }
 227 static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
 228
 229 static ssize_t regulator_name_show(struct device *dev,
 230                              struct device_attribute *attr, char *buf)
 231 {
 232         struct regulator_dev *rdev = dev_get_drvdata(dev);
 233         const char *name;
 234
 235         if (rdev->constraints && rdev->constraints->name)
 236                 name = rdev->constraints->name;
 237         else if (rdev->desc->name)
 238                 name = rdev->desc->name;
 239         else
 240                 name = "";
 241
 242         return sprintf(buf, "%s\n", name);
 243 }
 244
 245 static ssize_t regulator_print_opmode(char *buf, int mode)
 246 {
 247         switch (mode) {
 248         case REGULATOR_MODE_FAST:
 249                 return sprintf(buf, "fast\n");
 250         case REGULATOR_MODE_NORMAL:
 251                 return sprintf(buf, "normal\n");
 252         case REGULATOR_MODE_IDLE:
 253                 return sprintf(buf, "idle\n");
 254         case REGULATOR_MODE_STANDBY:
 255                 return sprintf(buf, "standby\n");
 256         }
 257         return sprintf(buf, "unknown\n");
 258 }
 259
 260 static ssize_t regulator_opmode_show(struct device *dev,
 261                                     struct device_attribute *attr, char *buf)
 262 {
 263         struct regulator_dev *rdev = dev_get_drvdata(dev);
 264
 265         return regulator_print_opmode(buf, _regulator_get_mode(rdev));
 266 }
 267 static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
 268
 269 static ssize_t regulator_print_state(char *buf, int state)
 270 {
 271         if (state > 0)
 272                 return sprintf(buf, "enabled\n");
 273         else if (state == 0)
 274                 return sprintf(buf, "disabled\n");
 275         else
 276                 return sprintf(buf, "unknown\n");
 277 }
 278
 279 static ssize_t regulator_state_show(struct device *dev,
 280                                    struct device_attribute *attr, char *buf)
 281 {
 282         struct regulator_dev *rdev = dev_get_drvdata(dev);
 283         ssize_t ret;
 284
 285         mutex_lock(&rdev->mutex);
 286         ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
 287         mutex_unlock(&rdev->mutex);
 288
 289         return ret;
 290 }
 291 static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
 292
 293 static ssize_t regulator_status_show(struct device *dev,
 294                                    struct device_attribute *attr, char *buf)
 295 {
 296         struct regulator_dev *rdev = dev_get_drvdata(dev);
 297         int status;
 298         char *label;
 299
 300         status = rdev->desc->ops->get_status(rdev);
 301         if (status < 0)
 302                 return status;
 303
 304         switch (status) {
 305         case REGULATOR_STATUS_OFF:
 306                 label = "off";
 307                 break;
 308         case REGULATOR_STATUS_ON:
 309                 label = "on";
 310                 break;
 311         case REGULATOR_STATUS_ERROR:
 312                 label = "error";
 313                 break;
 314         case REGULATOR_STATUS_FAST:
 315                 label = "fast";
 316                 break;
 317         case REGULATOR_STATUS_NORMAL:
 318                 label = "normal";
 319                 break;
 320         case REGULATOR_STATUS_IDLE:
 321                 label = "idle";
 322                 break;
 323         case REGULATOR_STATUS_STANDBY:
 324                 label = "standby";
 325                 break;
 326         default:
 327                 return -ERANGE;
 328         }
 329
 330         return sprintf(buf, "%s\n", label);
 331 }
 332 static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
 333
 334 static ssize_t regulator_min_uA_show(struct device *dev,
 335                                     struct device_attribute *attr, char *buf)
 336 {
 337         struct regulator_dev *rdev = dev_get_drvdata(dev);
 338
 339         if (!rdev->constraints)
 340                 return sprintf(buf, "constraint not defined\n");
 341
 342         return sprintf(buf, "%d\n", rdev->constraints->min_uA);
 343 }
 344 static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
 345
 346 static ssize_t regulator_max_uA_show(struct device *dev,
 347                                     struct device_attribute *attr, char *buf)
 348 {
 349         struct regulator_dev *rdev = dev_get_drvdata(dev);
 350
 351         if (!rdev->constraints)
 352                 return sprintf(buf, "constraint not defined\n");
 353
 354         return sprintf(buf, "%d\n", rdev->constraints->max_uA);
 355 }
 356 static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
 357
 358 static ssize_t regulator_min_uV_show(struct device *dev,
 359                                     struct device_attribute *attr, char *buf)
 360 {
 361         struct regulator_dev *rdev = dev_get_drvdata(dev);
 362
 363         if (!rdev->constraints)
 364                 return sprintf(buf, "constraint not defined\n");
 365
 366         return sprintf(buf, "%d\n", rdev->constraints->min_uV);
 367 }
 368 static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
 369
 370 static ssize_t regulator_max_uV_show(struct device *dev,
 371                                     struct device_attribute *attr, char *buf)
 372 {
 373         struct regulator_dev *rdev = dev_get_drvdata(dev);
 374
 375         if (!rdev->constraints)
 376                 return sprintf(buf, "constraint not defined\n");
 377
 378         return sprintf(buf, "%d\n", rdev->constraints->max_uV);
 379 }
 380 static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
 381
 382 static ssize_t regulator_total_uA_show(struct device *dev,
 383                                       struct device_attribute *attr, char *buf)
 384 {
 385         struct regulator_dev *rdev = dev_get_drvdata(dev);
 386         struct regulator *regulator;
 387         int uA = 0;
 388
 389         mutex_lock(&rdev->mutex);
 390         list_for_each_entry(regulator, &rdev->consumer_list, list)
 391             uA += regulator->uA_load;
 392         mutex_unlock(&rdev->mutex);
 393         return sprintf(buf, "%d\n", uA);
 394 }
 395 static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
 396
 397 static ssize_t regulator_num_users_show(struct device *dev,
 398                                       struct device_attribute *attr, char *buf)
 399 {
 400         struct regulator_dev *rdev = dev_get_drvdata(dev);
 401         return sprintf(buf, "%d\n", rdev->use_count);
 402 }
 403
 404 static ssize_t regulator_type_show(struct device *dev,
 405                                   struct device_attribute *attr, char *buf)
 406 {
 407         struct regulator_dev *rdev = dev_get_drvdata(dev);
 408
 409         switch (rdev->desc->type) {
 410         case REGULATOR_VOLTAGE:
 411                 return sprintf(buf, "voltage\n");
 412         case REGULATOR_CURRENT:
 413                 return sprintf(buf, "current\n");
 414         }
 415         return sprintf(buf, "unknown\n");
 416 }
 417
 418 static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
 419                                 struct device_attribute *attr, char *buf)
 420 {
 421         struct regulator_dev *rdev = dev_get_drvdata(dev);
 422
 423         return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
 424 }
 425 static DEVICE_ATTR(suspend_mem_microvolts, 0444,
 426                 regulator_suspend_mem_uV_show, NULL);
 427
 428 static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
 429                                 struct device_attribute *attr, char *buf)
 430 {
 431         struct regulator_dev *rdev = dev_get_drvdata(dev);
 432
 433         return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
 434 }
 435 static DEVICE_ATTR(suspend_disk_microvolts, 0444,
 436                 regulator_suspend_disk_uV_show, NULL);
 437
 438 static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
 439                                 struct device_attribute *attr, char *buf)
 440 {
 441         struct regulator_dev *rdev = dev_get_drvdata(dev);
 442
 443         return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
 444 }
 445 static DEVICE_ATTR(suspend_standby_microvolts, 0444,
 446                 regulator_suspend_standby_uV_show, NULL);
 447
 448 static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
 449                                 struct device_attribute *attr, char *buf)
 450 {
 451         struct regulator_dev *rdev = dev_get_drvdata(dev);
 452
 453         return regulator_print_opmode(buf,
 454                 rdev->constraints->state_mem.mode);
 455 }
 456 static DEVICE_ATTR(suspend_mem_mode, 0444,
 457                 regulator_suspend_mem_mode_show, NULL);
 458
 459 static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
 460                                 struct device_attribute *attr, char *buf)
 461 {
 462         struct regulator_dev *rdev = dev_get_drvdata(dev);
 463
 464         return regulator_print_opmode(buf,
 465                 rdev->constraints->state_disk.mode);
 466 }
 467 static DEVICE_ATTR(suspend_disk_mode, 0444,
 468                 regulator_suspend_disk_mode_show, NULL);
 469
 470 static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
 471                                 struct device_attribute *attr, char *buf)
 472 {
 473         struct regulator_dev *rdev = dev_get_drvdata(dev);
 474
 475         return regulator_print_opmode(buf,
 476                 rdev->constraints->state_standby.mode);
 477 }
 478 static DEVICE_ATTR(suspend_standby_mode, 0444,
 479                 regulator_suspend_standby_mode_show, NULL);
 480
 481 static ssize_t regulator_suspend_mem_state_show(struct device *dev,
 482                                    struct device_attribute *attr, char *buf)
 483 {
 484         struct regulator_dev *rdev = dev_get_drvdata(dev);
 485
 486         return regulator_print_state(buf,
 487                         rdev->constraints->state_mem.enabled);
 488 }
 489 static DEVICE_ATTR(suspend_mem_state, 0444,
 490                 regulator_suspend_mem_state_show, NULL);
 491
 492 static ssize_t regulator_suspend_disk_state_show(struct device *dev,
 493                                    struct device_attribute *attr, char *buf)
 494 {
 495         struct regulator_dev *rdev = dev_get_drvdata(dev);
 496
 497         return regulator_print_state(buf,
 498                         rdev->constraints->state_disk.enabled);
 499 }
 500 static DEVICE_ATTR(suspend_disk_state, 0444,
 501                 regulator_suspend_disk_state_show, NULL);
 502
 503 static ssize_t regulator_suspend_standby_state_show(struct device *dev,
 504                                    struct device_attribute *attr, char *buf)
 505 {
 506         struct regulator_dev *rdev = dev_get_drvdata(dev);
 507
 508         return regulator_print_state(buf,
 509                         rdev->constraints->state_standby.enabled);
 510 }
 511 static DEVICE_ATTR(suspend_standby_state, 0444,
 512                 regulator_suspend_standby_state_show, NULL);
 513
 514
 515 /*
 516  * These are the only attributes are present for all regulators.
 517  * Other attributes are a function of regulator functionality.
 518  */
 519 static struct device_attribute regulator_dev_attrs[] = {
 520         __ATTR(name, 0444, regulator_name_show, NULL),
 521         __ATTR(num_users, 0444, regulator_num_users_show, NULL),
 522         __ATTR(type, 0444, regulator_type_show, NULL),
 523         __ATTR_NULL,
 524 };
 525
 526 static void regulator_dev_release(struct device *dev)
 527 {
 528         struct regulator_dev *rdev = dev_get_drvdata(dev);
 529         kfree(rdev);
 530 }
 531
 532 static struct class regulator_class = {
 533         .name = "regulator",
 534         .dev_release = regulator_dev_release,
 535         .dev_attrs = regulator_dev_attrs,
 536 };
 537
 538 /* Calculate the new optimum regulator operating mode based on the new total
 539  * consumer load. All locks held by caller */
 540 static void drms_uA_update(struct regulator_dev *rdev)
 541 {
 542         struct regulator *sibling;
 543         int current_uA = 0, output_uV, input_uV, err;
 544         unsigned int mode;
 545
 546         err = regulator_check_drms(rdev);
 547         if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
 548             !rdev->desc->ops->get_voltage || !rdev->desc->ops->set_mode)
 549                 return;
 550
 551         /* get output voltage */
 552         output_uV = rdev->desc->ops->get_voltage(rdev);
 553         if (output_uV <= 0)
 554                 return;
 555
 556         /* get input voltage */
 557         if (rdev->supply && rdev->supply->desc->ops->get_voltage)
 558                 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
 559         else
 560                 input_uV = rdev->constraints->input_uV;
 561         if (input_uV <= 0)
 562                 return;
 563
 564         /* calc total requested load */
 565         list_for_each_entry(sibling, &rdev->consumer_list, list)
 566             current_uA += sibling->uA_load;
 567
 568         /* now get the optimum mode for our new total regulator load */
 569         mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
 570                                                   output_uV, current_uA);
 571
 572         /* check the new mode is allowed */
 573         err = regulator_check_mode(rdev, mode);
 574         if (err == 0)
 575                 rdev->desc->ops->set_mode(rdev, mode);
 576 }
 577
 578 static int suspend_set_state(struct regulator_dev *rdev,
 579         struct regulator_state *rstate)
 580 {
 581         int ret = 0;
 582
 583         /* enable & disable are mandatory for suspend control */
 584         if (!rdev->desc->ops->set_suspend_enable ||
 585                 !rdev->desc->ops->set_suspend_disable) {
 586                 printk(KERN_ERR "%s: no way to set suspend state\n",
 587                         __func__);
 588                 return -EINVAL;
 589         }
 590
 591         if (rstate->enabled)
 592                 ret = rdev->desc->ops->set_suspend_enable(rdev);
 593         else
 594                 ret = rdev->desc->ops->set_suspend_disable(rdev);
 595         if (ret < 0) {
 596                 printk(KERN_ERR "%s: failed to enabled/disable\n", __func__);
 597                 return ret;
 598         }
 599
 600         if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
 601                 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
 602                 if (ret < 0) {
 603                         printk(KERN_ERR "%s: failed to set voltage\n",
 604                                 __func__);
 605                         return ret;
 606                 }
 607         }
 608
 609         if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
 610                 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
 611                 if (ret < 0) {
 612                         printk(KERN_ERR "%s: failed to set mode\n", __func__);
 613                         return ret;
 614                 }
 615         }
 616         return ret;
 617 }
 618
 619 /* locks held by caller */
 620 static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
 621 {
 622         if (!rdev->constraints)
 623                 return -EINVAL;
 624
 625         switch (state) {
 626         case PM_SUSPEND_STANDBY:
 627                 return suspend_set_state(rdev,
 628                         &rdev->constraints->state_standby);
 629         case PM_SUSPEND_MEM:
 630                 return suspend_set_state(rdev,
 631                         &rdev->constraints->state_mem);
 632         case PM_SUSPEND_MAX:
 633                 return suspend_set_state(rdev,
 634                         &rdev->constraints->state_disk);
 635         default:
 636                 return -EINVAL;
 637         }
 638 }
 639
 640 static void print_constraints(struct regulator_dev *rdev)
 641 {
 642         struct regulation_constraints *constraints = rdev->constraints;
 643         char buf[80];
 644         int count;
 645
 646         if (rdev->desc->type == REGULATOR_VOLTAGE) {
 647                 if (constraints->min_uV == constraints->max_uV)
 648                         count = sprintf(buf, "%d mV ",
 649                                         constraints->min_uV / 1000);
 650                 else
 651                         count = sprintf(buf, "%d <--> %d mV ",
 652                                         constraints->min_uV / 1000,
 653                                         constraints->max_uV / 1000);
 654         } else {
 655                 if (constraints->min_uA == constraints->max_uA)
 656                         count = sprintf(buf, "%d mA ",
 657                                         constraints->min_uA / 1000);
 658                 else
 659                         count = sprintf(buf, "%d <--> %d mA ",
 660                                         constraints->min_uA / 1000,
 661                                         constraints->max_uA / 1000);
 662         }
 663         if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
 664                 count += sprintf(buf + count, "fast ");
 665         if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
 666                 count += sprintf(buf + count, "normal ");
 667         if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
 668                 count += sprintf(buf + count, "idle ");
 669         if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
 670                 count += sprintf(buf + count, "standby");
 671
 672         printk(KERN_INFO "regulator: %s: %s\n", rdev->desc->name, buf);
 673 }
 674
 675 static int machine_constraints_voltage(struct regulator_dev *rdev,
 676         const char *name, struct regulation_constraints *constraints)
 677 {
 678         struct regulator_ops *ops = rdev->desc->ops;
 679         int ret;
 680
 681         /* do we need to apply the constraint voltage */
 682         if (rdev->constraints->apply_uV &&
 683                 rdev->constraints->min_uV == rdev->constraints->max_uV &&
 684                 ops->set_voltage) {
 685                 ret = ops->set_voltage(rdev,
 686                         rdev->constraints->min_uV, rdev->constraints->max_uV);
 687                         if (ret < 0) {
 688                                 printk(KERN_ERR "%s: failed to apply %duV constraint to %s\n",
 689                                        __func__,
 690                                        rdev->constraints->min_uV, name);
 691                                 rdev->constraints = NULL;
 692                                 return ret;
 693                         }
 694         }
 695
 696         /* constrain machine-level voltage specs to fit
 697          * the actual range supported by this regulator.
 698          */
 699         if (ops->list_voltage && rdev->desc->n_voltages) {
 700                 int     count = rdev->desc->n_voltages;
 701                 int     i;
 702                 int     min_uV = INT_MAX;
 703                 int     max_uV = INT_MIN;
 704                 int     cmin = constraints->min_uV;
 705                 int     cmax = constraints->max_uV;
 706
 707                 /* it's safe to autoconfigure fixed-voltage supplies
 708                    and the constraints are used by list_voltage. */
 709                 if (count == 1 && !cmin) {
 710                         cmin = 1;
 711                         cmax = INT_MAX;
 712                         constraints->min_uV = cmin;
 713                         constraints->max_uV = cmax;
 714                 }
 715
 716                 /* voltage constraints are optional */
 717                 if ((cmin == 0) && (cmax == 0))
 718                         return 0;
 719
 720                 /* else require explicit machine-level constraints */
 721                 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 722                         pr_err("%s: %s '%s' voltage constraints\n",
 723                                        __func__, "invalid", name);
 724                         return -EINVAL;
 725                 }
 726
 727                 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
 728                 for (i = 0; i < count; i++) {
 729                         int     value;
 730
 731                         value = ops->list_voltage(rdev, i);
 732                         if (value <= 0)
 733                                 continue;
 734
 735                         /* maybe adjust [min_uV..max_uV] */
 736                         if (value >= cmin && value < min_uV)
 737                                 min_uV = value;
 738                         if (value <= cmax && value > max_uV)
 739                                 max_uV = value;
 740                 }
 741
 742                 /* final: [min_uV..max_uV] valid iff constraints valid */
 743                 if (max_uV < min_uV) {
 744                         pr_err("%s: %s '%s' voltage constraints\n",
 745                                        __func__, "unsupportable", name);
 746                         return -EINVAL;
 747                 }
 748
 749                 /* use regulator's subset of machine constraints */
 750                 if (constraints->min_uV < min_uV) {
 751                         pr_debug("%s: override '%s' %s, %d -> %d\n",
 752                                        __func__, name, "min_uV",
 753                                         constraints->min_uV, min_uV);
 754                         constraints->min_uV = min_uV;
 755                 }
 756                 if (constraints->max_uV > max_uV) {
 757                         pr_debug("%s: override '%s' %s, %d -> %d\n",
 758                                        __func__, name, "max_uV",
 759                                         constraints->max_uV, max_uV);
 760                         constraints->max_uV = max_uV;
 761                 }
 762         }
 763
 764         return 0;
 765 }
 766
 767 /**
 768  * set_machine_constraints - sets regulator constraints
 769  * @rdev: regulator source
 770  * @constraints: constraints to apply
 771  *
 772  * Allows platform initialisation code to define and constrain
 773  * regulator circuits e.g. valid voltage/current ranges, etc.  NOTE:
 774  * Constraints *must* be set by platform code in order for some
 775  * regulator operations to proceed i.e. set_voltage, set_current_limit,
 776  * set_mode.
 777  */
 778 static int set_machine_constraints(struct regulator_dev *rdev,
 779         struct regulation_constraints *constraints)
 780 {
 781         int ret = 0;
 782         const char *name;
 783         struct regulator_ops *ops = rdev->desc->ops;
 784
 785         if (constraints->name)
 786                 name = constraints->name;
 787         else if (rdev->desc->name)
 788                 name = rdev->desc->name;
 789         else
 790                 name = "regulator";
 791
 792         rdev->constraints = constraints;
 793
 794         ret = machine_constraints_voltage(rdev, name, constraints);
 795         if (ret != 0)
 796                 goto out;
 797
 798         /* do we need to setup our suspend state */
 799         if (constraints->initial_state) {
 800                 ret = suspend_prepare(rdev, constraints->initial_state);
 801                 if (ret < 0) {
 802                         printk(KERN_ERR "%s: failed to set suspend state for %s\n",
 803                                __func__, name);
 804                         rdev->constraints = NULL;
 805                         goto out;
 806                 }
 807         }
 808
 809         if (constraints->initial_mode) {
 810                 if (!ops->set_mode) {
 811                         printk(KERN_ERR "%s: no set_mode operation for %s\n",
 812                                __func__, name);
 813                         ret = -EINVAL;
 814                         goto out;
 815                 }
 816
 817                 ret = ops->set_mode(rdev, constraints->initial_mode);
 818                 if (ret < 0) {
 819                         printk(KERN_ERR
 820                                "%s: failed to set initial mode for %s: %d\n",
 821                                __func__, name, ret);
 822                         goto out;
 823                 }
 824         }
 825
 826         /* If the constraints say the regulator should be on at this point
 827          * and we have control then make sure it is enabled.
 828          */
 829         if ((constraints->always_on || constraints->boot_on) && ops->enable) {
 830                 ret = ops->enable(rdev);
 831                 if (ret < 0) {
 832                         printk(KERN_ERR "%s: failed to enable %s\n",
 833                                __func__, name);
 834                         rdev->constraints = NULL;
 835                         goto out;
 836                 }
 837         }
 838
 839         print_constraints(rdev);
 840 out:
 841         return ret;
 842 }
 843
 844 /**
 845  * set_supply - set regulator supply regulator
 846  * @rdev: regulator name
 847  * @supply_rdev: supply regulator name
 848  *
 849  * Called by platform initialisation code to set the supply regulator for this
 850  * regulator. This ensures that a regulators supply will also be enabled by the
 851  * core if it's child is enabled.
 852  */
 853 static int set_supply(struct regulator_dev *rdev,
 854         struct regulator_dev *supply_rdev)
 855 {
 856         int err;
 857
 858         err = sysfs_create_link(&rdev->dev.kobj, &supply_rdev->dev.kobj,
 859                                 "supply");
 860         if (err) {
 861                 printk(KERN_ERR
 862                        "%s: could not add device link %s err %d\n",
 863                        __func__, supply_rdev->dev.kobj.name, err);
 864                        goto out;
 865         }
 866         rdev->supply = supply_rdev;
 867         list_add(&rdev->slist, &supply_rdev->supply_list);
 868 out:
 869         return err;
 870 }
 871
 872 /**
 873  * set_consumer_device_supply: Bind a regulator to a symbolic supply
 874  * @rdev:         regulator source
 875  * @consumer_dev: device the supply applies to
 876  * @consumer_dev_name: dev_name() string for device supply applies to
 877  * @supply:       symbolic name for supply
 878  *
 879  * Allows platform initialisation code to map physical regulator
 880  * sources to symbolic names for supplies for use by devices.  Devices
 881  * should use these symbolic names to request regulators, avoiding the
 882  * need to provide board-specific regulator names as platform data.
 883  *
 884  * Only one of consumer_dev and consumer_dev_name may be specified.
 885  */
 886 static int set_consumer_device_supply(struct regulator_dev *rdev,
 887         struct device *consumer_dev, const char *consumer_dev_name,
 888         const char *supply)
 889 {
 890         struct regulator_map *node;
 891         int has_dev;
 892
 893         if (consumer_dev && consumer_dev_name)
 894                 return -EINVAL;
 895
 896         if (!consumer_dev_name && consumer_dev)
 897                 consumer_dev_name = dev_name(consumer_dev);
 898
 899         if (supply == NULL)
 900                 return -EINVAL;
 901
 902         if (consumer_dev_name != NULL)
 903                 has_dev = 1;
 904         else
 905                 has_dev = 0;
 906
 907         list_for_each_entry(node, &regulator_map_list, list) {
 908                 if (consumer_dev_name != node->dev_name)
 909                         continue;
 910                 if (strcmp(node->supply, supply) != 0)
 911                         continue;
 912
 913                 dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
 914                                 dev_name(&node->regulator->dev),
 915                                 node->regulator->desc->name,
 916                                 supply,
 917                                 dev_name(&rdev->dev), rdev->desc->name);
 918                 return -EBUSY;
 919         }
 920
 921         node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
 922         if (node == NULL)
 923                 return -ENOMEM;
 924
 925         node->regulator = rdev;
 926         node->supply = supply;
 927
 928         if (has_dev) {
 929                 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
 930                 if (node->dev_name == NULL) {
 931                         kfree(node);
 932                         return -ENOMEM;
 933                 }
 934         }
 935
 936         list_add(&node->list, &regulator_map_list);
 937         return 0;
 938 }
 939
 940 static void unset_consumer_device_supply(struct regulator_dev *rdev,
 941         const char *consumer_dev_name, struct device *consumer_dev)
 942 {
 943         struct regulator_map *node, *n;
 944
 945         if (consumer_dev && !consumer_dev_name)
 946                 consumer_dev_name = dev_name(consumer_dev);
 947
 948         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 949                 if (rdev != node->regulator)
 950                         continue;
 951
 952                 if (consumer_dev_name && node->dev_name &&
 953                     strcmp(consumer_dev_name, node->dev_name))
 954                         continue;
 955
 956                 list_del(&node->list);
 957                 kfree(node->dev_name);
 958                 kfree(node);
 959                 return;
 960         }
 961 }
 962
 963 static void unset_regulator_supplies(struct regulator_dev *rdev)
 964 {
 965         struct regulator_map *node, *n;
 966
 967         list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 968                 if (rdev == node->regulator) {
 969                         list_del(&node->list);
 970                         kfree(node->dev_name);
 971                         kfree(node);
 972                         return;
 973                 }
 974         }
 975 }
 976
 977 #define REG_STR_SIZE    32
 978
 979 static struct regulator *create_regulator(struct regulator_dev *rdev,
 980                                           struct device *dev,
 981                                           const char *supply_name)
 982 {
 983         struct regulator *regulator;
 984         char buf[REG_STR_SIZE];
 985         int err, size;
 986
 987         regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
 988         if (regulator == NULL)
 989                 return NULL;
 990
 991         mutex_lock(&rdev->mutex);
 992         regulator->rdev = rdev;
 993         list_add(&regulator->list, &rdev->consumer_list);
 994
 995         if (dev) {
 996                 /* create a 'requested_microamps_name' sysfs entry */
 997                 size = scnprintf(buf, REG_STR_SIZE, "microamps_requested_%s",
 998                         supply_name);
 999                 if (size >= REG_STR_SIZE)
1000                         goto overflow_err;
1001
1002                 regulator->dev = dev;
1003                 regulator->dev_attr.attr.name = kstrdup(buf, GFP_KERNEL);
1004                 if (regulator->dev_attr.attr.name == NULL)
1005                         goto attr_name_err;
1006
1007                 regulator->dev_attr.attr.owner = THIS_MODULE;
1008                 regulator->dev_attr.attr.mode = 0444;
1009                 regulator->dev_attr.show = device_requested_uA_show;
1010                 err = device_create_file(dev, &regulator->dev_attr);
1011                 if (err < 0) {
1012                         printk(KERN_WARNING "%s: could not add regulator_dev"
1013                                 " load sysfs\n", __func__);
1014                         goto attr_name_err;
1015                 }
1016
1017                 /* also add a link to the device sysfs entry */
1018                 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1019                                  dev->kobj.name, supply_name);
1020                 if (size >= REG_STR_SIZE)
1021                         goto attr_err;
1022
1023                 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1024                 if (regulator->supply_name == NULL)
1025                         goto attr_err;
1026
1027                 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1028                                         buf);
1029                 if (err) {
1030                         printk(KERN_WARNING
1031                                "%s: could not add device link %s err %d\n",
1032                                __func__, dev->kobj.name, err);
1033                         device_remove_file(dev, &regulator->dev_attr);
1034                         goto link_name_err;
1035                 }
1036         }
1037         mutex_unlock(&rdev->mutex);
1038         return regulator;
1039 link_name_err:
1040         kfree(regulator->supply_name);
1041 attr_err:
1042         device_remove_file(regulator->dev, &regulator->dev_attr);
1043 attr_name_err:
1044         kfree(regulator->dev_attr.attr.name);
1045 overflow_err:
1046         list_del(&regulator->list);
1047         kfree(regulator);
1048         mutex_unlock(&rdev->mutex);
1049         return NULL;
1050 }
1051
1052 /* Internal regulator request function */
1053 static struct regulator *_regulator_get(struct device *dev, const char *id,
1054                                         int exclusive)
1055 {
1056         struct regulator_dev *rdev;
1057         struct regulator_map *map;
1058         struct regulator *regulator = ERR_PTR(-ENODEV);
1059         const char *devname = NULL;
1060         int ret;
1061
1062         if (id == NULL) {
1063                 printk(KERN_ERR "regulator: get() with no identifier\n");
1064                 return regulator;
1065         }
1066
1067         if (dev)
1068                 devname = dev_name(dev);
1069
1070         mutex_lock(&regulator_list_mutex);
1071
1072         list_for_each_entry(map, &regulator_map_list, list) {
1073                 /* If the mapping has a device set up it must match */
1074                 if (map->dev_name &&
1075                     (!devname || strcmp(map->dev_name, devname)))
1076                         continue;
1077
1078                 if (strcmp(map->supply, id) == 0) {
1079                         rdev = map->regulator;
1080                         goto found;
1081                 }
1082         }
1083         mutex_unlock(&regulator_list_mutex);
1084         return regulator;
1085
1086 found:
1087         if (rdev->exclusive) {
1088                 regulator = ERR_PTR(-EPERM);
1089                 goto out;
1090         }
1091
1092         if (exclusive && rdev->open_count) {
1093                 regulator = ERR_PTR(-EBUSY);
1094                 goto out;
1095         }
1096
1097         if (!try_module_get(rdev->owner))
1098                 goto out;
1099
1100         regulator = create_regulator(rdev, dev, id);
1101         if (regulator == NULL) {
1102                 regulator = ERR_PTR(-ENOMEM);
1103                 module_put(rdev->owner);
1104         }
1105
1106         rdev->open_count++;
1107         if (exclusive) {
1108                 rdev->exclusive = 1;
1109
1110                 ret = _regulator_is_enabled(rdev);
1111                 if (ret > 0)
1112                         rdev->use_count = 1;
1113                 else
1114                         rdev->use_count = 0;
1115         }
1116
1117 out:
1118         mutex_unlock(&regulator_list_mutex);
1119
1120         return regulator;
1121 }
1122
1123 /**
1124  * regulator_get - lookup and obtain a reference to a regulator.
1125  * @dev: device for regulator "consumer"
1126  * @id: Supply name or regulator ID.
1127  *
1128  * Returns a struct regulator corresponding to the regulator producer,
1129  * or IS_ERR() condition containing errno.
1130  *
1131  * Use of supply names configured via regulator_set_device_supply() is
1132  * strongly encouraged.  It is recommended that the supply name used
1133  * should match the name used for the supply and/or the relevant
1134  * device pins in the datasheet.
1135  */
1136 struct regulator *regulator_get(struct device *dev, const char *id)
1137 {
1138         return _regulator_get(dev, id, 0);
1139 }
1140 EXPORT_SYMBOL_GPL(regulator_get);
1141
1142 /**
1143  * regulator_get_exclusive - obtain exclusive access to a regulator.
1144  * @dev: device for regulator "consumer"
1145  * @id: Supply name or regulator ID.
1146  *
1147  * Returns a struct regulator corresponding to the regulator producer,
1148  * or IS_ERR() condition containing errno.  Other consumers will be
1149  * unable to obtain this reference is held and the use count for the
1150  * regulator will be initialised to reflect the current state of the
1151  * regulator.
1152  *
1153  * This is intended for use by consumers which cannot tolerate shared
1154  * use of the regulator such as those which need to force the
1155  * regulator off for correct operation of the hardware they are
1156  * controlling.
1157  *
1158  * Use of supply names configured via regulator_set_device_supply() is
1159  * strongly encouraged.  It is recommended that the supply name used
1160  * should match the name used for the supply and/or the relevant
1161  * device pins in the datasheet.
1162  */
1163 struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1164 {
1165         return _regulator_get(dev, id, 1);
1166 }
1167 EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1168
1169 /**
1170  * regulator_put - "free" the regulator source
1171  * @regulator: regulator source
1172  *
1173  * Note: drivers must ensure that all regulator_enable calls made on this
1174  * regulator source are balanced by regulator_disable calls prior to calling
1175  * this function.
1176  */
1177 void regulator_put(struct regulator *regulator)
1178 {
1179         struct regulator_dev *rdev;
1180
1181         if (regulator == NULL || IS_ERR(regulator))
1182                 return;
1183
1184         mutex_lock(&regulator_list_mutex);
1185         rdev = regulator->rdev;
1186
1187         /* remove any sysfs entries */
1188         if (regulator->dev) {
1189                 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
1190                 kfree(regulator->supply_name);
1191                 device_remove_file(regulator->dev, &regulator->dev_attr);
1192                 kfree(regulator->dev_attr.attr.name);
1193         }
1194         list_del(&regulator->list);
1195         kfree(regulator);
1196
1197         rdev->open_count--;
1198         rdev->exclusive = 0;
1199
1200         module_put(rdev->owner);
1201         mutex_unlock(&regulator_list_mutex);
1202 }
1203 EXPORT_SYMBOL_GPL(regulator_put);
1204
1205 static int _regulator_can_change_status(struct regulator_dev *rdev)
1206 {
1207         if (!rdev->constraints)
1208                 return 0;
1209
1210         if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
1211                 return 1;
1212         else
1213                 return 0;
1214 }
1215
1216 /* locks held by regulator_enable() */
1217 static int _regulator_enable(struct regulator_dev *rdev)
1218 {
1219         int ret;
1220
1221         /* do we need to enable the supply regulator first */
1222         if (rdev->supply) {
1223                 ret = _regulator_enable(rdev->supply);
1224                 if (ret < 0) {
1225                         printk(KERN_ERR "%s: failed to enable %s: %d\n",
1226                                __func__, rdev->desc->name, ret);
1227                         return ret;
1228                 }
1229         }
1230
1231         /* check voltage and requested load before enabling */
1232         if (rdev->constraints &&
1233             (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1234                 drms_uA_update(rdev);
1235
1236         if (rdev->use_count == 0) {
1237                 /* The regulator may on if it's not switchable or left on */
1238                 ret = _regulator_is_enabled(rdev);
1239                 if (ret == -EINVAL || ret == 0) {
1240                         if (!_regulator_can_change_status(rdev))
1241                                 return -EPERM;
1242
1243                         if (rdev->desc->ops->enable) {
1244                                 ret = rdev->desc->ops->enable(rdev);
1245                                 if (ret < 0)
1246                                         return ret;
1247                         } else {
1248                                 return -EINVAL;
1249                         }
1250                 } else if (ret < 0) {
1251                         printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n",
1252                                __func__, rdev->desc->name, ret);
1253                         return ret;
1254                 }
1255                 /* Fallthrough on positive return values - already enabled */
1256         }
1257
1258         rdev->use_count++;
1259
1260         return 0;
1261 }
1262
1263 /**
1264  * regulator_enable - enable regulator output
1265  * @regulator: regulator source
1266  *
1267  * Request that the regulator be enabled with the regulator output at
1268  * the predefined voltage or current value.  Calls to regulator_enable()
1269  * must be balanced with calls to regulator_disable().
1270  *
1271  * NOTE: the output value can be set by other drivers, boot loader or may be
1272  * hardwired in the regulator.
1273  */
1274 int regulator_enable(struct regulator *regulator)
1275 {
1276         struct regulator_dev *rdev = regulator->rdev;
1277         int ret = 0;
1278
1279         mutex_lock(&rdev->mutex);
1280         ret = _regulator_enable(rdev);
1281         mutex_unlock(&rdev->mutex);
1282         return ret;
1283 }
1284 EXPORT_SYMBOL_GPL(regulator_enable);
1285
1286 /* locks held by regulator_disable() */
1287 static int _regulator_disable(struct regulator_dev *rdev)
1288 {
1289         int ret = 0;
1290
1291         if (WARN(rdev->use_count <= 0,
1292                         "unbalanced disables for %s\n",
1293                         rdev->desc->name))
1294                 return -EIO;
1295
1296         /* are we the last user and permitted to disable ? */
1297         if (rdev->use_count == 1 &&
1298             (rdev->constraints && !rdev->constraints->always_on)) {
1299
1300                 /* we are last user */
1301                 if (_regulator_can_change_status(rdev) &&
1302                     rdev->desc->ops->disable) {
1303                         ret = rdev->desc->ops->disable(rdev);
1304                         if (ret < 0) {
1305                                 printk(KERN_ERR "%s: failed to disable %s\n",
1306                                        __func__, rdev->desc->name);
1307                                 return ret;
1308                         }
1309                 }
1310
1311                 /* decrease our supplies ref count and disable if required */
1312                 if (rdev->supply)
1313                         _regulator_disable(rdev->supply);
1314
1315                 rdev->use_count = 0;
1316         } else if (rdev->use_count > 1) {
1317
1318                 if (rdev->constraints &&
1319                         (rdev->constraints->valid_ops_mask &
1320                         REGULATOR_CHANGE_DRMS))
1321                         drms_uA_update(rdev);
1322
1323                 rdev->use_count--;
1324         }
1325         return ret;
1326 }
1327
1328 /**
1329  * regulator_disable - disable regulator output
1330  * @regulator: regulator source
1331  *
1332  * Disable the regulator output voltage or current.  Calls to
1333  * regulator_enable() must be balanced with calls to
1334  * regulator_disable().
1335  *
1336  * NOTE: this will only disable the regulator output if no other consumer
1337  * devices have it enabled, the regulator device supports disabling and
1338  * machine constraints permit this operation.
1339  */
1340 int regulator_disable(struct regulator *regulator)
1341 {
1342         struct regulator_dev *rdev = regulator->rdev;
1343         int ret = 0;
1344
1345         mutex_lock(&rdev->mutex);
1346         ret = _regulator_disable(rdev);
1347         mutex_unlock(&rdev->mutex);
1348         return ret;
1349 }
1350 EXPORT_SYMBOL_GPL(regulator_disable);
1351
1352 /* locks held by regulator_force_disable() */
1353 static int _regulator_force_disable(struct regulator_dev *rdev)
1354 {
1355         int ret = 0;
1356
1357         /* force disable */
1358         if (rdev->desc->ops->disable) {
1359                 /* ah well, who wants to live forever... */
1360                 ret = rdev->desc->ops->disable(rdev);
1361                 if (ret < 0) {
1362                         printk(KERN_ERR "%s: failed to force disable %s\n",
1363                                __func__, rdev->desc->name);
1364                         return ret;
1365                 }
1366                 /* notify other consumers that power has been forced off */
1367                 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
1368                         NULL);
1369         }
1370
1371         /* decrease our supplies ref count and disable if required */
1372         if (rdev->supply)
1373                 _regulator_disable(rdev->supply);
1374
1375         rdev->use_count = 0;
1376         return ret;
1377 }
1378
1379 /**
1380  * regulator_force_disable - force disable regulator output
1381  * @regulator: regulator source
1382  *
1383  * Forcibly disable the regulator output voltage or current.
1384  * NOTE: this *will* disable the regulator output even if other consumer
1385  * devices have it enabled. This should be used for situations when device
1386  * damage will likely occur if the regulator is not disabled (e.g. over temp).
1387  */
1388 int regulator_force_disable(struct regulator *regulator)
1389 {
1390         int ret;
1391
1392         mutex_lock(&regulator->rdev->mutex);
1393         regulator->uA_load = 0;
1394         ret = _regulator_force_disable(regulator->rdev);
1395         mutex_unlock(&regulator->rdev->mutex);
1396         return ret;
1397 }
1398 EXPORT_SYMBOL_GPL(regulator_force_disable);
1399
1400 static int _regulator_is_enabled(struct regulator_dev *rdev)
1401 {
1402         /* sanity check */
1403         if (!rdev->desc->ops->is_enabled)
1404                 return -EINVAL;
1405
1406         return rdev->desc->ops->is_enabled(rdev);
1407 }
1408
1409 /**
1410  * regulator_is_enabled - is the regulator output enabled
1411  * @regulator: regulator source
1412  *
1413  * Returns positive if the regulator driver backing the source/client
1414  * has requested that the device be enabled, zero if it hasn't, else a
1415  * negative errno code.
1416  *
1417  * Note that the device backing this regulator handle can have multiple
1418  * users, so it might be enabled even if regulator_enable() was never
1419  * called for this particular source.
1420  */
1421 int regulator_is_enabled(struct regulator *regulator)
1422 {
1423         int ret;
1424
1425         mutex_lock(&regulator->rdev->mutex);
1426         ret = _regulator_is_enabled(regulator->rdev);
1427         mutex_unlock(&regulator->rdev->mutex);
1428
1429         return ret;
1430 }
1431 EXPORT_SYMBOL_GPL(regulator_is_enabled);
1432
1433 /**
1434  * regulator_count_voltages - count regulator_list_voltage() selectors
1435  * @regulator: regulator source
1436  *
1437  * Returns number of selectors, or negative errno.  Selectors are
1438  * numbered starting at zero, and typically correspond to bitfields
1439  * in hardware registers.
1440  */
1441 int regulator_count_voltages(struct regulator *regulator)
1442 {
1443         struct regulator_dev    *rdev = regulator->rdev;
1444
1445         return rdev->desc->n_voltages ? : -EINVAL;
1446 }
1447 EXPORT_SYMBOL_GPL(regulator_count_voltages);
1448
1449 /**
1450  * regulator_list_voltage - enumerate supported voltages
1451  * @regulator: regulator source
1452  * @selector: identify voltage to list
1453  * Context: can sleep
1454  *
1455  * Returns a voltage that can be passed to @regulator_set_voltage(),
1456  * zero if this selector code can't be used on this sytem, or a
1457  * negative errno.
1458  */
1459 int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1460 {
1461         struct regulator_dev    *rdev = regulator->rdev;
1462         struct regulator_ops    *ops = rdev->desc->ops;
1463         int                     ret;
1464
1465         if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1466                 return -EINVAL;
1467
1468         mutex_lock(&rdev->mutex);
1469         ret = ops->list_voltage(rdev, selector);
1470         mutex_unlock(&rdev->mutex);
1471
1472         if (ret > 0) {
1473                 if (ret < rdev->constraints->min_uV)
1474                         ret = 0;
1475                 else if (ret > rdev->constraints->max_uV)
1476                         ret = 0;
1477         }
1478
1479         return ret;
1480 }
1481 EXPORT_SYMBOL_GPL(regulator_list_voltage);
1482
1483 /**
1484  * regulator_is_supported_voltage - check if a voltage range can be supported
1485  *
1486  * @regulator: Regulator to check.
1487  * @min_uV: Minimum required voltage in uV.
1488  * @max_uV: Maximum required voltage in uV.
1489  *
1490  * Returns a boolean or a negative error code.
1491  */
1492 int regulator_is_supported_voltage(struct regulator *regulator,
1493                                    int min_uV, int max_uV)
1494 {
1495         int i, voltages, ret;
1496
1497         ret = regulator_count_voltages(regulator);
1498         if (ret < 0)
1499                 return ret;
1500         voltages = ret;
1501
1502         for (i = 0; i < voltages; i++) {
1503                 ret = regulator_list_voltage(regulator, i);
1504
1505                 if (ret >= min_uV && ret <= max_uV)
1506                         return 1;
1507         }
1508
1509         return 0;
1510 }
1511
1512 /**
1513  * regulator_set_voltage - set regulator output voltage
1514  * @regulator: regulator source
1515  * @min_uV: Minimum required voltage in uV
1516  * @max_uV: Maximum acceptable voltage in uV
1517  *
1518  * Sets a voltage regulator to the desired output voltage. This can be set
1519  * during any regulator state. IOW, regulator can be disabled or enabled.
1520  *
1521  * If the regulator is enabled then the voltage will change to the new value
1522  * immediately otherwise if the regulator is disabled the regulator will
1523  * output at the new voltage when enabled.
1524  *
1525  * NOTE: If the regulator is shared between several devices then the lowest
1526  * request voltage that meets the system constraints will be used.
1527  * Regulator system constraints must be set for this regulator before
1528  * calling this function otherwise this call will fail.
1529  */
1530 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
1531 {
1532         struct regulator_dev *rdev = regulator->rdev;
1533         int ret;
1534
1535         mutex_lock(&rdev->mutex);
1536
1537         /* sanity check */
1538         if (!rdev->desc->ops->set_voltage) {
1539                 ret = -EINVAL;
1540                 goto out;
1541         }
1542
1543         /* constraints check */
1544         ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
1545         if (ret < 0)
1546                 goto out;
1547         regulator->min_uV = min_uV;
1548         regulator->max_uV = max_uV;
1549         ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV);
1550
1551 out:
1552         _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE, NULL);
1553         mutex_unlock(&rdev->mutex);
1554         return ret;
1555 }
1556 EXPORT_SYMBOL_GPL(regulator_set_voltage);
1557
1558 static int _regulator_get_voltage(struct regulator_dev *rdev)
1559 {
1560         /* sanity check */
1561         if (rdev->desc->ops->get_voltage)
1562                 return rdev->desc->ops->get_voltage(rdev);
1563         else
1564                 return -EINVAL;
1565 }
1566
1567 /**
1568  * regulator_get_voltage - get regulator output voltage
1569  * @regulator: regulator source
1570  *
1571  * This returns the current regulator voltage in uV.
1572  *
1573  * NOTE: If the regulator is disabled it will return the voltage value. This
1574  * function should not be used to determine regulator state.
1575  */
1576 int regulator_get_voltage(struct regulator *regulator)
1577 {
1578         int ret;
1579
1580         mutex_lock(&regulator->rdev->mutex);
1581
1582         ret = _regulator_get_voltage(regulator->rdev);
1583
1584         mutex_unlock(&regulator->rdev->mutex);
1585
1586         return ret;
1587 }
1588 EXPORT_SYMBOL_GPL(regulator_get_voltage);
1589
1590 /**
1591  * regulator_set_current_limit - set regulator output current limit
1592  * @regulator: regulator source
1593  * @min_uA: Minimuum supported current in uA
1594  * @max_uA: Maximum supported current in uA
1595  *
1596  * Sets current sink to the desired output current. This can be set during
1597  * any regulator state. IOW, regulator can be disabled or enabled.
1598  *
1599  * If the regulator is enabled then the current will change to the new value
1600  * immediately otherwise if the regulator is disabled the regulator will
1601  * output at the new current when enabled.
1602  *
1603  * NOTE: Regulator system constraints must be set for this regulator before
1604  * calling this function otherwise this call will fail.
1605  */
1606 int regulator_set_current_limit(struct regulator *regulator,
1607                                int min_uA, int max_uA)
1608 {
1609         struct regulator_dev *rdev = regulator->rdev;
1610         int ret;
1611
1612         mutex_lock(&rdev->mutex);
1613
1614         /* sanity check */
1615         if (!rdev->desc->ops->set_current_limit) {
1616                 ret = -EINVAL;
1617                 goto out;
1618         }
1619
1620         /* constraints check */
1621         ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
1622         if (ret < 0)
1623                 goto out;
1624
1625         ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
1626 out:
1627         mutex_unlock(&rdev->mutex);
1628         return ret;
1629 }
1630 EXPORT_SYMBOL_GPL(regulator_set_current_limit);
1631
1632 static int _regulator_get_current_limit(struct regulator_dev *rdev)
1633 {
1634         int ret;
1635
1636         mutex_lock(&rdev->mutex);
1637
1638         /* sanity check */
1639         if (!rdev->desc->ops->get_current_limit) {
1640                 ret = -EINVAL;
1641                 goto out;
1642         }
1643
1644         ret = rdev->desc->ops->get_current_limit(rdev);
1645 out:
1646         mutex_unlock(&rdev->mutex);
1647         return ret;
1648 }
1649
1650 /**
1651  * regulator_get_current_limit - get regulator output current
1652  * @regulator: regulator source
1653  *
1654  * This returns the current supplied by the specified current sink in uA.
1655  *
1656  * NOTE: If the regulator is disabled it will return the current value. This
1657  * function should not be used to determine regulator state.
1658  */
1659 int regulator_get_current_limit(struct regulator *regulator)
1660 {
1661         return _regulator_get_current_limit(regulator->rdev);
1662 }
1663 EXPORT_SYMBOL_GPL(regulator_get_current_limit);
1664
1665 /**
1666  * regulator_set_mode - set regulator operating mode
1667  * @regulator: regulator source
1668  * @mode: operating mode - one of the REGULATOR_MODE constants
1669  *
1670  * Set regulator operating mode to increase regulator efficiency or improve
1671  * regulation performance.
1672  *
1673  * NOTE: Regulator system constraints must be set for this regulator before
1674  * calling this function otherwise this call will fail.
1675  */
1676 int regulator_set_mode(struct regulator *regulator, unsigned int mode)
1677 {
1678         struct regulator_dev *rdev = regulator->rdev;
1679         int ret;
1680
1681         mutex_lock(&rdev->mutex);
1682
1683         /* sanity check */
1684         if (!rdev->desc->ops->set_mode) {
1685                 ret = -EINVAL;
1686                 goto out;
1687         }
1688
1689         /* constraints check */
1690         ret = regulator_check_mode(rdev, mode);
1691         if (ret < 0)
1692                 goto out;
1693
1694         ret = rdev->desc->ops->set_mode(rdev, mode);
1695 out:
1696         mutex_unlock(&rdev->mutex);
1697         return ret;
1698 }
1699 EXPORT_SYMBOL_GPL(regulator_set_mode);
1700
1701 static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
1702 {
1703         int ret;
1704
1705         mutex_lock(&rdev->mutex);
1706
1707         /* sanity check */
1708         if (!rdev->desc->ops->get_mode) {
1709                 ret = -EINVAL;
1710                 goto out;
1711         }
1712
1713         ret = rdev->desc->ops->get_mode(rdev);
1714 out:
1715         mutex_unlock(&rdev->mutex);
1716         return ret;
1717 }
1718
1719 /**
1720  * regulator_get_mode - get regulator operating mode
1721  * @regulator: regulator source
1722  *
1723  * Get the current regulator operating mode.
1724  */
1725 unsigned int regulator_get_mode(struct regulator *regulator)
1726 {
1727         return _regulator_get_mode(regulator->rdev);
1728 }
1729 EXPORT_SYMBOL_GPL(regulator_get_mode);
1730
1731 /**
1732  * regulator_set_optimum_mode - set regulator optimum operating mode
1733  * @regulator: regulator source
1734  * @uA_load: load current
1735  *
1736  * Notifies the regulator core of a new device load. This is then used by
1737  * DRMS (if enabled by constraints) to set the most efficient regulator
1738  * operating mode for the new regulator loading.
1739  *
1740  * Consumer devices notify their supply regulator of the maximum power
1741  * they will require (can be taken from device datasheet in the power
1742  * consumption tables) when they change operational status and hence power
1743  * state. Examples of operational state changes that can affect power
1744  * consumption are :-
1745  *
1746  *    o Device is opened / closed.
1747  *    o Device I/O is about to begin or has just finished.
1748  *    o Device is idling in between work.
1749  *
1750  * This information is also exported via sysfs to userspace.
1751  *
1752  * DRMS will sum the total requested load on the regulator and change
1753  * to the most efficient operating mode if platform constraints allow.
1754  *
1755  * Returns the new regulator mode or error.
1756  */
1757 int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
1758 {
1759         struct regulator_dev *rdev = regulator->rdev;
1760         struct regulator *consumer;
1761         int ret, output_uV, input_uV, total_uA_load = 0;
1762         unsigned int mode;
1763
1764         mutex_lock(&rdev->mutex);
1765
1766         regulator->uA_load = uA_load;
1767         ret = regulator_check_drms(rdev);
1768         if (ret < 0)
1769                 goto out;
1770         ret = -EINVAL;
1771
1772         /* sanity check */
1773         if (!rdev->desc->ops->get_optimum_mode)
1774                 goto out;
1775
1776         /* get output voltage */
1777         output_uV = rdev->desc->ops->get_voltage(rdev);
1778         if (output_uV <= 0) {
1779                 printk(KERN_ERR "%s: invalid output voltage found for %s\n",
1780                         __func__, rdev->desc->name);
1781                 goto out;
1782         }
1783
1784         /* get input voltage */
1785         if (rdev->supply && rdev->supply->desc->ops->get_voltage)
1786                 input_uV = rdev->supply->desc->ops->get_voltage(rdev->supply);
1787         else
1788                 input_uV = rdev->constraints->input_uV;
1789         if (input_uV <= 0) {
1790                 printk(KERN_ERR "%s: invalid input voltage found for %s\n",
1791                         __func__, rdev->desc->name);
1792                 goto out;
1793         }
1794
1795         /* calc total requested load for this regulator */
1796         list_for_each_entry(consumer, &rdev->consumer_list, list)
1797             total_uA_load += consumer->uA_load;
1798
1799         mode = rdev->desc->ops->get_optimum_mode(rdev,
1800                                                  input_uV, output_uV,
1801                                                  total_uA_load);
1802         ret = regulator_check_mode(rdev, mode);
1803         if (ret < 0) {
1804                 printk(KERN_ERR "%s: failed to get optimum mode for %s @"
1805                         " %d uA %d -> %d uV\n", __func__, rdev->desc->name,
1806                         total_uA_load, input_uV, output_uV);
1807                 goto out;
1808         }
1809
1810         ret = rdev->desc->ops->set_mode(rdev, mode);
1811         if (ret < 0) {
1812                 printk(KERN_ERR "%s: failed to set optimum mode %x for %s\n",
1813                         __func__, mode, rdev->desc->name);
1814                 goto out;
1815         }
1816         ret = mode;
1817 out:
1818         mutex_unlock(&rdev->mutex);
1819         return ret;
1820 }
1821 EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
1822
1823 /**
1824  * regulator_register_notifier - register regulator event notifier
1825  * @regulator: regulator source
1826  * @nb: notifier block
1827  *
1828  * Register notifier block to receive regulator events.
1829  */
1830 int regulator_register_notifier(struct regulator *regulator,
1831                               struct notifier_block *nb)
1832 {
1833         return blocking_notifier_chain_register(&regulator->rdev->notifier,
1834                                                 nb);
1835 }
1836 EXPORT_SYMBOL_GPL(regulator_register_notifier);
1837
1838 /**
1839  * regulator_unregister_notifier - unregister regulator event notifier
1840  * @regulator: regulator source
1841  * @nb: notifier block
1842  *
1843  * Unregister regulator event notifier block.
1844  */
1845 int regulator_unregister_notifier(struct regulator *regulator,
1846                                 struct notifier_block *nb)
1847 {
1848         return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
1849                                                   nb);
1850 }
1851 EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
1852
1853 /* notify regulator consumers and downstream regulator consumers.
1854  * Note mutex must be held by caller.
1855  */
1856 static void _notifier_call_chain(struct regulator_dev *rdev,
1857                                   unsigned long event, void *data)
1858 {
1859         struct regulator_dev *_rdev;
1860
1861         /* call rdev chain first */
1862         blocking_notifier_call_chain(&rdev->notifier, event, NULL);
1863
1864         /* now notify regulator we supply */
1865         list_for_each_entry(_rdev, &rdev->supply_list, slist) {
1866           mutex_lock(&_rdev->mutex);
1867           _notifier_call_chain(_rdev, event, data);
1868           mutex_unlock(&_rdev->mutex);
1869         }
1870 }
1871
1872 /**
1873  * regulator_bulk_get - get multiple regulator consumers
1874  *
1875  * @dev:           Device to supply
1876  * @num_consumers: Number of consumers to register
1877  * @consumers:     Configuration of consumers; clients are stored here.
1878  *
1879  * @return 0 on success, an errno on failure.
1880  *
1881  * This helper function allows drivers to get several regulator
1882  * consumers in one operation.  If any of the regulators cannot be
1883  * acquired then any regulators that were allocated will be freed
1884  * before returning to the caller.
1885  */
1886 int regulator_bulk_get(struct device *dev, int num_consumers,
1887                        struct regulator_bulk_data *consumers)
1888 {
1889         int i;
1890         int ret;
1891
1892         for (i = 0; i < num_consumers; i++)
1893                 consumers[i].consumer = NULL;
1894
1895         for (i = 0; i < num_consumers; i++) {
1896                 consumers[i].consumer = regulator_get(dev,
1897                                                       consumers[i].supply);
1898                 if (IS_ERR(consumers[i].consumer)) {
1899                         ret = PTR_ERR(consumers[i].consumer);
1900                         dev_err(dev, "Failed to get supply '%s': %d\n",
1901                                 consumers[i].supply, ret);
1902                         consumers[i].consumer = NULL;
1903                         goto err;
1904                 }
1905         }
1906
1907         return 0;
1908
1909 err:
1910         for (i = 0; i < num_consumers && consumers[i].consumer; i++)
1911                 regulator_put(consumers[i].consumer);
1912
1913         return ret;
1914 }
1915 EXPORT_SYMBOL_GPL(regulator_bulk_get);
1916
1917 /**
1918  * regulator_bulk_enable - enable multiple regulator consumers
1919  *
1920  * @num_consumers: Number of consumers
1921  * @consumers:     Consumer data; clients are stored here.
1922  * @return         0 on success, an errno on failure
1923  *
1924  * This convenience API allows consumers to enable multiple regulator
1925  * clients in a single API call.  If any consumers cannot be enabled
1926  * then any others that were enabled will be disabled again prior to
1927  * return.
1928  */
1929 int regulator_bulk_enable(int num_consumers,
1930                           struct regulator_bulk_data *consumers)
1931 {
1932         int i;
1933         int ret;
1934
1935         for (i = 0; i < num_consumers; i++) {
1936                 ret = regulator_enable(consumers[i].consumer);
1937                 if (ret != 0)
1938                         goto err;
1939         }
1940
1941         return 0;
1942
1943 err:
1944         printk(KERN_ERR "Failed to enable %s: %d\n", consumers[i].supply, ret);
1945         for (i = 0; i < num_consumers; i++)
1946                 regulator_disable(consumers[i].consumer);
1947
1948         return ret;
1949 }
1950 EXPORT_SYMBOL_GPL(regulator_bulk_enable);
1951
1952 /**
1953  * regulator_bulk_disable - disable multiple regulator consumers
1954  *
1955  * @num_consumers: Number of consumers
1956  * @consumers:     Consumer data; clients are stored here.
1957  * @return         0 on success, an errno on failure
1958  *
1959  * This convenience API allows consumers to disable multiple regulator
1960  * clients in a single API call.  If any consumers cannot be enabled
1961  * then any others that were disabled will be disabled again prior to
1962  * return.
1963  */
1964 int regulator_bulk_disable(int num_consumers,
1965                            struct regulator_bulk_data *consumers)
1966 {
1967         int i;
1968         int ret;
1969
1970         for (i = 0; i < num_consumers; i++) {
1971                 ret = regulator_disable(consumers[i].consumer);
1972                 if (ret != 0)
1973                         goto err;
1974         }
1975
1976         return 0;
1977
1978 err:
1979         printk(KERN_ERR "Failed to disable %s: %d\n", consumers[i].supply,
1980                ret);
1981         for (i = 0; i < num_consumers; i++)
1982                 regulator_enable(consumers[i].consumer);
1983
1984         return ret;
1985 }
1986 EXPORT_SYMBOL_GPL(regulator_bulk_disable);
1987
1988 /**
1989  * regulator_bulk_free - free multiple regulator consumers
1990  *
1991  * @num_consumers: Number of consumers
1992  * @consumers:     Consumer data; clients are stored here.
1993  *
1994  * This convenience API allows consumers to free multiple regulator
1995  * clients in a single API call.
1996  */
1997 void regulator_bulk_free(int num_consumers,
1998                          struct regulator_bulk_data *consumers)
1999 {
2000         int i;
2001
2002         for (i = 0; i < num_consumers; i++) {
2003                 regulator_put(consumers[i].consumer);
2004                 consumers[i].consumer = NULL;
2005         }
2006 }
2007 EXPORT_SYMBOL_GPL(regulator_bulk_free);
2008
2009 /**
2010  * regulator_notifier_call_chain - call regulator event notifier
2011  * @rdev: regulator source
2012  * @event: notifier block
2013  * @data: callback-specific data.
2014  *
2015  * Called by regulator drivers to notify clients a regulator event has
2016  * occurred. We also notify regulator clients downstream.
2017  * Note lock must be held by caller.
2018  */
2019 int regulator_notifier_call_chain(struct regulator_dev *rdev,
2020                                   unsigned long event, void *data)
2021 {
2022         _notifier_call_chain(rdev, event, data);
2023         return NOTIFY_DONE;
2024
2025 }
2026 EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2027
2028 /**
2029  * regulator_mode_to_status - convert a regulator mode into a status
2030  *
2031  * @mode: Mode to convert
2032  *
2033  * Convert a regulator mode into a status.
2034  */
2035 int regulator_mode_to_status(unsigned int mode)
2036 {
2037         switch (mode) {
2038         case REGULATOR_MODE_FAST:
2039                 return REGULATOR_STATUS_FAST;
2040         case REGULATOR_MODE_NORMAL:
2041                 return REGULATOR_STATUS_NORMAL;
2042         case REGULATOR_MODE_IDLE:
2043                 return REGULATOR_STATUS_IDLE;
2044         case REGULATOR_STATUS_STANDBY:
2045                 return REGULATOR_STATUS_STANDBY;
2046         default:
2047                 return 0;
2048         }
2049 }
2050 EXPORT_SYMBOL_GPL(regulator_mode_to_status);
2051
2052 /*
2053  * To avoid cluttering sysfs (and memory) with useless state, only
2054  * create attributes that can be meaningfully displayed.
2055  */
2056 static int add_regulator_attributes(struct regulator_dev *rdev)
2057 {
2058         struct device           *dev = &rdev->dev;
2059         struct regulator_ops    *ops = rdev->desc->ops;
2060         int                     status = 0;
2061
2062         /* some attributes need specific methods to be displayed */
2063         if (ops->get_voltage) {
2064                 status = device_create_file(dev, &dev_attr_microvolts);
2065                 if (status < 0)
2066                         return status;
2067         }
2068         if (ops->get_current_limit) {
2069                 status = device_create_file(dev, &dev_attr_microamps);
2070                 if (status < 0)
2071                         return status;
2072         }
2073         if (ops->get_mode) {
2074                 status = device_create_file(dev, &dev_attr_opmode);
2075                 if (status < 0)
2076                         return status;
2077         }
2078         if (ops->is_enabled) {
2079                 status = device_create_file(dev, &dev_attr_state);
2080                 if (status < 0)
2081                         return status;
2082         }
2083         if (ops->get_status) {
2084                 status = device_create_file(dev, &dev_attr_status);
2085                 if (status < 0)
2086                         return status;
2087         }
2088
2089         /* some attributes are type-specific */
2090         if (rdev->desc->type == REGULATOR_CURRENT) {
2091                 status = device_create_file(dev, &dev_attr_requested_microamps);
2092                 if (status < 0)
2093                         return status;
2094         }
2095
2096         /* all the other attributes exist to support constraints;
2097          * don't show them if there are no constraints, or if the
2098          * relevant supporting methods are missing.
2099          */
2100         if (!rdev->constraints)
2101                 return status;
2102
2103         /* constraints need specific supporting methods */
2104         if (ops->set_voltage) {
2105                 status = device_create_file(dev, &dev_attr_min_microvolts);
2106                 if (status < 0)
2107                         return status;
2108                 status = device_create_file(dev, &dev_attr_max_microvolts);
2109                 if (status < 0)
2110                         return status;
2111         }
2112         if (ops->set_current_limit) {
2113                 status = device_create_file(dev, &dev_attr_min_microamps);
2114                 if (status < 0)
2115                         return status;
2116                 status = device_create_file(dev, &dev_attr_max_microamps);
2117                 if (status < 0)
2118                         return status;
2119         }
2120
2121         /* suspend mode constraints need multiple supporting methods */
2122         if (!(ops->set_suspend_enable && ops->set_suspend_disable))
2123                 return status;
2124
2125         status = device_create_file(dev, &dev_attr_suspend_standby_state);
2126         if (status < 0)
2127                 return status;
2128         status = device_create_file(dev, &dev_attr_suspend_mem_state);
2129         if (status < 0)
2130                 return status;
2131         status = device_create_file(dev, &dev_attr_suspend_disk_state);
2132         if (status < 0)
2133                 return status;
2134
2135         if (ops->set_suspend_voltage) {
2136                 status = device_create_file(dev,
2137                                 &dev_attr_suspend_standby_microvolts);
2138                 if (status < 0)
2139                         return status;
2140                 status = device_create_file(dev,
2141                                 &dev_attr_suspend_mem_microvolts);
2142                 if (status < 0)
2143                         return status;
2144                 status = device_create_file(dev,
2145                                 &dev_attr_suspend_disk_microvolts);
2146                 if (status < 0)
2147                         return status;
2148         }
2149
2150         if (ops->set_suspend_mode) {
2151                 status = device_create_file(dev,
2152                                 &dev_attr_suspend_standby_mode);
2153                 if (status < 0)
2154                         return status;
2155                 status = device_create_file(dev,
2156                                 &dev_attr_suspend_mem_mode);
2157                 if (status < 0)
2158                         return status;
2159                 status = device_create_file(dev,
2160                                 &dev_attr_suspend_disk_mode);
2161                 if (status < 0)
2162                         return status;
2163         }
2164
2165         return status;
2166 }
2167
2168 /**
2169  * regulator_register - register regulator
2170  * @regulator_desc: regulator to register
2171  * @dev: struct device for the regulator
2172  * @init_data: platform provided init data, passed through by driver
2173  * @driver_data: private regulator data
2174  *
2175  * Called by regulator drivers to register a regulator.
2176  * Returns 0 on success.
2177  */
2178 struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
2179         struct device *dev, struct regulator_init_data *init_data,
2180         void *driver_data)
2181 {
2182         static atomic_t regulator_no = ATOMIC_INIT(0);
2183         struct regulator_dev *rdev;
2184         int ret, i;
2185
2186         if (regulator_desc == NULL)
2187                 return ERR_PTR(-EINVAL);
2188
2189         if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
2190                 return ERR_PTR(-EINVAL);
2191
2192         if (regulator_desc->type != REGULATOR_VOLTAGE &&
2193             regulator_desc->type != REGULATOR_CURRENT)
2194                 return ERR_PTR(-EINVAL);
2195
2196         if (!init_data)
2197                 return ERR_PTR(-EINVAL);
2198
2199         rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
2200         if (rdev == NULL)
2201                 return ERR_PTR(-ENOMEM);
2202
2203         mutex_lock(&regulator_list_mutex);
2204
2205         mutex_init(&rdev->mutex);
2206         rdev->reg_data = driver_data;
2207         rdev->owner = regulator_desc->owner;
2208         rdev->desc = regulator_desc;
2209         INIT_LIST_HEAD(&rdev->consumer_list);
2210         INIT_LIST_HEAD(&rdev->supply_list);
2211         INIT_LIST_HEAD(&rdev->list);
2212         INIT_LIST_HEAD(&rdev->slist);
2213         BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
2214
2215         /* preform any regulator specific init */
2216         if (init_data->regulator_init) {
2217                 ret = init_data->regulator_init(rdev->reg_data);
2218                 if (ret < 0)
2219                         goto clean;
2220         }
2221
2222         /* register with sysfs */
2223         rdev->dev.class = &regulator_class;
2224         rdev->dev.parent = dev;
2225         dev_set_name(&rdev->dev, "regulator.%d",
2226                      atomic_inc_return(&regulator_no) - 1);
2227         ret = device_register(&rdev->dev);
2228         if (ret != 0)
2229                 goto clean;
2230
2231         dev_set_drvdata(&rdev->dev, rdev);
2232
2233         /* set regulator constraints */
2234         ret = set_machine_constraints(rdev, &init_data->constraints);
2235         if (ret < 0)
2236                 goto scrub;
2237
2238         /* add attributes supported by this regulator */
2239         ret = add_regulator_attributes(rdev);
2240         if (ret < 0)
2241                 goto scrub;
2242
2243         /* set supply regulator if it exists */
2244         if (init_data->supply_regulator_dev) {
2245                 ret = set_supply(rdev,
2246                         dev_get_drvdata(init_data->supply_regulator_dev));
2247                 if (ret < 0)
2248                         goto scrub;
2249         }
2250
2251         /* add consumers devices */
2252         for (i = 0; i < init_data->num_consumer_supplies; i++) {
2253                 ret = set_consumer_device_supply(rdev,
2254                         init_data->consumer_supplies[i].dev,
2255                         init_data->consumer_supplies[i].dev_name,
2256                         init_data->consumer_supplies[i].supply);
2257                 if (ret < 0) {
2258                         for (--i; i >= 0; i--)
2259                                 unset_consumer_device_supply(rdev,
2260                                     init_data->consumer_supplies[i].dev_name,
2261                                     init_data->consumer_supplies[i].dev);
2262                         goto scrub;
2263                 }
2264         }
2265
2266         list_add(&rdev->list, &regulator_list);
2267 out:
2268         mutex_unlock(&regulator_list_mutex);
2269         return rdev;
2270
2271 scrub:
2272         device_unregister(&rdev->dev);
2273         /* device core frees rdev */
2274         rdev = ERR_PTR(ret);
2275         goto out;
2276
2277 clean:
2278         kfree(rdev);
2279         rdev = ERR_PTR(ret);
2280         goto out;
2281 }
2282 EXPORT_SYMBOL_GPL(regulator_register);
2283
2284 /**
2285  * regulator_unregister - unregister regulator
2286  * @rdev: regulator to unregister
2287  *
2288  * Called by regulator drivers to unregister a regulator.
2289  */
2290 void regulator_unregister(struct regulator_dev *rdev)
2291 {
2292         if (rdev == NULL)
2293                 return;
2294
2295         mutex_lock(&regulator_list_mutex);
2296         WARN_ON(rdev->open_count);
2297         unset_regulator_supplies(rdev);
2298         list_del(&rdev->list);
2299         if (rdev->supply)
2300                 sysfs_remove_link(&rdev->dev.kobj, "supply");
2301         device_unregister(&rdev->dev);
2302         mutex_unlock(&regulator_list_mutex);
2303 }
2304 EXPORT_SYMBOL_GPL(regulator_unregister);
2305
2306 /**
2307  * regulator_suspend_prepare - prepare regulators for system wide suspend
2308  * @state: system suspend state
2309  *
2310  * Configure each regulator with it's suspend operating parameters for state.
2311  * This will usually be called by machine suspend code prior to supending.
2312  */
2313 int regulator_suspend_prepare(suspend_state_t state)
2314 {
2315         struct regulator_dev *rdev;
2316         int ret = 0;
2317
2318         /* ON is handled by regulator active state */
2319         if (state == PM_SUSPEND_ON)
2320                 return -EINVAL;
2321
2322         mutex_lock(&regulator_list_mutex);
2323         list_for_each_entry(rdev, &regulator_list, list) {
2324
2325                 mutex_lock(&rdev->mutex);
2326                 ret = suspend_prepare(rdev, state);
2327                 mutex_unlock(&rdev->mutex);
2328
2329                 if (ret < 0) {
2330                         printk(KERN_ERR "%s: failed to prepare %s\n",
2331                                 __func__, rdev->desc->name);
2332                         goto out;
2333                 }
2334         }
2335 out:
2336         mutex_unlock(&regulator_list_mutex);
2337         return ret;
2338 }
2339 EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
2340
2341 /**
2342  * regulator_has_full_constraints - the system has fully specified constraints
2343  *
2344  * Calling this function will cause the regulator API to disable all
2345  * regulators which have a zero use count and don't have an always_on
2346  * constraint in a late_initcall.
2347  *
2348  * The intention is that this will become the default behaviour in a
2349  * future kernel release so users are encouraged to use this facility
2350  * now.
2351  */
2352 void regulator_has_full_constraints(void)
2353 {
2354         has_full_constraints = 1;
2355 }
2356 EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
2357
2358 /**
2359  * rdev_get_drvdata - get rdev regulator driver data
2360  * @rdev: regulator
2361  *
2362  * Get rdev regulator driver private data. This call can be used in the
2363  * regulator driver context.
2364  */
2365 void *rdev_get_drvdata(struct regulator_dev *rdev)
2366 {
2367         return rdev->reg_data;
2368 }
2369 EXPORT_SYMBOL_GPL(rdev_get_drvdata);
2370
2371 /**
2372  * regulator_get_drvdata - get regulator driver data
2373  * @regulator: regulator
2374  *
2375  * Get regulator driver private data. This call can be used in the consumer
2376  * driver context when non API regulator specific functions need to be called.
2377  */
2378 void *regulator_get_drvdata(struct regulator *regulator)
2379 {
2380         return regulator->rdev->reg_data;
2381 }
2382 EXPORT_SYMBOL_GPL(regulator_get_drvdata);
2383
2384 /**
2385  * regulator_set_drvdata - set regulator driver data
2386  * @regulator: regulator
2387  * @data: data
2388  */
2389 void regulator_set_drvdata(struct regulator *regulator, void *data)
2390 {
2391         regulator->rdev->reg_data = data;
2392 }
2393 EXPORT_SYMBOL_GPL(regulator_set_drvdata);
2394
2395 /**
2396  * regulator_get_id - get regulator ID
2397  * @rdev: regulator
2398  */
2399 int rdev_get_id(struct regulator_dev *rdev)
2400 {
2401         return rdev->desc->id;
2402 }
2403 EXPORT_SYMBOL_GPL(rdev_get_id);
2404
2405 struct device *rdev_get_dev(struct regulator_dev *rdev)
2406 {
2407         return &rdev->dev;
2408 }
2409 EXPORT_SYMBOL_GPL(rdev_get_dev);
2410
2411 void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
2412 {
2413         return reg_init_data->driver_data;
2414 }
2415 EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
2416
2417 static int __init regulator_init(void)
2418 {
2419         printk(KERN_INFO "regulator: core version %s\n", REGULATOR_VERSION);
2420         return class_register(&regulator_class);
2421 }
2422
2423 /* init early to allow our consumers to complete system booting */
2424 core_initcall(regulator_init);
2425
2426 static int __init regulator_init_complete(void)
2427 {
2428         struct regulator_dev *rdev;
2429         struct regulator_ops *ops;
2430         struct regulation_constraints *c;
2431         int enabled, ret;
2432         const char *name;
2433
2434         mutex_lock(&regulator_list_mutex);
2435
2436         /* If we have a full configuration then disable any regulators
2437          * which are not in use or always_on.  This will become the
2438          * default behaviour in the future.
2439          */
2440         list_for_each_entry(rdev, &regulator_list, list) {
2441                 ops = rdev->desc->ops;
2442                 c = rdev->constraints;
2443
2444                 if (c && c->name)
2445                         name = c->name;
2446                 else if (rdev->desc->name)
2447                         name = rdev->desc->name;
2448                 else
2449                         name = "regulator";
2450
2451                 if (!ops->disable || (c && c->always_on))
2452                         continue;
2453
2454                 mutex_lock(&rdev->mutex);
2455
2456                 if (rdev->use_count)
2457                         goto unlock;
2458
2459                 /* If we can't read the status assume it's on. */
2460                 if (ops->is_enabled)
2461                         enabled = ops->is_enabled(rdev);
2462                 else
2463                         enabled = 1;
2464
2465                 if (!enabled)
2466                         goto unlock;
2467
2468                 if (has_full_constraints) {
2469                         /* We log since this may kill the system if it
2470                          * goes wrong. */
2471                         printk(KERN_INFO "%s: disabling %s\n",
2472                                __func__, name);
2473                         ret = ops->disable(rdev);
2474                         if (ret != 0) {
2475                                 printk(KERN_ERR
2476                                        "%s: couldn't disable %s: %d\n",
2477                                        __func__, name, ret);
2478                         }
2479                 } else {
2480                         /* The intention is that in future we will
2481                          * assume that full constraints are provided
2482                          * so warn even if we aren't going to do
2483                          * anything here.
2484                          */
2485                         printk(KERN_WARNING
2486                                "%s: incomplete constraints, leaving %s on\n",
2487                                __func__, name);
2488                 }
2489
2490 unlock:
2491                 mutex_unlock(&rdev->mutex);
2492         }
2493
2494         mutex_unlock(&regulator_list_mutex);
2495
2496         return 0;
2497 }
2498 late_initcall(regulator_init_complete);